diff --git a/project/jni/application/commandergenius/commandergenius b/project/jni/application/commandergenius/commandergenius index 1bcbadd1e..7c11c9533 160000 --- a/project/jni/application/commandergenius/commandergenius +++ b/project/jni/application/commandergenius/commandergenius @@ -1 +1 @@ -Subproject commit 1bcbadd1eadd735235288463239c348f5b58f845 +Subproject commit 7c11c95336a5d1b7fc4640b93e816c45428e61dd diff --git a/project/jni/png/ANNOUNCE b/project/jni/png/ANNOUNCE index b68c8db64..063cce6fa 100644 --- a/project/jni/png/ANNOUNCE +++ b/project/jni/png/ANNOUNCE @@ -1,58 +1,36 @@ -Libpng 1.4.6beta06 - January 23, 2011 +Libpng 1.6.6 - September 16, 2013 -This is not intended to be a public release. It will be replaced -within a few weeks by a public version or by another test version. +This is a public release of libpng, intended for use in production codes. Files available for download: Source files with LF line endings (for Unix/Linux) and with a "configure" script - 1.4.6beta06.tar.xz (LZMA-compressed, recommended) - 1.4.6beta06.tar.gz - 1.4.6beta06.tar.bz2 + libpng-1.6.6.tar.xz (LZMA-compressed, recommended) + libpng-1.6.6.tar.gz Source files with CRLF line endings (for Windows), without the "configure" script - lp146b06.7z (LZMA-compressed, recommended) - lp146b06.zip + lpng166.7z (LZMA-compressed, recommended) + lpng166.zip Other information: - 1.4.6beta06-README.txt - 1.4.6beta06-LICENSE.txt + libpng-1.6.6-README.txt + libpng-1.6.6-LICENSE.txt + Gnupg/*.asc (PGP armored detached signatures) -Changes since the last public release (1.4.5): +Changes since the last public release (1.6.5): -version 1.4.6beta01 [December 29, 2010] - Fixed bug in background transformation handling in pngrtran.c (it was - looking for the flag in png_ptr->transformations instead of in - png_ptr->flags) (David Raymond). + Removed two stray lines of code from arm/arm_init.c, again. -version 1.4.6beta02 [January 14, 2011] - Fixed misspelled macros in contrib/pngminim (Cosmin) - Updated CMakeLists.txt (Clifford Yapp) - -version 1.4.6beta03 [January 14, 2011] - Fixed some typecasts in png_debug statements (Cosmin). - -version 1.4.6beta04 [January 22, 2011] - Updated documentation of png_set|get_tRNS() (Thomas Klausner). - Added png_const_structp and png_const_infop types, and used them in - prototypes for most png_get_*() functions. - In the manual, describe the png_get_IHDR() arguments in the correct order. - -version 1.4.6beta05 [January 23, 2011] - Updated the synopses in the manual to reflect recent changes. - Fixed a typo in the *.def files and deleted entries that are now - declared in pngpriv.h - -version 1.4.6beta06 [January 23, 2011] - -Send comments/corrections/commendations to glennrp at users.sourceforge.net -or to png-mng-implement at lists.sf.net (subscription required; visit -https://lists.sourceforge.net/lists/listinfo/png-mng-implement). +Send comments/corrections/commendations to png-mng-implement at lists.sf.net +(subscription required; visit +https://lists.sourceforge.net/lists/listinfo/png-mng-implement +to subscribe) +or to glennrp at users.sourceforge.net Glenn R-P diff --git a/project/jni/png/CHANGES b/project/jni/png/CHANGES index 34bb1c209..cca2ae2ec 100644 --- a/project/jni/png/CHANGES +++ b/project/jni/png/CHANGES @@ -1,12 +1,11 @@ #if 0 -libpng_changes(){ /* CHANGES - changes for libpng -version 0.2 +Version 0.2 added reader into png.h fixed small problems in stub file -version 0.3 +Version 0.3 added pull reader split up pngwrite.c to several files added pnglib.txt @@ -15,9 +14,9 @@ version 0.3 fixed some bugs in writer interfaced with zlib 0.5 added K&R support - added check for 64 KB blocks for 16 bit machines + added check for 64 KB blocks for 16-bit machines -version 0.4 +Version 0.4 cleaned up code and commented code simplified time handling into png_time created png_color_16 and png_color_8 to handle color needs @@ -28,28 +27,28 @@ version 0.4 cleaned up zTXt reader and writer (using zlib's Reset functions) split transformations into pngrtran.c and pngwtran.c -version 0.5 +Version 0.5 interfaced with zlib 0.8 fixed many reading and writing bugs saved using 3 spaces instead of tabs -version 0.6 +Version 0.6 added png_large_malloc() and png_large_free() added png_size_t cleaned up some compiler warnings added png_start_read_image() -version 0.7 +Version 0.7 cleaned up lots of bugs finished dithering and other stuff added test program changed name from pnglib to libpng -version 0.71 [June, 1995] +Version 0.71 [June, 1995] changed pngtest.png for zlib 0.93 fixed error in libpng.txt and example.c -version 0.8 +Version 0.8 cleaned up some bugs added png_set_filler() split up pngstub.c into pngmem.c, pngio.c, and pngerror.c @@ -63,191 +62,196 @@ version 0.8 changed external functions passing floats to doubles (k&r problems?) put all the configurable stuff in pngconf.h enabled png_set_shift to work with paletted images on read - added png_read_update_info() - updates info structure with - transformations + added png_read_update_info() - updates info structure with transformations -version 0.81 [August, 1995] +Version 0.81 [August, 1995] incorporated Tim Wegner's medium model code (thanks, Tim) -version 0.82 [September, 1995] +Version 0.82 [September, 1995] [unspecified changes] -version 0.85 [December, 1995] +Version 0.85 [December, 1995] added more medium model code (almost everything's a far) added i/o, error, and memory callback functions - fixed some bugs (16 bit, 4 bit interlaced, etc.) + fixed some bugs (16-bit, 4-bit interlaced, etc.) added first run progressive reader (barely tested) -version 0.86 [January, 1996] +Version 0.86 [January, 1996] fixed bugs improved documentation -version 0.87 [January, 1996] +Version 0.87 [January, 1996] fixed medium model bugs fixed other bugs introduced in 0.85 and 0.86 added some minor documentation -version 0.88 [January, 1996] +Version 0.88 [January, 1996] fixed progressive bugs replaced tabs with spaces cleaned up documentation added callbacks for read/write and warning/error functions -version 0.89 [July, 1996] - added new initialization API to make libpng work better with shared libs - we now have png_create_read_struct(), png_create_write_struct(), - png_create_info_struct(), png_destroy_read_struct(), and - png_destroy_write_struct() instead of the separate calls to - malloc and png_read_init(), png_info_init(), and png_write_init() - changed warning/error callback functions to fix bug - this means you - should use the new initialization API if you were using the old - png_set_message_fn() calls, and that the old API no longer exists - so that people are aware that they need to change their code - changed filter selection API to allow selection of multiple filters - since it didn't work in previous versions of libpng anyways - optimized filter selection code - fixed png_set_background() to allow using an arbitrary RGB color for - paletted images - fixed gamma and background correction for paletted images, so - png_correct_palette is not needed unless you are correcting an - external palette (you will need to #define PNG_CORRECT_PALETTE_SUPPORTED - in pngconf.h) - if nobody uses this, it may disappear in the future. - fixed bug with Borland 64K memory allocation (Alexander Lehmann) - fixed bug in interlace handling (Smarasderagd, I think) - added more error checking for writing and image to reduce invalid files - separated read and write functions so that they won't both be linked - into a binary when only reading or writing functionality is used - new pngtest image also has interlacing and zTXt - updated documentation to reflect new API +Version 0.89 [July, 1996] + Added new initialization API to make libpng work better with shared libs + we now have png_create_read_struct(), png_create_write_struct(), + png_create_info_struct(), png_destroy_read_struct(), and + png_destroy_write_struct() instead of the separate calls to + malloc and png_read_init(), png_info_init(), and png_write_init() + Changed warning/error callback functions to fix bug - this means you + should use the new initialization API if you were using the old + png_set_message_fn() calls, and that the old API no longer exists + so that people are aware that they need to change their code + Changed filter selection API to allow selection of multiple filters + since it didn't work in previous versions of libpng anyways + Optimized filter selection code + Fixed png_set_background() to allow using an arbitrary RGB color for + paletted images + Fixed gamma and background correction for paletted images, so + png_correct_palette is not needed unless you are correcting an + external palette (you will need to #define PNG_CORRECT_PALETTE_SUPPORTED + in pngconf.h) - if nobody uses this, it may disappear in the future. + Fixed bug with Borland 64K memory allocation (Alexander Lehmann) + Fixed bug in interlace handling (Smarasderagd, I think) + Added more error checking for writing and image to reduce invalid files + Separated read and write functions so that they won't both be linked + into a binary when only reading or writing functionality is used + New pngtest image also has interlacing and zTXt + Updated documentation to reflect new API -version 0.90 [January, 1997] - made CRC errors/warnings on critical and ancillary chunks configurable +Version 0.90 [January, 1997] + Made CRC errors/warnings on critical and ancillary chunks configurable libpng will use the zlib CRC routines by (compile-time) default - changed DOS small/medium model memory support - needs zlib 1.04 (Tim Wegner) - added external C++ wrapper statements to png.h (Gilles Dauphin) - allow PNG file to be read when some or all of file signature has already - been read from the beginning of the stream. ****This affects the size - of info_struct and invalidates all programs that use a shared libpng**** - fixed png_filler() declarations - fixed? background color conversions - fixed order of error function pointers to match documentation - current chunk name is now available in png_struct to reduce the number - of nearly identical error messages (will simplify multi-lingual - support when available) - try to get ready for unknown-chunk callback functions: - - previously read critical chunks are flagged, so the chunk handling - routines can determine if the chunk is in the right place - - all chunk handling routines have the same prototypes, so we will - be able to handle all chunks via a callback mechanism - try to fix Linux "setjmp" buffer size problems - removed png_large_malloc, png_large_free, and png_realloc functions. + Changed DOS small/medium model memory support - needs zlib 1.04 (Tim Wegner) + Added external C++ wrapper statements to png.h (Gilles Dauphin) + Allow PNG file to be read when some or all of file signature has already + been read from the beginning of the stream. ****This affects the size + of info_struct and invalidates all programs that use a shared libpng**** + Fixed png_filler() declarations + Fixed? background color conversions + Fixed order of error function pointers to match documentation + Current chunk name is now available in png_struct to reduce the number + of nearly identical error messages (will simplify multi-lingual + support when available) + Try to get ready for unknown-chunk callback functions: + - previously read critical chunks are flagged, so the chunk handling + routines can determine if the chunk is in the right place + - all chunk handling routines have the same prototypes, so we will + be able to handle all chunks via a callback mechanism + Try to fix Linux "setjmp" buffer size problems + Removed png_large_malloc, png_large_free, and png_realloc functions. -version 0.95 [March, 1997] - fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never - fixed bug in PNG file signature compares when start != 0 - changed parameter type of png_set_filler(...filler...) from png_byte - to png_uint_32 - added test for MACOS to ensure that both math.h and fp.h are not #included - added macros for libpng to be compiled as a Windows DLL (Andreas Kupries) - added "packswap" transformation, which changes the endianness of - packed-pixel bytes (Kevin Bracey) - added "strip_alpha" transformation, which removes the alpha channel of - input images without using it (not necessarily a good idea) - added "swap_alpha" transformation, which puts the alpha channel in front - of the color bytes instead of after - removed all implicit variable tests which assume NULL == 0 (I think) - changed several variables to "png_size_t" to show 16/32-bit limitations - added new pCAL chunk read/write support - added experimental filter selection weighting (Greg Roelofs) - removed old png_set_rgbx() and png_set_xrgb() functions that have been +Version 0.95 [March, 1997] + Fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never + Fixed bug in PNG file signature compares when start != 0 + Changed parameter type of png_set_filler(...filler...) from png_byte + to png_uint_32 + Added test for MACOS to ensure that both math.h and fp.h are not #included + Added macros for libpng to be compiled as a Windows DLL (Andreas Kupries) + Added "packswap" transformation, which changes the endianness of + packed-pixel bytes (Kevin Bracey) + Added "strip_alpha" transformation, which removes the alpha channel of + input images without using it (not necessarily a good idea) + Added "swap_alpha" transformation, which puts the alpha channel in front + of the color bytes instead of after + Removed all implicit variable tests which assume NULL == 0 (I think) + Changed several variables to "png_size_t" to show 16/32-bit limitations + Added new pCAL chunk read/write support + Added experimental filter selection weighting (Greg Roelofs) + Removed old png_set_rgbx() and png_set_xrgb() functions that have been obsolete for about 2 years now (use png_set_filler() instead) - added macros to read 16- and 32-bit ints directly from buffer, to be - used only on those systems that support it (namely PowerPC and 680x0) - With some testing, this may become the default for MACOS/PPC systems. - only calculate CRC on data if we are going to use it - added macros for zTXt compression type PNG_zTXt_COMPRESSION_??? - added macros for simple libpng debugging output selectable at compile time - removed PNG_READ_END_MODE in progressive reader (Smarasderagd) - more description of info_struct in libpng.txt and png.h - more instructions in example.c - more chunk types tested in pngtest.c - renamed pngrcb.c to pngset.c, and all png_read_ functions to be - png_set_. We now have corresponding png_get_ - functions in pngget.c to get information in info_ptr. This isolates - the application from the internal organization of png_info_struct - (good for shared library implementations). + Added macros to read 16- and 32-bit ints directly from buffer, to be + used only on those systems that support it (namely PowerPC and 680x0) + With some testing, this may become the default for MACOS/PPC systems. + Only calculate CRC on data if we are going to use it + Added macros for zTXt compression type PNG_zTXt_COMPRESSION_??? + Added macros for simple libpng debugging output selectable at compile time + Removed PNG_READ_END_MODE in progressive reader (Smarasderagd) + More description of info_struct in libpng.txt and png.h + More instructions in example.c + More chunk types tested in pngtest.c + Renamed pngrcb.c to pngset.c, and all png_read_ functions to be + png_set_. We now have corresponding png_get_ + functions in pngget.c to get information in info_ptr. This isolates + the application from the internal organization of png_info_struct + (good for shared library implementations). -version 0.96 [May, 1997] - fixed serious bug with < 8bpp images introduced in 0.95 - fixed 256-color transparency bug (Greg Roelofs) - fixed up documentation (Greg Roelofs, Laszlo Nyul) - fixed "error" in pngconf.h for Linux setjmp() behaviour - fixed DOS medium model support (Tim Wegner) - fixed png_check_keyword() for case with error in static string text - added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul) - added typecasts to quiet compiler errors - added more debugging info +Version 0.96 [May, 1997] + Fixed serious bug with < 8bpp images introduced in 0.95 + Fixed 256-color transparency bug (Greg Roelofs) + Fixed up documentation (Greg Roelofs, Laszlo Nyul) + Fixed "error" in pngconf.h for Linux setjmp() behavior + Fixed DOS medium model support (Tim Wegner) + Fixed png_check_keyword() for case with error in static string text + Added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul) + Added typecasts to quiet compiler errors + Added more debugging info -version 0.97 [January, 1998] - removed PNG_USE_OWN_CRC capability - relocated png_set_crc_action from pngrutil.c to pngrtran.c - fixed typecasts of "new_key", etc. (Andreas Dilger) - added RFC 1152 [sic] date support - fixed bug in gamma handling of 4-bit grayscale - added 2-bit grayscale gamma handling (Glenn R-P) - added more typecasts. 65536L becomes (png_uint_32)65536L, etc. (Glenn R-P) - minor corrections in libpng.txt - added simple sRGB support (Glenn R-P) - easier conditional compiling, e.g. define PNG_READ/WRITE_NOT_FULLY_SUPPORTED; - all configurable options can be selected from command-line instead - of having to edit pngconf.h (Glenn R-P) - fixed memory leak in pngwrite.c (free info_ptr->text) (Glenn R-P) - added more conditions for png_do_background, to avoid changing - black pixels to background when a background is supplied and - no pixels are transparent - repaired PNG_NO_STDIO behaviour - tested NODIV support and made it default behaviour (Greg Roelofs) - added "-m" option and PNGTEST_DEBUG_MEMORY to pngtest (John Bowler) - regularized version numbering scheme and bumped shared-library major - version number to 2 to avoid problems with libpng 0.89 apps (Greg Roelofs) +Version 0.97 [January, 1998] + Removed PNG_USE_OWN_CRC capability + Relocated png_set_crc_action from pngrutil.c to pngrtran.c + Fixed typecasts of "new_key", etc. (Andreas Dilger) + Added RFC 1152 [sic] date support + Fixed bug in gamma handling of 4-bit grayscale + Added 2-bit grayscale gamma handling (Glenn R-P) + Added more typecasts. 65536L becomes (png_uint_32)65536L, etc. (Glenn R-P) + Minor corrections in libpng.txt + Added simple sRGB support (Glenn R-P) + Easier conditional compiling, e.g., + define PNG_READ/WRITE_NOT_FULLY_SUPPORTED; + all configurable options can be selected from command-line instead + of having to edit pngconf.h (Glenn R-P) + Fixed memory leak in pngwrite.c (free info_ptr->text) (Glenn R-P) + Added more conditions for png_do_background, to avoid changing + black pixels to background when a background is supplied and + no pixels are transparent + Repaired PNG_NO_STDIO behavior + Tested NODIV support and made it default behavior (Greg Roelofs) + Added "-m" option and PNGTEST_DEBUG_MEMORY to pngtest (John Bowler) + Regularized version numbering scheme and bumped shared-library major + version number to 2 to avoid problems with libpng 0.89 apps + (Greg Roelofs) -version 0.98 [January, 1998] - cleaned up some typos in libpng.txt and in code documentation - fixed memory leaks in pCAL chunk processing (Glenn R-P and John Bowler) - cosmetic change "display_gamma" to "screen_gamma" in pngrtran.c - changed recommendation about file_gamma for PC images to .51 from .45, - in example.c and libpng.txt, added comments to distinguish between - screen_gamma, viewing_gamma, and display_gamma. - changed all references to RFC1152 to read RFC1123 and changed the - PNG_TIME_RFC1152_SUPPORTED macro to PNG_TIME_RFC1123_SUPPORTED - added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent) - changed srgb_intent from png_byte to int to avoid compiler bugs +Version 0.98 [January, 1998] + Cleaned up some typos in libpng.txt and in code documentation + Fixed memory leaks in pCAL chunk processing (Glenn R-P and John Bowler) + Cosmetic change "display_gamma" to "screen_gamma" in pngrtran.c + Changed recommendation about file_gamma for PC images to .51 from .45, + in example.c and libpng.txt, added comments to distinguish between + screen_gamma, viewing_gamma, and display_gamma. + Changed all references to RFC1152 to read RFC1123 and changed the + PNG_TIME_RFC1152_SUPPORTED macro to PNG_TIME_RFC1123_SUPPORTED + Added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent) + Changed srgb_intent from png_byte to int to avoid compiler bugs -version 0.99 [January 30, 1998] - free info_ptr->text instead of end_info_ptr->text in pngread.c (John Bowler) - fixed a longstanding "packswap" bug in pngtrans.c - fixed some inconsistencies in pngconf.h that prevented compiling with - PNG_READ_GAMMA_SUPPORTED and PNG_READ_hIST_SUPPORTED undefined - fixed some typos and made other minor rearrangement of libpng.txt (Andreas) - changed recommendation about file_gamma for PC images to .50 from .51 in - example.c and libpng.txt, and changed file_gamma for sRGB images to .45 - added a number of functions to access information from the png structure - png_get_image_height(), etc. (Glenn R-P, suggestion by Brad Pettit) - added TARGET_MACOS similar to zlib-1.0.8 - define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined - added type casting to all png_malloc() function calls -version 0.99a [January 31, 1998] +Version 0.99 [January 30, 1998] + Free info_ptr->text instead of end_info_ptr->text in pngread.c (John Bowler) + Fixed a longstanding "packswap" bug in pngtrans.c + Fixed some inconsistencies in pngconf.h that prevented compiling with + PNG_READ_GAMMA_SUPPORTED and PNG_READ_hIST_SUPPORTED undefined + Fixed some typos and made other minor rearrangement of libpng.txt (Andreas) + Changed recommendation about file_gamma for PC images to .50 from .51 in + example.c and libpng.txt, and changed file_gamma for sRGB images to .45 + Added a number of functions to access information from the png structure + png_get_image_height(), etc. (Glenn R-P, suggestion by Brad Pettit) + Added TARGET_MACOS similar to zlib-1.0.8 + Define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined + Added type casting to all png_malloc() function calls + +Version 0.99a [January 31, 1998] Added type casts and parentheses to all returns that return a value.(Tim W.) -version 0.99b [February 4, 1998] + +Version 0.99b [February 4, 1998] Added type cast png_uint_32 on malloc function calls where needed. Changed type of num_hist from png_uint_32 to int (same as num_palette). Added checks for rowbytes overflow, in case png_size_t is less than 32 bits. Renamed makefile.elf to makefile.lnx. -version 0.99c [February 7, 1998] + +Version 0.99c [February 7, 1998] More type casting. Removed erroneous overflow test in pngmem.c. Added png_buffered_memcpy() and png_buffered_memset(), apply them to rowbytes. Added UNIX manual pages libpng.3 (incorporating libpng.txt) and png.5. -version 0.99d [February 11, 1998] + +Version 0.99d [February 11, 1998] Renamed "far_to_near()" "png_far_to_near()" Revised libpng.3 Version 99c "buffered" operations didn't work as intended. Replaced them @@ -257,7 +261,8 @@ version 0.99d [February 11, 1998] Check for overlength tRNS chunk present when indexed-color PLTE is read. Cleaned up spelling errors in libpng.3/libpng.txt Corrected a problem with png_get_tRNS() which returned undefined trans array -version 0.99e [February 28, 1998] + +Version 0.99e [February 28, 1998] Corrected png_get_tRNS() again. Add parentheses for easier reading of pngget.c, fixed "||" should be "&&". Touched up example.c to make more of it compileable, although the entire @@ -267,53 +272,59 @@ version 0.99e [February 28, 1998] Replaced pngtest.png with one created with zlib 1.1.1 Changed pngtest to report PASS even when file size is different (Jean-loup G.) Corrected some logic errors in png_do_invert_alpha() (Chris Patterson) -version 0.99f [March 5, 1998] + +Version 0.99f [March 5, 1998] Corrected a bug in pngpread() introduced in version 99c (Kevin Bracey) Moved makefiles into a "scripts" directory, and added INSTALL instruction file Added makefile.os2 and pngos2.def (A. Zabolotny) and makefile.s2x (W. Sebok) Added pointers to "note on libpng versions" in makefile.lnx and README Added row callback feature when reading and writing nonprogressive rows - and added a test of this feature in pngtest.c + and added a test of this feature in pngtest.c Added user transform callbacks, with test of the feature in pngtest.c -version 0.99g [March 6, 1998, morning] + +Version 0.99g [March 6, 1998, morning] Minor changes to pngtest.c to suppress compiler warnings. Removed "beta" language from documentation. -version 0.99h [March 6, 1998, evening] + +Version 0.99h [March 6, 1998, evening] Minor changes to previous minor changes to pngtest.c Changed PNG_READ_NOT_FULLY_SUPPORTED to PNG_READ_TRANSFORMS_NOT_SUPPORTED - and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro + and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro Added user transform capability -version 1.00 [March 7, 1998] +Version 1.00 [March 7, 1998] Changed several typedefs in pngrutil.c Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik) - replaced "while(1)" with "for(;;)" - added PNGARG() to prototypes in pngtest.c and removed some prototypes - updated some of the makefiles (Tom Lane) - changed some typedefs (s_start, etc.) in pngrutil.c - fixed dimensions of "short_months" array in pngwrite.c + Replaced "while(1)" with "for(;;)" + Added PNGARG() to prototypes in pngtest.c and removed some prototypes + Updated some of the makefiles (Tom Lane) + Changed some typedefs (s_start, etc.) in pngrutil.c + Fixed dimensions of "short_months" array in pngwrite.c Replaced ansi2knr.c with the one from jpeg-v6 -version 1.0.0 [March 8, 1998] +Version 1.0.0 [March 8, 1998] Changed name from 1.00 to 1.0.0 (Adam Costello) Added smakefile.ppc (with SCOPTIONS.ppc) for Amiga PPC (Andreas Kleinert) -version 1.0.0a [March 9, 1998] + +Version 1.0.0a [March 9, 1998] Fixed three bugs in pngrtran.c to make gamma+background handling consistent - (Greg Roelofs) + (Greg Roelofs) Changed format of the PNG_LIBPNG_VER integer to xyyzz instead of xyz - for major, minor, and bugfix releases. This is 10001. (Adam Costello, - Tom Lane) + for major, minor, and bugfix releases. This is 10001. (Adam Costello, + Tom Lane) Make months range from 1-12 in png_convert_to_rfc1123 -version 1.0.0b [March 13, 1998] + +Version 1.0.0b [March 13, 1998] Quieted compiler complaints about two empty "for" loops in pngrutil.c Minor changes to makefile.s2x Removed #ifdef/#endif around a png_free() in pngread.c -version 1.0.1 [March 14, 1998] +Version 1.0.1 [March 14, 1998] Changed makefile.s2x to reduce security risk of using a relative pathname Fixed some typos in the documentation (Greg). Fixed a problem with value of "channels" returned by png_read_update_info() -version 1.0.1a [April 21, 1998] + +Version 1.0.1a [April 21, 1998] Optimized Paeth calculations by replacing abs() function calls with intrinsics plus other loop optimizations. Improves avg decoding speed by about 20%. Commented out i386istic "align" compiler flags in makefile.lnx. @@ -327,19 +338,24 @@ version 1.0.1a [April 21, 1998] Moved a misplaced pngrutil code block that truncates tRNS if it has more than num_palette entries -- test was done before num_palette was defined. Fixed a png_convert_to_rfc1123() bug that converts day 31 to 0 (Steve Eddins). - Changed compiler flags in makefile.wat for better optimization (Pawel Mrochen). -version 1.0.1b [May 2, 1998] + Changed compiler flags in makefile.wat for better optimization + (Pawel Mrochen). + +Version 1.0.1b [May 2, 1998] Relocated png_do_gray_to_rgb() within png_do_read_transformations() (Greg). Relocated the png_composite macros from pngrtran.c to png.h (Greg). Added makefile.sco (contributed by Mike Hopkirk). Fixed two bugs (missing definitions of "istop") introduced in libpng-1.0.1a. Fixed a bug in pngrtran.c that would set channels=5 under some circumstances. - More work on the Paeth-filtering, achieving imperceptible speedup (A Kleinert). - More work on loop optimization which may help when compiled with C++ compilers. + More work on the Paeth-filtering, achieving imperceptible speedup + (A Kleinert). + More work on loop optimization which may help when compiled with C++ + compilers. Added warnings when people try to use transforms they've defined out. Collapsed 4 "i" and "c" loops into single "i" loops in pngrtran and pngwtran. Revised paragraph about png_set_expand() in libpng.txt and libpng.3 (Greg) -version 1.0.1c [May 11, 1998] + +Version 1.0.1c [May 11, 1998] Fixed a bug in pngrtran.c (introduced in libpng-1.0.1a) where the masks for filler bytes should have been 0xff instead of 0xf. Added max_pixel_depth=32 in pngrutil.c when using FILLER with palette images. @@ -351,7 +367,8 @@ version 1.0.1c [May 11, 1998] to remove unwanted capabilities via the compile line Made some corrections to grammar (which, it's) in documentation (Greg). Corrected example.c, use of row_pointers in png_write_image(). -version 1.0.1d [May 24, 1998] + +Version 1.0.1d [May 24, 1998] Corrected several statements that used side effects illegally in pngrutil.c and pngtrans.c, that were introduced in version 1.0.1b Revised png_read_rows() to avoid repeated if-testing for NULL (A Kleinert) @@ -361,7 +378,8 @@ version 1.0.1d [May 24, 1998] Bob Dellaca, to make a png32bd.dll with Borland C++ 4.5 Fixed error in example.c with png_set_text: num_text is 3, not 2 (Guido V.) Changed several loops from count-down to count-up, for consistency. -version 1.0.1e [June 6, 1998] + +Version 1.0.1e [June 6, 1998] Revised libpng.txt and libpng.3 description of png_set_read|write_fn(), and added warnings when people try to set png_read_fn and png_write_fn in the same structure. @@ -378,9 +396,10 @@ version 1.0.1e [June 6, 1998] PNGTEST_DEBUG_MEM feature. Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner). -version 1.0.2 [June 14, 1998] +Version 1.0.2 [June 14, 1998] Fixed two bugs in makefile.bor . -version 1.0.2a [December 30, 1998] + +Version 1.0.2a [December 30, 1998] Replaced and extended code that was removed from png_set_filler() in 1.0.1a. Fixed a bug in png_do_filler() that made it fail to write filler bytes in the left-most pixel of each row (Kevin Bracey). @@ -402,21 +421,24 @@ version 1.0.2a [December 30, 1998] Added png_get_copyright() and png_get_header_version() functions. Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c Added information about debugging in libpng.txt and libpng.3 . - Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco. + Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and + makefile.sco. Removed lines after Dynamic Dependencies" in makefile.aco . Revised makefile.dec to make a shared library (Jeremie Petit). Removed trailing blanks from all files. -version 1.0.2a [January 6, 1999] + +Version 1.0.2a [January 6, 1999] Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h Added "if" tests to silence complaints about unused png_ptr in png.h and png.c Changed "check_if_png" function in example.c to return true (nonzero) if PNG. Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig() which is obsolete. -version 1.0.3 [January 14, 1999] +Version 1.0.3 [January 14, 1999] Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice) Added a statement of Y2K compliance in png.h, libpng.3, and Y2KINFO. -version 1.0.3a [August 12, 1999] + +Version 1.0.3a [August 12, 1999] Added check for PNG_READ_INTERLACE_SUPPORTED in pngread.c; issue a warning if an attempt is made to read an interlaced image when it's not supported. Added check if png_ptr->trans is defined before freeing it in pngread.c @@ -443,13 +465,15 @@ version 1.0.3a [August 12, 1999] Correct gamma with srgb is 45455 instead of 45000 in pngrutil.c, to be consistent with PNG-1.2, and allow variance of 500 before complaining. Added assembler code contributed by Intel in file pngvcrd.c and modified - makefile.w32 to use it (Nirav Chhatrapati, INTEL Corporation, Gilles Vollant) + makefile.w32 to use it (Nirav Chhatrapati, INTEL Corporation, + Gilles Vollant) Changed "ln -s -f" to "ln -f -s" in the makefiles to make Solaris happy. Added some aliases for png_set_expand() in pngrtran.c, namely png_set_expand_PLTE(), png_set_expand_depth(), and png_set_expand_tRNS() (Greg Roelofs, in "PNG: The Definitive Guide"). Added makefile.beo for BEOS on X86, contributed by Sander Stok. -version 1.0.3b [August 26, 1999] + +Version 1.0.3b [August 26, 1999] Replaced 2147483647L several places with PNG_MAX_UINT macro, defined in png.h Changed leading blanks to tabs in all makefiles. Define PNG_USE_PNGVCRD in makefile.w32, to get MMX assembler code. @@ -461,12 +485,13 @@ version 1.0.3b [August 26, 1999] negative shift distance, whose results are undefined in the C language. Added a check in pngset.c to prevent writing multiple tIME chunks. Added a check in pngwrite.c to detect invalid small window_bits sizes. -version 1.0.3d [September 4, 1999] + +Version 1.0.3d [September 4, 1999] Fixed type casting of igamma in pngrutil.c Added new png_expand functions to scripts/pngdef.pas and pngos2.def Added a demo read_user_transform_fn that examines the row filters in pngtest.c -version 1.0.4 [September 24, 1999] +Version 1.0.4 [September 24, 1999] Define PNG_ALWAYS_EXTERN in pngconf.h if __STDC__ is defined Delete #define PNG_INTERNAL and include "png.h" from pngasmrd.h Made several minor corrections to pngtest.c @@ -480,24 +505,30 @@ version 1.0.4 [September 24, 1999] assembler code) and makefile.vcwin32 (doesn't). Added a CPU timing report to pngtest.c (enabled by defining PNGTEST_TIMING) Added a copy of pngnow.png to the distribution. -version 1.0.4a [September 25, 1999] + +Version 1.0.4a [September 25, 1999] Increase max_pixel_depth in pngrutil.c if a user transform needs it. Changed several division operations to right-shifts in pngvcrd.c -version 1.0.4b [September 30, 1999] + +Version 1.0.4b [September 30, 1999] Added parentheses in line 3732 of pngvcrd.c Added a comment in makefile.linux warning about buggy -O3 in pgcc 2.95.1 -version 1.0.4c [October 1, 1999] + +Version 1.0.4c [October 1, 1999] Added a "png_check_version" function in png.c and pngtest.c that will generate a helpful compiler error if an old png.h is found in the search path. Changed type of png_user_transform_depth|channels from int to png_byte. -version 1.0.4d [October 6, 1999] + +Version 1.0.4d [October 6, 1999] Changed 0.45 to 0.45455 in png_set_sRGB() Removed unused PLTE entries from pngnow.png Re-enabled some parts of pngvcrd.c (png_combine_row) that work properly. -version 1.0.4e [October 10, 1999] + +Version 1.0.4e [October 10, 1999] Fixed sign error in pngvcrd.c (Greg Roelofs) Replaced some instances of memcpy with simple assignments in pngvcrd (GR-P) -version 1.0.4f [October 15, 1999] + +Version 1.0.4f [October 15, 1999] Surrounded example.c code with #if 0 .. #endif to prevent people from inadvertently trying to compile it. Changed png_get_header_version() from a function to a macro in png.h @@ -505,9 +536,10 @@ version 1.0.4f [October 15, 1999] Removed some pointless "ptr = NULL" in pngmem.c Added a "contrib" directory containing the source code from Greg's book. -version 1.0.5 [October 15, 1999] +Version 1.0.5 [October 15, 1999] Minor editing of the INSTALL and README files. -version 1.0.5a [October 23, 1999] + +Version 1.0.5a [October 23, 1999] Added contrib/pngsuite and contrib/pngminus (Willem van Schaik) Fixed a typo in the png_set_sRGB() function call in example.c (Jan Nijtmans) Further optimization and bugfix of pngvcrd.c @@ -515,14 +547,16 @@ version 1.0.5a [October 23, 1999] text_ptr structure. Instead, it makes its own copy. Created separate write_end_info_struct in pngtest.c for a more severe test. Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak. -version 1.0.5b [November 23, 1999] + +Version 1.0.5b [November 23, 1999] Moved PNG_FLAG_HAVE_CHUNK_HEADER, PNG_FLAG_BACKGROUND_IS_GRAY and PNG_FLAG_WROTE_tIME from flags to mode. Added png_write_info_before_PLTE() function. Fixed some typecasting in contrib/gregbook/*.c Updated scripts/makevms.com and added makevms.com to contrib/gregbook and contrib/pngminus (Martin Zinser) -version 1.0.5c [November 26, 1999] + +Version 1.0.5c [November 26, 1999] Moved png_get_header_version from png.h to png.c, to accommodate ansi2knr. Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to accommodate making DLL's: Moved usr_png_ver from global variable to function @@ -535,7 +569,8 @@ version 1.0.5c [November 26, 1999] Removed some extraneous "-I" from contrib/pngminus/makefile.std Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2. Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3 -version 1.0.5d [November 29, 1999] + +Version 1.0.5d [November 29, 1999] Add type cast (png_const_charp) two places in png.c Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays. Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available @@ -543,7 +578,8 @@ version 1.0.5d [November 29, 1999] comment out (with #ifdef) all the new declarations when PNG_USE_GLOBAL_ARRAYS is defined. Added PNG_EXPORT_VAR macro to accommodate making DLL's. -version 1.0.5e [November 30, 1999] + +Version 1.0.5e [November 30, 1999] Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text structure; refactored the inflate/deflate support to make adding new chunks with trailing compressed parts easier in the future, and added new functions @@ -564,18 +600,21 @@ version 1.0.5e [November 30, 1999] PNG_cHNK_SUPPORTED and combined the three types of PNG_text_SUPPORTED macros, leaving the separate macros also available. Removed comments on #endifs at the end of many short, non-nested #if-blocks. -version 1.0.5f [December 6, 1999] + +Version 1.0.5f [December 6, 1999] Changed makefile.solaris to issue a warning about potential problems when the ucb "ld" is in the path ahead of the ccs "ld". Removed "- [date]" from the "synopsis" line in libpng.3 and libpngpf.3. Added sCAL chunk support (Eric S. Raymond). -version 1.0.5g [December 7, 1999] + +Version 1.0.5g [December 7, 1999] Fixed "png_free_spallettes" typo in png.h Added code to handle new chunks in pngpread.c Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block Added "translated_key" to png_text structure and png_write_iTXt(). Added code in pngwrite.c to work around a newly discovered zlib bug. -version 1.0.5h [December 10, 1999] + +Version 1.0.5h [December 10, 1999] NOTE: regarding the note for version 1.0.5e, the following must also be included in your code: png_text[i].translated_key = NULL; @@ -583,7 +622,8 @@ version 1.0.5h [December 10, 1999] Option to eliminate all floating point support was added. Some new fixed-point functions such as png_set_gAMA_fixed() were added. Expanded tabs and removed trailing blanks in source files. -version 1.0.5i [December 13, 1999] + +Version 1.0.5i [December 13, 1999] Added some type casts to silence compiler warnings. Renamed "png_free_spalette" to "png_free_spalettes" for consistency. Removed leading blanks from a #define in pngvcrd.c @@ -595,7 +635,8 @@ version 1.0.5i [December 13, 1999] Added png_free_hIST() function. Various patches to fix bugs in the sCAL and integer cHRM processing, and to add some convenience macros for use with sCAL. -version 1.0.5j [December 21, 1999] + +Version 1.0.5j [December 21, 1999] Changed "unit" parameter of png_write_sCAL from png_byte to int, to work around buggy compilers. Added new type "png_fixed_point" for integers that hold float*100000 values @@ -611,7 +652,8 @@ version 1.0.5j [December 21, 1999] and to write the iTXt chunk after IDAT if it appears in the end_ptr. Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs) Reversed the order of trying to write floating-point and fixed-point gAMA. -version 1.0.5k [December 27, 1999] + +Version 1.0.5k [December 27, 1999] Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))" Added png_handle_as_unknown() function (Glenn) Added png_free_chunk_list() function and chunk_list and num_chunk_list members @@ -622,33 +664,41 @@ version 1.0.5k [December 27, 1999] Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR). Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is. Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP(). -version 1.0.5l [January 1, 2000] + +Version 1.0.5l [January 1, 2000] Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr() for setting a callback function to handle unknown chunks and for retrieving the associated user pointer (Glenn). -version 1.0.5m [January 7, 2000] + +Version 1.0.5m [January 7, 2000] Added high-level functions png_read_png(), png_write_png(), png_free_pixels(). -version 1.0.5n [January 9, 2000] + +Version 1.0.5n [January 9, 2000] Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its own memory for info_ptr->palette. This makes it safe for the calling application to free its copy of the palette any time after it calls png_set_PLTE(). -version 1.0.5o [January 20, 2000] + +Version 1.0.5o [January 20, 2000] Cosmetic changes only (removed some trailing blanks and TABs) -version 1.0.5p [January 31, 2000] + +Version 1.0.5p [January 31, 2000] Renamed pngdll.mak to makefile.bd32 Cosmetic changes in pngtest.c -version 1.0.5q [February 5, 2000] + +Version 1.0.5q [February 5, 2000] Relocated the makefile.solaris warning about PATH problems. Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg) Revised makefile.gcmmx Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() macros -version 1.0.5r [February 7, 2000] + +Version 1.0.5r [February 7, 2000] Removed superfluous prototype for png_get_itxt from png.h Fixed a bug in pngrtran.c that improperly expanded the background color. Return *num_text=0 from png_get_text() when appropriate, and fix documentation of png_get_text() in libpng.txt/libpng.3. -version 1.0.5s [February 18, 2000] + +Version 1.0.5s [February 18, 2000] Added "png_jmp_env()" macro to pngconf.h, to help people migrate to the new error handler that's planned for the next libpng release, and changed example.c, pngtest.c, and contrib programs to use this macro. @@ -667,7 +717,8 @@ version 1.0.5s [February 18, 2000] Added png_set_rows() and png_get_rows(), for use with png_read|write_png(). Modified png_read_png() to allocate info_ptr->row_pointers only if it hasn't already been allocated. -version 1.0.5t [March 4, 2000] + +Version 1.0.5t [March 4, 2000] Changed png_jmp_env() migration aiding macro to png_jmpbuf(). Fixed "interlace" typo (should be "interlaced") in contrib/gregbook/read2-x.c Fixed bug with use of PNG_BEFORE_IHDR bit in png_ptr->mode, introduced when @@ -676,13 +727,15 @@ version 1.0.5t [March 4, 2000] a 24-bit visual if one is available, and to allow abbreviated options. Files in contrib/pngminus were revised to use the png_jmpbuf() macro. Removed spaces in makefile.linux and makefile.gcmmx, introduced in 1.0.5s -version 1.0.5u [March 5, 2000] + +Version 1.0.5u [March 5, 2000] Simplified the code that detects old png.h in png.c and pngtest.c Renamed png_spalette (_p, _pp) to png_sPLT_t (_tp, _tpp) Increased precision of rgb_to_gray calculations from 8 to 15 bits and added png_set_rgb_to_gray_fixed() function. Added makefile.bc32 (32-bit Borland C++, C mode) -version 1.0.5v [March 11, 2000] + +Version 1.0.5v [March 11, 2000] Added some parentheses to the png_jmpbuf macro definition. Updated references to the zlib home page, which has moved to freesoftware.com. Corrected bugs in documentation regarding png_read_row() and png_write_row(). @@ -690,10 +743,11 @@ version 1.0.5v [March 11, 2000] Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3, revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin) -version 1.0.6 [March 20, 2000] +Version 1.0.6 [March 20, 2000] Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c Added makefile.sggcc (SGI IRIX with gcc) -version 1.0.6d [April 7, 2000] + +Version 1.0.6d [April 7, 2000] Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO Added data_length parameter to png_decompress_chunk() function Revised documentation to remove reference to abandoned png_free_chnk functions @@ -702,7 +756,8 @@ version 1.0.6d [April 7, 2000] Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file Added a check for info_ptr->free_me&PNG_FREE_TEXT when freeing text in png.c Simplify png_sig_bytes() function to remove use of non-ISO-C strdup(). -version 1.0.6e [April 9, 2000] + +Version 1.0.6e [April 9, 2000] Added png_data_freer() function. In the code that checks for over-length tRNS chunks, added check of info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann) @@ -713,25 +768,29 @@ version 1.0.6e [April 9, 2000] is defined. Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c and mentioned the purposes of the two macros in libpng.txt/libpng.3. -version 1.0.6f [April 14, 2000] + +Version 1.0.6f [April 14, 2000] Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data. Add checks in png_set_text() for NULL members of the input text structure. Revised libpng.txt/libpng.3. - Removed superfluous prototype for png_set_itxt from png.h + Removed superfluous prototype for png_set_iTXt from png.h Removed "else" from pngread.c, after png_error(), and changed "0" to "length". Changed several png_errors about malformed ancillary chunks to png_warnings. -version 1.0.6g [April 24, 2000] + +Version 1.0.6g [April 24, 2000] Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined. Relocated paragraph about png_set_background() in libpng.3/libpng.txt and other revisions (Matthias Benckmann) Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and png_ptr members to restore binary compatibility with libpng-1.0.5 (breaks compatibility with libpng-1.0.6). -version 1.0.6h [April 24, 2000] + +Version 1.0.6h [April 24, 2000] Changed shared library so-number pattern from 2.x.y.z to xy.z (this builds libpng.so.10 & libpng.so.10.6h instead of libpng.so.2 & libpng.so.2.1.0.6h) This is a temporary change for test purposes. -version 1.0.6i [May 2, 2000] + +Version 1.0.6i [May 2, 2000] Rearranged some members at the end of png_info and png_struct, to put unknown_chunks_num and free_me within the original size of the png_structs and free_me, png_read_user_fn, and png_free_fn within the original png_info, @@ -756,11 +815,13 @@ version 1.0.6i [May 2, 2000] generate a libpng error if the modes aren't set and PNG_LEGACY_SUPPORTED was not defined. Added makefile.intel and updated makefile.watcom (Pawel Mrochen) -version 1.0.6j [May 3, 2000] + +Version 1.0.6j [May 3, 2000] Overloaded png_read_init() and png_write_init() with macros that convert calls to png_read_init_2() or png_write_init_2() that check the version and structure sizes. -version 1.0.7beta11 [May 7, 2000] + +Version 1.0.7beta11 [May 7, 2000] Removed the new PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT modes which are no longer used. Eliminated the three new members of png_text when PNG_LEGACY_SUPPORTED is @@ -771,7 +832,8 @@ version 1.0.7beta11 [May 7, 2000] Added PNGAPI macro, and added it to the definitions of all exported functions. Relocated version macro definitions ahead of the includes of zlib.h and pngconf.h in png.h. -version 1.0.7beta12 [May 12, 2000] + +Version 1.0.7beta12 [May 12, 2000] Revised pngset.c to avoid a problem with expanding the png_debug macro. Deleted some extraneous defines from pngconf.h Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined. @@ -779,7 +841,8 @@ version 1.0.7beta12 [May 12, 2000] Added png_access_version_number() function. Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data(). Expanded libpng.3/libpng.txt information about png_data_freer(). -version 1.0.7beta14 [May 17, 2000] (beta13 was not published) + +Version 1.0.7beta14 [May 17, 2000] (beta13 was not published) Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as warnings instead of errors, as pngrutil.c does. Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png() @@ -791,7 +854,8 @@ version 1.0.7beta14 [May 17, 2000] (beta13 was not published) Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5. Added png_set_invalid() function. Fixed incorrect illustrations of png_destroy_write_struct() in example.c. -version 1.0.7beta15 [May 30, 2000] + +Version 1.0.7beta15 [May 30, 2000] Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce fewer error messages. Rearranged checks for Z_OK to check the most likely path first in pngpread.c @@ -803,9 +867,11 @@ version 1.0.7beta15 [May 30, 2000] Fixed some bugs in the unused PNG_INCH_CONVERSIONS functions in pngget.c Set each pointer to NULL after freeing it in png_free_data(). Worked around a problem in pngconf.h; AIX's strings.h defines an "index" - macro that conflicts with libpng's png_color_16.index. (Dimitri Papadapoulos) + macro that conflicts with libpng's png_color_16.index. (Dimitri + Papadapoulos) Added "msvc" directory with MSVC++ project files (Simon-Pierre Cadieux). -version 1.0.7beta16 [June 4, 2000] + +Version 1.0.7beta16 [June 4, 2000] Revised the workaround of AIX string.h "index" bug. Added a check for overlength PLTE chunk in pngrutil.c. Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer @@ -815,23 +881,27 @@ version 1.0.7beta16 [June 4, 2000] Added PNG_USE_DLL macro. Revised the copyright/disclaimer/license notice. Added contrib/msvctest directory -version 1.0.7rc1 [June 9, 2000] + +Version 1.0.7rc1 [June 9, 2000] Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA (0x0400 not 0x0200) Added contrib/visupng directory (Willem van Schaik) -version 1.0.7beta18 [June 23, 2000] + +Version 1.0.7beta18 [June 23, 2000] Revised PNGAPI definition, and pngvcrd.c to work with __GCC__ and do not redefine PNGAPI if it is passed in via a compiler directive. Revised visupng/PngFile.c to remove returns from within the Try block. Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros. Updated contrib/visupng/cexcept.h to version 1.0.0. Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks. -version 1.0.7rc2 [June 28, 2000] + +Version 1.0.7rc2 [June 28, 2000] Updated license to include disclaimers required by UCITA. Fixed "DJBPP" typo in pnggccrd.c introduced in beta18. -version 1.0.7 [July 1, 2000] +Version 1.0.7 [July 1, 2000] Revised the definition of "trans_values" in libpng.3/libpng.txt -version 1.0.8beta1 [July 8, 2000] + +Version 1.0.8beta1 [July 8, 2000] Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks. Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and pngwutil.c. @@ -839,25 +909,30 @@ version 1.0.8beta1 [July 8, 2000] Removed unused "#include " from png.c Added WindowsCE support. Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment. -version 1.0.8beta2 [July 10, 2000] + +Version 1.0.8beta2 [July 10, 2000] Added project files to the wince directory and made further revisions of pngtest.c, pngrio.c, and pngwio.c in support of WindowsCE. -version 1.0.8beta3 [July 11, 2000] + +Version 1.0.8beta3 [July 11, 2000] Only set the PNG_FLAG_FREE_TRNS or PNG_FREE_TRNS flag in png_handle_tRNS() for indexed-color input files to avoid potential double-freeing trans array under some unusual conditions; problem was introduced in version 1.0.6f. Further revisions to pngtest.c and files in the wince subdirectory. -version 1.0.8beta4 [July 14, 2000] + +Version 1.0.8beta4 [July 14, 2000] Added the files pngbar.png and pngbar.jpg to the distribution. Added makefile.cygwin, and cygwin support in pngconf.h Added PNG_NO_ZALLOC_ZERO macro (makes png_zalloc skip zeroing memory) -version 1.0.8rc1 [July 16, 2000] + +Version 1.0.8rc1 [July 16, 2000] Revised png_debug() macros and statements to eliminate compiler warnings. -version 1.0.8 [July 24, 2000] +Version 1.0.8 [July 24, 2000] Added png_flush() in pngwrite.c, after png_write_IEND(). Updated makefile.hpux to build a shared library. -version 1.0.9beta1 [November 10, 2000] + +Version 1.0.9beta1 [November 10, 2000] Fixed typo in scripts/makefile.hpux Updated makevms.com in scripts and contrib/* and contrib/* (Martin Zinser) Fixed seqence-point bug in contrib/pngminus/png2pnm (Martin Zinser) @@ -876,59 +951,72 @@ version 1.0.9beta1 [November 10, 2000] Revised makefile.cygwin Fixed bugs in iCCP support in pngrutil.c and pngwutil.c. Replaced png_set_empty_plte_permitted() with png_permit_mng_features(). -version 1.0.9beta2 [November 19, 2000] + +Version 1.0.9beta2 [November 19, 2000] Renamed the "dll" subdirectory "projects". Added borland project files to "projects" subdirectory. Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate. Add error message in png_set_compression_buffer_size() when malloc fails. -version 1.0.9beta3 [November 23, 2000] + +Version 1.0.9beta3 [November 23, 2000] Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project. Removed the png_flush() in pngwrite.c that crashes some applications that don't set png_output_flush_fn. Added makefile.macosx and makefile.aix to scripts directory. -version 1.0.9beta4 [December 1, 2000] + +Version 1.0.9beta4 [December 1, 2000] Change png_chunk_warning to png_warning in png_check_keyword(). Increased the first part of msg buffer from 16 to 18 in png_chunk_error(). -version 1.0.9beta5 [December 15, 2000] + +Version 1.0.9beta5 [December 15, 2000] Added support for filter method 64 (for PNG datastreams embedded in MNG). -version 1.0.9beta6 [December 18, 2000] + +Version 1.0.9beta6 [December 18, 2000] Revised png_set_filter() to accept filter method 64 when appropriate. Added new PNG_HAVE_PNG_SIGNATURE bit to png_ptr->mode and use it to help prevent applications from using MNG features in PNG datastreams. Added png_permit_mng_features() function. Revised libpng.3/libpng.txt. Changed "filter type" to "filter method". -version 1.0.9rc1 [December 23, 2000] + +Version 1.0.9rc1 [December 23, 2000] Revised test for PNG_HAVE_PNG_SIGNATURE in pngrutil.c Fixed error handling of unknown compression type in png_decompress_chunk(). In pngconf.h, define __cdecl when _MSC_VER is defined. -version 1.0.9beta7 [December 28, 2000] + +Version 1.0.9beta7 [December 28, 2000] Changed PNG_TEXT_COMPRESSION_zTXt to PNG_COMPRESSION_TYPE_BASE several places. Revised memory management in png_set_hIST and png_handle_hIST in a backward compatible manner. PLTE and tRNS were revised similarly. Revised the iCCP chunk reader to ignore trailing garbage. -version 1.0.9beta8 [January 12, 2001] + +Version 1.0.9beta8 [January 12, 2001] Moved pngasmrd.h into pngconf.h. Improved handling of out-of-spec garbage iCCP chunks generated by PhotoShop. -version 1.0.9beta9 [January 15, 2001] + +Version 1.0.9beta9 [January 15, 2001] Added png_set_invalid, png_permit_mng_features, and png_mmx_supported to wince and msvc project module definition files. Minor revision of makefile.cygwin. Fixed bug with progressive reading of narrow interlaced images in pngpread.c -version 1.0.9beta10 [January 16, 2001] + +Version 1.0.9beta10 [January 16, 2001] Do not typedef png_FILE_p in pngconf.h when PNG_NO_STDIO is defined. Fixed "png_mmx_supported" typo in project definition files. -version 1.0.9beta11 [January 19, 2001] + +Version 1.0.9beta11 [January 19, 2001] Updated makefile.sgi to make shared library. Removed png_mmx_support() function and disabled PNG_MNG_FEATURES_SUPPORTED by default, for the benefit of DLL forward compatibility. These will be re-enabled in version 1.2.0. -version 1.0.9rc2 [January 22, 2001] + +Version 1.0.9rc2 [January 22, 2001] Revised cygwin support. -version 1.0.9 [January 31, 2001] +Version 1.0.9 [January 31, 2001] Added check of cygwin's ALL_STATIC in pngconf.h Added "-nommx" parameter to contrib/gregbook/rpng2-win and rpng2-x demos. -version 1.0.10beta1 [March 14, 2001] + +Version 1.0.10beta1 [March 14, 2001] Revised makefile.dec, makefile.sgi, and makefile.sggcc; added makefile.hpgcc. Reformatted libpng.3 to eliminate bad line breaks. Added checks for _mmx_supported in the read_filter_row function of pnggccrd.c @@ -941,33 +1029,39 @@ version 1.0.10beta1 [March 14, 2001] Fixed bugs in png_combine_row() in pnggccrd.c and pngvcrd.c (C version) Added warnings when retrieving or setting gamma=0. Increased the first part of msg buffer from 16 to 18 in png_chunk_warning(). -version 1.0.10rc1 [March 23, 2001] + +Version 1.0.10rc1 [March 23, 2001] Changed all instances of memcpy, strcpy, and strlen to png_memcpy, png_strcpy, and png_strlen. Revised png_mmx_supported() function in pnggccrd.c to return proper value. Fixed bug in progressive reading (pngpread.c) with small images (height < 8). -version 1.0.10 [March 30, 2001] +Version 1.0.10 [March 30, 2001] Deleted extraneous space (introduced in 1.0.9) from line 42 of makefile.cygwin Added beos project files (Chris Herborth) -version 1.0.11beta1 [April 3, 2001] + +Version 1.0.11beta1 [April 3, 2001] Added type casts on several png_malloc() calls (Dimitri Papadapoulos). Removed a no-longer needed AIX work-around from pngconf.h Changed several "//" single-line comments to C-style in pnggccrd.c -version 1.0.11beta2 [April 11, 2001] + +Version 1.0.11beta2 [April 11, 2001] Removed PNGAPI from several functions whose prototypes did not have PNGAPI. Updated scripts/pngos2.def -version 1.0.11beta3 [April 14, 2001] + +Version 1.0.11beta3 [April 14, 2001] Added checking the results of many instances of png_malloc() for NULL -version 1.0.11beta4 [April 20, 2001] + +Version 1.0.11beta4 [April 20, 2001] Undid the changes from version 1.0.11beta3. Added a check for NULL return from user's malloc_fn(). Removed some useless type casts of the NULL pointer. Added makefile.netbsd -version 1.0.11 [April 27, 2001] +Version 1.0.11 [April 27, 2001] Revised makefile.netbsd -version 1.0.12beta1 [May 14, 2001] + +Version 1.0.12beta1 [May 14, 2001] Test for Windows platform in pngconf.h when including malloc.h (Emmanuel Blot) Updated makefile.cygwin and handling of Cygwin's ALL_STATIC in pngconf.h Added some never-to-be-executed code in pnggccrd.c to quiet compiler warnings. @@ -975,21 +1069,25 @@ version 1.0.12beta1 [May 14, 2001] libpng will reallocate the png_struct and info_struct if they are too small. This retains future binary compatibility for old applications written for libpng-0.88 and earlier. -version 1.2.0beta1 [May 6, 2001] + +Version 1.2.0beta1 [May 6, 2001] Bumped DLLNUM to 2. Re-enabled PNG_MNG_FEATURES_SUPPORTED and enabled PNG_ASSEMBLER_CODE_SUPPORTED by default. Added runtime selection of MMX features. Added png_set_strip_error_numbers function and related macros. -version 1.2.0beta2 [May 7, 2001] + +Version 1.2.0beta2 [May 7, 2001] Finished merging 1.2.0beta1 with version 1.0.11 Added a check for attempts to read or write PLTE in grayscale PNG datastreams. -version 1.2.0beta3 [May 17, 2001] + +Version 1.2.0beta3 [May 17, 2001] Enabled user memory function by default. Modified png_create_struct so it passes user mem_ptr to user memory allocator. Increased png_mng_features flag from png_byte to png_uint_32. Bumped shared-library (so-number) and dll-number to 3. -version 1.2.0beta4 [June 23, 2001] + +Version 1.2.0beta4 [June 23, 2001] Check for missing profile length field in iCCP chunk and free chunk_data in case of truncated iCCP chunk. Bumped shared-library number to 3 in makefile.sgi and makefile.sggcc @@ -1003,7 +1101,8 @@ version 1.2.0beta4 [June 23, 2001] of png_write_oFFS width and height from png_uint_32 to png_int_32. Updated example.c Revised prototypes for png_debug_malloc and png_debug_free in pngtest.c -version 1.2.0beta5 [August 8, 2001] + +Version 1.2.0beta5 [August 8, 2001] Revised contrib/gregbook Revised makefile.gcmmx Revised pnggccrd.c to conditionally compile some thread-unsafe code only @@ -1014,27 +1113,32 @@ version 1.2.0beta5 [August 8, 2001] Replaced calls to fprintf(stderr,...) with png_warning() in pnggccrd.c Removed restriction that do_invert_mono only operate on 1-bit opaque files -version 1.2.0 [September 1, 2001] +Version 1.2.0 [September 1, 2001] Changed a png_warning() to png_debug() in pnggccrd.c Fixed contrib/gregbook/rpng-x.c, rpng2-x.c to avoid crash with XFreeGC(). -version 1.2.1beta1 [October 19, 2001] + +Version 1.2.1beta1 [October 19, 2001] Revised makefile.std in contrib/pngminus Include background_1 in png_struct regardless of gamma support. Revised makefile.netbsd and makefile.macosx, added makefile.darwin. Revised example.c to provide more details about using row_callback(). -version 1.2.1beta2 [October 25, 2001] + +Version 1.2.1beta2 [October 25, 2001] Added type cast to each NULL appearing in a function call, except for WINCE functions. Added makefile.so9. -version 1.2.1beta3 [October 27, 2001] + +Version 1.2.1beta3 [October 27, 2001] Removed type casts from all NULLs. Simplified png_create_struct_2(). -version 1.2.1beta4 [November 7, 2001] + +Version 1.2.1beta4 [November 7, 2001] Revised png_create_info_struct() and png_creat_struct_2(). Added error message if png_write_info() was omitted. Type cast NULLs appearing in function calls when _NO_PROTO or PNG_TYPECAST_NULL is defined. -version 1.2.1rc1 [November 24, 2001] + +Version 1.2.1rc1 [November 24, 2001] Type cast NULLs appearing in function calls except when PNG_NO_TYPECAST_NULL is defined. Changed typecast of "size" argument to png_size_t in pngmem.c calls to @@ -1043,14 +1147,16 @@ version 1.2.1rc1 [November 24, 2001] Updated makefile.sgi to recognize LIBPATH and INCPATH. Updated various makefiles so "make clean" does not remove previous major version of the shared library. -version 1.2.1rc2 [December 4, 2001] + +Version 1.2.1rc2 [December 4, 2001] Always allocate 256-entry internal palette, hist, and trans arrays, to avoid out-of-bounds memory reference caused by invalid PNG datastreams. Added a check for prefix_length > data_length in iCCP chunk handler. -version 1.2.1 [December 7, 2001] +Version 1.2.1 [December 7, 2001] None. -version 1.2.2beta1 [February 22, 2002] + +Version 1.2.2beta1 [February 22, 2002] Fixed a bug with reading the length of iCCP profiles (Larry Reeves). Revised makefile.linux, makefile.gcmmx, and makefile.sgi to generate libpng.a, libpng12.so (not libpng.so.3), and libpng12/png.h @@ -1060,13 +1166,15 @@ version 1.2.2beta1 [February 22, 2002] Revised calls to png_create_read_struct() and png_create_write_struct() for simpler debugging. Revised png_zalloc() so zlib handles errors (uses PNG_FLAG_MALLOC_NULL_MEM_OK) -version 1.2.2beta2 [February 23, 2002] + +Version 1.2.2beta2 [February 23, 2002] Check chunk_length and idat_size for invalid (over PNG_MAX_UINT) lengths. Check for invalid image dimensions in png_get_IHDR. Added missing "fi;" in the install target of the SGI makefiles. Added install-static to all makefiles that make shared libraries. Always do gamma compensation when image is partially transparent. -version 1.2.2beta3 [March 7, 2002] + +Version 1.2.2beta3 [March 7, 2002] Compute background.gray and background_1.gray even when color_type is RGB in case image gets reduced to gray later. Modified shared-library makefiles to install pkgconfig/libpngNN.pc. @@ -1076,12 +1184,14 @@ version 1.2.2beta3 [March 7, 2002] Added install-shared target to all makefiles that make shared libraries. Stopped a double free of palette, hist, and trans when not using free_me. Added makefile.32sunu for Sun Ultra 32 and makefile.64sunu for Sun Ultra 64. -version 1.2.2beta4 [March 8, 2002] + +Version 1.2.2beta4 [March 8, 2002] Compute background.gray and background_1.gray even when color_type is RGB in case image gets reduced to gray later (Jason Summers). Relocated a misplaced /bin/rm in the "install-shared" makefile targets Added PNG_1_0_X macro which can be used to build a 1.0.x-compatible library. -version 1.2.2beta5 [March 26, 2002] + +Version 1.2.2beta5 [March 26, 2002] Added missing PNGAPI to several function definitions. Check for invalid bit_depth or color_type in png_get_IHDR(), and check for missing PLTE or IHDR in png_push_read_chunk() (Matthias Clasen). @@ -1090,33 +1200,45 @@ version 1.2.2beta5 [March 26, 2002] Changed "()" to "{}" in scripts/libpng.pc.in. Revised makefiles to put png.h and pngconf.h only in $prefix/include/libpngNN Revised makefiles to make symlink to libpng.so.NN in addition to libpngNN.so -version 1.2.2beta6 [March 31, 2002] -version 1.0.13beta1 [March 31, 2002] + +Version 1.2.2beta6 [March 31, 2002] + +Version 1.0.13beta1 [March 31, 2002] Prevent png_zalloc() from trying to memset memory that it failed to acquire. Add typecasts of PNG_MAX_UINT in pngset_cHRM_fixed() (Matt Holgate). Ensure that the right function (user or default) is used to free the png_struct after an error in png_create_read_struct_2(). -version 1.2.2rc1 [April 7, 2002] -version 1.0.13rc1 [April 7, 2002] + +Version 1.2.2rc1 [April 7, 2002] + +Version 1.0.13rc1 [April 7, 2002] Save the ebx register in pnggccrd.c (Sami Farin) Add "mem_ptr = png_ptr->mem_ptr" in png_destroy_write_struct() (Paul Gardner). Updated makefiles to put headers in include/libpng and remove old include/*.h. -version 1.2.2 [April 15, 2002] -version 1.0.13 [April 15, 2002] +Version 1.2.2 [April 15, 2002] + +Version 1.0.13 [April 15, 2002] Revised description of png_set_filter() in libpng.3/libpng.txt. Revised makefile.netbsd and added makefile.neNNbsd and makefile.freebsd -version 1.0.13patch01 [April 17, 2002] -version 1.2.2patch01 [April 17, 2002] - Changed ${PNGMAJ}.${PNGVER} bug to ${PNGVER} in makefile.sgi and makefile.sggcc - Fixed VER -> PNGVER typo in makefile.macosx and added install-static to install + +Version 1.0.13patch01 [April 17, 2002] + +Version 1.2.2patch01 [April 17, 2002] + Changed ${PNGMAJ}.${PNGVER} bug to ${PNGVER} in makefile.sgi and + makefile.sggcc + Fixed VER -> PNGVER typo in makefile.macosx and added install-static to + install Added install: target to makefile.32sunu and makefile.64sunu -version 1.0.13patch03 [April 18, 2002] -version 1.2.2patch03 [April 18, 2002] + +Version 1.0.13patch03 [April 18, 2002] + +Version 1.2.2patch03 [April 18, 2002] Revised 15 makefiles to link libpng.a to libpngNN.a and the include libpng subdirectory to libpngNN subdirectory without the full pathname. Moved generation of libpng.pc from "install" to "all" in 15 makefiles. -version 1.2.3rc1 [April 28, 2002] + +Version 1.2.3rc1 [April 28, 2002] Added install-man target to 15 makefiles (Dimitri Papadopolous-Orfanos). Added $(DESTDIR) feature to 24 makefiles (Tim Mooney) Fixed bug with $prefix, should be $(prefix) in makefile.hpux. @@ -1128,70 +1250,83 @@ version 1.2.3rc1 [April 28, 2002] to put one in their application. Restored png_zalloc() and png_zfree() prototypes to version 1.2.1 and removed them from module definition files. -version 1.2.3rc2 [May 1, 2002] + +Version 1.2.3rc2 [May 1, 2002] Fixed bug in reporting number of channels in pngget.c and pngset.c, that was introduced in version 1.2.2beta5. Exported png_zalloc(), png_zfree(), png_default_read(), png_default_write(), png_default_flush(), and png_push_fill_buffer() and included them in module definition files. Added "libpng.pc" dependency to the "install-shared" target in 15 makefiles. -version 1.2.3rc3 [May 1, 2002] + +Version 1.2.3rc3 [May 1, 2002] Revised prototype for png_default_flush() Remove old libpng.pc and libpngNN.pc before installing new ones. -version 1.2.3rc4 [May 2, 2002] + +Version 1.2.3rc4 [May 2, 2002] Typos in *.def files (png_default_read|write -> png_default_read|write_data) In makefiles, changed rm libpng.NN.pc to rm libpngNN.pc - Added libpng-config and libpngNN-config and modified makefiles to install them. + Added libpng-config and libpngNN-config and modified makefiles to install + them. Changed $(MANPATH) to $(DESTDIR)$(MANPATH) in makefiles Added "Win32 DLL VB" configuration to projects/msvc/libpng.dsp -version 1.2.3rc5 [May 11, 2002] + +Version 1.2.3rc5 [May 11, 2002] Changed "error" and "message" in prototypes to "error_message" and "warning_message" to avoid namespace conflict. Revised 15 makefiles to build libpng-config from libpng-config-*.in Once more restored png_zalloc and png_zfree to regular nonexported form. Restored png_default_read|write_data, png_default_flush, png_read_fill_buffer - to nonexported form, but with PNGAPI, and removed them from module def files. -version 1.2.3rc6 [May 14, 2002] + to nonexported form, but with PNGAPI, and removed them from module def + files. + +Version 1.2.3rc6 [May 14, 2002] Removed "PNGAPI" from png_zalloc() and png_zfree() in png.c Changed "Gz" to "Gd" in projects/msvc/libpng.dsp and zlib.dsp. Removed leftover libpng-config "sed" script from four makefiles. Revised libpng-config creating script in 16 makefiles. -version 1.2.3 [May 22, 2002] +Version 1.2.3 [May 22, 2002] Revised libpng-config target in makefile.cygwin. Removed description of png_set_mem_fn() from documentation. Revised makefile.freebsd. Minor cosmetic changes to 15 makefiles, e.g., $(DI) = $(DESTDIR)/$(INCDIR). Revised projects/msvc/README.txt Changed -lpng to -lpngNN in LDFLAGS in several makefiles. -version 1.2.4beta1 [May 24, 2002] + +Version 1.2.4beta1 [May 24, 2002] Added libpng.pc and libpng-config to "all:" target in 16 makefiles. Fixed bug in 16 makefiles: $(DESTDIR)/$(LIBPATH) to $(DESTDIR)$(LIBPATH) Added missing "\" before closing double quote in makefile.gcmmx. Plugged various memory leaks; added png_malloc_warn() and png_set_text_2() functions. -version 1.2.4beta2 [June 25, 2002] + +Version 1.2.4beta2 [June 25, 2002] Plugged memory leak of png_ptr->current_text (Matt Holgate). Check for buffer overflow before reading CRC in pngpread.c (Warwick Allison) Added -soname to the loader flags in makefile.dec, makefile.sgi, and makefile.sggcc. Added "test-installed" target to makefile.linux, makefile.gcmmx, makefile.sgi, and makefile.sggcc. -version 1.2.4beta3 [June 28, 2002] + +Version 1.2.4beta3 [June 28, 2002] Plugged memory leak of row_buf in pngtest.c when there is a png_error(). Detect buffer overflow in pngpread.c when IDAT is corrupted with extra data. Added "test-installed" target to makefile.32sunu, makefile.64sunu, makefile.beos, makefile.darwin, makefile.dec, makefile.macosx, makefile.solaris, makefile.hpux, makefile.hpgcc, and makefile.so9. -version 1.2.4rc1 and 1.0.14rc1 [July 2, 2002] + +Version 1.2.4rc1 and 1.0.14rc1 [July 2, 2002] Added "test-installed" target to makefile.cygwin and makefile.sco. Revised pnggccrd.c to be able to back out version 1.0.x via PNG_1_0_X macro. -version 1.2.4 and 1.0.14 [July 8, 2002] +Version 1.2.4 and 1.0.14 [July 8, 2002] Changed png_warning() to png_error() when width is too large to process. -version 1.2.4patch01 [July 20, 2002] + +Version 1.2.4patch01 [July 20, 2002] Revised makefile.cygwin to use DLL number 12 instead of 13. -version 1.2.5beta1 [August 6, 2002] + +Version 1.2.5beta1 [August 6, 2002] Added code to contrib/gregbook/readpng2.c to ignore unused chunks. Replaced toucan.png in contrib/gregbook (it has been corrupt since 1.0.11) Removed some stray *.o files from contrib/gregbook. @@ -1200,36 +1335,43 @@ version 1.2.5beta1 [August 6, 2002] Prevent png_ptr->pass from exceeding 7 in png_push_finish_row(). Updated makefile.hpgcc Updated png.c and pnggccrd.c handling of return from png_mmx_support() -version 1.2.5beta2 [August 15, 2002] + +Version 1.2.5beta2 [August 15, 2002] Only issue png_warning() about "Too much data" in pngpread.c when avail_in is nonzero. Updated makefiles to install a separate libpng.so.3 with its own rpath. -version 1.2.5rc1 and 1.0.15rc1 [August 24, 2002] + +Version 1.2.5rc1 and 1.0.15rc1 [August 24, 2002] Revised makefiles to not remove previous minor versions of shared libraries. -version 1.2.5rc2 and 1.0.15rc2 [September 16, 2002] + +Version 1.2.5rc2 and 1.0.15rc2 [September 16, 2002] Revised 13 makefiles to remove "-lz" and "-L$(ZLIBLIB)", etc., from shared library loader directive. Added missing "$OBJSDLL" line to makefile.gcmmx. Added missing "; fi" to makefile.32sunu. -version 1.2.5rc3 and 1.0.15rc3 [September 18, 2002] + +Version 1.2.5rc3 and 1.0.15rc3 [September 18, 2002] Revised libpng-config script. -version 1.2.5 and 1.0.15 [October 3, 2002] +Version 1.2.5 and 1.0.15 [October 3, 2002] Revised makefile.macosx, makefile.darwin, makefile.hpgcc, and makefile.hpux, and makefile.aix. Relocated two misplaced PNGAPI lines in pngtest.c -version 1.2.6beta1 [October 22, 2002] + +Version 1.2.6beta1 [October 22, 2002] Commented out warning about uninitialized mmx_support in pnggccrd.c. Changed "IBMCPP__" flag to "__IBMCPP__" in pngconf.h. Relocated two more misplaced PNGAPI lines in pngtest.c Fixed memory overrun bug in png_do_read_filler() with 16-bit datastreams, introduced in version 1.0.2. Revised makefile.macosx, makefile.dec, makefile.aix, and makefile.32sunu. -version 1.2.6beta2 [November 1, 2002] + +Version 1.2.6beta2 [November 1, 2002] Added libpng-config "--ldopts" output. Added "AR=ar" and "ARFLAGS=rc" and changed "ar rc" to "$(AR) $(ARFLAGS)" in makefiles. -version 1.2.6beta3 [July 18, 2004] + +Version 1.2.6beta3 [July 18, 2004] Reverted makefile changes from version 1.2.6beta2 and some of the changes from version 1.2.6beta1; these will be postponed until version 1.2.7. Version 1.2.6 is going to be a simple bugfix release. @@ -1282,7 +1424,8 @@ version 1.2.6beta3 [July 18, 2004] Updated contrib/visupng/VisualPng.dsp (Cosmin). Updated contrib/visupng/cexcept.h to version 2.0.0 (Cosmin). Added a separate distribution with "configure" and supporting files (Junichi). -version 1.2.6beta4 [July 28, 2004] + +Version 1.2.6beta4 [July 28, 2004] Added user ability to change png_size_t via a PNG_SIZE_T macro. Added png_sizeof() and png_convert_size() functions. Added PNG_SIZE_MAX (maximum value of a png_size_t variable. @@ -1304,7 +1447,8 @@ version 1.2.6beta4 [July 28, 2004] Added some "#if PNG_WRITE_SUPPORTED" blocks. Added #ifdef to remove some redundancy in png_malloc_default(). Use png_malloc instead of png_zalloc to allocate the pallete. -version 1.0.16rc1 and 1.2.6rc1 [August 4, 2004] + +Version 1.0.16rc1 and 1.2.6rc1 [August 4, 2004] Fixed buffer overflow vulnerability in png_handle_tRNS() Fixed integer arithmetic overflow vulnerability in png_read_png(). Fixed some harmless bugs in png_handle_sBIT, etc, that would cause @@ -1319,7 +1463,8 @@ version 1.0.16rc1 and 1.2.6rc1 [August 4, 2004] Fixed wrong cast of returns from png_get_user_width|height_max(). Changed some "keep the compiler happy" from empty statements to returns, Revised libpng.txt to remove 1.2.x stuff from the 1.0.x distribution -version 1.0.16rc2 and 1.2.6rc2 [August 7, 2004] + +Version 1.0.16rc2 and 1.2.6rc2 [August 7, 2004] Revised makefile.darwin and makefile.solaris. Removed makefile.macosx. Revised pngtest's png_debug_malloc() to use png_malloc() instead of png_malloc_default() which is not supposed to be exported. @@ -1333,91 +1478,106 @@ version 1.0.16rc2 and 1.2.6rc2 [August 7, 2004] Changed "HANDLE_CHUNK_*" to "PNG_HANDLE_CHUNK_*" (Cosmin) Added "-@/bin/rm -f $(DL)/$(LIBNAME).so.$(PNGMAJ)" to 15 *NIX makefiles. Added code to update the row_info->colortype in png_do_read_filler() (MSB). -version 1.0.16rc3 and 1.2.6rc3 [August 9, 2004] + +Version 1.0.16rc3 and 1.2.6rc3 [August 9, 2004] Eliminated use of "abs()" in testing cHRM and gAMA values, to avoid trouble with some 64-bit compilers. Created PNG_OUT_OF_RANGE() macro. Revised documentation of png_set_keep_unknown_chunks(). Check handle_as_unknown status in pngpread.c, as in pngread.c previously. Moved "PNG_HANDLE_CHUNK_*" macros out of PNG_INTERNAL section of png.h Added "rim" definitions for CONST4 and CONST6 in pnggccrd.c -version 1.0.16rc4 and 1.2.6rc4 [August 10, 2004] + +Version 1.0.16rc4 and 1.2.6rc4 [August 10, 2004] Fixed mistake in pngtest.c introduced in 1.2.6rc2 (declaration of "pinfo" was out of place). -version 1.0.16rc5 and 1.2.6rc5 [August 10, 2004] + +Version 1.0.16rc5 and 1.2.6rc5 [August 10, 2004] Moved "PNG_HANDLE_CHUNK_*" macros out of PNG_ASSEMBLER_CODE_SUPPORTED section of png.h where they were inadvertently placed in version rc3. -version 1.2.6 and 1.0.16 [August 15, 2004] +Version 1.2.6 and 1.0.16 [August 15, 2004] Revised pngtest so memory allocation testing is only done when PNG_DEBUG==1. -version 1.2.7beta1 [August 26, 2004] + +Version 1.2.7beta1 [August 26, 2004] Removed unused pngasmrd.h file. Removed references to uu.net for archived files. Added references to PNG Spec (second edition) and the PNG ISO/IEC Standard. Added "test-dd" target in 15 makefiles, to run pngtest in DESTDIR. Fixed bug with "optimized window size" in the IDAT datastream, that causes libpng to write PNG files with incorrect zlib header bytes. -version 1.2.7beta2 [August 28, 2004] + +Version 1.2.7beta2 [August 28, 2004] Fixed bug with sCAL chunk and big-endian machines (David Munro). Undid new code added in 1.2.6rc2 to update the color_type in png_set_filler(). Added png_set_add_alpha() that updates color type. -version 1.0.17rc1 and 1.2.7rc1 [September 4, 2004] + +Version 1.0.17rc1 and 1.2.7rc1 [September 4, 2004] Revised png_set_strip_filler() to not remove alpha if color_type has alpha. -version 1.2.7 and 1.0.17 [September 12, 2004] +Version 1.2.7 and 1.0.17 [September 12, 2004] Added makefile.hp64 Changed projects/msvc/png32ms.def to scripts/png32ms.def in makefile.cygwin -version 1.2.8beta1 [November 1, 2004] + +Version 1.2.8beta1 [November 1, 2004] Fixed bug in png_text_compress() that would fail to complete a large block. Fixed bug, introduced in libpng-1.2.7, that overruns a buffer during strip alpha operation in png_do_strip_filler(). Added PNG_1_2_X definition in pngconf.h Use #ifdef to comment out png_info_init in png.c and png_read_init in pngread.c (as of 1.3.0) -version 1.2.8beta2 [November 2, 2004] + +Version 1.2.8beta2 [November 2, 2004] Reduce color_type to a nonalpha type after strip alpha operation in png_do_strip_filler(). -version 1.2.8beta3 [November 3, 2004] + +Version 1.2.8beta3 [November 3, 2004] Revised definitions of PNG_MAX_UINT_32, PNG_MAX_SIZE, and PNG_MAXSUM -version 1.2.8beta4 [November 12, 2004] + +Version 1.2.8beta4 [November 12, 2004] Fixed (again) definition of PNG_LIBPNG_VER_DLLNUM in png.h (Cosmin). Added PNG_LIBPNG_BUILD_PRIVATE in png.h (Cosmin). Set png_ptr->zstream.data_type to Z_BINARY, to avoid unnecessary detection of data type in deflate (Cosmin). Deprecated but continue to support SPECIALBUILD and PRIVATEBUILD in favor of PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING. -version 1.2.8beta5 [November 20, 2004] + +Version 1.2.8beta5 [November 20, 2004] Use png_ptr->flags instead of png_ptr->transformations to pass PNG_STRIP_ALPHA info to png_do_strip_filler(), to preserve ABI compatibility. Revised handling of SPECIALBUILD, PRIVATEBUILD, PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING. -version 1.2.8rc1 [November 24, 2004] + +Version 1.2.8rc1 [November 24, 2004] Moved handling of BUILD macros from pngconf.h to png.h Added definition of PNG_LIBPNG_BASE_TYPE in png.h, inadvertently omitted from beta5. Revised scripts/pngw32.rc Despammed mailing addresses by masking "@" with "at". Inadvertently installed a supposedly faster test version of pngrutil.c -version 1.2.8rc2 [November 26, 2004] + +Version 1.2.8rc2 [November 26, 2004] Added two missing "\" in png.h Change tests in pngread.c and pngpread.c to if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) png_do_read_transformations(png_ptr); -version 1.2.8rc3 [November 28, 2004] + +Version 1.2.8rc3 [November 28, 2004] Reverted pngrutil.c to version libpng-1.2.8beta5. Added scripts/makefile.elf with supporting code in pngconf.h for symbol versioning (John Bowler). -version 1.2.8rc4 [November 29, 2004] + +Version 1.2.8rc4 [November 29, 2004] Added projects/visualc7 (Simon-pierre). -version 1.2.8rc5 [November 29, 2004] + +Version 1.2.8rc5 [November 29, 2004] Fixed new typo in scripts/pngw32.rc -version 1.2.8 [December 3, 2004] +Version 1.2.8 [December 3, 2004] Removed projects/visualc7, added projects/visualc71. -version 1.2.9beta1 [February 21, 2006] - +Version 1.2.9beta1 [February 21, 2006] Initialized some structure members in pngwutil.c to avoid gcc-4.0.0 complaints Revised man page and libpng.txt to make it clear that one should not call png_read_end or png_write_end after png_read_png or png_write_png. @@ -1439,8 +1599,7 @@ version 1.2.9beta1 [February 21, 2006] Fixed scripts/makefile.cygwin (Christian Biesinger, Cosmin). Default iTXt support was inadvertently enabled. -version 1.2.9beta2 [February 21, 2006] - +Version 1.2.9beta2 [February 21, 2006] Check for png_rgb_to_gray and png_gray_to_rgb read transformations before checking for png_read_dither in pngrtran.c Revised checking of chromaticity limits to accommodate extended RGB @@ -1453,8 +1612,7 @@ version 1.2.9beta2 [February 21, 2006] Eliminated distributions without the "configure" script. Updated INSTALL instructions. -version 1.2.9beta3 [February 24, 2006] - +Version 1.2.9beta3 [February 24, 2006] Fixed CRCRLF line endings in contrib/visupng/VisualPng.dsp Made libpng.pc respect EXEC_PREFIX (D. P. Kreil, J. Bowler) Removed reference to pngasmrd.h from Makefile.am @@ -1463,8 +1621,7 @@ version 1.2.9beta3 [February 24, 2006] Renamed ANNOUNCE to NEWS. Created AUTHORS file. -version 1.2.9beta4 [March 3, 2006] - +Version 1.2.9beta4 [March 3, 2006] Changed definition of PKGCONFIG from $prefix/lib to $libdir in configure.ac Reverted to filenames LICENSE and ANNOUNCE; removed AUTHORS and COPYING. Removed newline from the end of some error and warning messages. @@ -1475,17 +1632,17 @@ version 1.2.9beta4 [March 3, 2006] Added "OS2" to list of systems that don't need underscores, in pnggccrd.c Removed libpng version and date from *.c files. -version 1.2.9beta5 [March 4, 2006] +Version 1.2.9beta5 [March 4, 2006] Removed trailing blanks from source files. Put version and date of latest change in each source file, and changed copyright year accordingly. More cleanup of configure.ac, Makefile.am, and associated scripts. Restored scripts/makefile.elf which was inadvertently deleted. -version 1.2.9beta6 [March 6, 2006] +Version 1.2.9beta6 [March 6, 2006] Fixed typo (RELEASE) in configuration files. -version 1.2.9beta7 [March 7, 2006] +Version 1.2.9beta7 [March 7, 2006] Removed libpng.vers and libpng.sym from libpng12_la_SOURCES in Makefile.am Fixed inconsistent #ifdef's around png_sig_bytes() and png_set_sCAL_s() in png.h. @@ -1493,7 +1650,7 @@ version 1.2.9beta7 [March 7, 2006] Made cosmetic changes to some makefiles, adding LN_SF and other macros. Made some makefiles accept "exec_prefix". -version 1.2.9beta8 [March 9, 2006] +Version 1.2.9beta8 [March 9, 2006] Fixed some "#if defined (..." which should be "#if defined(..." Bug introduced in libpng-1.2.8. Fixed inconsistency in definition of png_default_read_data() @@ -1504,82 +1661,82 @@ version 1.2.9beta8 [March 9, 2006] Added png_set_expand_gray_1_2_4_to_8() and deprecated png_set_gray_1_2_4_to_8() which also expands tRNS to alpha. -version 1.2.9beta9 [March 10, 2006] +Version 1.2.9beta9 [March 10, 2006] Include "config.h" in pngconf.h when available. Added some checks for NULL png_ptr or NULL info_ptr (timeless) -version 1.2.9beta10 [March 20, 2006] +Version 1.2.9beta10 [March 20, 2006] Removed extra CR from contrib/visualpng/VisualPng.dsw (Cosmin) Made pnggccrd.c PIC-compliant (Christian Aichinger). Added makefile.mingw (Wolfgang Glas). Revised pngconf.h MMX checking. -version 1.2.9beta11 [March 22, 2006] +Version 1.2.9beta11 [March 22, 2006] Fixed out-of-order declaration in pngwrite.c that was introduced in beta9 Simplified some makefiles by using LIBSO, LIBSOMAJ, and LIBSOVER macros. -version 1.2.9rc1 [March 31, 2006] +Version 1.2.9rc1 [March 31, 2006] Defined PNG_USER_PRIVATEBUILD when including "pngusr.h" (Cosmin). Removed nonsensical assertion check from pngtest.c (Cosmin). -version 1.2.9 [April 14, 2006] +Version 1.2.9 [April 14, 2006] Revised makefile.beos and added "none" selector in ltmain.sh -version 1.2.10beta1 [April 15, 2006] +Version 1.2.10beta1 [April 15, 2006] Renamed "config.h" to "png_conf.h" and revised Makefile.am to add -DPNG_BUILDING_LIBPNG to compile directive, and modified pngconf.h to include png_conf.h only when PNG_BUILDING_LIBPNG is defined. -version 1.2.10beta2 [April 15, 2006] +Version 1.2.10beta2 [April 15, 2006] Manually updated Makefile.in and configure. Changed png_conf.h.in back to config.h. -version 1.2.10beta3 [April 15, 2006] +Version 1.2.10beta3 [April 15, 2006] Change png_conf.h back to config.h in pngconf.h. -version 1.2.10beta4 [April 16, 2006] +Version 1.2.10beta4 [April 16, 2006] Change PNG_BUILDING_LIBPNG to PNG_CONFIGURE_LIBPNG in config/Makefile*. -version 1.2.10beta5 [April 16, 2006] +Version 1.2.10beta5 [April 16, 2006] Added a configure check for compiling assembler code in pnggccrd.c -version 1.2.10beta6 [April 17, 2006] +Version 1.2.10beta6 [April 17, 2006] Revised the configure check for pnggccrd.c Moved -DPNG_CONFIGURE_LIBPNG into @LIBPNG_DEFINES@ Added @LIBPNG_DEFINES@ to arguments when building libpng.sym -version 1.2.10beta7 [April 18, 2006] +Version 1.2.10beta7 [April 18, 2006] Change "exec_prefix=$prefix" to "exec_prefix=$(prefix)" in makefiles. -version 1.2.10rc1 [April 19, 2006] +Version 1.2.10rc1 [April 19, 2006] Ensure pngconf.h doesn't define both PNG_USE_PNGGCCRD and PNG_USE_PNGVCRD Fixed "LN_FS" typo in makefile.sco and makefile.solaris. -version 1.2.10rc2 [April 20, 2006] +Version 1.2.10rc2 [April 20, 2006] Added a backslash between -DPNG_CONFIGURE_LIBPNG and -DPNG_NO_ASSEMBLER_CODE in configure.ac and configure Made the configure warning about versioned symbols less arrogant. -version 1.2.10rc3 [April 21, 2006] +Version 1.2.10rc3 [April 21, 2006] Added a note in libpng.txt that png_set_sig_bytes(8) can be used when writing an embedded PNG without the 8-byte signature. Revised makefiles and configure to avoid making links to libpng.so.* -version 1.2.10 [April 23, 2006] +Version 1.2.10 [April 23, 2006] Reverted configure to "rc2" state. -version 1.2.11beta1 [May 31, 2006] +Version 1.2.11beta1 [May 31, 2006] scripts/libpng.pc.in contained "configure" style version info and would not work with makefiles. The shared-library makefiles were linking to libpng.so.0 instead of libpng.so.3 compatibility as the library. -version 1.2.11beta2 [June 2, 2006] +Version 1.2.11beta2 [June 2, 2006] Increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid buffer overflow. Fixed bug in example.c (png_set_palette_rgb -> png_set_palette_to_rgb) -version 1.2.11beta3 [June 5, 2006] +Version 1.2.11beta3 [June 5, 2006] Prepended "#! /bin/sh" to ltmail.sh and contrib/pngminus/*.sh (Cosmin). Removed the accidental leftover Makefile.in~ (Cosmin). Avoided potential buffer overflow and optimized buffer in @@ -1587,116 +1744,116 @@ version 1.2.11beta3 [June 5, 2006] Removed the include directories and libraries from CFLAGS and LDFLAGS in scripts/makefile.gcc (Nelson A. de Oliveira, Cosmin). -version 1.2.11beta4 [June 6, 2006] +Version 1.2.11beta4 [June 6, 2006] Allow zero-length IDAT chunks after the entire zlib datastream, but not after another intervening chunk type. -version 1.0.19rc1, 1.2.11rc1 [June 13, 2006] +Version 1.0.19rc1, 1.2.11rc1 [June 13, 2006] Deleted extraneous square brackets from [config.h] in configure.ac -version 1.0.19rc2, 1.2.11rc2 [June 14, 2006] +Version 1.0.19rc2, 1.2.11rc2 [June 14, 2006] Added prototypes for PNG_INCH_CONVERSIONS functions to png.h Revised INSTALL and autogen.sh Fixed typo in several makefiles (-W1 should be -Wl) Added typedef for png_int_32 and png_uint_32 on 64-bit systems. -version 1.0.19rc3, 1.2.11rc3 [June 15, 2006] +Version 1.0.19rc3, 1.2.11rc3 [June 15, 2006] Removed the new typedefs for 64-bit systems (delay until version 1.4.0) Added one zero element to png_gamma_shift[] array in pngrtran.c to avoid reading out of bounds. -version 1.0.19rc4, 1.2.11rc4 [June 15, 2006] +Version 1.0.19rc4, 1.2.11rc4 [June 15, 2006] Really removed the new typedefs for 64-bit systems. -version 1.0.19rc5, 1.2.11rc5 [June 22, 2006] +Version 1.0.19rc5, 1.2.11rc5 [June 22, 2006] Removed png_sig_bytes entry from scripts/pngw32.def -version 1.0.19, 1.2.11 [June 26, 2006] +Version 1.0.19, 1.2.11 [June 26, 2006] None. -version 1.0.20, 1.2.12 [June 27, 2006] +Version 1.0.20, 1.2.12 [June 27, 2006] Really increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid buffer overflow. -version 1.2.13beta1 [October 2, 2006] +Version 1.2.13beta1 [October 2, 2006] Removed AC_FUNC_MALLOC from configure.ac Work around Intel-Mac compiler bug by setting PNG_NO_MMX_CODE in pngconf.h Change "logical" to "bitwise" throughout documentation. - Detect and fix attempt to write wrong iCCP profile length. + Detect and fix attempt to write wrong iCCP profile length (CVE-2006-7244) -version 1.0.21, 1.2.13 [November 14, 2006] +Version 1.0.21, 1.2.13 [November 14, 2006] Fix potential buffer overflow in sPLT chunk handler. Fix Makefile.am to not try to link to noexistent files. Check all exported functions for NULL png_ptr. -version 1.2.14beta1 [November 17, 2006] +Version 1.2.14beta1 [November 17, 2006] Relocated three misplaced tests for NULL png_ptr. Built Makefile.in with automake-1.9.6 instead of 1.9.2. Build configure with autoconf-2.60 instead of 2.59 -version 1.2.14beta2 [November 17, 2006] +Version 1.2.14beta2 [November 17, 2006] Added some typecasts in png_zalloc(). -version 1.2.14rc1 [November 20, 2006] +Version 1.2.14rc1 [November 20, 2006] Changed "strtod" to "png_strtod" in pngrutil.c -version 1.0.22, 1.2.14 [November 27, 2006] +Version 1.0.22, 1.2.14 [November 27, 2006] Added missing "$(srcdir)" in Makefile.am and Makefile.in -version 1.2.15beta1 [December 3, 2006] +Version 1.2.15beta1 [December 3, 2006] Generated configure with autoconf-2.61 instead of 2.60 Revised configure.ac to update libpng.pc and libpng-config. -version 1.2.15beta2 [December 3, 2006] +Version 1.2.15beta2 [December 3, 2006] Always export MMX asm functions, just stubs if not building pnggccrd.c -version 1.2.15beta3 [December 4, 2006] +Version 1.2.15beta3 [December 4, 2006] Add "png_bytep" typecast to profile while calculating length in pngwutil.c -version 1.2.15beta4 [December 7, 2006] +Version 1.2.15beta4 [December 7, 2006] Added scripts/CMakeLists.txt Changed PNG_NO_ASSEMBLER_CODE to PNG_NO_MMX_CODE in scripts, like 1.4.0beta -version 1.2.15beta5 [December 7, 2006] +Version 1.2.15beta5 [December 7, 2006] Changed some instances of PNG_ASSEMBLER_* to PNG_MMX_* in pnggccrd.c Revised scripts/CMakeLists.txt -version 1.2.15beta6 [December 13, 2006] +Version 1.2.15beta6 [December 13, 2006] Revised scripts/CMakeLists.txt and configure.ac -version 1.2.15rc1 [December 18, 2006] +Version 1.2.15rc1 [December 18, 2006] Revised scripts/CMakeLists.txt -version 1.2.15rc2 [December 21, 2006] +Version 1.2.15rc2 [December 21, 2006] Added conditional #undef jmpbuf in pngtest.c to undo #define in AIX headers. Added scripts/makefile.nommx -version 1.2.15rc3 [December 25, 2006] +Version 1.2.15rc3 [December 25, 2006] Fixed shared library numbering error that was introduced in 1.2.15beta6. -version 1.2.15rc4 [December 27, 2006] +Version 1.2.15rc4 [December 27, 2006] Fixed handling of rgb_to_gray when png_ptr->color.gray isn't set. -version 1.2.15rc5 [December 31, 2006] +Version 1.2.15rc5 [December 31, 2006] Revised handling of rgb_to_gray. -version 1.2.15 [January 5, 2007] +Version 1.2.15 [January 5, 2007] Added some (unsigned long) typecasts in pngtest.c to avoid printing errors. -version 1.2.16beta1 [January 6, 2007] +Version 1.2.16beta1 [January 6, 2007] Fix bugs in makefile.nommx -version 1.2.16beta2 [January 16, 2007] +Version 1.2.16beta2 [January 16, 2007] Revised scripts/CMakeLists.txt -version 1.2.16 [January 31, 2007] +Version 1.2.16 [January 31, 2007] No changes. -version 1.2.17beta1 [March 6, 2007] +Version 1.2.17beta1 [March 6, 2007] Revised scripts/CMakeLists.txt to install both shared and static libraries. Deleted a redundant line from pngset.c. -version 1.2.17beta2 [April 26, 2007] +Version 1.2.17beta2 [April 26, 2007] Relocated misplaced test for png_ptr == NULL in pngpread.c Change "==" to "&" for testing PNG_RGB_TO_GRAY_ERR & PNG_RGB_TO_GRAY_WARN flags. @@ -1705,10 +1862,10 @@ version 1.2.17beta2 [April 26, 2007] Added "const" to some array declarations. Mention examples of libpng usage in the libpng*.txt and libpng.3 documents. -version 1.2.17rc1 [May 4, 2007] +Version 1.2.17rc1 [May 4, 2007] No changes. -version 1.2.17rc2 [May 8, 2007] +Version 1.2.17rc2 [May 8, 2007] Moved several PNG_HAVE_* macros out of PNG_INTERNAL because applications calling set_unknown_chunk_location() need them. Changed transformation flag from PNG_EXPAND_tRNS to PNG_EXPAND in @@ -1717,64 +1874,64 @@ version 1.2.17rc2 [May 8, 2007] can be free'ed in case of error. Revised unknown chunk handling in pngrutil.c and pngpread.c to use this structure. -version 1.2.17rc3 [May 8, 2007] +Version 1.2.17rc3 [May 8, 2007] Revised symbol-handling in configure script. -version 1.2.17rc4 [May 10, 2007] +Version 1.2.17rc4 [May 10, 2007] Revised unknown chunk handling to avoid storing unknown critical chunks. -version 1.0.25 [May 15, 2007] -version 1.2.17 [May 15, 2007] +Version 1.0.25 [May 15, 2007] +Version 1.2.17 [May 15, 2007] Added "png_ptr->num_trans=0" before error return in png_handle_tRNS, to eliminate a vulnerability (CVE-2007-2445, CERT VU#684664) -version 1.0.26 [May 15, 2007] -version 1.2.18 [May 15, 2007] +Version 1.0.26 [May 15, 2007] +Version 1.2.18 [May 15, 2007] Reverted the libpng-1.2.17rc3 change to symbol-handling in configure script -version 1.2.19beta1 [May 18, 2007] +Version 1.2.19beta1 [May 18, 2007] Changed "const static" to "static PNG_CONST" everywhere, mostly undoing change of libpng-1.2.17beta2. Changed other "const" to "PNG_CONST" Changed some handling of unused parameters, to avoid compiler warnings. "if (unused == NULL) return;" becomes "unused = unused". -version 1.2.19beta2 [May 18, 2007] +Version 1.2.19beta2 [May 18, 2007] Only use the valid bits of tRNS value in png_do_expand() (Brian Cartier) -version 1.2.19beta3 [May 19, 2007] +Version 1.2.19beta3 [May 19, 2007] Add some "png_byte" typecasts in png_check_keyword() and write new_key instead of key in zTXt chunk (Kevin Ryde). -version 1.2.19beta4 [May 21, 2007] +Version 1.2.19beta4 [May 21, 2007] Add png_snprintf() function and use it in place of sprint() for improved defense against buffer overflows. -version 1.2.19beta5 [May 21, 2007] +Version 1.2.19beta5 [May 21, 2007] Fixed png_handle_tRNS() to only use the valid bits of tRNS value. Changed handling of more unused parameters, to avoid compiler warnings. Removed some PNG_CONST in pngwutil.c to avoid compiler warnings. -version 1.2.19beta6 [May 22, 2007] +Version 1.2.19beta6 [May 22, 2007] Added some #ifdef PNG_MMX_CODE_SUPPORTED where needed in pngvcrd.c Added a special "_MSC_VER" case that defines png_snprintf to _snprintf -version 1.2.19beta7 [May 22, 2007] +Version 1.2.19beta7 [May 22, 2007] Squelched png_squelch_warnings() in pnggccrd.c and added an #ifdef PNG_MMX_CODE_SUPPORTED block around the declarations that caused the warnings that png_squelch_warnings was squelching. -version 1.2.19beta8 [May 22, 2007] +Version 1.2.19beta8 [May 22, 2007] Removed __MMX__ from test in pngconf.h. -version 1.2.19beta9 [May 23, 2007] +Version 1.2.19beta9 [May 23, 2007] Made png_squelch_warnings() available via PNG_SQUELCH_WARNINGS macro. Revised png_squelch_warnings() so it might work. Updated makefile.sgcc and makefile.solaris; added makefile.solaris-x86. -version 1.2.19beta10 [May 24, 2007] +Version 1.2.19beta10 [May 24, 2007] Resquelched png_squelch_warnings(), use "__attribute__((used))" instead. -version 1.4.0beta1 [April 20, 2006] +Version 1.4.0beta1 [April 20, 2006] Enabled iTXt support (changes png_struct, thus requires so-number change). Cleaned up PNG_ASSEMBLER_CODE_SUPPORTED vs PNG_MMX_CODE_SUPPORTED Eliminated PNG_1_0_X and PNG_1_2_X macros. @@ -1786,12 +1943,12 @@ version 1.4.0beta1 [April 20, 2006] Reduced dependency on C-runtime library when on Windows (Simon-Pierre) Replaced sprintf() with png_sprintf() (Simon-Pierre) -version 1.4.0beta2 [April 20, 2006] +Version 1.4.0beta2 [April 20, 2006] Revised makefiles and configure to avoid making links to libpng.so.* Moved some leftover MMX-related defines from pngconf.h to pngintrn.h Updated scripts/pngos2.def, pngw32.def, and projects/wince/png32ce.def -version 1.4.0beta3 [May 10, 2006] +Version 1.4.0beta3 [May 10, 2006] Updated scripts/pngw32.def to comment out MMX functions. Added PNG_NO_GET_INT_32 and PNG_NO_SAVE_INT_32 macros. Scripts/libpng.pc.in contained "configure" style version info and would @@ -1799,21 +1956,21 @@ version 1.4.0beta3 [May 10, 2006] Revised pngconf.h and added pngconf.h.in, so makefiles and configure can pass defines to libpng and applications. -version 1.4.0beta4 [May 11, 2006] +Version 1.4.0beta4 [May 11, 2006] Revised configure.ac, Makefile.am, and many of the makefiles to write their defines in pngconf.h. -version 1.4.0beta5 [May 15, 2006] +Version 1.4.0beta5 [May 15, 2006] Added a missing semicolon in Makefile.am and Makefile.in Deleted extraneous square brackets from configure.ac -version 1.4.0beta6 [June 2, 2006] +Version 1.4.0beta6 [June 2, 2006] Increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid buffer overflow. Changed sonum from 0 to 1. Removed unused prototype for png_check_sig() from png.h -version 1.4.0beta7 [June 16, 2006] +Version 1.4.0beta7 [June 16, 2006] Exported png_write_sig (Cosmin). Optimized buffer in png_handle_cHRM() (Cosmin). Set pHYs = 2835 x 2835 pixels per meter, and added @@ -1822,11 +1979,11 @@ version 1.4.0beta7 [June 16, 2006] Added typedef for png_int_32 and png_uint_32 on 64-bit systems. Added "(unsigned long)" typecast on png_uint_32 variables in printf lists. -version 1.4.0beta8 [June 22, 2006] +Version 1.4.0beta8 [June 22, 2006] Added demonstration of user chunk support in pngtest.c, to support the public sTER chunk and a private vpAg chunk. -version 1.4.0beta9 [July 3, 2006] +Version 1.4.0beta9 [July 3, 2006] Removed ordinals from scripts/pngw32.def and removed png_info_int and png_set_gray_1_2_4_to_8 entries. Inline call of png_get_uint_32() in png_get_uint_31(). @@ -1834,14 +1991,14 @@ version 1.4.0beta9 [July 3, 2006] Removed WINCE and Netware projects. Removed standalone Y2KINFO file. -version 1.4.0beta10 [July 12, 2006] +Version 1.4.0beta10 [July 12, 2006] Eliminated automatic copy of pngconf.h to pngconf.h.in from configure and some makefiles, because it was not working reliably. Instead, distribute pngconf.h.in along with pngconf.h and cause configure and some of the makefiles to update pngconf.h from pngconf.h.in. Added pngconf.h to DEPENDENCIES in Makefile.am -version 1.4.0beta11 [August 19, 2006] +Version 1.4.0beta11 [August 19, 2006] Removed AC_FUNC_MALLOC from configure.ac. Added a warning when writing iCCP profile with mismatched profile length. Patched pnggccrd.c to assemble on x86_64 platforms. @@ -1886,41 +2043,41 @@ version 1.4.0beta11 [August 19, 2006] pngconf.h.in (Glenn). Detect and fix attempt to write wrong iCCP profile length. -version 1.4.0beta12 [October 19, 2006] +Version 1.4.0beta12 [October 19, 2006] Changed "logical" to "bitwise" in the documentation. Work around Intel-Mac compiler bug by setting PNG_NO_MMX_CODE in pngconf.h Add a typecast to stifle compiler warning in pngrutil.c -version 1.4.0beta13 [November 10, 2006] +Version 1.4.0beta13 [November 10, 2006] Fix potential buffer overflow in sPLT chunk handler. Fix Makefile.am to not try to link to noexistent files. -version 1.4.0beta14 [November 15, 2006] +Version 1.4.0beta14 [November 15, 2006] Check all exported functions for NULL png_ptr. -version 1.4.0beta15 [November 17, 2006] +Version 1.4.0beta15 [November 17, 2006] Relocated two misplaced tests for NULL png_ptr. Built Makefile.in with automake-1.9.6 instead of 1.9.2. Build configure with autoconf-2.60 instead of 2.59 Add "install: all" in Makefile.am so "configure; make install" will work. -version 1.4.0beta16 [November 17, 2006] +Version 1.4.0beta16 [November 17, 2006] Added a typecast in png_zalloc(). -version 1.4.0beta17 [December 4, 2006] +Version 1.4.0beta17 [December 4, 2006] Changed "new_key[79] = '\0';" to "(*new_key)[79] = '\0';" in pngwutil.c Add "png_bytep" typecast to profile while calculating length in pngwutil.c -version 1.4.0beta18 [December 7, 2006] +Version 1.4.0beta18 [December 7, 2006] Added scripts/CMakeLists.txt -version 1.4.0beta19 [May 16, 2007] +Version 1.4.0beta19 [May 16, 2007] Revised scripts/CMakeLists.txt Rebuilt configure and Makefile.in with newer tools. Added conditional #undef jmpbuf in pngtest.c to undo #define in AIX headers. Added scripts/makefile.nommx -version 1.4.0beta20 [July 9, 2008] +Version 1.4.0beta20 [July 9, 2008] Moved several PNG_HAVE_* macros from pngpriv.h to png.h because applications calling set_unknown_chunk_location() need them. Moved several macro definitions from pngpriv.h to pngconf.h @@ -1928,19 +2085,19 @@ version 1.4.0beta20 [July 9, 2008] Deleted all use of the MMX assembler code and Intel-licensed optimizations. Revised makefile.mingw -version 1.4.0beta21 [July 21, 2008] +Version 1.4.0beta21 [July 21, 2008] Moved local array "chunkdata" from pngrutil.c to the png_struct, so it will be freed by png_read_destroy() in case of a read error (Kurt Christensen). -version 1.4.0beta22 [July 21, 2008] +Version 1.4.0beta22 [July 21, 2008] Change "purpose" and "buffer" to png_ptr->chunkdata to avoid memory leaking. -version 1.4.0beta23 [July 22, 2008] +Version 1.4.0beta23 [July 22, 2008] Change "chunkdata = NULL" to "png_ptr->chunkdata = NULL" several places in png_decompress_chunk(). -version 1.4.0beta24 [July 25, 2008] +Version 1.4.0beta24 [July 25, 2008] Change all remaining "chunkdata" to "png_ptr->chunkdata" in png_decompress_chunk(), and remove "chunkdata" from parameter list. Put a call to png_check_chunk_name() in png_read_chunk_header(). @@ -1948,7 +2105,7 @@ version 1.4.0beta24 [July 25, 2008] Removed two calls to png_check_chunk_name() occuring later in the process. Define PNG_NO_ERROR_NUMBERS by default in pngconf.h -version 1.4.0beta25 [July 30, 2008] +Version 1.4.0beta25 [July 30, 2008] Added a call to png_check_chunk_name() in pngpread.c Reverted png_check_chunk_name() to accept a name with a lowercase 3rd byte. Added png_push_have_buffer() function to pngpread.c @@ -1959,7 +2116,7 @@ version 1.4.0beta25 [July 30, 2008] Eliminated no-longer-used pngdefs.h (but it's still built in the makefiles) Relocated a misplaced "#endif /* PNG_NO_WRITE_FILTER */" in pngwutil.c -version 1.4.0beta26 [August 4, 2008] +Version 1.4.0beta26 [August 4, 2008] Removed png_push_have_buffer() function in pngpread.c. It increased the compiled library size slightly. Changed "-Wall" to "-W -Wall" in the CFLAGS in all makefiles (Cosmin Truta) @@ -1967,105 +2124,105 @@ version 1.4.0beta26 [August 4, 2008] Updated contrib/visupng/cexcept.h to version 2.0.1 Added PNG_LITERAL_CHARACTER macros for #, [, and ]. -version 1.4.0beta27 [August 5, 2008] +Version 1.4.0beta27 [August 5, 2008] Revised usage of PNG_LITERAL_SHARP in pngerror.c. Moved newline character from individual png_debug messages into the png_debug macros. Allow user to #define their own png_debug, png_debug1, and png_debug2. -version 1.4.0beta28 [August 5, 2008] +Version 1.4.0beta28 [August 5, 2008] Revised usage of PNG_LITERAL_SHARP in pngerror.c. Added PNG_STRING_NEWLINE macro -version 1.4.0beta29 [August 9, 2008] +Version 1.4.0beta29 [August 9, 2008] Revised usage of PNG_STRING_NEWLINE to work on non-ISO compilers. Added PNG_STRING_COPYRIGHT macro. Added non-ISO versions of png_debug macros. -version 1.4.0beta30 [August 14, 2008] +Version 1.4.0beta30 [August 14, 2008] Added premultiplied alpha feature (Volker Wiendl). -version 1.4.0beta31 [August 18, 2008] +Version 1.4.0beta31 [August 18, 2008] Moved png_set_premultiply_alpha from pngtrans.c to pngrtran.c Removed extra crc check at the end of png_handle_cHRM(). Bug introduced in libpng-1.4.0beta20. -version 1.4.0beta32 [August 19, 2008] +Version 1.4.0beta32 [August 19, 2008] Added PNG_WRITE_FLUSH_SUPPORTED block around new png_flush() call. Revised PNG_NO_STDIO version of png_write_flush() -version 1.4.0beta33 [August 20, 2008] +Version 1.4.0beta33 [August 20, 2008] Added png_get|set_chunk_cache_max() to limit the total number of sPLT, text, and unknown chunks that can be stored. -version 1.4.0beta34 [September 6, 2008] +Version 1.4.0beta34 [September 6, 2008] Shortened tIME_string to 29 bytes in pngtest.c Fixed off-by-one error introduced in png_push_read_zTXt() function in libpng-1.2.30beta04/pngpread.c (Harald van Dijk) -version 1.4.0beta35 [October 6, 2008] +Version 1.4.0beta35 [October 6, 2008] Changed "trans_values" to "trans_color". Changed so-number from 0 to 14. Some OS do not like 0. Revised makefile.darwin to fix shared library numbering. Change png_set_gray_1_2_4_to_8() to png_set_expand_gray_1_2_4_to_8() in example.c (debian bug report) -version 1.4.0beta36 [October 25, 2008] +Version 1.4.0beta36 [October 25, 2008] Sync with tEXt vulnerability fix in libpng-1.2.33rc02. -version 1.4.0beta37 [November 13, 2008] +Version 1.4.0beta37 [November 13, 2008] Added png_check_cHRM in png.c and moved checking from pngget.c, pngrutil.c, and pngwrite.c -version 1.4.0beta38 [November 22, 2008] +Version 1.4.0beta38 [November 22, 2008] Added check for zero-area RGB cHRM triangle in png_check_cHRM() and png_check_cHRM_fixed(). -version 1.4.0beta39 [November 23, 2008] +Version 1.4.0beta39 [November 23, 2008] Revised png_warning() to write its message on standard output by default when warning_fn is NULL. -version 1.4.0beta40 [November 24, 2008] +Version 1.4.0beta40 [November 24, 2008] Eliminated png_check_cHRM(). Instead, always use png_check_cHRM_fixed(). In png_check_cHRM_fixed(), ensure white_y is > 0, and removed redundant check for all-zero coordinates that is detected by the triangle check. -version 1.4.0beta41 [November 26, 2008] +Version 1.4.0beta41 [November 26, 2008] Fixed string vs pointer-to-string error in png_check_keyword(). Rearranged test expressions in png_check_cHRM_fixed() to avoid internal overflows. Added PNG_NO_CHECK_cHRM conditional. -version 1.4.0beta42, 43 [December 1, 2008] +Version 1.4.0beta42, 43 [December 1, 2008] Merge png_debug with version 1.2.34beta04. -version 1.4.0beta44 [December 6, 2008] +Version 1.4.0beta44 [December 6, 2008] Removed redundant check for key==NULL before calling png_check_keyword() to ensure that new_key gets initialized and removed extra warning (Merge with version 1.2.34beta05 -- Arvan Pritchard). -version 1.4.0beta45 [December 9, 2008] +Version 1.4.0beta45 [December 9, 2008] In png_write_png(), respect the placement of the filler bytes in an earlier call to png_set_filler() (Jim Barry). -version 1.4.0beta46 [December 10, 2008] +Version 1.4.0beta46 [December 10, 2008] Undid previous change and added PNG_TRANSFORM_STRIP_FILLER_BEFORE and PNG_TRANSFORM_STRIP_FILLER_AFTER conditionals and deprecated PNG_TRANSFORM_STRIP_FILLER (Jim Barry). -version 1.4.0beta47 [December 15, 2008] +Version 1.4.0beta47 [December 15, 2008] Support for dithering was disabled by default, because it has never been well tested and doesn't work very well. The code has not been removed, however, and can be enabled by building libpng with PNG_READ_DITHER_SUPPORTED defined. -version 1.4.0beta48 [February 14, 2009] +Version 1.4.0beta48 [February 14, 2009] Added new exported function png_calloc(). Combined several instances of png_malloc(); png_memset() into png_calloc(). Removed prototype for png_freeptr() that was added in libpng-1.4.0beta24 but was never defined. -version 1.4.0beta49 [February 28, 2009] +Version 1.4.0beta49 [February 28, 2009] Added png_fileno() macro to pngconf.h, used in pngwio.c Corrected order of #ifdef's in png_debug definition in png.h Fixed bug introduced in libpng-1.4.0beta48 with the memset arguments @@ -2074,7 +2231,7 @@ version 1.4.0beta49 [February 28, 2009] (bug introduced in libpng-1.2.34/1.4.0beta29). Revised comments in png_set_read_fn() and png_set_write_fn(). -version 1.4.0beta50 [March 18, 2009] +Version 1.4.0beta50 [March 18, 2009] Use png_calloc() instead of png_malloc() to allocate big_row_buf when reading an interlaced file, to avoid a possible UMR. Undid revision of PNG_NO_STDIO version of png_write_flush(). Users @@ -2085,21 +2242,21 @@ version 1.4.0beta50 [March 18, 2009] Removed fflush() from pngtest.c. Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h -version 1.4.0beta51 [March 21, 2009] +Version 1.4.0beta51 [March 21, 2009] Removed new png_fileno() macro from pngconf.h . -version 1.4.0beta52 [March 27, 2009] +Version 1.4.0beta52 [March 27, 2009] Relocated png_do_chop() ahead of building gamma tables in pngrtran.c This avoids building 16-bit gamma tables unnecessarily. Removed fflush() from pngtest.c. Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h Added a section on differences between 1.0.x and 1.2.x to libpng.3/libpng.txt -version 1.4.0beta53 [April 1, 2009] +Version 1.4.0beta53 [April 1, 2009] Removed some remaining MMX macros from pngpriv.h Fixed potential memory leak of "new_name" in png_write_iCCP() (Ralph Giles) -version 1.4.0beta54 [April 13, 2009] +Version 1.4.0beta54 [April 13, 2009] Added "ifndef PNG_SKIP_SETJMP_CHECK" block in pngconf.h to allow application code writers to bypass the check for multiple inclusion of setjmp.h when they know that it is safe to ignore the situation. @@ -2108,54 +2265,54 @@ version 1.4.0beta54 [April 13, 2009] pngtest now produces, and made some cosmetic changes to pngtest output. Eliminated deprecated png_read_init_3() and png_write_init_3() functions. -version 1.4.0beta55 [April 15, 2009] +Version 1.4.0beta55 [April 15, 2009] Simplified error handling in pngread.c and pngwrite.c by putting the new png_read_cleanup() and png_write_cleanup() functions inline. -version 1.4.0beta56 [April 25, 2009] +Version 1.4.0beta56 [April 25, 2009] Renamed "user_chunk_data" to "my_user_chunk_data" in pngtest.c to suppress "shadowed declaration" warning from gcc-4.3.3. Renamed "gamma" to "png_gamma" in pngset.c to avoid "shadowed declaration" warning about a global "gamma" variable in math.h on some platforms. -version 1.4.0beta57 [May 2, 2009] +Version 1.4.0beta57 [May 2, 2009] Removed prototype for png_freeptr() that was added in libpng-1.4.0beta24 but was never defined (again). Rebuilt configure scripts with autoconf-2.63 instead of 2.62 Removed pngprefs.h and MMX from makefiles -version 1.4.0beta58 [May 14, 2009] +Version 1.4.0beta58 [May 14, 2009] Changed pngw32.def to pngwin.def in makefile.mingw (typo was introduced in beta57). Clarified usage of sig_bit versus sig_bit_p in example.c (Vincent Torri) -version 1.4.0beta59 [May 15, 2009] +Version 1.4.0beta59 [May 15, 2009] Reformated sources in libpng style (3-space intentation, comment format) Fixed typo in libpng docs (PNG_FILTER_AVE should be PNG_FILTER_AVG) Added sections about the git repository and our coding style to the documentation Relocated misplaced #endif in pngwrite.c, sCAL chunk handler. -version 1.4.0beta60 [May 19, 2009] +Version 1.4.0beta60 [May 19, 2009] Conditionally compile png_read_finish_row() which is not used by progressive readers. Added contrib/pngminim/preader to demonstrate building minimal progressive decoder, based on contrib/gregbook with embedded libpng and zlib. -version 1.4.0beta61 [May 20, 2009] +Version 1.4.0beta61 [May 20, 2009] In contrib/pngminim/*, renamed "makefile.std" to "makefile", since there is only one makefile in those directories, and revised the README files accordingly. More reformatting of comments, mostly to capitalize sentences. -version 1.4.0beta62 [June 2, 2009] +Version 1.4.0beta62 [June 2, 2009] Added "#define PNG_NO_WRITE_SWAP" to contrib/pngminim/encoder/pngusr.h and "define PNG_NO_READ_SWAP" to decoder/pngusr.h and preader/pngusr.h Reformatted several remaining "else statement" into two lines. Added a section to the libpng documentation about using png_get_io_ptr() in configure scripts to detect the presence of libpng. -version 1.4.0beta63 [June 15, 2009] +Version 1.4.0beta63 [June 15, 2009] Revised libpng*.txt and libpng.3 to mention calling png_set_IHDR() multiple times and to specify the sample order in the tRNS chunk, because the ISO PNG specification has a typo in the tRNS table. @@ -2165,26 +2322,26 @@ version 1.4.0beta63 [June 15, 2009] Adopted preference for consistent use of "#ifdef" and "#ifndef" versus "#if defined()" and "if !defined()" where possible. -version 1.4.0beta64 [June 24, 2009] +Version 1.4.0beta64 [June 24, 2009] Eliminated PNG_LEGACY_SUPPORTED code. Moved the various unknown chunk macro definitions outside of the PNG_READ|WRITE_ANCILLARY_CHUNK_SUPPORTED blocks. -version 1.4.0beta65 [June 26, 2009] +Version 1.4.0beta65 [June 26, 2009] Added a reference to the libpng license in each file. -version 1.4.0beta66 [June 27, 2009] +Version 1.4.0beta66 [June 27, 2009] Refer to the libpng license instead of the libpng license in each file. -version 1.4.0beta67 [July 6, 2009] +Version 1.4.0beta67 [July 6, 2009] Relocated INVERT_ALPHA within png_read_png() and png_write_png(). Added high-level API transform PNG_TRANSFORM_GRAY_TO_RGB. Added an "xcode" project to the projects directory (Alam Arias). -version 1.4.0beta68 [July 19, 2009] +Version 1.4.0beta68 [July 19, 2009] Avoid some tests in filter selection in pngwutil.c -version 1.4.0beta69 [July 25, 2009] +Version 1.4.0beta69 [July 25, 2009] Simplified the new filter-selection test. This runs faster in the common "PNG_ALL_FILTERS" and PNG_FILTER_NONE cases. Removed extraneous declaration from the new call to png_read_gray_to_rgb() @@ -2192,54 +2349,54 @@ version 1.4.0beta69 [July 25, 2009] Fixed up xcode project (Alam Arias) Added a prototype for png_64bit_product() in png.c -version 1.4.0beta70 [July 27, 2009] +Version 1.4.0beta70 [July 27, 2009] Avoid a possible NULL dereference in debug build, in png_set_text_2(). (bug introduced in libpng-0.95, discovered by Evan Rouault) -version 1.4.0beta71 [July 29, 2009] +Version 1.4.0beta71 [July 29, 2009] Rebuilt configure scripts with autoconf-2.64. -version 1.4.0beta72 [August 1, 2009] +Version 1.4.0beta72 [August 1, 2009] Replaced *.tar.lzma with *.tar.xz in distribution. Get the xz codec from . -version 1.4.0beta73 [August 1, 2009] +Version 1.4.0beta73 [August 1, 2009] Reject attempt to write iCCP chunk with negative embedded profile length - (JD Chen) + (JD Chen) (CVE-2009-5063). -version 1.4.0beta74 [August 8, 2009] +Version 1.4.0beta74 [August 8, 2009] Changed png_ptr and info_ptr member "trans" to "trans_alpha". -version 1.4.0beta75 [August 21, 2009] +Version 1.4.0beta75 [August 21, 2009] Removed an extra png_debug() recently added to png_write_find_filter(). Fixed incorrect #ifdef in pngset.c regarding unknown chunk support. -version 1.4.0beta76 [August 22, 2009] +Version 1.4.0beta76 [August 22, 2009] Moved an incorrectly located test in png_read_row() in pngread.c -version 1.4.0beta77 [August 27, 2009] +Version 1.4.0beta77 [August 27, 2009] Removed lpXYZ.tar.bz2 (with CRLF), KNOWNBUG, libpng-x.y.z-KNOWNBUG.txt, and the "noconfig" files from the distribution. Moved CMakeLists.txt from scripts into the main libpng directory. Various bugfixes and improvements to CMakeLists.txt (Philip Lowman) -version 1.4.0beta78 [August 31, 2009] +Version 1.4.0beta78 [August 31, 2009] Converted all PNG_NO_* tests to PNG_*_SUPPORTED everywhere except pngconf.h Eliminated PNG_NO_FREE_ME and PNG_FREE_ME_SUPPORTED macros. Use png_malloc plus a loop instead of png_calloc() to initialize row_pointers in png_read_png(). -version 1.4.0beta79 [September 1, 2009] +Version 1.4.0beta79 [September 1, 2009] Eliminated PNG_GLOBAL_ARRAYS and PNG_LOCAL_ARRAYS; always use local arrays. Eliminated PNG_CALLOC_SUPPORTED macro and always provide png_calloc(). -version 1.4.0beta80 [September 17, 2009] +Version 1.4.0beta80 [September 17, 2009] Removed scripts/libpng.icc Changed typecast of filler from png_byte to png_uint_16 in png_set_filler(). (Dennis Gustafsson) Fixed typo introduced in beta78 in pngtest.c ("#if def " should be "#ifdef ") -version 1.4.0beta81 [September 23, 2009] +Version 1.4.0beta81 [September 23, 2009] Eliminated unused PNG_FLAG_FREE_* defines from pngpriv.h Expanded TAB characters in pngrtran.c Removed PNG_CONST from all "PNG_CONST PNG_CHNK" declarations to avoid @@ -2247,60 +2404,60 @@ version 1.4.0beta81 [September 23, 2009] Changed all "#if [!]defined(X)" to "if[n]def X" where possible. Eliminated unused png_ptr->row_buf_size -version 1.4.0beta82 [September 25, 2009] +Version 1.4.0beta82 [September 25, 2009] Moved redundant IHDR checking into new png_check_IHDR() in png.c and report all errors found in the IHDR data. Eliminated useless call to png_check_cHRM() from pngset.c -version 1.4.0beta83 [September 25, 2009] +Version 1.4.0beta83 [September 25, 2009] Revised png_check_IHDR() to eliminate bogus complaint about filter_type. -version 1.4.0beta84 [September 30, 2009] +Version 1.4.0beta84 [September 30, 2009] Fixed some inconsistent indentation in pngconf.h Revised png_check_IHDR() to add a test for width variable less than 32-bit. -version 1.4.0beta85 [October 1, 2009] +Version 1.4.0beta85 [October 1, 2009] Revised png_check_IHDR() again, to check info_ptr members instead of the contents of the returned parameters. -version 1.4.0beta86 [October 9, 2009] +Version 1.4.0beta86 [October 9, 2009] Updated the "xcode" project (Alam Arias). Eliminated a shadowed declaration of "pp" in png_handle_sPLT(). -version 1.4.0rc01 [October 19, 2009] +Version 1.4.0rc01 [October 19, 2009] Trivial cosmetic changes. -version 1.4.0beta87 [October 30, 2009] +Version 1.4.0beta87 [October 30, 2009] Moved version 1.4.0 back into beta. -version 1.4.0beta88 [October 30, 2009] +Version 1.4.0beta88 [October 30, 2009] Revised libpng*.txt section about differences between 1.2.x and 1.4.0 because most of the new features have now been ported back to 1.2.41 -version 1.4.0beta89 [November 1, 2009] +Version 1.4.0beta89 [November 1, 2009] More bugfixes and improvements to CMakeLists.txt (Philip Lowman) Removed a harmless extra png_set_invert_alpha() from pngwrite.c Apply png_user_chunk_cache_max within png_decompress_chunk(). Merged libpng-1.2.41.txt with libpng-1.4.0.txt where appropriate. -version 1.4.0beta90 [November 2, 2009] +Version 1.4.0beta90 [November 2, 2009] Removed all remaining WIN32_WCE #ifdefs except those involving the time.h "tm" structure -version 1.4.0beta91 [November 3, 2009] +Version 1.4.0beta91 [November 3, 2009] Updated scripts/pngw32.def and projects/wince/png32ce.def Copied projects/wince/png32ce.def to the scripts directory. Added scripts/makefile.wce Patched ltmain.sh for wince support. Added PNG_CONVERT_tIME_SUPPORTED macro. -version 1.4.0beta92 [November 4, 2009] +Version 1.4.0beta92 [November 4, 2009] Make inclusion of time.h in pngconf.h depend on PNG_CONVERT_tIME_SUPPORTED Make #define PNG_CONVERT_tIME_SUPPORTED depend on PNG_WRITE_tIME_SUPPORTED Revised libpng*.txt to describe differences from 1.2.40 to 1.4.0 (instead of differences from 1.2.41 to 1.4.0) -version 1.4.0beta93 [November 7, 2009] +Version 1.4.0beta93 [November 7, 2009] Added PNG_DEPSTRUCT, PNG_DEPRECATED, PNG_USE_RESULT, PNG_NORETURN, and PNG_ALLOCATED macros to detect deprecated direct access to the png_struct or info_struct members and other deprecated usage in @@ -2323,13 +2480,13 @@ version 1.4.0beta93 [November 7, 2009] Moved the synopsis lines for png_read_destroy(), png_write_destroy() png_debug(), png_debug1(), and png_debug2() from libpng.3 to libpngpf.3. -version 1.4.0beta94 [November 9, 2009] +Version 1.4.0beta94 [November 9, 2009] Removed the obsolete, unused pnggccrd.c and pngvcrd.c files. Updated CMakeLists.txt to add "-DPNG_CONFIGURE_LIBPNG" to the definitions. Removed dependency of pngtest.o on pngpriv.h in the makefiles. Only #define PNG_DEPSTRUCT, etc. in pngconf.h if not already defined. -version 1.4.0beta95 [November 10, 2009] +Version 1.4.0beta95 [November 10, 2009] Changed png_check_sig() to !png_sig_cmp() in contrib programs. Added -DPNG_CONFIGURE_LIBPNG to contrib/pngminm/*/makefile Changed png_check_sig() to !png_sig_cmp() in contrib programs. @@ -2337,7 +2494,7 @@ version 1.4.0beta95 [November 10, 2009] Changed pngminim/*/gather.sh to stop trying to remove pnggccrd.c and pngvcrd.c Added dependency on pngpriv.h in contrib/pngminim/*/makefile -version 1.4.0beta96 [November 12, 2009] +Version 1.4.0beta96 [November 12, 2009] Renamed scripts/makefile.wce to scripts/makefile.cegcc Revised Makefile.am to use libpng.sys while building libpng.so so that only PNG_EXPORT functions are exported. @@ -2347,42 +2504,42 @@ version 1.4.0beta96 [November 12, 2009] (evidently the same change made in libpng-1.0beta54 was lost). Added PNG_PRIVATE macro definition in pngconf.h for possible future use. -version 1.4.0beta97 [November 13, 2009] +Version 1.4.0beta97 [November 13, 2009] Restored pngtest.png to the libpng-1.4.0beta7 version. Removed projects/beos and netware.txt; no one seems to be supporting them. Revised Makefile.in -version 1.4.0beta98 [November 13, 2009] +Version 1.4.0beta98 [November 13, 2009] Added the "xcode" project to zip distributions, Fixed a typo in scripts/pngwin.def introduced in beta97. -version 1.4.0beta99 [November 14, 2009] +Version 1.4.0beta99 [November 14, 2009] Moved libpng-config.in and libpng.pc-configure.in out of the scripts directory, to libpng-config.in and libpng-pc.in, respectively, and modified Makefile.am and configure.ac accordingly. Now "configure" needs nothing from the "scripts" directory. Avoid redefining PNG_CONST in pngconf.h -version 1.4.0beta100 [November 14, 2009] +Version 1.4.0beta100 [November 14, 2009] Removed ASM builds from projects/visualc6 and projects/visualc71 Removed scripts/makefile.nommx and makefile.vcawin32 Revised CMakeLists.txt to account for new location of libpng-config.in and libpng-pc.in Updated INSTALL to reflect removal and relocation of files. -version 1.4.0beta101 [November 14, 2009] +Version 1.4.0beta101 [November 14, 2009] Restored the binary files (*.jpg, *.png, some project files) that were accidentally deleted from the zip and 7z distributions when the xcode project was added. -version 1.4.0beta102 [November 18, 2009] +Version 1.4.0beta102 [November 18, 2009] Added libpng-config.in and libpng-pc.in to the zip and 7z distributions. Fixed a typo in projects/visualc6/pngtest.dsp, introduced in beta100. Moved descriptions of makefiles and other scripts out of INSTALL into scripts/README.txt Updated the copyright year in scripts/pngwin.rc from 2006 to 2009. -version 1.4.0beta103 [November 21, 2009] +Version 1.4.0beta103 [November 21, 2009] Removed obsolete comments about ASM from projects/visualc71/README_zlib.txt Align row_buf on 16-byte boundary in memory. Restored the PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED guard around the call @@ -2394,74 +2551,74 @@ version 1.4.0beta103 [November 21, 2009] jmp_buf buffer, and marked direct access to jmpbuf 'deprecated'. (John Bowler) -version 1.4.0beta104 [November 22, 2009] +Version 1.4.0beta104 [November 22, 2009] Removed png_longjmp_ptr from scripts/*.def and libpng.3 Rebuilt configure scripts with autoconf-2.65 -version 1.4.0beta105 [November 25, 2009] +Version 1.4.0beta105 [November 25, 2009] Use fast integer PNG_DIVIDE_BY_255() or PNG_DIVIDE_BY_65535() to accomplish alpha premultiplication when PNG_READ_COMPOSITE_NODIV_SUPPORTED is defined. Changed "/255" to "/255.0" in background calculations to make it clear that the 255 is used as a double. -version 1.4.0beta106 [November 27, 2009] +Version 1.4.0beta106 [November 27, 2009] Removed premultiplied alpha feature. -version 1.4.0beta107 [December 4, 2009] +Version 1.4.0beta107 [December 4, 2009] Updated README Added "#define PNG_NO_PEDANTIC_WARNINGS" in the libpng source files. Removed "-DPNG_CONFIGURE_LIBPNG" from the makefiles and projects. Revised scripts/makefile.netbsd, makefile.openbsd, and makefile.sco to put png.h and pngconf.h in $prefix/include, like the other scripts, instead of in $prefix/include/libpng. Also revised makefile.sco - to put them in $prefix/include/libpng14 instead of in - $prefix/include/libpng/libpng14. + to put them in $prefix/include/libpng15 instead of in + $prefix/include/libpng/libpng15. -version 1.4.0beta108 [December 11, 2009] +Version 1.4.0beta108 [December 11, 2009] Removed leftover "-DPNG_CONFIGURE_LIBPNG" from contrib/pngminim/*/makefile Relocated png_do_chop() to its original position in pngrtran.c; the change in version 1.2.41beta08 caused transparency to be handled wrong in some 16-bit datastreams (Yusaku Sugai). -version 1.4.0beta109 [December 13, 2009] +Version 1.4.0beta109 [December 13, 2009] Added "bit_depth" parameter to the private png_build_gamma_table() function. Pass bit_depth=8 to png_build_gamma_table() when bit_depth is 16 but the PNG_16_TO_8 transform has been set, to avoid unnecessary build of 16-bit tables. -version 1.4.0rc02 [December 20, 2009] +Version 1.4.0rc02 [December 20, 2009] Declared png_cleanup_needed "volatile" in pngread.c and pngwrite.c -version 1.4.0rc03 [December 22, 2009] +Version 1.4.0rc03 [December 22, 2009] Renamed libpng-pc.in back to libpng.pc.in and revised CMakeLists.txt (revising the change in 1.4.0beta99) -version 1.4.0rc04 [December 25, 2009] +Version 1.4.0rc04 [December 25, 2009] Swapped PNG_UNKNOWN_CHUNKS_SUPPORTED and PNG_HANDLE_AS_UNKNOWN_SUPPORTED in pngset.c to be consistent with other changes in version 1.2.38. -version 1.4.0rc05 [December 25, 2009] +Version 1.4.0rc05 [December 25, 2009] Changed "libpng-pc.in" to "libpng.pc.in" in configure.ac, configure, and Makefile.in to be consistent with changes in libpng-1.4.0rc03 -version 1.4.0rc06 [December 29, 2009] +Version 1.4.0rc06 [December 29, 2009] Reverted the gamma_table changes from libpng-1.4.0beta109. Fixed some indentation errors. -version 1.4.0rc07 [January 1, 2010] +Version 1.4.0rc07 [January 1, 2010] Revised libpng*.txt and libpng.3 about 1.2.x->1.4.x differences. Use png_calloc() instead of png_malloc(); png_memset() in pngrutil.c Update copyright year to 2010. -version 1.4.0rc08 [January 2, 2010] +Version 1.4.0rc08 [January 2, 2010] Avoid deprecated references to png_ptr-io_ptr and png_ptr->error_ptr in pngtest.c -version 1.4.0 [January 3, 2010] +Version 1.4.0 [January 3, 2010] No changes. -version 1.4.1beta01 [January 8, 2010] +Version 1.4.1beta01 [January 8, 2010] Updated CMakeLists.txt for consistent indentation and to avoid an unclosed if-statement warning (Philip Lowman). Revised Makefile.am and Makefile.in to remove references to Y2KINFO, @@ -2473,28 +2630,28 @@ version 1.4.1beta01 [January 8, 2010] Revised Makefile.am and Makefile.in to simplify their maintenance. Revised scripts/makefile.linux to install a link to libpng14.so.14.1 -version 1.4.1beta02 [January 9, 2010] +Version 1.4.1beta02 [January 9, 2010] Revised the rest of the makefiles to install a link to libpng14.so.14.1 -version 1.4.1beta03 [January 10, 2010] +Version 1.4.1beta03 [January 10, 2010] Removed png_set_premultiply_alpha() from scripts/*.def -version 1.4.1rc01 [January 16, 2010] +Version 1.4.1rc01 [January 16, 2010] No changes. -version 1.4.1beta04 [January 23, 2010] +Version 1.4.1beta04 [January 23, 2010] Revised png_decompress_chunk() to improve speed and memory usage when decoding large chunks. Added png_set|get_chunk_malloc_max() functions. -version 1.4.1beta05 [January 26, 2010] +Version 1.4.1beta05 [January 26, 2010] Relocated "int k" declaration in pngtest.c to minimize its scope. -version 1.4.1beta06 [January 28, 2010] +Version 1.4.1beta06 [January 28, 2010] Revised png_decompress_chunk() to use a two-pass method suggested by John Bowler. -version 1.4.1beta07 [February 6, 2010] +Version 1.4.1beta07 [February 6, 2010] Folded some long lines in the source files. Added defineable PNG_USER_CHUNK_CACHE_MAX, PNG_USER_CHUNK_MALLOC_MAX, and a PNG_USER_LIMITS_SUPPORTED flag. @@ -2502,217 +2659,428 @@ version 1.4.1beta07 [February 6, 2010] png_ptr->png_user_chunk_malloc_max. Revised png_push_save_buffer() to do fewer but larger png_malloc() calls. -version 1.4.1beta08 [February 6, 2010] +Version 1.4.1beta08 [February 6, 2010] Minor cleanup and updating of dates and copyright year. -version 1.4.1beta09 [February 7, 2010] +Version 1.5.0beta01 [February 7, 2010] + Moved declaration of png_struct into private pngstruct.h and png_info + into pnginfo.h + +Version 1.4.1beta09 and 1.5.0beta02 [February 7, 2010] Reverted to original png_push_save_buffer() code. -version 1.4.1beta10 [February 9, 2010] - Return allocated "old_buffer" in png_push_save_buffer() before calling - png_error(), to avoid a potential memory leak. +Version 1.4.1beta10 and 1.5.0beta03 [February 8, 2010] + Return allocated "old_buffer" in png_push_save_buffer() before + calling png_error(), to avoid a potential memory leak. + Updated configure script to use SO number 15. -version 1.4.1beta11 [February 12, 2010] - Relocated misplaced closing curley bracket in png_decompress_chunk(). - Removed unused "buffer_size" variable from png_decompress_chunk(). +Version 1.5.0beta04 [February 9, 2010] + Removed malformed "incomplete struct declaration" of png_info from png.h + +Version 1.5.0beta05 [February 12, 2010] + Removed PNG_DEPSTRUCT markup in pngstruct.h and pnginfo.h, and undid the + linewrapping that it entailed. + Revised comments in pngstruct.h and pnginfo.h and added pointers to + the libpng license. + Changed PNG_INTERNAL to PNG_EXPOSE_INTERNAL_STRUCTURES Removed the cbuilder5 project, which has not been updated to 1.4.0. - Complete rewrite of two-pass png_decompress_chunk() by John Bowler. -version 1.4.1beta12 [February 14, 2010] - Fixed type declaration of png_get_user_malloc_max() in pngget.c (Daisuke +Version 1.4.1beta12 and 1.5.0beta06 [February 14, 2010] + Fixed type declaration of png_get_chunk_malloc_max() in pngget.c (Daisuke Nishikawa) -version 1.4.1rc02 [January 18, 2010] - No changes. +Version 1.5.0beta07 [omitted] -version 1.4.1rc03 [February 19, 2010] +Version 1.5.0beta08 [February 19, 2010] + Changed #ifdef PNG_NO_STDIO_SUPPORTED to #ifdef PNG_NO_CONSOLE_IO_SUPPORTED + wherever png_snprintf() is used to construct error and warning messages. Noted in scripts/makefile.mingw that it expects to be run under MSYS. Removed obsolete unused MMX-querying support from contrib/gregbook + Added exported png_longjmp() function. Removed the AIX redefinition of jmpbuf in png.h - Define _ALL_SOURCE in configure.ac, makefile.aix, and CMakeLists.txt - when using AIX compiler. + Added -D_ALLSOURCE in configure.ac, makefile.aix, and CMakeLists.txt + when building on AIX. -version 1.4.1rc04 [February 19, 2010] +Version 1.5.0beta09 [February 19, 2010] + Removed -D_ALLSOURCE from configure.ac, makefile.aix, and CMakeLists.txt. + Changed the name of png_ptr->jmpbuf to png_ptr->png_jmpbuf in pngstruct.h + +Version 1.5.0beta10 [February 25, 2010] Removed unused gzio.c from contrib/pngminim gather and makefile scripts + Removed replacement error handlers from contrib/gregbook. Because of + the new png_longjmp() function they are no longer needed. -version 1.4.1 [February 25, 2010] +Version 1.5.0beta11 [March 6, 2010] + Removed checking for already-included setjmp.h from pngconf.h + Fixed inconsistent indentations and made numerous cosmetic changes. + Revised the "SEE ALSO" style of libpng.3, libpngpf.3, and png.5 -version 1.4.2beta01 [April 1, 2010] - Conditionally compile an "else" statement in png_decompress_chunk(). +Version 1.5.0beta12 [March 9, 2010] + Moved "#include png.h" inside pngpriv.h and removed "#include png.h" from + the source files, along with "#define PNG_EXPOSE_INTERNAL_STRUCTURES" + and "#define PNG_NO_PEDANTIC_WARNINGS" (John Bowler). + Created new pngdebug.h and moved debug definitions there. + +Version 1.5.0beta13 [March 10, 2010] + Protect pngstruct.h, pnginfo.h, and pngdebug.h from being included twice. + Revise the "#ifdef" blocks in png_inflate() so it will compile when neither + PNG_USER_CHUNK_MALLOC_MAX nor PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED + is defined. + Removed unused png_measure_compressed_chunk() from pngpriv.h and libpngpf.3 + Moved the 'config.h' support from pngconf.h to pngpriv.h + Removed PNGAPI from the png_longjmp_ptr typedef. + Eliminated dependence of pngtest.c on the private pngdebug.h file. + Make all png_debug macros into *unterminated* statements or + expressions (i.e. a trailing ';' must always be added) and correct + the format statements in various png_debug messages. + +Version 1.5.0beta14 [March 14, 2010] + Removed direct access to png_ptr->io_ptr from the Windows code in pngtest.c + Revised Makefile.am to account for recent additions and replacements. + Corrected CE and OS/2 DEF files (scripts/png*def) for symbols removed and + added ordinal numbers to the Windows DEF file and corrected the duplicated + ordinal numbers on CE symbols that are commented out. + Added back in export symbols that can be present in the Windows build but + are disabled by default. + PNG_EXPORT changed to include an 'ordinal' field for DEF file generation. + PNG_CALLBACK added to make callback definitions uniform. PNGAPI split + into PNGCAPI (base C form), PNGAPI (exports) and PNGCBAPI (callbacks), + and appropriate changes made to all files. Cygwin builds re-hinged to + allow procedure call standard changes and to remove the need for the DEF + file (fixes build on Cygwin). + Enabled 'attribute' warnings that are relevant to library APIs and callbacks. + Changed rules for generation of the various symbol files and added a new + rule for a DEF file (which is also added to the distribution). + Updated the symbol file generation to stop it adding spurious spaces + to EOL (coming from preprocessor macro expansion). Added a facility + to join tokens in the output and rewrite *.dfn to use this. + Eliminated scripts/*.def in favor of libpng.def; updated projects/visualc71 + and removed scripts/makefile.cygwin. + Made PNG_BUILD_DLL safe: it can be set whenever a DLL is being built. + Removed the include of sys/types.h - apparently unnecessary now on the + platforms on which it happened (all but Mac OS and RISC OS). + Moved the Mac OS test into pngpriv.h (the only place it is used.) + +Version 1.5.0beta15 [March 17, 2010] + Added symbols.chk target to Makefile.am to validate the symbols in png.h + against the new DEF file scripts/symbols.def. + Changed the default DEF file back to pngwin.def. + Removed makefile.mingw. + Eliminated PNG_NO_EXTERN and PNG_ALL_EXTERN + +Version 1.5.0beta16 [April 1, 2010] + Make png_text_struct independent of PNG_iTXt_SUPPORTED, so that + fields are initialized in all configurations. The READ/WRITE + macros (PNG_(READ|WRITE)_iTXt_SUPPORTED) still function as + before to disable code to actually read or write iTXt chunks + and iTXt_SUPPORTED can be used to detect presence of either + read or write support (but it is probably better to check for + the one actually required - read or write.) + Combined multiple png_warning() calls for a single error. Restored the macro definition of png_check_sig(). -version 1.4.2rc01 [April 10, 2010] - No changes. - -version 1.4.2rc02 [April 16, 2010] +Version 1.5.0beta17 [April 17, 2010] + Added some "(long)" typecasts to printf calls in png_handle_cHRM(). Documented the fact that png_set_dither() was disabled since libpng-1.4.0. Reenabled png_set_dither() but renamed it to png_set_quantize() to reflect more accurately what it actually does. At the same time, renamed the PNG_DITHER_[RED,GREEN_BLUE]_BITS macros to PNG_QUANTIZE_[RED,GREEN,BLUE]_BITS. - -version 1.4.2rc03 [April 24, 2010] Added some "(long)" typecasts to printf calls in png_handle_cHRM(). + Freeze build-time only configuration in the build. + In all prior versions of libpng most configuration options + controlled by compiler #defines had to be repeated by the + application code that used libpng. This patch changes this + so that compilation options that can only be changed at build + time are frozen in the build. Options that are compiler + dependent (and those that are system dependent) are evaluated + each time - pngconf.h holds these. Options that can be changed + per-file in the application are in png.h. Frozen options are + in the new installed header file pnglibconf.h (John Bowler) + Removed the xcode project because it has not been updated to work + with libpng-1.5.0. + Removed the ability to include optional pngusr.h + +Version 1.5.0beta18 [April 17, 2010] + Restored the ability to include optional pngusr.h + Moved replacements for png_error() and png_warning() from the + contrib/pngminim project to pngerror.c, for use when warnings or + errors are disabled via PNG_NO_WARN or PNG_NO_ERROR_TEXT, to avoid + storing unneeded error/warning text. + Updated contrib/pngminim project to work with the new pnglibconf.h + Added some PNG_NO_* defines to contrib/pngminim/*/pngusr.h to save space. + +Version 1.5.0beta19 [April 24, 2010] + Added PNG_{READ,WRITE}_INT_FUNCTIONS_SUPPORTED. This allows the functions + to read and write ints to be disabled independently of PNG_USE_READ_MACROS, + which allows libpng to be built with the functions even though the default + is to use the macros - this allows applications to choose at app build + time whether or not to use macros (previously impossible because the + functions weren't in the default build.) + Changed Windows calling convention back to __cdecl for API functions. + For Windows/x86 platforms only: + __stdcall is no longer needed for Visual Basic, so libpng-1.5.0 uses + __cdecl throughout (both API functions and callbacks) on Windows/x86 + platforms. + Replaced visualc6 and visualc71 projects with new vstudio project Relaxed the overly-restrictive permissions of some files. -version 1.4.2rc04 [April 28, 2010] - Added the "vstudio" project to replace "visualc6" and "visualc71" which - will be removed from libpng-1.5.0. - Demonstrate in example.c that lang_key should be initialized. +Version 1.5.0beta20 [April 24, 2010] + Relaxed more overly-restrictive permissions of some files. + +Version 1.5.0beta21 [April 27, 2010] + Removed some unwanted binary bytes and changed CRLF to NEWLINE in the new + vstudio project files, and some trivial editing of some files in the + scripts directory. Set PNG_NO_READ_BGR, PNG_NO_IO_STATE, and PNG_NO_TIME_RFC1123 in contrib/pngminim/decoder/pngusr.h to make a smaller decoder application. -version 1.4.2rc05 [April 29, 2010] - Include png_reset_zstream() in png.c only when PNG_READ_SUPPORTED is defined. - Removed dummy_inflate.c and uncompr.c from contrib/pngminim/encoder +Version 1.5.0beta22 [April 28, 2010] + Fixed dependencies of GET_INT_32 - it does not require READ_INT_FUNCTIONS + because it has a macro equivalent. + Improved the options.awk script; added an "everything off" option. + Revised contrib/pngminim to use the "everything off" option in pngusr.dfa. + +Version 1.5.0beta23 [April 29, 2010] + Corrected PNG_REMOVED macro to take five arguments. + The macro was documented with two arguments (name,ordinal), however + the symbol checking .dfn files assumed five arguments. The five + argument form seems more useful so it is changed to that. Corrected PNG_UNKNOWN_CHUNKS_SUPPORTED to PNG_HANDLE_AS_UNKNOWN_SUPPORTED in gregbook/readpng2.c Corrected protection of png_get_user_transform_ptr. The API declaration in png.h is removed if both READ and WRITE USER_TRANSFORM are turned off but was left defined in pngtrans.c + Added logunsupported=1 to cause pnglibconf.h to document disabled options. + This makes the installed pnglibconf.h more readable but causes no + other change. The intention is that users of libpng will find it + easier to understand if an API they need is missing. + Include png_reset_zstream() in png.c only when PNG_READ_SUPPORTED is defined. + Removed dummy_inflate.c from contrib/pngminim/encoder + Removed contrib/pngminim/*/gather.sh; gathering is now done in the makefile. -version 1.4.2rc06 [May 3, 2010] - Moved declarations of umsg[] inside the proper #ifdef blocks in pngrutil.c +Version 1.5.0beta24 [May 7, 2010] + Use bitwise "&" instead of arithmetic mod in pngrutil.c calculation of the + offset of the png_ptr->rowbuf pointer into png_ptr->big_row_buf. + Added more blank lines for readability. -version 1.4.2 [May 6, 2010] - -version 1.4.3beta01 [June 18, 2010] - Added missing quotation marks in the aix block of configure.ac - The new "vstudio" project was missing from the zip and 7z distributions. +Version 1.5.0beta25 [June 18, 2010] In pngpread.c: png_push_have_row() add check for new_row > height - -version 1.4.3beta02 [June 18, 2010] Removed the now-redundant check for out-of-bounds new_row from example.c -version 1.4.3beta03 [June 18, 2010] - In pngpread.c: png_push_finish_row() add check for too many rows. - -version 1.4.3beta04 [June 19, 2010] +Version 1.5.0beta26 [June 18, 2010] In pngpread.c: png_push_process_row() add check for too many rows. - Removed the checks added in beta01 and beta03, as they are now redundant. -version 1.4.3beta05 [June 20, 2010] +Version 1.5.0beta27 [June 18, 2010] + Removed the check added in beta25 as it is now redundant. + +Version 1.5.0beta28 [June 20, 2010] Rewrote png_process_IDAT_data to consistently treat extra data as warnings and handle end conditions more cleanly. - Removed the new (beta04) check in png_push_process_row(). + Removed the new (beta26) check in png_push_process_row(). -version 1.4.3rc01 [June 21, 2010] - Revised some comments in png_process_IDAT_data(). +Version 1.5.0beta29 [June 21, 2010] + Revised scripts/options.awk to work on Sunos (but still doesn't work) + Added comment to options.awk and contrib/pngminim/*/makefile to try nawk. -version 1.4.3rc02 [June 22, 2010] - Changed char *msg to PNG_CONST char *msg in pngrutil.c +Version 1.5.0beta30 [June 22, 2010] Stop memory leak when reading a malformed sCAL chunk. + +Version 1.5.0beta31 [June 26, 2010] + Revised pngpread.c patch of beta28 to avoid an endless loop. Removed some trailing blanks. -version 1.4.3rc03 [June 23, 2010] - Revised pngpread.c patch of beta05 to avoid an endless loop. +Version 1.5.0beta32 [June 26, 2010] + Removed leftover scripts/options.patch and scripts/options.rej -version 1.4.3 [June 26, 2010] - Updated some of the "last changed" dates. - -version 1.4.4beta01 [July 12, 2010] - Removed extraneous new_push_process_row.c file. - Revised the "SEE ALSO" style of libpng.3, libpngpf.3, and png.5 - Removed some newly-added TAB characters from pngpread.c. - Fixed some indentation in pngpread.c and pngrutil.c +Version 1.5.0beta33 [July 6, 3010] + Made FIXED and FLOATING options consistent in the APIs they enable and + disable. Corrected scripts/options.awk to handle both command line + options and options specified in the .dfa files. + Changed char *msg to PNG_CONST char *msg in pngrutil.c + Make png_set_sRGB_gAMA_and_cHRM set values using either the fixed or + floating point APIs, but not both. + Reversed patch to remove error handler when the jmp_buf is stored in the + main program structure, not the png_struct. + The error handler is needed because the default handler in libpng will + always use the jmp_buf in the library control structure; this is never + set. The gregbook code is a useful example because, even though it + uses setjmp/longjmp, it shows how error handling can be implemented + using control mechanisms not directly supported by libpng. The + technique will work correctly with mechanisms such as Microsoft + Structure Exceptions or C++ exceptions (compiler willing - note that gcc + does not by default support interworking of C and C++ error handling.) + Reverted changes to call png_longjmp in contrib/gregbook where it is not + appropriate. If mainprog->jmpbuf is used by setjmp, then png_longjmp + cannot be used. Changed "extern PNG_EXPORT" to "PNG_EXPORT" in png.h (Jan Nijtmans) Changed "extern" to "PNG_EXTERN" in pngpriv.h (except for the 'extern "C" {') - Put "#ifndef PNG_EXTERN, #endif" around "#define PNG_EXTERN" in pngpriv.h -version 1.4.4beta02 [July 24, 2010] +Version 1.5.0beta34 [July 12, 2010] + Put #ifndef PNG_EXTERN, #endif around the define PNG_EXTERN in pngpriv.h + +Version 1.5.0beta35 [July 24, 2010] + Removed some newly-added TAB characters. Added -DNO_PNG_SNPRINTF to CFLAGS in scripts/makefile.dj2 Moved the definition of png_snprintf() outside of the enclosing #ifdef blocks in pngconf.h - Added a special case typedef of png_longjmp_ptr for WATCOM. -version 1.4.4beta03 [July 24, 2010] - Removed reference to cbuilder5/* from Makefile.in and Makefile.am - Eliminated the new special case typedef of png_longjmp_ptr for WATCOM - and made a special case "#define PNGAPI" in pngconf.h instead. +Version 1.5.0beta36 [July 29, 2010] + Patches by John Bowler: + Fixed point APIs are now supported throughout (no missing APIs). + Internal fixed point arithmetic support exists for all internal floating + point operations. + sCAL validates the floating point strings it is passed. + Safe, albeit rudimentary, Watcom support is provided by PNG_API_RULE==2 + Two new APIs exist to get the number of passes without turning on the + PNG_INTERLACE transform and to get the number of rows in the current + pass. + A new test program, pngvalid.c, validates the gamma code. + Errors in the 16-bit gamma correction (overflows) have been corrected. + cHRM chunk testing is done consistently (previously the floating point + API bypassed it, because the test really didn't work on FP, now the test + is performed on the actual values to be stored in the PNG file so it + works in the FP case too.) + Most floating point APIs now simply call the fixed point APIs after + converting the values to the fixed point form used in the PNG file. + The standard headers no longer include zlib.h, which is currently only + required for pngstruct.h and can therefore be internal. + Revised png_get_int_32 to undo the PNG two's complement representation of + negative numbers. -version 1.4.4beta04 [July 31, 2010] - Updated the read macros and functions from 1.5.0beta38. +Version 1.5.0beta37 [July 30, 2010] + Added a typecast in png_get_int_32() in png.h and pngrutil.h to avoid + a compiler warning. + Replaced oFFs 0,0 with oFFs -10,20 in pngtest.png -version 1.4.4beta05 [August 6, 2010] - Updated projects/visualc71 so it can find scripts/pnglibconf.h - Removed unused png_mem_* defines from pngconf.h. +Version 1.5.0beta38 [July 31, 2010] + Implemented remaining "_fixed" functions. + Corrected a number of recently introduced warnings mostly resulting from + safe but uncast assignments to shorter integers. Also added a zlib + VStudio release library project because the latest zlib Official Windows + build does not include such a thing. + Revised png_get_int_16() to be similar to png_get_int_32(). + Restored projects/visualc71. + +Version 1.5.0beta39 [August 2, 2010] + VisualC/GCC warning fixes, VisualC build fixes + The changes include support for function attributes in VC in addition to + those already present in GCC - necessary because without these some + warnings are unavoidable. Fixes include signed/unsigned fixes in + pngvalid and checks with gcc -Wall -Wextra -Wunused. + VC requires function attributes on function definitions as well as + declarations, PNG_FUNCTION has been added to enable this and the + relevant function definitions changed. + +Version 1.5.0beta40 [August 6, 2010] Correct use of _WINDOWS_ in pngconf.h + Removed png_mem_ #defines; they are no longer used. + Added the sRGB chunk to pngtest.png -version 1.4.4beta06 [August 11, 2010] +Version 1.5.0beta41 [August 11, 2010] + Added the cHRM chunk to pngtest.png Don't try to use version-script with cygwin/mingw. Revised contrib/gregbook to work under cygwin/mingw. -version 1.4.4beta07 [August 26, 2010] - Updated prebuilt aclocal.m4 and ltmain.sh +Version 1.5.0beta42 [August 18, 2010] Add .dll.a to the list of extensions to be symlinked by Makefile.am (Yaakov) + Made all API functions that have const arguments and constant string + literal pointers declare them (John Bowler). + +Version 1.5.0beta43 [August 20, 2010] + Removed spurious tabs, shorten long lines (no source change) + Also added scripts/chkfmt to validate the format of all the files that can + reasonably be validated (it is suggested to run "make distclean" before + checking, because some machine generated files have long lines.) + Reformatted the CHANGES file to be more consistent throughout. + Made changes to address various issues identified by GCC, mostly + signed/unsigned and shortening problems on assignment but also a few + difficult to optimize (for GCC) loops. + Fixed non-GCC fixed point builds. In png.c a declaration was misplaced + in an earlier update. Fixed to declare the auto variables at the head. + Use cexcept.h in pngvalid.c. + +Version 1.5.0beta44 [August 24, 2010] Updated CMakeLists.txt to use CMAKE_INSTALL_LIBDIR variable; useful for installing libpng in /usr/lib64 (Funda Wang). Revised CMakeLists.txt to put the man pages in share/man/man* not man/man* Revised CMakeLists.txt to make symlinks instead of copies when installing. Changed PNG_LIB_NAME from pngNN to libpngNN in CMakeLists.txt (Philip Lowman) - Moved "#include pngusr.h" ahead of PNG_USER_PRIVATEBUILD test in pngconf.h - Eliminated a deprecated reference to png_ptr->io_ptr in pngtest.c - Eliminated new unnecessary #if tests regarding the sCAL chunk from pngrutil.c + Implemented memory checks within pngvalid + Reformatted/rearranged pngvalid.c to assist use of progressive reader. + Check interlaced images in pngvalid + Clarified pngusr.h comments in pnglibconf.dfa + Simplified the pngvalid error-handling code now that cexcept.h is in place. + Implemented progressive reader in pngvalid.c for standard tests + Implemented progressive read in pngvalid.c gamma tests + Turn on progressive reader in pngvalid.c by default and tidy code. -version 1.4.4beta08 [September 2, 2010] - Updated the xcode project to work with libpng-1.4.x and added iOS targets - for simulator and device (Philippe Hausler). +Version 1.5.0beta45 [August 26, 2010] + Added an explicit make step to projects/vstudio for pnglibconf.h + Also corrected zlib.vcxproj into which Visual Studio had introduced + what it calls an "authoring error". The change to make pnglibconf.h + simply copies the file; in the future it may actually generate the + file from scripts/pnglibconf.dfa as the other build systems do. + Changed pngvalid to work when floating point APIs are disabled + Renamed the prebuilt scripts/pnglibconf.h to scripts/pnglibconf.h.prebuilt + Supply default values for PNG_USER_PRIVATEBUILD and PNG_USER_DLLFNAME_POSTFIX + in pngpriv.h in case the user neglected to define them in their pngusr.h -version 1.4.4rc01 [September 10, 2010] - No changes. +Version 1.5.0beta46 [August 28, 2010] + Added new private header files to libpng_sources in CMakeLists.txt + Added PNG_READ_16BIT, PNG_WRITE_16BIT, and PNG_16BIT options. + Added reference to scripts/pnglibconf.h.prebuilt in the visualc71 project. -version 1.4.4rc02 [September 13, 2010] - Revised CMakeLists.txt (Philip Lowman). +Version 1.5.0beta47 [September 11, 2010] + Fixed a number of problems with 64-bit compilation reported by Visual + Studio 2010 (John Bowler). -version 1.4.4rc03 [September 14, 2010] - Removed an extraneous close-double-quote from CMakeLists.txt - Eliminated another deprecated reference to png_ptr->io_ptr in pngtest.c - -version 1.4.4rc04 [September 16, 2010] - Fixed indentation and removed debugging message from CMakeLists.txt +Version 1.5.0beta48 [October 4, 2010] + Updated CMakeLists.txt (Philip Lowman). Revised autogen.sh to recognize and use $AUTOCONF, $AUTOMAKE, $AUTOHEADER, $AUTOPOINT, $ACLOCAL and $LIBTOOLIZE - -version 1.4.4rc05 [September 20, 2010] - Rebuilt configure scripts with automake-1.11.1 instead of automake-1.11. - Removed unused mkinstalldirs file. - -version 1.4.4 [September 23, 2010] - No changes. - -version 1.4.5beta01 [September 25, 2010] - Fixed possible configure.ac bug introduced in version 1.4.4rc05. - Rebuilt configure scripts with autoconf-2.68 instead of autoconf-2.65 - -version 1.4.5beta02 [October 5, 2010] - Reverted configure scripts to autoconf-2.65 Fixed problem with symbols creation in Makefile.am which was assuming that - all versions of cpp write to standard output by default (Martin Banky). The + all versions of ccp write to standard output by default (Martin Banky). The bug was introduced in libpng-1.2.9beta5. + Removed unused mkinstalldirs. -version 1.4.5beta03 [October 8, 2010] - Wrapped long lines in CMakeLists.txt and introduced ${libpng_public_hdrs} - Undid Makefile.am revision of 1.4.5beta02. +Version 1.5.0beta49 [October 8, 2010] + Undid Makefile.am revision of 1.5.0beta48. -version 1.4.5beta04 [November 8, 2010] +Version 1.5.0beta50 [October 14, 2010] + Revised Makefile.in to account for mkinstalldirs being removed. + Added some "(unsigned long)" typecasts in printf statements in pngvalid.c. + Suppressed a compiler warning in png_handle_sPLT(). Check for out-of-range text compression mode in png_set_text(). -version 1.4.5rc01 [November 19, 2010] - No changes. +Version 1.5.0beta51 [October 15, 2010] + Changed embedded dates to "(PENDING RELEASE) in beta releases (and future + rc releases) to minimize the difference between releases. -version 1.4.5beta05 [November 20, 2010] +Version 1.5.0beta52 [October 16, 2010] + Restored some of the embedded dates (in png.h, png.c, documentation, etc.) + +Version 1.5.0beta53 [October 18, 2010] + Updated INSTALL to mention using "make maintainer-clean" and to remove + obsolete statement about a custom ltmain.sh + Disabled "color-tests" by default in Makefile.am so it will work with + automake versions earlier than 1.11.1 + Use document name "libpng-manual.txt" instead of "libpng-.txt" + to simplify version differences. + Removed obsolete remarks about setjmp handling from INSTALL. + Revised and renamed the typedef in png.h and png.c that was designed + to catch library and header mismatch. + +Version 1.5.0beta54 [November 10, 2010] + Require 48 bytes, not 64 bytes, for big_row_buf in overflow checks. + Used a consistent structure for the pngget.c functions. + +Version 1.5.0beta55 [November 21, 2010] Revised png_get_uint_32, png_get_int_32, png_get_uint_16 (Cosmin) Moved reading of file signature into png_read_sig (Cosmin) Fixed atomicity of chunk header serialization (Cosmin) Added test for io_state in pngtest.c (Cosmin) Added "#!/bin/sh" at the top of contrib/pngminim/*/gather.sh scripts. - -version 1.4.5beta06 [November 21, 2010] - Restored the parentheses in pngrutil.c; they are needed when the - png_get_*int_*() functions are compiled (i.e., when PNG_USE_READ_MACROS - is not defined). - Make the "png_get_uint_16" macro return a png_uint_32 in libpng-1.4 for API - compatibility. Changes to remove gcc warnings (John Bowler) Certain optional gcc warning flags resulted in warnings in libpng code. With these changes only -Wconversion and -Wcast-qual cannot be turned on. @@ -2722,51 +3090,1561 @@ version 1.4.5beta06 [November 21, 2010] with pngwio.c and pngwutil.c because the 'write' callback and zlib compression both fail to declare their input buffers with 'const'. -version 1.4.5beta07 [November 25, 2010] - Reverted png_get_uint_16 macro to beta05 and added comment about the - potential API incompatibility. +Version 1.5.0beta56 [December 7, 2010] + Added the private PNG_UNUSED() macro definition in pngpriv.h. + Added some commentary about PNG_EXPORT in png.h and pngconf.h + Revised PNG_EXPORT() macro and added PNG_EXPORTA() macro, with the + objective of simplifying and improving the cosmetic appearance of png.h. + Fixed some incorrect "=" macro names in pnglibconf.dfa + Included documentation of changes in 1.5.0 from 1.4.x in libpng-manual.txt -version 1.4.5rc02 [December 2, 2010] +Version 1.5.0beta57 [December 9, 2010] + Documented the pngvalid gamma error summary with additional comments and + print statements. + Improved missing symbol handling in checksym.awk; symbols missing in both + the old and new files can now be optionally ignored, treated as errors + or warnings. + Removed references to pngvcrd.c and pnggccrd.c from the vstudio project. + Updated "libpng14" to "libpng15" in the visualc71 project. + Enabled the strip16 tests in pngvalid.` + Don't display test results (except PASS/FAIL) when running "make test". + Instead put them in pngtest-log.txt + Added "--with-zprefix=" to configure.ac + Updated the prebuilt configuration files to autoconf version 2.68 + +Version 1.5.0beta58 [December 19, 2010] + Fixed interlace image handling and add test cases (John Bowler) + Fixed the clean rule in Makefile.am to remove pngtest-log.txt + Made minor changes to work around warnings in gcc 3.4 + +Version 1.5.0rc01 [December 27, 2010] No changes. -version 1.4.5rc03 [December 3, 2010] - Added missing vstudio/*/*.vcxproj files to the zip and 7z distributions. +Version 1.5.0rc02 [December 27, 2010] + Eliminated references to the scripts/*.def files in project/visualc71. -version 1.4.5 [December 9, 2010] - Removed PNG_NO_WRITE_GAMMA from pngminim/encoder/pngusr.h +Version 1.5.0rc03 [December 28, 2010] + Eliminated scripts/*.def and revised Makefile.am accordingly -version 1.4.6beta01 [December 29, 2010] +Version 1.5.0rc04 [December 29, 2010] Fixed bug in background transformation handling in pngrtran.c (it was looking for the flag in png_ptr->transformations instead of in png_ptr->flags) (David Raymond). -version 1.4.6beta02 [January 14, 2011] - Fixed misspelled macros in contrib/pngminim (Cosmin). - Updated CMakeLists.txt (Clifford Yapp). +Version 1.5.0rc05 [December 31, 2010] + Fixed typo in a comment in CMakeLists.txt (libpng14 => libpng15) (Cosmin) -version 1.4.6beta03 [January 14, 2011] - Fixed some typecasts in png_debug statements (Cosmin). +Version 1.5.0rc06 [January 4, 2011] + Changed the new configure option "zprefix=string" to "zlib-prefix=string" -version 1.4.6beta04 [January 22, 2011] +Version 1.5.0rc07 [January 4, 2011] + Updated copyright year. + +Version 1.5.0 [January 6, 2011] + No changes. + +version 1.5.1beta01 [January 8, 2011] + Added description of png_set_crc_action() to the manual. + Added a note in the manual that the type of the iCCP profile was changed + from png_charpp to png_bytepp in png_get_iCCP(). This change happened + in version 1.5.0beta36 but is not noted in the CHANGES. Similarly, + it was changed from png_charpp to png_const_bytepp in png_set_iCCP(). + Ensure that png_rgb_to_gray ignores palette mapped images, if libpng + internally happens to call it with one, and fixed a failure to handle + palette mapped images correctly. This fixes CVE-2690. + +Version 1.5.1beta02 [January 14, 2011] + Fixed a bug in handling of interlaced images (bero at arklinux.org). + Updated CMakeLists.txt (Clifford Yapp) + +Version 1.5.1beta03 [January 14, 2011] + Fixed typecasting of some png_debug() statements (Cosmin) + +Version 1.5.1beta04 [January 16, 2011] Updated documentation of png_set|get_tRNS() (Thomas Klausner). - Added png_const_structp and png_const_infop types, and used them in - prototypes for most png_get_*() functions. + Mentioned in the documentation that applications must #include "zlib.h" + if they need access to anything in zlib.h, and that a number of + macros such as png_memset() are no longer accessible by applications. + Corrected pngvalid gamma test "sample" function to access all of the color + samples of each pixel, instead of sampling the red channel three times. + Prefixed variable names index, div, exp, gamma with "png_" to avoid "shadow" + warnings, and (mistakenly) changed png_exp() to exp(). + +Version 1.5.1beta05 [January 16, 2011] + Changed variable names png_index, png_div, png_exp, and png_gamma to + char_index, divisor, exp_b10, and gamma_val, respectively, and + changed exp() back to png_exp(). + +Version 1.5.1beta06 [January 20, 2011] + Prevent png_push_crc_skip() from hanging while reading an unknown chunk + or an over-large compressed zTXt chunk with the progressive reader. + Eliminated more GCC "shadow" warnings. + Revised png_fixed() in png.c to avoid compiler warning about reaching the + end without returning anything. + +Version 1.5.1beta07 [January 22, 2011] In the manual, describe the png_get_IHDR() arguments in the correct order. - Ported change in png_do_rgb_to_gray() from libpng-1.5.1, to make - it more robust against internal libpng coding errors. + Added const_png_structp and const_png_infop types, and used them in + prototypes for most png_get_*() functions. -version 1.4.6beta05 [January 23, 2011] +Version 1.5.1beta08 [January 23, 2011] + Added png_get_io_chunk_type() and deprecated png_get_io_chunk_name() + Added synopses for the IO_STATE functions and other missing synopses + to the manual. Removed the synopses from libpngpf.3 because they + were out of date and no longer useful. Better information can be + obtained by reading the prototypes and comments in pngpriv.h + Attempted to fix cpp on Solaris with S. Studio 12 cc, fix build + Added a make macro DFNCPP that is a CPP that will accept the tokens in + a .dfn file and adds configure stuff to test for such a CPP. ./configure + should fail if one is not available. + Corrected const_png_ in png.h to png_const_ to avoid polluting the namespace. + Added png_get_current_row_number and png_get_current_pass_number for the + benefit of the user transform callback. + Added png_process_data_pause and png_process_data_skip for the benefit of + progressive readers that need to stop data processing or want to optimize + skipping of unread data (e.g., if the reader marks a chunk to be skipped.) - Updated the synopses in the manual to reflect recent changes. - Fixed a typo in the *.def files and deleted entries that are now - declared in pngpriv.h +Version 1.5.1beta09 [January 24, 2011] + Enhanced pngvalid, corrected an error in gray_to_rgb, corrected doc error. + pngvalid contains tests of transforms, which tests are currently disabled + because they are incompletely tested. gray_to_rgb was failing to expand + the bit depth for smaller bit depth images; this seems to be a long + standing error and resulted, apparently, in invalid output + (CVE-2011-0408, CERT VU#643140). The documentation did not accurately + describe what libpng really does when converting RGB to gray. -version 1.4.6beta06 [January 23, 2011] +Version 1.5.1beta10 [January 27, 2010] + Fixed incorrect examples of callback prototypes in the manual, that were + introduced in libpng-1.0.0. + In addition the order of the png_get_uint macros with respect to the + relevant function definitions has been reversed. This helps the + preprocessing of the symbol files be more robust. Furthermore, the + symbol file preprocessing now uses -DPNG_NO_USE_READ_MACROS even when + the library may actually be built with PNG_USE_READ_MACROS; this stops + the read macros interfering with the symbol file format. + Made the manual, synopses, and function prototypes use the function + argument names file_gamma, int_file_gamma, and srgb_intent consistently. -Send comments/corrections/commendations to glennrp at users.sourceforge.net -or to png-mng-implement at lists.sf.net (subscription required; visit -https://lists.sourceforge.net/lists/listinfo/png-mng-implement). +Version 1.5.1beta11 [January 28, 2011] + Changed PNG_UNUSED from "param=param;" to "{if(param){}}". + Corrected local variable type in new API png_process_data_skip() + The type was self-evidently incorrect but only causes problems on 64-bit + architectures. + Added transform tests to pngvalid and simplified the arguments. + +Version 1.5.1rc01 [January 29, 2011] + No changes. + +Version 1.5.1rc02 [January 31, 2011] + Added a request in the manual that applications do not use "png_" or + "PNG_" to begin any of their own symbols. + Changed PNG_UNUSED to "(void)param;" and updated the commentary in pngpriv.h + +Version 1.5.1 [February 3, 2011] + No changes. + +Version 1.5.2beta01 [February 13, 2011] + More -Wshadow fixes for older gcc compilers. Older gcc versions apparently + check formal parameters names in function declarations (as well as + definitions) to see if they match a name in the global namespace. + Revised PNG_EXPORTA macro to not use an empty parameter, to accommodate the + old VisualC++ preprocessor. + Turned on interlace handling in png_read_png(). + Fixed gcc pendantic warnings. + Handle longjmp in Cygwin. + Fixed png_get_current_row_number() in the interlaced case. + Cleaned up ALPHA flags and transformations. + Implemented expansion to 16 bits. + +Version 1.5.2beta02 [February 19, 2011] + Fixed mistake in the descriptions of user read_transform and write_transform + function prototypes in the manual. The row_info struct is png_row_infop. + Reverted png_get_current_row_number() to previous (1.5.2beta01) behavior. + Corrected png_get_current_row_number documentation + Fixed the read/write row callback documentation. + This documents the current behavior, where the callback is called after + every row with information pertaining to the next row. + +Version 1.5.2beta03 [March 3, 2011] + Fixed scripts/makefile.vcwin32 + Updated contrib/pngsuite/README to add the word "modify". + Define PNG_ALLOCATED to blank when _MSC_VER<1300. + +Version 1.5.2rc01 [March 19, 2011] + Define remaining attributes to blank when MSC_VER<1300. + ifdef out mask arrays in pngread.c when interlacing is not supported. + +Version 1.5.2rc02 [March 22, 2011] + Added a hint to try CPP=/bin/cpp if "cpp -E" fails in scripts/pnglibconf.mak + and in contrib/pngminim/*/makefile, eg., on SunOS 5.10, and removed "strip" + from the makefiles. + Fixed a bug (present since libpng-1.0.7) that makes png_handle_sPLT() fail + to compile when PNG_NO_POINTER_INDEXING is defined (Chubanov Kirill) + +Version 1.5.2rc03 [March 24, 2011] + Don't include standard header files in png.h while building the symbol table, + to avoid cpp failure on SunOS (introduced PNG_BUILDING_SYMBOL_TABLE macro). + +Version 1.5.2 [March 31, 2011] + No changes. + +Version 1.5.3beta01 [April 1, 2011] + Re-initialize the zlib compressor before compressing non-IDAT chunks. + Added API functions (png_set_text_compression_level() and four others) to + set parameters for zlib compression of non-IDAT chunks. + +Version 1.5.3beta02 [April 3, 2011] + Updated scripts/symbols.def with new API functions. + Only compile the new zlib re-initializing code when text or iCCP is + supported, using PNG_WRITE_COMPRESSED_TEXT_SUPPORTED macro. + Improved the optimization of the zlib CMF byte (see libpng-1.2.6beta03). + Optimize the zlib CMF byte in non-IDAT compressed chunks + +Version 1.5.3beta03 [April 16, 2011] + Fixed gcc -ansi -pedantic compile. A strict ANSI system does not have + snprintf, and the "__STRICT_ANSI__" detects that condition more reliably + than __STDC__ (John Bowler). + Removed the PNG_PTR_NORETURN attribute because it too dangerous. It tells + the compiler that a user supplied callback (the error handler) does not + return, yet there is no guarantee in practice that the application code + will correctly implement the error handler because the compiler only + issues a warning if there is a mistake (John Bowler). + Removed the no-longer-used PNG_DEPSTRUCT macro. + Updated the zlib version to 1.2.5 in the VStudio project. + Fixed 64-bit builds where png_uint_32 is smaller than png_size_t in + pngwutil.c (John Bowler). + Fixed bug with stripping the filler or alpha channel when writing, that + was introduced in libpng-1.5.2beta01 (bug report by Andrew Church). + +Version 1.5.3beta04 [April 27, 2011] + Updated pngtest.png with the new zlib CMF optimization. + Cleaned up conditional compilation code and of background/gamma handling + Internal changes only except a new option to avoid compiling the + png_build_grayscale_palette API (which is not used at all internally.) + The main change is to move the transform tests (READ_TRANSFORMS, + WRITE_TRANSFORMS) up one level to the caller of the APIs. This avoids + calls to spurious functions if all transforms are disabled and slightly + simplifies those functions. Pngvalid modified to handle this. + A minor change is to stop the strip_16 and expand_16 interfaces from + disabling each other; this allows the future alpha premultiplication + code to use 16-bit intermediate values while still producing 8-bit output. + png_do_background and png_do_gamma have been simplified to take a single + pointer to the png_struct rather than pointers to every item required + from the png_struct. This makes no practical difference to the internal + code. + A serious bug in the pngvalid internal routine 'standard_display_init' has + been fixed - this failed to initialize the red channel and accidentally + initialized the alpha channel twice. + Changed png_struct jmp_buf member name from png_jmpbuf to tmp_jmpbuf to + avoid a possible clash with the png_jmpbuf macro on some platforms. + +Version 1.5.3beta05 [May 6, 2011] + Added the "_POSIX_SOURCE" feature test macro to ensure libpng sees the + correct API. _POSIX_SOURCE is defined in pngpriv.h, pngtest.c and + pngvalid.c to ensure that POSIX conformant systems disable non-POSIX APIs. + Removed png_snprintf and added formatted warning messages. This change adds + internal APIs to allow png_warning messages to have parameters without + requiring the host OS to implement snprintf. As a side effect the + dependency of the tIME-supporting RFC1132 code on stdio is removed and + PNG_NO_WARNINGS does actually work now. + Pass "" instead of '\0' to png_default_error() in png_err(). This mistake + was introduced in libpng-1.2.20beta01. This fixes CVE-2011-2691. + Added PNG_WRITE_OPTIMIZE_CMF_SUPPORTED macro to make the zlib "CMF" byte + optimization configureable. + IDAT compression failed if preceded by a compressed text chunk (bug + introduced in libpng-1.5.3beta01-02). This was because the attempt to + reset the zlib stream in png_write_IDAT happened after the first IDAT + chunk had been deflated - much too late. In this change internal + functions were added to claim/release the z_stream and, hopefully, make + the code more robust. Also deflateEnd checking is added - previously + libpng would ignore an error at the end of the stream. + +Version 1.5.3beta06 [May 8, 2011] + Removed the -D_ALL_SOURCE from definitions for AIX in CMakeLists.txt + Implemented premultiplied alpha support: png_set_alpha_mode API + +Version 1.5.3beta07 [May 11, 2011] + Added expand_16 support to the high level interface. + Added named value and 'flag' gamma support to png_set_gamma. Made a minor + change from the previous (unreleased) ABI/API to hide the exact value used + for Macs - it's not a good idea to embed this in the ABI! + Moved macro definitions for PNG_HAVE_IHDR, PNG_HAVE_PLTE, and PNG_AFTER_IDAT + from pngpriv.h to png.h because they must be visible to applications + that call png_set_unknown_chunks(). + Check for up->location !PNG_AFTER_IDAT when writing unknown chunks + before IDAT. + +Version 1.5.3beta08 [May 16, 2011] + Improved "pngvalid --speed" to exclude more of pngvalid from the time. + Documented png_set_alpha_mode(), other changes in libpng.3/libpng-manual.txt + The cHRM chunk now sets the defaults for png_set_rgb_to_gray() (when negative + parameters are supplied by the caller), while in the absence of cHRM + sRGB/Rec 709 values are still used. This introduced a divide-by-zero + bug in png_handle_cHRM(). + The bKGD chunk no longer overwrites the background value set by + png_set_background(), allowing the latter to be used before the file + header is read. It never performed any useful function to override + the default anyway. + Added memory overwrite and palette image checks to pngvalid.c + Previously palette image code was poorly checked. Since the transformation + code has a special palette path in most cases this was a severe weakness. + Minor cleanup and some extra checking in pngrutil.c and pngrtran.c. When + expanding an indexed image, always expand to RGBA if transparency is + present. + +Version 1.5.3beta09 [May 17, 2011] + Reversed earlier 1.5.3 change of transformation order; move png_expand_16 + back where it was. The change doesn't work because it requires 16-bit + gamma tables when the code only generates 8-bit ones. This fails + silently; the libpng code just doesn't do any gamma correction. Moving + the tests back leaves the old, inaccurate, 8-bit gamma calculations, but + these are clearly better than none! + +Version 1.5.3beta10 [May 20, 2011] + + png_set_background() and png_expand_16() did not work together correctly. + This problem is present in 1.5.2; if png_set_background is called with + need_expand false and the matching 16 bit color libpng erroneously just + treats it as an 8-bit color because of where png_do_expand_16 is in the + transform list. This simple fix reduces the supplied colour to 8-bits, + so it gets smashed, but this is better than the current behavior. + Added tests for expand16, more fixes for palette image tests to pngvalid. + Corrects the code for palette image tests and disables attempts to + validate palette colors. + +Version 1.5.3rc01 [June 3, 2011] + No changes. + +Version 1.5.3rc02 [June 8, 2011] + Fixed uninitialized memory read in png_format_buffer() (Bug report by + Frank Busse, CVE-2011-2501, related to CVE-2004-0421). + +Version 1.5.3beta11 [June 11, 2011] + Fixed png_handle_sCAL which is broken in 1.5. This fixes CVE 2011-2692. + Added sCAL to pngtest.png + Revised documentation about png_set_user_limits() to say that it also affects + png writing. + Revised handling of png_set_user_limits() so that it can increase the + limit beyond the PNG_USER_WIDTH|HEIGHT_MAX; previously it could only + reduce it. + Make the 16-to-8 scaling accurate. Dividing by 256 with no rounding is + wrong (high by one) 25% of the time. Dividing by 257 with rounding is + wrong in 128 out of 65536 cases. Getting the right answer all the time + without division is easy. + Added "_SUPPORTED" to the PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION macro. + Added projects/owatcom, an IDE project for OpenWatcom to replace + scripts/makefile.watcom. This project works with OpenWatcom 1.9. The + IDE autogenerates appropriate makefiles (libpng.mk) for batch processing. + The project is configurable, unlike the Visual Studio project, so long + as the developer has an awk. + Changed png_set_gAMA to limit the gamma value range so that the inverse + of the stored value cannot overflow the fixed point representation, + and changed other things OpenWatcom warns about. + Revised pngvalid.c to test PNG_ALPHA_MODE_SUPPORTED correctly. This allows + pngvalid to build when ALPHA_MODE is not supported, which is required if + it is to build on libpng 1.4. + Removed string/memory macros that are no longer used and are not + necessarily fully supportable, particularly png_strncpy and png_snprintf. + Added log option to pngvalid.c and attempted to improve gamma messages. + +Version 1.5.3 [omitted] + People found the presence of a beta release following an rc release + to be confusing; therefore we bump the version to libpng-1.5.4beta01 + and there will be no libpng-1.5.3 release. + +Version 1.5.4beta01 [June 14, 2011] + Made it possible to undefine PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED + to get the same (inaccurate) output as libpng-1.5.2 and earlier. + Moved definitions of PNG_HAVE_IHDR, PNG_AFTER_IDAT, and PNG_HAVE_PLTE + outside of an unknown-chunk block in png.h because they are also + needed for other uses. + +Version 1.5.4beta02 [June 14, 2011] + Fixed and clarified LEGACY 16-to-8 scaling code. + Added png_set_chop_16() API, to match inaccurate results from previous + libpng versions. + Removed the ACCURATE and LEGACY options (they are no longer useable) + Use the old scaling method for background if png_set_chop_16() was + called. + Made png_set_chop_16() API removeable by disabling PNG_CHOP_16_TO_8_SUPPORTED + +Version 1.5.4beta03 [June 15, 2011] + Fixed a problem in png_do_expand_palette() exposed by optimization in + 1.5.3beta06 + Also removed a spurious and confusing "trans" member ("trans") from png_info. + The palette expand optimization prevented expansion to an intermediate RGBA + form if tRNS was present but alpha was marked to be stripped; this exposed + a check for tRNS in png_do_expand_palette() which is inconsistent with the + code elsewhere in libpng. + Correction to the expand_16 code; removed extra instance of + png_set_scale_16_to_8 from pngpriv.h + +Version 1.5.4beta04 [June 16, 2011] + Added a missing "#ifdef PNG_READ_BACKGROUND_SUPPORTED/#endif" in pngrtran.c + Added PNG_TRANSFORM_CHOP_16 to the high-level read transforms. + Made PNG_READ_16_TO_8_ACCURATE_SCALE configurable again. If this is + not enabled, png_set_strip_16() and png_do_scale_16_to_8() aren't built. + Revised contrib/visupng, gregbook, and pngminim to demonstrate chop_16_to_8 + +Version 1.5.4beta05 [June 16, 2011] + Renamed png_set_strip_16() to png_set_scale_16() and renamed + png_set_chop_16() to png_set_strip(16) in an attempt to minimize the + behavior changes between libpng14 and libpng15. + +Version 1.5.4beta06 [June 18, 2011] + Fixed new bug that was causing both strip_16 and scale_16 to be applied. + +Version 1.5.4beta07 [June 19, 2011] + Fixed pngvalid, simplified macros, added checking for 0 in sCAL. + The ACCURATE scale macro is no longer defined in 1.5 - call the + png_scale_16_to_8 API. Made sure that PNG_READ_16_TO_8 is still defined + if the png_strip_16_to_8 API is present. png_check_fp_number now + maintains some state so that positive, negative and zero values are + identified. sCAL uses these to be strictly spec conformant. + +Version 1.5.4beta08 [June 23, 2011] + Fixed pngvalid if ACCURATE_SCALE is defined. + Updated scripts/pnglibconf.h.prebuilt. + +Version 1.5.4rc01 [June 30, 2011] + Define PNG_ALLOCATED to "restrict" only if MSC_VER >= 1400. + +Version 1.5.4 [July 7, 2011] + No changes. + +Version 1.5.5beta01 [July 13, 2011] + Fixed some typos and made other minor changes in the manual. + Updated contrib/pngminus/makefile.std (Samuli Souminen) + +Version 1.5.5beta02 [July 14, 2011] + Revised Makefile.am and Makefile.in to look in the right directory for + pnglibconf.h.prebuilt + +Version 1.5.5beta03 [July 27, 2011] + Enabled compilation with g++ compiler. This compiler does not recognize + the file extension, so it always compiles with C++ rules. Made minor + changes to pngrutil.c to cast results where C++ expects it but C does not. + Minor editing of libpng.3 and libpng-manual.txt. + +Version 1.5.5beta04 [July 29, 2011] + Revised CMakeLists.txt (Clifford Yapp) + Updated commentary about the png_rgb_to_gray() default coefficients + in the manual and in pngrtran.c + +Version 1.5.5beta05 [August 17, 2011] + Prevent unexpected API exports from non-libpng DLLs on Windows. The "_DLL" + is removed from the test of whether a DLL is being built (this erroneously + caused the libpng APIs to be marked as DLL exports in static builds under + Microsoft Visual Studio). Almost all of the libpng building configuration + is moved from pngconf.h to pngpriv.h, but PNG_DLL_EXPORT remains in + pngconf.h, though, so that it is colocated with the import definition (it + is no longer used anywhere in the installed headers). The VStudio project + definitions have been cleaned up: "_USRDLL" has been removed from the + static library builds (this was incorrect), and PNG_USE_DLL has been added + to pngvalid to test the functionality (pngtest does not supply it, + deliberately). The spurious "_EXPORTS" has been removed from the + libpng build (all these errors were a result of copy/paste between project + configurations.) + Added new types and internal functions for CIE RGB end point handling to + pngpriv.h (functions yet to be implemented). + +Version 1.5.5beta06 [August 26, 2011] + Ensure the CMAKE_LIBRARY_OUTPUT_DIRECTORY is set in CMakeLists.txt + (Clifford Yap) + Fixes to rgb_to_gray and cHRM XYZ APIs (John Bowler): + The rgb_to_gray code had errors when combined with gamma correction. + Some pixels were treated as true grey when they weren't and such pixels + and true grey ones were not gamma corrected (the original value of the + red component was used instead). APIs to get and set cHRM using color + space end points have been added and the rgb_to_gray code that defaults + based on cHRM, and the divide-by-zero bug in png_handle_cHRM (CERT + VU#477046, CVE-2011-3328, introduced in 1.5.4) have been corrected. + A considerable number of tests has been added to pngvalid for the + rgb_to_gray transform. + Arithmetic errors in rgb_to_gray whereby the calculated gray value was + truncated to the bit depth rather than rounded have been fixed except in + the 8-bit non-gamma-corrected case (where consistency seems more important + than correctness.) The code still has considerable inaccuracies in the + 8-bit case because 8-bit linear arithmetic is used. + +Version 1.5.5beta07 [September 7, 2011] + Added "$(ARCH)" option to makefile.darwin + Added SunOS support to configure.ac and Makefile.am + Changed png_chunk_benign_error() to png_warning() in png.c, in + png_XYZ_from_xy_checked(). + +Version 1.5.5beta08 [September 10, 2011] + Fixed 64-bit compilation errors (gcc). The errors fixed relate + to conditions where types that are 32 bits in the GCC 32-bit + world (uLong and png_size_t) become 64 bits in the 64-bit + world. This produces potential truncation errors which the + compiler correctly flags. + Relocated new HAVE_SOLARIS_LD definition in configure.ac + Constant changes for 64-bit compatibility (removal of L suffixes). The + 16-bit cases still use "L" as we don't have a 16-bit test system. + +Version 1.5.5rc01 [September 15, 2011] + Removed "L" suffixes in pngpriv.h + +Version 1.5.5 [September 22, 2011] + No changes. + +Version 1.5.6beta01 [September 22, 2011] + Fixed some 64-bit type conversion warnings in pngrtran.c + Moved row_info from png_struct to a local variable. + The various interlace mask arrays have been made into arrays of + bytes and made PNG_CONST and static (previously some arrays were + marked PNG_CONST and some weren't). + Additional checks have been added to the transform code to validate the + pixel depths after the transforms on both read and write. + Removed some redundant code from pngwrite.c, in png_destroy_write_struct(). + Changed chunk reading/writing code to use png_uint_32 instead of png_byte[4]. + This removes the need to allocate temporary strings for chunk names on + the stack in the read/write code. Unknown chunk handling still uses the + string form because this is exposed in the API. + +Version 1.5.6beta02 [September 26, 2011] + Added a note in the manual the png_read_update_info() must be called only + once with a particular info_ptr. + Fixed a typo in the definition of the new PNG_STRING_FROM_CHUNK(s,c) macro. + +Version 1.5.6beta03 [September 28, 2011] + Revised test-pngtest.sh to report FAIL when pngtest fails. + Added "--strict" option to pngtest, to report FAIL when the failure is + only because the resulting valid files are different. + Revised CMakeLists.txt to work with mingw and removed some material from + CMakeLists.txt that is no longer useful in libpng-1.5. + +Version 1.5.6beta04 [October 5, 2011] + Fixed typo in Makefile.in and Makefile.am ("-M Wl" should be "-M -Wl")." + +Version 1.5.6beta05 [October 12, 2011] + Speed up png_combine_row() for interlaced images. This reduces the generality + of the code, allowing it to be optimized for Adam7 interlace. The masks + passed to png_combine_row() are now generated internally, avoiding + some code duplication and localizing the interlace handling somewhat. + Align png_struct::row_buf - previously it was always unaligned, caused by + a bug in the code that attempted to align it; the code needs to subtract + one from the pointer to take account of the filter byte prepended to + each row. + Optimized png_combine_row() when rows are aligned. This gains a small + percentage for 16-bit and 32-bit pixels in the typical case where the + output row buffers are appropriately aligned. The optimization was not + previously possible because the png_struct buffer was always misaligned. + Fixed bug in png_write_chunk_header() debug print, introduced in 1.5.6beta01. + +Version 1.5.6beta06 [October 17, 2011] + Removed two redundant tests for unitialized row. + Fixed a relatively harmless memory overwrite in compressed text writing + with a 1 byte zlib buffer. + Add ability to call png_read_update_info multiple times to pngvalid.c. + Fixes for multiple calls to png_read_update_info. These fixes attend to + most of the errors revealed in pngvalid, however doing the gamma work + twice results in inaccuracies that can't be easily fixed. There is now + a warning in the code if this is going to happen. + Turned on multiple png_read_update_info in pngvalid transform tests. + Prevent libpng from overwriting unused bits at the end of the image when + it is not byte aligned, while reading. Prior to libpng-1.5.6 libpng would + overwrite the partial byte at the end of each row if the row width was not + an exact multiple of 8 bits and the image is not interlaced. + +Version 1.5.6beta07 [October 21, 2011] + Made png_ptr->prev_row an aligned pointer into png_ptr->big_prev_row + (Mans Rullgard). + +Version 1.5.6rc01 [October 26, 2011] + Changed misleading "Missing PLTE before cHRM" warning to "Out of place cHRM" + +Version 1.5.6rc02 [October 27, 2011] + Added LSR() macro to defend against buggy compilers that evaluate non-taken + code branches and complain about out-of-range shifts. + +Version 1.5.6rc03 [October 28, 2011] + Renamed the LSR() macro to PNG_LSR() and added PNG_LSL() macro. + Fixed compiler warnings with Intel and MSYS compilers. The logical shift + fix for Microsoft Visual C is required by other compilers, so this + enables that fix for all compilers when using compile-time constants. + Under MSYS 'byte' is a name declared in a system header file, so we + changed the name of a local variable to avoid the warnings that result. + Added #define PNG_ALIGN_TYPE PNG_ALIGN_NONE to contrib/pngminim/*/pngusr.h + +Version 1.5.6 [November 3, 2011] + No changes. + +Version 1.5.7beta01 [November 4, 2011] + Added support for ARM processor, when decoding all PNG up-filtered rows + and any other-filtered rows with 3 or 4 bytes per pixel (Mans Rullgard). + Fixed bug in pngvalid on early allocation failure; fixed type cast in + pngmem.c; pngvalid would attempt to call png_error() if the allocation + of a png_struct or png_info failed. This would probably have led to a + crash. The pngmem.c implementation of png_malloc() included a cast + to png_size_t which would fail on large allocations on 16-bit systems. + Fix for the preprocessor of the Intel C compiler. The preprocessor + splits adjacent @ signs with a space; this changes the concatentation + token from @-@-@ to PNG_JOIN; that should work with all compiler + preprocessors. + Paeth filter speed improvements from work by Siarhei Siamashka. This + changes the 'Paeth' reconstruction function to improve the GCC code + generation on x86. The changes are only part of the suggested ones; + just the changes that definitely improve speed and remain simple. + The changes also slightly increase the clarity of the code. + +Version 1.5.7beta02 [November 11, 2011] + Check compression_type parameter in png_get_iCCP and remove spurious + casts. The compression_type parameter is always assigned to, so must + be non-NULL. The cast of the profile length potentially truncated the + value unnecessarily on a 16-bit int system, so the cast of the (byte) + compression type to (int) is specified by ANSI-C anyway. + Fixed FP division by zero in pngvalid.c; the 'test_pixel' code left + the sBIT fields in the test pixel as 0, which resulted in a floating + point division by zero which was irrelevant but causes systems where + FP exceptions cause a crash. Added code to pngvalid to turn on FP + exceptions if the appropriate glibc support is there to ensure this is + tested in the future. + Updated scripts/pnglibconf.mak and scripts/makefile.std to handle the + new PNG_JOIN macro. + Added versioning to pnglibconf.h comments. + Simplified read/write API initial version; basic read/write tested on + a variety of images, limited documentation (in the header file.) + Installed more accurate linear to sRGB conversion tables. The slightly + modified tables reduce the number of 16-bit values that + convert to an off-by-one 8-bit value. The "makesRGB.c" code that was used + to generate the tables is now in a contrib/sRGBtables sub-directory. + +Version 1.5.7beta03 [November 17, 2011] + Removed PNG_CONST from the sRGB table declarations in pngpriv.h and png.c + Added run-time detection of NEON support. + Added contrib/libtests; includes simplified API test and timing test and + a color conversion utility for rapid checking of failed 'pngstest' results. + Multiple transform bug fixes plus a work-round for double gamma correction. + libpng does not support more than one transform that requires linear data + at once - if this is tried typically the results is double gamma + correction. Since the simplified APIs can need rgb to gray combined with + a compose operation it is necessary to do one of these outside the main + libpng transform code. This check-in also contains fixes to various bugs + in the simplified APIs themselves and to some bugs in compose and rgb to + gray (on palette) itself. + Fixes for C++ compilation using g++ When libpng source is compiled + using g++. The compiler imposes C++ rules on the C source; thus it + is desireable to make the source work with either C or C++ rules + without throwing away useful error information. This change adds + png_voidcast to allow C semantic (void*) cases or the corresponding + C++ static_cast operation, as appropriate. + Added --noexecstack to assembler file compilation. GCC does not set + this on assembler compilation, even though it does on C compilation. + This creates security issues if assembler code is enabled; the + work-around is to set it by default in the flags for $(CCAS) + Work around compilers that don't support declaration of const data. Some + compilers fault 'extern const' data declarations (because the data is + not initialized); this turns on const-ness only for compilers where + this is known to work. + +Version 1.5.7beta04 [November 17, 2011] + Since the gcc driver does not recognize the --noexecstack flag, we must + use the -Wa prefix to have it passed through to the assembler. + Also removed a duplicate setting of this flag. + Added files that were omitted from the libpng-1.5.7beta03 zip distribution. + +Version 1.5.7beta05 [November 25, 2011] + Removed "zTXt" from warning in generic chunk decompression function. + Validate time settings passed to pngset() and png_convert_to_rfc1123() + (Frank Busse). + Added MINGW support to CMakeLists.txt + Reject invalid compression flag or method when reading the iTXt chunk. + Backed out 'simplified' API changes. The API seems too complex and there + is a lack of consensus or enthusiasm for the proposals. The API also + reveals significant bugs inside libpng (double gamma correction and the + known bug of being unable to retrieve a corrected palette). It seems + better to wait until the bugs, at least, are corrected. + Moved pngvalid.c into contrib/libtests + Rebuilt Makefile.in, configure, etc., with autoconf-2.68 + +Version 1.5.7rc01 [December 1, 2011] + Replaced an "#if" with "#ifdef" in pngrtran.c + Revised #if PNG_DO_BC block in png.c (use #ifdef and add #else) + +Version 1.5.7rc02 [December 5, 2011] + Revised project files and contrib/pngvalid/pngvalid.c to account for + the relocation of pngvalid into contrib/libtests. + Revised pngconf.h to use " __declspec(restrict)" only when MSC_VER >= 1400, + as in libpng-1.5.4. + Put CRLF line endings in the owatcom project files. + +Version 1.5.7rc03 [December 7, 2011] + Updated CMakeLists.txt to account for the relocation of pngvalid.c + +Version 1.5.7 [December 15, 2011] + Minor fixes to pngvalid.c for gcc 4.6.2 compatibility to remove warnings + reported by earlier versions. + Fixed minor memset/sizeof errors in pngvalid.c. + +Version 1.6.0beta01 [December 15, 2011] + Removed machine-generated configure files from the GIT repository (they will + continue to appear in the tarball distributions and in the libpng15 and + earlier GIT branches). + Restored the new 'simplified' API, which was started in libpng-1.5.7beta02 + but later deleted from libpng-1.5.7beta05. + Added example programs for the new 'simplified' API. + Added ANSI-C (C90) headers and require them, and take advantage of the + change. Also fixed some of the projects/* and contrib/* files that needed + updates for libpng16 and the move of pngvalid.c. + With this change the required ANSI-C header files are assumed to exist: the + implementation must provide float.h, limits.h, stdarg.h and stddef.h and + libpng relies on limits.h and stddef.h existing and behaving as defined + (the other two required headers aren't used). Non-ANSI systems that don't + have stddef.h or limits.h will have to provide an appropriate fake + containing the relevant types and #defines. + The use of FAR/far has been eliminated and the definition of png_alloc_size_t + is now controlled by a flag so that 'small size_t' systems can select it + if necessary. Libpng 1.6 may not currently work on such systems -- it + seems likely that it will ask 'malloc' for more than 65535 bytes with any + image that has a sufficiently large row size (rather than simply failing + to read such images). + New tools directory containing tools used to generate libpng code. + Fixed race conditions in parallel make builds. With higher degrees of + parallelism during 'make' the use of the same temporary file names such + as 'dfn*' can result in a race where a temporary file from one arm of the + build is deleted or overwritten in another arm. This changes the + temporary files for suffix rules to always use $* and ensures that the + non-suffix rules use unique file names. + +Version 1.6.0beta02 [December 21, 2011] + Correct configure builds where build and source directories are separate. + The include path of 'config.h' was erroneously made relative in pngvalid.c + in libpng 1.5.7. + +Version 1.6.0beta03 [December 22, 2011] + Start-up code size improvements, error handler flexibility. These changes + alter how the tricky allocation of the initial png_struct and png_info + structures are handled. png_info is now handled in pretty much the same + way as everything else, except that the allocations handle NULL return + silently. png_struct is changed in a similar way on allocation and on + deallocation a 'safety' error handler is put in place (which should never + be required). The error handler itself is changed to permit mismatches + in the application and libpng error buffer size; however, this means a + silent change to the API to return the jmp_buf if the size doesn't match + the size from the libpng compilation; libpng now allocates the memory and + this may fail. Overall these changes result in slight code size + reductions; however, this is a reduction in code that is always executed + so is particularly valuable. Overall on a 64-bit system the libpng DLL + decreases in code size by 1733 bytes. pngerror.o increases in size by + about 465 bytes because of the new functionality. + Added png_convert_to_rfc1123_buffer() and deprecated png_convert_to_rfc1123() + to avoid including a spurious buffer in the png_struct. + +Version 1.6.0beta04 [December 30, 2011] + Regenerated configure scripts with automake-1.11.2 + Eliminated png_info_destroy(). It is now used only in png.c and only calls + one other internal function and memset(). + Enabled png_get_sCAL_fixed() if floating point APIs are enabled. Previously + it was disabled whenever internal fixed point arithmetic was selected, + which meant it didn't exist even on systems where FP was available but not + preferred. + Added pngvalid.c compile time checks for const APIs. + Implemented 'restrict' for png_info and png_struct. Because of the way + libpng works both png_info and png_struct are always accessed via a + single pointer. This means adding C99 'restrict' to the pointer gives + the compiler some opportunity to optimize the code. This change allows + that. + Moved AC_MSG_CHECKING([if libraries can be versioned]) later to the proper + location in configure.ac (Gilles Espinasse). + Changed png_memcpy to C assignment where appropriate. Changed all those + uses of png_memcpy that were doing a simple assignment to assignments + (all those cases where the thing being copied is a non-array C L-value). + Added some error checking to png_set_*() routines. + Removed the reference to the non-exported function png_memcpy() from + example.c. + Fixed the Visual C 64-bit build - it requires jmp_buf to be aligned, but + it had become misaligned. + Revised contrib/pngminus/pnm2png.c to avoid warnings when png_uint_32 + and unsigned long are of different sizes. + +Version 1.6.0beta05 [January 15, 2012] + Updated manual with description of the simplified API (copied from png.h) + Fix bug in pngerror.c: some long warnings were being improperly truncated + (CVE-2011-3464, bug introduced in libpng-1.5.3beta05). + +Version 1.6.0beta06 [January 24, 2012] + Added palette support to the simplified APIs. This commit + changes some of the macro definitions in png.h, app code + may need corresponding changes. + Increased the formatted warning buffer to 192 bytes. + Added color-map support to simplified API. This is an initial version for + review; the documentation has not yet been updated. + Fixed Min/GW uninstall to remove libpng.dll.a + +Version 1.6.0beta07 [January 28, 2012] + Eliminated Intel icc/icl compiler warnings. The Intel (GCC derived) + compiler issues slightly different warnings from those issued by the + current vesions of GCC. This eliminates those warnings by + adding/removing casts and small code rewrites. + Updated configure.ac from autoupdate: added --enable-werror option. + Also some layout regularization and removal of introduced tab characters + (replaced with 3-character indentation). Obsolete macros identified by + autoupdate have been removed; the replacements are all in 2.59 so + the pre-req hasn't been changed. --enable-werror checks for support + for -Werror (or the given argument) in the compiler. This mimics the + gcc configure option by allowing -Werror to be turned on safely; without + the option the tests written in configure itself fail compilation because + they cause compiler warnings. + Rewrote autogen.sh to run autoreconf instead of running tools one-by-one. + Conditionalize the install rules for MINGW and CYGWIN in CMakeLists.txt and + set CMAKE_LIBRARY_OUTPUT_DIRECTORY to "lib" on all platforms (C. Yapp). + Freeze libtool files in the 'scripts' directory. This version of autogen.sh + attempts to dissuade people from running it when it is not, or should not, + be necessary. In fact, autogen.sh does not work when run in a libpng + directory extracted from a tar distribution anymore. You must run it in + a GIT clone instead. + Added two images to contrib/pngsuite (1-bit and 2-bit transparent grayscale), + and renamed three whose names were inconsistent with those in + pngsuite/README.txt. + +Version 1.6.0beta08 [February 1, 2012] + Fixed Image::colormap misalignment in pngstest.c + Check libtool/libtoolize version number (2.4.2) in configure.ac + Divide test-pngstest.sh into separate pngstest runs for basic and + transparent images. + Moved automake options to AM_INIT_AUTOMAKE in configure.ac + Added color-tests, silent-rules (Not yet implemented in Makefile.am) and + version checking to configure.ac + Improved pngstest speed by not doing redundant tests and add const to + the background parameter of png_image_finish_read. The --background + option is now done automagically only when required, so that commandline + option no longer exists. + Cleaned up pngpriv.h to consistently declare all functions and data. + Also eliminated PNG_CONST_DATA, which is apparently not needed but we + can't be sure until it is gone. + Added symbol prefixing that allows all the libpng external symbols + to be prefixed (suggested by Reuben Hawkins). + Updated "ftbb*.png" list in the owatcom and vstudio projects. + Fixed 'prefix' builds on clean systems. The generation of pngprefix.h + should not require itself. + Updated INSTALL to explain that autogen.sh must be run in a GIT clone, + not in a libpng directory extracted from a tar distribution. + +Version 1.6.0beta09 [February 1, 2012] + Reverted the prebuilt configure files to libpng-1.6.0beta05 condition. + +Version 1.6.0beta10 [February 3, 2012] + Added Z_SOLO for zlib-1.2.6+ and correct pngstest tests + Updated list of test images in CMakeLists.txt + Updated the prebuilt configure files to current condition. + Revised INSTALL information about autogen.sh; it works in tar distributions. + +Version 1.6.0beta11 [February 16, 2012] + Fix character count in pngstest command in projects/owatcom/pngstest.tgt + Revised test-pngstest.sh to report PASS/FAIL for each image. + Updated documentation about the simplified API. + Corrected estimate of error in libpng png_set_rgb_to_gray API. The API is + extremely inaccurate for sRGB conversions because it uses an 8-bit + intermediate linear value and it does not use the sRGB transform, so it + suffers from the known instability in gamma transforms for values close + to 0 (see Poynton). The net result is that the calculation has a maximum + error of 14.99/255; 0.5/255^(1/2.2). pngstest now uses 15 for the + permitted 8-bit error. This may still not be enough because of arithmetic + error. + Removed some unused arrays (with #ifdef) from png_read_push_finish_row(). + Fixed a memory overwrite bug in simplified read of RGB PNG with + non-linear gamma Also bugs in the error checking in pngread.c and changed + quite a lot of the checks in pngstest.c to be correct; either correctly + written or not over-optimistic. The pngstest changes are insufficient to + allow all possible RGB transforms to be passed; pngstest cmppixel needs + to be rewritten to make it clearer which errors it allows and then changed + to permit known inaccuracies. + Removed tests for no-longer-used *_EMPTY_PLTE_SUPPORTED from pngstruct.h + Fixed fixed/float API export conditionals. 1) If FIXED_POINT or + FLOATING_POINT options were switched off, png.h ended up with lone ';' + characters. This is not valid ANSI-C outside a function. The ';' + characters have been moved inside the definition of PNG_FP_EXPORT and + PNG_FIXED_EXPORT. 2) If either option was switched off, the declaration + of the corresponding functions were completely omitted, even though some + of them are still used internally. The result is still valid, but + produces warnings from gcc with some warning options (including -Wall). The + fix is to cause png.h to declare the functions with PNG_INTERNAL_FUNCTION + when png.h is included from pngpriv.h. + Check for invalid palette index while reading paletted PNG. When one is + found, issue a warning and increase png_ptr->num_palette accordingly. + Apps are responsible for checking to see if that happened. + +Version 1.6.0beta12 [February 18, 2012] + Do not increase num_palette on invalid_index. + Relocated check for invalid palette index to pngrtran.c, after unpacking + the sub-8-bit pixels. + Fixed CVE-2011-3026 buffer overrun bug. This bug was introduced when + iCCP chunk support was added at libpng-1.0.6. Deal more correctly with the + test on iCCP chunk length. Also removed spurious casts that may hide + problems on 16-bit systems. + +Version 1.6.0beta13 [February 24, 2012] + Eliminated redundant png_push_read_tEXt|zTXt|iTXt|unknown code from + pngpread.c and use the sequential png_handle_tEXt, etc., in pngrutil.c; + now that png_ptr->buffer is inaccessible to applications, the special + handling is no longer useful. + Added PNG_SAFE_LIMITS feature to pnglibconf.dfa, pngpriv.h, and new + pngusr.dfa to reset the user limits to safe ones if PNG_SAFE_LIMITS is + defined. To enable, use "CPPFLAGS=-DPNG_SAFE_LIMITS_SUPPORTED=1" on the + configure command or put #define PNG_SAFE_LIMITS_SUPPORTED in + pnglibconf.h.prebuilt and pnglibconf.h. + +Version 1.6.0beta14 [February 27, 2012] + Added information about the new limits in the manual. + Updated Makefile.in + +Version 1.6.0beta15 [March 2, 2012] + Removed unused "current_text" members of png_struct and the png_free() + of png_ptr->current_text from pngread.c + Rewrote pngstest.c for substantial speed improvement. + Fixed transparent pixel and 16-bit rgb tests in pngstest and removed a + spurious check in pngwrite.c + Added PNG_IMAGE_FLAG_FAST for the benefit of applications that store + intermediate files, or intermediate in-memory data, while processing + image data with the simplified API. The option makes the files larger + but faster to write and read. pngstest now uses this by default; this + can be disabled with the --slow option. + Improved pngstest fine tuning of error numbers, new test file generator. + The generator generates images that test the full range of sample values, + allow the error numbers in pngstest to be tuned and checked. makepng + also allows generation of images with extra chunks, although this is + still work-in-progress. + Added check for invalid palette index while reading. + Fixed some bugs in ICC profile writing. The code should now accept + all potentially valid ICC profiles and reject obviously invalid ones. + It now uses png_error() to do so rather than casually writing a PNG + without the necessary color data. + Removed whitespace from the end of lines in all source files and scripts. + +Version 1.6.0beta16 [March 6, 2012] + Relocated palette-index checking function from pngrutil.c to pngtrans.c + Added palette-index checking while writing. + Changed png_inflate() and calling routines to avoid overflow problems. + This is an intermediate check-in that solves the immediate problems and + introduces one performance improvement (avoiding a copy via png_ptr->zbuf.) + Further changes will be made to make ICC profile handling more secure. + Fixed build warnings (MSVC, GCC, GCC v3). Cygwin GCC with default options + declares 'index' as a global, causing a warning if it is used as a local + variable. GCC 64-bit warns about assigning a (size_t) (unsigned 64-bit) + to an (int) (signed 32-bit). MSVC, however, warns about using the + unary '-' operator on an unsigned value (even though it is well defined + by ANSI-C to be ~x+1). The padding calculation was changed to use a + different method. Removed the tests on png_ptr->pass. + Added contrib/libtests/tarith.c to test internal arithmetic functions from + png.c. This is a libpng maintainer program used to validate changes to the + internal arithmetic functions. + Made read 'inflate' handling like write 'deflate' handling. The read + code now claims and releases png_ptr->zstream, like the write code. + The bug whereby the progressive reader failed to release the zstream + is now fixed, all initialization is delayed, and the code checks for + changed parameters on deflate rather than always calling + deflatedEnd/deflateInit. + Validate the zTXt strings in pngvalid. + Added code to validate the windowBits value passed to deflateInit2(). + If the call to deflateInit2() is wrong a png_warning will be issued + (in fact this is harmless, but the PNG data produced may be sub-optimal). + +Version 1.6.0beta17 [March 10, 2012] + Fixed PNG_LIBPNG_BUILD_BASE_TYPE definition. + Reject all iCCP chunks after the first, even if the first one is invalid. + Deflate/inflate was reworked to move common zlib calls into single + functions [rw]util.c. A new shared keyword check routine was also added + and the 'zbuf' is no longer allocated on progressive read. It is now + possible to call png_inflate() incrementally. A warning is no longer + issued if the language tag or translated keyword in the iTXt chunk + has zero length. + If benign errors are disabled use maximum window on ancilliary inflate. + This works round a bug introduced in 1.5.4 where compressed ancillary + chunks could end up with a too-small windowBits value in the deflate + header. + +Version 1.6.0beta18 [March 16, 2012] + Issue a png_benign_error() instead of png_warning() about bad palette index. + In pngtest, treat benign errors as errors if "-strict" is present. + Fixed an off-by-one error in the palette index checking function. + Fixed a compiler warning under Cygwin (Windows-7, 32-bit system) + Revised example.c to put text strings in a temporary character array + instead of directly assigning string constants to png_textp members. + This avoids compiler warnings when -Wwrite-strings is enabled. + Added output flushing to aid debugging under Visual Studio. Unfortunately + this is necessary because the VS2010 output window otherwise simply loses + the error messages on error (they weren't flushed to the window before + the process exited, apparently!) + Added configuration support for benign errors and changed the read + default. Also changed some warnings in the iCCP and sRGB handling + from to benign errors. Configuration now makes read benign + errors warnings and write benign errors to errors by default (thus + changing the behavior on read). The simplified API always forces + read benign errors to warnings (regardless of the system default, unless + this is disabled in which case the simplified API can't be built.) + +Version 1.6.0beta19 [March 18, 2012] + Work around for duplicate row start calls; added warning messages. + This turns on PNG_FLAG_DETECT_UNINITIALIZED to detect app code that + fails to call one of the 'start' routines (not enabled in libpng-1.5 + because it is technically an API change, since it did normally work + before.) It also makes duplicate calls to png_read_start_row (an + internal function called at the start of the image read) benign, as + they were before changes to use png_inflate_claim. Somehow webkit is + causing this to happen; this is probably a mis-feature in the zlib + changes so this commit is only a work-round. + Removed erroneous setting of DETECT_UNINITIALIZED and added more + checks. The code now does a png_error if an attempt is made to do the + row initialization twice; this is an application error and it has + serious consequences because the transform data in png_struct is + changed by each call. + Added application error reporting and added chunk names to read + benign errors; also added --strict to pngstest - not enabled + yet because a warning is produced. + Avoid the double gamma correction warning in the simplified API. + This allows the --strict option to pass in the pngstest checks + +Version 1.6.0beta20 [March 29, 2012] + Changed chunk handler warnings into benign errors, incrementally load iCCP + Added checksum-icc.c to contrib/tools + Prevent PNG_EXPAND+PNG_SHIFT doing the shift twice. + Recognize known sRGB ICC profiles while reading; prefer writing the + iCCP profile over writing the sRGB chunk, controlled by the + PNG_sRGB_PROFILE_CHECKS option. + Revised png_set_text_2() to avoid potential memory corruption (fixes + CVE-2011-3048, also known as CVE-2012-3425). + +Version 1.6.0beta21 [April 27, 2012] + Revised scripts/makefile.darwin: use system zlib; remove quotes around + architecture list; add missing ppc architecture; add architecture options + to shared library link; don't try to create a shared lib based on missing + RELEASE variable. + Enable png_set_check_for_invalid_index() for both read and write. + Removed #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED in pngpriv.h around + declaration of png_handle_unknown(). + Added -lssp_nonshared in a comment in scripts/makefile.freebsd + and changed deprecated NOOBJ and NOPROFILE to NO_OBJ and NO_PROFILE. + +Version 1.6.0beta22 [May 23, 2012] + Removed need for -Wno-cast-align with clang. clang correctly warns on + alignment increasing pointer casts when -Wcast-align is passed. This + fixes the cases that clang warns about either by eliminating the + casts from png_bytep to png_uint_16p (pngread.c), or, for pngrutil.c + where the cast is previously verified or pngstest.c where it is OK, by + introducing new png_aligncast macros to do the cast in a way that clang + accepts. + +Version 1.6.0beta23 [June 6, 2012] + Revised CMakeLists.txt to not attempt to make a symlink under mingw. + Made fixes for new optimization warnings from gcc 4.7.0. The compiler + performs an optimization which is safe; however it then warns about it. + Changing the type of 'palette_number' in pngvalid.c removes the warning. + Do not depend upon a GCC feature macro being available for use in generating + the linker mapfile symbol prefix. + Improved performance of new do_check_palette_indexes() function (only + update the value when it actually increases, move test for whether + the check is wanted out of the function. + +Version 1.6.0beta24 [June 7, 2012] + Don't check palette indexes if num_palette is 0 (as it can be in MNG files). + +Version 1.6.0beta25 [June 16, 2012] + Revised png_set_keep_unknown_chunks() so num_chunks < 0 means ignore all + unknown chunks and all known chunks except for IHDR, PLTE, tRNS, IDAT, + and IEND. Previously it only meant ignore all unknown chunks, the + same as num_chunks == 0. Revised png_image_skip_unused_chunks() to + provide a list of chunks to be processed instead of a list of chunks to + ignore. Revised contrib/gregbook/readpng2.c accordingly. + +Version 1.6.0beta26 [July 10, 2012] + Removed scripts/makefile.cegcc from the *.zip and *.7z distributions; it + depends on configure, which is not included in those archives. + Moved scripts/chkfmt to contrib/tools. + Changed "a+w" to "u+w" in Makefile.in to fix CVE-2012-3386. + +Version 1.6.0beta27 [August 11, 2012] + Do not compile PNG_DEPRECATED, PNG_ALLOC and PNG_PRIVATE when __GNUC__ < 3. + Do not use __restrict when GNUC is <= 3.1 + Removed references to png_zalloc() and png_zfree() from the manual. + Fixed configurations where floating point is completely disabled. Because + of the changes to support symbol prefixing PNG_INTERNAL_FUNCTION declares + floating point APIs during libpng builds even if they are completely + disabled. This requires the png floating point types (png_double*) to be + declared even though the functions are never actually defined. This + change provides a dummy definition so that the declarations work, yet any + implementation will fail to compile because of an incomplete type. + Re-eliminated the use of strcpy() in pngtest.c. An unncessary use of + strcpy() was accidentally re-introduced in libpng16; this change replaces + it with strncpy(). + Eliminated use of png_sizeof(); use sizeof() instead. + Use a consistent style for (sizeof type) and (sizeof (array)) + Cleanup of png_set_filler(). This function does very different things on + read and write. In libpng 1.6 the two cases can be distinguished and + considerable code cleanup, and extra error checking, is possible. This + makes calls on the write side that have no effect be ignored with a + png_app_error(), which can be disabled in the app using + png_set_benign_errors(), and removes the spurious use of usr_channels + on the read side. + Insist on autotools 1.12.1 for git builds because there are security issues + with 1.12 and insisting on anything less would allow 1.12 to be used. + Removed info_ptr->signature[8] from WRITE-only builds. + Add some conditions for compiling png_fixed(). This is a small function + but it requires "-lm" on some platforms. + Cause pngtest --strict to fail on any warning from libpng (not just errors) + and cause it not to fail at the comparison step if libpng lacks support + for writing chunks that it reads from the input (currently only implemented + for compressed text chunks). + Make all three "make check" test programs work without READ or WRITE support. + Now "make check" will succeed even if libpng is compiled with -DPNG_NO_READ + or -DPNG_NO_WRITE. The tests performed are reduced, but the basic reading + and writing of a PNG file is always tested by one or more of the tests. + Consistently use strlen(), memset(), memcpy(), and memcmp() instead of the + png_strlen(), png_memset(), png_memcpy(), and png_memcmp() macros. + Removed the png_sizeof(), png_strlen(), png_memset(), png_memcpy(), and + png_memcmp() macros. + Work around gcc 3.x and Microsoft Visual Studio 2010 complaints. Both object + to the split initialization of num_chunks. + +Version 1.6.0beta28 [August 29, 2012] + Unknown handling fixes and clean up. This adds more correct option + control of the unknown handling, corrects the pre-existing bug where + the per-chunk 'keep' setting is ignored and makes it possible to skip + IDAT chunks in the sequential reader (broken in earlier 1.6 versions). + There is a new test program, test-unknown.c, which is a work in progress + (not currently part of the test suite). Comments in the header files now + explain how the unknown handling works. + Allow fine grain control of unknown chunk APIs. This change allows + png_set_keep_unknown_chunks() to be turned off if not required and causes + both read and write to behave appropriately (on read this is only possible + if the user callback is used to handle unknown chunks). The change + also removes the support for storing unknown chunks in the info_struct + if the only unknown handling enabled is via the callback, allowing libpng + to be configured with callback reading and none of the unnecessary code. + Corrected fix for unknown handling in pngtest. This reinstates the + libpng handling of unknown chunks other than vpAg and sTER (including + unsafe-to-copy chunks which were dropped before) and eliminates the + repositioning of vpAg and sTER in pngtest.png by changing pngtest.png + (so the chunks are where libpng would put them). + Added "tunknown" test and corrected a logic error in png_handle_unknown() + when SAVE support is absent. Moved the shell test scripts for + contrib/libtests from the libpng top directory to contrib/libtests. + png_handle_unknown() must always read or skip the chunk, if + SAVE_UNKNOWN_CHUNKS is turned off *and* the application does not set + a user callback an unknown chunk will not be read, leading to a read + error, which was revealed by the "tunknown" test. + Cleaned up and corrected ICC profile handling. + contrib/libtests/makepng: corrected 'rgb' and 'gray' cases. profile_error + messages could be truncated; made a correct buffer size calculation and + adjusted pngerror.c appropriately. png_icc_check_* checking improved; + changed the functions to receive the correct color type of the PNG on read + or write and check that it matches the color space of the profile (despite + what the comments said before, there is danger in assuming the app will + cope correctly with an RGB profile on a grayscale image and, since it + violates the PNG spec, allowing it is certain to produce inconsistent + app behavior and might even cause app crashes.) Check that profiles + contain the tags needed to process the PNG (tags all required by the ICC + spec). Removed unused PNG_STATIC from pngpriv.h. + +Version 1.6.0beta29 [September 4, 2012] + Fixed the simplified API example programs to add the *colormap parameter + to several of he API and improved the error message if the version field + is not set. + Added contrib/examples/* to the *.zip and *.7z distributions. + Updated simplified API synopses and description of the png_image structure + in the manual. + Made makepng and pngtest produce identical PNGs, add "--relaxed" option + to pngtest. The "--relaxed" option turns off the benign errors that are + enabled by default in pre-RC builds. makepng can now write ICC profiles + where the length has not been extended to a multiple of 4, and pngtest + now intercepts all libpng errors, allowing the previously-introduced + "--strict test" on no warnings to actually work. + Improved ICC profile handling including cHRM chunk generation and fixed + Cygwin+MSVC build errors. The ICC profile handling now includes more + checking. Several errors that caused rejection of the profile are now + handled with a warning in such a way that the invalid profiles will be + read by default in release (but not pre-RC) builds but will not be + written by default. The easy part of handling the cHRM chunk is written, + where the ICC profile contains the required data. The more difficult + part plus guessing a gAMA value requires code to pass selected RGB values + through the profile. + +Version 1.6.0beta30 [October 24, 2012] + Changed ICC profile matrix/vector types to not depend on array type rules. + By the ANSI-C standard the new types should be identical to the previous + versions, and all known versions of gcc tested with the previous versions + except for GCC-4.2.1 work with this version. The change makes the ANSI-C + rule that const applied to an array of elements applies instead to the + elements in the array moot by explicitly applying const to the base + elements of the png_icc_matrix and png_icc_vector types. The accidental + (harmless) 'const' previously applied to the parameters of two of the + functions have also been removed. + Added a work around for GCC 4.2 optimization bug. + Marked the broken (bad white point) original HP sRGB profiles correctly and + correct comments. + Added -DZ_SOLO to contrib/pngminim/*/makefile to work with zlib-1.2.7 + Use /MDd for vstudio debug builds. Also added pngunkown to the vstudio + builds, fixed build errors and corrected a minor exit code error in + pngvalid if the 'touch' file name is invalid. + Add updated WARNING file to projects/vstudio from libpng 1.5/vstudio + Fixed build when using #define PNG_NO_READ_GAMMA in png_do_compose() in + pngrtran.c (Domani Hannes). + +Version 1.6.0beta31 [November 1, 2012] + Undid the erroneous change to vstudio/pngvalid build in libpng-1.6.0beta30. + Made pngvalid so that it will build outside the libpng source tree. + Made builds -DPNG_NO_READ_GAMMA compile (the unit tests still fail). + Made PNG_NO_READ_GAMMA switch off interfaces that depend on READ_GAMMA. + Prior to 1.6.0 switching off READ_GAMMA did unpredictable things to the + interfaces that use it (specifically, png_do_background in 1.4 would + simply display composite for grayscale images but do composition + with the incorrect arithmetic for color ones). In 1.6 the semantic + of -DPNG_NO_READ_GAMMA is changed to simply disable any interface that + depends on it; this obliges people who set it to consider whether they + really want it off if they happen to use any of the interfaces in + question (typically most users who disable it won't). + Fixed GUIDs in projects/vstudio. Some were duplicated or missing, + resulting in VS2010 having to update the files. + Removed non-working ICC profile support code that was mostly added to + libpng-1.6.0beta29 and beta30. There was too much code for too little + gain; implementing full ICC color correction may be desireable but is left + up to applications. + +Version 1.6.0beta32 [November 25, 2012] + Fixed an intermittent SEGV in pngstest due to an uninitialized array element. + Added the ability for contrib/libtests/makepng.c to make a PNG with just one + color. This is useful for debugging pngstest color inaccuracy reports. + Fixed error checking in the simplified write API (Olaf van der Spek) + Made png_user_version_check() ok to use with libpng version 1.10.x and later. + +Version 1.6.0beta33 [December 15, 2012] + Fixed typo in png.c (PNG_SET_CHUNK_MALLOC_MAX should be PNG_CHUNK_MALLOC_MAX) + that causes the MALLOC_MAX limit not to work (John Bowler) + Change png_warning() to png_app_error() in pngwrite.c and comment the + fall-through condition. + Change png_warning() to png_app_warning() in png_write_tRNS(). + Rearranged the ARM-NEON optimizations: Isolated the machine specific code + to the hardware subdirectory and added comments to pngrutil.c so that + implementors of other optimizations know what to do. + Fixed cases of unquoted DESTDIR in Makefile.am + Rebuilt Makefile.in, etc., with autoconf-2.69 and automake-1.12.5. + +Version 1.6.0beta34 [December 19, 2012] + Cleaned up whitespace in the synopsis portion of the manpage "libpng.3" + Disassembled the version number in scripts/options.awk (necessary for + building on SunOs). + +Version 1.6.0beta35 [December 23, 2012] + Made default Zlib compression settings be configurable. This adds #defines to + pnglibconf.h to control the defaults. + Fixed Windows build issues, enabled ARM compilation. Various warnings issued + by earlier versions of GCC fixed for Cygwin and Min/GW (which both use old + GCCs.) ARM support is enabled by default in zlib.props (unsupported by + Microsoft) and ARM compilation is made possible by deleting the check for + x86. The test programs cannot be run because they are not signed. + +Version 1.6.0beta36 [January 2, 2013] + Discontinued distributing libpng-1.x.x.tar.bz2. + Discontinued distributing libpng-1.7.0-1.6.0-diff.txt and similar. + Rebuilt configure with autoconf-2.69 (inadvertently not done in beta33) + Fixed 'make distcheck' on SUN OS - libpng.so was not being removed + +Version 1.6.0beta37 [January 10, 2013] + Fixed conceivable but difficult to repro overflow. Also added two test + programs to generate and test a PNG which should have the problem. + +Version 1.6.0beta39 [January 19, 2013] + Again corrected attempt at overflow detection in png_set_unknown_chunks(). + Added overflow detection in png_set_sPLT() and png_set_text_2(). + +Version 1.6.0beta40 [January 20, 2013] + Use consistent handling of overflows in text, sPLT and unknown png_set_* APIs + +Version 1.6.0rc01 [January 26, 2013] + No changes. + +Version 1.6.0rc02 [February 4, 2013] + Added png_get_palette_max() function. + +Version 1.6.0rc03 [February 5, 2013] + Fixed the png_get_palette_max API. + +Version 1.6.0rc04 [February 7, 2013] + Turn serial tests back on (recently turned off by autotools upgrade). + +Version 1.6.0rc05 [February 8, 2013] + Update manual about png_get_palette_max(). + +Version 1.6.0rc06 [February 9, 2013] + Fixed missing dependency in --prefix builds The intermediate + internal 'prefix.h' file can only be generated correctly after + pnglibconf.h, however the dependency was not in Makefile.am. The + symptoms are unpredictable depending on the order make chooses to + build pngprefix.h and pnglibconf.h, often the error goes unnoticed + because there is a system pnglibconf.h to use instead. + +Version 1.6.0rc07 [February 10, 2013] + Enclosed the new png_get_palette_max in #ifdef PNG_GET_PALETTE_MAX_SUPPORTED + block, and revised pnglibconf.h and pnglibconf.h.prebuilt accordingly. + +Version 1.6.0rc08 [February 10, 2013] + Fix typo in png.h #ifdef + +Version 1.6.0 [February 14, 2013] + No changes. + +Version 1.6.1beta01 [February 16, 2013] + Made symbol prefixing work with the ARM neon optimizations. Also allow + pngpriv.h to be included for preprocessor definitions only, so it can + be used in non-C/C++ files. Back ported from libpng 1.7. + Made sRGB check numbers consistent. + Ported libpng 1.5 options.awk/dfn file handling to 1.6, fixed one bug. + Removed cc -E workround, corrected png_get_palette_max API Tested on + SUN OS cc 5.9, which demonstrates the tokenization problem previously + avoided by using /lib/cpp. Since all .dfn output is now protected in + double quotes unless it is to be macro substituted the fix should + work everywhere. + Enabled parallel tests - back ported from libpng-1.7. + scripts/pnglibconf.dfa formatting improvements back ported from libpng17. + Fixed a race condition in the creation of the build 'scripts' directory + while building with a parallel make. + Use approved/supported Android method to check for NEON, use Linux/POSIX + 1003.1 API to check /proc/self/auxv avoiding buffer allocation and other + library calls (ported from libpng15). + +Version 1.6.1beta02 [February 19, 2013] + Use parentheses more consistently in "#if defined(MACRO)" tests. + Folded long lines. + Reenabled code to allow zero length PLTE chunks for MNG. + +Version 1.6.1beta03 [February 22, 2013] + Fixed ALIGNED_MEMORY support. + Allow run-time ARM NEON checking to be disabled. A new configure option: + --enable-arm-neon=always will stop the run-time checks. New checks + within arm/arm_init.c will cause the code not to be compiled unless + __ARM_NEON__ is set. This should make it fail safe (if someone asks + for it on then the build will fail if it can't be done.) + Updated the INSTALL document. + +Version 1.6.1beta04 [February 27, 2013] + Revised INSTALL to recommend using CPPFLAGS instead of INCLUDES. + Revised scripts/makefile.freebsd to respect ZLIBLIB and ZLIBINC. + Revised scripts/dfn.awk to work with the buggy MSYS awk that has trouble + with CRLF line endings. + +Version 1.6.1beta05 [March 1, 2013] + Avoid a possible memory leak in contrib/gregbook/readpng.c + +Version 1.6.1beta06 [March 4, 2013] + Better documentation of unknown handling API interactions. + Corrected Android builds and corrected libpng.vers with symbol + prefixing This adds an API to set optimization options externally, + providing an alternative and general solution for the non-portable + run-time tests used by the ARM Neon code. It also makes those tests + compile and link on Android. + The order of settings vs options in pnglibconf.h is reversed to allow + settings to depend on options and options can now set (or override) the + defaults for settings. + +Version 1.6.1beta07 [March 7, 2013] + Corrected simplified API default gamma for color-mapped output, added + a flag to change default. In 1.6.0 when the simplified API was used + to produce color-mapped output from an input image with no gamma + information the gamma assumed for the input could be different from + that assumed for non-color-mapped output. In particular 16-bit depth + input files were assumed to be sRGB encoded, whereas in the 'direct' + case they were assumed to have linear data. This was an error. The + fix makes the simplified API treat all input files the same way and + adds a new flag to the png_image::flags member to allow the + application/user to specify that 16-bit files contain sRGB data + rather than the default linear. + Fixed bugs in the pngpixel and makepng test programs. + +Version 1.6.1beta08 [March 7, 2013] + Fixed CMakelists.txt to allow building a single variant of the library + (Claudio Bley): + Introduced a PNG_LIB_TARGETS variable that lists all activated library + targets. It is an error if this variable ends up empty, ie. you have + to build at least one library variant. + Made the *_COPY targets only depend on library targets actually being build. + Use PNG_LIB_TARGETS to unify a code path. + Changed the CREATE_SYMLINK macro to expect the full path to a file as the + first argument. When symlinking the filename component of that path is + determined and used as the link target. + Use copy_if_different in the CREATE_SYMLINK macro. + +Version 1.6.1beta09 [March 13, 2013] + Eliminated two warnings from the Intel C compiler. The warnings are + technically valid, although a reasonable treatment of division would + show it to be incorrect. + +Version 1.6.1rc01 [March 21, 2013] + No changes. + +Version 1.6.1 [March 28, 2013] + No changes. + +Version 1.6.2beta01 [April 14, 2013] + Updated documentation of 1.5.x to 1.6.x changes in iCCP chunk handling. + Fixed incorrect warning of excess deflate data. End condition - the + warning would be produced if the end of the deflate stream wasn't read + in the last row. The warning is harmless. + Corrected the test on user transform changes on read. It was in the + png_set of the transform function, but that doesn't matter unless the + transform function changes the rowbuf size, and that is only valid if + transform_info is called. + Corrected a misplaced closing bracket in contrib/libtests/pngvalid.c + (Flavio Medeiros). + Corrected length written to uncompressed iTXt chunks (Samuli Suominen). + Bug was introduced in libpng-1.6.0. + +Version 1.6.2rc01 [April 18, 2013] + Added contrib/tools/fixitxt.c, to repair the erroneous iTXt chunk length + written by libpng-1.6.0 and 1.6.1. + Disallow storing sRGB information when the sRGB is not supported. + +Version 1.6.2rc02 [April 18, 2013] + Merge pngtest.c with libpng-1.7.0 + +Version 1.6.2rc03 [April 22, 2013] + Trivial spelling cleanup. + +Version 1.6.2rc04 and 1.6.2rc05 [omitted] + +Version 1.6.2rc06 [April 24, 2013] + Reverted to version 1.6.2rc03. Recent changes to arm/neon support + have been ported to libpng-1.7.0beta09 and will reappear in version + 1.6.3beta01. + +Version 1.6.2 [April 25, 2013] + No changes. + +Version 1.6.3beta01 [April 25, 2013] + Revised stack marking in arm/filter_neon.S and configure.ac. + Ensure that NEON filter stuff is completely disabled when switched 'off'. + Previously the ARM NEON specific files were still built if the option + was switched 'off' as opposed to being explicitly disabled. + +Version 1.6.3beta02 [April 26, 2013] + Test for 'arm*' not just 'arm' in the host_cpu configure variable. + Rebuilt the configure scripts. + +Version 1.6.3beta03 [April 30, 2013] + Expanded manual paragraph about writing private chunks, particularly + the need to call png_set_keep_unknown_chunks() when writing them. + Avoid dereferencing NULL pointer possibly returned from + png_create_write_struct() (Andrew Church). + +Version 1.6.3beta05 [May 9, 2013] + Calculate our own zlib windowBits when decoding rather than trusting the + CMF bytes in the PNG datastream. + Added an option to force maximum window size for inflating, which was + the behavior of libpng15 and earlier. + Added png-fix-itxt and png-fix-too-far-back to the built programs and + removed warnings from the source code and timepng that are revealed as + a result. + Detect wrong libpng versions linked to png-fix-too-far-back, which currently + only works with libpng versions that can be made to reliably fail when + the deflate data contains an out-of-window reference. This means only + 1.6 and later. + Fixed gnu issues: g++ needs a static_cast, gcc 4.4.7 has a broken warning + message which it is easier to work round than ignore. + Updated contrib/pngminus/pnm2png.c (Paul Stewart): + Check for EOF + Ignore "#" delimited comments in input file to pnm2png.c. + Fixed whitespace handling + Added a call to png_set_packing() + Initialize dimension values so if sscanf fails at least we have known + invalid values. + Attempt to detect configuration issues with png-fix-too-far-back, which + requires both the correct libpng and the correct zlib to function + correctly. + Check ZLIB_VERNUM for mismatches, enclose #error in quotes + Added information in the documentation about problems with and fixes for + the bad CRC and bad iTXt chunk situations. + +Version 1.6.3beta06 [May 12, 2013] + Allow contrib/pngminus/pnm2png.c to compile without WRITE_INVERT and + WRITE_PACK supported (writes error message that it can't read P1 or + P4 PBM files). + Improved png-fix-too-far-back usage message, added --suffix option. + Revised contrib/pngminim/*/makefile to generate pnglibconf.h with the + right zlib header files. + Separated CPPFLAGS and CFLAGS in contrib/pngminim/*/makefile + +Version 1.6.3beta07 [June 8, 2013] + Removed a redundant test in png_set_IHDR(). + Added set(CMAKE_CONFIGURATION_TYPES ...) to CMakeLists.txt (Andrew Hundt) + Deleted set(CMAKE_BUILD_TYPE) block from CMakeLists.txt + Enclose the prototypes for the simplified write API in + #ifdef PNG_STDIO_SUPPORTED/#endif + Make ARM NEON support work at compile time (not just configure time). + This moves the test on __ARM_NEON__ into pngconf.h to avoid issues when + using a compiler that compiles for multiple architectures at one time. + Removed PNG_FILTER_OPTIMIZATIONS and PNG_ARM_NEON_SUPPORTED from + pnglibconf.h, allowing more of the decisions to be made internally + (pngpriv.h) during the compile. Without this, symbol prefixing is broken + under certain circumstances on ARM platforms. Now only the API parts of + the optimizations ('check' vs 'api') are exposed in the public header files + except that the new setting PNG_ARM_NEON_OPT documents how libpng makes the + decision about whether or not to use the optimizations. + Protect symbol prefixing against CC/CPPFLAGS/CFLAGS useage. + Previous iOS/Xcode fixes for the ARM NEON optimizations moved the test + on __ARM_NEON__ from configure time to compile time. This breaks symbol + prefixing because the definition of the special png_init_filter_functions + call was hidden at configure time if the relevant compiler arguments are + passed in CFLAGS as opposed to CC. This change attempts to avoid all + the confusion that would result by declaring the init function even when + it is not used, so that it will always get prefixed. + +Version 1.6.3beta08 [June 18, 2013] + Revised libpng.3 so that "doclifter" can process it. + +Version 1.6.3beta09 [June 27, 2013] + Revised example.c to illustrate use of PNG_DEFAULT_sRGB and PNG_GAMMA_MAC_18 + as parameters for png_set_gamma(). These have been available since + libpng-1.5.4. + Renamed contrib/tools/png-fix-too-far-back.c to pngfix.c and revised it + to check all compressed chunks known to libpng. + +Version 1.6.3beta10 [July 5, 2013] + Updated documentation to show default behavior of benign errors correctly. + Only compile ARM code when PNG_READ_SUPPORTED is defined. + Fixed undefined behavior in contrib/tools/pngfix.c and added new strip + option. pngfix relied on undefined behavior and even a simple change from + gcc to g++ caused it to fail. The new strip option 'unsafe' has been + implemented and is the default if --max is given. Option names have + been clarified, with --strip=transform now stripping the bKGD chunk, + which was stripped previously with --strip=unused. + Added all documented chunk types to pngpriv.h + Unified pngfix.c source with libpng17. + +Version 1.6.3rc01 [July 11, 2013] + No changes. + +Version 1.6.3 [July 18, 2013] + Revised manual about changes in iTXt chunk handling made in libpng-1.6.0. + Added "/* SAFE */" comments in pngrutil.c and pngrtran.c where warnings + may be erroneously issued by code-checking applications. + +Version 1.6.4beta01 [August 21, 2013] + Added information about png_set_options() to the manual. + Delay calling png_init_filter_functions() until a row with nonzero filter + is found. + +Version 1.6.4beta02 [August 30, 2013] + Fixed inconsistent conditional compilation of png_chunk_unknown_handling() + prototype, definition, and usage. Made it depend on + PNG_HANDLE_AS_UNKNOWN_SUPPORTED everywhere. + +Version 1.6.4rc01 [September 5, 2013] + No changes. + +Version 1.6.4 [September 12, 2013] + No changes. + +Version 1.6.5 [September 14, 2013] + Removed two stray lines of code from arm/arm_init.c. + +Version 1.6.6beta01 [September 16, 2013] + Removed two stray lines of code from arm/arm_init.c, again. + +Send comments/corrections/commendations to png-mng-implement at lists.sf.net +(subscription required; visit +https://lists.sourceforge.net/lists/listinfo/png-mng-implement +to subscribe) +or to glennrp at users.sourceforge.net Glenn R-P -*/ } #endif diff --git a/project/jni/png/INSTALL b/project/jni/png/INSTALL index 224850e68..f98737800 100644 --- a/project/jni/png/INSTALL +++ b/project/jni/png/INSTALL @@ -1,5 +1,5 @@ -Installing libpng version 1.4.6beta06 - January 23, 2011 +Installing libpng On Unix/Linux and similar systems, you can simply type @@ -9,14 +9,20 @@ On Unix/Linux and similar systems, you can simply type and ignore the rest of this document. -If configure does not work on your system and you have a reasonably -up-to-date set of tools, running ./autogen.sh before running ./configure -may fix the problem. You can also run the individual commands in -autogen.sh with the --force option, if supported by your version of -the tools. If you run 'libtoolize --force', though, this will replace -the distributed, patched, version of ltmain.sh with an unpatched version -and your shared library builds may fail to produce libraries with the -correct version numbers. +If configure does not work on your system, or if you have a need to +change configure.ac or Makefile.am, and you have a reasonably +up-to-date set of tools, running ./autogen.sh in a git clone before +running ./configure may fix the problem. To be really sure that you +aren't using any of the included pre-built scripts, you can do this: + + ./configure --enable-maintainer-mode + make maintainer-clean + ./autogen.sh --maintainer --clean + ./autogen.sh --maintainer + ./configure [--prefix=/path] [other options] + make + make install + make check Instead, you can use one of the custom-built makefiles in the "scripts" directory @@ -35,19 +41,33 @@ is not already on your system. zlib can usually be found wherever you got libpng. zlib can be placed in another directory, at the same level as libpng. +If your system already has a preinstalled zlib you will still need +to have access to the zlib.h and zconf.h include files that +correspond to the version of zlib that's installed. + +If you wish to test with a particular zlib that is not first in the +standard library search path, put ZLIBLIB, ZLIBINC, CPPFLAGS, LDFLAGS, +and LD_LIBRARY_PATH in your environment before running "make test" +or "make distcheck": + +ZLIBLIB=/path/to/lib export ZLIBLIB +ZLIBINC=/path/to/include export ZLIBINC +CPPFLAGS="-I$ZLIBINC" export CPPFLAGS +LDFLAGS="-L$ZLIBLIB" export LDFLAGS +LD_LIBRARY_PATH="$ZLIBLIB:$LD_LIBRARY_PATH" export LD_LIBRARY_PATH + +If you are using one of the makefile scripts, put ZLIBLIB and ZLIBINC +in your environment and type "make ZLIBLIB=$ZLIBLIB ZLIBINC=$ZLIBINC test". + If you want to use "cmake" (see www.cmake.org), type cmake . -DCMAKE_INSTALL_PREFIX=/path make make install -If your system already has a preinstalled zlib you will still need -to have access to the zlib.h and zconf.h include files that -correspond to the version of zlib that's installed. - You can rename the directories that you downloaded (they -might be called "libpng-1.4.6beta06" or "libpng14" and "zlib-1.2.3" -or "zlib123") so that you have directories called "zlib" and "libpng". +might be called "libpng-x.y.z" or "libpngNN" and "zlib-1.2.7" +or "zlib127") so that you have directories called "zlib" and "libpng". Your directory structure should look like this: @@ -60,24 +80,23 @@ Your directory structure should look like this: CMakeLists.txt => "cmake" script configuration files: configure.ac, configure, Makefile.am, Makefile.in, - autogen.sh, config.guess, ltmain.sh, missing, - aclocal.m4, config.h.in, config.sub, - depcomp, install-sh, test-pngtest.sh + autogen.sh, config.guess, ltmain.sh, missing, libpng.pc.in, + libpng-config.in, aclocal.m4, config.h.in, config.sub, + depcomp, install-sh, mkinstalldirs, test-pngtest.sh contrib gregbook + libtests pngminim pngminus pngsuite visupng projects - cbuilder5 (Borland) - visualc6 (msvc) visualc71 vstudio - xcode scripts makefile.* *.def (module definition files) + etc. pngtest.png etc. zlib @@ -108,7 +127,7 @@ scripts directory into this directory, for example Read the makefile to see if you need to change any source or target directories to match your preferences. -Then read pngconf.h to see if you want to make any configuration +Then read pnglibconf.dfa to see if you want to make any configuration changes. Then just run "make" which will create the libpng library in @@ -126,19 +145,26 @@ do that, run "make install" in the zlib directory first if necessary). Some also allow you to run "make test-installed" after you have run "make install". -If you encounter a compiler error message complaining about the -lines - - __png.h__ already includes setjmp.h; - __dont__ include it again.; - -this means you have compiled another module that includes setjmp.h, -which is hazardous because the two modules might not include exactly -the same setjmp.h. If you are sure that you know what you are doing -and that they are exactly the same, then you can comment out or -delete the two lines. Better yet, use the cexcept interface -instead, as demonstrated in contrib/visupng of the libpng distribution. - -Further information can be found in the README and libpng.txt +Further information can be found in the README and libpng-manual.txt files, in the individual makefiles, in png.h, and the manual pages libpng.3 and png.5. + +Using the ./configure script -- 16 December 2002. +================================================= + +The ./configure script should work compatibly with what scripts/makefile.* +did, however there are some options you might need to add to configure +explicitly, which previously was done semi-automatically (if you didn't edit +scripts/makefile.* yourself, that is) + +CFLAGS="-Wall -O -funroll-loops \ +-malign-loops=2 -malign-functions=2" ./configure --prefix=/usr/include \ +--with-pkgconfigdir=/usr/lib/pkgconfig --includedir=/usr/include + +You can alternatively specify --includedir=/usr/include, /usr/local/include, +/usr/include/libpng%NN%, or whatever. + +If you find that the configure script is out-of-date or is not supporting +your platform properly, try running autogen.sh to regenerate "configure", +"Makefile.in", and the other configuration files. Then try configure again. + diff --git a/project/jni/png/LICENSE b/project/jni/png/LICENSE index a9c270b76..75308d7eb 100644 --- a/project/jni/png/LICENSE +++ b/project/jni/png/LICENSE @@ -10,8 +10,8 @@ this sentence. This code is released under the libpng license. -libpng versions 1.2.6, August 15, 2004, through 1.4.6beta06, January 23, 2011, are -Copyright (c) 2004, 2006-2010 Glenn Randers-Pehrson, and are +libpng versions 1.2.6, August 15, 2004, through 1.6.6, September 16, 2013, are +Copyright (c) 2004, 2006-2013 Glenn Randers-Pehrson, and are distributed according to the same disclaimer and license as libpng-1.2.5 with the following individual added to the list of Contributing Authors @@ -108,4 +108,4 @@ certification mark of the Open Source Initiative. Glenn Randers-Pehrson glennrp at users.sourceforge.net -January 23, 2011 +September 16, 2013 diff --git a/project/jni/png/README b/project/jni/png/README index cee803a37..f71a50d1f 100644 --- a/project/jni/png/README +++ b/project/jni/png/README @@ -1,11 +1,11 @@ -README for libpng version 1.4.6beta06 - January 23, 2011 (shared library 14.0) +README for libpng version 1.6.6 - September 16, 2013 (shared library 16.0) See the note about version numbers near the top of png.h See INSTALL for instructions on how to install libpng. -Libpng comes in several distribution formats. Get libpng-*.tar.gz, -libpng-*.tar.xz or libpng-*.tar.bz2 if you want UNIX-style line endings -in the text files, or lpng*.zip if you want DOS-style line endings. +Libpng comes in several distribution formats. Get libpng-*.tar.gz or +libpng-*.tar.xz or if you want UNIX-style line endings in the text files, +or lpng*.7z or lpng*.zip if you want DOS-style line endings. Version 0.89 was the first official release of libpng. Don't let the fact that it's the first release fool you. The libpng library has been in @@ -58,7 +58,7 @@ on the PNG-implement mailing list and not on material submitted privately to Guy, Andreas, or Glenn. They will forward any good suggestions to the list. -For a detailed description on using libpng, read libpng.txt. For +For a detailed description on using libpng, read libpng-manual.txt. For examples of libpng in a program, see example.c and pngtest.c. For usage information and restrictions (what little they are) on libpng, see png.h. For a description on using zlib (the compression library used by @@ -77,17 +77,15 @@ compression library that is useful for more things than just PNG files. You can use zlib as a drop-in replacement for fread() and fwrite() if you are so inclined. -zlib should be available at the same place that libpng is, or at. -ftp://ftp.info-zip.org/pub/infozip/zlib +zlib should be available at the same place that libpng is, or at zlib.net. You may also want a copy of the PNG specification. It is available as an RFC, a W3C Recommendation, and an ISO/IEC Standard. You can find these at http://www.libpng.org/pub/png/documents/ This code is currently being archived at libpng.sf.net in the -[DOWNLOAD] area, and on CompuServe, Lib 20 (PNG SUPPORT) -at GO GRAPHSUP. If you can't find it in any of those places, -e-mail me, and I'll help you find it. +[DOWNLOAD] area, and at ftp://ftp.simplesystems.org. If you can't find it +in any of those places, e-mail me, and I'll help you find it. If you have any code changes, requests, problems, etc., please e-mail them to me. Also, I'd appreciate any make files or project files, @@ -105,7 +103,7 @@ based in a large way on Guy's and Andreas' earlier work), and the PNG development group. Send comments/corrections/commendations to png-mng-implement at -lists.sourceforge.net (subscription required; visit +lists.sourceforge.net (subscription required; visit https://lists.sourceforge.net/lists/listinfo/png-mng-implement to subscribe) or to glennrp at users.sourceforge.net @@ -114,19 +112,16 @@ given in previous versions of this document. He and Andreas will read mail addressed to the png-implement list, however. Please do not send general questions about PNG. Send them to -the (png-list at ccrc.wustl.edu, subscription required, write to -majordomo at ccrc.wustl.edu with "subscribe png-list" in your message). -On the other hand, -please do not send libpng questions to that address, send them to me -or to the png-implement list. I'll -get them in the end anyway. If you have a question about something +png-mng-misc at lists.sf.net (subscription required; visit +https://lists.sourceforge.net/lists/listinfo/png-mng-misc to +subscribe). If you have a question about something in the PNG specification that is related to using libpng, send it to me. Send me any questions that start with "I was using libpng, and ...". If in doubt, send questions to me. I'll bounce them to others, if necessary. Please do not send suggestions on how to change PNG. We have -been discussing PNG for nine years now, and it is official and +been discussing PNG for eighteen years now, and it is official and finished. If you have suggestions for libpng, however, I'll gladly listen. Even if your suggestion is not used immediately, it may be used later. @@ -141,13 +136,17 @@ Files in this distribution: TODO => Things not implemented in the current library Y2KINFO => Statement of Y2K compliance example.c => Example code for using libpng functions - libpng.3 => manual page for libpng (includes libpng.txt) - libpng.txt => Description of libpng and its functions + libpng.3 => manual page for libpng (includes libpng-manual.txt) + libpng-manual.txt => Description of libpng and its functions libpngpf.3 => manual page for libpng's private functions png.5 => manual page for the PNG format png.c => Basic interface functions common to library - png.h => Library function and interface declarations - pngconf.h => System specific library configuration + png.h => Library function and interface declarations (public) + pngpriv.h => Library function and interface declarations (private) + pngconf.h => System specific library configuration (public) + pngstruct.h => png_struct declaration (private) + pnginfo.h => png_info struct declaration (private) + pngdebug.h => debugging macros (private) pngerror.c => Error/warning message I/O functions pngget.c => Functions for retrieving info from struct pngmem.c => Memory handling functions @@ -166,82 +165,28 @@ Files in this distribution: pngwrite.c => High-level write functions pngwtran.c => Write data transformations pngwutil.c => Write utility functions + arm => Contains optimized code for the ARM platform contrib => Contributions + examples => Example programs gregbook => source code for PNG reading and writing, from Greg Roelofs' "PNG: The Definitive Guide", O'Reilly, 1999 - msvctest => Builds and runs pngtest using a MSVC workspace - pngminus => Simple pnm2png and png2pnm programs - pngsuite => Test images + libtests => Test programs + pngminim => Minimal decoder, encoder, and progressive decoder + programs demonstrating use of pngusr.dfa + pngminus => Simple pnm2png and png2pnm programs + pngsuite => Test images + tools => Various tools visupng => Contains a MSVC workspace for VisualPng projects => Contains project files and workspaces for building a DLL - c5builder => Contains a Borland workspace for building - libpng and zlib - visualc6 => Contains a Microsoft Visual C++ (MSVC) + owatcom => Contains a WATCOM project for building libpng + visualc71 => Contains a Microsoft Visual C++ (MSVC) + workspace for building libpng and zlib + vstudio => Contains a Microsoft Visual C++ (MSVC) workspace for building libpng and zlib scripts => Directory containing scripts for building libpng: - descrip.mms => VMS makefile for MMS or MMK - makefile.std => Generic UNIX makefile (cc, creates static - libpng.a) - makefile.elf => Linux/ELF makefile symbol versioning, - (gcc, creates libpng14.so.14.1.4.6beta06) - makefile.linux => Linux/ELF makefile - (gcc, creates libpng14.so.14.1.4.6beta06) - makefile.gcc => Generic makefile (gcc, creates static libpng.a) - makefile.knr => Archaic UNIX Makefile that converts files with - ansi2knr (Requires ansi2knr.c from - ftp://ftp.cs.wisc.edu/ghost) - makefile.aix => AIX makefile - makefile.cygwin => Cygwin/gcc makefile - makefile.darwin => Darwin makefile - makefile.dec => DEC Alpha UNIX makefile - makefile.freebsd => FreeBSD makefile - makefile.hpgcc => HPUX makefile using gcc - makefile.hpux => HPUX (10.20 and 11.00) makefile - makefile.hp64 => HPUX (10.20 and 11.00) makefile, 64 bit - makefile.ibmc => IBM C/C++ version 3.x for Win32 and OS/2 (static) - makefile.intel => Intel C/C++ version 4.0 and later - makefile.mingw => Mingw/gcc makefile - makefile.netbsd => NetBSD/cc makefile, makes libpng.so. - makefile.ne14bsd => NetBSD/cc makefile, makes - libpng14.so - makefile.openbsd => OpenBSD makefile - makefile.sgi => Silicon Graphics IRIX (cc, creates static lib) - makefile.sggcc => Silicon Graphics - (gcc, creates libpng14.so.14.1.4.6beta06) - makefile.sunos => Sun makefile - makefile.solaris => Solaris 2.X makefile - (gcc, creates libpng14.so.14.1.4.6beta06) - makefile.so9 => Solaris 9 makefile - (gcc, creates libpng14.so.14.1.4.6beta06) - makefile.32sunu => Sun Ultra 32-bit makefile - makefile.64sunu => Sun Ultra 64-bit makefile - makefile.sco => For SCO OSr5 ELF and Unixware 7 with Native cc - makefile.mips => MIPS makefile - makefile.acorn => Acorn makefile - makefile.amiga => Amiga makefile - smakefile.ppc => AMIGA smakefile for SAS C V6.58/7.00 PPC - compiler (Requires SCOPTIONS, copied from - scripts/SCOPTIONS.ppc) - makefile.atari => Atari makefile - makefile.beos => BEOS makefile for X86 - makefile.bor => Borland makefile (uses bcc) - makefile.bc32 => 32-bit Borland C++ (all modules compiled in C mode) - makefile.tc3 => Turbo C 3.0 makefile - makefile.dj2 => DJGPP 2 makefile - makefile.msc => Microsoft C makefile - makefile.vcwin32 => makefile for Microsoft Visual C++ 4.0 and - later (does not use assembler code) - makefile.os2 => OS/2 Makefile (gcc and emx, requires pngos2.def) - png32ce.def => module definition for makefile.cegccg - pngos2.def => OS/2 module definition file used by - makefile.os2 - pngwin.def => module definition file used by - makefile.cygwin and makefile.mingw - makefile.watcom => Watcom 10a+ Makefile, 32-bit flat memory model - makevms.com => VMS build script - SCOPTIONS.ppc => Used with smakefile.ppc + (see scripts/README.txt for the list of scripts) Good luck, and happy coding. diff --git a/project/jni/png/TODO b/project/jni/png/TODO index 0af8d827a..6e1f028bd 100644 --- a/project/jni/png/TODO +++ b/project/jni/png/TODO @@ -2,14 +2,12 @@ TODO - list of things to do for libpng: Final bug fixes. -Improve API by hiding the png_struct and png_info structs. -Finish work on the no-floating-point version (including gamma compensation) Better C++ wrapper/full C++ implementation? Fix problem with C++ and EXTERN "C". cHRM transformation. -Improve setjmp/longjmp usage or remove it in favor of returning error codes. +Remove setjmp/longjmp usage in favor of returning error codes. Add "grayscale->palette" transformation and "palette->grayscale" detection. -Improved quantizing and dithering. +Improved dithering. Multi-lingual error and warning message support. Complete sRGB transformation (presently it simply uses gamma=0.45455). Man pages for function calls. @@ -18,14 +16,12 @@ Better filter selection (counting huffman bits/precompression? filter inertia? filter costs?). Histogram creation. Text conversion between different code pages (Latin-1 -> Mac and DOS). -Build gamma tables using fixed point (and do away with floating point entirely). Avoid building gamma tables whenever possible. Use greater precision when changing to linear gamma for compositing against background and doing rgb-to-gray transformation. Investigate pre-incremented loop counters and other loop constructions. Add interpolated method of handling interlacing. -Provide for conditional compilation of 16-bit support (except for the - initial stripping down to 8-bits when reading a 16-bit PNG datastream). Switch to the simpler zlib (zlib/libpng) license if legally possible. +Extend pngvalid.c to validate more of the libpng transformations. */ diff --git a/project/jni/png/include/png.h b/project/jni/png/include/png.h index 1fa310daa..71c2ab675 100644 --- a/project/jni/png/include/png.h +++ b/project/jni/png/include/png.h @@ -1,26 +1,26 @@ /* png.h - header file for PNG reference library * - * libpng version 1.4.6beta06 - January 23, 2011 - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * libpng version 1.6.6 - September 16, 2013 + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * * This code is released under the libpng license (See LICENSE, below) * * Authors and maintainers: - * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat - * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger - * libpng versions 0.97, January 1998, through 1.4.6beta06 - January 23, 2011: Glenn - * See also "Contributing Authors", below. + * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat + * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger + * libpng versions 0.97, January 1998, through 1.6.6 - September 16, 2013: Glenn + * See also "Contributing Authors", below. * * Note about libpng version numbers: * - * Due to various miscommunications, unforeseen code incompatibilities - * and occasional factors outside the authors' control, version numbering - * on the library has not always been consistent and straightforward. - * The following table summarizes matters since version 0.89c, which was - * the first widely used release: + * Due to various miscommunications, unforeseen code incompatibilities + * and occasional factors outside the authors' control, version numbering + * on the library has not always been consistent and straightforward. + * The following table summarizes matters since version 0.89c, which was + * the first widely used release: * * source png.h png.h shared-lib * version string int version @@ -137,45 +137,73 @@ * 1.4.1beta01-03 14 10401 14.so.14.1[.0] * 1.4.1rc01 14 10401 14.so.14.1[.0] * 1.4.1beta04-12 14 10401 14.so.14.1[.0] - * 1.4.1rc02-04 14 10401 14.so.14.1[.0] * 1.4.1 14 10401 14.so.14.1[.0] - * 1.4.2beta01 14 10402 14.so.14.2[.0] - * 1.4.2rc02-06 14 10402 14.so.14.2[.0] * 1.4.2 14 10402 14.so.14.2[.0] - * 1.4.3beta01-05 14 10403 14.so.14.3[.0] - * 1.4.3rc01-03 14 10403 14.so.14.3[.0] * 1.4.3 14 10403 14.so.14.3[.0] - * 1.4.4beta01-08 14 10404 14.so.14.4[.0] - * 1.4.4rc01-05 14 10404 14.so.14.4[.0] * 1.4.4 14 10404 14.so.14.4[.0] - * 1.4.5beta01-04 14 10405 14.so.14.5[.0] - * 1.4.5rc01 14 10405 14.so.14.5[.0] - * 1.4.5beta05-07 14 10405 14.so.14.5[.0] - * 1.4.5rc02-03 14 10405 14.so.14.5[.0] - * 1.4.5 14 10405 14.so.14.5[.0] - * 1.4.6beta01-06 14 10406 14.so.14.6[.0] - * 1.4.6rc01 14 10406 14.so.14.6[.0] + * 1.5.0beta01-58 15 10500 15.so.15.0[.0] + * 1.5.0rc01-07 15 10500 15.so.15.0[.0] + * 1.5.0 15 10500 15.so.15.0[.0] + * 1.5.1beta01-11 15 10501 15.so.15.1[.0] + * 1.5.1rc01-02 15 10501 15.so.15.1[.0] + * 1.5.1 15 10501 15.so.15.1[.0] + * 1.5.2beta01-03 15 10502 15.so.15.2[.0] + * 1.5.2rc01-03 15 10502 15.so.15.2[.0] + * 1.5.2 15 10502 15.so.15.2[.0] + * 1.5.3beta01-10 15 10503 15.so.15.3[.0] + * 1.5.3rc01-02 15 10503 15.so.15.3[.0] + * 1.5.3beta11 15 10503 15.so.15.3[.0] + * 1.5.3 [omitted] + * 1.5.4beta01-08 15 10504 15.so.15.4[.0] + * 1.5.4rc01 15 10504 15.so.15.4[.0] + * 1.5.4 15 10504 15.so.15.4[.0] + * 1.5.5beta01-08 15 10505 15.so.15.5[.0] + * 1.5.5rc01 15 10505 15.so.15.5[.0] + * 1.5.5 15 10505 15.so.15.5[.0] + * 1.5.6beta01-07 15 10506 15.so.15.6[.0] + * 1.5.6rc01-03 15 10506 15.so.15.6[.0] + * 1.5.6 15 10506 15.so.15.6[.0] + * 1.5.7beta01-05 15 10507 15.so.15.7[.0] + * 1.5.7rc01-03 15 10507 15.so.15.7[.0] + * 1.5.7 15 10507 15.so.15.7[.0] + * 1.6.0beta01-40 16 10600 16.so.16.0[.0] + * 1.6.0rc01-08 16 10600 16.so.16.0[.0] + * 1.6.0 16 10600 16.so.16.0[.0] + * 1.6.1beta01-09 16 10601 16.so.16.1[.0] + * 1.6.1rc01 16 10601 16.so.16.1[.0] + * 1.6.1 16 10601 16.so.16.1[.0] + * 1.6.2beta01 16 10602 16.so.16.2[.0] + * 1.6.2rc01-06 16 10602 16.so.16.2[.0] + * 1.6.2 16 10602 16.so.16.2[.0] + * 1.6.3beta01-11 16 10603 16.so.16.3[.0] + * 1.6.3rc01 16 10603 16.so.16.3[.0] + * 1.6.3 16 10603 16.so.16.3[.0] + * 1.6.4beta01-02 16 10604 16.so.16.4[.0] + * 1.6.4rc01 16 10604 16.so.16.4[.0] + * 1.6.4 16 10604 16.so.16.4[.0] + * 1.6.5 16 10605 16.so.16.5[.0] + * 1.6.6 16 10606 16.so.16.6[.0] * - * Henceforth the source version will match the shared-library major - * and minor numbers; the shared-library major version number will be - * used for changes in backward compatibility, as it is intended. The - * PNG_LIBPNG_VER macro, which is not used within libpng but is available - * for applications, is an unsigned integer of the form xyyzz corresponding - * to the source version x.y.z (leading zeros in y and z). Beta versions - * were given the previous public release number plus a letter, until - * version 1.0.6j; from then on they were given the upcoming public - * release number plus "betaNN" or "rcN". + * Henceforth the source version will match the shared-library major + * and minor numbers; the shared-library major version number will be + * used for changes in backward compatibility, as it is intended. The + * PNG_LIBPNG_VER macro, which is not used within libpng but is available + * for applications, is an unsigned integer of the form xyyzz corresponding + * to the source version x.y.z (leading zeros in y and z). Beta versions + * were given the previous public release number plus a letter, until + * version 1.0.6j; from then on they were given the upcoming public + * release number plus "betaNN" or "rcNN". * - * Binary incompatibility exists only when applications make direct access - * to the info_ptr or png_ptr members through png.h, and the compiled - * application is loaded with a different version of the library. + * Binary incompatibility exists only when applications make direct access + * to the info_ptr or png_ptr members through png.h, and the compiled + * application is loaded with a different version of the library. * - * DLLNUM will change each time there are forward or backward changes - * in binary compatibility (e.g., when a new feature is added). + * DLLNUM will change each time there are forward or backward changes + * in binary compatibility (e.g., when a new feature is added). * - * See libpng.txt or libpng.3 for more information. The PNG specification - * is available as a W3C Recommendation and as an ISO Specification, - * , and the - * application must include this before png.h to obtain the definition - * of jmp_buf. +/* This must match the function definition in , and the application + * must include this before png.h to obtain the definition of jmp_buf. The + * function is required to be PNG_NORETURN, but this is not checked. If the + * function does return the application will crash via an abort() or similar + * system level call. + * + * If you get a warning here while building the library you may need to make + * changes to ensure that pnglibconf.h records the calling convention used by + * your compiler. This may be very difficult - try using a different compiler + * to build the library! */ -typedef void (PNGAPI *png_longjmp_ptr) PNGARG((jmp_buf, int)); +PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef); #endif /* Transform masks for the high-level interface */ @@ -1086,453 +955,92 @@ typedef void (PNGAPI *png_longjmp_ptr) PNGARG((jmp_buf, int)); #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ /* Added to libpng-1.4.0 */ #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ +/* Added to libpng-1.5.4 */ +#define PNG_TRANSFORM_EXPAND_16 0x4000 /* read only */ +#define PNG_TRANSFORM_SCALE_16 0x8000 /* read only */ /* Flags for MNG supported features */ #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 #define PNG_FLAG_MNG_FILTER_64 0x04 #define PNG_ALL_MNG_FEATURES 0x05 -typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_alloc_size_t)); -typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); - -/* The structure that holds the information to read and write PNG files. - * The only people who need to care about what is inside of this are the - * people who will be modifying the library for their own special needs. - * It should NOT be accessed directly by an application, except to store - * the jmp_buf. +/* NOTE: prior to 1.5 these functions had no 'API' style declaration, + * this allowed the zlib default functions to be used on Windows + * platforms. In 1.5 the zlib default malloc (which just calls malloc and + * ignores the first argument) should be completely compatible with the + * following. */ +typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp, + png_alloc_size_t)); +typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp)); -struct png_struct_def -{ -#ifdef PNG_SETJMP_SUPPORTED - jmp_buf jmpbuf PNG_DEPSTRUCT; /* used in png_error */ - png_longjmp_ptr longjmp_fn PNG_DEPSTRUCT;/* setjmp non-local goto - function. */ -#endif - png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing - errors and aborting */ - png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing - warnings */ - png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for - error functions */ - png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing - output data */ - png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading - input data */ - png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct - for I/O functions */ - -#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED - png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read - transform */ -#endif - -#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED - png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write - transform */ -#endif - -/* These were added in libpng-1.0.2 */ -#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED -#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ - defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) - png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct - for user transform */ - png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user - transformed pixels */ - png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user - transformed pixels */ -#endif -#endif - - png_uint_32 mode PNG_DEPSTRUCT; /* tells us where we are in - the PNG file */ - png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various - things to libpng */ - png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations - to perform */ - - z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression - structure (below) */ - png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */ - png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */ - int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */ - int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */ - int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window - bits */ - int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory - level */ - int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression - strategy */ - - png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */ - png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */ - png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */ - png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */ - png_size_t rowbytes PNG_DEPSTRUCT; /* size of row in bytes */ -#if 0 /* Replaced with the following in libpng-1.4.1 */ - png_size_t irowbytes PNG_DEPSTRUCT; -#endif -/* Added in libpng-1.4.1 */ -#ifdef PNG_USER_LIMITS_SUPPORTED - /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk - * can occupy when decompressed. 0 means unlimited. - * We will change the typedef from png_size_t to png_alloc_size_t - * in libpng-1.6.0 - */ - png_alloc_size_t user_chunk_malloc_max PNG_DEPSTRUCT; -#endif - png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced - row in pixels */ - png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */ - png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous - (unfiltered) row */ - png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current - (unfiltered) row */ - png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row - when filtering */ - png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row - when filtering */ - png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row - when filtering */ - png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row - when filtering */ - png_row_info row_info PNG_DEPSTRUCT; /* used for transformation - routines */ - - png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */ - png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */ - png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */ - png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in - palette */ - png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */ - png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current - chunk */ - png_byte compression PNG_DEPSTRUCT; /* file compression type - (always 0) */ - png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */ - png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE, - PNG_INTERLACE_ADAM7 */ - png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */ - png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see - PNG_FILTER_ below ) */ - png_byte color_type PNG_DEPSTRUCT; /* color type of file */ - png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */ - png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */ - png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ - png_byte channels PNG_DEPSTRUCT; /* number of channels in file */ - png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */ - png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from - start of file */ - -#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) - png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel - expansion */ -#endif - -#ifdef PNG_bKGD_SUPPORTED - png_byte background_gamma_type PNG_DEPSTRUCT; -# ifdef PNG_FLOATING_POINT_SUPPORTED - float background_gamma PNG_DEPSTRUCT; -# endif - png_color_16 background PNG_DEPSTRUCT; /* background color in - screen gamma space */ -#ifdef PNG_READ_GAMMA_SUPPORTED - png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized - to gamma 1.0 */ -#endif -#endif /* PNG_bKGD_SUPPORTED */ - -#ifdef PNG_WRITE_FLUSH_SUPPORTED - png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing - output */ - png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush, - 0 - no flush */ - png_uint_32 flush_rows PNG_DEPSTRUCT; /* number of rows written since - last flush */ -#endif - -#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) - int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits - 16-bit gamma */ -#ifdef PNG_FLOATING_POINT_SUPPORTED - float gamma PNG_DEPSTRUCT; /* file gamma value */ - float screen_gamma PNG_DEPSTRUCT; /* screen gamma value - (display_exponent) */ -#endif -#endif - -#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) - png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit - depth files */ - png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ - png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ - png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit - depth files */ - png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to - screen */ - png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ -#endif - -#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) - png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in each - available channel */ -#endif - -#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) - png_color_8 shift PNG_DEPSTRUCT; /* shift for significant bit - tranformation */ -#endif - -#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ - || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) - png_bytep trans_alpha PNG_DEPSTRUCT; /* alpha values for - paletted files */ - png_color_16 trans_color PNG_DEPSTRUCT; /* transparent color for - non-paletted files */ -#endif - - png_read_status_ptr read_row_fn PNG_DEPSTRUCT; /* called after each - row is decoded */ - png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each - row is encoded */ -#ifdef PNG_PROGRESSIVE_READ_SUPPORTED - png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header - data fully read */ - png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each - prog. row is decoded */ - png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image - is complete */ - png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in - save_buffer */ - png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously - read data */ - png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in - current_buffer */ - png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently - used data */ - png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input - chunk */ - png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in - input data */ - png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now - in save_buffer */ - png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of - save_buffer */ - png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of - available input data */ - png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now - in current_buffer */ - int process_mode PNG_DEPSTRUCT; /* what push library - is currently doing */ - int cur_palette PNG_DEPSTRUCT; /* current push library - palette index */ - -# ifdef PNG_TEXT_SUPPORTED - png_size_t current_text_size PNG_DEPSTRUCT; /* current size of - text input data */ - png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left - to read in input */ - png_charp current_text PNG_DEPSTRUCT; /* current text chunk - buffer */ - png_charp current_text_ptr PNG_DEPSTRUCT; /* current location - in current_text */ -# endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */ - -#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ - -#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) -/* For the Borland special 64K segment handler */ - png_bytepp offset_table_ptr PNG_DEPSTRUCT; - png_bytep offset_table PNG_DEPSTRUCT; - png_uint_16 offset_table_number PNG_DEPSTRUCT; - png_uint_16 offset_table_count PNG_DEPSTRUCT; - png_uint_16 offset_table_count_free PNG_DEPSTRUCT; -#endif - -#ifdef PNG_READ_QUANTIZE_SUPPORTED - png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for quantizing */ - png_bytep quantize_index PNG_DEPSTRUCT; /* index translation for palette - files */ -#endif - -#if defined(PNG_READ_QUANTIZE_SUPPORTED) || defined(PNG_hIST_SUPPORTED) - png_uint_16p hist PNG_DEPSTRUCT; /* histogram */ -#endif - -#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED - png_byte heuristic_method PNG_DEPSTRUCT; /* heuristic for row - filter selection */ - png_byte num_prev_filters PNG_DEPSTRUCT; /* number of weights - for previous rows */ - png_bytep prev_filters PNG_DEPSTRUCT; /* filter type(s) of - previous row(s) */ - png_uint_16p filter_weights PNG_DEPSTRUCT; /* weight(s) for previous - line(s) */ - png_uint_16p inv_filter_weights PNG_DEPSTRUCT; /* 1/weight(s) for - previous line(s) */ - png_uint_16p filter_costs PNG_DEPSTRUCT; /* relative filter - calculation cost */ - png_uint_16p inv_filter_costs PNG_DEPSTRUCT; /* 1/relative filter - calculation cost */ -#endif - -#ifdef PNG_TIME_RFC1123_SUPPORTED - png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */ -#endif - -/* New members added in libpng-1.0.6 */ - - png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is - responsible for freeing */ - -#ifdef PNG_USER_CHUNKS_SUPPORTED - png_voidp user_chunk_ptr PNG_DEPSTRUCT; - png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read - chunk handler */ -#endif - -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - int num_chunk_list PNG_DEPSTRUCT; - png_bytep chunk_list PNG_DEPSTRUCT; -#endif - -/* New members added in libpng-1.0.3 */ -#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED - png_byte rgb_to_gray_status PNG_DEPSTRUCT; - /* These were changed from png_byte in libpng-1.0.6 */ - png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT; - png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT; - png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT; -#endif - -/* New member added in libpng-1.0.4 (renamed in 1.0.9) */ -#if defined(PNG_MNG_FEATURES_SUPPORTED) || \ - defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ - defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) -/* Changed from png_byte to png_uint_32 at version 1.2.0 */ - png_uint_32 mng_features_permitted PNG_DEPSTRUCT; -#endif - -/* New member added in libpng-1.0.7 */ -#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) - png_fixed_point int_gamma PNG_DEPSTRUCT; -#endif - -/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ -#ifdef PNG_MNG_FEATURES_SUPPORTED - png_byte filter_type PNG_DEPSTRUCT; -#endif - -/* New members added in libpng-1.2.0 */ - -/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ -#ifdef PNG_USER_MEM_SUPPORTED - png_voidp mem_ptr PNG_DEPSTRUCT; /* user supplied struct for - mem functions */ - png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for - allocating memory */ - png_free_ptr free_fn PNG_DEPSTRUCT; /* function for - freeing memory */ -#endif - -/* New member added in libpng-1.0.13 and 1.2.0 */ - png_bytep big_row_buf PNG_DEPSTRUCT; /* buffer to save current - (unfiltered) row */ - -#ifdef PNG_READ_QUANTIZE_SUPPORTED -/* The following three members were added at version 1.0.14 and 1.2.4 */ - png_bytep quantize_sort PNG_DEPSTRUCT; /* working sort array */ - png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original - index currently is - in the palette */ - png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index - points to this - palette color */ -#endif - -/* New members added in libpng-1.0.16 and 1.2.6 */ - png_byte compression_type PNG_DEPSTRUCT; - -#ifdef PNG_USER_LIMITS_SUPPORTED - png_uint_32 user_width_max PNG_DEPSTRUCT; - png_uint_32 user_height_max PNG_DEPSTRUCT; - /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown - * chunks that can be stored (0 means unlimited). - */ - png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT; -#endif - -/* New member added in libpng-1.0.25 and 1.2.17 */ -#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED - /* Storage for unknown chunk that the library doesn't recognize. */ - png_unknown_chunk unknown_chunk PNG_DEPSTRUCT; -#endif - -/* New members added in libpng-1.2.26 */ - png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT; - png_uint_32 old_prev_row_size PNG_DEPSTRUCT; - -/* New member added in libpng-1.2.30 */ - png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */ - -#ifdef PNG_IO_STATE_SUPPORTED -/* New member added in libpng-1.4.0 */ - png_uint_32 io_state PNG_DEPSTRUCT; -#endif -}; - - -/* This triggers a compiler error in png.c, if png.c and png.h - * do not agree upon the version number. - */ -typedef png_structp version_1_4_6beta06; - -typedef png_struct FAR * FAR * png_structpp; - -/* Here are the function definitions most commonly used. This is not - * the place to find out how to use libpng. See libpng.txt for the +/* Section 3: exported functions + * Here are the function definitions most commonly used. This is not + * the place to find out how to use libpng. See libpng-manual.txt for the * full explanation, see example.c for the summary. This just provides * a simple one line description of the use of each function. + * + * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in + * pngconf.h and in the *.dfn files in the scripts directory. + * + * PNG_EXPORT(ordinal, type, name, (args)); + * + * ordinal: ordinal that is used while building + * *.def files. The ordinal value is only + * relevant when preprocessing png.h with + * the *.dfn files for building symbol table + * entries, and are removed by pngconf.h. + * type: return type of the function + * name: function name + * args: function arguments, with types + * + * When we wish to append attributes to a function prototype we use + * the PNG_EXPORTA() macro instead. + * + * PNG_EXPORTA(ordinal, type, name, (args), attributes); + * + * ordinal, type, name, and args: same as in PNG_EXPORT(). + * attributes: function attributes */ /* Returns the version number of the library */ -PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); +PNG_EXPORT(1, png_uint_32, png_access_version_number, (void)); /* Tell lib we have already handled the first magic bytes. * Handling more than 8 bytes from the beginning of the file is an error. */ -PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, - int num_bytes)); +PNG_EXPORT(2, void, png_set_sig_bytes, (png_structrp png_ptr, int num_bytes)); /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a * PNG file. Returns zero if the supplied bytes match the 8-byte PNG * signature, and non-zero otherwise. Having num_to_check == 0 or * start > 7 will always fail (ie return non-zero). */ -PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, - png_size_t num_to_check)); +PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start, + png_size_t num_to_check)); /* Simple signature checking function. This is the same as calling * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). */ -#define png_check_sig(sig,n) !png_sig_cmp((sig), 0, (n)) +#define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n)) /* Allocate and initialize png_ptr struct for reading, and any other memory. */ -PNG_EXPORT(png_structp,png_create_read_struct) - PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, - png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; +PNG_EXPORTA(4, png_structp, png_create_read_struct, + (png_const_charp user_png_ver, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warn_fn), + PNG_ALLOCATED); /* Allocate and initialize png_ptr struct for writing, and any other memory */ -PNG_EXPORT(png_structp,png_create_write_struct) - PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, - png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; +PNG_EXPORTA(5, png_structp, png_create_write_struct, + (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, + png_error_ptr warn_fn), + PNG_ALLOCATED); -PNG_EXPORT(png_size_t,png_get_compression_buffer_size) - PNGARG((png_const_structp png_ptr)); +PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size, + (png_const_structrp png_ptr)); -PNG_EXPORT(void,png_set_compression_buffer_size) - PNGARG((png_structp png_ptr, png_size_t size)); +PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structrp png_ptr, + png_size_t size)); /* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp * match up. @@ -1545,288 +1053,559 @@ PNG_EXPORT(void,png_set_compression_buffer_size) * allocated by the library - the call will return NULL on a mismatch * indicating an ABI mismatch. */ -PNG_EXPORT(jmp_buf*, png_set_longjmp_fn) - PNGARG((png_structp png_ptr, png_longjmp_ptr longjmp_fn, size_t - jmp_buf_size)); +PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structrp png_ptr, + png_longjmp_ptr longjmp_fn, size_t jmp_buf_size)); # define png_jmpbuf(png_ptr) \ - (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf))) + (*png_set_longjmp_fn((png_ptr), longjmp, (sizeof (jmp_buf)))) #else # define png_jmpbuf(png_ptr) \ - (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP) + (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP) #endif +/* This function should be used by libpng applications in place of + * longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it + * will use it; otherwise it will call PNG_ABORT(). This function was + * added in libpng-1.5.0. + */ +PNG_EXPORTA(9, void, png_longjmp, (png_const_structrp png_ptr, int val), + PNG_NORETURN); #ifdef PNG_READ_SUPPORTED /* Reset the compression stream */ -PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); +PNG_EXPORTA(10, int, png_reset_zstream, (png_structrp png_ptr), PNG_DEPRECATED); #endif /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ #ifdef PNG_USER_MEM_SUPPORTED -PNG_EXPORT(png_structp,png_create_read_struct_2) - PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, - png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, - png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; -PNG_EXPORT(png_structp,png_create_write_struct_2) - PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, - png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, - png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; +PNG_EXPORTA(11, png_structp, png_create_read_struct_2, + (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, + png_error_ptr warn_fn, + png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), + PNG_ALLOCATED); +PNG_EXPORTA(12, png_structp, png_create_write_struct_2, + (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, + png_error_ptr warn_fn, + png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), + PNG_ALLOCATED); #endif /* Write the PNG file signature. */ -PNG_EXPORT(void,png_write_sig) PNGARG((png_structp png_ptr)); +PNG_EXPORT(13, void, png_write_sig, (png_structrp png_ptr)); /* Write a PNG chunk - size, type, (optional) data, CRC. */ -PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, - png_bytep chunk_name, png_bytep data, png_size_t length)); +PNG_EXPORT(14, void, png_write_chunk, (png_structrp png_ptr, png_const_bytep + chunk_name, png_const_bytep data, png_size_t length)); /* Write the start of a PNG chunk - length and chunk name. */ -PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, - png_bytep chunk_name, png_uint_32 length)); +PNG_EXPORT(15, void, png_write_chunk_start, (png_structrp png_ptr, + png_const_bytep chunk_name, png_uint_32 length)); /* Write the data of a PNG chunk started with png_write_chunk_start(). */ -PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, - png_bytep data, png_size_t length)); +PNG_EXPORT(16, void, png_write_chunk_data, (png_structrp png_ptr, + png_const_bytep data, png_size_t length)); /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ -PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); +PNG_EXPORT(17, void, png_write_chunk_end, (png_structrp png_ptr)); /* Allocate and initialize the info structure */ -PNG_EXPORT(png_infop,png_create_info_struct) - PNGARG((png_structp png_ptr)) PNG_ALLOCATED; +PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_const_structrp png_ptr), + PNG_ALLOCATED); -PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, - png_size_t png_info_struct_size)); +/* DEPRECATED: this function allowed init structures to be created using the + * default allocation method (typically malloc). Use is deprecated in 1.6.0 and + * the API will be removed in the future. + */ +PNG_EXPORTA(19, void, png_info_init_3, (png_infopp info_ptr, + png_size_t png_info_struct_size), PNG_DEPRECATED); /* Writes all the PNG information before the image. */ -PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, - png_infop info_ptr)); -PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, - png_infop info_ptr)); +PNG_EXPORT(20, void, png_write_info_before_PLTE, + (png_structrp png_ptr, png_const_inforp info_ptr)); +PNG_EXPORT(21, void, png_write_info, + (png_structrp png_ptr, png_const_inforp info_ptr)); #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read the information before the actual image data. */ -PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, - png_infop info_ptr)); +PNG_EXPORT(22, void, png_read_info, + (png_structrp png_ptr, png_inforp info_ptr)); #endif #ifdef PNG_TIME_RFC1123_SUPPORTED -PNG_EXPORT(png_charp,png_convert_to_rfc1123) - PNGARG((png_structp png_ptr, png_timep ptime)); + /* Convert to a US string format: there is no localization support in this + * routine. The original implementation used a 29 character buffer in + * png_struct, this will be removed in future versions. + */ +#if PNG_LIBPNG_VER < 10700 +/* To do: remove this from libpng17 (and from libpng17/png.c and pngstruct.h) */ +PNG_EXPORTA(23, png_const_charp, png_convert_to_rfc1123, (png_structrp png_ptr, + png_const_timep ptime),PNG_DEPRECATED); +#endif +PNG_EXPORT(241, int, png_convert_to_rfc1123_buffer, (char out[29], + png_const_timep ptime)); #endif #ifdef PNG_CONVERT_tIME_SUPPORTED /* Convert from a struct tm to png_time */ -PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, - struct tm FAR * ttime)); +PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime, + const struct tm * ttime)); /* Convert from time_t to png_time. Uses gmtime() */ -PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, - time_t ttime)); +PNG_EXPORT(25, void, png_convert_from_time_t, (png_timep ptime, time_t ttime)); #endif /* PNG_CONVERT_tIME_SUPPORTED */ #ifdef PNG_READ_EXPAND_SUPPORTED /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ -PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); -PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp - png_ptr)); -PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); -PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); +PNG_EXPORT(26, void, png_set_expand, (png_structrp png_ptr)); +PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structrp png_ptr)); +PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structrp png_ptr)); +PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structrp png_ptr)); +#endif + +#ifdef PNG_READ_EXPAND_16_SUPPORTED +/* Expand to 16-bit channels, forces conversion of palette to RGB and expansion + * of a tRNS chunk if present. + */ +PNG_EXPORT(221, void, png_set_expand_16, (png_structrp png_ptr)); #endif #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) /* Use blue, green, red order for pixels. */ -PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); +PNG_EXPORT(30, void, png_set_bgr, (png_structrp png_ptr)); #endif #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED /* Expand the grayscale to 24-bit RGB if necessary. */ -PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); +PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structrp png_ptr)); #endif #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED /* Reduce RGB to grayscale. */ -#ifdef PNG_FLOATING_POINT_SUPPORTED -PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, - int error_action, double red, double green )); -#endif -PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, - int error_action, png_fixed_point red, png_fixed_point green )); -PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_const_structp - png_ptr)); +#define PNG_ERROR_ACTION_NONE 1 +#define PNG_ERROR_ACTION_WARN 2 +#define PNG_ERROR_ACTION_ERROR 3 +#define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/ + +PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structrp png_ptr, + int error_action, double red, double green)) +PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structrp png_ptr, + int error_action, png_fixed_point red, png_fixed_point green)) + +PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structrp + png_ptr)); #endif -PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, - png_colorp palette)); +#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED +PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth, + png_colorp palette)); +#endif + +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED +/* How the alpha channel is interpreted - this affects how the color channels of + * a PNG file are returned when an alpha channel, or tRNS chunk in a palette + * file, is present. + * + * This has no effect on the way pixels are written into a PNG output + * datastream. The color samples in a PNG datastream are never premultiplied + * with the alpha samples. + * + * The default is to return data according to the PNG specification: the alpha + * channel is a linear measure of the contribution of the pixel to the + * corresponding composited pixel. The gamma encoded color channels must be + * scaled according to the contribution and to do this it is necessary to undo + * the encoding, scale the color values, perform the composition and reencode + * the values. This is the 'PNG' mode. + * + * The alternative is to 'associate' the alpha with the color information by + * storing color channel values that have been scaled by the alpha. The + * advantage is that the color channels can be resampled (the image can be + * scaled) in this form. The disadvantage is that normal practice is to store + * linear, not (gamma) encoded, values and this requires 16-bit channels for + * still images rather than the 8-bit channels that are just about sufficient if + * gamma encoding is used. In addition all non-transparent pixel values, + * including completely opaque ones, must be gamma encoded to produce the final + * image. This is the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' mode (the + * latter being the two common names for associated alpha color channels.) + * + * Since it is not necessary to perform arithmetic on opaque color values so + * long as they are not to be resampled and are in the final color space it is + * possible to optimize the handling of alpha by storing the opaque pixels in + * the PNG format (adjusted for the output color space) while storing partially + * opaque pixels in the standard, linear, format. The accuracy required for + * standard alpha composition is relatively low, because the pixels are + * isolated, therefore typically the accuracy loss in storing 8-bit linear + * values is acceptable. (This is not true if the alpha channel is used to + * simulate transparency over large areas - use 16 bits or the PNG mode in + * this case!) This is the 'OPTIMIZED' mode. For this mode a pixel is + * treated as opaque only if the alpha value is equal to the maximum value. + * + * The final choice is to gamma encode the alpha channel as well. This is + * broken because, in practice, no implementation that uses this choice + * correctly undoes the encoding before handling alpha composition. Use this + * choice only if other serious errors in the software or hardware you use + * mandate it; the typical serious error is for dark halos to appear around + * opaque areas of the composited PNG image because of arithmetic overflow. + * + * The API function png_set_alpha_mode specifies which of these choices to use + * with an enumerated 'mode' value and the gamma of the required output: + */ +#define PNG_ALPHA_PNG 0 /* according to the PNG standard */ +#define PNG_ALPHA_STANDARD 1 /* according to Porter/Duff */ +#define PNG_ALPHA_ASSOCIATED 1 /* as above; this is the normal practice */ +#define PNG_ALPHA_PREMULTIPLIED 1 /* as above */ +#define PNG_ALPHA_OPTIMIZED 2 /* 'PNG' for opaque pixels, else 'STANDARD' */ +#define PNG_ALPHA_BROKEN 3 /* the alpha channel is gamma encoded */ + +PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structrp png_ptr, int mode, + double output_gamma)) +PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structrp png_ptr, + int mode, png_fixed_point output_gamma)) +#endif + +#if defined(PNG_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED) +/* The output_gamma value is a screen gamma in libpng terminology: it expresses + * how to decode the output values, not how they are encoded. The values used + * correspond to the normal numbers used to describe the overall gamma of a + * computer display system; for example 2.2 for an sRGB conformant system. The + * values are scaled by 100000 in the _fixed version of the API (so 220000 for + * sRGB.) + * + * The inverse of the value is always used to provide a default for the PNG file + * encoding if it has no gAMA chunk and if png_set_gamma() has not been called + * to override the PNG gamma information. + * + * When the ALPHA_OPTIMIZED mode is selected the output gamma is used to encode + * opaque pixels however pixels with lower alpha values are not encoded, + * regardless of the output gamma setting. + * + * When the standard Porter Duff handling is requested with mode 1 the output + * encoding is set to be linear and the output_gamma value is only relevant + * as a default for input data that has no gamma information. The linear output + * encoding will be overridden if png_set_gamma() is called - the results may be + * highly unexpected! + * + * The following numbers are derived from the sRGB standard and the research + * behind it. sRGB is defined to be approximated by a PNG gAMA chunk value of + * 0.45455 (1/2.2) for PNG. The value implicitly includes any viewing + * correction required to take account of any differences in the color + * environment of the original scene and the intended display environment; the + * value expresses how to *decode* the image for display, not how the original + * data was *encoded*. + * + * sRGB provides a peg for the PNG standard by defining a viewing environment. + * sRGB itself, and earlier TV standards, actually use a more complex transform + * (a linear portion then a gamma 2.4 power law) than PNG can express. (PNG is + * limited to simple power laws.) By saying that an image for direct display on + * an sRGB conformant system should be stored with a gAMA chunk value of 45455 + * (11.3.3.2 and 11.3.3.5 of the ISO PNG specification) the PNG specification + * makes it possible to derive values for other display systems and + * environments. + * + * The Mac value is deduced from the sRGB based on an assumption that the actual + * extra viewing correction used in early Mac display systems was implemented as + * a power 1.45 lookup table. + * + * Any system where a programmable lookup table is used or where the behavior of + * the final display device characteristics can be changed requires system + * specific code to obtain the current characteristic. However this can be + * difficult and most PNG gamma correction only requires an approximate value. + * + * By default, if png_set_alpha_mode() is not called, libpng assumes that all + * values are unencoded, linear, values and that the output device also has a + * linear characteristic. This is only very rarely correct - it is invariably + * better to call png_set_alpha_mode() with PNG_DEFAULT_sRGB than rely on the + * default if you don't know what the right answer is! + * + * The special value PNG_GAMMA_MAC_18 indicates an older Mac system (pre Mac OS + * 10.6) which used a correction table to implement a somewhat lower gamma on an + * otherwise sRGB system. + * + * Both these values are reserved (not simple gamma values) in order to allow + * more precise correction internally in the future. + * + * NOTE: the following values can be passed to either the fixed or floating + * point APIs, but the floating point API will also accept floating point + * values. + */ +#define PNG_DEFAULT_sRGB -1 /* sRGB gamma and color space */ +#define PNG_GAMMA_MAC_18 -2 /* Old Mac '1.8' gamma and color space */ +#define PNG_GAMMA_sRGB 220000 /* Television standards--matches sRGB gamma */ +#define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */ +#endif + +/* The following are examples of calls to png_set_alpha_mode to achieve the + * required overall gamma correction and, where necessary, alpha + * premultiplication. + * + * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); + * This is the default libpng handling of the alpha channel - it is not + * pre-multiplied into the color components. In addition the call states + * that the output is for a sRGB system and causes all PNG files without gAMA + * chunks to be assumed to be encoded using sRGB. + * + * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); + * In this case the output is assumed to be something like an sRGB conformant + * display preceeded by a power-law lookup table of power 1.45. This is how + * early Mac systems behaved. + * + * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR); + * This is the classic Jim Blinn approach and will work in academic + * environments where everything is done by the book. It has the shortcoming + * of assuming that input PNG data with no gamma information is linear - this + * is unlikely to be correct unless the PNG files where generated locally. + * Most of the time the output precision will be so low as to show + * significant banding in dark areas of the image. + * + * png_set_expand_16(pp); + * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB); + * This is a somewhat more realistic Jim Blinn inspired approach. PNG files + * are assumed to have the sRGB encoding if not marked with a gamma value and + * the output is always 16 bits per component. This permits accurate scaling + * and processing of the data. If you know that your input PNG files were + * generated locally you might need to replace PNG_DEFAULT_sRGB with the + * correct value for your system. + * + * png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB); + * If you just need to composite the PNG image onto an existing background + * and if you control the code that does this you can use the optimization + * setting. In this case you just copy completely opaque pixels to the + * output. For pixels that are not completely transparent (you just skip + * those) you do the composition math using png_composite or png_composite_16 + * below then encode the resultant 8-bit or 16-bit values to match the output + * encoding. + * + * Other cases + * If neither the PNG nor the standard linear encoding work for you because + * of the software or hardware you use then you have a big problem. The PNG + * case will probably result in halos around the image. The linear encoding + * will probably result in a washed out, too bright, image (it's actually too + * contrasty.) Try the ALPHA_OPTIMIZED mode above - this will probably + * substantially reduce the halos. Alternatively try: + * + * png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB); + * This option will also reduce the halos, but there will be slight dark + * halos round the opaque parts of the image where the background is light. + * In the OPTIMIZED mode the halos will be light halos where the background + * is dark. Take your pick - the halos are unavoidable unless you can get + * your hardware/software fixed! (The OPTIMIZED approach is slightly + * faster.) + * + * When the default gamma of PNG files doesn't match the output gamma. + * If you have PNG files with no gamma information png_set_alpha_mode allows + * you to provide a default gamma, but it also sets the ouput gamma to the + * matching value. If you know your PNG files have a gamma that doesn't + * match the output you can take advantage of the fact that + * png_set_alpha_mode always sets the output gamma but only sets the PNG + * default if it is not already set: + * + * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); + * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); + * The first call sets both the default and the output gamma values, the + * second call overrides the output gamma without changing the default. This + * is easier than achieving the same effect with png_set_gamma. You must use + * PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will + * fire if more than one call to png_set_alpha_mode and png_set_background is + * made in the same read operation, however multiple calls with PNG_ALPHA_PNG + * are ignored. + */ #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED -PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); +PNG_EXPORT(36, void, png_set_strip_alpha, (png_structrp png_ptr)); #endif #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) -PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); +PNG_EXPORT(37, void, png_set_swap_alpha, (png_structrp png_ptr)); #endif #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) -PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); +PNG_EXPORT(38, void, png_set_invert_alpha, (png_structrp png_ptr)); #endif #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ -PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, - png_uint_32 filler, int flags)); +PNG_EXPORT(39, void, png_set_filler, (png_structrp png_ptr, png_uint_32 filler, + int flags)); /* The values of the PNG_FILLER_ defines should NOT be changed */ -#define PNG_FILLER_BEFORE 0 -#define PNG_FILLER_AFTER 1 +# define PNG_FILLER_BEFORE 0 +# define PNG_FILLER_AFTER 1 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ -PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, - png_uint_32 filler, int flags)); +PNG_EXPORT(40, void, png_set_add_alpha, (png_structrp png_ptr, + png_uint_32 filler, int flags)); #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) /* Swap bytes in 16-bit depth files. */ -PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); +PNG_EXPORT(41, void, png_set_swap, (png_structrp png_ptr)); #endif #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ -PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); +PNG_EXPORT(42, void, png_set_packing, (png_structrp png_ptr)); #endif #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ defined(PNG_WRITE_PACKSWAP_SUPPORTED) /* Swap packing order of pixels in bytes. */ -PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); +PNG_EXPORT(43, void, png_set_packswap, (png_structrp png_ptr)); #endif #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) /* Converts files to legal bit depths. */ -PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, - png_color_8p true_bits)); +PNG_EXPORT(44, void, png_set_shift, (png_structrp png_ptr, png_const_color_8p + true_bits)); #endif #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ defined(PNG_WRITE_INTERLACING_SUPPORTED) -/* Have the code handle the interlacing. Returns the number of passes. */ -PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); +/* Have the code handle the interlacing. Returns the number of passes. + * MUST be called before png_read_update_info or png_start_read_image, + * otherwise it will not have the desired effect. Note that it is still + * necessary to call png_read_row or png_read_rows png_get_image_height + * times for each pass. +*/ +PNG_EXPORT(45, int, png_set_interlace_handling, (png_structrp png_ptr)); #endif #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) /* Invert monochrome files */ -PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); +PNG_EXPORT(46, void, png_set_invert_mono, (png_structrp png_ptr)); #endif #ifdef PNG_READ_BACKGROUND_SUPPORTED -/* Handle alpha and tRNS by replacing with a background color. */ -#ifdef PNG_FLOATING_POINT_SUPPORTED -PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, - png_color_16p background_color, int background_gamma_code, - int need_expand, double background_gamma)); +/* Handle alpha and tRNS by replacing with a background color. Prior to + * libpng-1.5.4 this API must not be called before the PNG file header has been + * read. Doing so will result in unexpected behavior and possible warnings or + * errors if the PNG file contains a bKGD chunk. + */ +PNG_FP_EXPORT(47, void, png_set_background, (png_structrp png_ptr, + png_const_color_16p background_color, int background_gamma_code, + int need_expand, double background_gamma)) +PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structrp png_ptr, + png_const_color_16p background_color, int background_gamma_code, + int need_expand, png_fixed_point background_gamma)) #endif -#define PNG_BACKGROUND_GAMMA_UNKNOWN 0 -#define PNG_BACKGROUND_GAMMA_SCREEN 1 -#define PNG_BACKGROUND_GAMMA_FILE 2 -#define PNG_BACKGROUND_GAMMA_UNIQUE 3 +#ifdef PNG_READ_BACKGROUND_SUPPORTED +# define PNG_BACKGROUND_GAMMA_UNKNOWN 0 +# define PNG_BACKGROUND_GAMMA_SCREEN 1 +# define PNG_BACKGROUND_GAMMA_FILE 2 +# define PNG_BACKGROUND_GAMMA_UNIQUE 3 #endif -#ifdef PNG_READ_16_TO_8_SUPPORTED +#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED +/* Scale a 16-bit depth file down to 8-bit, accurately. */ +PNG_EXPORT(229, void, png_set_scale_16, (png_structrp png_ptr)); +#endif + +#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED +#define PNG_READ_16_TO_8 SUPPORTED /* Name prior to 1.5.4 */ /* Strip the second byte of information from a 16-bit depth file. */ -PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); +PNG_EXPORT(48, void, png_set_strip_16, (png_structrp png_ptr)); #endif #ifdef PNG_READ_QUANTIZE_SUPPORTED /* Turn on quantizing, and reduce the palette to the number of colors - * available. Prior to libpng-1.4.2, this was png_set_dither(). + * available. */ -PNG_EXPORT(void,png_set_quantize) PNGARG((png_structp png_ptr, - png_colorp palette, int num_palette, int maximum_colors, - png_uint_16p histogram, int full_quantize)); +PNG_EXPORT(49, void, png_set_quantize, (png_structrp png_ptr, + png_colorp palette, int num_palette, int maximum_colors, + png_const_uint_16p histogram, int full_quantize)); #endif -/* This migration aid will be removed from libpng-1.5.0 */ -#define png_set_dither png_set_quantize #ifdef PNG_READ_GAMMA_SUPPORTED -/* Handle gamma correction. Screen_gamma=(display_exponent) */ -#ifdef PNG_FLOATING_POINT_SUPPORTED -PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, - double screen_gamma, double default_file_gamma)); -#endif -#endif +/* The threshold on gamma processing is configurable but hard-wired into the + * library. The following is the floating point variant. + */ +#define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001) +/* Handle gamma correction. Screen_gamma=(display_exponent). + * NOTE: this API simply sets the screen and file gamma values. It will + * therefore override the value for gamma in a PNG file if it is called after + * the file header has been read - use with care - call before reading the PNG + * file for best results! + * + * These routines accept the same gamma values as png_set_alpha_mode (described + * above). The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either + * API (floating point or fixed.) Notice, however, that the 'file_gamma' value + * is the inverse of a 'screen gamma' value. + */ +PNG_FP_EXPORT(50, void, png_set_gamma, (png_structrp png_ptr, + double screen_gamma, double override_file_gamma)) +PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structrp png_ptr, + png_fixed_point screen_gamma, png_fixed_point override_file_gamma)) +#endif #ifdef PNG_WRITE_FLUSH_SUPPORTED /* Set how many lines between output flushes - 0 for no flushing */ -PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); +PNG_EXPORT(51, void, png_set_flush, (png_structrp png_ptr, int nrows)); /* Flush the current PNG output buffer */ -PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); +PNG_EXPORT(52, void, png_write_flush, (png_structrp png_ptr)); #endif /* Optional update palette with requested transformations */ -PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); +PNG_EXPORT(53, void, png_start_read_image, (png_structrp png_ptr)); /* Optional call to update the users info structure */ -PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, - png_infop info_ptr)); +PNG_EXPORT(54, void, png_read_update_info, (png_structrp png_ptr, + png_inforp info_ptr)); #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read one or more rows of image data. */ -PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, - png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); +PNG_EXPORT(55, void, png_read_rows, (png_structrp png_ptr, png_bytepp row, + png_bytepp display_row, png_uint_32 num_rows)); #endif #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read a row of data. */ -PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, - png_bytep row, - png_bytep display_row)); +PNG_EXPORT(56, void, png_read_row, (png_structrp png_ptr, png_bytep row, + png_bytep display_row)); #endif #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read the whole image into memory at once. */ -PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, - png_bytepp image)); +PNG_EXPORT(57, void, png_read_image, (png_structrp png_ptr, png_bytepp image)); #endif /* Write a row of image data */ -PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, - png_bytep row)); +PNG_EXPORT(58, void, png_write_row, (png_structrp png_ptr, + png_const_bytep row)); -/* Write a few rows of image data */ -PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, - png_bytepp row, png_uint_32 num_rows)); +/* Write a few rows of image data: (*row) is not written; however, the type + * is declared as writeable to maintain compatibility with previous versions + * of libpng and to allow the 'display_row' array from read_rows to be passed + * unchanged to write_rows. + */ +PNG_EXPORT(59, void, png_write_rows, (png_structrp png_ptr, png_bytepp row, + png_uint_32 num_rows)); /* Write the image data */ -PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, - png_bytepp image)); +PNG_EXPORT(60, void, png_write_image, (png_structrp png_ptr, png_bytepp image)); /* Write the end of the PNG file. */ -PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, - png_infop info_ptr)); +PNG_EXPORT(61, void, png_write_end, (png_structrp png_ptr, + png_inforp info_ptr)); #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read the end of the PNG file. */ -PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, - png_infop info_ptr)); +PNG_EXPORT(62, void, png_read_end, (png_structrp png_ptr, png_inforp info_ptr)); #endif /* Free any memory associated with the png_info_struct */ -PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, - png_infopp info_ptr_ptr)); +PNG_EXPORT(63, void, png_destroy_info_struct, (png_const_structrp png_ptr, + png_infopp info_ptr_ptr)); /* Free any memory associated with the png_struct and the png_info_structs */ -PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp - png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); +PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr, + png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); /* Free any memory associated with the png_struct and the png_info_structs */ -PNG_EXPORT(void,png_destroy_write_struct) - PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); +PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr, + png_infopp info_ptr_ptr)); /* Set the libpng method of handling chunk CRC errors */ -PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, - int crit_action, int ancil_action)); +PNG_EXPORT(66, void, png_set_crc_action, (png_structrp png_ptr, int crit_action, + int ancil_action)); -/* Values for png_set_crc_action() to say how to handle CRC errors in +/* Values for png_set_crc_action() say how to handle CRC errors in * ancillary and critical chunks, and whether to use the data contained * therein. Note that it is impossible to "discard" data in a critical * chunk. For versions prior to 0.90, the action was always error/quit, @@ -1853,8 +1632,8 @@ PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, /* Set the filtering method(s) used by libpng. Currently, the only valid * value for "method" is 0. */ -PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, - int filters)); +PNG_EXPORT(67, void, png_set_filter, (png_structrp png_ptr, int method, + int filters)); /* Flags for png_set_filter() to say which filters to use. The flags * are chosen so that they don't conflict with real filter types @@ -1909,11 +1688,13 @@ PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, * the weights and costs are set to 1.0, this degenerates the WEIGHTED method * to the UNWEIGHTED method, but with added encoding time/computation. */ -#ifdef PNG_FLOATING_POINT_SUPPORTED -PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, - int heuristic_method, int num_weights, png_doublep filter_weights, - png_doublep filter_costs)); -#endif +PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structrp png_ptr, + int heuristic_method, int num_weights, png_const_doublep filter_weights, + png_const_doublep filter_costs)) +PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed, + (png_structrp png_ptr, int heuristic_method, int num_weights, + png_const_fixed_point_p filter_weights, + png_const_fixed_point_p filter_costs)) #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ /* Heuristic used for row filter selection. These defines should NOT be @@ -1924,6 +1705,7 @@ PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ +#ifdef PNG_WRITE_SUPPORTED /* Set the library compression level. Currently, valid values range from * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 * (0 - no compression, 9 - "maximal" compression). Note that tests have @@ -1931,34 +1713,58 @@ PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, * for PNG images, and do considerably fewer caclulations. In the future, * these values may not correspond directly to the zlib compression levels. */ -PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, - int level)); +PNG_EXPORT(69, void, png_set_compression_level, (png_structrp png_ptr, + int level)); -PNG_EXPORT(void,png_set_compression_mem_level) - PNGARG((png_structp png_ptr, int mem_level)); +PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structrp png_ptr, + int mem_level)); -PNG_EXPORT(void,png_set_compression_strategy) - PNGARG((png_structp png_ptr, int strategy)); +PNG_EXPORT(71, void, png_set_compression_strategy, (png_structrp png_ptr, + int strategy)); -PNG_EXPORT(void,png_set_compression_window_bits) - PNGARG((png_structp png_ptr, int window_bits)); +/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a + * smaller value of window_bits if it can do so safely. + */ +PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structrp png_ptr, + int window_bits)); -PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, - int method)); +PNG_EXPORT(73, void, png_set_compression_method, (png_structrp png_ptr, + int method)); +#endif + +#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED +/* Also set zlib parameters for compressing non-IDAT chunks */ +PNG_EXPORT(222, void, png_set_text_compression_level, (png_structrp png_ptr, + int level)); + +PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structrp png_ptr, + int mem_level)); + +PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structrp png_ptr, + int strategy)); + +/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a + * smaller value of window_bits if it can do so safely. + */ +PNG_EXPORT(225, void, png_set_text_compression_window_bits, + (png_structrp png_ptr, int window_bits)); + +PNG_EXPORT(226, void, png_set_text_compression_method, (png_structrp png_ptr, + int method)); +#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */ /* These next functions are called for input/output, memory, and error * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, * and call standard C I/O routines such as fread(), fwrite(), and * fprintf(). These functions can be made to use other I/O routines * at run time for those applications that need to handle I/O in a - * different manner by calling png_set_???_fn(). See libpng.txt for + * different manner by calling png_set_???_fn(). See libpng-manual.txt for * more information. */ #ifdef PNG_STDIO_SUPPORTED /* Initialize the input/output for the PNG file to the default functions. */ -PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, - png_FILE_p fp)); +PNG_EXPORT(74, void, png_init_io, (png_structrp png_ptr, png_FILE_p fp)); #endif /* Replace the (error and abort), and warning functions with user @@ -1969,11 +1775,11 @@ PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, * default function will be used. */ -PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, - png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); +PNG_EXPORT(75, void, png_set_error_fn, (png_structrp png_ptr, + png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); /* Return the user pointer associated with the error functions */ -PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_const_structp png_ptr)); +PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structrp png_ptr)); /* Replace the default data output functions with a user supplied one(s). * If buffered output is not used, then output_flush_fn can be set to NULL. @@ -1985,101 +1791,164 @@ PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_const_structp png_ptr)); * default flush function, which uses the standard *FILE structure, will * be used. */ -PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, - png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); +PNG_EXPORT(77, void, png_set_write_fn, (png_structrp png_ptr, png_voidp io_ptr, + png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); /* Replace the default data input function with a user supplied one. */ -PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, - png_voidp io_ptr, png_rw_ptr read_data_fn)); +PNG_EXPORT(78, void, png_set_read_fn, (png_structrp png_ptr, png_voidp io_ptr, + png_rw_ptr read_data_fn)); /* Return the user pointer associated with the I/O functions */ -PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); +PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_const_structrp png_ptr)); -PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, - png_read_status_ptr read_row_fn)); +PNG_EXPORT(80, void, png_set_read_status_fn, (png_structrp png_ptr, + png_read_status_ptr read_row_fn)); -PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, - png_write_status_ptr write_row_fn)); +PNG_EXPORT(81, void, png_set_write_status_fn, (png_structrp png_ptr, + png_write_status_ptr write_row_fn)); #ifdef PNG_USER_MEM_SUPPORTED /* Replace the default memory allocation functions with user supplied one(s). */ -PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, - png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); +PNG_EXPORT(82, void, png_set_mem_fn, (png_structrp png_ptr, png_voidp mem_ptr, + png_malloc_ptr malloc_fn, png_free_ptr free_fn)); /* Return the user pointer associated with the memory functions */ -PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_const_structp png_ptr)); +PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structrp png_ptr)); #endif #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED -PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp - png_ptr, png_user_transform_ptr read_user_transform_fn)); +PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structrp png_ptr, + png_user_transform_ptr read_user_transform_fn)); #endif #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED -PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp - png_ptr, png_user_transform_ptr write_user_transform_fn)); +PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structrp png_ptr, + png_user_transform_ptr write_user_transform_fn)); #endif -#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ - defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) -PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp - png_ptr, png_voidp user_transform_ptr, int user_transform_depth, - int user_transform_channels)); +#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED +PNG_EXPORT(86, void, png_set_user_transform_info, (png_structrp png_ptr, + png_voidp user_transform_ptr, int user_transform_depth, + int user_transform_channels)); /* Return the user pointer associated with the user transform functions */ -PNG_EXPORT(png_voidp,png_get_user_transform_ptr) - PNGARG((png_const_structp png_ptr)); +PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr, + (png_const_structrp png_ptr)); +#endif + +#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED +/* Return information about the row currently being processed. Note that these + * APIs do not fail but will return unexpected results if called outside a user + * transform callback. Also note that when transforming an interlaced image the + * row number is the row number within the sub-image of the interlace pass, so + * the value will increase to the height of the sub-image (not the full image) + * then reset to 0 for the next pass. + * + * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to + * find the output pixel (x,y) given an interlaced sub-image pixel + * (row,col,pass). (See below for these macros.) + */ +PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structrp)); +PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structrp)); +#endif + +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED +/* This callback is called only for *unknown* chunks. If + * PNG_HANDLE_AS_UNKNOWN_SUPPORTED is set then it is possible to set known + * chunks to be treated as unknown, however in this case the callback must do + * any processing required by the chunk (e.g. by calling the appropriate + * png_set_ APIs.) + * + * There is no write support - on write, by default, all the chunks in the + * 'unknown' list are written in the specified position. + * + * The integer return from the callback function is interpreted thus: + * + * negative: An error occured, png_chunk_error will be called. + * zero: The chunk was not handled, the chunk will be saved. A critical + * chunk will cause an error at this point unless it is to be saved. + * positive: The chunk was handled, libpng will ignore/discard it. + * + * See "INTERACTION WTIH USER CHUNK CALLBACKS" below for important notes about + * how this behavior will change in libpng 1.7 + */ +PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structrp png_ptr, + png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); #endif #ifdef PNG_USER_CHUNKS_SUPPORTED -PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, - png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); -PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_const_structp - png_ptr)); +PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structrp png_ptr)); #endif #ifdef PNG_PROGRESSIVE_READ_SUPPORTED /* Sets the function callbacks for the push reader, and a pointer to a * user-defined structure available to the callback functions. */ -PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, - png_voidp progressive_ptr, - png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, - png_progressive_end_ptr end_fn)); +PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structrp png_ptr, + png_voidp progressive_ptr, png_progressive_info_ptr info_fn, + png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn)); /* Returns the user pointer associated with the push read functions */ -PNG_EXPORT(png_voidp,png_get_progressive_ptr) - PNGARG((png_const_structp png_ptr)); +PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, + (png_const_structrp png_ptr)); /* Function to be called when data becomes available */ -PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); +PNG_EXPORT(92, void, png_process_data, (png_structrp png_ptr, + png_inforp info_ptr, png_bytep buffer, png_size_t buffer_size)); -/* Function that combines rows. Not very much different than the - * png_combine_row() call. Is this even used????? +/* A function which may be called *only* within png_process_data to stop the + * processing of any more data. The function returns the number of bytes + * remaining, excluding any that libpng has cached internally. A subsequent + * call to png_process_data must supply these bytes again. If the argument + * 'save' is set to true the routine will first save all the pending data and + * will always return 0. */ -PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, - png_bytep old_row, png_bytep new_row)); +PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structrp, int save)); + +/* A function which may be called *only* outside (after) a call to + * png_process_data. It returns the number of bytes of data to skip in the + * input. Normally it will return 0, but if it returns a non-zero value the + * application must skip than number of bytes of input data and pass the + * following data to the next call to png_process_data. + */ +PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structrp)); + +#ifdef PNG_READ_INTERLACING_SUPPORTED +/* Function that combines rows. 'new_row' is a flag that should come from + * the callback and be non-NULL if anything needs to be done; the library + * stores its own version of the new data internally and ignores the passed + * in value. + */ +PNG_EXPORT(93, void, png_progressive_combine_row, (png_const_structrp png_ptr, + png_bytep old_row, png_const_bytep new_row)); +#endif /* PNG_READ_INTERLACING_SUPPORTED */ #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ -PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, - png_alloc_size_t size)) PNG_ALLOCATED; +PNG_EXPORTA(94, png_voidp, png_malloc, (png_const_structrp png_ptr, + png_alloc_size_t size), PNG_ALLOCATED); /* Added at libpng version 1.4.0 */ -PNG_EXPORT(png_voidp,png_calloc) PNGARG((png_structp png_ptr, - png_alloc_size_t size)) PNG_ALLOCATED; +PNG_EXPORTA(95, png_voidp, png_calloc, (png_const_structrp png_ptr, + png_alloc_size_t size), PNG_ALLOCATED); /* Added at libpng version 1.2.4 */ -PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, - png_alloc_size_t size)) PNG_ALLOCATED; +PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_const_structrp png_ptr, + png_alloc_size_t size), PNG_ALLOCATED); /* Frees a pointer allocated by png_malloc() */ -PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); +PNG_EXPORT(97, void, png_free, (png_const_structrp png_ptr, png_voidp ptr)); /* Free data that was allocated internally */ -PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_uint_32 free_me, int num)); +PNG_EXPORT(98, void, png_free_data, (png_const_structrp png_ptr, + png_inforp info_ptr, png_uint_32 free_me, int num)); + /* Reassign responsibility for freeing existing data, whether allocated - * by libpng or by the application */ -PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, - png_infop info_ptr, int freer, png_uint_32 mask)); + * by libpng or by the application; this works on the png_info structure passed + * in, it does not change the state for other png_info structures. + * + * It is unlikely that this function works correctly as of 1.6.0 and using it + * may result either in memory leaks or double free of allocated data. + */ +PNG_EXPORTA(99, void, png_data_freer, (png_const_structrp png_ptr, + png_inforp info_ptr, int freer, png_uint_32 mask), PNG_DEPRECATED); + /* Assignments for png_data_freer */ #define PNG_DESTROY_WILL_FREE_DATA 1 #define PNG_SET_WILL_FREE_DATA 1 @@ -2091,8 +1960,10 @@ PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, #define PNG_FREE_ROWS 0x0040 #define PNG_FREE_PCAL 0x0080 #define PNG_FREE_SCAL 0x0100 -#define PNG_FREE_UNKN 0x0200 -#define PNG_FREE_LIST 0x0400 +#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED +# define PNG_FREE_UNKN 0x0200 +#endif +/* PNG_FREE_LIST 0x0400 removed in 1.6.0 because it is ignored */ #define PNG_FREE_PLTE 0x1000 #define PNG_FREE_TRNS 0x2000 #define PNG_FREE_TEXT 0x4000 @@ -2100,46 +1971,58 @@ PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ #ifdef PNG_USER_MEM_SUPPORTED -PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, - png_alloc_size_t size)) PNG_ALLOCATED; -PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, - png_voidp ptr)); +PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_const_structrp png_ptr, + png_alloc_size_t size), PNG_ALLOCATED PNG_DEPRECATED); +PNG_EXPORTA(101, void, png_free_default, (png_const_structrp png_ptr, + png_voidp ptr), PNG_DEPRECATED); #endif -#ifndef PNG_NO_ERROR_TEXT +#ifdef PNG_ERROR_TEXT_SUPPORTED /* Fatal error in PNG image of libpng - can't continue */ -PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, - png_const_charp error_message)) PNG_NORETURN; +PNG_EXPORTA(102, void, png_error, (png_const_structrp png_ptr, + png_const_charp error_message), PNG_NORETURN); /* The same, but the chunk name is prepended to the error string. */ -PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, - png_const_charp error_message)) PNG_NORETURN; +PNG_EXPORTA(103, void, png_chunk_error, (png_const_structrp png_ptr, + png_const_charp error_message), PNG_NORETURN); #else /* Fatal error in PNG image of libpng - can't continue */ -PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN; +PNG_EXPORTA(104, void, png_err, (png_const_structrp png_ptr), PNG_NORETURN); #endif +#ifdef PNG_WARNINGS_SUPPORTED /* Non-fatal error in libpng. Can continue, but may have a problem. */ -PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, - png_const_charp warning_message)); +PNG_EXPORT(105, void, png_warning, (png_const_structrp png_ptr, + png_const_charp warning_message)); /* Non-fatal error in libpng, chunk name is prepended to message. */ -PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, - png_const_charp warning_message)); +PNG_EXPORT(106, void, png_chunk_warning, (png_const_structrp png_ptr, + png_const_charp warning_message)); +#endif #ifdef PNG_BENIGN_ERRORS_SUPPORTED /* Benign error in libpng. Can continue, but may have a problem. * User can choose whether to handle as a fatal error or as a warning. */ -PNG_EXPORT(void,png_benign_error) PNGARG((png_structp png_ptr, - png_const_charp warning_message)); +PNG_EXPORT(107, void, png_benign_error, (png_const_structrp png_ptr, + png_const_charp warning_message)); -/* Same, chunk name is prepended to message. */ -PNG_EXPORT(void,png_chunk_benign_error) PNGARG((png_structp png_ptr, - png_const_charp warning_message)); +#ifdef PNG_READ_SUPPORTED +/* Same, chunk name is prepended to message (only during read) */ +PNG_EXPORT(108, void, png_chunk_benign_error, (png_const_structrp png_ptr, + png_const_charp warning_message)); +#endif -PNG_EXPORT(void,png_set_benign_errors) PNGARG((png_structp - png_ptr, int allowed)); +PNG_EXPORT(109, void, png_set_benign_errors, + (png_structrp png_ptr, int allowed)); +#else +# ifdef PNG_ALLOW_BENIGN_ERRORS +# define png_benign_error png_warning +# define png_chunk_benign_error png_chunk_warning +# else +# define png_benign_error png_error +# define png_chunk_benign_error png_chunk_error +# endif #endif /* The png_set_ functions are for storing values in the png_info_struct. @@ -2155,258 +2038,274 @@ PNG_EXPORT(void,png_set_benign_errors) PNGARG((png_structp * png_info_struct. */ /* Returns "flag" if chunk data is valid in info_ptr. */ -PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, png_uint_32 flag)); +PNG_EXPORT(110, png_uint_32, png_get_valid, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_uint_32 flag)); /* Returns number of bytes needed to hold a transformed row. */ -PNG_EXPORT(png_size_t,png_get_rowbytes) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr)); +PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); #ifdef PNG_INFO_IMAGE_SUPPORTED /* Returns row_pointers, which is an array of pointers to scanlines that was * returned from png_read_png(). */ -PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr)); +PNG_EXPORT(112, png_bytepp, png_get_rows, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); + /* Set row_pointers, which is an array of pointers to scanlines for use * by png_write_png(). */ -PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_bytepp row_pointers)); +PNG_EXPORT(113, void, png_set_rows, (png_const_structrp png_ptr, + png_inforp info_ptr, png_bytepp row_pointers)); #endif /* Returns number of color channels in image. */ -PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr)); +PNG_EXPORT(114, png_byte, png_get_channels, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); #ifdef PNG_EASY_ACCESS_SUPPORTED /* Returns image width in pixels. */ -PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); /* Returns image height in pixels. */ -PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); /* Returns image bit_depth. */ -PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(117, png_byte, png_get_bit_depth, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); /* Returns image color_type. */ -PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); /* Returns image filter_type. */ -PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); /* Returns image interlace_type. */ -PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); /* Returns image compression_type. */ -PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); /* Returns image resolution in pixels per meter, from pHYs chunk data. */ -PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); -PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); -PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter, + (png_const_structrp png_ptr, png_const_inforp info_ptr)); +PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter, + (png_const_structrp png_ptr, png_const_inforp info_ptr)); +PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter, + (png_const_structrp png_ptr, png_const_inforp info_ptr)); /* Returns pixel aspect ratio, computed from pHYs chunk data. */ -#ifdef PNG_FLOATING_POINT_SUPPORTED -PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); -#endif +PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio, + (png_const_structrp png_ptr, png_const_inforp info_ptr)) +PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed, + (png_const_structrp png_ptr, png_const_inforp info_ptr)) /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ -PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); -PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); -PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); -PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels, + (png_const_structrp png_ptr, png_const_inforp info_ptr)); +PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels, + (png_const_structrp png_ptr, png_const_inforp info_ptr)); +PNG_EXPORT(128, png_int_32, png_get_x_offset_microns, + (png_const_structrp png_ptr, png_const_inforp info_ptr)); +PNG_EXPORT(129, png_int_32, png_get_y_offset_microns, + (png_const_structrp png_ptr, png_const_inforp info_ptr)); #endif /* PNG_EASY_ACCESS_SUPPORTED */ +#ifdef PNG_READ_SUPPORTED /* Returns pointer to signature string read from PNG header */ -PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_const_structp png_ptr, - png_infop info_ptr)); - -#ifdef PNG_bKGD_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_const_structp png_ptr, - png_infop info_ptr, png_color_16p *background)); +PNG_EXPORT(130, png_const_bytep, png_get_signature, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); #endif #ifdef PNG_bKGD_SUPPORTED -PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_color_16p background)); +PNG_EXPORT(131, png_uint_32, png_get_bKGD, (png_const_structrp png_ptr, + png_inforp info_ptr, png_color_16p *background)); +#endif + +#ifdef PNG_bKGD_SUPPORTED +PNG_EXPORT(132, void, png_set_bKGD, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_color_16p background)); #endif #ifdef PNG_cHRM_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, double *white_x, double *white_y, double *red_x, - double *red_y, double *green_x, double *green_y, double *blue_x, - double *blue_y)); -#endif -#ifdef PNG_FIXED_POINT_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point - *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, - png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point - *int_blue_x, png_fixed_point *int_blue_y)); -#endif +PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structrp png_ptr, + png_const_inforp info_ptr, double *white_x, double *white_y, double *red_x, + double *red_y, double *green_x, double *green_y, double *blue_x, + double *blue_y)) +PNG_FP_EXPORT(230, png_uint_32, png_get_cHRM_XYZ, (png_const_structrp png_ptr, + png_const_inforp info_ptr, double *red_X, double *red_Y, double *red_Z, + double *green_X, double *green_Y, double *green_Z, double *blue_X, + double *blue_Y, double *blue_Z)) +PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed, + (png_const_structrp png_ptr, png_const_inforp info_ptr, + png_fixed_point *int_white_x, png_fixed_point *int_white_y, + png_fixed_point *int_red_x, png_fixed_point *int_red_y, + png_fixed_point *int_green_x, png_fixed_point *int_green_y, + png_fixed_point *int_blue_x, png_fixed_point *int_blue_y)) +PNG_FIXED_EXPORT(231, png_uint_32, png_get_cHRM_XYZ_fixed, + (png_const_structrp png_ptr, png_const_inforp info_ptr, + png_fixed_point *int_red_X, png_fixed_point *int_red_Y, + png_fixed_point *int_red_Z, png_fixed_point *int_green_X, + png_fixed_point *int_green_Y, png_fixed_point *int_green_Z, + png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y, + png_fixed_point *int_blue_Z)) #endif #ifdef PNG_cHRM_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED -PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, - png_infop info_ptr, double white_x, double white_y, double red_x, - double red_y, double green_x, double green_y, double blue_x, double blue_y)); -#endif -#ifdef PNG_FIXED_POINT_SUPPORTED -PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, - png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point - int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, - png_fixed_point int_blue_y)); -#endif +PNG_FP_EXPORT(135, void, png_set_cHRM, (png_const_structrp png_ptr, + png_inforp info_ptr, + double white_x, double white_y, double red_x, double red_y, double green_x, + double green_y, double blue_x, double blue_y)) +PNG_FP_EXPORT(232, void, png_set_cHRM_XYZ, (png_const_structrp png_ptr, + png_inforp info_ptr, double red_X, double red_Y, double red_Z, + double green_X, double green_Y, double green_Z, double blue_X, + double blue_Y, double blue_Z)) +PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_const_structrp png_ptr, + png_inforp info_ptr, png_fixed_point int_white_x, + png_fixed_point int_white_y, png_fixed_point int_red_x, + png_fixed_point int_red_y, png_fixed_point int_green_x, + png_fixed_point int_green_y, png_fixed_point int_blue_x, + png_fixed_point int_blue_y)) +PNG_FIXED_EXPORT(233, void, png_set_cHRM_XYZ_fixed, (png_const_structrp png_ptr, + png_inforp info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y, + png_fixed_point int_red_Z, png_fixed_point int_green_X, + png_fixed_point int_green_Y, png_fixed_point int_green_Z, + png_fixed_point int_blue_X, png_fixed_point int_blue_Y, + png_fixed_point int_blue_Z)) #endif #ifdef PNG_gAMA_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, double *file_gamma)); -#endif -PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, png_fixed_point *int_file_gamma)); +PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA, (png_const_structrp png_ptr, + png_const_inforp info_ptr, double *file_gamma)) +PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed, + (png_const_structrp png_ptr, png_const_inforp info_ptr, + png_fixed_point *int_file_gamma)) #endif #ifdef PNG_gAMA_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED -PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, - png_infop info_ptr, double file_gamma)); -#endif -PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_fixed_point int_file_gamma)); +PNG_FP_EXPORT(139, void, png_set_gAMA, (png_const_structrp png_ptr, + png_inforp info_ptr, double file_gamma)) +PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_const_structrp png_ptr, + png_inforp info_ptr, png_fixed_point int_file_gamma)) #endif #ifdef PNG_hIST_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, png_uint_16p *hist)); +PNG_EXPORT(141, png_uint_32, png_get_hIST, (png_const_structrp png_ptr, + png_inforp info_ptr, png_uint_16p *hist)); #endif #ifdef PNG_hIST_SUPPORTED -PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_uint_16p hist)); +PNG_EXPORT(142, void, png_set_hIST, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_uint_16p hist)); #endif -PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, - int *bit_depth, int *color_type, int *interlace_method, - int *compression_method, int *filter_method)); +PNG_EXPORT(143, png_uint_32, png_get_IHDR, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_uint_32 *width, png_uint_32 *height, + int *bit_depth, int *color_type, int *interlace_method, + int *compression_method, int *filter_method)); -PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, - int color_type, int interlace_method, int compression_method, - int filter_method)); +PNG_EXPORT(144, void, png_set_IHDR, (png_const_structrp png_ptr, + png_inforp info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, + int color_type, int interlace_method, int compression_method, + int filter_method)); #ifdef PNG_oFFs_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, +PNG_EXPORT(145, png_uint_32, png_get_oFFs, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)); #endif #ifdef PNG_oFFs_SUPPORTED -PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, - int unit_type)); +PNG_EXPORT(146, void, png_set_oFFs, (png_const_structrp png_ptr, + png_inforp info_ptr, png_int_32 offset_x, png_int_32 offset_y, + int unit_type)); #endif #ifdef PNG_pCAL_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, - int *type, int *nparams, png_charp *units, png_charpp *params)); +PNG_EXPORT(147, png_uint_32, png_get_pCAL, (png_const_structrp png_ptr, + png_inforp info_ptr, png_charp *purpose, png_int_32 *X0, + png_int_32 *X1, int *type, int *nparams, png_charp *units, + png_charpp *params)); #endif #ifdef PNG_pCAL_SUPPORTED -PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, - int type, int nparams, png_charp units, png_charpp params)); +PNG_EXPORT(148, void, png_set_pCAL, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_charp purpose, png_int_32 X0, png_int_32 X1, + int type, int nparams, png_const_charp units, png_charpp params)); #endif #ifdef PNG_pHYs_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); +PNG_EXPORT(149, png_uint_32, png_get_pHYs, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, + int *unit_type)); #endif #ifdef PNG_pHYs_SUPPORTED -PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); +PNG_EXPORT(150, void, png_set_pHYs, (png_const_structrp png_ptr, + png_inforp info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); #endif -PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, png_colorp *palette, int *num_palette)); +PNG_EXPORT(151, png_uint_32, png_get_PLTE, (png_const_structrp png_ptr, + png_inforp info_ptr, png_colorp *palette, int *num_palette)); -PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_colorp palette, int num_palette)); +PNG_EXPORT(152, void, png_set_PLTE, (png_structrp png_ptr, + png_inforp info_ptr, png_const_colorp palette, int num_palette)); #ifdef PNG_sBIT_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_const_structp png_ptr, - png_infop info_ptr, png_color_8p *sig_bit)); +PNG_EXPORT(153, png_uint_32, png_get_sBIT, (png_const_structrp png_ptr, + png_inforp info_ptr, png_color_8p *sig_bit)); #endif #ifdef PNG_sBIT_SUPPORTED -PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_color_8p sig_bit)); +PNG_EXPORT(154, void, png_set_sBIT, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_color_8p sig_bit)); #endif #ifdef PNG_sRGB_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, int *intent)); +PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structrp png_ptr, + png_const_inforp info_ptr, int *file_srgb_intent)); #endif #ifdef PNG_sRGB_SUPPORTED -PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, - png_infop info_ptr, int intent)); -PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, - png_infop info_ptr, int intent)); +PNG_EXPORT(156, void, png_set_sRGB, (png_const_structrp png_ptr, + png_inforp info_ptr, int srgb_intent)); +PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_const_structrp png_ptr, + png_inforp info_ptr, int srgb_intent)); #endif #ifdef PNG_iCCP_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, png_charpp name, int *compression_type, - png_charpp profile, png_uint_32 *proflen)); - /* Note to maintainer: profile should be png_bytepp */ +PNG_EXPORT(158, png_uint_32, png_get_iCCP, (png_const_structrp png_ptr, + png_inforp info_ptr, png_charpp name, int *compression_type, + png_bytepp profile, png_uint_32 *proflen)); #endif #ifdef PNG_iCCP_SUPPORTED -PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_charp name, int compression_type, - png_charp profile, png_uint_32 proflen)); - /* Note to maintainer: profile should be png_bytep */ +PNG_EXPORT(159, void, png_set_iCCP, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_charp name, int compression_type, + png_const_bytep profile, png_uint_32 proflen)); #endif #ifdef PNG_sPLT_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, png_sPLT_tpp entries)); +PNG_EXPORT(160, int, png_get_sPLT, (png_const_structrp png_ptr, + png_inforp info_ptr, png_sPLT_tpp entries)); #endif #ifdef PNG_sPLT_SUPPORTED -PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_sPLT_tp entries, int nentries)); +PNG_EXPORT(161, void, png_set_sPLT, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)); #endif #ifdef PNG_TEXT_SUPPORTED /* png_get_text also returns the number of text chunks in *num_text */ -PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, png_textp *text_ptr, int *num_text)); +PNG_EXPORT(162, int, png_get_text, (png_const_structrp png_ptr, + png_inforp info_ptr, png_textp *text_ptr, int *num_text)); #endif /* Note while png_set_text() will accept a structure whose text, @@ -2417,111 +2316,217 @@ PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_const_structp png_ptr, */ #ifdef PNG_TEXT_SUPPORTED -PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_textp text_ptr, int num_text)); +PNG_EXPORT(163, void, png_set_text, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_textp text_ptr, int num_text)); #endif #ifdef PNG_tIME_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_const_structp png_ptr, - png_infop info_ptr, png_timep *mod_time)); +PNG_EXPORT(164, png_uint_32, png_get_tIME, (png_const_structrp png_ptr, + png_inforp info_ptr, png_timep *mod_time)); #endif #ifdef PNG_tIME_SUPPORTED -PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_timep mod_time)); +PNG_EXPORT(165, void, png_set_tIME, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_timep mod_time)); #endif #ifdef PNG_tRNS_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_const_structp png_ptr, - png_infop info_ptr, png_bytep *trans_alpha, int *num_trans, - png_color_16p *trans_color)); -#endif - -#ifdef PNG_tRNS_SUPPORTED -PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_bytep trans_alpha, int num_trans, - png_color_16p trans_color)); +PNG_EXPORT(166, png_uint_32, png_get_tRNS, (png_const_structrp png_ptr, + png_inforp info_ptr, png_bytep *trans_alpha, int *num_trans, + png_color_16p *trans_color)); #endif #ifdef PNG_tRNS_SUPPORTED +PNG_EXPORT(167, void, png_set_tRNS, (png_structrp png_ptr, + png_inforp info_ptr, png_const_bytep trans_alpha, int num_trans, + png_const_color_16p trans_color)); #endif #ifdef PNG_sCAL_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, int *unit, double *width, double *height)); -#else -#ifdef PNG_FIXED_POINT_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); -#endif +PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL, (png_const_structrp png_ptr, + png_const_inforp info_ptr, int *unit, double *width, double *height)) +#if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \ + defined(PNG_FLOATING_POINT_SUPPORTED) +/* NOTE: this API is currently implemented using floating point arithmetic, + * consequently it can only be used on systems with floating point support. + * In any case the range of values supported by png_fixed_point is small and it + * is highly recommended that png_get_sCAL_s be used instead. + */ +PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed, + (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, + png_fixed_point *width, png_fixed_point *height)) #endif +PNG_EXPORT(169, png_uint_32, png_get_sCAL_s, + (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, + png_charpp swidth, png_charpp sheight)); + +PNG_FP_EXPORT(170, void, png_set_sCAL, (png_const_structrp png_ptr, + png_inforp info_ptr, int unit, double width, double height)) +PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_const_structrp png_ptr, + png_inforp info_ptr, int unit, png_fixed_point width, + png_fixed_point height)) +PNG_EXPORT(171, void, png_set_sCAL_s, (png_const_structrp png_ptr, + png_inforp info_ptr, int unit, + png_const_charp swidth, png_const_charp sheight)); #endif /* PNG_sCAL_SUPPORTED */ -#ifdef PNG_sCAL_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED -PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, - png_infop info_ptr, int unit, double width, double height)); -#else -#ifdef PNG_FIXED_POINT_SUPPORTED -PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, - png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); -#endif -#endif -#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ +#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED +/* Provide the default handling for all unknown chunks or, optionally, for + * specific unknown chunks. + * + * NOTE: prior to 1.6.0 the handling specified for particular chunks on read was + * ignored and the default was used, the per-chunk setting only had an effect on + * write. If you wish to have chunk-specific handling on read in code that must + * work on earlier versions you must use a user chunk callback to specify the + * desired handling (keep or discard.) + * + * The 'keep' parameter is a PNG_HANDLE_CHUNK_ value as listed below. The + * parameter is interpreted as follows: + * + * READ: + * PNG_HANDLE_CHUNK_AS_DEFAULT: + * Known chunks: do normal libpng processing, do not keep the chunk (but + * see the comments below about PNG_HANDLE_AS_UNKNOWN_SUPPORTED) + * Unknown chunks: for a specific chunk use the global default, when used + * as the default discard the chunk data. + * PNG_HANDLE_CHUNK_NEVER: + * Discard the chunk data. + * PNG_HANDLE_CHUNK_IF_SAFE: + * Keep the chunk data if the chunk is not critical else raise a chunk + * error. + * PNG_HANDLE_CHUNK_ALWAYS: + * Keep the chunk data. + * + * If the chunk data is saved it can be retrieved using png_get_unknown_chunks, + * below. Notice that specifying "AS_DEFAULT" as a global default is equivalent + * to specifying "NEVER", however when "AS_DEFAULT" is used for specific chunks + * it simply resets the behavior to the libpng default. + * + * INTERACTION WTIH USER CHUNK CALLBACKS: + * The per-chunk handling is always used when there is a png_user_chunk_ptr + * callback and the callback returns 0; the chunk is then always stored *unless* + * it is critical and the per-chunk setting is other than ALWAYS. Notice that + * the global default is *not* used in this case. (In effect the per-chunk + * value is incremented to at least IF_SAFE.) + * + * IMPORTANT NOTE: this behavior will change in libpng 1.7 - the global and + * per-chunk defaults will be honored. If you want to preserve the current + * behavior when your callback returns 0 you must set PNG_HANDLE_CHUNK_IF_SAFE + * as the default - if you don't do this libpng 1.6 will issue a warning. + * + * If you want unhandled unknown chunks to be discarded in libpng 1.6 and + * earlier simply return '1' (handled). + * + * PNG_HANDLE_AS_UNKNOWN_SUPPORTED: + * If this is *not* set known chunks will always be handled by libpng and + * will never be stored in the unknown chunk list. Known chunks listed to + * png_set_keep_unknown_chunks will have no effect. If it is set then known + * chunks listed with a keep other than AS_DEFAULT will *never* be processed + * by libpng, in addition critical chunks must either be processed by the + * callback or saved. + * + * The IHDR and IEND chunks must not be listed. Because this turns off the + * default handling for chunks that would otherwise be recognized the + * behavior of libpng transformations may well become incorrect! + * + * WRITE: + * When writing chunks the options only apply to the chunks specified by + * png_set_unknown_chunks (below), libpng will *always* write known chunks + * required by png_set_ calls and will always write the core critical chunks + * (as required for PLTE). + * + * Each chunk in the png_set_unknown_chunks list is looked up in the + * png_set_keep_unknown_chunks list to find the keep setting, this is then + * interpreted as follows: + * + * PNG_HANDLE_CHUNK_AS_DEFAULT: + * Write safe-to-copy chunks and write other chunks if the global + * default is set to _ALWAYS, otherwise don't write this chunk. + * PNG_HANDLE_CHUNK_NEVER: + * Do not write the chunk. + * PNG_HANDLE_CHUNK_IF_SAFE: + * Write the chunk if it is safe-to-copy, otherwise do not write it. + * PNG_HANDLE_CHUNK_ALWAYS: + * Write the chunk. + * + * Note that the default behavior is effectively the opposite of the read case - + * in read unknown chunks are not stored by default, in write they are written + * by default. Also the behavior of PNG_HANDLE_CHUNK_IF_SAFE is very different + * - on write the safe-to-copy bit is checked, on read the critical bit is + * checked and on read if the chunk is critical an error will be raised. + * + * num_chunks: + * =========== + * If num_chunks is positive, then the "keep" parameter specifies the manner + * for handling only those chunks appearing in the chunk_list array, + * otherwise the chunk list array is ignored. + * + * If num_chunks is 0 the "keep" parameter specifies the default behavior for + * unknown chunks, as described above. + * + * If num_chunks is negative, then the "keep" parameter specifies the manner + * for handling all unknown chunks plus all chunks recognized by libpng + * except for the IHDR, PLTE, tRNS, IDAT, and IEND chunks (which continue to + * be processed by libpng. + */ +PNG_EXPORT(172, void, png_set_keep_unknown_chunks, (png_structrp png_ptr, + int keep, png_const_bytep chunk_list, int num_chunks)); -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED -/* Provide a list of chunks and how they are to be handled, if the built-in - handling or default unknown chunk handling is not desired. Any chunks not - listed will be handled in the default manner. The IHDR and IEND chunks - must not be listed. - keep = 0: follow default behaviour - = 1: do not keep - = 2: keep only if safe-to-copy - = 3: keep even if unsafe-to-copy -*/ -PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp - png_ptr, int keep, png_bytep chunk_list, int num_chunks)); -PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep - chunk_name)); +/* The "keep" PNG_HANDLE_CHUNK_ parameter for the specified chunk is returned; + * the result is therefore true (non-zero) if special handling is required, + * false for the default handling. + */ +PNG_EXPORT(173, int, png_handle_as_unknown, (png_const_structrp png_ptr, + png_const_bytep chunk_name)); #endif -#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED -PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, - png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); -PNG_EXPORT(void, png_set_unknown_chunk_location) - PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); -PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_const_structp - png_ptr, png_const_infop info_ptr, png_unknown_chunkpp entries)); + +#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED +PNG_EXPORT(174, void, png_set_unknown_chunks, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_unknown_chunkp unknowns, + int num_unknowns)); + /* NOTE: prior to 1.6.0 this routine set the 'location' field of the added + * unknowns to the location currently stored in the png_struct. This is + * invariably the wrong value on write. To fix this call the following API + * for each chunk in the list with the correct location. If you know your + * code won't be compiled on earlier versions you can rely on + * png_set_unknown_chunks(write-ptr, png_get_unknown_chunks(read-ptr)) doing + * the correct thing. + */ + +PNG_EXPORT(175, void, png_set_unknown_chunk_location, + (png_const_structrp png_ptr, png_inforp info_ptr, int chunk, int location)); + +PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structrp png_ptr, + png_inforp info_ptr, png_unknown_chunkpp entries)); #endif /* Png_free_data() will turn off the "valid" flag for anything it frees. * If you need to turn it off for a chunk that your application has freed, * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */ -PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, - png_infop info_ptr, int mask)); +PNG_EXPORT(177, void, png_set_invalid, (png_const_structrp png_ptr, + png_inforp info_ptr, int mask)); #ifdef PNG_INFO_IMAGE_SUPPORTED /* The "params" pointer is currently not used and is for future expansion. */ -PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, - png_infop info_ptr, - int transforms, - png_voidp params)); -PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, - png_infop info_ptr, - int transforms, - png_voidp params)); +PNG_EXPORT(178, void, png_read_png, (png_structrp png_ptr, png_inforp info_ptr, + int transforms, png_voidp params)); +PNG_EXPORT(179, void, png_write_png, (png_structrp png_ptr, png_inforp info_ptr, + int transforms, png_voidp params)); #endif -PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_const_structp png_ptr)); -PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_const_structp png_ptr)); -PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_const_structp - png_ptr)); -PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_const_structp png_ptr)); +PNG_EXPORT(180, png_const_charp, png_get_copyright, + (png_const_structrp png_ptr)); +PNG_EXPORT(181, png_const_charp, png_get_header_ver, + (png_const_structrp png_ptr)); +PNG_EXPORT(182, png_const_charp, png_get_header_version, + (png_const_structrp png_ptr)); +PNG_EXPORT(183, png_const_charp, png_get_libpng_ver, + (png_const_structrp png_ptr)); #ifdef PNG_MNG_FEATURES_SUPPORTED -PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp - png_ptr, png_uint_32 mng_features_permitted)); +PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structrp png_ptr, + png_uint_32 mng_features_permitted)); #endif /* For use in png_set_keep_unknown, added to version 1.2.6 */ @@ -2529,80 +2534,151 @@ PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp #define PNG_HANDLE_CHUNK_NEVER 1 #define PNG_HANDLE_CHUNK_IF_SAFE 2 #define PNG_HANDLE_CHUNK_ALWAYS 3 +#define PNG_HANDLE_CHUNK_LAST 4 /* Strip the prepended error numbers ("#nnn ") from error and warning * messages before passing them to the error or warning handler. */ #ifdef PNG_ERROR_NUMBERS_SUPPORTED -PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp - png_ptr, png_uint_32 strip_mode)); +PNG_EXPORT(185, void, png_set_strip_error_numbers, (png_structrp png_ptr, + png_uint_32 strip_mode)); #endif /* Added in libpng-1.2.6 */ #ifdef PNG_SET_USER_LIMITS_SUPPORTED -PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp - png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); -PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_const_structp - png_ptr)); -PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_const_structp - png_ptr)); +PNG_EXPORT(186, void, png_set_user_limits, (png_structrp png_ptr, + png_uint_32 user_width_max, png_uint_32 user_height_max)); +PNG_EXPORT(187, png_uint_32, png_get_user_width_max, + (png_const_structrp png_ptr)); +PNG_EXPORT(188, png_uint_32, png_get_user_height_max, + (png_const_structrp png_ptr)); /* Added in libpng-1.4.0 */ -PNG_EXPORT(void,png_set_chunk_cache_max) PNGARG((png_structp - png_ptr, png_uint_32 user_chunk_cache_max)); -PNG_EXPORT(png_uint_32,png_get_chunk_cache_max) - PNGARG((png_const_structp png_ptr)); +PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structrp png_ptr, + png_uint_32 user_chunk_cache_max)); +PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max, + (png_const_structrp png_ptr)); /* Added in libpng-1.4.1 */ -PNG_EXPORT(void,png_set_chunk_malloc_max) PNGARG((png_structp - png_ptr, png_alloc_size_t user_chunk_cache_max)); -PNG_EXPORT(png_alloc_size_t,png_get_chunk_malloc_max) - PNGARG((png_const_structp png_ptr)); +PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structrp png_ptr, + png_alloc_size_t user_chunk_cache_max)); +PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max, + (png_const_structrp png_ptr)); #endif -#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) -PNG_EXPORT(png_uint_32,png_get_pixels_per_inch) - PNGARG((png_const_structp png_ptr, png_const_infop info_ptr)); +#if defined(PNG_INCH_CONVERSIONS_SUPPORTED) +PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch, + (png_const_structrp png_ptr, png_const_inforp info_ptr)); -PNG_EXPORT(png_uint_32,png_get_x_pixels_per_inch) - PNGARG((png_const_structp png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch, + (png_const_structrp png_ptr, png_const_inforp info_ptr)); -PNG_EXPORT(png_uint_32,png_get_y_pixels_per_inch) - PNGARG((png_const_structp png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch, + (png_const_structrp png_ptr, png_const_inforp info_ptr)); -PNG_EXPORT(float,png_get_x_offset_inches) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr)); +PNG_FP_EXPORT(196, float, png_get_x_offset_inches, + (png_const_structrp png_ptr, png_const_inforp info_ptr)) +#ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ +PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed, + (png_const_structrp png_ptr, png_const_inforp info_ptr)) +#endif -PNG_EXPORT(float,png_get_y_offset_inches) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr)); +PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structrp png_ptr, + png_const_inforp info_ptr)) +#ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ +PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed, + (png_const_structrp png_ptr, png_const_inforp info_ptr)) +#endif -#ifdef PNG_pHYs_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_pHYs_dpi) PNGARG((png_const_structp png_ptr, - png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, - int *unit_type)); -#endif /* PNG_pHYs_SUPPORTED */ -#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ +# ifdef PNG_pHYs_SUPPORTED +PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, + int *unit_type)); +# endif /* PNG_pHYs_SUPPORTED */ +#endif /* PNG_INCH_CONVERSIONS_SUPPORTED */ /* Added in libpng-1.4.0 */ #ifdef PNG_IO_STATE_SUPPORTED -PNG_EXPORT(png_uint_32,png_get_io_state) PNGARG((png_const_structp png_ptr)); +PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_const_structrp png_ptr)); -PNG_EXPORT(png_bytep,png_get_io_chunk_name) - PNGARG((png_structp png_ptr)); +/* Removed from libpng 1.6; use png_get_io_chunk_type. */ +PNG_REMOVED(200, png_const_bytep, png_get_io_chunk_name, (png_structrp png_ptr), + PNG_DEPRECATED) + +PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type, + (png_const_structrp png_ptr)); /* The flags returned by png_get_io_state() are the following: */ -#define PNG_IO_NONE 0x0000 /* no I/O at this moment */ -#define PNG_IO_READING 0x0001 /* currently reading */ -#define PNG_IO_WRITING 0x0002 /* currently writing */ -#define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */ -#define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */ -#define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */ -#define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */ -#define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */ -#define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */ +# define PNG_IO_NONE 0x0000 /* no I/O at this moment */ +# define PNG_IO_READING 0x0001 /* currently reading */ +# define PNG_IO_WRITING 0x0002 /* currently writing */ +# define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */ +# define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */ +# define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */ +# define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */ +# define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */ +# define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */ #endif /* ?PNG_IO_STATE_SUPPORTED */ -/* Maintainer: Put new public prototypes here ^, in libpng.3, and project - * defs +/* Interlace support. The following macros are always defined so that if + * libpng interlace handling is turned off the macros may be used to handle + * interlaced images within the application. */ +#define PNG_INTERLACE_ADAM7_PASSES 7 + +/* Two macros to return the first row and first column of the original, + * full, image which appears in a given pass. 'pass' is in the range 0 + * to 6 and the result is in the range 0 to 7. + */ +#define PNG_PASS_START_ROW(pass) (((1&~(pass))<<(3-((pass)>>1)))&7) +#define PNG_PASS_START_COL(pass) (((1& (pass))<<(3-(((pass)+1)>>1)))&7) + +/* A macro to return the offset between pixels in the output row for a pair of + * pixels in the input - effectively the inverse of the 'COL_SHIFT' macro that + * follows. Note that ROW_OFFSET is the offset from one row to the next whereas + * COL_OFFSET is from one column to the next, within a row. + */ +#define PNG_PASS_ROW_OFFSET(pass) ((pass)>2?(8>>(((pass)-1)>>1)):8) +#define PNG_PASS_COL_OFFSET(pass) (1<<((7-(pass))>>1)) + +/* Two macros to help evaluate the number of rows or columns in each + * pass. This is expressed as a shift - effectively log2 of the number or + * rows or columns in each 8x8 tile of the original image. + */ +#define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3) +#define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3) + +/* Hence two macros to determine the number of rows or columns in a given + * pass of an image given its height or width. In fact these macros may + * return non-zero even though the sub-image is empty, because the other + * dimension may be empty for a small image. + */ +#define PNG_PASS_ROWS(height, pass) (((height)+(((1<>PNG_PASS_ROW_SHIFT(pass)) +#define PNG_PASS_COLS(width, pass) (((width)+(((1<>PNG_PASS_COL_SHIFT(pass)) + +/* For the reader row callbacks (both progressive and sequential) it is + * necessary to find the row in the output image given a row in an interlaced + * image, so two more macros: + */ +#define PNG_ROW_FROM_PASS_ROW(y_in, pass) \ + (((y_in)<>(((7-(off))-(pass))<<2)) & 0xF) | \ + ((0x01145AF0>>(((7-(off))-(pass))<<2)) & 0xF0)) + +#define PNG_ROW_IN_INTERLACE_PASS(y, pass) \ + ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1) +#define PNG_COL_IN_INTERLACE_PASS(x, pass) \ + ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1) #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED /* With these routines we avoid an integer divide, which will be slower on @@ -2617,101 +2693,618 @@ PNG_EXPORT(png_bytep,png_get_io_chunk_name) * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] */ - /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ + /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ # define png_composite(composite, fg, alpha, bg) \ { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \ * (png_uint_16)(alpha) \ + (png_uint_16)(bg)*(png_uint_16)(255 \ - - (png_uint_16)(alpha)) + (png_uint_16)128); \ + - (png_uint_16)(alpha)) + 128); \ (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } # define png_composite_16(composite, fg, alpha, bg) \ { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \ * (png_uint_32)(alpha) \ - + (png_uint_32)(bg)*(png_uint_32)(65535L \ - - (png_uint_32)(alpha)) + (png_uint_32)32768L); \ + + (png_uint_32)(bg)*(65535 \ + - (png_uint_32)(alpha)) + 32768); \ (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } #else /* Standard method using integer division */ -# define png_composite(composite, fg, alpha, bg) \ - (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ - (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ - (png_uint_16)127) / 255) +# define png_composite(composite, fg, alpha, bg) \ + (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ + (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ + 127) / 255) # define png_composite_16(composite, fg, alpha, bg) \ (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ - (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ - (png_uint_32)32767) / (png_uint_32)65535L) + (png_uint_32)(bg)*(png_uint_32)(65535 - (png_uint_32)(alpha)) + \ + 32767) / 65535) #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ +#ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED +PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf)); +PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf)); +PNG_EXPORT(203, png_int_32, png_get_int_32, (png_const_bytep buf)); +#endif + +PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_const_structrp png_ptr, + png_const_bytep buf)); +/* No png_get_int_16 -- may be added if there's a real need for it. */ + +/* Place a 32-bit number into a buffer in PNG byte order (big-endian). */ +#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED +PNG_EXPORT(205, void, png_save_uint_32, (png_bytep buf, png_uint_32 i)); +#endif +#ifdef PNG_SAVE_INT_32_SUPPORTED +PNG_EXPORT(206, void, png_save_int_32, (png_bytep buf, png_int_32 i)); +#endif + +/* Place a 16-bit number into a buffer in PNG byte order. + * The parameter is declared unsigned int, not png_uint_16, + * just to avoid potential problems on pre-ANSI C compilers. + */ +#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED +PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i)); +/* No png_save_int_16 -- may be added if there's a real need for it. */ +#endif + #ifdef PNG_USE_READ_MACROS /* Inline macros to do direct reads of bytes from the input buffer. * The png_get_int_32() routine assumes we are using two's complement * format for negative values, which is almost certainly true. */ -# define png_get_uint_32(buf) \ +# define PNG_get_uint_32(buf) \ (((png_uint_32)(*(buf)) << 24) + \ ((png_uint_32)(*((buf) + 1)) << 16) + \ ((png_uint_32)(*((buf) + 2)) << 8) + \ ((png_uint_32)(*((buf) + 3)))) - /* The following definition introduces an API incompatibility (but not - * an ABI incompatibility) with libpng-1.4.0 through 1.4.4. Prior to - * libpng-1.4.5 the macro, which is used by default, returned (incorrectly) - * a (png_uint_32), while the function, if used instead, correctly returned - * a (png_uint_16). - * - * Libpng versions 1.0.x and 1.2.x only used a function so are not affected - * by this potential API incompatibility between macros. - */ -# define png_get_uint_16(buf) \ + /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the + * function) incorrectly returned a value of type png_uint_32. + */ +# define PNG_get_uint_16(buf) \ ((png_uint_16) \ - (((unsigned int)(*(buf)) << 8) + \ - ((unsigned int)(*((buf) + 1))))) + (((unsigned int)(*(buf)) << 8) + \ + ((unsigned int)(*((buf) + 1))))) -# define png_get_int_32(buf) \ +# define PNG_get_int_32(buf) \ ((png_int_32)((*(buf) & 0x80) \ ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \ : (png_int_32)png_get_uint_32(buf))) + + /* If PNG_PREFIX is defined the same thing as below happens in pnglibconf.h, + * but defining a macro name prefixed with PNG_PREFIX. + */ +# ifndef PNG_PREFIX +# define png_get_uint_32(buf) PNG_get_uint_32(buf) +# define png_get_uint_16(buf) PNG_get_uint_16(buf) +# define png_get_int_32(buf) PNG_get_int_32(buf) +# endif #else -PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); -PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); -#ifdef PNG_GET_INT_32_SUPPORTED -PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); +# ifdef PNG_PREFIX + /* No macros; revert to the (redefined) function */ +# define PNG_get_uint_32 (png_get_uint_32) +# define PNG_get_uint_16 (png_get_uint_16) +# define PNG_get_int_32 (png_get_int_32) +# endif #endif + +/******************************************************************************* + * SIMPLIFIED API + ******************************************************************************* + * + * Please read the documentation in libpng-manual.txt (TODO: write said + * documentation) if you don't understand what follows. + * + * The simplified API hides the details of both libpng and the PNG file format + * itself. It allows PNG files to be read into a very limited number of + * in-memory bitmap formats or to be written from the same formats. If these + * formats do not accomodate your needs then you can, and should, use the more + * sophisticated APIs above - these support a wide variety of in-memory formats + * and a wide variety of sophisticated transformations to those formats as well + * as a wide variety of APIs to manipulate ancillary information. + * + * To read a PNG file using the simplified API: + * + * 1) Declare a 'png_image' structure (see below) on the stack and set the + * version field to PNG_IMAGE_VERSION. + * 2) Call the appropriate png_image_begin_read... function. + * 3) Set the png_image 'format' member to the required sample format. + * 4) Allocate a buffer for the image and, if required, the color-map. + * 5) Call png_image_finish_read to read the image and, if required, the + * color-map into your buffers. + * + * There are no restrictions on the format of the PNG input itself; all valid + * color types, bit depths, and interlace methods are acceptable, and the + * input image is transformed as necessary to the requested in-memory format + * during the png_image_finish_read() step. The only caveat is that if you + * request a color-mapped image from a PNG that is full-color or makes + * complex use of an alpha channel the transformation is extremely lossy and the + * result may look terrible. + * + * To write a PNG file using the simplified API: + * + * 1) Declare a 'png_image' structure on the stack and memset() it to all zero. + * 2) Initialize the members of the structure that describe the image, setting + * the 'format' member to the format of the image samples. + * 3) Call the appropriate png_image_write... function with a pointer to the + * image and, if necessary, the color-map to write the PNG data. + * + * png_image is a structure that describes the in-memory format of an image + * when it is being read or defines the in-memory format of an image that you + * need to write: + */ +#define PNG_IMAGE_VERSION 1 + +typedef struct png_control *png_controlp; +typedef struct +{ + png_controlp opaque; /* Initialize to NULL, free with png_image_free */ + png_uint_32 version; /* Set to PNG_IMAGE_VERSION */ + png_uint_32 width; /* Image width in pixels (columns) */ + png_uint_32 height; /* Image height in pixels (rows) */ + png_uint_32 format; /* Image format as defined below */ + png_uint_32 flags; /* A bit mask containing informational flags */ + png_uint_32 colormap_entries; + /* Number of entries in the color-map */ + + /* In the event of an error or warning the following field will be set to a + * non-zero value and the 'message' field will contain a '\0' terminated + * string with the libpng error or warning message. If both warnings and + * an error were encountered, only the error is recorded. If there + * are multiple warnings, only the first one is recorded. + * + * The upper 30 bits of this value are reserved, the low two bits contain + * a value as follows: + */ +# define PNG_IMAGE_WARNING 1 +# define PNG_IMAGE_ERROR 2 + /* + * The result is a two bit code such that a value more than 1 indicates + * a failure in the API just called: + * + * 0 - no warning or error + * 1 - warning + * 2 - error + * 3 - error preceded by warning + */ +# define PNG_IMAGE_FAILED(png_cntrl) ((((png_cntrl).warning_or_error)&0x03)>1) + + png_uint_32 warning_or_error; + + char message[64]; +} png_image, *png_imagep; + +/* The samples of the image have one to four channels whose components have + * original values in the range 0 to 1.0: + * + * 1: A single gray or luminance channel (G). + * 2: A gray/luminance channel and an alpha channel (GA). + * 3: Three red, green, blue color channels (RGB). + * 4: Three color channels and an alpha channel (RGBA). + * + * The components are encoded in one of two ways: + * + * a) As a small integer, value 0..255, contained in a single byte. For the + * alpha channel the original value is simply value/255. For the color or + * luminance channels the value is encoded according to the sRGB specification + * and matches the 8-bit format expected by typical display devices. + * + * The color/gray channels are not scaled (pre-multiplied) by the alpha + * channel and are suitable for passing to color management software. + * + * b) As a value in the range 0..65535, contained in a 2-byte integer. All + * channels can be converted to the original value by dividing by 65535; all + * channels are linear. Color channels use the RGB encoding (RGB end-points) of + * the sRGB specification. This encoding is identified by the + * PNG_FORMAT_FLAG_LINEAR flag below. + * + * When the simplified API needs to convert between sRGB and linear colorspaces, + * the actual sRGB transfer curve defined in the sRGB specification (see the + * article at http://en.wikipedia.org/wiki/SRGB) is used, not the gamma=1/2.2 + * approximation used elsewhere in libpng. + * + * When an alpha channel is present it is expected to denote pixel coverage + * of the color or luminance channels and is returned as an associated alpha + * channel: the color/gray channels are scaled (pre-multiplied) by the alpha + * value. + * + * The samples are either contained directly in the image data, between 1 and 8 + * bytes per pixel according to the encoding, or are held in a color-map indexed + * by bytes in the image data. In the case of a color-map the color-map entries + * are individual samples, encoded as above, and the image data has one byte per + * pixel to select the relevant sample from the color-map. + */ + +/* PNG_FORMAT_* + * + * #defines to be used in png_image::format. Each #define identifies a + * particular layout of sample data and, if present, alpha values. There are + * separate defines for each of the two component encodings. + * + * A format is built up using single bit flag values. All combinations are + * valid. Formats can be built up from the flag values or you can use one of + * the predefined values below. When testing formats always use the FORMAT_FLAG + * macros to test for individual features - future versions of the library may + * add new flags. + * + * When reading or writing color-mapped images the format should be set to the + * format of the entries in the color-map then png_image_{read,write}_colormap + * called to read or write the color-map and set the format correctly for the + * image data. Do not set the PNG_FORMAT_FLAG_COLORMAP bit directly! + * + * NOTE: libpng can be built with particular features disabled, if you see + * compiler errors because the definition of one of the following flags has been + * compiled out it is because libpng does not have the required support. It is + * possible, however, for the libpng configuration to enable the format on just + * read or just write; in that case you may see an error at run time. You can + * guard against this by checking for the definition of the appropriate + * "_SUPPORTED" macro, one of: + * + * PNG_SIMPLIFIED_{READ,WRITE}_{BGR,AFIRST}_SUPPORTED + */ +#define PNG_FORMAT_FLAG_ALPHA 0x01U /* format with an alpha channel */ +#define PNG_FORMAT_FLAG_COLOR 0x02U /* color format: otherwise grayscale */ +#define PNG_FORMAT_FLAG_LINEAR 0x04U /* 2 byte channels else 1 byte */ +#define PNG_FORMAT_FLAG_COLORMAP 0x08U /* image data is color-mapped */ + +#ifdef PNG_FORMAT_BGR_SUPPORTED +# define PNG_FORMAT_FLAG_BGR 0x10U /* BGR colors, else order is RGB */ #endif -PNG_EXPORT(png_uint_32,png_get_uint_31) - PNGARG((png_structp png_ptr, png_bytep buf)); -/* No png_get_int_16 -- may be added if there's a real need for it. */ -/* Place a 32-bit number into a buffer in PNG byte order (big-endian). */ -PNG_EXPORT(void,png_save_uint_32) - PNGARG((png_bytep buf, png_uint_32 i)); -PNG_EXPORT(void,png_save_int_32) - PNGARG((png_bytep buf, png_int_32 i)); +#ifdef PNG_FORMAT_AFIRST_SUPPORTED +# define PNG_FORMAT_FLAG_AFIRST 0x20U /* alpha channel comes first */ +#endif -/* Place a 16-bit number into a buffer in PNG byte order. - * The parameter is declared unsigned int, not png_uint_16, - * just to avoid potential problems on pre-ANSI C compilers. +/* Commonly used formats have predefined macros. + * + * First the single byte (sRGB) formats: */ -PNG_EXPORT(void,png_save_uint_16) - PNGARG((png_bytep buf, unsigned int i)); -/* No png_save_int_16 -- may be added if there's a real need for it. */ +#define PNG_FORMAT_GRAY 0 +#define PNG_FORMAT_GA PNG_FORMAT_FLAG_ALPHA +#define PNG_FORMAT_AG (PNG_FORMAT_GA|PNG_FORMAT_FLAG_AFIRST) +#define PNG_FORMAT_RGB PNG_FORMAT_FLAG_COLOR +#define PNG_FORMAT_BGR (PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_BGR) +#define PNG_FORMAT_RGBA (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_ALPHA) +#define PNG_FORMAT_ARGB (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_AFIRST) +#define PNG_FORMAT_BGRA (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_ALPHA) +#define PNG_FORMAT_ABGR (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_AFIRST) -/* ************************************************************************* */ - -/* Various modes of operation. Note that after an init, mode is set to - * zero automatically when the structure is created. +/* Then the linear 2-byte formats. When naming these "Y" is used to + * indicate a luminance (gray) channel. */ -#define PNG_HAVE_IHDR 0x01 -#define PNG_HAVE_PLTE 0x02 -#define PNG_HAVE_IDAT 0x04 -#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ -#define PNG_HAVE_IEND 0x10 -#define PNG_HAVE_gAMA 0x20 -#define PNG_HAVE_cHRM 0x40 +#define PNG_FORMAT_LINEAR_Y PNG_FORMAT_FLAG_LINEAR +#define PNG_FORMAT_LINEAR_Y_ALPHA (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_ALPHA) +#define PNG_FORMAT_LINEAR_RGB (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR) +#define PNG_FORMAT_LINEAR_RGB_ALPHA \ + (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA) + +/* With color-mapped formats the image data is one byte for each pixel, the byte + * is an index into the color-map which is formatted as above. To obtain a + * color-mapped format it is sufficient just to add the PNG_FOMAT_FLAG_COLORMAP + * to one of the above definitions, or you can use one of the definitions below. + */ +#define PNG_FORMAT_RGB_COLORMAP (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_COLORMAP) +#define PNG_FORMAT_BGR_COLORMAP (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_COLORMAP) +#define PNG_FORMAT_RGBA_COLORMAP (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_COLORMAP) +#define PNG_FORMAT_ARGB_COLORMAP (PNG_FORMAT_ARGB|PNG_FORMAT_FLAG_COLORMAP) +#define PNG_FORMAT_BGRA_COLORMAP (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_COLORMAP) +#define PNG_FORMAT_ABGR_COLORMAP (PNG_FORMAT_ABGR|PNG_FORMAT_FLAG_COLORMAP) + +/* PNG_IMAGE macros + * + * These are convenience macros to derive information from a png_image + * structure. The PNG_IMAGE_SAMPLE_ macros return values appropriate to the + * actual image sample values - either the entries in the color-map or the + * pixels in the image. The PNG_IMAGE_PIXEL_ macros return corresponding values + * for the pixels and will always return 1 for color-mapped formats. The + * remaining macros return information about the rows in the image and the + * complete image. + * + * NOTE: All the macros that take a png_image::format parameter are compile time + * constants if the format parameter is, itself, a constant. Therefore these + * macros can be used in array declarations and case labels where required. + * Similarly the macros are also pre-processor constants (sizeof is not used) so + * they can be used in #if tests. + * + * First the information about the samples. + */ +#define PNG_IMAGE_SAMPLE_CHANNELS(fmt)\ + (((fmt)&(PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA))+1) + /* Return the total number of channels in a given format: 1..4 */ + +#define PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)\ + ((((fmt) & PNG_FORMAT_FLAG_LINEAR) >> 2)+1) + /* Return the size in bytes of a single component of a pixel or color-map + * entry (as appropriate) in the image: 1 or 2. + */ + +#define PNG_IMAGE_SAMPLE_SIZE(fmt)\ + (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)) + /* This is the size of the sample data for one sample. If the image is + * color-mapped it is the size of one color-map entry (and image pixels are + * one byte in size), otherwise it is the size of one image pixel. + */ + +#define PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(fmt)\ + (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * 256) + /* The maximum size of the color-map required by the format expressed in a + * count of components. This can be used to compile-time allocate a + * color-map: + * + * png_uint_16 colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(linear_fmt)]; + * + * png_byte colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(sRGB_fmt)]; + * + * Alternatively use the PNG_IMAGE_COLORMAP_SIZE macro below to use the + * information from one of the png_image_begin_read_ APIs and dynamically + * allocate the required memory. + */ + +/* Corresponding information about the pixels */ +#define PNG_IMAGE_PIXEL_(test,fmt)\ + (((fmt)&PNG_FORMAT_FLAG_COLORMAP)?1:test(fmt)) + +#define PNG_IMAGE_PIXEL_CHANNELS(fmt)\ + PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_CHANNELS,fmt) + /* The number of separate channels (components) in a pixel; 1 for a + * color-mapped image. + */ + +#define PNG_IMAGE_PIXEL_COMPONENT_SIZE(fmt)\ + PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_COMPONENT_SIZE,fmt) + /* The size, in bytes, of each component in a pixel; 1 for a color-mapped + * image. + */ + +#define PNG_IMAGE_PIXEL_SIZE(fmt) PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_SIZE,fmt) + /* The size, in bytes, of a complete pixel; 1 for a color-mapped image. */ + +/* Information about the whole row, or whole image */ +#define PNG_IMAGE_ROW_STRIDE(image)\ + (PNG_IMAGE_PIXEL_CHANNELS((image).format) * (image).width) + /* Return the total number of components in a single row of the image; this + * is the minimum 'row stride', the minimum count of components between each + * row. For a color-mapped image this is the minimum number of bytes in a + * row. + */ + +#define PNG_IMAGE_BUFFER_SIZE(image, row_stride)\ + (PNG_IMAGE_PIXEL_COMPONENT_SIZE((image).format)*(image).height*(row_stride)) + /* Return the size, in bytes, of an image buffer given a png_image and a row + * stride - the number of components to leave space for in each row. + */ + +#define PNG_IMAGE_SIZE(image)\ + PNG_IMAGE_BUFFER_SIZE(image, PNG_IMAGE_ROW_STRIDE(image)) + /* Return the size, in bytes, of the image in memory given just a png_image; + * the row stride is the minimum stride required for the image. + */ + +#define PNG_IMAGE_COLORMAP_SIZE(image)\ + (PNG_IMAGE_SAMPLE_SIZE((image).format) * (image).colormap_entries) + /* Return the size, in bytes, of the color-map of this image. If the image + * format is not a color-map format this will return a size sufficient for + * 256 entries in the given format; check PNG_FORMAT_FLAG_COLORMAP if + * you don't want to allocate a color-map in this case. + */ + +/* PNG_IMAGE_FLAG_* + * + * Flags containing additional information about the image are held in the + * 'flags' field of png_image. + */ +#define PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB 0x01 + /* This indicates the the RGB values of the in-memory bitmap do not + * correspond to the red, green and blue end-points defined by sRGB. + */ + +#define PNG_IMAGE_FLAG_FAST 0x02 + /* On write emphasise speed over compression; the resultant PNG file will be + * larger but will be produced significantly faster, particular for large + * images. Do not use this option for images which will be distributed, only + * used it when producing intermediate files that will be read back in + * repeatedly. For a typical 24-bit image the option will double the read + * speed at the cost of increasing the image size by 25%, however for many + * more compressible images the PNG file can be 10 times larger with only a + * slight speed gain. + */ + +#define PNG_IMAGE_FLAG_16BIT_sRGB 0x04 + /* On read if the image is a 16-bit per component image and there is no gAMA + * or sRGB chunk assume that the components are sRGB encoded. Notice that + * images output by the simplified API always have gamma information; setting + * this flag only affects the interpretation of 16-bit images from an + * external source. It is recommended that the application expose this flag + * to the user; the user can normally easily recognize the difference between + * linear and sRGB encoding. This flag has no effect on write - the data + * passed to the write APIs must have the correct encoding (as defined + * above.) + * + * If the flag is not set (the default) input 16-bit per component data is + * assumed to be linear. + * + * NOTE: the flag can only be set after the png_image_begin_read_ call, + * because that call initializes the 'flags' field. + */ + +#ifdef PNG_SIMPLIFIED_READ_SUPPORTED +/* READ APIs + * --------- + * + * The png_image passed to the read APIs must have been initialized by setting + * the png_controlp field 'opaque' to NULL (or, safer, memset the whole thing.) + */ +#ifdef PNG_STDIO_SUPPORTED +PNG_EXPORT(234, int, png_image_begin_read_from_file, (png_imagep image, + const char *file_name)); + /* The named file is opened for read and the image header is filled in + * from the PNG header in the file. + */ + +PNG_EXPORT(235, int, png_image_begin_read_from_stdio, (png_imagep image, + FILE* file)); + /* The PNG header is read from the stdio FILE object. */ +#endif /* PNG_STDIO_SUPPORTED */ + +PNG_EXPORT(236, int, png_image_begin_read_from_memory, (png_imagep image, + png_const_voidp memory, png_size_t size)); + /* The PNG header is read from the given memory buffer. */ + +PNG_EXPORT(237, int, png_image_finish_read, (png_imagep image, + png_const_colorp background, void *buffer, png_int_32 row_stride, + void *colormap)); + /* Finish reading the image into the supplied buffer and clean up the + * png_image structure. + * + * row_stride is the step, in byte or 2-byte units as appropriate, + * between adjacent rows. A positive stride indicates that the top-most row + * is first in the buffer - the normal top-down arrangement. A negative + * stride indicates that the bottom-most row is first in the buffer. + * + * background need only be supplied if an alpha channel must be removed from + * a png_byte format and the removal is to be done by compositing on a solid + * color; otherwise it may be NULL and any composition will be done directly + * onto the buffer. The value is an sRGB color to use for the background, + * for grayscale output the green channel is used. + * + * background must be supplied when an alpha channel must be removed from a + * single byte color-mapped output format, in other words if: + * + * 1) The original format from png_image_begin_read_from_* had + * PNG_FORMAT_FLAG_ALPHA set. + * 2) The format set by the application does not. + * 3) The format set by the application has PNG_FORMAT_FLAG_COLORMAP set and + * PNG_FORMAT_FLAG_LINEAR *not* set. + * + * For linear output removing the alpha channel is always done by compositing + * on black and background is ignored. + * + * colormap must be supplied when PNG_FORMAT_FLAG_COLORMAP is set. It must + * be at least the size (in bytes) returned by PNG_IMAGE_COLORMAP_SIZE. + * image->colormap_entries will be updated to the actual number of entries + * written to the colormap; this may be less than the original value. + */ + +PNG_EXPORT(238, void, png_image_free, (png_imagep image)); + /* Free any data allocated by libpng in image->opaque, setting the pointer to + * NULL. May be called at any time after the structure is initialized. + */ +#endif /* PNG_SIMPLIFIED_READ_SUPPORTED */ + +#ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED +#ifdef PNG_STDIO_SUPPORTED +/* WRITE APIS + * ---------- + * For write you must initialize a png_image structure to describe the image to + * be written. To do this use memset to set the whole structure to 0 then + * initialize fields describing your image. + * + * version: must be set to PNG_IMAGE_VERSION + * opaque: must be initialized to NULL + * width: image width in pixels + * height: image height in rows + * format: the format of the data (image and color-map) you wish to write + * flags: set to 0 unless one of the defined flags applies; set + * PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB for color format images where the RGB + * values do not correspond to the colors in sRGB. + * colormap_entries: set to the number of entries in the color-map (0 to 256) + */ +PNG_EXPORT(239, int, png_image_write_to_file, (png_imagep image, + const char *file, int convert_to_8bit, const void *buffer, + png_int_32 row_stride, const void *colormap)); + /* Write the image to the named file. */ + +PNG_EXPORT(240, int, png_image_write_to_stdio, (png_imagep image, FILE *file, + int convert_to_8_bit, const void *buffer, png_int_32 row_stride, + const void *colormap)); + /* Write the image to the given (FILE*). */ + +/* With both write APIs if image is in one of the linear formats with 16-bit + * data then setting convert_to_8_bit will cause the output to be an 8-bit PNG + * gamma encoded according to the sRGB specification, otherwise a 16-bit linear + * encoded PNG file is written. + * + * With color-mapped data formats the colormap parameter point to a color-map + * with at least image->colormap_entries encoded in the specified format. If + * the format is linear the written PNG color-map will be converted to sRGB + * regardless of the convert_to_8_bit flag. + * + * With all APIs row_stride is handled as in the read APIs - it is the spacing + * from one row to the next in component sized units (1 or 2 bytes) and if + * negative indicates a bottom-up row layout in the buffer. + * + * Note that the write API does not support interlacing or sub-8-bit pixels. + */ +#endif /* PNG_STDIO_SUPPORTED */ +#endif /* PNG_SIMPLIFIED_WRITE_SUPPORTED */ +/******************************************************************************* + * END OF SIMPLIFIED API + ******************************************************************************/ + +#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED +PNG_EXPORT(242, void, png_set_check_for_invalid_index, + (png_structrp png_ptr, int allowed)); +# ifdef PNG_GET_PALETTE_MAX_SUPPORTED +PNG_EXPORT(243, int, png_get_palette_max, (png_const_structp png_ptr, + png_const_infop info_ptr)); +# endif +#endif /* CHECK_FOR_INVALID_INDEX */ + +/******************************************************************************* + * IMPLEMENTATION OPTIONS + ******************************************************************************* + * + * Support for arbitrary implementation-specific optimizations. The API allows + * particular options to be turned on or off. 'Option' is the number of the + * option and 'onoff' is 0 (off) or non-0 (on). The value returned is given + * by the PNG_OPTION_ defines below. + * + * HARDWARE: normally hardware capabilites, such as the Intel SSE instructions, + * are detected at run time, however sometimes it may be impossible + * to do this in user mode, in which case it is necessary to discover + * the capabilities in an OS specific way. Such capabilities are + * listed here when libpng has support for them and must be turned + * ON by the application if present. + * + * SOFTWARE: sometimes software optimizations actually result in performance + * decrease on some architectures or systems, or with some sets of + * PNG images. 'Software' options allow such optimizations to be + * selected at run time. + */ +#ifdef PNG_SET_OPTION_SUPPORTED +#ifdef PNG_ARM_NEON_API_SUPPORTED +# define PNG_ARM_NEON 0 /* HARDWARE: ARM Neon SIMD instructions supported */ +#endif +#define PNG_MAXIMUM_INFLATE_WINDOW 2 /* SOFTWARE: force maximum window */ +#define PNG_OPTION_NEXT 4 /* Next option - numbers must be even */ + +/* Return values: NOTE: there are four values and 'off' is *not* zero */ +#define PNG_OPTION_UNSET 0 /* Unset - defaults to off */ +#define PNG_OPTION_INVALID 1 /* Option number out of range */ +#define PNG_OPTION_OFF 2 +#define PNG_OPTION_ON 3 + +PNG_EXPORT(244, int, png_set_option, (png_structrp png_ptr, int option, + int onoff)); +#endif + +/******************************************************************************* + * END OF HARDWARE OPTIONS + ******************************************************************************/ + +/* Maintainer: Put new public prototypes here ^, in libpng.3, and project + * defs, scripts/pnglibconf.h, and scripts/pnglibconf.h.prebuilt + */ + +/* The last ordinal number (this is the *last* one already used; the next + * one to use is one more than this.) Maintainer, remember to add an entry to + * scripts/symbols.def as well. + */ +#ifdef PNG_EXPORT_LAST_ORDINAL + PNG_EXPORT_LAST_ORDINAL(244); +#endif #ifdef __cplusplus } diff --git a/project/jni/png/include/pngconf.h b/project/jni/png/include/pngconf.h index 2040ecad6..4bd807f27 100644 --- a/project/jni/png/include/pngconf.h +++ b/project/jni/png/include/pngconf.h @@ -1,9 +1,9 @@ /* pngconf.h - machine configurable file for libpng * - * libpng version 1.4.6beta06 - January 23, 2011 - * For conditions of distribution and use, see copyright notice in png.h - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * libpng version 1.6.6 - September 16, 2013 + * + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -22,1334 +22,324 @@ #ifndef PNGCONF_H #define PNGCONF_H -#ifndef PNG_NO_LIMITS_H -# include -#endif - -/* Added at libpng-1.2.9 */ - -/* config.h is created by and PNG_CONFIGURE_LIBPNG is set by the "configure" - * script. - */ -#ifdef PNG_CONFIGURE_LIBPNG -# ifdef HAVE_CONFIG_H -# include "config.h" +/* To do: Do all of this in scripts/pnglibconf.dfa */ +#ifdef PNG_SAFE_LIMITS_SUPPORTED +# ifdef PNG_USER_WIDTH_MAX +# undef PNG_USER_WIDTH_MAX +# define PNG_USER_WIDTH_MAX 1000000L +# endif +# ifdef PNG_USER_HEIGHT_MAX +# undef PNG_USER_HEIGHT_MAX +# define PNG_USER_HEIGHT_MAX 1000000L +# endif +# ifdef PNG_USER_CHUNK_MALLOC_MAX +# undef PNG_USER_CHUNK_MALLOC_MAX +# define PNG_USER_CHUNK_MALLOC_MAX 4000000L +# endif +# ifdef PNG_USER_CHUNK_CACHE_MAX +# undef PNG_USER_CHUNK_CACHE_MAX +# define PNG_USER_CHUNK_CACHE_MAX 128 # endif #endif -/* - * Added at libpng-1.2.8 +#ifndef PNG_BUILDING_SYMBOL_TABLE /* else includes may cause problems */ + +/* From libpng 1.6.0 libpng requires an ANSI X3.159-1989 ("ISOC90") compliant C + * compiler for correct compilation. The following header files are required by + * the standard. If your compiler doesn't provide these header files, or they + * do not match the standard, you will need to provide/improve them. + */ +#include +#include + +/* Library header files. These header files are all defined by ISOC90; libpng + * expects conformant implementations, however, an ISOC90 conformant system need + * not provide these header files if the functionality cannot be implemented. + * In this case it will be necessary to disable the relevant parts of libpng in + * the build of pnglibconf.h. * - * PNG_USER_CONFIG has to be defined on the compiler command line. This - * includes the resource compiler for Windows DLL configurations. - */ -#ifdef PNG_USER_CONFIG -# include "pngusr.h" -# ifndef PNG_USER_PRIVATEBUILD -# define PNG_USER_PRIVATEBUILD -# endif -#endif - -/* - * If you create a private DLL you should define in "pngusr.h" the following: - * #define PNG_USER_PRIVATEBUILD - * e.g. #define PNG_USER_PRIVATEBUILD "Build by MyCompany for xyz reasons." - * #define PNG_USER_DLLFNAME_POSTFIX - * e.g. // private DLL "libpng14gx.dll" - * #define PNG_USER_DLLFNAME_POSTFIX "gx" - * - * The following macros are also at your disposal if you want to complete the - * DLL VERSIONINFO structure. - * - PNG_USER_VERSIONINFO_COMMENTS - * - PNG_USER_VERSIONINFO_COMPANYNAME - * - PNG_USER_VERSIONINFO_LEGALTRADEMARKS + * Prior to 1.6.0 string.h was included here; the API changes in 1.6.0 to not + * include this unnecessary header file. */ -#ifdef __STDC__ -# ifdef SPECIALBUILD -# pragma message("PNG_LIBPNG_SPECIALBUILD (and deprecated SPECIALBUILD)\ - are now LIBPNG reserved macros. Use PNG_USER_PRIVATEBUILD instead.") -# endif - -# ifdef PRIVATEBUILD -# pragma message("PRIVATEBUILD is deprecated.\ - Use PNG_USER_PRIVATEBUILD instead.") -# define PNG_USER_PRIVATEBUILD PRIVATEBUILD -# endif -#endif /* __STDC__ */ - -/* End of material added to libpng-1.2.8 */ - -#ifndef PNG_VERSION_INFO_ONLY - -/* This is the size of the compression buffer, and thus the size of - * an IDAT chunk. Make this whatever size you feel is best for your - * machine. One of these will be allocated per png_struct. When this - * is full, it writes the data to the disk, and does some other - * calculations. Making this an extremely small size will slow - * the library down, but you may want to experiment to determine - * where it becomes significant, if you are concerned with memory - * usage. Note that zlib allocates at least 32Kb also. For readers, - * this describes the size of the buffer available to read the data in. - * Unless this gets smaller than the size of a row (compressed), - * it should not make much difference how big this is. - */ - -#ifndef PNG_ZBUF_SIZE -# define PNG_ZBUF_SIZE 8192 -#endif - -/* Enable if you want a write-only libpng */ - -#ifndef PNG_NO_READ_SUPPORTED -# define PNG_READ_SUPPORTED -#endif - -/* Enable if you want a read-only libpng */ - -#ifndef PNG_NO_WRITE_SUPPORTED -# define PNG_WRITE_SUPPORTED -#endif - -/* Enabled in 1.4.0. */ -#ifdef PNG_ALLOW_BENIGN_ERRORS -# define png_benign_error png_warning -# define png_chunk_benign_error png_chunk_warning -#else -# ifndef PNG_BENIGN_ERRORS_SUPPORTED -# define png_benign_error png_error -# define png_chunk_benign_error png_chunk_error -# endif -#endif - -/* Added at libpng version 1.4.0 */ -#if !defined(PNG_NO_WARNINGS) && !defined(PNG_WARNINGS_SUPPORTED) -# define PNG_WARNINGS_SUPPORTED -#endif - -/* Added at libpng version 1.4.0 */ -#if !defined(PNG_NO_ERROR_TEXT) && !defined(PNG_ERROR_TEXT_SUPPORTED) -# define PNG_ERROR_TEXT_SUPPORTED -#endif - -/* Added at libpng version 1.4.0 */ -#if !defined(PNG_NO_CHECK_cHRM) && !defined(PNG_CHECK_cHRM_SUPPORTED) -# define PNG_CHECK_cHRM_SUPPORTED -#endif - -/* Added at libpng version 1.4.0 */ -#if !defined(PNG_NO_ALIGNED_MEMORY) && !defined(PNG_ALIGNED_MEMORY_SUPPORTED) -# define PNG_ALIGNED_MEMORY_SUPPORTED -#endif - -/* Enabled by default in 1.2.0. You can disable this if you don't need to - support PNGs that are embedded in MNG datastreams */ -#ifndef PNG_NO_MNG_FEATURES -# ifndef PNG_MNG_FEATURES_SUPPORTED -# define PNG_MNG_FEATURES_SUPPORTED -# endif -#endif - -/* Added at libpng version 1.4.0 */ -#ifndef PNG_NO_FLOATING_POINT_SUPPORTED -# ifndef PNG_FLOATING_POINT_SUPPORTED -# define PNG_FLOATING_POINT_SUPPORTED -# endif -#endif - -/* Added at libpng-1.4.0beta49 for testing (this test is no longer used - in libpng and png_calloc() is always present) - */ -#define PNG_CALLOC_SUPPORTED - -/* If you are running on a machine where you cannot allocate more - * than 64K of memory at once, uncomment this. While libpng will not - * normally need that much memory in a chunk (unless you load up a very - * large file), zlib needs to know how big of a chunk it can use, and - * libpng thus makes sure to check any memory allocation to verify it - * will fit into memory. -#define PNG_MAX_MALLOC_64K - */ -#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) -# define PNG_MAX_MALLOC_64K -#endif - -/* Special munging to support doing things the 'cygwin' way: - * 'Normal' png-on-win32 defines/defaults: - * PNG_BUILD_DLL -- building dll - * PNG_USE_DLL -- building an application, linking to dll - * (no define) -- building static library, or building an - * application and linking to the static lib - * 'Cygwin' defines/defaults: - * PNG_BUILD_DLL -- (ignored) building the dll - * (no define) -- (ignored) building an application, linking to the dll - * PNG_STATIC -- (ignored) building the static lib, or building an - * application that links to the static lib. - * ALL_STATIC -- (ignored) building various static libs, or building an - * application that links to the static libs. - * Thus, - * a cygwin user should define either PNG_BUILD_DLL or PNG_STATIC, and - * this bit of #ifdefs will define the 'correct' config variables based on - * that. If a cygwin user *wants* to define 'PNG_USE_DLL' that's okay, but - * unnecessary. - * - * Also, the precedence order is: - * ALL_STATIC (since we can't #undef something outside our namespace) - * PNG_BUILD_DLL - * PNG_STATIC - * (nothing) == PNG_USE_DLL - * - * CYGWIN (2002-01-20): The preceding is now obsolete. With the advent - * of auto-import in binutils, we no longer need to worry about - * __declspec(dllexport) / __declspec(dllimport) and friends. Therefore, - * we don't need to worry about PNG_STATIC or ALL_STATIC when it comes - * to __declspec() stuff. However, we DO need to worry about - * PNG_BUILD_DLL and PNG_STATIC because those change some defaults - * such as CONSOLE_IO. - */ -#ifdef __CYGWIN__ -# ifdef ALL_STATIC -# ifdef PNG_BUILD_DLL -# undef PNG_BUILD_DLL -# endif -# ifdef PNG_USE_DLL -# undef PNG_USE_DLL -# endif -# ifdef PNG_DLL -# undef PNG_DLL -# endif -# ifndef PNG_STATIC -# define PNG_STATIC -# endif -# else -# ifdef PNG_BUILD_DLL -# ifdef PNG_STATIC -# undef PNG_STATIC -# endif -# ifdef PNG_USE_DLL -# undef PNG_USE_DLL -# endif -# ifndef PNG_DLL -# define PNG_DLL -# endif -# else -# ifdef PNG_STATIC -# ifdef PNG_USE_DLL -# undef PNG_USE_DLL -# endif -# ifdef PNG_DLL -# undef PNG_DLL -# endif -# else -# ifndef PNG_USE_DLL -# define PNG_USE_DLL -# endif -# ifndef PNG_DLL -# define PNG_DLL -# endif -# endif -# endif -# endif -#endif - -/* This protects us against compilers that run on a windowing system - * and thus don't have or would rather us not use the stdio types: - * stdin, stdout, and stderr. The only one currently used is stderr - * in png_error() and png_warning(). #defining PNG_NO_CONSOLE_IO will - * prevent these from being compiled and used. #defining PNG_NO_STDIO - * will also prevent these, plus will prevent the entire set of stdio - * macros and functions (FILE *, printf, etc.) from being compiled and used, - * unless (PNG_DEBUG > 0) has been #defined. - * - * #define PNG_NO_CONSOLE_IO - * #define PNG_NO_STDIO - */ - -#ifdef _WIN32_WCE -# define PNG_NO_CONSOLE_IO -# define PNG_NO_STDIO -# define PNG_NO_TIME_RFC1123 -# ifdef PNG_DEBUG -# undef PNG_DEBUG -# endif -#endif - -#if !defined(PNG_NO_STDIO) && !defined(PNG_STDIO_SUPPORTED) -# define PNG_STDIO_SUPPORTED -#endif - -#ifdef PNG_BUILD_DLL -# if !defined(PNG_CONSOLE_IO_SUPPORTED) && !defined(PNG_NO_CONSOLE_IO) -# define PNG_NO_CONSOLE_IO -# endif -#endif - -# ifdef PNG_NO_STDIO -# ifndef PNG_NO_CONSOLE_IO -# define PNG_NO_CONSOLE_IO -# endif -# ifdef PNG_DEBUG -# if (PNG_DEBUG > 0) -# include -# endif -# endif -# else -# include -# endif - -#if !(defined PNG_NO_CONSOLE_IO) && !defined(PNG_CONSOLE_IO_SUPPORTED) -# define PNG_CONSOLE_IO_SUPPORTED -#endif - -/* This macro protects us against machines that don't have function - * prototypes (ie K&R style headers). If your compiler does not handle - * function prototypes, define this macro and use the included ansi2knr. - * I've always been able to use _NO_PROTO as the indicator, but you may - * need to drag the empty declaration out in front of here, or change the - * ifdef to suit your own needs. - */ -#ifndef PNGARG - -#ifdef OF /* zlib prototype munger */ -# define PNGARG(arglist) OF(arglist) -#else - -#ifdef _NO_PROTO -# define PNGARG(arglist) () -#else -# define PNGARG(arglist) arglist -#endif /* _NO_PROTO */ - -#endif /* OF */ - -#endif /* PNGARG */ - -/* Try to determine if we are compiling on a Mac. Note that testing for - * just __MWERKS__ is not good enough, because the Codewarrior is now used - * on non-Mac platforms. - */ -#ifndef MACOS -# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ - defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) -# define MACOS -# endif -#endif - -/* Enough people need this for various reasons to include it here */ -#if !defined(MACOS) && !defined(RISCOS) -# include -#endif - -/* PNG_SETJMP_NOT_SUPPORTED and PNG_NO_SETJMP_SUPPORTED are deprecated. */ -#if !defined(PNG_NO_SETJMP) && \ - !defined(PNG_SETJMP_NOT_SUPPORTED) && !defined(PNG_NO_SETJMP_SUPPORTED) -# define PNG_SETJMP_SUPPORTED +#ifdef PNG_STDIO_SUPPORTED + /* Required for the definition of FILE: */ +# include #endif #ifdef PNG_SETJMP_SUPPORTED -/* This is an attempt to force a single setjmp behaviour on Linux. If - * the X config stuff didn't define _BSD_SOURCE we wouldn't need this. - * - * You can bypass this test if you know that your application uses exactly - * the same setjmp.h that was included when libpng was built. Only define - * PNG_SKIP_SETJMP_CHECK while building your application, prior to the - * application's '#include "png.h"'. Don't define PNG_SKIP_SETJMP_CHECK - * while building a separate libpng library for general use. - */ - -# ifndef PNG_SKIP_SETJMP_CHECK -# ifdef __linux__ -# ifdef _BSD_SOURCE -# define PNG_SAVE_BSD_SOURCE -# undef _BSD_SOURCE -# endif -# ifdef _SETJMP_H - /* If you encounter a compiler error here, see the explanation - * near the end of INSTALL. - */ - __pngconf.h__ in libpng already includes setjmp.h; - __dont__ include it again.; -# endif -# endif /* __linux__ */ -# endif /* PNG_SKIP_SETJMP_CHECK */ - - /* Include setjmp.h for error handling */ + /* Required for the definition of jmp_buf and the declaration of longjmp: */ # include - -# ifdef __linux__ -# ifdef PNG_SAVE_BSD_SOURCE -# ifdef _BSD_SOURCE -# undef _BSD_SOURCE -# endif -# define _BSD_SOURCE -# undef PNG_SAVE_BSD_SOURCE -# endif -# endif /* __linux__ */ -#endif /* PNG_SETJMP_SUPPORTED */ - -#ifdef BSD -# include -#else -# include #endif -/* Other defines for things like memory and the like can go here. */ +#ifdef PNG_CONVERT_tIME_SUPPORTED + /* Required for struct tm: */ +# include +#endif -/* This controls how fine the quantizing gets. As this allocates - * a largish chunk of memory (32K), those who are not as concerned - * with quantizing quality can decrease some or all of these. +#endif /* PNG_BUILDING_SYMBOL_TABLE */ + +/* Prior to 1.6.0 it was possible to turn off 'const' in declarations using + * PNG_NO_CONST; this is no longer supported except for data declarations which + * apparently still cause problems in 2011 on some compilers. */ +#define PNG_CONST const /* backward compatibility only */ -/* Prior to libpng-1.4.2, these were PNG_DITHER_*_BITS - * These migration aids will be removed from libpng-1.5.0. +/* This controls optimization of the reading of 16 and 32 bit values + * from PNG files. It can be set on a per-app-file basis - it + * just changes whether a macro is used when the function is called. + * The library builder sets the default; if read functions are not + * built into the library the macro implementation is forced on. */ -#ifdef PNG_DITHER_RED_BITS -# define PNG_QUANTIZE_RED_BITS PNG_DITHER_RED_BITS -#endif -#ifdef PNG_DITHER_GREEN_BITS -# define PNG_QUANTIZE_GREEN_BITS PNG_DITHER_GREEN_BITS -#endif -#ifdef PNG_DITHER_BLUE_BITS -# define PNG_QUANTIZE_BLUE_BITS PNG_DITHER_BLUE_BITS -#endif - -#ifndef PNG_QUANTIZE_RED_BITS -# define PNG_QUANTIZE_RED_BITS 5 -#endif -#ifndef PNG_QUANTIZE_GREEN_BITS -# define PNG_QUANTIZE_GREEN_BITS 5 -#endif -#ifndef PNG_QUANTIZE_BLUE_BITS -# define PNG_QUANTIZE_BLUE_BITS 5 -#endif - -/* This controls how fine the gamma correction becomes when you - * are only interested in 8 bits anyway. Increasing this value - * results in more memory being used, and more pow() functions - * being called to fill in the gamma tables. Don't set this value - * less then 8, and even that may not work (I haven't tested it). - */ - -#ifndef PNG_MAX_GAMMA_8 -# define PNG_MAX_GAMMA_8 11 -#endif - -/* This controls how much a difference in gamma we can tolerate before - * we actually start doing gamma conversion. - */ -#ifndef PNG_GAMMA_THRESHOLD -# define PNG_GAMMA_THRESHOLD 0.05 -#endif - -/* The following uses const char * instead of char * for error - * and warning message functions, so some compilers won't complain. - * If you do not want to use const, define PNG_NO_CONST. - */ - -#ifndef PNG_CONST -# ifndef PNG_NO_CONST -# define PNG_CONST const -# else -# define PNG_CONST -# endif -#endif - -/* The following defines give you the ability to remove code from the - * library that you will not be using. I wish I could figure out how to - * automate this, but I can't do that without making it seriously hard - * on the users. So if you are not using an ability, change the #define - * to an #undef, or pass in PNG_NO_feature and that part of the library - * will not be compiled. - - * If your linker can't find a function, you may want to make sure the - * ability is defined here. Some of these depend upon some others being - * defined. I haven't figured out all the interactions here, so you may - * have to experiment awhile to get everything to compile. If you are - * creating or using a shared library, you probably shouldn't touch this, - * as it will affect the size of the structures, and this will cause bad - * things to happen if the library and/or application ever change. - */ - -/* Any features you will not be using can be undef'ed here */ - -/* GR-P, 0.96a: Set "*TRANSFORMS_SUPPORTED as default but allow user - * to turn it off with PNG_NO_READ|WRITE_TRANSFORMS on the compile line, - * then pick and choose which ones to define without having to edit this - * file. It is safe to use the PNG_NO_READ|WRITE_TRANSFORMS - * if you only want to have a png-compliant reader/writer but don't need - * any of the extra transformations. This saves about 80 kbytes in a - * typical installation of the library. (PNG_NO_* form added in version - * 1.0.1c, for consistency; PNG_*_TRANSFORMS_NOT_SUPPORTED deprecated in - * 1.4.0) - */ - -/* Ignore attempt to turn off both floating and fixed point support */ -#if !defined(PNG_FLOATING_POINT_SUPPORTED) || \ - !defined(PNG_NO_FIXED_POINT_SUPPORTED) -# define PNG_FIXED_POINT_SUPPORTED -#endif - -#ifdef PNG_READ_SUPPORTED - -/* PNG_READ_TRANSFORMS_NOT_SUPPORTED is deprecated. */ -#if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \ - !defined(PNG_NO_READ_TRANSFORMS) -# define PNG_READ_TRANSFORMS_SUPPORTED -#endif - -#ifdef PNG_READ_TRANSFORMS_SUPPORTED -# ifndef PNG_NO_READ_EXPAND -# define PNG_READ_EXPAND_SUPPORTED -# endif -# ifndef PNG_NO_READ_SHIFT -# define PNG_READ_SHIFT_SUPPORTED -# endif -# ifndef PNG_NO_READ_PACK -# define PNG_READ_PACK_SUPPORTED -# endif -# ifndef PNG_NO_READ_BGR -# define PNG_READ_BGR_SUPPORTED -# endif -# ifndef PNG_NO_READ_SWAP -# define PNG_READ_SWAP_SUPPORTED -# endif -# ifndef PNG_NO_READ_PACKSWAP -# define PNG_READ_PACKSWAP_SUPPORTED -# endif -# ifndef PNG_NO_READ_INVERT -# define PNG_READ_INVERT_SUPPORTED -# endif -# ifndef PNG_NO_READ_QUANTIZE - /* Prior to libpng-1.4.0 this was PNG_READ_DITHER_SUPPORTED */ -# ifndef PNG_NO_READ_DITHER /* This migration aid will be removed */ -# define PNG_READ_QUANTIZE_SUPPORTED -# endif -# endif -# ifndef PNG_NO_READ_BACKGROUND -# define PNG_READ_BACKGROUND_SUPPORTED -# endif -# ifndef PNG_NO_READ_16_TO_8 -# define PNG_READ_16_TO_8_SUPPORTED -# endif -# ifndef PNG_NO_READ_FILLER -# define PNG_READ_FILLER_SUPPORTED -# endif -# ifndef PNG_NO_READ_GAMMA -# define PNG_READ_GAMMA_SUPPORTED -# endif -# ifndef PNG_NO_READ_GRAY_TO_RGB -# define PNG_READ_GRAY_TO_RGB_SUPPORTED -# endif -# ifndef PNG_NO_READ_SWAP_ALPHA -# define PNG_READ_SWAP_ALPHA_SUPPORTED -# endif -# ifndef PNG_NO_READ_INVERT_ALPHA -# define PNG_READ_INVERT_ALPHA_SUPPORTED -# endif -# ifndef PNG_NO_READ_STRIP_ALPHA -# define PNG_READ_STRIP_ALPHA_SUPPORTED -# endif -# ifndef PNG_NO_READ_USER_TRANSFORM -# define PNG_READ_USER_TRANSFORM_SUPPORTED -# endif -# ifndef PNG_NO_READ_RGB_TO_GRAY -# define PNG_READ_RGB_TO_GRAY_SUPPORTED -# endif -#endif /* PNG_READ_TRANSFORMS_SUPPORTED */ - -/* PNG_PROGRESSIVE_READ_NOT_SUPPORTED is deprecated. */ -#if !defined(PNG_NO_PROGRESSIVE_READ) && \ - !defined(PNG_PROGRESSIVE_READ_NOT_SUPPORTED) /* if you don't do progressive */ -# define PNG_PROGRESSIVE_READ_SUPPORTED /* reading. This is not talking */ -#endif /* about interlacing capability! You'll */ - /* still have interlacing unless you change the following define: */ - -#define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */ - -/* PNG_NO_SEQUENTIAL_READ_SUPPORTED is deprecated. */ -#if !defined(PNG_NO_SEQUENTIAL_READ) && \ - !defined(PNG_SEQUENTIAL_READ_SUPPORTED) && \ - !defined(PNG_NO_SEQUENTIAL_READ_SUPPORTED) -# define PNG_SEQUENTIAL_READ_SUPPORTED -#endif - -#ifndef PNG_NO_READ_COMPOSITE_NODIV -# ifndef PNG_NO_READ_COMPOSITED_NODIV /* libpng-1.0.x misspelling */ -# define PNG_READ_COMPOSITE_NODIV_SUPPORTED /* well tested on Intel, SGI */ -# endif -#endif - -#if !defined(PNG_NO_GET_INT_32) || defined(PNG_READ_oFFS_SUPPORTED) || \ - defined(PNG_READ_pCAL_SUPPORTED) -# ifndef PNG_GET_INT_32_SUPPORTED -# define PNG_GET_INT_32_SUPPORTED -# endif -#endif - -#endif /* PNG_READ_SUPPORTED */ - -#ifdef PNG_WRITE_SUPPORTED - -/* PNG_WRITE_TRANSFORMS_NOT_SUPPORTED is deprecated. */ -#if !defined(PNG_WRITE_TRANSFORMS_NOT_SUPPORTED) && \ - !defined(PNG_NO_WRITE_TRANSFORMS) -# define PNG_WRITE_TRANSFORMS_SUPPORTED -#endif - -#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED -# ifndef PNG_NO_WRITE_SHIFT -# define PNG_WRITE_SHIFT_SUPPORTED -# endif -# ifndef PNG_NO_WRITE_PACK -# define PNG_WRITE_PACK_SUPPORTED -# endif -# ifndef PNG_NO_WRITE_BGR -# define PNG_WRITE_BGR_SUPPORTED -# endif -# ifndef PNG_NO_WRITE_SWAP -# define PNG_WRITE_SWAP_SUPPORTED -# endif -# ifndef PNG_NO_WRITE_PACKSWAP -# define PNG_WRITE_PACKSWAP_SUPPORTED -# endif -# ifndef PNG_NO_WRITE_INVERT -# define PNG_WRITE_INVERT_SUPPORTED -# endif -# ifndef PNG_NO_WRITE_FILLER -# define PNG_WRITE_FILLER_SUPPORTED /* same as WRITE_STRIP_ALPHA */ -# endif -# ifndef PNG_NO_WRITE_SWAP_ALPHA -# define PNG_WRITE_SWAP_ALPHA_SUPPORTED -# endif -# ifndef PNG_NO_WRITE_INVERT_ALPHA -# define PNG_WRITE_INVERT_ALPHA_SUPPORTED -# endif -# ifndef PNG_NO_WRITE_USER_TRANSFORM -# define PNG_WRITE_USER_TRANSFORM_SUPPORTED -# endif -#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */ - -#if !defined(PNG_NO_WRITE_INTERLACING_SUPPORTED) && \ - !defined(PNG_WRITE_INTERLACING_SUPPORTED) - /* This is not required for PNG-compliant encoders, but can cause - * trouble if left undefined - */ -# define PNG_WRITE_INTERLACING_SUPPORTED -#endif - -#if !defined(PNG_NO_WRITE_WEIGHTED_FILTER) && \ - !defined(PNG_WRITE_WEIGHTED_FILTER) && \ - defined(PNG_FLOATING_POINT_SUPPORTED) -# define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED -#endif - -#ifndef PNG_NO_WRITE_FLUSH -# define PNG_WRITE_FLUSH_SUPPORTED -#endif - -#if !defined(PNG_NO_SAVE_INT_32) || defined(PNG_WRITE_oFFS_SUPPORTED) || \ - defined(PNG_WRITE_pCAL_SUPPORTED) -# ifndef PNG_SAVE_INT_32_SUPPORTED -# define PNG_SAVE_INT_32_SUPPORTED -# endif -#endif - -#endif /* PNG_WRITE_SUPPORTED */ - -#define PNG_NO_ERROR_NUMBERS - -#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ - defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) -# ifndef PNG_NO_USER_TRANSFORM_PTR -# define PNG_USER_TRANSFORM_PTR_SUPPORTED -# endif -#endif - -#if defined(PNG_STDIO_SUPPORTED) && !defined(PNG_TIME_RFC1123_SUPPORTED) -# define PNG_TIME_RFC1123_SUPPORTED -#endif - -/* This adds extra functions in pngget.c for accessing data from the - * info pointer (added in version 0.99) - * png_get_image_width() - * png_get_image_height() - * png_get_bit_depth() - * png_get_color_type() - * png_get_compression_type() - * png_get_filter_type() - * png_get_interlace_type() - * png_get_pixel_aspect_ratio() - * png_get_pixels_per_meter() - * png_get_x_offset_pixels() - * png_get_y_offset_pixels() - * png_get_x_offset_microns() - * png_get_y_offset_microns() - */ -#if !defined(PNG_NO_EASY_ACCESS) && !defined(PNG_EASY_ACCESS_SUPPORTED) -# define PNG_EASY_ACCESS_SUPPORTED -#endif - -/* Added at libpng-1.2.0 */ -#if !defined(PNG_NO_USER_MEM) && !defined(PNG_USER_MEM_SUPPORTED) -# define PNG_USER_MEM_SUPPORTED -#endif - -/* Added at libpng-1.2.6 */ -#ifndef PNG_NO_SET_USER_LIMITS -# ifndef PNG_SET_USER_LIMITS_SUPPORTED -# define PNG_SET_USER_LIMITS_SUPPORTED -# endif - /* Feature added at libpng-1.4.0, this flag added at 1.4.1 */ -# ifndef PNG_SET_CHUNK_CACHE_LIMIT_SUPPORTED -# define PNG_SET_CHUNK_CACHE_LIMIT_SUPPORTED -# endif - /* Feature added at libpng-1.4.1, this flag added at 1.4.1 */ -# ifndef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED -# define PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED -# endif -#endif - -/* Added at libpng-1.2.43 */ -#ifndef PNG_USER_LIMITS_SUPPORTED -# ifndef PNG_NO_USER_LIMITS -# define PNG_USER_LIMITS_SUPPORTED -# endif -#endif - -/* Added at libpng-1.0.16 and 1.2.6. To accept all valid PNGs no matter - * how large, set these two limits to 0x7fffffffL - */ -#ifndef PNG_USER_WIDTH_MAX -# define PNG_USER_WIDTH_MAX 1000000L -#endif -#ifndef PNG_USER_HEIGHT_MAX -# define PNG_USER_HEIGHT_MAX 1000000L -#endif - -/* Added at libpng-1.2.43. To accept all valid PNGs no matter - * how large, set these two limits to 0. - */ -#ifndef PNG_USER_CHUNK_CACHE_MAX -# define PNG_USER_CHUNK_CACHE_MAX 0 -#endif - -/* Added at libpng-1.2.43 */ -#ifndef PNG_USER_CHUNK_MALLOC_MAX -# define PNG_USER_CHUNK_MALLOC_MAX 0 -#endif - -/* Added at libpng-1.4.0 */ -#if !defined(PNG_NO_IO_STATE) && !defined(PNG_IO_STATE_SUPPORTED) -# define PNG_IO_STATE_SUPPORTED -#endif - -#ifndef PNG_LITERAL_SHARP -# define PNG_LITERAL_SHARP 0x23 -#endif -#ifndef PNG_LITERAL_LEFT_SQUARE_BRACKET -# define PNG_LITERAL_LEFT_SQUARE_BRACKET 0x5b -#endif -#ifndef PNG_LITERAL_RIGHT_SQUARE_BRACKET -# define PNG_LITERAL_RIGHT_SQUARE_BRACKET 0x5d -#endif -#ifndef PNG_STRING_NEWLINE -#define PNG_STRING_NEWLINE "\n" -#endif - -/* These are currently experimental features, define them if you want */ - -/* Very little testing */ -/* -#ifdef PNG_READ_SUPPORTED -# ifndef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED -# define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED -# endif -#endif -*/ - -/* This is only for PowerPC big-endian and 680x0 systems */ -/* some testing */ -/* -#ifndef PNG_READ_BIG_ENDIAN_SUPPORTED -# define PNG_READ_BIG_ENDIAN_SUPPORTED -#endif -*/ - -#if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS) +#ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED # define PNG_USE_READ_MACROS #endif - -/* Buggy compilers (e.g., gcc 2.7.2.2) need PNG_NO_POINTER_INDEXING */ - -#if !defined(PNG_NO_POINTER_INDEXING) && \ - !defined(PNG_POINTER_INDEXING_SUPPORTED) -# define PNG_POINTER_INDEXING_SUPPORTED +#if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS) +# if PNG_DEFAULT_READ_MACROS +# define PNG_USE_READ_MACROS +# endif #endif - -/* Any chunks you are not interested in, you can undef here. The - * ones that allocate memory may be expecially important (hIST, - * tEXt, zTXt, tRNS, pCAL). Others will just save time and make png_info - * a bit smaller. +/* COMPILER SPECIFIC OPTIONS. + * + * These options are provided so that a variety of difficult compilers + * can be used. Some are fixed at build time (e.g. PNG_API_RULE + * below) but still have compiler specific implementations, others + * may be changed on a per-file basis when compiling against libpng. */ -/* The size of the png_text structure changed in libpng-1.0.6 when - * iTXt support was added. iTXt support was turned off by default through - * libpng-1.2.x, to support old apps that malloc the png_text structure - * instead of calling png_set_text() and letting libpng malloc it. It - * was turned on by default in libpng-1.4.0. +/* The PNGARG macro was used in versions of libpng prior to 1.6.0 to protect + * against legacy (pre ISOC90) compilers that did not understand function + * prototypes. It is not required for modern C compilers. + */ +#ifndef PNGARG +# define PNGARG(arglist) arglist +#endif + +/* Function calling conventions. + * ============================= + * Normally it is not necessary to specify to the compiler how to call + * a function - it just does it - however on x86 systems derived from + * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems + * and some others) there are multiple ways to call a function and the + * default can be changed on the compiler command line. For this reason + * libpng specifies the calling convention of every exported function and + * every function called via a user supplied function pointer. This is + * done in this file by defining the following macros: + * + * PNGAPI Calling convention for exported functions. + * PNGCBAPI Calling convention for user provided (callback) functions. + * PNGCAPI Calling convention used by the ANSI-C library (required + * for longjmp callbacks and sometimes used internally to + * specify the calling convention for zlib). + * + * These macros should never be overridden. If it is necessary to + * change calling convention in a private build this can be done + * by setting PNG_API_RULE (which defaults to 0) to one of the values + * below to select the correct 'API' variants. + * + * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout. + * This is correct in every known environment. + * PNG_API_RULE=1 Use the operating system convention for PNGAPI and + * the 'C' calling convention (from PNGCAPI) for + * callbacks (PNGCBAPI). This is no longer required + * in any known environment - if it has to be used + * please post an explanation of the problem to the + * libpng mailing list. + * + * These cases only differ if the operating system does not use the C + * calling convention, at present this just means the above cases + * (x86 DOS/Windows sytems) and, even then, this does not apply to + * Cygwin running on those systems. + * + * Note that the value must be defined in pnglibconf.h so that what + * the application uses to call the library matches the conventions + * set when building the library. */ -/* PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED is deprecated. */ -#if defined(PNG_READ_SUPPORTED) && \ - !defined(PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \ - !defined(PNG_NO_READ_ANCILLARY_CHUNKS) -# define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED -#endif - -/* PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED is deprecated. */ -#if defined(PNG_WRITE_SUPPORTED) && \ - !defined(PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \ - !defined(PNG_NO_WRITE_ANCILLARY_CHUNKS) -# define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED -#endif - -#ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED - -#ifdef PNG_NO_READ_TEXT -# define PNG_NO_READ_iTXt -# define PNG_NO_READ_tEXt -# define PNG_NO_READ_zTXt -#endif - -#ifndef PNG_NO_READ_bKGD -# define PNG_READ_bKGD_SUPPORTED -# define PNG_bKGD_SUPPORTED -#endif -#ifndef PNG_NO_READ_cHRM -# define PNG_READ_cHRM_SUPPORTED -# define PNG_cHRM_SUPPORTED -#endif -#ifndef PNG_NO_READ_gAMA -# define PNG_READ_gAMA_SUPPORTED -# define PNG_gAMA_SUPPORTED -#endif -#ifndef PNG_NO_READ_hIST -# define PNG_READ_hIST_SUPPORTED -# define PNG_hIST_SUPPORTED -#endif -#ifndef PNG_NO_READ_iCCP -# define PNG_READ_iCCP_SUPPORTED -# define PNG_iCCP_SUPPORTED -#endif -#ifndef PNG_NO_READ_iTXt -# ifndef PNG_READ_iTXt_SUPPORTED -# define PNG_READ_iTXt_SUPPORTED -# endif -# ifndef PNG_iTXt_SUPPORTED -# define PNG_iTXt_SUPPORTED -# endif -#endif -#ifndef PNG_NO_READ_oFFs -# define PNG_READ_oFFs_SUPPORTED -# define PNG_oFFs_SUPPORTED -#endif -#ifndef PNG_NO_READ_pCAL -# define PNG_READ_pCAL_SUPPORTED -# define PNG_pCAL_SUPPORTED -#endif -#ifndef PNG_NO_READ_sCAL -# define PNG_READ_sCAL_SUPPORTED -# define PNG_sCAL_SUPPORTED -#endif -#ifndef PNG_NO_READ_pHYs -# define PNG_READ_pHYs_SUPPORTED -# define PNG_pHYs_SUPPORTED -#endif -#ifndef PNG_NO_READ_sBIT -# define PNG_READ_sBIT_SUPPORTED -# define PNG_sBIT_SUPPORTED -#endif -#ifndef PNG_NO_READ_sPLT -# define PNG_READ_sPLT_SUPPORTED -# define PNG_sPLT_SUPPORTED -#endif -#ifndef PNG_NO_READ_sRGB -# define PNG_READ_sRGB_SUPPORTED -# define PNG_sRGB_SUPPORTED -#endif -#ifndef PNG_NO_READ_tEXt -# define PNG_READ_tEXt_SUPPORTED -# define PNG_tEXt_SUPPORTED -#endif -#ifndef PNG_NO_READ_tIME -# define PNG_READ_tIME_SUPPORTED -# define PNG_tIME_SUPPORTED -#endif -#ifndef PNG_NO_READ_tRNS -# define PNG_READ_tRNS_SUPPORTED -# define PNG_tRNS_SUPPORTED -#endif -#ifndef PNG_NO_READ_zTXt -# define PNG_READ_zTXt_SUPPORTED -# define PNG_zTXt_SUPPORTED -#endif -#ifndef PNG_NO_READ_OPT_PLTE -# define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */ -#endif /* optional PLTE chunk in RGB and RGBA images */ -#if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \ - defined(PNG_READ_zTXt_SUPPORTED) -# define PNG_READ_TEXT_SUPPORTED -# define PNG_TEXT_SUPPORTED -#endif - -#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */ - -#ifndef PNG_NO_READ_UNKNOWN_CHUNKS -# ifndef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED -# define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED -# endif -# ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED -# define PNG_UNKNOWN_CHUNKS_SUPPORTED -# endif -# ifndef PNG_READ_USER_CHUNKS_SUPPORTED -# define PNG_READ_USER_CHUNKS_SUPPORTED -# endif -#endif -#ifndef PNG_NO_READ_USER_CHUNKS -# ifndef PNG_READ_USER_CHUNKS_SUPPORTED -# define PNG_READ_USER_CHUNKS_SUPPORTED -# endif -# ifndef PNG_USER_CHUNKS_SUPPORTED -# define PNG_USER_CHUNKS_SUPPORTED -# endif -#endif -#ifndef PNG_NO_HANDLE_AS_UNKNOWN -# ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED -# define PNG_HANDLE_AS_UNKNOWN_SUPPORTED -# endif -#endif - -#ifdef PNG_WRITE_SUPPORTED -#ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED - -#ifdef PNG_NO_WRITE_TEXT -# define PNG_NO_WRITE_iTXt -# define PNG_NO_WRITE_tEXt -# define PNG_NO_WRITE_zTXt -#endif -#ifndef PNG_NO_WRITE_bKGD -# define PNG_WRITE_bKGD_SUPPORTED -# ifndef PNG_bKGD_SUPPORTED -# define PNG_bKGD_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_cHRM -# define PNG_WRITE_cHRM_SUPPORTED -# ifndef PNG_cHRM_SUPPORTED -# define PNG_cHRM_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_gAMA -# define PNG_WRITE_gAMA_SUPPORTED -# ifndef PNG_gAMA_SUPPORTED -# define PNG_gAMA_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_hIST -# define PNG_WRITE_hIST_SUPPORTED -# ifndef PNG_hIST_SUPPORTED -# define PNG_hIST_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_iCCP -# define PNG_WRITE_iCCP_SUPPORTED -# ifndef PNG_iCCP_SUPPORTED -# define PNG_iCCP_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_iTXt -# ifndef PNG_WRITE_iTXt_SUPPORTED -# define PNG_WRITE_iTXt_SUPPORTED -# endif -# ifndef PNG_iTXt_SUPPORTED -# define PNG_iTXt_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_oFFs -# define PNG_WRITE_oFFs_SUPPORTED -# ifndef PNG_oFFs_SUPPORTED -# define PNG_oFFs_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_pCAL -# define PNG_WRITE_pCAL_SUPPORTED -# ifndef PNG_pCAL_SUPPORTED -# define PNG_pCAL_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_sCAL -# define PNG_WRITE_sCAL_SUPPORTED -# ifndef PNG_sCAL_SUPPORTED -# define PNG_sCAL_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_pHYs -# define PNG_WRITE_pHYs_SUPPORTED -# ifndef PNG_pHYs_SUPPORTED -# define PNG_pHYs_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_sBIT -# define PNG_WRITE_sBIT_SUPPORTED -# ifndef PNG_sBIT_SUPPORTED -# define PNG_sBIT_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_sPLT -# define PNG_WRITE_sPLT_SUPPORTED -# ifndef PNG_sPLT_SUPPORTED -# define PNG_sPLT_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_sRGB -# define PNG_WRITE_sRGB_SUPPORTED -# ifndef PNG_sRGB_SUPPORTED -# define PNG_sRGB_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_tEXt -# define PNG_WRITE_tEXt_SUPPORTED -# ifndef PNG_tEXt_SUPPORTED -# define PNG_tEXt_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_tIME -# define PNG_WRITE_tIME_SUPPORTED -# ifndef PNG_tIME_SUPPORTED -# define PNG_tIME_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_tRNS -# define PNG_WRITE_tRNS_SUPPORTED -# ifndef PNG_tRNS_SUPPORTED -# define PNG_tRNS_SUPPORTED -# endif -#endif -#ifndef PNG_NO_WRITE_zTXt -# define PNG_WRITE_zTXt_SUPPORTED -# ifndef PNG_zTXt_SUPPORTED -# define PNG_zTXt_SUPPORTED -# endif -#endif -#if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \ - defined(PNG_WRITE_zTXt_SUPPORTED) -# define PNG_WRITE_TEXT_SUPPORTED -# ifndef PNG_TEXT_SUPPORTED -# define PNG_TEXT_SUPPORTED -# endif -#endif - -#ifdef PNG_WRITE_tIME_SUPPORTED -# ifndef PNG_NO_CONVERT_tIME -# ifndef _WIN32_WCE -/* The "tm" structure is not supported on WindowsCE */ -# ifndef PNG_CONVERT_tIME_SUPPORTED -# define PNG_CONVERT_tIME_SUPPORTED -# endif -# endif -# endif -#endif - -#endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */ - -#ifndef PNG_NO_WRITE_FILTER -# ifndef PNG_WRITE_FILTER_SUPPORTED -# define PNG_WRITE_FILTER_SUPPORTED -# endif -#endif - -#ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS -# define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED -# ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED -# define PNG_UNKNOWN_CHUNKS_SUPPORTED -# endif -#endif -#ifndef PNG_NO_HANDLE_AS_UNKNOWN -# ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED -# define PNG_HANDLE_AS_UNKNOWN_SUPPORTED -# endif -#endif -#endif /* PNG_WRITE_SUPPORTED */ - -/* Turn this off to disable png_read_png() and - * png_write_png() and leave the row_pointers member - * out of the info structure. - */ -#ifndef PNG_NO_INFO_IMAGE -# define PNG_INFO_IMAGE_SUPPORTED -#endif - -/* Need the time information for converting tIME chunks */ -#ifdef PNG_CONVERT_tIME_SUPPORTED - /* "time.h" functions are not supported on WindowsCE */ -# include -#endif - -/* Some typedefs to get us started. These should be safe on most of the - * common platforms. The typedefs should be at least as large as the - * numbers suggest (a png_uint_32 must be at least 32 bits long), but they - * don't have to be exactly that size. Some compilers dislike passing - * unsigned shorts as function parameters, so you may be better off using - * unsigned int for png_uint_16. +/* Symbol export + * ============= + * When building a shared library it is almost always necessary to tell + * the compiler which symbols to export. The png.h macro 'PNG_EXPORT' + * is used to mark the symbols. On some systems these symbols can be + * extracted at link time and need no special processing by the compiler, + * on other systems the symbols are flagged by the compiler and just + * the declaration requires a special tag applied (unfortunately) in a + * compiler dependent way. Some systems can do either. + * + * A small number of older systems also require a symbol from a DLL to + * be flagged to the program that calls it. This is a problem because + * we do not know in the header file included by application code that + * the symbol will come from a shared library, as opposed to a statically + * linked one. For this reason the application must tell us by setting + * the magic flag PNG_USE_DLL to turn on the special processing before + * it includes png.h. + * + * Four additional macros are used to make this happen: + * + * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from + * the build or imported if PNG_USE_DLL is set - compiler + * and system specific. + * + * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to + * 'type', compiler specific. + * + * PNG_DLL_EXPORT Set to the magic to use during a libpng build to + * make a symbol exported from the DLL. Not used in the + * public header files; see pngpriv.h for how it is used + * in the libpng build. + * + * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come + * from a DLL - used to define PNG_IMPEXP when + * PNG_USE_DLL is set. */ -#if defined(INT_MAX) && (INT_MAX > 0x7ffffffeL) -typedef unsigned int png_uint_32; -typedef int png_int_32; -#else -typedef unsigned long png_uint_32; -typedef long png_int_32; -#endif -typedef unsigned short png_uint_16; -typedef short png_int_16; -typedef unsigned char png_byte; - -#ifdef PNG_NO_SIZE_T - typedef unsigned int png_size_t; -#else - typedef size_t png_size_t; -#endif -#define png_sizeof(x) (sizeof (x)) - -/* The following is needed for medium model support. It cannot be in the - * pngpriv.h header. Needs modification for other compilers besides - * MSC. Model independent support declares all arrays and pointers to be - * large using the far keyword. The zlib version used must also support - * model independent data. As of version zlib 1.0.4, the necessary changes - * have been made in zlib. The USE_FAR_KEYWORD define triggers other - * changes that are needed. (Tim Wegner) +/* System specific discovery. + * ========================== + * This code is used at build time to find PNG_IMPEXP, the API settings + * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL + * import processing is possible. On Windows systems it also sets + * compiler-specific macros to the values required to change the calling + * conventions of the various functions. */ +#if defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\ + defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) + /* Windows system (DOS doesn't support DLLs). Includes builds under Cygwin or + * MinGW on any architecture currently supported by Windows. Also includes + * Watcom builds but these need special treatment because they are not + * compatible with GCC or Visual C because of different calling conventions. + */ +# if PNG_API_RULE == 2 + /* If this line results in an error, either because __watcall is not + * understood or because of a redefine just below you cannot use *this* + * build of the library with the compiler you are using. *This* build was + * build using Watcom and applications must also be built using Watcom! + */ +# define PNGCAPI __watcall +# endif -/* Separate compiler dependencies (problem here is that zlib.h always - * defines FAR. (SJT) - */ -#ifdef __BORLANDC__ -# if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__) -# define LDATA 1 +# if defined(__GNUC__) || (defined(_MSC_VER) && (_MSC_VER >= 800)) +# define PNGCAPI __cdecl +# if PNG_API_RULE == 1 + /* If this line results in an error __stdcall is not understood and + * PNG_API_RULE should not have been set to '1'. + */ +# define PNGAPI __stdcall +# endif # else -# define LDATA 0 + /* An older compiler, or one not detected (erroneously) above, + * if necessary override on the command line to get the correct + * variants for the compiler. + */ +# ifndef PNGCAPI +# define PNGCAPI _cdecl +# endif +# if PNG_API_RULE == 1 && !defined(PNGAPI) +# define PNGAPI _stdcall +# endif +# endif /* compiler/api */ + + /* NOTE: PNGCBAPI always defaults to PNGCAPI. */ + +# if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD) +# error "PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed" # endif - /* GRR: why is Cygwin in here? Cygwin is not Borland C... */ -# if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__) -# define PNG_MAX_MALLOC_64K -# if (LDATA != 1) -# ifndef FAR -# define FAR __far -# endif -# define USE_FAR_KEYWORD -# endif /* LDATA != 1 */ - /* Possibly useful for moving data out of default segment. - * Uncomment it if you want. Could also define FARDATA as - * const if your compiler supports it. (SJT) -# define FARDATA FAR - */ -# endif /* __WIN32__, __FLAT__, __CYGWIN__ */ -#endif /* __BORLANDC__ */ +# if (defined(_MSC_VER) && _MSC_VER < 800) ||\ + (defined(__BORLANDC__) && __BORLANDC__ < 0x500) + /* older Borland and MSC + * compilers used '__export' and required this to be after + * the type. + */ +# ifndef PNG_EXPORT_TYPE +# define PNG_EXPORT_TYPE(type) type PNG_IMPEXP +# endif +# define PNG_DLL_EXPORT __export +# else /* newer compiler */ +# define PNG_DLL_EXPORT __declspec(dllexport) +# ifndef PNG_DLL_IMPORT +# define PNG_DLL_IMPORT __declspec(dllimport) +# endif +# endif /* compiler */ -/* Suggest testing for specific compiler first before testing for - * FAR. The Watcom compiler defines both __MEDIUM__ and M_I86MM, - * making reliance oncertain keywords suspect. (SJT) +#else /* !Windows */ +# if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__) +# define PNGAPI _System +# else /* !Windows/x86 && !OS/2 */ + /* Use the defaults, or define PNG*API on the command line (but + * this will have to be done for every compile!) + */ +# endif /* other system, !OS/2 */ +#endif /* !Windows/x86 */ + +/* Now do all the defaulting . */ +#ifndef PNGCAPI +# define PNGCAPI +#endif +#ifndef PNGCBAPI +# define PNGCBAPI PNGCAPI +#endif +#ifndef PNGAPI +# define PNGAPI PNGCAPI +#endif + +/* PNG_IMPEXP may be set on the compilation system command line or (if not set) + * then in an internal header file when building the library, otherwise (when + * using the library) it is set here. */ - -/* MSC Medium model */ -#ifdef FAR -# ifdef M_I86MM -# define USE_FAR_KEYWORD -# define FARDATA FAR -# include -# endif -#endif - -/* SJT: default case */ -#ifndef FAR -# define FAR -#endif - -/* At this point FAR is always defined */ -#ifndef FARDATA -# define FARDATA -#endif - -/* Typedef for floating-point numbers that are converted - to fixed-point with a multiple of 100,000, e.g., int_gamma */ -typedef png_int_32 png_fixed_point; - -/* Add typedefs for pointers */ -typedef void FAR * png_voidp; -typedef png_byte FAR * png_bytep; -typedef png_uint_32 FAR * png_uint_32p; -typedef png_int_32 FAR * png_int_32p; -typedef png_uint_16 FAR * png_uint_16p; -typedef png_int_16 FAR * png_int_16p; -typedef PNG_CONST char FAR * png_const_charp; -typedef char FAR * png_charp; -typedef png_fixed_point FAR * png_fixed_point_p; - -#ifndef PNG_NO_STDIO -typedef FILE * png_FILE_p; -#endif - -#ifdef PNG_FLOATING_POINT_SUPPORTED -typedef double FAR * png_doublep; -#endif - -/* Pointers to pointers; i.e. arrays */ -typedef png_byte FAR * FAR * png_bytepp; -typedef png_uint_32 FAR * FAR * png_uint_32pp; -typedef png_int_32 FAR * FAR * png_int_32pp; -typedef png_uint_16 FAR * FAR * png_uint_16pp; -typedef png_int_16 FAR * FAR * png_int_16pp; -typedef PNG_CONST char FAR * FAR * png_const_charpp; -typedef char FAR * FAR * png_charpp; -typedef png_fixed_point FAR * FAR * png_fixed_point_pp; -#ifdef PNG_FLOATING_POINT_SUPPORTED -typedef double FAR * FAR * png_doublepp; -#endif - -/* Pointers to pointers to pointers; i.e., pointer to array */ -typedef char FAR * FAR * FAR * png_charppp; - -/* Define PNG_BUILD_DLL if the module being built is a Windows - * LIBPNG DLL. - * - * Define PNG_USE_DLL if you want to *link* to the Windows LIBPNG DLL. - * It is equivalent to Microsoft predefined macro _DLL that is - * automatically defined when you compile using the share - * version of the CRT (C Run-Time library) - * - * The cygwin mods make this behavior a little different: - * Define PNG_BUILD_DLL if you are building a dll for use with cygwin - * Define PNG_STATIC if you are building a static library for use with cygwin, - * -or- if you are building an application that you want to link to the - * static library. - * PNG_USE_DLL is defined by default (no user action needed) unless one of - * the other flags is defined. - */ - -#if !defined(PNG_DLL) && (defined(PNG_BUILD_DLL) || defined(PNG_USE_DLL)) -# define PNG_DLL -#endif - -/* If you define PNGAPI, e.g., with compiler option "-DPNGAPI=__stdcall", - * you may get warnings regarding the linkage of png_zalloc and png_zfree. - * Don't ignore those warnings; you must also reset the default calling - * convention in your compiler to match your PNGAPI, and you must build - * zlib and your applications the same way you build libpng. - */ - -#ifdef __CYGWIN__ -# undef PNGAPI -# define PNGAPI __cdecl -# undef PNG_IMPEXP -# define PNG_IMPEXP -#endif - -#ifdef __WATCOMC__ -# ifndef PNGAPI -# define PNGAPI -# endif -#endif - -#if defined(__MINGW32__) && !defined(PNG_MODULEDEF) -# ifndef PNG_NO_MODULEDEF -# define PNG_NO_MODULEDEF -# endif -#endif - -#if !defined(PNG_IMPEXP) && defined(PNG_BUILD_DLL) && !defined(PNG_NO_MODULEDEF) -# define PNG_IMPEXP -#endif - -#if defined(PNG_DLL) || defined(_DLL) || defined(__DLL__ ) || \ - (( defined(_Windows) || defined(_WINDOWS) || \ - defined(WIN32) || defined(_WIN32) || defined(__WIN32__) )) - -# ifndef PNGAPI -# if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800)) -# define PNGAPI __cdecl -# else -# define PNGAPI _cdecl -# endif -# endif - -# if !defined(PNG_IMPEXP) && (!defined(PNG_DLL) || \ - 0 /* WINCOMPILER_WITH_NO_SUPPORT_FOR_DECLIMPEXP */) -# define PNG_IMPEXP +#ifndef PNG_IMPEXP +# if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT) + /* This forces use of a DLL, disallowing static linking */ +# define PNG_IMPEXP PNG_DLL_IMPORT # endif # ifndef PNG_IMPEXP - -# define PNG_EXPORT_TYPE1(type,symbol) PNG_IMPEXP type PNGAPI symbol -# define PNG_EXPORT_TYPE2(type,symbol) type PNG_IMPEXP PNGAPI symbol - - /* Borland/Microsoft */ -# if defined(_MSC_VER) || defined(__BORLANDC__) -# if (_MSC_VER >= 800) || (__BORLANDC__ >= 0x500) -# define PNG_EXPORT PNG_EXPORT_TYPE1 -# else -# define PNG_EXPORT PNG_EXPORT_TYPE2 -# ifdef PNG_BUILD_DLL -# define PNG_IMPEXP __export -# else -# define PNG_IMPEXP /*__import */ /* doesn't exist AFAIK in VC++ */ -# endif /* Exists in Borland C++ for - C++ classes (== huge) */ -# endif -# endif - -# ifndef PNG_IMPEXP -# ifdef PNG_BUILD_DLL -# define PNG_IMPEXP __declspec(dllexport) -# else -# define PNG_IMPEXP __declspec(dllimport) -# endif -# endif -# endif /* PNG_IMPEXP */ -#else /* !(DLL || non-cygwin WINDOWS) */ -# if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__) -# ifndef PNGAPI -# define PNGAPI _System -# endif -# else -# if 0 /* ... other platforms, with other meanings */ -# endif -# endif -#endif - -#ifndef PNGAPI -# define PNGAPI -#endif -#ifndef PNG_IMPEXP -# define PNG_IMPEXP -#endif - -#ifdef PNG_BUILDSYMS -# ifndef PNG_EXPORT -# define PNG_EXPORT(type,symbol) PNG_FUNCTION_EXPORT symbol END +# define PNG_IMPEXP # endif #endif -#ifndef PNG_EXPORT -# define PNG_EXPORT(type,symbol) PNG_IMPEXP type PNGAPI symbol +/* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat + * 'attributes' as a storage class - the attributes go at the start of the + * function definition, and attributes are always appended regardless of the + * compiler. This considerably simplifies these macros but may cause problems + * if any compilers both need function attributes and fail to handle them as + * a storage class (this is unlikely.) + */ +#ifndef PNG_FUNCTION +# define PNG_FUNCTION(type, name, args, attributes) attributes type name args #endif -#define PNG_USE_LOCAL_ARRAYS /* Not used in libpng, defined for legacy apps */ +#ifndef PNG_EXPORT_TYPE +# define PNG_EXPORT_TYPE(type) PNG_IMPEXP type +#endif + + /* The ordinal value is only relevant when preprocessing png.h for symbol + * table entries, so we discard it here. See the .dfn files in the + * scripts directory. + */ +#ifndef PNG_EXPORTA + +# define PNG_EXPORTA(ordinal, type, name, args, attributes)\ + PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args), \ + extern attributes) +#endif + +/* ANSI-C (C90) does not permit a macro to be invoked with an empty argument, + * so make something non-empty to satisfy the requirement: + */ +#define PNG_EMPTY /*empty list*/ + +#define PNG_EXPORT(ordinal, type, name, args)\ + PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY) + +/* Use PNG_REMOVED to comment out a removed interface. */ +#ifndef PNG_REMOVED +# define PNG_REMOVED(ordinal, type, name, args, attributes) +#endif + +#ifndef PNG_CALLBACK +# define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args) +#endif /* Support for compiler specific function attributes. These are used * so that where compiler support is available incorrect use of API @@ -1365,42 +355,71 @@ typedef char FAR * FAR * FAR * png_charppp; #endif #ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED -/* Support for compiler specific function attributes. These are used - * so that where compiler support is available incorrect use of API - * functions in png.h will generate compiler warnings. Added at libpng - * version 1.2.41. - */ -# ifdef __GNUC__ + /* Support for compiler specific function attributes. These are used + * so that where compiler support is available, incorrect use of API + * functions in png.h will generate compiler warnings. Added at libpng + * version 1.2.41. Disabling these removes the warnings but may also produce + * less efficient code. + */ +# if defined(__GNUC__) # ifndef PNG_USE_RESULT # define PNG_USE_RESULT __attribute__((__warn_unused_result__)) # endif # ifndef PNG_NORETURN # define PNG_NORETURN __attribute__((__noreturn__)) # endif +# if __GNUC__ >= 3 +# ifndef PNG_ALLOCATED +# define PNG_ALLOCATED __attribute__((__malloc__)) +# endif +# ifndef PNG_DEPRECATED +# define PNG_DEPRECATED __attribute__((__deprecated__)) +# endif +# ifndef PNG_PRIVATE +# if 0 /* Doesn't work so we use deprecated instead*/ +# define PNG_PRIVATE \ + __attribute__((warning("This function is not exported by libpng."))) +# else +# define PNG_PRIVATE \ + __attribute__((__deprecated__)) +# endif +# endif +# if ((__GNUC__ != 3) || !defined(__GNUC_MINOR__) || (__GNUC_MINOR__ >= 1)) +# ifndef PNG_RESTRICT +# define PNG_RESTRICT __restrict +# endif +# endif /* __GNUC__ == 3.0 */ +# endif /* __GNUC__ >= 3 */ + +# elif defined(_MSC_VER) && (_MSC_VER >= 1300) +# ifndef PNG_USE_RESULT +# define PNG_USE_RESULT /* not supported */ +# endif +# ifndef PNG_NORETURN +# define PNG_NORETURN __declspec(noreturn) +# endif # ifndef PNG_ALLOCATED -# define PNG_ALLOCATED __attribute__((__malloc__)) +# if (_MSC_VER >= 1400) +# define PNG_ALLOCATED __declspec(restrict) +# endif # endif # ifndef PNG_DEPRECATED -# define PNG_DEPRECATED __attribute__((__deprecated__)) -# endif - - /* This specifically protects structure members that should only be - * accessed from within the library, therefore should be empty during - * a library build. - */ -# ifndef PNG_DEPSTRUCT -# define PNG_DEPSTRUCT __attribute__((__deprecated__)) +# define PNG_DEPRECATED __declspec(deprecated) # endif # ifndef PNG_PRIVATE -# if 0 /* Doesn't work so we use deprecated instead*/ -# define PNG_PRIVATE \ - __attribute__((warning("This function is not exported by libpng."))) -# else -# define PNG_PRIVATE \ - __attribute__((__deprecated__)) +# define PNG_PRIVATE __declspec(deprecated) +# endif +# ifndef PNG_RESTRICT +# if (_MSC_VER >= 1400) +# define PNG_RESTRICT __restrict # endif -# endif /* PNG_PRIVATE */ -# endif /* __GNUC__ */ +# endif + +# elif defined(__WATCOMC__) +# ifndef PNG_RESTRICT +# define PNG_RESTRICT __restrict +# endif +# endif /* _MSC_VER */ #endif /* PNG_PEDANTIC_WARNINGS */ #ifndef PNG_DEPRECATED @@ -1415,126 +434,184 @@ typedef char FAR * FAR * FAR * png_charppp; #ifndef PNG_ALLOCATED # define PNG_ALLOCATED /* The result of the function is new memory */ #endif -#ifndef PNG_DEPSTRUCT -# define PNG_DEPSTRUCT /* Access to this struct member is deprecated */ -#endif #ifndef PNG_PRIVATE # define PNG_PRIVATE /* This is a private libpng function */ #endif +#ifndef PNG_RESTRICT +# define PNG_RESTRICT /* The C99 "restrict" feature */ +#endif +#ifndef PNG_FP_EXPORT /* A floating point API. */ +# ifdef PNG_FLOATING_POINT_SUPPORTED +# define PNG_FP_EXPORT(ordinal, type, name, args)\ + PNG_EXPORT(ordinal, type, name, args); +# else /* No floating point APIs */ +# define PNG_FP_EXPORT(ordinal, type, name, args) +# endif +#endif +#ifndef PNG_FIXED_EXPORT /* A fixed point API. */ +# ifdef PNG_FIXED_POINT_SUPPORTED +# define PNG_FIXED_EXPORT(ordinal, type, name, args)\ + PNG_EXPORT(ordinal, type, name, args); +# else /* No fixed point APIs */ +# define PNG_FIXED_EXPORT(ordinal, type, name, args) +# endif +#endif -/* Users may want to use these so they are not private. Any library - * functions that are passed far data must be model-independent. +#ifndef PNG_BUILDING_SYMBOL_TABLE +/* Some typedefs to get us started. These should be safe on most of the common + * platforms. + * + * png_uint_32 and png_int_32 may, currently, be larger than required to hold a + * 32-bit value however this is not normally advisable. + * + * png_uint_16 and png_int_16 should always be two bytes in size - this is + * verified at library build time. + * + * png_byte must always be one byte in size. + * + * The checks below use constants from limits.h, as defined by the ISOC90 + * standard. */ - -/* memory model/platform independent fns */ -#ifndef PNG_ABORT -# if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) -# define PNG_ABORT() ExitProcess(0) -# else -# define PNG_ABORT() abort() -# endif +#if CHAR_BIT == 8 && UCHAR_MAX == 255 + typedef unsigned char png_byte; +#else +# error "libpng requires 8 bit bytes" #endif -#ifdef USE_FAR_KEYWORD -/* Use this to make far-to-near assignments */ -# define CHECK 1 -# define NOCHECK 0 -# define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK)) -# define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK)) -# define png_strcpy _fstrcpy -# define png_strncpy _fstrncpy /* Added to v 1.2.6 */ -# define png_strlen _fstrlen -# define png_memcmp _fmemcmp /* SJT: added */ -# define png_memcpy _fmemcpy -# define png_memset _fmemset -# define png_sprintf sprintf +#if INT_MIN == -32768 && INT_MAX == 32767 + typedef int png_int_16; +#elif SHRT_MIN == -32768 && SHRT_MAX == 32767 + typedef short png_int_16; #else -# if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) -# /* Favor Windows over C runtime fns */ -# define CVT_PTR(ptr) (ptr) -# define CVT_PTR_NOCHECK(ptr) (ptr) -# define png_strcpy lstrcpyA -# define png_strncpy lstrcpynA -# define png_strlen lstrlenA -# define png_memcmp memcmp -# define png_memcpy CopyMemory -# define png_memset memset -# define png_sprintf wsprintfA -# else -# define CVT_PTR(ptr) (ptr) -# define CVT_PTR_NOCHECK(ptr) (ptr) -# define png_strcpy strcpy -# define png_strncpy strncpy /* Added to v 1.2.6 */ -# define png_strlen strlen -# define png_memcmp memcmp /* SJT: added */ -# define png_memcpy memcpy -# define png_memset memset -# define png_sprintf sprintf -# endif +# error "libpng requires a signed 16 bit type" #endif -#ifndef PNG_NO_SNPRINTF -# ifdef _MSC_VER -# define png_snprintf _snprintf /* Added to v 1.2.19 */ -# define png_snprintf2 _snprintf -# define png_snprintf6 _snprintf -# else -# define png_snprintf snprintf /* Added to v 1.2.19 */ -# define png_snprintf2 snprintf -# define png_snprintf6 snprintf -# endif +#if UINT_MAX == 65535 + typedef unsigned int png_uint_16; +#elif USHRT_MAX == 65535 + typedef unsigned short png_uint_16; #else - /* You don't have or don't want to use snprintf(). Caution: Using - * sprintf instead of snprintf exposes your application to accidental - * or malevolent buffer overflows. If you don't have snprintf() - * as a general rule you should provide one (you can get one from - * Portable OpenSSH). +# error "libpng requires an unsigned 16 bit type" +#endif + +#if INT_MIN < -2147483646 && INT_MAX > 2147483646 + typedef int png_int_32; +#elif LONG_MIN < -2147483646 && LONG_MAX > 2147483646 + typedef long int png_int_32; +#else +# error "libpng requires a signed 32 bit (or more) type" +#endif + +#if UINT_MAX > 4294967294 + typedef unsigned int png_uint_32; +#elif ULONG_MAX > 4294967294 + typedef unsigned long int png_uint_32; +#else +# error "libpng requires an unsigned 32 bit (or more) type" +#endif + +/* Prior to 1.6.0 it was possible to disable the use of size_t, 1.6.0, however, + * requires an ISOC90 compiler and relies on consistent behavior of sizeof. + */ +typedef size_t png_size_t; +typedef ptrdiff_t png_ptrdiff_t; + +/* libpng needs to know the maximum value of 'size_t' and this controls the + * definition of png_alloc_size_t, below. This maximum value of size_t limits + * but does not control the maximum allocations the library makes - there is + * direct application control of this through png_set_user_limits(). + */ +#ifndef PNG_SMALL_SIZE_T + /* Compiler specific tests for systems where size_t is known to be less than + * 32 bits (some of these systems may no longer work because of the lack of + * 'far' support; see above.) */ -# define png_snprintf(s1,n,fmt,x1) png_sprintf(s1,fmt,x1) -# define png_snprintf2(s1,n,fmt,x1,x2) png_sprintf(s1,fmt,x1,x2) -# define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \ - png_sprintf(s1,fmt,x1,x2,x3,x4,x5,x6) -#endif - -/* png_alloc_size_t is guaranteed to be no smaller than png_size_t, - * and no smaller than png_uint_32. Casts from png_size_t or png_uint_32 - * to png_alloc_size_t are not necessary; in fact, it is recommended - * not to use them at all so that the compiler can complain when something - * turns out to be problematic. - * Casts in the other direction (from png_alloc_size_t to png_size_t or - * png_uint_32) should be explicitly applied; however, we do not expect - * to encounter practical situations that require such conversions. - */ -#if defined(__TURBOC__) && !defined(__FLAT__) - typedef unsigned long png_alloc_size_t; -#else -# if defined(_MSC_VER) && defined(MAXSEG_64K) - typedef unsigned long png_alloc_size_t; -# else - /* This is an attempt to detect an old Windows system where (int) is - * actually 16 bits, in that case png_malloc must have an argument with a - * bigger size to accomodate the requirements of the library. - */ -# if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) && \ - (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL) - typedef DWORD png_alloc_size_t; -# else - typedef png_size_t png_alloc_size_t; -# endif +# if (defined(__TURBOC__) && !defined(__FLAT__)) ||\ + (defined(_MSC_VER) && defined(MAXSEG_64K)) +# define PNG_SMALL_SIZE_T # endif #endif -/* End of memory model/platform independent support */ -/* Just a little check that someone hasn't tried to define something - * contradictory. +/* png_alloc_size_t is guaranteed to be no smaller than png_size_t, and no + * smaller than png_uint_32. Casts from png_size_t or png_uint_32 to + * png_alloc_size_t are not necessary; in fact, it is recommended not to use + * them at all so that the compiler can complain when something turns out to be + * problematic. + * + * Casts in the other direction (from png_alloc_size_t to png_size_t or + * png_uint_32) should be explicitly applied; however, we do not expect to + * encounter practical situations that require such conversions. + * + * PNG_SMALL_SIZE_T must be defined if the maximum value of size_t is less than + * 4294967295 - i.e. less than the maximum value of png_uint_32. */ -#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) -# undef PNG_ZBUF_SIZE -# define PNG_ZBUF_SIZE 65536L +#ifdef PNG_SMALL_SIZE_T + typedef png_uint_32 png_alloc_size_t; +#else + typedef png_size_t png_alloc_size_t; #endif +/* Prior to 1.6.0 libpng offered limited support for Microsoft C compiler + * implementations of Intel CPU specific support of user-mode segmented address + * spaces, where 16-bit pointers address more than 65536 bytes of memory using + * separate 'segment' registers. The implementation requires two different + * types of pointer (only one of which includes the segment value.) + * + * If required this support is available in version 1.2 of libpng and may be + * available in versions through 1.5, although the correctness of the code has + * not been verified recently. + */ -/* Added at libpng-1.2.8 */ -#endif /* PNG_VERSION_INFO_ONLY */ +/* Typedef for floating-point numbers that are converted to fixed-point with a + * multiple of 100,000, e.g., gamma + */ +typedef png_int_32 png_fixed_point; + +/* Add typedefs for pointers */ +typedef void * png_voidp; +typedef const void * png_const_voidp; +typedef png_byte * png_bytep; +typedef const png_byte * png_const_bytep; +typedef png_uint_32 * png_uint_32p; +typedef const png_uint_32 * png_const_uint_32p; +typedef png_int_32 * png_int_32p; +typedef const png_int_32 * png_const_int_32p; +typedef png_uint_16 * png_uint_16p; +typedef const png_uint_16 * png_const_uint_16p; +typedef png_int_16 * png_int_16p; +typedef const png_int_16 * png_const_int_16p; +typedef char * png_charp; +typedef const char * png_const_charp; +typedef png_fixed_point * png_fixed_point_p; +typedef const png_fixed_point * png_const_fixed_point_p; +typedef png_size_t * png_size_tp; +typedef const png_size_t * png_const_size_tp; + +#ifdef PNG_STDIO_SUPPORTED +typedef FILE * png_FILE_p; +#endif + +#ifdef PNG_FLOATING_POINT_SUPPORTED +typedef double * png_doublep; +typedef const double * png_const_doublep; +#endif + +/* Pointers to pointers; i.e. arrays */ +typedef png_byte * * png_bytepp; +typedef png_uint_32 * * png_uint_32pp; +typedef png_int_32 * * png_int_32pp; +typedef png_uint_16 * * png_uint_16pp; +typedef png_int_16 * * png_int_16pp; +typedef const char * * png_const_charpp; +typedef char * * png_charpp; +typedef png_fixed_point * * png_fixed_point_pp; +#ifdef PNG_FLOATING_POINT_SUPPORTED +typedef double * * png_doublepp; +#endif + +/* Pointers to pointers to pointers; i.e., pointer to array */ +typedef char * * * png_charppp; + +#endif /* PNG_BUILDING_SYMBOL_TABLE */ #endif /* PNGCONF_H */ diff --git a/project/jni/png/png.c b/project/jni/png/png.c index fb241c02b..050039548 100644 --- a/project/jni/png/png.c +++ b/project/jni/png/png.c @@ -1,8 +1,8 @@ /* png.c - location for general purpose libpng functions * - * Last changed in libpng 1.4.6 [January 23, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.2 [April 25, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -11,13 +11,10 @@ * and license in png.h */ -#define PNG_NO_EXTERN -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" #include "pngpriv.h" /* Generate a compiler error if there is an old png.h in the search path. */ -typedef version_1_4_6beta06 Your_png_h_is_not_version_1_4_6beta06; +typedef png_libpng_version_1_6_6 Your_png_h_is_not_version_1_6_6; /* Tells libpng that we have already handled the first "num_bytes" bytes * of the PNG file signature. If the PNG data is embedded into another @@ -27,7 +24,7 @@ typedef version_1_4_6beta06 Your_png_h_is_not_version_1_4_6beta06; #ifdef PNG_READ_SUPPORTED void PNGAPI -png_set_sig_bytes(png_structp png_ptr, int num_bytes) +png_set_sig_bytes(png_structrp png_ptr, int num_bytes) { png_debug(1, "in png_set_sig_bytes"); @@ -46,14 +43,16 @@ png_set_sig_bytes(png_structp png_ptr, int num_bytes) * can simply check the remaining bytes for extra assurance. Returns * an integer less than, equal to, or greater than zero if sig is found, * respectively, to be less than, to match, or be greater than the correct - * PNG signature (this is the same behaviour as strcmp, memcmp, etc). + * PNG signature (this is the same behavior as strcmp, memcmp, etc). */ int PNGAPI -png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check) +png_sig_cmp(png_const_bytep sig, png_size_t start, png_size_t num_to_check) { png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; + if (num_to_check > 8) num_to_check = 8; + else if (num_to_check < 1) return (-1); @@ -63,51 +62,47 @@ png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check) if (start + num_to_check > 8) num_to_check = 8 - start; - return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check))); + return ((int)(memcmp(&sig[start], &png_signature[start], num_to_check))); } #endif /* PNG_READ_SUPPORTED */ #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) -/* Function to allocate memory for zlib and clear it to 0. */ -voidpf /* PRIVATE */ -png_zalloc(voidpf png_ptr, uInt items, uInt size) +/* Function to allocate memory for zlib */ +PNG_FUNCTION(voidpf /* PRIVATE */, +png_zalloc,(voidpf png_ptr, uInt items, uInt size),PNG_ALLOCATED) { - png_voidp ptr; - png_structp p=(png_structp)png_ptr; - png_uint_32 save_flags=p->flags; - png_alloc_size_t num_bytes; + png_alloc_size_t num_bytes = size; if (png_ptr == NULL) - return (NULL); - if (items > PNG_UINT_32_MAX/size) + return NULL; + + if (items >= (~(png_alloc_size_t)0)/size) { - png_warning (p, "Potential overflow in png_zalloc()"); - return (NULL); + png_warning (png_voidcast(png_structrp, png_ptr), + "Potential overflow in png_zalloc()"); + return NULL; } - num_bytes = (png_alloc_size_t)items * size; - p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK; - ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes); - p->flags=save_flags; - - return ((voidpf)ptr); + num_bytes *= items; + return png_malloc_warn(png_voidcast(png_structrp, png_ptr), num_bytes); } /* Function to free memory for zlib */ void /* PRIVATE */ png_zfree(voidpf png_ptr, voidpf ptr) { - png_free((png_structp)png_ptr, (png_voidp)ptr); + png_free(png_voidcast(png_const_structrp,png_ptr), ptr); } /* Reset the CRC variable to 32 bits of 1's. Care must be taken * in case CRC is > 32 bits to leave the top bits 0. */ void /* PRIVATE */ -png_reset_crc(png_structp png_ptr) +png_reset_crc(png_structrp png_ptr) { - png_ptr->crc = crc32(0, Z_NULL, 0); + /* The cast is safe because the crc is a 32 bit value. */ + png_ptr->crc = (png_uint_32)crc32(0, Z_NULL, 0); } /* Calculate the CRC over a section of data. We can only pass as @@ -116,63 +111,251 @@ png_reset_crc(png_structp png_ptr) * trouble of calculating it. */ void /* PRIVATE */ -png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length) +png_calculate_crc(png_structrp png_ptr, png_const_bytep ptr, png_size_t length) { int need_crc = 1; - if (png_ptr->chunk_name[0] & 0x20) /* ancillary */ + if (PNG_CHUNK_ANCILLARY(png_ptr->chunk_name)) { if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) == (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN)) need_crc = 0; } - else /* critical */ + + else /* critical */ { if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) need_crc = 0; } - if (need_crc) - png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length); + /* 'uLong' is defined in zlib.h as unsigned long; this means that on some + * systems it is a 64 bit value. crc32, however, returns 32 bits so the + * following cast is safe. 'uInt' may be no more than 16 bits, so it is + * necessary to perform a loop here. + */ + if (need_crc && length > 0) + { + uLong crc = png_ptr->crc; /* Should never issue a warning */ + + do + { + uInt safe_length = (uInt)length; + if (safe_length == 0) + safe_length = (uInt)-1; /* evil, but safe */ + + crc = crc32(crc, ptr, safe_length); + + /* The following should never issue compiler warnings; if they do the + * target system has characteristics that will probably violate other + * assumptions within the libpng code. + */ + ptr += safe_length; + length -= safe_length; + } + while (length > 0); + + /* And the following is always safe because the crc is only 32 bits. */ + png_ptr->crc = (png_uint_32)crc; + } } -/* Allocate the memory for an info_struct for the application. We don't - * really need the png_ptr, but it could potentially be useful in the - * future. This should be used in favour of malloc(png_sizeof(png_info)) - * and png_info_init() so that applications that want to use a shared - * libpng don't have to be recompiled if png_info changes size. +/* Check a user supplied version number, called from both read and write + * functions that create a png_struct. */ -png_infop PNGAPI -png_create_info_struct(png_structp png_ptr) +int +png_user_version_check(png_structrp png_ptr, png_const_charp user_png_ver) { - png_infop info_ptr; + if (user_png_ver) + { + int i = 0; + + do + { + if (user_png_ver[i] != png_libpng_ver[i]) + png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; + } while (png_libpng_ver[i++]); + } + + else + png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; + + if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) + { + /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so + * we must recompile any applications that use any older library version. + * For versions after libpng 1.0, we will be compatible, so we need + * only check the first and third digits (note that when we reach version + * 1.10 we will need to check the fourth symbol, namely user_png_ver[3]). + */ + if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || + (user_png_ver[0] == '1' && (user_png_ver[2] != png_libpng_ver[2] || + user_png_ver[3] != png_libpng_ver[3])) || + (user_png_ver[0] == '0' && user_png_ver[2] < '9')) + { +#ifdef PNG_WARNINGS_SUPPORTED + size_t pos = 0; + char m[128]; + + pos = png_safecat(m, (sizeof m), pos, + "Application built with libpng-"); + pos = png_safecat(m, (sizeof m), pos, user_png_ver); + pos = png_safecat(m, (sizeof m), pos, " but running with "); + pos = png_safecat(m, (sizeof m), pos, png_libpng_ver); + + png_warning(png_ptr, m); +#endif + +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + png_ptr->flags = 0; +#endif + + return 0; + } + } + + /* Success return. */ + return 1; +} + +/* Generic function to create a png_struct for either read or write - this + * contains the common initialization. + */ +PNG_FUNCTION(png_structp /* PRIVATE */, +png_create_png_struct,(png_const_charp user_png_ver, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, + png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED) +{ + png_struct create_struct; +# ifdef PNG_SETJMP_SUPPORTED + jmp_buf create_jmp_buf; +# endif + + /* This temporary stack-allocated structure is used to provide a place to + * build enough context to allow the user provided memory allocator (if any) + * to be called. + */ + memset(&create_struct, 0, (sizeof create_struct)); + + /* Added at libpng-1.2.6 */ +# ifdef PNG_USER_LIMITS_SUPPORTED + create_struct.user_width_max = PNG_USER_WIDTH_MAX; + create_struct.user_height_max = PNG_USER_HEIGHT_MAX; + +# ifdef PNG_USER_CHUNK_CACHE_MAX + /* Added at libpng-1.2.43 and 1.4.0 */ + create_struct.user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX; +# endif + +# ifdef PNG_USER_CHUNK_MALLOC_MAX + /* Added at libpng-1.2.43 and 1.4.1, required only for read but exists + * in png_struct regardless. + */ + create_struct.user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX; +# endif +# endif + + /* The following two API calls simply set fields in png_struct, so it is safe + * to do them now even though error handling is not yet set up. + */ +# ifdef PNG_USER_MEM_SUPPORTED + png_set_mem_fn(&create_struct, mem_ptr, malloc_fn, free_fn); +# endif + + /* (*error_fn) can return control to the caller after the error_ptr is set, + * this will result in a memory leak unless the error_fn does something + * extremely sophisticated. The design lacks merit but is implicit in the + * API. + */ + png_set_error_fn(&create_struct, error_ptr, error_fn, warn_fn); + +# ifdef PNG_SETJMP_SUPPORTED + if (!setjmp(create_jmp_buf)) + { + /* Temporarily fake out the longjmp information until we have + * successfully completed this function. This only works if we have + * setjmp() support compiled in, but it is safe - this stuff should + * never happen. + */ + create_struct.jmp_buf_ptr = &create_jmp_buf; + create_struct.jmp_buf_size = 0; /*stack allocation*/ + create_struct.longjmp_fn = longjmp; +# else + { +# endif + /* Call the general version checker (shared with read and write code): + */ + if (png_user_version_check(&create_struct, user_png_ver)) + { + png_structrp png_ptr = png_voidcast(png_structrp, + png_malloc_warn(&create_struct, (sizeof *png_ptr))); + + if (png_ptr != NULL) + { + /* png_ptr->zstream holds a back-pointer to the png_struct, so + * this can only be done now: + */ + create_struct.zstream.zalloc = png_zalloc; + create_struct.zstream.zfree = png_zfree; + create_struct.zstream.opaque = png_ptr; + +# ifdef PNG_SETJMP_SUPPORTED + /* Eliminate the local error handling: */ + create_struct.jmp_buf_ptr = NULL; + create_struct.jmp_buf_size = 0; + create_struct.longjmp_fn = 0; +# endif + + *png_ptr = create_struct; + + /* This is the successful return point */ + return png_ptr; + } + } + } + + /* A longjmp because of a bug in the application storage allocator or a + * simple failure to allocate the png_struct. + */ + return NULL; +} + +/* Allocate the memory for an info_struct for the application. */ +PNG_FUNCTION(png_infop,PNGAPI +png_create_info_struct,(png_const_structrp png_ptr),PNG_ALLOCATED) +{ + png_inforp info_ptr; png_debug(1, "in png_create_info_struct"); if (png_ptr == NULL) - return (NULL); + return NULL; + + /* Use the internal API that does not (or at least should not) error out, so + * that this call always returns ok. The application typically sets up the + * error handling *after* creating the info_struct because this is the way it + * has always been done in 'example.c'. + */ + info_ptr = png_voidcast(png_inforp, png_malloc_base(png_ptr, + (sizeof *info_ptr))); -#ifdef PNG_USER_MEM_SUPPORTED - info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO, - png_ptr->malloc_fn, png_ptr->mem_ptr); -#else - info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); -#endif if (info_ptr != NULL) - png_info_init_3(&info_ptr, png_sizeof(png_info)); + memset(info_ptr, 0, (sizeof *info_ptr)); - return (info_ptr); + return info_ptr; } /* This function frees the memory associated with a single info struct. * Normally, one would use either png_destroy_read_struct() or * png_destroy_write_struct() to free an info struct, but this may be - * useful for some applications. + * useful for some applications. From libpng 1.6.0 this function is also used + * internally to implement the png_info release part of the 'struct' destroy + * APIs. This ensures that all possible approaches free the same data (all of + * it). */ void PNGAPI -png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) +png_destroy_info_struct(png_const_structrp png_ptr, png_infopp info_ptr_ptr) { - png_infop info_ptr = NULL; + png_inforp info_ptr = NULL; png_debug(1, "in png_destroy_info_struct"); @@ -184,46 +367,57 @@ png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) if (info_ptr != NULL) { - png_info_destroy(png_ptr, info_ptr); - -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn, - png_ptr->mem_ptr); -#else - png_destroy_struct((png_voidp)info_ptr); -#endif + /* Do this first in case of an error below; if the app implements its own + * memory management this can lead to png_free calling png_error, which + * will abort this routine and return control to the app error handler. + * An infinite loop may result if it then tries to free the same info + * ptr. + */ *info_ptr_ptr = NULL; + + png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); + memset(info_ptr, 0, (sizeof *info_ptr)); + png_free(png_ptr, info_ptr); } } /* Initialize the info structure. This is now an internal function (0.89) * and applications using it are urged to use png_create_info_struct() - * instead. + * instead. Use deprecated in 1.6.0, internal use removed (used internally it + * is just a memset). + * + * NOTE: it is almost inconceivable that this API is used because it bypasses + * the user-memory mechanism and the user error handling/warning mechanisms in + * those cases where it does anything other than a memset. */ - -void PNGAPI -png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size) +PNG_FUNCTION(void,PNGAPI +png_info_init_3,(png_infopp ptr_ptr, png_size_t png_info_struct_size), + PNG_DEPRECATED) { - png_infop info_ptr = *ptr_ptr; + png_inforp info_ptr = *ptr_ptr; png_debug(1, "in png_info_init_3"); if (info_ptr == NULL) return; - if (png_sizeof(png_info) > png_info_struct_size) + if ((sizeof (png_info)) > png_info_struct_size) { - png_destroy_struct(info_ptr); - info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); + *ptr_ptr = NULL; + /* The following line is why this API should not be used: */ + free(info_ptr); + info_ptr = png_voidcast(png_inforp, png_malloc_base(NULL, + (sizeof *info_ptr))); *ptr_ptr = info_ptr; } /* Set everything to 0 */ - png_memset(info_ptr, 0, png_sizeof(png_info)); + memset(info_ptr, 0, (sizeof *info_ptr)); } +/* The following API is not called internally */ void PNGAPI -png_data_freer(png_structp png_ptr, png_infop info_ptr, +png_data_freer(png_const_structrp png_ptr, png_inforp info_ptr, int freer, png_uint_32 mask) { png_debug(1, "in png_data_freer"); @@ -233,15 +427,16 @@ png_data_freer(png_structp png_ptr, png_infop info_ptr, if (freer == PNG_DESTROY_WILL_FREE_DATA) info_ptr->free_me |= mask; + else if (freer == PNG_USER_WILL_FREE_DATA) info_ptr->free_me &= ~mask; + else - png_warning(png_ptr, - "Unknown freer parameter in png_data_freer"); + png_error(png_ptr, "Unknown freer parameter in png_data_freer"); } void PNGAPI -png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, +png_free_data(png_const_structrp png_ptr, png_inforp info_ptr, png_uint_32 mask, int num) { png_debug(1, "in png_free_data"); @@ -261,6 +456,7 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, info_ptr->text[num].key = NULL; } } + else { int i; @@ -287,12 +483,10 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, /* Free any sCAL entry */ if ((mask & PNG_FREE_SCAL) & info_ptr->free_me) { -#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) png_free(png_ptr, info_ptr->scal_s_width); png_free(png_ptr, info_ptr->scal_s_height); info_ptr->scal_s_width = NULL; info_ptr->scal_s_height = NULL; -#endif info_ptr->valid &= ~PNG_INFO_sCAL; } #endif @@ -307,8 +501,8 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, info_ptr->pcal_units = NULL; if (info_ptr->pcal_params != NULL) { - int i; - for (i = 0; i < (int)info_ptr->pcal_nparams; i++) + unsigned int i; + for (i = 0; i < info_ptr->pcal_nparams; i++) { png_free(png_ptr, info_ptr->pcal_params[i]); info_ptr->pcal_params[i] = NULL; @@ -321,7 +515,7 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, #endif #ifdef PNG_iCCP_SUPPORTED - /* Free any iCCP entry */ + /* Free any profile entry */ if ((mask & PNG_FREE_ICCP) & info_ptr->free_me) { png_free(png_ptr, info_ptr->iccp_name); @@ -346,13 +540,14 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, info_ptr->splt_palettes[num].entries = NULL; } } + else { if (info_ptr->splt_palettes_num) { int i; - for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) - png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i); + for (i = 0; i < info_ptr->splt_palettes_num; i++) + png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, (int)i); png_free(png_ptr, info_ptr->splt_palettes); info_ptr->splt_palettes = NULL; @@ -363,13 +558,7 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, } #endif -#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED - if (png_ptr->unknown_chunk.data) - { - png_free(png_ptr, png_ptr->unknown_chunk.data); - png_ptr->unknown_chunk.data = NULL; - } - +#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED if ((mask & PNG_FREE_UNKN) & info_ptr->free_me) { if (num != -1) @@ -380,14 +569,15 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, info_ptr->unknown_chunks[num].data = NULL; } } + else { int i; if (info_ptr->unknown_chunks_num) { - for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++) - png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i); + for (i = 0; i < info_ptr->unknown_chunks_num; i++) + png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, (int)i); png_free(png_ptr, info_ptr->unknown_chunks); info_ptr->unknown_chunks = NULL; @@ -410,7 +600,7 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, /* Free any PLTE entry that was internally allocated */ if ((mask & PNG_FREE_PLTE) & info_ptr->free_me) { - png_zfree(png_ptr, info_ptr->palette); + png_free(png_ptr, info_ptr->palette); info_ptr->palette = NULL; info_ptr->valid &= ~PNG_INFO_PLTE; info_ptr->num_palette = 0; @@ -422,8 +612,8 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, { if (info_ptr->row_pointers) { - int row; - for (row = 0; row < (int)info_ptr->height; row++) + png_uint_32 row; + for (row = 0; row < info_ptr->height; row++) { png_free(png_ptr, info_ptr->row_pointers[row]); info_ptr->row_pointers[row] = NULL; @@ -435,33 +625,10 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, } #endif - if (num == -1) - info_ptr->free_me &= ~mask; - else - info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL); -} + if (num != -1) + mask &= ~PNG_FREE_MUL; -/* This is an internal routine to free any memory that the info struct is - * pointing to before re-using it or freeing the struct itself. Recall - * that png_free() checks for NULL pointers for us. - */ -void /* PRIVATE */ -png_info_destroy(png_structp png_ptr, png_infop info_ptr) -{ - png_debug(1, "in png_info_destroy"); - - png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); - -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - if (png_ptr->num_chunk_list) - { - png_free(png_ptr, png_ptr->chunk_list); - png_ptr->chunk_list = NULL; - png_ptr->num_chunk_list = 0; - } -#endif - - png_info_init_3(&info_ptr, png_sizeof(png_info)); + info_ptr->free_me &= ~mask; } #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ @@ -470,23 +637,24 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr) * pointer before png_write_destroy() or png_read_destroy() are called. */ png_voidp PNGAPI -png_get_io_ptr(png_structp png_ptr) +png_get_io_ptr(png_const_structrp png_ptr) { if (png_ptr == NULL) return (NULL); + return (png_ptr->io_ptr); } #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) -#ifdef PNG_STDIO_SUPPORTED +# ifdef PNG_STDIO_SUPPORTED /* Initialize the default input/output functions for the PNG file. If you * use your own read or write routines, you can call either png_set_read_fn() * or png_set_write_fn() instead of png_init_io(). If you have defined - * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't - * necessarily available. + * PNG_NO_STDIO or otherwise disabled PNG_STDIO_SUPPORTED, you must use a + * function of your own because "FILE *" isn't necessarily available. */ void PNGAPI -png_init_io(png_structp png_ptr, png_FILE_p fp) +png_init_io(png_structrp png_ptr, png_FILE_p fp) { png_debug(1, "in png_init_io"); @@ -495,69 +663,122 @@ png_init_io(png_structp png_ptr, png_FILE_p fp) png_ptr->io_ptr = (png_voidp)fp; } +# endif + +#ifdef PNG_SAVE_INT_32_SUPPORTED +/* The png_save_int_32 function assumes integers are stored in two's + * complement format. If this isn't the case, then this routine needs to + * be modified to write data in two's complement format. Note that, + * the following works correctly even if png_int_32 has more than 32 bits + * (compare the more complex code required on read for sign extension.) + */ +void PNGAPI +png_save_int_32(png_bytep buf, png_int_32 i) +{ + buf[0] = (png_byte)((i >> 24) & 0xff); + buf[1] = (png_byte)((i >> 16) & 0xff); + buf[2] = (png_byte)((i >> 8) & 0xff); + buf[3] = (png_byte)(i & 0xff); +} #endif -#ifdef PNG_TIME_RFC1123_SUPPORTED +# ifdef PNG_TIME_RFC1123_SUPPORTED /* Convert the supplied time into an RFC 1123 string suitable for use in * a "Creation Time" or other text-based time string. */ -png_charp PNGAPI -png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime) +int PNGAPI +png_convert_to_rfc1123_buffer(char out[29], png_const_timep ptime) { static PNG_CONST char short_months[12][4] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; - if (png_ptr == NULL) - return (NULL); - if (png_ptr->time_buffer == NULL) + if (out == NULL) + return 0; + + if (ptime->year > 9999 /* RFC1123 limitation */ || + ptime->month == 0 || ptime->month > 12 || + ptime->day == 0 || ptime->day > 31 || + ptime->hour > 23 || ptime->minute > 59 || + ptime->second > 60) + return 0; + { - png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29* - png_sizeof(char))); + size_t pos = 0; + char number_buf[5]; /* enough for a four-digit year */ + +# define APPEND_STRING(string) pos = png_safecat(out, 29, pos, (string)) +# define APPEND_NUMBER(format, value)\ + APPEND_STRING(PNG_FORMAT_NUMBER(number_buf, format, (value))) +# define APPEND(ch) if (pos < 28) out[pos++] = (ch) + + APPEND_NUMBER(PNG_NUMBER_FORMAT_u, (unsigned)ptime->day); + APPEND(' '); + APPEND_STRING(short_months[(ptime->month - 1)]); + APPEND(' '); + APPEND_NUMBER(PNG_NUMBER_FORMAT_u, ptime->year); + APPEND(' '); + APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->hour); + APPEND(':'); + APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->minute); + APPEND(':'); + APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->second); + APPEND_STRING(" +0000"); /* This reliably terminates the buffer */ + +# undef APPEND +# undef APPEND_NUMBER +# undef APPEND_STRING } -#ifdef USE_FAR_KEYWORD - { - char near_time_buf[29]; - png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000", - ptime->day % 32, short_months[(ptime->month - 1) % 12], - ptime->year, ptime->hour % 24, ptime->minute % 60, - ptime->second % 61); - png_memcpy(png_ptr->time_buffer, near_time_buf, - 29*png_sizeof(char)); - } -#else - png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000", - ptime->day % 32, short_months[(ptime->month - 1) % 12], - ptime->year, ptime->hour % 24, ptime->minute % 60, - ptime->second % 61); -#endif - return ((png_charp)png_ptr->time_buffer); + return 1; } -#endif /* PNG_TIME_RFC1123_SUPPORTED */ + +# if PNG_LIBPNG_VER < 10700 +/* To do: remove the following from libpng-1.7 */ +/* Original API that uses a private buffer in png_struct. + * Deprecated because it causes png_struct to carry a spurious temporary + * buffer (png_struct::time_buffer), better to have the caller pass this in. + */ +png_const_charp PNGAPI +png_convert_to_rfc1123(png_structrp png_ptr, png_const_timep ptime) +{ + if (png_ptr != NULL) + { + /* The only failure above if png_ptr != NULL is from an invalid ptime */ + if (!png_convert_to_rfc1123_buffer(png_ptr->time_buffer, ptime)) + png_warning(png_ptr, "Ignoring invalid time value"); + + else + return png_ptr->time_buffer; + } + + return NULL; +} +# endif +# endif /* PNG_TIME_RFC1123_SUPPORTED */ #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ -png_charp PNGAPI -png_get_copyright(png_const_structp png_ptr) +png_const_charp PNGAPI +png_get_copyright(png_const_structrp png_ptr) { - png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */ + PNG_UNUSED(png_ptr) /* Silence compiler warning about unused png_ptr */ #ifdef PNG_STRING_COPYRIGHT - return PNG_STRING_COPYRIGHT + return PNG_STRING_COPYRIGHT #else -#ifdef __STDC__ - return ((png_charp) PNG_STRING_NEWLINE \ - "libpng version 1.4.6beta06 - January 23, 2011" PNG_STRING_NEWLINE \ - "Copyright (c) 1998-2010 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \ +# ifdef __STDC__ + return PNG_STRING_NEWLINE \ + "libpng version 1.6.6 - September 16, 2013" PNG_STRING_NEWLINE \ + "Copyright (c) 1998-2013 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \ "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \ "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \ - PNG_STRING_NEWLINE); -#else - return ((png_charp) "libpng version 1.4.6beta06 - January 23, 2011\ - Copyright (c) 1998-2010 Glenn Randers-Pehrson\ + PNG_STRING_NEWLINE; +# else + return "libpng version 1.6.6 - September 16, 2013\ + Copyright (c) 1998-2013 Glenn Randers-Pehrson\ Copyright (c) 1996-1997 Andreas Dilger\ - Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc."); -#endif + Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc."; +# endif #endif } @@ -569,64 +790,92 @@ png_get_copyright(png_const_structp png_ptr) * png_get_header_ver(). Due to the version_nn_nn_nn typedef guard, * it is guaranteed that png.c uses the correct version of png.h. */ -png_charp PNGAPI -png_get_libpng_ver(png_const_structp png_ptr) +png_const_charp PNGAPI +png_get_libpng_ver(png_const_structrp png_ptr) { /* Version of *.c files used when building libpng */ - png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */ - return ((png_charp) PNG_LIBPNG_VER_STRING); + return png_get_header_ver(png_ptr); } -png_charp PNGAPI -png_get_header_ver(png_const_structp png_ptr) +png_const_charp PNGAPI +png_get_header_ver(png_const_structrp png_ptr) { /* Version of *.h files used when building libpng */ - png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */ - return ((png_charp) PNG_LIBPNG_VER_STRING); + PNG_UNUSED(png_ptr) /* Silence compiler warning about unused png_ptr */ + return PNG_LIBPNG_VER_STRING; } -png_charp PNGAPI -png_get_header_version(png_const_structp png_ptr) +png_const_charp PNGAPI +png_get_header_version(png_const_structrp png_ptr) { /* Returns longer string containing both version and date */ - png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */ + PNG_UNUSED(png_ptr) /* Silence compiler warning about unused png_ptr */ #ifdef __STDC__ - return ((png_charp) PNG_HEADER_VERSION_STRING -#ifndef PNG_READ_SUPPORTED + return PNG_HEADER_VERSION_STRING +# ifndef PNG_READ_SUPPORTED " (NO READ SUPPORT)" -#endif - PNG_STRING_NEWLINE); +# endif + PNG_STRING_NEWLINE; #else - return ((png_charp) PNG_HEADER_VERSION_STRING); + return PNG_HEADER_VERSION_STRING; #endif } -#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED +#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED int PNGAPI -png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name) +png_handle_as_unknown(png_const_structrp png_ptr, png_const_bytep chunk_name) { /* Check chunk_name and return "keep" value if it's on the list, else 0 */ - int i; - png_bytep p; - if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0) - return 0; - p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5; - for (i = png_ptr->num_chunk_list; i; i--, p -= 5) - if (!png_memcmp(chunk_name, p, 4)) - return ((int)*(p + 4)); - return 0; + png_const_bytep p, p_end; + + if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list == 0) + return PNG_HANDLE_CHUNK_AS_DEFAULT; + + p_end = png_ptr->chunk_list; + p = p_end + png_ptr->num_chunk_list*5; /* beyond end */ + + /* The code is the fifth byte after each four byte string. Historically this + * code was always searched from the end of the list, this is no longer + * necessary because the 'set' routine handles duplicate entries correcty. + */ + do /* num_chunk_list > 0, so at least one */ + { + p -= 5; + + if (!memcmp(chunk_name, p, 4)) + return p[4]; + } + while (p > p_end); + + /* This means that known chunks should be processed and unknown chunks should + * be handled according to the value of png_ptr->unknown_default; this can be + * confusing because, as a result, there are two levels of defaulting for + * unknown chunks. + */ + return PNG_HANDLE_CHUNK_AS_DEFAULT; } -#endif -#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ + +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED +int /* PRIVATE */ +png_chunk_unknown_handling(png_const_structrp png_ptr, png_uint_32 chunk_name) +{ + png_byte chunk_string[5]; + + PNG_CSTRING_FROM_CHUNK(chunk_string, chunk_name); + return png_handle_as_unknown(png_ptr, chunk_string); +} +#endif /* HANDLE_AS_UNKNOWN */ +#endif /* SET_UNKNOWN_CHUNKS */ #ifdef PNG_READ_SUPPORTED /* This function, added to libpng-1.0.6g, is untested. */ int PNGAPI -png_reset_zstream(png_structp png_ptr) +png_reset_zstream(png_structrp png_ptr) { if (png_ptr == NULL) return Z_STREAM_ERROR; + + /* WARNING: this resets the window bits to the maximum! */ return (inflateReset(&png_ptr->zstream)); } #endif /* PNG_READ_SUPPORTED */ @@ -636,142 +885,1478 @@ png_uint_32 PNGAPI png_access_version_number(void) { /* Version of *.c files used when building libpng */ - return((png_uint_32) PNG_LIBPNG_VER); + return((png_uint_32)PNG_LIBPNG_VER); } #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) -#ifdef PNG_SIZE_T -/* Added at libpng version 1.2.6 */ - PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); -png_size_t PNGAPI -png_convert_size(size_t size) +/* Ensure that png_ptr->zstream.msg holds some appropriate error message string. + * If it doesn't 'ret' is used to set it to something appropriate, even in cases + * like Z_OK or Z_STREAM_END where the error code is apparently a success code. + */ +void /* PRIVATE */ +png_zstream_error(png_structrp png_ptr, int ret) { - if (size > (png_size_t)-1) - PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */ - return ((png_size_t)size); + /* Translate 'ret' into an appropriate error string, priority is given to the + * one in zstream if set. This always returns a string, even in cases like + * Z_OK or Z_STREAM_END where the error code is a success code. + */ + if (png_ptr->zstream.msg == NULL) switch (ret) + { + default: + case Z_OK: + png_ptr->zstream.msg = PNGZ_MSG_CAST("unexpected zlib return code"); + break; + + case Z_STREAM_END: + /* Normal exit */ + png_ptr->zstream.msg = PNGZ_MSG_CAST("unexpected end of LZ stream"); + break; + + case Z_NEED_DICT: + /* This means the deflate stream did not have a dictionary; this + * indicates a bogus PNG. + */ + png_ptr->zstream.msg = PNGZ_MSG_CAST("missing LZ dictionary"); + break; + + case Z_ERRNO: + /* gz APIs only: should not happen */ + png_ptr->zstream.msg = PNGZ_MSG_CAST("zlib IO error"); + break; + + case Z_STREAM_ERROR: + /* internal libpng error */ + png_ptr->zstream.msg = PNGZ_MSG_CAST("bad parameters to zlib"); + break; + + case Z_DATA_ERROR: + png_ptr->zstream.msg = PNGZ_MSG_CAST("damaged LZ stream"); + break; + + case Z_MEM_ERROR: + png_ptr->zstream.msg = PNGZ_MSG_CAST("insufficient memory"); + break; + + case Z_BUF_ERROR: + /* End of input or output; not a problem if the caller is doing + * incremental read or write. + */ + png_ptr->zstream.msg = PNGZ_MSG_CAST("truncated"); + break; + + case Z_VERSION_ERROR: + png_ptr->zstream.msg = PNGZ_MSG_CAST("unsupported zlib version"); + break; + + case PNG_UNEXPECTED_ZLIB_RETURN: + /* Compile errors here mean that zlib now uses the value co-opted in + * pngpriv.h for PNG_UNEXPECTED_ZLIB_RETURN; update the switch above + * and change pngpriv.h. Note that this message is "... return", + * whereas the default/Z_OK one is "... return code". + */ + png_ptr->zstream.msg = PNGZ_MSG_CAST("unexpected zlib return"); + break; + } } -#endif /* PNG_SIZE_T */ + +/* png_convert_size: a PNGAPI but no longer in png.h, so deleted + * at libpng 1.5.5! + */ /* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */ -#ifdef PNG_cHRM_SUPPORTED -#ifdef PNG_CHECK_cHRM_SUPPORTED +#ifdef PNG_GAMMA_SUPPORTED /* always set if COLORSPACE */ +static int +png_colorspace_check_gamma(png_const_structrp png_ptr, + png_colorspacerp colorspace, png_fixed_point gAMA, int from) + /* This is called to check a new gamma value against an existing one. The + * routine returns false if the new gamma value should not be written. + * + * 'from' says where the new gamma value comes from: + * + * 0: the new gamma value is the libpng estimate for an ICC profile + * 1: the new gamma value comes from a gAMA chunk + * 2: the new gamma value comes from an sRGB chunk + */ +{ + png_fixed_point gtest; -/* - * Multiply two 32-bit numbers, V1 and V2, using 32-bit - * arithmetic, to produce a 64 bit result in the HI/LO words. - * - * A B - * x C D - * ------ - * AD || BD - * AC || CB || 0 - * - * where A and B are the high and low 16-bit words of V1, - * C and D are the 16-bit words of V2, AD is the product of - * A and D, and X || Y is (X << 16) + Y. -*/ + if ((colorspace->flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 && + (!png_muldiv(>est, colorspace->gamma, PNG_FP_1, gAMA) || + png_gamma_significant(gtest))) + { + /* Either this is an sRGB image, in which case the calculated gamma + * approximation should match, or this is an image with a profile and the + * value libpng calculates for the gamma of the profile does not match the + * value recorded in the file. The former, sRGB, case is an error, the + * latter is just a warning. + */ + if ((colorspace->flags & PNG_COLORSPACE_FROM_sRGB) != 0 || from == 2) + { + png_chunk_report(png_ptr, "gamma value does not match sRGB", + PNG_CHUNK_ERROR); + /* Do not overwrite an sRGB value */ + return from == 2; + } + + else /* sRGB tag not involved */ + { + png_chunk_report(png_ptr, "gamma value does not match libpng estimate", + PNG_CHUNK_WARNING); + return from == 1; + } + } + + return 1; +} void /* PRIVATE */ -png_64bit_product(long v1, long v2, unsigned long *hi_product, - unsigned long *lo_product) +png_colorspace_set_gamma(png_const_structrp png_ptr, + png_colorspacerp colorspace, png_fixed_point gAMA) { - int a, b, c, d; - long lo, hi, x, y; + /* Changed in libpng-1.5.4 to limit the values to ensure overflow can't + * occur. Since the fixed point representation is assymetrical it is + * possible for 1/gamma to overflow the limit of 21474 and this means the + * gamma value must be at least 5/100000 and hence at most 20000.0. For + * safety the limits here are a little narrower. The values are 0.00016 to + * 6250.0, which are truly ridiculous gamma values (and will produce + * displays that are all black or all white.) + * + * In 1.6.0 this test replaces the ones in pngrutil.c, in the gAMA chunk + * handling code, which only required the value to be >0. + */ + png_const_charp errmsg; - a = (v1 >> 16) & 0xffff; - b = v1 & 0xffff; - c = (v2 >> 16) & 0xffff; - d = v2 & 0xffff; + if (gAMA < 16 || gAMA > 625000000) + errmsg = "gamma value out of range"; - lo = b * d; /* BD */ - x = a * d + c * b; /* AD + CB */ - y = ((lo >> 16) & 0xffff) + x; +# ifdef PNG_READ_gAMA_SUPPORTED + /* Allow the application to set the gamma value more than once */ + else if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && + (colorspace->flags & PNG_COLORSPACE_FROM_gAMA) != 0) + errmsg = "duplicate"; +# endif - lo = (lo & 0xffff) | ((y & 0xffff) << 16); - hi = (y >> 16) & 0xffff; + /* Do nothing if the colorspace is already invalid */ + else if (colorspace->flags & PNG_COLORSPACE_INVALID) + return; - hi += a * c; /* AC */ + else + { + if (png_colorspace_check_gamma(png_ptr, colorspace, gAMA, 1/*from gAMA*/)) + { + /* Store this gamma value. */ + colorspace->gamma = gAMA; + colorspace->flags |= + (PNG_COLORSPACE_HAVE_GAMMA | PNG_COLORSPACE_FROM_gAMA); + } - *hi_product = (unsigned long)hi; - *lo_product = (unsigned long)lo; + /* At present if the check_gamma test fails the gamma of the colorspace is + * not updated however the colorspace is not invalidated. This + * corresponds to the case where the existing gamma comes from an sRGB + * chunk or profile. An error message has already been output. + */ + return; + } + + /* Error exit - errmsg has been set. */ + colorspace->flags |= PNG_COLORSPACE_INVALID; + png_chunk_report(png_ptr, errmsg, PNG_CHUNK_WRITE_ERROR); +} + +void /* PRIVATE */ +png_colorspace_sync_info(png_const_structrp png_ptr, png_inforp info_ptr) +{ + if (info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) + { + /* Everything is invalid */ + info_ptr->valid &= ~(PNG_INFO_gAMA|PNG_INFO_cHRM|PNG_INFO_sRGB| + PNG_INFO_iCCP); + +# ifdef PNG_COLORSPACE_SUPPORTED + /* Clean up the iCCP profile now if it won't be used. */ + png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, -1/*not used*/); +# else + PNG_UNUSED(png_ptr) +# endif + } + + else + { +# ifdef PNG_COLORSPACE_SUPPORTED + /* Leave the INFO_iCCP flag set if the pngset.c code has already set + * it; this allows a PNG to contain a profile which matches sRGB and + * yet still have that profile retrievable by the application. + */ + if (info_ptr->colorspace.flags & PNG_COLORSPACE_MATCHES_sRGB) + info_ptr->valid |= PNG_INFO_sRGB; + + else + info_ptr->valid &= ~PNG_INFO_sRGB; + + if (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) + info_ptr->valid |= PNG_INFO_cHRM; + + else + info_ptr->valid &= ~PNG_INFO_cHRM; +# endif + + if (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) + info_ptr->valid |= PNG_INFO_gAMA; + + else + info_ptr->valid &= ~PNG_INFO_gAMA; + } +} + +#ifdef PNG_READ_SUPPORTED +void /* PRIVATE */ +png_colorspace_sync(png_const_structrp png_ptr, png_inforp info_ptr) +{ + if (info_ptr == NULL) /* reduce code size; check here not in the caller */ + return; + + info_ptr->colorspace = png_ptr->colorspace; + png_colorspace_sync_info(png_ptr, info_ptr); +} +#endif +#endif + +#ifdef PNG_COLORSPACE_SUPPORTED +/* Added at libpng-1.5.5 to support read and write of true CIEXYZ values for + * cHRM, as opposed to using chromaticities. These internal APIs return + * non-zero on a parameter error. The X, Y and Z values are required to be + * positive and less than 1.0. + */ +static int +png_xy_from_XYZ(png_xy *xy, const png_XYZ *XYZ) +{ + png_int_32 d, dwhite, whiteX, whiteY; + + d = XYZ->red_X + XYZ->red_Y + XYZ->red_Z; + if (!png_muldiv(&xy->redx, XYZ->red_X, PNG_FP_1, d)) return 1; + if (!png_muldiv(&xy->redy, XYZ->red_Y, PNG_FP_1, d)) return 1; + dwhite = d; + whiteX = XYZ->red_X; + whiteY = XYZ->red_Y; + + d = XYZ->green_X + XYZ->green_Y + XYZ->green_Z; + if (!png_muldiv(&xy->greenx, XYZ->green_X, PNG_FP_1, d)) return 1; + if (!png_muldiv(&xy->greeny, XYZ->green_Y, PNG_FP_1, d)) return 1; + dwhite += d; + whiteX += XYZ->green_X; + whiteY += XYZ->green_Y; + + d = XYZ->blue_X + XYZ->blue_Y + XYZ->blue_Z; + if (!png_muldiv(&xy->bluex, XYZ->blue_X, PNG_FP_1, d)) return 1; + if (!png_muldiv(&xy->bluey, XYZ->blue_Y, PNG_FP_1, d)) return 1; + dwhite += d; + whiteX += XYZ->blue_X; + whiteY += XYZ->blue_Y; + + /* The reference white is simply the sum of the end-point (X,Y,Z) vectors, + * thus: + */ + if (!png_muldiv(&xy->whitex, whiteX, PNG_FP_1, dwhite)) return 1; + if (!png_muldiv(&xy->whitey, whiteY, PNG_FP_1, dwhite)) return 1; + + return 0; +} + +static int +png_XYZ_from_xy(png_XYZ *XYZ, const png_xy *xy) +{ + png_fixed_point red_inverse, green_inverse, blue_scale; + png_fixed_point left, right, denominator; + + /* Check xy and, implicitly, z. Note that wide gamut color spaces typically + * have end points with 0 tristimulus values (these are impossible end + * points, but they are used to cover the possible colors.) + */ + if (xy->redx < 0 || xy->redx > PNG_FP_1) return 1; + if (xy->redy < 0 || xy->redy > PNG_FP_1-xy->redx) return 1; + if (xy->greenx < 0 || xy->greenx > PNG_FP_1) return 1; + if (xy->greeny < 0 || xy->greeny > PNG_FP_1-xy->greenx) return 1; + if (xy->bluex < 0 || xy->bluex > PNG_FP_1) return 1; + if (xy->bluey < 0 || xy->bluey > PNG_FP_1-xy->bluex) return 1; + if (xy->whitex < 0 || xy->whitex > PNG_FP_1) return 1; + if (xy->whitey < 0 || xy->whitey > PNG_FP_1-xy->whitex) return 1; + + /* The reverse calculation is more difficult because the original tristimulus + * value had 9 independent values (red,green,blue)x(X,Y,Z) however only 8 + * derived values were recorded in the cHRM chunk; + * (red,green,blue,white)x(x,y). This loses one degree of freedom and + * therefore an arbitrary ninth value has to be introduced to undo the + * original transformations. + * + * Think of the original end-points as points in (X,Y,Z) space. The + * chromaticity values (c) have the property: + * + * C + * c = --------- + * X + Y + Z + * + * For each c (x,y,z) from the corresponding original C (X,Y,Z). Thus the + * three chromaticity values (x,y,z) for each end-point obey the + * relationship: + * + * x + y + z = 1 + * + * This describes the plane in (X,Y,Z) space that intersects each axis at the + * value 1.0; call this the chromaticity plane. Thus the chromaticity + * calculation has scaled each end-point so that it is on the x+y+z=1 plane + * and chromaticity is the intersection of the vector from the origin to the + * (X,Y,Z) value with the chromaticity plane. + * + * To fully invert the chromaticity calculation we would need the three + * end-point scale factors, (red-scale, green-scale, blue-scale), but these + * were not recorded. Instead we calculated the reference white (X,Y,Z) and + * recorded the chromaticity of this. The reference white (X,Y,Z) would have + * given all three of the scale factors since: + * + * color-C = color-c * color-scale + * white-C = red-C + green-C + blue-C + * = red-c*red-scale + green-c*green-scale + blue-c*blue-scale + * + * But cHRM records only white-x and white-y, so we have lost the white scale + * factor: + * + * white-C = white-c*white-scale + * + * To handle this the inverse transformation makes an arbitrary assumption + * about white-scale: + * + * Assume: white-Y = 1.0 + * Hence: white-scale = 1/white-y + * Or: red-Y + green-Y + blue-Y = 1.0 + * + * Notice the last statement of the assumption gives an equation in three of + * the nine values we want to calculate. 8 more equations come from the + * above routine as summarised at the top above (the chromaticity + * calculation): + * + * Given: color-x = color-X / (color-X + color-Y + color-Z) + * Hence: (color-x - 1)*color-X + color.x*color-Y + color.x*color-Z = 0 + * + * This is 9 simultaneous equations in the 9 variables "color-C" and can be + * solved by Cramer's rule. Cramer's rule requires calculating 10 9x9 matrix + * determinants, however this is not as bad as it seems because only 28 of + * the total of 90 terms in the various matrices are non-zero. Nevertheless + * Cramer's rule is notoriously numerically unstable because the determinant + * calculation involves the difference of large, but similar, numbers. It is + * difficult to be sure that the calculation is stable for real world values + * and it is certain that it becomes unstable where the end points are close + * together. + * + * So this code uses the perhaps slightly less optimal but more + * understandable and totally obvious approach of calculating color-scale. + * + * This algorithm depends on the precision in white-scale and that is + * (1/white-y), so we can immediately see that as white-y approaches 0 the + * accuracy inherent in the cHRM chunk drops off substantially. + * + * libpng arithmetic: a simple invertion of the above equations + * ------------------------------------------------------------ + * + * white_scale = 1/white-y + * white-X = white-x * white-scale + * white-Y = 1.0 + * white-Z = (1 - white-x - white-y) * white_scale + * + * white-C = red-C + green-C + blue-C + * = red-c*red-scale + green-c*green-scale + blue-c*blue-scale + * + * This gives us three equations in (red-scale,green-scale,blue-scale) where + * all the coefficients are now known: + * + * red-x*red-scale + green-x*green-scale + blue-x*blue-scale + * = white-x/white-y + * red-y*red-scale + green-y*green-scale + blue-y*blue-scale = 1 + * red-z*red-scale + green-z*green-scale + blue-z*blue-scale + * = (1 - white-x - white-y)/white-y + * + * In the last equation color-z is (1 - color-x - color-y) so we can add all + * three equations together to get an alternative third: + * + * red-scale + green-scale + blue-scale = 1/white-y = white-scale + * + * So now we have a Cramer's rule solution where the determinants are just + * 3x3 - far more tractible. Unfortunately 3x3 determinants still involve + * multiplication of three coefficients so we can't guarantee to avoid + * overflow in the libpng fixed point representation. Using Cramer's rule in + * floating point is probably a good choice here, but it's not an option for + * fixed point. Instead proceed to simplify the first two equations by + * eliminating what is likely to be the largest value, blue-scale: + * + * blue-scale = white-scale - red-scale - green-scale + * + * Hence: + * + * (red-x - blue-x)*red-scale + (green-x - blue-x)*green-scale = + * (white-x - blue-x)*white-scale + * + * (red-y - blue-y)*red-scale + (green-y - blue-y)*green-scale = + * 1 - blue-y*white-scale + * + * And now we can trivially solve for (red-scale,green-scale): + * + * green-scale = + * (white-x - blue-x)*white-scale - (red-x - blue-x)*red-scale + * ----------------------------------------------------------- + * green-x - blue-x + * + * red-scale = + * 1 - blue-y*white-scale - (green-y - blue-y) * green-scale + * --------------------------------------------------------- + * red-y - blue-y + * + * Hence: + * + * red-scale = + * ( (green-x - blue-x) * (white-y - blue-y) - + * (green-y - blue-y) * (white-x - blue-x) ) / white-y + * ------------------------------------------------------------------------- + * (green-x - blue-x)*(red-y - blue-y)-(green-y - blue-y)*(red-x - blue-x) + * + * green-scale = + * ( (red-y - blue-y) * (white-x - blue-x) - + * (red-x - blue-x) * (white-y - blue-y) ) / white-y + * ------------------------------------------------------------------------- + * (green-x - blue-x)*(red-y - blue-y)-(green-y - blue-y)*(red-x - blue-x) + * + * Accuracy: + * The input values have 5 decimal digits of accuracy. The values are all in + * the range 0 < value < 1, so simple products are in the same range but may + * need up to 10 decimal digits to preserve the original precision and avoid + * underflow. Because we are using a 32-bit signed representation we cannot + * match this; the best is a little over 9 decimal digits, less than 10. + * + * The approach used here is to preserve the maximum precision within the + * signed representation. Because the red-scale calculation above uses the + * difference between two products of values that must be in the range -1..+1 + * it is sufficient to divide the product by 7; ceil(100,000/32767*2). The + * factor is irrelevant in the calculation because it is applied to both + * numerator and denominator. + * + * Note that the values of the differences of the products of the + * chromaticities in the above equations tend to be small, for example for + * the sRGB chromaticities they are: + * + * red numerator: -0.04751 + * green numerator: -0.08788 + * denominator: -0.2241 (without white-y multiplication) + * + * The resultant Y coefficients from the chromaticities of some widely used + * color space definitions are (to 15 decimal places): + * + * sRGB + * 0.212639005871510 0.715168678767756 0.072192315360734 + * Kodak ProPhoto + * 0.288071128229293 0.711843217810102 0.000085653960605 + * Adobe RGB + * 0.297344975250536 0.627363566255466 0.075291458493998 + * Adobe Wide Gamut RGB + * 0.258728243040113 0.724682314948566 0.016589442011321 + */ + /* By the argument, above overflow should be impossible here. The return + * value of 2 indicates an internal error to the caller. + */ + if (!png_muldiv(&left, xy->greenx-xy->bluex, xy->redy - xy->bluey, 7)) + return 2; + if (!png_muldiv(&right, xy->greeny-xy->bluey, xy->redx - xy->bluex, 7)) + return 2; + denominator = left - right; + + /* Now find the red numerator. */ + if (!png_muldiv(&left, xy->greenx-xy->bluex, xy->whitey-xy->bluey, 7)) + return 2; + if (!png_muldiv(&right, xy->greeny-xy->bluey, xy->whitex-xy->bluex, 7)) + return 2; + + /* Overflow is possible here and it indicates an extreme set of PNG cHRM + * chunk values. This calculation actually returns the reciprocal of the + * scale value because this allows us to delay the multiplication of white-y + * into the denominator, which tends to produce a small number. + */ + if (!png_muldiv(&red_inverse, xy->whitey, denominator, left-right) || + red_inverse <= xy->whitey /* r+g+b scales = white scale */) + return 1; + + /* Similarly for green_inverse: */ + if (!png_muldiv(&left, xy->redy-xy->bluey, xy->whitex-xy->bluex, 7)) + return 2; + if (!png_muldiv(&right, xy->redx-xy->bluex, xy->whitey-xy->bluey, 7)) + return 2; + if (!png_muldiv(&green_inverse, xy->whitey, denominator, left-right) || + green_inverse <= xy->whitey) + return 1; + + /* And the blue scale, the checks above guarantee this can't overflow but it + * can still produce 0 for extreme cHRM values. + */ + blue_scale = png_reciprocal(xy->whitey) - png_reciprocal(red_inverse) - + png_reciprocal(green_inverse); + if (blue_scale <= 0) return 1; + + + /* And fill in the png_XYZ: */ + if (!png_muldiv(&XYZ->red_X, xy->redx, PNG_FP_1, red_inverse)) return 1; + if (!png_muldiv(&XYZ->red_Y, xy->redy, PNG_FP_1, red_inverse)) return 1; + if (!png_muldiv(&XYZ->red_Z, PNG_FP_1 - xy->redx - xy->redy, PNG_FP_1, + red_inverse)) + return 1; + + if (!png_muldiv(&XYZ->green_X, xy->greenx, PNG_FP_1, green_inverse)) + return 1; + if (!png_muldiv(&XYZ->green_Y, xy->greeny, PNG_FP_1, green_inverse)) + return 1; + if (!png_muldiv(&XYZ->green_Z, PNG_FP_1 - xy->greenx - xy->greeny, PNG_FP_1, + green_inverse)) + return 1; + + if (!png_muldiv(&XYZ->blue_X, xy->bluex, blue_scale, PNG_FP_1)) return 1; + if (!png_muldiv(&XYZ->blue_Y, xy->bluey, blue_scale, PNG_FP_1)) return 1; + if (!png_muldiv(&XYZ->blue_Z, PNG_FP_1 - xy->bluex - xy->bluey, blue_scale, + PNG_FP_1)) + return 1; + + return 0; /*success*/ +} + +static int +png_XYZ_normalize(png_XYZ *XYZ) +{ + png_int_32 Y; + + if (XYZ->red_Y < 0 || XYZ->green_Y < 0 || XYZ->blue_Y < 0 || + XYZ->red_X < 0 || XYZ->green_X < 0 || XYZ->blue_X < 0 || + XYZ->red_Z < 0 || XYZ->green_Z < 0 || XYZ->blue_Z < 0) + return 1; + + /* Normalize by scaling so the sum of the end-point Y values is PNG_FP_1. + * IMPLEMENTATION NOTE: ANSI requires signed overflow not to occur, therefore + * relying on addition of two positive values producing a negative one is not + * safe. + */ + Y = XYZ->red_Y; + if (0x7fffffff - Y < XYZ->green_X) return 1; + Y += XYZ->green_Y; + if (0x7fffffff - Y < XYZ->blue_X) return 1; + Y += XYZ->blue_Y; + + if (Y != PNG_FP_1) + { + if (!png_muldiv(&XYZ->red_X, XYZ->red_X, PNG_FP_1, Y)) return 1; + if (!png_muldiv(&XYZ->red_Y, XYZ->red_Y, PNG_FP_1, Y)) return 1; + if (!png_muldiv(&XYZ->red_Z, XYZ->red_Z, PNG_FP_1, Y)) return 1; + + if (!png_muldiv(&XYZ->green_X, XYZ->green_X, PNG_FP_1, Y)) return 1; + if (!png_muldiv(&XYZ->green_Y, XYZ->green_Y, PNG_FP_1, Y)) return 1; + if (!png_muldiv(&XYZ->green_Z, XYZ->green_Z, PNG_FP_1, Y)) return 1; + + if (!png_muldiv(&XYZ->blue_X, XYZ->blue_X, PNG_FP_1, Y)) return 1; + if (!png_muldiv(&XYZ->blue_Y, XYZ->blue_Y, PNG_FP_1, Y)) return 1; + if (!png_muldiv(&XYZ->blue_Z, XYZ->blue_Z, PNG_FP_1, Y)) return 1; + } + + return 0; +} + +static int +png_colorspace_endpoints_match(const png_xy *xy1, const png_xy *xy2, int delta) +{ + /* Allow an error of +/-0.01 (absolute value) on each chromaticity */ + return !(PNG_OUT_OF_RANGE(xy1->whitex, xy2->whitex,delta) || + PNG_OUT_OF_RANGE(xy1->whitey, xy2->whitey,delta) || + PNG_OUT_OF_RANGE(xy1->redx, xy2->redx, delta) || + PNG_OUT_OF_RANGE(xy1->redy, xy2->redy, delta) || + PNG_OUT_OF_RANGE(xy1->greenx, xy2->greenx,delta) || + PNG_OUT_OF_RANGE(xy1->greeny, xy2->greeny,delta) || + PNG_OUT_OF_RANGE(xy1->bluex, xy2->bluex, delta) || + PNG_OUT_OF_RANGE(xy1->bluey, xy2->bluey, delta)); +} + +/* Added in libpng-1.6.0, a different check for the validity of a set of cHRM + * chunk chromaticities. Earlier checks used to simply look for the overflow + * condition (where the determinant of the matrix to solve for XYZ ends up zero + * because the chromaticity values are not all distinct.) Despite this it is + * theoretically possible to produce chromaticities that are apparently valid + * but that rapidly degrade to invalid, potentially crashing, sets because of + * arithmetic inaccuracies when calculations are performed on them. The new + * check is to round-trip xy -> XYZ -> xy and then check that the result is + * within a small percentage of the original. + */ +static int +png_colorspace_check_xy(png_XYZ *XYZ, const png_xy *xy) +{ + int result; + png_xy xy_test; + + /* As a side-effect this routine also returns the XYZ endpoints. */ + result = png_XYZ_from_xy(XYZ, xy); + if (result) return result; + + result = png_xy_from_XYZ(&xy_test, XYZ); + if (result) return result; + + if (png_colorspace_endpoints_match(xy, &xy_test, + 5/*actually, the math is pretty accurate*/)) + return 0; + + /* Too much slip */ + return 1; +} + +/* This is the check going the other way. The XYZ is modified to normalize it + * (another side-effect) and the xy chromaticities are returned. + */ +static int +png_colorspace_check_XYZ(png_xy *xy, png_XYZ *XYZ) +{ + int result; + png_XYZ XYZtemp; + + result = png_XYZ_normalize(XYZ); + if (result) return result; + + result = png_xy_from_XYZ(xy, XYZ); + if (result) return result; + + XYZtemp = *XYZ; + return png_colorspace_check_xy(&XYZtemp, xy); +} + +/* Used to check for an endpoint match against sRGB */ +static const png_xy sRGB_xy = /* From ITU-R BT.709-3 */ +{ + /* color x y */ + /* red */ 64000, 33000, + /* green */ 30000, 60000, + /* blue */ 15000, 6000, + /* white */ 31270, 32900 +}; + +static int +png_colorspace_set_xy_and_XYZ(png_const_structrp png_ptr, + png_colorspacerp colorspace, const png_xy *xy, const png_XYZ *XYZ, + int preferred) +{ + if (colorspace->flags & PNG_COLORSPACE_INVALID) + return 0; + + /* The consistency check is performed on the chromaticities; this factors out + * variations because of the normalization (or not) of the end point Y + * values. + */ + if (preferred < 2 && (colorspace->flags & PNG_COLORSPACE_HAVE_ENDPOINTS)) + { + /* The end points must be reasonably close to any we already have. The + * following allows an error of up to +/-.001 + */ + if (!png_colorspace_endpoints_match(xy, &colorspace->end_points_xy, 100)) + { + colorspace->flags |= PNG_COLORSPACE_INVALID; + png_benign_error(png_ptr, "inconsistent chromaticities"); + return 0; /* failed */ + } + + /* Only overwrite with preferred values */ + if (!preferred) + return 1; /* ok, but no change */ + } + + colorspace->end_points_xy = *xy; + colorspace->end_points_XYZ = *XYZ; + colorspace->flags |= PNG_COLORSPACE_HAVE_ENDPOINTS; + + /* The end points are normally quoted to two decimal digits, so allow +/-0.01 + * on this test. + */ + if (png_colorspace_endpoints_match(xy, &sRGB_xy, 1000)) + colorspace->flags |= PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB; + + else + colorspace->flags &= PNG_COLORSPACE_CANCEL( + PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB); + + return 2; /* ok and changed */ } int /* PRIVATE */ -png_check_cHRM_fixed(png_structp png_ptr, - png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, - png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, - png_fixed_point blue_x, png_fixed_point blue_y) +png_colorspace_set_chromaticities(png_const_structrp png_ptr, + png_colorspacerp colorspace, const png_xy *xy, int preferred) { - int ret = 1; - unsigned long xy_hi,xy_lo,yx_hi,yx_lo; + /* We must check the end points to ensure they are reasonable - in the past + * color management systems have crashed as a result of getting bogus + * colorant values, while this isn't the fault of libpng it is the + * responsibility of libpng because PNG carries the bomb and libpng is in a + * position to protect against it. + */ + png_XYZ XYZ; - png_debug(1, "in function png_check_cHRM_fixed"); + switch (png_colorspace_check_xy(&XYZ, xy)) + { + case 0: /* success */ + return png_colorspace_set_xy_and_XYZ(png_ptr, colorspace, xy, &XYZ, + preferred); - if (png_ptr == NULL) + case 1: + /* We can't invert the chromaticities so we can't produce value XYZ + * values. Likely as not a color management system will fail too. + */ + colorspace->flags |= PNG_COLORSPACE_INVALID; + png_benign_error(png_ptr, "invalid chromaticities"); + break; + + default: + /* libpng is broken; this should be a warning but if it happens we + * want error reports so for the moment it is an error. + */ + colorspace->flags |= PNG_COLORSPACE_INVALID; + png_error(png_ptr, "internal error checking chromaticities"); + break; + } + + return 0; /* failed */ +} + +int /* PRIVATE */ +png_colorspace_set_endpoints(png_const_structrp png_ptr, + png_colorspacerp colorspace, const png_XYZ *XYZ_in, int preferred) +{ + png_XYZ XYZ = *XYZ_in; + png_xy xy; + + switch (png_colorspace_check_XYZ(&xy, &XYZ)) + { + case 0: + return png_colorspace_set_xy_and_XYZ(png_ptr, colorspace, &xy, &XYZ, + preferred); + + case 1: + /* End points are invalid. */ + colorspace->flags |= PNG_COLORSPACE_INVALID; + png_benign_error(png_ptr, "invalid end points"); + break; + + default: + colorspace->flags |= PNG_COLORSPACE_INVALID; + png_error(png_ptr, "internal error checking chromaticities"); + break; + } + + return 0; /* failed */ +} + +#if defined(PNG_sRGB_SUPPORTED) || defined(PNG_iCCP_SUPPORTED) +/* Error message generation */ +static char +png_icc_tag_char(png_uint_32 byte) +{ + byte &= 0xff; + if (byte >= 32 && byte <= 126) + return (char)byte; + else + return '?'; +} + +static void +png_icc_tag_name(char *name, png_uint_32 tag) +{ + name[0] = '\''; + name[1] = png_icc_tag_char(tag >> 24); + name[2] = png_icc_tag_char(tag >> 16); + name[3] = png_icc_tag_char(tag >> 8); + name[4] = png_icc_tag_char(tag ); + name[5] = '\''; +} + +static int +is_ICC_signature_char(png_alloc_size_t it) +{ + return it == 32 || (it >= 48 && it <= 57) || (it >= 65 && it <= 90) || + (it >= 97 && it <= 122); +} + +static int is_ICC_signature(png_alloc_size_t it) +{ + return is_ICC_signature_char(it >> 24) /* checks all the top bits */ && + is_ICC_signature_char((it >> 16) & 0xff) && + is_ICC_signature_char((it >> 8) & 0xff) && + is_ICC_signature_char(it & 0xff); +} + +static int +png_icc_profile_error(png_const_structrp png_ptr, png_colorspacerp colorspace, + png_const_charp name, png_alloc_size_t value, png_const_charp reason) +{ + size_t pos; + char message[196]; /* see below for calculation */ + + if (colorspace != NULL) + colorspace->flags |= PNG_COLORSPACE_INVALID; + + pos = png_safecat(message, (sizeof message), 0, "profile '"); /* 9 chars */ + pos = png_safecat(message, pos+79, pos, name); /* Truncate to 79 chars */ + pos = png_safecat(message, (sizeof message), pos, "': "); /* +2 = 90 */ + if (is_ICC_signature(value)) + { + /* So 'value' is at most 4 bytes and the following cast is safe */ + png_icc_tag_name(message+pos, (png_uint_32)value); + pos += 6; /* total +8; less than the else clause */ + message[pos++] = ':'; + message[pos++] = ' '; + } +# ifdef PNG_WARNINGS_SUPPORTED + else + { + char number[PNG_NUMBER_BUFFER_SIZE]; /* +24 = 114*/ + + pos = png_safecat(message, (sizeof message), pos, + png_format_number(number, number+(sizeof number), + PNG_NUMBER_FORMAT_x, value)); + pos = png_safecat(message, (sizeof message), pos, "h: "); /*+2 = 116*/ + } +# endif + /* The 'reason' is an arbitrary message, allow +79 maximum 195 */ + pos = png_safecat(message, (sizeof message), pos, reason); + + /* This is recoverable, but make it unconditionally an app_error on write to + * avoid writing invalid ICC profiles into PNG files. (I.e. we handle them + * on read, with a warning, but on write unless the app turns off + * application errors the PNG won't be written.) + */ + png_chunk_report(png_ptr, message, + (colorspace != NULL) ? PNG_CHUNK_ERROR : PNG_CHUNK_WRITE_ERROR); + + return 0; +} +#endif /* sRGB || iCCP */ + +#ifdef PNG_sRGB_SUPPORTED +int /* PRIVATE */ +png_colorspace_set_sRGB(png_const_structrp png_ptr, png_colorspacerp colorspace, + int intent) +{ + /* sRGB sets known gamma, end points and (from the chunk) intent. */ + /* IMPORTANT: these are not necessarily the values found in an ICC profile + * because ICC profiles store values adapted to a D50 environment; it is + * expected that the ICC profile mediaWhitePointTag will be D50, see the + * checks and code elsewhere to understand this better. + * + * These XYZ values, which are accurate to 5dp, produce rgb to gray + * coefficients of (6968,23435,2366), which are reduced (because they add up + * to 32769 not 32768) to (6968,23434,2366). These are the values that + * libpng has traditionally used (and are the best values given the 15bit + * algorithm used by the rgb to gray code.) + */ + static const png_XYZ sRGB_XYZ = /* D65 XYZ (*not* the D50 adapted values!) */ + { + /* color X Y Z */ + /* red */ 41239, 21264, 1933, + /* green */ 35758, 71517, 11919, + /* blue */ 18048, 7219, 95053 + }; + + /* Do nothing if the colorspace is already invalidated. */ + if (colorspace->flags & PNG_COLORSPACE_INVALID) return 0; - if (white_x < 0 || white_y <= 0 || - red_x < 0 || red_y < 0 || - green_x < 0 || green_y < 0 || - blue_x < 0 || blue_y < 0) + /* Check the intent, then check for existing settings. It is valid for the + * PNG file to have cHRM or gAMA chunks along with sRGB, but the values must + * be consistent with the correct values. If, however, this function is + * called below because an iCCP chunk matches sRGB then it is quite + * conceivable that an older app recorded incorrect gAMA and cHRM because of + * an incorrect calculation based on the values in the profile - this does + * *not* invalidate the profile (though it still produces an error, which can + * be ignored.) + */ + if (intent < 0 || intent >= PNG_sRGB_INTENT_LAST) + return png_icc_profile_error(png_ptr, colorspace, "sRGB", + (unsigned)intent, "invalid sRGB rendering intent"); + + if ((colorspace->flags & PNG_COLORSPACE_HAVE_INTENT) != 0 && + colorspace->rendering_intent != intent) + return png_icc_profile_error(png_ptr, colorspace, "sRGB", + (unsigned)intent, "inconsistent rendering intents"); + + if ((colorspace->flags & PNG_COLORSPACE_FROM_sRGB) != 0) { - png_warning(png_ptr, - "Ignoring attempt to set negative chromaticity value"); - ret = 0; - } - if (white_x > (png_fixed_point) PNG_UINT_31_MAX || - white_y > (png_fixed_point) PNG_UINT_31_MAX || - red_x > (png_fixed_point) PNG_UINT_31_MAX || - red_y > (png_fixed_point) PNG_UINT_31_MAX || - green_x > (png_fixed_point) PNG_UINT_31_MAX || - green_y > (png_fixed_point) PNG_UINT_31_MAX || - blue_x > (png_fixed_point) PNG_UINT_31_MAX || - blue_y > (png_fixed_point) PNG_UINT_31_MAX ) - { - png_warning(png_ptr, - "Ignoring attempt to set chromaticity value exceeding 21474.83"); - ret = 0; - } - if (white_x > 100000L - white_y) - { - png_warning(png_ptr, "Invalid cHRM white point"); - ret = 0; - } - if (red_x > 100000L - red_y) - { - png_warning(png_ptr, "Invalid cHRM red point"); - ret = 0; - } - if (green_x > 100000L - green_y) - { - png_warning(png_ptr, "Invalid cHRM green point"); - ret = 0; - } - if (blue_x > 100000L - blue_y) - { - png_warning(png_ptr, "Invalid cHRM blue point"); - ret = 0; + png_benign_error(png_ptr, "duplicate sRGB information ignored"); + return 0; } - png_64bit_product(green_x - red_x, blue_y - red_y, &xy_hi, &xy_lo); - png_64bit_product(green_y - red_y, blue_x - red_x, &yx_hi, &yx_lo); + /* If the standard sRGB cHRM chunk does not match the one from the PNG file + * warn but overwrite the value with the correct one. + */ + if ((colorspace->flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0 && + !png_colorspace_endpoints_match(&sRGB_xy, &colorspace->end_points_xy, + 100)) + png_chunk_report(png_ptr, "cHRM chunk does not match sRGB", + PNG_CHUNK_ERROR); - if (xy_hi == yx_hi && xy_lo == yx_lo) - { - png_warning(png_ptr, - "Ignoring attempt to set cHRM RGB triangle with zero area"); - ret = 0; - } + /* This check is just done for the error reporting - the routine always + * returns true when the 'from' argument corresponds to sRGB (2). + */ + (void)png_colorspace_check_gamma(png_ptr, colorspace, PNG_GAMMA_sRGB_INVERSE, + 2/*from sRGB*/); - return ret; + /* intent: bugs in GCC force 'int' to be used as the parameter type. */ + colorspace->rendering_intent = (png_uint_16)intent; + colorspace->flags |= PNG_COLORSPACE_HAVE_INTENT; + + /* endpoints */ + colorspace->end_points_xy = sRGB_xy; + colorspace->end_points_XYZ = sRGB_XYZ; + colorspace->flags |= + (PNG_COLORSPACE_HAVE_ENDPOINTS|PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB); + + /* gamma */ + colorspace->gamma = PNG_GAMMA_sRGB_INVERSE; + colorspace->flags |= PNG_COLORSPACE_HAVE_GAMMA; + + /* Finally record that we have an sRGB profile */ + colorspace->flags |= + (PNG_COLORSPACE_MATCHES_sRGB|PNG_COLORSPACE_FROM_sRGB); + + return 1; /* set */ } -#endif /* PNG_CHECK_cHRM_SUPPORTED */ -#endif /* PNG_cHRM_SUPPORTED */ +#endif /* sRGB */ + +#ifdef PNG_iCCP_SUPPORTED +/* Encoded value of D50 as an ICC XYZNumber. From the ICC 2010 spec the value + * is XYZ(0.9642,1.0,0.8249), which scales to: + * + * (63189.8112, 65536, 54060.6464) + */ +static const png_byte D50_nCIEXYZ[12] = + { 0x00, 0x00, 0xf6, 0xd6, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0xd3, 0x2d }; + +int /* PRIVATE */ +png_icc_check_length(png_const_structrp png_ptr, png_colorspacerp colorspace, + png_const_charp name, png_uint_32 profile_length) +{ + if (profile_length < 132) + return png_icc_profile_error(png_ptr, colorspace, name, profile_length, + "too short"); + + if (profile_length & 3) + return png_icc_profile_error(png_ptr, colorspace, name, profile_length, + "invalid length"); + + return 1; +} + +int /* PRIVATE */ +png_icc_check_header(png_const_structrp png_ptr, png_colorspacerp colorspace, + png_const_charp name, png_uint_32 profile_length, + png_const_bytep profile/* first 132 bytes only */, int color_type) +{ + png_uint_32 temp; + + /* Length check; this cannot be ignored in this code because profile_length + * is used later to check the tag table, so even if the profile seems over + * long profile_length from the caller must be correct. The caller can fix + * this up on read or write by just passing in the profile header length. + */ + temp = png_get_uint_32(profile); + if (temp != profile_length) + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "length does not match profile"); + + temp = png_get_uint_32(profile+128); /* tag count: 12 bytes/tag */ + if (temp > 357913930 || /* (2^32-4-132)/12: maximum possible tag count */ + profile_length < 132+12*temp) /* truncated tag table */ + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "tag count too large"); + + /* The 'intent' must be valid or we can't store it, ICC limits the intent to + * 16 bits. + */ + temp = png_get_uint_32(profile+64); + if (temp >= 0xffff) /* The ICC limit */ + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "invalid rendering intent"); + + /* This is just a warning because the profile may be valid in future + * versions. + */ + if (temp >= PNG_sRGB_INTENT_LAST) + (void)png_icc_profile_error(png_ptr, NULL, name, temp, + "intent outside defined range"); + + /* At this point the tag table can't be checked because it hasn't necessarily + * been loaded; however, various header fields can be checked. These checks + * are for values permitted by the PNG spec in an ICC profile; the PNG spec + * restricts the profiles that can be passed in an iCCP chunk (they must be + * appropriate to processing PNG data!) + */ + + /* Data checks (could be skipped). These checks must be independent of the + * version number; however, the version number doesn't accomodate changes in + * the header fields (just the known tags and the interpretation of the + * data.) + */ + temp = png_get_uint_32(profile+36); /* signature 'ascp' */ + if (temp != 0x61637370) + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "invalid signature"); + + /* Currently the PCS illuminant/adopted white point (the computational + * white point) are required to be D50, + * however the profile contains a record of the illuminant so perhaps ICC + * expects to be able to change this in the future (despite the rationale in + * the introduction for using a fixed PCS adopted white.) Consequently the + * following is just a warning. + */ + if (memcmp(profile+68, D50_nCIEXYZ, 12) != 0) + (void)png_icc_profile_error(png_ptr, NULL, name, 0/*no tag value*/, + "PCS illuminant is not D50"); + + /* The PNG spec requires this: + * "If the iCCP chunk is present, the image samples conform to the colour + * space represented by the embedded ICC profile as defined by the + * International Color Consortium [ICC]. The colour space of the ICC profile + * shall be an RGB colour space for colour images (PNG colour types 2, 3, and + * 6), or a greyscale colour space for greyscale images (PNG colour types 0 + * and 4)." + * + * This checking code ensures the embedded profile (on either read or write) + * conforms to the specification requirements. Notice that an ICC 'gray' + * color-space profile contains the information to transform the monochrome + * data to XYZ or L*a*b (according to which PCS the profile uses) and this + * should be used in preference to the standard libpng K channel replication + * into R, G and B channels. + * + * Previously it was suggested that an RGB profile on grayscale data could be + * handled. However it it is clear that using an RGB profile in this context + * must be an error - there is no specification of what it means. Thus it is + * almost certainly more correct to ignore the profile. + */ + temp = png_get_uint_32(profile+16); /* data colour space field */ + switch (temp) + { + case 0x52474220: /* 'RGB ' */ + if (!(color_type & PNG_COLOR_MASK_COLOR)) + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "RGB color space not permitted on grayscale PNG"); + break; + + case 0x47524159: /* 'GRAY' */ + if (color_type & PNG_COLOR_MASK_COLOR) + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "Gray color space not permitted on RGB PNG"); + break; + + default: + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "invalid ICC profile color space"); + } + + /* It is up to the application to check that the profile class matches the + * application requirements; the spec provides no guidance, but it's pretty + * weird if the profile is not scanner ('scnr'), monitor ('mntr'), printer + * ('prtr') or 'spac' (for generic color spaces). Issue a warning in these + * cases. Issue an error for device link or abstract profiles - these don't + * contain the records necessary to transform the color-space to anything + * other than the target device (and not even that for an abstract profile). + * Profiles of these classes may not be embedded in images. + */ + temp = png_get_uint_32(profile+12); /* profile/device class */ + switch (temp) + { + case 0x73636E72: /* 'scnr' */ + case 0x6D6E7472: /* 'mntr' */ + case 0x70727472: /* 'prtr' */ + case 0x73706163: /* 'spac' */ + /* All supported */ + break; + + case 0x61627374: /* 'abst' */ + /* May not be embedded in an image */ + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "invalid embedded Abstract ICC profile"); + + case 0x6C696E6B: /* 'link' */ + /* DeviceLink profiles cannnot be interpreted in a non-device specific + * fashion, if an app uses the AToB0Tag in the profile the results are + * undefined unless the result is sent to the intended device, + * therefore a DeviceLink profile should not be found embedded in a + * PNG. + */ + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "unexpected DeviceLink ICC profile class"); + + case 0x6E6D636C: /* 'nmcl' */ + /* A NamedColor profile is also device specific, however it doesn't + * contain an AToB0 tag that is open to misintrepretation. Almost + * certainly it will fail the tests below. + */ + (void)png_icc_profile_error(png_ptr, NULL, name, temp, + "unexpected NamedColor ICC profile class"); + break; + + default: + /* To allow for future enhancements to the profile accept unrecognized + * profile classes with a warning, these then hit the test below on the + * tag content to ensure they are backward compatible with one of the + * understood profiles. + */ + (void)png_icc_profile_error(png_ptr, NULL, name, temp, + "unrecognized ICC profile class"); + break; + } + + /* For any profile other than a device link one the PCS must be encoded + * either in XYZ or Lab. + */ + temp = png_get_uint_32(profile+20); + switch (temp) + { + case 0x58595A20: /* 'XYZ ' */ + case 0x4C616220: /* 'Lab ' */ + break; + + default: + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "unexpected ICC PCS encoding"); + } + + return 1; +} + +int /* PRIVATE */ +png_icc_check_tag_table(png_const_structrp png_ptr, png_colorspacerp colorspace, + png_const_charp name, png_uint_32 profile_length, + png_const_bytep profile /* header plus whole tag table */) +{ + png_uint_32 tag_count = png_get_uint_32(profile+128); + png_uint_32 itag; + png_const_bytep tag = profile+132; /* The first tag */ + + /* First scan all the tags in the table and add bits to the icc_info value + * (temporarily in 'tags'). + */ + for (itag=0; itag < tag_count; ++itag, tag += 12) + { + png_uint_32 tag_id = png_get_uint_32(tag+0); + png_uint_32 tag_start = png_get_uint_32(tag+4); /* must be aligned */ + png_uint_32 tag_length = png_get_uint_32(tag+8);/* not padded */ + + /* The ICC specification does not exclude zero length tags, therefore the + * start might actually be anywhere if there is no data, but this would be + * a clear abuse of the intent of the standard so the start is checked for + * being in range. All defined tag types have an 8 byte header - a 4 byte + * type signature then 0. + */ + if ((tag_start & 3) != 0) + { + /* CNHP730S.icc shipped with Microsoft Windows 64 violates this, it is + * only a warning here because libpng does not care about the + * alignment. + */ + (void)png_icc_profile_error(png_ptr, NULL, name, tag_id, + "ICC profile tag start not a multiple of 4"); + } + + /* This is a hard error; potentially it can cause read outside the + * profile. + */ + if (tag_start > profile_length || tag_length > profile_length - tag_start) + return png_icc_profile_error(png_ptr, colorspace, name, tag_id, + "ICC profile tag outside profile"); + } + + return 1; /* success, maybe with warnings */ +} + +#ifdef PNG_sRGB_SUPPORTED +/* Information about the known ICC sRGB profiles */ +static const struct +{ + png_uint_32 adler, crc, length; + png_uint_32 md5[4]; + png_byte have_md5; + png_byte is_broken; + png_uint_16 intent; + +# define PNG_MD5(a,b,c,d) { a, b, c, d }, (a!=0)||(b!=0)||(c!=0)||(d!=0) +# define PNG_ICC_CHECKSUM(adler, crc, md5, intent, broke, date, length, fname)\ + { adler, crc, length, md5, broke, intent }, + +} png_sRGB_checks[] = +{ + /* This data comes from contrib/tools/checksum-icc run on downloads of + * all four ICC sRGB profiles from www.color.org. + */ + /* adler32, crc32, MD5[4], intent, date, length, file-name */ + PNG_ICC_CHECKSUM(0x0a3fd9f6, 0x3b8772b9, + PNG_MD5(0x29f83dde, 0xaff255ae, 0x7842fae4, 0xca83390d), 0, 0, + "2009/03/27 21:36:31", 3048, "sRGB_IEC61966-2-1_black_scaled.icc") + + /* ICC sRGB v2 perceptual no black-compensation: */ + PNG_ICC_CHECKSUM(0x4909e5e1, 0x427ebb21, + PNG_MD5(0xc95bd637, 0xe95d8a3b, 0x0df38f99, 0xc1320389), 1, 0, + "2009/03/27 21:37:45", 3052, "sRGB_IEC61966-2-1_no_black_scaling.icc") + + PNG_ICC_CHECKSUM(0xfd2144a1, 0x306fd8ae, + PNG_MD5(0xfc663378, 0x37e2886b, 0xfd72e983, 0x8228f1b8), 0, 0, + "2009/08/10 17:28:01", 60988, "sRGB_v4_ICC_preference_displayclass.icc") + + /* ICC sRGB v4 perceptual */ + PNG_ICC_CHECKSUM(0x209c35d2, 0xbbef7812, + PNG_MD5(0x34562abf, 0x994ccd06, 0x6d2c5721, 0xd0d68c5d), 0, 0, + "2007/07/25 00:05:37", 60960, "sRGB_v4_ICC_preference.icc") + + /* The following profiles have no known MD5 checksum. If there is a match + * on the (empty) MD5 the other fields are used to attempt a match and + * a warning is produced. The first two of these profiles have a 'cprt' tag + * which suggests that they were also made by Hewlett Packard. + */ + PNG_ICC_CHECKSUM(0xa054d762, 0x5d5129ce, + PNG_MD5(0x00000000, 0x00000000, 0x00000000, 0x00000000), 1, 0, + "2004/07/21 18:57:42", 3024, "sRGB_IEC61966-2-1_noBPC.icc") + + /* This is a 'mntr' (display) profile with a mediaWhitePointTag that does not + * match the D50 PCS illuminant in the header (it is in fact the D65 values, + * so the white point is recorded as the un-adapted value.) The profiles + * below only differ in one byte - the intent - and are basically the same as + * the previous profile except for the mediaWhitePointTag error and a missing + * chromaticAdaptationTag. + */ + PNG_ICC_CHECKSUM(0xf784f3fb, 0x182ea552, + PNG_MD5(0x00000000, 0x00000000, 0x00000000, 0x00000000), 0, 1/*broken*/, + "1998/02/09 06:49:00", 3144, "HP-Microsoft sRGB v2 perceptual") + + PNG_ICC_CHECKSUM(0x0398f3fc, 0xf29e526d, + PNG_MD5(0x00000000, 0x00000000, 0x00000000, 0x00000000), 1, 1/*broken*/, + "1998/02/09 06:49:00", 3144, "HP-Microsoft sRGB v2 media-relative") +}; + +static int +png_compare_ICC_profile_with_sRGB(png_const_structrp png_ptr, + png_const_bytep profile, uLong adler) +{ + /* The quick check is to verify just the MD5 signature and trust the + * rest of the data. Because the profile has already been verified for + * correctness this is safe. png_colorspace_set_sRGB will check the 'intent' + * field too, so if the profile has been edited with an intent not defined + * by sRGB (but maybe defined by a later ICC specification) the read of + * the profile will fail at that point. + */ + png_uint_32 length = 0; + png_uint_32 intent = 0x10000; /* invalid */ +#if PNG_sRGB_PROFILE_CHECKS > 1 + uLong crc = 0; /* the value for 0 length data */ +#endif + unsigned int i; + + for (i=0; i < (sizeof png_sRGB_checks) / (sizeof png_sRGB_checks[0]); ++i) + { + if (png_get_uint_32(profile+84) == png_sRGB_checks[i].md5[0] && + png_get_uint_32(profile+88) == png_sRGB_checks[i].md5[1] && + png_get_uint_32(profile+92) == png_sRGB_checks[i].md5[2] && + png_get_uint_32(profile+96) == png_sRGB_checks[i].md5[3]) + { + /* This may be one of the old HP profiles without an MD5, in that + * case we can only use the length and Adler32 (note that these + * are not used by default if there is an MD5!) + */ +# if PNG_sRGB_PROFILE_CHECKS == 0 + if (png_sRGB_checks[i].have_md5) + return 1+png_sRGB_checks[i].is_broken; +# endif + + /* Profile is unsigned or more checks have been configured in. */ + if (length == 0) + { + length = png_get_uint_32(profile); + intent = png_get_uint_32(profile+64); + } + + /* Length *and* intent must match */ + if (length == png_sRGB_checks[i].length && + intent == png_sRGB_checks[i].intent) + { + /* Now calculate the adler32 if not done already. */ + if (adler == 0) + { + adler = adler32(0, NULL, 0); + adler = adler32(adler, profile, length); + } + + if (adler == png_sRGB_checks[i].adler) + { + /* These basic checks suggest that the data has not been + * modified, but if the check level is more than 1 perform + * our own crc32 checksum on the data. + */ +# if PNG_sRGB_PROFILE_CHECKS > 1 + if (crc == 0) + { + crc = crc32(0, NULL, 0); + crc = crc32(crc, profile, length); + } + + /* So this check must pass for the 'return' below to happen. + */ + if (crc == png_sRGB_checks[i].crc) +# endif + { + if (png_sRGB_checks[i].is_broken) + { + /* These profiles are known to have bad data that may cause + * problems if they are used, therefore attempt to + * discourage their use, skip the 'have_md5' warning below, + * which is made irrelevant by this error. + */ + png_chunk_report(png_ptr, "known incorrect sRGB profile", + PNG_CHUNK_ERROR); + } + + /* Warn that this being done; this isn't even an error since + * the profile is perfectly valid, but it would be nice if + * people used the up-to-date ones. + */ + else if (!png_sRGB_checks[i].have_md5) + { + png_chunk_report(png_ptr, + "out-of-date sRGB profile with no signature", + PNG_CHUNK_WARNING); + } + + return 1+png_sRGB_checks[i].is_broken; + } + } + } + +# if PNG_sRGB_PROFILE_CHECKS > 0 + /* The signature matched, but the profile had been changed in some + * way. This is an apparent violation of the ICC terms of use and, + * anyway, probably indicates a data error or uninformed hacking. + */ + if (png_sRGB_checks[i].have_md5) + png_benign_error(png_ptr, + "copyright violation: edited ICC profile ignored"); +# endif + } + } + + return 0; /* no match */ +} +#endif + +#ifdef PNG_sRGB_SUPPORTED +void /* PRIVATE */ +png_icc_set_sRGB(png_const_structrp png_ptr, + png_colorspacerp colorspace, png_const_bytep profile, uLong adler) +{ + /* Is this profile one of the known ICC sRGB profiles? If it is, just set + * the sRGB information. + */ + if (png_compare_ICC_profile_with_sRGB(png_ptr, profile, adler)) + (void)png_colorspace_set_sRGB(png_ptr, colorspace, + (int)/*already checked*/png_get_uint_32(profile+64)); +} +#endif /* PNG_READ_sRGB_SUPPORTED */ + +int /* PRIVATE */ +png_colorspace_set_ICC(png_const_structrp png_ptr, png_colorspacerp colorspace, + png_const_charp name, png_uint_32 profile_length, png_const_bytep profile, + int color_type) +{ + if (colorspace->flags & PNG_COLORSPACE_INVALID) + return 0; + + if (png_icc_check_length(png_ptr, colorspace, name, profile_length) && + png_icc_check_header(png_ptr, colorspace, name, profile_length, profile, + color_type) && + png_icc_check_tag_table(png_ptr, colorspace, name, profile_length, + profile)) + { +# ifdef PNG_sRGB_SUPPORTED + /* If no sRGB support, don't try storing sRGB information */ + png_icc_set_sRGB(png_ptr, colorspace, profile, 0); +# endif + return 1; + } + + /* Failure case */ + return 0; +} +#endif /* iCCP */ + +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED +void /* PRIVATE */ +png_colorspace_set_rgb_coefficients(png_structrp png_ptr) +{ + /* Set the rgb_to_gray coefficients from the colorspace. */ + if (!png_ptr->rgb_to_gray_coefficients_set && + (png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0) + { + /* png_set_background has not been called, get the coefficients from the Y + * values of the colorspace colorants. + */ + png_fixed_point r = png_ptr->colorspace.end_points_XYZ.red_Y; + png_fixed_point g = png_ptr->colorspace.end_points_XYZ.green_Y; + png_fixed_point b = png_ptr->colorspace.end_points_XYZ.blue_Y; + png_fixed_point total = r+g+b; + + if (total > 0 && + r >= 0 && png_muldiv(&r, r, 32768, total) && r >= 0 && r <= 32768 && + g >= 0 && png_muldiv(&g, g, 32768, total) && g >= 0 && g <= 32768 && + b >= 0 && png_muldiv(&b, b, 32768, total) && b >= 0 && b <= 32768 && + r+g+b <= 32769) + { + /* We allow 0 coefficients here. r+g+b may be 32769 if two or + * all of the coefficients were rounded up. Handle this by + * reducing the *largest* coefficient by 1; this matches the + * approach used for the default coefficients in pngrtran.c + */ + int add = 0; + + if (r+g+b > 32768) + add = -1; + else if (r+g+b < 32768) + add = 1; + + if (add != 0) + { + if (g >= r && g >= b) + g += add; + else if (r >= g && r >= b) + r += add; + else + b += add; + } + + /* Check for an internal error. */ + if (r+g+b != 32768) + png_error(png_ptr, + "internal error handling cHRM coefficients"); + + else + { + png_ptr->rgb_to_gray_red_coeff = (png_uint_16)r; + png_ptr->rgb_to_gray_green_coeff = (png_uint_16)g; + } + } + + /* This is a png_error at present even though it could be ignored - + * it should never happen, but it is important that if it does, the + * bug is fixed. + */ + else + png_error(png_ptr, "internal error handling cHRM->XYZ"); + } +} +#endif + +#endif /* COLORSPACE */ void /* PRIVATE */ -png_check_IHDR(png_structp png_ptr, +png_check_IHDR(png_const_structrp png_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, int interlace_type, int compression_type, int filter_type) @@ -791,21 +2376,22 @@ png_check_IHDR(png_structp png_ptr, error = 1; } -#ifdef PNG_SET_USER_LIMITS_SUPPORTED - if (width > png_ptr->user_width_max || width > PNG_USER_WIDTH_MAX) -#else +# ifdef PNG_SET_USER_LIMITS_SUPPORTED + if (width > png_ptr->user_width_max) + +# else if (width > PNG_USER_WIDTH_MAX) -#endif +# endif { png_warning(png_ptr, "Image width exceeds user limit in IHDR"); error = 1; } -#ifdef PNG_SET_USER_LIMITS_SUPPORTED - if (height > png_ptr->user_height_max || height > PNG_USER_HEIGHT_MAX) -#else +# ifdef PNG_SET_USER_LIMITS_SUPPORTED + if (height > png_ptr->user_height_max) +# else if (height > PNG_USER_HEIGHT_MAX) -#endif +# endif { png_warning(png_ptr, "Image height exceeds user limit in IHDR"); error = 1; @@ -817,15 +2403,15 @@ png_check_IHDR(png_structp png_ptr, error = 1; } - if ( height > PNG_UINT_31_MAX) + if (height > PNG_UINT_31_MAX) { png_warning(png_ptr, "Invalid image height in IHDR"); error = 1; } - if ( width > (PNG_UINT_32_MAX + if (width > (PNG_UINT_32_MAX >> 3) /* 8-byte RGBA pixels */ - - 64 /* bigrowbuf hack */ + - 48 /* bigrowbuf hack */ - 1 /* filter byte */ - 7*8 /* rounding of width to multiple of 8 pixels */ - 8) /* extra max_pixel_depth pad */ @@ -867,7 +2453,7 @@ png_check_IHDR(png_structp png_ptr, error = 1; } -#ifdef PNG_MNG_FEATURES_SUPPORTED +# ifdef PNG_MNG_FEATURES_SUPPORTED /* Accept filter_method 64 (intrapixel differencing) only if * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and * 2. Libpng did not read a PNG signature (this filter_method is only @@ -884,10 +2470,10 @@ png_check_IHDR(png_structp png_ptr, if (filter_type != PNG_FILTER_TYPE_BASE) { if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && - (filter_type == PNG_INTRAPIXEL_DIFFERENCING) && - ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) && - (color_type == PNG_COLOR_TYPE_RGB || - color_type == PNG_COLOR_TYPE_RGB_ALPHA))) + (filter_type == PNG_INTRAPIXEL_DIFFERENCING) && + ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) && + (color_type == PNG_COLOR_TYPE_RGB || + color_type == PNG_COLOR_TYPE_RGB_ALPHA))) { png_warning(png_ptr, "Unknown filter method in IHDR"); error = 1; @@ -900,15 +2486,1813 @@ png_check_IHDR(png_structp png_ptr, } } -#else +# else if (filter_type != PNG_FILTER_TYPE_BASE) { png_warning(png_ptr, "Unknown filter method in IHDR"); error = 1; } -#endif +# endif if (error == 1) png_error(png_ptr, "Invalid IHDR data"); } + +#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) +/* ASCII to fp functions */ +/* Check an ASCII formated floating point value, see the more detailed + * comments in pngpriv.h + */ +/* The following is used internally to preserve the sticky flags */ +#define png_fp_add(state, flags) ((state) |= (flags)) +#define png_fp_set(state, value) ((state) = (value) | ((state) & PNG_FP_STICKY)) + +int /* PRIVATE */ +png_check_fp_number(png_const_charp string, png_size_t size, int *statep, + png_size_tp whereami) +{ + int state = *statep; + png_size_t i = *whereami; + + while (i < size) + { + int type; + /* First find the type of the next character */ + switch (string[i]) + { + case 43: type = PNG_FP_SAW_SIGN; break; + case 45: type = PNG_FP_SAW_SIGN + PNG_FP_NEGATIVE; break; + case 46: type = PNG_FP_SAW_DOT; break; + case 48: type = PNG_FP_SAW_DIGIT; break; + case 49: case 50: case 51: case 52: + case 53: case 54: case 55: case 56: + case 57: type = PNG_FP_SAW_DIGIT + PNG_FP_NONZERO; break; + case 69: + case 101: type = PNG_FP_SAW_E; break; + default: goto PNG_FP_End; + } + + /* Now deal with this type according to the current + * state, the type is arranged to not overlap the + * bits of the PNG_FP_STATE. + */ + switch ((state & PNG_FP_STATE) + (type & PNG_FP_SAW_ANY)) + { + case PNG_FP_INTEGER + PNG_FP_SAW_SIGN: + if (state & PNG_FP_SAW_ANY) + goto PNG_FP_End; /* not a part of the number */ + + png_fp_add(state, type); + break; + + case PNG_FP_INTEGER + PNG_FP_SAW_DOT: + /* Ok as trailer, ok as lead of fraction. */ + if (state & PNG_FP_SAW_DOT) /* two dots */ + goto PNG_FP_End; + + else if (state & PNG_FP_SAW_DIGIT) /* trailing dot? */ + png_fp_add(state, type); + + else + png_fp_set(state, PNG_FP_FRACTION | type); + + break; + + case PNG_FP_INTEGER + PNG_FP_SAW_DIGIT: + if (state & PNG_FP_SAW_DOT) /* delayed fraction */ + png_fp_set(state, PNG_FP_FRACTION | PNG_FP_SAW_DOT); + + png_fp_add(state, type | PNG_FP_WAS_VALID); + + break; + + case PNG_FP_INTEGER + PNG_FP_SAW_E: + if ((state & PNG_FP_SAW_DIGIT) == 0) + goto PNG_FP_End; + + png_fp_set(state, PNG_FP_EXPONENT); + + break; + + /* case PNG_FP_FRACTION + PNG_FP_SAW_SIGN: + goto PNG_FP_End; ** no sign in fraction */ + + /* case PNG_FP_FRACTION + PNG_FP_SAW_DOT: + goto PNG_FP_End; ** Because SAW_DOT is always set */ + + case PNG_FP_FRACTION + PNG_FP_SAW_DIGIT: + png_fp_add(state, type | PNG_FP_WAS_VALID); + break; + + case PNG_FP_FRACTION + PNG_FP_SAW_E: + /* This is correct because the trailing '.' on an + * integer is handled above - so we can only get here + * with the sequence ".E" (with no preceding digits). + */ + if ((state & PNG_FP_SAW_DIGIT) == 0) + goto PNG_FP_End; + + png_fp_set(state, PNG_FP_EXPONENT); + + break; + + case PNG_FP_EXPONENT + PNG_FP_SAW_SIGN: + if (state & PNG_FP_SAW_ANY) + goto PNG_FP_End; /* not a part of the number */ + + png_fp_add(state, PNG_FP_SAW_SIGN); + + break; + + /* case PNG_FP_EXPONENT + PNG_FP_SAW_DOT: + goto PNG_FP_End; */ + + case PNG_FP_EXPONENT + PNG_FP_SAW_DIGIT: + png_fp_add(state, PNG_FP_SAW_DIGIT | PNG_FP_WAS_VALID); + + break; + + /* case PNG_FP_EXPONEXT + PNG_FP_SAW_E: + goto PNG_FP_End; */ + + default: goto PNG_FP_End; /* I.e. break 2 */ + } + + /* The character seems ok, continue. */ + ++i; + } + +PNG_FP_End: + /* Here at the end, update the state and return the correct + * return code. + */ + *statep = state; + *whereami = i; + + return (state & PNG_FP_SAW_DIGIT) != 0; +} + + +/* The same but for a complete string. */ +int +png_check_fp_string(png_const_charp string, png_size_t size) +{ + int state=0; + png_size_t char_index=0; + + if (png_check_fp_number(string, size, &state, &char_index) && + (char_index == size || string[char_index] == 0)) + return state /* must be non-zero - see above */; + + return 0; /* i.e. fail */ +} +#endif /* pCAL or sCAL */ + +#ifdef PNG_sCAL_SUPPORTED +# ifdef PNG_FLOATING_POINT_SUPPORTED +/* Utility used below - a simple accurate power of ten from an integral + * exponent. + */ +static double +png_pow10(int power) +{ + int recip = 0; + double d = 1; + + /* Handle negative exponent with a reciprocal at the end because + * 10 is exact whereas .1 is inexact in base 2 + */ + if (power < 0) + { + if (power < DBL_MIN_10_EXP) return 0; + recip = 1, power = -power; + } + + if (power > 0) + { + /* Decompose power bitwise. */ + double mult = 10; + do + { + if (power & 1) d *= mult; + mult *= mult; + power >>= 1; + } + while (power > 0); + + if (recip) d = 1/d; + } + /* else power is 0 and d is 1 */ + + return d; +} + +/* Function to format a floating point value in ASCII with a given + * precision. + */ +void /* PRIVATE */ +png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size, + double fp, unsigned int precision) +{ + /* We use standard functions from math.h, but not printf because + * that would require stdio. The caller must supply a buffer of + * sufficient size or we will png_error. The tests on size and + * the space in ascii[] consumed are indicated below. + */ + if (precision < 1) + precision = DBL_DIG; + + /* Enforce the limit of the implementation precision too. */ + if (precision > DBL_DIG+1) + precision = DBL_DIG+1; + + /* Basic sanity checks */ + if (size >= precision+5) /* See the requirements below. */ + { + if (fp < 0) + { + fp = -fp; + *ascii++ = 45; /* '-' PLUS 1 TOTAL 1 */ + --size; + } + + if (fp >= DBL_MIN && fp <= DBL_MAX) + { + int exp_b10; /* A base 10 exponent */ + double base; /* 10^exp_b10 */ + + /* First extract a base 10 exponent of the number, + * the calculation below rounds down when converting + * from base 2 to base 10 (multiply by log10(2) - + * 0.3010, but 77/256 is 0.3008, so exp_b10 needs to + * be increased. Note that the arithmetic shift + * performs a floor() unlike C arithmetic - using a + * C multiply would break the following for negative + * exponents. + */ + (void)frexp(fp, &exp_b10); /* exponent to base 2 */ + + exp_b10 = (exp_b10 * 77) >> 8; /* <= exponent to base 10 */ + + /* Avoid underflow here. */ + base = png_pow10(exp_b10); /* May underflow */ + + while (base < DBL_MIN || base < fp) + { + /* And this may overflow. */ + double test = png_pow10(exp_b10+1); + + if (test <= DBL_MAX) + ++exp_b10, base = test; + + else + break; + } + + /* Normalize fp and correct exp_b10, after this fp is in the + * range [.1,1) and exp_b10 is both the exponent and the digit + * *before* which the decimal point should be inserted + * (starting with 0 for the first digit). Note that this + * works even if 10^exp_b10 is out of range because of the + * test on DBL_MAX above. + */ + fp /= base; + while (fp >= 1) fp /= 10, ++exp_b10; + + /* Because of the code above fp may, at this point, be + * less than .1, this is ok because the code below can + * handle the leading zeros this generates, so no attempt + * is made to correct that here. + */ + + { + int czero, clead, cdigits; + char exponent[10]; + + /* Allow up to two leading zeros - this will not lengthen + * the number compared to using E-n. + */ + if (exp_b10 < 0 && exp_b10 > -3) /* PLUS 3 TOTAL 4 */ + { + czero = -exp_b10; /* PLUS 2 digits: TOTAL 3 */ + exp_b10 = 0; /* Dot added below before first output. */ + } + else + czero = 0; /* No zeros to add */ + + /* Generate the digit list, stripping trailing zeros and + * inserting a '.' before a digit if the exponent is 0. + */ + clead = czero; /* Count of leading zeros */ + cdigits = 0; /* Count of digits in list. */ + + do + { + double d; + + fp *= 10; + /* Use modf here, not floor and subtract, so that + * the separation is done in one step. At the end + * of the loop don't break the number into parts so + * that the final digit is rounded. + */ + if (cdigits+czero-clead+1 < (int)precision) + fp = modf(fp, &d); + + else + { + d = floor(fp + .5); + + if (d > 9) + { + /* Rounding up to 10, handle that here. */ + if (czero > 0) + { + --czero, d = 1; + if (cdigits == 0) --clead; + } + else + { + while (cdigits > 0 && d > 9) + { + int ch = *--ascii; + + if (exp_b10 != (-1)) + ++exp_b10; + + else if (ch == 46) + { + ch = *--ascii, ++size; + /* Advance exp_b10 to '1', so that the + * decimal point happens after the + * previous digit. + */ + exp_b10 = 1; + } + + --cdigits; + d = ch - 47; /* I.e. 1+(ch-48) */ + } + + /* Did we reach the beginning? If so adjust the + * exponent but take into account the leading + * decimal point. + */ + if (d > 9) /* cdigits == 0 */ + { + if (exp_b10 == (-1)) + { + /* Leading decimal point (plus zeros?), if + * we lose the decimal point here it must + * be reentered below. + */ + int ch = *--ascii; + + if (ch == 46) + ++size, exp_b10 = 1; + + /* Else lost a leading zero, so 'exp_b10' is + * still ok at (-1) + */ + } + else + ++exp_b10; + + /* In all cases we output a '1' */ + d = 1; + } + } + } + fp = 0; /* Guarantees termination below. */ + } + + if (d == 0) + { + ++czero; + if (cdigits == 0) ++clead; + } + else + { + /* Included embedded zeros in the digit count. */ + cdigits += czero - clead; + clead = 0; + + while (czero > 0) + { + /* exp_b10 == (-1) means we just output the decimal + * place - after the DP don't adjust 'exp_b10' any + * more! + */ + if (exp_b10 != (-1)) + { + if (exp_b10 == 0) *ascii++ = 46, --size; + /* PLUS 1: TOTAL 4 */ + --exp_b10; + } + *ascii++ = 48, --czero; + } + + if (exp_b10 != (-1)) + { + if (exp_b10 == 0) *ascii++ = 46, --size; /* counted + above */ + --exp_b10; + } + *ascii++ = (char)(48 + (int)d), ++cdigits; + } + } + while (cdigits+czero-clead < (int)precision && fp > DBL_MIN); + + /* The total output count (max) is now 4+precision */ + + /* Check for an exponent, if we don't need one we are + * done and just need to terminate the string. At + * this point exp_b10==(-1) is effectively if flag - it got + * to '-1' because of the decrement after outputing + * the decimal point above (the exponent required is + * *not* -1!) + */ + if (exp_b10 >= (-1) && exp_b10 <= 2) + { + /* The following only happens if we didn't output the + * leading zeros above for negative exponent, so this + * doest add to the digit requirement. Note that the + * two zeros here can only be output if the two leading + * zeros were *not* output, so this doesn't increase + * the output count. + */ + while (--exp_b10 >= 0) *ascii++ = 48; + + *ascii = 0; + + /* Total buffer requirement (including the '\0') is + * 5+precision - see check at the start. + */ + return; + } + + /* Here if an exponent is required, adjust size for + * the digits we output but did not count. The total + * digit output here so far is at most 1+precision - no + * decimal point and no leading or trailing zeros have + * been output. + */ + size -= cdigits; + + *ascii++ = 69, --size; /* 'E': PLUS 1 TOTAL 2+precision */ + + /* The following use of an unsigned temporary avoids ambiguities in + * the signed arithmetic on exp_b10 and permits GCC at least to do + * better optimization. + */ + { + unsigned int uexp_b10; + + if (exp_b10 < 0) + { + *ascii++ = 45, --size; /* '-': PLUS 1 TOTAL 3+precision */ + uexp_b10 = -exp_b10; + } + + else + uexp_b10 = exp_b10; + + cdigits = 0; + + while (uexp_b10 > 0) + { + exponent[cdigits++] = (char)(48 + uexp_b10 % 10); + uexp_b10 /= 10; + } + } + + /* Need another size check here for the exponent digits, so + * this need not be considered above. + */ + if ((int)size > cdigits) + { + while (cdigits > 0) *ascii++ = exponent[--cdigits]; + + *ascii = 0; + + return; + } + } + } + else if (!(fp >= DBL_MIN)) + { + *ascii++ = 48; /* '0' */ + *ascii = 0; + return; + } + else + { + *ascii++ = 105; /* 'i' */ + *ascii++ = 110; /* 'n' */ + *ascii++ = 102; /* 'f' */ + *ascii = 0; + return; + } + } + + /* Here on buffer too small. */ + png_error(png_ptr, "ASCII conversion buffer too small"); +} + +# endif /* FLOATING_POINT */ + +# ifdef PNG_FIXED_POINT_SUPPORTED +/* Function to format a fixed point value in ASCII. + */ +void /* PRIVATE */ +png_ascii_from_fixed(png_const_structrp png_ptr, png_charp ascii, + png_size_t size, png_fixed_point fp) +{ + /* Require space for 10 decimal digits, a decimal point, a minus sign and a + * trailing \0, 13 characters: + */ + if (size > 12) + { + png_uint_32 num; + + /* Avoid overflow here on the minimum integer. */ + if (fp < 0) + *ascii++ = 45, --size, num = -fp; + else + num = fp; + + if (num <= 0x80000000) /* else overflowed */ + { + unsigned int ndigits = 0, first = 16 /* flag value */; + char digits[10]; + + while (num) + { + /* Split the low digit off num: */ + unsigned int tmp = num/10; + num -= tmp*10; + digits[ndigits++] = (char)(48 + num); + /* Record the first non-zero digit, note that this is a number + * starting at 1, it's not actually the array index. + */ + if (first == 16 && num > 0) + first = ndigits; + num = tmp; + } + + if (ndigits > 0) + { + while (ndigits > 5) *ascii++ = digits[--ndigits]; + /* The remaining digits are fractional digits, ndigits is '5' or + * smaller at this point. It is certainly not zero. Check for a + * non-zero fractional digit: + */ + if (first <= 5) + { + unsigned int i; + *ascii++ = 46; /* decimal point */ + /* ndigits may be <5 for small numbers, output leading zeros + * then ndigits digits to first: + */ + i = 5; + while (ndigits < i) *ascii++ = 48, --i; + while (ndigits >= first) *ascii++ = digits[--ndigits]; + /* Don't output the trailing zeros! */ + } + } + else + *ascii++ = 48; + + /* And null terminate the string: */ + *ascii = 0; + return; + } + } + + /* Here on buffer too small. */ + png_error(png_ptr, "ASCII conversion buffer too small"); +} +# endif /* FIXED_POINT */ +#endif /* READ_SCAL */ + +#if defined(PNG_FLOATING_POINT_SUPPORTED) && \ + !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ + (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ + defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ + defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ + (defined(PNG_sCAL_SUPPORTED) && \ + defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) +png_fixed_point +png_fixed(png_const_structrp png_ptr, double fp, png_const_charp text) +{ + double r = floor(100000 * fp + .5); + + if (r > 2147483647. || r < -2147483648.) + png_fixed_error(png_ptr, text); + + return (png_fixed_point)r; +} +#endif + +#if defined(PNG_READ_GAMMA_SUPPORTED) || \ + defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) +/* muldiv functions */ +/* This API takes signed arguments and rounds the result to the nearest + * integer (or, for a fixed point number - the standard argument - to + * the nearest .00001). Overflow and divide by zero are signalled in + * the result, a boolean - true on success, false on overflow. + */ +int +png_muldiv(png_fixed_point_p res, png_fixed_point a, png_int_32 times, + png_int_32 divisor) +{ + /* Return a * times / divisor, rounded. */ + if (divisor != 0) + { + if (a == 0 || times == 0) + { + *res = 0; + return 1; + } + else + { +#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED + double r = a; + r *= times; + r /= divisor; + r = floor(r+.5); + + /* A png_fixed_point is a 32-bit integer. */ + if (r <= 2147483647. && r >= -2147483648.) + { + *res = (png_fixed_point)r; + return 1; + } +#else + int negative = 0; + png_uint_32 A, T, D; + png_uint_32 s16, s32, s00; + + if (a < 0) + negative = 1, A = -a; + else + A = a; + + if (times < 0) + negative = !negative, T = -times; + else + T = times; + + if (divisor < 0) + negative = !negative, D = -divisor; + else + D = divisor; + + /* Following can't overflow because the arguments only + * have 31 bits each, however the result may be 32 bits. + */ + s16 = (A >> 16) * (T & 0xffff) + + (A & 0xffff) * (T >> 16); + /* Can't overflow because the a*times bit is only 30 + * bits at most. + */ + s32 = (A >> 16) * (T >> 16) + (s16 >> 16); + s00 = (A & 0xffff) * (T & 0xffff); + + s16 = (s16 & 0xffff) << 16; + s00 += s16; + + if (s00 < s16) + ++s32; /* carry */ + + if (s32 < D) /* else overflow */ + { + /* s32.s00 is now the 64-bit product, do a standard + * division, we know that s32 < D, so the maximum + * required shift is 31. + */ + int bitshift = 32; + png_fixed_point result = 0; /* NOTE: signed */ + + while (--bitshift >= 0) + { + png_uint_32 d32, d00; + + if (bitshift > 0) + d32 = D >> (32-bitshift), d00 = D << bitshift; + + else + d32 = 0, d00 = D; + + if (s32 > d32) + { + if (s00 < d00) --s32; /* carry */ + s32 -= d32, s00 -= d00, result += 1<= d00) + s32 = 0, s00 -= d00, result += 1<= (D >> 1)) + ++result; + + if (negative) + result = -result; + + /* Check for overflow. */ + if ((negative && result <= 0) || (!negative && result >= 0)) + { + *res = result; + return 1; + } + } +#endif + } + } + + return 0; +} +#endif /* READ_GAMMA || INCH_CONVERSIONS */ + +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) +/* The following is for when the caller doesn't much care about the + * result. + */ +png_fixed_point +png_muldiv_warn(png_const_structrp png_ptr, png_fixed_point a, png_int_32 times, + png_int_32 divisor) +{ + png_fixed_point result; + + if (png_muldiv(&result, a, times, divisor)) + return result; + + png_warning(png_ptr, "fixed point overflow ignored"); + return 0; +} +#endif + +#ifdef PNG_GAMMA_SUPPORTED /* more fixed point functions for gamma */ +/* Calculate a reciprocal, return 0 on div-by-zero or overflow. */ +png_fixed_point +png_reciprocal(png_fixed_point a) +{ +#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED + double r = floor(1E10/a+.5); + + if (r <= 2147483647. && r >= -2147483648.) + return (png_fixed_point)r; +#else + png_fixed_point res; + + if (png_muldiv(&res, 100000, 100000, a)) + return res; +#endif + + return 0; /* error/overflow */ +} + +/* This is the shared test on whether a gamma value is 'significant' - whether + * it is worth doing gamma correction. + */ +int /* PRIVATE */ +png_gamma_significant(png_fixed_point gamma_val) +{ + return gamma_val < PNG_FP_1 - PNG_GAMMA_THRESHOLD_FIXED || + gamma_val > PNG_FP_1 + PNG_GAMMA_THRESHOLD_FIXED; +} +#endif + +#ifdef PNG_READ_GAMMA_SUPPORTED +/* A local convenience routine. */ +static png_fixed_point +png_product2(png_fixed_point a, png_fixed_point b) +{ + /* The required result is 1/a * 1/b; the following preserves accuracy. */ +#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED + double r = a * 1E-5; + r *= b; + r = floor(r+.5); + + if (r <= 2147483647. && r >= -2147483648.) + return (png_fixed_point)r; +#else + png_fixed_point res; + + if (png_muldiv(&res, a, b, 100000)) + return res; +#endif + + return 0; /* overflow */ +} + +/* The inverse of the above. */ +png_fixed_point +png_reciprocal2(png_fixed_point a, png_fixed_point b) +{ + /* The required result is 1/a * 1/b; the following preserves accuracy. */ +#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED + double r = 1E15/a; + r /= b; + r = floor(r+.5); + + if (r <= 2147483647. && r >= -2147483648.) + return (png_fixed_point)r; +#else + /* This may overflow because the range of png_fixed_point isn't symmetric, + * but this API is only used for the product of file and screen gamma so it + * doesn't matter that the smallest number it can produce is 1/21474, not + * 1/100000 + */ + png_fixed_point res = png_product2(a, b); + + if (res != 0) + return png_reciprocal(res); +#endif + + return 0; /* overflow */ +} +#endif /* READ_GAMMA */ + +#ifdef PNG_READ_GAMMA_SUPPORTED /* gamma table code */ +#ifndef PNG_FLOATING_ARITHMETIC_SUPPORTED +/* Fixed point gamma. + * + * The code to calculate the tables used below can be found in the shell script + * contrib/tools/intgamma.sh + * + * To calculate gamma this code implements fast log() and exp() calls using only + * fixed point arithmetic. This code has sufficient precision for either 8-bit + * or 16-bit sample values. + * + * The tables used here were calculated using simple 'bc' programs, but C double + * precision floating point arithmetic would work fine. + * + * 8-bit log table + * This is a table of -log(value/255)/log(2) for 'value' in the range 128 to + * 255, so it's the base 2 logarithm of a normalized 8-bit floating point + * mantissa. The numbers are 32-bit fractions. + */ +static const png_uint_32 +png_8bit_l2[128] = +{ + 4270715492U, 4222494797U, 4174646467U, 4127164793U, 4080044201U, 4033279239U, + 3986864580U, 3940795015U, 3895065449U, 3849670902U, 3804606499U, 3759867474U, + 3715449162U, 3671346997U, 3627556511U, 3584073329U, 3540893168U, 3498011834U, + 3455425220U, 3413129301U, 3371120137U, 3329393864U, 3287946700U, 3246774933U, + 3205874930U, 3165243125U, 3124876025U, 3084770202U, 3044922296U, 3005329011U, + 2965987113U, 2926893432U, 2888044853U, 2849438323U, 2811070844U, 2772939474U, + 2735041326U, 2697373562U, 2659933400U, 2622718104U, 2585724991U, 2548951424U, + 2512394810U, 2476052606U, 2439922311U, 2404001468U, 2368287663U, 2332778523U, + 2297471715U, 2262364947U, 2227455964U, 2192742551U, 2158222529U, 2123893754U, + 2089754119U, 2055801552U, 2022034013U, 1988449497U, 1955046031U, 1921821672U, + 1888774511U, 1855902668U, 1823204291U, 1790677560U, 1758320682U, 1726131893U, + 1694109454U, 1662251657U, 1630556815U, 1599023271U, 1567649391U, 1536433567U, + 1505374214U, 1474469770U, 1443718700U, 1413119487U, 1382670639U, 1352370686U, + 1322218179U, 1292211689U, 1262349810U, 1232631153U, 1203054352U, 1173618059U, + 1144320946U, 1115161701U, 1086139034U, 1057251672U, 1028498358U, 999877854U, + 971388940U, 943030410U, 914801076U, 886699767U, 858725327U, 830876614U, + 803152505U, 775551890U, 748073672U, 720716771U, 693480120U, 666362667U, + 639363374U, 612481215U, 585715177U, 559064263U, 532527486U, 506103872U, + 479792461U, 453592303U, 427502463U, 401522014U, 375650043U, 349885648U, + 324227938U, 298676034U, 273229066U, 247886176U, 222646516U, 197509248U, + 172473545U, 147538590U, 122703574U, 97967701U, 73330182U, 48790236U, + 24347096U, 0U + +#if 0 + /* The following are the values for 16-bit tables - these work fine for the + * 8-bit conversions but produce very slightly larger errors in the 16-bit + * log (about 1.2 as opposed to 0.7 absolute error in the final value). To + * use these all the shifts below must be adjusted appropriately. + */ + 65166, 64430, 63700, 62976, 62257, 61543, 60835, 60132, 59434, 58741, 58054, + 57371, 56693, 56020, 55352, 54689, 54030, 53375, 52726, 52080, 51439, 50803, + 50170, 49542, 48918, 48298, 47682, 47070, 46462, 45858, 45257, 44661, 44068, + 43479, 42894, 42312, 41733, 41159, 40587, 40020, 39455, 38894, 38336, 37782, + 37230, 36682, 36137, 35595, 35057, 34521, 33988, 33459, 32932, 32408, 31887, + 31369, 30854, 30341, 29832, 29325, 28820, 28319, 27820, 27324, 26830, 26339, + 25850, 25364, 24880, 24399, 23920, 23444, 22970, 22499, 22029, 21562, 21098, + 20636, 20175, 19718, 19262, 18808, 18357, 17908, 17461, 17016, 16573, 16132, + 15694, 15257, 14822, 14390, 13959, 13530, 13103, 12678, 12255, 11834, 11415, + 10997, 10582, 10168, 9756, 9346, 8937, 8531, 8126, 7723, 7321, 6921, 6523, + 6127, 5732, 5339, 4947, 4557, 4169, 3782, 3397, 3014, 2632, 2251, 1872, 1495, + 1119, 744, 372 +#endif +}; + +static png_int_32 +png_log8bit(unsigned int x) +{ + unsigned int lg2 = 0; + /* Each time 'x' is multiplied by 2, 1 must be subtracted off the final log, + * because the log is actually negate that means adding 1. The final + * returned value thus has the range 0 (for 255 input) to 7.994 (for 1 + * input), return -1 for the overflow (log 0) case, - so the result is + * always at most 19 bits. + */ + if ((x &= 0xff) == 0) + return -1; + + if ((x & 0xf0) == 0) + lg2 = 4, x <<= 4; + + if ((x & 0xc0) == 0) + lg2 += 2, x <<= 2; + + if ((x & 0x80) == 0) + lg2 += 1, x <<= 1; + + /* result is at most 19 bits, so this cast is safe: */ + return (png_int_32)((lg2 << 16) + ((png_8bit_l2[x-128]+32768)>>16)); +} + +/* The above gives exact (to 16 binary places) log2 values for 8-bit images, + * for 16-bit images we use the most significant 8 bits of the 16-bit value to + * get an approximation then multiply the approximation by a correction factor + * determined by the remaining up to 8 bits. This requires an additional step + * in the 16-bit case. + * + * We want log2(value/65535), we have log2(v'/255), where: + * + * value = v' * 256 + v'' + * = v' * f + * + * So f is value/v', which is equal to (256+v''/v') since v' is in the range 128 + * to 255 and v'' is in the range 0 to 255 f will be in the range 256 to less + * than 258. The final factor also needs to correct for the fact that our 8-bit + * value is scaled by 255, whereas the 16-bit values must be scaled by 65535. + * + * This gives a final formula using a calculated value 'x' which is value/v' and + * scaling by 65536 to match the above table: + * + * log2(x/257) * 65536 + * + * Since these numbers are so close to '1' we can use simple linear + * interpolation between the two end values 256/257 (result -368.61) and 258/257 + * (result 367.179). The values used below are scaled by a further 64 to give + * 16-bit precision in the interpolation: + * + * Start (256): -23591 + * Zero (257): 0 + * End (258): 23499 + */ +static png_int_32 +png_log16bit(png_uint_32 x) +{ + unsigned int lg2 = 0; + + /* As above, but now the input has 16 bits. */ + if ((x &= 0xffff) == 0) + return -1; + + if ((x & 0xff00) == 0) + lg2 = 8, x <<= 8; + + if ((x & 0xf000) == 0) + lg2 += 4, x <<= 4; + + if ((x & 0xc000) == 0) + lg2 += 2, x <<= 2; + + if ((x & 0x8000) == 0) + lg2 += 1, x <<= 1; + + /* Calculate the base logarithm from the top 8 bits as a 28-bit fractional + * value. + */ + lg2 <<= 28; + lg2 += (png_8bit_l2[(x>>8)-128]+8) >> 4; + + /* Now we need to interpolate the factor, this requires a division by the top + * 8 bits. Do this with maximum precision. + */ + x = ((x << 16) + (x >> 9)) / (x >> 8); + + /* Since we divided by the top 8 bits of 'x' there will be a '1' at 1<<24, + * the value at 1<<16 (ignoring this) will be 0 or 1; this gives us exactly + * 16 bits to interpolate to get the low bits of the result. Round the + * answer. Note that the end point values are scaled by 64 to retain overall + * precision and that 'lg2' is current scaled by an extra 12 bits, so adjust + * the overall scaling by 6-12. Round at every step. + */ + x -= 1U << 24; + + if (x <= 65536U) /* <= '257' */ + lg2 += ((23591U * (65536U-x)) + (1U << (16+6-12-1))) >> (16+6-12); + + else + lg2 -= ((23499U * (x-65536U)) + (1U << (16+6-12-1))) >> (16+6-12); + + /* Safe, because the result can't have more than 20 bits: */ + return (png_int_32)((lg2 + 2048) >> 12); +} + +/* The 'exp()' case must invert the above, taking a 20-bit fixed point + * logarithmic value and returning a 16 or 8-bit number as appropriate. In + * each case only the low 16 bits are relevant - the fraction - since the + * integer bits (the top 4) simply determine a shift. + * + * The worst case is the 16-bit distinction between 65535 and 65534, this + * requires perhaps spurious accuracty in the decoding of the logarithm to + * distinguish log2(65535/65534.5) - 10^-5 or 17 bits. There is little chance + * of getting this accuracy in practice. + * + * To deal with this the following exp() function works out the exponent of the + * frational part of the logarithm by using an accurate 32-bit value from the + * top four fractional bits then multiplying in the remaining bits. + */ +static const png_uint_32 +png_32bit_exp[16] = +{ + /* NOTE: the first entry is deliberately set to the maximum 32-bit value. */ + 4294967295U, 4112874773U, 3938502376U, 3771522796U, 3611622603U, 3458501653U, + 3311872529U, 3171459999U, 3037000500U, 2908241642U, 2784941738U, 2666869345U, + 2553802834U, 2445529972U, 2341847524U, 2242560872U +}; + +/* Adjustment table; provided to explain the numbers in the code below. */ +#if 0 +for (i=11;i>=0;--i){ print i, " ", (1 - e(-(2^i)/65536*l(2))) * 2^(32-i), "\n"} + 11 44937.64284865548751208448 + 10 45180.98734845585101160448 + 9 45303.31936980687359311872 + 8 45364.65110595323018870784 + 7 45395.35850361789624614912 + 6 45410.72259715102037508096 + 5 45418.40724413220722311168 + 4 45422.25021786898173001728 + 3 45424.17186732298419044352 + 2 45425.13273269940811464704 + 1 45425.61317555035558641664 + 0 45425.85339951654943850496 +#endif + +static png_uint_32 +png_exp(png_fixed_point x) +{ + if (x > 0 && x <= 0xfffff) /* Else overflow or zero (underflow) */ + { + /* Obtain a 4-bit approximation */ + png_uint_32 e = png_32bit_exp[(x >> 12) & 0xf]; + + /* Incorporate the low 12 bits - these decrease the returned value by + * multiplying by a number less than 1 if the bit is set. The multiplier + * is determined by the above table and the shift. Notice that the values + * converge on 45426 and this is used to allow linear interpolation of the + * low bits. + */ + if (x & 0x800) + e -= (((e >> 16) * 44938U) + 16U) >> 5; + + if (x & 0x400) + e -= (((e >> 16) * 45181U) + 32U) >> 6; + + if (x & 0x200) + e -= (((e >> 16) * 45303U) + 64U) >> 7; + + if (x & 0x100) + e -= (((e >> 16) * 45365U) + 128U) >> 8; + + if (x & 0x080) + e -= (((e >> 16) * 45395U) + 256U) >> 9; + + if (x & 0x040) + e -= (((e >> 16) * 45410U) + 512U) >> 10; + + /* And handle the low 6 bits in a single block. */ + e -= (((e >> 16) * 355U * (x & 0x3fU)) + 256U) >> 9; + + /* Handle the upper bits of x. */ + e >>= x >> 16; + return e; + } + + /* Check for overflow */ + if (x <= 0) + return png_32bit_exp[0]; + + /* Else underflow */ + return 0; +} + +static png_byte +png_exp8bit(png_fixed_point lg2) +{ + /* Get a 32-bit value: */ + png_uint_32 x = png_exp(lg2); + + /* Convert the 32-bit value to 0..255 by multiplying by 256-1, note that the + * second, rounding, step can't overflow because of the first, subtraction, + * step. + */ + x -= x >> 8; + return (png_byte)((x + 0x7fffffU) >> 24); +} + +static png_uint_16 +png_exp16bit(png_fixed_point lg2) +{ + /* Get a 32-bit value: */ + png_uint_32 x = png_exp(lg2); + + /* Convert the 32-bit value to 0..65535 by multiplying by 65536-1: */ + x -= x >> 16; + return (png_uint_16)((x + 32767U) >> 16); +} +#endif /* FLOATING_ARITHMETIC */ + +png_byte +png_gamma_8bit_correct(unsigned int value, png_fixed_point gamma_val) +{ + if (value > 0 && value < 255) + { +# ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED + double r = floor(255*pow(value/255.,gamma_val*.00001)+.5); + return (png_byte)r; +# else + png_int_32 lg2 = png_log8bit(value); + png_fixed_point res; + + if (png_muldiv(&res, gamma_val, lg2, PNG_FP_1)) + return png_exp8bit(res); + + /* Overflow. */ + value = 0; +# endif + } + + return (png_byte)value; +} + +png_uint_16 +png_gamma_16bit_correct(unsigned int value, png_fixed_point gamma_val) +{ + if (value > 0 && value < 65535) + { +# ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED + double r = floor(65535*pow(value/65535.,gamma_val*.00001)+.5); + return (png_uint_16)r; +# else + png_int_32 lg2 = png_log16bit(value); + png_fixed_point res; + + if (png_muldiv(&res, gamma_val, lg2, PNG_FP_1)) + return png_exp16bit(res); + + /* Overflow. */ + value = 0; +# endif + } + + return (png_uint_16)value; +} + +/* This does the right thing based on the bit_depth field of the + * png_struct, interpreting values as 8-bit or 16-bit. While the result + * is nominally a 16-bit value if bit depth is 8 then the result is + * 8-bit (as are the arguments.) + */ +png_uint_16 /* PRIVATE */ +png_gamma_correct(png_structrp png_ptr, unsigned int value, + png_fixed_point gamma_val) +{ + if (png_ptr->bit_depth == 8) + return png_gamma_8bit_correct(value, gamma_val); + + else + return png_gamma_16bit_correct(value, gamma_val); +} + +/* Internal function to build a single 16-bit table - the table consists of + * 'num' 256 entry subtables, where 'num' is determined by 'shift' - the amount + * to shift the input values right (or 16-number_of_signifiant_bits). + * + * The caller is responsible for ensuring that the table gets cleaned up on + * png_error (i.e. if one of the mallocs below fails) - i.e. the *table argument + * should be somewhere that will be cleaned. + */ +static void +png_build_16bit_table(png_structrp png_ptr, png_uint_16pp *ptable, + PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val) +{ + /* Various values derived from 'shift': */ + PNG_CONST unsigned int num = 1U << (8U - shift); + PNG_CONST unsigned int max = (1U << (16U - shift))-1U; + PNG_CONST unsigned int max_by_2 = 1U << (15U-shift); + unsigned int i; + + png_uint_16pp table = *ptable = + (png_uint_16pp)png_calloc(png_ptr, num * (sizeof (png_uint_16p))); + + for (i = 0; i < num; i++) + { + png_uint_16p sub_table = table[i] = + (png_uint_16p)png_malloc(png_ptr, 256 * (sizeof (png_uint_16))); + + /* The 'threshold' test is repeated here because it can arise for one of + * the 16-bit tables even if the others don't hit it. + */ + if (png_gamma_significant(gamma_val)) + { + /* The old code would overflow at the end and this would cause the + * 'pow' function to return a result >1, resulting in an + * arithmetic error. This code follows the spec exactly; ig is + * the recovered input sample, it always has 8-16 bits. + * + * We want input * 65535/max, rounded, the arithmetic fits in 32 + * bits (unsigned) so long as max <= 32767. + */ + unsigned int j; + for (j = 0; j < 256; j++) + { + png_uint_32 ig = (j << (8-shift)) + i; +# ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED + /* Inline the 'max' scaling operation: */ + double d = floor(65535*pow(ig/(double)max, gamma_val*.00001)+.5); + sub_table[j] = (png_uint_16)d; +# else + if (shift) + ig = (ig * 65535U + max_by_2)/max; + + sub_table[j] = png_gamma_16bit_correct(ig, gamma_val); +# endif + } + } + else + { + /* We must still build a table, but do it the fast way. */ + unsigned int j; + + for (j = 0; j < 256; j++) + { + png_uint_32 ig = (j << (8-shift)) + i; + + if (shift) + ig = (ig * 65535U + max_by_2)/max; + + sub_table[j] = (png_uint_16)ig; + } + } + } +} + +/* NOTE: this function expects the *inverse* of the overall gamma transformation + * required. + */ +static void +png_build_16to8_table(png_structrp png_ptr, png_uint_16pp *ptable, + PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val) +{ + PNG_CONST unsigned int num = 1U << (8U - shift); + PNG_CONST unsigned int max = (1U << (16U - shift))-1U; + unsigned int i; + png_uint_32 last; + + png_uint_16pp table = *ptable = + (png_uint_16pp)png_calloc(png_ptr, num * (sizeof (png_uint_16p))); + + /* 'num' is the number of tables and also the number of low bits of low + * bits of the input 16-bit value used to select a table. Each table is + * itself index by the high 8 bits of the value. + */ + for (i = 0; i < num; i++) + table[i] = (png_uint_16p)png_malloc(png_ptr, + 256 * (sizeof (png_uint_16))); + + /* 'gamma_val' is set to the reciprocal of the value calculated above, so + * pow(out,g) is an *input* value. 'last' is the last input value set. + * + * In the loop 'i' is used to find output values. Since the output is + * 8-bit there are only 256 possible values. The tables are set up to + * select the closest possible output value for each input by finding + * the input value at the boundary between each pair of output values + * and filling the table up to that boundary with the lower output + * value. + * + * The boundary values are 0.5,1.5..253.5,254.5. Since these are 9-bit + * values the code below uses a 16-bit value in i; the values start at + * 128.5 (for 0.5) and step by 257, for a total of 254 values (the last + * entries are filled with 255). Start i at 128 and fill all 'last' + * table entries <= 'max' + */ + last = 0; + for (i = 0; i < 255; ++i) /* 8-bit output value */ + { + /* Find the corresponding maximum input value */ + png_uint_16 out = (png_uint_16)(i * 257U); /* 16-bit output value */ + + /* Find the boundary value in 16 bits: */ + png_uint_32 bound = png_gamma_16bit_correct(out+128U, gamma_val); + + /* Adjust (round) to (16-shift) bits: */ + bound = (bound * max + 32768U)/65535U + 1U; + + while (last < bound) + { + table[last & (0xffU >> shift)][last >> (8U - shift)] = out; + last++; + } + } + + /* And fill in the final entries. */ + while (last < (num << 8)) + { + table[last & (0xff >> shift)][last >> (8U - shift)] = 65535U; + last++; + } +} + +/* Build a single 8-bit table: same as the 16-bit case but much simpler (and + * typically much faster). Note that libpng currently does no sBIT processing + * (apparently contrary to the spec) so a 256 entry table is always generated. + */ +static void +png_build_8bit_table(png_structrp png_ptr, png_bytepp ptable, + PNG_CONST png_fixed_point gamma_val) +{ + unsigned int i; + png_bytep table = *ptable = (png_bytep)png_malloc(png_ptr, 256); + + if (png_gamma_significant(gamma_val)) for (i=0; i<256; i++) + table[i] = png_gamma_8bit_correct(i, gamma_val); + + else for (i=0; i<256; ++i) + table[i] = (png_byte)i; +} + +/* Used from png_read_destroy and below to release the memory used by the gamma + * tables. + */ +void /* PRIVATE */ +png_destroy_gamma_table(png_structrp png_ptr) +{ + png_free(png_ptr, png_ptr->gamma_table); + png_ptr->gamma_table = NULL; + + if (png_ptr->gamma_16_table != NULL) + { + int i; + int istop = (1 << (8 - png_ptr->gamma_shift)); + for (i = 0; i < istop; i++) + { + png_free(png_ptr, png_ptr->gamma_16_table[i]); + } + png_free(png_ptr, png_ptr->gamma_16_table); + png_ptr->gamma_16_table = NULL; + } + +#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ + defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \ + defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) + png_free(png_ptr, png_ptr->gamma_from_1); + png_ptr->gamma_from_1 = NULL; + png_free(png_ptr, png_ptr->gamma_to_1); + png_ptr->gamma_to_1 = NULL; + + if (png_ptr->gamma_16_from_1 != NULL) + { + int i; + int istop = (1 << (8 - png_ptr->gamma_shift)); + for (i = 0; i < istop; i++) + { + png_free(png_ptr, png_ptr->gamma_16_from_1[i]); + } + png_free(png_ptr, png_ptr->gamma_16_from_1); + png_ptr->gamma_16_from_1 = NULL; + } + if (png_ptr->gamma_16_to_1 != NULL) + { + int i; + int istop = (1 << (8 - png_ptr->gamma_shift)); + for (i = 0; i < istop; i++) + { + png_free(png_ptr, png_ptr->gamma_16_to_1[i]); + } + png_free(png_ptr, png_ptr->gamma_16_to_1); + png_ptr->gamma_16_to_1 = NULL; + } +#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */ +} + +/* We build the 8- or 16-bit gamma tables here. Note that for 16-bit + * tables, we don't make a full table if we are reducing to 8-bit in + * the future. Note also how the gamma_16 tables are segmented so that + * we don't need to allocate > 64K chunks for a full 16-bit table. + */ +void /* PRIVATE */ +png_build_gamma_table(png_structrp png_ptr, int bit_depth) +{ + png_debug(1, "in png_build_gamma_table"); + + /* Remove any existing table; this copes with multiple calls to + * png_read_update_info. The warning is because building the gamma tables + * multiple times is a performance hit - it's harmless but the ability to call + * png_read_update_info() multiple times is new in 1.5.6 so it seems sensible + * to warn if the app introduces such a hit. + */ + if (png_ptr->gamma_table != NULL || png_ptr->gamma_16_table != NULL) + { + png_warning(png_ptr, "gamma table being rebuilt"); + png_destroy_gamma_table(png_ptr); + } + + if (bit_depth <= 8) + { + png_build_8bit_table(png_ptr, &png_ptr->gamma_table, + png_ptr->screen_gamma > 0 ? png_reciprocal2(png_ptr->colorspace.gamma, + png_ptr->screen_gamma) : PNG_FP_1); + +#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ + defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \ + defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) + if (png_ptr->transformations & (PNG_COMPOSE | PNG_RGB_TO_GRAY)) + { + png_build_8bit_table(png_ptr, &png_ptr->gamma_to_1, + png_reciprocal(png_ptr->colorspace.gamma)); + + png_build_8bit_table(png_ptr, &png_ptr->gamma_from_1, + png_ptr->screen_gamma > 0 ? png_reciprocal(png_ptr->screen_gamma) : + png_ptr->colorspace.gamma/* Probably doing rgb_to_gray */); + } +#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */ + } + else + { + png_byte shift, sig_bit; + + if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) + { + sig_bit = png_ptr->sig_bit.red; + + if (png_ptr->sig_bit.green > sig_bit) + sig_bit = png_ptr->sig_bit.green; + + if (png_ptr->sig_bit.blue > sig_bit) + sig_bit = png_ptr->sig_bit.blue; + } + else + sig_bit = png_ptr->sig_bit.gray; + + /* 16-bit gamma code uses this equation: + * + * ov = table[(iv & 0xff) >> gamma_shift][iv >> 8] + * + * Where 'iv' is the input color value and 'ov' is the output value - + * pow(iv, gamma). + * + * Thus the gamma table consists of up to 256 256 entry tables. The table + * is selected by the (8-gamma_shift) most significant of the low 8 bits of + * the color value then indexed by the upper 8 bits: + * + * table[low bits][high 8 bits] + * + * So the table 'n' corresponds to all those 'iv' of: + * + * ..<(n+1 << gamma_shift)-1> + * + */ + if (sig_bit > 0 && sig_bit < 16U) + shift = (png_byte)(16U - sig_bit); /* shift == insignificant bits */ + + else + shift = 0; /* keep all 16 bits */ + + if (png_ptr->transformations & (PNG_16_TO_8 | PNG_SCALE_16_TO_8)) + { + /* PNG_MAX_GAMMA_8 is the number of bits to keep - effectively + * the significant bits in the *input* when the output will + * eventually be 8 bits. By default it is 11. + */ + if (shift < (16U - PNG_MAX_GAMMA_8)) + shift = (16U - PNG_MAX_GAMMA_8); + } + + if (shift > 8U) + shift = 8U; /* Guarantees at least one table! */ + + png_ptr->gamma_shift = shift; + +#ifdef PNG_16BIT_SUPPORTED + /* NOTE: prior to 1.5.4 this test used to include PNG_BACKGROUND (now + * PNG_COMPOSE). This effectively smashed the background calculation for + * 16-bit output because the 8-bit table assumes the result will be reduced + * to 8 bits. + */ + if (png_ptr->transformations & (PNG_16_TO_8 | PNG_SCALE_16_TO_8)) +#endif + png_build_16to8_table(png_ptr, &png_ptr->gamma_16_table, shift, + png_ptr->screen_gamma > 0 ? png_product2(png_ptr->colorspace.gamma, + png_ptr->screen_gamma) : PNG_FP_1); + +#ifdef PNG_16BIT_SUPPORTED + else + png_build_16bit_table(png_ptr, &png_ptr->gamma_16_table, shift, + png_ptr->screen_gamma > 0 ? png_reciprocal2(png_ptr->colorspace.gamma, + png_ptr->screen_gamma) : PNG_FP_1); +#endif + +#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ + defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \ + defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) + if (png_ptr->transformations & (PNG_COMPOSE | PNG_RGB_TO_GRAY)) + { + png_build_16bit_table(png_ptr, &png_ptr->gamma_16_to_1, shift, + png_reciprocal(png_ptr->colorspace.gamma)); + + /* Notice that the '16 from 1' table should be full precision, however + * the lookup on this table still uses gamma_shift, so it can't be. + * TODO: fix this. + */ + png_build_16bit_table(png_ptr, &png_ptr->gamma_16_from_1, shift, + png_ptr->screen_gamma > 0 ? png_reciprocal(png_ptr->screen_gamma) : + png_ptr->colorspace.gamma/* Probably doing rgb_to_gray */); + } +#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */ + } +} +#endif /* READ_GAMMA */ + +/* HARDWARE OPTION SUPPORT */ +#ifdef PNG_SET_OPTION_SUPPORTED +int PNGAPI +png_set_option(png_structrp png_ptr, int option, int onoff) +{ + if (png_ptr != NULL && option >= 0 && option < PNG_OPTION_NEXT && + (option & 1) == 0) + { + int mask = 3 << option; + int setting = (2 + (onoff != 0)) << option; + int current = png_ptr->options; + + png_ptr->options = (png_byte)((current & ~mask) | setting); + + return (current & mask) >> option; + } + + return PNG_OPTION_INVALID; +} +#endif + +/* sRGB support */ +#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ + defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) +/* sRGB conversion tables; these are machine generated with the code in + * contrib/tools/makesRGB.c. The actual sRGB transfer curve defined in the + * specification (see the article at http://en.wikipedia.org/wiki/SRGB) + * is used, not the gamma=1/2.2 approximation use elsewhere in libpng. + * The sRGB to linear table is exact (to the nearest 16 bit linear fraction). + * The inverse (linear to sRGB) table has accuracies as follows: + * + * For all possible (255*65535+1) input values: + * + * error: -0.515566 - 0.625971, 79441 (0.475369%) of readings inexact + * + * For the input values corresponding to the 65536 16-bit values: + * + * error: -0.513727 - 0.607759, 308 (0.469978%) of readings inexact + * + * In all cases the inexact readings are off by one. + */ + +#ifdef PNG_SIMPLIFIED_READ_SUPPORTED +/* The convert-to-sRGB table is only currently required for read. */ +const png_uint_16 png_sRGB_table[256] = +{ + 0,20,40,60,80,99,119,139, + 159,179,199,219,241,264,288,313, + 340,367,396,427,458,491,526,562, + 599,637,677,718,761,805,851,898, + 947,997,1048,1101,1156,1212,1270,1330, + 1391,1453,1517,1583,1651,1720,1790,1863, + 1937,2013,2090,2170,2250,2333,2418,2504, + 2592,2681,2773,2866,2961,3058,3157,3258, + 3360,3464,3570,3678,3788,3900,4014,4129, + 4247,4366,4488,4611,4736,4864,4993,5124, + 5257,5392,5530,5669,5810,5953,6099,6246, + 6395,6547,6700,6856,7014,7174,7335,7500, + 7666,7834,8004,8177,8352,8528,8708,8889, + 9072,9258,9445,9635,9828,10022,10219,10417, + 10619,10822,11028,11235,11446,11658,11873,12090, + 12309,12530,12754,12980,13209,13440,13673,13909, + 14146,14387,14629,14874,15122,15371,15623,15878, + 16135,16394,16656,16920,17187,17456,17727,18001, + 18277,18556,18837,19121,19407,19696,19987,20281, + 20577,20876,21177,21481,21787,22096,22407,22721, + 23038,23357,23678,24002,24329,24658,24990,25325, + 25662,26001,26344,26688,27036,27386,27739,28094, + 28452,28813,29176,29542,29911,30282,30656,31033, + 31412,31794,32179,32567,32957,33350,33745,34143, + 34544,34948,35355,35764,36176,36591,37008,37429, + 37852,38278,38706,39138,39572,40009,40449,40891, + 41337,41785,42236,42690,43147,43606,44069,44534, + 45002,45473,45947,46423,46903,47385,47871,48359, + 48850,49344,49841,50341,50844,51349,51858,52369, + 52884,53401,53921,54445,54971,55500,56032,56567, + 57105,57646,58190,58737,59287,59840,60396,60955, + 61517,62082,62650,63221,63795,64372,64952,65535 +}; + +#endif /* simplified read only */ + +/* The base/delta tables are required for both read and write (but currently + * only the simplified versions.) + */ +const png_uint_16 png_sRGB_base[512] = +{ + 128,1782,3383,4644,5675,6564,7357,8074, + 8732,9346,9921,10463,10977,11466,11935,12384, + 12816,13233,13634,14024,14402,14769,15125,15473, + 15812,16142,16466,16781,17090,17393,17690,17981, + 18266,18546,18822,19093,19359,19621,19879,20133, + 20383,20630,20873,21113,21349,21583,21813,22041, + 22265,22487,22707,22923,23138,23350,23559,23767, + 23972,24175,24376,24575,24772,24967,25160,25352, + 25542,25730,25916,26101,26284,26465,26645,26823, + 27000,27176,27350,27523,27695,27865,28034,28201, + 28368,28533,28697,28860,29021,29182,29341,29500, + 29657,29813,29969,30123,30276,30429,30580,30730, + 30880,31028,31176,31323,31469,31614,31758,31902, + 32045,32186,32327,32468,32607,32746,32884,33021, + 33158,33294,33429,33564,33697,33831,33963,34095, + 34226,34357,34486,34616,34744,34873,35000,35127, + 35253,35379,35504,35629,35753,35876,35999,36122, + 36244,36365,36486,36606,36726,36845,36964,37083, + 37201,37318,37435,37551,37668,37783,37898,38013, + 38127,38241,38354,38467,38580,38692,38803,38915, + 39026,39136,39246,39356,39465,39574,39682,39790, + 39898,40005,40112,40219,40325,40431,40537,40642, + 40747,40851,40955,41059,41163,41266,41369,41471, + 41573,41675,41777,41878,41979,42079,42179,42279, + 42379,42478,42577,42676,42775,42873,42971,43068, + 43165,43262,43359,43456,43552,43648,43743,43839, + 43934,44028,44123,44217,44311,44405,44499,44592, + 44685,44778,44870,44962,45054,45146,45238,45329, + 45420,45511,45601,45692,45782,45872,45961,46051, + 46140,46229,46318,46406,46494,46583,46670,46758, + 46846,46933,47020,47107,47193,47280,47366,47452, + 47538,47623,47709,47794,47879,47964,48048,48133, + 48217,48301,48385,48468,48552,48635,48718,48801, + 48884,48966,49048,49131,49213,49294,49376,49458, + 49539,49620,49701,49782,49862,49943,50023,50103, + 50183,50263,50342,50422,50501,50580,50659,50738, + 50816,50895,50973,51051,51129,51207,51285,51362, + 51439,51517,51594,51671,51747,51824,51900,51977, + 52053,52129,52205,52280,52356,52432,52507,52582, + 52657,52732,52807,52881,52956,53030,53104,53178, + 53252,53326,53400,53473,53546,53620,53693,53766, + 53839,53911,53984,54056,54129,54201,54273,54345, + 54417,54489,54560,54632,54703,54774,54845,54916, + 54987,55058,55129,55199,55269,55340,55410,55480, + 55550,55620,55689,55759,55828,55898,55967,56036, + 56105,56174,56243,56311,56380,56448,56517,56585, + 56653,56721,56789,56857,56924,56992,57059,57127, + 57194,57261,57328,57395,57462,57529,57595,57662, + 57728,57795,57861,57927,57993,58059,58125,58191, + 58256,58322,58387,58453,58518,58583,58648,58713, + 58778,58843,58908,58972,59037,59101,59165,59230, + 59294,59358,59422,59486,59549,59613,59677,59740, + 59804,59867,59930,59993,60056,60119,60182,60245, + 60308,60370,60433,60495,60558,60620,60682,60744, + 60806,60868,60930,60992,61054,61115,61177,61238, + 61300,61361,61422,61483,61544,61605,61666,61727, + 61788,61848,61909,61969,62030,62090,62150,62211, + 62271,62331,62391,62450,62510,62570,62630,62689, + 62749,62808,62867,62927,62986,63045,63104,63163, + 63222,63281,63340,63398,63457,63515,63574,63632, + 63691,63749,63807,63865,63923,63981,64039,64097, + 64155,64212,64270,64328,64385,64443,64500,64557, + 64614,64672,64729,64786,64843,64900,64956,65013, + 65070,65126,65183,65239,65296,65352,65409,65465 +}; + +const png_byte png_sRGB_delta[512] = +{ + 207,201,158,129,113,100,90,82,77,72,68,64,61,59,56,54, + 52,50,49,47,46,45,43,42,41,40,39,39,38,37,36,36, + 35,34,34,33,33,32,32,31,31,30,30,30,29,29,28,28, + 28,27,27,27,27,26,26,26,25,25,25,25,24,24,24,24, + 23,23,23,23,23,22,22,22,22,22,22,21,21,21,21,21, + 21,20,20,20,20,20,20,20,20,19,19,19,19,19,19,19, + 19,18,18,18,18,18,18,18,18,18,18,17,17,17,17,17, + 17,17,17,17,17,17,16,16,16,16,16,16,16,16,16,16, + 16,16,16,16,15,15,15,15,15,15,15,15,15,15,15,15, + 15,15,15,15,14,14,14,14,14,14,14,14,14,14,14,14, + 14,14,14,14,14,14,14,13,13,13,13,13,13,13,13,13, + 13,13,13,13,13,13,13,13,13,13,13,13,13,13,12,12, + 12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12, + 12,12,12,12,12,12,12,12,12,12,12,12,11,11,11,11, + 11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11, + 11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11, + 11,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10, + 10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10, + 10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10, + 10,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7 +}; +#endif /* SIMPLIFIED READ/WRITE sRGB support */ + +/* SIMPLIFIED READ/WRITE SUPPORT */ +#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ + defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) +static int +png_image_free_function(png_voidp argument) +{ + png_imagep image = png_voidcast(png_imagep, argument); + png_controlp cp = image->opaque; + png_control c; + + /* Double check that we have a png_ptr - it should be impossible to get here + * without one. + */ + if (cp->png_ptr == NULL) + return 0; + + /* First free any data held in the control structure. */ +# ifdef PNG_STDIO_SUPPORTED + if (cp->owned_file) + { + FILE *fp = png_voidcast(FILE*, cp->png_ptr->io_ptr); + cp->owned_file = 0; + + /* Ignore errors here. */ + if (fp != NULL) + { + cp->png_ptr->io_ptr = NULL; + (void)fclose(fp); + } + } +# endif + + /* Copy the control structure so that the original, allocated, version can be + * safely freed. Notice that a png_error here stops the remainder of the + * cleanup, but this is probably fine because that would indicate bad memory + * problems anyway. + */ + c = *cp; + image->opaque = &c; + png_free(c.png_ptr, cp); + + /* Then the structures, calling the correct API. */ + if (c.for_write) + { +# ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED + png_destroy_write_struct(&c.png_ptr, &c.info_ptr); +# else + png_error(c.png_ptr, "simplified write not supported"); +# endif + } + else + { +# ifdef PNG_SIMPLIFIED_READ_SUPPORTED + png_destroy_read_struct(&c.png_ptr, &c.info_ptr, NULL); +# else + png_error(c.png_ptr, "simplified read not supported"); +# endif + } + + /* Success. */ + return 1; +} + +void PNGAPI +png_image_free(png_imagep image) +{ + /* Safely call the real function, but only if doing so is safe at this point + * (if not inside an error handling context). Otherwise assume + * png_safe_execute will call this API after the return. + */ + if (image != NULL && image->opaque != NULL && + image->opaque->error_buf == NULL) + { + /* Ignore errors here: */ + (void)png_safe_execute(image, png_image_free_function, image); + image->opaque = NULL; + } +} + +int /* PRIVATE */ +png_image_error(png_imagep image, png_const_charp error_message) +{ + /* Utility to log an error. */ + png_safecat(image->message, (sizeof image->message), 0, error_message); + image->warning_or_error |= PNG_IMAGE_ERROR; + png_image_free(image); + return 0; +} + +#endif /* SIMPLIFIED READ/WRITE */ #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ diff --git a/project/jni/png/pngerror.c b/project/jni/png/pngerror.c index aede2fd9d..f469206ee 100644 --- a/project/jni/png/pngerror.c +++ b/project/jni/png/pngerror.c @@ -1,8 +1,8 @@ /* pngerror.c - stub functions for i/o and memory allocation * - * Last changed in libpng 1.4.6 [January 23, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.1 [March 28, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -16,18 +16,17 @@ * at each function. */ -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" -#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) #include "pngpriv.h" -static void /* PRIVATE */ -png_default_error PNGARG((png_structp png_ptr, - png_const_charp error_message)) PNG_NORETURN; +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) + +static PNG_FUNCTION(void, png_default_error,PNGARG((png_const_structrp png_ptr, + png_const_charp error_message)),PNG_NORETURN); + #ifdef PNG_WARNINGS_SUPPORTED static void /* PRIVATE */ -png_default_warning PNGARG((png_structp png_ptr, - png_const_charp warning_message)); +png_default_warning PNGARG((png_const_structrp png_ptr, + png_const_charp warning_message)); #endif /* PNG_WARNINGS_SUPPORTED */ /* This function is called whenever there is a fatal error. This function @@ -36,66 +35,177 @@ png_default_warning PNGARG((png_structp png_ptr, * to replace the error function at run-time. */ #ifdef PNG_ERROR_TEXT_SUPPORTED -void PNGAPI -png_error(png_structp png_ptr, png_const_charp error_message) +PNG_FUNCTION(void,PNGAPI +png_error,(png_const_structrp png_ptr, png_const_charp error_message), + PNG_NORETURN) { #ifdef PNG_ERROR_NUMBERS_SUPPORTED char msg[16]; if (png_ptr != NULL) { - if (png_ptr->flags& - (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) - { - if (*error_message == PNG_LITERAL_SHARP) - { - /* Strip "#nnnn " from beginning of error message. */ - int offset; - for (offset = 1; offset<15; offset++) - if (error_message[offset] == ' ') + if (png_ptr->flags& + (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) + { + if (*error_message == PNG_LITERAL_SHARP) + { + /* Strip "#nnnn " from beginning of error message. */ + int offset; + for (offset = 1; offset<15; offset++) + if (error_message[offset] == ' ') break; - if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) - { - int i; - for (i = 0; i < offset - 1; i++) - msg[i] = error_message[i + 1]; - msg[i - 1] = '\0'; - error_message = msg; - } - else - error_message += offset; - } - else - { - if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) - { - msg[0] = '0'; - msg[1] = '\0'; - error_message = msg; - } + + if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) + { + int i; + for (i = 0; i < offset - 1; i++) + msg[i] = error_message[i + 1]; + msg[i - 1] = '\0'; + error_message = msg; + } + + else + error_message += offset; + } + + else + { + if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) + { + msg[0] = '0'; + msg[1] = '\0'; + error_message = msg; + } } } } #endif if (png_ptr != NULL && png_ptr->error_fn != NULL) - (*(png_ptr->error_fn))(png_ptr, error_message); + (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr), + error_message); /* If the custom handler doesn't exist, or if it returns, use the default handler, which will not return. */ png_default_error(png_ptr, error_message); } #else -void PNGAPI -png_err(png_structp png_ptr) +PNG_FUNCTION(void,PNGAPI +png_err,(png_const_structrp png_ptr),PNG_NORETURN) { + /* Prior to 1.5.2 the error_fn received a NULL pointer, expressed + * erroneously as '\0', instead of the empty string "". This was + * apparently an error, introduced in libpng-1.2.20, and png_default_error + * will crash in this case. + */ if (png_ptr != NULL && png_ptr->error_fn != NULL) - (*(png_ptr->error_fn))(png_ptr, '\0'); + (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr), ""); /* If the custom handler doesn't exist, or if it returns, use the default handler, which will not return. */ - png_default_error(png_ptr, '\0'); + png_default_error(png_ptr, ""); } #endif /* PNG_ERROR_TEXT_SUPPORTED */ +/* Utility to safely appends strings to a buffer. This never errors out so + * error checking is not required in the caller. + */ +size_t +png_safecat(png_charp buffer, size_t bufsize, size_t pos, + png_const_charp string) +{ + if (buffer != NULL && pos < bufsize) + { + if (string != NULL) + while (*string != '\0' && pos < bufsize-1) + buffer[pos++] = *string++; + + buffer[pos] = '\0'; + } + + return pos; +} + +#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) +/* Utility to dump an unsigned value into a buffer, given a start pointer and + * and end pointer (which should point just *beyond* the end of the buffer!) + * Returns the pointer to the start of the formatted string. + */ +png_charp +png_format_number(png_const_charp start, png_charp end, int format, + png_alloc_size_t number) +{ + int count = 0; /* number of digits output */ + int mincount = 1; /* minimum number required */ + int output = 0; /* digit output (for the fixed point format) */ + + *--end = '\0'; + + /* This is written so that the loop always runs at least once, even with + * number zero. + */ + while (end > start && (number != 0 || count < mincount)) + { + + static const char digits[] = "0123456789ABCDEF"; + + switch (format) + { + case PNG_NUMBER_FORMAT_fixed: + /* Needs five digits (the fraction) */ + mincount = 5; + if (output || number % 10 != 0) + { + *--end = digits[number % 10]; + output = 1; + } + number /= 10; + break; + + case PNG_NUMBER_FORMAT_02u: + /* Expects at least 2 digits. */ + mincount = 2; + /* FALL THROUGH */ + + case PNG_NUMBER_FORMAT_u: + *--end = digits[number % 10]; + number /= 10; + break; + + case PNG_NUMBER_FORMAT_02x: + /* This format expects at least two digits */ + mincount = 2; + /* FALL THROUGH */ + + case PNG_NUMBER_FORMAT_x: + *--end = digits[number & 0xf]; + number >>= 4; + break; + + default: /* an error */ + number = 0; + break; + } + + /* Keep track of the number of digits added */ + ++count; + + /* Float a fixed number here: */ + if (format == PNG_NUMBER_FORMAT_fixed) if (count == 5) if (end > start) + { + /* End of the fraction, but maybe nothing was output? In that case + * drop the decimal point. If the number is a true zero handle that + * here. + */ + if (output) + *--end = '.'; + else if (number == 0) /* and !output */ + *--end = '0'; + } + } + + return end; +} +#endif + #ifdef PNG_WARNINGS_SUPPORTED /* This function is called whenever there is a non-fatal error. This function * should not be changed. If there is a need to handle warnings differently, @@ -103,41 +213,195 @@ png_err(png_structp png_ptr) * png_set_error_fn() to replace the warning function at run-time. */ void PNGAPI -png_warning(png_structp png_ptr, png_const_charp warning_message) +png_warning(png_const_structrp png_ptr, png_const_charp warning_message) { int offset = 0; if (png_ptr != NULL) { #ifdef PNG_ERROR_NUMBERS_SUPPORTED if (png_ptr->flags& - (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) + (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) #endif - { - if (*warning_message == PNG_LITERAL_SHARP) - { - for (offset = 1; offset < 15; offset++) - if (warning_message[offset] == ' ') + { + if (*warning_message == PNG_LITERAL_SHARP) + { + for (offset = 1; offset < 15; offset++) + if (warning_message[offset] == ' ') break; - } - } + } + } } if (png_ptr != NULL && png_ptr->warning_fn != NULL) - (*(png_ptr->warning_fn))(png_ptr, warning_message + offset); + (*(png_ptr->warning_fn))(png_constcast(png_structrp,png_ptr), + warning_message + offset); else png_default_warning(png_ptr, warning_message + offset); } + +/* These functions support 'formatted' warning messages with up to + * PNG_WARNING_PARAMETER_COUNT parameters. In the format string the parameter + * is introduced by @, where 'number' starts at 1. This follows the + * standard established by X/Open for internationalizable error messages. + */ +void +png_warning_parameter(png_warning_parameters p, int number, + png_const_charp string) +{ + if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT) + (void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string); +} + +void +png_warning_parameter_unsigned(png_warning_parameters p, int number, int format, + png_alloc_size_t value) +{ + char buffer[PNG_NUMBER_BUFFER_SIZE]; + png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value)); +} + +void +png_warning_parameter_signed(png_warning_parameters p, int number, int format, + png_int_32 value) +{ + png_alloc_size_t u; + png_charp str; + char buffer[PNG_NUMBER_BUFFER_SIZE]; + + /* Avoid overflow by doing the negate in a png_alloc_size_t: */ + u = (png_alloc_size_t)value; + if (value < 0) + u = ~u + 1; + + str = PNG_FORMAT_NUMBER(buffer, format, u); + + if (value < 0 && str > buffer) + *--str = '-'; + + png_warning_parameter(p, number, str); +} + +void +png_formatted_warning(png_const_structrp png_ptr, png_warning_parameters p, + png_const_charp message) +{ + /* The internal buffer is just 192 bytes - enough for all our messages, + * overflow doesn't happen because this code checks! If someone figures + * out how to send us a message longer than 192 bytes, all that will + * happen is that the message will be truncated appropriately. + */ + size_t i = 0; /* Index in the msg[] buffer: */ + char msg[192]; + + /* Each iteration through the following loop writes at most one character + * to msg[i++] then returns here to validate that there is still space for + * the trailing '\0'. It may (in the case of a parameter) read more than + * one character from message[]; it must check for '\0' and continue to the + * test if it finds the end of string. + */ + while (i<(sizeof msg)-1 && *message != '\0') + { + /* '@' at end of string is now just printed (previously it was skipped); + * it is an error in the calling code to terminate the string with @. + */ + if (p != NULL && *message == '@' && message[1] != '\0') + { + int parameter_char = *++message; /* Consume the '@' */ + static const char valid_parameters[] = "123456789"; + int parameter = 0; + + /* Search for the parameter digit, the index in the string is the + * parameter to use. + */ + while (valid_parameters[parameter] != parameter_char && + valid_parameters[parameter] != '\0') + ++parameter; + + /* If the parameter digit is out of range it will just get printed. */ + if (parameter < PNG_WARNING_PARAMETER_COUNT) + { + /* Append this parameter */ + png_const_charp parm = p[parameter]; + png_const_charp pend = p[parameter] + (sizeof p[parameter]); + + /* No need to copy the trailing '\0' here, but there is no guarantee + * that parm[] has been initialized, so there is no guarantee of a + * trailing '\0': + */ + while (i<(sizeof msg)-1 && *parm != '\0' && parm < pend) + msg[i++] = *parm++; + + /* Consume the parameter digit too: */ + ++message; + continue; + } + + /* else not a parameter and there is a character after the @ sign; just + * copy that. This is known not to be '\0' because of the test above. + */ + } + + /* At this point *message can't be '\0', even in the bad parameter case + * above where there is a lone '@' at the end of the message string. + */ + msg[i++] = *message++; + } + + /* i is always less than (sizeof msg), so: */ + msg[i] = '\0'; + + /* And this is the formatted message. It may be larger than + * PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these + * are not (currently) formatted. + */ + png_warning(png_ptr, msg); +} #endif /* PNG_WARNINGS_SUPPORTED */ #ifdef PNG_BENIGN_ERRORS_SUPPORTED void PNGAPI -png_benign_error(png_structp png_ptr, png_const_charp error_message) +png_benign_error(png_const_structrp png_ptr, png_const_charp error_message) { - if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) - png_warning(png_ptr, error_message); - else - png_error(png_ptr, error_message); + if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) + { +# ifdef PNG_READ_SUPPORTED + if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && + png_ptr->chunk_name != 0) + png_chunk_warning(png_ptr, error_message); + else +# endif + png_warning(png_ptr, error_message); + } + + else + { +# ifdef PNG_READ_SUPPORTED + if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && + png_ptr->chunk_name != 0) + png_chunk_error(png_ptr, error_message); + else +# endif + png_error(png_ptr, error_message); + } } -#endif + +void /* PRIVATE */ +png_app_warning(png_const_structrp png_ptr, png_const_charp error_message) +{ + if (png_ptr->flags & PNG_FLAG_APP_WARNINGS_WARN) + png_warning(png_ptr, error_message); + else + png_error(png_ptr, error_message); +} + +void /* PRIVATE */ +png_app_error(png_const_structrp png_ptr, png_const_charp error_message) +{ + if (png_ptr->flags & PNG_FLAG_APP_ERRORS_WARN) + png_warning(png_ptr, error_message); + else + png_error(png_ptr, error_message); +} +#endif /* BENIGN_ERRORS */ /* These utilities are used internally to build an error message that relates * to the current chunk. The chunk name comes from png_ptr->chunk_name, @@ -151,17 +415,20 @@ static PNG_CONST char png_digit[16] = { 'A', 'B', 'C', 'D', 'E', 'F' }; -#define PNG_MAX_ERROR_TEXT 64 +#define PNG_MAX_ERROR_TEXT 196 /* Currently limited be profile_error in png.c */ #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED) static void /* PRIVATE */ -png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp - error_message) +png_format_buffer(png_const_structrp png_ptr, png_charp buffer, png_const_charp + error_message) { - int iout = 0, iin = 0; + png_uint_32 chunk_name = png_ptr->chunk_name; + int iout = 0, ishift = 24; - while (iin < 4) + while (ishift >= 0) { - int c = png_ptr->chunk_name[iin++]; + int c = (int)(chunk_name >> ishift) & 0xff; + + ishift -= 8; if (isnonalpha(c)) { buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET; @@ -169,50 +436,61 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp buffer[iout++] = png_digit[c & 0x0f]; buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET; } + else { - buffer[iout++] = (png_byte)c; + buffer[iout++] = (char)c; } } if (error_message == NULL) buffer[iout] = '\0'; + else { + int iin = 0; + buffer[iout++] = ':'; buffer[iout++] = ' '; - png_memcpy(buffer + iout, error_message, PNG_MAX_ERROR_TEXT); - buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0'; + + while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0') + buffer[iout++] = error_message[iin++]; + + /* iin < PNG_MAX_ERROR_TEXT, so the following is safe: */ + buffer[iout] = '\0'; } } +#endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */ -#ifdef PNG_READ_SUPPORTED -void PNGAPI -png_chunk_error(png_structp png_ptr, png_const_charp error_message) +#if defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) +PNG_FUNCTION(void,PNGAPI +png_chunk_error,(png_const_structrp png_ptr, png_const_charp error_message), + PNG_NORETURN) { char msg[18+PNG_MAX_ERROR_TEXT]; if (png_ptr == NULL) - png_error(png_ptr, error_message); + png_error(png_ptr, error_message); + else { - png_format_buffer(png_ptr, msg, error_message); - png_error(png_ptr, msg); + png_format_buffer(png_ptr, msg, error_message); + png_error(png_ptr, msg); } } -#endif /* PNG_READ_SUPPORTED */ -#endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */ +#endif /* PNG_READ_SUPPORTED && PNG_ERROR_TEXT_SUPPORTED */ #ifdef PNG_WARNINGS_SUPPORTED void PNGAPI -png_chunk_warning(png_structp png_ptr, png_const_charp warning_message) +png_chunk_warning(png_const_structrp png_ptr, png_const_charp warning_message) { char msg[18+PNG_MAX_ERROR_TEXT]; if (png_ptr == NULL) - png_warning(png_ptr, warning_message); + png_warning(png_ptr, warning_message); + else { - png_format_buffer(png_ptr, msg, warning_message); - png_warning(png_ptr, msg); + png_format_buffer(png_ptr, msg, warning_message); + png_warning(png_ptr, msg); } } #endif /* PNG_WARNINGS_SUPPORTED */ @@ -220,29 +498,185 @@ png_chunk_warning(png_structp png_ptr, png_const_charp warning_message) #ifdef PNG_READ_SUPPORTED #ifdef PNG_BENIGN_ERRORS_SUPPORTED void PNGAPI -png_chunk_benign_error(png_structp png_ptr, png_const_charp error_message) +png_chunk_benign_error(png_const_structrp png_ptr, png_const_charp + error_message) { - if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) - png_chunk_warning(png_ptr, error_message); - else - png_chunk_error(png_ptr, error_message); + if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) + png_chunk_warning(png_ptr, error_message); + + else + png_chunk_error(png_ptr, error_message); } #endif #endif /* PNG_READ_SUPPORTED */ +void /* PRIVATE */ +png_chunk_report(png_const_structrp png_ptr, png_const_charp message, int error) +{ + /* This is always supported, but for just read or just write it + * unconditionally does the right thing. + */ +# if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED) + if (png_ptr->mode & PNG_IS_READ_STRUCT) +# endif + +# ifdef PNG_READ_SUPPORTED + { + if (error < PNG_CHUNK_ERROR) + png_chunk_warning(png_ptr, message); + + else + png_chunk_benign_error(png_ptr, message); + } +# endif + +# if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED) + else if (!(png_ptr->mode & PNG_IS_READ_STRUCT)) +# endif + +# ifdef PNG_WRITE_SUPPORTED + { + if (error < PNG_CHUNK_WRITE_ERROR) + png_app_warning(png_ptr, message); + + else + png_app_error(png_ptr, message); + } +# endif +} + +#ifdef PNG_ERROR_TEXT_SUPPORTED +#ifdef PNG_FLOATING_POINT_SUPPORTED +PNG_FUNCTION(void, +png_fixed_error,(png_const_structrp png_ptr, png_const_charp name),PNG_NORETURN) +{ +# define fixed_message "fixed point overflow in " +# define fixed_message_ln ((sizeof fixed_message)-1) + int iin; + char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT]; + memcpy(msg, fixed_message, fixed_message_ln); + iin = 0; + if (name != NULL) while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0) + { + msg[fixed_message_ln + iin] = name[iin]; + ++iin; + } + msg[fixed_message_ln + iin] = 0; + png_error(png_ptr, msg); +} +#endif +#endif + #ifdef PNG_SETJMP_SUPPORTED /* This API only exists if ANSI-C style error handling is used, * otherwise it is necessary for png_default_error to be overridden. */ jmp_buf* PNGAPI -png_set_longjmp_fn(png_structp png_ptr, png_longjmp_ptr longjmp_fn, +png_set_longjmp_fn(png_structrp png_ptr, png_longjmp_ptr longjmp_fn, size_t jmp_buf_size) { - if (png_ptr == NULL || jmp_buf_size != png_sizeof(jmp_buf)) + /* From libpng 1.6.0 the app gets one chance to set a 'jmpbuf_size' value + * and it must not change after that. Libpng doesn't care how big the + * buffer is, just that it doesn't change. + * + * If the buffer size is no *larger* than the size of jmp_buf when libpng is + * compiled a built in jmp_buf is returned; this preserves the pre-1.6.0 + * semantics that this call will not fail. If the size is larger, however, + * the buffer is allocated and this may fail, causing the function to return + * NULL. + */ + if (png_ptr == NULL) return NULL; + if (png_ptr->jmp_buf_ptr == NULL) + { + png_ptr->jmp_buf_size = 0; /* not allocated */ + + if (jmp_buf_size <= (sizeof png_ptr->jmp_buf_local)) + png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; + + else + { + png_ptr->jmp_buf_ptr = png_voidcast(jmp_buf *, + png_malloc_warn(png_ptr, jmp_buf_size)); + + if (png_ptr->jmp_buf_ptr == NULL) + return NULL; /* new NULL return on OOM */ + + png_ptr->jmp_buf_size = jmp_buf_size; + } + } + + else /* Already allocated: check the size */ + { + size_t size = png_ptr->jmp_buf_size; + + if (size == 0) + { + size = (sizeof png_ptr->jmp_buf_local); + if (png_ptr->jmp_buf_ptr != &png_ptr->jmp_buf_local) + { + /* This is an internal error in libpng: somehow we have been left + * with a stack allocated jmp_buf when the application regained + * control. It's always possible to fix this up, but for the moment + * this is a png_error because that makes it easy to detect. + */ + png_error(png_ptr, "Libpng jmp_buf still allocated"); + /* png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; */ + } + } + + if (size != jmp_buf_size) + { + png_warning(png_ptr, "Application jmp_buf size changed"); + return NULL; /* caller will probably crash: no choice here */ + } + } + + /* Finally fill in the function, now we have a satisfactory buffer. It is + * valid to change the function on every call. + */ png_ptr->longjmp_fn = longjmp_fn; - return &png_ptr->jmpbuf; + return png_ptr->jmp_buf_ptr; +} + +void /* PRIVATE */ +png_free_jmpbuf(png_structrp png_ptr) +{ + if (png_ptr != NULL) + { + jmp_buf *jb = png_ptr->jmp_buf_ptr; + + /* A size of 0 is used to indicate a local, stack, allocation of the + * pointer; used here and in png.c + */ + if (jb != NULL && png_ptr->jmp_buf_size > 0) + { + + /* This stuff is so that a failure to free the error control structure + * does not leave libpng in a state with no valid error handling: the + * free always succeeds, if there is an error it gets ignored. + */ + if (jb != &png_ptr->jmp_buf_local) + { + /* Make an internal, libpng, jmp_buf to return here */ + jmp_buf free_jmp_buf; + + if (!setjmp(free_jmp_buf)) + { + png_ptr->jmp_buf_ptr = &free_jmp_buf; /* come back here */ + png_ptr->jmp_buf_size = 0; /* stack allocation */ + png_ptr->longjmp_fn = longjmp; + png_free(png_ptr, jb); /* Return to setjmp on error */ + } + } + } + + /* *Always* cancel everything out: */ + png_ptr->jmp_buf_size = 0; + png_ptr->jmp_buf_ptr = NULL; + png_ptr->longjmp_fn = 0; + } } #endif @@ -251,63 +685,63 @@ png_set_longjmp_fn(png_structp png_ptr, png_longjmp_ptr longjmp_fn, * function is used by default, or if the program supplies NULL for the * error function pointer in png_set_error_fn(). */ -static void /* PRIVATE */ -png_default_error(png_structp png_ptr, png_const_charp error_message) +static PNG_FUNCTION(void /* PRIVATE */, +png_default_error,(png_const_structrp png_ptr, png_const_charp error_message), + PNG_NORETURN) { #ifdef PNG_CONSOLE_IO_SUPPORTED #ifdef PNG_ERROR_NUMBERS_SUPPORTED - if (*error_message == PNG_LITERAL_SHARP) + /* Check on NULL only added in 1.5.4 */ + if (error_message != NULL && *error_message == PNG_LITERAL_SHARP) { - /* Strip "#nnnn " from beginning of error message. */ - int offset; - char error_number[16]; - for (offset = 0; offset<15; offset++) - { + /* Strip "#nnnn " from beginning of error message. */ + int offset; + char error_number[16]; + for (offset = 0; offset<15; offset++) + { error_number[offset] = error_message[offset + 1]; if (error_message[offset] == ' ') - break; - } - if ((offset > 1) && (offset < 15)) - { - error_number[offset - 1] = '\0'; - fprintf(stderr, "libpng error no. %s: %s", - error_number, error_message + offset + 1); - fprintf(stderr, PNG_STRING_NEWLINE); - } - else - { - fprintf(stderr, "libpng error: %s, offset=%d", - error_message, offset); - fprintf(stderr, PNG_STRING_NEWLINE); - } + break; + } + + if ((offset > 1) && (offset < 15)) + { + error_number[offset - 1] = '\0'; + fprintf(stderr, "libpng error no. %s: %s", + error_number, error_message + offset + 1); + fprintf(stderr, PNG_STRING_NEWLINE); + } + + else + { + fprintf(stderr, "libpng error: %s, offset=%d", + error_message, offset); + fprintf(stderr, PNG_STRING_NEWLINE); + } } else #endif { - fprintf(stderr, "libpng error: %s", error_message); + fprintf(stderr, "libpng error: %s", error_message ? error_message : + "undefined"); fprintf(stderr, PNG_STRING_NEWLINE); } +#else + PNG_UNUSED(error_message) /* Make compiler happy */ +#endif + png_longjmp(png_ptr, 1); +} + +PNG_FUNCTION(void,PNGAPI +png_longjmp,(png_const_structrp png_ptr, int val),PNG_NORETURN) +{ +#ifdef PNG_SETJMP_SUPPORTED + if (png_ptr && png_ptr->longjmp_fn && png_ptr->jmp_buf_ptr) + png_ptr->longjmp_fn(*png_ptr->jmp_buf_ptr, val); #endif -#ifdef PNG_SETJMP_SUPPORTED - if (png_ptr && png_ptr->longjmp_fn) - { -# ifdef USE_FAR_KEYWORD - { - jmp_buf jmpbuf; - png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf)); - png_ptr->longjmp_fn(jmpbuf, 1); - } -# else - png_ptr->longjmp_fn(png_ptr->jmpbuf, 1); -# endif - } -#endif /* Here if not setjmp support or if png_ptr is null. */ PNG_ABORT(); -#ifndef PNG_CONSOLE_IO_SUPPORTED - error_message = error_message; /* Make compiler happy */ -#endif } #ifdef PNG_WARNINGS_SUPPORTED @@ -317,61 +751,69 @@ png_default_error(png_structp png_ptr, png_const_charp error_message) * not used, but it is passed in case it may be useful. */ static void /* PRIVATE */ -png_default_warning(png_structp png_ptr, png_const_charp warning_message) +png_default_warning(png_const_structrp png_ptr, png_const_charp warning_message) { #ifdef PNG_CONSOLE_IO_SUPPORTED # ifdef PNG_ERROR_NUMBERS_SUPPORTED if (*warning_message == PNG_LITERAL_SHARP) { - int offset; - char warning_number[16]; - for (offset = 0; offset < 15; offset++) - { - warning_number[offset] = warning_message[offset + 1]; - if (warning_message[offset] == ' ') + int offset; + char warning_number[16]; + for (offset = 0; offset < 15; offset++) + { + warning_number[offset] = warning_message[offset + 1]; + if (warning_message[offset] == ' ') break; - } - if ((offset > 1) && (offset < 15)) - { - warning_number[offset + 1] = '\0'; - fprintf(stderr, "libpng warning no. %s: %s", - warning_number, warning_message + offset); - fprintf(stderr, PNG_STRING_NEWLINE); - } - else - { - fprintf(stderr, "libpng warning: %s", - warning_message); - fprintf(stderr, PNG_STRING_NEWLINE); - } + } + + if ((offset > 1) && (offset < 15)) + { + warning_number[offset + 1] = '\0'; + fprintf(stderr, "libpng warning no. %s: %s", + warning_number, warning_message + offset); + fprintf(stderr, PNG_STRING_NEWLINE); + } + + else + { + fprintf(stderr, "libpng warning: %s", + warning_message); + fprintf(stderr, PNG_STRING_NEWLINE); + } } else # endif + { - fprintf(stderr, "libpng warning: %s", warning_message); - fprintf(stderr, PNG_STRING_NEWLINE); + fprintf(stderr, "libpng warning: %s", warning_message); + fprintf(stderr, PNG_STRING_NEWLINE); } #else - warning_message = warning_message; /* Make compiler happy */ + PNG_UNUSED(warning_message) /* Make compiler happy */ #endif - png_ptr = png_ptr; /* Make compiler happy */ + PNG_UNUSED(png_ptr) /* Make compiler happy */ } #endif /* PNG_WARNINGS_SUPPORTED */ /* This function is called when the application wants to use another method * of handling errors and warnings. Note that the error function MUST NOT * return to the calling routine or serious problems will occur. The return - * method used in the default routine calls longjmp(png_ptr->jmpbuf, 1) + * method used in the default routine calls longjmp(png_ptr->jmp_buf_ptr, 1) */ void PNGAPI -png_set_error_fn(png_structp png_ptr, png_voidp error_ptr, - png_error_ptr error_fn, png_error_ptr warning_fn) +png_set_error_fn(png_structrp png_ptr, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warning_fn) { if (png_ptr == NULL) return; + png_ptr->error_ptr = error_ptr; png_ptr->error_fn = error_fn; +#ifdef PNG_WARNINGS_SUPPORTED png_ptr->warning_fn = warning_fn; +#else + PNG_UNUSED(warning_fn) +#endif } @@ -380,23 +822,111 @@ png_set_error_fn(png_structp png_ptr, png_voidp error_ptr, * pointer before png_write_destroy and png_read_destroy are called. */ png_voidp PNGAPI -png_get_error_ptr(png_const_structp png_ptr) +png_get_error_ptr(png_const_structrp png_ptr) { if (png_ptr == NULL) return NULL; + return ((png_voidp)png_ptr->error_ptr); } #ifdef PNG_ERROR_NUMBERS_SUPPORTED void PNGAPI -png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode) +png_set_strip_error_numbers(png_structrp png_ptr, png_uint_32 strip_mode) { if (png_ptr != NULL) { - png_ptr->flags &= - ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode); + png_ptr->flags &= + ((~(PNG_FLAG_STRIP_ERROR_NUMBERS | + PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode); } } #endif + +#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ + defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) + /* Currently the above both depend on SETJMP_SUPPORTED, however it would be + * possible to implement without setjmp support just so long as there is some + * way to handle the error return here: + */ +PNG_FUNCTION(void /* PRIVATE */, +png_safe_error,(png_structp png_nonconst_ptr, png_const_charp error_message), + PNG_NORETURN) +{ + const png_const_structrp png_ptr = png_nonconst_ptr; + png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr); + + /* An error is always logged here, overwriting anything (typically a warning) + * that is already there: + */ + if (image != NULL) + { + png_safecat(image->message, (sizeof image->message), 0, error_message); + image->warning_or_error |= PNG_IMAGE_ERROR; + + /* Retrieve the jmp_buf from within the png_control, making this work for + * C++ compilation too is pretty tricky: C++ wants a pointer to the first + * element of a jmp_buf, but C doesn't tell us the type of that. + */ + if (image->opaque != NULL && image->opaque->error_buf != NULL) + longjmp(png_control_jmp_buf(image->opaque), 1); + + /* Missing longjmp buffer, the following is to help debugging: */ + { + size_t pos = png_safecat(image->message, (sizeof image->message), 0, + "bad longjmp: "); + png_safecat(image->message, (sizeof image->message), pos, + error_message); + } + } + + /* Here on an internal programming error. */ + abort(); +} + +#ifdef PNG_WARNINGS_SUPPORTED +void /* PRIVATE */ +png_safe_warning(png_structp png_nonconst_ptr, png_const_charp warning_message) +{ + const png_const_structrp png_ptr = png_nonconst_ptr; + png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr); + + /* A warning is only logged if there is no prior warning or error. */ + if (image->warning_or_error == 0) + { + png_safecat(image->message, (sizeof image->message), 0, warning_message); + image->warning_or_error |= PNG_IMAGE_WARNING; + } +} +#endif + +int /* PRIVATE */ +png_safe_execute(png_imagep image_in, int (*function)(png_voidp), png_voidp arg) +{ + volatile png_imagep image = image_in; + volatile int result; + volatile png_voidp saved_error_buf; + jmp_buf safe_jmpbuf; + + /* Safely execute function(arg) with png_error returning to this function. */ + saved_error_buf = image->opaque->error_buf; + result = setjmp(safe_jmpbuf) == 0; + + if (result) + { + + image->opaque->error_buf = safe_jmpbuf; + result = function(arg); + } + + image->opaque->error_buf = saved_error_buf; + + /* And do the cleanup prior to any failure return. */ + if (!result) + png_image_free(image); + + return result; +} +#endif /* SIMPLIFIED READ/WRITE */ #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ diff --git a/project/jni/png/pngget.c b/project/jni/png/pngget.c index fb019a927..aca63a958 100644 --- a/project/jni/png/pngget.c +++ b/project/jni/png/pngget.c @@ -1,8 +1,8 @@ /* pngget.c - retrieval of values from info struct * - * Last changed in libpng 1.4.6 [January 23, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.1 [March 28, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -12,48 +12,44 @@ * */ -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" -#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) #include "pngpriv.h" +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) + png_uint_32 PNGAPI -png_get_valid(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_valid(png_const_structrp png_ptr, png_const_inforp info_ptr, png_uint_32 flag) { if (png_ptr != NULL && info_ptr != NULL) return(info_ptr->valid & flag); - else - return(0); + return(0); } png_size_t PNGAPI -png_get_rowbytes(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_rowbytes(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return(info_ptr->rowbytes); - else - return(0); + return(0); } #ifdef PNG_INFO_IMAGE_SUPPORTED png_bytepp PNGAPI -png_get_rows(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_rows(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return(info_ptr->row_pointers); - else - return(0); + return(0); } #endif #ifdef PNG_EASY_ACCESS_SUPPORTED /* Easy access to info, added in libpng-0.99 */ png_uint_32 PNGAPI -png_get_image_width(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_image_width(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return info_ptr->width; @@ -62,7 +58,7 @@ png_get_image_width(png_const_structp png_ptr, png_const_infop info_ptr) } png_uint_32 PNGAPI -png_get_image_height(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_image_height(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return info_ptr->height; @@ -71,7 +67,7 @@ png_get_image_height(png_const_structp png_ptr, png_const_infop info_ptr) } png_byte PNGAPI -png_get_bit_depth(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_bit_depth(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return info_ptr->bit_depth; @@ -80,7 +76,7 @@ png_get_bit_depth(png_const_structp png_ptr, png_const_infop info_ptr) } png_byte PNGAPI -png_get_color_type(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_color_type(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return info_ptr->color_type; @@ -89,7 +85,7 @@ png_get_color_type(png_const_structp png_ptr, png_const_infop info_ptr) } png_byte PNGAPI -png_get_filter_type(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_filter_type(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return info_ptr->filter_type; @@ -98,7 +94,7 @@ png_get_filter_type(png_const_structp png_ptr, png_const_infop info_ptr) } png_byte PNGAPI -png_get_interlace_type(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_interlace_type(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return info_ptr->interlace_type; @@ -107,7 +103,7 @@ png_get_interlace_type(png_const_structp png_ptr, png_const_infop info_ptr) } png_byte PNGAPI -png_get_compression_type(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_compression_type(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return info_ptr->compression_type; @@ -116,222 +112,284 @@ png_get_compression_type(png_const_structp png_ptr, png_const_infop info_ptr) } png_uint_32 PNGAPI -png_get_x_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_x_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp + info_ptr) { - if (png_ptr != NULL && info_ptr != NULL) #ifdef PNG_pHYs_SUPPORTED - if (info_ptr->valid & PNG_INFO_pHYs) - { - png_debug1(1, "in %s retrieval function", "png_get_x_pixels_per_meter"); + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) + { + png_debug1(1, "in %s retrieval function", + "png_get_x_pixels_per_meter"); - if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER) - return (0); - - else - return (info_ptr->x_pixels_per_unit); - } -#else - return (0); + if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER) + return (info_ptr->x_pixels_per_unit); + } #endif + return (0); } png_uint_32 PNGAPI -png_get_y_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_y_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp + info_ptr) { - if (png_ptr != NULL && info_ptr != NULL) #ifdef PNG_pHYs_SUPPORTED - if (info_ptr->valid & PNG_INFO_pHYs) + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) { - png_debug1(1, "in %s retrieval function", "png_get_y_pixels_per_meter"); + png_debug1(1, "in %s retrieval function", + "png_get_y_pixels_per_meter"); - if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER) - return (0); - - else - return (info_ptr->y_pixels_per_unit); + if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER) + return (info_ptr->y_pixels_per_unit); } -#else - return (0); #endif + return (0); } png_uint_32 PNGAPI -png_get_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr) { - if (png_ptr != NULL && info_ptr != NULL) #ifdef PNG_pHYs_SUPPORTED - if (info_ptr->valid & PNG_INFO_pHYs) + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) { png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter"); - if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER || - info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit) - return (0); - - else - return (info_ptr->x_pixels_per_unit); + if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER && + info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit) + return (info_ptr->x_pixels_per_unit); } -#else - return (0); #endif + return (0); } #ifdef PNG_FLOATING_POINT_SUPPORTED float PNGAPI -png_get_pixel_aspect_ratio(png_const_structp png_ptr, png_const_infop info_ptr) - { - if (png_ptr != NULL && info_ptr != NULL) -#ifdef PNG_pHYs_SUPPORTED - - if (info_ptr->valid & PNG_INFO_pHYs) +png_get_pixel_aspect_ratio(png_const_structrp png_ptr, png_const_inforp + info_ptr) +{ +#ifdef PNG_READ_pHYs_SUPPORTED + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) { png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio"); - if (info_ptr->x_pixels_per_unit == 0) - return ((float)0.0); - - else + if (info_ptr->x_pixels_per_unit != 0) return ((float)((float)info_ptr->y_pixels_per_unit - /(float)info_ptr->x_pixels_per_unit)); + /(float)info_ptr->x_pixels_per_unit)); } #else - return (0.0); + PNG_UNUSED(png_ptr) + PNG_UNUSED(info_ptr) #endif + return ((float)0.0); } #endif -png_int_32 PNGAPI -png_get_x_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr) +#ifdef PNG_FIXED_POINT_SUPPORTED +png_fixed_point PNGAPI +png_get_pixel_aspect_ratio_fixed(png_const_structrp png_ptr, + png_const_inforp info_ptr) { - if (png_ptr != NULL && info_ptr != NULL) -#ifdef PNG_oFFs_SUPPORTED +#ifdef PNG_READ_pHYs_SUPPORTED + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs) + && info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0 + && info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX + && info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX) + { + png_fixed_point res; - if (info_ptr->valid & PNG_INFO_oFFs) + png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio_fixed"); + + /* The following casts work because a PNG 4 byte integer only has a valid + * range of 0..2^31-1; otherwise the cast might overflow. + */ + if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1, + (png_int_32)info_ptr->x_pixels_per_unit)) + return res; + } +#else + PNG_UNUSED(png_ptr) + PNG_UNUSED(info_ptr) +#endif + + return 0; +} +#endif + +png_int_32 PNGAPI +png_get_x_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr) +{ +#ifdef PNG_oFFs_SUPPORTED + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) { png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns"); - if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER) - return (0); - - else - return (info_ptr->x_offset); + if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER) + return (info_ptr->x_offset); } -#else - return (0); #endif + return (0); } png_int_32 PNGAPI -png_get_y_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_y_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr) { - if (png_ptr != NULL && info_ptr != NULL) - #ifdef PNG_oFFs_SUPPORTED - if (info_ptr->valid & PNG_INFO_oFFs) + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) { png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns"); - if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER) - return (0); - - else - return (info_ptr->y_offset); + if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER) + return (info_ptr->y_offset); } -#else - return (0); #endif + return (0); } png_int_32 PNGAPI -png_get_x_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_x_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr) { - if (png_ptr != NULL && info_ptr != NULL) - #ifdef PNG_oFFs_SUPPORTED - if (info_ptr->valid & PNG_INFO_oFFs) + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) { - png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns"); + png_debug1(1, "in %s retrieval function", "png_get_x_offset_pixels"); - if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL) - return (0); - - else - return (info_ptr->x_offset); + if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL) + return (info_ptr->x_offset); } -#else - return (0); #endif + return (0); } png_int_32 PNGAPI -png_get_y_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_y_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr) { - if (png_ptr != NULL && info_ptr != NULL) - #ifdef PNG_oFFs_SUPPORTED - if (info_ptr->valid & PNG_INFO_oFFs) + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) { - png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns"); + png_debug1(1, "in %s retrieval function", "png_get_y_offset_pixels"); - if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL) - return (0); - - else - return (info_ptr->y_offset); + if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL) + return (info_ptr->y_offset); } -#else - return (0); #endif + return (0); } -#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) -png_uint_32 PNGAPI -png_get_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr) +#ifdef PNG_INCH_CONVERSIONS_SUPPORTED +static png_uint_32 +ppi_from_ppm(png_uint_32 ppm) { - return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr) - *.0254 +.5)); +#if 0 + /* The conversion is *(2.54/100), in binary (32 digits): + * .00000110100000001001110101001001 + */ + png_uint_32 t1001, t1101; + ppm >>= 1; /* .1 */ + t1001 = ppm + (ppm >> 3); /* .1001 */ + t1101 = t1001 + (ppm >> 1); /* .1101 */ + ppm >>= 20; /* .000000000000000000001 */ + t1101 += t1101 >> 15; /* .1101000000000001101 */ + t1001 >>= 11; /* .000000000001001 */ + t1001 += t1001 >> 12; /* .000000000001001000000001001 */ + ppm += t1001; /* .000000000001001000001001001 */ + ppm += t1101; /* .110100000001001110101001001 */ + return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */ +#else + /* The argument is a PNG unsigned integer, so it is not permitted + * to be bigger than 2^31. + */ + png_fixed_point result; + if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127, + 5000)) + return result; + + /* Overflow. */ + return 0; +#endif } png_uint_32 PNGAPI -png_get_x_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr) { - return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr) - *.0254 +.5)); + return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr)); } png_uint_32 PNGAPI -png_get_y_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_x_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr) { - return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr) - *.0254 +.5)); + return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr)); } +png_uint_32 PNGAPI +png_get_y_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr) +{ + return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr)); +} + +#ifdef PNG_FIXED_POINT_SUPPORTED +static png_fixed_point +png_fixed_inches_from_microns(png_const_structrp png_ptr, png_int_32 microns) +{ + /* Convert from metres * 1,000,000 to inches * 100,000, meters to + * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127. + * Notice that this can overflow - a warning is output and 0 is + * returned. + */ + return png_muldiv_warn(png_ptr, microns, 500, 127); +} + +png_fixed_point PNGAPI +png_get_x_offset_inches_fixed(png_const_structrp png_ptr, + png_const_inforp info_ptr) +{ + return png_fixed_inches_from_microns(png_ptr, + png_get_x_offset_microns(png_ptr, info_ptr)); +} +#endif + +#ifdef PNG_FIXED_POINT_SUPPORTED +png_fixed_point PNGAPI +png_get_y_offset_inches_fixed(png_const_structrp png_ptr, + png_const_inforp info_ptr) +{ + return png_fixed_inches_from_microns(png_ptr, + png_get_y_offset_microns(png_ptr, info_ptr)); +} +#endif + +#ifdef PNG_FLOATING_POINT_SUPPORTED float PNGAPI -png_get_x_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_x_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr) { - return ((float)png_get_x_offset_microns(png_ptr, info_ptr) - *.00003937); + /* To avoid the overflow do the conversion directly in floating + * point. + */ + return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937); } +#endif +#ifdef PNG_FLOATING_POINT_SUPPORTED float PNGAPI -png_get_y_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_y_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr) { - return ((float)png_get_y_offset_microns(png_ptr, info_ptr) - *.00003937); + /* To avoid the overflow do the conversion directly in floating + * point. + */ + return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937); } +#endif #ifdef PNG_pHYs_SUPPORTED png_uint_32 PNGAPI -png_get_pHYs_dpi(png_const_structp png_ptr, png_const_infop info_ptr, - png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) +png_get_pHYs_dpi(png_const_structrp png_ptr, png_const_inforp info_ptr, + png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) { png_uint_32 retval = 0; @@ -344,15 +402,18 @@ png_get_pHYs_dpi(png_const_structp png_ptr, png_const_infop info_ptr, *res_x = info_ptr->x_pixels_per_unit; retval |= PNG_INFO_pHYs; } + if (res_y != NULL) { *res_y = info_ptr->y_pixels_per_unit; retval |= PNG_INFO_pHYs; } + if (unit_type != NULL) { *unit_type = (int)info_ptr->phys_unit_type; retval |= PNG_INFO_pHYs; + if (*unit_type == 1) { if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50); @@ -360,228 +421,348 @@ png_get_pHYs_dpi(png_const_structp png_ptr, png_const_infop info_ptr, } } } + return (retval); } #endif /* PNG_pHYs_SUPPORTED */ -#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ +#endif /* PNG_INCH_CONVERSIONS_SUPPORTED */ /* png_get_channels really belongs in here, too, but it's been around longer */ #endif /* PNG_EASY_ACCESS_SUPPORTED */ + png_byte PNGAPI -png_get_channels(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_channels(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return(info_ptr->channels); - else - return (0); + + return (0); } -png_bytep PNGAPI -png_get_signature(png_const_structp png_ptr, png_infop info_ptr) +#ifdef PNG_READ_SUPPORTED +png_const_bytep PNGAPI +png_get_signature(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return(info_ptr->signature); - else - return (NULL); + + return (NULL); } +#endif #ifdef PNG_bKGD_SUPPORTED png_uint_32 PNGAPI -png_get_bKGD(png_const_structp png_ptr, png_infop info_ptr, +png_get_bKGD(png_const_structrp png_ptr, png_inforp info_ptr, png_color_16p *background) { if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD) - && background != NULL) + && background != NULL) { png_debug1(1, "in %s retrieval function", "bKGD"); *background = &(info_ptr->background); return (PNG_INFO_bKGD); } + return (0); } #endif #ifdef PNG_cHRM_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED +/* The XYZ APIs were added in 1.5.5 to take advantage of the code added at the + * same time to correct the rgb grayscale coefficient defaults obtained from the + * cHRM chunk in 1.5.4 + */ +# ifdef PNG_FLOATING_POINT_SUPPORTED png_uint_32 PNGAPI -png_get_cHRM(png_const_structp png_ptr, png_const_infop info_ptr, - double *white_x, double *white_y, double *red_x, double *red_y, - double *green_x, double *green_y, double *blue_x, double *blue_y) +png_get_cHRM(png_const_structrp png_ptr, png_const_inforp info_ptr, + double *white_x, double *white_y, double *red_x, double *red_y, + double *green_x, double *green_y, double *blue_x, double *blue_y) { - if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) + /* Quiet API change: this code used to only return the end points if a cHRM + * chunk was present, but the end points can also come from iCCP or sRGB + * chunks, so in 1.6.0 the png_get_ APIs return the end points regardless and + * the png_set_ APIs merely check that set end points are mutually + * consistent. + */ + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS)) { png_debug1(1, "in %s retrieval function", "cHRM"); if (white_x != NULL) - *white_x = (double)info_ptr->x_white; + *white_x = png_float(png_ptr, + info_ptr->colorspace.end_points_xy.whitex, "cHRM white X"); if (white_y != NULL) - *white_y = (double)info_ptr->y_white; + *white_y = png_float(png_ptr, + info_ptr->colorspace.end_points_xy.whitey, "cHRM white Y"); if (red_x != NULL) - *red_x = (double)info_ptr->x_red; + *red_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redx, + "cHRM red X"); if (red_y != NULL) - *red_y = (double)info_ptr->y_red; + *red_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redy, + "cHRM red Y"); if (green_x != NULL) - *green_x = (double)info_ptr->x_green; + *green_x = png_float(png_ptr, + info_ptr->colorspace.end_points_xy.greenx, "cHRM green X"); if (green_y != NULL) - *green_y = (double)info_ptr->y_green; + *green_y = png_float(png_ptr, + info_ptr->colorspace.end_points_xy.greeny, "cHRM green Y"); if (blue_x != NULL) - *blue_x = (double)info_ptr->x_blue; + *blue_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluex, + "cHRM blue X"); if (blue_y != NULL) - *blue_y = (double)info_ptr->y_blue; + *blue_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluey, + "cHRM blue Y"); return (PNG_INFO_cHRM); } + return (0); } -#endif -#ifdef PNG_FIXED_POINT_SUPPORTED + png_uint_32 PNGAPI -png_get_cHRM_fixed(png_const_structp png_ptr, png_const_infop info_ptr, - png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x, - png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y, - png_fixed_point *blue_x, png_fixed_point *blue_y) +png_get_cHRM_XYZ(png_const_structrp png_ptr, png_const_inforp info_ptr, + double *red_X, double *red_Y, double *red_Z, double *green_X, + double *green_Y, double *green_Z, double *blue_X, double *blue_Y, + double *blue_Z) +{ + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS)) + { + png_debug1(1, "in %s retrieval function", "cHRM_XYZ(float)"); + + if (red_X != NULL) + *red_X = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_X, + "cHRM red X"); + if (red_Y != NULL) + *red_Y = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Y, + "cHRM red Y"); + if (red_Z != NULL) + *red_Z = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Z, + "cHRM red Z"); + if (green_X != NULL) + *green_X = png_float(png_ptr, + info_ptr->colorspace.end_points_XYZ.green_X, "cHRM green X"); + if (green_Y != NULL) + *green_Y = png_float(png_ptr, + info_ptr->colorspace.end_points_XYZ.green_Y, "cHRM green Y"); + if (green_Z != NULL) + *green_Z = png_float(png_ptr, + info_ptr->colorspace.end_points_XYZ.green_Z, "cHRM green Z"); + if (blue_X != NULL) + *blue_X = png_float(png_ptr, + info_ptr->colorspace.end_points_XYZ.blue_X, "cHRM blue X"); + if (blue_Y != NULL) + *blue_Y = png_float(png_ptr, + info_ptr->colorspace.end_points_XYZ.blue_Y, "cHRM blue Y"); + if (blue_Z != NULL) + *blue_Z = png_float(png_ptr, + info_ptr->colorspace.end_points_XYZ.blue_Z, "cHRM blue Z"); + return (PNG_INFO_cHRM); + } + + return (0); +} +# endif + +# ifdef PNG_FIXED_POINT_SUPPORTED +png_uint_32 PNGAPI +png_get_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr, + png_fixed_point *int_red_X, png_fixed_point *int_red_Y, + png_fixed_point *int_red_Z, png_fixed_point *int_green_X, + png_fixed_point *int_green_Y, png_fixed_point *int_green_Z, + png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y, + png_fixed_point *int_blue_Z) +{ + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS)) + { + png_debug1(1, "in %s retrieval function", "cHRM_XYZ"); + + if (int_red_X != NULL) + *int_red_X = info_ptr->colorspace.end_points_XYZ.red_X; + if (int_red_Y != NULL) + *int_red_Y = info_ptr->colorspace.end_points_XYZ.red_Y; + if (int_red_Z != NULL) + *int_red_Z = info_ptr->colorspace.end_points_XYZ.red_Z; + if (int_green_X != NULL) + *int_green_X = info_ptr->colorspace.end_points_XYZ.green_X; + if (int_green_Y != NULL) + *int_green_Y = info_ptr->colorspace.end_points_XYZ.green_Y; + if (int_green_Z != NULL) + *int_green_Z = info_ptr->colorspace.end_points_XYZ.green_Z; + if (int_blue_X != NULL) + *int_blue_X = info_ptr->colorspace.end_points_XYZ.blue_X; + if (int_blue_Y != NULL) + *int_blue_Y = info_ptr->colorspace.end_points_XYZ.blue_Y; + if (int_blue_Z != NULL) + *int_blue_Z = info_ptr->colorspace.end_points_XYZ.blue_Z; + return (PNG_INFO_cHRM); + } + + return (0); +} + +png_uint_32 PNGAPI +png_get_cHRM_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr, + png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x, + png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y, + png_fixed_point *blue_x, png_fixed_point *blue_y) { png_debug1(1, "in %s retrieval function", "cHRM"); - if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS)) { if (white_x != NULL) - *white_x = info_ptr->int_x_white; + *white_x = info_ptr->colorspace.end_points_xy.whitex; if (white_y != NULL) - *white_y = info_ptr->int_y_white; + *white_y = info_ptr->colorspace.end_points_xy.whitey; if (red_x != NULL) - *red_x = info_ptr->int_x_red; + *red_x = info_ptr->colorspace.end_points_xy.redx; if (red_y != NULL) - *red_y = info_ptr->int_y_red; + *red_y = info_ptr->colorspace.end_points_xy.redy; if (green_x != NULL) - *green_x = info_ptr->int_x_green; + *green_x = info_ptr->colorspace.end_points_xy.greenx; if (green_y != NULL) - *green_y = info_ptr->int_y_green; + *green_y = info_ptr->colorspace.end_points_xy.greeny; if (blue_x != NULL) - *blue_x = info_ptr->int_x_blue; + *blue_x = info_ptr->colorspace.end_points_xy.bluex; if (blue_y != NULL) - *blue_y = info_ptr->int_y_blue; + *blue_y = info_ptr->colorspace.end_points_xy.bluey; return (PNG_INFO_cHRM); } + return (0); } -#endif +# endif #endif #ifdef PNG_gAMA_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED +# ifdef PNG_FIXED_POINT_SUPPORTED png_uint_32 PNGAPI -png_get_gAMA(png_const_structp png_ptr, png_const_infop info_ptr, double *file_gamma) +png_get_gAMA_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr, + png_fixed_point *file_gamma) { png_debug1(1, "in %s retrieval function", "gAMA"); - if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) - && file_gamma != NULL) + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) && + file_gamma != NULL) { - *file_gamma = (double)info_ptr->gamma; + *file_gamma = info_ptr->colorspace.gamma; return (PNG_INFO_gAMA); } - return (0); -} -#endif -#ifdef PNG_FIXED_POINT_SUPPORTED -png_uint_32 PNGAPI -png_get_gAMA_fixed(png_const_structp png_ptr, png_const_infop info_ptr, - png_fixed_point *int_file_gamma) -{ - png_debug1(1, "in %s retrieval function", "gAMA"); - if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) - && int_file_gamma != NULL) - { - *int_file_gamma = info_ptr->int_gamma; - return (PNG_INFO_gAMA); - } return (0); } -#endif +# endif + +# ifdef PNG_FLOATING_POINT_SUPPORTED +png_uint_32 PNGAPI +png_get_gAMA(png_const_structrp png_ptr, png_const_inforp info_ptr, + double *file_gamma) +{ + png_debug1(1, "in %s retrieval function", "gAMA(float)"); + + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) && + file_gamma != NULL) + { + *file_gamma = png_float(png_ptr, info_ptr->colorspace.gamma, + "png_get_gAMA"); + return (PNG_INFO_gAMA); + } + + return (0); +} +# endif #endif #ifdef PNG_sRGB_SUPPORTED png_uint_32 PNGAPI -png_get_sRGB(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_sRGB(png_const_structrp png_ptr, png_const_inforp info_ptr, int *file_srgb_intent) { png_debug1(1, "in %s retrieval function", "sRGB"); if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB) - && file_srgb_intent != NULL) + && file_srgb_intent != NULL) { - *file_srgb_intent = (int)info_ptr->srgb_intent; + *file_srgb_intent = info_ptr->colorspace.rendering_intent; return (PNG_INFO_sRGB); } + return (0); } #endif #ifdef PNG_iCCP_SUPPORTED png_uint_32 PNGAPI -png_get_iCCP(png_const_structp png_ptr, png_const_infop info_ptr, - png_charpp name, int *compression_type, - png_charpp profile, png_uint_32 *proflen) +png_get_iCCP(png_const_structrp png_ptr, png_inforp info_ptr, + png_charpp name, int *compression_type, + png_bytepp profile, png_uint_32 *proflen) { png_debug1(1, "in %s retrieval function", "iCCP"); if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP) - && name != NULL && profile != NULL && proflen != NULL) + && name != NULL && compression_type != NULL && profile != NULL && + proflen != NULL) { *name = info_ptr->iccp_name; *profile = info_ptr->iccp_profile; - /* Compression_type is a dummy so the API won't have to change - * if we introduce multiple compression types later. + *proflen = png_get_uint_32(info_ptr->iccp_profile); + /* This is somewhat irrelevant since the profile data returned has + * actually been uncompressed. */ - *proflen = (int)info_ptr->iccp_proflen; - *compression_type = (int)info_ptr->iccp_compression; + *compression_type = PNG_COMPRESSION_TYPE_BASE; return (PNG_INFO_iCCP); } + return (0); } #endif #ifdef PNG_sPLT_SUPPORTED -png_uint_32 PNGAPI -png_get_sPLT(png_const_structp png_ptr, png_const_infop info_ptr, - png_sPLT_tpp spalettes) +int PNGAPI +png_get_sPLT(png_const_structrp png_ptr, png_inforp info_ptr, + png_sPLT_tpp spalettes) { if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL) { - *spalettes = info_ptr->splt_palettes; - return ((png_uint_32)info_ptr->splt_palettes_num); + *spalettes = info_ptr->splt_palettes; + return info_ptr->splt_palettes_num; } + return (0); } #endif #ifdef PNG_hIST_SUPPORTED png_uint_32 PNGAPI -png_get_hIST(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_hIST(png_const_structrp png_ptr, png_inforp info_ptr, png_uint_16p *hist) { png_debug1(1, "in %s retrieval function", "hIST"); if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST) - && hist != NULL) + && hist != NULL) { *hist = info_ptr->hist; return (PNG_INFO_hIST); } + return (0); } #endif png_uint_32 PNGAPI -png_get_IHDR(png_structp png_ptr, png_infop info_ptr, - png_uint_32 *width, png_uint_32 *height, int *bit_depth, - int *color_type, int *interlace_type, int *compression_type, - int *filter_type) - +png_get_IHDR(png_const_structrp png_ptr, png_const_inforp info_ptr, + png_uint_32 *width, png_uint_32 *height, int *bit_depth, + int *color_type, int *interlace_type, int *compression_type, + int *filter_type) { png_debug1(1, "in %s retrieval function", "IHDR"); @@ -608,7 +789,7 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr, * application has ignored our advice not to mess with the members * of info_ptr directly. */ - png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height, + png_check_IHDR(png_ptr, info_ptr->width, info_ptr->height, info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type, info_ptr->compression_type, info_ptr->filter_type); @@ -617,28 +798,29 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr, #ifdef PNG_oFFs_SUPPORTED png_uint_32 PNGAPI -png_get_oFFs(png_const_structp png_ptr, png_const_infop info_ptr, - png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type) +png_get_oFFs(png_const_structrp png_ptr, png_const_inforp info_ptr, + png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type) { png_debug1(1, "in %s retrieval function", "oFFs"); if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs) - && offset_x != NULL && offset_y != NULL && unit_type != NULL) + && offset_x != NULL && offset_y != NULL && unit_type != NULL) { *offset_x = info_ptr->x_offset; *offset_y = info_ptr->y_offset; *unit_type = (int)info_ptr->offset_unit_type; return (PNG_INFO_oFFs); } + return (0); } #endif #ifdef PNG_pCAL_SUPPORTED png_uint_32 PNGAPI -png_get_pCAL(png_const_structp png_ptr, png_const_infop info_ptr, - png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams, - png_charp *units, png_charpp *params) +png_get_pCAL(png_const_structrp png_ptr, png_inforp info_ptr, + png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams, + png_charp *units, png_charpp *params) { png_debug1(1, "in %s retrieval function", "pCAL"); @@ -655,57 +837,82 @@ png_get_pCAL(png_const_structp png_ptr, png_const_infop info_ptr, *params = info_ptr->pcal_params; return (PNG_INFO_pCAL); } + return (0); } #endif #ifdef PNG_sCAL_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED +# ifdef PNG_FIXED_POINT_SUPPORTED +# if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \ + defined(PNG_FLOATING_POINT_SUPPORTED) png_uint_32 PNGAPI -png_get_sCAL(png_const_structp png_ptr, png_const_infop info_ptr, - int *unit, double *width, double *height) +png_get_sCAL_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr, + int *unit, png_fixed_point *width, png_fixed_point *height) { - if (png_ptr != NULL && info_ptr != NULL && - (info_ptr->valid & PNG_INFO_sCAL)) - { - *unit = info_ptr->scal_unit; - *width = info_ptr->scal_pixel_width; - *height = info_ptr->scal_pixel_height; - return (PNG_INFO_sCAL); - } - return(0); + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->valid & PNG_INFO_sCAL)) + { + *unit = info_ptr->scal_unit; + /*TODO: make this work without FP support; the API is currently eliminated + * if neither floating point APIs nor internal floating point arithmetic + * are enabled. + */ + *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width"); + *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height), + "sCAL height"); + return (PNG_INFO_sCAL); + } + + return(0); } -#else -#ifdef PNG_FIXED_POINT_SUPPORTED +# endif /* FLOATING_ARITHMETIC */ +# endif /* FIXED_POINT */ +# ifdef PNG_FLOATING_POINT_SUPPORTED png_uint_32 PNGAPI -png_get_sCAL_s(png_const_structp png_ptr, png_const_infop info_ptr, - int *unit, png_charpp width, png_charpp height) +png_get_sCAL(png_const_structrp png_ptr, png_const_inforp info_ptr, + int *unit, double *width, double *height) { - if (png_ptr != NULL && info_ptr != NULL && - (info_ptr->valid & PNG_INFO_sCAL)) - { - *unit = info_ptr->scal_unit; - *width = info_ptr->scal_s_width; - *height = info_ptr->scal_s_height; - return (PNG_INFO_sCAL); - } - return(0); + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->valid & PNG_INFO_sCAL)) + { + *unit = info_ptr->scal_unit; + *width = atof(info_ptr->scal_s_width); + *height = atof(info_ptr->scal_s_height); + return (PNG_INFO_sCAL); + } + + return(0); } -#endif -#endif -#endif +# endif /* FLOATING POINT */ +png_uint_32 PNGAPI +png_get_sCAL_s(png_const_structrp png_ptr, png_const_inforp info_ptr, + int *unit, png_charpp width, png_charpp height) +{ + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->valid & PNG_INFO_sCAL)) + { + *unit = info_ptr->scal_unit; + *width = info_ptr->scal_s_width; + *height = info_ptr->scal_s_height; + return (PNG_INFO_sCAL); + } + + return(0); +} +#endif /* sCAL */ #ifdef PNG_pHYs_SUPPORTED png_uint_32 PNGAPI -png_get_pHYs(png_const_structp png_ptr, png_const_infop info_ptr, - png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) +png_get_pHYs(png_const_structrp png_ptr, png_const_inforp info_ptr, + png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) { png_uint_32 retval = 0; png_debug1(1, "in %s retrieval function", "pHYs"); if (png_ptr != NULL && info_ptr != NULL && - (info_ptr->valid & PNG_INFO_pHYs)) + (info_ptr->valid & PNG_INFO_pHYs)) { if (res_x != NULL) { @@ -725,14 +932,14 @@ png_get_pHYs(png_const_structp png_ptr, png_const_infop info_ptr, retval |= PNG_INFO_pHYs; } } + return (retval); } -#endif +#endif /* pHYs */ png_uint_32 PNGAPI -png_get_PLTE(png_const_structp png_ptr, png_const_infop info_ptr, - png_colorp *palette, - int *num_palette) +png_get_PLTE(png_const_structrp png_ptr, png_inforp info_ptr, + png_colorp *palette, int *num_palette) { png_debug1(1, "in %s retrieval function", "PLTE"); @@ -744,36 +951,37 @@ png_get_PLTE(png_const_structp png_ptr, png_const_infop info_ptr, png_debug1(3, "num_palette = %d", *num_palette); return (PNG_INFO_PLTE); } + return (0); } #ifdef PNG_sBIT_SUPPORTED png_uint_32 PNGAPI -png_get_sBIT(png_const_structp png_ptr, png_infop info_ptr, +png_get_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, png_color_8p *sig_bit) { png_debug1(1, "in %s retrieval function", "sBIT"); if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT) - && sig_bit != NULL) + && sig_bit != NULL) { *sig_bit = &(info_ptr->sig_bit); return (PNG_INFO_sBIT); } + return (0); } #endif #ifdef PNG_TEXT_SUPPORTED -png_uint_32 PNGAPI -png_get_text(png_const_structp png_ptr, png_const_infop info_ptr, +int PNGAPI +png_get_text(png_const_structrp png_ptr, png_inforp info_ptr, png_textp *text_ptr, int *num_text) { if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0) { - png_debug1(1, "in %s retrieval function", - (png_ptr->chunk_name[0] == '\0' ? "text" - : (png_const_charp)png_ptr->chunk_name)); + png_debug1(1, "in 0x%lx retrieval function", + (unsigned long)png_ptr->chunk_name); if (text_ptr != NULL) *text_ptr = info_ptr->text; @@ -781,17 +989,19 @@ png_get_text(png_const_structp png_ptr, png_const_infop info_ptr, if (num_text != NULL) *num_text = info_ptr->num_text; - return ((png_uint_32)info_ptr->num_text); + return info_ptr->num_text; } + if (num_text != NULL) - *num_text = 0; + *num_text = 0; + return(0); } #endif #ifdef PNG_tIME_SUPPORTED png_uint_32 PNGAPI -png_get_tIME(png_const_structp png_ptr, png_infop info_ptr, +png_get_tIME(png_const_structrp png_ptr, png_inforp info_ptr, png_timep *mod_time) { png_debug1(1, "in %s retrieval function", "tIME"); @@ -802,14 +1012,15 @@ png_get_tIME(png_const_structp png_ptr, png_infop info_ptr, *mod_time = &(info_ptr->mod_time); return (PNG_INFO_tIME); } + return (0); } #endif #ifdef PNG_tRNS_SUPPORTED png_uint_32 PNGAPI -png_get_tRNS(png_const_structp png_ptr, png_infop info_ptr, - png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color) +png_get_tRNS(png_const_structrp png_ptr, png_inforp info_ptr, + png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color) { png_uint_32 retval = 0; if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) @@ -818,114 +1029,149 @@ png_get_tRNS(png_const_structp png_ptr, png_infop info_ptr, if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { - if (trans_alpha != NULL) - { - *trans_alpha = info_ptr->trans_alpha; - retval |= PNG_INFO_tRNS; - } + if (trans_alpha != NULL) + { + *trans_alpha = info_ptr->trans_alpha; + retval |= PNG_INFO_tRNS; + } - if (trans_color != NULL) - *trans_color = &(info_ptr->trans_color); + if (trans_color != NULL) + *trans_color = &(info_ptr->trans_color); } + else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */ { - if (trans_color != NULL) - { - *trans_color = &(info_ptr->trans_color); - retval |= PNG_INFO_tRNS; - } + if (trans_color != NULL) + { + *trans_color = &(info_ptr->trans_color); + retval |= PNG_INFO_tRNS; + } - if (trans_alpha != NULL) - *trans_alpha = NULL; + if (trans_alpha != NULL) + *trans_alpha = NULL; } + if (num_trans != NULL) { *num_trans = info_ptr->num_trans; retval |= PNG_INFO_tRNS; } } + return (retval); } #endif -#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED -png_uint_32 PNGAPI -png_get_unknown_chunks(png_const_structp png_ptr, png_const_infop info_ptr, - png_unknown_chunkpp unknowns) +#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED +int PNGAPI +png_get_unknown_chunks(png_const_structrp png_ptr, png_inforp info_ptr, + png_unknown_chunkpp unknowns) { if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL) { - *unknowns = info_ptr->unknown_chunks; - return ((png_uint_32)info_ptr->unknown_chunks_num); + *unknowns = info_ptr->unknown_chunks; + return info_ptr->unknown_chunks_num; } + return (0); } #endif #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED png_byte PNGAPI -png_get_rgb_to_gray_status(png_const_structp png_ptr) +png_get_rgb_to_gray_status (png_const_structrp png_ptr) { - return (png_byte)(png_ptr? png_ptr->rgb_to_gray_status : 0); + return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0); } #endif #ifdef PNG_USER_CHUNKS_SUPPORTED png_voidp PNGAPI -png_get_user_chunk_ptr(png_const_structp png_ptr) +png_get_user_chunk_ptr(png_const_structrp png_ptr) { - return (png_ptr? png_ptr->user_chunk_ptr : NULL); + return (png_ptr ? png_ptr->user_chunk_ptr : NULL); } #endif png_size_t PNGAPI -png_get_compression_buffer_size(png_const_structp png_ptr) +png_get_compression_buffer_size(png_const_structrp png_ptr) { - return (png_ptr ? png_ptr->zbuf_size : 0L); -} + if (png_ptr == NULL) + return 0; +# ifdef PNG_WRITE_SUPPORTED + if (png_ptr->mode & PNG_IS_READ_STRUCT) +# endif + { +# ifdef PNG_SEQUENTIAL_READ_SUPPORTED + return png_ptr->IDAT_read_size; +# else + return PNG_IDAT_READ_SIZE; +# endif + } + +# ifdef PNG_WRITE_SUPPORTED + else + return png_ptr->zbuffer_size; +# endif +} #ifdef PNG_SET_USER_LIMITS_SUPPORTED /* These functions were added to libpng 1.2.6 and were enabled * by default in libpng-1.4.0 */ png_uint_32 PNGAPI -png_get_user_width_max(png_const_structp png_ptr) +png_get_user_width_max (png_const_structrp png_ptr) { - return (png_ptr? png_ptr->user_width_max : 0); + return (png_ptr ? png_ptr->user_width_max : 0); } + png_uint_32 PNGAPI -png_get_user_height_max(png_const_structp png_ptr) +png_get_user_height_max (png_const_structrp png_ptr) { - return (png_ptr? png_ptr->user_height_max : 0); + return (png_ptr ? png_ptr->user_height_max : 0); } + /* This function was added to libpng 1.4.0 */ png_uint_32 PNGAPI -png_get_chunk_cache_max(png_const_structp png_ptr) +png_get_chunk_cache_max (png_const_structrp png_ptr) { - return (png_ptr? png_ptr->user_chunk_cache_max : 0); + return (png_ptr ? png_ptr->user_chunk_cache_max : 0); } + /* This function was added to libpng 1.4.1 */ png_alloc_size_t PNGAPI -png_get_chunk_malloc_max(png_const_structp png_ptr) +png_get_chunk_malloc_max (png_const_structrp png_ptr) { - return (png_ptr? - png_ptr->user_chunk_malloc_max : 0); + return (png_ptr ? png_ptr->user_chunk_malloc_max : 0); } #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */ /* These functions were added to libpng 1.4.0 */ #ifdef PNG_IO_STATE_SUPPORTED png_uint_32 PNGAPI -png_get_io_state(png_const_structp png_ptr) +png_get_io_state (png_const_structrp png_ptr) { - return png_ptr->io_state; + return png_ptr->io_state; } -png_bytep PNGAPI -png_get_io_chunk_name(png_structp png_ptr) +png_uint_32 PNGAPI +png_get_io_chunk_type (png_const_structrp png_ptr) { return png_ptr->chunk_name; } #endif /* ?PNG_IO_STATE_SUPPORTED */ +#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED +# ifdef PNG_GET_PALETTE_MAX_SUPPORTED +int PNGAPI +png_get_palette_max(png_const_structp png_ptr, png_const_infop info_ptr) +{ + if (png_ptr != NULL && info_ptr != NULL) + return png_ptr->num_palette_max; + + return (-1); +} +# endif +#endif + #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ diff --git a/project/jni/png/pngmem.c b/project/jni/png/pngmem.c index 63b581cab..b9b3efb44 100644 --- a/project/jni/png/pngmem.c +++ b/project/jni/png/pngmem.c @@ -1,8 +1,8 @@ /* pngmem.c - stub functions for memory allocation * - * Last changed in libpng 1.4.6 [January 23, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.0 [February 14, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -17,421 +17,26 @@ * identify the replacement functions. */ -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" -#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) #include "pngpriv.h" -/* Borland DOS special memory handler */ -#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) -/* If you change this, be sure to change the one in png.h also */ - -/* Allocate memory for a png_struct. The malloc and memset can be replaced - by a single call to calloc() if this is thought to improve performance. */ -png_voidp /* PRIVATE */ -png_create_struct(int type) -{ -#ifdef PNG_USER_MEM_SUPPORTED - return (png_create_struct_2(type, NULL, NULL)); -} - -/* Alternate version of png_create_struct, for use with user-defined malloc. */ -png_voidp /* PRIVATE */ -png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr) -{ -#endif /* PNG_USER_MEM_SUPPORTED */ - png_size_t size; - png_voidp struct_ptr; - - if (type == PNG_STRUCT_INFO) - size = png_sizeof(png_info); - else if (type == PNG_STRUCT_PNG) - size = png_sizeof(png_struct); - else - return (png_get_copyright(NULL)); - -#ifdef PNG_USER_MEM_SUPPORTED - if (malloc_fn != NULL) - { - png_struct dummy_struct; - png_structp png_ptr = &dummy_struct; - png_ptr->mem_ptr=mem_ptr; - struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size); - } - else -#endif /* PNG_USER_MEM_SUPPORTED */ - struct_ptr = (png_voidp)farmalloc(size); - if (struct_ptr != NULL) - png_memset(struct_ptr, 0, size); - return (struct_ptr); -} - -/* Free memory allocated by a png_create_struct() call */ +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) +/* Free a png_struct */ void /* PRIVATE */ -png_destroy_struct(png_voidp struct_ptr) +png_destroy_png_struct(png_structrp png_ptr) { -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2(struct_ptr, NULL, NULL); -} - -/* Free memory allocated by a png_create_struct() call */ -void /* PRIVATE */ -png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn, - png_voidp mem_ptr) -{ -#endif - if (struct_ptr != NULL) + if (png_ptr != NULL) { -#ifdef PNG_USER_MEM_SUPPORTED - if (free_fn != NULL) - { - png_struct dummy_struct; - png_structp png_ptr = &dummy_struct; - png_ptr->mem_ptr=mem_ptr; - (*(free_fn))(png_ptr, struct_ptr); - return; - } -#endif /* PNG_USER_MEM_SUPPORTED */ - farfree (struct_ptr); - } -} + /* png_free might call png_error and may certainly call + * png_get_mem_ptr, so fake a temporary png_struct to support this. + */ + png_struct dummy_struct = *png_ptr; + memset(png_ptr, 0, (sizeof *png_ptr)); + png_free(&dummy_struct, png_ptr); -/* Allocate memory. For reasonable files, size should never exceed - * 64K. However, zlib may allocate more then 64K if you don't tell - * it not to. See zconf.h and png.h for more information. zlib does - * need to allocate exactly 64K, so whatever you call here must - * have the ability to do that. - * - * Borland seems to have a problem in DOS mode for exactly 64K. - * It gives you a segment with an offset of 8 (perhaps to store its - * memory stuff). zlib doesn't like this at all, so we have to - * detect and deal with it. This code should not be needed in - * Windows or OS/2 modes, and only in 16 bit mode. This code has - * been updated by Alexander Lehmann for version 0.89 to waste less - * memory. - * - * Note that we can't use png_size_t for the "size" declaration, - * since on some systems a png_size_t is a 16-bit quantity, and as a - * result, we would be truncating potentially larger memory requests - * (which should cause a fatal error) and introducing major problems. - */ -png_voidp PNGAPI -png_calloc(png_structp png_ptr, png_alloc_size_t size) -{ - png_voidp ret; - - ret = (png_malloc(png_ptr, size)); - if (ret != NULL) - png_memset(ret,0,(png_size_t)size); - return (ret); -} - -png_voidp PNGAPI -png_malloc(png_structp png_ptr, png_alloc_size_t size) -{ - png_voidp ret; - - if (png_ptr == NULL || size == 0) - return (NULL); - -#ifdef PNG_USER_MEM_SUPPORTED - if (png_ptr->malloc_fn != NULL) - ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size)); - else - ret = (png_malloc_default(png_ptr, size)); - if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out of memory"); - return (ret); -} - -png_voidp PNGAPI -png_malloc_default(png_structp png_ptr, png_alloc_size_t size) -{ - png_voidp ret; -#endif /* PNG_USER_MEM_SUPPORTED */ - - if (png_ptr == NULL || size == 0) - return (NULL); - -#ifdef PNG_MAX_MALLOC_64K - if (size > (png_uint_32)65536L) - { - png_warning(png_ptr, "Cannot Allocate > 64K"); - ret = NULL; - } - else -#endif - - if (size != (size_t)size) - ret = NULL; - else if (size == (png_uint_32)65536L) - { - if (png_ptr->offset_table == NULL) - { - /* Try to see if we need to do any of this fancy stuff */ - ret = farmalloc(size); - if (ret == NULL || ((png_size_t)ret & 0xffff)) - { - int num_blocks; - png_uint_32 total_size; - png_bytep table; - int i; - png_byte huge * hptr; - - if (ret != NULL) - { - farfree(ret); - ret = NULL; - } - - if (png_ptr->zlib_window_bits > 14) - num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14)); - else - num_blocks = 1; - if (png_ptr->zlib_mem_level >= 7) - num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7)); - else - num_blocks++; - - total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16; - - table = farmalloc(total_size); - - if (table == NULL) - { -#ifndef PNG_USER_MEM_SUPPORTED - if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out Of Memory"); /* Note "O", "M" */ - else - png_warning(png_ptr, "Out Of Memory"); -#endif - return (NULL); - } - - if ((png_size_t)table & 0xfff0) - { -#ifndef PNG_USER_MEM_SUPPORTED - if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, - "Farmalloc didn't return normalized pointer"); - else - png_warning(png_ptr, - "Farmalloc didn't return normalized pointer"); -#endif - return (NULL); - } - - png_ptr->offset_table = table; - png_ptr->offset_table_ptr = farmalloc(num_blocks * - png_sizeof(png_bytep)); - - if (png_ptr->offset_table_ptr == NULL) - { -#ifndef PNG_USER_MEM_SUPPORTED - if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out Of memory"); /* Note "O", "m" */ - else - png_warning(png_ptr, "Out Of memory"); -#endif - return (NULL); - } - - hptr = (png_byte huge *)table; - if ((png_size_t)hptr & 0xf) - { - hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L); - hptr = hptr + 16L; /* "hptr += 16L" fails on Turbo C++ 3.0 */ - } - for (i = 0; i < num_blocks; i++) - { - png_ptr->offset_table_ptr[i] = (png_bytep)hptr; - hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */ - } - - png_ptr->offset_table_number = num_blocks; - png_ptr->offset_table_count = 0; - png_ptr->offset_table_count_free = 0; - } - } - - if (png_ptr->offset_table_count >= png_ptr->offset_table_number) - { -#ifndef PNG_USER_MEM_SUPPORTED - if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out of Memory"); /* Note "o" and "M" */ - else - png_warning(png_ptr, "Out of Memory"); -#endif - return (NULL); - } - - ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++]; - } - else - ret = farmalloc(size); - -#ifndef PNG_USER_MEM_SUPPORTED - if (ret == NULL) - { - if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out of memory"); /* Note "o" and "m" */ - else - png_warning(png_ptr, "Out of memory"); /* Note "o" and "m" */ - } -#endif - - return (ret); -} - -/* Free a pointer allocated by png_malloc(). In the default - * configuration, png_ptr is not used, but is passed in case it - * is needed. If ptr is NULL, return without taking any action. - */ -void PNGAPI -png_free(png_structp png_ptr, png_voidp ptr) -{ - if (png_ptr == NULL || ptr == NULL) - return; - -#ifdef PNG_USER_MEM_SUPPORTED - if (png_ptr->free_fn != NULL) - { - (*(png_ptr->free_fn))(png_ptr, ptr); - return; - } - else - png_free_default(png_ptr, ptr); -} - -void PNGAPI -png_free_default(png_structp png_ptr, png_voidp ptr) -{ -#endif /* PNG_USER_MEM_SUPPORTED */ - - if (png_ptr == NULL || ptr == NULL) - return; - - if (png_ptr->offset_table != NULL) - { - int i; - - for (i = 0; i < png_ptr->offset_table_count; i++) - { - if (ptr == png_ptr->offset_table_ptr[i]) - { - ptr = NULL; - png_ptr->offset_table_count_free++; - break; - } - } - if (png_ptr->offset_table_count_free == png_ptr->offset_table_count) - { - farfree(png_ptr->offset_table); - farfree(png_ptr->offset_table_ptr); - png_ptr->offset_table = NULL; - png_ptr->offset_table_ptr = NULL; - } - } - - if (ptr != NULL) - { - farfree(ptr); - } -} - -#else /* Not the Borland DOS special memory handler */ - -/* Allocate memory for a png_struct or a png_info. The malloc and - memset can be replaced by a single call to calloc() if this is thought - to improve performance noticably. */ -png_voidp /* PRIVATE */ -png_create_struct(int type) -{ -#ifdef PNG_USER_MEM_SUPPORTED - return (png_create_struct_2(type, NULL, NULL)); -} - -/* Allocate memory for a png_struct or a png_info. The malloc and - memset can be replaced by a single call to calloc() if this is thought - to improve performance noticably. */ -png_voidp /* PRIVATE */ -png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr) -{ -#endif /* PNG_USER_MEM_SUPPORTED */ - png_size_t size; - png_voidp struct_ptr; - - if (type == PNG_STRUCT_INFO) - size = png_sizeof(png_info); - else if (type == PNG_STRUCT_PNG) - size = png_sizeof(png_struct); - else - return (NULL); - -#ifdef PNG_USER_MEM_SUPPORTED - if (malloc_fn != NULL) - { - png_struct dummy_struct; - png_structp png_ptr = &dummy_struct; - png_ptr->mem_ptr=mem_ptr; - struct_ptr = (*(malloc_fn))(png_ptr, size); - if (struct_ptr != NULL) - png_memset(struct_ptr, 0, size); - return (struct_ptr); - } -#endif /* PNG_USER_MEM_SUPPORTED */ - -#if defined(__TURBOC__) && !defined(__FLAT__) - struct_ptr = (png_voidp)farmalloc(size); -#else -# if defined(_MSC_VER) && defined(MAXSEG_64K) - struct_ptr = (png_voidp)halloc(size, 1); -# else - struct_ptr = (png_voidp)malloc(size); -# endif -#endif - if (struct_ptr != NULL) - png_memset(struct_ptr, 0, size); - - return (struct_ptr); -} - - -/* Free memory allocated by a png_create_struct() call */ -void /* PRIVATE */ -png_destroy_struct(png_voidp struct_ptr) -{ -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2(struct_ptr, NULL, NULL); -} - -/* Free memory allocated by a png_create_struct() call */ -void /* PRIVATE */ -png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn, - png_voidp mem_ptr) -{ -#endif /* PNG_USER_MEM_SUPPORTED */ - if (struct_ptr != NULL) - { -#ifdef PNG_USER_MEM_SUPPORTED - if (free_fn != NULL) - { - png_struct dummy_struct; - png_structp png_ptr = &dummy_struct; - png_ptr->mem_ptr=mem_ptr; - (*(free_fn))(png_ptr, struct_ptr); - return; - } -#endif /* PNG_USER_MEM_SUPPORTED */ -#if defined(__TURBOC__) && !defined(__FLAT__) - farfree(struct_ptr); -#else -# if defined(_MSC_VER) && defined(MAXSEG_64K) - hfree(struct_ptr); -# else - free(struct_ptr); -# endif -#endif +# ifdef PNG_SETJMP_SUPPORTED + /* We may have a jmp_buf left to deallocate. */ + png_free_jmpbuf(&dummy_struct); +# endif } } @@ -441,151 +46,211 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn, * need to allocate exactly 64K, so whatever you call here must * have the ability to do that. */ - -png_voidp PNGAPI -png_calloc(png_structp png_ptr, png_alloc_size_t size) +PNG_FUNCTION(png_voidp,PNGAPI +png_calloc,(png_const_structrp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) { png_voidp ret; - ret = (png_malloc(png_ptr, size)); + ret = png_malloc(png_ptr, size); + if (ret != NULL) - png_memset(ret,0,(png_size_t)size); - return (ret); + memset(ret, 0, size); + + return ret; } -png_voidp PNGAPI -png_malloc(png_structp png_ptr, png_alloc_size_t size) +/* png_malloc_base, an internal function added at libpng 1.6.0, does the work of + * allocating memory, taking into account limits and PNG_USER_MEM_SUPPORTED. + * Checking and error handling must happen outside this routine; it returns NULL + * if the allocation cannot be done (for any reason.) + */ +PNG_FUNCTION(png_voidp /* PRIVATE */, +png_malloc_base,(png_const_structrp png_ptr, png_alloc_size_t size), + PNG_ALLOCATED) { - png_voidp ret; - + /* Moved to png_malloc_base from png_malloc_default in 1.6.0; the DOS + * allocators have also been removed in 1.6.0, so any 16-bit system now has + * to implement a user memory handler. This checks to be sure it isn't + * called with big numbers. + */ #ifdef PNG_USER_MEM_SUPPORTED - if (png_ptr == NULL || size == 0) - return (NULL); - - if (png_ptr->malloc_fn != NULL) - ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size)); - else - ret = (png_malloc_default(png_ptr, size)); - if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out of Memory"); - return (ret); -} - -png_voidp PNGAPI -png_malloc_default(png_structp png_ptr, png_alloc_size_t size) -{ - png_voidp ret; -#endif /* PNG_USER_MEM_SUPPORTED */ - - if (png_ptr == NULL || size == 0) - return (NULL); - -#ifdef PNG_MAX_MALLOC_64K - if (size > (png_uint_32)65536L) + PNG_UNUSED(png_ptr) +#endif + if (size > 0 && size <= PNG_SIZE_MAX +# ifdef PNG_MAX_MALLOC_64K + && size <= 65536U +# endif + ) { -#ifndef PNG_USER_MEM_SUPPORTED - if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Cannot Allocate > 64K"); +#ifdef PNG_USER_MEM_SUPPORTED + if (png_ptr != NULL && png_ptr->malloc_fn != NULL) + return png_ptr->malloc_fn(png_constcast(png_structrp,png_ptr), size); + else #endif - return NULL; + return malloc((size_t)size); /* checked for truncation above */ } -#endif - /* Check for overflow */ -#if defined(__TURBOC__) && !defined(__FLAT__) - if (size != (unsigned long)size) - ret = NULL; else - ret = farmalloc(size); -#else -# if defined(_MSC_VER) && defined(MAXSEG_64K) - if (size != (unsigned long)size) - ret = NULL; - else - ret = halloc(size, 1); -# else - if (size != (size_t)size) - ret = NULL; - else - ret = malloc((size_t)size); -# endif -#endif + return NULL; +} -#ifndef PNG_USER_MEM_SUPPORTED - if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out of Memory"); -#endif +/* This is really here only to work round a spurious warning in GCC 4.6 and 4.7 + * that arises because of the checks in png_realloc_array that are repeated in + * png_malloc_array. + */ +static png_voidp +png_malloc_array_checked(png_const_structrp png_ptr, int nelements, + size_t element_size) +{ + png_alloc_size_t req = nelements; /* known to be > 0 */ - return (ret); + if (req <= PNG_SIZE_MAX/element_size) + return png_malloc_base(png_ptr, req * element_size); + + /* The failure case when the request is too large */ + return NULL; +} + +PNG_FUNCTION(png_voidp /* PRIVATE */, +png_malloc_array,(png_const_structrp png_ptr, int nelements, + size_t element_size),PNG_ALLOCATED) +{ + if (nelements <= 0 || element_size == 0) + png_error(png_ptr, "internal error: array alloc"); + + return png_malloc_array_checked(png_ptr, nelements, element_size); +} + +PNG_FUNCTION(png_voidp /* PRIVATE */, +png_realloc_array,(png_const_structrp png_ptr, png_const_voidp old_array, + int old_elements, int add_elements, size_t element_size),PNG_ALLOCATED) +{ + /* These are internal errors: */ + if (add_elements <= 0 || element_size == 0 || old_elements < 0 || + (old_array == NULL && old_elements > 0)) + png_error(png_ptr, "internal error: array realloc"); + + /* Check for overflow on the elements count (so the caller does not have to + * check.) + */ + if (add_elements <= INT_MAX - old_elements) + { + png_voidp new_array = png_malloc_array_checked(png_ptr, + old_elements+add_elements, element_size); + + if (new_array != NULL) + { + /* Because png_malloc_array worked the size calculations below cannot + * overflow. + */ + if (old_elements > 0) + memcpy(new_array, old_array, element_size*(unsigned)old_elements); + + memset((char*)new_array + element_size*(unsigned)old_elements, 0, + element_size*(unsigned)add_elements); + + return new_array; + } + } + + return NULL; /* error */ +} + +/* Various functions that have different error handling are derived from this. + * png_malloc always exists, but if PNG_USER_MEM_SUPPORTED is defined a separate + * function png_malloc_default is also provided. + */ +PNG_FUNCTION(png_voidp,PNGAPI +png_malloc,(png_const_structrp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) +{ + png_voidp ret; + + if (png_ptr == NULL) + return NULL; + + ret = png_malloc_base(png_ptr, size); + + if (ret == NULL) + png_error(png_ptr, "Out of memory"); /* 'm' means png_malloc */ + + return ret; +} + +#ifdef PNG_USER_MEM_SUPPORTED +PNG_FUNCTION(png_voidp,PNGAPI +png_malloc_default,(png_const_structrp png_ptr, png_alloc_size_t size), + PNG_ALLOCATED PNG_DEPRECATED) +{ + png_voidp ret; + + if (png_ptr == NULL) + return NULL; + + /* Passing 'NULL' here bypasses the application provided memory handler. */ + ret = png_malloc_base(NULL/*use malloc*/, size); + + if (ret == NULL) + png_error(png_ptr, "Out of Memory"); /* 'M' means png_malloc_default */ + + return ret; +} +#endif /* PNG_USER_MEM_SUPPORTED */ + +/* This function was added at libpng version 1.2.3. The png_malloc_warn() + * function will issue a png_warning and return NULL instead of issuing a + * png_error, if it fails to allocate the requested memory. + */ +PNG_FUNCTION(png_voidp,PNGAPI +png_malloc_warn,(png_const_structrp png_ptr, png_alloc_size_t size), + PNG_ALLOCATED) +{ + if (png_ptr != NULL) + { + png_voidp ret = png_malloc_base(png_ptr, size); + + if (ret != NULL) + return ret; + + png_warning(png_ptr, "Out of memory"); + } + + return NULL; } /* Free a pointer allocated by png_malloc(). If ptr is NULL, return * without taking any action. */ void PNGAPI -png_free(png_structp png_ptr, png_voidp ptr) +png_free(png_const_structrp png_ptr, png_voidp ptr) { if (png_ptr == NULL || ptr == NULL) return; #ifdef PNG_USER_MEM_SUPPORTED if (png_ptr->free_fn != NULL) - { - (*(png_ptr->free_fn))(png_ptr, ptr); - return; - } + png_ptr->free_fn(png_constcast(png_structrp,png_ptr), ptr); + else png_free_default(png_ptr, ptr); } -void PNGAPI -png_free_default(png_structp png_ptr, png_voidp ptr) + +PNG_FUNCTION(void,PNGAPI +png_free_default,(png_const_structrp png_ptr, png_voidp ptr),PNG_DEPRECATED) { if (png_ptr == NULL || ptr == NULL) return; - #endif /* PNG_USER_MEM_SUPPORTED */ -#if defined(__TURBOC__) && !defined(__FLAT__) - farfree(ptr); -#else -# if defined(_MSC_VER) && defined(MAXSEG_64K) - hfree(ptr); -# else free(ptr); -# endif -#endif } -#endif /* Not Borland DOS special memory handler */ - -/* This function was added at libpng version 1.2.3. The png_malloc_warn() - * function will set up png_malloc() to issue a png_warning and return NULL - * instead of issuing a png_error, if it fails to allocate the requested - * memory. - */ -png_voidp PNGAPI -png_malloc_warn(png_structp png_ptr, png_alloc_size_t size) -{ - png_voidp ptr; - png_uint_32 save_flags; - if (png_ptr == NULL) - return (NULL); - - save_flags = png_ptr->flags; - png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK; - ptr = (png_voidp)png_malloc((png_structp)png_ptr, size); - png_ptr->flags=save_flags; - return(ptr); -} - - #ifdef PNG_USER_MEM_SUPPORTED /* This function is called when the application wants to use another method * of allocating and freeing memory. */ void PNGAPI -png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr +png_set_mem_fn(png_structrp png_ptr, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn) { if (png_ptr != NULL) @@ -601,11 +266,12 @@ png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr * pointer before png_write_destroy and png_read_destroy are called. */ png_voidp PNGAPI -png_get_mem_ptr(png_const_structp png_ptr) +png_get_mem_ptr(png_const_structrp png_ptr) { if (png_ptr == NULL) - return (NULL); - return ((png_voidp)png_ptr->mem_ptr); + return NULL; + + return png_ptr->mem_ptr; } #endif /* PNG_USER_MEM_SUPPORTED */ #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ diff --git a/project/jni/png/pngpread.c b/project/jni/png/pngpread.c index fa4d3b117..0169ecb2c 100644 --- a/project/jni/png/pngpread.c +++ b/project/jni/png/pngpread.c @@ -1,8 +1,8 @@ /* pngpread.c - read a png file in push mode * - * Last changed in libpng 1.4.6 [January 23, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.0 [February 14, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -11,11 +11,10 @@ * and license in png.h */ -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" -#ifdef PNG_PROGRESSIVE_READ_SUPPORTED #include "pngpriv.h" +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED + /* Push model modes */ #define PNG_READ_SIG_MODE 0 #define PNG_READ_CHUNK_MODE 1 @@ -28,8 +27,8 @@ #define PNG_ERROR_MODE 8 void PNGAPI -png_process_data(png_structp png_ptr, png_infop info_ptr, - png_bytep buffer, png_size_t buffer_size) +png_process_data(png_structrp png_ptr, png_inforp info_ptr, + png_bytep buffer, png_size_t buffer_size) { if (png_ptr == NULL || info_ptr == NULL) return; @@ -42,11 +41,69 @@ png_process_data(png_structp png_ptr, png_infop info_ptr, } } +png_size_t PNGAPI +png_process_data_pause(png_structrp png_ptr, int save) +{ + if (png_ptr != NULL) + { + /* It's easiest for the caller if we do the save, then the caller doesn't + * have to supply the same data again: + */ + if (save) + png_push_save_buffer(png_ptr); + else + { + /* This includes any pending saved bytes: */ + png_size_t remaining = png_ptr->buffer_size; + png_ptr->buffer_size = 0; + + /* So subtract the saved buffer size, unless all the data + * is actually 'saved', in which case we just return 0 + */ + if (png_ptr->save_buffer_size < remaining) + return remaining - png_ptr->save_buffer_size; + } + } + + return 0; +} + +png_uint_32 PNGAPI +png_process_data_skip(png_structrp png_ptr) +{ + png_uint_32 remaining = 0; + + if (png_ptr != NULL && png_ptr->process_mode == PNG_SKIP_MODE && + png_ptr->skip_length > 0) + { + /* At the end of png_process_data the buffer size must be 0 (see the loop + * above) so we can detect a broken call here: + */ + if (png_ptr->buffer_size != 0) + png_error(png_ptr, + "png_process_data_skip called inside png_process_data"); + + /* If is impossible for there to be a saved buffer at this point - + * otherwise we could not be in SKIP mode. This will also happen if + * png_process_skip is called inside png_process_data (but only very + * rarely.) + */ + if (png_ptr->save_buffer_size != 0) + png_error(png_ptr, "png_process_data_skip called with saved data"); + + remaining = png_ptr->skip_length; + png_ptr->skip_length = 0; + png_ptr->process_mode = PNG_READ_CHUNK_MODE; + } + + return remaining; +} + /* What we do with the incoming data depends on what we were previously * doing before we ran out of data... */ void /* PRIVATE */ -png_process_some_data(png_structp png_ptr, png_infop info_ptr) +png_process_some_data(png_structrp png_ptr, png_inforp info_ptr) { if (png_ptr == NULL) return; @@ -71,30 +128,6 @@ png_process_some_data(png_structp png_ptr, png_infop info_ptr) break; } -#ifdef PNG_READ_tEXt_SUPPORTED - case PNG_READ_tEXt_MODE: - { - png_push_read_tEXt(png_ptr, info_ptr); - break; - } - -#endif -#ifdef PNG_READ_zTXt_SUPPORTED - case PNG_READ_zTXt_MODE: - { - png_push_read_zTXt(png_ptr, info_ptr); - break; - } - -#endif -#ifdef PNG_READ_iTXt_SUPPORTED - case PNG_READ_iTXt_MODE: - { - png_push_read_iTXt(png_ptr, info_ptr); - break; - } - -#endif case PNG_SKIP_MODE: { png_push_crc_finish(png_ptr); @@ -116,9 +149,9 @@ png_process_some_data(png_structp png_ptr, png_infop info_ptr) * routine. */ void /* PRIVATE */ -png_push_read_sig(png_structp png_ptr, png_infop info_ptr) +png_push_read_sig(png_structrp png_ptr, png_inforp info_ptr) { - png_size_t num_checked = png_ptr->sig_bytes, + png_size_t num_checked = png_ptr->sig_bytes, /* SAFE, does not exceed 8 */ num_to_check = 8 - num_checked; if (png_ptr->buffer_size < num_to_check) @@ -127,7 +160,7 @@ png_push_read_sig(png_structp png_ptr, png_infop info_ptr) } png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]), - num_to_check); + num_to_check); png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes + num_to_check); if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) @@ -135,6 +168,7 @@ png_push_read_sig(png_structp png_ptr, png_infop info_ptr) if (num_checked < 4 && png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) png_error(png_ptr, "Not a PNG file"); + else png_error(png_ptr, "PNG file corrupted by ASCII conversion"); } @@ -148,62 +182,11 @@ png_push_read_sig(png_structp png_ptr, png_infop info_ptr) } void /* PRIVATE */ -png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) +png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr) { - PNG_IHDR; - PNG_IDAT; - PNG_IEND; - PNG_PLTE; -#ifdef PNG_READ_bKGD_SUPPORTED - PNG_bKGD; -#endif -#ifdef PNG_READ_cHRM_SUPPORTED - PNG_cHRM; -#endif -#ifdef PNG_READ_gAMA_SUPPORTED - PNG_gAMA; -#endif -#ifdef PNG_READ_hIST_SUPPORTED - PNG_hIST; -#endif -#ifdef PNG_READ_iCCP_SUPPORTED - PNG_iCCP; -#endif -#ifdef PNG_READ_iTXt_SUPPORTED - PNG_iTXt; -#endif -#ifdef PNG_READ_oFFs_SUPPORTED - PNG_oFFs; -#endif -#ifdef PNG_READ_pCAL_SUPPORTED - PNG_pCAL; -#endif -#ifdef PNG_READ_pHYs_SUPPORTED - PNG_pHYs; -#endif -#ifdef PNG_READ_sBIT_SUPPORTED - PNG_sBIT; -#endif -#ifdef PNG_READ_sCAL_SUPPORTED - PNG_sCAL; -#endif -#ifdef PNG_READ_sRGB_SUPPORTED - PNG_sRGB; -#endif -#ifdef PNG_READ_sPLT_SUPPORTED - PNG_sPLT; -#endif -#ifdef PNG_READ_tEXt_SUPPORTED - PNG_tEXt; -#endif -#ifdef PNG_READ_tIME_SUPPORTED - PNG_tIME; -#endif -#ifdef PNG_READ_tRNS_SUPPORTED - PNG_tRNS; -#endif -#ifdef PNG_READ_zTXt_SUPPORTED - PNG_zTXt; + png_uint_32 chunk_name; +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + int keep; /* unknown handling method */ #endif /* First we make sure we have enough data for the 4 byte chunk name @@ -215,6 +198,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER)) { png_byte chunk_length[4]; + png_byte chunk_tag[4]; if (png_ptr->buffer_size < 8) { @@ -225,16 +209,41 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) png_push_fill_buffer(png_ptr, chunk_length, 4); png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length); png_reset_crc(png_ptr); - png_crc_read(png_ptr, png_ptr->chunk_name, 4); + png_crc_read(png_ptr, chunk_tag, 4); + png_ptr->chunk_name = PNG_CHUNK_FROM_STRING(chunk_tag); png_check_chunk_name(png_ptr, png_ptr->chunk_name); png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; } - if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) - if (png_ptr->mode & PNG_AFTER_IDAT) - png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; + chunk_name = png_ptr->chunk_name; - if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) + if (chunk_name == png_IDAT) + { + if (png_ptr->mode & PNG_AFTER_IDAT) + png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; + + /* If we reach an IDAT chunk, this means we have read all of the + * header chunks, and we can start reading the image (or if this + * is called after the image has been read - we have an error). + */ + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before IDAT"); + + else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + !(png_ptr->mode & PNG_HAVE_PLTE)) + png_error(png_ptr, "Missing PLTE before IDAT"); + + png_ptr->mode |= PNG_HAVE_IDAT; + + if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) + if (png_ptr->push_length == 0) + return; + + if (png_ptr->mode & PNG_AFTER_IDAT) + png_benign_error(png_ptr, "Too many IDATs found"); + } + + if (chunk_name == png_IHDR) { if (png_ptr->push_length != 13) png_error(png_ptr, "Invalid IHDR length"); @@ -248,7 +257,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length); } - else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) + else if (chunk_name == png_IEND) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -263,7 +272,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) } #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name)) + else if ((keep = png_chunk_unknown_handling(png_ptr, chunk_name)) != 0) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -271,27 +280,14 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) return; } - if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) - png_ptr->mode |= PNG_HAVE_IDAT; + png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length, keep); - png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); - - if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) + if (chunk_name == png_PLTE) png_ptr->mode |= PNG_HAVE_PLTE; - - else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) - { - if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before IDAT"); - - else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && - !(png_ptr->mode & PNG_HAVE_PLTE)) - png_error(png_ptr, "Missing PLTE before IDAT"); - } } #endif - else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) + else if (chunk_name == png_PLTE) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -301,32 +297,9 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length); } - else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + else if (chunk_name == png_IDAT) { - /* If we reach an IDAT chunk, this means we have read all of the - * header chunks, and we can start reading the image (or if this - * is called after the image has been read - we have an error). - */ - - if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before IDAT"); - - else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && - !(png_ptr->mode & PNG_HAVE_PLTE)) - png_error(png_ptr, "Missing PLTE before IDAT"); - - if (png_ptr->mode & PNG_HAVE_IDAT) - { - if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) - if (png_ptr->push_length == 0) - return; - - if (png_ptr->mode & PNG_AFTER_IDAT) - png_benign_error(png_ptr, "Too many IDATs found"); - } - png_ptr->idat_size = png_ptr->push_length; - png_ptr->mode |= PNG_HAVE_IDAT; png_ptr->process_mode = PNG_READ_IDAT_MODE; png_push_have_info(png_ptr, info_ptr); png_ptr->zstream.avail_out = @@ -337,7 +310,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) } #ifdef PNG_READ_gAMA_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) + else if (png_ptr->chunk_name == png_gAMA) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -350,7 +323,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) #endif #ifdef PNG_READ_sBIT_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) + else if (png_ptr->chunk_name == png_sBIT) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -363,7 +336,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) #endif #ifdef PNG_READ_cHRM_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) + else if (png_ptr->chunk_name == png_cHRM) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -376,7 +349,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) #endif #ifdef PNG_READ_sRGB_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) + else if (chunk_name == png_sRGB) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -389,7 +362,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) #endif #ifdef PNG_READ_iCCP_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4)) + else if (png_ptr->chunk_name == png_iCCP) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -402,7 +375,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) #endif #ifdef PNG_READ_sPLT_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4)) + else if (chunk_name == png_sPLT) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -415,7 +388,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) #endif #ifdef PNG_READ_tRNS_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) + else if (chunk_name == png_tRNS) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -428,7 +401,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) #endif #ifdef PNG_READ_bKGD_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) + else if (chunk_name == png_bKGD) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -441,7 +414,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) #endif #ifdef PNG_READ_hIST_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) + else if (chunk_name == png_hIST) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -454,7 +427,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) #endif #ifdef PNG_READ_pHYs_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) + else if (chunk_name == png_pHYs) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -467,7 +440,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) #endif #ifdef PNG_READ_oFFs_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) + else if (chunk_name == png_oFFs) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -480,7 +453,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) #endif #ifdef PNG_READ_pCAL_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) + else if (chunk_name == png_pCAL) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -493,7 +466,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) #endif #ifdef PNG_READ_sCAL_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4)) + else if (chunk_name == png_sCAL) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -506,7 +479,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) #endif #ifdef PNG_READ_tIME_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) + else if (chunk_name == png_tIME) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -519,7 +492,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) #endif #ifdef PNG_READ_tEXt_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) + else if (chunk_name == png_tEXt) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -527,12 +500,12 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) return; } - png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length); + png_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length); } #endif #ifdef PNG_READ_zTXt_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) + else if (chunk_name == png_zTXt) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -540,12 +513,12 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) return; } - png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length); + png_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length); } #endif #ifdef PNG_READ_iTXt_SUPPORTED - else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4)) + else if (chunk_name == png_iTXt) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -553,7 +526,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) return; } - png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length); + png_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length); } #endif @@ -564,50 +537,64 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) png_push_save_buffer(png_ptr); return; } - png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); + png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length, + PNG_HANDLE_CHUNK_AS_DEFAULT); } png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; } void /* PRIVATE */ -png_push_crc_skip(png_structp png_ptr, png_uint_32 skip) +png_push_crc_skip(png_structrp png_ptr, png_uint_32 skip) { png_ptr->process_mode = PNG_SKIP_MODE; png_ptr->skip_length = skip; } void /* PRIVATE */ -png_push_crc_finish(png_structp png_ptr) +png_push_crc_finish(png_structrp png_ptr) { if (png_ptr->skip_length && png_ptr->save_buffer_size) { - png_size_t save_size; + png_size_t save_size = png_ptr->save_buffer_size; + png_uint_32 skip_length = png_ptr->skip_length; + + /* We want the smaller of 'skip_length' and 'save_buffer_size', but + * they are of different types and we don't know which variable has the + * fewest bits. Carefully select the smaller and cast it to the type of + * the larger - this cannot overflow. Do not cast in the following test + * - it will break on either 16 or 64 bit platforms. + */ + if (skip_length < save_size) + save_size = (png_size_t)skip_length; - if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size) - save_size = (png_size_t)png_ptr->skip_length; else - save_size = png_ptr->save_buffer_size; + skip_length = (png_uint_32)save_size; png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size); - png_ptr->skip_length -= save_size; + png_ptr->skip_length -= skip_length; png_ptr->buffer_size -= save_size; png_ptr->save_buffer_size -= save_size; png_ptr->save_buffer_ptr += save_size; } if (png_ptr->skip_length && png_ptr->current_buffer_size) { - png_size_t save_size; + png_size_t save_size = png_ptr->current_buffer_size; + png_uint_32 skip_length = png_ptr->skip_length; + + /* We want the smaller of 'skip_length' and 'current_buffer_size', here, + * the same problem exists as above and the same solution. + */ + if (skip_length < save_size) + save_size = (png_size_t)skip_length; - if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size) - save_size = (png_size_t)png_ptr->skip_length; else - save_size = png_ptr->current_buffer_size; + skip_length = (png_uint_32)save_size; png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size); - png_ptr->skip_length -= save_size; + png_ptr->skip_length -= skip_length; png_ptr->buffer_size -= save_size; png_ptr->current_buffer_size -= save_size; png_ptr->current_buffer_ptr += save_size; @@ -625,7 +612,7 @@ png_push_crc_finish(png_structp png_ptr) } } -void PNGAPI +void PNGCBAPI png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length) { png_bytep ptr; @@ -640,10 +627,11 @@ png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length) if (length < png_ptr->save_buffer_size) save_size = length; + else save_size = png_ptr->save_buffer_size; - png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size); + memcpy(ptr, png_ptr->save_buffer_ptr, save_size); length -= save_size; ptr += save_size; png_ptr->buffer_size -= save_size; @@ -660,7 +648,7 @@ png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length) else save_size = png_ptr->current_buffer_size; - png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size); + memcpy(ptr, png_ptr->current_buffer_ptr, save_size); png_ptr->buffer_size -= save_size; png_ptr->current_buffer_size -= save_size; png_ptr->current_buffer_ptr += save_size; @@ -668,7 +656,7 @@ png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length) } void /* PRIVATE */ -png_push_save_buffer(png_structp png_ptr) +png_push_save_buffer(png_structrp png_ptr) { if (png_ptr->save_buffer_size) { @@ -680,40 +668,42 @@ png_push_save_buffer(png_structp png_ptr) istop = png_ptr->save_buffer_size; for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer; - i < istop; i++, sp++, dp++) + i < istop; i++, sp++, dp++) { *dp = *sp; } } } if (png_ptr->save_buffer_size + png_ptr->current_buffer_size > - png_ptr->save_buffer_max) + png_ptr->save_buffer_max) { png_size_t new_max; png_bytep old_buffer; if (png_ptr->save_buffer_size > PNG_SIZE_MAX - - (png_ptr->current_buffer_size + 256)) + (png_ptr->current_buffer_size + 256)) { - png_error(png_ptr, "Potential overflow of save_buffer"); + png_error(png_ptr, "Potential overflow of save_buffer"); } new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256; old_buffer = png_ptr->save_buffer; png_ptr->save_buffer = (png_bytep)png_malloc_warn(png_ptr, - (png_size_t)new_max); + (png_size_t)new_max); + if (png_ptr->save_buffer == NULL) { - png_free(png_ptr, old_buffer); - png_error(png_ptr, "Insufficient memory for save_buffer"); + png_free(png_ptr, old_buffer); + png_error(png_ptr, "Insufficient memory for save_buffer"); } - png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size); + + memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size); png_free(png_ptr, old_buffer); png_ptr->save_buffer_max = new_max; } if (png_ptr->current_buffer_size) { - png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size, + memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size, png_ptr->current_buffer_ptr, png_ptr->current_buffer_size); png_ptr->save_buffer_size += png_ptr->current_buffer_size; png_ptr->current_buffer_size = 0; @@ -723,7 +713,7 @@ png_push_save_buffer(png_structp png_ptr) } void /* PRIVATE */ -png_push_restore_buffer(png_structp png_ptr, png_bytep buffer, +png_push_restore_buffer(png_structrp png_ptr, png_bytep buffer, png_size_t buffer_length) { png_ptr->current_buffer = buffer; @@ -733,13 +723,14 @@ png_push_restore_buffer(png_structp png_ptr, png_bytep buffer, } void /* PRIVATE */ -png_push_read_IDAT(png_structp png_ptr) +png_push_read_IDAT(png_structrp png_ptr) { - PNG_IDAT; if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER)) { png_byte chunk_length[4]; + png_byte chunk_tag[4]; + /* TODO: this code can be commoned up with the same code in push_read */ if (png_ptr->buffer_size < 8) { png_push_save_buffer(png_ptr); @@ -749,63 +740,71 @@ png_push_read_IDAT(png_structp png_ptr) png_push_fill_buffer(png_ptr, chunk_length, 4); png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length); png_reset_crc(png_ptr); - png_crc_read(png_ptr, png_ptr->chunk_name, 4); + png_crc_read(png_ptr, chunk_tag, 4); + png_ptr->chunk_name = PNG_CHUNK_FROM_STRING(chunk_tag); png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; - if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + if (png_ptr->chunk_name != png_IDAT) { png_ptr->process_mode = PNG_READ_CHUNK_MODE; - if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) + + if (!(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED)) png_error(png_ptr, "Not enough compressed data"); + return; } png_ptr->idat_size = png_ptr->push_length; } + if (png_ptr->idat_size && png_ptr->save_buffer_size) { - png_size_t save_size; + png_size_t save_size = png_ptr->save_buffer_size; + png_uint_32 idat_size = png_ptr->idat_size; - if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size) - { - save_size = (png_size_t)png_ptr->idat_size; + /* We want the smaller of 'idat_size' and 'current_buffer_size', but they + * are of different types and we don't know which variable has the fewest + * bits. Carefully select the smaller and cast it to the type of the + * larger - this cannot overflow. Do not cast in the following test - it + * will break on either 16 or 64 bit platforms. + */ + if (idat_size < save_size) + save_size = (png_size_t)idat_size; - /* Check for overflow */ - if ((png_uint_32)save_size != png_ptr->idat_size) - png_error(png_ptr, "save_size overflowed in pngpread"); - } else - save_size = png_ptr->save_buffer_size; + idat_size = (png_uint_32)save_size; png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size); png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size); - png_ptr->idat_size -= save_size; + png_ptr->idat_size -= idat_size; png_ptr->buffer_size -= save_size; png_ptr->save_buffer_size -= save_size; png_ptr->save_buffer_ptr += save_size; } + if (png_ptr->idat_size && png_ptr->current_buffer_size) { - png_size_t save_size; + png_size_t save_size = png_ptr->current_buffer_size; + png_uint_32 idat_size = png_ptr->idat_size; - if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size) - { - save_size = (png_size_t)png_ptr->idat_size; + /* We want the smaller of 'idat_size' and 'current_buffer_size', but they + * are of different types and we don't know which variable has the fewest + * bits. Carefully select the smaller and cast it to the type of the + * larger - this cannot overflow. + */ + if (idat_size < save_size) + save_size = (png_size_t)idat_size; - /* Check for overflow */ - if ((png_uint_32)save_size != png_ptr->idat_size) - png_error(png_ptr, "save_size overflowed in pngpread"); - } else - save_size = png_ptr->current_buffer_size; + idat_size = (png_uint_32)save_size; png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size); png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size); - png_ptr->idat_size -= save_size; + png_ptr->idat_size -= idat_size; png_ptr->buffer_size -= save_size; png_ptr->current_buffer_size -= save_size; png_ptr->current_buffer_ptr += save_size; @@ -821,11 +820,12 @@ png_push_read_IDAT(png_structp png_ptr) png_crc_finish(png_ptr, 0); png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; png_ptr->mode |= PNG_AFTER_IDAT; + png_ptr->zowner = 0; } } void /* PRIVATE */ -png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, +png_process_IDAT_data(png_structrp png_ptr, png_bytep buffer, png_size_t buffer_length) { /* The caller checks for a non-zero buffer length. */ @@ -837,35 +837,37 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, * handle the uncompressed results. */ png_ptr->zstream.next_in = buffer; + /* TODO: WARNING: TRUNCATION ERROR: DANGER WILL ROBINSON: */ png_ptr->zstream.avail_in = (uInt)buffer_length; /* Keep going until the decompressed data is all processed * or the stream marked as finished. */ while (png_ptr->zstream.avail_in > 0 && - !(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) + !(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED)) { int ret; /* We have data for zlib, but we must check that zlib - * has somewhere to put the results. It doesn't matter + * has someplace to put the results. It doesn't matter * if we don't expect any results -- it may be the input * data is just the LZ end code. */ if (!(png_ptr->zstream.avail_out > 0)) { - png_ptr->zstream.avail_out = - (uInt) PNG_ROWBYTES(png_ptr->pixel_depth, - png_ptr->iwidth) + 1; + /* TODO: WARNING: TRUNCATION ERROR: DANGER WILL ROBINSON: */ + png_ptr->zstream.avail_out = (uInt)(PNG_ROWBYTES(png_ptr->pixel_depth, + png_ptr->iwidth) + 1); + png_ptr->zstream.next_out = png_ptr->row_buf; } /* Using Z_SYNC_FLUSH here means that an unterminated - * LZ stream can still be handled (a stream with a missing - * end code), otherwise (Z_NO_FLUSH) a future zlib - * implementation might defer output and, therefore, - * change the current behavior. (See comments in inflate.c - * for why this doesn't happen at present with zlib 1.2.5.) + * LZ stream (a stream with a missing end code) can still + * be handled, otherwise (Z_NO_FLUSH) a future zlib + * implementation might defer output and therefore + * change the current behavior (see comments in inflate.c + * for why this doesn't happen at present with zlib 1.2.5). */ ret = inflate(&png_ptr->zstream, Z_SYNC_FLUSH); @@ -873,7 +875,8 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, if (ret != Z_OK && ret != Z_STREAM_END) { /* Terminate the decompression. */ - png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; + png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED; + png_ptr->zowner = 0; /* This may be a truncated stream (missing or * damaged end code). Treat that as a warning. @@ -881,6 +884,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, if (png_ptr->row_number >= png_ptr->num_rows || png_ptr->pass > 6) png_warning(png_ptr, "Truncated compressed data in IDAT"); + else png_error(png_ptr, "Decompression error in IDAT"); @@ -900,7 +904,9 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, { /* Extra data. */ png_warning(png_ptr, "Extra compressed data in IDAT"); - png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; + png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED; + png_ptr->zowner = 0; + /* Do no more processing; skip the unprocessed * input check below. */ @@ -914,7 +920,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, /* And check for the end of the stream. */ if (ret == Z_STREAM_END) - png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; + png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED; } /* All the data should have been processed, if anything @@ -922,40 +928,62 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, * after the zlib end code. */ if (png_ptr->zstream.avail_in > 0) - png_warning(png_ptr, "Extra compression data"); + png_warning(png_ptr, "Extra compression data in IDAT"); } void /* PRIVATE */ -png_push_process_row(png_structp png_ptr) +png_push_process_row(png_structrp png_ptr) { - png_ptr->row_info.color_type = png_ptr->color_type; - png_ptr->row_info.width = png_ptr->iwidth; - png_ptr->row_info.channels = png_ptr->channels; - png_ptr->row_info.bit_depth = png_ptr->bit_depth; - png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; + /* 1.5.6: row_info moved out of png_struct to a local here. */ + png_row_info row_info; - png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, - png_ptr->row_info.width); + row_info.width = png_ptr->iwidth; /* NOTE: width of current interlaced row */ + row_info.color_type = png_ptr->color_type; + row_info.bit_depth = png_ptr->bit_depth; + row_info.channels = png_ptr->channels; + row_info.pixel_depth = png_ptr->pixel_depth; + row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width); - png_read_filter_row(png_ptr, &(png_ptr->row_info), - png_ptr->row_buf + 1, png_ptr->prev_row + 1, - (int)(png_ptr->row_buf[0])); + if (png_ptr->row_buf[0] > PNG_FILTER_VALUE_NONE) + { + if (png_ptr->row_buf[0] < PNG_FILTER_VALUE_LAST) + png_read_filter_row(png_ptr, &row_info, png_ptr->row_buf + 1, + png_ptr->prev_row + 1, png_ptr->row_buf[0]); + else + png_error(png_ptr, "bad adaptive filter value"); + } - png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1); + /* libpng 1.5.6: the following line was copying png_ptr->rowbytes before + * 1.5.6, while the buffer really is this big in current versions of libpng + * it may not be in the future, so this was changed just to copy the + * interlaced row count: + */ + memcpy(png_ptr->prev_row, png_ptr->row_buf, row_info.rowbytes + 1); + +#ifdef PNG_READ_TRANSFORMS_SUPPORTED + if (png_ptr->transformations) + png_do_read_transformations(png_ptr, &row_info); +#endif + + /* The transformed pixel depth should match the depth now in row_info. */ + if (png_ptr->transformed_pixel_depth == 0) + { + png_ptr->transformed_pixel_depth = row_info.pixel_depth; + if (row_info.pixel_depth > png_ptr->maximum_pixel_depth) + png_error(png_ptr, "progressive row overflow"); + } + + else if (png_ptr->transformed_pixel_depth != row_info.pixel_depth) + png_error(png_ptr, "internal progressive row size calculation error"); - if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) - png_do_read_transformations(png_ptr); #ifdef PNG_READ_INTERLACING_SUPPORTED /* Blow up interlaced rows to full size */ if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) { if (png_ptr->pass < 6) -/* old interface (pre-1.0.9): - png_do_read_interlace(&(png_ptr->row_info), - png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); - */ - png_do_read_interlace(png_ptr); + png_do_read_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass, + png_ptr->transformations); switch (png_ptr->pass) { @@ -1133,26 +1161,28 @@ png_push_process_row(png_structp png_ptr) } void /* PRIVATE */ -png_read_push_finish_row(png_structp png_ptr) +png_read_push_finish_row(png_structrp png_ptr) { +#ifdef PNG_READ_INTERLACING_SUPPORTED /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* Start of interlace block */ - PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; + static PNG_CONST png_byte png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; /* Offset to next interlace block */ - PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; + static PNG_CONST png_byte png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; /* Start of interlace block in the y direction */ - PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; + static PNG_CONST png_byte png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; /* Offset to next interlace block in the y direction */ - PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; + static PNG_CONST png_byte png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; /* Height of interlace block. This is not currently used - if you need * it, uncomment it here and in png.h - PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; + static PNG_CONST png_byte png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; */ +#endif png_ptr->row_number++; if (png_ptr->row_number < png_ptr->num_rows) @@ -1162,15 +1192,15 @@ png_read_push_finish_row(png_structp png_ptr) if (png_ptr->interlaced) { png_ptr->row_number = 0; - png_memset(png_ptr->prev_row, 0, - png_ptr->rowbytes + 1); + memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); + do { png_ptr->pass++; if ((png_ptr->pass == 1 && png_ptr->width < 5) || (png_ptr->pass == 3 && png_ptr->width < 3) || (png_ptr->pass == 5 && png_ptr->width < 2)) - png_ptr->pass++; + png_ptr->pass++; if (png_ptr->pass > 7) png_ptr->pass--; @@ -1179,572 +1209,66 @@ png_read_push_finish_row(png_structp png_ptr) break; png_ptr->iwidth = (png_ptr->width + - png_pass_inc[png_ptr->pass] - 1 - - png_pass_start[png_ptr->pass]) / - png_pass_inc[png_ptr->pass]; + png_pass_inc[png_ptr->pass] - 1 - + png_pass_start[png_ptr->pass]) / + png_pass_inc[png_ptr->pass]; if (png_ptr->transformations & PNG_INTERLACE) break; png_ptr->num_rows = (png_ptr->height + - png_pass_yinc[png_ptr->pass] - 1 - - png_pass_ystart[png_ptr->pass]) / - png_pass_yinc[png_ptr->pass]; + png_pass_yinc[png_ptr->pass] - 1 - + png_pass_ystart[png_ptr->pass]) / + png_pass_yinc[png_ptr->pass]; } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0); } #endif /* PNG_READ_INTERLACING_SUPPORTED */ } -#ifdef PNG_READ_tEXt_SUPPORTED void /* PRIVATE */ -png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 - length) -{ - if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) - { - png_error(png_ptr, "Out of place tEXt"); - info_ptr = info_ptr; /* To quiet some compiler warnings */ - } - -#ifdef PNG_MAX_MALLOC_64K - png_ptr->skip_length = 0; /* This may not be necessary */ - - if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */ - { - png_warning(png_ptr, "tEXt chunk too large to fit in memory"); - png_ptr->skip_length = length - (png_uint_32)65535L; - length = (png_uint_32)65535L; - } -#endif - - png_ptr->current_text = (png_charp)png_malloc(png_ptr, - (png_size_t)(length + 1)); - png_ptr->current_text[length] = '\0'; - png_ptr->current_text_ptr = png_ptr->current_text; - png_ptr->current_text_size = (png_size_t)length; - png_ptr->current_text_left = (png_size_t)length; - png_ptr->process_mode = PNG_READ_tEXt_MODE; -} - -void /* PRIVATE */ -png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr) -{ - if (png_ptr->buffer_size && png_ptr->current_text_left) - { - png_size_t text_size; - - if (png_ptr->buffer_size < png_ptr->current_text_left) - text_size = png_ptr->buffer_size; - - else - text_size = png_ptr->current_text_left; - - png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); - png_ptr->current_text_left -= text_size; - png_ptr->current_text_ptr += text_size; - } - if (!(png_ptr->current_text_left)) - { - png_textp text_ptr; - png_charp text; - png_charp key; - int ret; - - if (png_ptr->buffer_size < 4) - { - png_push_save_buffer(png_ptr); - return; - } - - png_push_crc_finish(png_ptr); - -#ifdef PNG_MAX_MALLOC_64K - if (png_ptr->skip_length) - return; -#endif - - key = png_ptr->current_text; - - for (text = key; *text; text++) - /* Empty loop */ ; - - if (text < key + png_ptr->current_text_size) - text++; - - text_ptr = (png_textp)png_malloc(png_ptr, - png_sizeof(png_text)); - text_ptr->compression = PNG_TEXT_COMPRESSION_NONE; - text_ptr->key = key; -#ifdef PNG_iTXt_SUPPORTED - text_ptr->lang = NULL; - text_ptr->lang_key = NULL; -#endif - text_ptr->text = text; - - ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); - - png_free(png_ptr, key); - png_free(png_ptr, text_ptr); - png_ptr->current_text = NULL; - - if (ret) - png_warning(png_ptr, "Insufficient memory to store text chunk"); - } -} -#endif - -#ifdef PNG_READ_zTXt_SUPPORTED -void /* PRIVATE */ -png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 - length) -{ - if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) - { - png_error(png_ptr, "Out of place zTXt"); - info_ptr = info_ptr; /* To quiet some compiler warnings */ - } - -#ifdef PNG_MAX_MALLOC_64K - /* We can't handle zTXt chunks > 64K, since we don't have enough space - * to be able to store the uncompressed data. Actually, the threshold - * is probably around 32K, but it isn't as definite as 64K is. - */ - if (length > (png_uint_32)65535L) - { - png_warning(png_ptr, "zTXt chunk too large to fit in memory"); - png_push_crc_skip(png_ptr, length); - return; - } -#endif - - png_ptr->current_text = (png_charp)png_malloc(png_ptr, - (png_size_t)(length + 1)); - png_ptr->current_text[length] = '\0'; - png_ptr->current_text_ptr = png_ptr->current_text; - png_ptr->current_text_size = (png_size_t)length; - png_ptr->current_text_left = (png_size_t)length; - png_ptr->process_mode = PNG_READ_zTXt_MODE; -} - -void /* PRIVATE */ -png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr) -{ - if (png_ptr->buffer_size && png_ptr->current_text_left) - { - png_size_t text_size; - - if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left) - text_size = png_ptr->buffer_size; - - else - text_size = png_ptr->current_text_left; - - png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); - png_ptr->current_text_left -= text_size; - png_ptr->current_text_ptr += text_size; - } - if (!(png_ptr->current_text_left)) - { - png_textp text_ptr; - png_charp text; - png_charp key; - int ret; - png_size_t text_size, key_size; - - if (png_ptr->buffer_size < 4) - { - png_push_save_buffer(png_ptr); - return; - } - - png_push_crc_finish(png_ptr); - - key = png_ptr->current_text; - - for (text = key; *text; text++) - /* Empty loop */ ; - - /* zTXt can't have zero text */ - if (text >= key + png_ptr->current_text_size) - { - png_ptr->current_text = NULL; - png_free(png_ptr, key); - return; - } - - text++; - - if (*text != PNG_TEXT_COMPRESSION_zTXt) /* Check compression byte */ - { - png_ptr->current_text = NULL; - png_free(png_ptr, key); - return; - } - - text++; - - png_ptr->zstream.next_in = (png_bytep )text; - png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size - - (text - key)); - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - - key_size = text - key; - text_size = 0; - text = NULL; - ret = Z_STREAM_END; - - while (png_ptr->zstream.avail_in) - { - ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); - if (ret != Z_OK && ret != Z_STREAM_END) - { - inflateReset(&png_ptr->zstream); - png_ptr->zstream.avail_in = 0; - png_ptr->current_text = NULL; - png_free(png_ptr, key); - png_free(png_ptr, text); - return; - } - if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END) - { - if (text == NULL) - { - text = (png_charp)png_malloc(png_ptr, - (png_ptr->zbuf_size - - png_ptr->zstream.avail_out + key_size + 1)); - - png_memcpy(text + key_size, png_ptr->zbuf, - png_ptr->zbuf_size - png_ptr->zstream.avail_out); - - png_memcpy(text, key, key_size); - - text_size = key_size + png_ptr->zbuf_size - - png_ptr->zstream.avail_out; - - *(text + text_size) = '\0'; - } - else - { - png_charp tmp; - - tmp = text; - text = (png_charp)png_malloc(png_ptr, text_size + - (png_ptr->zbuf_size - - png_ptr->zstream.avail_out + 1)); - - png_memcpy(text, tmp, text_size); - png_free(png_ptr, tmp); - - png_memcpy(text + text_size, png_ptr->zbuf, - png_ptr->zbuf_size - png_ptr->zstream.avail_out); - - text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out; - *(text + text_size) = '\0'; - } - if (ret != Z_STREAM_END) - { - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - } - } - else - { - break; - } - - if (ret == Z_STREAM_END) - break; - } - - inflateReset(&png_ptr->zstream); - png_ptr->zstream.avail_in = 0; - - if (ret != Z_STREAM_END) - { - png_ptr->current_text = NULL; - png_free(png_ptr, key); - png_free(png_ptr, text); - return; - } - - png_ptr->current_text = NULL; - png_free(png_ptr, key); - key = text; - text += key_size; - - text_ptr = (png_textp)png_malloc(png_ptr, - png_sizeof(png_text)); - text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt; - text_ptr->key = key; -#ifdef PNG_iTXt_SUPPORTED - text_ptr->lang = NULL; - text_ptr->lang_key = NULL; -#endif - text_ptr->text = text; - - ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); - - png_free(png_ptr, key); - png_free(png_ptr, text_ptr); - - if (ret) - png_warning(png_ptr, "Insufficient memory to store text chunk"); - } -} -#endif - -#ifdef PNG_READ_iTXt_SUPPORTED -void /* PRIVATE */ -png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 - length) -{ - if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) - { - png_error(png_ptr, "Out of place iTXt"); - info_ptr = info_ptr; /* To quiet some compiler warnings */ - } - -#ifdef PNG_MAX_MALLOC_64K - png_ptr->skip_length = 0; /* This may not be necessary */ - - if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */ - { - png_warning(png_ptr, "iTXt chunk too large to fit in memory"); - png_ptr->skip_length = length - (png_uint_32)65535L; - length = (png_uint_32)65535L; - } -#endif - - png_ptr->current_text = (png_charp)png_malloc(png_ptr, - (png_size_t)(length + 1)); - png_ptr->current_text[length] = '\0'; - png_ptr->current_text_ptr = png_ptr->current_text; - png_ptr->current_text_size = (png_size_t)length; - png_ptr->current_text_left = (png_size_t)length; - png_ptr->process_mode = PNG_READ_iTXt_MODE; -} - -void /* PRIVATE */ -png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr) -{ - - if (png_ptr->buffer_size && png_ptr->current_text_left) - { - png_size_t text_size; - - if (png_ptr->buffer_size < png_ptr->current_text_left) - text_size = png_ptr->buffer_size; - - else - text_size = png_ptr->current_text_left; - - png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); - png_ptr->current_text_left -= text_size; - png_ptr->current_text_ptr += text_size; - } - if (!(png_ptr->current_text_left)) - { - png_textp text_ptr; - png_charp key; - int comp_flag; - png_charp lang; - png_charp lang_key; - png_charp text; - int ret; - - if (png_ptr->buffer_size < 4) - { - png_push_save_buffer(png_ptr); - return; - } - - png_push_crc_finish(png_ptr); - -#ifdef PNG_MAX_MALLOC_64K - if (png_ptr->skip_length) - return; -#endif - - key = png_ptr->current_text; - - for (lang = key; *lang; lang++) - /* Empty loop */ ; - - if (lang < key + png_ptr->current_text_size - 3) - lang++; - - comp_flag = *lang++; - lang++; /* Skip comp_type, always zero */ - - for (lang_key = lang; *lang_key; lang_key++) - /* Empty loop */ ; - - lang_key++; /* Skip NUL separator */ - - text=lang_key; - - if (lang_key < key + png_ptr->current_text_size - 1) - { - for (; *text; text++) - /* Empty loop */ ; - } - - if (text < key + png_ptr->current_text_size) - text++; - - text_ptr = (png_textp)png_malloc(png_ptr, - png_sizeof(png_text)); - - text_ptr->compression = comp_flag + 2; - text_ptr->key = key; - text_ptr->lang = lang; - text_ptr->lang_key = lang_key; - text_ptr->text = text; - text_ptr->text_length = 0; - text_ptr->itxt_length = png_strlen(text); - - ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); - - png_ptr->current_text = NULL; - - png_free(png_ptr, text_ptr); - if (ret) - png_warning(png_ptr, "Insufficient memory to store iTXt chunk"); - } -} -#endif - -/* This function is called when we haven't found a handler for this - * chunk. If there isn't a problem with the chunk itself (ie a bad chunk - * name or a critical chunk), the chunk is (currently) silently ignored. - */ -void /* PRIVATE */ -png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 - length) -{ - png_uint_32 skip = 0; - - if (!(png_ptr->chunk_name[0] & 0x20)) - { -#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED - if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != - PNG_HANDLE_CHUNK_ALWAYS -#ifdef PNG_READ_USER_CHUNKS_SUPPORTED - && png_ptr->read_user_chunk_fn == NULL -#endif - ) -#endif - png_chunk_error(png_ptr, "unknown critical chunk"); - - info_ptr = info_ptr; /* To quiet some compiler warnings */ - } - -#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED - if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) - { -#ifdef PNG_MAX_MALLOC_64K - if (length > (png_uint_32)65535L) - { - png_warning(png_ptr, "unknown chunk too large to fit in memory"); - skip = length - (png_uint_32)65535L; - length = (png_uint_32)65535L; - } -#endif - png_memcpy((png_charp)png_ptr->unknown_chunk.name, - (png_charp)png_ptr->chunk_name, - png_sizeof(png_ptr->unknown_chunk.name)); - png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name) - 1] - = '\0'; - - png_ptr->unknown_chunk.size = (png_size_t)length; - - if (length == 0) - png_ptr->unknown_chunk.data = NULL; - - else - { - png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, - (png_size_t)length); - png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length); - } - -#ifdef PNG_READ_USER_CHUNKS_SUPPORTED - if (png_ptr->read_user_chunk_fn != NULL) - { - /* Callback to user unknown chunk handler */ - int ret; - ret = (*(png_ptr->read_user_chunk_fn)) - (png_ptr, &png_ptr->unknown_chunk); - - if (ret < 0) - png_chunk_error(png_ptr, "error in user chunk"); - - if (ret == 0) - { - if (!(png_ptr->chunk_name[0] & 0x20)) - if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != - PNG_HANDLE_CHUNK_ALWAYS) - png_chunk_error(png_ptr, "unknown critical chunk"); - png_set_unknown_chunks(png_ptr, info_ptr, - &png_ptr->unknown_chunk, 1); - } - } - - else -#endif - png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1); - png_free(png_ptr, png_ptr->unknown_chunk.data); - png_ptr->unknown_chunk.data = NULL; - } - - else -#endif - skip=length; - png_push_crc_skip(png_ptr, skip); -} - -void /* PRIVATE */ -png_push_have_info(png_structp png_ptr, png_infop info_ptr) +png_push_have_info(png_structrp png_ptr, png_inforp info_ptr) { if (png_ptr->info_fn != NULL) (*(png_ptr->info_fn))(png_ptr, info_ptr); } void /* PRIVATE */ -png_push_have_end(png_structp png_ptr, png_infop info_ptr) +png_push_have_end(png_structrp png_ptr, png_inforp info_ptr) { if (png_ptr->end_fn != NULL) (*(png_ptr->end_fn))(png_ptr, info_ptr); } void /* PRIVATE */ -png_push_have_row(png_structp png_ptr, png_bytep row) +png_push_have_row(png_structrp png_ptr, png_bytep row) { if (png_ptr->row_fn != NULL) (*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number, (int)png_ptr->pass); } +#ifdef PNG_READ_INTERLACING_SUPPORTED void PNGAPI -png_progressive_combine_row(png_structp png_ptr, - png_bytep old_row, png_bytep new_row) +png_progressive_combine_row(png_const_structrp png_ptr, png_bytep old_row, + png_const_bytep new_row) { - PNG_CONST int FARDATA png_pass_dsp_mask[7] = - {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; - if (png_ptr == NULL) return; - if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */ - png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]); + /* new_row is a flag here - if it is NULL then the app callback was called + * from an empty row (see the calls to png_struct::row_fn below), otherwise + * it must be png_ptr->row_buf+1 + */ + if (new_row != NULL) + png_combine_row(png_ptr, old_row, 1/*display*/); } +#endif /* PNG_READ_INTERLACING_SUPPORTED */ void PNGAPI -png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr, - png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, - png_progressive_end_ptr end_fn) +png_set_progressive_read_fn(png_structrp png_ptr, png_voidp progressive_ptr, + png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, + png_progressive_end_ptr end_fn) { if (png_ptr == NULL) return; @@ -1757,7 +1281,7 @@ png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr, } png_voidp PNGAPI -png_get_progressive_ptr(png_const_structp png_ptr) +png_get_progressive_ptr(png_const_structrp png_ptr) { if (png_ptr == NULL) return (NULL); diff --git a/project/jni/png/pngread.c b/project/jni/png/pngread.c index b2c73914e..8f96ca23e 100644 --- a/project/jni/png/pngread.c +++ b/project/jni/png/pngread.c @@ -1,8 +1,8 @@ /* pngread.c - read a PNG file * - * Last changed in libpng 1.4.6 [January 14, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.1 [March 28, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -14,190 +14,68 @@ * read a PNG file or stream. */ -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" -#ifdef PNG_READ_SUPPORTED #include "pngpriv.h" +#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) && defined(PNG_STDIO_SUPPORTED) +# include +#endif +#ifdef PNG_READ_SUPPORTED /* Create a PNG structure for reading, and allocate any memory needed. */ -png_structp PNGAPI -png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr, - png_error_ptr error_fn, png_error_ptr warn_fn) +PNG_FUNCTION(png_structp,PNGAPI +png_create_read_struct,(png_const_charp user_png_ver, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED) { - -#ifdef PNG_USER_MEM_SUPPORTED - return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn, - warn_fn, NULL, NULL, NULL)); +#ifndef PNG_USER_MEM_SUPPORTED + png_structp png_ptr = png_create_png_struct(user_png_ver, error_ptr, + error_fn, warn_fn, NULL, NULL, NULL); +#else + return png_create_read_struct_2(user_png_ver, error_ptr, error_fn, + warn_fn, NULL, NULL, NULL); } /* Alternate create PNG structure for reading, and allocate any memory * needed. */ -png_structp PNGAPI -png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, - png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, - png_malloc_ptr malloc_fn, png_free_ptr free_fn) +PNG_FUNCTION(png_structp,PNGAPI +png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, + png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED) { + png_structp png_ptr = png_create_png_struct(user_png_ver, error_ptr, + error_fn, warn_fn, mem_ptr, malloc_fn, free_fn); #endif /* PNG_USER_MEM_SUPPORTED */ -#ifdef PNG_SETJMP_SUPPORTED - volatile -#endif - png_structp png_ptr; - volatile int png_cleanup_needed = 0; - -#ifdef PNG_SETJMP_SUPPORTED -#ifdef USE_FAR_KEYWORD - jmp_buf jmpbuf; -#endif -#endif - - int i; - - png_debug(1, "in png_create_read_struct"); - -#ifdef PNG_USER_MEM_SUPPORTED - png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, - malloc_fn, mem_ptr); -#else - png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); -#endif - if (png_ptr == NULL) - return (NULL); - - /* Added at libpng-1.2.6 */ -#ifdef PNG_USER_LIMITS_SUPPORTED - png_ptr->user_width_max = PNG_USER_WIDTH_MAX; - png_ptr->user_height_max = PNG_USER_HEIGHT_MAX; -# ifdef PNG_USER_CHUNK_CACHE_MAX - /* Added at libpng-1.2.43 and 1.4.0 */ - png_ptr->user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX; -# endif -# ifdef PNG_SET_USER_CHUNK_MALLOC_MAX - /* Added at libpng-1.2.43 and 1.4.1 */ - png_ptr->user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX; -# endif -#endif - -#ifdef PNG_SETJMP_SUPPORTED -/* Applications that neglect to set up their own setjmp() and then - encounter a png_error() will longjmp here. Since the jmpbuf is - then meaningless we abort instead of returning. */ -#ifdef USE_FAR_KEYWORD - if (setjmp(jmpbuf)) -#else - if (setjmp(png_jmpbuf(png_ptr))) /* Sets longjmp to match setjmp */ -#endif - PNG_ABORT(); -#ifdef USE_FAR_KEYWORD - png_memcpy(png_jmpbuf(png_ptr), jmpbuf, png_sizeof(jmp_buf)); -#endif -#endif /* PNG_SETJMP_SUPPORTED */ - -#ifdef PNG_USER_MEM_SUPPORTED - png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); -#endif - - png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); - - if (user_png_ver) + if (png_ptr != NULL) { - i = 0; - do - { - if (user_png_ver[i] != png_libpng_ver[i]) - png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; - } while (png_libpng_ver[i++]); - } - else - png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; + png_ptr->mode = PNG_IS_READ_STRUCT; - - if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) - { - /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so - * we must recompile any applications that use any older library version. - * For versions after libpng 1.0, we will be compatible, so we need - * only check the first digit. + /* Added in libpng-1.6.0; this can be used to detect a read structure if + * required (it will be zero in a write structure.) */ - if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || - (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || - (user_png_ver[0] == '0' && user_png_ver[2] < '9')) - { -#ifdef PNG_STDIO_SUPPORTED - char msg[80]; - if (user_png_ver) - { - png_snprintf(msg, 80, - "Application was compiled with png.h from libpng-%.20s", - user_png_ver); - png_warning(png_ptr, msg); - } - png_snprintf(msg, 80, - "Application is running with png.c from libpng-%.20s", - png_libpng_ver); - png_warning(png_ptr, msg); -#endif -#ifdef PNG_ERROR_NUMBERS_SUPPORTED - png_ptr->flags = 0; -#endif - png_warning(png_ptr, - "Incompatible libpng version in application and library"); +# ifdef PNG_SEQUENTIAL_READ_SUPPORTED + png_ptr->IDAT_read_size = PNG_IDAT_READ_SIZE; +# endif - png_cleanup_needed = 1; - } +# ifdef PNG_BENIGN_READ_ERRORS_SUPPORTED + png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN; + + /* In stable builds only warn if an application error can be completely + * handled. + */ +# if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC + png_ptr->flags |= PNG_FLAG_APP_WARNINGS_WARN; +# endif +# endif + + /* TODO: delay this, it can be done in png_init_io (if the app doesn't + * do it itself) avoiding setting the default function if it is not + * required. + */ + png_set_read_fn(png_ptr, NULL, NULL); } - if (!png_cleanup_needed) - { - /* Initialize zbuf - compression buffer */ - png_ptr->zbuf_size = PNG_ZBUF_SIZE; - png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr, - png_ptr->zbuf_size); - if (png_ptr->zbuf == NULL) - png_cleanup_needed = 1; - } - png_ptr->zstream.zalloc = png_zalloc; - png_ptr->zstream.zfree = png_zfree; - png_ptr->zstream.opaque = (voidpf)png_ptr; - - if (!png_cleanup_needed) - { - switch (inflateInit(&png_ptr->zstream)) - { - case Z_OK: /* Do nothing */ break; - case Z_MEM_ERROR: - case Z_STREAM_ERROR: png_warning(png_ptr, "zlib memory error"); - png_cleanup_needed = 1; break; - case Z_VERSION_ERROR: png_warning(png_ptr, "zlib version error"); - png_cleanup_needed = 1; break; - default: png_warning(png_ptr, "Unknown zlib error"); - png_cleanup_needed = 1; - } - } - - if (png_cleanup_needed) - { - /* Clean up PNG structure and deallocate any memory. */ - png_free(png_ptr, png_ptr->zbuf); - png_ptr->zbuf = NULL; -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)png_ptr, - (png_free_ptr)free_fn, (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)png_ptr); -#endif - return (NULL); - } - - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - - png_set_read_fn(png_ptr, NULL, NULL); - - - return (png_ptr); + return png_ptr; } @@ -211,8 +89,12 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, * read if it is determined that this isn't a valid PNG file. */ void PNGAPI -png_read_info(png_structp png_ptr, png_infop info_ptr) +png_read_info(png_structrp png_ptr, png_inforp info_ptr) { +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + int keep; +#endif + png_debug(1, "in png_read_info"); if (png_ptr == NULL || info_ptr == NULL) @@ -223,197 +105,179 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) for (;;) { - PNG_IHDR; - PNG_IDAT; - PNG_IEND; - PNG_PLTE; -#ifdef PNG_READ_bKGD_SUPPORTED - PNG_bKGD; -#endif -#ifdef PNG_READ_cHRM_SUPPORTED - PNG_cHRM; -#endif -#ifdef PNG_READ_gAMA_SUPPORTED - PNG_gAMA; -#endif -#ifdef PNG_READ_hIST_SUPPORTED - PNG_hIST; -#endif -#ifdef PNG_READ_iCCP_SUPPORTED - PNG_iCCP; -#endif -#ifdef PNG_READ_iTXt_SUPPORTED - PNG_iTXt; -#endif -#ifdef PNG_READ_oFFs_SUPPORTED - PNG_oFFs; -#endif -#ifdef PNG_READ_pCAL_SUPPORTED - PNG_pCAL; -#endif -#ifdef PNG_READ_pHYs_SUPPORTED - PNG_pHYs; -#endif -#ifdef PNG_READ_sBIT_SUPPORTED - PNG_sBIT; -#endif -#ifdef PNG_READ_sCAL_SUPPORTED - PNG_sCAL; -#endif -#ifdef PNG_READ_sPLT_SUPPORTED - PNG_sPLT; -#endif -#ifdef PNG_READ_sRGB_SUPPORTED - PNG_sRGB; -#endif -#ifdef PNG_READ_tEXt_SUPPORTED - PNG_tEXt; -#endif -#ifdef PNG_READ_tIME_SUPPORTED - PNG_tIME; -#endif -#ifdef PNG_READ_tRNS_SUPPORTED - PNG_tRNS; -#endif -#ifdef PNG_READ_zTXt_SUPPORTED - PNG_zTXt; -#endif png_uint_32 length = png_read_chunk_header(png_ptr); - PNG_CONST png_bytep chunk_name = png_ptr->chunk_name; + png_uint_32 chunk_name = png_ptr->chunk_name; + + /* IDAT logic needs to happen here to simplify getting the two flags + * right. + */ + if (chunk_name == png_IDAT) + { + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_chunk_error(png_ptr, "Missing IHDR before IDAT"); + + else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + !(png_ptr->mode & PNG_HAVE_PLTE)) + png_chunk_error(png_ptr, "Missing PLTE before IDAT"); + + else if (png_ptr->mode & PNG_AFTER_IDAT) + png_chunk_benign_error(png_ptr, "Too many IDATs found"); + + png_ptr->mode |= PNG_HAVE_IDAT; + } + + else if (png_ptr->mode & PNG_HAVE_IDAT) + png_ptr->mode |= PNG_AFTER_IDAT; /* This should be a binary subdivision search or a hash for * matching the chunk name rather than a linear search. */ - if (!png_memcmp(chunk_name, png_IDAT, 4)) - if (png_ptr->mode & PNG_AFTER_IDAT) - png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; - - if (!png_memcmp(chunk_name, png_IHDR, 4)) + if (chunk_name == png_IHDR) png_handle_IHDR(png_ptr, info_ptr, length); - else if (!png_memcmp(chunk_name, png_IEND, 4)) + + else if (chunk_name == png_IEND) png_handle_IEND(png_ptr, info_ptr, length); + #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - else if (png_handle_as_unknown(png_ptr, chunk_name)) + else if ((keep = png_chunk_unknown_handling(png_ptr, chunk_name)) != 0) { - if (!png_memcmp(chunk_name, png_IDAT, 4)) - png_ptr->mode |= PNG_HAVE_IDAT; - png_handle_unknown(png_ptr, info_ptr, length); - if (!png_memcmp(chunk_name, png_PLTE, 4)) + png_handle_unknown(png_ptr, info_ptr, length, keep); + + if (chunk_name == png_PLTE) png_ptr->mode |= PNG_HAVE_PLTE; - else if (!png_memcmp(chunk_name, png_IDAT, 4)) + + else if (chunk_name == png_IDAT) { - if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before IDAT"); - else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && - !(png_ptr->mode & PNG_HAVE_PLTE)) - png_error(png_ptr, "Missing PLTE before IDAT"); + png_ptr->idat_size = 0; /* It has been consumed */ break; } } #endif - else if (!png_memcmp(chunk_name, png_PLTE, 4)) + else if (chunk_name == png_PLTE) png_handle_PLTE(png_ptr, info_ptr, length); - else if (!png_memcmp(chunk_name, png_IDAT, 4)) - { - if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before IDAT"); - else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && - !(png_ptr->mode & PNG_HAVE_PLTE)) - png_error(png_ptr, "Missing PLTE before IDAT"); + else if (chunk_name == png_IDAT) + { png_ptr->idat_size = length; - png_ptr->mode |= PNG_HAVE_IDAT; break; } + #ifdef PNG_READ_bKGD_SUPPORTED - else if (!png_memcmp(chunk_name, png_bKGD, 4)) + else if (chunk_name == png_bKGD) png_handle_bKGD(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_cHRM_SUPPORTED - else if (!png_memcmp(chunk_name, png_cHRM, 4)) + else if (chunk_name == png_cHRM) png_handle_cHRM(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_gAMA_SUPPORTED - else if (!png_memcmp(chunk_name, png_gAMA, 4)) + else if (chunk_name == png_gAMA) png_handle_gAMA(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_hIST_SUPPORTED - else if (!png_memcmp(chunk_name, png_hIST, 4)) + else if (chunk_name == png_hIST) png_handle_hIST(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_oFFs_SUPPORTED - else if (!png_memcmp(chunk_name, png_oFFs, 4)) + else if (chunk_name == png_oFFs) png_handle_oFFs(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_pCAL_SUPPORTED - else if (!png_memcmp(chunk_name, png_pCAL, 4)) + else if (chunk_name == png_pCAL) png_handle_pCAL(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_sCAL_SUPPORTED - else if (!png_memcmp(chunk_name, png_sCAL, 4)) + else if (chunk_name == png_sCAL) png_handle_sCAL(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_pHYs_SUPPORTED - else if (!png_memcmp(chunk_name, png_pHYs, 4)) + else if (chunk_name == png_pHYs) png_handle_pHYs(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_sBIT_SUPPORTED - else if (!png_memcmp(chunk_name, png_sBIT, 4)) + else if (chunk_name == png_sBIT) png_handle_sBIT(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_sRGB_SUPPORTED - else if (!png_memcmp(chunk_name, png_sRGB, 4)) + else if (chunk_name == png_sRGB) png_handle_sRGB(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_iCCP_SUPPORTED - else if (!png_memcmp(chunk_name, png_iCCP, 4)) + else if (chunk_name == png_iCCP) png_handle_iCCP(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_sPLT_SUPPORTED - else if (!png_memcmp(chunk_name, png_sPLT, 4)) + else if (chunk_name == png_sPLT) png_handle_sPLT(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_tEXt_SUPPORTED - else if (!png_memcmp(chunk_name, png_tEXt, 4)) + else if (chunk_name == png_tEXt) png_handle_tEXt(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_tIME_SUPPORTED - else if (!png_memcmp(chunk_name, png_tIME, 4)) + else if (chunk_name == png_tIME) png_handle_tIME(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_tRNS_SUPPORTED - else if (!png_memcmp(chunk_name, png_tRNS, 4)) + else if (chunk_name == png_tRNS) png_handle_tRNS(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_zTXt_SUPPORTED - else if (!png_memcmp(chunk_name, png_zTXt, 4)) + else if (chunk_name == png_zTXt) png_handle_zTXt(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_iTXt_SUPPORTED - else if (!png_memcmp(chunk_name, png_iTXt, 4)) + else if (chunk_name == png_iTXt) png_handle_iTXt(png_ptr, info_ptr, length); #endif + else - png_handle_unknown(png_ptr, info_ptr, length); + png_handle_unknown(png_ptr, info_ptr, length, + PNG_HANDLE_CHUNK_AS_DEFAULT); } } #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ /* Optional call to update the users info_ptr structure */ void PNGAPI -png_read_update_info(png_structp png_ptr, png_infop info_ptr) +png_read_update_info(png_structrp png_ptr, png_inforp info_ptr) { png_debug(1, "in png_read_update_info"); - if (png_ptr == NULL) - return; - if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) - png_read_start_row(png_ptr); - else - png_warning(png_ptr, - "Ignoring extra png_read_update_info() call; row buffer not reallocated"); + if (png_ptr != NULL) + { + if ((png_ptr->flags & PNG_FLAG_ROW_INIT) == 0) + { + png_read_start_row(png_ptr); - png_read_transform_info(png_ptr, info_ptr); +# ifdef PNG_READ_TRANSFORMS_SUPPORTED + png_read_transform_info(png_ptr, info_ptr); +# else + PNG_UNUSED(info_ptr) +# endif + } + + /* New in 1.6.0 this avoids the bug of doing the initializations twice */ + else + png_app_error(png_ptr, + "png_read_update_info/png_start_read_image: duplicate call"); + } } #ifdef PNG_SEQUENTIAL_READ_SUPPORTED @@ -423,35 +287,49 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr) * If the user doesn't call this, we will do it ourselves. */ void PNGAPI -png_start_read_image(png_structp png_ptr) +png_start_read_image(png_structrp png_ptr) { png_debug(1, "in png_start_read_image"); - if (png_ptr == NULL) - return; - if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) - png_read_start_row(png_ptr); + if (png_ptr != NULL) + { + if ((png_ptr->flags & PNG_FLAG_ROW_INIT) == 0) + png_read_start_row(png_ptr); + + /* New in 1.6.0 this avoids the bug of doing the initializations twice */ + else + png_app_error(png_ptr, + "png_start_read_image/png_read_update_info: duplicate call"); + } } #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ #ifdef PNG_SEQUENTIAL_READ_SUPPORTED void PNGAPI -png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) +png_read_row(png_structrp png_ptr, png_bytep row, png_bytep dsp_row) { - PNG_IDAT; - PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, - 0xff}; - PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; - int ret; + png_row_info row_info; if (png_ptr == NULL) return; png_debug2(1, "in png_read_row (row %lu, pass %d)", - (unsigned long) png_ptr->row_number, png_ptr->pass); + (unsigned long)png_ptr->row_number, png_ptr->pass); + /* png_read_start_row sets the information (in particular iwidth) for this + * interlace pass. + */ if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) png_read_start_row(png_ptr); + + /* 1.5.6: row_info moved out of png_struct to a local here. */ + row_info.width = png_ptr->iwidth; /* NOTE: width of current interlaced row */ + row_info.color_type = png_ptr->color_type; + row_info.bit_depth = png_ptr->bit_depth; + row_info.channels = png_ptr->channels; + row_info.pixel_depth = png_ptr->pixel_depth; + row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width); + if (png_ptr->row_number == 0 && png_ptr->pass == 0) { /* Check for transforms that have been set but were defined out */ @@ -459,27 +337,33 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if (png_ptr->transformations & PNG_INVERT_MONO) png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined"); #endif + #if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED) if (png_ptr->transformations & PNG_FILLER) png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined"); #endif + #if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \ !defined(PNG_READ_PACKSWAP_SUPPORTED) if (png_ptr->transformations & PNG_PACKSWAP) png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined"); #endif + #if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED) if (png_ptr->transformations & PNG_PACK) png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined"); #endif + #if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) if (png_ptr->transformations & PNG_SHIFT) png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined"); #endif + #if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED) if (png_ptr->transformations & PNG_BGR) png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined"); #endif + #if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED) if (png_ptr->transformations & PNG_SWAP_BYTES) png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined"); @@ -487,7 +371,12 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) } #ifdef PNG_READ_INTERLACING_SUPPORTED - /* If interlaced and we do not need a new row, combine row and return */ + /* If interlaced and we do not need a new row, combine row and return. + * Notice that the pixels we have from previous rows have been transformed + * already; we can only combine like with like (transformed or + * untransformed) and, because of the libpng API for interlaced images, this + * means we must transform before de-interlacing. + */ if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) { switch (png_ptr->pass) @@ -496,8 +385,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if (png_ptr->row_number & 0x07) { if (dsp_row != NULL) - png_combine_row(png_ptr, dsp_row, - png_pass_dsp_mask[png_ptr->pass]); + png_combine_row(png_ptr, dsp_row, 1/*display*/); png_read_finish_row(png_ptr); return; } @@ -507,8 +395,8 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) { if (dsp_row != NULL) - png_combine_row(png_ptr, dsp_row, - png_pass_dsp_mask[png_ptr->pass]); + png_combine_row(png_ptr, dsp_row, 1/*display*/); + png_read_finish_row(png_ptr); return; } @@ -518,8 +406,8 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if ((png_ptr->row_number & 0x07) != 4) { if (dsp_row != NULL && (png_ptr->row_number & 4)) - png_combine_row(png_ptr, dsp_row, - png_pass_dsp_mask[png_ptr->pass]); + png_combine_row(png_ptr, dsp_row, 1/*display*/); + png_read_finish_row(png_ptr); return; } @@ -529,8 +417,8 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if ((png_ptr->row_number & 3) || png_ptr->width < 3) { if (dsp_row != NULL) - png_combine_row(png_ptr, dsp_row, - png_pass_dsp_mask[png_ptr->pass]); + png_combine_row(png_ptr, dsp_row, 1/*display*/); + png_read_finish_row(png_ptr); return; } @@ -540,8 +428,8 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if ((png_ptr->row_number & 3) != 2) { if (dsp_row != NULL && (png_ptr->row_number & 2)) - png_combine_row(png_ptr, dsp_row, - png_pass_dsp_mask[png_ptr->pass]); + png_combine_row(png_ptr, dsp_row, 1/*display*/); + png_read_finish_row(png_ptr); return; } @@ -551,8 +439,8 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if ((png_ptr->row_number & 1) || png_ptr->width < 2) { if (dsp_row != NULL) - png_combine_row(png_ptr, dsp_row, - png_pass_dsp_mask[png_ptr->pass]); + png_combine_row(png_ptr, dsp_row, 1/*display*/); + png_read_finish_row(png_ptr); return; } @@ -573,73 +461,50 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if (!(png_ptr->mode & PNG_HAVE_IDAT)) png_error(png_ptr, "Invalid attempt to read row data"); - png_ptr->zstream.next_out = png_ptr->row_buf; - png_ptr->zstream.avail_out = - (uInt)(PNG_ROWBYTES(png_ptr->pixel_depth, - png_ptr->iwidth) + 1); - do + /* Fill the row with IDAT data: */ + png_read_IDAT_data(png_ptr, png_ptr->row_buf, row_info.rowbytes + 1); + + if (png_ptr->row_buf[0] > PNG_FILTER_VALUE_NONE) { - if (!(png_ptr->zstream.avail_in)) - { - while (!png_ptr->idat_size) - { - png_crc_finish(png_ptr, 0); + if (png_ptr->row_buf[0] < PNG_FILTER_VALUE_LAST) + png_read_filter_row(png_ptr, &row_info, png_ptr->row_buf + 1, + png_ptr->prev_row + 1, png_ptr->row_buf[0]); + else + png_error(png_ptr, "bad adaptive filter value"); + } - png_ptr->idat_size = png_read_chunk_header(png_ptr); - if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) - png_error(png_ptr, "Not enough image data"); - } - png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; - png_ptr->zstream.next_in = png_ptr->zbuf; - if (png_ptr->zbuf_size > png_ptr->idat_size) - png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; - png_crc_read(png_ptr, png_ptr->zbuf, - (png_size_t)png_ptr->zstream.avail_in); - png_ptr->idat_size -= png_ptr->zstream.avail_in; - } - ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); - if (ret == Z_STREAM_END) - { - if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in || - png_ptr->idat_size) - png_benign_error(png_ptr, "Extra compressed data"); - png_ptr->mode |= PNG_AFTER_IDAT; - png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; - break; - } - if (ret != Z_OK) - png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : - "Decompression error"); - - } while (png_ptr->zstream.avail_out); - - png_ptr->row_info.color_type = png_ptr->color_type; - png_ptr->row_info.width = png_ptr->iwidth; - png_ptr->row_info.channels = png_ptr->channels; - png_ptr->row_info.bit_depth = png_ptr->bit_depth; - png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; - png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, - png_ptr->row_info.width); - - if (png_ptr->row_buf[0]) - png_read_filter_row(png_ptr, &(png_ptr->row_info), - png_ptr->row_buf + 1, png_ptr->prev_row + 1, - (int)(png_ptr->row_buf[0])); - - png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1); + /* libpng 1.5.6: the following line was copying png_ptr->rowbytes before + * 1.5.6, while the buffer really is this big in current versions of libpng + * it may not be in the future, so this was changed just to copy the + * interlaced count: + */ + memcpy(png_ptr->prev_row, png_ptr->row_buf, row_info.rowbytes + 1); #ifdef PNG_MNG_FEATURES_SUPPORTED if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && - (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) + (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) { /* Intrapixel differencing */ - png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_read_intrapixel(&row_info, png_ptr->row_buf + 1); } #endif - if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) - png_do_read_transformations(png_ptr); +#ifdef PNG_READ_TRANSFORMS_SUPPORTED + if (png_ptr->transformations) + png_do_read_transformations(png_ptr, &row_info); +#endif + + /* The transformed pixel depth should match the depth now in row_info. */ + if (png_ptr->transformed_pixel_depth == 0) + { + png_ptr->transformed_pixel_depth = row_info.pixel_depth; + if (row_info.pixel_depth > png_ptr->maximum_pixel_depth) + png_error(png_ptr, "sequential row overflow"); + } + + else if (png_ptr->transformed_pixel_depth != row_info.pixel_depth) + png_error(png_ptr, "internal sequential row size calculation error"); #ifdef PNG_READ_INTERLACING_SUPPORTED /* Blow up interlaced rows to full size */ @@ -647,31 +512,30 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) (png_ptr->transformations & PNG_INTERLACE)) { if (png_ptr->pass < 6) - /* Old interface (pre-1.0.9): - * png_do_read_interlace(&(png_ptr->row_info), - * png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); - */ - png_do_read_interlace(png_ptr); + png_do_read_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass, + png_ptr->transformations); if (dsp_row != NULL) - png_combine_row(png_ptr, dsp_row, - png_pass_dsp_mask[png_ptr->pass]); + png_combine_row(png_ptr, dsp_row, 1/*display*/); + if (row != NULL) - png_combine_row(png_ptr, row, - png_pass_mask[png_ptr->pass]); + png_combine_row(png_ptr, row, 0/*row*/); } + else #endif { if (row != NULL) - png_combine_row(png_ptr, row, 0xff); + png_combine_row(png_ptr, row, -1/*ignored*/); + if (dsp_row != NULL) - png_combine_row(png_ptr, dsp_row, 0xff); + png_combine_row(png_ptr, dsp_row, -1/*ignored*/); } png_read_finish_row(png_ptr); if (png_ptr->read_row_fn != NULL) (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); + } #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ @@ -701,8 +565,8 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) */ void PNGAPI -png_read_rows(png_structp png_ptr, png_bytepp row, - png_bytepp display_row, png_uint_32 num_rows) +png_read_rows(png_structrp png_ptr, png_bytepp row, + png_bytepp display_row, png_uint_32 num_rows) { png_uint_32 i; png_bytepp rp; @@ -712,6 +576,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row, if (png_ptr == NULL) return; + rp = row; dp = display_row; if (rp != NULL && dp != NULL) @@ -722,6 +587,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row, png_read_row(png_ptr, rptr, dptr); } + else if (rp != NULL) for (i = 0; i < num_rows; i++) { @@ -729,6 +595,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row, png_read_row(png_ptr, rptr, NULL); rp++; } + else if (dp != NULL) for (i = 0; i < num_rows; i++) { @@ -753,7 +620,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row, * [*] png_handle_alpha() does not exist yet, as of this version of libpng */ void PNGAPI -png_read_image(png_structp png_ptr, png_bytepp image) +png_read_image(png_structrp png_ptr, png_bytepp image) { png_uint_32 i, image_height; int pass, j; @@ -765,17 +632,40 @@ png_read_image(png_structp png_ptr, png_bytepp image) return; #ifdef PNG_READ_INTERLACING_SUPPORTED - pass = png_set_interlace_handling(png_ptr); + if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) + { + pass = png_set_interlace_handling(png_ptr); + /* And make sure transforms are initialized. */ + png_start_read_image(png_ptr); + } + else + { + if (png_ptr->interlaced && !(png_ptr->transformations & PNG_INTERLACE)) + { + /* Caller called png_start_read_image or png_read_update_info without + * first turning on the PNG_INTERLACE transform. We can fix this here, + * but the caller should do it! + */ + png_warning(png_ptr, "Interlace handling should be turned on when " + "using png_read_image"); + /* Make sure this is set correctly */ + png_ptr->num_rows = png_ptr->height; + } + + /* Obtain the pass number, which also turns on the PNG_INTERLACE flag in + * the above error case. + */ + pass = png_set_interlace_handling(png_ptr); + } #else if (png_ptr->interlaced) png_error(png_ptr, - "Cannot read interlaced image -- interlace handler disabled"); + "Cannot read interlaced image -- interlace handler disabled"); + pass = 1; #endif - image_height=png_ptr->height; - png_ptr->num_rows = image_height; /* Make sure this is set correctly */ for (j = 0; j < pass; j++) { @@ -795,384 +685,246 @@ png_read_image(png_structp png_ptr, png_bytepp image) * or time information at the end of the file, if info is not NULL. */ void PNGAPI -png_read_end(png_structp png_ptr, png_infop info_ptr) +png_read_end(png_structrp png_ptr, png_inforp info_ptr) { +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + int keep; +#endif + png_debug(1, "in png_read_end"); if (png_ptr == NULL) return; - png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */ + + /* If png_read_end is called in the middle of reading the rows there may + * still be pending IDAT data and an owned zstream. Deal with this here. + */ +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + if (!png_chunk_unknown_handling(png_ptr, png_IDAT)) +#endif + png_read_finish_IDAT(png_ptr); + +#ifdef PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED + /* Report invalid palette index; added at libng-1.5.10 */ + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + png_ptr->num_palette_max > png_ptr->num_palette) + png_benign_error(png_ptr, "Read palette index exceeding num_palette"); +#endif do { - PNG_IHDR; - PNG_IDAT; - PNG_IEND; - PNG_PLTE; -#ifdef PNG_READ_bKGD_SUPPORTED - PNG_bKGD; -#endif -#ifdef PNG_READ_cHRM_SUPPORTED - PNG_cHRM; -#endif -#ifdef PNG_READ_gAMA_SUPPORTED - PNG_gAMA; -#endif -#ifdef PNG_READ_hIST_SUPPORTED - PNG_hIST; -#endif -#ifdef PNG_READ_iCCP_SUPPORTED - PNG_iCCP; -#endif -#ifdef PNG_READ_iTXt_SUPPORTED - PNG_iTXt; -#endif -#ifdef PNG_READ_oFFs_SUPPORTED - PNG_oFFs; -#endif -#ifdef PNG_READ_pCAL_SUPPORTED - PNG_pCAL; -#endif -#ifdef PNG_READ_pHYs_SUPPORTED - PNG_pHYs; -#endif -#ifdef PNG_READ_sBIT_SUPPORTED - PNG_sBIT; -#endif -#ifdef PNG_READ_sCAL_SUPPORTED - PNG_sCAL; -#endif -#ifdef PNG_READ_sPLT_SUPPORTED - PNG_sPLT; -#endif -#ifdef PNG_READ_sRGB_SUPPORTED - PNG_sRGB; -#endif -#ifdef PNG_READ_tEXt_SUPPORTED - PNG_tEXt; -#endif -#ifdef PNG_READ_tIME_SUPPORTED - PNG_tIME; -#endif -#ifdef PNG_READ_tRNS_SUPPORTED - PNG_tRNS; -#endif -#ifdef PNG_READ_zTXt_SUPPORTED - PNG_zTXt; -#endif png_uint_32 length = png_read_chunk_header(png_ptr); - PNG_CONST png_bytep chunk_name = png_ptr->chunk_name; + png_uint_32 chunk_name = png_ptr->chunk_name; - if (!png_memcmp(chunk_name, png_IHDR, 4)) + if (chunk_name == png_IHDR) png_handle_IHDR(png_ptr, info_ptr, length); - else if (!png_memcmp(chunk_name, png_IEND, 4)) + + else if (chunk_name == png_IEND) png_handle_IEND(png_ptr, info_ptr, length); + #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - else if (png_handle_as_unknown(png_ptr, chunk_name)) + else if ((keep = png_chunk_unknown_handling(png_ptr, chunk_name)) != 0) { - if (!png_memcmp(chunk_name, png_IDAT, 4)) + if (chunk_name == png_IDAT) { if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) png_benign_error(png_ptr, "Too many IDATs found"); } - png_handle_unknown(png_ptr, info_ptr, length); - if (!png_memcmp(chunk_name, png_PLTE, 4)) + png_handle_unknown(png_ptr, info_ptr, length, keep); + if (chunk_name == png_PLTE) png_ptr->mode |= PNG_HAVE_PLTE; } #endif - else if (!png_memcmp(chunk_name, png_IDAT, 4)) + + else if (chunk_name == png_IDAT) { /* Zero length IDATs are legal after the last IDAT has been * read, but not after other chunks have been read. */ if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) png_benign_error(png_ptr, "Too many IDATs found"); + png_crc_finish(png_ptr, length); } - else if (!png_memcmp(chunk_name, png_PLTE, 4)) + else if (chunk_name == png_PLTE) png_handle_PLTE(png_ptr, info_ptr, length); + #ifdef PNG_READ_bKGD_SUPPORTED - else if (!png_memcmp(chunk_name, png_bKGD, 4)) + else if (chunk_name == png_bKGD) png_handle_bKGD(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_cHRM_SUPPORTED - else if (!png_memcmp(chunk_name, png_cHRM, 4)) + else if (chunk_name == png_cHRM) png_handle_cHRM(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_gAMA_SUPPORTED - else if (!png_memcmp(chunk_name, png_gAMA, 4)) + else if (chunk_name == png_gAMA) png_handle_gAMA(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_hIST_SUPPORTED - else if (!png_memcmp(chunk_name, png_hIST, 4)) + else if (chunk_name == png_hIST) png_handle_hIST(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_oFFs_SUPPORTED - else if (!png_memcmp(chunk_name, png_oFFs, 4)) + else if (chunk_name == png_oFFs) png_handle_oFFs(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_pCAL_SUPPORTED - else if (!png_memcmp(chunk_name, png_pCAL, 4)) + else if (chunk_name == png_pCAL) png_handle_pCAL(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_sCAL_SUPPORTED - else if (!png_memcmp(chunk_name, png_sCAL, 4)) + else if (chunk_name == png_sCAL) png_handle_sCAL(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_pHYs_SUPPORTED - else if (!png_memcmp(chunk_name, png_pHYs, 4)) + else if (chunk_name == png_pHYs) png_handle_pHYs(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_sBIT_SUPPORTED - else if (!png_memcmp(chunk_name, png_sBIT, 4)) + else if (chunk_name == png_sBIT) png_handle_sBIT(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_sRGB_SUPPORTED - else if (!png_memcmp(chunk_name, png_sRGB, 4)) + else if (chunk_name == png_sRGB) png_handle_sRGB(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_iCCP_SUPPORTED - else if (!png_memcmp(chunk_name, png_iCCP, 4)) + else if (chunk_name == png_iCCP) png_handle_iCCP(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_sPLT_SUPPORTED - else if (!png_memcmp(chunk_name, png_sPLT, 4)) + else if (chunk_name == png_sPLT) png_handle_sPLT(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_tEXt_SUPPORTED - else if (!png_memcmp(chunk_name, png_tEXt, 4)) + else if (chunk_name == png_tEXt) png_handle_tEXt(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_tIME_SUPPORTED - else if (!png_memcmp(chunk_name, png_tIME, 4)) + else if (chunk_name == png_tIME) png_handle_tIME(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_tRNS_SUPPORTED - else if (!png_memcmp(chunk_name, png_tRNS, 4)) + else if (chunk_name == png_tRNS) png_handle_tRNS(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_zTXt_SUPPORTED - else if (!png_memcmp(chunk_name, png_zTXt, 4)) + else if (chunk_name == png_zTXt) png_handle_zTXt(png_ptr, info_ptr, length); #endif + #ifdef PNG_READ_iTXt_SUPPORTED - else if (!png_memcmp(chunk_name, png_iTXt, 4)) + else if (chunk_name == png_iTXt) png_handle_iTXt(png_ptr, info_ptr, length); #endif + else - png_handle_unknown(png_ptr, info_ptr, length); + png_handle_unknown(png_ptr, info_ptr, length, + PNG_HANDLE_CHUNK_AS_DEFAULT); } while (!(png_ptr->mode & PNG_HAVE_IEND)); } #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ -/* Free all memory used by the read */ -void PNGAPI -png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, - png_infopp end_info_ptr_ptr) +/* Free all memory used in the read struct */ +static void +png_read_destroy(png_structrp png_ptr) { - png_structp png_ptr = NULL; - png_infop info_ptr = NULL, end_info_ptr = NULL; -#ifdef PNG_USER_MEM_SUPPORTED - png_free_ptr free_fn = NULL; - png_voidp mem_ptr = NULL; -#endif - - png_debug(1, "in png_destroy_read_struct"); - - if (png_ptr_ptr != NULL) - png_ptr = *png_ptr_ptr; - if (png_ptr == NULL) - return; - -#ifdef PNG_USER_MEM_SUPPORTED - free_fn = png_ptr->free_fn; - mem_ptr = png_ptr->mem_ptr; -#endif - - if (info_ptr_ptr != NULL) - info_ptr = *info_ptr_ptr; - - if (end_info_ptr_ptr != NULL) - end_info_ptr = *end_info_ptr_ptr; - - png_read_destroy(png_ptr, info_ptr, end_info_ptr); - - if (info_ptr != NULL) - { -#ifdef PNG_TEXT_SUPPORTED - png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1); -#endif - -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, - (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)info_ptr); -#endif - *info_ptr_ptr = NULL; - } - - if (end_info_ptr != NULL) - { -#ifdef PNG_READ_TEXT_SUPPORTED - png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1); -#endif -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn, - (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)end_info_ptr); -#endif - *end_info_ptr_ptr = NULL; - } - - if (png_ptr != NULL) - { -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, - (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)png_ptr); -#endif - *png_ptr_ptr = NULL; - } -} - -/* Free all memory used by the read (old method) */ -void /* PRIVATE */ -png_read_destroy(png_structp png_ptr, png_infop info_ptr, - png_infop end_info_ptr) -{ -#ifdef PNG_SETJMP_SUPPORTED - jmp_buf tmp_jmp; -#endif - png_error_ptr error_fn; - png_error_ptr warning_fn; - png_voidp error_ptr; -#ifdef PNG_USER_MEM_SUPPORTED - png_free_ptr free_fn; -#endif - png_debug(1, "in png_read_destroy"); - if (info_ptr != NULL) - png_info_destroy(png_ptr, info_ptr); +#ifdef PNG_READ_GAMMA_SUPPORTED + png_destroy_gamma_table(png_ptr); +#endif - if (end_info_ptr != NULL) - png_info_destroy(png_ptr, end_info_ptr); - - png_free(png_ptr, png_ptr->zbuf); png_free(png_ptr, png_ptr->big_row_buf); - png_free(png_ptr, png_ptr->prev_row); - png_free(png_ptr, png_ptr->chunkdata); + png_free(png_ptr, png_ptr->big_prev_row); + png_free(png_ptr, png_ptr->read_buffer); + #ifdef PNG_READ_QUANTIZE_SUPPORTED png_free(png_ptr, png_ptr->palette_lookup); png_free(png_ptr, png_ptr->quantize_index); #endif -#ifdef PNG_READ_GAMMA_SUPPORTED - png_free(png_ptr, png_ptr->gamma_table); -#endif -#ifdef PNG_READ_BACKGROUND_SUPPORTED - png_free(png_ptr, png_ptr->gamma_from_1); - png_free(png_ptr, png_ptr->gamma_to_1); -#endif + if (png_ptr->free_me & PNG_FREE_PLTE) png_zfree(png_ptr, png_ptr->palette); png_ptr->free_me &= ~PNG_FREE_PLTE; + #if defined(PNG_tRNS_SUPPORTED) || \ defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) if (png_ptr->free_me & PNG_FREE_TRNS) png_free(png_ptr, png_ptr->trans_alpha); png_ptr->free_me &= ~PNG_FREE_TRNS; #endif -#ifdef PNG_READ_hIST_SUPPORTED - if (png_ptr->free_me & PNG_FREE_HIST) - png_free(png_ptr, png_ptr->hist); - png_ptr->free_me &= ~PNG_FREE_HIST; -#endif -#ifdef PNG_READ_GAMMA_SUPPORTED - if (png_ptr->gamma_16_table != NULL) - { - int i; - int istop = (1 << (8 - png_ptr->gamma_shift)); - for (i = 0; i < istop; i++) - { - png_free(png_ptr, png_ptr->gamma_16_table[i]); - } - png_free(png_ptr, png_ptr->gamma_16_table); - } -#ifdef PNG_READ_BACKGROUND_SUPPORTED - if (png_ptr->gamma_16_from_1 != NULL) - { - int i; - int istop = (1 << (8 - png_ptr->gamma_shift)); - for (i = 0; i < istop; i++) - { - png_free(png_ptr, png_ptr->gamma_16_from_1[i]); - } - png_free(png_ptr, png_ptr->gamma_16_from_1); - } - if (png_ptr->gamma_16_to_1 != NULL) - { - int i; - int istop = (1 << (8 - png_ptr->gamma_shift)); - for (i = 0; i < istop; i++) - { - png_free(png_ptr, png_ptr->gamma_16_to_1[i]); - } - png_free(png_ptr, png_ptr->gamma_16_to_1); - } -#endif -#endif -#ifdef PNG_TIME_RFC1123_SUPPORTED - png_free(png_ptr, png_ptr->time_buffer); -#endif inflateEnd(&png_ptr->zstream); + #ifdef PNG_PROGRESSIVE_READ_SUPPORTED png_free(png_ptr, png_ptr->save_buffer); #endif -#ifdef PNG_PROGRESSIVE_READ_SUPPORTED -#ifdef PNG_TEXT_SUPPORTED - png_free(png_ptr, png_ptr->current_text); -#endif /* PNG_TEXT_SUPPORTED */ -#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ +#if defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) &&\ + defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) + png_free(png_ptr, png_ptr->unknown_chunk.data); +#endif - /* Save the important info out of the png_struct, in case it is - * being used again. +#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED + png_free(png_ptr, png_ptr->chunk_list); +#endif + + /* NOTE: the 'setjmp' buffer may still be allocated and the memory and error + * callbacks are still set at this point. They are required to complete the + * destruction of the png_struct itself. */ -#ifdef PNG_SETJMP_SUPPORTED - png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf)); -#endif +} - error_fn = png_ptr->error_fn; - warning_fn = png_ptr->warning_fn; - error_ptr = png_ptr->error_ptr; -#ifdef PNG_USER_MEM_SUPPORTED - free_fn = png_ptr->free_fn; -#endif +/* Free all memory used by the read */ +void PNGAPI +png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, + png_infopp end_info_ptr_ptr) +{ + png_structrp png_ptr = NULL; - png_memset(png_ptr, 0, png_sizeof(png_struct)); + png_debug(1, "in png_destroy_read_struct"); - png_ptr->error_fn = error_fn; - png_ptr->warning_fn = warning_fn; - png_ptr->error_ptr = error_ptr; -#ifdef PNG_USER_MEM_SUPPORTED - png_ptr->free_fn = free_fn; -#endif + if (png_ptr_ptr != NULL) + png_ptr = *png_ptr_ptr; -#ifdef PNG_SETJMP_SUPPORTED - png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); -#endif + if (png_ptr == NULL) + return; + /* libpng 1.6.0: use the API to destroy info structs to ensure consistent + * behavior. Prior to 1.6.0 libpng did extra 'info' destruction in this API. + * The extra was, apparently, unnecessary yet this hides memory leak bugs. + */ + png_destroy_info_struct(png_ptr, end_info_ptr_ptr); + png_destroy_info_struct(png_ptr, info_ptr_ptr); + + *png_ptr_ptr = NULL; + png_read_destroy(png_ptr); + png_destroy_png_struct(png_ptr); } void PNGAPI -png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn) +png_set_read_status_fn(png_structrp png_ptr, png_read_status_ptr read_row_fn) { if (png_ptr == NULL) return; + png_ptr->read_row_fn = read_row_fn; } @@ -1180,26 +932,40 @@ png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn) #ifdef PNG_SEQUENTIAL_READ_SUPPORTED #ifdef PNG_INFO_IMAGE_SUPPORTED void PNGAPI -png_read_png(png_structp png_ptr, png_infop info_ptr, +png_read_png(png_structrp png_ptr, png_inforp info_ptr, int transforms, voidp params) { int row; - if (png_ptr == NULL) + if (png_ptr == NULL || info_ptr == NULL) return; /* png_read_info() gives us all of the information from the * PNG file before the first IDAT (image data chunk). */ png_read_info(png_ptr, info_ptr); - if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep)) + if (info_ptr->height > PNG_UINT_32_MAX/(sizeof (png_bytep))) png_error(png_ptr, "Image is too high to process with png_read_png()"); /* -------------- image transformations start here ------------------- */ -#ifdef PNG_READ_16_TO_8_SUPPORTED - /* Tell libpng to strip 16 bit/color files down to 8 bits per color. +#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED + /* Tell libpng to strip 16-bit/color files down to 8 bits per color. + */ + if (transforms & PNG_TRANSFORM_SCALE_16) + { + /* Added at libpng-1.5.4. "strip_16" produces the same result that it + * did in earlier versions, while "scale_16" is now more accurate. + */ + png_set_scale_16(png_ptr); + } +#endif + +#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED + /* If both SCALE and STRIP are required pngrtran will effectively cancel the + * latter by doing SCALE first. This is ok and allows apps not to check for + * which is supported to get the right answer. */ if (transforms & PNG_TRANSFORM_STRIP_16) png_set_strip_16(png_ptr); @@ -1268,44 +1034,50 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, #endif #ifdef PNG_READ_BGR_SUPPORTED - /* Flip the RGB pixels to BGR (or RGBA to BGRA) - */ + /* Flip the RGB pixels to BGR (or RGBA to BGRA) */ if (transforms & PNG_TRANSFORM_BGR) png_set_bgr(png_ptr); #endif #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED - /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) - */ + /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */ if (transforms & PNG_TRANSFORM_SWAP_ALPHA) - png_set_swap_alpha(png_ptr); + png_set_swap_alpha(png_ptr); #endif #ifdef PNG_READ_SWAP_SUPPORTED - /* Swap bytes of 16 bit files to least significant byte first - */ + /* Swap bytes of 16-bit files to least significant byte first */ if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) png_set_swap(png_ptr); #endif /* Added at libpng-1.2.41 */ #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED - /* Invert the alpha channel from opacity to transparency - */ + /* Invert the alpha channel from opacity to transparency */ if (transforms & PNG_TRANSFORM_INVERT_ALPHA) - png_set_invert_alpha(png_ptr); + png_set_invert_alpha(png_ptr); #endif /* Added at libpng-1.2.41 */ #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED - /* Expand grayscale image to RGB - */ + /* Expand grayscale image to RGB */ if (transforms & PNG_TRANSFORM_GRAY_TO_RGB) - png_set_gray_to_rgb(png_ptr); + png_set_gray_to_rgb(png_ptr); +#endif + +/* Added at libpng-1.5.4 */ +#ifdef PNG_READ_EXPAND_16_SUPPORTED + if (transforms & PNG_TRANSFORM_EXPAND_16) + png_set_expand_16(png_ptr); #endif /* We don't handle adding filler bytes */ + /* We use png_read_image and rely on that for interlace handling, but we also + * call png_read_update_info therefore must turn on interlace handling now: + */ + (void)png_set_interlace_handling(png_ptr); + /* Optional call to gamma correct and add the background to the palette * and update info structure. REQUIRED if you are expecting libpng to * update the palette for you (i.e., you selected such a transform above). @@ -1317,10 +1089,10 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); if (info_ptr->row_pointers == NULL) { - png_uint_32 iptr; + png_uint_32 iptr; info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr, - info_ptr->height * png_sizeof(png_bytep)); + info_ptr->height * (sizeof (png_bytep))); for (iptr=0; iptrheight; iptr++) info_ptr->row_pointers[iptr] = NULL; @@ -1337,10 +1109,2892 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */ png_read_end(png_ptr, info_ptr); - transforms = transforms; /* Quiet compiler warnings */ - params = params; + PNG_UNUSED(transforms) /* Quiet compiler warnings */ + PNG_UNUSED(params) } #endif /* PNG_INFO_IMAGE_SUPPORTED */ #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ + +#ifdef PNG_SIMPLIFIED_READ_SUPPORTED +/* SIMPLIFIED READ + * + * This code currently relies on the sequential reader, though it could easily + * be made to work with the progressive one. + */ +/* Arguments to png_image_finish_read: */ + +/* Encoding of PNG data (used by the color-map code) */ +/* TODO: change these, dang, ANSI-C reserves the 'E' namespace. */ +# define E_NOTSET 0 /* File encoding not yet known */ +# define E_sRGB 1 /* 8-bit encoded to sRGB gamma */ +# define E_LINEAR 2 /* 16-bit linear: not encoded, NOT pre-multiplied! */ +# define E_FILE 3 /* 8-bit encoded to file gamma, not sRGB or linear */ +# define E_LINEAR8 4 /* 8-bit linear: only from a file value */ + +/* Color-map processing: after libpng has run on the PNG image further + * processing may be needed to conver the data to color-map indicies. + */ +#define PNG_CMAP_NONE 0 +#define PNG_CMAP_GA 1 /* Process GA data to a color-map with alpha */ +#define PNG_CMAP_TRANS 2 /* Process GA data to a background index */ +#define PNG_CMAP_RGB 3 /* Process RGB data */ +#define PNG_CMAP_RGB_ALPHA 4 /* Process RGBA data */ + +/* The following document where the background is for each processing case. */ +#define PNG_CMAP_NONE_BACKGROUND 256 +#define PNG_CMAP_GA_BACKGROUND 231 +#define PNG_CMAP_TRANS_BACKGROUND 254 +#define PNG_CMAP_RGB_BACKGROUND 256 +#define PNG_CMAP_RGB_ALPHA_BACKGROUND 216 + +typedef struct +{ + /* Arguments: */ + png_imagep image; + png_voidp buffer; + png_int_32 row_stride; + png_voidp colormap; + png_const_colorp background; + /* Local variables: */ + png_voidp local_row; + png_voidp first_row; + ptrdiff_t row_bytes; /* step between rows */ + int file_encoding; /* E_ values above */ + png_fixed_point gamma_to_linear; /* For E_FILE, reciprocal of gamma */ + int colormap_processing; /* PNG_CMAP_ values above */ +} png_image_read_control; + +/* Do all the *safe* initialization - 'safe' means that png_error won't be + * called, so setting up the jmp_buf is not required. This means that anything + * called from here must *not* call png_malloc - it has to call png_malloc_warn + * instead so that control is returned safely back to this routine. + */ +static int +png_image_read_init(png_imagep image) +{ + if (image->opaque == NULL) + { + png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, image, + png_safe_error, png_safe_warning); + + /* And set the rest of the structure to NULL to ensure that the various + * fields are consistent. + */ + memset(image, 0, (sizeof *image)); + image->version = PNG_IMAGE_VERSION; + + if (png_ptr != NULL) + { + png_infop info_ptr = png_create_info_struct(png_ptr); + + if (info_ptr != NULL) + { + png_controlp control = png_voidcast(png_controlp, + png_malloc_warn(png_ptr, (sizeof *control))); + + if (control != NULL) + { + memset(control, 0, (sizeof *control)); + + control->png_ptr = png_ptr; + control->info_ptr = info_ptr; + control->for_write = 0; + + image->opaque = control; + return 1; + } + + /* Error clean up */ + png_destroy_info_struct(png_ptr, &info_ptr); + } + + png_destroy_read_struct(&png_ptr, NULL, NULL); + } + + return png_image_error(image, "png_image_read: out of memory"); + } + + return png_image_error(image, "png_image_read: opaque pointer not NULL"); +} + +/* Utility to find the base format of a PNG file from a png_struct. */ +static png_uint_32 +png_image_format(png_structrp png_ptr) +{ + png_uint_32 format = 0; + + if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) + format |= PNG_FORMAT_FLAG_COLOR; + + if (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) + format |= PNG_FORMAT_FLAG_ALPHA; + + /* Use png_ptr here, not info_ptr, because by examination png_handle_tRNS + * sets the png_struct fields; that's all we are interested in here. The + * precise interaction with an app call to png_set_tRNS and PNG file reading + * is unclear. + */ + else if (png_ptr->num_trans > 0) + format |= PNG_FORMAT_FLAG_ALPHA; + + if (png_ptr->bit_depth == 16) + format |= PNG_FORMAT_FLAG_LINEAR; + + if (png_ptr->color_type & PNG_COLOR_MASK_PALETTE) + format |= PNG_FORMAT_FLAG_COLORMAP; + + return format; +} + +/* Is the given gamma significantly different from sRGB? The test is the same + * one used in pngrtran.c when deciding whether to do gamma correction. The + * arithmetic optimizes the division by using the fact that the inverse of the + * file sRGB gamma is 2.2 + */ +static int +png_gamma_not_sRGB(png_fixed_point g) +{ + if (g < PNG_FP_1) + { + /* An uninitialized gamma is assumed to be sRGB for the simplified API. */ + if (g == 0) + return 0; + + return png_gamma_significant((g * 11 + 2)/5 /* i.e. *2.2, rounded */); + } + + return 1; +} + +/* Do the main body of a 'png_image_begin_read' function; read the PNG file + * header and fill in all the information. This is executed in a safe context, + * unlike the init routine above. + */ +static int +png_image_read_header(png_voidp argument) +{ + png_imagep image = png_voidcast(png_imagep, argument); + png_structrp png_ptr = image->opaque->png_ptr; + png_inforp info_ptr = image->opaque->info_ptr; + + png_set_benign_errors(png_ptr, 1/*warn*/); + png_read_info(png_ptr, info_ptr); + + /* Do this the fast way; just read directly out of png_struct. */ + image->width = png_ptr->width; + image->height = png_ptr->height; + + { + png_uint_32 format = png_image_format(png_ptr); + + image->format = format; + +#ifdef PNG_COLORSPACE_SUPPORTED + /* Does the colorspace match sRGB? If there is no color endpoint + * (colorant) information assume yes, otherwise require the + * 'ENDPOINTS_MATCHE_sRGB' colorspace flag to have been set. If the + * colorspace has been determined to be invalid ignore it. + */ + if ((format & PNG_FORMAT_FLAG_COLOR) != 0 && ((png_ptr->colorspace.flags + & (PNG_COLORSPACE_HAVE_ENDPOINTS|PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB| + PNG_COLORSPACE_INVALID)) == PNG_COLORSPACE_HAVE_ENDPOINTS)) + image->flags |= PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB; +#endif + } + + /* We need the maximum number of entries regardless of the format the + * application sets here. + */ + { + png_uint_32 cmap_entries; + + switch (png_ptr->color_type) + { + case PNG_COLOR_TYPE_GRAY: + cmap_entries = 1U << png_ptr->bit_depth; + break; + + case PNG_COLOR_TYPE_PALETTE: + cmap_entries = png_ptr->num_palette; + break; + + default: + cmap_entries = 256; + break; + } + + if (cmap_entries > 256) + cmap_entries = 256; + + image->colormap_entries = cmap_entries; + } + + return 1; +} + +#ifdef PNG_STDIO_SUPPORTED +int PNGAPI +png_image_begin_read_from_stdio(png_imagep image, FILE* file) +{ + if (image != NULL && image->version == PNG_IMAGE_VERSION) + { + if (file != NULL) + { + if (png_image_read_init(image)) + { + /* This is slightly evil, but png_init_io doesn't do anything other + * than this and we haven't changed the standard IO functions so + * this saves a 'safe' function. + */ + image->opaque->png_ptr->io_ptr = file; + return png_safe_execute(image, png_image_read_header, image); + } + } + + else + return png_image_error(image, + "png_image_begin_read_from_stdio: invalid argument"); + } + + else if (image != NULL) + return png_image_error(image, + "png_image_begin_read_from_stdio: incorrect PNG_IMAGE_VERSION"); + + return 0; +} + +int PNGAPI +png_image_begin_read_from_file(png_imagep image, const char *file_name) +{ + if (image != NULL && image->version == PNG_IMAGE_VERSION) + { + if (file_name != NULL) + { + FILE *fp = fopen(file_name, "rb"); + + if (fp != NULL) + { + if (png_image_read_init(image)) + { + image->opaque->png_ptr->io_ptr = fp; + image->opaque->owned_file = 1; + return png_safe_execute(image, png_image_read_header, image); + } + + /* Clean up: just the opened file. */ + (void)fclose(fp); + } + + else + return png_image_error(image, strerror(errno)); + } + + else + return png_image_error(image, + "png_image_begin_read_from_file: invalid argument"); + } + + else if (image != NULL) + return png_image_error(image, + "png_image_begin_read_from_file: incorrect PNG_IMAGE_VERSION"); + + return 0; +} +#endif /* PNG_STDIO_SUPPORTED */ + +static void PNGCBAPI +png_image_memory_read(png_structp png_ptr, png_bytep out, png_size_t need) +{ + if (png_ptr != NULL) + { + png_imagep image = png_voidcast(png_imagep, png_ptr->io_ptr); + if (image != NULL) + { + png_controlp cp = image->opaque; + if (cp != NULL) + { + png_const_bytep memory = cp->memory; + png_size_t size = cp->size; + + if (memory != NULL && size >= need) + { + memcpy(out, memory, need); + cp->memory = memory + need; + cp->size = size - need; + return; + } + + png_error(png_ptr, "read beyond end of data"); + } + } + + png_error(png_ptr, "invalid memory read"); + } +} + +int PNGAPI png_image_begin_read_from_memory(png_imagep image, + png_const_voidp memory, png_size_t size) +{ + if (image != NULL && image->version == PNG_IMAGE_VERSION) + { + if (memory != NULL && size > 0) + { + if (png_image_read_init(image)) + { + /* Now set the IO functions to read from the memory buffer and + * store it into io_ptr. Again do this in-place to avoid calling a + * libpng function that requires error handling. + */ + image->opaque->memory = png_voidcast(png_const_bytep, memory); + image->opaque->size = size; + image->opaque->png_ptr->io_ptr = image; + image->opaque->png_ptr->read_data_fn = png_image_memory_read; + + return png_safe_execute(image, png_image_read_header, image); + } + } + + else + return png_image_error(image, + "png_image_begin_read_from_memory: invalid argument"); + } + + else if (image != NULL) + return png_image_error(image, + "png_image_begin_read_from_memory: incorrect PNG_IMAGE_VERSION"); + + return 0; +} + +/* Utility function to skip chunks that are not used by the simplified image + * read functions and an appropriate macro to call it. + */ +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED +static void +png_image_skip_unused_chunks(png_structrp png_ptr) +{ + /* Prepare the reader to ignore all recognized chunks whose data will not + * be used, i.e., all chunks recognized by libpng except for those + * involved in basic image reading: + * + * IHDR, PLTE, IDAT, IEND + * + * Or image data handling: + * + * tRNS, bKGD, gAMA, cHRM, sRGB, iCCP and sBIT. + * + * This provides a small performance improvement and eliminates any + * potential vulnerability to security problems in the unused chunks. + */ + { + static PNG_CONST png_byte chunks_to_process[] = { + 98, 75, 71, 68, '\0', /* bKGD */ + 99, 72, 82, 77, '\0', /* cHRM */ + 103, 65, 77, 65, '\0', /* gAMA */ + 105, 67, 67, 80, '\0', /* iCCP */ + 115, 66, 73, 84, '\0', /* sBIT */ + 115, 82, 71, 66, '\0', /* sRGB */ + }; + + /* Ignore unknown chunks and all other chunks except for the + * IHDR, PLTE, tRNS, IDAT, and IEND chunks. + */ + png_set_keep_unknown_chunks(png_ptr, PNG_HANDLE_CHUNK_NEVER, + NULL, -1); + + /* But do not ignore image data handling chunks */ + png_set_keep_unknown_chunks(png_ptr, PNG_HANDLE_CHUNK_AS_DEFAULT, + chunks_to_process, (sizeof chunks_to_process)/5); + } +} + +# define PNG_SKIP_CHUNKS(p) png_image_skip_unused_chunks(p) +#else +# define PNG_SKIP_CHUNKS(p) ((void)0) +#endif /* PNG_HANDLE_AS_UNKNOWN_SUPPORTED */ + +/* The following macro gives the exact rounded answer for all values in the + * range 0..255 (it actually divides by 51.2, but the rounding still generates + * the correct numbers 0..5 + */ +#define PNG_DIV51(v8) (((v8) * 5 + 130) >> 8) + +/* Utility functions to make particular color-maps */ +static void +set_file_encoding(png_image_read_control *display) +{ + png_fixed_point g = display->image->opaque->png_ptr->colorspace.gamma; + if (png_gamma_significant(g)) + { + if (png_gamma_not_sRGB(g)) + { + display->file_encoding = E_FILE; + display->gamma_to_linear = png_reciprocal(g); + } + + else + display->file_encoding = E_sRGB; + } + + else + display->file_encoding = E_LINEAR8; +} + +static unsigned int +decode_gamma(png_image_read_control *display, png_uint_32 value, int encoding) +{ + if (encoding == E_FILE) /* double check */ + encoding = display->file_encoding; + + if (encoding == E_NOTSET) /* must be the file encoding */ + { + set_file_encoding(display); + encoding = display->file_encoding; + } + + switch (encoding) + { + case E_FILE: + value = png_gamma_16bit_correct(value*257, display->gamma_to_linear); + break; + + case E_sRGB: + value = png_sRGB_table[value]; + break; + + case E_LINEAR: + break; + + case E_LINEAR8: + value *= 257; + break; + + default: + png_error(display->image->opaque->png_ptr, + "unexpected encoding (internal error)"); + break; + } + + return value; +} + +static png_uint_32 +png_colormap_compose(png_image_read_control *display, + png_uint_32 foreground, int foreground_encoding, png_uint_32 alpha, + png_uint_32 background, int encoding) +{ + /* The file value is composed on the background, the background has the given + * encoding and so does the result, the file is encoded with E_FILE and the + * file and alpha are 8-bit values. The (output) encoding will always be + * E_LINEAR or E_sRGB. + */ + png_uint_32 f = decode_gamma(display, foreground, foreground_encoding); + png_uint_32 b = decode_gamma(display, background, encoding); + + /* The alpha is always an 8-bit value (it comes from the palette), the value + * scaled by 255 is what PNG_sRGB_FROM_LINEAR requires. + */ + f = f * alpha + b * (255-alpha); + + if (encoding == E_LINEAR) + { + /* Scale to 65535; divide by 255, approximately (in fact this is extremely + * accurate, it divides by 255.00000005937181414556, with no overflow.) + */ + f *= 257; /* Now scaled by 65535 */ + f += f >> 16; + f = (f+32768) >> 16; + } + + else /* E_sRGB */ + f = PNG_sRGB_FROM_LINEAR(f); + + return f; +} + +/* NOTE: E_LINEAR values to this routine must be 16-bit, but E_FILE values must + * be 8-bit. + */ +static void +png_create_colormap_entry(png_image_read_control *display, + png_uint_32 ip, png_uint_32 red, png_uint_32 green, png_uint_32 blue, + png_uint_32 alpha, int encoding) +{ + png_imagep image = display->image; + const int output_encoding = (image->format & PNG_FORMAT_FLAG_LINEAR) ? + E_LINEAR : E_sRGB; + const int convert_to_Y = (image->format & PNG_FORMAT_FLAG_COLOR) == 0 && + (red != green || green != blue); + + if (ip > 255) + png_error(image->opaque->png_ptr, "color-map index out of range"); + + /* Update the cache with whether the file gamma is significantly different + * from sRGB. + */ + if (encoding == E_FILE) + { + if (display->file_encoding == E_NOTSET) + set_file_encoding(display); + + /* Note that the cached value may be E_FILE too, but if it is then the + * gamma_to_linear member has been set. + */ + encoding = display->file_encoding; + } + + if (encoding == E_FILE) + { + png_fixed_point g = display->gamma_to_linear; + + red = png_gamma_16bit_correct(red*257, g); + green = png_gamma_16bit_correct(green*257, g); + blue = png_gamma_16bit_correct(blue*257, g); + + if (convert_to_Y || output_encoding == E_LINEAR) + { + alpha *= 257; + encoding = E_LINEAR; + } + + else + { + red = PNG_sRGB_FROM_LINEAR(red * 255); + green = PNG_sRGB_FROM_LINEAR(green * 255); + blue = PNG_sRGB_FROM_LINEAR(blue * 255); + encoding = E_sRGB; + } + } + + else if (encoding == E_LINEAR8) + { + /* This encoding occurs quite frequently in test cases because PngSuite + * includes a gAMA 1.0 chunk with most images. + */ + red *= 257; + green *= 257; + blue *= 257; + alpha *= 257; + encoding = E_LINEAR; + } + + else if (encoding == E_sRGB && (convert_to_Y || output_encoding == E_LINEAR)) + { + /* The values are 8-bit sRGB values, but must be converted to 16-bit + * linear. + */ + red = png_sRGB_table[red]; + green = png_sRGB_table[green]; + blue = png_sRGB_table[blue]; + alpha *= 257; + encoding = E_LINEAR; + } + + /* This is set if the color isn't gray but the output is. */ + if (encoding == E_LINEAR) + { + if (convert_to_Y) + { + /* NOTE: these values are copied from png_do_rgb_to_gray */ + png_uint_32 y = (png_uint_32)6968 * red + (png_uint_32)23434 * green + + (png_uint_32)2366 * blue; + + if (output_encoding == E_LINEAR) + y = (y + 16384) >> 15; + + else + { + /* y is scaled by 32768, we need it scaled by 255: */ + y = (y + 128) >> 8; + y *= 255; + y = PNG_sRGB_FROM_LINEAR((y + 64) >> 7); + encoding = E_sRGB; + } + + blue = red = green = y; + } + + else if (output_encoding == E_sRGB) + { + red = PNG_sRGB_FROM_LINEAR(red * 255); + green = PNG_sRGB_FROM_LINEAR(green * 255); + blue = PNG_sRGB_FROM_LINEAR(blue * 255); + alpha = PNG_DIV257(alpha); + encoding = E_sRGB; + } + } + + if (encoding != output_encoding) + png_error(image->opaque->png_ptr, "bad encoding (internal error)"); + + /* Store the value. */ + { +# ifdef PNG_FORMAT_BGR_SUPPORTED + const int afirst = (image->format & PNG_FORMAT_FLAG_AFIRST) != 0 && + (image->format & PNG_FORMAT_FLAG_ALPHA) != 0; +# else +# define afirst 0 +# endif +# ifdef PNG_FORMAT_BGR_SUPPORTED + const int bgr = (image->format & PNG_FORMAT_FLAG_BGR) ? 2 : 0; +# else +# define bgr 0 +# endif + + if (output_encoding == E_LINEAR) + { + png_uint_16p entry = png_voidcast(png_uint_16p, display->colormap); + + entry += ip * PNG_IMAGE_SAMPLE_CHANNELS(image->format); + + /* The linear 16-bit values must be pre-multiplied by the alpha channel + * value, if less than 65535 (this is, effectively, composite on black + * if the alpha channel is removed.) + */ + switch (PNG_IMAGE_SAMPLE_CHANNELS(image->format)) + { + case 4: + entry[afirst ? 0 : 3] = (png_uint_16)alpha; + /* FALL THROUGH */ + + case 3: + if (alpha < 65535) + { + if (alpha > 0) + { + blue = (blue * alpha + 32767U)/65535U; + green = (green * alpha + 32767U)/65535U; + red = (red * alpha + 32767U)/65535U; + } + + else + red = green = blue = 0; + } + entry[afirst + (2 ^ bgr)] = (png_uint_16)blue; + entry[afirst + 1] = (png_uint_16)green; + entry[afirst + bgr] = (png_uint_16)red; + break; + + case 2: + entry[1 ^ afirst] = (png_uint_16)alpha; + /* FALL THROUGH */ + + case 1: + if (alpha < 65535) + { + if (alpha > 0) + green = (green * alpha + 32767U)/65535U; + + else + green = 0; + } + entry[afirst] = (png_uint_16)green; + break; + + default: + break; + } + } + + else /* output encoding is E_sRGB */ + { + png_bytep entry = png_voidcast(png_bytep, display->colormap); + + entry += ip * PNG_IMAGE_SAMPLE_CHANNELS(image->format); + + switch (PNG_IMAGE_SAMPLE_CHANNELS(image->format)) + { + case 4: + entry[afirst ? 0 : 3] = (png_byte)alpha; + case 3: + entry[afirst + (2 ^ bgr)] = (png_byte)blue; + entry[afirst + 1] = (png_byte)green; + entry[afirst + bgr] = (png_byte)red; + break; + + case 2: + entry[1 ^ afirst] = (png_byte)alpha; + case 1: + entry[afirst] = (png_byte)green; + break; + + default: + break; + } + } + +# ifdef afirst +# undef afirst +# endif +# ifdef bgr +# undef bgr +# endif + } +} + +static int +make_gray_file_colormap(png_image_read_control *display) +{ + unsigned int i; + + for (i=0; i<256; ++i) + png_create_colormap_entry(display, i, i, i, i, 255, E_FILE); + + return i; +} + +static int +make_gray_colormap(png_image_read_control *display) +{ + unsigned int i; + + for (i=0; i<256; ++i) + png_create_colormap_entry(display, i, i, i, i, 255, E_sRGB); + + return i; +} +#define PNG_GRAY_COLORMAP_ENTRIES 256 + +static int +make_ga_colormap(png_image_read_control *display) +{ + unsigned int i, a; + + /* Alpha is retained, the output will be a color-map with entries + * selected by six levels of alpha. One transparent entry, 6 gray + * levels for all the intermediate alpha values, leaving 230 entries + * for the opaque grays. The color-map entries are the six values + * [0..5]*51, the GA processing uses PNG_DIV51(value) to find the + * relevant entry. + * + * if (alpha > 229) // opaque + * { + * // The 231 entries are selected to make the math below work: + * base = 0; + * entry = (231 * gray + 128) >> 8; + * } + * else if (alpha < 26) // transparent + * { + * base = 231; + * entry = 0; + * } + * else // partially opaque + * { + * base = 226 + 6 * PNG_DIV51(alpha); + * entry = PNG_DIV51(gray); + * } + */ + i = 0; + while (i < 231) + { + unsigned int gray = (i * 256 + 115) / 231; + png_create_colormap_entry(display, i++, gray, gray, gray, 255, E_sRGB); + } + + /* 255 is used here for the component values for consistency with the code + * that undoes premultiplication in pngwrite.c. + */ + png_create_colormap_entry(display, i++, 255, 255, 255, 0, E_sRGB); + + for (a=1; a<5; ++a) + { + unsigned int g; + + for (g=0; g<6; ++g) + png_create_colormap_entry(display, i++, g*51, g*51, g*51, a*51, + E_sRGB); + } + + return i; +} + +#define PNG_GA_COLORMAP_ENTRIES 256 + +static int +make_rgb_colormap(png_image_read_control *display) +{ + unsigned int i, r; + + /* Build a 6x6x6 opaque RGB cube */ + for (i=r=0; r<6; ++r) + { + unsigned int g; + + for (g=0; g<6; ++g) + { + unsigned int b; + + for (b=0; b<6; ++b) + png_create_colormap_entry(display, i++, r*51, g*51, b*51, 255, + E_sRGB); + } + } + + return i; +} + +#define PNG_RGB_COLORMAP_ENTRIES 216 + +/* Return a palette index to the above palette given three 8-bit sRGB values. */ +#define PNG_RGB_INDEX(r,g,b) \ + ((png_byte)(6 * (6 * PNG_DIV51(r) + PNG_DIV51(g)) + PNG_DIV51(b))) + +static int +png_image_read_colormap(png_voidp argument) +{ + png_image_read_control *display = + png_voidcast(png_image_read_control*, argument); + const png_imagep image = display->image; + + const png_structrp png_ptr = image->opaque->png_ptr; + const png_uint_32 output_format = image->format; + const int output_encoding = (output_format & PNG_FORMAT_FLAG_LINEAR) ? + E_LINEAR : E_sRGB; + + unsigned int cmap_entries; + unsigned int output_processing; /* Output processing option */ + unsigned int data_encoding = E_NOTSET; /* Encoding libpng must produce */ + + /* Background information; the background color and the index of this color + * in the color-map if it exists (else 256). + */ + unsigned int background_index = 256; + png_uint_32 back_r, back_g, back_b; + + /* Flags to accumulate things that need to be done to the input. */ + int expand_tRNS = 0; + + /* Exclude the NYI feature of compositing onto a color-mapped buffer; it is + * very difficult to do, the results look awful, and it is difficult to see + * what possible use it is because the application can't control the + * color-map. + */ + if (((png_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0 || + png_ptr->num_trans > 0) /* alpha in input */ && + ((output_format & PNG_FORMAT_FLAG_ALPHA) == 0) /* no alpha in output */) + { + if (output_encoding == E_LINEAR) /* compose on black */ + back_b = back_g = back_r = 0; + + else if (display->background == NULL /* no way to remove it */) + png_error(png_ptr, + "a background color must be supplied to remove alpha/transparency"); + + /* Get a copy of the background color (this avoids repeating the checks + * below.) The encoding is 8-bit sRGB or 16-bit linear, depending on the + * output format. + */ + else + { + back_g = display->background->green; + if (output_format & PNG_FORMAT_FLAG_COLOR) + { + back_r = display->background->red; + back_b = display->background->blue; + } + else + back_b = back_r = back_g; + } + } + + else if (output_encoding == E_LINEAR) + back_b = back_r = back_g = 65535; + + else + back_b = back_r = back_g = 255; + + /* Default the input file gamma if required - this is necessary because + * libpng assumes that if no gamma information is present the data is in the + * output format, but the simplified API deduces the gamma from the input + * format. + */ + if ((png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) == 0) + { + /* Do this directly, not using the png_colorspace functions, to ensure + * that it happens even if the colorspace is invalid (though probably if + * it is the setting will be ignored) Note that the same thing can be + * achieved at the application interface with png_set_gAMA. + */ + if (png_ptr->bit_depth == 16 && + (image->flags & PNG_IMAGE_FLAG_16BIT_sRGB) == 0) + png_ptr->colorspace.gamma = PNG_GAMMA_LINEAR; + + else + png_ptr->colorspace.gamma = PNG_GAMMA_sRGB_INVERSE; + + png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA; + } + + /* Decide what to do based on the PNG color type of the input data. The + * utility function png_create_colormap_entry deals with most aspects of the + * output transformations; this code works out how to produce bytes of + * color-map entries from the original format. + */ + switch (png_ptr->color_type) + { + case PNG_COLOR_TYPE_GRAY: + if (png_ptr->bit_depth <= 8) + { + /* There at most 256 colors in the output, regardless of + * transparency. + */ + unsigned int step, i, val, trans = 256/*ignore*/, back_alpha = 0; + + cmap_entries = 1U << png_ptr->bit_depth; + if (cmap_entries > image->colormap_entries) + png_error(png_ptr, "gray[8] color-map: too few entries"); + + step = 255 / (cmap_entries - 1); + output_processing = PNG_CMAP_NONE; + + /* If there is a tRNS chunk then this either selects a transparent + * value or, if the output has no alpha, the background color. + */ + if (png_ptr->num_trans > 0) + { + trans = png_ptr->trans_color.gray; + + if ((output_format & PNG_FORMAT_FLAG_ALPHA) == 0) + back_alpha = output_encoding == E_LINEAR ? 65535 : 255; + } + + /* png_create_colormap_entry just takes an RGBA and writes the + * corresponding color-map entry using the format from 'image', + * including the required conversion to sRGB or linear as + * appropriate. The input values are always either sRGB (if the + * gamma correction flag is 0) or 0..255 scaled file encoded values + * (if the function must gamma correct them). + */ + for (i=val=0; ibit_depth < 8) + png_set_packing(png_ptr); + } + + else /* bit depth is 16 */ + { + /* The 16-bit input values can be converted directly to 8-bit gamma + * encoded values; however, if a tRNS chunk is present 257 color-map + * entries are required. This means that the extra entry requires + * special processing; add an alpha channel, sacrifice gray level + * 254 and convert transparent (alpha==0) entries to that. + * + * Use libpng to chop the data to 8 bits. Convert it to sRGB at the + * same time to minimize quality loss. If a tRNS chunk is present + * this means libpng must handle it too; otherwise it is impossible + * to do the exact match on the 16-bit value. + * + * If the output has no alpha channel *and* the background color is + * gray then it is possible to let libpng handle the substitution by + * ensuring that the corresponding gray level matches the background + * color exactly. + */ + data_encoding = E_sRGB; + + if (PNG_GRAY_COLORMAP_ENTRIES > image->colormap_entries) + png_error(png_ptr, "gray[16] color-map: too few entries"); + + cmap_entries = make_gray_colormap(display); + + if (png_ptr->num_trans > 0) + { + unsigned int back_alpha; + + if (output_format & PNG_FORMAT_FLAG_ALPHA) + back_alpha = 0; + + else + { + if (back_r == back_g && back_g == back_b) + { + /* Background is gray; no special processing will be + * required. + */ + png_color_16 c; + png_uint_32 gray = back_g; + + if (output_encoding == E_LINEAR) + { + gray = PNG_sRGB_FROM_LINEAR(gray * 255); + + /* And make sure the corresponding palette entry + * matches. + */ + png_create_colormap_entry(display, gray, back_g, back_g, + back_g, 65535, E_LINEAR); + } + + /* The background passed to libpng, however, must be the + * sRGB value. + */ + c.index = 0; /*unused*/ + c.gray = c.red = c.green = c.blue = (png_uint_16)gray; + + /* NOTE: does this work without expanding tRNS to alpha? + * It should be the color->gray case below apparently + * doesn't. + */ + png_set_background_fixed(png_ptr, &c, + PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/, + 0/*gamma: not used*/); + + output_processing = PNG_CMAP_NONE; + break; + } + + back_alpha = output_encoding == E_LINEAR ? 65535 : 255; + } + + /* output_processing means that the libpng-processed row will be + * 8-bit GA and it has to be processing to single byte color-map + * values. Entry 254 is replaced by either a completely + * transparent entry or by the background color at full + * precision (and the background color is not a simple gray leve + * in this case.) + */ + expand_tRNS = 1; + output_processing = PNG_CMAP_TRANS; + background_index = 254; + + /* And set (overwrite) color-map entry 254 to the actual + * background color at full precision. + */ + png_create_colormap_entry(display, 254, back_r, back_g, back_b, + back_alpha, output_encoding); + } + + else + output_processing = PNG_CMAP_NONE; + } + break; + + case PNG_COLOR_TYPE_GRAY_ALPHA: + /* 8-bit or 16-bit PNG with two channels - gray and alpha. A minimum + * of 65536 combinations. If, however, the alpha channel is to be + * removed there are only 256 possibilities if the background is gray. + * (Otherwise there is a subset of the 65536 possibilities defined by + * the triangle between black, white and the background color.) + * + * Reduce 16-bit files to 8-bit and sRGB encode the result. No need to + * worry about tRNS matching - tRNS is ignored if there is an alpha + * channel. + */ + data_encoding = E_sRGB; + + if (output_format & PNG_FORMAT_FLAG_ALPHA) + { + if (PNG_GA_COLORMAP_ENTRIES > image->colormap_entries) + png_error(png_ptr, "gray+alpha color-map: too few entries"); + + cmap_entries = make_ga_colormap(display); + + background_index = PNG_CMAP_GA_BACKGROUND; + output_processing = PNG_CMAP_GA; + } + + else /* alpha is removed */ + { + /* Alpha must be removed as the PNG data is processed when the + * background is a color because the G and A channels are + * independent and the vector addition (non-parallel vectors) is a + * 2-D problem. + * + * This can be reduced to the same algorithm as above by making a + * colormap containing gray levels (for the opaque grays), a + * background entry (for a transparent pixel) and a set of four six + * level color values, one set for each intermediate alpha value. + * See the comments in make_ga_colormap for how this works in the + * per-pixel processing. + * + * If the background is gray, however, we only need a 256 entry gray + * level color map. It is sufficient to make the entry generated + * for the background color be exactly the color specified. + */ + if ((output_format & PNG_FORMAT_FLAG_COLOR) == 0 || + (back_r == back_g && back_g == back_b)) + { + /* Background is gray; no special processing will be required. */ + png_color_16 c; + png_uint_32 gray = back_g; + + if (PNG_GRAY_COLORMAP_ENTRIES > image->colormap_entries) + png_error(png_ptr, "gray-alpha color-map: too few entries"); + + cmap_entries = make_gray_colormap(display); + + if (output_encoding == E_LINEAR) + { + gray = PNG_sRGB_FROM_LINEAR(gray * 255); + + /* And make sure the corresponding palette entry matches. */ + png_create_colormap_entry(display, gray, back_g, back_g, + back_g, 65535, E_LINEAR); + } + + /* The background passed to libpng, however, must be the sRGB + * value. + */ + c.index = 0; /*unused*/ + c.gray = c.red = c.green = c.blue = (png_uint_16)gray; + + png_set_background_fixed(png_ptr, &c, + PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/, + 0/*gamma: not used*/); + + output_processing = PNG_CMAP_NONE; + } + + else + { + png_uint_32 i, a; + + /* This is the same as png_make_ga_colormap, above, except that + * the entries are all opaque. + */ + if (PNG_GA_COLORMAP_ENTRIES > image->colormap_entries) + png_error(png_ptr, "ga-alpha color-map: too few entries"); + + i = 0; + while (i < 231) + { + png_uint_32 gray = (i * 256 + 115) / 231; + png_create_colormap_entry(display, i++, gray, gray, gray, + 255, E_sRGB); + } + + /* NOTE: this preserves the full precision of the application + * background color. + */ + background_index = i; + png_create_colormap_entry(display, i++, back_r, back_g, back_b, + output_encoding == E_LINEAR ? 65535U : 255U, output_encoding); + + /* For non-opaque input composite on the sRGB background - this + * requires inverting the encoding for each component. The input + * is still converted to the sRGB encoding because this is a + * reasonable approximate to the logarithmic curve of human + * visual sensitivity, at least over the narrow range which PNG + * represents. Consequently 'G' is always sRGB encoded, while + * 'A' is linear. We need the linear background colors. + */ + if (output_encoding == E_sRGB) /* else already linear */ + { + /* This may produce a value not exactly matching the + * background, but that's ok because these numbers are only + * used when alpha != 0 + */ + back_r = png_sRGB_table[back_r]; + back_g = png_sRGB_table[back_g]; + back_b = png_sRGB_table[back_b]; + } + + for (a=1; a<5; ++a) + { + unsigned int g; + + /* PNG_sRGB_FROM_LINEAR expects a 16-bit linear value scaled + * by an 8-bit alpha value (0..255). + */ + png_uint_32 alpha = 51 * a; + png_uint_32 back_rx = (255-alpha) * back_r; + png_uint_32 back_gx = (255-alpha) * back_g; + png_uint_32 back_bx = (255-alpha) * back_b; + + for (g=0; g<6; ++g) + { + png_uint_32 gray = png_sRGB_table[g*51] * alpha; + + png_create_colormap_entry(display, i++, + PNG_sRGB_FROM_LINEAR(gray + back_rx), + PNG_sRGB_FROM_LINEAR(gray + back_gx), + PNG_sRGB_FROM_LINEAR(gray + back_bx), 255, E_sRGB); + } + } + + cmap_entries = i; + output_processing = PNG_CMAP_GA; + } + } + break; + + case PNG_COLOR_TYPE_RGB: + case PNG_COLOR_TYPE_RGB_ALPHA: + /* Exclude the case where the output is gray; we can always handle this + * with the cases above. + */ + if ((output_format & PNG_FORMAT_FLAG_COLOR) == 0) + { + /* The color-map will be grayscale, so we may as well convert the + * input RGB values to a simple grayscale and use the grayscale + * code above. + * + * NOTE: calling this apparently damages the recognition of the + * transparent color in background color handling; call + * png_set_tRNS_to_alpha before png_set_background_fixed. + */ + png_set_rgb_to_gray_fixed(png_ptr, PNG_ERROR_ACTION_NONE, -1, + -1); + data_encoding = E_sRGB; + + /* The output will now be one or two 8-bit gray or gray+alpha + * channels. The more complex case arises when the input has alpha. + */ + if ((png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA || + png_ptr->num_trans > 0) && + (output_format & PNG_FORMAT_FLAG_ALPHA) != 0) + { + /* Both input and output have an alpha channel, so no background + * processing is required; just map the GA bytes to the right + * color-map entry. + */ + expand_tRNS = 1; + + if (PNG_GA_COLORMAP_ENTRIES > image->colormap_entries) + png_error(png_ptr, "rgb[ga] color-map: too few entries"); + + cmap_entries = make_ga_colormap(display); + background_index = PNG_CMAP_GA_BACKGROUND; + output_processing = PNG_CMAP_GA; + } + + else + { + /* Either the input or the output has no alpha channel, so there + * will be no non-opaque pixels in the color-map; it will just be + * grayscale. + */ + if (PNG_GRAY_COLORMAP_ENTRIES > image->colormap_entries) + png_error(png_ptr, "rgb[gray] color-map: too few entries"); + + /* Ideally this code would use libpng to do the gamma correction, + * but if an input alpha channel is to be removed we will hit the + * libpng bug in gamma+compose+rgb-to-gray (the double gamma + * correction bug). Fix this by dropping the gamma correction in + * this case and doing it in the palette; this will result in + * duplicate palette entries, but that's better than the + * alternative of double gamma correction. + */ + if ((png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA || + png_ptr->num_trans > 0) && + png_gamma_not_sRGB(png_ptr->colorspace.gamma)) + { + cmap_entries = make_gray_file_colormap(display); + data_encoding = E_FILE; + } + + else + cmap_entries = make_gray_colormap(display); + + /* But if the input has alpha or transparency it must be removed + */ + if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA || + png_ptr->num_trans > 0) + { + png_color_16 c; + png_uint_32 gray = back_g; + + /* We need to ensure that the application background exists in + * the colormap and that completely transparent pixels map to + * it. Achieve this simply by ensuring that the entry + * selected for the background really is the background color. + */ + if (data_encoding == E_FILE) /* from the fixup above */ + { + /* The app supplied a gray which is in output_encoding, we + * need to convert it to a value of the input (E_FILE) + * encoding then set this palette entry to the required + * output encoding. + */ + if (output_encoding == E_sRGB) + gray = png_sRGB_table[gray]; /* now E_LINEAR */ + + gray = PNG_DIV257(png_gamma_16bit_correct(gray, + png_ptr->colorspace.gamma)); /* now E_FILE */ + + /* And make sure the corresponding palette entry contains + * exactly the required sRGB value. + */ + png_create_colormap_entry(display, gray, back_g, back_g, + back_g, 0/*unused*/, output_encoding); + } + + else if (output_encoding == E_LINEAR) + { + gray = PNG_sRGB_FROM_LINEAR(gray * 255); + + /* And make sure the corresponding palette entry matches. + */ + png_create_colormap_entry(display, gray, back_g, back_g, + back_g, 0/*unused*/, E_LINEAR); + } + + /* The background passed to libpng, however, must be the + * output (normally sRGB) value. + */ + c.index = 0; /*unused*/ + c.gray = c.red = c.green = c.blue = (png_uint_16)gray; + + /* NOTE: the following is apparently a bug in libpng. Without + * it the transparent color recognition in + * png_set_background_fixed seems to go wrong. + */ + expand_tRNS = 1; + png_set_background_fixed(png_ptr, &c, + PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/, + 0/*gamma: not used*/); + } + + output_processing = PNG_CMAP_NONE; + } + } + + else /* output is color */ + { + /* We could use png_quantize here so long as there is no transparent + * color or alpha; png_quantize ignores alpha. Easier overall just + * to do it once and using PNG_DIV51 on the 6x6x6 reduced RGB cube. + * Consequently we always want libpng to produce sRGB data. + */ + data_encoding = E_sRGB; + + /* Is there any transparency or alpha? */ + if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA || + png_ptr->num_trans > 0) + { + /* Is there alpha in the output too? If so all four channels are + * processed into a special RGB cube with alpha support. + */ + if (output_format & PNG_FORMAT_FLAG_ALPHA) + { + png_uint_32 r; + + if (PNG_RGB_COLORMAP_ENTRIES+1+27 > image->colormap_entries) + png_error(png_ptr, "rgb+alpha color-map: too few entries"); + + cmap_entries = make_rgb_colormap(display); + + /* Add a transparent entry. */ + png_create_colormap_entry(display, cmap_entries, 255, 255, + 255, 0, E_sRGB); + + /* This is stored as the background index for the processing + * algorithm. + */ + background_index = cmap_entries++; + + /* Add 27 r,g,b entries each with alpha 0.5. */ + for (r=0; r<256; r = (r << 1) | 0x7f) + { + png_uint_32 g; + + for (g=0; g<256; g = (g << 1) | 0x7f) + { + png_uint_32 b; + + /* This generates components with the values 0, 127 and + * 255 + */ + for (b=0; b<256; b = (b << 1) | 0x7f) + png_create_colormap_entry(display, cmap_entries++, + r, g, b, 128, E_sRGB); + } + } + + expand_tRNS = 1; + output_processing = PNG_CMAP_RGB_ALPHA; + } + + else + { + /* Alpha/transparency must be removed. The background must + * exist in the color map (achieved by setting adding it after + * the 666 color-map). If the standard processing code will + * pick up this entry automatically that's all that is + * required; libpng can be called to do the background + * processing. + */ + unsigned int sample_size = + PNG_IMAGE_SAMPLE_SIZE(output_format); + png_uint_32 r, g, b; /* sRGB background */ + + if (PNG_RGB_COLORMAP_ENTRIES+1+27 > image->colormap_entries) + png_error(png_ptr, "rgb-alpha color-map: too few entries"); + + cmap_entries = make_rgb_colormap(display); + + png_create_colormap_entry(display, cmap_entries, back_r, + back_g, back_b, 0/*unused*/, output_encoding); + + if (output_encoding == E_LINEAR) + { + r = PNG_sRGB_FROM_LINEAR(back_r * 255); + g = PNG_sRGB_FROM_LINEAR(back_g * 255); + b = PNG_sRGB_FROM_LINEAR(back_b * 255); + } + + else + { + r = back_r; + g = back_g; + b = back_g; + } + + /* Compare the newly-created color-map entry with the one the + * PNG_CMAP_RGB algorithm will use. If the two entries don't + * match, add the new one and set this as the background + * index. + */ + if (memcmp((png_const_bytep)display->colormap + + sample_size * cmap_entries, + (png_const_bytep)display->colormap + + sample_size * PNG_RGB_INDEX(r,g,b), + sample_size) != 0) + { + /* The background color must be added. */ + background_index = cmap_entries++; + + /* Add 27 r,g,b entries each with created by composing with + * the background at alpha 0.5. + */ + for (r=0; r<256; r = (r << 1) | 0x7f) + { + for (g=0; g<256; g = (g << 1) | 0x7f) + { + /* This generates components with the values 0, 127 + * and 255 + */ + for (b=0; b<256; b = (b << 1) | 0x7f) + png_create_colormap_entry(display, cmap_entries++, + png_colormap_compose(display, r, E_sRGB, 128, + back_r, output_encoding), + png_colormap_compose(display, g, E_sRGB, 128, + back_g, output_encoding), + png_colormap_compose(display, b, E_sRGB, 128, + back_b, output_encoding), + 0/*unused*/, output_encoding); + } + } + + expand_tRNS = 1; + output_processing = PNG_CMAP_RGB_ALPHA; + } + + else /* background color is in the standard color-map */ + { + png_color_16 c; + + c.index = 0; /*unused*/ + c.red = (png_uint_16)back_r; + c.gray = c.green = (png_uint_16)back_g; + c.blue = (png_uint_16)back_b; + + png_set_background_fixed(png_ptr, &c, + PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/, + 0/*gamma: not used*/); + + output_processing = PNG_CMAP_RGB; + } + } + } + + else /* no alpha or transparency in the input */ + { + /* Alpha in the output is irrelevant, simply map the opaque input + * pixels to the 6x6x6 color-map. + */ + if (PNG_RGB_COLORMAP_ENTRIES > image->colormap_entries) + png_error(png_ptr, "rgb color-map: too few entries"); + + cmap_entries = make_rgb_colormap(display); + output_processing = PNG_CMAP_RGB; + } + } + break; + + case PNG_COLOR_TYPE_PALETTE: + /* It's already got a color-map. It may be necessary to eliminate the + * tRNS entries though. + */ + { + unsigned int num_trans = png_ptr->num_trans; + png_const_bytep trans = num_trans > 0 ? png_ptr->trans_alpha : NULL; + png_const_colorp colormap = png_ptr->palette; + const int do_background = trans != NULL && + (output_format & PNG_FORMAT_FLAG_ALPHA) == 0; + unsigned int i; + + /* Just in case: */ + if (trans == NULL) + num_trans = 0; + + output_processing = PNG_CMAP_NONE; + data_encoding = E_FILE; /* Don't change from color-map indicies */ + cmap_entries = png_ptr->num_palette; + if (cmap_entries > 256) + cmap_entries = 256; + + if (cmap_entries > image->colormap_entries) + png_error(png_ptr, "palette color-map: too few entries"); + + for (i=0; i < cmap_entries; ++i) + { + if (do_background && i < num_trans && trans[i] < 255) + { + if (trans[i] == 0) + png_create_colormap_entry(display, i, back_r, back_g, + back_b, 0, output_encoding); + + else + { + /* Must compose the PNG file color in the color-map entry + * on the sRGB color in 'back'. + */ + png_create_colormap_entry(display, i, + png_colormap_compose(display, colormap[i].red, E_FILE, + trans[i], back_r, output_encoding), + png_colormap_compose(display, colormap[i].green, E_FILE, + trans[i], back_g, output_encoding), + png_colormap_compose(display, colormap[i].blue, E_FILE, + trans[i], back_b, output_encoding), + output_encoding == E_LINEAR ? trans[i] * 257U : + trans[i], + output_encoding); + } + } + + else + png_create_colormap_entry(display, i, colormap[i].red, + colormap[i].green, colormap[i].blue, + i < num_trans ? trans[i] : 255U, E_FILE/*8-bit*/); + } + + /* The PNG data may have indicies packed in fewer than 8 bits, it + * must be expanded if so. + */ + if (png_ptr->bit_depth < 8) + png_set_packing(png_ptr); + } + break; + + default: + png_error(png_ptr, "invalid PNG color type"); + /*NOT REACHED*/ + break; + } + + /* Now deal with the output processing */ + if (expand_tRNS && png_ptr->num_trans > 0 && + (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) == 0) + png_set_tRNS_to_alpha(png_ptr); + + switch (data_encoding) + { + default: + png_error(png_ptr, "bad data option (internal error)"); + break; + + case E_sRGB: + /* Change to 8-bit sRGB */ + png_set_alpha_mode_fixed(png_ptr, PNG_ALPHA_PNG, PNG_GAMMA_sRGB); + /* FALL THROUGH */ + + case E_FILE: + if (png_ptr->bit_depth > 8) + png_set_scale_16(png_ptr); + break; + } + + if (cmap_entries > 256 || cmap_entries > image->colormap_entries) + png_error(png_ptr, "color map overflow (BAD internal error)"); + + image->colormap_entries = cmap_entries; + + /* Double check using the recorded background index */ + switch (output_processing) + { + case PNG_CMAP_NONE: + if (background_index != PNG_CMAP_NONE_BACKGROUND) + goto bad_background; + break; + + case PNG_CMAP_GA: + if (background_index != PNG_CMAP_GA_BACKGROUND) + goto bad_background; + break; + + case PNG_CMAP_TRANS: + if (background_index >= cmap_entries || + background_index != PNG_CMAP_TRANS_BACKGROUND) + goto bad_background; + break; + + case PNG_CMAP_RGB: + if (background_index != PNG_CMAP_RGB_BACKGROUND) + goto bad_background; + break; + + case PNG_CMAP_RGB_ALPHA: + if (background_index != PNG_CMAP_RGB_ALPHA_BACKGROUND) + goto bad_background; + break; + + default: + png_error(png_ptr, "bad processing option (internal error)"); + + bad_background: + png_error(png_ptr, "bad background index (internal error)"); + } + + display->colormap_processing = output_processing; + + return 1/*ok*/; +} + +/* The final part of the color-map read called from png_image_finish_read. */ +static int +png_image_read_and_map(png_voidp argument) +{ + png_image_read_control *display = png_voidcast(png_image_read_control*, + argument); + png_imagep image = display->image; + png_structrp png_ptr = image->opaque->png_ptr; + int passes; + + /* Called when the libpng data must be transformed into the color-mapped + * form. There is a local row buffer in display->local and this routine must + * do the interlace handling. + */ + switch (png_ptr->interlaced) + { + case PNG_INTERLACE_NONE: + passes = 1; + break; + + case PNG_INTERLACE_ADAM7: + passes = PNG_INTERLACE_ADAM7_PASSES; + break; + + default: + passes = 0; + png_error(png_ptr, "unknown interlace type"); + } + + { + png_uint_32 height = image->height; + png_uint_32 width = image->width; + int proc = display->colormap_processing; + png_bytep first_row = png_voidcast(png_bytep, display->first_row); + ptrdiff_t step_row = display->row_bytes; + int pass; + + for (pass = 0; pass < passes; ++pass) + { + unsigned int startx, stepx, stepy; + png_uint_32 y; + + if (png_ptr->interlaced == PNG_INTERLACE_ADAM7) + { + /* The row may be empty for a short image: */ + if (PNG_PASS_COLS(width, pass) == 0) + continue; + + startx = PNG_PASS_START_COL(pass); + stepx = PNG_PASS_COL_OFFSET(pass); + y = PNG_PASS_START_ROW(pass); + stepy = PNG_PASS_ROW_OFFSET(pass); + } + + else + { + y = 0; + startx = 0; + stepx = stepy = 1; + } + + for (; ylocal_row); + png_bytep outrow = first_row + y * step_row; + png_const_bytep end_row = outrow + width; + + /* Read read the libpng data into the temporary buffer. */ + png_read_row(png_ptr, inrow, NULL); + + /* Now process the row according to the processing option, note + * that the caller verifies that the format of the libpng output + * data is as required. + */ + outrow += startx; + switch (proc) + { + case PNG_CMAP_GA: + for (; outrow < end_row; outrow += stepx) + { + /* The data is always in the PNG order */ + unsigned int gray = *inrow++; + unsigned int alpha = *inrow++; + unsigned int entry; + + /* NOTE: this code is copied as a comment in + * make_ga_colormap above. Please update the + * comment if you change this code! + */ + if (alpha > 229) /* opaque */ + { + entry = (231 * gray + 128) >> 8; + } + else if (alpha < 26) /* transparent */ + { + entry = 231; + } + else /* partially opaque */ + { + entry = 226 + 6 * PNG_DIV51(alpha) + PNG_DIV51(gray); + } + + *outrow = (png_byte)entry; + } + break; + + case PNG_CMAP_TRANS: + for (; outrow < end_row; outrow += stepx) + { + png_byte gray = *inrow++; + png_byte alpha = *inrow++; + + if (alpha == 0) + *outrow = PNG_CMAP_TRANS_BACKGROUND; + + else if (gray != PNG_CMAP_TRANS_BACKGROUND) + *outrow = gray; + + else + *outrow = (png_byte)(PNG_CMAP_TRANS_BACKGROUND+1); + } + break; + + case PNG_CMAP_RGB: + for (; outrow < end_row; outrow += stepx) + { + *outrow = PNG_RGB_INDEX(inrow[0], inrow[1], inrow[2]); + inrow += 3; + } + break; + + case PNG_CMAP_RGB_ALPHA: + for (; outrow < end_row; outrow += stepx) + { + unsigned int alpha = inrow[3]; + + /* Because the alpha entries only hold alpha==0.5 values + * split the processing at alpha==0.25 (64) and 0.75 + * (196). + */ + + if (alpha >= 196) + *outrow = PNG_RGB_INDEX(inrow[0], inrow[1], + inrow[2]); + + else if (alpha < 64) + *outrow = PNG_CMAP_RGB_ALPHA_BACKGROUND; + + else + { + /* Likewise there are three entries for each of r, g + * and b. We could select the entry by popcount on + * the top two bits on those architectures that + * support it, this is what the code below does, + * crudely. + */ + unsigned int back_i = PNG_CMAP_RGB_ALPHA_BACKGROUND+1; + + /* Here are how the values map: + * + * 0x00 .. 0x3f -> 0 + * 0x40 .. 0xbf -> 1 + * 0xc0 .. 0xff -> 2 + * + * So, as above with the explicit alpha checks, the + * breakpoints are at 64 and 196. + */ + if (inrow[0] & 0x80) back_i += 9; /* red */ + if (inrow[0] & 0x40) back_i += 9; + if (inrow[0] & 0x80) back_i += 3; /* green */ + if (inrow[0] & 0x40) back_i += 3; + if (inrow[0] & 0x80) back_i += 1; /* blue */ + if (inrow[0] & 0x40) back_i += 1; + + *outrow = (png_byte)back_i; + } + + inrow += 4; + } + break; + + default: + break; + } + } + } + } + + return 1; +} + +static int +png_image_read_colormapped(png_voidp argument) +{ + png_image_read_control *display = png_voidcast(png_image_read_control*, + argument); + png_imagep image = display->image; + png_controlp control = image->opaque; + png_structrp png_ptr = control->png_ptr; + png_inforp info_ptr = control->info_ptr; + + int passes = 0; /* As a flag */ + + PNG_SKIP_CHUNKS(png_ptr); + + /* Update the 'info' structure and make sure the result is as required; first + * make sure to turn on the interlace handling if it will be required + * (because it can't be turned on *after* the call to png_read_update_info!) + */ + if (display->colormap_processing == PNG_CMAP_NONE) + passes = png_set_interlace_handling(png_ptr); + + png_read_update_info(png_ptr, info_ptr); + + /* The expected output can be deduced from the colormap_processing option. */ + switch (display->colormap_processing) + { + case PNG_CMAP_NONE: + /* Output must be one channel and one byte per pixel, the output + * encoding can be anything. + */ + if ((info_ptr->color_type == PNG_COLOR_TYPE_PALETTE || + info_ptr->color_type == PNG_COLOR_TYPE_GRAY) && + info_ptr->bit_depth == 8) + break; + + goto bad_output; + + case PNG_CMAP_TRANS: + case PNG_CMAP_GA: + /* Output must be two channels and the 'G' one must be sRGB, the latter + * can be checked with an exact number because it should have been set + * to this number above! + */ + if (info_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && + info_ptr->bit_depth == 8 && + png_ptr->screen_gamma == PNG_GAMMA_sRGB && + image->colormap_entries == 256) + break; + + goto bad_output; + + case PNG_CMAP_RGB: + /* Output must be 8-bit sRGB encoded RGB */ + if (info_ptr->color_type == PNG_COLOR_TYPE_RGB && + info_ptr->bit_depth == 8 && + png_ptr->screen_gamma == PNG_GAMMA_sRGB && + image->colormap_entries == 216) + break; + + goto bad_output; + + case PNG_CMAP_RGB_ALPHA: + /* Output must be 8-bit sRGB encoded RGBA */ + if (info_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA && + info_ptr->bit_depth == 8 && + png_ptr->screen_gamma == PNG_GAMMA_sRGB && + image->colormap_entries == 244 /* 216 + 1 + 27 */) + break; + + /* goto bad_output; */ + /* FALL THROUGH */ + + default: + bad_output: + png_error(png_ptr, "bad color-map processing (internal error)"); + } + + /* Now read the rows. Do this here if it is possible to read directly into + * the output buffer, otherwise allocate a local row buffer of the maximum + * size libpng requires and call the relevant processing routine safely. + */ + { + png_voidp first_row = display->buffer; + ptrdiff_t row_bytes = display->row_stride; + + /* The following expression is designed to work correctly whether it gives + * a signed or an unsigned result. + */ + if (row_bytes < 0) + { + char *ptr = png_voidcast(char*, first_row); + ptr += (image->height-1) * (-row_bytes); + first_row = png_voidcast(png_voidp, ptr); + } + + display->first_row = first_row; + display->row_bytes = row_bytes; + } + + if (passes == 0) + { + int result; + png_voidp row = png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr)); + + display->local_row = row; + result = png_safe_execute(image, png_image_read_and_map, display); + display->local_row = NULL; + png_free(png_ptr, row); + + return result; + } + + else + { + png_alloc_size_t row_bytes = display->row_bytes; + + while (--passes >= 0) + { + png_uint_32 y = image->height; + png_bytep row = png_voidcast(png_bytep, display->first_row); + + while (y-- > 0) + { + png_read_row(png_ptr, row, NULL); + row += row_bytes; + } + } + + return 1; + } +} + +/* Just the row reading part of png_image_read. */ +static int +png_image_read_composite(png_voidp argument) +{ + png_image_read_control *display = png_voidcast(png_image_read_control*, + argument); + png_imagep image = display->image; + png_structrp png_ptr = image->opaque->png_ptr; + int passes; + + switch (png_ptr->interlaced) + { + case PNG_INTERLACE_NONE: + passes = 1; + break; + + case PNG_INTERLACE_ADAM7: + passes = PNG_INTERLACE_ADAM7_PASSES; + break; + + default: + passes = 0; + png_error(png_ptr, "unknown interlace type"); + } + + { + png_uint_32 height = image->height; + png_uint_32 width = image->width; + ptrdiff_t step_row = display->row_bytes; + unsigned int channels = (image->format & PNG_FORMAT_FLAG_COLOR) ? 3 : 1; + int pass; + + for (pass = 0; pass < passes; ++pass) + { + unsigned int startx, stepx, stepy; + png_uint_32 y; + + if (png_ptr->interlaced == PNG_INTERLACE_ADAM7) + { + /* The row may be empty for a short image: */ + if (PNG_PASS_COLS(width, pass) == 0) + continue; + + startx = PNG_PASS_START_COL(pass) * channels; + stepx = PNG_PASS_COL_OFFSET(pass) * channels; + y = PNG_PASS_START_ROW(pass); + stepy = PNG_PASS_ROW_OFFSET(pass); + } + + else + { + y = 0; + startx = 0; + stepx = channels; + stepy = 1; + } + + for (; ylocal_row); + png_bytep outrow; + png_const_bytep end_row; + + /* Read the row, which is packed: */ + png_read_row(png_ptr, inrow, NULL); + + outrow = png_voidcast(png_bytep, display->first_row); + outrow += y * step_row; + end_row = outrow + width * channels; + + /* Now do the composition on each pixel in this row. */ + outrow += startx; + for (; outrow < end_row; outrow += stepx) + { + png_byte alpha = inrow[channels]; + + if (alpha > 0) /* else no change to the output */ + { + unsigned int c; + + for (c=0; cimage; + png_structrp png_ptr = image->opaque->png_ptr; + png_inforp info_ptr = image->opaque->info_ptr; + png_uint_32 height = image->height; + png_uint_32 width = image->width; + int pass, passes; + + /* Double check the convoluted logic below. We expect to get here with + * libpng doing rgb to gray and gamma correction but background processing + * left to the png_image_read_background function. The rows libpng produce + * might be 8 or 16-bit but should always have two channels; gray plus alpha. + */ + if ((png_ptr->transformations & PNG_RGB_TO_GRAY) == 0) + png_error(png_ptr, "lost rgb to gray"); + + if ((png_ptr->transformations & PNG_COMPOSE) != 0) + png_error(png_ptr, "unexpected compose"); + + if (png_get_channels(png_ptr, info_ptr) != 2) + png_error(png_ptr, "lost/gained channels"); + + /* Expect the 8-bit case to always remove the alpha channel */ + if ((image->format & PNG_FORMAT_FLAG_LINEAR) == 0 && + (image->format & PNG_FORMAT_FLAG_ALPHA) != 0) + png_error(png_ptr, "unexpected 8-bit transformation"); + + switch (png_ptr->interlaced) + { + case PNG_INTERLACE_NONE: + passes = 1; + break; + + case PNG_INTERLACE_ADAM7: + passes = PNG_INTERLACE_ADAM7_PASSES; + break; + + default: + passes = 0; + png_error(png_ptr, "unknown interlace type"); + } + + switch (png_get_bit_depth(png_ptr, info_ptr)) + { + default: + png_error(png_ptr, "unexpected bit depth"); + break; + + case 8: + /* 8-bit sRGB gray values with an alpha channel; the alpha channel is + * to be removed by composing on a background: either the row if + * display->background is NULL or display->background->green if not. + * Unlike the code above ALPHA_OPTIMIZED has *not* been done. + */ + { + png_bytep first_row = png_voidcast(png_bytep, display->first_row); + ptrdiff_t step_row = display->row_bytes; + + for (pass = 0; pass < passes; ++pass) + { + png_bytep row = png_voidcast(png_bytep, + display->first_row); + unsigned int startx, stepx, stepy; + png_uint_32 y; + + if (png_ptr->interlaced == PNG_INTERLACE_ADAM7) + { + /* The row may be empty for a short image: */ + if (PNG_PASS_COLS(width, pass) == 0) + continue; + + startx = PNG_PASS_START_COL(pass); + stepx = PNG_PASS_COL_OFFSET(pass); + y = PNG_PASS_START_ROW(pass); + stepy = PNG_PASS_ROW_OFFSET(pass); + } + + else + { + y = 0; + startx = 0; + stepx = stepy = 1; + } + + if (display->background == NULL) + { + for (; ylocal_row); + png_bytep outrow = first_row + y * step_row; + png_const_bytep end_row = outrow + width; + + /* Read the row, which is packed: */ + png_read_row(png_ptr, inrow, NULL); + + /* Now do the composition on each pixel in this row. */ + outrow += startx; + for (; outrow < end_row; outrow += stepx) + { + png_byte alpha = inrow[1]; + + if (alpha > 0) /* else no change to the output */ + { + png_uint_32 component = inrow[0]; + + if (alpha < 255) /* else just use component */ + { + /* Since PNG_OPTIMIZED_ALPHA was not set it is + * necessary to invert the sRGB transfer + * function and multiply the alpha out. + */ + component = png_sRGB_table[component] * alpha; + component += png_sRGB_table[outrow[0]] * + (255-alpha); + component = PNG_sRGB_FROM_LINEAR(component); + } + + outrow[0] = (png_byte)component; + } + + inrow += 2; /* gray and alpha channel */ + } + } + } + + else /* constant background value */ + { + png_byte background8 = display->background->green; + png_uint_16 background = png_sRGB_table[background8]; + + for (; ylocal_row); + png_bytep outrow = first_row + y * step_row; + png_const_bytep end_row = outrow + width; + + /* Read the row, which is packed: */ + png_read_row(png_ptr, inrow, NULL); + + /* Now do the composition on each pixel in this row. */ + outrow += startx; + for (; outrow < end_row; outrow += stepx) + { + png_byte alpha = inrow[1]; + + if (alpha > 0) /* else use background */ + { + png_uint_32 component = inrow[0]; + + if (alpha < 255) /* else just use component */ + { + component = png_sRGB_table[component] * alpha; + component += background * (255-alpha); + component = PNG_sRGB_FROM_LINEAR(component); + } + + outrow[0] = (png_byte)component; + } + + else + outrow[0] = background8; + + inrow += 2; /* gray and alpha channel */ + } + + row += display->row_bytes; + } + } + } + } + break; + + case 16: + /* 16-bit linear with pre-multiplied alpha; the pre-multiplication must + * still be done and, maybe, the alpha channel removed. This code also + * handles the alpha-first option. + */ + { + png_uint_16p first_row = png_voidcast(png_uint_16p, + display->first_row); + /* The division by two is safe because the caller passed in a + * stride which was multiplied by 2 (below) to get row_bytes. + */ + ptrdiff_t step_row = display->row_bytes / 2; + int preserve_alpha = (image->format & PNG_FORMAT_FLAG_ALPHA) != 0; + unsigned int outchannels = 1+preserve_alpha; + int swap_alpha = 0; + + if (preserve_alpha && (image->format & PNG_FORMAT_FLAG_AFIRST)) + swap_alpha = 1; + + for (pass = 0; pass < passes; ++pass) + { + unsigned int startx, stepx, stepy; + png_uint_32 y; + + /* The 'x' start and step are adjusted to output components here. + */ + if (png_ptr->interlaced == PNG_INTERLACE_ADAM7) + { + /* The row may be empty for a short image: */ + if (PNG_PASS_COLS(width, pass) == 0) + continue; + + startx = PNG_PASS_START_COL(pass) * outchannels; + stepx = PNG_PASS_COL_OFFSET(pass) * outchannels; + y = PNG_PASS_START_ROW(pass); + stepy = PNG_PASS_ROW_OFFSET(pass); + } + + else + { + y = 0; + startx = 0; + stepx = outchannels; + stepy = 1; + } + + for (; ylocal_row), NULL); + inrow = png_voidcast(png_const_uint_16p, display->local_row); + + /* Now do the pre-multiplication on each pixel in this row. + */ + outrow += startx; + for (; outrow < end_row; outrow += stepx) + { + png_uint_32 component = inrow[0]; + png_uint_16 alpha = inrow[1]; + + if (alpha > 0) /* else 0 */ + { + if (alpha < 65535) /* else just use component */ + { + component *= alpha; + component += 32767; + component /= 65535; + } + } + + else + component = 0; + + outrow[swap_alpha] = (png_uint_16)component; + if (preserve_alpha) + outrow[1 ^ swap_alpha] = alpha; + + inrow += 2; /* components and alpha channel */ + } + } + } + } + break; + } + + return 1; +} + +/* The guts of png_image_finish_read as a png_safe_execute callback. */ +static int +png_image_read_direct(png_voidp argument) +{ + png_image_read_control *display = png_voidcast(png_image_read_control*, + argument); + png_imagep image = display->image; + png_structrp png_ptr = image->opaque->png_ptr; + png_inforp info_ptr = image->opaque->info_ptr; + + png_uint_32 format = image->format; + int linear = (format & PNG_FORMAT_FLAG_LINEAR) != 0; + int do_local_compose = 0; + int do_local_background = 0; /* to avoid double gamma correction bug */ + int passes = 0; + + /* Add transforms to ensure the correct output format is produced then check + * that the required implementation support is there. Always expand; always + * need 8 bits minimum, no palette and expanded tRNS. + */ + png_set_expand(png_ptr); + + /* Now check the format to see if it was modified. */ + { + png_uint_32 base_format = png_image_format(png_ptr) & + ~PNG_FORMAT_FLAG_COLORMAP /* removed by png_set_expand */; + png_uint_32 change = format ^ base_format; + png_fixed_point output_gamma; + int mode; /* alpha mode */ + + /* Do this first so that we have a record if rgb to gray is happening. */ + if (change & PNG_FORMAT_FLAG_COLOR) + { + /* gray<->color transformation required. */ + if (format & PNG_FORMAT_FLAG_COLOR) + png_set_gray_to_rgb(png_ptr); + + else + { + /* libpng can't do both rgb to gray and + * background/pre-multiplication if there is also significant gamma + * correction, because both operations require linear colors and + * the code only supports one transform doing the gamma correction. + * Handle this by doing the pre-multiplication or background + * operation in this code, if necessary. + * + * TODO: fix this by rewriting pngrtran.c (!) + * + * For the moment (given that fixing this in pngrtran.c is an + * enormous change) 'do_local_background' is used to indicate that + * the problem exists. + */ + if (base_format & PNG_FORMAT_FLAG_ALPHA) + do_local_background = 1/*maybe*/; + + png_set_rgb_to_gray_fixed(png_ptr, PNG_ERROR_ACTION_NONE, + PNG_RGB_TO_GRAY_DEFAULT, PNG_RGB_TO_GRAY_DEFAULT); + } + + change &= ~PNG_FORMAT_FLAG_COLOR; + } + + /* Set the gamma appropriately, linear for 16-bit input, sRGB otherwise. + */ + { + png_fixed_point input_gamma_default; + + if ((base_format & PNG_FORMAT_FLAG_LINEAR) && + (image->flags & PNG_IMAGE_FLAG_16BIT_sRGB) == 0) + input_gamma_default = PNG_GAMMA_LINEAR; + else + input_gamma_default = PNG_DEFAULT_sRGB; + + /* Call png_set_alpha_mode to set the default for the input gamma; the + * output gamma is set by a second call below. + */ + png_set_alpha_mode_fixed(png_ptr, PNG_ALPHA_PNG, input_gamma_default); + } + + if (linear) + { + /* If there *is* an alpha channel in the input it must be multiplied + * out; use PNG_ALPHA_STANDARD, otherwise just use PNG_ALPHA_PNG. + */ + if (base_format & PNG_FORMAT_FLAG_ALPHA) + mode = PNG_ALPHA_STANDARD; /* associated alpha */ + + else + mode = PNG_ALPHA_PNG; + + output_gamma = PNG_GAMMA_LINEAR; + } + + else + { + mode = PNG_ALPHA_PNG; + output_gamma = PNG_DEFAULT_sRGB; + } + + /* If 'do_local_background' is set check for the presence of gamma + * correction; this is part of the work-round for the libpng bug + * described above. + * + * TODO: fix libpng and remove this. + */ + if (do_local_background) + { + png_fixed_point gtest; + + /* This is 'png_gamma_threshold' from pngrtran.c; the test used for + * gamma correction, the screen gamma hasn't been set on png_struct + * yet; it's set below. png_struct::gamma, however, is set to the + * final value. + */ + if (png_muldiv(>est, output_gamma, png_ptr->colorspace.gamma, + PNG_FP_1) && !png_gamma_significant(gtest)) + do_local_background = 0; + + else if (mode == PNG_ALPHA_STANDARD) + { + do_local_background = 2/*required*/; + mode = PNG_ALPHA_PNG; /* prevent libpng doing it */ + } + + /* else leave as 1 for the checks below */ + } + + /* If the bit-depth changes then handle that here. */ + if (change & PNG_FORMAT_FLAG_LINEAR) + { + if (linear /*16-bit output*/) + png_set_expand_16(png_ptr); + + else /* 8-bit output */ + png_set_scale_16(png_ptr); + + change &= ~PNG_FORMAT_FLAG_LINEAR; + } + + /* Now the background/alpha channel changes. */ + if (change & PNG_FORMAT_FLAG_ALPHA) + { + /* Removing an alpha channel requires composition for the 8-bit + * formats; for the 16-bit it is already done, above, by the + * pre-multiplication and the channel just needs to be stripped. + */ + if (base_format & PNG_FORMAT_FLAG_ALPHA) + { + /* If RGB->gray is happening the alpha channel must be left and the + * operation completed locally. + * + * TODO: fix libpng and remove this. + */ + if (do_local_background) + do_local_background = 2/*required*/; + + /* 16-bit output: just remove the channel */ + else if (linear) /* compose on black (well, pre-multiply) */ + png_set_strip_alpha(png_ptr); + + /* 8-bit output: do an appropriate compose */ + else if (display->background != NULL) + { + png_color_16 c; + + c.index = 0; /*unused*/ + c.red = display->background->red; + c.green = display->background->green; + c.blue = display->background->blue; + c.gray = display->background->green; + + /* This is always an 8-bit sRGB value, using the 'green' channel + * for gray is much better than calculating the luminance here; + * we can get off-by-one errors in that calculation relative to + * the app expectations and that will show up in transparent + * pixels. + */ + png_set_background_fixed(png_ptr, &c, + PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/, + 0/*gamma: not used*/); + } + + else /* compose on row: implemented below. */ + { + do_local_compose = 1; + /* This leaves the alpha channel in the output, so it has to be + * removed by the code below. Set the encoding to the 'OPTIMIZE' + * one so the code only has to hack on the pixels that require + * composition. + */ + mode = PNG_ALPHA_OPTIMIZED; + } + } + + else /* output needs an alpha channel */ + { + /* This is tricky because it happens before the swap operation has + * been accomplished; however, the swap does *not* swap the added + * alpha channel (weird API), so it must be added in the correct + * place. + */ + png_uint_32 filler; /* opaque filler */ + int where; + + if (linear) + filler = 65535; + + else + filler = 255; + +# ifdef PNG_FORMAT_AFIRST_SUPPORTED + if (format & PNG_FORMAT_FLAG_AFIRST) + { + where = PNG_FILLER_BEFORE; + change &= ~PNG_FORMAT_FLAG_AFIRST; + } + + else +# endif + where = PNG_FILLER_AFTER; + + png_set_add_alpha(png_ptr, filler, where); + } + + /* This stops the (irrelevant) call to swap_alpha below. */ + change &= ~PNG_FORMAT_FLAG_ALPHA; + } + + /* Now set the alpha mode correctly; this is always done, even if there is + * no alpha channel in either the input or the output because it correctly + * sets the output gamma. + */ + png_set_alpha_mode_fixed(png_ptr, mode, output_gamma); + +# ifdef PNG_FORMAT_BGR_SUPPORTED + if (change & PNG_FORMAT_FLAG_BGR) + { + /* Check only the output format; PNG is never BGR; don't do this if + * the output is gray, but fix up the 'format' value in that case. + */ + if (format & PNG_FORMAT_FLAG_COLOR) + png_set_bgr(png_ptr); + + else + format &= ~PNG_FORMAT_FLAG_BGR; + + change &= ~PNG_FORMAT_FLAG_BGR; + } +# endif + +# ifdef PNG_FORMAT_AFIRST_SUPPORTED + if (change & PNG_FORMAT_FLAG_AFIRST) + { + /* Only relevant if there is an alpha channel - it's particularly + * important to handle this correctly because do_local_compose may + * be set above and then libpng will keep the alpha channel for this + * code to remove. + */ + if (format & PNG_FORMAT_FLAG_ALPHA) + { + /* Disable this if doing a local background, + * TODO: remove this when local background is no longer required. + */ + if (do_local_background != 2) + png_set_swap_alpha(png_ptr); + } + + else + format &= ~PNG_FORMAT_FLAG_AFIRST; + + change &= ~PNG_FORMAT_FLAG_AFIRST; + } +# endif + + /* If the *output* is 16-bit then we need to check for a byte-swap on this + * architecture. + */ + if (linear) + { + PNG_CONST png_uint_16 le = 0x0001; + + if (*(png_const_bytep)&le) + png_set_swap(png_ptr); + } + + /* If change is not now 0 some transformation is missing - error out. */ + if (change) + png_error(png_ptr, "png_read_image: unsupported transformation"); + } + + PNG_SKIP_CHUNKS(png_ptr); + + /* Update the 'info' structure and make sure the result is as required; first + * make sure to turn on the interlace handling if it will be required + * (because it can't be turned on *after* the call to png_read_update_info!) + * + * TODO: remove the do_local_background fixup below. + */ + if (!do_local_compose && do_local_background != 2) + passes = png_set_interlace_handling(png_ptr); + + png_read_update_info(png_ptr, info_ptr); + + { + png_uint_32 info_format = 0; + + if (info_ptr->color_type & PNG_COLOR_MASK_COLOR) + info_format |= PNG_FORMAT_FLAG_COLOR; + + if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA) + { + /* do_local_compose removes this channel below. */ + if (!do_local_compose) + { + /* do_local_background does the same if required. */ + if (do_local_background != 2 || + (format & PNG_FORMAT_FLAG_ALPHA) != 0) + info_format |= PNG_FORMAT_FLAG_ALPHA; + } + } + + else if (do_local_compose) /* internal error */ + png_error(png_ptr, "png_image_read: alpha channel lost"); + + if (info_ptr->bit_depth == 16) + info_format |= PNG_FORMAT_FLAG_LINEAR; + +# ifdef PNG_FORMAT_BGR_SUPPORTED + if (png_ptr->transformations & PNG_BGR) + info_format |= PNG_FORMAT_FLAG_BGR; +# endif + +# ifdef PNG_FORMAT_AFIRST_SUPPORTED + if (do_local_background == 2) + { + if (format & PNG_FORMAT_FLAG_AFIRST) + info_format |= PNG_FORMAT_FLAG_AFIRST; + } + + if ((png_ptr->transformations & PNG_SWAP_ALPHA) != 0 || + ((png_ptr->transformations & PNG_ADD_ALPHA) != 0 && + (png_ptr->flags & PNG_FLAG_FILLER_AFTER) == 0)) + { + if (do_local_background == 2) + png_error(png_ptr, "unexpected alpha swap transformation"); + + info_format |= PNG_FORMAT_FLAG_AFIRST; + } +# endif + + /* This is actually an internal error. */ + if (info_format != format) + png_error(png_ptr, "png_read_image: invalid transformations"); + } + + /* Now read the rows. If do_local_compose is set then it is necessary to use + * a local row buffer. The output will be GA, RGBA or BGRA and must be + * converted to G, RGB or BGR as appropriate. The 'local_row' member of the + * display acts as a flag. + */ + { + png_voidp first_row = display->buffer; + ptrdiff_t row_bytes = display->row_stride; + + if (linear) + row_bytes *= 2; + + /* The following expression is designed to work correctly whether it gives + * a signed or an unsigned result. + */ + if (row_bytes < 0) + { + char *ptr = png_voidcast(char*, first_row); + ptr += (image->height-1) * (-row_bytes); + first_row = png_voidcast(png_voidp, ptr); + } + + display->first_row = first_row; + display->row_bytes = row_bytes; + } + + if (do_local_compose) + { + int result; + png_voidp row = png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr)); + + display->local_row = row; + result = png_safe_execute(image, png_image_read_composite, display); + display->local_row = NULL; + png_free(png_ptr, row); + + return result; + } + + else if (do_local_background == 2) + { + int result; + png_voidp row = png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr)); + + display->local_row = row; + result = png_safe_execute(image, png_image_read_background, display); + display->local_row = NULL; + png_free(png_ptr, row); + + return result; + } + + else + { + png_alloc_size_t row_bytes = display->row_bytes; + + while (--passes >= 0) + { + png_uint_32 y = image->height; + png_bytep row = png_voidcast(png_bytep, display->first_row); + + while (y-- > 0) + { + png_read_row(png_ptr, row, NULL); + row += row_bytes; + } + } + + return 1; + } +} + +int PNGAPI +png_image_finish_read(png_imagep image, png_const_colorp background, + void *buffer, png_int_32 row_stride, void *colormap) +{ + if (image != NULL && image->version == PNG_IMAGE_VERSION) + { + png_uint_32 check; + + if (row_stride == 0) + row_stride = PNG_IMAGE_ROW_STRIDE(*image); + + if (row_stride < 0) + check = -row_stride; + + else + check = row_stride; + + if (image->opaque != NULL && buffer != NULL && + check >= PNG_IMAGE_ROW_STRIDE(*image)) + { + if ((image->format & PNG_FORMAT_FLAG_COLORMAP) == 0 || + (image->colormap_entries > 0 && colormap != NULL)) + { + int result; + png_image_read_control display; + + memset(&display, 0, (sizeof display)); + display.image = image; + display.buffer = buffer; + display.row_stride = row_stride; + display.colormap = colormap; + display.background = background; + display.local_row = NULL; + + /* Choose the correct 'end' routine; for the color-map case all the + * setup has already been done. + */ + if (image->format & PNG_FORMAT_FLAG_COLORMAP) + result = + png_safe_execute(image, png_image_read_colormap, &display) && + png_safe_execute(image, png_image_read_colormapped, &display); + + else + result = + png_safe_execute(image, png_image_read_direct, &display); + + png_image_free(image); + return result; + } + + else + return png_image_error(image, + "png_image_finish_read[color-map]: no color-map"); + } + + else + return png_image_error(image, + "png_image_finish_read: invalid argument"); + } + + else if (image != NULL) + return png_image_error(image, + "png_image_finish_read: damaged PNG_IMAGE_VERSION"); + + return 0; +} + +#endif /* PNG_SIMPLIFIED_READ_SUPPORTED */ #endif /* PNG_READ_SUPPORTED */ diff --git a/project/jni/png/pngrio.c b/project/jni/png/pngrio.c index 710f4f0f4..d7864407b 100644 --- a/project/jni/png/pngrio.c +++ b/project/jni/png/pngrio.c @@ -1,8 +1,8 @@ /* pngrio.c - functions for data input * - * Last changed in libpng 1.4.6 [January 14, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.0 [February 14, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -18,11 +18,10 @@ * libpng use it at run time with png_set_read_fn(...). */ -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" -#ifdef PNG_READ_SUPPORTED #include "pngpriv.h" +#ifdef PNG_READ_SUPPORTED + /* Read the data from whatever input you are using. The default routine * reads from a file pointer. Note that this routine sometimes gets called * with very small lengths, so you should implement some kind of simple @@ -30,12 +29,13 @@ * to read more then 64K on a 16 bit machine. */ void /* PRIVATE */ -png_read_data(png_structp png_ptr, png_bytep data, png_size_t length) +png_read_data(png_structrp png_ptr, png_bytep data, png_size_t length) { png_debug1(4, "reading %d bytes", (int)length); if (png_ptr->read_data_fn != NULL) (*(png_ptr->read_data_fn))(png_ptr, data, length); + else png_error(png_ptr, "Call to NULL read function"); } @@ -46,80 +46,34 @@ png_read_data(png_structp png_ptr, png_bytep data, png_size_t length) * read_data function and use it at run time with png_set_read_fn(), rather * than changing the library. */ -#ifndef USE_FAR_KEYWORD -void PNGAPI +void PNGCBAPI png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) { png_size_t check; if (png_ptr == NULL) return; + /* fread() returns 0 on error, so it is OK to store this in a png_size_t * instead of an int, which is what fread() actually returns. */ - check = fread(data, 1, length, (png_FILE_p)png_ptr->io_ptr); + check = fread(data, 1, length, png_voidcast(png_FILE_p, png_ptr->io_ptr)); if (check != length) png_error(png_ptr, "Read Error"); } -#else -/* This is the model-independent version. Since the standard I/O library - can't handle far buffers in the medium and small models, we have to copy - the data. -*/ - -#define NEAR_BUF_SIZE 1024 -#define MIN(a,b) (a <= b ? a : b) - -static void PNGAPI -png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) -{ - png_size_t check; - png_byte *n_data; - png_FILE_p io_ptr; - - if (png_ptr == NULL) - return; - /* Check if data really is near. If so, use usual code. */ - n_data = (png_byte *)CVT_PTR_NOCHECK(data); - io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr); - if ((png_bytep)n_data == data) - { - check = fread(n_data, 1, length, io_ptr); - } - else - { - png_byte buf[NEAR_BUF_SIZE]; - png_size_t read, remaining, err; - check = 0; - remaining = length; - do - { - read = MIN(NEAR_BUF_SIZE, remaining); - err = fread(buf, 1, read, io_ptr); - png_memcpy(data, buf, read); /* copy far buffer to near buffer */ - if (err != read) - break; - else - check += err; - data += read; - remaining -= read; - } - while (remaining != 0); - } - if ((png_uint_32)check != (png_uint_32)length) - png_error(png_ptr, "read Error"); -} -#endif #endif /* This function allows the application to supply a new input function * for libpng if standard C streams aren't being used. * * This function takes as its arguments: + * * png_ptr - pointer to a png input data structure + * * io_ptr - pointer to user supplied structure containing info about * the input functions. May be NULL. + * * read_data_fn - pointer to a new input function that takes as its * arguments a pointer to a png_struct, a pointer to * a location where input data can be stored, and a 32-bit @@ -130,16 +84,18 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) * be used. */ void PNGAPI -png_set_read_fn(png_structp png_ptr, png_voidp io_ptr, +png_set_read_fn(png_structrp png_ptr, png_voidp io_ptr, png_rw_ptr read_data_fn) { if (png_ptr == NULL) return; + png_ptr->io_ptr = io_ptr; #ifdef PNG_STDIO_SUPPORTED if (read_data_fn != NULL) png_ptr->read_data_fn = read_data_fn; + else png_ptr->read_data_fn = png_default_read_data; #else @@ -151,9 +107,8 @@ png_set_read_fn(png_structp png_ptr, png_voidp io_ptr, { png_ptr->write_data_fn = NULL; png_warning(png_ptr, - "It's an error to set both read_data_fn and write_data_fn in the "); - png_warning(png_ptr, - "same structure. Resetting write_data_fn to NULL"); + "Can't set both read_data_fn and write_data_fn in the" + " same structure"); } #ifdef PNG_WRITE_FLUSH_SUPPORTED diff --git a/project/jni/png/pngrtran.c b/project/jni/png/pngrtran.c index a475f9a9a..5c6bbd316 100644 --- a/project/jni/png/pngrtran.c +++ b/project/jni/png/pngrtran.c @@ -1,8 +1,8 @@ /* pngrtran.c - transforms the data in a row for PNG readers * - * Last changed in libpng 1.4.6 [%RDATE%] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.4 [September 16, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -16,14 +16,13 @@ * in pngtrans.c. */ -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" -#ifdef PNG_READ_SUPPORTED #include "pngpriv.h" +#ifdef PNG_READ_SUPPORTED + /* Set the action on getting a CRC error for an ancillary or critical chunk. */ void PNGAPI -png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action) +png_set_crc_action(png_structrp png_ptr, int crit_action, int ancil_action) { png_debug(1, "in png_set_crc_action"); @@ -89,86 +88,336 @@ png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action) } } -#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \ - defined(PNG_FLOATING_POINT_SUPPORTED) -/* Handle alpha and tRNS via a background color */ -void PNGAPI -png_set_background(png_structp png_ptr, - png_color_16p background_color, int background_gamma_code, - int need_expand, double background_gamma) +#ifdef PNG_READ_TRANSFORMS_SUPPORTED +/* Is it OK to set a transformation now? Only if png_start_read_image or + * png_read_update_info have not been called. It is not necessary for the IHDR + * to have been read in all cases, the parameter allows for this check too. + */ +static int +png_rtran_ok(png_structrp png_ptr, int need_IHDR) { - png_debug(1, "in png_set_background"); + if (png_ptr != NULL) + { + if (png_ptr->flags & PNG_FLAG_ROW_INIT) + png_app_error(png_ptr, + "invalid after png_start_read_image or png_read_update_info"); - if (png_ptr == NULL) + else if (need_IHDR && (png_ptr->mode & PNG_HAVE_IHDR) == 0) + png_app_error(png_ptr, "invalid before the PNG header has been read"); + + else + { + /* Turn on failure to initialize correctly for all transforms. */ + png_ptr->flags |= PNG_FLAG_DETECT_UNINITIALIZED; + + return 1; /* Ok */ + } + } + + return 0; /* no png_error possible! */ +} +#endif + +#ifdef PNG_READ_BACKGROUND_SUPPORTED +/* Handle alpha and tRNS via a background color */ +void PNGFAPI +png_set_background_fixed(png_structrp png_ptr, + png_const_color_16p background_color, int background_gamma_code, + int need_expand, png_fixed_point background_gamma) +{ + png_debug(1, "in png_set_background_fixed"); + + if (!png_rtran_ok(png_ptr, 0) || background_color == NULL) return; + if (background_gamma_code == PNG_BACKGROUND_GAMMA_UNKNOWN) { png_warning(png_ptr, "Application must supply a known background gamma"); return; } - png_ptr->transformations |= PNG_BACKGROUND; - png_memcpy(&(png_ptr->background), background_color, - png_sizeof(png_color_16)); - png_ptr->background_gamma = (float)background_gamma; + png_ptr->transformations |= PNG_COMPOSE | PNG_STRIP_ALPHA; + png_ptr->transformations &= ~PNG_ENCODE_ALPHA; + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; + + png_ptr->background = *background_color; + png_ptr->background_gamma = background_gamma; png_ptr->background_gamma_type = (png_byte)(background_gamma_code); - png_ptr->transformations |= (need_expand ? PNG_BACKGROUND_EXPAND : 0); + if (need_expand) + png_ptr->transformations |= PNG_BACKGROUND_EXPAND; + else + png_ptr->transformations &= ~PNG_BACKGROUND_EXPAND; +} + +# ifdef PNG_FLOATING_POINT_SUPPORTED +void PNGAPI +png_set_background(png_structrp png_ptr, + png_const_color_16p background_color, int background_gamma_code, + int need_expand, double background_gamma) +{ + png_set_background_fixed(png_ptr, background_color, background_gamma_code, + need_expand, png_fixed(png_ptr, background_gamma, "png_set_background")); +} +# endif /* FLOATING_POINT */ +#endif /* READ_BACKGROUND */ + +/* Scale 16-bit depth files to 8-bit depth. If both of these are set then the + * one that pngrtran does first (scale) happens. This is necessary to allow the + * TRANSFORM and API behavior to be somewhat consistent, and it's simpler. + */ +#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED +void PNGAPI +png_set_scale_16(png_structrp png_ptr) +{ + png_debug(1, "in png_set_scale_16"); + + if (!png_rtran_ok(png_ptr, 0)) + return; + + png_ptr->transformations |= PNG_SCALE_16_TO_8; } #endif -#ifdef PNG_READ_16_TO_8_SUPPORTED -/* Strip 16 bit depth files to 8 bit depth */ +#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED +/* Chop 16-bit depth files to 8-bit depth */ void PNGAPI -png_set_strip_16(png_structp png_ptr) +png_set_strip_16(png_structrp png_ptr) { png_debug(1, "in png_set_strip_16"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; + png_ptr->transformations |= PNG_16_TO_8; } #endif #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED void PNGAPI -png_set_strip_alpha(png_structp png_ptr) +png_set_strip_alpha(png_structrp png_ptr) { png_debug(1, "in png_set_strip_alpha"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; - png_ptr->flags |= PNG_FLAG_STRIP_ALPHA; + + png_ptr->transformations |= PNG_STRIP_ALPHA; } #endif +#if defined(PNG_READ_ALPHA_MODE_SUPPORTED) || defined(PNG_READ_GAMMA_SUPPORTED) +static png_fixed_point +translate_gamma_flags(png_structrp png_ptr, png_fixed_point output_gamma, + int is_screen) +{ + /* Check for flag values. The main reason for having the old Mac value as a + * flag is that it is pretty near impossible to work out what the correct + * value is from Apple documentation - a working Mac system is needed to + * discover the value! + */ + if (output_gamma == PNG_DEFAULT_sRGB || + output_gamma == PNG_FP_1 / PNG_DEFAULT_sRGB) + { + /* If there is no sRGB support this just sets the gamma to the standard + * sRGB value. (This is a side effect of using this function!) + */ +# ifdef PNG_READ_sRGB_SUPPORTED + png_ptr->flags |= PNG_FLAG_ASSUME_sRGB; +# else + PNG_UNUSED(png_ptr) +# endif + if (is_screen) + output_gamma = PNG_GAMMA_sRGB; + else + output_gamma = PNG_GAMMA_sRGB_INVERSE; + } + + else if (output_gamma == PNG_GAMMA_MAC_18 || + output_gamma == PNG_FP_1 / PNG_GAMMA_MAC_18) + { + if (is_screen) + output_gamma = PNG_GAMMA_MAC_OLD; + else + output_gamma = PNG_GAMMA_MAC_INVERSE; + } + + return output_gamma; +} + +# ifdef PNG_FLOATING_POINT_SUPPORTED +static png_fixed_point +convert_gamma_value(png_structrp png_ptr, double output_gamma) +{ + /* The following silently ignores cases where fixed point (times 100,000) + * gamma values are passed to the floating point API. This is safe and it + * means the fixed point constants work just fine with the floating point + * API. The alternative would just lead to undetected errors and spurious + * bug reports. Negative values fail inside the _fixed API unless they + * correspond to the flag values. + */ + if (output_gamma > 0 && output_gamma < 128) + output_gamma *= PNG_FP_1; + + /* This preserves -1 and -2 exactly: */ + output_gamma = floor(output_gamma + .5); + + if (output_gamma > PNG_FP_MAX || output_gamma < PNG_FP_MIN) + png_fixed_error(png_ptr, "gamma value"); + + return (png_fixed_point)output_gamma; +} +# endif +#endif /* READ_ALPHA_MODE || READ_GAMMA */ + +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED +void PNGFAPI +png_set_alpha_mode_fixed(png_structrp png_ptr, int mode, + png_fixed_point output_gamma) +{ + int compose = 0; + png_fixed_point file_gamma; + + png_debug(1, "in png_set_alpha_mode"); + + if (!png_rtran_ok(png_ptr, 0)) + return; + + output_gamma = translate_gamma_flags(png_ptr, output_gamma, 1/*screen*/); + + /* Validate the value to ensure it is in a reasonable range. The value + * is expected to be 1 or greater, but this range test allows for some + * viewing correction values. The intent is to weed out users of this API + * who use the inverse of the gamma value accidentally! Since some of these + * values are reasonable this may have to be changed. + */ + if (output_gamma < 70000 || output_gamma > 300000) + png_error(png_ptr, "output gamma out of expected range"); + + /* The default file gamma is the inverse of the output gamma; the output + * gamma may be changed below so get the file value first: + */ + file_gamma = png_reciprocal(output_gamma); + + /* There are really 8 possibilities here, composed of any combination + * of: + * + * premultiply the color channels + * do not encode non-opaque pixels + * encode the alpha as well as the color channels + * + * The differences disappear if the input/output ('screen') gamma is 1.0, + * because then the encoding is a no-op and there is only the choice of + * premultiplying the color channels or not. + * + * png_set_alpha_mode and png_set_background interact because both use + * png_compose to do the work. Calling both is only useful when + * png_set_alpha_mode is used to set the default mode - PNG_ALPHA_PNG - along + * with a default gamma value. Otherwise PNG_COMPOSE must not be set. + */ + switch (mode) + { + case PNG_ALPHA_PNG: /* default: png standard */ + /* No compose, but it may be set by png_set_background! */ + png_ptr->transformations &= ~PNG_ENCODE_ALPHA; + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; + break; + + case PNG_ALPHA_ASSOCIATED: /* color channels premultiplied */ + compose = 1; + png_ptr->transformations &= ~PNG_ENCODE_ALPHA; + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; + /* The output is linear: */ + output_gamma = PNG_FP_1; + break; + + case PNG_ALPHA_OPTIMIZED: /* associated, non-opaque pixels linear */ + compose = 1; + png_ptr->transformations &= ~PNG_ENCODE_ALPHA; + png_ptr->flags |= PNG_FLAG_OPTIMIZE_ALPHA; + /* output_gamma records the encoding of opaque pixels! */ + break; + + case PNG_ALPHA_BROKEN: /* associated, non-linear, alpha encoded */ + compose = 1; + png_ptr->transformations |= PNG_ENCODE_ALPHA; + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; + break; + + default: + png_error(png_ptr, "invalid alpha mode"); + } + + /* Only set the default gamma if the file gamma has not been set (this has + * the side effect that the gamma in a second call to png_set_alpha_mode will + * be ignored.) + */ + if (png_ptr->colorspace.gamma == 0) + { + png_ptr->colorspace.gamma = file_gamma; + png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA; + } + + /* But always set the output gamma: */ + png_ptr->screen_gamma = output_gamma; + + /* Finally, if pre-multiplying, set the background fields to achieve the + * desired result. + */ + if (compose) + { + /* And obtain alpha pre-multiplication by composing on black: */ + memset(&png_ptr->background, 0, (sizeof png_ptr->background)); + png_ptr->background_gamma = png_ptr->colorspace.gamma; /* just in case */ + png_ptr->background_gamma_type = PNG_BACKGROUND_GAMMA_FILE; + png_ptr->transformations &= ~PNG_BACKGROUND_EXPAND; + + if (png_ptr->transformations & PNG_COMPOSE) + png_error(png_ptr, + "conflicting calls to set alpha mode and background"); + + png_ptr->transformations |= PNG_COMPOSE; + } +} + +# ifdef PNG_FLOATING_POINT_SUPPORTED +void PNGAPI +png_set_alpha_mode(png_structrp png_ptr, int mode, double output_gamma) +{ + png_set_alpha_mode_fixed(png_ptr, mode, convert_gamma_value(png_ptr, + output_gamma)); +} +# endif +#endif + #ifdef PNG_READ_QUANTIZE_SUPPORTED -/* Quantize file to 8 bit. Supply a palette, the current number +/* Dither file to 8-bit. Supply a palette, the current number * of elements in the palette, the maximum number of elements * allowed, and a histogram if possible. If the current number * of colors is greater then the maximum number, the palette will be * modified to fit in the maximum number. "full_quantize" indicates - * whether we need a quantizeing cube set up for RGB images, or if we + * whether we need a quantizing cube set up for RGB images, or if we * simply are reducing the number of colors in a paletted image. */ typedef struct png_dsort_struct { - struct png_dsort_struct FAR * next; + struct png_dsort_struct * next; png_byte left; png_byte right; } png_dsort; -typedef png_dsort FAR * png_dsortp; -typedef png_dsort FAR * FAR * png_dsortpp; +typedef png_dsort * png_dsortp; +typedef png_dsort * * png_dsortpp; void PNGAPI -png_set_quantize(png_structp png_ptr, png_colorp palette, - int num_palette, int maximum_colors, png_uint_16p histogram, - int full_quantize) +png_set_quantize(png_structrp png_ptr, png_colorp palette, + int num_palette, int maximum_colors, png_const_uint_16p histogram, + int full_quantize) { png_debug(1, "in png_set_quantize"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; + png_ptr->transformations |= PNG_QUANTIZE; if (!full_quantize) @@ -176,7 +425,7 @@ png_set_quantize(png_structp png_ptr, png_colorp palette, int i; png_ptr->quantize_index = (png_bytep)png_malloc(png_ptr, - (png_uint_32)(num_palette * png_sizeof(png_byte))); + (png_uint_32)(num_palette * (sizeof (png_byte)))); for (i = 0; i < num_palette; i++) png_ptr->quantize_index[i] = (png_byte)i; } @@ -193,7 +442,7 @@ png_set_quantize(png_structp png_ptr, png_colorp palette, /* Initialize an array to sort colors */ png_ptr->quantize_sort = (png_bytep)png_malloc(png_ptr, - (png_uint_32)(num_palette * png_sizeof(png_byte))); + (png_uint_32)(num_palette * (sizeof (png_byte)))); /* Initialize the quantize_sort array */ for (i = 0; i < num_palette; i++) @@ -225,6 +474,7 @@ png_set_quantize(png_structp png_ptr, png_colorp palette, done = 0; } } + if (done) break; } @@ -244,6 +494,7 @@ png_set_quantize(png_structp png_ptr, png_colorp palette, do j--; while ((int)png_ptr->quantize_sort[j] >= maximum_colors); + palette[i] = palette[j]; } } @@ -325,9 +576,9 @@ png_set_quantize(png_structp png_ptr, png_colorp palette, /* Initialize palette index arrays */ png_ptr->index_to_palette = (png_bytep)png_malloc(png_ptr, - (png_uint_32)(num_palette * png_sizeof(png_byte))); + (png_uint_32)(num_palette * (sizeof (png_byte)))); png_ptr->palette_to_index = (png_bytep)png_malloc(png_ptr, - (png_uint_32)(num_palette * png_sizeof(png_byte))); + (png_uint_32)(num_palette * (sizeof (png_byte)))); /* Initialize the sort array */ for (i = 0; i < num_palette; i++) @@ -337,7 +588,7 @@ png_set_quantize(png_structp png_ptr, png_colorp palette, } hash = (png_dsortpp)png_calloc(png_ptr, (png_uint_32)(769 * - png_sizeof(png_dsortp))); + (sizeof (png_dsortp)))); num_new_palette = num_palette; @@ -367,9 +618,11 @@ png_set_quantize(png_structp png_ptr, png_colorp palette, { t = (png_dsortp)png_malloc_warn(png_ptr, - (png_uint_32)(png_sizeof(png_dsort))); + (png_uint_32)(sizeof (png_dsort))); + if (t == NULL) break; + t->next = hash[d]; t->left = (png_byte)i; t->right = (png_byte)j; @@ -390,9 +643,9 @@ png_set_quantize(png_structp png_ptr, png_colorp palette, for (p = hash[i]; p; p = p->next) { if ((int)png_ptr->index_to_palette[p->left] - < num_new_palette && - (int)png_ptr->index_to_palette[p->right] - < num_new_palette) + < num_new_palette && + (int)png_ptr->index_to_palette[p->right] + < num_new_palette) { int j, next_j; @@ -409,7 +662,7 @@ png_set_quantize(png_structp png_ptr, png_colorp palette, num_new_palette--; palette[png_ptr->index_to_palette[j]] - = palette[num_new_palette]; + = palette[num_new_palette]; if (!full_quantize) { int k; @@ -417,23 +670,26 @@ png_set_quantize(png_structp png_ptr, png_colorp palette, for (k = 0; k < num_palette; k++) { if (png_ptr->quantize_index[k] == - png_ptr->index_to_palette[j]) + png_ptr->index_to_palette[j]) png_ptr->quantize_index[k] = - png_ptr->index_to_palette[next_j]; + png_ptr->index_to_palette[next_j]; + if ((int)png_ptr->quantize_index[k] == - num_new_palette) + num_new_palette) png_ptr->quantize_index[k] = - png_ptr->index_to_palette[j]; + png_ptr->index_to_palette[j]; } } png_ptr->index_to_palette[png_ptr->palette_to_index - [num_new_palette]] = png_ptr->index_to_palette[j]; + [num_new_palette]] = png_ptr->index_to_palette[j]; + png_ptr->palette_to_index[png_ptr->index_to_palette[j]] - = png_ptr->palette_to_index[num_new_palette]; + = png_ptr->palette_to_index[num_new_palette]; png_ptr->index_to_palette[j] = (png_byte)num_new_palette; + png_ptr->palette_to_index[num_new_palette] = (png_byte)j; } @@ -480,18 +736,19 @@ png_set_quantize(png_structp png_ptr, png_colorp palette, int i; png_bytep distance; int total_bits = PNG_QUANTIZE_RED_BITS + PNG_QUANTIZE_GREEN_BITS + - PNG_QUANTIZE_BLUE_BITS; + PNG_QUANTIZE_BLUE_BITS; int num_red = (1 << PNG_QUANTIZE_RED_BITS); int num_green = (1 << PNG_QUANTIZE_GREEN_BITS); int num_blue = (1 << PNG_QUANTIZE_BLUE_BITS); png_size_t num_entries = ((png_size_t)1 << total_bits); - png_ptr->palette_lookup = (png_bytep )png_calloc(png_ptr, - (png_uint_32)(num_entries * png_sizeof(png_byte))); + png_ptr->palette_lookup = (png_bytep)png_calloc(png_ptr, + (png_uint_32)(num_entries * (sizeof (png_byte)))); distance = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_entries * - png_sizeof(png_byte))); - png_memset(distance, 0xff, num_entries * png_sizeof(png_byte)); + (sizeof (png_byte)))); + + memset(distance, 0xff, num_entries * (sizeof (png_byte))); for (i = 0; i < num_palette; i++) { @@ -538,32 +795,55 @@ png_set_quantize(png_structp png_ptr, png_colorp palette, } #endif /* PNG_READ_QUANTIZE_SUPPORTED */ -#if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) -/* Transform the image from the file_gamma to the screen_gamma. We - * only do transformations on images where the file_gamma and screen_gamma - * are not close reciprocals, otherwise it slows things down slightly, and - * also needlessly introduces small errors. - * - * We will turn off gamma transformation later if no semitransparent entries - * are present in the tRNS array for palette images. We can't do it here - * because we don't necessarily have the tRNS chunk yet. - */ -void PNGAPI -png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma) +#ifdef PNG_READ_GAMMA_SUPPORTED +void PNGFAPI +png_set_gamma_fixed(png_structrp png_ptr, png_fixed_point scrn_gamma, + png_fixed_point file_gamma) { - png_debug(1, "in png_set_gamma"); + png_debug(1, "in png_set_gamma_fixed"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; - if ((fabs(scrn_gamma * file_gamma - 1.0) > PNG_GAMMA_THRESHOLD) || - (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) || - (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)) - png_ptr->transformations |= PNG_GAMMA; - png_ptr->gamma = (float)file_gamma; - png_ptr->screen_gamma = (float)scrn_gamma; + /* New in libpng-1.5.4 - reserve particular negative values as flags. */ + scrn_gamma = translate_gamma_flags(png_ptr, scrn_gamma, 1/*screen*/); + file_gamma = translate_gamma_flags(png_ptr, file_gamma, 0/*file*/); + + /* Checking the gamma values for being >0 was added in 1.5.4 along with the + * premultiplied alpha support; this actually hides an undocumented feature + * of the previous implementation which allowed gamma processing to be + * disabled in background handling. There is no evidence (so far) that this + * was being used; however, png_set_background itself accepted and must still + * accept '0' for the gamma value it takes, because it isn't always used. + * + * Since this is an API change (albeit a very minor one that removes an + * undocumented API feature) the following checks were only enabled in + * libpng-1.6.0. + */ + if (file_gamma <= 0) + png_error(png_ptr, "invalid file gamma in png_set_gamma"); + + if (scrn_gamma <= 0) + png_error(png_ptr, "invalid screen gamma in png_set_gamma"); + + /* Set the gamma values unconditionally - this overrides the value in the PNG + * file if a gAMA chunk was present. png_set_alpha_mode provides a + * different, easier, way to default the file gamma. + */ + png_ptr->colorspace.gamma = file_gamma; + png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA; + png_ptr->screen_gamma = scrn_gamma; } -#endif + +# ifdef PNG_FLOATING_POINT_SUPPORTED +void PNGAPI +png_set_gamma(png_structrp png_ptr, double scrn_gamma, double file_gamma) +{ + png_set_gamma_fixed(png_ptr, convert_gamma_value(png_ptr, scrn_gamma), + convert_gamma_value(png_ptr, file_gamma)); +} +# endif /* FLOATING_POINT_SUPPORTED */ +#endif /* READ_GAMMA */ #ifdef PNG_READ_EXPAND_SUPPORTED /* Expand paletted images to RGB, expand grayscale images of @@ -571,15 +851,14 @@ png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma) * to alpha channels. */ void PNGAPI -png_set_expand(png_structp png_ptr) +png_set_expand(png_structrp png_ptr) { png_debug(1, "in png_set_expand"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS); - png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } /* GRR 19990627: the following three functions currently are identical @@ -602,143 +881,183 @@ png_set_expand(png_structp png_ptr) /* Expand paletted images to RGB. */ void PNGAPI -png_set_palette_to_rgb(png_structp png_ptr) +png_set_palette_to_rgb(png_structrp png_ptr) { png_debug(1, "in png_set_palette_to_rgb"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS); - png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } /* Expand grayscale images of less than 8-bit depth to 8 bits. */ void PNGAPI -png_set_expand_gray_1_2_4_to_8(png_structp png_ptr) +png_set_expand_gray_1_2_4_to_8(png_structrp png_ptr) { png_debug(1, "in png_set_expand_gray_1_2_4_to_8"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; png_ptr->transformations |= PNG_EXPAND; - png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } - - /* Expand tRNS chunks to alpha channels. */ void PNGAPI -png_set_tRNS_to_alpha(png_structp png_ptr) +png_set_tRNS_to_alpha(png_structrp png_ptr) { png_debug(1, "in png_set_tRNS_to_alpha"); + if (!png_rtran_ok(png_ptr, 0)) + return; + png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS); - png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } #endif /* defined(PNG_READ_EXPAND_SUPPORTED) */ +#ifdef PNG_READ_EXPAND_16_SUPPORTED +/* Expand to 16-bit channels, expand the tRNS chunk too (because otherwise + * it may not work correctly.) + */ +void PNGAPI +png_set_expand_16(png_structrp png_ptr) +{ + png_debug(1, "in png_set_expand_16"); + + if (!png_rtran_ok(png_ptr, 0)) + return; + + png_ptr->transformations |= (PNG_EXPAND_16 | PNG_EXPAND | PNG_EXPAND_tRNS); +} +#endif + #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED void PNGAPI -png_set_gray_to_rgb(png_structp png_ptr) +png_set_gray_to_rgb(png_structrp png_ptr) { png_debug(1, "in png_set_gray_to_rgb"); + if (!png_rtran_ok(png_ptr, 0)) + return; + + /* Because rgb must be 8 bits or more: */ + png_set_expand_gray_1_2_4_to_8(png_ptr); png_ptr->transformations |= PNG_GRAY_TO_RGB; - png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } #endif #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED +void PNGFAPI +png_set_rgb_to_gray_fixed(png_structrp png_ptr, int error_action, + png_fixed_point red, png_fixed_point green) +{ + png_debug(1, "in png_set_rgb_to_gray"); + + /* Need the IHDR here because of the check on color_type below. */ + /* TODO: fix this */ + if (!png_rtran_ok(png_ptr, 1)) + return; + + switch(error_action) + { + case PNG_ERROR_ACTION_NONE: + png_ptr->transformations |= PNG_RGB_TO_GRAY; + break; + + case PNG_ERROR_ACTION_WARN: + png_ptr->transformations |= PNG_RGB_TO_GRAY_WARN; + break; + + case PNG_ERROR_ACTION_ERROR: + png_ptr->transformations |= PNG_RGB_TO_GRAY_ERR; + break; + + default: + png_error(png_ptr, "invalid error action to rgb_to_gray"); + break; + } + + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) +#ifdef PNG_READ_EXPAND_SUPPORTED + png_ptr->transformations |= PNG_EXPAND; +#else + { + /* Make this an error in 1.6 because otherwise the application may assume + * that it just worked and get a memory overwrite. + */ + png_error(png_ptr, + "Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED"); + + /* png_ptr->transformations &= ~PNG_RGB_TO_GRAY; */ + } +#endif + { + if (red >= 0 && green >= 0 && red + green <= PNG_FP_1) + { + png_uint_16 red_int, green_int; + + /* NOTE: this calculation does not round, but this behavior is retained + * for consistency, the inaccuracy is very small. The code here always + * overwrites the coefficients, regardless of whether they have been + * defaulted or set already. + */ + red_int = (png_uint_16)(((png_uint_32)red*32768)/100000); + green_int = (png_uint_16)(((png_uint_32)green*32768)/100000); + + png_ptr->rgb_to_gray_red_coeff = red_int; + png_ptr->rgb_to_gray_green_coeff = green_int; + png_ptr->rgb_to_gray_coefficients_set = 1; + } + + else + { + if (red >= 0 && green >= 0) + png_app_warning(png_ptr, + "ignoring out of range rgb_to_gray coefficients"); + + /* Use the defaults, from the cHRM chunk if set, else the historical + * values which are close to the sRGB/HDTV/ITU-Rec 709 values. See + * png_do_rgb_to_gray for more discussion of the values. In this case + * the coefficients are not marked as 'set' and are not overwritten if + * something has already provided a default. + */ + if (png_ptr->rgb_to_gray_red_coeff == 0 && + png_ptr->rgb_to_gray_green_coeff == 0) + { + png_ptr->rgb_to_gray_red_coeff = 6968; + png_ptr->rgb_to_gray_green_coeff = 23434; + /* png_ptr->rgb_to_gray_blue_coeff = 2366; */ + } + } + } +} + #ifdef PNG_FLOATING_POINT_SUPPORTED /* Convert a RGB image to a grayscale of the same width. This allows us, * for example, to convert a 24 bpp RGB image into an 8 bpp grayscale image. */ void PNGAPI -png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red, +png_set_rgb_to_gray(png_structrp png_ptr, int error_action, double red, double green) { - int red_fixed = (int)((float)red*100000.0 + 0.5); - int green_fixed = (int)((float)green*100000.0 + 0.5); - if (png_ptr == NULL) - return; - png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed); + png_set_rgb_to_gray_fixed(png_ptr, error_action, + png_fixed(png_ptr, red, "rgb to gray red coefficient"), + png_fixed(png_ptr, green, "rgb to gray green coefficient")); } -#endif +#endif /* FLOATING POINT */ -void PNGAPI -png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action, - png_fixed_point red, png_fixed_point green) -{ - png_debug(1, "in png_set_rgb_to_gray"); - - if (png_ptr == NULL) - return; - - switch(error_action) - { - case 1: png_ptr->transformations |= PNG_RGB_TO_GRAY; - break; - - case 2: png_ptr->transformations |= PNG_RGB_TO_GRAY_WARN; - break; - - case 3: png_ptr->transformations |= PNG_RGB_TO_GRAY_ERR; - break; - - default: - png_error(png_ptr, "invalid error action in png_set_rgb_to_gray"); - break; - } - if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) -#ifdef PNG_READ_EXPAND_SUPPORTED - png_ptr->transformations |= PNG_EXPAND; -#else - { - png_warning(png_ptr, - "Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED"); - png_ptr->transformations &= ~PNG_RGB_TO_GRAY; - } -#endif - { - png_uint_16 red_int, green_int; - if (red < 0 || green < 0) - { - red_int = 6968; /* .212671 * 32768 + .5 */ - green_int = 23434; /* .715160 * 32768 + .5 */ - } - else if (red + green < 100000L) - { - red_int = (png_uint_16)(((png_uint_32)red*32768L)/100000L); - green_int = (png_uint_16)(((png_uint_32)green*32768L)/100000L); - } - else - { - png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients"); - red_int = 6968; - green_int = 23434; - } - png_ptr->rgb_to_gray_red_coeff = red_int; - png_ptr->rgb_to_gray_green_coeff = green_int; - png_ptr->rgb_to_gray_blue_coeff = - (png_uint_16)(32768 - red_int - green_int); - } -} -#endif +#endif /* RGB_TO_GRAY */ #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) void PNGAPI -png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr - read_user_transform_fn) +png_set_read_user_transform_fn(png_structrp png_ptr, png_user_transform_ptr + read_user_transform_fn) { png_debug(1, "in png_set_read_user_transform_fn"); - if (png_ptr == NULL) - return; - #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED png_ptr->transformations |= PNG_USER_TRANSFORM; png_ptr->read_user_transform_fn = read_user_transform_fn; @@ -746,26 +1065,361 @@ png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr } #endif +#ifdef PNG_READ_TRANSFORMS_SUPPORTED +#ifdef PNG_READ_GAMMA_SUPPORTED +/* In the case of gamma transformations only do transformations on images where + * the [file] gamma and screen_gamma are not close reciprocals, otherwise it + * slows things down slightly, and also needlessly introduces small errors. + */ +static int /* PRIVATE */ +png_gamma_threshold(png_fixed_point screen_gamma, png_fixed_point file_gamma) +{ + /* PNG_GAMMA_THRESHOLD is the threshold for performing gamma + * correction as a difference of the overall transform from 1.0 + * + * We want to compare the threshold with s*f - 1, if we get + * overflow here it is because of wacky gamma values so we + * turn on processing anyway. + */ + png_fixed_point gtest; + return !png_muldiv(>est, screen_gamma, file_gamma, PNG_FP_1) || + png_gamma_significant(gtest); +} +#endif + /* Initialize everything needed for the read. This includes modifying * the palette. */ + +/*For the moment 'png_init_palette_transformations' and + * 'png_init_rgb_transformations' only do some flag canceling optimizations. + * The intent is that these two routines should have palette or rgb operations + * extracted from 'png_init_read_transformations'. + */ +static void /* PRIVATE */ +png_init_palette_transformations(png_structrp png_ptr) +{ + /* Called to handle the (input) palette case. In png_do_read_transformations + * the first step is to expand the palette if requested, so this code must + * take care to only make changes that are invariant with respect to the + * palette expansion, or only do them if there is no expansion. + * + * STRIP_ALPHA has already been handled in the caller (by setting num_trans + * to 0.) + */ + int input_has_alpha = 0; + int input_has_transparency = 0; + + if (png_ptr->num_trans > 0) + { + int i; + + /* Ignore if all the entries are opaque (unlikely!) */ + for (i=0; inum_trans; ++i) + { + if (png_ptr->trans_alpha[i] == 255) + continue; + else if (png_ptr->trans_alpha[i] == 0) + input_has_transparency = 1; + else + { + input_has_transparency = 1; + input_has_alpha = 1; + break; + } + } + } + + /* If no alpha we can optimize. */ + if (!input_has_alpha) + { + /* Any alpha means background and associative alpha processing is + * required, however if the alpha is 0 or 1 throughout OPTIIMIZE_ALPHA + * and ENCODE_ALPHA are irrelevant. + */ + png_ptr->transformations &= ~PNG_ENCODE_ALPHA; + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; + + if (!input_has_transparency) + png_ptr->transformations &= ~(PNG_COMPOSE | PNG_BACKGROUND_EXPAND); + } + +#if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED) + /* png_set_background handling - deals with the complexity of whether the + * background color is in the file format or the screen format in the case + * where an 'expand' will happen. + */ + + /* The following code cannot be entered in the alpha pre-multiplication case + * because PNG_BACKGROUND_EXPAND is cancelled below. + */ + if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) && + (png_ptr->transformations & PNG_EXPAND)) + { + { + png_ptr->background.red = + png_ptr->palette[png_ptr->background.index].red; + png_ptr->background.green = + png_ptr->palette[png_ptr->background.index].green; + png_ptr->background.blue = + png_ptr->palette[png_ptr->background.index].blue; + +#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED + if (png_ptr->transformations & PNG_INVERT_ALPHA) + { + if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) + { + /* Invert the alpha channel (in tRNS) unless the pixels are + * going to be expanded, in which case leave it for later + */ + int i, istop = png_ptr->num_trans; + + for (i=0; itrans_alpha[i] = (png_byte)(255 - + png_ptr->trans_alpha[i]); + } + } +#endif /* PNG_READ_INVERT_ALPHA_SUPPORTED */ + } + } /* background expand and (therefore) no alpha association. */ +#endif /* PNG_READ_EXPAND_SUPPORTED && PNG_READ_BACKGROUND_SUPPORTED */ +} + +static void /* PRIVATE */ +png_init_rgb_transformations(png_structrp png_ptr) +{ + /* Added to libpng-1.5.4: check the color type to determine whether there + * is any alpha or transparency in the image and simply cancel the + * background and alpha mode stuff if there isn't. + */ + int input_has_alpha = (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0; + int input_has_transparency = png_ptr->num_trans > 0; + + /* If no alpha we can optimize. */ + if (!input_has_alpha) + { + /* Any alpha means background and associative alpha processing is + * required, however if the alpha is 0 or 1 throughout OPTIIMIZE_ALPHA + * and ENCODE_ALPHA are irrelevant. + */ +# ifdef PNG_READ_ALPHA_MODE_SUPPORTED + png_ptr->transformations &= ~PNG_ENCODE_ALPHA; + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; +# endif + + if (!input_has_transparency) + png_ptr->transformations &= ~(PNG_COMPOSE | PNG_BACKGROUND_EXPAND); + } + +#if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED) + /* png_set_background handling - deals with the complexity of whether the + * background color is in the file format or the screen format in the case + * where an 'expand' will happen. + */ + + /* The following code cannot be entered in the alpha pre-multiplication case + * because PNG_BACKGROUND_EXPAND is cancelled below. + */ + if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) && + (png_ptr->transformations & PNG_EXPAND) && + !(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) + /* i.e., GRAY or GRAY_ALPHA */ + { + { + /* Expand background and tRNS chunks */ + int gray = png_ptr->background.gray; + int trans_gray = png_ptr->trans_color.gray; + + switch (png_ptr->bit_depth) + { + case 1: + gray *= 0xff; + trans_gray *= 0xff; + break; + + case 2: + gray *= 0x55; + trans_gray *= 0x55; + break; + + case 4: + gray *= 0x11; + trans_gray *= 0x11; + break; + + default: + + case 8: + /* FALL THROUGH (Already 8 bits) */ + + case 16: + /* Already a full 16 bits */ + break; + } + + png_ptr->background.red = png_ptr->background.green = + png_ptr->background.blue = (png_uint_16)gray; + + if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) + { + png_ptr->trans_color.red = png_ptr->trans_color.green = + png_ptr->trans_color.blue = (png_uint_16)trans_gray; + } + } + } /* background expand and (therefore) no alpha association. */ +#endif /* PNG_READ_EXPAND_SUPPORTED && PNG_READ_BACKGROUND_SUPPORTED */ +} + void /* PRIVATE */ -png_init_read_transformations(png_structp png_ptr) +png_init_read_transformations(png_structrp png_ptr) { png_debug(1, "in png_init_read_transformations"); - { -#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ - defined(PNG_READ_SHIFT_SUPPORTED) || \ - defined(PNG_READ_GAMMA_SUPPORTED) - int color_type = png_ptr->color_type; + /* This internal function is called from png_read_start_row in pngrutil.c + * and it is called before the 'rowbytes' calculation is done, so the code + * in here can change or update the transformations flags. + * + * First do updates that do not depend on the details of the PNG image data + * being processed. + */ + +#ifdef PNG_READ_GAMMA_SUPPORTED + /* Prior to 1.5.4 these tests were performed from png_set_gamma, 1.5.4 adds + * png_set_alpha_mode and this is another source for a default file gamma so + * the test needs to be performed later - here. In addition prior to 1.5.4 + * the tests were repeated for the PALETTE color type here - this is no + * longer necessary (and doesn't seem to have been necessary before.) + */ + { + /* The following temporary indicates if overall gamma correction is + * required. + */ + int gamma_correction = 0; + + if (png_ptr->colorspace.gamma != 0) /* has been set */ + { + if (png_ptr->screen_gamma != 0) /* screen set too */ + gamma_correction = png_gamma_threshold(png_ptr->colorspace.gamma, + png_ptr->screen_gamma); + + else + /* Assume the output matches the input; a long time default behavior + * of libpng, although the standard has nothing to say about this. + */ + png_ptr->screen_gamma = png_reciprocal(png_ptr->colorspace.gamma); + } + + else if (png_ptr->screen_gamma != 0) + /* The converse - assume the file matches the screen, note that this + * perhaps undesireable default can (from 1.5.4) be changed by calling + * png_set_alpha_mode (even if the alpha handling mode isn't required + * or isn't changed from the default.) + */ + png_ptr->colorspace.gamma = png_reciprocal(png_ptr->screen_gamma); + + else /* neither are set */ + /* Just in case the following prevents any processing - file and screen + * are both assumed to be linear and there is no way to introduce a + * third gamma value other than png_set_background with 'UNIQUE', and, + * prior to 1.5.4 + */ + png_ptr->screen_gamma = png_ptr->colorspace.gamma = PNG_FP_1; + + /* We have a gamma value now. */ + png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA; + + /* Now turn the gamma transformation on or off as appropriate. Notice + * that PNG_GAMMA just refers to the file->screen correction. Alpha + * composition may independently cause gamma correction because it needs + * linear data (e.g. if the file has a gAMA chunk but the screen gamma + * hasn't been specified.) In any case this flag may get turned off in + * the code immediately below if the transform can be handled outside the + * row loop. + */ + if (gamma_correction) + png_ptr->transformations |= PNG_GAMMA; + + else + png_ptr->transformations &= ~PNG_GAMMA; + } #endif -#if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED) + /* Certain transformations have the effect of preventing other + * transformations that happen afterward in png_do_read_transformations, + * resolve the interdependencies here. From the code of + * png_do_read_transformations the order is: + * + * 1) PNG_EXPAND (including PNG_EXPAND_tRNS) + * 2) PNG_STRIP_ALPHA (if no compose) + * 3) PNG_RGB_TO_GRAY + * 4) PNG_GRAY_TO_RGB iff !PNG_BACKGROUND_IS_GRAY + * 5) PNG_COMPOSE + * 6) PNG_GAMMA + * 7) PNG_STRIP_ALPHA (if compose) + * 8) PNG_ENCODE_ALPHA + * 9) PNG_SCALE_16_TO_8 + * 10) PNG_16_TO_8 + * 11) PNG_QUANTIZE (converts to palette) + * 12) PNG_EXPAND_16 + * 13) PNG_GRAY_TO_RGB iff PNG_BACKGROUND_IS_GRAY + * 14) PNG_INVERT_MONO + * 15) PNG_SHIFT + * 16) PNG_PACK + * 17) PNG_BGR + * 18) PNG_PACKSWAP + * 19) PNG_FILLER (includes PNG_ADD_ALPHA) + * 20) PNG_INVERT_ALPHA + * 21) PNG_SWAP_ALPHA + * 22) PNG_SWAP_BYTES + * 23) PNG_USER_TRANSFORM [must be last] + */ +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED + if ((png_ptr->transformations & PNG_STRIP_ALPHA) && + !(png_ptr->transformations & PNG_COMPOSE)) + { + /* Stripping the alpha channel happens immediately after the 'expand' + * transformations, before all other transformation, so it cancels out + * the alpha handling. It has the side effect negating the effect of + * PNG_EXPAND_tRNS too: + */ + png_ptr->transformations &= ~(PNG_BACKGROUND_EXPAND | PNG_ENCODE_ALPHA | + PNG_EXPAND_tRNS); + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; + + /* Kill the tRNS chunk itself too. Prior to 1.5.4 this did not happen + * so transparency information would remain just so long as it wasn't + * expanded. This produces unexpected API changes if the set of things + * that do PNG_EXPAND_tRNS changes (perfectly possible given the + * documentation - which says ask for what you want, accept what you + * get.) This makes the behavior consistent from 1.5.4: + */ + png_ptr->num_trans = 0; + } +#endif /* STRIP_ALPHA supported, no COMPOSE */ + +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED + /* If the screen gamma is about 1.0 then the OPTIMIZE_ALPHA and ENCODE_ALPHA + * settings will have no effect. + */ + if (!png_gamma_significant(png_ptr->screen_gamma)) + { + png_ptr->transformations &= ~PNG_ENCODE_ALPHA; + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; + } +#endif + +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED + /* Make sure the coefficients for the rgb to gray conversion are set + * appropriately. + */ + if (png_ptr->transformations & PNG_RGB_TO_GRAY) + png_colorspace_set_rgb_coefficients(png_ptr); +#endif #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED - /* Detect gray background and attempt to enable optimization - * for gray --> RGB case +#if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED) + /* Detect gray background and attempt to enable optimization for + * gray --> RGB case. * * Note: if PNG_BACKGROUND_EXPAND is set and color_type is either RGB or * RGB_ALPHA (in which case need_expand is superfluous anyway), the @@ -773,144 +1427,175 @@ png_init_read_transformations(png_structp png_ptr) * This is not a problem for the current code, which uses * PNG_BACKGROUND_IS_GRAY only to decide when to do the * png_do_gray_to_rgb() transformation. + * + * TODO: this code needs to be revised to avoid the complexity and + * interdependencies. The color type of the background should be recorded in + * png_set_background, along with the bit depth, then the code has a record + * of exactly what color space the background is currently in. */ - if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) && - !(color_type & PNG_COLOR_MASK_COLOR)) + if (png_ptr->transformations & PNG_BACKGROUND_EXPAND) { - png_ptr->mode |= PNG_BACKGROUND_IS_GRAY; - } else if ((png_ptr->transformations & PNG_BACKGROUND) && - !(png_ptr->transformations & PNG_BACKGROUND_EXPAND) && - (png_ptr->transformations & PNG_GRAY_TO_RGB) && - png_ptr->background.red == png_ptr->background.green && - png_ptr->background.red == png_ptr->background.blue) - { - png_ptr->mode |= PNG_BACKGROUND_IS_GRAY; - png_ptr->background.gray = png_ptr->background.red; + /* PNG_BACKGROUND_EXPAND: the background is in the file color space, so if + * the file was grayscale the background value is gray. + */ + if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) + png_ptr->mode |= PNG_BACKGROUND_IS_GRAY; } -#endif - if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) && - (png_ptr->transformations & PNG_EXPAND)) + else if (png_ptr->transformations & PNG_COMPOSE) { - if (!(color_type & PNG_COLOR_MASK_COLOR)) /* i.e., GRAY or GRAY_ALPHA */ + /* PNG_COMPOSE: png_set_background was called with need_expand false, + * so the color is in the color space of the output or png_set_alpha_mode + * was called and the color is black. Ignore RGB_TO_GRAY because that + * happens before GRAY_TO_RGB. + */ + if (png_ptr->transformations & PNG_GRAY_TO_RGB) { - /* Expand background and tRNS chunks */ - switch (png_ptr->bit_depth) + if (png_ptr->background.red == png_ptr->background.green && + png_ptr->background.red == png_ptr->background.blue) { - case 1: - png_ptr->background.gray *= (png_uint_16)0xff; - png_ptr->background.red = png_ptr->background.green - = png_ptr->background.blue = png_ptr->background.gray; - if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) - { - png_ptr->trans_color.gray *= (png_uint_16)0xff; - png_ptr->trans_color.red = png_ptr->trans_color.green - = png_ptr->trans_color.blue = png_ptr->trans_color.gray; - } - break; - - case 2: - png_ptr->background.gray *= (png_uint_16)0x55; - png_ptr->background.red = png_ptr->background.green - = png_ptr->background.blue = png_ptr->background.gray; - if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) - { - png_ptr->trans_color.gray *= (png_uint_16)0x55; - png_ptr->trans_color.red = png_ptr->trans_color.green - = png_ptr->trans_color.blue = png_ptr->trans_color.gray; - } - break; - - case 4: - png_ptr->background.gray *= (png_uint_16)0x11; - png_ptr->background.red = png_ptr->background.green - = png_ptr->background.blue = png_ptr->background.gray; - if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) - { - png_ptr->trans_color.gray *= (png_uint_16)0x11; - png_ptr->trans_color.red = png_ptr->trans_color.green - = png_ptr->trans_color.blue = png_ptr->trans_color.gray; - } - break; - - default: - - case 8: - - case 16: - png_ptr->background.red = png_ptr->background.green - = png_ptr->background.blue = png_ptr->background.gray; - break; + png_ptr->mode |= PNG_BACKGROUND_IS_GRAY; + png_ptr->background.gray = png_ptr->background.red; } } - else if (color_type == PNG_COLOR_TYPE_PALETTE) - { - png_ptr->background.red = - png_ptr->palette[png_ptr->background.index].red; - png_ptr->background.green = - png_ptr->palette[png_ptr->background.index].green; - png_ptr->background.blue = - png_ptr->palette[png_ptr->background.index].blue; - -#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED - if (png_ptr->transformations & PNG_INVERT_ALPHA) - { -#ifdef PNG_READ_EXPAND_SUPPORTED - if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) -#endif - { - /* Invert the alpha channel (in tRNS) unless the pixels are - * going to be expanded, in which case leave it for later - */ - int i, istop; - istop=(int)png_ptr->num_trans; - for (i=0; itrans_alpha[i] = (png_byte)(255 - png_ptr->trans_alpha[i]); - } - } -#endif - - } } -#endif +#endif /* PNG_READ_EXPAND_SUPPORTED && PNG_READ_BACKGROUND_SUPPORTED */ +#endif /* PNG_READ_GRAY_TO_RGB_SUPPORTED */ -#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED) - png_ptr->background_1 = png_ptr->background; -#endif -#if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) + /* For indexed PNG data (PNG_COLOR_TYPE_PALETTE) many of the transformations + * can be performed directly on the palette, and some (such as rgb to gray) + * can be optimized inside the palette. This is particularly true of the + * composite (background and alpha) stuff, which can be pretty much all done + * in the palette even if the result is expanded to RGB or gray afterward. + * + * NOTE: this is Not Yet Implemented, the code behaves as in 1.5.1 and + * earlier and the palette stuff is actually handled on the first row. This + * leads to the reported bug that the palette returned by png_get_PLTE is not + * updated. + */ + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + png_init_palette_transformations(png_ptr); - if ((color_type == PNG_COLOR_TYPE_PALETTE && png_ptr->num_trans != 0) - && (fabs(png_ptr->screen_gamma * png_ptr->gamma - 1.0) - < PNG_GAMMA_THRESHOLD)) + else + png_init_rgb_transformations(png_ptr); + +#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \ + defined(PNG_READ_EXPAND_16_SUPPORTED) + if ((png_ptr->transformations & PNG_EXPAND_16) && + (png_ptr->transformations & PNG_COMPOSE) && + !(png_ptr->transformations & PNG_BACKGROUND_EXPAND) && + png_ptr->bit_depth != 16) { - int i, k; - k=0; - for (i=0; inum_trans; i++) - { - if (png_ptr->trans_alpha[i] != 0 && png_ptr->trans_alpha[i] != 0xff) - k=1; /* Partial transparency is present */ - } - if (k == 0) - png_ptr->transformations &= ~PNG_GAMMA; + /* TODO: fix this. Because the expand_16 operation is after the compose + * handling the background color must be 8, not 16, bits deep, but the + * application will supply a 16-bit value so reduce it here. + * + * The PNG_BACKGROUND_EXPAND code above does not expand to 16 bits at + * present, so that case is ok (until do_expand_16 is moved.) + * + * NOTE: this discards the low 16 bits of the user supplied background + * color, but until expand_16 works properly there is no choice! + */ +# define CHOP(x) (x)=((png_uint_16)PNG_DIV257(x)) + CHOP(png_ptr->background.red); + CHOP(png_ptr->background.green); + CHOP(png_ptr->background.blue); + CHOP(png_ptr->background.gray); +# undef CHOP } +#endif /* PNG_READ_BACKGROUND_SUPPORTED && PNG_READ_EXPAND_16_SUPPORTED */ - if ((png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY)) && - png_ptr->gamma != 0.0) +#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \ + (defined(PNG_READ_SCALE_16_TO_8_SUPPORTED) || \ + defined(PNG_READ_STRIP_16_TO_8_SUPPORTED)) + if ((png_ptr->transformations & (PNG_16_TO_8|PNG_SCALE_16_TO_8)) && + (png_ptr->transformations & PNG_COMPOSE) && + !(png_ptr->transformations & PNG_BACKGROUND_EXPAND) && + png_ptr->bit_depth == 16) + { + /* On the other hand, if a 16-bit file is to be reduced to 8-bits per + * component this will also happen after PNG_COMPOSE and so the background + * color must be pre-expanded here. + * + * TODO: fix this too. + */ + png_ptr->background.red = (png_uint_16)(png_ptr->background.red * 257); + png_ptr->background.green = + (png_uint_16)(png_ptr->background.green * 257); + png_ptr->background.blue = (png_uint_16)(png_ptr->background.blue * 257); + png_ptr->background.gray = (png_uint_16)(png_ptr->background.gray * 257); + } +#endif + + /* NOTE: below 'PNG_READ_ALPHA_MODE_SUPPORTED' is presumed to also enable the + * background support (see the comments in scripts/pnglibconf.dfa), this + * allows pre-multiplication of the alpha channel to be implemented as + * compositing on black. This is probably sub-optimal and has been done in + * 1.5.4 betas simply to enable external critique and testing (i.e. to + * implement the new API quickly, without lots of internal changes.) + */ + +#ifdef PNG_READ_GAMMA_SUPPORTED +# ifdef PNG_READ_BACKGROUND_SUPPORTED + /* Includes ALPHA_MODE */ + png_ptr->background_1 = png_ptr->background; +# endif + + /* This needs to change - in the palette image case a whole set of tables are + * built when it would be quicker to just calculate the correct value for + * each palette entry directly. Also, the test is too tricky - why check + * PNG_RGB_TO_GRAY if PNG_GAMMA is not set? The answer seems to be that + * PNG_GAMMA is cancelled even if the gamma is known? The test excludes the + * PNG_COMPOSE case, so apparently if there is no *overall* gamma correction + * the gamma tables will not be built even if composition is required on a + * gamma encoded value. + * + * In 1.5.4 this is addressed below by an additional check on the individual + * file gamma - if it is not 1.0 both RGB_TO_GRAY and COMPOSE need the + * tables. + */ + if ((png_ptr->transformations & PNG_GAMMA) + || ((png_ptr->transformations & PNG_RGB_TO_GRAY) + && (png_gamma_significant(png_ptr->colorspace.gamma) || + png_gamma_significant(png_ptr->screen_gamma))) + || ((png_ptr->transformations & PNG_COMPOSE) + && (png_gamma_significant(png_ptr->colorspace.gamma) + || png_gamma_significant(png_ptr->screen_gamma) +# ifdef PNG_READ_BACKGROUND_SUPPORTED + || (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_UNIQUE + && png_gamma_significant(png_ptr->background_gamma)) +# endif + )) || ((png_ptr->transformations & PNG_ENCODE_ALPHA) + && png_gamma_significant(png_ptr->screen_gamma)) + ) { png_build_gamma_table(png_ptr, png_ptr->bit_depth); #ifdef PNG_READ_BACKGROUND_SUPPORTED - if (png_ptr->transformations & PNG_BACKGROUND) + if (png_ptr->transformations & PNG_COMPOSE) { - if (color_type == PNG_COLOR_TYPE_PALETTE) + /* Issue a warning about this combination: because RGB_TO_GRAY is + * optimized to do the gamma transform if present yet do_background has + * to do the same thing if both options are set a + * double-gamma-correction happens. This is true in all versions of + * libpng to date. + */ + if (png_ptr->transformations & PNG_RGB_TO_GRAY) + png_warning(png_ptr, + "libpng does not support gamma+background+rgb_to_gray"); + + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { - /* Could skip if no transparency */ + /* We don't get to here unless there is a tRNS chunk with non-opaque + * entries - see the checking code at the start of this function. + */ png_color back, back_1; png_colorp palette = png_ptr->palette; int num_palette = png_ptr->num_palette; int i; if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE) { + back.red = png_ptr->gamma_table[png_ptr->background.red]; back.green = png_ptr->gamma_table[png_ptr->background.green]; back.blue = png_ptr->gamma_table[png_ptr->background.blue]; @@ -921,57 +1606,71 @@ png_init_read_transformations(png_structp png_ptr) } else { - double g, gs; + png_fixed_point g, gs; switch (png_ptr->background_gamma_type) { case PNG_BACKGROUND_GAMMA_SCREEN: g = (png_ptr->screen_gamma); - gs = 1.0; + gs = PNG_FP_1; break; case PNG_BACKGROUND_GAMMA_FILE: - g = 1.0 / (png_ptr->gamma); - gs = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma); + g = png_reciprocal(png_ptr->colorspace.gamma); + gs = png_reciprocal2(png_ptr->colorspace.gamma, + png_ptr->screen_gamma); break; case PNG_BACKGROUND_GAMMA_UNIQUE: - g = 1.0 / (png_ptr->background_gamma); - gs = 1.0 / (png_ptr->background_gamma * - png_ptr->screen_gamma); + g = png_reciprocal(png_ptr->background_gamma); + gs = png_reciprocal2(png_ptr->background_gamma, + png_ptr->screen_gamma); break; default: - g = 1.0; /* back_1 */ - gs = 1.0; /* back */ + g = PNG_FP_1; /* back_1 */ + gs = PNG_FP_1; /* back */ + break; } - if ( fabs(gs - 1.0) < PNG_GAMMA_THRESHOLD) + if (png_gamma_significant(gs)) + { + back.red = png_gamma_8bit_correct(png_ptr->background.red, + gs); + back.green = png_gamma_8bit_correct(png_ptr->background.green, + gs); + back.blue = png_gamma_8bit_correct(png_ptr->background.blue, + gs); + } + + else { back.red = (png_byte)png_ptr->background.red; back.green = (png_byte)png_ptr->background.green; back.blue = (png_byte)png_ptr->background.blue; } - else + + if (png_gamma_significant(g)) { - back.red = (png_byte)(pow( - (double)png_ptr->background.red/255.0, gs) * 255.0 + .5); - back.green = (png_byte)(pow( - (double)png_ptr->background.green/255.0, gs) * 255.0 - + .5); - back.blue = (png_byte)(pow( - (double)png_ptr->background.blue/255.0, gs) * 255.0 + .5); + back_1.red = png_gamma_8bit_correct(png_ptr->background.red, + g); + back_1.green = png_gamma_8bit_correct( + png_ptr->background.green, g); + back_1.blue = png_gamma_8bit_correct(png_ptr->background.blue, + g); } - back_1.red = (png_byte)(pow( - (double)png_ptr->background.red/255.0, g) * 255.0 + .5); - back_1.green = (png_byte)(pow( - (double)png_ptr->background.green/255.0, g) * 255.0 + .5); - back_1.blue = (png_byte)(pow( - (double)png_ptr->background.blue/255.0, g) * 255.0 + .5); + else + { + back_1.red = (png_byte)png_ptr->background.red; + back_1.green = (png_byte)png_ptr->background.green; + back_1.blue = (png_byte)png_ptr->background.blue; + } } + for (i = 0; i < num_palette; i++) { - if (i < (int)png_ptr->num_trans && png_ptr->trans_alpha[i] != 0xff) + if (i < (int)png_ptr->num_trans && + png_ptr->trans_alpha[i] != 0xff) { if (png_ptr->trans_alpha[i] == 0) { @@ -1001,87 +1700,120 @@ png_init_read_transformations(png_structp png_ptr) palette[i].blue = png_ptr->gamma_table[palette[i].blue]; } } - /* Prevent the transformations being done again, and make sure - * that the now spurious alpha channel is stripped - the code - * has just reduced background composition and gamma correction - * to a simple alpha channel strip. + + /* Prevent the transformations being done again. + * + * NOTE: this is highly dubious; it removes the transformations in + * place. This seems inconsistent with the general treatment of the + * transformations elsewhere. */ - png_ptr->transformations &= ~PNG_BACKGROUND; - png_ptr->transformations &= ~PNG_GAMMA; - png_ptr->flags |= PNG_FLAG_STRIP_ALPHA; - } + png_ptr->transformations &= ~(PNG_COMPOSE | PNG_GAMMA); + } /* color_type == PNG_COLOR_TYPE_PALETTE */ + /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */ - else - /* color_type != PNG_COLOR_TYPE_PALETTE */ + else /* color_type != PNG_COLOR_TYPE_PALETTE */ { - double m = (double)(((png_uint_32)1 << png_ptr->bit_depth) - 1); - double g = 1.0; - double gs = 1.0; + int gs_sig, g_sig; + png_fixed_point g = PNG_FP_1; /* Correction to linear */ + png_fixed_point gs = PNG_FP_1; /* Correction to screen */ switch (png_ptr->background_gamma_type) { case PNG_BACKGROUND_GAMMA_SCREEN: - g = (png_ptr->screen_gamma); - gs = 1.0; + g = png_ptr->screen_gamma; + /* gs = PNG_FP_1; */ break; case PNG_BACKGROUND_GAMMA_FILE: - g = 1.0 / (png_ptr->gamma); - gs = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma); + g = png_reciprocal(png_ptr->colorspace.gamma); + gs = png_reciprocal2(png_ptr->colorspace.gamma, + png_ptr->screen_gamma); break; case PNG_BACKGROUND_GAMMA_UNIQUE: - g = 1.0 / (png_ptr->background_gamma); - gs = 1.0 / (png_ptr->background_gamma * - png_ptr->screen_gamma); + g = png_reciprocal(png_ptr->background_gamma); + gs = png_reciprocal2(png_ptr->background_gamma, + png_ptr->screen_gamma); break; default: png_error(png_ptr, "invalid background gamma type"); } - png_ptr->background_1.gray = (png_uint_16)(pow( - (double)png_ptr->background.gray / m, g) * m + .5); - png_ptr->background.gray = (png_uint_16)(pow( - (double)png_ptr->background.gray / m, gs) * m + .5); + g_sig = png_gamma_significant(g); + gs_sig = png_gamma_significant(gs); + + if (g_sig) + png_ptr->background_1.gray = png_gamma_correct(png_ptr, + png_ptr->background.gray, g); + + if (gs_sig) + png_ptr->background.gray = png_gamma_correct(png_ptr, + png_ptr->background.gray, gs); if ((png_ptr->background.red != png_ptr->background.green) || (png_ptr->background.red != png_ptr->background.blue) || (png_ptr->background.red != png_ptr->background.gray)) { /* RGB or RGBA with color background */ - png_ptr->background_1.red = (png_uint_16)(pow( - (double)png_ptr->background.red / m, g) * m + .5); - png_ptr->background_1.green = (png_uint_16)(pow( - (double)png_ptr->background.green / m, g) * m + .5); - png_ptr->background_1.blue = (png_uint_16)(pow( - (double)png_ptr->background.blue / m, g) * m + .5); - png_ptr->background.red = (png_uint_16)(pow( - (double)png_ptr->background.red / m, gs) * m + .5); - png_ptr->background.green = (png_uint_16)(pow( - (double)png_ptr->background.green / m, gs) * m + .5); - png_ptr->background.blue = (png_uint_16)(pow( - (double)png_ptr->background.blue / m, gs) * m + .5); + if (g_sig) + { + png_ptr->background_1.red = png_gamma_correct(png_ptr, + png_ptr->background.red, g); + + png_ptr->background_1.green = png_gamma_correct(png_ptr, + png_ptr->background.green, g); + + png_ptr->background_1.blue = png_gamma_correct(png_ptr, + png_ptr->background.blue, g); + } + + if (gs_sig) + { + png_ptr->background.red = png_gamma_correct(png_ptr, + png_ptr->background.red, gs); + + png_ptr->background.green = png_gamma_correct(png_ptr, + png_ptr->background.green, gs); + + png_ptr->background.blue = png_gamma_correct(png_ptr, + png_ptr->background.blue, gs); + } } + else { /* GRAY, GRAY ALPHA, RGB, or RGBA with gray background */ png_ptr->background_1.red = png_ptr->background_1.green - = png_ptr->background_1.blue = png_ptr->background_1.gray; + = png_ptr->background_1.blue = png_ptr->background_1.gray; + png_ptr->background.red = png_ptr->background.green - = png_ptr->background.blue = png_ptr->background.gray; + = png_ptr->background.blue = png_ptr->background.gray; } - } - } + + /* The background is now in screen gamma: */ + png_ptr->background_gamma_type = PNG_BACKGROUND_GAMMA_SCREEN; + } /* color_type != PNG_COLOR_TYPE_PALETTE */ + }/* png_ptr->transformations & PNG_BACKGROUND */ + else /* Transformation does not include PNG_BACKGROUND */ #endif /* PNG_READ_BACKGROUND_SUPPORTED */ - if (color_type == PNG_COLOR_TYPE_PALETTE) + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED + /* RGB_TO_GRAY needs to have non-gamma-corrected values! */ + && ((png_ptr->transformations & PNG_EXPAND) == 0 || + (png_ptr->transformations & PNG_RGB_TO_GRAY) == 0) +#endif + ) { png_colorp palette = png_ptr->palette; int num_palette = png_ptr->num_palette; int i; + /* NOTE: there are other transformations that should probably be in + * here too. + */ for (i = 0; i < num_palette; i++) { palette[i].red = png_ptr->gamma_table[palette[i].red]; @@ -1091,16 +1823,17 @@ png_init_read_transformations(png_structp png_ptr) /* Done the gamma correction. */ png_ptr->transformations &= ~PNG_GAMMA; - } + } /* color_type == PALETTE && !PNG_BACKGROUND transformation */ } #ifdef PNG_READ_BACKGROUND_SUPPORTED else #endif -#endif /* PNG_READ_GAMMA_SUPPORTED && PNG_FLOATING_POINT_SUPPORTED */ +#endif /* PNG_READ_GAMMA_SUPPORTED */ + #ifdef PNG_READ_BACKGROUND_SUPPORTED - /* No GAMMA transformation */ - if ((png_ptr->transformations & PNG_BACKGROUND) && - (color_type == PNG_COLOR_TYPE_PALETTE)) + /* No GAMMA transformation (see the hanging else 4 lines above) */ + if ((png_ptr->transformations & PNG_COMPOSE) && + (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)) { int i; int istop = (int)png_ptr->num_trans; @@ -1117,54 +1850,70 @@ png_init_read_transformations(png_structp png_ptr) { palette[i] = back; } + else if (png_ptr->trans_alpha[i] != 0xff) { /* The png_composite() macro is defined in png.h */ png_composite(palette[i].red, palette[i].red, - png_ptr->trans_alpha[i], back.red); + png_ptr->trans_alpha[i], back.red); + png_composite(palette[i].green, palette[i].green, - png_ptr->trans_alpha[i], back.green); + png_ptr->trans_alpha[i], back.green); + png_composite(palette[i].blue, palette[i].blue, - png_ptr->trans_alpha[i], back.blue); + png_ptr->trans_alpha[i], back.blue); } } - /* Handled alpha, still need to strip the channel. */ - png_ptr->transformations &= ~PNG_BACKGROUND; - png_ptr->flags |= PNG_FLAG_STRIP_ALPHA; + png_ptr->transformations &= ~PNG_COMPOSE; } #endif /* PNG_READ_BACKGROUND_SUPPORTED */ #ifdef PNG_READ_SHIFT_SUPPORTED if ((png_ptr->transformations & PNG_SHIFT) && - (color_type == PNG_COLOR_TYPE_PALETTE)) + !(png_ptr->transformations & PNG_EXPAND) && + (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)) { - png_uint_16 i; - png_uint_16 istop = png_ptr->num_palette; - int sr = 8 - png_ptr->sig_bit.red; - int sg = 8 - png_ptr->sig_bit.green; - int sb = 8 - png_ptr->sig_bit.blue; + int i; + int istop = png_ptr->num_palette; + int shift = 8 - png_ptr->sig_bit.red; - if (sr < 0 || sr > 8) - sr = 0; - if (sg < 0 || sg > 8) - sg = 0; - if (sb < 0 || sb > 8) - sb = 0; - for (i = 0; i < istop; i++) - { - png_ptr->palette[i].red >>= sr; - png_ptr->palette[i].green >>= sg; - png_ptr->palette[i].blue >>= sb; - } + png_ptr->transformations &= ~PNG_SHIFT; + + /* significant bits can be in the range 1 to 7 for a meaninful result, if + * the number of significant bits is 0 then no shift is done (this is an + * error condition which is silently ignored.) + */ + if (shift > 0 && shift < 8) + for (i=0; ipalette[i].red; + + component >>= shift; + png_ptr->palette[i].red = (png_byte)component; + } + + shift = 8 - png_ptr->sig_bit.green; + if (shift > 0 && shift < 8) + for (i=0; ipalette[i].green; + + component >>= shift; + png_ptr->palette[i].green = (png_byte)component; + } + + shift = 8 - png_ptr->sig_bit.blue; + if (shift > 0 && shift < 8) + for (i=0; ipalette[i].blue; + + component >>= shift; + png_ptr->palette[i].blue = (png_byte)component; + } } #endif /* PNG_READ_SHIFT_SUPPORTED */ - } -#if !defined(PNG_READ_GAMMA_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) \ - && !defined(PNG_READ_BACKGROUND_SUPPORTED) - if (png_ptr) - return; -#endif } /* Modify the info structure to reflect the transformations. The @@ -1172,7 +1921,7 @@ png_init_read_transformations(png_structp png_ptr) * assuming the transformations result in valid PNG data. */ void /* PRIVATE */ -png_read_transform_info(png_structp png_ptr, png_infop info_ptr) +png_read_transform_info(png_structrp png_ptr, png_inforp info_ptr) { png_debug(1, "in png_read_transform_info"); @@ -1181,11 +1930,16 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) { if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { - if (png_ptr->num_trans && - (png_ptr->transformations & PNG_EXPAND_tRNS)) + /* This check must match what actually happens in + * png_do_expand_palette; if it ever checks the tRNS chunk to see if + * it is all opaque we must do the same (at present it does not.) + */ + if (png_ptr->num_trans > 0) info_ptr->color_type = PNG_COLOR_TYPE_RGB_ALPHA; + else info_ptr->color_type = PNG_COLOR_TYPE_RGB; + info_ptr->bit_depth = 8; info_ptr->num_trans = 0; } @@ -1194,49 +1948,86 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) if (png_ptr->num_trans) { if (png_ptr->transformations & PNG_EXPAND_tRNS) - info_ptr->color_type |= PNG_COLOR_MASK_ALPHA; + info_ptr->color_type |= PNG_COLOR_MASK_ALPHA; } if (info_ptr->bit_depth < 8) info_ptr->bit_depth = 8; + info_ptr->num_trans = 0; } } #endif -#ifdef PNG_READ_BACKGROUND_SUPPORTED - if (png_ptr->transformations & PNG_BACKGROUND) - { - info_ptr->color_type &= ~PNG_COLOR_MASK_ALPHA; - info_ptr->num_trans = 0; +#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ + defined(PNG_READ_ALPHA_MODE_SUPPORTED) + /* The following is almost certainly wrong unless the background value is in + * the screen space! + */ + if (png_ptr->transformations & PNG_COMPOSE) info_ptr->background = png_ptr->background; - } #endif #ifdef PNG_READ_GAMMA_SUPPORTED - if (png_ptr->transformations & PNG_GAMMA) - { -#ifdef PNG_FLOATING_POINT_SUPPORTED - info_ptr->gamma = png_ptr->gamma; -#endif -#ifdef PNG_FIXED_POINT_SUPPORTED - info_ptr->int_gamma = png_ptr->int_gamma; -#endif - } + /* The following used to be conditional on PNG_GAMMA (prior to 1.5.4), + * however it seems that the code in png_init_read_transformations, which has + * been called before this from png_read_update_info->png_read_start_row + * sometimes does the gamma transform and cancels the flag. + * + * TODO: this looks wrong; the info_ptr should end up with a gamma equal to + * the screen_gamma value. The following probably results in weirdness if + * the info_ptr is used by the app after the rows have been read. + */ + info_ptr->colorspace.gamma = png_ptr->colorspace.gamma; #endif -#ifdef PNG_READ_16_TO_8_SUPPORTED - if ((png_ptr->transformations & PNG_16_TO_8) && (info_ptr->bit_depth == 16)) - info_ptr->bit_depth = 8; -#endif + if (info_ptr->bit_depth == 16) + { +# ifdef PNG_READ_16BIT_SUPPORTED +# ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED + if (png_ptr->transformations & PNG_SCALE_16_TO_8) + info_ptr->bit_depth = 8; +# endif + +# ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED + if (png_ptr->transformations & PNG_16_TO_8) + info_ptr->bit_depth = 8; +# endif + +# else + /* No 16 bit support: force chopping 16-bit input down to 8, in this case + * the app program can chose if both APIs are available by setting the + * correct scaling to use. + */ +# ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED + /* For compatibility with previous versions use the strip method by + * default. This code works because if PNG_SCALE_16_TO_8 is already + * set the code below will do that in preference to the chop. + */ + png_ptr->transformations |= PNG_16_TO_8; + info_ptr->bit_depth = 8; +# else + +# ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED + png_ptr->transformations |= PNG_SCALE_16_TO_8; + info_ptr->bit_depth = 8; +# else + + CONFIGURATION ERROR: you must enable at least one 16 to 8 method +# endif +# endif +#endif /* !READ_16BIT_SUPPORTED */ + } #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED if (png_ptr->transformations & PNG_GRAY_TO_RGB) - info_ptr->color_type |= PNG_COLOR_MASK_COLOR; + info_ptr->color_type = (png_byte)(info_ptr->color_type | + PNG_COLOR_MASK_COLOR); #endif #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED if (png_ptr->transformations & PNG_RGB_TO_GRAY) - info_ptr->color_type &= ~PNG_COLOR_MASK_COLOR; + info_ptr->color_type = (png_byte)(info_ptr->color_type & + ~PNG_COLOR_MASK_COLOR); #endif #ifdef PNG_READ_QUANTIZE_SUPPORTED @@ -1251,6 +2042,14 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) } #endif +#ifdef PNG_READ_EXPAND_16_SUPPORTED + if (png_ptr->transformations & PNG_EXPAND_16 && info_ptr->bit_depth == 8 && + info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) + { + info_ptr->bit_depth = 16; + } +#endif + #ifdef PNG_READ_PACK_SUPPORTED if ((png_ptr->transformations & PNG_PACK) && (info_ptr->bit_depth < 8)) info_ptr->bit_depth = 8; @@ -1258,14 +2057,20 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) info_ptr->channels = 1; + else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR) info_ptr->channels = 3; + else info_ptr->channels = 1; #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED - if (png_ptr->flags & PNG_FLAG_STRIP_ALPHA) - info_ptr->color_type &= ~PNG_COLOR_MASK_ALPHA; + if (png_ptr->transformations & PNG_STRIP_ALPHA) + { + info_ptr->color_type = (png_byte)(info_ptr->color_type & + ~PNG_COLOR_MASK_ALPHA); + info_ptr->num_trans = 0; + } #endif if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA) @@ -1280,26 +2085,35 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr) info_ptr->channels++; /* If adding a true alpha channel not just filler */ if (png_ptr->transformations & PNG_ADD_ALPHA) - info_ptr->color_type |= PNG_COLOR_MASK_ALPHA; + info_ptr->color_type |= PNG_COLOR_MASK_ALPHA; } #endif #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) && \ defined(PNG_READ_USER_TRANSFORM_SUPPORTED) if (png_ptr->transformations & PNG_USER_TRANSFORM) - { - if (info_ptr->bit_depth < png_ptr->user_transform_depth) + { + if (info_ptr->bit_depth < png_ptr->user_transform_depth) info_ptr->bit_depth = png_ptr->user_transform_depth; - if (info_ptr->channels < png_ptr->user_transform_channels) + + if (info_ptr->channels < png_ptr->user_transform_channels) info_ptr->channels = png_ptr->user_transform_channels; - } + } #endif info_ptr->pixel_depth = (png_byte)(info_ptr->channels * - info_ptr->bit_depth); + info_ptr->bit_depth); info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, info_ptr->width); + /* Adding in 1.5.4: cache the above value in png_struct so that we can later + * check in png_rowbytes that the user buffer won't get overwritten. Note + * that the field is not always set - if png_read_update_info isn't called + * the application has to either not do any transforms or get the calculation + * right itself. + */ + png_ptr->info_rowbytes = info_ptr->rowbytes; + #ifndef PNG_READ_EXPAND_SUPPORTED if (png_ptr) return; @@ -1311,75 +2125,81 @@ defined(PNG_READ_USER_TRANSFORM_SUPPORTED) * decide how it fits in with the other transformations here. */ void /* PRIVATE */ -png_do_read_transformations(png_structp png_ptr) +png_do_read_transformations(png_structrp png_ptr, png_row_infop row_info) { png_debug(1, "in png_do_read_transformations"); if (png_ptr->row_buf == NULL) { -#ifdef PNG_STDIO_SUPPORTED - char msg[50]; - - png_snprintf2(msg, 50, - "NULL row buffer for row %ld, pass %d", (long)png_ptr->row_number, - png_ptr->pass); - png_error(png_ptr, msg); -#else - png_error(png_ptr, "NULL row buffer"); -#endif - } -#ifdef PNG_WARN_UNINITIALIZED_ROW - if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) - /* Application has failed to call either png_read_start_image() - * or png_read_update_info() after setting transforms that expand - * pixels. This check added to libpng-1.2.19 + /* Prior to 1.5.4 this output row/pass where the NULL pointer is, but this + * error is incredibly rare and incredibly easy to debug without this + * information. + */ + png_error(png_ptr, "NULL row buffer"); + } + + /* The following is debugging; prior to 1.5.4 the code was never compiled in; + * in 1.5.4 PNG_FLAG_DETECT_UNINITIALIZED was added and the macro + * PNG_WARN_UNINITIALIZED_ROW removed. In 1.6 the new flag is set only for + * all transformations, however in practice the ROW_INIT always gets done on + * demand, if necessary. + */ + if ((png_ptr->flags & PNG_FLAG_DETECT_UNINITIALIZED) != 0 && + !(png_ptr->flags & PNG_FLAG_ROW_INIT)) + { + /* Application has failed to call either png_read_start_image() or + * png_read_update_info() after setting transforms that expand pixels. + * This check added to libpng-1.2.19 (but not enabled until 1.5.4). */ -#if (PNG_WARN_UNINITIALIZED_ROW==1) png_error(png_ptr, "Uninitialized row"); -#else - png_warning(png_ptr, "Uninitialized row"); -#endif -#endif + } #ifdef PNG_READ_EXPAND_SUPPORTED if (png_ptr->transformations & PNG_EXPAND) { - if (png_ptr->row_info.color_type == PNG_COLOR_TYPE_PALETTE) + if (row_info->color_type == PNG_COLOR_TYPE_PALETTE) { - png_do_expand_palette(&(png_ptr->row_info), png_ptr->row_buf + 1, - png_ptr->palette, png_ptr->trans_alpha, png_ptr->num_trans); + png_do_expand_palette(row_info, png_ptr->row_buf + 1, + png_ptr->palette, png_ptr->trans_alpha, png_ptr->num_trans); } + else { if (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND_tRNS)) - png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1, - &(png_ptr->trans_color)); + png_do_expand(row_info, png_ptr->row_buf + 1, + &(png_ptr->trans_color)); + else - png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1, - NULL); + png_do_expand(row_info, png_ptr->row_buf + 1, + NULL); } } #endif #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED - if (png_ptr->flags & PNG_FLAG_STRIP_ALPHA) - png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, - PNG_FLAG_FILLER_AFTER | (png_ptr->flags & PNG_FLAG_STRIP_ALPHA)); + if ((png_ptr->transformations & PNG_STRIP_ALPHA) && + !(png_ptr->transformations & PNG_COMPOSE) && + (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA || + row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)) + png_do_strip_channel(row_info, png_ptr->row_buf + 1, + 0 /* at_start == false, because SWAP_ALPHA happens later */); #endif #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED if (png_ptr->transformations & PNG_RGB_TO_GRAY) { int rgb_error = - png_do_rgb_to_gray(png_ptr, &(png_ptr->row_info), - png_ptr->row_buf + 1); + png_do_rgb_to_gray(png_ptr, row_info, + png_ptr->row_buf + 1); + if (rgb_error) { png_ptr->rgb_to_gray_status=1; if ((png_ptr->transformations & PNG_RGB_TO_GRAY) == PNG_RGB_TO_GRAY_WARN) png_warning(png_ptr, "png_do_rgb_to_gray found nongray pixel"); + if ((png_ptr->transformations & PNG_RGB_TO_GRAY) == PNG_RGB_TO_GRAY_ERR) png_error(png_ptr, "png_do_rgb_to_gray found nongray pixel"); @@ -1424,105 +2244,148 @@ png_do_read_transformations(png_structp png_ptr) */ if ((png_ptr->transformations & PNG_GRAY_TO_RGB) && !(png_ptr->mode & PNG_BACKGROUND_IS_GRAY)) - png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_gray_to_rgb(row_info, png_ptr->row_buf + 1); #endif -#ifdef PNG_READ_BACKGROUND_SUPPORTED - if ((png_ptr->transformations & PNG_BACKGROUND) && - ((png_ptr->num_trans != 0 ) || - (png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) - png_do_background(&(png_ptr->row_info), png_ptr->row_buf + 1, - &(png_ptr->trans_color), &(png_ptr->background) -#ifdef PNG_READ_GAMMA_SUPPORTED - , &(png_ptr->background_1), - png_ptr->gamma_table, png_ptr->gamma_from_1, - png_ptr->gamma_to_1, png_ptr->gamma_16_table, - png_ptr->gamma_16_from_1, png_ptr->gamma_16_to_1, - png_ptr->gamma_shift -#endif -); +#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ + defined(PNG_READ_ALPHA_MODE_SUPPORTED) + if (png_ptr->transformations & PNG_COMPOSE) + png_do_compose(row_info, png_ptr->row_buf + 1, png_ptr); #endif #ifdef PNG_READ_GAMMA_SUPPORTED if ((png_ptr->transformations & PNG_GAMMA) && -#ifdef PNG_READ_BACKGROUND_SUPPORTED - !((png_ptr->transformations & PNG_BACKGROUND) && +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED + /* Because RGB_TO_GRAY does the gamma transform. */ + !(png_ptr->transformations & PNG_RGB_TO_GRAY) && +#endif +#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ + defined(PNG_READ_ALPHA_MODE_SUPPORTED) + /* Because PNG_COMPOSE does the gamma transform if there is something to + * do (if there is an alpha channel or transparency.) + */ + !((png_ptr->transformations & PNG_COMPOSE) && ((png_ptr->num_trans != 0) || (png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) && #endif + /* Because png_init_read_transformations transforms the palette, unless + * RGB_TO_GRAY will do the transform. + */ (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)) - png_do_gamma(&(png_ptr->row_info), png_ptr->row_buf + 1, - png_ptr->gamma_table, png_ptr->gamma_16_table, - png_ptr->gamma_shift); + png_do_gamma(row_info, png_ptr->row_buf + 1, png_ptr); #endif -#ifdef PNG_READ_16_TO_8_SUPPORTED +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED + if ((png_ptr->transformations & PNG_STRIP_ALPHA) && + (png_ptr->transformations & PNG_COMPOSE) && + (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA || + row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)) + png_do_strip_channel(row_info, png_ptr->row_buf + 1, + 0 /* at_start == false, because SWAP_ALPHA happens later */); +#endif + +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED + if ((png_ptr->transformations & PNG_ENCODE_ALPHA) && + (row_info->color_type & PNG_COLOR_MASK_ALPHA)) + png_do_encode_alpha(row_info, png_ptr->row_buf + 1, png_ptr); +#endif + +#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED + if (png_ptr->transformations & PNG_SCALE_16_TO_8) + png_do_scale_16_to_8(row_info, png_ptr->row_buf + 1); +#endif + +#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED + /* There is no harm in doing both of these because only one has any effect, + * by putting the 'scale' option first if the app asks for scale (either by + * calling the API or in a TRANSFORM flag) this is what happens. + */ if (png_ptr->transformations & PNG_16_TO_8) - png_do_chop(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_chop(row_info, png_ptr->row_buf + 1); #endif #ifdef PNG_READ_QUANTIZE_SUPPORTED if (png_ptr->transformations & PNG_QUANTIZE) { - png_do_quantize((png_row_infop)&(png_ptr->row_info), png_ptr->row_buf + 1, - png_ptr->palette_lookup, png_ptr->quantize_index); - if (png_ptr->row_info.rowbytes == (png_uint_32)0) + png_do_quantize(row_info, png_ptr->row_buf + 1, + png_ptr->palette_lookup, png_ptr->quantize_index); + + if (row_info->rowbytes == 0) png_error(png_ptr, "png_do_quantize returned rowbytes=0"); } +#endif /* PNG_READ_QUANTIZE_SUPPORTED */ + +#ifdef PNG_READ_EXPAND_16_SUPPORTED + /* Do the expansion now, after all the arithmetic has been done. Notice + * that previous transformations can handle the PNG_EXPAND_16 flag if this + * is efficient (particularly true in the case of gamma correction, where + * better accuracy results faster!) + */ + if (png_ptr->transformations & PNG_EXPAND_16) + png_do_expand_16(row_info, png_ptr->row_buf + 1); +#endif + +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED + /* NOTE: moved here in 1.5.4 (from much later in this list.) */ + if ((png_ptr->transformations & PNG_GRAY_TO_RGB) && + (png_ptr->mode & PNG_BACKGROUND_IS_GRAY)) + png_do_gray_to_rgb(row_info, png_ptr->row_buf + 1); #endif #ifdef PNG_READ_INVERT_SUPPORTED if (png_ptr->transformations & PNG_INVERT_MONO) - png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_invert(row_info, png_ptr->row_buf + 1); #endif #ifdef PNG_READ_SHIFT_SUPPORTED if (png_ptr->transformations & PNG_SHIFT) - png_do_unshift(&(png_ptr->row_info), png_ptr->row_buf + 1, - &(png_ptr->shift)); + png_do_unshift(row_info, png_ptr->row_buf + 1, + &(png_ptr->shift)); #endif #ifdef PNG_READ_PACK_SUPPORTED if (png_ptr->transformations & PNG_PACK) - png_do_unpack(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_unpack(row_info, png_ptr->row_buf + 1); +#endif + +#ifdef PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED + /* Added at libpng-1.5.10 */ + if (row_info->color_type == PNG_COLOR_TYPE_PALETTE && + png_ptr->num_palette_max >= 0) + png_do_check_palette_indexes(png_ptr, row_info); #endif #ifdef PNG_READ_BGR_SUPPORTED if (png_ptr->transformations & PNG_BGR) - png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_bgr(row_info, png_ptr->row_buf + 1); #endif #ifdef PNG_READ_PACKSWAP_SUPPORTED if (png_ptr->transformations & PNG_PACKSWAP) - png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1); -#endif - -#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED - /* If gray -> RGB, do so now only if we did not do so above */ - if ((png_ptr->transformations & PNG_GRAY_TO_RGB) && - (png_ptr->mode & PNG_BACKGROUND_IS_GRAY)) - png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_packswap(row_info, png_ptr->row_buf + 1); #endif #ifdef PNG_READ_FILLER_SUPPORTED if (png_ptr->transformations & PNG_FILLER) - png_do_read_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, - (png_uint_32)png_ptr->filler, png_ptr->flags); + png_do_read_filler(row_info, png_ptr->row_buf + 1, + (png_uint_32)png_ptr->filler, png_ptr->flags); #endif #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED if (png_ptr->transformations & PNG_INVERT_ALPHA) - png_do_read_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_read_invert_alpha(row_info, png_ptr->row_buf + 1); #endif #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED if (png_ptr->transformations & PNG_SWAP_ALPHA) - png_do_read_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_read_swap_alpha(row_info, png_ptr->row_buf + 1); #endif +#ifdef PNG_READ_16BIT_SUPPORTED #ifdef PNG_READ_SWAP_SUPPORTED if (png_ptr->transformations & PNG_SWAP_BYTES) - png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_swap(row_info, png_ptr->row_buf + 1); +#endif #endif #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED @@ -1530,28 +2393,28 @@ png_do_read_transformations(png_structp png_ptr) { if (png_ptr->read_user_transform_fn != NULL) (*(png_ptr->read_user_transform_fn)) /* User read transform function */ - (png_ptr, /* png_ptr */ - &(png_ptr->row_info), /* row_info: */ - /* png_uint_32 width; width of row */ - /* png_uint_32 rowbytes; number of bytes in row */ - /* png_byte color_type; color type of pixels */ - /* png_byte bit_depth; bit depth of samples */ - /* png_byte channels; number of channels (1-4) */ - /* png_byte pixel_depth; bits per pixel (depth*channels) */ - png_ptr->row_buf + 1); /* start of pixel data for row */ + (png_ptr, /* png_ptr */ + row_info, /* row_info: */ + /* png_uint_32 width; width of row */ + /* png_size_t rowbytes; number of bytes in row */ + /* png_byte color_type; color type of pixels */ + /* png_byte bit_depth; bit depth of samples */ + /* png_byte channels; number of channels (1-4) */ + /* png_byte pixel_depth; bits per pixel (depth*channels) */ + png_ptr->row_buf + 1); /* start of pixel data for row */ #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED if (png_ptr->user_transform_depth) - png_ptr->row_info.bit_depth = png_ptr->user_transform_depth; + row_info->bit_depth = png_ptr->user_transform_depth; + if (png_ptr->user_transform_channels) - png_ptr->row_info.channels = png_ptr->user_transform_channels; + row_info->channels = png_ptr->user_transform_channels; #endif - png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth * - png_ptr->row_info.channels); - png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, - png_ptr->row_info.width); + row_info->pixel_depth = (png_byte)(row_info->bit_depth * + row_info->channels); + + row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_info->width); } #endif - } #ifdef PNG_READ_PACK_SUPPORTED @@ -1581,11 +2444,13 @@ png_do_unpack(png_row_infop row_info, png_bytep row) for (i = 0; i < row_width; i++) { *dp = (png_byte)((*sp >> shift) & 0x01); + if (shift == 7) { shift = 0; sp--; } + else shift++; @@ -1603,11 +2468,13 @@ png_do_unpack(png_row_infop row_info, png_bytep row) for (i = 0; i < row_width; i++) { *dp = (png_byte)((*sp >> shift) & 0x03); + if (shift == 6) { shift = 0; sp--; } + else shift += 2; @@ -1624,11 +2491,13 @@ png_do_unpack(png_row_infop row_info, png_bytep row) for (i = 0; i < row_width; i++) { *dp = (png_byte)((*sp >> shift) & 0x0f); + if (shift == 4) { shift = 0; sp--; } + else shift = 4; @@ -1654,161 +2523,222 @@ png_do_unpack(png_row_infop row_info, png_bytep row) * the values back to 0 through 31. */ void /* PRIVATE */ -png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits) +png_do_unshift(png_row_infop row_info, png_bytep row, + png_const_color_8p sig_bits) { + int color_type; + png_debug(1, "in png_do_unshift"); - if ( - row_info->color_type != PNG_COLOR_TYPE_PALETTE) + /* The palette case has already been handled in the _init routine. */ + color_type = row_info->color_type; + + if (color_type != PNG_COLOR_TYPE_PALETTE) { int shift[4]; int channels = 0; - int c; - png_uint_16 value = 0; - png_uint_32 row_width = row_info->width; + int bit_depth = row_info->bit_depth; - if (row_info->color_type & PNG_COLOR_MASK_COLOR) + if (color_type & PNG_COLOR_MASK_COLOR) { - shift[channels++] = row_info->bit_depth - sig_bits->red; - shift[channels++] = row_info->bit_depth - sig_bits->green; - shift[channels++] = row_info->bit_depth - sig_bits->blue; + shift[channels++] = bit_depth - sig_bits->red; + shift[channels++] = bit_depth - sig_bits->green; + shift[channels++] = bit_depth - sig_bits->blue; } + else { - shift[channels++] = row_info->bit_depth - sig_bits->gray; + shift[channels++] = bit_depth - sig_bits->gray; } - if (row_info->color_type & PNG_COLOR_MASK_ALPHA) + + if (color_type & PNG_COLOR_MASK_ALPHA) { - shift[channels++] = row_info->bit_depth - sig_bits->alpha; + shift[channels++] = bit_depth - sig_bits->alpha; } - for (c = 0; c < channels; c++) { - if (shift[c] <= 0) - shift[c] = 0; - else - value = 1; + int c, have_shift; + + for (c = have_shift = 0; c < channels; ++c) + { + /* A shift of more than the bit depth is an error condition but it + * gets ignored here. + */ + if (shift[c] <= 0 || shift[c] >= bit_depth) + shift[c] = 0; + + else + have_shift = 1; + } + + if (!have_shift) + return; } - if (!value) - return; - - switch (row_info->bit_depth) + switch (bit_depth) { default: - break; + /* Must be 1bpp gray: should not be here! */ + /* NOTREACHED */ + break; case 2: + /* Must be 2bpp gray */ + /* assert(channels == 1 && shift[0] == 1) */ { - png_bytep bp; - png_uint_32 i; - png_uint_32 istop = row_info->rowbytes; + png_bytep bp = row; + png_bytep bp_end = bp + row_info->rowbytes; - for (bp = row, i = 0; i < istop; i++) + while (bp < bp_end) { - *bp >>= 1; - *bp++ &= 0x55; + int b = (*bp >> 1) & 0x55; + *bp++ = (png_byte)b; } break; } case 4: + /* Must be 4bpp gray */ + /* assert(channels == 1) */ { png_bytep bp = row; - png_uint_32 i; - png_uint_32 istop = row_info->rowbytes; - png_byte mask = (png_byte)((((int)0xf0 >> shift[0]) & (int)0xf0) | - (png_byte)((int)0xf >> shift[0])); + png_bytep bp_end = bp + row_info->rowbytes; + int gray_shift = shift[0]; + int mask = 0xf >> gray_shift; - for (i = 0; i < istop; i++) + mask |= mask << 4; + + while (bp < bp_end) { - *bp >>= shift[0]; - *bp++ &= mask; + int b = (*bp >> gray_shift) & mask; + *bp++ = (png_byte)b; } break; } case 8: + /* Single byte components, G, GA, RGB, RGBA */ { png_bytep bp = row; - png_uint_32 i; - png_uint_32 istop = row_width * channels; + png_bytep bp_end = bp + row_info->rowbytes; + int channel = 0; - for (i = 0; i < istop; i++) + while (bp < bp_end) { - *bp++ >>= shift[i%channels]; + int b = *bp >> shift[channel]; + if (++channel >= channels) + channel = 0; + *bp++ = (png_byte)b; } break; } +#ifdef PNG_READ_16BIT_SUPPORTED case 16: + /* Double byte components, G, GA, RGB, RGBA */ { png_bytep bp = row; - png_uint_32 i; - png_uint_32 istop = channels * row_width; + png_bytep bp_end = bp + row_info->rowbytes; + int channel = 0; - for (i = 0; i < istop; i++) + while (bp < bp_end) { - value = (png_uint_16)((*bp << 8) + *(bp + 1)); - value >>= shift[i%channels]; + int value = (bp[0] << 8) + bp[1]; + + value >>= shift[channel]; + if (++channel >= channels) + channel = 0; *bp++ = (png_byte)(value >> 8); *bp++ = (png_byte)(value & 0xff); } break; } +#endif } } } #endif -#ifdef PNG_READ_16_TO_8_SUPPORTED -/* Chop rows of bit depth 16 down to 8 */ +#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED +/* Scale rows of bit depth 16 down to 8 accurately */ void /* PRIVATE */ +png_do_scale_16_to_8(png_row_infop row_info, png_bytep row) +{ + png_debug(1, "in png_do_scale_16_to_8"); + + if (row_info->bit_depth == 16) + { + png_bytep sp = row; /* source */ + png_bytep dp = row; /* destination */ + png_bytep ep = sp + row_info->rowbytes; /* end+1 */ + + while (sp < ep) + { + /* The input is an array of 16 bit components, these must be scaled to + * 8 bits each. For a 16 bit value V the required value (from the PNG + * specification) is: + * + * (V * 255) / 65535 + * + * This reduces to round(V / 257), or floor((V + 128.5)/257) + * + * Represent V as the two byte value vhi.vlo. Make a guess that the + * result is the top byte of V, vhi, then the correction to this value + * is: + * + * error = floor(((V-vhi.vhi) + 128.5) / 257) + * = floor(((vlo-vhi) + 128.5) / 257) + * + * This can be approximated using integer arithmetic (and a signed + * shift): + * + * error = (vlo-vhi+128) >> 8; + * + * The approximate differs from the exact answer only when (vlo-vhi) is + * 128; it then gives a correction of +1 when the exact correction is + * 0. This gives 128 errors. The exact answer (correct for all 16 bit + * input values) is: + * + * error = (vlo-vhi+128)*65535 >> 24; + * + * An alternative arithmetic calculation which also gives no errors is: + * + * (V * 255 + 32895) >> 16 + */ + + png_int_32 tmp = *sp++; /* must be signed! */ + tmp += (((int)*sp++ - tmp + 128) * 65535) >> 24; + *dp++ = (png_byte)tmp; + } + + row_info->bit_depth = 8; + row_info->pixel_depth = (png_byte)(8 * row_info->channels); + row_info->rowbytes = row_info->width * row_info->channels; + } +} +#endif + +#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED +void /* PRIVATE */ +/* Simply discard the low byte. This was the default behavior prior + * to libpng-1.5.4. + */ png_do_chop(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_chop"); if (row_info->bit_depth == 16) { - png_bytep sp = row; - png_bytep dp = row; - png_uint_32 i; - png_uint_32 istop = row_info->width * row_info->channels; + png_bytep sp = row; /* source */ + png_bytep dp = row; /* destination */ + png_bytep ep = sp + row_info->rowbytes; /* end+1 */ - for (i = 0; i> 8)) >> 8; - * - * Approximate calculation with shift/add instead of multiply/divide: - * *dp = ((((png_uint_32)(*sp) << 8) | - * (png_uint_32)((int)(*(sp + 1)) - *sp)) + 128) >> 8; - * - * What we actually do to avoid extra shifting and conversion: - */ - - *dp = *sp + ((((int)(*(sp + 1)) - *sp) > 128) ? 1 : 0); -#else - /* Simply discard the low order byte */ - *dp = *sp; -#endif + *dp++ = *sp; + sp += 2; /* skip low byte */ } + row_info->bit_depth = 8; row_info->pixel_depth = (png_byte)(8 * row_info->channels); row_info->rowbytes = row_info->width * row_info->channels; @@ -1843,6 +2773,8 @@ png_do_read_swap_alpha(png_row_infop row_info, png_bytep row) *(--dp) = save; } } + +#ifdef PNG_READ_16BIT_SUPPORTED /* This converts from RRGGBBAA to AARRGGBB */ else { @@ -1865,7 +2797,9 @@ png_do_read_swap_alpha(png_row_infop row_info, png_bytep row) *(--dp) = save[1]; } } +#endif } + else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) { /* This converts from GA to AG */ @@ -1883,6 +2817,8 @@ png_do_read_swap_alpha(png_row_infop row_info, png_bytep row) *(--dp) = save; } } + +#ifdef PNG_READ_16BIT_SUPPORTED /* This converts from GGAA to AAGG */ else { @@ -1901,6 +2837,7 @@ png_do_read_swap_alpha(png_row_infop row_info, png_bytep row) *(--dp) = save[1]; } } +#endif } } } @@ -1910,94 +2847,99 @@ png_do_read_swap_alpha(png_row_infop row_info, png_bytep row) void /* PRIVATE */ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row) { + png_uint_32 row_width; png_debug(1, "in png_do_read_invert_alpha"); + row_width = row_info->width; + if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - png_uint_32 row_width = row_info->width; - if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + if (row_info->bit_depth == 8) { /* This inverts the alpha channel in RGBA */ - if (row_info->bit_depth == 8) + png_bytep sp = row + row_info->rowbytes; + png_bytep dp = sp; + png_uint_32 i; + + for (i = 0; i < row_width; i++) { - png_bytep sp = row + row_info->rowbytes; - png_bytep dp = sp; - png_uint_32 i; + *(--dp) = (png_byte)(255 - *(--sp)); - for (i = 0; i < row_width; i++) - { - *(--dp) = (png_byte)(255 - *(--sp)); - -/* This does nothing: - *(--dp) = *(--sp); - *(--dp) = *(--sp); - *(--dp) = *(--sp); - We can replace it with: +/* This does nothing: + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + We can replace it with: */ - sp-=3; - dp=sp; - } - } - /* This inverts the alpha channel in RRGGBBAA */ - else - { - png_bytep sp = row + row_info->rowbytes; - png_bytep dp = sp; - png_uint_32 i; - - for (i = 0; i < row_width; i++) - { - *(--dp) = (png_byte)(255 - *(--sp)); - *(--dp) = (png_byte)(255 - *(--sp)); - -/* This does nothing: - *(--dp) = *(--sp); - *(--dp) = *(--sp); - *(--dp) = *(--sp); - *(--dp) = *(--sp); - *(--dp) = *(--sp); - *(--dp) = *(--sp); - We can replace it with: -*/ - sp-=6; - dp=sp; - } + sp-=3; + dp=sp; } } - else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) + +#ifdef PNG_READ_16BIT_SUPPORTED + /* This inverts the alpha channel in RRGGBBAA */ + else + { + png_bytep sp = row + row_info->rowbytes; + png_bytep dp = sp; + png_uint_32 i; + + for (i = 0; i < row_width; i++) + { + *(--dp) = (png_byte)(255 - *(--sp)); + *(--dp) = (png_byte)(255 - *(--sp)); + +/* This does nothing: + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + We can replace it with: +*/ + sp-=6; + dp=sp; + } + } +#endif + } + else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) + { + if (row_info->bit_depth == 8) { /* This inverts the alpha channel in GA */ - if (row_info->bit_depth == 8) - { - png_bytep sp = row + row_info->rowbytes; - png_bytep dp = sp; - png_uint_32 i; + png_bytep sp = row + row_info->rowbytes; + png_bytep dp = sp; + png_uint_32 i; - for (i = 0; i < row_width; i++) - { - *(--dp) = (png_byte)(255 - *(--sp)); - *(--dp) = *(--sp); - } - } - /* This inverts the alpha channel in GGAA */ - else + for (i = 0; i < row_width; i++) { - png_bytep sp = row + row_info->rowbytes; - png_bytep dp = sp; - png_uint_32 i; - - for (i = 0; i < row_width; i++) - { - *(--dp) = (png_byte)(255 - *(--sp)); - *(--dp) = (png_byte)(255 - *(--sp)); -/* - *(--dp) = *(--sp); - *(--dp) = *(--sp); -*/ - sp-=2; - dp=sp; - } + *(--dp) = (png_byte)(255 - *(--sp)); + *(--dp) = *(--sp); } } + +#ifdef PNG_READ_16BIT_SUPPORTED + else + { + /* This inverts the alpha channel in GGAA */ + png_bytep sp = row + row_info->rowbytes; + png_bytep dp = sp; + png_uint_32 i; + + for (i = 0; i < row_width; i++) + { + *(--dp) = (png_byte)(255 - *(--sp)); + *(--dp) = (png_byte)(255 - *(--sp)); +/* + *(--dp) = *(--sp); + *(--dp) = *(--sp); +*/ + sp-=2; + dp=sp; + } + } +#endif } } #endif @@ -2006,12 +2948,14 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row) /* Add filler channel if we have RGB color */ void /* PRIVATE */ png_do_read_filler(png_row_infop row_info, png_bytep row, - png_uint_32 filler, png_uint_32 flags) + png_uint_32 filler, png_uint_32 flags) { png_uint_32 i; png_uint_32 row_width = row_info->width; +#ifdef PNG_READ_16BIT_SUPPORTED png_byte hi_filler = (png_byte)((filler>>8) & 0xff); +#endif png_byte lo_filler = (png_byte)(filler & 0xff); png_debug(1, "in png_do_read_filler"); @@ -2021,9 +2965,9 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, { if (row_info->bit_depth == 8) { - /* This changes the data from G to GX */ if (flags & PNG_FLAG_FILLER_AFTER) { + /* This changes the data from G to GX */ png_bytep sp = row + (png_size_t)row_width; png_bytep dp = sp + (png_size_t)row_width; for (i = 1; i < row_width; i++) @@ -2036,9 +2980,10 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, row_info->pixel_depth = 16; row_info->rowbytes = row_width * 2; } - /* This changes the data from G to XG */ + else { + /* This changes the data from G to XG */ png_bytep sp = row + (png_size_t)row_width; png_bytep dp = sp + (png_size_t)row_width; for (i = 0; i < row_width; i++) @@ -2051,11 +2996,13 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, row_info->rowbytes = row_width * 2; } } + +#ifdef PNG_READ_16BIT_SUPPORTED else if (row_info->bit_depth == 16) { - /* This changes the data from GG to GGXX */ if (flags & PNG_FLAG_FILLER_AFTER) { + /* This changes the data from GG to GGXX */ png_bytep sp = row + (png_size_t)row_width * 2; png_bytep dp = sp + (png_size_t)row_width * 2; for (i = 1; i < row_width; i++) @@ -2071,9 +3018,10 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, row_info->pixel_depth = 32; row_info->rowbytes = row_width * 4; } - /* This changes the data from GG to XXGG */ + else { + /* This changes the data from GG to XXGG */ png_bytep sp = row + (png_size_t)row_width * 2; png_bytep dp = sp + (png_size_t)row_width * 2; for (i = 0; i < row_width; i++) @@ -2088,14 +3036,15 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, row_info->rowbytes = row_width * 4; } } +#endif } /* COLOR_TYPE == GRAY */ else if (row_info->color_type == PNG_COLOR_TYPE_RGB) { if (row_info->bit_depth == 8) { - /* This changes the data from RGB to RGBX */ if (flags & PNG_FLAG_FILLER_AFTER) { + /* This changes the data from RGB to RGBX */ png_bytep sp = row + (png_size_t)row_width * 3; png_bytep dp = sp + (png_size_t)row_width; for (i = 1; i < row_width; i++) @@ -2110,9 +3059,10 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, row_info->pixel_depth = 32; row_info->rowbytes = row_width * 4; } - /* This changes the data from RGB to XRGB */ + else { + /* This changes the data from RGB to XRGB */ png_bytep sp = row + (png_size_t)row_width * 3; png_bytep dp = sp + (png_size_t)row_width; for (i = 0; i < row_width; i++) @@ -2127,11 +3077,13 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, row_info->rowbytes = row_width * 4; } } + +#ifdef PNG_READ_16BIT_SUPPORTED else if (row_info->bit_depth == 16) { - /* This changes the data from RRGGBB to RRGGBBXX */ if (flags & PNG_FLAG_FILLER_AFTER) { + /* This changes the data from RRGGBB to RRGGBBXX */ png_bytep sp = row + (png_size_t)row_width * 6; png_bytep dp = sp + (png_size_t)row_width * 2; for (i = 1; i < row_width; i++) @@ -2151,9 +3103,10 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, row_info->pixel_depth = 64; row_info->rowbytes = row_width * 8; } - /* This changes the data from RRGGBB to XXRRGGBB */ + else { + /* This changes the data from RRGGBB to XXRRGGBB */ png_bytep sp = row + (png_size_t)row_width * 6; png_bytep dp = sp + (png_size_t)row_width * 2; for (i = 0; i < row_width; i++) @@ -2167,11 +3120,13 @@ png_do_read_filler(png_row_infop row_info, png_bytep row, *(--dp) = hi_filler; *(--dp) = lo_filler; } + row_info->channels = 4; row_info->pixel_depth = 64; row_info->rowbytes = row_width * 8; } } +#endif } /* COLOR_TYPE == RGB */ } #endif @@ -2187,12 +3142,13 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) png_debug(1, "in png_do_gray_to_rgb"); if (row_info->bit_depth >= 8 && - !(row_info->color_type & PNG_COLOR_MASK_COLOR)) + !(row_info->color_type & PNG_COLOR_MASK_COLOR)) { if (row_info->color_type == PNG_COLOR_TYPE_GRAY) { if (row_info->bit_depth == 8) { + /* This changes G to RGB */ png_bytep sp = row + (png_size_t)row_width - 1; png_bytep dp = sp + (png_size_t)row_width * 2; for (i = 0; i < row_width; i++) @@ -2202,8 +3158,10 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) *(dp--) = *(sp--); } } + else { + /* This changes GG to RRGGBB */ png_bytep sp = row + (png_size_t)row_width * 2 - 1; png_bytep dp = sp + (png_size_t)row_width * 4; for (i = 0; i < row_width; i++) @@ -2217,10 +3175,12 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) } } } + else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) { if (row_info->bit_depth == 8) { + /* This changes GA to RGBA */ png_bytep sp = row + (png_size_t)row_width * 2 - 1; png_bytep dp = sp + (png_size_t)row_width * 2; for (i = 0; i < row_width; i++) @@ -2231,8 +3191,10 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) *(dp--) = *(sp--); } } + else { + /* This changes GGAA to RRGGBBAA */ png_bytep sp = row + (png_size_t)row_width * 4 - 1; png_bytep dp = sp + (png_size_t)row_width * 4; for (i = 0; i < row_width; i++) @@ -2248,10 +3210,10 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) } } } - row_info->channels += (png_byte)2; + row_info->channels = (png_byte)(row_info->channels + 2); row_info->color_type |= PNG_COLOR_MASK_COLOR; row_info->pixel_depth = (png_byte)(row_info->channels * - row_info->bit_depth); + row_info->bit_depth); row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width); } } @@ -2259,264 +3221,258 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED /* Reduce RGB files to grayscale, with or without alpha - * using the equation given in Poynton's ColorFAQ at - * (THIS LINK IS DEAD June 2008) - * New link: - * + * using the equation given in Poynton's ColorFAQ of 1998-01-04 at + * (THIS LINK IS DEAD June 2008 but + * versions dated 1998 through November 2002 have been archived at + * http://web.archive.org/web/20000816232553/http://www.inforamp.net/ + * ~poynton/notes/colour_and_gamma/ColorFAQ.txt ) * Charles Poynton poynton at poynton.com * * Y = 0.212671 * R + 0.715160 * G + 0.072169 * B * - * We approximate this with - * - * Y = 0.21268 * R + 0.7151 * G + 0.07217 * B - * * which can be expressed with integers as * * Y = (6969 * R + 23434 * G + 2365 * B)/32768 * - * The calculation is to be done in a linear colorspace. + * Poynton's current link (as of January 2003 through July 2011): + * + * has changed the numbers slightly: * - * Other integer coefficents can be used via png_set_rgb_to_gray(). + * Y = 0.2126*R + 0.7152*G + 0.0722*B + * + * which can be expressed with integers as + * + * Y = (6966 * R + 23436 * G + 2366 * B)/32768 + * + * Historically, however, libpng uses numbers derived from the ITU-R Rec 709 + * end point chromaticities and the D65 white point. Depending on the + * precision used for the D65 white point this produces a variety of different + * numbers, however if the four decimal place value used in ITU-R Rec 709 is + * used (0.3127,0.3290) the Y calculation would be: + * + * Y = (6968 * R + 23435 * G + 2366 * B)/32768 + * + * While this is correct the rounding results in an overflow for white, because + * the sum of the rounded coefficients is 32769, not 32768. Consequently + * libpng uses, instead, the closest non-overflowing approximation: + * + * Y = (6968 * R + 23434 * G + 2366 * B)/32768 + * + * Starting with libpng-1.5.5, if the image being converted has a cHRM chunk + * (including an sRGB chunk) then the chromaticities are used to calculate the + * coefficients. See the chunk handling in pngrutil.c for more information. + * + * In all cases the calculation is to be done in a linear colorspace. If no + * gamma information is available to correct the encoding of the original RGB + * values this results in an implicit assumption that the original PNG RGB + * values were linear. + * + * Other integer coefficents can be used via png_set_rgb_to_gray(). Because + * the API takes just red and green coefficients the blue coefficient is + * calculated to make the sum 32768. This will result in different rounding + * to that used above. */ int /* PRIVATE */ -png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) +png_do_rgb_to_gray(png_structrp png_ptr, png_row_infop row_info, png_bytep row) { - png_uint_32 i; - - png_uint_32 row_width = row_info->width; int rgb_error = 0; png_debug(1, "in png_do_rgb_to_gray"); if (!(row_info->color_type & PNG_COLOR_MASK_PALETTE) && - (row_info->color_type & PNG_COLOR_MASK_COLOR)) + (row_info->color_type & PNG_COLOR_MASK_COLOR)) { - png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff; - png_uint_32 gc = png_ptr->rgb_to_gray_green_coeff; - png_uint_32 bc = png_ptr->rgb_to_gray_blue_coeff; + PNG_CONST png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff; + PNG_CONST png_uint_32 gc = png_ptr->rgb_to_gray_green_coeff; + PNG_CONST png_uint_32 bc = 32768 - rc - gc; + PNG_CONST png_uint_32 row_width = row_info->width; + PNG_CONST int have_alpha = + (row_info->color_type & PNG_COLOR_MASK_ALPHA) != 0; - if (row_info->color_type == PNG_COLOR_TYPE_RGB) + if (row_info->bit_depth == 8) { - if (row_info->bit_depth == 8) +#ifdef PNG_READ_GAMMA_SUPPORTED + /* Notice that gamma to/from 1 are not necessarily inverses (if + * there is an overall gamma correction). Prior to 1.5.5 this code + * checked the linearized values for equality; this doesn't match + * the documentation, the original values must be checked. + */ + if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL) { -#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) - if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL) - { - png_bytep sp = row; - png_bytep dp = row; + png_bytep sp = row; + png_bytep dp = row; + png_uint_32 i; - for (i = 0; i < row_width; i++) - { - png_byte red = png_ptr->gamma_to_1[*(sp++)]; - png_byte green = png_ptr->gamma_to_1[*(sp++)]; - png_byte blue = png_ptr->gamma_to_1[*(sp++)]; - if (red != green || red != blue) - { - rgb_error |= 1; - *(dp++) = png_ptr->gamma_from_1[ - (rc*red + gc*green + bc*blue)>>15]; - } - else - *(dp++) = *(sp - 1); - } - } - else -#endif + for (i = 0; i < row_width; i++) { - png_bytep sp = row; - png_bytep dp = row; - for (i = 0; i < row_width; i++) + png_byte red = *(sp++); + png_byte green = *(sp++); + png_byte blue = *(sp++); + + if (red != green || red != blue) { - png_byte red = *(sp++); - png_byte green = *(sp++); - png_byte blue = *(sp++); - if (red != green || red != blue) - { - rgb_error |= 1; - *(dp++) = (png_byte)((rc*red + gc*green + bc*blue)>>15); - } - else - *(dp++) = *(sp - 1); + red = png_ptr->gamma_to_1[red]; + green = png_ptr->gamma_to_1[green]; + blue = png_ptr->gamma_to_1[blue]; + + rgb_error |= 1; + *(dp++) = png_ptr->gamma_from_1[ + (rc*red + gc*green + bc*blue + 16384)>>15]; } + + else + { + /* If there is no overall correction the table will not be + * set. + */ + if (png_ptr->gamma_table != NULL) + red = png_ptr->gamma_table[red]; + + *(dp++) = red; + } + + if (have_alpha) + *(dp++) = *(sp++); } } - - else /* RGB bit_depth == 16 */ - { -#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) - if (png_ptr->gamma_16_to_1 != NULL && - png_ptr->gamma_16_from_1 != NULL) - { - png_bytep sp = row; - png_bytep dp = row; - for (i = 0; i < row_width; i++) - { - png_uint_16 red, green, blue, w; - - red = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; - green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; - blue = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; - - if (red == green && red == blue) - w = red; - else - { - png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red&0xff) >> - png_ptr->gamma_shift][red>>8]; - png_uint_16 green_1 = - png_ptr->gamma_16_to_1[(green&0xff) >> - png_ptr->gamma_shift][green>>8]; - png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >> - png_ptr->gamma_shift][blue>>8]; - png_uint_16 gray16 = (png_uint_16)((rc*red_1 + gc*green_1 - + bc*blue_1)>>15); - w = png_ptr->gamma_16_from_1[(gray16&0xff) >> - png_ptr->gamma_shift][gray16 >> 8]; - rgb_error |= 1; - } - - *(dp++) = (png_byte)((w>>8) & 0xff); - *(dp++) = (png_byte)(w & 0xff); - } - } - else + else #endif + { + png_bytep sp = row; + png_bytep dp = row; + png_uint_32 i; + + for (i = 0; i < row_width; i++) { - png_bytep sp = row; - png_bytep dp = row; - for (i = 0; i < row_width; i++) + png_byte red = *(sp++); + png_byte green = *(sp++); + png_byte blue = *(sp++); + + if (red != green || red != blue) { - png_uint_16 red, green, blue, gray16; - - red = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; - green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; - blue = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; - - if (red != green || red != blue) - rgb_error |= 1; - gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>15); - *(dp++) = (png_byte)((gray16>>8) & 0xff); - *(dp++) = (png_byte)(gray16 & 0xff); + rgb_error |= 1; + /* NOTE: this is the historical approach which simply + * truncates the results. + */ + *(dp++) = (png_byte)((rc*red + gc*green + bc*blue)>>15); } + + else + *(dp++) = red; + + if (have_alpha) + *(dp++) = *(sp++); } } } - if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + + else /* RGB bit_depth == 16 */ { - if (row_info->bit_depth == 8) +#ifdef PNG_READ_GAMMA_SUPPORTED + if (png_ptr->gamma_16_to_1 != NULL && png_ptr->gamma_16_from_1 != NULL) { -#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) - if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL) - { - png_bytep sp = row; - png_bytep dp = row; - for (i = 0; i < row_width; i++) - { - png_byte red = png_ptr->gamma_to_1[*(sp++)]; - png_byte green = png_ptr->gamma_to_1[*(sp++)]; - png_byte blue = png_ptr->gamma_to_1[*(sp++)]; - if (red != green || red != blue) - rgb_error |= 1; - *(dp++) = png_ptr->gamma_from_1 - [(rc*red + gc*green + bc*blue)>>15]; - *(dp++) = *(sp++); /* alpha */ - } - } - else -#endif - { - png_bytep sp = row; - png_bytep dp = row; - for (i = 0; i < row_width; i++) - { - png_byte red = *(sp++); - png_byte green = *(sp++); - png_byte blue = *(sp++); - if (red != green || red != blue) - rgb_error |= 1; - *(dp++) = (png_byte)((rc*red + gc*green + bc*blue)>>15); - *(dp++) = *(sp++); /* alpha */ - } - } - } - else /* RGBA bit_depth == 16 */ - { -#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) - if (png_ptr->gamma_16_to_1 != NULL && - png_ptr->gamma_16_from_1 != NULL) - { - png_bytep sp = row; - png_bytep dp = row; - for (i = 0; i < row_width; i++) - { - png_uint_16 red, green, blue, w; + png_bytep sp = row; + png_bytep dp = row; + png_uint_32 i; - red = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; - green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; - blue = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2; + for (i = 0; i < row_width; i++) + { + png_uint_16 red, green, blue, w; + + red = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + green = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + blue = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + + if (red == green && red == blue) + { + if (png_ptr->gamma_16_table != NULL) + w = png_ptr->gamma_16_table[(red&0xff) + >> png_ptr->gamma_shift][red>>8]; - if (red == green && red == blue) - w = red; else - { - png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red&0xff) >> - png_ptr->gamma_shift][red>>8]; - png_uint_16 green_1 = - png_ptr->gamma_16_to_1[(green&0xff) >> - png_ptr->gamma_shift][green>>8]; - png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >> - png_ptr->gamma_shift][blue>>8]; - png_uint_16 gray16 = (png_uint_16)((rc * red_1 - + gc * green_1 + bc * blue_1)>>15); - w = png_ptr->gamma_16_from_1[(gray16&0xff) >> - png_ptr->gamma_shift][gray16 >> 8]; - rgb_error |= 1; - } + w = red; + } - *(dp++) = (png_byte)((w>>8) & 0xff); - *(dp++) = (png_byte)(w & 0xff); - *(dp++) = *(sp++); /* alpha */ + else + { + png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red&0xff) + >> png_ptr->gamma_shift][red>>8]; + png_uint_16 green_1 = + png_ptr->gamma_16_to_1[(green&0xff) >> + png_ptr->gamma_shift][green>>8]; + png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) + >> png_ptr->gamma_shift][blue>>8]; + png_uint_16 gray16 = (png_uint_16)((rc*red_1 + gc*green_1 + + bc*blue_1 + 16384)>>15); + w = png_ptr->gamma_16_from_1[(gray16&0xff) >> + png_ptr->gamma_shift][gray16 >> 8]; + rgb_error |= 1; + } + + *(dp++) = (png_byte)((w>>8) & 0xff); + *(dp++) = (png_byte)(w & 0xff); + + if (have_alpha) + { + *(dp++) = *(sp++); *(dp++) = *(sp++); } } - else + } + else #endif + { + png_bytep sp = row; + png_bytep dp = row; + png_uint_32 i; + + for (i = 0; i < row_width; i++) { - png_bytep sp = row; - png_bytep dp = row; - for (i = 0; i < row_width; i++) + png_uint_16 red, green, blue, gray16; + + red = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + green = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + blue = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + + if (red != green || red != blue) + rgb_error |= 1; + + /* From 1.5.5 in the 16 bit case do the accurate conversion even + * in the 'fast' case - this is because this is where the code + * ends up when handling linear 16 bit data. + */ + gray16 = (png_uint_16)((rc*red + gc*green + bc*blue + 16384) >> + 15); + *(dp++) = (png_byte)((gray16>>8) & 0xff); + *(dp++) = (png_byte)(gray16 & 0xff); + + if (have_alpha) { - png_uint_16 red, green, blue, gray16; - red = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2; - green = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2; - blue = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2; - if (red != green || red != blue) - rgb_error |= 1; - gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>15); - *(dp++) = (png_byte)((gray16>>8) & 0xff); - *(dp++) = (png_byte)(gray16 & 0xff); - *(dp++) = *(sp++); /* alpha */ + *(dp++) = *(sp++); *(dp++) = *(sp++); } } } } - row_info->channels -= (png_byte)2; - row_info->color_type &= ~PNG_COLOR_MASK_COLOR; + + row_info->channels = (png_byte)(row_info->channels - 2); + row_info->color_type = (png_byte)(row_info->color_type & + ~PNG_COLOR_MASK_COLOR); row_info->pixel_depth = (png_byte)(row_info->channels * - row_info->bit_depth); + row_info->bit_depth); row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width); } return rgb_error; } #endif +#endif /* PNG_READ_TRANSFORMS_SUPPORTED */ +#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED /* Build a grayscale palette. Palette is assumed to be 1 << bit_depth * large of png_color. This lets grayscale images be treated as * paletted. Most useful for gamma correction and simplification - * of code. + * of code. This API is not used internally. */ void PNGAPI png_build_grayscale_palette(int bit_depth, png_colorp palette) @@ -2566,34 +3522,37 @@ png_build_grayscale_palette(int bit_depth, png_colorp palette) palette[i].blue = (png_byte)v; } } +#endif -#ifdef PNG_READ_BACKGROUND_SUPPORTED +#ifdef PNG_READ_TRANSFORMS_SUPPORTED +#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ + defined(PNG_READ_ALPHA_MODE_SUPPORTED) /* Replace any alpha or transparency with the supplied background color. * "background" is already in the screen gamma, while "background_1" is * at a gamma of 1.0. Paletted files have already been taken care of. */ void /* PRIVATE */ -png_do_background(png_row_infop row_info, png_bytep row, - png_color_16p trans_color, png_color_16p background -#ifdef PNG_READ_GAMMA_SUPPORTED - , png_color_16p background_1, - png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, - png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, - png_uint_16pp gamma_16_to_1, int gamma_shift -#endif - ) +png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr) { - png_bytep sp, dp; +#ifdef PNG_READ_GAMMA_SUPPORTED + png_const_bytep gamma_table = png_ptr->gamma_table; + png_const_bytep gamma_from_1 = png_ptr->gamma_from_1; + png_const_bytep gamma_to_1 = png_ptr->gamma_to_1; + png_const_uint_16pp gamma_16 = png_ptr->gamma_16_table; + png_const_uint_16pp gamma_16_from_1 = png_ptr->gamma_16_from_1; + png_const_uint_16pp gamma_16_to_1 = png_ptr->gamma_16_to_1; + int gamma_shift = png_ptr->gamma_shift; + int optimize = (png_ptr->flags & PNG_FLAG_OPTIMIZE_ALPHA) != 0; +#endif + + png_bytep sp; png_uint_32 i; - png_uint_32 row_width=row_info->width; + png_uint_32 row_width = row_info->width; int shift; - png_debug(1, "in png_do_background"); + png_debug(1, "in png_do_compose"); - if (background != NULL && - (!(row_info->color_type & PNG_COLOR_MASK_ALPHA) || - (row_info->color_type != PNG_COLOR_TYPE_PALETTE && trans_color))) { switch (row_info->color_type) { @@ -2608,16 +3567,19 @@ png_do_background(png_row_infop row_info, png_bytep row, for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x01) - == trans_color->gray) + == png_ptr->trans_color.gray) { - *sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff); - *sp |= (png_byte)(background->gray << shift); + unsigned int tmp = *sp & (0x7f7f >> (7 - shift)); + tmp |= png_ptr->background.gray << shift; + *sp = (png_byte)(tmp & 0xff); } + if (!shift) { shift = 7; sp++; } + else shift--; } @@ -2634,28 +3596,34 @@ png_do_background(png_row_infop row_info, png_bytep row, for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x03) - == trans_color->gray) + == png_ptr->trans_color.gray) { - *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); - *sp |= (png_byte)(background->gray << shift); + unsigned int tmp = *sp & (0x3f3f >> (6 - shift)); + tmp |= png_ptr->background.gray << shift; + *sp = (png_byte)(tmp & 0xff); } + else { - png_byte p = (png_byte)((*sp >> shift) & 0x03); - png_byte g = (png_byte)((gamma_table [p | (p << 2) | - (p << 4) | (p << 6)] >> 6) & 0x03); - *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); - *sp |= (png_byte)(g << shift); + unsigned int p = (*sp >> shift) & 0x03; + unsigned int g = (gamma_table [p | (p << 2) | + (p << 4) | (p << 6)] >> 6) & 0x03; + unsigned int tmp = *sp & (0x3f3f >> (6 - shift)); + tmp |= g << shift; + *sp = (png_byte)(tmp & 0xff); } + if (!shift) { shift = 6; sp++; } + else shift -= 2; } } + else #endif { @@ -2664,16 +3632,19 @@ png_do_background(png_row_infop row_info, png_bytep row, for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x03) - == trans_color->gray) + == png_ptr->trans_color.gray) { - *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); - *sp |= (png_byte)(background->gray << shift); + unsigned int tmp = *sp & (0x3f3f >> (6 - shift)); + tmp |= png_ptr->background.gray << shift; + *sp = (png_byte)(tmp & 0xff); } + if (!shift) { shift = 6; sp++; } + else shift -= 2; } @@ -2691,28 +3662,34 @@ png_do_background(png_row_infop row_info, png_bytep row, for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x0f) - == trans_color->gray) + == png_ptr->trans_color.gray) { - *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); - *sp |= (png_byte)(background->gray << shift); + unsigned int tmp = *sp & (0xf0f >> (4 - shift)); + tmp |= png_ptr->background.gray << shift; + *sp = (png_byte)(tmp & 0xff); } + else { - png_byte p = (png_byte)((*sp >> shift) & 0x0f); - png_byte g = (png_byte)((gamma_table[p | - (p << 4)] >> 4) & 0x0f); - *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); - *sp |= (png_byte)(g << shift); + unsigned int p = (*sp >> shift) & 0x0f; + unsigned int g = (gamma_table[p | (p << 4)] >> 4) & + 0x0f; + unsigned int tmp = *sp & (0xf0f >> (4 - shift)); + tmp |= g << shift; + *sp = (png_byte)(tmp & 0xff); } + if (!shift) { shift = 4; sp++; } + else shift -= 4; } } + else #endif { @@ -2721,16 +3698,19 @@ png_do_background(png_row_infop row_info, png_bytep row, for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x0f) - == trans_color->gray) + == png_ptr->trans_color.gray) { - *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); - *sp |= (png_byte)(background->gray << shift); + unsigned int tmp = *sp & (0xf0f >> (4 - shift)); + tmp |= png_ptr->background.gray << shift; + *sp = (png_byte)(tmp & 0xff); } + if (!shift) { shift = 4; sp++; } + else shift -= 4; } @@ -2746,14 +3726,11 @@ png_do_background(png_row_infop row_info, png_bytep row, sp = row; for (i = 0; i < row_width; i++, sp++) { - if (*sp == trans_color->gray) - { - *sp = (png_byte)background->gray; - } + if (*sp == png_ptr->trans_color.gray) + *sp = (png_byte)png_ptr->background.gray; + else - { *sp = gamma_table[*sp]; - } } } else @@ -2762,10 +3739,8 @@ png_do_background(png_row_infop row_info, png_bytep row, sp = row; for (i = 0; i < row_width; i++, sp++) { - if (*sp == trans_color->gray) - { - *sp = (png_byte)background->gray; - } + if (*sp == png_ptr->trans_color.gray) + *sp = (png_byte)png_ptr->background.gray; } } break; @@ -2782,12 +3757,16 @@ png_do_background(png_row_infop row_info, png_bytep row, png_uint_16 v; v = (png_uint_16)(((*sp) << 8) + *(sp + 1)); - if (v == trans_color->gray) + + if (v == png_ptr->trans_color.gray) { /* Background is already in screen gamma */ - *sp = (png_byte)((background->gray >> 8) & 0xff); - *(sp + 1) = (png_byte)(background->gray & 0xff); + *sp = (png_byte)((png_ptr->background.gray >> 8) + & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.gray + & 0xff); } + else { v = gamma_16[*(sp + 1) >> gamma_shift][*sp]; @@ -2805,10 +3784,13 @@ png_do_background(png_row_infop row_info, png_bytep row, png_uint_16 v; v = (png_uint_16)(((*sp) << 8) + *(sp + 1)); - if (v == trans_color->gray) + + if (v == png_ptr->trans_color.gray) { - *sp = (png_byte)((background->gray >> 8) & 0xff); - *(sp + 1) = (png_byte)(background->gray & 0xff); + *sp = (png_byte)((png_ptr->background.gray >> 8) + & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.gray + & 0xff); } } } @@ -2831,14 +3813,15 @@ png_do_background(png_row_infop row_info, png_bytep row, sp = row; for (i = 0; i < row_width; i++, sp += 3) { - if (*sp == trans_color->red && - *(sp + 1) == trans_color->green && - *(sp + 2) == trans_color->blue) + if (*sp == png_ptr->trans_color.red && + *(sp + 1) == png_ptr->trans_color.green && + *(sp + 2) == png_ptr->trans_color.blue) { - *sp = (png_byte)background->red; - *(sp + 1) = (png_byte)background->green; - *(sp + 2) = (png_byte)background->blue; + *sp = (png_byte)png_ptr->background.red; + *(sp + 1) = (png_byte)png_ptr->background.green; + *(sp + 2) = (png_byte)png_ptr->background.blue; } + else { *sp = gamma_table[*sp]; @@ -2853,13 +3836,13 @@ png_do_background(png_row_infop row_info, png_bytep row, sp = row; for (i = 0; i < row_width; i++, sp += 3) { - if (*sp == trans_color->red && - *(sp + 1) == trans_color->green && - *(sp + 2) == trans_color->blue) + if (*sp == png_ptr->trans_color.red && + *(sp + 1) == png_ptr->trans_color.green && + *(sp + 2) == png_ptr->trans_color.blue) { - *sp = (png_byte)background->red; - *(sp + 1) = (png_byte)background->green; - *(sp + 2) = (png_byte)background->blue; + *sp = (png_byte)png_ptr->background.red; + *(sp + 1) = (png_byte)png_ptr->background.green; + *(sp + 2) = (png_byte)png_ptr->background.blue; } } } @@ -2873,52 +3856,73 @@ png_do_background(png_row_infop row_info, png_bytep row, for (i = 0; i < row_width; i++, sp += 6) { png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1)); - png_uint_16 g = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3)); - png_uint_16 b = (png_uint_16)(((*(sp+4)) << 8) + *(sp+5)); - if (r == trans_color->red && g == trans_color->green && - b == trans_color->blue) + + png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8) + + *(sp + 3)); + + png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8) + + *(sp + 5)); + + if (r == png_ptr->trans_color.red && + g == png_ptr->trans_color.green && + b == png_ptr->trans_color.blue) { /* Background is already in screen gamma */ - *sp = (png_byte)((background->red >> 8) & 0xff); - *(sp + 1) = (png_byte)(background->red & 0xff); - *(sp + 2) = (png_byte)((background->green >> 8) & 0xff); - *(sp + 3) = (png_byte)(background->green & 0xff); - *(sp + 4) = (png_byte)((background->blue >> 8) & 0xff); - *(sp + 5) = (png_byte)(background->blue & 0xff); + *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff); + *(sp + 2) = (png_byte)((png_ptr->background.green >> 8) + & 0xff); + *(sp + 3) = (png_byte)(png_ptr->background.green + & 0xff); + *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8) + & 0xff); + *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff); } + else { png_uint_16 v = gamma_16[*(sp + 1) >> gamma_shift][*sp]; *sp = (png_byte)((v >> 8) & 0xff); *(sp + 1) = (png_byte)(v & 0xff); + v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)]; *(sp + 2) = (png_byte)((v >> 8) & 0xff); *(sp + 3) = (png_byte)(v & 0xff); + v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)]; *(sp + 4) = (png_byte)((v >> 8) & 0xff); *(sp + 5) = (png_byte)(v & 0xff); } } } + else #endif { sp = row; for (i = 0; i < row_width; i++, sp += 6) { - png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp+1)); - png_uint_16 g = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3)); - png_uint_16 b = (png_uint_16)(((*(sp+4)) << 8) + *(sp+5)); + png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1)); - if (r == trans_color->red && g == trans_color->green && - b == trans_color->blue) + png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8) + + *(sp + 3)); + + png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8) + + *(sp + 5)); + + if (r == png_ptr->trans_color.red && + g == png_ptr->trans_color.green && + b == png_ptr->trans_color.blue) { - *sp = (png_byte)((background->red >> 8) & 0xff); - *(sp + 1) = (png_byte)(background->red & 0xff); - *(sp + 2) = (png_byte)((background->green >> 8) & 0xff); - *(sp + 3) = (png_byte)(background->green & 0xff); - *(sp + 4) = (png_byte)((background->blue >> 8) & 0xff); - *(sp + 5) = (png_byte)(background->blue & 0xff); + *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff); + *(sp + 2) = (png_byte)((png_ptr->background.green >> 8) + & 0xff); + *(sp + 3) = (png_byte)(png_ptr->background.green + & 0xff); + *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8) + & 0xff); + *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff); } } } @@ -2935,27 +3939,28 @@ png_do_background(png_row_infop row_info, png_bytep row, gamma_table != NULL) { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 2, dp++) + for (i = 0; i < row_width; i++, sp += 2) { png_uint_16 a = *(sp + 1); if (a == 0xff) - { - *dp = gamma_table[*sp]; - } + *sp = gamma_table[*sp]; + else if (a == 0) { /* Background is already in screen gamma */ - *dp = (png_byte)background->gray; + *sp = (png_byte)png_ptr->background.gray; } + else { png_byte v, w; v = gamma_to_1[*sp]; - png_composite(w, v, a, background_1->gray); - *dp = gamma_from_1[w]; + png_composite(w, v, a, png_ptr->background_1.gray); + if (!optimize) + w = gamma_from_1[w]; + *sp = w; } } } @@ -2963,27 +3968,15 @@ png_do_background(png_row_infop row_info, png_bytep row, #endif { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 2, dp++) + for (i = 0; i < row_width; i++, sp += 2) { png_byte a = *(sp + 1); - if (a == 0xff) - { - *dp = *sp; - } -#ifdef PNG_READ_GAMMA_SUPPORTED - else if (a == 0) - { - *dp = (png_byte)background->gray; - } - else - { - png_composite(*dp, *sp, a, background_1->gray); - } -#else - *dp = (png_byte)background->gray; -#endif + if (a == 0) + *sp = (png_byte)png_ptr->background.gray; + + else if (a < 0xff) + png_composite(*sp, *sp, a, png_ptr->background.gray); } } } @@ -2994,75 +3987,68 @@ png_do_background(png_row_infop row_info, png_bytep row, gamma_16_to_1 != NULL) { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 4, dp += 2) + for (i = 0; i < row_width; i++, sp += 4) { - png_uint_16 a = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3)); + png_uint_16 a = (png_uint_16)(((*(sp + 2)) << 8) + + *(sp + 3)); if (a == (png_uint_16)0xffff) { png_uint_16 v; v = gamma_16[*(sp + 1) >> gamma_shift][*sp]; - *dp = (png_byte)((v >> 8) & 0xff); - *(dp + 1) = (png_byte)(v & 0xff); + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); } -#ifdef PNG_READ_GAMMA_SUPPORTED + else if (a == 0) -#else - else -#endif { /* Background is already in screen gamma */ - *dp = (png_byte)((background->gray >> 8) & 0xff); - *(dp + 1) = (png_byte)(background->gray & 0xff); + *sp = (png_byte)((png_ptr->background.gray >> 8) + & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff); } -#ifdef PNG_READ_GAMMA_SUPPORTED + else { png_uint_16 g, v, w; g = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp]; - png_composite_16(v, g, a, background_1->gray); - w = gamma_16_from_1[(v&0xff) >> gamma_shift][v >> 8]; - *dp = (png_byte)((w >> 8) & 0xff); - *(dp + 1) = (png_byte)(w & 0xff); + png_composite_16(v, g, a, png_ptr->background_1.gray); + if (optimize) + w = v; + else + w = gamma_16_from_1[(v&0xff) >> gamma_shift][v >> 8]; + *sp = (png_byte)((w >> 8) & 0xff); + *(sp + 1) = (png_byte)(w & 0xff); } -#endif } } else #endif { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 4, dp += 2) + for (i = 0; i < row_width; i++, sp += 4) { - png_uint_16 a = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3)); - if (a == (png_uint_16)0xffff) + png_uint_16 a = (png_uint_16)(((*(sp + 2)) << 8) + + *(sp + 3)); + + if (a == 0) { - png_memcpy(dp, sp, 2); + *sp = (png_byte)((png_ptr->background.gray >> 8) + & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff); } -#ifdef PNG_READ_GAMMA_SUPPORTED - else if (a == 0) -#else - else -#endif - { - *dp = (png_byte)((background->gray >> 8) & 0xff); - *(dp + 1) = (png_byte)(background->gray & 0xff); - } -#ifdef PNG_READ_GAMMA_SUPPORTED - else + + else if (a < 0xffff) { png_uint_16 g, v; g = (png_uint_16)(((*sp) << 8) + *(sp + 1)); - png_composite_16(v, g, a, background_1->gray); - *dp = (png_byte)((v >> 8) & 0xff); - *(dp + 1) = (png_byte)(v & 0xff); + png_composite_16(v, g, a, png_ptr->background.gray); + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); } -#endif } } } @@ -3078,37 +4064,43 @@ png_do_background(png_row_infop row_info, png_bytep row, gamma_table != NULL) { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 4, dp += 3) + for (i = 0; i < row_width; i++, sp += 4) { png_byte a = *(sp + 3); if (a == 0xff) { - *dp = gamma_table[*sp]; - *(dp + 1) = gamma_table[*(sp + 1)]; - *(dp + 2) = gamma_table[*(sp + 2)]; + *sp = gamma_table[*sp]; + *(sp + 1) = gamma_table[*(sp + 1)]; + *(sp + 2) = gamma_table[*(sp + 2)]; } + else if (a == 0) { /* Background is already in screen gamma */ - *dp = (png_byte)background->red; - *(dp + 1) = (png_byte)background->green; - *(dp + 2) = (png_byte)background->blue; + *sp = (png_byte)png_ptr->background.red; + *(sp + 1) = (png_byte)png_ptr->background.green; + *(sp + 2) = (png_byte)png_ptr->background.blue; } + else { png_byte v, w; v = gamma_to_1[*sp]; - png_composite(w, v, a, background_1->red); - *dp = gamma_from_1[w]; + png_composite(w, v, a, png_ptr->background_1.red); + if (!optimize) w = gamma_from_1[w]; + *sp = w; + v = gamma_to_1[*(sp + 1)]; - png_composite(w, v, a, background_1->green); - *(dp + 1) = gamma_from_1[w]; + png_composite(w, v, a, png_ptr->background_1.green); + if (!optimize) w = gamma_from_1[w]; + *(sp + 1) = w; + v = gamma_to_1[*(sp + 2)]; - png_composite(w, v, a, background_1->blue); - *(dp + 2) = gamma_from_1[w]; + png_composite(w, v, a, png_ptr->background_1.blue); + if (!optimize) w = gamma_from_1[w]; + *(sp + 2) = w; } } } @@ -3116,30 +4108,26 @@ png_do_background(png_row_infop row_info, png_bytep row, #endif { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 4, dp += 3) + for (i = 0; i < row_width; i++, sp += 4) { png_byte a = *(sp + 3); - if (a == 0xff) + if (a == 0) { - *dp = *sp; - *(dp + 1) = *(sp + 1); - *(dp + 2) = *(sp + 2); + *sp = (png_byte)png_ptr->background.red; + *(sp + 1) = (png_byte)png_ptr->background.green; + *(sp + 2) = (png_byte)png_ptr->background.blue; } - else if (a == 0) + + else if (a < 0xff) { - *dp = (png_byte)background->red; - *(dp + 1) = (png_byte)background->green; - *(dp + 2) = (png_byte)background->blue; - } - else - { - png_composite(*dp, *sp, a, background->red); - png_composite(*(dp + 1), *(sp + 1), a, - background->green); - png_composite(*(dp + 2), *(sp + 2), a, - background->blue); + png_composite(*sp, *sp, a, png_ptr->background.red); + + png_composite(*(sp + 1), *(sp + 1), a, + png_ptr->background.green); + + png_composite(*(sp + 2), *(sp + 2), a, + png_ptr->background.blue); } } } @@ -3151,80 +4139,98 @@ png_do_background(png_row_infop row_info, png_bytep row, gamma_16_to_1 != NULL) { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 8, dp += 6) + for (i = 0; i < row_width; i++, sp += 8) { png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6)) << 8) + (png_uint_16)(*(sp + 7))); + if (a == (png_uint_16)0xffff) { png_uint_16 v; v = gamma_16[*(sp + 1) >> gamma_shift][*sp]; - *dp = (png_byte)((v >> 8) & 0xff); - *(dp + 1) = (png_byte)(v & 0xff); + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); + v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)]; - *(dp + 2) = (png_byte)((v >> 8) & 0xff); - *(dp + 3) = (png_byte)(v & 0xff); + *(sp + 2) = (png_byte)((v >> 8) & 0xff); + *(sp + 3) = (png_byte)(v & 0xff); + v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)]; - *(dp + 4) = (png_byte)((v >> 8) & 0xff); - *(dp + 5) = (png_byte)(v & 0xff); + *(sp + 4) = (png_byte)((v >> 8) & 0xff); + *(sp + 5) = (png_byte)(v & 0xff); } + else if (a == 0) { /* Background is already in screen gamma */ - *dp = (png_byte)((background->red >> 8) & 0xff); - *(dp + 1) = (png_byte)(background->red & 0xff); - *(dp + 2) = (png_byte)((background->green >> 8) & 0xff); - *(dp + 3) = (png_byte)(background->green & 0xff); - *(dp + 4) = (png_byte)((background->blue >> 8) & 0xff); - *(dp + 5) = (png_byte)(background->blue & 0xff); + *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff); + *(sp + 2) = (png_byte)((png_ptr->background.green >> 8) + & 0xff); + *(sp + 3) = (png_byte)(png_ptr->background.green + & 0xff); + *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8) + & 0xff); + *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff); } + else { - png_uint_16 v, w, x; + png_uint_16 v, w; v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp]; - png_composite_16(w, v, a, background_1->red); - x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8]; - *dp = (png_byte)((x >> 8) & 0xff); - *(dp + 1) = (png_byte)(x & 0xff); + png_composite_16(w, v, a, png_ptr->background_1.red); + if (!optimize) + w = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> + 8]; + *sp = (png_byte)((w >> 8) & 0xff); + *(sp + 1) = (png_byte)(w & 0xff); + v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)]; - png_composite_16(w, v, a, background_1->green); - x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8]; - *(dp + 2) = (png_byte)((x >> 8) & 0xff); - *(dp + 3) = (png_byte)(x & 0xff); + png_composite_16(w, v, a, png_ptr->background_1.green); + if (!optimize) + w = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> + 8]; + + *(sp + 2) = (png_byte)((w >> 8) & 0xff); + *(sp + 3) = (png_byte)(w & 0xff); + v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)]; - png_composite_16(w, v, a, background_1->blue); - x = gamma_16_from_1[(w & 0xff) >> gamma_shift][w >> 8]; - *(dp + 4) = (png_byte)((x >> 8) & 0xff); - *(dp + 5) = (png_byte)(x & 0xff); + png_composite_16(w, v, a, png_ptr->background_1.blue); + if (!optimize) + w = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> + 8]; + + *(sp + 4) = (png_byte)((w >> 8) & 0xff); + *(sp + 5) = (png_byte)(w & 0xff); } } } + else #endif { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 8, dp += 6) + for (i = 0; i < row_width; i++, sp += 8) { png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6)) - << 8) + (png_uint_16)(*(sp + 7))); - if (a == (png_uint_16)0xffff) + << 8) + (png_uint_16)(*(sp + 7))); + + if (a == 0) { - png_memcpy(dp, sp, 6); + *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff); + *(sp + 2) = (png_byte)((png_ptr->background.green >> 8) + & 0xff); + *(sp + 3) = (png_byte)(png_ptr->background.green + & 0xff); + *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8) + & 0xff); + *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff); } - else if (a == 0) - { - *dp = (png_byte)((background->red >> 8) & 0xff); - *(dp + 1) = (png_byte)(background->red & 0xff); - *(dp + 2) = (png_byte)((background->green >> 8) & 0xff); - *(dp + 3) = (png_byte)(background->green & 0xff); - *(dp + 4) = (png_byte)((background->blue >> 8) & 0xff); - *(dp + 5) = (png_byte)(background->blue & 0xff); - } - else + + else if (a < 0xffff) { png_uint_16 v; @@ -3234,15 +4240,17 @@ png_do_background(png_row_infop row_info, png_bytep row, png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8) + *(sp + 5)); - png_composite_16(v, r, a, background->red); - *dp = (png_byte)((v >> 8) & 0xff); - *(dp + 1) = (png_byte)(v & 0xff); - png_composite_16(v, g, a, background->green); - *(dp + 2) = (png_byte)((v >> 8) & 0xff); - *(dp + 3) = (png_byte)(v & 0xff); - png_composite_16(v, b, a, background->blue); - *(dp + 4) = (png_byte)((v >> 8) & 0xff); - *(dp + 5) = (png_byte)(v & 0xff); + png_composite_16(v, r, a, png_ptr->background.red); + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); + + png_composite_16(v, g, a, png_ptr->background.green); + *(sp + 2) = (png_byte)((v >> 8) & 0xff); + *(sp + 3) = (png_byte)(v & 0xff); + + png_composite_16(v, b, a, png_ptr->background.blue); + *(sp + 4) = (png_byte)((v >> 8) & 0xff); + *(sp + 5) = (png_byte)(v & 0xff); } } } @@ -3253,18 +4261,9 @@ png_do_background(png_row_infop row_info, png_bytep row, default: break; } - - if (row_info->color_type & PNG_COLOR_MASK_ALPHA) - { - row_info->color_type &= ~PNG_COLOR_MASK_ALPHA; - row_info->channels--; - row_info->pixel_depth = (png_byte)(row_info->channels * - row_info->bit_depth); - row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width); - } } } -#endif +#endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_READ_ALPHA_MODE_SUPPORTED */ #ifdef PNG_READ_GAMMA_SUPPORTED /* Gamma correct the image, avoiding the alpha channel. Make sure @@ -3274,19 +4273,20 @@ png_do_background(png_row_infop row_info, png_bytep row, * build_gamma_table(). */ void /* PRIVATE */ -png_do_gamma(png_row_infop row_info, png_bytep row, - png_bytep gamma_table, png_uint_16pp gamma_16_table, - int gamma_shift) +png_do_gamma(png_row_infop row_info, png_bytep row, png_structrp png_ptr) { + png_const_bytep gamma_table = png_ptr->gamma_table; + png_const_uint_16pp gamma_16_table = png_ptr->gamma_16_table; + int gamma_shift = png_ptr->gamma_shift; + png_bytep sp; png_uint_32 i; png_uint_32 row_width=row_info->width; png_debug(1, "in png_do_gamma"); - if ( - ((row_info->bit_depth <= 8 && gamma_table != NULL) || - (row_info->bit_depth == 16 && gamma_16_table != NULL))) + if (((row_info->bit_depth <= 8 && gamma_table != NULL) || + (row_info->bit_depth == 16 && gamma_16_table != NULL))) { switch (row_info->color_type) { @@ -3305,6 +4305,7 @@ png_do_gamma(png_row_infop row_info, png_bytep row, sp++; } } + else /* if (row_info->bit_depth == 16) */ { sp = row; @@ -3316,10 +4317,12 @@ png_do_gamma(png_row_infop row_info, png_bytep row, *sp = (png_byte)((v >> 8) & 0xff); *(sp + 1) = (png_byte)(v & 0xff); sp += 2; + v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; *sp = (png_byte)((v >> 8) & 0xff); *(sp + 1) = (png_byte)(v & 0xff); sp += 2; + v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; *sp = (png_byte)((v >> 8) & 0xff); *(sp + 1) = (png_byte)(v & 0xff); @@ -3338,13 +4341,17 @@ png_do_gamma(png_row_infop row_info, png_bytep row, { *sp = gamma_table[*sp]; sp++; + *sp = gamma_table[*sp]; sp++; + *sp = gamma_table[*sp]; sp++; + sp++; } } + else /* if (row_info->bit_depth == 16) */ { sp = row; @@ -3354,10 +4361,12 @@ png_do_gamma(png_row_infop row_info, png_bytep row, *sp = (png_byte)((v >> 8) & 0xff); *(sp + 1) = (png_byte)(v & 0xff); sp += 2; + v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; *sp = (png_byte)((v >> 8) & 0xff); *(sp + 1) = (png_byte)(v & 0xff); sp += 2; + v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; *sp = (png_byte)((v >> 8) & 0xff); *(sp + 1) = (png_byte)(v & 0xff); @@ -3378,6 +4387,7 @@ png_do_gamma(png_row_infop row_info, png_bytep row, sp += 2; } } + else /* if (row_info->bit_depth == 16) */ { sp = row; @@ -3458,13 +4468,80 @@ png_do_gamma(png_row_infop row_info, png_bytep row, } #endif +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED +/* Encode the alpha channel to the output gamma (the input channel is always + * linear.) Called only with color types that have an alpha channel. Needs the + * from_1 tables. + */ +void /* PRIVATE */ +png_do_encode_alpha(png_row_infop row_info, png_bytep row, png_structrp png_ptr) +{ + png_uint_32 row_width = row_info->width; + + png_debug(1, "in png_do_encode_alpha"); + + if (row_info->color_type & PNG_COLOR_MASK_ALPHA) + { + if (row_info->bit_depth == 8) + { + PNG_CONST png_bytep table = png_ptr->gamma_from_1; + + if (table != NULL) + { + PNG_CONST int step = + (row_info->color_type & PNG_COLOR_MASK_COLOR) ? 4 : 2; + + /* The alpha channel is the last component: */ + row += step - 1; + + for (; row_width > 0; --row_width, row += step) + *row = table[*row]; + + return; + } + } + + else if (row_info->bit_depth == 16) + { + PNG_CONST png_uint_16pp table = png_ptr->gamma_16_from_1; + PNG_CONST int gamma_shift = png_ptr->gamma_shift; + + if (table != NULL) + { + PNG_CONST int step = + (row_info->color_type & PNG_COLOR_MASK_COLOR) ? 8 : 4; + + /* The alpha channel is the last component: */ + row += step - 2; + + for (; row_width > 0; --row_width, row += step) + { + png_uint_16 v; + + v = table[*(row + 1) >> gamma_shift][*row]; + *row = (png_byte)((v >> 8) & 0xff); + *(row + 1) = (png_byte)(v & 0xff); + } + + return; + } + } + } + + /* Only get to here if called with a weird row_info; no harm has been done, + * so just issue a warning. + */ + png_warning(png_ptr, "png_do_encode_alpha: unexpected call"); +} +#endif + #ifdef PNG_READ_EXPAND_SUPPORTED /* Expands a palette row to an RGB or RGBA row depending * upon whether you supply trans and num_trans. */ void /* PRIVATE */ png_do_expand_palette(png_row_infop row_info, png_bytep row, - png_colorp palette, png_bytep trans_alpha, int num_trans) + png_const_colorp palette, png_const_bytep trans_alpha, int num_trans) { int shift, value; png_bytep sp, dp; @@ -3473,8 +4550,7 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, png_debug(1, "in png_do_expand_palette"); - if ( - row_info->color_type == PNG_COLOR_TYPE_PALETTE) + if (row_info->color_type == PNG_COLOR_TYPE_PALETTE) { if (row_info->bit_depth < 8) { @@ -3489,13 +4565,16 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, { if ((*sp >> shift) & 0x01) *dp = 1; + else *dp = 0; + if (shift == 7) { shift = 0; sp--; } + else shift++; @@ -3518,6 +4597,7 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, shift = 0; sp--; } + else shift += 2; @@ -3540,6 +4620,7 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, shift = 0; sp--; } + else shift += 4; @@ -3555,11 +4636,11 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, row_info->pixel_depth = 8; row_info->rowbytes = row_width; } - switch (row_info->bit_depth) + + if (row_info->bit_depth == 8) { - case 8: { - if (trans_alpha != NULL) + if (num_trans > 0) { sp = row + (png_size_t)row_width - 1; dp = row + (png_size_t)(row_width << 2) - 1; @@ -3568,8 +4649,10 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, { if ((int)(*sp) >= num_trans) *dp-- = 0xff; + else *dp-- = trans_alpha[*sp]; + *dp-- = palette[*sp].blue; *dp-- = palette[*sp].green; *dp-- = palette[*sp].red; @@ -3581,6 +4664,7 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, row_info->color_type = 6; row_info->channels = 4; } + else { sp = row + (png_size_t)row_width - 1; @@ -3600,7 +4684,6 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, row_info->color_type = 2; row_info->channels = 3; } - break; } } } @@ -3611,7 +4694,7 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row, */ void /* PRIVATE */ png_do_expand(png_row_infop row_info, png_bytep row, - png_color_16p trans_value) + png_const_color_16p trans_color) { int shift, value; png_bytep sp, dp; @@ -3623,7 +4706,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, { if (row_info->color_type == PNG_COLOR_TYPE_GRAY) { - png_uint_16 gray = (png_uint_16)(trans_value ? trans_value->gray : 0); + unsigned int gray = trans_color ? trans_color->gray : 0; if (row_info->bit_depth < 8) { @@ -3631,7 +4714,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, { case 1: { - gray = (png_uint_16)((gray&0x01)*0xff); + gray = (gray & 0x01) * 0xff; sp = row + (png_size_t)((row_width - 1) >> 3); dp = row + (png_size_t)row_width - 1; shift = 7 - (int)((row_width + 7) & 0x07); @@ -3639,13 +4722,16 @@ png_do_expand(png_row_infop row_info, png_bytep row, { if ((*sp >> shift) & 0x01) *dp = 0xff; + else *dp = 0; + if (shift == 7) { shift = 0; sp--; } + else shift++; @@ -3656,7 +4742,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, case 2: { - gray = (png_uint_16)((gray&0x03)*0x55); + gray = (gray & 0x03) * 0x55; sp = row + (png_size_t)((row_width - 1) >> 2); dp = row + (png_size_t)row_width - 1; shift = (int)((3 - ((row_width + 3) & 0x03)) << 1); @@ -3670,6 +4756,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, shift = 0; sp--; } + else shift += 2; @@ -3680,7 +4767,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, case 4: { - gray = (png_uint_16)((gray&0x0f)*0x11); + gray = (gray & 0x0f) * 0x11; sp = row + (png_size_t)((row_width - 1) >> 1); dp = row + (png_size_t)row_width - 1; shift = (int)((1 - ((row_width + 1) & 0x01)) << 2); @@ -3693,6 +4780,7 @@ png_do_expand(png_row_infop row_info, png_bytep row, shift = 0; sp--; } + else shift = 4; @@ -3710,27 +4798,30 @@ png_do_expand(png_row_infop row_info, png_bytep row, row_info->rowbytes = row_width; } - if (trans_value != NULL) + if (trans_color != NULL) { if (row_info->bit_depth == 8) { gray = gray & 0xff; sp = row + (png_size_t)row_width - 1; dp = row + (png_size_t)(row_width << 1) - 1; + for (i = 0; i < row_width; i++) { if (*sp == gray) *dp-- = 0; + else *dp-- = 0xff; + *dp-- = *sp--; } } else if (row_info->bit_depth == 16) { - png_byte gray_high = (gray >> 8) & 0xff; - png_byte gray_low = gray & 0xff; + unsigned int gray_high = (gray >> 8) & 0xff; + unsigned int gray_low = gray & 0xff; sp = row + row_info->rowbytes - 1; dp = row + (row_info->rowbytes << 1) - 1; for (i = 0; i < row_width; i++) @@ -3740,11 +4831,13 @@ png_do_expand(png_row_infop row_info, png_bytep row, *dp-- = 0; *dp-- = 0; } + else { *dp-- = 0xff; *dp-- = 0xff; } + *dp-- = *sp--; *dp-- = *sp--; } @@ -3757,21 +4850,23 @@ png_do_expand(png_row_infop row_info, png_bytep row, row_width); } } - else if (row_info->color_type == PNG_COLOR_TYPE_RGB && trans_value) + else if (row_info->color_type == PNG_COLOR_TYPE_RGB && trans_color) { if (row_info->bit_depth == 8) { - png_byte red = trans_value->red & 0xff; - png_byte green = trans_value->green & 0xff; - png_byte blue = trans_value->blue & 0xff; + png_byte red = (png_byte)(trans_color->red & 0xff); + png_byte green = (png_byte)(trans_color->green & 0xff); + png_byte blue = (png_byte)(trans_color->blue & 0xff); sp = row + (png_size_t)row_info->rowbytes - 1; dp = row + (png_size_t)(row_width << 2) - 1; for (i = 0; i < row_width; i++) { if (*(sp - 2) == red && *(sp - 1) == green && *(sp) == blue) *dp-- = 0; + else *dp-- = 0xff; + *dp-- = *sp--; *dp-- = *sp--; *dp-- = *sp--; @@ -3779,31 +4874,33 @@ png_do_expand(png_row_infop row_info, png_bytep row, } else if (row_info->bit_depth == 16) { - png_byte red_high = (trans_value->red >> 8) & 0xff; - png_byte green_high = (trans_value->green >> 8) & 0xff; - png_byte blue_high = (trans_value->blue >> 8) & 0xff; - png_byte red_low = trans_value->red & 0xff; - png_byte green_low = trans_value->green & 0xff; - png_byte blue_low = trans_value->blue & 0xff; + png_byte red_high = (png_byte)((trans_color->red >> 8) & 0xff); + png_byte green_high = (png_byte)((trans_color->green >> 8) & 0xff); + png_byte blue_high = (png_byte)((trans_color->blue >> 8) & 0xff); + png_byte red_low = (png_byte)(trans_color->red & 0xff); + png_byte green_low = (png_byte)(trans_color->green & 0xff); + png_byte blue_low = (png_byte)(trans_color->blue & 0xff); sp = row + row_info->rowbytes - 1; dp = row + (png_size_t)(row_width << 3) - 1; for (i = 0; i < row_width; i++) { if (*(sp - 5) == red_high && - *(sp - 4) == red_low && - *(sp - 3) == green_high && - *(sp - 2) == green_low && - *(sp - 1) == blue_high && - *(sp ) == blue_low) + *(sp - 4) == red_low && + *(sp - 3) == green_high && + *(sp - 2) == green_low && + *(sp - 1) == blue_high && + *(sp ) == blue_low) { *dp-- = 0; *dp-- = 0; } + else { *dp-- = 0xff; *dp-- = 0xff; } + *dp-- = *sp--; *dp-- = *sp--; *dp-- = *sp--; @@ -3821,10 +4918,41 @@ png_do_expand(png_row_infop row_info, png_bytep row, } #endif +#ifdef PNG_READ_EXPAND_16_SUPPORTED +/* If the bit depth is 8 and the color type is not a palette type expand the + * whole row to 16 bits. Has no effect otherwise. + */ +void /* PRIVATE */ +png_do_expand_16(png_row_infop row_info, png_bytep row) +{ + if (row_info->bit_depth == 8 && + row_info->color_type != PNG_COLOR_TYPE_PALETTE) + { + /* The row have a sequence of bytes containing [0..255] and we need + * to turn it into another row containing [0..65535], to do this we + * calculate: + * + * (input / 255) * 65535 + * + * Which happens to be exactly input * 257 and this can be achieved + * simply by byte replication in place (copying backwards). + */ + png_byte *sp = row + row_info->rowbytes; /* source, last byte + 1 */ + png_byte *dp = sp + row_info->rowbytes; /* destination, end + 1 */ + while (dp > sp) + dp[-2] = dp[-1] = *--sp, dp -= 2; + + row_info->rowbytes *= 2; + row_info->bit_depth = 16; + row_info->pixel_depth = (png_byte)(row_info->channels * 16); + } +} +#endif + #ifdef PNG_READ_QUANTIZE_SUPPORTED void /* PRIVATE */ png_do_quantize(png_row_infop row_info, png_bytep row, - png_bytep palette_lookup, png_bytep quantize_lookup) + png_const_bytep palette_lookup, png_const_bytep quantize_lookup) { png_bytep sp, dp; png_uint_32 i; @@ -3832,9 +4960,9 @@ png_do_quantize(png_row_infop row_info, png_bytep row, png_debug(1, "in png_do_quantize"); + if (row_info->bit_depth == 8) { - if (row_info->color_type == PNG_COLOR_TYPE_RGB && - palette_lookup && row_info->bit_depth == 8) + if (row_info->color_type == PNG_COLOR_TYPE_RGB && palette_lookup) { int r, g, b, p; sp = row; @@ -3853,23 +4981,25 @@ png_do_quantize(png_row_infop row_info, png_bytep row, * ((b >> 3) & 0x1f); */ p = (((r >> (8 - PNG_QUANTIZE_RED_BITS)) & - ((1 << PNG_QUANTIZE_RED_BITS) - 1)) << - (PNG_QUANTIZE_GREEN_BITS + PNG_QUANTIZE_BLUE_BITS)) | - (((g >> (8 - PNG_QUANTIZE_GREEN_BITS)) & - ((1 << PNG_QUANTIZE_GREEN_BITS) - 1)) << - (PNG_QUANTIZE_BLUE_BITS)) | - ((b >> (8 - PNG_QUANTIZE_BLUE_BITS)) & - ((1 << PNG_QUANTIZE_BLUE_BITS) - 1)); + ((1 << PNG_QUANTIZE_RED_BITS) - 1)) << + (PNG_QUANTIZE_GREEN_BITS + PNG_QUANTIZE_BLUE_BITS)) | + (((g >> (8 - PNG_QUANTIZE_GREEN_BITS)) & + ((1 << PNG_QUANTIZE_GREEN_BITS) - 1)) << + (PNG_QUANTIZE_BLUE_BITS)) | + ((b >> (8 - PNG_QUANTIZE_BLUE_BITS)) & + ((1 << PNG_QUANTIZE_BLUE_BITS) - 1)); *dp++ = palette_lookup[p]; } + row_info->color_type = PNG_COLOR_TYPE_PALETTE; row_info->channels = 1; row_info->pixel_depth = row_info->bit_depth; row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width); } + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA && - palette_lookup != NULL && row_info->bit_depth == 8) + palette_lookup != NULL) { int r, g, b, p; sp = row; @@ -3882,25 +5012,28 @@ png_do_quantize(png_row_infop row_info, png_bytep row, sp++; p = (((r >> (8 - PNG_QUANTIZE_RED_BITS)) & - ((1 << PNG_QUANTIZE_RED_BITS) - 1)) << - (PNG_QUANTIZE_GREEN_BITS + PNG_QUANTIZE_BLUE_BITS)) | - (((g >> (8 - PNG_QUANTIZE_GREEN_BITS)) & - ((1 << PNG_QUANTIZE_GREEN_BITS) - 1)) << - (PNG_QUANTIZE_BLUE_BITS)) | - ((b >> (8 - PNG_QUANTIZE_BLUE_BITS)) & - ((1 << PNG_QUANTIZE_BLUE_BITS) - 1)); + ((1 << PNG_QUANTIZE_RED_BITS) - 1)) << + (PNG_QUANTIZE_GREEN_BITS + PNG_QUANTIZE_BLUE_BITS)) | + (((g >> (8 - PNG_QUANTIZE_GREEN_BITS)) & + ((1 << PNG_QUANTIZE_GREEN_BITS) - 1)) << + (PNG_QUANTIZE_BLUE_BITS)) | + ((b >> (8 - PNG_QUANTIZE_BLUE_BITS)) & + ((1 << PNG_QUANTIZE_BLUE_BITS) - 1)); *dp++ = palette_lookup[p]; } + row_info->color_type = PNG_COLOR_TYPE_PALETTE; row_info->channels = 1; row_info->pixel_depth = row_info->bit_depth; row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width); } + else if (row_info->color_type == PNG_COLOR_TYPE_PALETTE && - quantize_lookup && row_info->bit_depth == 8) + quantize_lookup) { sp = row; + for (i = 0; i < row_width; i++, sp++) { *sp = quantize_lookup[*sp]; @@ -3908,266 +5041,8 @@ png_do_quantize(png_row_infop row_info, png_bytep row, } } } -#endif - -#ifdef PNG_FLOATING_POINT_SUPPORTED -#ifdef PNG_READ_GAMMA_SUPPORTED -static PNG_CONST int png_gamma_shift[] = - {0x10, 0x21, 0x42, 0x84, 0x110, 0x248, 0x550, 0xff0, 0x00}; - -/* We build the 8- or 16-bit gamma tables here. Note that for 16-bit - * tables, we don't make a full table if we are reducing to 8-bit in - * the future. Note also how the gamma_16 tables are segmented so that - * we don't need to allocate > 64K chunks for a full 16-bit table. - * - * See the PNG extensions document for an integer algorithm for creating - * the gamma tables. Maybe we will implement that here someday. - * - * We should only reach this point if - * - * the file_gamma is known (i.e., the gAMA or sRGB chunk is present, - * or the application has provided a file_gamma) - * - * AND - * { - * the screen_gamma is known - * - * OR - * - * RGB_to_gray transformation is being performed - * } - * - * AND - * { - * the screen_gamma is different from the reciprocal of the - * file_gamma by more than the specified threshold - * - * OR - * - * a background color has been specified and the file_gamma - * and screen_gamma are not 1.0, within the specified threshold. - * } - */ - -void /* PRIVATE */ -png_build_gamma_table(png_structp png_ptr, png_byte bit_depth) -{ - png_debug(1, "in png_build_gamma_table"); - - if (bit_depth <= 8) - { - int i; - double g; - - if (png_ptr->screen_gamma > .000001) - g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma); - - else - g = 1.0; - - png_ptr->gamma_table = (png_bytep)png_malloc(png_ptr, - (png_uint_32)256); - - for (i = 0; i < 256; i++) - { - png_ptr->gamma_table[i] = (png_byte)(pow((double)i / 255.0, - g) * 255.0 + .5); - } - -#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ - defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) - if (png_ptr->transformations & ((PNG_BACKGROUND) | PNG_RGB_TO_GRAY)) - { - - g = 1.0 / (png_ptr->gamma); - - png_ptr->gamma_to_1 = (png_bytep)png_malloc(png_ptr, - (png_uint_32)256); - - for (i = 0; i < 256; i++) - { - png_ptr->gamma_to_1[i] = (png_byte)(pow((double)i / 255.0, - g) * 255.0 + .5); - } - - - png_ptr->gamma_from_1 = (png_bytep)png_malloc(png_ptr, - (png_uint_32)256); - - if (png_ptr->screen_gamma > 0.000001) - g = 1.0 / png_ptr->screen_gamma; - - else - g = png_ptr->gamma; /* Probably doing rgb_to_gray */ - - for (i = 0; i < 256; i++) - { - png_ptr->gamma_from_1[i] = (png_byte)(pow((double)i / 255.0, - g) * 255.0 + .5); - - } - } -#endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */ - } - else - { - double g; - int i, j, shift, num; - int sig_bit; - png_uint_32 ig; - - if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) - { - sig_bit = (int)png_ptr->sig_bit.red; - - if ((int)png_ptr->sig_bit.green > sig_bit) - sig_bit = png_ptr->sig_bit.green; - - if ((int)png_ptr->sig_bit.blue > sig_bit) - sig_bit = png_ptr->sig_bit.blue; - } - else - { - sig_bit = (int)png_ptr->sig_bit.gray; - } - - if (sig_bit > 0) - shift = 16 - sig_bit; - - else - shift = 0; - - if (png_ptr->transformations & PNG_16_TO_8) - { - if (shift < (16 - PNG_MAX_GAMMA_8)) - shift = (16 - PNG_MAX_GAMMA_8); - } - - if (shift > 8) - shift = 8; - - if (shift < 0) - shift = 0; - - png_ptr->gamma_shift = (png_byte)shift; - - num = (1 << (8 - shift)); - - if (png_ptr->screen_gamma > .000001) - g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma); - else - g = 1.0; - - png_ptr->gamma_16_table = (png_uint_16pp)png_calloc(png_ptr, - (png_uint_32)(num * png_sizeof(png_uint_16p))); - - if (png_ptr->transformations & (PNG_16_TO_8 | PNG_BACKGROUND)) - { - double fin, fout; - png_uint_32 last, max; - - for (i = 0; i < num; i++) - { - png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr, - (png_uint_32)(256 * png_sizeof(png_uint_16))); - } - - g = 1.0 / g; - last = 0; - for (i = 0; i < 256; i++) - { - fout = ((double)i + 0.5) / 256.0; - fin = pow(fout, g); - max = (png_uint_32)(fin * (double)((png_uint_32)num << 8)); - while (last <= max) - { - png_ptr->gamma_16_table[(int)(last & (0xff >> shift))] - [(int)(last >> (8 - shift))] = (png_uint_16)( - (png_uint_16)i | ((png_uint_16)i << 8)); - last++; - } - } - while (last < ((png_uint_32)num << 8)) - { - png_ptr->gamma_16_table[(int)(last & (0xff >> shift))] - [(int)(last >> (8 - shift))] = (png_uint_16)65535L; - last++; - } - } - else - { - for (i = 0; i < num; i++) - { - png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr, - (png_uint_32)(256 * png_sizeof(png_uint_16))); - - ig = (((png_uint_32)i * (png_uint_32)png_gamma_shift[shift]) >> 4); - - for (j = 0; j < 256; j++) - { - png_ptr->gamma_16_table[i][j] = - (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) / - 65535.0, g) * 65535.0 + .5); - } - } - } - -#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ - defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) - if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY)) - { - - g = 1.0 / (png_ptr->gamma); - - png_ptr->gamma_16_to_1 = (png_uint_16pp)png_calloc(png_ptr, - (png_uint_32)(num * png_sizeof(png_uint_16p ))); - - for (i = 0; i < num; i++) - { - png_ptr->gamma_16_to_1[i] = (png_uint_16p)png_malloc(png_ptr, - (png_uint_32)(256 * png_sizeof(png_uint_16))); - - ig = (((png_uint_32)i * - (png_uint_32)png_gamma_shift[shift]) >> 4); - for (j = 0; j < 256; j++) - { - png_ptr->gamma_16_to_1[i][j] = - (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) / - 65535.0, g) * 65535.0 + .5); - } - } - - if (png_ptr->screen_gamma > 0.000001) - g = 1.0 / png_ptr->screen_gamma; - - else - g = png_ptr->gamma; /* Probably doing rgb_to_gray */ - - png_ptr->gamma_16_from_1 = (png_uint_16pp)png_calloc(png_ptr, - (png_uint_32)(num * png_sizeof(png_uint_16p))); - - for (i = 0; i < num; i++) - { - png_ptr->gamma_16_from_1[i] = (png_uint_16p)png_malloc(png_ptr, - (png_uint_32)(256 * png_sizeof(png_uint_16))); - - ig = (((png_uint_32)i * - (png_uint_32)png_gamma_shift[shift]) >> 4); - - for (j = 0; j < 256; j++) - { - png_ptr->gamma_16_from_1[i][j] = - (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) / - 65535.0, g) * 65535.0 + .5); - } - } - } -#endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */ - } -} -#endif -/* To do: install integer version of png_build_gamma_table here */ -#endif +#endif /* PNG_READ_QUANTIZE_SUPPORTED */ +#endif /* PNG_READ_TRANSFORMS_SUPPORTED */ #ifdef PNG_MNG_FEATURES_SUPPORTED /* Undoes intrapixel differencing */ @@ -4181,6 +5056,7 @@ png_do_read_intrapixel(png_row_infop row_info, png_bytep row) { int bytes_per_pixel; png_uint_32 row_width = row_info->width; + if (row_info->bit_depth == 8) { png_bytep rp; @@ -4197,8 +5073,8 @@ png_do_read_intrapixel(png_row_infop row_info, png_bytep row) for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) { - *(rp) = (png_byte)((256 + *rp + *(rp+1))&0xff); - *(rp+2) = (png_byte)((256 + *(rp+2) + *(rp+1))&0xff); + *(rp) = (png_byte)((256 + *rp + *(rp + 1)) & 0xff); + *(rp+2) = (png_byte)((256 + *(rp + 2) + *(rp + 1)) & 0xff); } } else if (row_info->bit_depth == 16) @@ -4220,12 +5096,12 @@ png_do_read_intrapixel(png_row_infop row_info, png_bytep row) png_uint_32 s0 = (*(rp ) << 8) | *(rp + 1); png_uint_32 s1 = (*(rp + 2) << 8) | *(rp + 3); png_uint_32 s2 = (*(rp + 4) << 8) | *(rp + 5); - png_uint_32 red = (png_uint_32)((s0 + s1 + 65536L) & 0xffffL); - png_uint_32 blue = (png_uint_32)((s2 + s1 + 65536L) & 0xffffL); - *(rp ) = (png_byte)((red >> 8) & 0xff); - *(rp+1) = (png_byte)(red & 0xff); - *(rp+4) = (png_byte)((blue >> 8) & 0xff); - *(rp+5) = (png_byte)(blue & 0xff); + png_uint_32 red = (s0 + s1 + 65536) & 0xffff; + png_uint_32 blue = (s2 + s1 + 65536) & 0xffff; + *(rp ) = (png_byte)((red >> 8) & 0xff); + *(rp + 1) = (png_byte)(red & 0xff); + *(rp + 4) = (png_byte)((blue >> 8) & 0xff); + *(rp + 5) = (png_byte)(blue & 0xff); } } } diff --git a/project/jni/png/pngrutil.c b/project/jni/png/pngrutil.c index 646e1fc8e..a0d324f5a 100644 --- a/project/jni/png/pngrutil.c +++ b/project/jni/png/pngrutil.c @@ -1,8 +1,8 @@ /* pngrutil.c - utilities to read a PNG file * - * Last changed in libpng 1.4.6 [January 23, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.4 [September 16, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -14,38 +14,66 @@ * libpng itself during the course of reading an image. */ -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" -#ifdef PNG_READ_SUPPORTED #include "pngpriv.h" -# define png_strtod(p,a,b) strtod(a,b) -png_uint_32 PNGAPI -png_get_uint_31(png_structp png_ptr, png_bytep buf) -{ - png_uint_32 val = png_get_uint_32(buf); +#ifdef PNG_READ_SUPPORTED - if (val > PNG_UINT_31_MAX) - png_error(png_ptr, "PNG unsigned integer out of range"); - return (val); +png_uint_32 PNGAPI +png_get_uint_31(png_const_structrp png_ptr, png_const_bytep buf) +{ + png_uint_32 uval = png_get_uint_32(buf); + + if (uval > PNG_UINT_31_MAX) + png_error(png_ptr, "PNG unsigned integer out of range"); + + return (uval); } -#ifndef PNG_USE_READ_MACROS -/* The parentheses around "PNGAPI function_name" in the following three +#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_READ_cHRM_SUPPORTED) +/* The following is a variation on the above for use with the fixed + * point values used for gAMA and cHRM. Instead of png_error it + * issues a warning and returns (-1) - an invalid value because both + * gAMA and cHRM use *unsigned* integers for fixed point values. + */ +#define PNG_FIXED_ERROR (-1) + +static png_fixed_point /* PRIVATE */ +png_get_fixed_point(png_structrp png_ptr, png_const_bytep buf) +{ + png_uint_32 uval = png_get_uint_32(buf); + + if (uval <= PNG_UINT_31_MAX) + return (png_fixed_point)uval; /* known to be in range */ + + /* The caller can turn off the warning by passing NULL. */ + if (png_ptr != NULL) + png_warning(png_ptr, "PNG fixed point integer out of range"); + + return PNG_FIXED_ERROR; +} +#endif + +#ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED +/* NOTE: the read macros will obscure these definitions, so that if + * PNG_USE_READ_MACROS is set the library will not use them internally, + * but the APIs will still be available externally. + * + * The parentheses around "PNGAPI function_name" in the following three * functions are necessary because they allow the macros to co-exist with * these (unused but exported) functions. */ /* Grab an unsigned 32-bit integer from a buffer in big-endian format. */ png_uint_32 (PNGAPI -png_get_uint_32)(png_bytep buf) +png_get_uint_32)(png_const_bytep buf) { - png_uint_32 uval = png_get_uint_32(buf); - if ((uval & 0x80000000L) == 0) /* non-negative */ - return uval; + png_uint_32 uval = + ((png_uint_32)(*(buf )) << 24) + + ((png_uint_32)(*(buf + 1)) << 16) + + ((png_uint_32)(*(buf + 2)) << 8) + + ((png_uint_32)(*(buf + 3)) ) ; - uval = (uval ^ 0xffffffffL) + 1; /* 2's complement: -x = ~x+1 */ - return -(png_int_32)uval; + return uval; } /* Grab a signed 32-bit integer from a buffer in big-endian format. The @@ -54,19 +82,19 @@ png_get_uint_32)(png_bytep buf) * the following code does a two's complement to native conversion. */ png_int_32 (PNGAPI -png_get_int_32)(png_bytep buf) +png_get_int_32)(png_const_bytep buf) { png_uint_32 uval = png_get_uint_32(buf); - if ((uval & 0x80000000L) == 0) /* non-negative */ + if ((uval & 0x80000000) == 0) /* non-negative */ return uval; - uval = (uval ^ 0xffffffffL) + 1; /* 2's complement: -x = ~x+1 */ + uval = (uval ^ 0xffffffff) + 1; /* 2's complement: -x = ~x+1 */ return -(png_int_32)uval; } /* Grab an unsigned 16-bit integer from a buffer in big-endian format. */ png_uint_16 (PNGAPI -png_get_uint_16)(png_bytep buf) +png_get_uint_16)(png_const_bytep buf) { /* ANSI-C requires an int value to accomodate at least 16 bits so this * works and allows the compiler not to worry about possible narrowing @@ -79,11 +107,12 @@ png_get_uint_16)(png_bytep buf) return (png_uint_16)val; } -#endif /* PNG_USE_READ_MACROS */ + +#endif /* PNG_READ_INT_FUNCTIONS_SUPPORTED */ /* Read and check the PNG file signature */ void /* PRIVATE */ -png_read_sig(png_structp png_ptr, png_infop info_ptr) +png_read_sig(png_structrp png_ptr, png_inforp info_ptr) { png_size_t num_checked, num_to_check; @@ -107,7 +136,6 @@ png_read_sig(png_structp png_ptr, png_infop info_ptr) if (num_checked < 4 && png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) png_error(png_ptr, "Not a PNG file"); - else png_error(png_ptr, "PNG file corrupted by ASCII conversion"); } @@ -119,7 +147,7 @@ png_read_sig(png_structp png_ptr, png_infop info_ptr) * Put the type name into png_ptr->chunk_name, and return the length. */ png_uint_32 /* PRIVATE */ -png_read_chunk_header(png_structp png_ptr) +png_read_chunk_header(png_structrp png_ptr) { png_byte buf[8]; png_uint_32 length; @@ -135,22 +163,19 @@ png_read_chunk_header(png_structp png_ptr) length = png_get_uint_31(png_ptr, buf); /* Put the chunk name into png_ptr->chunk_name. */ - png_memcpy(png_ptr->chunk_name, buf + 4, 4); + png_ptr->chunk_name = PNG_CHUNK_FROM_STRING(buf+4); - png_debug2(0, "Reading %s chunk, length = %lu", - png_ptr->chunk_name, (unsigned long)length); + png_debug2(0, "Reading %lx chunk, length = %lu", + (unsigned long)png_ptr->chunk_name, (unsigned long)length); /* Reset the crc and run it over the chunk name. */ png_reset_crc(png_ptr); - png_calculate_crc(png_ptr, png_ptr->chunk_name, 4); + png_calculate_crc(png_ptr, buf + 4, 4); /* Check to see if chunk name is valid. */ png_check_chunk_name(png_ptr, png_ptr->chunk_name); #ifdef PNG_IO_STATE_SUPPORTED - /* It is unspecified how many I/O calls will be performed - * during the serialization of the chunk data. - */ png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_DATA; #endif @@ -159,7 +184,7 @@ png_read_chunk_header(png_structp png_ptr) /* Read data, and (optionally) run it through the CRC. */ void /* PRIVATE */ -png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length) +png_crc_read(png_structrp png_ptr, png_bytep buf, png_uint_32 length) { if (png_ptr == NULL) return; @@ -169,32 +194,34 @@ png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length) } /* Optionally skip data and then check the CRC. Depending on whether we - * are reading a ancillary or critical chunk, and how the program has set + * are reading an ancillary or critical chunk, and how the program has set * things up, we may calculate the CRC on the data and print a message. * Returns '1' if there was a CRC error, '0' otherwise. */ int /* PRIVATE */ -png_crc_finish(png_structp png_ptr, png_uint_32 skip) +png_crc_finish(png_structrp png_ptr, png_uint_32 skip) { - png_size_t i; - png_size_t istop = png_ptr->zbuf_size; - - for (i = (png_size_t)skip; i > istop; i -= istop) + /* The size of the local buffer for inflate is a good guess as to a + * reasonable size to use for buffering reads from the application. + */ + while (skip > 0) { - png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); - } + png_uint_32 len; + png_byte tmpbuf[PNG_INFLATE_BUF_SIZE]; - if (i) - { - png_crc_read(png_ptr, png_ptr->zbuf, i); + len = (sizeof tmpbuf); + if (len > skip) + len = skip; + skip -= len; + + png_crc_read(png_ptr, tmpbuf, len); } if (png_crc_error(png_ptr)) { - if (((png_ptr->chunk_name[0] & 0x20) && /* Ancillary */ - !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) || - (!(png_ptr->chunk_name[0] & 0x20) && /* Critical */ - (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE))) + if (PNG_CHUNK_ANCILLARY(png_ptr->chunk_name) ? + !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) : + (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE)) { png_chunk_warning(png_ptr, "CRC error"); } @@ -215,20 +242,20 @@ png_crc_finish(png_structp png_ptr, png_uint_32 skip) * the data it has read thus far. */ int /* PRIVATE */ -png_crc_error(png_structp png_ptr) +png_crc_error(png_structrp png_ptr) { png_byte crc_bytes[4]; png_uint_32 crc; int need_crc = 1; - if (png_ptr->chunk_name[0] & 0x20) /* ancillary */ + if (PNG_CHUNK_ANCILLARY(png_ptr->chunk_name)) { if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) == (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN)) need_crc = 0; } - else /* critical */ + else /* critical */ { if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) need_crc = 0; @@ -251,226 +278,521 @@ png_crc_error(png_structp png_ptr) return (0); } -#if defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) || \ - defined(PNG_READ_iCCP_SUPPORTED) -static png_size_t -png_inflate(png_structp png_ptr, const png_byte *data, png_size_t size, - png_bytep output, png_size_t output_size) +/* Manage the read buffer; this simply reallocates the buffer if it is not small + * enough (or if it is not allocated). The routine returns a pointer to the + * buffer; if an error occurs and 'warn' is set the routine returns NULL, else + * it will call png_error (via png_malloc) on failure. (warn == 2 means + * 'silent'). + */ +static png_bytep +png_read_buffer(png_structrp png_ptr, png_alloc_size_t new_size, int warn) { - png_size_t count = 0; + png_bytep buffer = png_ptr->read_buffer; - png_ptr->zstream.next_in = (png_bytep)data; /* const_cast: VALID */ - png_ptr->zstream.avail_in = size; - - while (1) + if (buffer != NULL && new_size > png_ptr->read_buffer_size) { - int ret, avail; + png_ptr->read_buffer = NULL; + png_ptr->read_buffer = NULL; + png_ptr->read_buffer_size = 0; + png_free(png_ptr, buffer); + buffer = NULL; + } - /* Reset the output buffer each time round - we empty it - * after every inflate call. - */ - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = png_ptr->zbuf_size; + if (buffer == NULL) + { + buffer = png_voidcast(png_bytep, png_malloc_base(png_ptr, new_size)); - ret = inflate(&png_ptr->zstream, Z_NO_FLUSH); - avail = png_ptr->zbuf_size - png_ptr->zstream.avail_out; - - /* First copy/count any new output - but only if we didn't - * get an error code. - */ - if ((ret == Z_OK || ret == Z_STREAM_END) && avail > 0) + if (buffer != NULL) { - if (output != 0 && output_size > count) - { - int copy = output_size - count; - if (avail < copy) copy = avail; - png_memcpy(output + count, png_ptr->zbuf, copy); - } + png_ptr->read_buffer = buffer; + png_ptr->read_buffer_size = new_size; + } - count += avail; + else if (warn < 2) /* else silent */ + { +#ifdef PNG_WARNINGS_SUPPORTED + if (warn) + png_chunk_warning(png_ptr, "insufficient memory to read chunk"); + else +#endif + { +#ifdef PNG_ERROR_TEXT_SUPPORTED + png_chunk_error(png_ptr, "insufficient memory to read chunk"); +#endif + } + } + } + + return buffer; +} + +/* png_inflate_claim: claim the zstream for some nefarious purpose that involves + * decompression. Returns Z_OK on success, else a zlib error code. It checks + * the owner but, in final release builds, just issues a warning if some other + * chunk apparently owns the stream. Prior to release it does a png_error. + */ +static int +png_inflate_claim(png_structrp png_ptr, png_uint_32 owner) +{ + if (png_ptr->zowner != 0) + { + char msg[64]; + + PNG_STRING_FROM_CHUNK(msg, png_ptr->zowner); + /* So the message that results is " using zstream"; this is an + * internal error, but is very useful for debugging. i18n requirements + * are minimal. + */ + (void)png_safecat(msg, (sizeof msg), 4, " using zstream"); +# if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC + png_chunk_warning(png_ptr, msg); + png_ptr->zowner = 0; +# else + png_chunk_error(png_ptr, msg); +# endif + } + + /* Implementation note: unlike 'png_deflate_claim' this internal function + * does not take the size of the data as an argument. Some efficiency could + * be gained by using this when it is known *if* the zlib stream itself does + * not record the number; however, this is an illusion: the original writer + * of the PNG may have selected a lower window size, and we really must + * follow that because, for systems with with limited capabilities, we + * would otherwise reject the application's attempts to use a smaller window + * size (zlib doesn't have an interface to say "this or lower"!). + * + * inflateReset2 was added to zlib 1.2.4; before this the window could not be + * reset, therefore it is necessary to always allocate the maximum window + * size with earlier zlibs just in case later compressed chunks need it. + */ + { + int ret; /* zlib return code */ +# if PNG_ZLIB_VERNUM >= 0x1240 + +# if defined(PNG_SET_OPTION_SUPPORTED) && \ + defined(PNG_MAXIMUM_INFLATE_WINDOW) + int window_bits; + + if (((png_ptr->options >> PNG_MAXIMUM_INFLATE_WINDOW) & 3) == + PNG_OPTION_ON) + window_bits = 15; + + else + window_bits = 0; +# else +# define window_bits 0 +# endif +# endif + + /* Set this for safety, just in case the previous owner left pointers to + * memory allocations. + */ + png_ptr->zstream.next_in = NULL; + png_ptr->zstream.avail_in = 0; + png_ptr->zstream.next_out = NULL; + png_ptr->zstream.avail_out = 0; + + if (png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) + { +# if PNG_ZLIB_VERNUM < 0x1240 + ret = inflateReset(&png_ptr->zstream); +# else + ret = inflateReset2(&png_ptr->zstream, window_bits); +# endif + } + + else + { +# if PNG_ZLIB_VERNUM < 0x1240 + ret = inflateInit(&png_ptr->zstream); +# else + ret = inflateInit2(&png_ptr->zstream, window_bits); +# endif + + if (ret == Z_OK) + png_ptr->flags |= PNG_FLAG_ZSTREAM_INITIALIZED; } if (ret == Z_OK) - continue; + png_ptr->zowner = owner; - /* Termination conditions - always reset the zstream, it - * must be left in inflateInit state. + else + png_zstream_error(png_ptr, ret); + + return ret; + } + +# ifdef window_bits +# undef window_bits +# endif +} + +#ifdef PNG_READ_COMPRESSED_TEXT_SUPPORTED +/* png_inflate now returns zlib error codes including Z_OK and Z_STREAM_END to + * allow the caller to do multiple calls if required. If the 'finish' flag is + * set Z_FINISH will be passed to the final inflate() call and Z_STREAM_END must + * be returned or there has been a problem, otherwise Z_SYNC_FLUSH is used and + * Z_OK or Z_STREAM_END will be returned on success. + * + * The input and output sizes are updated to the actual amounts of data consumed + * or written, not the amount available (as in a z_stream). The data pointers + * are not changed, so the next input is (data+input_size) and the next + * available output is (output+output_size). + */ +static int +png_inflate(png_structrp png_ptr, png_uint_32 owner, int finish, + /* INPUT: */ png_const_bytep input, png_uint_32p input_size_ptr, + /* OUTPUT: */ png_bytep output, png_alloc_size_t *output_size_ptr) +{ + if (png_ptr->zowner == owner) /* Else not claimed */ + { + int ret; + png_alloc_size_t avail_out = *output_size_ptr; + png_uint_32 avail_in = *input_size_ptr; + + /* zlib can't necessarily handle more than 65535 bytes at once (i.e. it + * can't even necessarily handle 65536 bytes) because the type uInt is + * "16 bits or more". Consequently it is necessary to chunk the input to + * zlib. This code uses ZLIB_IO_MAX, from pngpriv.h, as the maximum (the + * maximum value that can be stored in a uInt.) It is possible to set + * ZLIB_IO_MAX to a lower value in pngpriv.h and this may sometimes have + * a performance advantage, because it reduces the amount of data accessed + * at each step and that may give the OS more time to page it in. */ + png_ptr->zstream.next_in = PNGZ_INPUT_CAST(input); + /* avail_in and avail_out are set below from 'size' */ png_ptr->zstream.avail_in = 0; - inflateReset(&png_ptr->zstream); + png_ptr->zstream.avail_out = 0; - if (ret == Z_STREAM_END) - return count; /* NOTE: may be zero. */ - - /* Now handle the error codes - the API always returns 0 - * and the error message is dumped into the uncompressed - * buffer if available. + /* Read directly into the output if it is available (this is set to + * a local buffer below if output is NULL). */ + if (output != NULL) + png_ptr->zstream.next_out = output; + + do { - PNG_CONST char *msg; - if (png_ptr->zstream.msg != 0) - msg = png_ptr->zstream.msg; - else + uInt avail; + Byte local_buffer[PNG_INFLATE_BUF_SIZE]; + + /* zlib INPUT BUFFER */ + /* The setting of 'avail_in' used to be outside the loop; by setting it + * inside it is possible to chunk the input to zlib and simply rely on + * zlib to advance the 'next_in' pointer. This allows arbitrary + * amounts of data to be passed through zlib at the unavoidable cost of + * requiring a window save (memcpy of up to 32768 output bytes) + * every ZLIB_IO_MAX input bytes. + */ + avail_in += png_ptr->zstream.avail_in; /* not consumed last time */ + + avail = ZLIB_IO_MAX; + + if (avail_in < avail) + avail = (uInt)avail_in; /* safe: < than ZLIB_IO_MAX */ + + avail_in -= avail; + png_ptr->zstream.avail_in = avail; + + /* zlib OUTPUT BUFFER */ + avail_out += png_ptr->zstream.avail_out; /* not written last time */ + + avail = ZLIB_IO_MAX; /* maximum zlib can process */ + + if (output == NULL) { -#ifdef PNG_STDIO_SUPPORTED - char umsg[52]; - - switch (ret) - { - case Z_BUF_ERROR: - msg = "Buffer error in compressed datastream in %s chunk"; - break; - - case Z_DATA_ERROR: - msg = "Data error in compressed datastream in %s chunk"; - break; - - default: - msg = "Incomplete compressed datastream in %s chunk"; - break; - } - - png_snprintf(umsg, sizeof umsg, msg, png_ptr->chunk_name); - msg = umsg; -#else - msg = "Damaged compressed datastream in chunk other than IDAT"; -#endif + /* Reset the output buffer each time round if output is NULL and + * make available the full buffer, up to 'remaining_space' + */ + png_ptr->zstream.next_out = local_buffer; + if ((sizeof local_buffer) < avail) + avail = (sizeof local_buffer); } - png_warning(png_ptr, msg); - } + if (avail_out < avail) + avail = (uInt)avail_out; /* safe: < ZLIB_IO_MAX */ - /* 0 means an error - notice that this code simple ignores - * zero length compressed chunks as a result. + png_ptr->zstream.avail_out = avail; + avail_out -= avail; + + /* zlib inflate call */ + /* In fact 'avail_out' may be 0 at this point, that happens at the end + * of the read when the final LZ end code was not passed at the end of + * the previous chunk of input data. Tell zlib if we have reached the + * end of the output buffer. + */ + ret = inflate(&png_ptr->zstream, avail_out > 0 ? Z_NO_FLUSH : + (finish ? Z_FINISH : Z_SYNC_FLUSH)); + } while (ret == Z_OK); + + /* For safety kill the local buffer pointer now */ + if (output == NULL) + png_ptr->zstream.next_out = NULL; + + /* Claw back the 'size' and 'remaining_space' byte counts. */ + avail_in += png_ptr->zstream.avail_in; + avail_out += png_ptr->zstream.avail_out; + + /* Update the input and output sizes; the updated values are the amount + * consumed or written, effectively the inverse of what zlib uses. */ - return 0; + if (avail_out > 0) + *output_size_ptr -= avail_out; + + if (avail_in > 0) + *input_size_ptr -= avail_in; + + /* Ensure png_ptr->zstream.msg is set (even in the success case!) */ + png_zstream_error(png_ptr, ret); + return ret; + } + + else + { + /* This is a bad internal error. The recovery assigns to the zstream msg + * pointer, which is not owned by the caller, but this is safe; it's only + * used on errors! + */ + png_ptr->zstream.msg = PNGZ_MSG_CAST("zstream unclaimed"); + return Z_STREAM_ERROR; } } /* - * Decompress trailing data in a chunk. The assumption is that chunkdata + * Decompress trailing data in a chunk. The assumption is that read_buffer * points at an allocated area holding the contents of a chunk with a * trailing compressed part. What we get back is an allocated area * holding the original prefix part and an uncompressed version of the * trailing part (the malloc area passed in is freed). */ -void /* PRIVATE */ -png_decompress_chunk(png_structp png_ptr, int comp_type, - png_size_t chunklength, - png_size_t prefix_size, png_size_t *newlength) +static int +png_decompress_chunk(png_structrp png_ptr, + png_uint_32 chunklength, png_uint_32 prefix_size, + png_alloc_size_t *newlength /* must be initialized to the maximum! */, + int terminate /*add a '\0' to the end of the uncompressed data*/) { - /* The caller should guarantee this */ - if (prefix_size > chunklength) - { - /* The recovery is to delete the chunk. */ - png_warning(png_ptr, "invalid chunklength"); - prefix_size = 0; /* To delete everything */ - } + /* TODO: implement different limits for different types of chunk. + * + * The caller supplies *newlength set to the maximum length of the + * uncompressed data, but this routine allocates space for the prefix and + * maybe a '\0' terminator too. We have to assume that 'prefix_size' is + * limited only by the maximum chunk size. + */ + png_alloc_size_t limit = PNG_SIZE_MAX; - else if (comp_type == PNG_COMPRESSION_TYPE_BASE) - { - png_size_t expanded_size = png_inflate(png_ptr, - (png_bytep)(png_ptr->chunkdata + prefix_size), - chunklength - prefix_size, - 0/*output*/, 0/*output size*/); - - /* Now check the limits on this chunk - if the limit fails the - * compressed data will be removed, the prefix will remain. - */ -#ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED - if (png_ptr->user_chunk_malloc_max && - (prefix_size + expanded_size >= png_ptr->user_chunk_malloc_max - 1)) -#else -# ifdef PNG_USER_CHUNK_MALLOC_MAX - if ((PNG_USER_CHUNK_MALLOC_MAX > 0) && - prefix_size + expanded_size >= PNG_USER_CHUNK_MALLOC_MAX - 1) +# ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED + if (png_ptr->user_chunk_malloc_max > 0 && + png_ptr->user_chunk_malloc_max < limit) + limit = png_ptr->user_chunk_malloc_max; +# elif PNG_USER_CHUNK_MALLOC_MAX > 0 + if (PNG_USER_CHUNK_MALLOC_MAX < limit) + limit = PNG_USER_CHUNK_MALLOC_MAX; # endif -#endif - png_warning(png_ptr, "Exceeded size limit while expanding chunk"); - /* If the size is zero either there was an error and a message - * has already been output (warning) or the size really is zero - * and we have nothing to do - the code will exit through the - * error case below. - */ -#if defined(PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED) || \ - defined(PNG_USER_CHUNK_MALLOC_MAX) - else -#endif - if (expanded_size > 0) + if (limit >= prefix_size + (terminate != 0)) + { + int ret; + + limit -= prefix_size + (terminate != 0); + + if (limit < *newlength) + *newlength = limit; + + /* Now try to claim the stream. */ + ret = png_inflate_claim(png_ptr, png_ptr->chunk_name); + + if (ret == Z_OK) { - /* Success (maybe) - really uncompress the chunk. */ - png_size_t new_size = 0; - png_charp text = png_malloc_warn(png_ptr, - prefix_size + expanded_size + 1); + png_uint_32 lzsize = chunklength - prefix_size; - if (text != NULL) + ret = png_inflate(png_ptr, png_ptr->chunk_name, 1/*finish*/, + /* input: */ png_ptr->read_buffer + prefix_size, &lzsize, + /* output: */ NULL, newlength); + + if (ret == Z_STREAM_END) { - png_memcpy(text, png_ptr->chunkdata, prefix_size); - new_size = png_inflate(png_ptr, - (png_bytep)(png_ptr->chunkdata + prefix_size), - chunklength - prefix_size, - (png_bytep)(text + prefix_size), expanded_size); - text[prefix_size + expanded_size] = 0; /* just in case */ - - if (new_size == expanded_size) + /* Use 'inflateReset' here, not 'inflateReset2' because this + * preserves the previously decided window size (otherwise it would + * be necessary to store the previous window size.) In practice + * this doesn't matter anyway, because png_inflate will call inflate + * with Z_FINISH in almost all cases, so the window will not be + * maintained. + */ + if (inflateReset(&png_ptr->zstream) == Z_OK) { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = text; - *newlength = prefix_size + expanded_size; - return; /* The success return! */ + /* Because of the limit checks above we know that the new, + * expanded, size will fit in a size_t (let alone an + * png_alloc_size_t). Use png_malloc_base here to avoid an + * extra OOM message. + */ + png_alloc_size_t new_size = *newlength; + png_alloc_size_t buffer_size = prefix_size + new_size + + (terminate != 0); + png_bytep text = png_voidcast(png_bytep, png_malloc_base(png_ptr, + buffer_size)); + + if (text != NULL) + { + ret = png_inflate(png_ptr, png_ptr->chunk_name, 1/*finish*/, + png_ptr->read_buffer + prefix_size, &lzsize, + text + prefix_size, newlength); + + if (ret == Z_STREAM_END) + { + if (new_size == *newlength) + { + if (terminate) + text[prefix_size + *newlength] = 0; + + if (prefix_size > 0) + memcpy(text, png_ptr->read_buffer, prefix_size); + + { + png_bytep old_ptr = png_ptr->read_buffer; + + png_ptr->read_buffer = text; + png_ptr->read_buffer_size = buffer_size; + text = old_ptr; /* freed below */ + } + } + + else + { + /* The size changed on the second read, there can be no + * guarantee that anything is correct at this point. + * The 'msg' pointer has been set to "unexpected end of + * LZ stream", which is fine, but return an error code + * that the caller won't accept. + */ + ret = PNG_UNEXPECTED_ZLIB_RETURN; + } + } + + else if (ret == Z_OK) + ret = PNG_UNEXPECTED_ZLIB_RETURN; /* for safety */ + + /* Free the text pointer (this is the old read_buffer on + * success) + */ + png_free(png_ptr, text); + + /* This really is very benign, but it's still an error because + * the extra space may otherwise be used as a Trojan Horse. + */ + if (ret == Z_STREAM_END && + chunklength - prefix_size != lzsize) + png_chunk_benign_error(png_ptr, "extra compressed data"); + } + + else + { + /* Out of memory allocating the buffer */ + ret = Z_MEM_ERROR; + png_zstream_error(png_ptr, Z_MEM_ERROR); + } } - png_warning(png_ptr, "png_inflate logic error"); - png_free(png_ptr, text); + else + { + /* inflateReset failed, store the error message */ + png_zstream_error(png_ptr, ret); + + if (ret == Z_STREAM_END) + ret = PNG_UNEXPECTED_ZLIB_RETURN; + } } - else - png_warning(png_ptr, "Not enough memory to decompress chunk"); + else if (ret == Z_OK) + ret = PNG_UNEXPECTED_ZLIB_RETURN; + + /* Release the claimed stream */ + png_ptr->zowner = 0; } + + else /* the claim failed */ if (ret == Z_STREAM_END) /* impossible! */ + ret = PNG_UNEXPECTED_ZLIB_RETURN; + + return ret; } - else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */ + else { -#ifdef PNG_STDIO_SUPPORTED - char umsg[50]; - - png_snprintf(umsg, sizeof umsg, "Unknown zTXt compression type %d", - comp_type); - png_warning(png_ptr, umsg); -#else - png_warning(png_ptr, "Unknown zTXt compression type"); -#endif - - /* The recovery is to simply drop the data. */ + /* Application/configuration limits exceeded */ + png_zstream_error(png_ptr, Z_MEM_ERROR); + return Z_MEM_ERROR; } +} +#endif /* PNG_READ_COMPRESSED_TEXT_SUPPORTED */ - /* Generic error return - leave the prefix, delete the compressed - * data, reallocate the chunkdata to remove the potentially large - * amount of compressed data. - */ +#ifdef PNG_READ_iCCP_SUPPORTED +/* Perform a partial read and decompress, producing 'avail_out' bytes and + * reading from the current chunk as required. + */ +static int +png_inflate_read(png_structrp png_ptr, png_bytep read_buffer, uInt read_size, + png_uint_32p chunk_bytes, png_bytep next_out, png_alloc_size_t *out_size, + int finish) +{ + if (png_ptr->zowner == png_ptr->chunk_name) { - png_charp text = png_malloc_warn(png_ptr, prefix_size + 1); - if (text != NULL) + int ret; + + /* next_in and avail_in must have been initialized by the caller. */ + png_ptr->zstream.next_out = next_out; + png_ptr->zstream.avail_out = 0; /* set in the loop */ + + do { - if (prefix_size > 0) - png_memcpy(text, png_ptr->chunkdata, prefix_size); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = text; + if (png_ptr->zstream.avail_in == 0) + { + if (read_size > *chunk_bytes) + read_size = (uInt)*chunk_bytes; + *chunk_bytes -= read_size; - /* This is an extra zero in the 'uncompressed' part. */ - *(png_ptr->chunkdata + prefix_size) = 0x00; + if (read_size > 0) + png_crc_read(png_ptr, read_buffer, read_size); + + png_ptr->zstream.next_in = read_buffer; + png_ptr->zstream.avail_in = read_size; + } + + if (png_ptr->zstream.avail_out == 0) + { + uInt avail = ZLIB_IO_MAX; + if (avail > *out_size) + avail = (uInt)*out_size; + *out_size -= avail; + + png_ptr->zstream.avail_out = avail; + } + + /* Use Z_SYNC_FLUSH when there is no more chunk data to ensure that all + * the available output is produced; this allows reading of truncated + * streams. + */ + ret = inflate(&png_ptr->zstream, + *chunk_bytes > 0 ? Z_NO_FLUSH : (finish ? Z_FINISH : Z_SYNC_FLUSH)); } - /* Ignore a malloc error here - it is safe. */ + while (ret == Z_OK && (*out_size > 0 || png_ptr->zstream.avail_out > 0)); + + *out_size += png_ptr->zstream.avail_out; + png_ptr->zstream.avail_out = 0; /* Should not be required, but is safe */ + + /* Ensure the error message pointer is always set: */ + png_zstream_error(png_ptr, ret); + return ret; } - *newlength = prefix_size; + else + { + png_ptr->zstream.msg = PNGZ_MSG_CAST("zstream unclaimed"); + return Z_STREAM_ERROR; + } } #endif /* Read and check the IDHR chunk */ void /* PRIVATE */ -png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_IHDR(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_byte buf[13]; png_uint_32 width, height; @@ -480,11 +802,11 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_debug(1, "in png_handle_IHDR"); if (png_ptr->mode & PNG_HAVE_IHDR) - png_error(png_ptr, "Out of place IHDR"); + png_chunk_error(png_ptr, "out of place"); /* Check the length */ if (length != 13) - png_error(png_ptr, "Invalid IHDR chunk"); + png_chunk_error(png_ptr, "invalid"); png_ptr->mode |= PNG_HAVE_IHDR; @@ -513,6 +835,7 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) /* Find number of channels */ switch (png_ptr->color_type) { + default: /* invalid, png_set_IHDR calls png_error */ case PNG_COLOR_TYPE_GRAY: case PNG_COLOR_TYPE_PALETTE: png_ptr->channels = 1; @@ -537,14 +860,14 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->width); png_debug1(3, "bit_depth = %d", png_ptr->bit_depth); png_debug1(3, "channels = %d", png_ptr->channels); - png_debug1(3, "rowbytes = %lu", png_ptr->rowbytes); + png_debug1(3, "rowbytes = %lu", (unsigned long)png_ptr->rowbytes); png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth, - color_type, interlace_type, compression_type, filter_type); + color_type, interlace_type, compression_type, filter_type); } /* Read and check the palette */ void /* PRIVATE */ -png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_PLTE(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_color palette[PNG_MAX_PALETTE_LENGTH]; int num, i; @@ -555,27 +878,35 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_debug(1, "in png_handle_PLTE"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before PLTE"); + png_chunk_error(png_ptr, "missing IHDR"); + + /* Moved to before the 'after IDAT' check below because otherwise duplicate + * PLTE chunks are potentially ignored (the spec says there shall not be more + * than one PLTE, the error is not treated as benign, so this check trumps + * the requirement that PLTE appears before IDAT.) + */ + else if (png_ptr->mode & PNG_HAVE_PLTE) + png_chunk_error(png_ptr, "duplicate"); else if (png_ptr->mode & PNG_HAVE_IDAT) { - png_warning(png_ptr, "Invalid PLTE after IDAT"); + /* This is benign because the non-benign error happened before, when an + * IDAT was encountered in a color-mapped image with no PLTE. + */ png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } - else if (png_ptr->mode & PNG_HAVE_PLTE) - png_error(png_ptr, "Duplicate PLTE chunk"); - png_ptr->mode |= PNG_HAVE_PLTE; - if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR)) + if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) { - png_warning(png_ptr, - "Ignoring PLTE chunk in grayscale PNG"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "ignored in grayscale PNG"); return; } + #ifndef PNG_READ_OPT_PLTE_SUPPORTED if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE) { @@ -586,19 +917,18 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3) { + png_crc_finish(png_ptr, length); + if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE) - { - png_warning(png_ptr, "Invalid palette chunk"); - png_crc_finish(png_ptr, length); - return; - } + png_chunk_benign_error(png_ptr, "invalid"); else - { - png_error(png_ptr, "Invalid palette chunk"); - } + png_chunk_error(png_ptr, "invalid"); + + return; } + /* The cast is safe because 'length' is less than 3*PNG_MAX_PALETTE_LENGTH */ num = (int)length / 3; #ifdef PNG_POINTER_INDEXING_SUPPORTED @@ -624,7 +954,7 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) } #endif - /* If we actually NEED the PLTE chunk (ie for a paletted image), we do + /* If we actually need the PLTE chunk (ie for a paletted image), we do * whatever the normal CRC configuration tells us. However, if we * have an RGB image, the PLTE can be considered ancillary, so * we will act as though it is. @@ -635,25 +965,33 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) { png_crc_finish(png_ptr, 0); } + #ifndef PNG_READ_OPT_PLTE_SUPPORTED else if (png_crc_error(png_ptr)) /* Only if we have a CRC error */ { /* If we don't want to use the data from an ancillary chunk, - we have two options: an error abort, or a warning and we - ignore the data in this chunk (which should be OK, since - it's considered ancillary for a RGB or RGBA image). */ + * we have two options: an error abort, or a warning and we + * ignore the data in this chunk (which should be OK, since + * it's considered ancillary for a RGB or RGBA image). + * + * IMPLEMENTATION NOTE: this is only here because png_crc_finish uses the + * chunk type to determine whether to check the ancillary or the critical + * flags. + */ if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_USE)) { if (png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) { png_chunk_benign_error(png_ptr, "CRC error"); } + else { png_chunk_warning(png_ptr, "CRC error"); return; } } + /* Otherwise, we (optionally) emit a warning and use the chunk. */ else if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) { @@ -662,136 +1000,114 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) } #endif + /* TODO: png_set_PLTE has the side effect of setting png_ptr->palette to its + * own copy of the palette. This has the side effect that when png_start_row + * is called (this happens after any call to png_read_update_info) the + * info_ptr palette gets changed. This is extremely unexpected and + * confusing. + * + * Fix this by not sharing the palette in this way. + */ png_set_PLTE(png_ptr, info_ptr, palette, num); + /* The three chunks, bKGD, hIST and tRNS *must* appear after PLTE and before + * IDAT. Prior to 1.6.0 this was not checked; instead the code merely + * checked the apparent validity of a tRNS chunk inserted before PLTE on a + * palette PNG. 1.6.0 attempts to rigorously follow the standard and + * therefore does a benign error if the erroneous condition is detected *and* + * cancels the tRNS if the benign error returns. The alternative is to + * amend the standard since it would be rather hypocritical of the standards + * maintainers to ignore it. + */ #ifdef PNG_READ_tRNS_SUPPORTED - if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + if (png_ptr->num_trans > 0 || + (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS) != 0)) { - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) - { - if (png_ptr->num_trans > (png_uint_16)num) - { - png_warning(png_ptr, "Truncating incorrect tRNS chunk length"); - png_ptr->num_trans = (png_uint_16)num; - } - if (info_ptr->num_trans > (png_uint_16)num) - { - png_warning(png_ptr, "Truncating incorrect info tRNS chunk length"); - info_ptr->num_trans = (png_uint_16)num; - } - } + /* Cancel this because otherwise it would be used if the transforms + * require it. Don't cancel the 'valid' flag because this would prevent + * detection of duplicate chunks. + */ + png_ptr->num_trans = 0; + + if (info_ptr != NULL) + info_ptr->num_trans = 0; + + png_chunk_benign_error(png_ptr, "tRNS must be after"); } #endif +#ifdef PNG_READ_hIST_SUPPORTED + if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST) != 0) + png_chunk_benign_error(png_ptr, "hIST must be after"); +#endif + +#ifdef PNG_READ_bKGD_SUPPORTED + if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD) != 0) + png_chunk_benign_error(png_ptr, "bKGD must be after"); +#endif } void /* PRIVATE */ -png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_IEND(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_debug(1, "in png_handle_IEND"); if (!(png_ptr->mode & PNG_HAVE_IHDR) || !(png_ptr->mode & PNG_HAVE_IDAT)) - { - png_error(png_ptr, "No image in file"); - } + png_chunk_error(png_ptr, "out of place"); png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND); - if (length != 0) - { - png_warning(png_ptr, "Incorrect IEND chunk length"); - } png_crc_finish(png_ptr, length); - info_ptr = info_ptr; /* Quiet compiler warnings about unused info_ptr */ + if (length != 0) + png_chunk_benign_error(png_ptr, "invalid"); + + PNG_UNUSED(info_ptr) } #ifdef PNG_READ_gAMA_SUPPORTED void /* PRIVATE */ -png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_gAMA(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_fixed_point igamma; -#ifdef PNG_FLOATING_POINT_SUPPORTED - float file_gamma; -#endif png_byte buf[4]; png_debug(1, "in png_handle_gAMA"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before gAMA"); - else if (png_ptr->mode & PNG_HAVE_IDAT) - { - png_warning(png_ptr, "Invalid gAMA after IDAT"); - png_crc_finish(png_ptr, length); - return; - } - else if (png_ptr->mode & PNG_HAVE_PLTE) - /* Should be an error, but we can cope with it */ - png_warning(png_ptr, "Out of place gAMA chunk"); + png_chunk_error(png_ptr, "missing IHDR"); - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) -#ifdef PNG_READ_sRGB_SUPPORTED - && !(info_ptr->valid & PNG_INFO_sRGB) -#endif - ) + else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) { - png_warning(png_ptr, "Duplicate gAMA chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } if (length != 4) { - png_warning(png_ptr, "Incorrect gAMA chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } png_crc_read(png_ptr, buf, 4); + if (png_crc_finish(png_ptr, 0)) return; - igamma = (png_fixed_point)png_get_uint_32(buf); - /* Check for zero gamma */ - if (igamma == 0) - { - png_warning(png_ptr, - "Ignoring gAMA chunk with gamma=0"); - return; - } + igamma = png_get_fixed_point(NULL, buf); -#ifdef PNG_READ_sRGB_SUPPORTED - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)) - if (PNG_OUT_OF_RANGE(igamma, 45500L, 500)) - { - png_warning(png_ptr, - "Ignoring incorrect gAMA value when sRGB is also present"); -#ifdef PNG_CONSOLE_IO_SUPPORTED - fprintf(stderr, "gamma = (%d/100000)", (int)igamma); -#endif - return; - } -#endif /* PNG_READ_sRGB_SUPPORTED */ - -#ifdef PNG_FLOATING_POINT_SUPPORTED - file_gamma = (float)igamma / (float)100000.0; -# ifdef PNG_READ_GAMMA_SUPPORTED - png_ptr->gamma = file_gamma; -# endif - png_set_gAMA(png_ptr, info_ptr, file_gamma); -#endif -#ifdef PNG_FIXED_POINT_SUPPORTED - png_set_gAMA_fixed(png_ptr, info_ptr, igamma); -#endif + png_colorspace_set_gamma(png_ptr, &png_ptr->colorspace, igamma); + png_colorspace_sync(png_ptr, info_ptr); } #endif #ifdef PNG_READ_sBIT_SUPPORTED void /* PRIVATE */ -png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_sBIT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { - png_size_t truelen; + unsigned int truelen; png_byte buf[4]; png_debug(1, "in png_handle_sBIT"); @@ -799,38 +1115,37 @@ png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) buf[0] = buf[1] = buf[2] = buf[3] = 0; if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before sBIT"); - else if (png_ptr->mode & PNG_HAVE_IDAT) + png_chunk_error(png_ptr, "missing IHDR"); + + else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) { - png_warning(png_ptr, "Invalid sBIT after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } - else if (png_ptr->mode & PNG_HAVE_PLTE) - { - /* Should be an error, but we can cope with it */ - png_warning(png_ptr, "Out of place sBIT chunk"); - } + if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)) { - png_warning(png_ptr, "Duplicate sBIT chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) truelen = 3; + else - truelen = (png_size_t)png_ptr->channels; + truelen = png_ptr->channels; if (length != truelen || length > 4) { - png_warning(png_ptr, "Incorrect sBIT chunk length"); + png_chunk_benign_error(png_ptr, "invalid"); png_crc_finish(png_ptr, length); return; } png_crc_read(png_ptr, buf, truelen); + if (png_crc_finish(png_ptr, 0)) return; @@ -841,6 +1156,7 @@ png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_ptr->sig_bit.blue = buf[2]; png_ptr->sig_bit.alpha = buf[3]; } + else { png_ptr->sig_bit.gray = buf[0]; @@ -849,384 +1165,423 @@ png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_ptr->sig_bit.blue = buf[0]; png_ptr->sig_bit.alpha = buf[1]; } + png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit)); } #endif #ifdef PNG_READ_cHRM_SUPPORTED void /* PRIVATE */ -png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_cHRM(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_byte buf[32]; -#ifdef PNG_FLOATING_POINT_SUPPORTED - float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y; -#endif - png_fixed_point int_x_white, int_y_white, int_x_red, int_y_red, int_x_green, - int_y_green, int_x_blue, int_y_blue; - - png_uint_32 uint_x, uint_y; + png_xy xy; png_debug(1, "in png_handle_cHRM"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before cHRM"); - else if (png_ptr->mode & PNG_HAVE_IDAT) - { - png_warning(png_ptr, "Invalid cHRM after IDAT"); - png_crc_finish(png_ptr, length); - return; - } - else if (png_ptr->mode & PNG_HAVE_PLTE) - /* Should be an error, but we can cope with it */ - png_warning(png_ptr, "Missing PLTE before cHRM"); + png_chunk_error(png_ptr, "missing IHDR"); - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM) -#ifdef PNG_READ_sRGB_SUPPORTED - && !(info_ptr->valid & PNG_INFO_sRGB) -#endif - ) + else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) { - png_warning(png_ptr, "Duplicate cHRM chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } if (length != 32) { - png_warning(png_ptr, "Incorrect cHRM chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } png_crc_read(png_ptr, buf, 32); + if (png_crc_finish(png_ptr, 0)) return; - uint_x = png_get_uint_32(buf); - uint_y = png_get_uint_32(buf + 4); - int_x_white = (png_fixed_point)uint_x; - int_y_white = (png_fixed_point)uint_y; + xy.whitex = png_get_fixed_point(NULL, buf); + xy.whitey = png_get_fixed_point(NULL, buf + 4); + xy.redx = png_get_fixed_point(NULL, buf + 8); + xy.redy = png_get_fixed_point(NULL, buf + 12); + xy.greenx = png_get_fixed_point(NULL, buf + 16); + xy.greeny = png_get_fixed_point(NULL, buf + 20); + xy.bluex = png_get_fixed_point(NULL, buf + 24); + xy.bluey = png_get_fixed_point(NULL, buf + 28); - uint_x = png_get_uint_32(buf + 8); - uint_y = png_get_uint_32(buf + 12); - int_x_red = (png_fixed_point)uint_x; - int_y_red = (png_fixed_point)uint_y; + if (xy.whitex == PNG_FIXED_ERROR || + xy.whitey == PNG_FIXED_ERROR || + xy.redx == PNG_FIXED_ERROR || + xy.redy == PNG_FIXED_ERROR || + xy.greenx == PNG_FIXED_ERROR || + xy.greeny == PNG_FIXED_ERROR || + xy.bluex == PNG_FIXED_ERROR || + xy.bluey == PNG_FIXED_ERROR) + { + png_chunk_benign_error(png_ptr, "invalid values"); + return; + } - uint_x = png_get_uint_32(buf + 16); - uint_y = png_get_uint_32(buf + 20); - int_x_green = (png_fixed_point)uint_x; - int_y_green = (png_fixed_point)uint_y; + /* If a colorspace error has already been output skip this chunk */ + if (png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) + return; - uint_x = png_get_uint_32(buf + 24); - uint_y = png_get_uint_32(buf + 28); - int_x_blue = (png_fixed_point)uint_x; - int_y_blue = (png_fixed_point)uint_y; + if (png_ptr->colorspace.flags & PNG_COLORSPACE_FROM_cHRM) + { + png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID; + png_colorspace_sync(png_ptr, info_ptr); + png_chunk_benign_error(png_ptr, "duplicate"); + return; + } -#ifdef PNG_FLOATING_POINT_SUPPORTED - white_x = (float)int_x_white / (float)100000.0; - white_y = (float)int_y_white / (float)100000.0; - red_x = (float)int_x_red / (float)100000.0; - red_y = (float)int_y_red / (float)100000.0; - green_x = (float)int_x_green / (float)100000.0; - green_y = (float)int_y_green / (float)100000.0; - blue_x = (float)int_x_blue / (float)100000.0; - blue_y = (float)int_y_blue / (float)100000.0; -#endif - -#ifdef PNG_READ_sRGB_SUPPORTED - if ((info_ptr != NULL) && (info_ptr->valid & PNG_INFO_sRGB)) - { - if (PNG_OUT_OF_RANGE(int_x_white, 31270, 1000) || - PNG_OUT_OF_RANGE(int_y_white, 32900, 1000) || - PNG_OUT_OF_RANGE(int_x_red, 64000L, 1000) || - PNG_OUT_OF_RANGE(int_y_red, 33000, 1000) || - PNG_OUT_OF_RANGE(int_x_green, 30000, 1000) || - PNG_OUT_OF_RANGE(int_y_green, 60000L, 1000) || - PNG_OUT_OF_RANGE(int_x_blue, 15000, 1000) || - PNG_OUT_OF_RANGE(int_y_blue, 6000, 1000)) - { - png_warning(png_ptr, - "Ignoring incorrect cHRM value when sRGB is also present"); -#ifdef PNG_CONSOLE_IO_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED - fprintf(stderr, "wx=%f, wy=%f, rx=%f, ry=%f\n", - white_x, white_y, red_x, red_y); - fprintf(stderr, "gx=%f, gy=%f, bx=%f, by=%f\n", - green_x, green_y, blue_x, blue_y); -#else - fprintf(stderr, "wx=%ld, wy=%ld, rx=%ld, ry=%ld\n", - (long)int_x_white, (long)int_y_white, - (long)int_x_red, (long)int_y_red); - fprintf(stderr, "gx=%ld, gy=%ld, bx=%ld, by=%ld\n", - (long)int_x_green, (long)int_y_green, - (long)int_x_blue, (long)int_y_blue); -#endif -#endif /* PNG_CONSOLE_IO_SUPPORTED */ - } - return; - } -#endif /* PNG_READ_sRGB_SUPPORTED */ - -#ifdef PNG_FLOATING_POINT_SUPPORTED - png_set_cHRM(png_ptr, info_ptr, - white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y); -#endif -#ifdef PNG_FIXED_POINT_SUPPORTED - png_set_cHRM_fixed(png_ptr, info_ptr, - int_x_white, int_y_white, int_x_red, int_y_red, int_x_green, - int_y_green, int_x_blue, int_y_blue); -#endif + png_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; + (void)png_colorspace_set_chromaticities(png_ptr, &png_ptr->colorspace, &xy, + 1/*prefer cHRM values*/); + png_colorspace_sync(png_ptr, info_ptr); } #endif #ifdef PNG_READ_sRGB_SUPPORTED void /* PRIVATE */ -png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_sRGB(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { - int intent; - png_byte buf[1]; + png_byte intent; png_debug(1, "in png_handle_sRGB"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before sRGB"); - else if (png_ptr->mode & PNG_HAVE_IDAT) - { - png_warning(png_ptr, "Invalid sRGB after IDAT"); - png_crc_finish(png_ptr, length); - return; - } - else if (png_ptr->mode & PNG_HAVE_PLTE) - /* Should be an error, but we can cope with it */ - png_warning(png_ptr, "Out of place sRGB chunk"); + png_chunk_error(png_ptr, "missing IHDR"); - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)) + else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) { - png_warning(png_ptr, "Duplicate sRGB chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } if (length != 1) { - png_warning(png_ptr, "Incorrect sRGB chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } - png_crc_read(png_ptr, buf, 1); + png_crc_read(png_ptr, &intent, 1); + if (png_crc_finish(png_ptr, 0)) return; - intent = buf[0]; - /* Check for bad intent */ - if (intent >= PNG_sRGB_INTENT_LAST) + /* If a colorspace error has already been output skip this chunk */ + if (png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) + return; + + /* Only one sRGB or iCCP chunk is allowed, use the HAVE_INTENT flag to detect + * this. + */ + if (png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_INTENT) { - png_warning(png_ptr, "Unknown sRGB intent"); + png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID; + png_colorspace_sync(png_ptr, info_ptr); + png_chunk_benign_error(png_ptr, "too many profiles"); return; } -#if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED) - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)) - { - png_fixed_point igamma; -#ifdef PNG_FIXED_POINT_SUPPORTED - igamma=info_ptr->int_gamma; -#else -# ifdef PNG_FLOATING_POINT_SUPPORTED - igamma=(png_fixed_point)(info_ptr->gamma * 100000.); -# endif -#endif - if (PNG_OUT_OF_RANGE(igamma, 45500L, 500)) - { - png_warning(png_ptr, - "Ignoring incorrect gAMA value when sRGB is also present"); -#ifdef PNG_CONSOLE_IO_SUPPORTED -# ifdef PNG_FIXED_POINT_SUPPORTED - fprintf(stderr, "incorrect gamma=(%d/100000)\n", - (int)png_ptr->int_gamma); -# else -# ifdef PNG_FLOATING_POINT_SUPPORTED - fprintf(stderr, "incorrect gamma=%f\n", png_ptr->gamma); -# endif -# endif -#endif - } - } -#endif /* PNG_READ_gAMA_SUPPORTED */ - -#ifdef PNG_READ_cHRM_SUPPORTED -#ifdef PNG_FIXED_POINT_SUPPORTED - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) - if (PNG_OUT_OF_RANGE(info_ptr->int_x_white, 31270, 1000) || - PNG_OUT_OF_RANGE(info_ptr->int_y_white, 32900, 1000) || - PNG_OUT_OF_RANGE(info_ptr->int_x_red, 64000L, 1000) || - PNG_OUT_OF_RANGE(info_ptr->int_y_red, 33000, 1000) || - PNG_OUT_OF_RANGE(info_ptr->int_x_green, 30000, 1000) || - PNG_OUT_OF_RANGE(info_ptr->int_y_green, 60000L, 1000) || - PNG_OUT_OF_RANGE(info_ptr->int_x_blue, 15000, 1000) || - PNG_OUT_OF_RANGE(info_ptr->int_y_blue, 6000, 1000)) - { - png_warning(png_ptr, - "Ignoring incorrect cHRM value when sRGB is also present"); - } -#endif /* PNG_FIXED_POINT_SUPPORTED */ -#endif /* PNG_READ_cHRM_SUPPORTED */ - - png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, intent); + (void)png_colorspace_set_sRGB(png_ptr, &png_ptr->colorspace, intent); + png_colorspace_sync(png_ptr, info_ptr); } #endif /* PNG_READ_sRGB_SUPPORTED */ #ifdef PNG_READ_iCCP_SUPPORTED void /* PRIVATE */ -png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) -/* Note: this does not properly handle chunks that are > 64K under DOS */ +png_handle_iCCP(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) +/* Note: this does not properly handle profiles that are > 64K under DOS */ { - png_byte compression_type; - png_bytep pC; - png_charp profile; - png_uint_32 skip = 0; - png_uint_32 profile_size, profile_length; - png_size_t slength, prefix_length, data_length; + png_const_charp errmsg = NULL; /* error message output, or no error */ + int finished = 0; /* crc checked */ png_debug(1, "in png_handle_iCCP"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before iCCP"); - else if (png_ptr->mode & PNG_HAVE_IDAT) + png_chunk_error(png_ptr, "missing IHDR"); + + else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) { - png_warning(png_ptr, "Invalid iCCP after IDAT"); - png_crc_finish(png_ptr, length); - return; - } - else if (png_ptr->mode & PNG_HAVE_PLTE) - /* Should be an error, but we can cope with it */ - png_warning(png_ptr, "Out of place iCCP chunk"); - - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)) - { - png_warning(png_ptr, "Duplicate iCCP chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } -#ifdef PNG_MAX_MALLOC_64K - if (length > (png_uint_32)65535L) - { - png_warning(png_ptr, "iCCP chunk too large to fit in memory"); - skip = length - (png_uint_32)65535L; - length = (png_uint_32)65535L; - } -#endif - - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1); - slength = (png_size_t)length; - png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); - - if (png_crc_finish(png_ptr, skip)) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } - - png_ptr->chunkdata[slength] = 0x00; - - for (profile = png_ptr->chunkdata; *profile; profile++) - /* Empty loop to find end of name */ ; - - ++profile; - - /* There should be at least one zero (the compression type byte) - * following the separator, and we should be on it + /* Consistent with all the above colorspace handling an obviously *invalid* + * chunk is just ignored, so does not invalidate the color space. An + * alternative is to set the 'invalid' flags at the start of this routine + * and only clear them in they were not set before and all the tests pass. + * The minimum 'deflate' stream is assumed to be just the 2 byte header and 4 + * byte checksum. The keyword must be one character and there is a + * terminator (0) byte and the compression method. */ - if ( profile >= png_ptr->chunkdata + slength - 1) + if (length < 9) { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - png_warning(png_ptr, "Malformed iCCP chunk"); + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "too short"); return; } - /* Compression_type should always be zero */ - compression_type = *profile++; - if (compression_type) + /* If a colorspace error has already been output skip this chunk */ + if (png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) { - png_warning(png_ptr, "Ignoring nonzero compression type in iCCP chunk"); - compression_type = 0x00; /* Reset it to zero (libpng-1.0.6 through 1.0.8 - wrote nonzero) */ - } - - prefix_length = profile - png_ptr->chunkdata; - png_decompress_chunk(png_ptr, compression_type, - slength, prefix_length, &data_length); - - profile_length = data_length - prefix_length; - - if ( prefix_length > data_length || profile_length < 4) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - png_warning(png_ptr, "Profile size field missing from iCCP chunk"); + png_crc_finish(png_ptr, length); return; } - /* Check the profile_size recorded in the first 32 bits of the ICC profile */ - pC = (png_bytep)(png_ptr->chunkdata + prefix_length); - profile_size = ((*(pC ))<<24) | - ((*(pC + 1))<<16) | - ((*(pC + 2))<< 8) | - ((*(pC + 3)) ); - - if (profile_size < profile_length) - profile_length = profile_size; - - if (profile_size > profile_length) + /* Only one sRGB or iCCP chunk is allowed, use the HAVE_INTENT flag to detect + * this. + */ + if ((png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_INTENT) == 0) { -#ifdef PNG_STDIO_SUPPORTED - char umsg[50]; -#endif - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - png_warning(png_ptr, "Ignoring truncated iCCP profile"); -#ifdef PNG_STDIO_SUPPORTED + uInt read_length, keyword_length; + char keyword[81]; - png_snprintf(umsg, 50, "declared profile size = %lu", - (unsigned long)profile_size); - png_warning(png_ptr, umsg); - png_snprintf(umsg, 50, "actual profile length = %lu", - (unsigned long)profile_length); - png_warning(png_ptr, umsg); -#endif - return; + /* Find the keyword; the keyword plus separator and compression method + * bytes can be at most 81 characters long. + */ + read_length = 81; /* maximum */ + if (read_length > length) + read_length = (uInt)length; + + png_crc_read(png_ptr, (png_bytep)keyword, read_length); + length -= read_length; + + keyword_length = 0; + while (keyword_length < 80 && keyword_length < read_length && + keyword[keyword_length] != 0) + ++keyword_length; + + /* TODO: make the keyword checking common */ + if (keyword_length >= 1 && keyword_length <= 79) + { + /* We only understand '0' compression - deflate - so if we get a + * different value we can't safely decode the chunk. + */ + if (keyword_length+1 < read_length && + keyword[keyword_length+1] == PNG_COMPRESSION_TYPE_BASE) + { + read_length -= keyword_length+2; + + if (png_inflate_claim(png_ptr, png_iCCP) == Z_OK) + { + Byte profile_header[132]; + Byte local_buffer[PNG_INFLATE_BUF_SIZE]; + png_alloc_size_t size = (sizeof profile_header); + + png_ptr->zstream.next_in = (Bytef*)keyword + (keyword_length+2); + png_ptr->zstream.avail_in = read_length; + (void)png_inflate_read(png_ptr, local_buffer, + (sizeof local_buffer), &length, profile_header, &size, + 0/*finish: don't, because the output is too small*/); + + if (size == 0) + { + /* We have the ICC profile header; do the basic header checks. + */ + const png_uint_32 profile_length = + png_get_uint_32(profile_header); + + if (png_icc_check_length(png_ptr, &png_ptr->colorspace, + keyword, profile_length)) + { + /* The length is apparently ok, so we can check the 132 + * byte header. + */ + if (png_icc_check_header(png_ptr, &png_ptr->colorspace, + keyword, profile_length, profile_header, + png_ptr->color_type)) + { + /* Now read the tag table; a variable size buffer is + * needed at this point, allocate one for the whole + * profile. The header check has already validated + * that none of these stuff will overflow. + */ + const png_uint_32 tag_count = png_get_uint_32( + profile_header+128); + png_bytep profile = png_read_buffer(png_ptr, + profile_length, 2/*silent*/); + + if (profile != NULL) + { + memcpy(profile, profile_header, + (sizeof profile_header)); + + size = 12 * tag_count; + + (void)png_inflate_read(png_ptr, local_buffer, + (sizeof local_buffer), &length, + profile + (sizeof profile_header), &size, 0); + + /* Still expect a a buffer error because we expect + * there to be some tag data! + */ + if (size == 0) + { + if (png_icc_check_tag_table(png_ptr, + &png_ptr->colorspace, keyword, profile_length, + profile)) + { + /* The profile has been validated for basic + * security issues, so read the whole thing in. + */ + size = profile_length - (sizeof profile_header) + - 12 * tag_count; + + (void)png_inflate_read(png_ptr, local_buffer, + (sizeof local_buffer), &length, + profile + (sizeof profile_header) + + 12 * tag_count, &size, 1/*finish*/); + + if (length > 0 && !(png_ptr->flags & + PNG_FLAG_BENIGN_ERRORS_WARN)) + errmsg = "extra compressed data"; + + /* But otherwise allow extra data: */ + else if (size == 0) + { + if (length > 0) + { + /* This can be handled completely, so + * keep going. + */ + png_chunk_warning(png_ptr, + "extra compressed data"); + } + + png_crc_finish(png_ptr, length); + finished = 1; + +# ifdef PNG_sRGB_SUPPORTED + /* Check for a match against sRGB */ + png_icc_set_sRGB(png_ptr, + &png_ptr->colorspace, profile, + png_ptr->zstream.adler); +# endif + + /* Steal the profile for info_ptr. */ + if (info_ptr != NULL) + { + png_free_data(png_ptr, info_ptr, + PNG_FREE_ICCP, 0); + + info_ptr->iccp_name = png_voidcast(char*, + png_malloc_base(png_ptr, + keyword_length+1)); + if (info_ptr->iccp_name != NULL) + { + memcpy(info_ptr->iccp_name, keyword, + keyword_length+1); + info_ptr->iccp_proflen = + profile_length; + info_ptr->iccp_profile = profile; + png_ptr->read_buffer = NULL; /*steal*/ + info_ptr->free_me |= PNG_FREE_ICCP; + info_ptr->valid |= PNG_INFO_iCCP; + } + + else + { + png_ptr->colorspace.flags |= + PNG_COLORSPACE_INVALID; + errmsg = "out of memory"; + } + } + + /* else the profile remains in the read + * buffer which gets reused for subsequent + * chunks. + */ + + if (info_ptr != NULL) + png_colorspace_sync(png_ptr, info_ptr); + + if (errmsg == NULL) + { + png_ptr->zowner = 0; + return; + } + } + + else if (size > 0) + errmsg = "truncated"; + + else + errmsg = png_ptr->zstream.msg; + } + + /* else png_icc_check_tag_table output an error */ + } + + else /* profile truncated */ + errmsg = png_ptr->zstream.msg; + } + + else + errmsg = "out of memory"; + } + + /* else png_icc_check_header output an error */ + } + + /* else png_icc_check_length output an error */ + } + + else /* profile truncated */ + errmsg = png_ptr->zstream.msg; + + /* Release the stream */ + png_ptr->zowner = 0; + } + + else /* png_inflate_claim failed */ + errmsg = png_ptr->zstream.msg; + } + + else + errmsg = "bad compression method"; /* or missing */ + } + + else + errmsg = "bad keyword"; } - png_set_iCCP(png_ptr, info_ptr, png_ptr->chunkdata, - compression_type, png_ptr->chunkdata + prefix_length, profile_length); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; + else + errmsg = "too many profiles"; + + /* Failure: the reason is in 'errmsg' */ + if (!finished) + png_crc_finish(png_ptr, length); + + png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID; + png_colorspace_sync(png_ptr, info_ptr); + if (errmsg != NULL) /* else already output */ + png_chunk_benign_error(png_ptr, errmsg); } #endif /* PNG_READ_iCCP_SUPPORTED */ #ifdef PNG_READ_sPLT_SUPPORTED void /* PRIVATE */ -png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_sPLT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) /* Note: this does not properly handle chunks that are > 64K under DOS */ { - png_bytep entry_start; + png_bytep entry_start, buffer; png_sPLT_t new_palette; -#ifdef PNG_POINTER_INDEXING_SUPPORTED png_sPLT_entryp pp; -#endif - int data_length, entry_size, i; + png_uint_32 data_length; + int entry_size, i; png_uint_32 skip = 0; - png_size_t slength; + png_uint_32 dl; + png_size_t max_dl; png_debug(1, "in png_handle_sPLT"); #ifdef PNG_USER_LIMITS_SUPPORTED - if (png_ptr->user_chunk_cache_max != 0) { if (png_ptr->user_chunk_cache_max == 1) @@ -1234,6 +1589,7 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_crc_finish(png_ptr, length); return; } + if (--png_ptr->user_chunk_cache_max == 1) { png_warning(png_ptr, "No space in chunk cache for sPLT"); @@ -1244,73 +1600,84 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) #endif if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before sPLT"); + png_chunk_error(png_ptr, "missing IHDR"); + else if (png_ptr->mode & PNG_HAVE_IDAT) { - png_warning(png_ptr, "Invalid sPLT after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } #ifdef PNG_MAX_MALLOC_64K - if (length > (png_uint_32)65535L) + if (length > 65535U) { - png_warning(png_ptr, "sPLT chunk too large to fit in memory"); - skip = length - (png_uint_32)65535L; - length = (png_uint_32)65535L; + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "too large to fit in memory"); + return; } #endif - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1); - slength = (png_size_t)length; - png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); - - if (png_crc_finish(png_ptr, skip)) + buffer = png_read_buffer(png_ptr, length+1, 2/*silent*/); + if (buffer == NULL) { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of memory"); return; } - png_ptr->chunkdata[slength] = 0x00; - for (entry_start = (png_bytep)png_ptr->chunkdata; *entry_start; - entry_start++) + /* WARNING: this may break if size_t is less than 32 bits; it is assumed + * that the PNG_MAX_MALLOC_64K test is enabled in this case, but this is a + * potential breakage point if the types in pngconf.h aren't exactly right. + */ + png_crc_read(png_ptr, buffer, length); + + if (png_crc_finish(png_ptr, skip)) + return; + + buffer[length] = 0; + + for (entry_start = buffer; *entry_start; entry_start++) /* Empty loop to find end of name */ ; + ++entry_start; /* A sample depth should follow the separator, and we should be on it */ - if (entry_start > (png_bytep)png_ptr->chunkdata + slength - 2) + if (entry_start > buffer + length - 2) { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; png_warning(png_ptr, "malformed sPLT chunk"); return; } new_palette.depth = *entry_start++; entry_size = (new_palette.depth == 8 ? 6 : 10); - data_length = (slength - (entry_start - (png_bytep)png_ptr->chunkdata)); + /* This must fit in a png_uint_32 because it is derived from the original + * chunk data length. + */ + data_length = length - (png_uint_32)(entry_start - buffer); /* Integrity-check the data length */ if (data_length % entry_size) { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; png_warning(png_ptr, "sPLT chunk has bad length"); return; } - new_palette.nentries = (png_int_32) ( data_length / entry_size); - if ((png_uint_32) new_palette.nentries > - (png_uint_32) (PNG_SIZE_MAX / png_sizeof(png_sPLT_entry))) + dl = (png_int_32)(data_length / entry_size); + max_dl = PNG_SIZE_MAX / (sizeof (png_sPLT_entry)); + + if (dl > max_dl) { png_warning(png_ptr, "sPLT chunk too long"); return; } + + new_palette.nentries = (png_int_32)(data_length / entry_size); + new_palette.entries = (png_sPLT_entryp)png_malloc_warn( - png_ptr, new_palette.nentries * png_sizeof(png_sPLT_entry)); + png_ptr, new_palette.nentries * (sizeof (png_sPLT_entry))); + if (new_palette.entries == NULL) { png_warning(png_ptr, "sPLT chunk requires too much memory"); @@ -1324,74 +1691,79 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) if (new_palette.depth == 8) { - pp->red = *entry_start++; - pp->green = *entry_start++; - pp->blue = *entry_start++; - pp->alpha = *entry_start++; + pp->red = *entry_start++; + pp->green = *entry_start++; + pp->blue = *entry_start++; + pp->alpha = *entry_start++; } + else { - pp->red = png_get_uint_16(entry_start); entry_start += 2; - pp->green = png_get_uint_16(entry_start); entry_start += 2; - pp->blue = png_get_uint_16(entry_start); entry_start += 2; - pp->alpha = png_get_uint_16(entry_start); entry_start += 2; + pp->red = png_get_uint_16(entry_start); entry_start += 2; + pp->green = png_get_uint_16(entry_start); entry_start += 2; + pp->blue = png_get_uint_16(entry_start); entry_start += 2; + pp->alpha = png_get_uint_16(entry_start); entry_start += 2; } + pp->frequency = png_get_uint_16(entry_start); entry_start += 2; } #else pp = new_palette.entries; + for (i = 0; i < new_palette.nentries; i++) { if (new_palette.depth == 8) { - pp[i].red = *entry_start++; - pp[i].green = *entry_start++; - pp[i].blue = *entry_start++; - pp[i].alpha = *entry_start++; + pp[i].red = *entry_start++; + pp[i].green = *entry_start++; + pp[i].blue = *entry_start++; + pp[i].alpha = *entry_start++; } + else { - pp[i].red = png_get_uint_16(entry_start); entry_start += 2; - pp[i].green = png_get_uint_16(entry_start); entry_start += 2; - pp[i].blue = png_get_uint_16(entry_start); entry_start += 2; - pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2; + pp[i].red = png_get_uint_16(entry_start); entry_start += 2; + pp[i].green = png_get_uint_16(entry_start); entry_start += 2; + pp[i].blue = png_get_uint_16(entry_start); entry_start += 2; + pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2; } - pp->frequency = png_get_uint_16(entry_start); entry_start += 2; + + pp[i].frequency = png_get_uint_16(entry_start); entry_start += 2; } #endif /* Discard all chunk data except the name and stash that */ - new_palette.name = png_ptr->chunkdata; + new_palette.name = (png_charp)buffer; png_set_sPLT(png_ptr, info_ptr, &new_palette, 1); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; png_free(png_ptr, new_palette.entries); } #endif /* PNG_READ_sPLT_SUPPORTED */ #ifdef PNG_READ_tRNS_SUPPORTED void /* PRIVATE */ -png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_tRNS(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_byte readbuf[PNG_MAX_PALETTE_LENGTH]; png_debug(1, "in png_handle_tRNS"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before tRNS"); + png_chunk_error(png_ptr, "missing IHDR"); + else if (png_ptr->mode & PNG_HAVE_IDAT) { - png_warning(png_ptr, "Invalid tRNS after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) { - png_warning(png_ptr, "Duplicate tRNS chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } @@ -1401,8 +1773,8 @@ png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) if (length != 2) { - png_warning(png_ptr, "Incorrect tRNS chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } @@ -1410,49 +1782,51 @@ png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_ptr->num_trans = 1; png_ptr->trans_color.gray = png_get_uint_16(buf); } + else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) { png_byte buf[6]; if (length != 6) { - png_warning(png_ptr, "Incorrect tRNS chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } - png_crc_read(png_ptr, buf, (png_size_t)length); + + png_crc_read(png_ptr, buf, length); png_ptr->num_trans = 1; png_ptr->trans_color.red = png_get_uint_16(buf); png_ptr->trans_color.green = png_get_uint_16(buf + 2); png_ptr->trans_color.blue = png_get_uint_16(buf + 4); } + else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { if (!(png_ptr->mode & PNG_HAVE_PLTE)) { - /* Should be an error, but we can cope with it. */ - png_warning(png_ptr, "Missing PLTE before tRNS"); - } - if (length > (png_uint_32)png_ptr->num_palette || - length > PNG_MAX_PALETTE_LENGTH) - { - png_warning(png_ptr, "Incorrect tRNS chunk length"); + /* TODO: is this actually an error in the ISO spec? */ png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } - if (length == 0) + + if (length > png_ptr->num_palette || length > PNG_MAX_PALETTE_LENGTH || + length == 0) { - png_warning(png_ptr, "Zero length tRNS chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } - png_crc_read(png_ptr, readbuf, (png_size_t)length); + + png_crc_read(png_ptr, readbuf, length); png_ptr->num_trans = (png_uint_16)length; } + else { - png_warning(png_ptr, "tRNS chunk not allowed with alpha channel"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid with alpha channel"); return; } @@ -1462,103 +1836,118 @@ png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) return; } + /* TODO: this is a horrible side effect in the palette case because the + * png_struct ends up with a pointer to the tRNS buffer owned by the + * png_info. Fix this. + */ png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans, - &(png_ptr->trans_color)); + &(png_ptr->trans_color)); } #endif #ifdef PNG_READ_bKGD_SUPPORTED void /* PRIVATE */ -png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_bKGD(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { - png_size_t truelen; + unsigned int truelen; png_byte buf[6]; + png_color_16 background; png_debug(1, "in png_handle_bKGD"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before bKGD"); - else if (png_ptr->mode & PNG_HAVE_IDAT) + png_chunk_error(png_ptr, "missing IHDR"); + + else if ((png_ptr->mode & PNG_HAVE_IDAT) || + (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + !(png_ptr->mode & PNG_HAVE_PLTE))) { - png_warning(png_ptr, "Invalid bKGD after IDAT"); - png_crc_finish(png_ptr, length); - return; - } - else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && - !(png_ptr->mode & PNG_HAVE_PLTE)) - { - png_warning(png_ptr, "Missing PLTE before bKGD"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)) { - png_warning(png_ptr, "Duplicate bKGD chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) truelen = 1; + else if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) truelen = 6; + else truelen = 2; if (length != truelen) { - png_warning(png_ptr, "Incorrect bKGD chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } png_crc_read(png_ptr, buf, truelen); + if (png_crc_finish(png_ptr, 0)) return; /* We convert the index value into RGB components so that we can allow * arbitrary RGB values for background when we have transparency, and * so it is easy to determine the RGB values of the background color - * from the info_ptr struct. */ + * from the info_ptr struct. + */ if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { - png_ptr->background.index = buf[0]; + background.index = buf[0]; + if (info_ptr && info_ptr->num_palette) { - if (buf[0] >= info_ptr->num_palette) - { - png_warning(png_ptr, "Incorrect bKGD chunk index value"); - return; - } - png_ptr->background.red = - (png_uint_16)png_ptr->palette[buf[0]].red; - png_ptr->background.green = - (png_uint_16)png_ptr->palette[buf[0]].green; - png_ptr->background.blue = - (png_uint_16)png_ptr->palette[buf[0]].blue; + if (buf[0] >= info_ptr->num_palette) + { + png_chunk_benign_error(png_ptr, "invalid index"); + return; + } + + background.red = (png_uint_16)png_ptr->palette[buf[0]].red; + background.green = (png_uint_16)png_ptr->palette[buf[0]].green; + background.blue = (png_uint_16)png_ptr->palette[buf[0]].blue; } - } - else if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) /* GRAY */ - { - png_ptr->background.red = - png_ptr->background.green = - png_ptr->background.blue = - png_ptr->background.gray = png_get_uint_16(buf); - } - else - { - png_ptr->background.red = png_get_uint_16(buf); - png_ptr->background.green = png_get_uint_16(buf + 2); - png_ptr->background.blue = png_get_uint_16(buf + 4); + + else + background.red = background.green = background.blue = 0; + + background.gray = 0; } - png_set_bKGD(png_ptr, info_ptr, &(png_ptr->background)); + else if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) /* GRAY */ + { + background.index = 0; + background.red = + background.green = + background.blue = + background.gray = png_get_uint_16(buf); + } + + else + { + background.index = 0; + background.red = png_get_uint_16(buf); + background.green = png_get_uint_16(buf + 2); + background.blue = png_get_uint_16(buf + 4); + background.gray = 0; + } + + png_set_bKGD(png_ptr, info_ptr, &background); } #endif #ifdef PNG_READ_hIST_SUPPORTED void /* PRIVATE */ -png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_hIST(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { unsigned int num, i; png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH]; @@ -1566,32 +1955,28 @@ png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_debug(1, "in png_handle_hIST"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before hIST"); - else if (png_ptr->mode & PNG_HAVE_IDAT) + png_chunk_error(png_ptr, "missing IHDR"); + + else if ((png_ptr->mode & PNG_HAVE_IDAT) || !(png_ptr->mode & PNG_HAVE_PLTE)) { - png_warning(png_ptr, "Invalid hIST after IDAT"); - png_crc_finish(png_ptr, length); - return; - } - else if (!(png_ptr->mode & PNG_HAVE_PLTE)) - { - png_warning(png_ptr, "Missing PLTE before hIST"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)) { - png_warning(png_ptr, "Duplicate hIST chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } num = length / 2 ; - if (num != (unsigned int) png_ptr->num_palette || num > - (unsigned int) PNG_MAX_PALETTE_LENGTH) + + if (num != png_ptr->num_palette || num > PNG_MAX_PALETTE_LENGTH) { - png_warning(png_ptr, "Incorrect hIST chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } @@ -1612,7 +1997,7 @@ png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) #ifdef PNG_READ_pHYs_SUPPORTED void /* PRIVATE */ -png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_pHYs(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_byte buf[9]; png_uint_32 res_x, res_y; @@ -1621,28 +2006,31 @@ png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_debug(1, "in png_handle_pHYs"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before pHYs"); + png_chunk_error(png_ptr, "missing IHDR"); + else if (png_ptr->mode & PNG_HAVE_IDAT) { - png_warning(png_ptr, "Invalid pHYs after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) { - png_warning(png_ptr, "Duplicate pHYs chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } if (length != 9) { - png_warning(png_ptr, "Incorrect pHYs chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } png_crc_read(png_ptr, buf, 9); + if (png_crc_finish(png_ptr, 0)) return; @@ -1655,7 +2043,7 @@ png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) #ifdef PNG_READ_oFFs_SUPPORTED void /* PRIVATE */ -png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_oFFs(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_byte buf[9]; png_int_32 offset_x, offset_y; @@ -1664,28 +2052,31 @@ png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_debug(1, "in png_handle_oFFs"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before oFFs"); + png_chunk_error(png_ptr, "missing IHDR"); + else if (png_ptr->mode & PNG_HAVE_IDAT) { - png_warning(png_ptr, "Invalid oFFs after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) { - png_warning(png_ptr, "Duplicate oFFs chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } if (length != 9) { - png_warning(png_ptr, "Incorrect oFFs chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } png_crc_read(png_ptr, buf, 9); + if (png_crc_finish(png_ptr, 0)) return; @@ -1699,66 +2090,64 @@ png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) #ifdef PNG_READ_pCAL_SUPPORTED /* Read the pCAL chunk (described in the PNG Extensions document) */ void /* PRIVATE */ -png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_pCAL(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_int_32 X0, X1; png_byte type, nparams; - png_charp buf, units, endptr; + png_bytep buffer, buf, units, endptr; png_charpp params; - png_size_t slength; int i; png_debug(1, "in png_handle_pCAL"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before pCAL"); + png_chunk_error(png_ptr, "missing IHDR"); + else if (png_ptr->mode & PNG_HAVE_IDAT) { - png_warning(png_ptr, "Invalid pCAL after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)) { - png_warning(png_ptr, "Duplicate pCAL chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } - png_debug1(2, "Allocating and reading pCAL chunk data (%lu bytes)", - (unsigned long)(length + 1)); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); - if (png_ptr->chunkdata == NULL) - { - png_warning(png_ptr, "No memory for pCAL purpose"); - return; - } - slength = (png_size_t)length; - png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + png_debug1(2, "Allocating and reading pCAL chunk data (%u bytes)", + length + 1); + + buffer = png_read_buffer(png_ptr, length+1, 2/*silent*/); + + if (buffer == NULL) + { + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of memory"); + return; + } + + png_crc_read(png_ptr, buffer, length); if (png_crc_finish(png_ptr, 0)) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; return; - } - png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */ + buffer[length] = 0; /* Null terminate the last string */ png_debug(3, "Finding end of pCAL purpose string"); - for (buf = png_ptr->chunkdata; *buf; buf++) + for (buf = buffer; *buf; buf++) /* Empty loop */ ; - endptr = png_ptr->chunkdata + slength; + endptr = buffer + length; /* We need to have at least 12 bytes after the purpose string - in order to get the parameter information. */ + * in order to get the parameter information. + */ if (endptr <= buf + 12) { - png_warning(png_ptr, "Invalid pCAL data"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; + png_chunk_benign_error(png_ptr, "invalid"); return; } @@ -1771,61 +2160,58 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_debug(3, "Checking pCAL equation type and number of parameters"); /* Check that we have the right number of parameters for known - equation types. */ + * equation types. + */ if ((type == PNG_EQUATION_LINEAR && nparams != 2) || (type == PNG_EQUATION_BASE_E && nparams != 3) || (type == PNG_EQUATION_ARBITRARY && nparams != 3) || (type == PNG_EQUATION_HYPERBOLIC && nparams != 4)) { - png_warning(png_ptr, "Invalid pCAL parameters for equation type"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; + png_chunk_benign_error(png_ptr, "invalid parameter count"); return; } + else if (type >= PNG_EQUATION_LAST) { - png_warning(png_ptr, "Unrecognized equation type for pCAL chunk"); + png_chunk_benign_error(png_ptr, "unrecognized equation type"); } for (buf = units; *buf; buf++) /* Empty loop to move past the units string. */ ; png_debug(3, "Allocating pCAL parameters array"); - params = (png_charpp)png_malloc_warn(png_ptr, - (png_size_t)(nparams * png_sizeof(png_charp))); + + params = png_voidcast(png_charpp, png_malloc_warn(png_ptr, + nparams * (sizeof (png_charp)))); + if (params == NULL) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - png_warning(png_ptr, "No memory for pCAL params"); - return; - } + { + png_chunk_benign_error(png_ptr, "out of memory"); + return; + } /* Get pointers to the start of each parameter string. */ - for (i = 0; i < (int)nparams; i++) + for (i = 0; i < nparams; i++) { buf++; /* Skip the null string terminator from previous parameter. */ png_debug1(3, "Reading pCAL parameter %d", i); - for (params[i] = buf; buf <= endptr && *buf != 0x00; buf++) + + for (params[i] = (png_charp)buf; buf <= endptr && *buf != 0; buf++) /* Empty loop to move past each parameter string */ ; /* Make sure we haven't run out of data yet */ if (buf > endptr) { - png_warning(png_ptr, "Invalid pCAL data"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; png_free(png_ptr, params); + png_chunk_benign_error(png_ptr, "invalid data"); return; } } - png_set_pCAL(png_ptr, info_ptr, png_ptr->chunkdata, X0, X1, type, nparams, - units, params); + png_set_pCAL(png_ptr, info_ptr, (png_charp)buffer, X0, X1, type, nparams, + (png_charp)units, params); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; png_free(png_ptr, params); } #endif @@ -1833,158 +2219,100 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) #ifdef PNG_READ_sCAL_SUPPORTED /* Read the sCAL chunk */ void /* PRIVATE */ -png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_sCAL(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { - png_charp ep; -#ifdef PNG_FLOATING_POINT_SUPPORTED - double width, height; - png_charp vp; -#else -#ifdef PNG_FIXED_POINT_SUPPORTED - png_charp swidth, sheight; -#endif -#endif - png_size_t slength; + png_bytep buffer; + png_size_t i; + int state; png_debug(1, "in png_handle_sCAL"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before sCAL"); + png_chunk_error(png_ptr, "missing IHDR"); + else if (png_ptr->mode & PNG_HAVE_IDAT) { - png_warning(png_ptr, "Invalid sCAL after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL)) { - png_warning(png_ptr, "Duplicate sCAL chunk"); + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); + return; + } + + /* Need unit type, width, \0, height: minimum 4 bytes */ + else if (length < 4) + { + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); + return; + } + + png_debug1(2, "Allocating and reading sCAL chunk data (%u bytes)", + length + 1); + + buffer = png_read_buffer(png_ptr, length+1, 2/*silent*/); + + if (buffer == NULL) + { + png_chunk_benign_error(png_ptr, "out of memory"); png_crc_finish(png_ptr, length); return; } - png_debug1(2, "Allocating and reading sCAL chunk data (%lu bytes)", - (unsigned long)(length + 1)); - png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); - if (png_ptr->chunkdata == NULL) - { - png_warning(png_ptr, "Out of memory while processing sCAL chunk"); - png_crc_finish(png_ptr, length); - return; - } - slength = (png_size_t)length; - png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + png_crc_read(png_ptr, buffer, length); + buffer[length] = 0; /* Null terminate the last string */ if (png_crc_finish(png_ptr, 0)) + return; + + /* Validate the unit. */ + if (buffer[0] != 1 && buffer[0] != 2) { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; + png_chunk_benign_error(png_ptr, "invalid unit"); return; } - png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */ + /* Validate the ASCII numbers, need two ASCII numbers separated by + * a '\0' and they need to fit exactly in the chunk data. + */ + i = 1; + state = 0; - ep = png_ptr->chunkdata + 1; /* Skip unit byte */ + if (!png_check_fp_number((png_const_charp)buffer, length, &state, &i) || + i >= length || buffer[i++] != 0) + png_chunk_benign_error(png_ptr, "bad width format"); -#ifdef PNG_FLOATING_POINT_SUPPORTED - width = png_strtod(png_ptr, ep, &vp); - if (*vp) + else if (!PNG_FP_IS_POSITIVE(state)) + png_chunk_benign_error(png_ptr, "non-positive width"); + + else { - png_warning(png_ptr, "malformed width string in sCAL chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; + png_size_t heighti = i; + + state = 0; + if (!png_check_fp_number((png_const_charp)buffer, length, &state, &i) || + i != length) + png_chunk_benign_error(png_ptr, "bad height format"); + + else if (!PNG_FP_IS_POSITIVE(state)) + png_chunk_benign_error(png_ptr, "non-positive height"); + + else + /* This is the (only) success case. */ + png_set_sCAL_s(png_ptr, info_ptr, buffer[0], + (png_charp)buffer+1, (png_charp)buffer+heighti); } -#else -#ifdef PNG_FIXED_POINT_SUPPORTED - swidth = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1); - if (swidth == NULL) - { - png_warning(png_ptr, "Out of memory while processing sCAL chunk width"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } - png_memcpy(swidth, ep, png_strlen(ep)); -#endif -#endif - - for (ep = png_ptr->chunkdata; *ep; ep++) - /* Empty loop */ ; - ep++; - - if (png_ptr->chunkdata + slength < ep) - { - png_warning(png_ptr, "Truncated sCAL chunk"); -#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) - png_free(png_ptr, swidth); -#endif - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } - -#ifdef PNG_FLOATING_POINT_SUPPORTED - height = png_strtod(png_ptr, ep, &vp); - if (*vp) - { - png_warning(png_ptr, "malformed height string in sCAL chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } -#else -#ifdef PNG_FIXED_POINT_SUPPORTED - sheight = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1); - if (sheight == NULL) - { - png_warning(png_ptr, "Out of memory while processing sCAL chunk height"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - png_free(png_ptr, swidth); - return; - } - png_memcpy(sheight, ep, png_strlen(ep)); -#endif -#endif - - if (png_ptr->chunkdata + slength < ep -#ifdef PNG_FLOATING_POINT_SUPPORTED - || width <= 0. || height <= 0. -#endif - ) - { - png_warning(png_ptr, "Invalid sCAL data"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; -#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) - png_free(png_ptr, swidth); - png_free(png_ptr, sheight); -#endif - return; - } - - -#ifdef PNG_FLOATING_POINT_SUPPORTED - png_set_sCAL(png_ptr, info_ptr, png_ptr->chunkdata[0], width, height); -#else -#ifdef PNG_FIXED_POINT_SUPPORTED - png_set_sCAL_s(png_ptr, info_ptr, png_ptr->chunkdata[0], swidth, sheight); -#endif -#endif - - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; -#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) - png_free(png_ptr, swidth); - png_free(png_ptr, sheight); -#endif } #endif #ifdef PNG_READ_tIME_SUPPORTED void /* PRIVATE */ -png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_tIME(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_byte buf[7]; png_time mod_time; @@ -1992,11 +2320,12 @@ png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_debug(1, "in png_handle_tIME"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Out of place tIME chunk"); + png_chunk_error(png_ptr, "missing IHDR"); + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)) { - png_warning(png_ptr, "Duplicate tIME chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } @@ -2005,12 +2334,13 @@ png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) if (length != 7) { - png_warning(png_ptr, "Incorrect tIME chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } png_crc_read(png_ptr, buf, 7); + if (png_crc_finish(png_ptr, 0)) return; @@ -2028,14 +2358,13 @@ png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) #ifdef PNG_READ_tEXt_SUPPORTED /* Note: this does not properly handle chunks that are > 64K under DOS */ void /* PRIVATE */ -png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_tEXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { - png_textp text_ptr; + png_text text_info; + png_bytep buffer; png_charp key; png_charp text; png_uint_32 skip = 0; - png_size_t slength; - int ret; png_debug(1, "in png_handle_tEXt"); @@ -2047,97 +2376,74 @@ png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_crc_finish(png_ptr, length); return; } + if (--png_ptr->user_chunk_cache_max == 1) { - png_warning(png_ptr, "No space in chunk cache for tEXt"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "no space in chunk cache"); return; } } #endif if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before tEXt"); + png_chunk_error(png_ptr, "missing IHDR"); if (png_ptr->mode & PNG_HAVE_IDAT) png_ptr->mode |= PNG_AFTER_IDAT; #ifdef PNG_MAX_MALLOC_64K - if (length > (png_uint_32)65535L) + if (length > 65535U) { - png_warning(png_ptr, "tEXt chunk too large to fit in memory"); - skip = length - (png_uint_32)65535L; - length = (png_uint_32)65535L; + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "too large to fit in memory"); + return; } #endif - png_free(png_ptr, png_ptr->chunkdata); + buffer = png_read_buffer(png_ptr, length+1, 1/*warn*/); - png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); - if (png_ptr->chunkdata == NULL) + if (buffer == NULL) { - png_warning(png_ptr, "No memory to process text chunk"); + png_chunk_benign_error(png_ptr, "out of memory"); return; } - slength = (png_size_t)length; - png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + + png_crc_read(png_ptr, buffer, length); if (png_crc_finish(png_ptr, skip)) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; return; - } - key = png_ptr->chunkdata; - - key[slength] = 0x00; + key = (png_charp)buffer; + key[length] = 0; for (text = key; *text; text++) /* Empty loop to find end of key */ ; - if (text != key + slength) + if (text != key + length) text++; - text_ptr = (png_textp)png_malloc_warn(png_ptr, - png_sizeof(png_text)); - if (text_ptr == NULL) - { - png_warning(png_ptr, "Not enough memory to process text chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } - text_ptr->compression = PNG_TEXT_COMPRESSION_NONE; - text_ptr->key = key; -#ifdef PNG_iTXt_SUPPORTED - text_ptr->lang = NULL; - text_ptr->lang_key = NULL; - text_ptr->itxt_length = 0; -#endif - text_ptr->text = text; - text_ptr->text_length = png_strlen(text); + text_info.compression = PNG_TEXT_COMPRESSION_NONE; + text_info.key = key; + text_info.lang = NULL; + text_info.lang_key = NULL; + text_info.itxt_length = 0; + text_info.text = text; + text_info.text_length = strlen(text); - ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); - - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - png_free(png_ptr, text_ptr); - if (ret) - png_warning(png_ptr, "Insufficient memory to process text chunk"); + if (png_set_text_2(png_ptr, info_ptr, &text_info, 1)) + png_warning(png_ptr, "Insufficient memory to process text chunk"); } #endif #ifdef PNG_READ_zTXt_SUPPORTED /* Note: this does not correctly handle chunks that are > 64K under DOS */ void /* PRIVATE */ -png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_zTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { - png_textp text_ptr; - png_charp text; - int comp_type; - int ret; - png_size_t slength, prefix_len, data_len; + png_const_charp errmsg = NULL; + png_bytep buffer; + png_uint_32 keyword_length; png_debug(1, "in png_handle_zTXt"); @@ -2149,116 +2455,104 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_crc_finish(png_ptr, length); return; } + if (--png_ptr->user_chunk_cache_max == 1) { - png_warning(png_ptr, "No space in chunk cache for zTXt"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "no space in chunk cache"); return; } } #endif if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before zTXt"); + png_chunk_error(png_ptr, "missing IHDR"); if (png_ptr->mode & PNG_HAVE_IDAT) png_ptr->mode |= PNG_AFTER_IDAT; -#ifdef PNG_MAX_MALLOC_64K - /* We will no doubt have problems with chunks even half this size, but - there is no hard and fast rule to tell us where to stop. */ - if (length > (png_uint_32)65535L) - { - png_warning(png_ptr, "zTXt chunk too large to fit in memory"); - png_crc_finish(png_ptr, length); - return; - } -#endif + buffer = png_read_buffer(png_ptr, length, 2/*silent*/); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); - if (png_ptr->chunkdata == NULL) + if (buffer == NULL) { - png_warning(png_ptr, "Out of memory processing zTXt chunk"); - return; + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of memory"); + return; } - slength = (png_size_t)length; - png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + + png_crc_read(png_ptr, buffer, length); + if (png_crc_finish(png_ptr, 0)) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; return; - } - png_ptr->chunkdata[slength] = 0x00; + /* TODO: also check that the keyword contents match the spec! */ + for (keyword_length = 0; + keyword_length < length && buffer[keyword_length] != 0; + ++keyword_length) + /* Empty loop to find end of name */ ; - for (text = png_ptr->chunkdata; *text; text++) - /* Empty loop */ ; + if (keyword_length > 79 || keyword_length < 1) + errmsg = "bad keyword"; + + /* zTXt must have some LZ data after the keyword, although it may expand to + * zero bytes; we need a '\0' at the end of the keyword, the compression type + * then the LZ data: + */ + else if (keyword_length + 3 > length) + errmsg = "truncated"; + + else if (buffer[keyword_length+1] != PNG_COMPRESSION_TYPE_BASE) + errmsg = "unknown compression type"; - /* zTXt must have some text after the chunkdataword */ - if (text >= png_ptr->chunkdata + slength - 2) - { - png_warning(png_ptr, "Truncated zTXt chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } else { - comp_type = *(++text); - if (comp_type != PNG_TEXT_COMPRESSION_zTXt) - { - png_warning(png_ptr, "Unknown compression type in zTXt chunk"); - comp_type = PNG_TEXT_COMPRESSION_zTXt; - } - text++; /* Skip the compression_method byte */ + png_alloc_size_t uncompressed_length = PNG_SIZE_MAX; + + /* TODO: at present png_decompress_chunk imposes a single application + * level memory limit, this should be split to different values for iCCP + * and text chunks. + */ + if (png_decompress_chunk(png_ptr, length, keyword_length+2, + &uncompressed_length, 1/*terminate*/) == Z_STREAM_END) + { + png_text text; + + /* It worked; png_ptr->read_buffer now looks like a tEXt chunk except + * for the extra compression type byte and the fact that it isn't + * necessarily '\0' terminated. + */ + buffer = png_ptr->read_buffer; + buffer[uncompressed_length+(keyword_length+2)] = 0; + + text.compression = PNG_TEXT_COMPRESSION_zTXt; + text.key = (png_charp)buffer; + text.text = (png_charp)(buffer + keyword_length+2); + text.text_length = uncompressed_length; + text.itxt_length = 0; + text.lang = NULL; + text.lang_key = NULL; + + if (png_set_text_2(png_ptr, info_ptr, &text, 1)) + errmsg = "insufficient memory"; + } + + else + errmsg = png_ptr->zstream.msg; } - prefix_len = text - png_ptr->chunkdata; - png_decompress_chunk(png_ptr, comp_type, - (png_size_t)length, prefix_len, &data_len); - - text_ptr = (png_textp)png_malloc_warn(png_ptr, - png_sizeof(png_text)); - if (text_ptr == NULL) - { - png_warning(png_ptr, "Not enough memory to process zTXt chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } - text_ptr->compression = comp_type; - text_ptr->key = png_ptr->chunkdata; -#ifdef PNG_iTXt_SUPPORTED - text_ptr->lang = NULL; - text_ptr->lang_key = NULL; - text_ptr->itxt_length = 0; -#endif - text_ptr->text = png_ptr->chunkdata + prefix_len; - text_ptr->text_length = data_len; - - ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); - - png_free(png_ptr, text_ptr); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - if (ret) - png_error(png_ptr, "Insufficient memory to store zTXt chunk"); + if (errmsg != NULL) + png_chunk_benign_error(png_ptr, errmsg); } #endif #ifdef PNG_READ_iTXt_SUPPORTED /* Note: this does not correctly handle chunks that are > 64K under DOS */ void /* PRIVATE */ -png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_iTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { - png_textp text_ptr; - png_charp key, lang, text, lang_key; - int comp_flag; - int comp_type = 0; - int ret; - png_size_t slength, prefix_len, data_len; + png_const_charp errmsg = NULL; + png_bytep buffer; + png_uint_32 prefix_length; png_debug(1, "in png_handle_iTXt"); @@ -2270,491 +2564,923 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) png_crc_finish(png_ptr, length); return; } + if (--png_ptr->user_chunk_cache_max == 1) { - png_warning(png_ptr, "No space in chunk cache for iTXt"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "no space in chunk cache"); return; } } #endif if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before iTXt"); + png_chunk_error(png_ptr, "missing IHDR"); if (png_ptr->mode & PNG_HAVE_IDAT) png_ptr->mode |= PNG_AFTER_IDAT; -#ifdef PNG_MAX_MALLOC_64K - /* We will no doubt have problems with chunks even half this size, but - there is no hard and fast rule to tell us where to stop. */ - if (length > (png_uint_32)65535L) - { - png_warning(png_ptr, "iTXt chunk too large to fit in memory"); - png_crc_finish(png_ptr, length); - return; - } -#endif + buffer = png_read_buffer(png_ptr, length+1, 1/*warn*/); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); - if (png_ptr->chunkdata == NULL) + if (buffer == NULL) { - png_warning(png_ptr, "No memory to process iTXt chunk"); - return; + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of memory"); + return; } - slength = (png_size_t)length; - png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + + png_crc_read(png_ptr, buffer, length); + if (png_crc_finish(png_ptr, 0)) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; return; - } - png_ptr->chunkdata[slength] = 0x00; - - for (lang = png_ptr->chunkdata; *lang; lang++) + /* First the keyword. */ + for (prefix_length=0; + prefix_length < length && buffer[prefix_length] != 0; + ++prefix_length) /* Empty loop */ ; - lang++; /* Skip NUL separator */ - /* iTXt must have a language tag (possibly empty), two compression bytes, - * translated keyword (possibly empty), and possibly some text after the - * keyword + /* Perform a basic check on the keyword length here. */ + if (prefix_length > 79 || prefix_length < 1) + errmsg = "bad keyword"; + + /* Expect keyword, compression flag, compression type, language, translated + * keyword (both may be empty but are 0 terminated) then the text, which may + * be empty. */ + else if (prefix_length + 5 > length) + errmsg = "truncated"; - if (lang >= png_ptr->chunkdata + slength - 3) + else if (buffer[prefix_length+1] == 0 || + (buffer[prefix_length+1] == 1 && + buffer[prefix_length+2] == PNG_COMPRESSION_TYPE_BASE)) { - png_warning(png_ptr, "Truncated iTXt chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; + int compressed = buffer[prefix_length+1] != 0; + png_uint_32 language_offset, translated_keyword_offset; + png_alloc_size_t uncompressed_length = 0; + + /* Now the language tag */ + prefix_length += 3; + language_offset = prefix_length; + + for (; prefix_length < length && buffer[prefix_length] != 0; + ++prefix_length) + /* Empty loop */ ; + + /* WARNING: the length may be invalid here, this is checked below. */ + translated_keyword_offset = ++prefix_length; + + for (; prefix_length < length && buffer[prefix_length] != 0; + ++prefix_length) + /* Empty loop */ ; + + /* prefix_length should now be at the trailing '\0' of the translated + * keyword, but it may already be over the end. None of this arithmetic + * can overflow because chunks are at most 2^31 bytes long, but on 16-bit + * systems the available allocaton may overflow. + */ + ++prefix_length; + + if (!compressed && prefix_length <= length) + uncompressed_length = length - prefix_length; + + else if (compressed && prefix_length < length) + { + uncompressed_length = PNG_SIZE_MAX; + + /* TODO: at present png_decompress_chunk imposes a single application + * level memory limit, this should be split to different values for + * iCCP and text chunks. + */ + if (png_decompress_chunk(png_ptr, length, prefix_length, + &uncompressed_length, 1/*terminate*/) == Z_STREAM_END) + buffer = png_ptr->read_buffer; + + else + errmsg = png_ptr->zstream.msg; + } + + else + errmsg = "truncated"; + + if (errmsg == NULL) + { + png_text text; + + buffer[uncompressed_length+prefix_length] = 0; + + if (compressed) + text.compression = PNG_ITXT_COMPRESSION_NONE; + + else + text.compression = PNG_ITXT_COMPRESSION_zTXt; + + text.key = (png_charp)buffer; + text.lang = (png_charp)buffer + language_offset; + text.lang_key = (png_charp)buffer + translated_keyword_offset; + text.text = (png_charp)buffer + prefix_length; + text.text_length = 0; + text.itxt_length = uncompressed_length; + + if (png_set_text_2(png_ptr, info_ptr, &text, 1)) + errmsg = "insufficient memory"; + } } + else - { - comp_flag = *lang++; - comp_type = *lang++; - } + errmsg = "bad compression info"; - for (lang_key = lang; *lang_key; lang_key++) - /* Empty loop */ ; - lang_key++; /* Skip NUL separator */ - - if (lang_key >= png_ptr->chunkdata + slength) - { - png_warning(png_ptr, "Truncated iTXt chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } - - for (text = lang_key; *text; text++) - /* Empty loop */ ; - text++; /* Skip NUL separator */ - if (text >= png_ptr->chunkdata + slength) - { - png_warning(png_ptr, "Malformed iTXt chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } - - prefix_len = text - png_ptr->chunkdata; - - key=png_ptr->chunkdata; - if (comp_flag) - png_decompress_chunk(png_ptr, comp_type, - (size_t)length, prefix_len, &data_len); - else - data_len = png_strlen(png_ptr->chunkdata + prefix_len); - text_ptr = (png_textp)png_malloc_warn(png_ptr, - png_sizeof(png_text)); - if (text_ptr == NULL) - { - png_warning(png_ptr, "Not enough memory to process iTXt chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } - text_ptr->compression = (int)comp_flag + 1; - text_ptr->lang_key = png_ptr->chunkdata + (lang_key - key); - text_ptr->lang = png_ptr->chunkdata + (lang - key); - text_ptr->itxt_length = data_len; - text_ptr->text_length = 0; - text_ptr->key = png_ptr->chunkdata; - text_ptr->text = png_ptr->chunkdata + prefix_len; - - ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); - - png_free(png_ptr, text_ptr); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - if (ret) - png_error(png_ptr, "Insufficient memory to store iTXt chunk"); + if (errmsg != NULL) + png_chunk_benign_error(png_ptr, errmsg); } #endif -/* This function is called when we haven't found a handler for a - chunk. If there isn't a problem with the chunk itself (ie bad - chunk name, CRC, or a critical chunk), the chunk is silently ignored - -- unless the PNG_FLAG_UNKNOWN_CHUNKS_SUPPORTED flag is on in which - case it will be saved away to be written out later. */ -void /* PRIVATE */ -png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED +/* Utility function for png_handle_unknown; set up png_ptr::unknown_chunk */ +static int +png_cache_unknown_chunk(png_structrp png_ptr, png_uint_32 length) { - png_uint_32 skip = 0; + png_alloc_size_t limit = PNG_SIZE_MAX; + + if (png_ptr->unknown_chunk.data != NULL) + { + png_free(png_ptr, png_ptr->unknown_chunk.data); + png_ptr->unknown_chunk.data = NULL; + } + +# ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED + if (png_ptr->user_chunk_malloc_max > 0 && + png_ptr->user_chunk_malloc_max < limit) + limit = png_ptr->user_chunk_malloc_max; + +# elif PNG_USER_CHUNK_MALLOC_MAX > 0 + if (PNG_USER_CHUNK_MALLOC_MAX < limit) + limit = PNG_USER_CHUNK_MALLOC_MAX; +# endif + + if (length <= limit) + { + PNG_CSTRING_FROM_CHUNK(png_ptr->unknown_chunk.name, png_ptr->chunk_name); + /* The following is safe because of the PNG_SIZE_MAX init above */ + png_ptr->unknown_chunk.size = (png_size_t)length/*SAFE*/; + /* 'mode' is a flag array, only the bottom four bits matter here */ + png_ptr->unknown_chunk.location = (png_byte)png_ptr->mode/*SAFE*/; + + if (length == 0) + png_ptr->unknown_chunk.data = NULL; + + else + { + /* Do a 'warn' here - it is handled below. */ + png_ptr->unknown_chunk.data = png_voidcast(png_bytep, + png_malloc_warn(png_ptr, length)); + } + } + + if (png_ptr->unknown_chunk.data == NULL && length > 0) + { + /* This is benign because we clean up correctly */ + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "unknown chunk exceeds memory limits"); + return 0; + } + + else + { + if (length > 0) + png_crc_read(png_ptr, png_ptr->unknown_chunk.data, length); + png_crc_finish(png_ptr, 0); + return 1; + } +} +#endif /* PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */ + +/* Handle an unknown, or known but disabled, chunk */ +void /* PRIVATE */ +png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr, + png_uint_32 length, int keep) +{ + int handled = 0; /* the chunk was handled */ png_debug(1, "in png_handle_unknown"); -#ifdef PNG_USER_LIMITS_SUPPORTED - if (png_ptr->user_chunk_cache_max != 0) - { - if (png_ptr->user_chunk_cache_max == 1) - { - png_crc_finish(png_ptr, length); - return; - } - if (--png_ptr->user_chunk_cache_max == 1) - { - png_warning(png_ptr, "No space in chunk cache for unknown chunk"); - png_crc_finish(png_ptr, length); - return; - } - } -#endif - - if (png_ptr->mode & PNG_HAVE_IDAT) - { - PNG_IDAT; - if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* Not an IDAT */ - png_ptr->mode |= PNG_AFTER_IDAT; - } - - if (!(png_ptr->chunk_name[0] & 0x20)) - { -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != - PNG_HANDLE_CHUNK_ALWAYS -#ifdef PNG_READ_USER_CHUNKS_SUPPORTED - && png_ptr->read_user_chunk_fn == NULL -#endif - ) -#endif - png_chunk_error(png_ptr, "unknown critical chunk"); - } + /* NOTE: this code is based on the code in libpng-1.4.12 except for fixing + * the bug which meant that setting a non-default behavior for a specific + * chunk would be ignored (the default was always used unless a user + * callback was installed). + * + * 'keep' is the value from the png_chunk_unknown_handling, the setting for + * this specific chunk_name, if PNG_HANDLE_AS_UNKNOWN_SUPPORTED, if not it + * will always be PNG_HANDLE_CHUNK_AS_DEFAULT and it needs to be set here. + * This is just an optimization to avoid multiple calls to the lookup + * function. + */ +# ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + keep = png_chunk_unknown_handling(png_ptr, png_ptr->chunk_name); +# endif + /* One of the following methods will read the chunk or skip it (at least one + * of these is always defined because this is the only way to switch on + * PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) + */ #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED - if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) -#ifdef PNG_READ_USER_CHUNKS_SUPPORTED - || (png_ptr->read_user_chunk_fn != NULL) -#endif - ) - { -#ifdef PNG_MAX_MALLOC_64K - if (length > (png_uint_32)65535L) - { - png_warning(png_ptr, "unknown chunk too large to fit in memory"); - skip = length - (png_uint_32)65535L; - length = (png_uint_32)65535L; - } -#endif - png_memcpy((png_charp)png_ptr->unknown_chunk.name, - (png_charp)png_ptr->chunk_name, - png_sizeof(png_ptr->unknown_chunk.name)); - png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name)-1] - = '\0'; - png_ptr->unknown_chunk.size = (png_size_t)length; - if (length == 0) - png_ptr->unknown_chunk.data = NULL; - else - { - png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length); - png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length); - } -#ifdef PNG_READ_USER_CHUNKS_SUPPORTED - if (png_ptr->read_user_chunk_fn != NULL) - { - /* Callback to user unknown chunk handler */ - int ret; - ret = (*(png_ptr->read_user_chunk_fn)) - (png_ptr, &png_ptr->unknown_chunk); - if (ret < 0) - png_chunk_error(png_ptr, "error in user chunk"); - if (ret == 0) - { - if (!(png_ptr->chunk_name[0] & 0x20)) -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != - PNG_HANDLE_CHUNK_ALWAYS) -#endif - png_chunk_error(png_ptr, "unknown critical chunk"); - png_set_unknown_chunks(png_ptr, info_ptr, - &png_ptr->unknown_chunk, 1); - } - } - else -#endif - png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1); - png_free(png_ptr, png_ptr->unknown_chunk.data); - png_ptr->unknown_chunk.data = NULL; - } - else -#endif - skip = length; +# ifdef PNG_READ_USER_CHUNKS_SUPPORTED + /* The user callback takes precedence over the chunk keep value, but the + * keep value is still required to validate a save of a critical chunk. + */ + if (png_ptr->read_user_chunk_fn != NULL) + { + if (png_cache_unknown_chunk(png_ptr, length)) + { + /* Callback to user unknown chunk handler */ + int ret = (*(png_ptr->read_user_chunk_fn))(png_ptr, + &png_ptr->unknown_chunk); - png_crc_finish(png_ptr, skip); + /* ret is: + * negative: An error occured, png_chunk_error will be called. + * zero: The chunk was not handled, the chunk will be discarded + * unless png_set_keep_unknown_chunks has been used to set + * a 'keep' behavior for this particular chunk, in which + * case that will be used. A critical chunk will cause an + * error at this point unless it is to be saved. + * positive: The chunk was handled, libpng will ignore/discard it. + */ + if (ret < 0) + png_chunk_error(png_ptr, "error in user chunk"); -#ifndef PNG_READ_USER_CHUNKS_SUPPORTED - info_ptr = info_ptr; /* Quiet compiler warnings about unused info_ptr */ -#endif + else if (ret == 0) + { + /* If the keep value is 'default' or 'never' override it, but + * still error out on critical chunks unless the keep value is + * 'always' While this is weird it is the behavior in 1.4.12. + * A possible improvement would be to obey the value set for the + * chunk, but this would be an API change that would probably + * damage some applications. + * + * The png_app_warning below catches the case that matters, where + * the application has not set specific save or ignore for this + * chunk or global save or ignore. + */ + if (keep < PNG_HANDLE_CHUNK_IF_SAFE) + { +# ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED + if (png_ptr->unknown_default < PNG_HANDLE_CHUNK_IF_SAFE) + { + png_chunk_warning(png_ptr, "Saving unknown chunk:"); + png_app_warning(png_ptr, + "forcing save of an unhandled chunk;" + " please call png_set_keep_unknown_chunks"); + /* with keep = PNG_HANDLE_CHUNK_IF_SAFE */ + } +# endif + keep = PNG_HANDLE_CHUNK_IF_SAFE; + } + } + + else /* chunk was handled */ + { + handled = 1; + /* Critical chunks can be safely discarded at this point. */ + keep = PNG_HANDLE_CHUNK_NEVER; + } + } + + else + keep = PNG_HANDLE_CHUNK_NEVER; /* insufficient memory */ + } + + else + /* Use the SAVE_UNKNOWN_CHUNKS code or skip the chunk */ +# endif /* PNG_READ_USER_CHUNKS_SUPPORTED */ + +# ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED + { + /* keep is currently just the per-chunk setting, if there was no + * setting change it to the global default now (not that this may + * still be AS_DEFAULT) then obtain the cache of the chunk if required, + * if not simply skip the chunk. + */ + if (keep == PNG_HANDLE_CHUNK_AS_DEFAULT) + keep = png_ptr->unknown_default; + + if (keep == PNG_HANDLE_CHUNK_ALWAYS || + (keep == PNG_HANDLE_CHUNK_IF_SAFE && + PNG_CHUNK_ANCILLARY(png_ptr->chunk_name))) + { + if (!png_cache_unknown_chunk(png_ptr, length)) + keep = PNG_HANDLE_CHUNK_NEVER; + } + + else + png_crc_finish(png_ptr, length); + } +# else +# ifndef PNG_READ_USER_CHUNKS_SUPPORTED +# error no method to support READ_UNKNOWN_CHUNKS +# endif + + { + /* If here there is no read callback pointer set and no support is + * compiled in to just save the unknown chunks, so simply skip this + * chunk. If 'keep' is something other than AS_DEFAULT or NEVER then + * the app has erroneously asked for unknown chunk saving when there + * is no support. + */ + if (keep > PNG_HANDLE_CHUNK_NEVER) + png_app_error(png_ptr, "no unknown chunk support available"); + + png_crc_finish(png_ptr, length); + } +# endif /* PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED */ + +# ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED + /* Now store the chunk in the chunk list if appropriate, and if the limits + * permit it. + */ + if (keep == PNG_HANDLE_CHUNK_ALWAYS || + (keep == PNG_HANDLE_CHUNK_IF_SAFE && + PNG_CHUNK_ANCILLARY(png_ptr->chunk_name))) + { +# ifdef PNG_USER_LIMITS_SUPPORTED + switch (png_ptr->user_chunk_cache_max) + { + case 2: + png_ptr->user_chunk_cache_max = 1; + png_chunk_benign_error(png_ptr, "no space in chunk cache"); + /* FALL THROUGH */ + case 1: + /* NOTE: prior to 1.6.0 this case resulted in an unknown critical + * chunk being skipped, now there will be a hard error below. + */ + break; + + default: /* not at limit */ + --(png_ptr->user_chunk_cache_max); + /* FALL THROUGH */ + case 0: /* no limit */ +# endif /* PNG_USER_LIMITS_SUPPORTED */ + /* Here when the limit isn't reached or when limits are compiled + * out; store the chunk. + */ + png_set_unknown_chunks(png_ptr, info_ptr, + &png_ptr->unknown_chunk, 1); + handled = 1; +# ifdef PNG_USER_LIMITS_SUPPORTED + break; + } +# endif + } +# else /* no store support! */ + PNG_UNUSED(info_ptr) +# error untested code (reading unknown chunks with no store support) +# endif + + /* Regardless of the error handling below the cached data (if any) can be + * freed now. Notice that the data is not freed if there is a png_error, but + * it will be freed by destroy_read_struct. + */ + if (png_ptr->unknown_chunk.data != NULL) + png_free(png_ptr, png_ptr->unknown_chunk.data); + png_ptr->unknown_chunk.data = NULL; + +#else /* !PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */ + /* There is no support to read an unknown chunk, so just skip it. */ + png_crc_finish(png_ptr, length); + PNG_UNUSED(info_ptr) + PNG_UNUSED(keep) +#endif /* !PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */ + + /* Check for unhandled critical chunks */ + if (!handled && PNG_CHUNK_CRITICAL(png_ptr->chunk_name)) + png_chunk_error(png_ptr, "unhandled critical chunk"); } /* This function is called to verify that a chunk name is valid. - This function can't have the "critical chunk check" incorporated - into it, since in the future we will need to be able to call user - functions to handle unknown critical chunks after we check that - the chunk name itself is valid. */ + * This function can't have the "critical chunk check" incorporated + * into it, since in the future we will need to be able to call user + * functions to handle unknown critical chunks after we check that + * the chunk name itself is valid. + */ -#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97)) +/* Bit hacking: the test for an invalid byte in the 4 byte chunk name is: + * + * ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97)) + */ void /* PRIVATE */ -png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name) +png_check_chunk_name(png_structrp png_ptr, png_uint_32 chunk_name) { + int i; + png_debug(1, "in png_check_chunk_name"); - if (isnonalpha(chunk_name[0]) || isnonalpha(chunk_name[1]) || - isnonalpha(chunk_name[2]) || isnonalpha(chunk_name[3])) + + for (i=1; i<=4; ++i) { - png_chunk_error(png_ptr, "invalid chunk type"); + int c = chunk_name & 0xff; + + if (c < 65 || c > 122 || (c > 90 && c < 97)) + png_chunk_error(png_ptr, "invalid chunk type"); + + chunk_name >>= 8; } } -/* Combines the row recently read in with the existing pixels in the - row. This routine takes care of alpha and transparency if requested. - This routine also handles the two methods of progressive display - of interlaced images, depending on the mask value. - The mask value describes which pixels are to be combined with - the row. The pattern always repeats every 8 pixels, so just 8 - bits are needed. A one indicates the pixel is to be combined, - a zero indicates the pixel is to be skipped. This is in addition - to any alpha or transparency value associated with the pixel. If - you want all pixels to be combined, pass 0xff (255) in mask. */ - +/* Combines the row recently read in with the existing pixels in the row. This + * routine takes care of alpha and transparency if requested. This routine also + * handles the two methods of progressive display of interlaced images, + * depending on the 'display' value; if 'display' is true then the whole row + * (dp) is filled from the start by replicating the available pixels. If + * 'display' is false only those pixels present in the pass are filled in. + */ void /* PRIVATE */ -png_combine_row(png_structp png_ptr, png_bytep row, int mask) +png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display) { + unsigned int pixel_depth = png_ptr->transformed_pixel_depth; + png_const_bytep sp = png_ptr->row_buf + 1; + png_uint_32 row_width = png_ptr->width; + unsigned int pass = png_ptr->pass; + png_bytep end_ptr = 0; + png_byte end_byte = 0; + unsigned int end_mask; + png_debug(1, "in png_combine_row"); - if (mask == 0xff) + + /* Added in 1.5.6: it should not be possible to enter this routine until at + * least one row has been read from the PNG data and transformed. + */ + if (pixel_depth == 0) + png_error(png_ptr, "internal row logic error"); + + /* Added in 1.5.4: the pixel depth should match the information returned by + * any call to png_read_update_info at this point. Do not continue if we got + * this wrong. + */ + if (png_ptr->info_rowbytes != 0 && png_ptr->info_rowbytes != + PNG_ROWBYTES(pixel_depth, row_width)) + png_error(png_ptr, "internal row size calculation error"); + + /* Don't expect this to ever happen: */ + if (row_width == 0) + png_error(png_ptr, "internal row width error"); + + /* Preserve the last byte in cases where only part of it will be overwritten, + * the multiply below may overflow, we don't care because ANSI-C guarantees + * we get the low bits. + */ + end_mask = (pixel_depth * row_width) & 7; + if (end_mask != 0) { - png_memcpy(row, png_ptr->row_buf + 1, - PNG_ROWBYTES(png_ptr->row_info.pixel_depth, png_ptr->width)); + /* end_ptr == NULL is a flag to say do nothing */ + end_ptr = dp + PNG_ROWBYTES(pixel_depth, row_width) - 1; + end_byte = *end_ptr; +# ifdef PNG_READ_PACKSWAP_SUPPORTED + if (png_ptr->transformations & PNG_PACKSWAP) /* little-endian byte */ + end_mask = 0xff << end_mask; + + else /* big-endian byte */ +# endif + end_mask = 0xff >> end_mask; + /* end_mask is now the bits to *keep* from the destination row */ } - else + + /* For non-interlaced images this reduces to a memcpy(). A memcpy() + * will also happen if interlacing isn't supported or if the application + * does not call png_set_interlace_handling(). In the latter cases the + * caller just gets a sequence of the unexpanded rows from each interlace + * pass. + */ +#ifdef PNG_READ_INTERLACING_SUPPORTED + if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE) && + pass < 6 && (display == 0 || + /* The following copies everything for 'display' on passes 0, 2 and 4. */ + (display == 1 && (pass & 1) != 0))) { - switch (png_ptr->row_info.pixel_depth) + /* Narrow images may have no bits in a pass; the caller should handle + * this, but this test is cheap: + */ + if (row_width <= PNG_PASS_START_COL(pass)) + return; + + if (pixel_depth < 8) { - case 1: - { - png_bytep sp = png_ptr->row_buf + 1; - png_bytep dp = row; - int s_inc, s_start, s_end; - int m = 0x80; - int shift; - png_uint_32 i; - png_uint_32 row_width = png_ptr->width; + /* For pixel depths up to 4 bpp the 8-pixel mask can be expanded to fit + * into 32 bits, then a single loop over the bytes using the four byte + * values in the 32-bit mask can be used. For the 'display' option the + * expanded mask may also not require any masking within a byte. To + * make this work the PACKSWAP option must be taken into account - it + * simply requires the pixels to be reversed in each byte. + * + * The 'regular' case requires a mask for each of the first 6 passes, + * the 'display' case does a copy for the even passes in the range + * 0..6. This has already been handled in the test above. + * + * The masks are arranged as four bytes with the first byte to use in + * the lowest bits (little-endian) regardless of the order (PACKSWAP or + * not) of the pixels in each byte. + * + * NOTE: the whole of this logic depends on the caller of this function + * only calling it on rows appropriate to the pass. This function only + * understands the 'x' logic; the 'y' logic is handled by the caller. + * + * The following defines allow generation of compile time constant bit + * masks for each pixel depth and each possibility of swapped or not + * swapped bytes. Pass 'p' is in the range 0..6; 'x', a pixel index, + * is in the range 0..7; and the result is 1 if the pixel is to be + * copied in the pass, 0 if not. 'S' is for the sparkle method, 'B' + * for the block method. + * + * With some compilers a compile time expression of the general form: + * + * (shift >= 32) ? (a >> (shift-32)) : (b >> shift) + * + * Produces warnings with values of 'shift' in the range 33 to 63 + * because the right hand side of the ?: expression is evaluated by + * the compiler even though it isn't used. Microsoft Visual C (various + * versions) and the Intel C compiler are known to do this. To avoid + * this the following macros are used in 1.5.6. This is a temporary + * solution to avoid destabilizing the code during the release process. + */ +# if PNG_USE_COMPILE_TIME_MASKS +# define PNG_LSR(x,s) ((x)>>((s) & 0x1f)) +# define PNG_LSL(x,s) ((x)<<((s) & 0x1f)) +# else +# define PNG_LSR(x,s) ((x)>>(s)) +# define PNG_LSL(x,s) ((x)<<(s)) +# endif +# define S_COPY(p,x) (((p)<4 ? PNG_LSR(0x80088822,(3-(p))*8+(7-(x))) :\ + PNG_LSR(0xaa55ff00,(7-(p))*8+(7-(x)))) & 1) +# define B_COPY(p,x) (((p)<4 ? PNG_LSR(0xff0fff33,(3-(p))*8+(7-(x))) :\ + PNG_LSR(0xff55ff00,(7-(p))*8+(7-(x)))) & 1) -#ifdef PNG_READ_PACKSWAP_SUPPORTED + /* Return a mask for pass 'p' pixel 'x' at depth 'd'. The mask is + * little endian - the first pixel is at bit 0 - however the extra + * parameter 's' can be set to cause the mask position to be swapped + * within each byte, to match the PNG format. This is done by XOR of + * the shift with 7, 6 or 4 for bit depths 1, 2 and 4. + */ +# define PIXEL_MASK(p,x,d,s) \ + (PNG_LSL(((PNG_LSL(1U,(d)))-1),(((x)*(d))^((s)?8-(d):0)))) + + /* Hence generate the appropriate 'block' or 'sparkle' pixel copy mask. + */ +# define S_MASKx(p,x,d,s) (S_COPY(p,x)?PIXEL_MASK(p,x,d,s):0) +# define B_MASKx(p,x,d,s) (B_COPY(p,x)?PIXEL_MASK(p,x,d,s):0) + + /* Combine 8 of these to get the full mask. For the 1-bpp and 2-bpp + * cases the result needs replicating, for the 4-bpp case the above + * generates a full 32 bits. + */ +# define MASK_EXPAND(m,d) ((m)*((d)==1?0x01010101:((d)==2?0x00010001:1))) + +# define S_MASK(p,d,s) MASK_EXPAND(S_MASKx(p,0,d,s) + S_MASKx(p,1,d,s) +\ + S_MASKx(p,2,d,s) + S_MASKx(p,3,d,s) + S_MASKx(p,4,d,s) +\ + S_MASKx(p,5,d,s) + S_MASKx(p,6,d,s) + S_MASKx(p,7,d,s), d) + +# define B_MASK(p,d,s) MASK_EXPAND(B_MASKx(p,0,d,s) + B_MASKx(p,1,d,s) +\ + B_MASKx(p,2,d,s) + B_MASKx(p,3,d,s) + B_MASKx(p,4,d,s) +\ + B_MASKx(p,5,d,s) + B_MASKx(p,6,d,s) + B_MASKx(p,7,d,s), d) + +#if PNG_USE_COMPILE_TIME_MASKS + /* Utility macros to construct all the masks for a depth/swap + * combination. The 's' parameter says whether the format is PNG + * (big endian bytes) or not. Only the three odd-numbered passes are + * required for the display/block algorithm. + */ +# define S_MASKS(d,s) { S_MASK(0,d,s), S_MASK(1,d,s), S_MASK(2,d,s),\ + S_MASK(3,d,s), S_MASK(4,d,s), S_MASK(5,d,s) } + +# define B_MASKS(d,s) { B_MASK(1,d,s), S_MASK(3,d,s), S_MASK(5,d,s) } + +# define DEPTH_INDEX(d) ((d)==1?0:((d)==2?1:2)) + + /* Hence the pre-compiled masks indexed by PACKSWAP (or not), depth and + * then pass: + */ + static PNG_CONST png_uint_32 row_mask[2/*PACKSWAP*/][3/*depth*/][6] = + { + /* Little-endian byte masks for PACKSWAP */ + { S_MASKS(1,0), S_MASKS(2,0), S_MASKS(4,0) }, + /* Normal (big-endian byte) masks - PNG format */ + { S_MASKS(1,1), S_MASKS(2,1), S_MASKS(4,1) } + }; + + /* display_mask has only three entries for the odd passes, so index by + * pass>>1. + */ + static PNG_CONST png_uint_32 display_mask[2][3][3] = + { + /* Little-endian byte masks for PACKSWAP */ + { B_MASKS(1,0), B_MASKS(2,0), B_MASKS(4,0) }, + /* Normal (big-endian byte) masks - PNG format */ + { B_MASKS(1,1), B_MASKS(2,1), B_MASKS(4,1) } + }; + +# define MASK(pass,depth,display,png)\ + ((display)?display_mask[png][DEPTH_INDEX(depth)][pass>>1]:\ + row_mask[png][DEPTH_INDEX(depth)][pass]) + +#else /* !PNG_USE_COMPILE_TIME_MASKS */ + /* This is the runtime alternative: it seems unlikely that this will + * ever be either smaller or faster than the compile time approach. + */ +# define MASK(pass,depth,display,png)\ + ((display)?B_MASK(pass,depth,png):S_MASK(pass,depth,png)) +#endif /* !PNG_USE_COMPILE_TIME_MASKS */ + + /* Use the appropriate mask to copy the required bits. In some cases + * the byte mask will be 0 or 0xff, optimize these cases. row_width is + * the number of pixels, but the code copies bytes, so it is necessary + * to special case the end. + */ + png_uint_32 pixels_per_byte = 8 / pixel_depth; + png_uint_32 mask; + +# ifdef PNG_READ_PACKSWAP_SUPPORTED if (png_ptr->transformations & PNG_PACKSWAP) - { - s_start = 0; - s_end = 7; - s_inc = 1; - } + mask = MASK(pass, pixel_depth, display, 0); + else -#endif - { - s_start = 7; - s_end = 0; - s_inc = -1; - } +# endif + mask = MASK(pass, pixel_depth, display, 1); - shift = s_start; - - for (i = 0; i < row_width; i++) - { - if (m & mask) - { - int value; - - value = (*sp >> shift) & 0x01; - *dp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff); - *dp |= (png_byte)(value << shift); - } - - if (shift == s_end) - { - shift = s_start; - sp++; - dp++; - } - else - shift += s_inc; - - if (m == 1) - m = 0x80; - else - m >>= 1; - } - break; - } - case 2: + for (;;) { - png_bytep sp = png_ptr->row_buf + 1; - png_bytep dp = row; - int s_start, s_end, s_inc; - int m = 0x80; - int shift; - png_uint_32 i; - png_uint_32 row_width = png_ptr->width; - int value; + png_uint_32 m; -#ifdef PNG_READ_PACKSWAP_SUPPORTED - if (png_ptr->transformations & PNG_PACKSWAP) + /* It doesn't matter in the following if png_uint_32 has more than + * 32 bits because the high bits always match those in m<<24; it is, + * however, essential to use OR here, not +, because of this. + */ + m = mask; + mask = (m >> 8) | (m << 24); /* rotate right to good compilers */ + m &= 0xff; + + if (m != 0) /* something to copy */ { - s_start = 0; - s_end = 6; - s_inc = 2; - } - else -#endif - { - s_start = 6; - s_end = 0; - s_inc = -2; - } - - shift = s_start; - - for (i = 0; i < row_width; i++) - { - if (m & mask) - { - value = (*sp >> shift) & 0x03; - *dp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); - *dp |= (png_byte)(value << shift); - } - - if (shift == s_end) - { - shift = s_start; - sp++; - dp++; - } + if (m != 0xff) + *dp = (png_byte)((*dp & ~m) | (*sp & m)); else - shift += s_inc; - if (m == 1) - m = 0x80; - else - m >>= 1; + *dp = *sp; } - break; - } - case 4: - { - png_bytep sp = png_ptr->row_buf + 1; - png_bytep dp = row; - int s_start, s_end, s_inc; - int m = 0x80; - int shift; - png_uint_32 i; - png_uint_32 row_width = png_ptr->width; - int value; -#ifdef PNG_READ_PACKSWAP_SUPPORTED - if (png_ptr->transformations & PNG_PACKSWAP) - { - s_start = 0; - s_end = 4; - s_inc = 4; - } - else -#endif - { - s_start = 4; - s_end = 0; - s_inc = -4; - } - shift = s_start; + /* NOTE: this may overwrite the last byte with garbage if the image + * is not an exact number of bytes wide; libpng has always done + * this. + */ + if (row_width <= pixels_per_byte) + break; /* May need to restore part of the last byte */ - for (i = 0; i < row_width; i++) - { - if (m & mask) - { - value = (*sp >> shift) & 0xf; - *dp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); - *dp |= (png_byte)(value << shift); - } - - if (shift == s_end) - { - shift = s_start; - sp++; - dp++; - } - else - shift += s_inc; - if (m == 1) - m = 0x80; - else - m >>= 1; - } - break; - } - default: - { - png_bytep sp = png_ptr->row_buf + 1; - png_bytep dp = row; - png_size_t pixel_bytes = (png_ptr->row_info.pixel_depth >> 3); - png_uint_32 i; - png_uint_32 row_width = png_ptr->width; - png_byte m = 0x80; - - - for (i = 0; i < row_width; i++) - { - if (m & mask) - { - png_memcpy(dp, sp, pixel_bytes); - } - - sp += pixel_bytes; - dp += pixel_bytes; - - if (m == 1) - m = 0x80; - else - m >>= 1; - } - break; + row_width -= pixels_per_byte; + ++dp; + ++sp; } } + + else /* pixel_depth >= 8 */ + { + unsigned int bytes_to_copy, bytes_to_jump; + + /* Validate the depth - it must be a multiple of 8 */ + if (pixel_depth & 7) + png_error(png_ptr, "invalid user transform pixel depth"); + + pixel_depth >>= 3; /* now in bytes */ + row_width *= pixel_depth; + + /* Regardless of pass number the Adam 7 interlace always results in a + * fixed number of pixels to copy then to skip. There may be a + * different number of pixels to skip at the start though. + */ + { + unsigned int offset = PNG_PASS_START_COL(pass) * pixel_depth; + + row_width -= offset; + dp += offset; + sp += offset; + } + + /* Work out the bytes to copy. */ + if (display) + { + /* When doing the 'block' algorithm the pixel in the pass gets + * replicated to adjacent pixels. This is why the even (0,2,4,6) + * passes are skipped above - the entire expanded row is copied. + */ + bytes_to_copy = (1<<((6-pass)>>1)) * pixel_depth; + + /* But don't allow this number to exceed the actual row width. */ + if (bytes_to_copy > row_width) + bytes_to_copy = row_width; + } + + else /* normal row; Adam7 only ever gives us one pixel to copy. */ + bytes_to_copy = pixel_depth; + + /* In Adam7 there is a constant offset between where the pixels go. */ + bytes_to_jump = PNG_PASS_COL_OFFSET(pass) * pixel_depth; + + /* And simply copy these bytes. Some optimization is possible here, + * depending on the value of 'bytes_to_copy'. Special case the low + * byte counts, which we know to be frequent. + * + * Notice that these cases all 'return' rather than 'break' - this + * avoids an unnecessary test on whether to restore the last byte + * below. + */ + switch (bytes_to_copy) + { + case 1: + for (;;) + { + *dp = *sp; + + if (row_width <= bytes_to_jump) + return; + + dp += bytes_to_jump; + sp += bytes_to_jump; + row_width -= bytes_to_jump; + } + + case 2: + /* There is a possibility of a partial copy at the end here; this + * slows the code down somewhat. + */ + do + { + dp[0] = sp[0], dp[1] = sp[1]; + + if (row_width <= bytes_to_jump) + return; + + sp += bytes_to_jump; + dp += bytes_to_jump; + row_width -= bytes_to_jump; + } + while (row_width > 1); + + /* And there can only be one byte left at this point: */ + *dp = *sp; + return; + + case 3: + /* This can only be the RGB case, so each copy is exactly one + * pixel and it is not necessary to check for a partial copy. + */ + for(;;) + { + dp[0] = sp[0], dp[1] = sp[1], dp[2] = sp[2]; + + if (row_width <= bytes_to_jump) + return; + + sp += bytes_to_jump; + dp += bytes_to_jump; + row_width -= bytes_to_jump; + } + + default: +#if PNG_ALIGN_TYPE != PNG_ALIGN_NONE + /* Check for double byte alignment and, if possible, use a + * 16-bit copy. Don't attempt this for narrow images - ones that + * are less than an interlace panel wide. Don't attempt it for + * wide bytes_to_copy either - use the memcpy there. + */ + if (bytes_to_copy < 16 /*else use memcpy*/ && + png_isaligned(dp, png_uint_16) && + png_isaligned(sp, png_uint_16) && + bytes_to_copy % (sizeof (png_uint_16)) == 0 && + bytes_to_jump % (sizeof (png_uint_16)) == 0) + { + /* Everything is aligned for png_uint_16 copies, but try for + * png_uint_32 first. + */ + if (png_isaligned(dp, png_uint_32) && + png_isaligned(sp, png_uint_32) && + bytes_to_copy % (sizeof (png_uint_32)) == 0 && + bytes_to_jump % (sizeof (png_uint_32)) == 0) + { + png_uint_32p dp32 = png_aligncast(png_uint_32p,dp); + png_const_uint_32p sp32 = png_aligncastconst( + png_const_uint_32p, sp); + size_t skip = (bytes_to_jump-bytes_to_copy) / + (sizeof (png_uint_32)); + + do + { + size_t c = bytes_to_copy; + do + { + *dp32++ = *sp32++; + c -= (sizeof (png_uint_32)); + } + while (c > 0); + + if (row_width <= bytes_to_jump) + return; + + dp32 += skip; + sp32 += skip; + row_width -= bytes_to_jump; + } + while (bytes_to_copy <= row_width); + + /* Get to here when the row_width truncates the final copy. + * There will be 1-3 bytes left to copy, so don't try the + * 16-bit loop below. + */ + dp = (png_bytep)dp32; + sp = (png_const_bytep)sp32; + do + *dp++ = *sp++; + while (--row_width > 0); + return; + } + + /* Else do it in 16-bit quantities, but only if the size is + * not too large. + */ + else + { + png_uint_16p dp16 = png_aligncast(png_uint_16p, dp); + png_const_uint_16p sp16 = png_aligncastconst( + png_const_uint_16p, sp); + size_t skip = (bytes_to_jump-bytes_to_copy) / + (sizeof (png_uint_16)); + + do + { + size_t c = bytes_to_copy; + do + { + *dp16++ = *sp16++; + c -= (sizeof (png_uint_16)); + } + while (c > 0); + + if (row_width <= bytes_to_jump) + return; + + dp16 += skip; + sp16 += skip; + row_width -= bytes_to_jump; + } + while (bytes_to_copy <= row_width); + + /* End of row - 1 byte left, bytes_to_copy > row_width: */ + dp = (png_bytep)dp16; + sp = (png_const_bytep)sp16; + do + *dp++ = *sp++; + while (--row_width > 0); + return; + } + } +#endif /* PNG_ALIGN_ code */ + + /* The true default - use a memcpy: */ + for (;;) + { + memcpy(dp, sp, bytes_to_copy); + + if (row_width <= bytes_to_jump) + return; + + sp += bytes_to_jump; + dp += bytes_to_jump; + row_width -= bytes_to_jump; + if (bytes_to_copy > row_width) + bytes_to_copy = row_width; + } + } + + /* NOT REACHED*/ + } /* pixel_depth >= 8 */ + + /* Here if pixel_depth < 8 to check 'end_ptr' below. */ } + else +#endif + + /* If here then the switch above wasn't used so just memcpy the whole row + * from the temporary row buffer (notice that this overwrites the end of the + * destination row if it is a partial byte.) + */ + memcpy(dp, sp, PNG_ROWBYTES(pixel_depth, row_width)); + + /* Restore the overwritten bits from the last byte if necessary. */ + if (end_ptr != NULL) + *end_ptr = (png_byte)((end_byte & end_mask) | (*end_ptr & ~end_mask)); } #ifdef PNG_READ_INTERLACING_SUPPORTED -/* OLD pre-1.0.9 interface: -void png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass, - png_uint_32 transformations) - */ void /* PRIVATE */ -png_do_read_interlace(png_structp png_ptr) +png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass, + png_uint_32 transformations /* Because these may affect the byte layout */) { - png_row_infop row_info = &(png_ptr->row_info); - png_bytep row = png_ptr->row_buf + 1; - int pass = png_ptr->pass; - png_uint_32 transformations = png_ptr->transformations; /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* Offset to next interlace block */ - PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + static PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; png_debug(1, "in png_do_read_interlace"); if (row != NULL && row_info != NULL) @@ -2785,6 +3511,7 @@ png_do_read_interlace(png_structp png_ptr) s_end = 0; s_inc = -1; } + else #endif { @@ -2800,26 +3527,32 @@ png_do_read_interlace(png_structp png_ptr) v = (png_byte)((*sp >> sshift) & 0x01); for (j = 0; j < jstop; j++) { - *dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff); - *dp |= (png_byte)(v << dshift); + unsigned int tmp = *dp & (0x7f7f >> (7 - dshift)); + tmp |= v << dshift; + *dp = (png_byte)(tmp & 0xff); + if (dshift == s_end) { dshift = s_start; dp--; } + else dshift += s_inc; } + if (sshift == s_end) { sshift = s_start; sp--; } + else sshift += s_inc; } break; } + case 2: { png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2); @@ -2838,6 +3571,7 @@ png_do_read_interlace(png_structp png_ptr) s_end = 0; s_inc = -2; } + else #endif { @@ -2856,26 +3590,32 @@ png_do_read_interlace(png_structp png_ptr) v = (png_byte)((*sp >> sshift) & 0x03); for (j = 0; j < jstop; j++) { - *dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff); - *dp |= (png_byte)(v << dshift); + unsigned int tmp = *dp & (0x3f3f >> (6 - dshift)); + tmp |= v << dshift; + *dp = (png_byte)(tmp & 0xff); + if (dshift == s_end) { dshift = s_start; dp--; } + else dshift += s_inc; } + if (sshift == s_end) { sshift = s_start; sp--; } + else sshift += s_inc; } break; } + case 4: { png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1); @@ -2894,6 +3634,7 @@ png_do_read_interlace(png_structp png_ptr) s_end = 0; s_inc = -4; } + else #endif { @@ -2906,36 +3647,44 @@ png_do_read_interlace(png_structp png_ptr) for (i = 0; i < row_info->width; i++) { - png_byte v = (png_byte)((*sp >> sshift) & 0xf); + png_byte v = (png_byte)((*sp >> sshift) & 0x0f); int j; for (j = 0; j < jstop; j++) { - *dp &= (png_byte)((0xf0f >> (4 - dshift)) & 0xff); - *dp |= (png_byte)(v << dshift); + unsigned int tmp = *dp & (0xf0f >> (4 - dshift)); + tmp |= v << dshift; + *dp = (png_byte)(tmp & 0xff); + if (dshift == s_end) { dshift = s_start; dp--; } + else dshift += s_inc; } + if (sshift == s_end) { sshift = s_start; sp--; } + else sshift += s_inc; } break; } + default: { png_size_t pixel_bytes = (row_info->pixel_depth >> 3); + png_bytep sp = row + (png_size_t)(row_info->width - 1) * pixel_bytes; + png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes; int jstop = png_pass_inc[pass]; @@ -2943,171 +3692,439 @@ png_do_read_interlace(png_structp png_ptr) for (i = 0; i < row_info->width; i++) { - png_byte v[8]; + png_byte v[8]; /* SAFE; pixel_depth does not exceed 64 */ int j; - png_memcpy(v, sp, pixel_bytes); + memcpy(v, sp, pixel_bytes); + for (j = 0; j < jstop; j++) { - png_memcpy(dp, v, pixel_bytes); + memcpy(dp, v, pixel_bytes); dp -= pixel_bytes; } + sp -= pixel_bytes; } break; } } + row_info->width = final_width; row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, final_width); } #ifndef PNG_READ_PACKSWAP_SUPPORTED - transformations = transformations; /* Silence compiler warning */ + PNG_UNUSED(transformations) /* Silence compiler warning */ #endif } #endif /* PNG_READ_INTERLACING_SUPPORTED */ -void /* PRIVATE */ -png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row, - png_bytep prev_row, int filter) +static void +png_read_filter_row_sub(png_row_infop row_info, png_bytep row, + png_const_bytep prev_row) { - png_debug(1, "in png_read_filter_row"); - png_debug2(2, "row = %lu, filter = %d", - (unsigned long)png_ptr->row_number, filter); - switch (filter) + png_size_t i; + png_size_t istop = row_info->rowbytes; + unsigned int bpp = (row_info->pixel_depth + 7) >> 3; + png_bytep rp = row + bpp; + + PNG_UNUSED(prev_row) + + for (i = bpp; i < istop; i++) { - case PNG_FILTER_VALUE_NONE: - break; - case PNG_FILTER_VALUE_SUB: - { - png_uint_32 i; - png_uint_32 istop = row_info->rowbytes; - png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3; - png_bytep rp = row + bpp; - png_bytep lp = row; + *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff); + rp++; + } +} - for (i = bpp; i < istop; i++) - { - *rp = (png_byte)(((int)(*rp) + (int)(*lp++)) & 0xff); - rp++; - } - break; - } - case PNG_FILTER_VALUE_UP: - { - png_uint_32 i; - png_uint_32 istop = row_info->rowbytes; - png_bytep rp = row; - png_bytep pp = prev_row; +static void +png_read_filter_row_up(png_row_infop row_info, png_bytep row, + png_const_bytep prev_row) +{ + png_size_t i; + png_size_t istop = row_info->rowbytes; + png_bytep rp = row; + png_const_bytep pp = prev_row; - for (i = 0; i < istop; i++) - { - *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff); - rp++; - } - break; - } - case PNG_FILTER_VALUE_AVG: - { - png_uint_32 i; - png_bytep rp = row; - png_bytep pp = prev_row; - png_bytep lp = row; - png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3; - png_uint_32 istop = row_info->rowbytes - bpp; + for (i = 0; i < istop; i++) + { + *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff); + rp++; + } +} - for (i = 0; i < bpp; i++) - { - *rp = (png_byte)(((int)(*rp) + - ((int)(*pp++) / 2 )) & 0xff); - rp++; - } +static void +png_read_filter_row_avg(png_row_infop row_info, png_bytep row, + png_const_bytep prev_row) +{ + png_size_t i; + png_bytep rp = row; + png_const_bytep pp = prev_row; + unsigned int bpp = (row_info->pixel_depth + 7) >> 3; + png_size_t istop = row_info->rowbytes - bpp; - for (i = 0; i < istop; i++) - { - *rp = (png_byte)(((int)(*rp) + - (int)(*pp++ + *lp++) / 2 ) & 0xff); - rp++; - } - break; - } - case PNG_FILTER_VALUE_PAETH: - { - png_uint_32 i; - png_bytep rp = row; - png_bytep pp = prev_row; - png_bytep lp = row; - png_bytep cp = prev_row; - png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3; - png_uint_32 istop=row_info->rowbytes - bpp; + for (i = 0; i < bpp; i++) + { + *rp = (png_byte)(((int)(*rp) + + ((int)(*pp++) / 2 )) & 0xff); - for (i = 0; i < bpp; i++) - { - *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff); - rp++; - } + rp++; + } - for (i = 0; i < istop; i++) /* Use leftover rp,pp */ - { - int a, b, c, pa, pb, pc, p; + for (i = 0; i < istop; i++) + { + *rp = (png_byte)(((int)(*rp) + + (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff); - a = *lp++; - b = *pp++; - c = *cp++; + rp++; + } +} - p = b - c; - pc = a - c; +static void +png_read_filter_row_paeth_1byte_pixel(png_row_infop row_info, png_bytep row, + png_const_bytep prev_row) +{ + png_bytep rp_end = row + row_info->rowbytes; + int a, c; -#ifdef PNG_USE_ABS - pa = abs(p); - pb = abs(pc); - pc = abs(p + pc); -#else - pa = p < 0 ? -p : p; - pb = pc < 0 ? -pc : pc; - pc = (p + pc) < 0 ? -(p + pc) : p + pc; + /* First pixel/byte */ + c = *prev_row++; + a = *row + c; + *row++ = (png_byte)a; + + /* Remainder */ + while (row < rp_end) + { + int b, pa, pb, pc, p; + + a &= 0xff; /* From previous iteration or start */ + b = *prev_row++; + + p = b - c; + pc = a - c; + +# ifdef PNG_USE_ABS + pa = abs(p); + pb = abs(pc); + pc = abs(p + pc); +# else + pa = p < 0 ? -p : p; + pb = pc < 0 ? -pc : pc; + pc = (p + pc) < 0 ? -(p + pc) : p + pc; +# endif + + /* Find the best predictor, the least of pa, pb, pc favoring the earlier + * ones in the case of a tie. + */ + if (pb < pa) pa = pb, a = b; + if (pc < pa) a = c; + + /* Calculate the current pixel in a, and move the previous row pixel to c + * for the next time round the loop + */ + c = b; + a += *row; + *row++ = (png_byte)a; + } +} + +static void +png_read_filter_row_paeth_multibyte_pixel(png_row_infop row_info, png_bytep row, + png_const_bytep prev_row) +{ + int bpp = (row_info->pixel_depth + 7) >> 3; + png_bytep rp_end = row + bpp; + + /* Process the first pixel in the row completely (this is the same as 'up' + * because there is only one candidate predictor for the first row). + */ + while (row < rp_end) + { + int a = *row + *prev_row++; + *row++ = (png_byte)a; + } + + /* Remainder */ + rp_end += row_info->rowbytes - bpp; + + while (row < rp_end) + { + int a, b, c, pa, pb, pc, p; + + c = *(prev_row - bpp); + a = *(row - bpp); + b = *prev_row++; + + p = b - c; + pc = a - c; + +# ifdef PNG_USE_ABS + pa = abs(p); + pb = abs(pc); + pc = abs(p + pc); +# else + pa = p < 0 ? -p : p; + pb = pc < 0 ? -pc : pc; + pc = (p + pc) < 0 ? -(p + pc) : p + pc; +# endif + + if (pb < pa) pa = pb, a = b; + if (pc < pa) a = c; + + c = b; + a += *row; + *row++ = (png_byte)a; + } +} + +static void +png_init_filter_functions(png_structrp pp) + /* This function is called once for every PNG image (except for PNG images + * that only use PNG_FILTER_VALUE_NONE for all rows) to set the + * implementations required to reverse the filtering of PNG rows. Reversing + * the filter is the first transformation performed on the row data. It is + * performed in place, therefore an implementation can be selected based on + * the image pixel format. If the implementation depends on image width then + * take care to ensure that it works correctly if the image is interlaced - + * interlacing causes the actual row width to vary. + */ +{ + unsigned int bpp = (pp->pixel_depth + 7) >> 3; + + pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub; + pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up; + pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg; + if (bpp == 1) + pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = + png_read_filter_row_paeth_1byte_pixel; + else + pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = + png_read_filter_row_paeth_multibyte_pixel; + +#ifdef PNG_FILTER_OPTIMIZATIONS + /* To use this define PNG_FILTER_OPTIMIZATIONS as the name of a function to + * call to install hardware optimizations for the above functions; simply + * replace whatever elements of the pp->read_filter[] array with a hardware + * specific (or, for that matter, generic) optimization. + * + * To see an example of this examine what configure.ac does when + * --enable-arm-neon is specified on the command line. + */ + PNG_FILTER_OPTIMIZATIONS(pp, bpp); #endif +} - /* - if (pa <= pb && pa <= pc) - p = a; - else if (pb <= pc) - p = b; - else - p = c; - */ +void /* PRIVATE */ +png_read_filter_row(png_structrp pp, png_row_infop row_info, png_bytep row, + png_const_bytep prev_row, int filter) +{ + /* OPTIMIZATION: DO NOT MODIFY THIS FUNCTION, instead #define + * PNG_FILTER_OPTIMIZATIONS to a function that overrides the generic + * implementations. See png_init_filter_functions above. + */ + if (filter > PNG_FILTER_VALUE_NONE && filter < PNG_FILTER_VALUE_LAST) + { + if (pp->read_filter[0] == NULL) + png_init_filter_functions(pp); - p = (pa <= pb && pa <= pc) ? a : (pb <= pc) ? b : c; - - *rp = (png_byte)(((int)(*rp) + p) & 0xff); - rp++; - } - break; - } - default: - png_warning(png_ptr, "Ignoring bad adaptive filter type"); - *row = 0; - break; + pp->read_filter[filter-1](row_info, row, prev_row); } } #ifdef PNG_SEQUENTIAL_READ_SUPPORTED void /* PRIVATE */ -png_read_finish_row(png_structp png_ptr) +png_read_IDAT_data(png_structrp png_ptr, png_bytep output, + png_alloc_size_t avail_out) +{ + /* Loop reading IDATs and decompressing the result into output[avail_out] */ + png_ptr->zstream.next_out = output; + png_ptr->zstream.avail_out = 0; /* safety: set below */ + + if (output == NULL) + avail_out = 0; + + do + { + int ret; + png_byte tmpbuf[PNG_INFLATE_BUF_SIZE]; + + if (png_ptr->zstream.avail_in == 0) + { + uInt avail_in; + png_bytep buffer; + + while (png_ptr->idat_size == 0) + { + png_crc_finish(png_ptr, 0); + + png_ptr->idat_size = png_read_chunk_header(png_ptr); + /* This is an error even in the 'check' case because the code just + * consumed a non-IDAT header. + */ + if (png_ptr->chunk_name != png_IDAT) + png_error(png_ptr, "Not enough image data"); + } + + avail_in = png_ptr->IDAT_read_size; + + if (avail_in > png_ptr->idat_size) + avail_in = (uInt)png_ptr->idat_size; + + /* A PNG with a gradually increasing IDAT size will defeat this attempt + * to minimize memory usage by causing lots of re-allocs, but + * realistically doing IDAT_read_size re-allocs is not likely to be a + * big problem. + */ + buffer = png_read_buffer(png_ptr, avail_in, 0/*error*/); + + png_crc_read(png_ptr, buffer, avail_in); + png_ptr->idat_size -= avail_in; + + png_ptr->zstream.next_in = buffer; + png_ptr->zstream.avail_in = avail_in; + } + + /* And set up the output side. */ + if (output != NULL) /* standard read */ + { + uInt out = ZLIB_IO_MAX; + + if (out > avail_out) + out = (uInt)avail_out; + + avail_out -= out; + png_ptr->zstream.avail_out = out; + } + + else /* after last row, checking for end */ + { + png_ptr->zstream.next_out = tmpbuf; + png_ptr->zstream.avail_out = (sizeof tmpbuf); + } + + /* Use NO_FLUSH; this gives zlib the maximum opportunity to optimize the + * process. If the LZ stream is truncated the sequential reader will + * terminally damage the stream, above, by reading the chunk header of the + * following chunk (it then exits with png_error). + * + * TODO: deal more elegantly with truncated IDAT lists. + */ + ret = inflate(&png_ptr->zstream, Z_NO_FLUSH); + + /* Take the unconsumed output back. */ + if (output != NULL) + avail_out += png_ptr->zstream.avail_out; + + else /* avail_out counts the extra bytes */ + avail_out += (sizeof tmpbuf) - png_ptr->zstream.avail_out; + + png_ptr->zstream.avail_out = 0; + + if (ret == Z_STREAM_END) + { + /* Do this for safety; we won't read any more into this row. */ + png_ptr->zstream.next_out = NULL; + + png_ptr->mode |= PNG_AFTER_IDAT; + png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED; + + if (png_ptr->zstream.avail_in > 0 || png_ptr->idat_size > 0) + png_chunk_benign_error(png_ptr, "Extra compressed data"); + break; + } + + if (ret != Z_OK) + { + png_zstream_error(png_ptr, ret); + + if (output != NULL) + png_chunk_error(png_ptr, png_ptr->zstream.msg); + + else /* checking */ + { + png_chunk_benign_error(png_ptr, png_ptr->zstream.msg); + return; + } + } + } while (avail_out > 0); + + if (avail_out > 0) + { + /* The stream ended before the image; this is the same as too few IDATs so + * should be handled the same way. + */ + if (output != NULL) + png_error(png_ptr, "Not enough image data"); + + else /* the deflate stream contained extra data */ + png_chunk_benign_error(png_ptr, "Too much image data"); + } +} + +void /* PRIVATE */ +png_read_finish_IDAT(png_structrp png_ptr) +{ + /* We don't need any more data and the stream should have ended, however the + * LZ end code may actually not have been processed. In this case we must + * read it otherwise stray unread IDAT data or, more likely, an IDAT chunk + * may still remain to be consumed. + */ + if (!(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED)) + { + /* The NULL causes png_read_IDAT_data to swallow any remaining bytes in + * the compressed stream, but the stream may be damaged too, so even after + * this call we may need to terminate the zstream ownership. + */ + png_read_IDAT_data(png_ptr, NULL, 0); + png_ptr->zstream.next_out = NULL; /* safety */ + + /* Now clear everything out for safety; the following may not have been + * done. + */ + if (!(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED)) + { + png_ptr->mode |= PNG_AFTER_IDAT; + png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED; + } + } + + /* If the zstream has not been released do it now *and* terminate the reading + * of the final IDAT chunk. + */ + if (png_ptr->zowner == png_IDAT) + { + /* Always do this; the pointers otherwise point into the read buffer. */ + png_ptr->zstream.next_in = NULL; + png_ptr->zstream.avail_in = 0; + + /* Now we no longer own the zstream. */ + png_ptr->zowner = 0; + + /* The slightly weird semantics of the sequential IDAT reading is that we + * are always in or at the end of an IDAT chunk, so we always need to do a + * crc_finish here. If idat_size is non-zero we also need to read the + * spurious bytes at the end of the chunk now. + */ + (void)png_crc_finish(png_ptr, png_ptr->idat_size); + } +} + +void /* PRIVATE */ +png_read_finish_row(png_structrp png_ptr) { #ifdef PNG_READ_INTERLACING_SUPPORTED /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* Start of interlace block */ - PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; /* Offset to next interlace block */ - PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; /* Start of interlace block in the y direction */ - PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; + static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; /* Offset to next interlace block in the y direction */ - PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; + static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; #endif /* PNG_READ_INTERLACING_SUPPORTED */ png_debug(1, "in png_read_finish_row"); @@ -3119,13 +4136,19 @@ png_read_finish_row(png_structp png_ptr) if (png_ptr->interlaced) { png_ptr->row_number = 0; - png_memset(png_ptr->prev_row, 0, - png_ptr->rowbytes + 1); + + /* TO DO: don't do this if prev_row isn't needed (requires + * read-ahead of the next row's filter byte. + */ + memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); + do { png_ptr->pass++; + if (png_ptr->pass >= 7) break; + png_ptr->iwidth = (png_ptr->width + png_pass_inc[png_ptr->pass] - 1 - png_pass_start[png_ptr->pass]) / @@ -3134,129 +4157,88 @@ png_read_finish_row(png_structp png_ptr) if (!(png_ptr->transformations & PNG_INTERLACE)) { png_ptr->num_rows = (png_ptr->height + - png_pass_yinc[png_ptr->pass] - 1 - - png_pass_ystart[png_ptr->pass]) / - png_pass_yinc[png_ptr->pass]; - if (!(png_ptr->num_rows)) - continue; + png_pass_yinc[png_ptr->pass] - 1 - + png_pass_ystart[png_ptr->pass]) / + png_pass_yinc[png_ptr->pass]; } + else /* if (png_ptr->transformations & PNG_INTERLACE) */ - break; - } while (png_ptr->iwidth == 0); + break; /* libpng deinterlacing sees every row */ + + } while (png_ptr->num_rows == 0 || png_ptr->iwidth == 0); if (png_ptr->pass < 7) return; } #endif /* PNG_READ_INTERLACING_SUPPORTED */ - if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) - { - PNG_IDAT; - char extra; - int ret; - - png_ptr->zstream.next_out = (Byte *)&extra; - png_ptr->zstream.avail_out = (uInt)1; - for (;;) - { - if (!(png_ptr->zstream.avail_in)) - { - while (!png_ptr->idat_size) - { - png_crc_finish(png_ptr, 0); - png_ptr->idat_size = png_read_chunk_header(png_ptr); - if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) - png_error(png_ptr, "Not enough image data"); - } - png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; - png_ptr->zstream.next_in = png_ptr->zbuf; - if (png_ptr->zbuf_size > png_ptr->idat_size) - png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; - png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zstream.avail_in); - png_ptr->idat_size -= png_ptr->zstream.avail_in; - } - ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); - if (ret == Z_STREAM_END) - { - if (!(png_ptr->zstream.avail_out) || png_ptr->zstream.avail_in || - png_ptr->idat_size) - png_warning(png_ptr, "Extra compressed data"); - png_ptr->mode |= PNG_AFTER_IDAT; - png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; - break; - } - if (ret != Z_OK) - png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : - "Decompression Error"); - - if (!(png_ptr->zstream.avail_out)) - { - png_warning(png_ptr, "Extra compressed data"); - png_ptr->mode |= PNG_AFTER_IDAT; - png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; - break; - } - - } - png_ptr->zstream.avail_out = 0; - } - - if (png_ptr->idat_size || png_ptr->zstream.avail_in) - png_warning(png_ptr, "Extra compression data"); - - inflateReset(&png_ptr->zstream); - - png_ptr->mode |= PNG_AFTER_IDAT; + /* Here after at the end of the last row of the last pass. */ + png_read_finish_IDAT(png_ptr); } #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ void /* PRIVATE */ -png_read_start_row(png_structp png_ptr) +png_read_start_row(png_structrp png_ptr) { #ifdef PNG_READ_INTERLACING_SUPPORTED /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* Start of interlace block */ - PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; /* Offset to next interlace block */ - PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; /* Start of interlace block in the y direction */ - PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; + static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; /* Offset to next interlace block in the y direction */ - PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; + static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; #endif int max_pixel_depth; png_size_t row_bytes; png_debug(1, "in png_read_start_row"); - png_ptr->zstream.avail_in = 0; + +#ifdef PNG_READ_TRANSFORMS_SUPPORTED png_init_read_transformations(png_ptr); +#endif #ifdef PNG_READ_INTERLACING_SUPPORTED if (png_ptr->interlaced) { if (!(png_ptr->transformations & PNG_INTERLACE)) png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 - - png_pass_ystart[0]) / png_pass_yinc[0]; + png_pass_ystart[0]) / png_pass_yinc[0]; + else png_ptr->num_rows = png_ptr->height; png_ptr->iwidth = (png_ptr->width + - png_pass_inc[png_ptr->pass] - 1 - - png_pass_start[png_ptr->pass]) / - png_pass_inc[png_ptr->pass]; + png_pass_inc[png_ptr->pass] - 1 - + png_pass_start[png_ptr->pass]) / + png_pass_inc[png_ptr->pass]; } + else #endif /* PNG_READ_INTERLACING_SUPPORTED */ { png_ptr->num_rows = png_ptr->height; png_ptr->iwidth = png_ptr->width; } + max_pixel_depth = png_ptr->pixel_depth; + /* WARNING: * png_read_transform_info (pngrtran.c) performs a simpliar set of + * calculations to calculate the final pixel depth, then + * png_do_read_transforms actually does the transforms. This means that the + * code which effectively calculates this value is actually repeated in three + * separate places. They must all match. Innocent changes to the order of + * transformations can and will break libpng in a way that causes memory + * overwrites. + * + * TODO: fix this. + */ #ifdef PNG_READ_PACK_SUPPORTED if ((png_ptr->transformations & PNG_PACK) && png_ptr->bit_depth < 8) max_pixel_depth = 8; @@ -3269,16 +4251,20 @@ png_read_start_row(png_structp png_ptr) { if (png_ptr->num_trans) max_pixel_depth = 32; + else max_pixel_depth = 24; } + else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) { if (max_pixel_depth < 8) max_pixel_depth = 8; + if (png_ptr->num_trans) max_pixel_depth *= 2; } + else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) { if (png_ptr->num_trans) @@ -3290,22 +4276,42 @@ png_read_start_row(png_structp png_ptr) } #endif +#ifdef PNG_READ_EXPAND_16_SUPPORTED + if (png_ptr->transformations & PNG_EXPAND_16) + { +# ifdef PNG_READ_EXPAND_SUPPORTED + /* In fact it is an error if it isn't supported, but checking is + * the safe way. + */ + if (png_ptr->transformations & PNG_EXPAND) + { + if (png_ptr->bit_depth < 16) + max_pixel_depth *= 2; + } + else +# endif + png_ptr->transformations &= ~PNG_EXPAND_16; + } +#endif + #ifdef PNG_READ_FILLER_SUPPORTED if (png_ptr->transformations & (PNG_FILLER)) { - if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) - max_pixel_depth = 32; - else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) + if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) { if (max_pixel_depth <= 8) max_pixel_depth = 16; + else max_pixel_depth = 32; } - else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) + + else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB || + png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { if (max_pixel_depth <= 32) max_pixel_depth = 32; + else max_pixel_depth = 64; } @@ -3317,29 +4323,34 @@ png_read_start_row(png_structp png_ptr) { if ( #ifdef PNG_READ_EXPAND_SUPPORTED - (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) || + (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) || #endif #ifdef PNG_READ_FILLER_SUPPORTED - (png_ptr->transformations & (PNG_FILLER)) || + (png_ptr->transformations & (PNG_FILLER)) || #endif - png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) + png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) { if (max_pixel_depth <= 16) max_pixel_depth = 32; + else max_pixel_depth = 64; } + else { if (max_pixel_depth <= 8) - { - if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + { + if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA) max_pixel_depth = 32; - else + + else max_pixel_depth = 24; - } + } + else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA) max_pixel_depth = 64; + else max_pixel_depth = 48; } @@ -3349,14 +4360,21 @@ png_read_start_row(png_structp png_ptr) #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) && \ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) if (png_ptr->transformations & PNG_USER_TRANSFORM) - { - int user_pixel_depth = png_ptr->user_transform_depth* + { + int user_pixel_depth = png_ptr->user_transform_depth * png_ptr->user_transform_channels; - if (user_pixel_depth > max_pixel_depth) - max_pixel_depth=user_pixel_depth; - } + + if (user_pixel_depth > max_pixel_depth) + max_pixel_depth = user_pixel_depth; + } #endif + /* This value is stored in png_struct and double checked in the row read + * code. + */ + png_ptr->maximum_pixel_depth = (png_byte)max_pixel_depth; + png_ptr->transformed_pixel_depth = 0; /* calculated on demand */ + /* Align the width on the next larger 8 pixels. Mainly used * for interlacing */ @@ -3365,7 +4383,8 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) * for safety's sake */ row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) + - 1 + ((max_pixel_depth + 7) >> 3); + 1 + ((max_pixel_depth + 7) >> 3); + #ifdef PNG_MAX_MALLOC_64K if (row_bytes > (png_uint_32)65536L) png_error(png_ptr, "This image requires a row greater than 64KB"); @@ -3374,53 +4393,82 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) if (row_bytes + 48 > png_ptr->old_big_row_buf_size) { png_free(png_ptr, png_ptr->big_row_buf); + png_free(png_ptr, png_ptr->big_prev_row); + if (png_ptr->interlaced) png_ptr->big_row_buf = (png_bytep)png_calloc(png_ptr, row_bytes + 48); + else - png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, - row_bytes + 48); - png_ptr->old_big_row_buf_size = row_bytes + 48; + png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes + 48); + + png_ptr->big_prev_row = (png_bytep)png_malloc(png_ptr, row_bytes + 48); #ifdef PNG_ALIGNED_MEMORY_SUPPORTED /* Use 16-byte aligned memory for row_buf with at least 16 bytes - * of padding before and after row_buf. + * of padding before and after row_buf; treat prev_row similarly. + * NOTE: the alignment is to the start of the pixels, one beyond the start + * of the buffer, because of the filter byte. Prior to libpng 1.5.6 this + * was incorrect; the filter byte was aligned, which had the exact + * opposite effect of that intended. */ - png_ptr->row_buf = png_ptr->big_row_buf + 32 - - (((png_alloc_size_t)&(png_ptr->big_row_buf[0]) + 15) % 16); - png_ptr->old_big_row_buf_size = row_bytes + 48; + { + png_bytep temp = png_ptr->big_row_buf + 32; + int extra = (int)((temp - (png_bytep)0) & 0x0f); + png_ptr->row_buf = temp - extra - 1/*filter byte*/; + + temp = png_ptr->big_prev_row + 32; + extra = (int)((temp - (png_bytep)0) & 0x0f); + png_ptr->prev_row = temp - extra - 1/*filter byte*/; + } + #else - /* Use 32 bytes of padding before and 16 bytes after row_buf. */ - png_ptr->row_buf = png_ptr->big_row_buf + 32; + /* Use 31 bytes of padding before and 17 bytes after row_buf. */ + png_ptr->row_buf = png_ptr->big_row_buf + 31; + png_ptr->prev_row = png_ptr->big_prev_row + 31; #endif png_ptr->old_big_row_buf_size = row_bytes + 48; } #ifdef PNG_MAX_MALLOC_64K - if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L) + if (png_ptr->rowbytes > 65535) png_error(png_ptr, "This image requires a row greater than 64KB"); + #endif - if ((png_uint_32)png_ptr->rowbytes > (png_uint_32)(PNG_SIZE_MAX - 1)) + if (png_ptr->rowbytes > (PNG_SIZE_MAX - 1)) png_error(png_ptr, "Row has too many bytes to allocate in memory"); - if (png_ptr->rowbytes + 1 > png_ptr->old_prev_row_size) - { - png_free(png_ptr, png_ptr->prev_row); - png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)( - png_ptr->rowbytes + 1)); - png_ptr->old_prev_row_size = png_ptr->rowbytes + 1; - } + memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); - png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); - - png_debug1(3, "width = %lu,", (unsigned long)png_ptr->width); - png_debug1(3, "height = %lu,", (unsigned long)png_ptr->height); - png_debug1(3, "iwidth = %lu,", (unsigned long)png_ptr->iwidth); - png_debug1(3, "num_rows = %lu,", (unsigned long)png_ptr->num_rows); + png_debug1(3, "width = %u,", png_ptr->width); + png_debug1(3, "height = %u,", png_ptr->height); + png_debug1(3, "iwidth = %u,", png_ptr->iwidth); + png_debug1(3, "num_rows = %u,", png_ptr->num_rows); png_debug1(3, "rowbytes = %lu,", (unsigned long)png_ptr->rowbytes); png_debug1(3, "irowbytes = %lu", (unsigned long)PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1); + /* The sequential reader needs a buffer for IDAT, but the progressive reader + * does not, so free the read buffer now regardless; the sequential reader + * reallocates it on demand. + */ + if (png_ptr->read_buffer) + { + png_bytep buffer = png_ptr->read_buffer; + + png_ptr->read_buffer_size = 0; + png_ptr->read_buffer = NULL; + png_free(png_ptr, buffer); + } + + /* Finally claim the zstream for the inflate of the IDAT data, use the bits + * value from the stream (note that this will result in a fatal error if the + * IDAT stream has a bogus deflate header window_bits value, but this should + * not be happening any longer!) + */ + if (png_inflate_claim(png_ptr, png_IDAT) != Z_OK) + png_error(png_ptr, png_ptr->zstream.msg); + png_ptr->flags |= PNG_FLAG_ROW_INIT; } #endif /* PNG_READ_SUPPORTED */ diff --git a/project/jni/png/pngset.c b/project/jni/png/pngset.c index d568c53f8..7e355d1f4 100644 --- a/project/jni/png/pngset.c +++ b/project/jni/png/pngset.c @@ -1,8 +1,8 @@ /* pngset.c - storage of image information into info struct * - * Last changed in libpng 1.4.6 [January 14, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.3 [July 18, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -16,170 +16,151 @@ * info struct and allows us to change the structure in the future. */ -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" -#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) #include "pngpriv.h" +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) + #ifdef PNG_bKGD_SUPPORTED void PNGAPI -png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background) +png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr, + png_const_color_16p background) { png_debug1(1, "in %s storage function", "bKGD"); - if (png_ptr == NULL || info_ptr == NULL) + if (png_ptr == NULL || info_ptr == NULL || background == NULL) return; - png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16)); + info_ptr->background = *background; info_ptr->valid |= PNG_INFO_bKGD; } #endif #ifdef PNG_cHRM_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED -void PNGAPI -png_set_cHRM(png_structp png_ptr, png_infop info_ptr, - double white_x, double white_y, double red_x, double red_y, - double green_x, double green_y, double blue_x, double blue_y) +void PNGFAPI +png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr, + png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, + png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, + png_fixed_point blue_x, png_fixed_point blue_y) { - png_debug1(1, "in %s storage function", "cHRM"); + png_xy xy; - if (png_ptr == NULL || info_ptr == NULL) - return; - - info_ptr->x_white = (float)white_x; - info_ptr->y_white = (float)white_y; - info_ptr->x_red = (float)red_x; - info_ptr->y_red = (float)red_y; - info_ptr->x_green = (float)green_x; - info_ptr->y_green = (float)green_y; - info_ptr->x_blue = (float)blue_x; - info_ptr->y_blue = (float)blue_y; -#ifdef PNG_FIXED_POINT_SUPPORTED - info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5); - info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5); - info_ptr->int_x_red = (png_fixed_point)( red_x*100000.+0.5); - info_ptr->int_y_red = (png_fixed_point)( red_y*100000.+0.5); - info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5); - info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5); - info_ptr->int_x_blue = (png_fixed_point)( blue_x*100000.+0.5); - info_ptr->int_y_blue = (png_fixed_point)( blue_y*100000.+0.5); -#endif - info_ptr->valid |= PNG_INFO_cHRM; -} -#endif /* PNG_FLOATING_POINT_SUPPORTED */ - -#ifdef PNG_FIXED_POINT_SUPPORTED -void PNGAPI -png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr, - png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, - png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, - png_fixed_point blue_x, png_fixed_point blue_y) -{ png_debug1(1, "in %s storage function", "cHRM fixed"); if (png_ptr == NULL || info_ptr == NULL) return; -#ifdef PNG_CHECK_cHRM_SUPPORTED - if (png_check_cHRM_fixed(png_ptr, - white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y)) -#endif - { - info_ptr->int_x_white = white_x; - info_ptr->int_y_white = white_y; - info_ptr->int_x_red = red_x; - info_ptr->int_y_red = red_y; - info_ptr->int_x_green = green_x; - info_ptr->int_y_green = green_y; - info_ptr->int_x_blue = blue_x; - info_ptr->int_y_blue = blue_y; -#ifdef PNG_FLOATING_POINT_SUPPORTED - info_ptr->x_white = (float)(white_x/100000.); - info_ptr->y_white = (float)(white_y/100000.); - info_ptr->x_red = (float)( red_x/100000.); - info_ptr->y_red = (float)( red_y/100000.); - info_ptr->x_green = (float)(green_x/100000.); - info_ptr->y_green = (float)(green_y/100000.); - info_ptr->x_blue = (float)( blue_x/100000.); - info_ptr->y_blue = (float)( blue_y/100000.); -#endif - info_ptr->valid |= PNG_INFO_cHRM; - } + xy.redx = red_x; + xy.redy = red_y; + xy.greenx = green_x; + xy.greeny = green_y; + xy.bluex = blue_x; + xy.bluey = blue_y; + xy.whitex = white_x; + xy.whitey = white_y; + + if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy, + 2/* override with app values*/)) + info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; + + png_colorspace_sync_info(png_ptr, info_ptr); } -#endif /* PNG_FIXED_POINT_SUPPORTED */ + +void PNGFAPI +png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr, + png_fixed_point int_red_X, png_fixed_point int_red_Y, + png_fixed_point int_red_Z, png_fixed_point int_green_X, + png_fixed_point int_green_Y, png_fixed_point int_green_Z, + png_fixed_point int_blue_X, png_fixed_point int_blue_Y, + png_fixed_point int_blue_Z) +{ + png_XYZ XYZ; + + png_debug1(1, "in %s storage function", "cHRM XYZ fixed"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + XYZ.red_X = int_red_X; + XYZ.red_Y = int_red_Y; + XYZ.red_Z = int_red_Z; + XYZ.green_X = int_green_X; + XYZ.green_Y = int_green_Y; + XYZ.green_Z = int_green_Z; + XYZ.blue_X = int_blue_X; + XYZ.blue_Y = int_blue_Y; + XYZ.blue_Z = int_blue_Z; + + if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace, &XYZ, 2)) + info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; + + png_colorspace_sync_info(png_ptr, info_ptr); +} + +# ifdef PNG_FLOATING_POINT_SUPPORTED +void PNGAPI +png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, + double white_x, double white_y, double red_x, double red_y, + double green_x, double green_y, double blue_x, double blue_y) +{ + png_set_cHRM_fixed(png_ptr, info_ptr, + png_fixed(png_ptr, white_x, "cHRM White X"), + png_fixed(png_ptr, white_y, "cHRM White Y"), + png_fixed(png_ptr, red_x, "cHRM Red X"), + png_fixed(png_ptr, red_y, "cHRM Red Y"), + png_fixed(png_ptr, green_x, "cHRM Green X"), + png_fixed(png_ptr, green_y, "cHRM Green Y"), + png_fixed(png_ptr, blue_x, "cHRM Blue X"), + png_fixed(png_ptr, blue_y, "cHRM Blue Y")); +} + +void PNGAPI +png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X, + double red_Y, double red_Z, double green_X, double green_Y, double green_Z, + double blue_X, double blue_Y, double blue_Z) +{ + png_set_cHRM_XYZ_fixed(png_ptr, info_ptr, + png_fixed(png_ptr, red_X, "cHRM Red X"), + png_fixed(png_ptr, red_Y, "cHRM Red Y"), + png_fixed(png_ptr, red_Z, "cHRM Red Z"), + png_fixed(png_ptr, green_X, "cHRM Red X"), + png_fixed(png_ptr, green_Y, "cHRM Red Y"), + png_fixed(png_ptr, green_Z, "cHRM Red Z"), + png_fixed(png_ptr, blue_X, "cHRM Red X"), + png_fixed(png_ptr, blue_Y, "cHRM Red Y"), + png_fixed(png_ptr, blue_Z, "cHRM Red Z")); +} +# endif /* PNG_FLOATING_POINT_SUPPORTED */ + #endif /* PNG_cHRM_SUPPORTED */ #ifdef PNG_gAMA_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED -void PNGAPI -png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma) +void PNGFAPI +png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr, + png_fixed_point file_gamma) { - double png_gamma; - png_debug1(1, "in %s storage function", "gAMA"); if (png_ptr == NULL || info_ptr == NULL) return; - /* Check for overflow */ - if (file_gamma > 21474.83) - { - png_warning(png_ptr, "Limiting gamma to 21474.83"); - png_gamma=21474.83; - } - else - png_gamma = file_gamma; - info_ptr->gamma = (float)png_gamma; -#ifdef PNG_FIXED_POINT_SUPPORTED - info_ptr->int_gamma = (int)(png_gamma*100000.+.5); -#endif - info_ptr->valid |= PNG_INFO_gAMA; - if (png_gamma == 0.0) - png_warning(png_ptr, "Setting gamma=0"); + png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma); + png_colorspace_sync_info(png_ptr, info_ptr); } -#endif + +# ifdef PNG_FLOATING_POINT_SUPPORTED void PNGAPI -png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point - int_gamma) +png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma) { - png_fixed_point png_gamma; - - png_debug1(1, "in %s storage function", "gAMA"); - - if (png_ptr == NULL || info_ptr == NULL) - return; - - if (int_gamma > (png_fixed_point)PNG_UINT_31_MAX) - { - png_warning(png_ptr, "Limiting gamma to 21474.83"); - png_gamma=PNG_UINT_31_MAX; - } - else - { - if (int_gamma < 0) - { - png_warning(png_ptr, "Setting negative gamma to zero"); - png_gamma = 0; - } - else - png_gamma = int_gamma; - } -#ifdef PNG_FLOATING_POINT_SUPPORTED - info_ptr->gamma = (float)(png_gamma/100000.); -#endif -#ifdef PNG_FIXED_POINT_SUPPORTED - info_ptr->int_gamma = png_gamma; -#endif - info_ptr->valid |= PNG_INFO_gAMA; - if (png_gamma == 0) - png_warning(png_ptr, "Setting gamma=0"); + png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma, + "png_set_gAMA")); } +# endif #endif #ifdef PNG_hIST_SUPPORTED void PNGAPI -png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist) +png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr, + png_const_uint_16p hist) { int i; @@ -192,36 +173,39 @@ png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist) > PNG_MAX_PALETTE_LENGTH) { png_warning(png_ptr, - "Invalid palette size, hIST allocation skipped"); + "Invalid palette size, hIST allocation skipped"); + return; } png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0); + /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in * version 1.2.1 */ - png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr, - PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16)); - if (png_ptr->hist == NULL) + info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr, + PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16)))); + + if (info_ptr->hist == NULL) { png_warning(png_ptr, "Insufficient memory for hIST chunk data"); return; } - for (i = 0; i < info_ptr->num_palette; i++) - png_ptr->hist[i] = hist[i]; - info_ptr->hist = png_ptr->hist; - info_ptr->valid |= PNG_INFO_hIST; - info_ptr->free_me |= PNG_FREE_HIST; + + for (i = 0; i < info_ptr->num_palette; i++) + info_ptr->hist[i] = hist[i]; + + info_ptr->valid |= PNG_INFO_hIST; } #endif void PNGAPI -png_set_IHDR(png_structp png_ptr, png_infop info_ptr, - png_uint_32 width, png_uint_32 height, int bit_depth, - int color_type, int interlace_type, int compression_type, - int filter_type) +png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr, + png_uint_32 width, png_uint_32 height, int bit_depth, + int color_type, int interlace_type, int compression_type, + int filter_type) { png_debug1(1, "in %s storage function", "IHDR"); @@ -242,30 +226,25 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr, if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) info_ptr->channels = 1; + else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR) info_ptr->channels = 3; + else info_ptr->channels = 1; + if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA) info_ptr->channels++; + info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth); - /* Check for potential overflow */ - if (width > (PNG_UINT_32_MAX - >> 3) /* 8-byte RGBA pixels */ - - 64 /* bigrowbuf hack */ - - 1 /* filter byte */ - - 7*8 /* rounding of width to multiple of 8 pixels */ - - 8) /* extra max_pixel_depth pad */ - info_ptr->rowbytes = 0; - else - info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width); + info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width); } #ifdef PNG_oFFs_SUPPORTED void PNGAPI -png_set_oFFs(png_structp png_ptr, png_infop info_ptr, - png_int_32 offset_x, png_int_32 offset_y, int unit_type) +png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr, + png_int_32 offset_x, png_int_32 offset_y, int unit_type) { png_debug1(1, "in %s storage function", "oFFs"); @@ -281,28 +260,48 @@ png_set_oFFs(png_structp png_ptr, png_infop info_ptr, #ifdef PNG_pCAL_SUPPORTED void PNGAPI -png_set_pCAL(png_structp png_ptr, png_infop info_ptr, - png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, - png_charp units, png_charpp params) +png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr, + png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, + int nparams, png_const_charp units, png_charpp params) { png_size_t length; int i; png_debug1(1, "in %s storage function", "pCAL"); - if (png_ptr == NULL || info_ptr == NULL) + if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL + || (nparams > 0 && params == NULL)) return; - length = png_strlen(purpose) + 1; + length = strlen(purpose) + 1; png_debug1(3, "allocating purpose for info (%lu bytes)", - (unsigned long)length); - info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length); + (unsigned long)length); + + /* TODO: validate format of calibration name and unit name */ + + /* Check that the type matches the specification. */ + if (type < 0 || type > 3) + png_error(png_ptr, "Invalid pCAL equation type"); + + if (nparams < 0 || nparams > 255) + png_error(png_ptr, "Invalid pCAL parameter count"); + + /* Validate params[nparams] */ + for (i=0; ipcal_purpose = png_voidcast(png_charp, + png_malloc_warn(png_ptr, length)); + if (info_ptr->pcal_purpose == NULL) { png_warning(png_ptr, "Insufficient memory for pCAL purpose"); return; } - png_memcpy(info_ptr->pcal_purpose, purpose, length); + + memcpy(info_ptr->pcal_purpose, purpose, length); png_debug(3, "storing X0, X1, type, and nparams in info"); info_ptr->pcal_X0 = X0; @@ -310,39 +309,47 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr, info_ptr->pcal_type = (png_byte)type; info_ptr->pcal_nparams = (png_byte)nparams; - length = png_strlen(units) + 1; + length = strlen(units) + 1; png_debug1(3, "allocating units for info (%lu bytes)", (unsigned long)length); - info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length); + + info_ptr->pcal_units = png_voidcast(png_charp, + png_malloc_warn(png_ptr, length)); + if (info_ptr->pcal_units == NULL) { png_warning(png_ptr, "Insufficient memory for pCAL units"); return; } - png_memcpy(info_ptr->pcal_units, units, length); - info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr, - (png_size_t)((nparams + 1) * png_sizeof(png_charp))); + memcpy(info_ptr->pcal_units, units, length); + + info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr, + (png_size_t)((nparams + 1) * (sizeof (png_charp))))); + if (info_ptr->pcal_params == NULL) { png_warning(png_ptr, "Insufficient memory for pCAL params"); return; } - png_memset(info_ptr->pcal_params, 0, (nparams + 1) * png_sizeof(png_charp)); + memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp))); for (i = 0; i < nparams; i++) { - length = png_strlen(params[i]) + 1; + length = strlen(params[i]) + 1; png_debug2(3, "allocating parameter %d for info (%lu bytes)", i, - (unsigned long)length); + (unsigned long)length); + info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length); + if (info_ptr->pcal_params[i] == NULL) { png_warning(png_ptr, "Insufficient memory for pCAL parameter"); return; } - png_memcpy(info_ptr->pcal_params[i], params[i], length); + + memcpy(info_ptr->pcal_params[i], params[i], length); } info_ptr->valid |= PNG_INFO_pCAL; @@ -350,74 +357,134 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr, } #endif -#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED) -#ifdef PNG_FLOATING_POINT_SUPPORTED +#ifdef PNG_sCAL_SUPPORTED void PNGAPI -png_set_sCAL(png_structp png_ptr, png_infop info_ptr, - int unit, double width, double height) +png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr, + int unit, png_const_charp swidth, png_const_charp sheight) { - png_debug1(1, "in %s storage function", "sCAL"); - - if (png_ptr == NULL || info_ptr == NULL) - return; - - info_ptr->scal_unit = (png_byte)unit; - info_ptr->scal_pixel_width = width; - info_ptr->scal_pixel_height = height; - - info_ptr->valid |= PNG_INFO_sCAL; -} -#else -#ifdef PNG_FIXED_POINT_SUPPORTED -void PNGAPI -png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr, - int unit, png_charp swidth, png_charp sheight) -{ - png_size_t length; + png_size_t lengthw = 0, lengthh = 0; png_debug1(1, "in %s storage function", "sCAL"); if (png_ptr == NULL || info_ptr == NULL) return; + /* Double check the unit (should never get here with an invalid + * unit unless this is an API call.) + */ + if (unit != 1 && unit != 2) + png_error(png_ptr, "Invalid sCAL unit"); + + if (swidth == NULL || (lengthw = strlen(swidth)) == 0 || + swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw)) + png_error(png_ptr, "Invalid sCAL width"); + + if (sheight == NULL || (lengthh = strlen(sheight)) == 0 || + sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh)) + png_error(png_ptr, "Invalid sCAL height"); + info_ptr->scal_unit = (png_byte)unit; - length = png_strlen(swidth) + 1; - png_debug1(3, "allocating unit for info (%u bytes)", - (unsigned int)length); - info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length); + ++lengthw; + + png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw); + + info_ptr->scal_s_width = png_voidcast(png_charp, + png_malloc_warn(png_ptr, lengthw)); + if (info_ptr->scal_s_width == NULL) { - png_warning(png_ptr, - "Memory allocation failed while processing sCAL"); + png_warning(png_ptr, "Memory allocation failed while processing sCAL"); return; } - png_memcpy(info_ptr->scal_s_width, swidth, length); - length = png_strlen(sheight) + 1; - png_debug1(3, "allocating unit for info (%u bytes)", - (unsigned int)length); - info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length); + memcpy(info_ptr->scal_s_width, swidth, lengthw); + + ++lengthh; + + png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh); + + info_ptr->scal_s_height = png_voidcast(png_charp, + png_malloc_warn(png_ptr, lengthh)); + if (info_ptr->scal_s_height == NULL) { png_free (png_ptr, info_ptr->scal_s_width); info_ptr->scal_s_width = NULL; - png_warning(png_ptr, - "Memory allocation failed while processing sCAL"); + + png_warning(png_ptr, "Memory allocation failed while processing sCAL"); return; } - png_memcpy(info_ptr->scal_s_height, sheight, length); + + memcpy(info_ptr->scal_s_height, sheight, lengthh); + info_ptr->valid |= PNG_INFO_sCAL; info_ptr->free_me |= PNG_FREE_SCAL; } -#endif -#endif + +# ifdef PNG_FLOATING_POINT_SUPPORTED +void PNGAPI +png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit, + double width, double height) +{ + png_debug1(1, "in %s storage function", "sCAL"); + + /* Check the arguments. */ + if (width <= 0) + png_warning(png_ptr, "Invalid sCAL width ignored"); + + else if (height <= 0) + png_warning(png_ptr, "Invalid sCAL height ignored"); + + else + { + /* Convert 'width' and 'height' to ASCII. */ + char swidth[PNG_sCAL_MAX_DIGITS+1]; + char sheight[PNG_sCAL_MAX_DIGITS+1]; + + png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width, + PNG_sCAL_PRECISION); + png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height, + PNG_sCAL_PRECISION); + + png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); + } +} +# endif + +# ifdef PNG_FIXED_POINT_SUPPORTED +void PNGAPI +png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit, + png_fixed_point width, png_fixed_point height) +{ + png_debug1(1, "in %s storage function", "sCAL"); + + /* Check the arguments. */ + if (width <= 0) + png_warning(png_ptr, "Invalid sCAL width ignored"); + + else if (height <= 0) + png_warning(png_ptr, "Invalid sCAL height ignored"); + + else + { + /* Convert 'width' and 'height' to ASCII. */ + char swidth[PNG_sCAL_MAX_DIGITS+1]; + char sheight[PNG_sCAL_MAX_DIGITS+1]; + + png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width); + png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height); + + png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); + } +} +# endif #endif #ifdef PNG_pHYs_SUPPORTED void PNGAPI -png_set_pHYs(png_structp png_ptr, png_infop info_ptr, - png_uint_32 res_x, png_uint_32 res_y, int unit_type) +png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr, + png_uint_32 res_x, png_uint_32 res_y, int unit_type) { png_debug1(1, "in %s storage function", "pHYs"); @@ -432,8 +499,8 @@ png_set_pHYs(png_structp png_ptr, png_infop info_ptr, #endif void PNGAPI -png_set_PLTE(png_structp png_ptr, png_infop info_ptr, - png_colorp palette, int num_palette) +png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr, + png_const_colorp palette, int num_palette) { png_debug1(1, "in %s storage function", "PLTE"); @@ -445,6 +512,7 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr, { if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) png_error(png_ptr, "Invalid palette length"); + else { png_warning(png_ptr, "Invalid palette length"); @@ -452,9 +520,23 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr, } } + if ((num_palette > 0 && palette == NULL) || + (num_palette == 0 +# ifdef PNG_MNG_FEATURES_SUPPORTED + && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0 +# endif + )) + { + png_chunk_report(png_ptr, "Invalid palette", PNG_CHUNK_ERROR); + return; + } + /* It may not actually be necessary to set png_ptr->palette here; * we do it for backward compatibility with the way the png_handle_tRNS * function used to do the allocation. + * + * 1.6.0: the above statement appears to be incorrect; something has to set + * the palette inside png_struct on read. */ png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0); @@ -462,9 +544,11 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr, * of num_palette entries, in case of an invalid PNG file that has * too-large sample values. */ - png_ptr->palette = (png_colorp)png_calloc(png_ptr, - PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color)); - png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof(png_color)); + png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr, + PNG_MAX_PALETTE_LENGTH * (sizeof (png_color)))); + + if (num_palette > 0) + memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color))); info_ptr->palette = png_ptr->palette; info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette; @@ -475,146 +559,120 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr, #ifdef PNG_sBIT_SUPPORTED void PNGAPI -png_set_sBIT(png_structp png_ptr, png_infop info_ptr, - png_color_8p sig_bit) +png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, + png_const_color_8p sig_bit) { png_debug1(1, "in %s storage function", "sBIT"); - if (png_ptr == NULL || info_ptr == NULL) + if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL) return; - png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof(png_color_8)); + info_ptr->sig_bit = *sig_bit; info_ptr->valid |= PNG_INFO_sBIT; } #endif #ifdef PNG_sRGB_SUPPORTED void PNGAPI -png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent) +png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent) { png_debug1(1, "in %s storage function", "sRGB"); if (png_ptr == NULL || info_ptr == NULL) return; - info_ptr->srgb_intent = (png_byte)intent; - info_ptr->valid |= PNG_INFO_sRGB; + (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent); + png_colorspace_sync_info(png_ptr, info_ptr); } void PNGAPI -png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr, - int intent) +png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, + int srgb_intent) { -#ifdef PNG_gAMA_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED - float file_gamma; -#endif -#ifdef PNG_FIXED_POINT_SUPPORTED - png_fixed_point int_file_gamma; -#endif -#endif -#ifdef PNG_cHRM_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED - float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y; -#endif - png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, - int_green_y, int_blue_x, int_blue_y; -#endif png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM"); if (png_ptr == NULL || info_ptr == NULL) return; - png_set_sRGB(png_ptr, info_ptr, intent); + if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent)) + { + /* This causes the gAMA and cHRM to be written too */ + info_ptr->colorspace.flags |= + PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; + } -#ifdef PNG_gAMA_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED - file_gamma = (float).45455; - png_set_gAMA(png_ptr, info_ptr, file_gamma); -#endif -#ifdef PNG_FIXED_POINT_SUPPORTED - int_file_gamma = 45455L; - png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma); -#endif -#endif - -#ifdef PNG_cHRM_SUPPORTED - int_white_x = 31270L; - int_white_y = 32900L; - int_red_x = 64000L; - int_red_y = 33000L; - int_green_x = 30000L; - int_green_y = 60000L; - int_blue_x = 15000L; - int_blue_y = 6000L; - -#ifdef PNG_FLOATING_POINT_SUPPORTED - white_x = (float).3127; - white_y = (float).3290; - red_x = (float).64; - red_y = (float).33; - green_x = (float).30; - green_y = (float).60; - blue_x = (float).15; - blue_y = (float).06; -#endif - -#ifdef PNG_FIXED_POINT_SUPPORTED - png_set_cHRM_fixed(png_ptr, info_ptr, - int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, - int_green_y, int_blue_x, int_blue_y); -#endif -#ifdef PNG_FLOATING_POINT_SUPPORTED - png_set_cHRM(png_ptr, info_ptr, - white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y); -#endif -#endif /* cHRM */ + png_colorspace_sync_info(png_ptr, info_ptr); } #endif /* sRGB */ #ifdef PNG_iCCP_SUPPORTED void PNGAPI -png_set_iCCP(png_structp png_ptr, png_infop info_ptr, - png_charp name, int compression_type, - png_charp profile, png_uint_32 proflen) +png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr, + png_const_charp name, int compression_type, + png_const_bytep profile, png_uint_32 proflen) { png_charp new_iccp_name; - png_charp new_iccp_profile; - png_uint_32 length; + png_bytep new_iccp_profile; + png_size_t length; png_debug1(1, "in %s storage function", "iCCP"); if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL) return; - length = png_strlen(name)+1; - new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length); + if (compression_type != PNG_COMPRESSION_TYPE_BASE) + png_app_error(png_ptr, "Invalid iCCP compression method"); + + /* Set the colorspace first because this validates the profile; do not + * override previously set app cHRM or gAMA here (because likely as not the + * application knows better than libpng what the correct values are.) Pass + * the info_ptr color_type field to png_colorspace_set_ICC because in the + * write case it has not yet been stored in png_ptr. + */ + { + int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name, + proflen, profile, info_ptr->color_type); + + png_colorspace_sync_info(png_ptr, info_ptr); + + /* Don't do any of the copying if the profile was bad, or inconsistent. */ + if (!result) + return; + + /* But do write the gAMA and cHRM chunks from the profile. */ + info_ptr->colorspace.flags |= + PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; + } + + length = strlen(name)+1; + new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length)); + if (new_iccp_name == NULL) { - png_warning(png_ptr, "Insufficient memory to process iCCP chunk"); + png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk"); return; } - png_memcpy(new_iccp_name, name, length); - new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen); + + memcpy(new_iccp_name, name, length); + new_iccp_profile = png_voidcast(png_bytep, + png_malloc_warn(png_ptr, proflen)); + if (new_iccp_profile == NULL) { - png_free (png_ptr, new_iccp_name); - png_warning(png_ptr, + png_free(png_ptr, new_iccp_name); + png_benign_error(png_ptr, "Insufficient memory to process iCCP profile"); return; } - png_memcpy(new_iccp_profile, profile, (png_size_t)proflen); + + memcpy(new_iccp_profile, profile, proflen); png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0); info_ptr->iccp_proflen = proflen; info_ptr->iccp_name = new_iccp_name; info_ptr->iccp_profile = new_iccp_profile; - /* Compression is always zero but is here so the API and info structure - * does not have to change if we introduce multiple compression types - */ - info_ptr->iccp_compression = (png_byte)compression_type; info_ptr->free_me |= PNG_FREE_ICCP; info_ptr->valid |= PNG_INFO_iCCP; } @@ -622,69 +680,81 @@ png_set_iCCP(png_structp png_ptr, png_infop info_ptr, #ifdef PNG_TEXT_SUPPORTED void PNGAPI -png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr, - int num_text) +png_set_text(png_const_structrp png_ptr, png_inforp info_ptr, + png_const_textp text_ptr, int num_text) { int ret; ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text); + if (ret) png_error(png_ptr, "Insufficient memory to store text"); } int /* PRIVATE */ -png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr, - int num_text) +png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr, + png_const_textp text_ptr, int num_text) { int i; - png_debug1(1, "in %s storage function", ((png_ptr == NULL || - png_ptr->chunk_name[0] == '\0') ? - "text" : (png_const_charp)png_ptr->chunk_name)); + png_debug1(1, "in %lx storage function", png_ptr == NULL ? "unexpected" : + (unsigned long)png_ptr->chunk_name); - if (png_ptr == NULL || info_ptr == NULL || num_text == 0) + if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL) return(0); /* Make sure we have enough space in the "text" array in info_struct - * to hold all of the incoming text_ptr objects. + * to hold all of the incoming text_ptr objects. This compare can't overflow + * because max_text >= num_text (anyway, subtract of two positive integers + * can't overflow in any case.) */ - if (info_ptr->num_text + num_text > info_ptr->max_text) + if (num_text > info_ptr->max_text - info_ptr->num_text) { - if (info_ptr->text != NULL) - { - png_textp old_text; - int old_max; + int old_num_text = info_ptr->num_text; + int max_text; + png_textp new_text = NULL; - old_max = info_ptr->max_text; - info_ptr->max_text = info_ptr->num_text + num_text + 8; - old_text = info_ptr->text; - info_ptr->text = (png_textp)png_malloc_warn(png_ptr, - (png_size_t)(info_ptr->max_text * png_sizeof(png_text))); - if (info_ptr->text == NULL) - { - png_free(png_ptr, old_text); - return(1); - } - png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max * - png_sizeof(png_text))); - png_free(png_ptr, old_text); - } - else + /* Calculate an appropriate max_text, checking for overflow. */ + max_text = old_num_text; + if (num_text <= INT_MAX - max_text) { - info_ptr->max_text = num_text + 8; - info_ptr->num_text = 0; - info_ptr->text = (png_textp)png_malloc_warn(png_ptr, - (png_size_t)(info_ptr->max_text * png_sizeof(png_text))); - if (info_ptr->text == NULL) - return(1); - info_ptr->free_me |= PNG_FREE_TEXT; + max_text += num_text; + + /* Round up to a multiple of 8 */ + if (max_text < INT_MAX-8) + max_text = (max_text + 8) & ~0x7; + + else + max_text = INT_MAX; + + /* Now allocate a new array and copy the old members in, this does all + * the overflow checks. + */ + new_text = png_voidcast(png_textp,png_realloc_array(png_ptr, + info_ptr->text, old_num_text, max_text-old_num_text, + sizeof *new_text)); } - png_debug1(3, "allocated %d entries for info_ptr->text", - info_ptr->max_text); + + if (new_text == NULL) + { + png_chunk_report(png_ptr, "too many text chunks", + PNG_CHUNK_WRITE_ERROR); + return 1; + } + + png_free(png_ptr, info_ptr->text); + + info_ptr->text = new_text; + info_ptr->free_me |= PNG_FREE_TEXT; + info_ptr->max_text = max_text; + /* num_text is adjusted below as the entries are copied in */ + + png_debug1(3, "allocated %d entries for info_ptr->text", max_text); } + for (i = 0; i < num_text; i++) { - png_size_t text_length, key_len; - png_size_t lang_len, lang_key_len; + size_t text_length, key_len; + size_t lang_len, lang_key_len; png_textp textp = &(info_ptr->text[info_ptr->num_text]); if (text_ptr[i].key == NULL) @@ -693,11 +763,12 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr, if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE || text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST) { - png_warning(png_ptr, "text compression mode is out of range"); + png_chunk_report(png_ptr, "text compression mode is out of range", + PNG_CHUNK_WRITE_ERROR); continue; } - key_len = png_strlen(text_ptr[i].key); + key_len = strlen(text_ptr[i].key); if (text_ptr[i].compression <= 0) { @@ -706,121 +777,140 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr, } else -#ifdef PNG_iTXt_SUPPORTED +# ifdef PNG_iTXt_SUPPORTED { /* Set iTXt data */ if (text_ptr[i].lang != NULL) - lang_len = png_strlen(text_ptr[i].lang); + lang_len = strlen(text_ptr[i].lang); + else lang_len = 0; + if (text_ptr[i].lang_key != NULL) - lang_key_len = png_strlen(text_ptr[i].lang_key); + lang_key_len = strlen(text_ptr[i].lang_key); + else lang_key_len = 0; } -#else /* PNG_iTXt_SUPPORTED */ +# else /* PNG_iTXt_SUPPORTED */ { - png_warning(png_ptr, "iTXt chunk not supported"); + png_chunk_report(png_ptr, "iTXt chunk not supported", + PNG_CHUNK_WRITE_ERROR); continue; } -#endif +# endif if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0') { text_length = 0; -#ifdef PNG_iTXt_SUPPORTED +# ifdef PNG_iTXt_SUPPORTED if (text_ptr[i].compression > 0) textp->compression = PNG_ITXT_COMPRESSION_NONE; + else -#endif +# endif textp->compression = PNG_TEXT_COMPRESSION_NONE; } else { - text_length = png_strlen(text_ptr[i].text); + text_length = strlen(text_ptr[i].text); textp->compression = text_ptr[i].compression; } - textp->key = (png_charp)png_malloc_warn(png_ptr, - (png_size_t) - (key_len + text_length + lang_len + lang_key_len + 4)); - if (textp->key == NULL) - return(1); - png_debug2(2, "Allocated %lu bytes at %x in png_set_text", - (unsigned long)(png_uint_32) - (key_len + lang_len + lang_key_len + text_length + 4), - (int)textp->key); + textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr, + key_len + text_length + lang_len + lang_key_len + 4)); - png_memcpy(textp->key, text_ptr[i].key,(png_size_t)(key_len)); + if (textp->key == NULL) + { + png_chunk_report(png_ptr, "text chunk: out of memory", + PNG_CHUNK_WRITE_ERROR); + return 1; + } + + png_debug2(2, "Allocated %lu bytes at %p in png_set_text", + (unsigned long)(png_uint_32) + (key_len + lang_len + lang_key_len + text_length + 4), + textp->key); + + memcpy(textp->key, text_ptr[i].key, key_len); *(textp->key + key_len) = '\0'; -#ifdef PNG_iTXt_SUPPORTED + if (text_ptr[i].compression > 0) { textp->lang = textp->key + key_len + 1; - png_memcpy(textp->lang, text_ptr[i].lang, lang_len); + memcpy(textp->lang, text_ptr[i].lang, lang_len); *(textp->lang + lang_len) = '\0'; textp->lang_key = textp->lang + lang_len + 1; - png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len); + memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len); *(textp->lang_key + lang_key_len) = '\0'; textp->text = textp->lang_key + lang_key_len + 1; } + else -#endif { -#ifdef PNG_iTXt_SUPPORTED textp->lang=NULL; textp->lang_key=NULL; -#endif textp->text = textp->key + key_len + 1; } + if (text_length) - png_memcpy(textp->text, text_ptr[i].text, - (png_size_t)(text_length)); + memcpy(textp->text, text_ptr[i].text, text_length); + *(textp->text + text_length) = '\0'; -#ifdef PNG_iTXt_SUPPORTED +# ifdef PNG_iTXt_SUPPORTED if (textp->compression > 0) { textp->text_length = 0; textp->itxt_length = text_length; } - else -#endif + else +# endif { textp->text_length = text_length; -#ifdef PNG_iTXt_SUPPORTED textp->itxt_length = 0; -#endif } + info_ptr->num_text++; png_debug1(3, "transferred text chunk %d", info_ptr->num_text); } + return(0); } #endif #ifdef PNG_tIME_SUPPORTED void PNGAPI -png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time) +png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr, + png_const_timep mod_time) { png_debug1(1, "in %s storage function", "tIME"); - if (png_ptr == NULL || info_ptr == NULL || + if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL || (png_ptr->mode & PNG_WROTE_tIME)) return; - png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof(png_time)); + if (mod_time->month == 0 || mod_time->month > 12 || + mod_time->day == 0 || mod_time->day > 31 || + mod_time->hour > 23 || mod_time->minute > 59 || + mod_time->second > 60) + { + png_warning(png_ptr, "Ignoring invalid time value"); + return; + } + + info_ptr->mod_time = *mod_time; info_ptr->valid |= PNG_INFO_tIME; } #endif #ifdef PNG_tRNS_SUPPORTED void PNGAPI -png_set_tRNS(png_structp png_ptr, png_infop info_ptr, - png_bytep trans_alpha, int num_trans, png_color_16p trans_color) +png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr, + png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color) { png_debug1(1, "in %s storage function", "tRNS"); @@ -832,35 +922,43 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr, /* It may not actually be necessary to set png_ptr->trans_alpha here; * we do it for backward compatibility with the way the png_handle_tRNS * function used to do the allocation. + * + * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively + * relies on png_set_tRNS storing the information in png_struct + * (otherwise it won't be there for the code in pngrtran.c). */ png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0); /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */ - png_ptr->trans_alpha = info_ptr->trans_alpha = (png_bytep)png_malloc(png_ptr, - (png_size_t)PNG_MAX_PALETTE_LENGTH); + png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep, + png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH)); + if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH) - png_memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans); + memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans); } if (trans_color != NULL) { int sample_max = (1 << info_ptr->bit_depth); + if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY && - (int)trans_color->gray > sample_max) || + trans_color->gray > sample_max) || (info_ptr->color_type == PNG_COLOR_TYPE_RGB && - ((int)trans_color->red > sample_max || - (int)trans_color->green > sample_max || - (int)trans_color->blue > sample_max))) + (trans_color->red > sample_max || + trans_color->green > sample_max || + trans_color->blue > sample_max))) png_warning(png_ptr, "tRNS chunk has out-of-range samples for bit_depth"); - png_memcpy(&(info_ptr->trans_color), trans_color, - png_sizeof(png_color_16)); + + info_ptr->trans_color = *trans_color; + if (num_trans == 0) num_trans = 1; } info_ptr->num_trans = (png_uint_16)num_trans; + if (num_trans != 0) { info_ptr->valid |= PNG_INFO_tRNS; @@ -871,207 +969,460 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr, #ifdef PNG_sPLT_SUPPORTED void PNGAPI -png_set_sPLT(png_structp png_ptr, - png_infop info_ptr, png_sPLT_tp entries, int nentries) +png_set_sPLT(png_const_structrp png_ptr, + png_inforp info_ptr, png_const_sPLT_tp entries, int nentries) /* * entries - array of png_sPLT_t structures * to be added to the list of palettes * in the info structure. + * * nentries - number of palette structures to be * added. */ { png_sPLT_tp np; - int i; - if (png_ptr == NULL || info_ptr == NULL) + if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL) return; - np = (png_sPLT_tp)png_malloc_warn(png_ptr, - (info_ptr->splt_palettes_num + nentries) * - (png_size_t)png_sizeof(png_sPLT_t)); + /* Use the internal realloc function, which checks for all the possible + * overflows. Notice that the parameters are (int) and (size_t) + */ + np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr, + info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries, + sizeof *np)); + if (np == NULL) { - png_warning(png_ptr, "No memory for sPLT palettes"); + /* Out of memory or too many chunks */ + png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR); return; } - png_memcpy(np, info_ptr->splt_palettes, - info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t)); png_free(png_ptr, info_ptr->splt_palettes); - info_ptr->splt_palettes=NULL; - - for (i = 0; i < nentries; i++) - { - png_sPLT_tp to = np + info_ptr->splt_palettes_num + i; - png_sPLT_tp from = entries + i; - png_uint_32 length; - - length = png_strlen(from->name) + 1; - to->name = (png_charp)png_malloc_warn(png_ptr, (png_size_t)length); - if (to->name == NULL) - { - png_warning(png_ptr, - "Out of memory while processing sPLT chunk"); - continue; - } - png_memcpy(to->name, from->name, length); - to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr, - (png_size_t)(from->nentries * png_sizeof(png_sPLT_entry))); - if (to->entries == NULL) - { - png_warning(png_ptr, - "Out of memory while processing sPLT chunk"); - png_free(png_ptr, to->name); - to->name = NULL; - continue; - } - png_memcpy(to->entries, from->entries, - from->nentries * png_sizeof(png_sPLT_entry)); - to->nentries = from->nentries; - to->depth = from->depth; - } - info_ptr->splt_palettes = np; - info_ptr->splt_palettes_num += nentries; - info_ptr->valid |= PNG_INFO_sPLT; info_ptr->free_me |= PNG_FREE_SPLT; + + np += info_ptr->splt_palettes_num; + + do + { + png_size_t length; + + /* Skip invalid input entries */ + if (entries->name == NULL || entries->entries == NULL) + { + /* png_handle_sPLT doesn't do this, so this is an app error */ + png_app_error(png_ptr, "png_set_sPLT: invalid sPLT"); + /* Just skip the invalid entry */ + continue; + } + + np->depth = entries->depth; + + /* In the even of out-of-memory just return - there's no point keeping on + * trying to add sPLT chunks. + */ + length = strlen(entries->name) + 1; + np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length)); + + if (np->name == NULL) + break; + + memcpy(np->name, entries->name, length); + + /* IMPORTANT: we have memory now that won't get freed if something else + * goes wrong, this code must free it. png_malloc_array produces no + * warnings, use a png_chunk_report (below) if there is an error. + */ + np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr, + entries->nentries, sizeof (png_sPLT_entry))); + + if (np->entries == NULL) + { + png_free(png_ptr, np->name); + break; + } + + np->nentries = entries->nentries; + /* This multiply can't overflow because png_malloc_array has already + * checked it when doing the allocation. + */ + memcpy(np->entries, entries->entries, + entries->nentries * sizeof (png_sPLT_entry)); + + /* Note that 'continue' skips the advance of the out pointer and out + * count, so an invalid entry is not added. + */ + info_ptr->valid |= PNG_INFO_sPLT; + ++(info_ptr->splt_palettes_num); + ++np; + } + while (++entries, --nentries); + + if (nentries > 0) + png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR); } #endif /* PNG_sPLT_SUPPORTED */ -#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED +#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED +static png_byte +check_location(png_const_structrp png_ptr, int location) +{ + location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT); + + /* New in 1.6.0; copy the location and check it. This is an API + * change, previously the app had to use the + * png_set_unknown_chunk_location API below for each chunk. + */ + if (location == 0 && !(png_ptr->mode & PNG_IS_READ_STRUCT)) + { + /* Write struct, so unknown chunks come from the app */ + png_app_warning(png_ptr, + "png_set_unknown_chunks now expects a valid location"); + /* Use the old behavior */ + location = (png_byte)(png_ptr->mode & + (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)); + } + + /* This need not be an internal error - if the app calls + * png_set_unknown_chunks on a read pointer it must get the location right. + */ + if (location == 0) + png_error(png_ptr, "invalid location in png_set_unknown_chunks"); + + /* Now reduce the location to the top-most set bit by removing each least + * significant bit in turn. + */ + while (location != (location & -location)) + location &= ~(location & -location); + + /* The cast is safe because 'location' is a bit mask and only the low four + * bits are significant. + */ + return (png_byte)location; +} + void PNGAPI -png_set_unknown_chunks(png_structp png_ptr, - png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns) +png_set_unknown_chunks(png_const_structrp png_ptr, + png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns) { png_unknown_chunkp np; - int i; - if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0) + if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 || + unknowns == NULL) return; - np = (png_unknown_chunkp)png_malloc_warn(png_ptr, - (png_size_t)((info_ptr->unknown_chunks_num + num_unknowns) * - png_sizeof(png_unknown_chunk))); + /* Check for the failure cases where support has been disabled at compile + * time. This code is hardly ever compiled - it's here because + * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this + * code) but may be meaningless if the read or write handling of unknown + * chunks is not compiled in. + */ +# if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \ + defined(PNG_READ_SUPPORTED) + if (png_ptr->mode & PNG_IS_READ_STRUCT) + { + png_app_error(png_ptr, "no unknown chunk support on read"); + return; + } +# endif +# if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \ + defined(PNG_WRITE_SUPPORTED) + if (!(png_ptr->mode & PNG_IS_READ_STRUCT)) + { + png_app_error(png_ptr, "no unknown chunk support on write"); + return; + } +# endif + + /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that + * unknown critical chunks could be lost with just a warning resulting in + * undefined behavior. Now png_chunk_report is used to provide behavior + * appropriate to read or write. + */ + np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr, + info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns, + sizeof *np)); + if (np == NULL) { - png_warning(png_ptr, - "Out of memory while processing unknown chunk"); + png_chunk_report(png_ptr, "too many unknown chunks", + PNG_CHUNK_WRITE_ERROR); return; } - png_memcpy(np, info_ptr->unknown_chunks, - info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk)); png_free(png_ptr, info_ptr->unknown_chunks); - info_ptr->unknown_chunks = NULL; + info_ptr->unknown_chunks = np; /* safe because it is initialized */ + info_ptr->free_me |= PNG_FREE_UNKN; - for (i = 0; i < num_unknowns; i++) + np += info_ptr->unknown_chunks_num; + + /* Increment unknown_chunks_num each time round the loop to protect the + * just-allocated chunk data. + */ + for (; num_unknowns > 0; --num_unknowns, ++unknowns) { - png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i; - png_unknown_chunkp from = unknowns + i; + memcpy(np->name, unknowns->name, (sizeof np->name)); + np->name[(sizeof np->name)-1] = '\0'; + np->location = check_location(png_ptr, unknowns->location); - png_memcpy((png_charp)to->name, (png_charp)from->name, - png_sizeof(from->name)); - to->name[png_sizeof(to->name)-1] = '\0'; - to->size = from->size; - /* Note our location in the read or write sequence */ - to->location = (png_byte)(png_ptr->mode & 0xff); + if (unknowns->size == 0) + { + np->data = NULL; + np->size = 0; + } - if (from->size == 0) - to->data=NULL; else { - to->data = (png_bytep)png_malloc_warn(png_ptr, - (png_size_t)from->size); - if (to->data == NULL) - { - png_warning(png_ptr, - "Out of memory while processing unknown chunk"); - to->size = 0; - } - else - png_memcpy(to->data, from->data, from->size); - } - } + np->data = png_voidcast(png_bytep, + png_malloc_base(png_ptr, unknowns->size)); - info_ptr->unknown_chunks = np; - info_ptr->unknown_chunks_num += num_unknowns; - info_ptr->free_me |= PNG_FREE_UNKN; + if (np->data == NULL) + { + png_chunk_report(png_ptr, "unknown chunk: out of memory", + PNG_CHUNK_WRITE_ERROR); + /* But just skip storing the unknown chunk */ + continue; + } + + memcpy(np->data, unknowns->data, unknowns->size); + np->size = unknowns->size; + } + + /* These increments are skipped on out-of-memory for the data - the + * unknown chunk entry gets overwritten if the png_chunk_report returns. + * This is correct in the read case (the chunk is just dropped.) + */ + ++np; + ++(info_ptr->unknown_chunks_num); + } } + void PNGAPI -png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr, - int chunk, int location) +png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr, + int chunk, int location) { - if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk < - (int)info_ptr->unknown_chunks_num) - info_ptr->unknown_chunks[chunk].location = (png_byte)location; + /* This API is pretty pointless in 1.6.0 because the location can be set + * before the call to png_set_unknown_chunks. + * + * TODO: add a png_app_warning in 1.7 + */ + if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && + chunk < info_ptr->unknown_chunks_num) + { + if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0) + { + png_app_error(png_ptr, "invalid unknown chunk location"); + /* Fake out the pre 1.6.0 behavior: */ + if ((location & PNG_HAVE_IDAT)) /* undocumented! */ + location = PNG_AFTER_IDAT; + + else + location = PNG_HAVE_IHDR; /* also undocumented */ + } + + info_ptr->unknown_chunks[chunk].location = + check_location(png_ptr, location); + } } #endif #ifdef PNG_MNG_FEATURES_SUPPORTED png_uint_32 PNGAPI -png_permit_mng_features(png_structp png_ptr, png_uint_32 mng_features) +png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features) { png_debug(1, "in png_permit_mng_features"); if (png_ptr == NULL) - return (png_uint_32)0; - png_ptr->mng_features_permitted = - (png_byte)(mng_features & PNG_ALL_MNG_FEATURES); - return (png_uint_32)png_ptr->mng_features_permitted; + return 0; + + png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES; + + return png_ptr->mng_features_permitted; } #endif #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED -void PNGAPI -png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep - chunk_list, int num_chunks) +static unsigned int +add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep) { - png_bytep new_list, p; - int i, old_num_chunks; + unsigned int i; + + /* Utility function: update the 'keep' state of a chunk if it is already in + * the list, otherwise add it to the list. + */ + for (i=0; iflags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS; - else - png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS; - if (keep == PNG_HANDLE_CHUNK_ALWAYS) - png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS; - else - png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS; - return; - } - if (chunk_list == NULL) - return; - old_num_chunks = png_ptr->num_chunk_list; - new_list=(png_bytep)png_malloc(png_ptr, - (png_size_t) - (5*(num_chunks + old_num_chunks))); - if (png_ptr->chunk_list != NULL) + if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST) { - png_memcpy(new_list, png_ptr->chunk_list, - (png_size_t)(5*old_num_chunks)); - png_free(png_ptr, png_ptr->chunk_list); - png_ptr->chunk_list=NULL; + png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep"); + return; + } + + if (num_chunks_in <= 0) + { + png_ptr->unknown_default = keep; + + /* '0' means just set the flags, so stop here */ + if (num_chunks_in == 0) + return; + } + + if (num_chunks_in < 0) + { + /* Ignore all unknown chunks and all chunks recognized by + * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND + */ + static PNG_CONST png_byte chunks_to_ignore[] = { + 98, 75, 71, 68, '\0', /* bKGD */ + 99, 72, 82, 77, '\0', /* cHRM */ + 103, 65, 77, 65, '\0', /* gAMA */ + 104, 73, 83, 84, '\0', /* hIST */ + 105, 67, 67, 80, '\0', /* iCCP */ + 105, 84, 88, 116, '\0', /* iTXt */ + 111, 70, 70, 115, '\0', /* oFFs */ + 112, 67, 65, 76, '\0', /* pCAL */ + 112, 72, 89, 115, '\0', /* pHYs */ + 115, 66, 73, 84, '\0', /* sBIT */ + 115, 67, 65, 76, '\0', /* sCAL */ + 115, 80, 76, 84, '\0', /* sPLT */ + 115, 84, 69, 82, '\0', /* sTER */ + 115, 82, 71, 66, '\0', /* sRGB */ + 116, 69, 88, 116, '\0', /* tEXt */ + 116, 73, 77, 69, '\0', /* tIME */ + 122, 84, 88, 116, '\0' /* zTXt */ + }; + + chunk_list = chunks_to_ignore; + num_chunks = (sizeof chunks_to_ignore)/5; + } + + else /* num_chunks_in > 0 */ + { + if (chunk_list == NULL) + { + /* Prior to 1.6.0 this was silently ignored, now it is an app_error + * which can be switched off. + */ + png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list"); + return; + } + + num_chunks = num_chunks_in; + } + + old_num_chunks = png_ptr->num_chunk_list; + if (png_ptr->chunk_list == NULL) + old_num_chunks = 0; + + /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow. + */ + if (num_chunks + old_num_chunks > UINT_MAX/5) + { + png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks"); + return; + } + + /* If these chunks are being reset to the default then no more memory is + * required because add_one_chunk above doesn't extend the list if the 'keep' + * parameter is the default. + */ + if (keep) + { + new_list = png_voidcast(png_bytep, png_malloc(png_ptr, + 5 * (num_chunks + old_num_chunks))); + + if (old_num_chunks > 0) + memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks); + } + + else if (old_num_chunks > 0) + new_list = png_ptr->chunk_list; + + else + new_list = NULL; + + /* Add the new chunks together with each one's handling code. If the chunk + * already exists the code is updated, otherwise the chunk is added to the + * end. (In libpng 1.6.0 order no longer matters because this code enforces + * the earlier convention that the last setting is the one that is used.) + */ + if (new_list != NULL) + { + png_const_bytep inlist; + png_bytep outlist; + unsigned int i; + + for (i=0; ichunk_list != new_list) + png_free(png_ptr, new_list); + + new_list = NULL; + } + } + + else + num_chunks = 0; + + png_ptr->num_chunk_list = num_chunks; + + if (png_ptr->chunk_list != new_list) + { + if (png_ptr->chunk_list != NULL) + png_free(png_ptr, png_ptr->chunk_list); + + png_ptr->chunk_list = new_list; } - png_memcpy(new_list + 5*old_num_chunks, chunk_list, - (png_size_t)(5*num_chunks)); - for (p = new_list + 5*old_num_chunks + 4, i = 0; inum_chunk_list = old_num_chunks + num_chunks; - png_ptr->chunk_list = new_list; - png_ptr->free_me |= PNG_FREE_LIST; } #endif #ifdef PNG_READ_USER_CHUNKS_SUPPORTED void PNGAPI -png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr, - png_user_chunk_ptr read_user_chunk_fn) +png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr, + png_user_chunk_ptr read_user_chunk_fn) { png_debug(1, "in png_set_read_user_chunk_fn"); @@ -1085,7 +1436,8 @@ png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr, #ifdef PNG_INFO_IMAGE_SUPPORTED void PNGAPI -png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers) +png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr, + png_bytepp row_pointers) { png_debug1(1, "in %s storage function", "rows"); @@ -1094,38 +1446,79 @@ png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers) if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers)) png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); + info_ptr->row_pointers = row_pointers; + if (row_pointers) info_ptr->valid |= PNG_INFO_IDAT; } #endif void PNGAPI -png_set_compression_buffer_size(png_structp png_ptr, - png_size_t size) +png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size) { if (png_ptr == NULL) return; - png_free(png_ptr, png_ptr->zbuf); - png_ptr->zbuf_size = size; - png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size); - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; + + if (size == 0 || size > PNG_UINT_31_MAX) + png_error(png_ptr, "invalid compression buffer size"); + +# ifdef PNG_SEQUENTIAL_READ_SUPPORTED + if (png_ptr->mode & PNG_IS_READ_STRUCT) + { + png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */ + return; + } +# endif + +# ifdef PNG_WRITE_SUPPORTED + if (!(png_ptr->mode & PNG_IS_READ_STRUCT)) + { + if (png_ptr->zowner != 0) + { + png_warning(png_ptr, + "Compression buffer size cannot be changed because it is in use"); + return; + } + + if (size > ZLIB_IO_MAX) + { + png_warning(png_ptr, + "Compression buffer size limited to system maximum"); + size = ZLIB_IO_MAX; /* must fit */ + } + + else if (size < 6) + { + /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH + * if this is permitted. + */ + png_warning(png_ptr, + "Compression buffer size cannot be reduced below 6"); + return; + } + + if (png_ptr->zbuffer_size != size) + { + png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list); + png_ptr->zbuffer_size = (uInt)size; + } + } +# endif } void PNGAPI -png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask) +png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask) { if (png_ptr && info_ptr) info_ptr->valid &= ~mask; } - #ifdef PNG_SET_USER_LIMITS_SUPPORTED /* This function was added to libpng 1.2.6 */ void PNGAPI -png_set_user_limits(png_structp png_ptr, png_uint_32 user_width_max, +png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max) { /* Images with dimensions larger than these limits will be @@ -1134,14 +1527,14 @@ png_set_user_limits(png_structp png_ptr, png_uint_32 user_width_max, */ if (png_ptr == NULL) return; + png_ptr->user_width_max = user_width_max; png_ptr->user_height_max = user_height_max; } /* This function was added to libpng 1.4.0 */ void PNGAPI -png_set_chunk_cache_max(png_structp png_ptr, - png_uint_32 user_chunk_cache_max) +png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max) { if (png_ptr) png_ptr->user_chunk_cache_max = user_chunk_cache_max; @@ -1149,26 +1542,56 @@ png_set_chunk_cache_max(png_structp png_ptr, /* This function was added to libpng 1.4.1 */ void PNGAPI -png_set_chunk_malloc_max(png_structp png_ptr, - png_alloc_size_t user_chunk_malloc_max) +png_set_chunk_malloc_max (png_structrp png_ptr, + png_alloc_size_t user_chunk_malloc_max) { - if (png_ptr) - png_ptr->user_chunk_malloc_max = - (png_size_t)user_chunk_malloc_max; + if (png_ptr) + png_ptr->user_chunk_malloc_max = user_chunk_malloc_max; } #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */ #ifdef PNG_BENIGN_ERRORS_SUPPORTED void PNGAPI -png_set_benign_errors(png_structp png_ptr, int allowed) +png_set_benign_errors(png_structrp png_ptr, int allowed) { png_debug(1, "in png_set_benign_errors"); + /* If allowed is 1, png_benign_error() is treated as a warning. + * + * If allowed is 0, png_benign_error() is treated as an error (which + * is the default behavior if png_set_benign_errors() is not called). + */ + if (allowed) - png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN; + png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN | + PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN; + else - png_ptr->flags &= ~PNG_FLAG_BENIGN_ERRORS_WARN; + png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN | + PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN); } #endif /* PNG_BENIGN_ERRORS_SUPPORTED */ + +#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED + /* Whether to report invalid palette index; added at libng-1.5.10. + * It is possible for an indexed (color-type==3) PNG file to contain + * pixels with invalid (out-of-range) indexes if the PLTE chunk has + * fewer entries than the image's bit-depth would allow. We recover + * from this gracefully by filling any incomplete palette with zeroes + * (opaque black). By default, when this occurs libpng will issue + * a benign error. This API can be used to override that behavior. + */ +void PNGAPI +png_set_check_for_invalid_index(png_structrp png_ptr, int allowed) +{ + png_debug(1, "in png_set_check_for_invalid_index"); + + if (allowed > 0) + png_ptr->num_palette_max = 0; + + else + png_ptr->num_palette_max = -1; +} +#endif #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ diff --git a/project/jni/png/pngtest.c b/project/jni/png/pngtest.c index 3ae78a6eb..299115523 100644 --- a/project/jni/png/pngtest.c +++ b/project/jni/png/pngtest.c @@ -1,8 +1,8 @@ /* pngtest.c - a simple test program to test libpng * - * Last changed in libpng 1.4.6 [January 14, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.2 [April 25, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -31,22 +31,61 @@ * of files at once by typing "pngtest -m file1.png file2.png ..." */ -#include "png.h" -#include "pngpriv.h" +#define _POSIX_SOURCE 1 -# include -# include -# define FCLOSE(file) fclose(file) +#include +#include +#include + +/* Defined so I can write to a file on gui/windowing platforms */ +/* #define STDERR stderr */ +#define STDERR stdout /* For DOS */ + +#include "png.h" + +/* Known chunks that exist in pngtest.png must be supported or pngtest will fail + * simply as a result of re-ordering them. This may be fixed in 1.7 + */ +#if defined PNG_READ_SUPPORTED && /* else nothing can be done */\ + defined PNG_READ_bKGD_SUPPORTED &&\ + defined PNG_READ_cHRM_SUPPORTED &&\ + defined PNG_READ_gAMA_SUPPORTED &&\ + defined PNG_READ_oFFs_SUPPORTED &&\ + defined PNG_READ_pCAL_SUPPORTED &&\ + defined PNG_READ_pHYs_SUPPORTED &&\ + defined PNG_READ_sBIT_SUPPORTED &&\ + defined PNG_READ_sCAL_SUPPORTED &&\ + defined PNG_READ_sRGB_SUPPORTED &&\ + defined PNG_READ_tEXt_SUPPORTED &&\ + defined PNG_READ_tIME_SUPPORTED &&\ + defined PNG_READ_zTXt_SUPPORTED + +#include "zlib.h" +/* Copied from pngpriv.h but only used in error messages below. */ +#ifndef PNG_ZBUF_SIZE +# define PNG_ZBUF_SIZE 8192 +#endif +#define FCLOSE(file) fclose(file) #ifndef PNG_STDIO_SUPPORTED - typedef FILE * png_FILE_p; +typedef FILE * png_FILE_p; #endif -/* Makes pngtest verbose so we can find problems (needs to be before png.h) */ +/* Makes pngtest verbose so we can find problems. */ #ifndef PNG_DEBUG # define PNG_DEBUG 0 #endif +#if PNG_DEBUG > 1 +# define pngtest_debug(m) ((void)fprintf(stderr, m "\n")) +# define pngtest_debug1(m,p1) ((void)fprintf(stderr, m "\n", p1)) +# define pngtest_debug2(m,p1,p2) ((void)fprintf(stderr, m "\n", p1, p2)) +#else +# define pngtest_debug(m) ((void)0) +# define pngtest_debug1(m,p1) ((void)0) +# define pngtest_debug2(m,p1,p2) ((void)0) +#endif + #if !PNG_DEBUG # define SINGLE_ROWBUF_ALLOC /* Makes buffer overruns easier to nail */ #endif @@ -71,63 +110,71 @@ static char tIME_string[PNG_tIME_STRING_LENGTH] = "tIME chunk is not present"; #endif static int verbose = 0; - -int test_one_file PNGARG((PNG_CONST char *inname, PNG_CONST char *outname)); +static int strict = 0; +static int relaxed = 0; +static int unsupported_chunks = 0; /* chunk unsupported by libpng in input */ +static int error_count = 0; /* count calls to png_error */ +static int warning_count = 0; /* count calls to png_warning */ #ifdef __TURBOC__ #include #endif -/* Defined so I can write to a file on gui/windowing platforms */ -/* #define STDERR stderr */ -#define STDERR stdout /* For DOS */ - -/* In case a system header (e.g., on AIX) defined jmpbuf */ -#ifdef jmpbuf -# undef jmpbuf -#endif - /* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */ #ifndef png_jmpbuf # define png_jmpbuf(png_ptr) png_ptr->jmpbuf #endif +/* Defines for unknown chunk handling if required. */ +#ifndef PNG_HANDLE_CHUNK_ALWAYS +# define PNG_HANDLE_CHUNK_ALWAYS 3 +#endif +#ifndef PNG_HANDLE_CHUNK_IF_SAFE +# define PNG_HANDLE_CHUNK_IF_SAFE 2 +#endif + +/* Utility to save typing/errors, the argument must be a name */ +#define MEMZERO(var) ((void)memset(&var, 0, sizeof var)) + /* Example of using row callbacks to make a simple progress meter */ static int status_pass = 1; static int status_dots_requested = 0; static int status_dots = 1; -void -read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass); -void +static void PNGCBAPI read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass) { if (png_ptr == NULL || row_number > PNG_UINT_31_MAX) return; + if (status_pass != pass) { fprintf(stdout, "\n Pass %d: ", pass); status_pass = pass; status_dots = 31; } + status_dots--; + if (status_dots == 0) { fprintf(stdout, "\n "); status_dots=30; } + fprintf(stdout, "r"); } -void -write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass); -void +#ifdef PNG_WRITE_SUPPORTED +static void PNGCBAPI write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass) { if (png_ptr == NULL || row_number > PNG_UINT_31_MAX || pass > 7) return; + fprintf(stdout, "w"); } +#endif #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED @@ -136,9 +183,7 @@ write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass) * 5 in case illegal filter values are present.) */ static png_uint_32 filters_used[256]; -void -count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data); -void +static void PNGCBAPI count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data) { if (png_ptr != NULL && row_info != NULL) @@ -153,13 +198,12 @@ count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data) static png_uint_32 zero_samples; -void -count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data); -void +static void PNGCBAPI count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data) { png_bytep dp = data; - if (png_ptr == NULL)return; + if (png_ptr == NULL) + return; /* Contents of row_info: * png_uint_32 width width of row @@ -176,41 +220,49 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data) { int pos = 0; png_uint_32 n, nstop; + for (n = 0, nstop=row_info->width; nbit_depth == 1) { if (((*dp << pos++ ) & 0x80) == 0) zero_samples++; + if (pos == 8) { pos = 0; dp++; } } + if (row_info->bit_depth == 2) { if (((*dp << (pos+=2)) & 0xc0) == 0) zero_samples++; + if (pos == 8) { pos = 0; dp++; } } + if (row_info->bit_depth == 4) { if (((*dp << (pos+=4)) & 0xf0) == 0) zero_samples++; + if (pos == 8) { pos = 0; dp++; } } + if (row_info->bit_depth == 8) if (*dp++ == 0) zero_samples++; + if (row_info->bit_depth == 16) { if ((*dp | *(dp+1)) == 0) @@ -233,10 +285,12 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data) if (row_info->bit_depth == 8) if (*dp++ == 0) zero_samples++; + if (row_info->bit_depth == 16) { if ((*dp | *(dp+1)) == 0) zero_samples++; + dp+=2; } } @@ -251,8 +305,6 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data) } #endif /* PNG_WRITE_USER_TRANSFORM_SUPPORTED */ -static int wrote_question = 0; - #ifndef PNG_STDIO_SUPPORTED /* START of code to validate stdio-free compilation */ /* These copies of the default read/write functions come from pngrio.c and @@ -305,8 +357,7 @@ pngtest_check_io_state(png_structp png_ptr, png_size_t data_length, } #endif -#ifndef USE_FAR_KEYWORD -static void +static void PNGCBAPI pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length) { png_size_t check = 0; @@ -330,64 +381,13 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length) pngtest_check_io_state(png_ptr, length, PNG_IO_READING); #endif } -#else -/* This is the model-independent version. Since the standard I/O library - can't handle far buffers in the medium and small models, we have to copy - the data. -*/ - -#define NEAR_BUF_SIZE 1024 -#define MIN(a,b) (a <= b ? a : b) - -static void -pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length) -{ - png_size_t check; - png_byte *n_data; - png_FILE_p io_ptr; - - /* Check if data really is near. If so, use usual code. */ - n_data = (png_byte *)CVT_PTR_NOCHECK(data); - io_ptr = (png_FILE_p)CVT_PTR(png_get_io_ptr(png_ptr)); - if ((png_bytep)n_data == data) - { - check = fread(n_data, 1, length, io_ptr); - } - else - { - png_byte buf[NEAR_BUF_SIZE]; - png_size_t read, remaining, err; - check = 0; - remaining = length; - do - { - read = MIN(NEAR_BUF_SIZE, remaining); - err = fread(buf, 1, 1, io_ptr); - png_memcpy(data, buf, read); /* Copy far buffer to near buffer */ - if (err != read) - break; - else - check += err; - data += read; - remaining -= read; - } - while (remaining != 0); - } - if (check != length) - png_error(png_ptr, "Read Error"); - -#ifdef PNG_IO_STATE_SUPPORTED - pngtest_check_io_state(png_ptr, length, PNG_IO_READING); -#endif -} -#endif /* USE_FAR_KEYWORD */ #ifdef PNG_WRITE_FLUSH_SUPPORTED -static void +static void PNGCBAPI pngtest_flush(png_structp png_ptr) { /* Do nothing; fflush() is said to be just a waste of energy. */ - png_ptr = png_ptr; /* Stifle compiler warning */ + PNG_UNUSED(png_ptr) /* Stifle compiler warning */ } #endif @@ -396,15 +396,13 @@ pngtest_flush(png_structp png_ptr) * write_data function and use it at run time with png_set_write_fn(), rather * than changing the library. */ -#ifndef USE_FAR_KEYWORD -static void +static void PNGCBAPI pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length) { png_size_t check; - png_FILE_p io_ptr; - io_ptr = (png_FILE_p)CVT_PTR(png_get_io_ptr(png_ptr)); - check = fwrite(data, 1, length, io_ptr); + check = fwrite(data, 1, length, (png_FILE_p)png_get_io_ptr(png_ptr)); + if (check != length) { png_error(png_ptr, "Write Error"); @@ -414,75 +412,31 @@ pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length) pngtest_check_io_state(png_ptr, length, PNG_IO_WRITING); #endif } -#else -/* This is the model-independent version. Since the standard I/O library - can't handle far buffers in the medium and small models, we have to copy - the data. -*/ - -#define NEAR_BUF_SIZE 1024 -#define MIN(a,b) (a <= b ? a : b) - -static void -pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length) -{ - png_size_t check; - png_byte *near_data; /* Needs to be "png_byte *" instead of "png_bytep" */ - png_FILE_p io_ptr; - - /* Check if data really is near. If so, use usual code. */ - near_data = (png_byte *)CVT_PTR_NOCHECK(data); - io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr); - if ((png_bytep)near_data == data) - { - check = fwrite(near_data, 1, length, io_ptr); - } - else - { - png_byte buf[NEAR_BUF_SIZE]; - png_size_t written, remaining, err; - check = 0; - remaining = length; - do - { - written = MIN(NEAR_BUF_SIZE, remaining); - png_memcpy(buf, data, written); /* Copy far buffer to near buffer */ - err = fwrite(buf, 1, written, io_ptr); - if (err != written) - break; - else - check += err; - data += written; - remaining -= written; - } - while (remaining != 0); - } - if (check != length) - { - png_error(png_ptr, "Write Error"); - } - -#ifdef PNG_IO_STATE_SUPPORTED - pngtest_check_io_state(png_ptr, length, PNG_IO_WRITING); -#endif -} -#endif /* USE_FAR_KEYWORD */ +#endif /* !PNG_STDIO_SUPPORTED */ /* This function is called when there is a warning, but the library thinks * it can continue anyway. Replacement functions don't have to do anything * here if you don't want to. In the default configuration, png_ptr is * not used, but it is passed in case it may be useful. */ -static void +typedef struct +{ + PNG_CONST char *file_name; +} pngtest_error_parameters; + +static void PNGCBAPI pngtest_warning(png_structp png_ptr, png_const_charp message) { PNG_CONST char *name = "UNKNOWN (ERROR!)"; - char *test; - test = png_get_error_ptr(png_ptr); - if (test == NULL) - fprintf(STDERR, "%s: libpng warning: %s\n", name, message); - else - fprintf(STDERR, "%s: libpng warning: %s\n", test, message); + pngtest_error_parameters *test = + (pngtest_error_parameters*)png_get_error_ptr(png_ptr); + + ++warning_count; + + if (test != NULL && test->file_name != NULL) + name = test->file_name; + + fprintf(STDERR, "%s: libpng warning: %s\n", name, message); } /* This is the default error handling function. Note that replacements for @@ -490,15 +444,17 @@ pngtest_warning(png_structp png_ptr, png_const_charp message) * function is used by default, or if the program supplies NULL for the * error function pointer in png_set_error_fn(). */ -static void +static void PNGCBAPI pngtest_error(png_structp png_ptr, png_const_charp message) { + ++error_count; + pngtest_warning(png_ptr, message); /* We can return because png_error calls the default handler, which is * actually OK in this case. */ } -#endif /* !PNG_STDIO_SUPPORTED */ + /* END of code to validate stdio-free compilation */ /* START of code to validate memory allocation and deallocation */ @@ -517,9 +473,9 @@ typedef struct memory_information { png_alloc_size_t size; png_voidp pointer; - struct memory_information FAR *next; + struct memory_information *next; } memory_information; -typedef memory_information FAR *memory_infop; +typedef memory_information *memory_infop; static memory_infop pinformation = NULL; static int current_allocation = 0; @@ -527,12 +483,12 @@ static int maximum_allocation = 0; static int total_allocation = 0; static int num_allocations = 0; -png_voidp png_debug_malloc - PNGARG((png_structp png_ptr, png_alloc_size_t size)); -void png_debug_free PNGARG((png_structp png_ptr, png_voidp ptr)); +png_voidp PNGCBAPI png_debug_malloc PNGARG((png_structp png_ptr, + png_alloc_size_t size)); +void PNGCBAPI png_debug_free PNGARG((png_structp png_ptr, png_voidp ptr)); png_voidp -png_debug_malloc(png_structp png_ptr, png_alloc_size_t size) +PNGCBAPI png_debug_malloc(png_structp png_ptr, png_alloc_size_t size) { /* png_malloc has already tested for NULL; png_create_struct calls @@ -549,17 +505,21 @@ png_debug_malloc(png_structp png_ptr, png_alloc_size_t size) memory_infop pinfo; png_set_mem_fn(png_ptr, NULL, NULL, NULL); pinfo = (memory_infop)png_malloc(png_ptr, - png_sizeof(*pinfo)); + (sizeof *pinfo)); pinfo->size = size; current_allocation += size; total_allocation += size; num_allocations ++; + if (current_allocation > maximum_allocation) maximum_allocation = current_allocation; + pinfo->pointer = png_malloc(png_ptr, size); /* Restore malloc_fn and free_fn */ + png_set_mem_fn(png_ptr, NULL, png_debug_malloc, png_debug_free); + if (size != 0 && pinfo->pointer == NULL) { current_allocation -= size; @@ -567,23 +527,27 @@ png_debug_malloc(png_structp png_ptr, png_alloc_size_t size) png_error(png_ptr, "out of memory in pngtest->png_debug_malloc"); } + pinfo->next = pinformation; pinformation = pinfo; /* Make sure the caller isn't assuming zeroed memory. */ - png_memset(pinfo->pointer, 0xdd, pinfo->size); + memset(pinfo->pointer, 0xdd, pinfo->size); + if (verbose) - printf("png_malloc %lu bytes at %x\n", (unsigned long)size, + printf("png_malloc %lu bytes at %p\n", (unsigned long)size, pinfo->pointer); + return (png_voidp)(pinfo->pointer); } } /* Free a pointer. It is removed from the list at the same time. */ -void +void PNGCBAPI png_debug_free(png_structp png_ptr, png_voidp ptr) { if (png_ptr == NULL) fprintf(STDERR, "NULL pointer to png_debug_free.\n"); + if (ptr == 0) { #if 0 /* This happens all the time. */ @@ -594,10 +558,12 @@ png_debug_free(png_structp png_ptr, png_voidp ptr) /* Unlink the element from the list. */ { - memory_infop FAR *ppinfo = &pinformation; + memory_infop *ppinfo = &pinformation; + for (;;) { memory_infop pinfo = *ppinfo; + if (pinfo->pointer == ptr) { *ppinfo = pinfo->next; @@ -606,23 +572,26 @@ png_debug_free(png_structp png_ptr, png_voidp ptr) fprintf(STDERR, "Duplicate free of memory\n"); /* We must free the list element too, but first kill the memory that is to be freed. */ - png_memset(ptr, 0x55, pinfo->size); + memset(ptr, 0x55, pinfo->size); png_free_default(png_ptr, pinfo); pinfo = NULL; break; } + if (pinfo->next == NULL) { fprintf(STDERR, "Pointer %x not found\n", (unsigned int)ptr); break; } + ppinfo = &pinfo->next; } } /* Finally free the data. */ if (verbose) - printf("Freeing %x\n", ptr); + printf("Freeing %p\n", ptr); + png_free_default(png_ptr, ptr); ptr = NULL; } @@ -630,25 +599,73 @@ png_debug_free(png_structp png_ptr, png_voidp ptr) /* END of code to test memory allocation/deallocation */ +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED /* Demonstration of user chunk support of the sTER and vpAg chunks */ -#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED /* (sTER is a public chunk not yet known by libpng. vpAg is a private chunk used in ImageMagick to store "virtual page" size). */ -static png_uint_32 user_chunk_data[4]; +static struct user_chunk_data +{ + png_const_infop info_ptr; + png_uint_32 vpAg_width, vpAg_height; + png_byte vpAg_units; + png_byte sTER_mode; + int location[2]; +} +user_chunk_data; - /* 0: sTER mode + 1 - * 1: vpAg width - * 2: vpAg height - * 3: vpAg units - */ +/* Used for location and order; zero means nothing. */ +#define have_sTER 0x01 +#define have_vpAg 0x02 +#define before_PLTE 0x10 +#define before_IDAT 0x20 +#define after_IDAT 0x40 -static int read_user_chunk_callback(png_struct *png_ptr, +static void +init_callback_info(png_const_infop info_ptr) +{ + MEMZERO(user_chunk_data); + user_chunk_data.info_ptr = info_ptr; +} + +static int +set_location(png_structp png_ptr, struct user_chunk_data *data, int what) +{ + int location; + + if ((data->location[0] & what) || (data->location[1] & what)) + return 0; /* already have one of these */ + + /* Find where we are (the code below zeros info_ptr to indicate that the + * chunks before the first IDAT have been read.) + */ + if (data->info_ptr == NULL) /* after IDAT */ + location = what | after_IDAT; + + else if (png_get_valid(png_ptr, data->info_ptr, PNG_INFO_PLTE)) + location = what | before_IDAT; + + else + location = what | before_PLTE; + + if (data->location[0] == 0) + data->location[0] = location; + + else + data->location[1] = location; + + return 1; /* handled */ +} + +static int PNGCBAPI read_user_chunk_callback(png_struct *png_ptr, png_unknown_chunkp chunk) { - png_uint_32 - *my_user_chunk_data; + struct user_chunk_data *my_user_chunk_data = + (struct user_chunk_data*)png_get_user_chunk_ptr(png_ptr); + + if (my_user_chunk_data == NULL) + png_error(png_ptr, "lost user chunk pointer"); /* Return one of the following: * return (-n); chunk had an error @@ -669,11 +686,18 @@ static int read_user_chunk_callback(png_struct *png_ptr, /* Found sTER chunk */ if (chunk->size != 1) return (-1); /* Error return */ + if (chunk->data[0] != 0 && chunk->data[0] != 1) return (-1); /* Invalid mode */ - my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr); - my_user_chunk_data[0]=chunk->data[0]+1; - return (1); + + if (set_location(png_ptr, my_user_chunk_data, have_sTER)) + { + my_user_chunk_data->sTER_mode=chunk->data[0]; + return (1); + } + + else + return (0); /* duplicate sTER - give it to libpng */ } if (chunk->name[0] != 118 || chunk->name[1] != 112 || /* v p */ @@ -685,24 +709,119 @@ static int read_user_chunk_callback(png_struct *png_ptr, if (chunk->size != 9) return (-1); /* Error return */ - my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr); + if (!set_location(png_ptr, my_user_chunk_data, have_vpAg)) + return (0); /* duplicate vpAg */ - my_user_chunk_data[1]=png_get_uint_31(png_ptr, chunk->data); - my_user_chunk_data[2]=png_get_uint_31(png_ptr, chunk->data + 4); - my_user_chunk_data[3]=(png_uint_32)chunk->data[8]; + my_user_chunk_data->vpAg_width = png_get_uint_31(png_ptr, chunk->data); + my_user_chunk_data->vpAg_height = png_get_uint_31(png_ptr, chunk->data + 4); + my_user_chunk_data->vpAg_units = chunk->data[8]; return (1); - } + +#ifdef PNG_WRITE_SUPPORTED +static void +write_sTER_chunk(png_structp write_ptr) +{ + png_byte png_sTER[5] = {115, 84, 69, 82, '\0'}; + + if (verbose) + fprintf(STDERR, "\n stereo mode = %d\n", user_chunk_data.sTER_mode); + + png_write_chunk(write_ptr, png_sTER, &user_chunk_data.sTER_mode, 1); +} + +static void +write_vpAg_chunk(png_structp write_ptr) +{ + png_byte png_vpAg[5] = {118, 112, 65, 103, '\0'}; + + png_byte vpag_chunk_data[9]; + + if (verbose) + fprintf(STDERR, " vpAg = %lu x %lu, units = %d\n", + (unsigned long)user_chunk_data.vpAg_width, + (unsigned long)user_chunk_data.vpAg_height, + user_chunk_data.vpAg_units); + + png_save_uint_32(vpag_chunk_data, user_chunk_data.vpAg_width); + png_save_uint_32(vpag_chunk_data + 4, user_chunk_data.vpAg_height); + vpag_chunk_data[8] = user_chunk_data.vpAg_units; + png_write_chunk(write_ptr, png_vpAg, vpag_chunk_data, 9); +} + +static void +write_chunks(png_structp write_ptr, int location) +{ + int i; + + /* Notice that this preserves the original chunk order, however chunks + * intercepted by the callback will be written *after* chunks passed to + * libpng. This will actually reverse a pair of sTER chunks or a pair of + * vpAg chunks, resulting in an error later. This is not worth worrying + * about - the chunks should not be duplicated! + */ + for (i=0; i<2; ++i) + { + if (user_chunk_data.location[i] == (location | have_sTER)) + write_sTER_chunk(write_ptr); + + else if (user_chunk_data.location[i] == (location | have_vpAg)) + write_vpAg_chunk(write_ptr); + } +} +#endif /* PNG_WRITE_SUPPORTED */ +#else /* !PNG_READ_USER_CHUNKS_SUPPORTED */ +# define write_chunks(pp,loc) ((void)0) #endif /* END of code to demonstrate user chunk support */ +/* START of code to check that libpng has the required text support; this only + * checks for the write support because if read support is missing the chunk + * will simply not be reported back to pngtest. + */ +#ifdef PNG_TEXT_SUPPORTED +static void +pngtest_check_text_support(png_const_structp png_ptr, png_textp text_ptr, + int num_text) +{ + while (num_text > 0) + { + switch (text_ptr[--num_text].compression) + { + case PNG_TEXT_COMPRESSION_NONE: + break; + + case PNG_TEXT_COMPRESSION_zTXt: +# ifndef PNG_WRITE_zTXt_SUPPORTED + ++unsupported_chunks; +# endif + break; + + case PNG_ITXT_COMPRESSION_NONE: + case PNG_ITXT_COMPRESSION_zTXt: +# ifndef PNG_WRITE_iTXt_SUPPORTED + ++unsupported_chunks; +# endif + break; + + default: + /* This is an error */ + png_error(png_ptr, "invalid text chunk compression field"); + break; + } + } +} +#endif +/* END of code to check that libpng has the required text support */ + /* Test one file */ -int +static int test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) { static png_FILE_p fpin; static png_FILE_p fpout; /* "static" prevents setjmp corruption */ + pngtest_error_parameters error_parameters; png_structp read_ptr; png_infop read_info_ptr, end_info_ptr; #ifdef PNG_WRITE_SUPPORTED @@ -719,15 +838,9 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) png_uint_32 width, height; int num_pass, pass; int bit_depth, color_type; -#ifdef PNG_SETJMP_SUPPORTED -#ifdef USE_FAR_KEYWORD - jmp_buf jmpbuf; -#endif -#endif - - char inbuf[256], outbuf[256]; row_buf = NULL; + error_parameters.file_name = inname; if ((fpin = fopen(inname, "rb")) == NULL) { @@ -742,30 +855,18 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) return (1); } - png_debug(0, "Allocating read and write structures"); + pngtest_debug("Allocating read and write structures"); #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG read_ptr = png_create_read_struct_2(PNG_LIBPNG_VER_STRING, NULL, - NULL, NULL, NULL, - (png_malloc_ptr)png_debug_malloc, (png_free_ptr)png_debug_free); + NULL, NULL, NULL, png_debug_malloc, png_debug_free); #else read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); #endif -#ifndef PNG_STDIO_SUPPORTED - png_set_error_fn(read_ptr, (png_voidp)inname, pngtest_error, - pngtest_warning); -#endif + png_set_error_fn(read_ptr, &error_parameters, pngtest_error, + pngtest_warning); -#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED - user_chunk_data[0] = 0; - user_chunk_data[1] = 0; - user_chunk_data[2] = 0; - user_chunk_data[3] = 0; - png_set_read_user_chunk_fn(read_ptr, user_chunk_data, - read_user_chunk_callback); - -#endif #ifdef PNG_WRITE_SUPPORTED #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG write_ptr = @@ -775,12 +876,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); #endif -#ifndef PNG_STDIO_SUPPORTED - png_set_error_fn(write_ptr, (png_voidp)inname, pngtest_error, - pngtest_warning); + png_set_error_fn(write_ptr, &error_parameters, pngtest_error, + pngtest_warning); #endif -#endif - png_debug(0, "Allocating read_info, write_info and end_info structures"); + pngtest_debug("Allocating read_info, write_info and end_info structures"); read_info_ptr = png_create_info_struct(read_ptr); end_info_ptr = png_create_info_struct(read_ptr); #ifdef PNG_WRITE_SUPPORTED @@ -788,13 +887,15 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) write_end_info_ptr = png_create_info_struct(write_ptr); #endif -#ifdef PNG_SETJMP_SUPPORTED - png_debug(0, "Setting jmpbuf for read struct"); -#ifdef USE_FAR_KEYWORD - if (setjmp(jmpbuf)) -#else - if (setjmp(png_jmpbuf(read_ptr))) +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED + init_callback_info(read_info_ptr); + png_set_read_user_chunk_fn(read_ptr, &user_chunk_data, + read_user_chunk_callback); #endif + +#ifdef PNG_SETJMP_SUPPORTED + pngtest_debug("Setting jmpbuf for read struct"); + if (setjmp(png_jmpbuf(read_ptr))) { fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname); png_free(read_ptr, row_buf); @@ -808,17 +909,11 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) FCLOSE(fpout); return (1); } -#ifdef USE_FAR_KEYWORD - png_memcpy(png_jmpbuf(read_ptr), jmpbuf, png_sizeof(jmp_buf)); -#endif #ifdef PNG_WRITE_SUPPORTED - png_debug(0, "Setting jmpbuf for write struct"); -#ifdef USE_FAR_KEYWORD - if (setjmp(jmpbuf)) -#else + pngtest_debug("Setting jmpbuf for write struct"); + if (setjmp(png_jmpbuf(write_ptr))) -#endif { fprintf(STDERR, "%s -> %s: libpng write error\n", inname, outname); png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr); @@ -830,13 +925,36 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) FCLOSE(fpout); return (1); } -#ifdef USE_FAR_KEYWORD - png_memcpy(png_jmpbuf(write_ptr), jmpbuf, png_sizeof(jmp_buf)); -#endif #endif #endif - png_debug(0, "Initializing input and output streams"); + if (strict) + { + /* Treat png_benign_error() as errors on read */ + png_set_benign_errors(read_ptr, 0); + +#ifdef PNG_WRITE_SUPPORTED + /* Treat them as errors on write */ + png_set_benign_errors(write_ptr, 0); +#endif + + /* if strict is not set, then app warnings and errors are treated as + * warnings in release builds, but not in unstable builds; this can be + * changed with '--relaxed'. + */ + } + + else if (relaxed) + { + /* Allow application (pngtest) errors and warnings to pass */ + png_set_benign_errors(read_ptr, 1); + +#ifdef PNG_WRITE_SUPPORTED + png_set_benign_errors(write_ptr, 1); +#endif + } + + pngtest_debug("Initializing input and output streams"); #ifdef PNG_STDIO_SUPPORTED png_init_io(read_ptr, fpin); # ifdef PNG_WRITE_SUPPORTED @@ -853,6 +971,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) # endif # endif #endif + if (status_dots_requested == 1) { #ifdef PNG_WRITE_SUPPORTED @@ -860,6 +979,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) #endif png_set_read_status_fn(read_ptr, read_row_callback); } + else { #ifdef PNG_WRITE_SUPPORTED @@ -871,8 +991,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED { int i; + for (i = 0; i<256; i++) filters_used[i] = 0; + png_set_read_user_transform_fn(read_ptr, count_filters); } #endif @@ -881,25 +1003,38 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) png_set_write_user_transform_fn(write_ptr, count_zero_samples); #endif -#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED -# ifndef PNG_HANDLE_CHUNK_ALWAYS -# define PNG_HANDLE_CHUNK_ALWAYS 3 -# endif +#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED + /* Preserve all the unknown chunks, if possible. If this is disabled then, + * even if the png_{get,set}_unknown_chunks stuff is enabled, we can't use + * libpng to *save* the unknown chunks on read (because we can't switch the + * save option on!) + * + * Notice that if SET_UNKNOWN_CHUNKS is *not* supported read will discard all + * unknown chunks and write will write them all. + */ +#ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED png_set_keep_unknown_chunks(read_ptr, PNG_HANDLE_CHUNK_ALWAYS, NULL, 0); #endif #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED -# ifndef PNG_HANDLE_CHUNK_IF_SAFE -# define PNG_HANDLE_CHUNK_IF_SAFE 2 -# endif - png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_IF_SAFE, + png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_ALWAYS, NULL, 0); +#endif #endif - png_debug(0, "Reading info struct"); + pngtest_debug("Reading info struct"); png_read_info(read_ptr, read_info_ptr); - png_debug(0, "Transferring info struct"); +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED + /* This is a bit of a hack; there is no obvious way in the callback function + * to determine that the chunks before the first IDAT have been read, so + * remove the info_ptr (which is only used to determine position relative to + * PLTE) here to indicate that we are after the IDAT. + */ + user_chunk_data.info_ptr = NULL; +#endif + + pngtest_debug("Transferring info struct"); { int interlace_type, compression_type, filter_type; @@ -919,6 +1054,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) { png_fixed_point white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y; + if (png_get_cHRM_fixed(read_ptr, read_info_ptr, &white_x, &white_y, &red_x, &red_y, &green_x, &green_y, &blue_x, &blue_y)) { @@ -941,6 +1077,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) { double white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y; + if (png_get_cHRM(read_ptr, read_info_ptr, &white_x, &white_y, &red_x, &red_y, &green_x, &green_y, &blue_x, &blue_y)) { @@ -962,7 +1099,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) #ifdef PNG_iCCP_SUPPORTED { png_charp name; - png_charp profile; + png_bytep profile; png_uint_32 proflen; int compression_type; @@ -1052,7 +1189,8 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) } #endif #ifdef PNG_sCAL_SUPPORTED -#ifdef PNG_FLOATING_POINT_SUPPORTED +#if defined(PNG_FLOATING_POINT_SUPPORTED) && \ + defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) { int unit; double scal_width, scal_height; @@ -1086,7 +1224,22 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) if (png_get_text(read_ptr, read_info_ptr, &text_ptr, &num_text) > 0) { - png_debug1(0, "Handling %d iTXt/tEXt/zTXt chunks", num_text); + pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text); + + pngtest_check_text_support(read_ptr, text_ptr, num_text); + + if (verbose) + { + int i; + + printf("\n"); + for (i=0; i 0) { - png_debug1(0, "Handling %d iTXt/tEXt/zTXt chunks", num_text); + pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text); + + pngtest_check_text_support(read_ptr, text_ptr, num_text); + + if (verbose) + { + int i; + + printf("\n"); + for (i=0; i 0) + { + /* We don't really expect to get here because of the setjmp handling + * above, but this is safe. + */ + fprintf(STDERR, "\n %s: %d libpng errors found (%d warnings)", + inname, error_count, warning_count); + + if (strict != 0) + return (1); + } + +# ifdef PNG_WRITE_SUPPORTED + /* If there we no write support nothing was written! */ + else if (unsupported_chunks > 0) + { + fprintf(STDERR, "\n %s: unsupported chunks (%d)%s", + inname, unsupported_chunks, strict ? ": IGNORED --strict!" : ""); + } +# endif + + else if (warning_count > 0) + { + fprintf(STDERR, "\n %s: %d libpng warnings found", + inname, warning_count); + + if (strict != 0) + return (1); + } + + pngtest_debug("Opening files for comparison"); if ((fpin = fopen(inname, "rb")) == NULL) { fprintf(STDERR, "Could not find file %s\n", inname); @@ -1368,57 +1574,85 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) return (1); } - for (;;) +#ifdef PNG_WRITE_SUPPORTED /* else nothing was written */ { - png_size_t num_in, num_out; + int wrote_question = 0; - num_in = fread(inbuf, 1, 1, fpin); - num_out = fread(outbuf, 1, 1, fpout); - - if (num_in != num_out) + for (;;) { - fprintf(STDERR, "\nFiles %s and %s are of a different size\n", - inname, outname); - if (wrote_question == 0) - { - fprintf(STDERR, - " Was %s written with the same maximum IDAT chunk size (%d bytes),", - inname, PNG_ZBUF_SIZE); - fprintf(STDERR, - "\n filtering heuristic (libpng default), compression"); - fprintf(STDERR, - " level (zlib default),\n and zlib version (%s)?\n\n", - ZLIB_VERSION); - wrote_question = 1; - } - FCLOSE(fpin); - FCLOSE(fpout); - return (0); - } + png_size_t num_in, num_out; + char inbuf[256], outbuf[256]; - if (!num_in) - break; - if (png_memcmp(inbuf, outbuf, num_in)) - { - fprintf(STDERR, "\nFiles %s and %s are different\n", inname, outname); - if (wrote_question == 0) + num_in = fread(inbuf, 1, sizeof inbuf, fpin); + num_out = fread(outbuf, 1, sizeof outbuf, fpout); + + if (num_in != num_out) { - fprintf(STDERR, + fprintf(STDERR, "\nFiles %s and %s are of a different size\n", + inname, outname); + + if (wrote_question == 0 && unsupported_chunks == 0) + { + fprintf(STDERR, " Was %s written with the same maximum IDAT chunk size (%d bytes),", inname, PNG_ZBUF_SIZE); - fprintf(STDERR, - "\n filtering heuristic (libpng default), compression"); - fprintf(STDERR, - " level (zlib default),\n and zlib version (%s)?\n\n", - ZLIB_VERSION); - wrote_question = 1; + fprintf(STDERR, + "\n filtering heuristic (libpng default), compression"); + fprintf(STDERR, + " level (zlib default),\n and zlib version (%s)?\n\n", + ZLIB_VERSION); + wrote_question = 1; + } + + FCLOSE(fpin); + FCLOSE(fpout); + + if (strict != 0 && unsupported_chunks == 0) + return (1); + + else + return (0); + } + + if (!num_in) + break; + + if (memcmp(inbuf, outbuf, num_in)) + { + fprintf(STDERR, "\nFiles %s and %s are different\n", inname, + outname); + + if (wrote_question == 0 && unsupported_chunks == 0) + { + fprintf(STDERR, + " Was %s written with the same maximum IDAT chunk size (%d bytes),", + inname, PNG_ZBUF_SIZE); + fprintf(STDERR, + "\n filtering heuristic (libpng default), compression"); + fprintf(STDERR, + " level (zlib default),\n and zlib version (%s)?\n\n", + ZLIB_VERSION); + wrote_question = 1; + } + + FCLOSE(fpin); + FCLOSE(fpout); + + /* NOTE: the unsupported_chunks escape is permitted here because + * unsupported text chunk compression will result in the compression + * mode being changed (to NONE) yet, in the test case, the result + * can be exactly the same size! + */ + if (strict != 0 && unsupported_chunks == 0) + return (1); + + else + return (0); } - FCLOSE(fpin); - FCLOSE(fpout); - return (0); } } +#endif /* PNG_WRITE_SUPPORTED */ FCLOSE(fpin); FCLOSE(fpout); @@ -1448,11 +1682,10 @@ main(int argc, char *argv[]) fprintf(STDERR, " library (%lu):%s", (unsigned long)png_access_version_number(), png_get_header_version(NULL)); + /* Show the version of libpng used in building the application */ fprintf(STDERR, " pngtest (%lu):%s", (unsigned long)PNG_LIBPNG_VER, PNG_HEADER_VERSION_STRING); - fprintf(STDERR, " sizeof(png_struct)=%ld, sizeof(png_info)=%ld\n", - (long)png_sizeof(png_struct), (long)png_sizeof(png_info)); /* Do some consistency checking on the memory allocation settings, I'm * not sure this matters, but it is nice to know, the first of these @@ -1483,6 +1716,7 @@ main(int argc, char *argv[]) multiple = 1; status_dots_requested = 0; } + else if (strcmp(argv[1], "-mv") == 0 || strcmp(argv[1], "-vm") == 0 ) { @@ -1490,12 +1724,32 @@ main(int argc, char *argv[]) verbose = 1; status_dots_requested = 1; } + else if (strcmp(argv[1], "-v") == 0) { verbose = 1; status_dots_requested = 1; inname = argv[2]; } + + else if (strcmp(argv[1], "--strict") == 0) + { + status_dots_requested = 0; + verbose = 1; + inname = argv[2]; + strict++; + relaxed = 0; + } + + else if (strcmp(argv[1], "--relaxed") == 0) + { + status_dots_requested = 0; + verbose = 1; + inname = argv[2]; + strict = 0; + relaxed++; + } + else { inname = argv[1]; @@ -1549,9 +1803,11 @@ main(int argc, char *argv[]) #ifdef PNG_TIME_RFC1123_SUPPORTED if (tIME_chunk_present != 0) fprintf(STDERR, " tIME = %s\n", tIME_string); + tIME_chunk_present = 0; #endif /* PNG_TIME_RFC1123_SUPPORTED */ } + else { fprintf(STDERR, " FAIL\n"); @@ -1561,17 +1817,19 @@ main(int argc, char *argv[]) if (allocation_now != current_allocation) fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n", current_allocation - allocation_now); + if (current_allocation != 0) { memory_infop pinfo = pinformation; fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n", current_allocation); + while (pinfo != NULL) { fprintf(STDERR, " %lu bytes at %x\n", (unsigned long)pinfo->size, - (unsigned int) pinfo->pointer); + (unsigned int)pinfo->pointer); pinfo = pinfo->next; } } @@ -1588,6 +1846,7 @@ main(int argc, char *argv[]) num_allocations); #endif } + else { int i; @@ -1597,11 +1856,17 @@ main(int argc, char *argv[]) #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG int allocation_now = current_allocation; #endif - if (i == 1) status_dots_requested = 1; - else if (verbose == 0)status_dots_requested = 0; + if (i == 1) + status_dots_requested = 1; + + else if (verbose == 0) + status_dots_requested = 0; + if (i == 0 || verbose == 1 || ierror != 0) fprintf(STDERR, "\n Testing %s:", inname); + kerror = test_one_file(inname, outname); + if (kerror == 0) { if (verbose == 1 || i == 2) @@ -1627,10 +1892,12 @@ main(int argc, char *argv[]) #endif /* PNG_TIME_RFC1123_SUPPORTED */ } } + else { if (verbose == 0 && i != 2) fprintf(STDERR, "\n Testing %s:", inname); + fprintf(STDERR, " FAIL\n"); ierror += kerror; } @@ -1638,12 +1905,14 @@ main(int argc, char *argv[]) if (allocation_now != current_allocation) fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n", current_allocation - allocation_now); + if (current_allocation != 0) { memory_infop pinfo = pinformation; fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n", current_allocation); + while (pinfo != NULL) { fprintf(STDERR, " %lu bytes at %x\n", @@ -1681,10 +1950,22 @@ main(int argc, char *argv[]) if (ierror == 0) fprintf(STDERR, " libpng passes test\n"); + else fprintf(STDERR, " libpng FAILS test\n"); + return (int)(ierror != 0); } +#else +int +main(void) +{ + fprintf(STDERR, + " test ignored because libpng was not built with read support\n"); + /* And skip this test */ + return 77; +} +#endif /* Generate a compiler error if there is an old png.h in the search path. */ -typedef version_1_4_6beta06 your_png_h_is_not_version_1_4_6beta06; +typedef png_libpng_version_1_6_6 Your_png_h_is_not_version_1_6_6; diff --git a/project/jni/png/pngtrans.c b/project/jni/png/pngtrans.c index df17e880c..8f8bc5d9e 100644 --- a/project/jni/png/pngtrans.c +++ b/project/jni/png/pngtrans.c @@ -1,8 +1,8 @@ /* pngtrans.c - transforms the data in a row (used by both readers and writers) * - * Last changed in libpng 1.4.6 [January 23, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.2 [April 25, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -11,20 +11,20 @@ * and license in png.h */ -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" -#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) #include "pngpriv.h" +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) + #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) /* Turn on BGR-to-RGB mapping */ void PNGAPI -png_set_bgr(png_structp png_ptr) +png_set_bgr(png_structrp png_ptr) { png_debug(1, "in png_set_bgr"); if (png_ptr == NULL) return; + png_ptr->transformations |= PNG_BGR; } #endif @@ -32,12 +32,13 @@ png_set_bgr(png_structp png_ptr) #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) /* Turn on 16 bit byte swapping */ void PNGAPI -png_set_swap(png_structp png_ptr) +png_set_swap(png_structrp png_ptr) { png_debug(1, "in png_set_swap"); if (png_ptr == NULL) return; + if (png_ptr->bit_depth == 16) png_ptr->transformations |= PNG_SWAP_BYTES; } @@ -46,12 +47,13 @@ png_set_swap(png_structp png_ptr) #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) /* Turn on pixel packing */ void PNGAPI -png_set_packing(png_structp png_ptr) +png_set_packing(png_structrp png_ptr) { png_debug(1, "in png_set_packing"); if (png_ptr == NULL) return; + if (png_ptr->bit_depth < 8) { png_ptr->transformations |= PNG_PACK; @@ -63,12 +65,13 @@ png_set_packing(png_structp png_ptr) #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) /* Turn on packed pixel swapping */ void PNGAPI -png_set_packswap(png_structp png_ptr) +png_set_packswap(png_structrp png_ptr) { png_debug(1, "in png_set_packswap"); if (png_ptr == NULL) return; + if (png_ptr->bit_depth < 8) png_ptr->transformations |= PNG_PACKSWAP; } @@ -76,12 +79,13 @@ png_set_packswap(png_structp png_ptr) #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) void PNGAPI -png_set_shift(png_structp png_ptr, png_color_8p true_bits) +png_set_shift(png_structrp png_ptr, png_const_color_8p true_bits) { png_debug(1, "in png_set_shift"); if (png_ptr == NULL) return; + png_ptr->transformations |= PNG_SHIFT; png_ptr->shift = *true_bits; } @@ -90,7 +94,7 @@ png_set_shift(png_structp png_ptr, png_color_8p true_bits) #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ defined(PNG_WRITE_INTERLACING_SUPPORTED) int PNGAPI -png_set_interlace_handling(png_structp png_ptr) +png_set_interlace_handling(png_structrp png_ptr) { png_debug(1, "in png_set_interlace handling"); @@ -111,48 +115,101 @@ png_set_interlace_handling(png_structp png_ptr) * that don't like bytes as parameters. */ void PNGAPI -png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc) +png_set_filler(png_structrp png_ptr, png_uint_32 filler, int filler_loc) { png_debug(1, "in png_set_filler"); if (png_ptr == NULL) return; + + /* In libpng 1.6 it is possible to determine whether this is a read or write + * operation and therefore to do more checking here for a valid call. + */ + if (png_ptr->mode & PNG_IS_READ_STRUCT) + { +# ifdef PNG_READ_FILLER_SUPPORTED + /* On read png_set_filler is always valid, regardless of the base PNG + * format, because other transformations can give a format where the + * filler code can execute (basically an 8 or 16-bit component RGB or G + * format.) + * + * NOTE: usr_channels is not used by the read code! (This has led to + * confusion in the past.) The filler is only used in the read code. + */ + png_ptr->filler = (png_uint_16)filler; +# else + png_app_error(png_ptr, "png_set_filler not supported on read"); + PNG_UNUSED(filler) /* not used in the write case */ + return; +# endif + } + + else /* write */ + { +# ifdef PNG_WRITE_FILLER_SUPPORTED + /* On write the usr_channels parameter must be set correctly at the + * start to record the number of channels in the app-supplied data. + */ + switch (png_ptr->color_type) + { + case PNG_COLOR_TYPE_RGB: + png_ptr->usr_channels = 4; + break; + + case PNG_COLOR_TYPE_GRAY: + if (png_ptr->bit_depth >= 8) + { + png_ptr->usr_channels = 2; + break; + } + + else + { + /* There simply isn't any code in libpng to strip out bits + * from bytes when the components are less than a byte in + * size! + */ + png_app_error(png_ptr, + "png_set_filler is invalid for low bit depth gray output"); + return; + } + + default: + png_app_error(png_ptr, + "png_set_filler: inappropriate color type"); + return; + } +# else + png_app_error(png_ptr, "png_set_filler not supported on write"); + return; +# endif + } + + /* Here on success - libpng supports the operation, set the transformation + * and the flag to say where the filler channel is. + */ png_ptr->transformations |= PNG_FILLER; - png_ptr->filler = (png_uint_16)filler; + if (filler_loc == PNG_FILLER_AFTER) png_ptr->flags |= PNG_FLAG_FILLER_AFTER; + else png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER; - - /* This should probably go in the "do_read_filler" routine. - * I attempted to do that in libpng-1.0.1a but that caused problems - * so I restored it in libpng-1.0.2a - */ - - if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) - { - png_ptr->usr_channels = 4; - } - - /* Also I added this in libpng-1.0.2a (what happens when we expand - * a less-than-8-bit grayscale to GA? */ - - if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8) - { - png_ptr->usr_channels = 2; - } } /* Added to libpng-1.2.7 */ void PNGAPI -png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc) +png_set_add_alpha(png_structrp png_ptr, png_uint_32 filler, int filler_loc) { png_debug(1, "in png_set_add_alpha"); if (png_ptr == NULL) return; + png_set_filler(png_ptr, filler, filler_loc); - png_ptr->transformations |= PNG_ADD_ALPHA; + /* The above may fail to do anything. */ + if (png_ptr->transformations & PNG_FILLER) + png_ptr->transformations |= PNG_ADD_ALPHA; } #endif @@ -160,12 +217,13 @@ png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc) #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) void PNGAPI -png_set_swap_alpha(png_structp png_ptr) +png_set_swap_alpha(png_structrp png_ptr) { png_debug(1, "in png_set_swap_alpha"); if (png_ptr == NULL) return; + png_ptr->transformations |= PNG_SWAP_ALPHA; } #endif @@ -173,24 +231,26 @@ png_set_swap_alpha(png_structp png_ptr) #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) void PNGAPI -png_set_invert_alpha(png_structp png_ptr) +png_set_invert_alpha(png_structrp png_ptr) { png_debug(1, "in png_set_invert_alpha"); if (png_ptr == NULL) return; + png_ptr->transformations |= PNG_INVERT_ALPHA; } #endif #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) void PNGAPI -png_set_invert_mono(png_structp png_ptr) +png_set_invert_mono(png_structrp png_ptr) { png_debug(1, "in png_set_invert_mono"); if (png_ptr == NULL) return; + png_ptr->transformations |= PNG_INVERT_MONO; } @@ -206,8 +266,8 @@ png_do_invert(png_row_infop row_info, png_bytep row) if (row_info->color_type == PNG_COLOR_TYPE_GRAY) { png_bytep rp = row; - png_uint_32 i; - png_uint_32 istop = row_info->rowbytes; + png_size_t i; + png_size_t istop = row_info->rowbytes; for (i = 0; i < istop; i++) { @@ -215,36 +275,41 @@ png_do_invert(png_row_infop row_info, png_bytep row) rp++; } } + else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && row_info->bit_depth == 8) { png_bytep rp = row; - png_uint_32 i; - png_uint_32 istop = row_info->rowbytes; + png_size_t i; + png_size_t istop = row_info->rowbytes; - for (i = 0; i < istop; i+=2) + for (i = 0; i < istop; i += 2) { *rp = (png_byte)(~(*rp)); - rp+=2; + rp += 2; } } + +#ifdef PNG_16BIT_SUPPORTED else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && row_info->bit_depth == 16) { png_bytep rp = row; - png_uint_32 i; - png_uint_32 istop = row_info->rowbytes; + png_size_t i; + png_size_t istop = row_info->rowbytes; - for (i = 0; i < istop; i+=4) + for (i = 0; i < istop; i += 4) { *rp = (png_byte)(~(*rp)); - *(rp+1) = (png_byte)(~(*(rp+1))); - rp+=4; + *(rp + 1) = (png_byte)(~(*(rp + 1))); + rp += 4; } } +#endif } #endif +#ifdef PNG_16BIT_SUPPORTED #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) /* Swaps byte order on 16 bit depth images */ void /* PRIVATE */ @@ -252,8 +317,7 @@ png_do_swap(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_swap"); - if ( - row_info->bit_depth == 16) + if (row_info->bit_depth == 16) { png_bytep rp = row; png_uint_32 i; @@ -268,6 +332,7 @@ png_do_swap(png_row_infop row_info, png_bytep row) } } #endif +#endif #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) static PNG_CONST png_byte onebppswaptable[256] = { @@ -381,19 +446,22 @@ png_do_packswap(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_packswap"); - if ( - row_info->bit_depth < 8) + if (row_info->bit_depth < 8) { - png_bytep rp, end, table; + png_bytep rp; + png_const_bytep end, table; end = row + row_info->rowbytes; if (row_info->bit_depth == 1) - table = (png_bytep)onebppswaptable; + table = onebppswaptable; + else if (row_info->bit_depth == 2) - table = (png_bytep)twobppswaptable; + table = twobppswaptable; + else if (row_info->bit_depth == 4) - table = (png_bytep)fourbppswaptable; + table = fourbppswaptable; + else return; @@ -405,158 +473,119 @@ png_do_packswap(png_row_infop row_info, png_bytep row) #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ defined(PNG_READ_STRIP_ALPHA_SUPPORTED) -/* Remove filler or alpha byte(s) */ +/* Remove a channel - this used to be 'png_do_strip_filler' but it used a + * somewhat weird combination of flags to determine what to do. All the calls + * to png_do_strip_filler are changed in 1.5.2 to call this instead with the + * correct arguments. + * + * The routine isn't general - the channel must be the channel at the start or + * end (not in the middle) of each pixel. + */ void /* PRIVATE */ -png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) +png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start) { - png_debug(1, "in png_do_strip_filler"); + png_bytep sp = row; /* source pointer */ + png_bytep dp = row; /* destination pointer */ + png_bytep ep = row + row_info->rowbytes; /* One beyond end of row */ + /* At the start sp will point to the first byte to copy and dp to where + * it is copied to. ep always points just beyond the end of the row, so + * the loop simply copies (channels-1) channels until sp reaches ep. + * + * at_start: 0 -- convert AG, XG, ARGB, XRGB, AAGG, XXGG, etc. + * nonzero -- convert GA, GX, RGBA, RGBX, GGAA, RRGGBBXX, etc. + */ + + /* GA, GX, XG cases */ + if (row_info->channels == 2) { - png_bytep sp=row; - png_bytep dp=row; - png_uint_32 row_width=row_info->width; - png_uint_32 i; - - if ((row_info->color_type == PNG_COLOR_TYPE_RGB || - (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA && - (flags & PNG_FLAG_STRIP_ALPHA))) && - row_info->channels == 4) + if (row_info->bit_depth == 8) { - if (row_info->bit_depth == 8) - { - /* This converts from RGBX or RGBA to RGB */ - if (flags & PNG_FLAG_FILLER_AFTER) - { - dp+=3; sp+=4; - for (i = 1; i < row_width; i++) - { - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - sp++; - } - } - /* This converts from XRGB or ARGB to RGB */ - else - { - for (i = 0; i < row_width; i++) - { - sp++; - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - } - } - row_info->pixel_depth = 24; - row_info->rowbytes = row_width * 3; - } - else /* if (row_info->bit_depth == 16) */ - { - if (flags & PNG_FLAG_FILLER_AFTER) - { - /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */ - sp += 8; dp += 6; - for (i = 1; i < row_width; i++) - { - /* This could be (although png_memcpy is probably slower): - png_memcpy(dp, sp, 6); - sp += 8; - dp += 6; - */ + if (at_start) /* Skip initial filler */ + ++sp; + else /* Skip initial channel and, for sp, the filler */ + sp += 2, ++dp; - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - sp += 2; - } - } - else - { - /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */ - for (i = 0; i < row_width; i++) - { - /* This could be (although png_memcpy is probably slower): - png_memcpy(dp, sp, 6); - sp += 8; - dp += 6; - */ + /* For a 1 pixel wide image there is nothing to do */ + while (sp < ep) + *dp++ = *sp, sp += 2; - sp+=2; - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - } - } - row_info->pixel_depth = 48; - row_info->rowbytes = row_width * 6; - } - row_info->channels = 3; + row_info->pixel_depth = 8; } - else if ((row_info->color_type == PNG_COLOR_TYPE_GRAY || - (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && - (flags & PNG_FLAG_STRIP_ALPHA))) && - row_info->channels == 2) + + else if (row_info->bit_depth == 16) { - if (row_info->bit_depth == 8) - { - /* This converts from GX or GA to G */ - if (flags & PNG_FLAG_FILLER_AFTER) - { - for (i = 0; i < row_width; i++) - { - *dp++ = *sp++; - sp++; - } - } - /* This converts from XG or AG to G */ - else - { - for (i = 0; i < row_width; i++) - { - sp++; - *dp++ = *sp++; - } - } - row_info->pixel_depth = 8; - row_info->rowbytes = row_width; - } - else /* if (row_info->bit_depth == 16) */ - { - if (flags & PNG_FLAG_FILLER_AFTER) - { - /* This converts from GGXX or GGAA to GG */ - sp += 4; dp += 2; - for (i = 1; i < row_width; i++) - { - *dp++ = *sp++; - *dp++ = *sp++; - sp += 2; - } - } - else - { - /* This converts from XXGG or AAGG to GG */ - for (i = 0; i < row_width; i++) - { - sp += 2; - *dp++ = *sp++; - *dp++ = *sp++; - } - } - row_info->pixel_depth = 16; - row_info->rowbytes = row_width * 2; - } - row_info->channels = 1; + if (at_start) /* Skip initial filler */ + sp += 2; + else /* Skip initial channel and, for sp, the filler */ + sp += 4, dp += 2; + + while (sp < ep) + *dp++ = *sp++, *dp++ = *sp, sp += 3; + + row_info->pixel_depth = 16; } - if (flags & PNG_FLAG_STRIP_ALPHA) - row_info->color_type &= ~PNG_COLOR_MASK_ALPHA; + + else + return; /* bad bit depth */ + + row_info->channels = 1; + + /* Finally fix the color type if it records an alpha channel */ + if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) + row_info->color_type = PNG_COLOR_TYPE_GRAY; } + + /* RGBA, RGBX, XRGB cases */ + else if (row_info->channels == 4) + { + if (row_info->bit_depth == 8) + { + if (at_start) /* Skip initial filler */ + ++sp; + else /* Skip initial channels and, for sp, the filler */ + sp += 4, dp += 3; + + /* Note that the loop adds 3 to dp and 4 to sp each time. */ + while (sp < ep) + *dp++ = *sp++, *dp++ = *sp++, *dp++ = *sp, sp += 2; + + row_info->pixel_depth = 24; + } + + else if (row_info->bit_depth == 16) + { + if (at_start) /* Skip initial filler */ + sp += 2; + else /* Skip initial channels and, for sp, the filler */ + sp += 8, dp += 6; + + while (sp < ep) + { + /* Copy 6 bytes, skip 2 */ + *dp++ = *sp++, *dp++ = *sp++; + *dp++ = *sp++, *dp++ = *sp++; + *dp++ = *sp++, *dp++ = *sp, sp += 3; + } + + row_info->pixel_depth = 48; + } + + else + return; /* bad bit depth */ + + row_info->channels = 3; + + /* Finally fix the color type if it records an alpha channel */ + if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + row_info->color_type = PNG_COLOR_TYPE_RGB; + } + + else + return; /* The filler channel has gone already */ + + /* Fix the rowbytes value. */ + row_info->rowbytes = dp-row; } #endif @@ -567,8 +596,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_bgr"); - if ( - (row_info->color_type & PNG_COLOR_MASK_COLOR)) + if ((row_info->color_type & PNG_COLOR_MASK_COLOR)) { png_uint_32 row_width = row_info->width; if (row_info->bit_depth == 8) @@ -585,6 +613,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row) *(rp + 2) = save; } } + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { png_bytep rp; @@ -598,6 +627,8 @@ png_do_bgr(png_row_infop row_info, png_bytep row) } } } + +#ifdef PNG_16BIT_SUPPORTED else if (row_info->bit_depth == 16) { if (row_info->color_type == PNG_COLOR_TYPE_RGB) @@ -615,6 +646,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row) *(rp + 5) = save; } } + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { png_bytep rp; @@ -631,47 +663,179 @@ png_do_bgr(png_row_infop row_info, png_bytep row) } } } +#endif } } #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */ +#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ + defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) +/* Added at libpng-1.5.10 */ +void /* PRIVATE */ +png_do_check_palette_indexes(png_structrp png_ptr, png_row_infop row_info) +{ + if (png_ptr->num_palette < (1 << row_info->bit_depth) && + png_ptr->num_palette > 0) /* num_palette can be 0 in MNG files */ + { + /* Calculations moved outside switch in an attempt to stop different + * compiler warnings. 'padding' is in *bits* within the last byte, it is + * an 'int' because pixel_depth becomes an 'int' in the expression below, + * and this calculation is used because it avoids warnings that other + * forms produced on either GCC or MSVC. + */ + int padding = (-row_info->pixel_depth * row_info->width) & 7; + png_bytep rp = png_ptr->row_buf + row_info->rowbytes; + + switch (row_info->bit_depth) + { + case 1: + { + /* in this case, all bytes must be 0 so we don't need + * to unpack the pixels except for the rightmost one. + */ + for (; rp > png_ptr->row_buf; rp--) + { + if (*rp >> padding != 0) + png_ptr->num_palette_max = 1; + padding = 0; + } + + break; + } + + case 2: + { + for (; rp > png_ptr->row_buf; rp--) + { + int i = ((*rp >> padding) & 0x03); + + if (i > png_ptr->num_palette_max) + png_ptr->num_palette_max = i; + + i = (((*rp >> padding) >> 2) & 0x03); + + if (i > png_ptr->num_palette_max) + png_ptr->num_palette_max = i; + + i = (((*rp >> padding) >> 4) & 0x03); + + if (i > png_ptr->num_palette_max) + png_ptr->num_palette_max = i; + + i = (((*rp >> padding) >> 6) & 0x03); + + if (i > png_ptr->num_palette_max) + png_ptr->num_palette_max = i; + + padding = 0; + } + + break; + } + + case 4: + { + for (; rp > png_ptr->row_buf; rp--) + { + int i = ((*rp >> padding) & 0x0f); + + if (i > png_ptr->num_palette_max) + png_ptr->num_palette_max = i; + + i = (((*rp >> padding) >> 4) & 0x0f); + + if (i > png_ptr->num_palette_max) + png_ptr->num_palette_max = i; + + padding = 0; + } + + break; + } + + case 8: + { + for (; rp > png_ptr->row_buf; rp--) + { + if (*rp > png_ptr->num_palette_max) + png_ptr->num_palette_max = (int) *rp; + } + + break; + } + + default: + break; + } + } +} +#endif /* PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED */ + #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) +#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED void PNGAPI -png_set_user_transform_info(png_structp png_ptr, png_voidp +png_set_user_transform_info(png_structrp png_ptr, png_voidp user_transform_ptr, int user_transform_depth, int user_transform_channels) { png_debug(1, "in png_set_user_transform_info"); if (png_ptr == NULL) return; -#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED + +#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED + if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && + (png_ptr->flags & PNG_FLAG_ROW_INIT) != 0) + { + png_app_error(png_ptr, + "info change after png_start_read_image or png_read_update_info"); + return; + } +#endif + png_ptr->user_transform_ptr = user_transform_ptr; png_ptr->user_transform_depth = (png_byte)user_transform_depth; png_ptr->user_transform_channels = (png_byte)user_transform_channels; -#else - if (user_transform_ptr || user_transform_depth || user_transform_channels) - png_warning(png_ptr, - "This version of libpng does not support user transform info"); -#endif } +#endif /* This function returns a pointer to the user_transform_ptr associated with * the user transform functions. The application should free any memory * associated with this pointer before png_write_destroy and png_read_destroy * are called. */ +#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED png_voidp PNGAPI -png_get_user_transform_ptr(png_const_structp png_ptr) +png_get_user_transform_ptr(png_const_structrp png_ptr) { if (png_ptr == NULL) return (NULL); -#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED - return ((png_voidp)png_ptr->user_transform_ptr); -#else - return (NULL); -#endif + + return png_ptr->user_transform_ptr; } +#endif + +#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED +png_uint_32 PNGAPI +png_get_current_row_number(png_const_structrp png_ptr) +{ + /* See the comments in png.h - this is the sub-image row when reading and + * interlaced image. + */ + if (png_ptr != NULL) + return png_ptr->row_number; + + return PNG_UINT_32_MAX; /* help the app not to fail silently */ +} + +png_byte PNGAPI +png_get_current_pass_number(png_const_structrp png_ptr) +{ + if (png_ptr != NULL) + return png_ptr->pass; + return 8; /* invalid */ +} +#endif /* PNG_USER_TRANSFORM_INFO_SUPPORTED */ #endif /* PNG_READ_USER_TRANSFORM_SUPPORTED || PNG_WRITE_USER_TRANSFORM_SUPPORTED */ #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ diff --git a/project/jni/png/pngwio.c b/project/jni/png/pngwio.c index 513a71a06..e3289dfe4 100644 --- a/project/jni/png/pngwio.c +++ b/project/jni/png/pngwio.c @@ -1,8 +1,8 @@ /* pngwio.c - functions for data output * - * Last changed in libpng 1.4.0 [January 3, 2010] - * Copyright (c) 1998-2010 Glenn Randers-Pehrson + * Last changed in libpng 1.6.0 [February 14, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -18,11 +18,10 @@ * them at run time with png_set_write_fn(...). */ -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" -#ifdef PNG_WRITE_SUPPORTED #include "pngpriv.h" +#ifdef PNG_WRITE_SUPPORTED + /* Write the data to whatever output you are using. The default routine * writes to a file pointer. Note that this routine sometimes gets called * with very small lengths, so you should implement some kind of simple @@ -31,10 +30,13 @@ */ void /* PRIVATE */ -png_write_data(png_structp png_ptr, png_bytep data, png_size_t length) +png_write_data(png_structrp png_ptr, png_const_bytep data, png_size_t length) { + /* NOTE: write_data_fn must not change the buffer! */ if (png_ptr->write_data_fn != NULL ) - (*(png_ptr->write_data_fn))(png_ptr, data, length); + (*(png_ptr->write_data_fn))(png_ptr, png_constcast(png_bytep,data), + length); + else png_error(png_ptr, "Call to NULL write function"); } @@ -45,70 +47,19 @@ png_write_data(png_structp png_ptr, png_bytep data, png_size_t length) * write_data function and use it at run time with png_set_write_fn(), rather * than changing the library. */ -#ifndef USE_FAR_KEYWORD -void PNGAPI +void PNGCBAPI png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length) { - png_uint_32 check; + png_size_t check; if (png_ptr == NULL) return; + check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr)); + if (check != length) png_error(png_ptr, "Write Error"); } -#else -/* This is the model-independent version. Since the standard I/O library - * can't handle far buffers in the medium and small models, we have to copy - * the data. - */ - -#define NEAR_BUF_SIZE 1024 -#define MIN(a,b) (a <= b ? a : b) - -void PNGAPI -png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length) -{ - png_uint_32 check; - png_byte *near_data; /* Needs to be "png_byte *" instead of "png_bytep" */ - png_FILE_p io_ptr; - - if (png_ptr == NULL) - return; - /* Check if data really is near. If so, use usual code. */ - near_data = (png_byte *)CVT_PTR_NOCHECK(data); - io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr); - if ((png_bytep)near_data == data) - { - check = fwrite(near_data, 1, length, io_ptr); - } - else - { - png_byte buf[NEAR_BUF_SIZE]; - png_size_t written, remaining, err; - check = 0; - remaining = length; - do - { - written = MIN(NEAR_BUF_SIZE, remaining); - png_memcpy(buf, data, written); /* Copy far buffer to near buffer */ - err = fwrite(buf, 1, written, io_ptr); - if (err != written) - break; - - else - check += err; - - data += written; - remaining -= written; - } - while (remaining != 0); - } - if (check != length) - png_error(png_ptr, "Write Error"); -} - -#endif #endif /* This function is called to output any data pending writing (normally @@ -117,23 +68,25 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length) */ #ifdef PNG_WRITE_FLUSH_SUPPORTED void /* PRIVATE */ -png_flush(png_structp png_ptr) +png_flush(png_structrp png_ptr) { if (png_ptr->output_flush_fn != NULL) (*(png_ptr->output_flush_fn))(png_ptr); } -#ifdef PNG_STDIO_SUPPORTED -void PNGAPI +# ifdef PNG_STDIO_SUPPORTED +void PNGCBAPI png_default_flush(png_structp png_ptr) { png_FILE_p io_ptr; + if (png_ptr == NULL) return; - io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr)); + + io_ptr = png_voidcast(png_FILE_p, (png_ptr->io_ptr)); fflush(io_ptr); } -#endif +# endif #endif /* This function allows the application to supply new output functions for @@ -166,8 +119,8 @@ png_default_flush(png_structp png_ptr) * *FILE structure. */ void PNGAPI -png_set_write_fn(png_structp png_ptr, png_voidp io_ptr, - png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn) +png_set_write_fn(png_structrp png_ptr, png_voidp io_ptr, + png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn) { if (png_ptr == NULL) return; @@ -185,57 +138,27 @@ png_set_write_fn(png_structp png_ptr, png_voidp io_ptr, #endif #ifdef PNG_WRITE_FLUSH_SUPPORTED -#ifdef PNG_STDIO_SUPPORTED +# ifdef PNG_STDIO_SUPPORTED + if (output_flush_fn != NULL) png_ptr->output_flush_fn = output_flush_fn; else png_ptr->output_flush_fn = png_default_flush; -#else + +# else png_ptr->output_flush_fn = output_flush_fn; -#endif +# endif #endif /* PNG_WRITE_FLUSH_SUPPORTED */ /* It is an error to read while writing a png file */ if (png_ptr->read_data_fn != NULL) { png_ptr->read_data_fn = NULL; + png_warning(png_ptr, - "Attempted to set both read_data_fn and write_data_fn in"); - png_warning(png_ptr, - "the same structure. Resetting read_data_fn to NULL"); + "Can't set both read_data_fn and write_data_fn in the" + " same structure"); } } - -#ifdef USE_FAR_KEYWORD -#ifdef _MSC_VER -void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check) -{ - void *near_ptr; - void FAR *far_ptr; - FP_OFF(near_ptr) = FP_OFF(ptr); - far_ptr = (void FAR *)near_ptr; - - if (check != 0) - if (FP_SEG(ptr) != FP_SEG(far_ptr)) - png_error(png_ptr, "segment lost in conversion"); - - return(near_ptr); -} -# else -void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check) -{ - void *near_ptr; - void FAR *far_ptr; - near_ptr = (void FAR *)ptr; - far_ptr = (void FAR *)near_ptr; - - if (check != 0) - if (far_ptr != ptr) - png_error(png_ptr, "segment lost in conversion"); - - return(near_ptr); -} -# endif -# endif #endif /* PNG_WRITE_SUPPORTED */ diff --git a/project/jni/png/pngwrite.c b/project/jni/png/pngwrite.c index 62d1166da..b71a3d345 100644 --- a/project/jni/png/pngwrite.c +++ b/project/jni/png/pngwrite.c @@ -1,8 +1,8 @@ /* pngwrite.c - general routines to write a PNG file * - * Last changed in libpng 1.4.6 [January 14, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.2 [April 25, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -11,11 +11,65 @@ * and license in png.h */ -/* Get internal access to png.h */ -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" -#ifdef PNG_WRITE_SUPPORTED #include "pngpriv.h" +#if defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) && defined(PNG_STDIO_SUPPORTED) +# include +#endif + +#ifdef PNG_WRITE_SUPPORTED + +#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED +/* Write out all the unknown chunks for the current given location */ +static void +write_unknown_chunks(png_structrp png_ptr, png_const_inforp info_ptr, + unsigned int where) +{ + if (info_ptr->unknown_chunks_num) + { + png_const_unknown_chunkp up; + + png_debug(5, "writing extra chunks"); + + for (up = info_ptr->unknown_chunks; + up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; + ++up) + if (up->location & where) + { + /* If per-chunk unknown chunk handling is enabled use it, otherwise + * just write the chunks the application has set. + */ +#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED + int keep = png_handle_as_unknown(png_ptr, up->name); + + /* NOTE: this code is radically different from the read side in the + * matter of handling an ancillary unknown chunk. In the read side + * the default behavior is to discard it, in the code below the default + * behavior is to write it. Critical chunks are, however, only + * written if explicitly listed or if the default is set to write all + * unknown chunks. + * + * The default handling is also slightly weird - it is not possible to + * stop the writing of all unsafe-to-copy chunks! + * + * TODO: REVIEW: this would seem to be a bug. + */ + if (keep != PNG_HANDLE_CHUNK_NEVER && + ((up->name[3] & 0x20) /* safe-to-copy overrides everything */ || + keep == PNG_HANDLE_CHUNK_ALWAYS || + (keep == PNG_HANDLE_CHUNK_AS_DEFAULT && + png_ptr->unknown_default == PNG_HANDLE_CHUNK_ALWAYS))) +#endif + { + /* TODO: review, what is wrong with a zero length unknown chunk? */ + if (up->size == 0) + png_warning(png_ptr, "Writing zero-length unknown chunk"); + + png_write_chunk(png_ptr, up->name, up->data, up->size); + } + } + } +} +#endif /* PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED */ /* Writes all the PNG information. This is the suggested way to use the * library. If you have a new chunk to add, make a function to write it, @@ -27,112 +81,114 @@ * them in png_write_end(), and compressing them. */ void PNGAPI -png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr) +png_write_info_before_PLTE(png_structrp png_ptr, png_const_inforp info_ptr) { png_debug(1, "in png_write_info_before_PLTE"); if (png_ptr == NULL || info_ptr == NULL) return; + if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE)) { /* Write PNG signature */ png_write_sig(png_ptr); + #ifdef PNG_MNG_FEATURES_SUPPORTED if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) && \ - (png_ptr->mng_features_permitted)) + (png_ptr->mng_features_permitted)) { png_warning(png_ptr, "MNG features are not allowed in a PNG datastream"); png_ptr->mng_features_permitted = 0; } #endif + /* Write IHDR information. */ png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height, - info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type, - info_ptr->filter_type, + info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type, + info_ptr->filter_type, #ifdef PNG_WRITE_INTERLACING_SUPPORTED - info_ptr->interlace_type); + info_ptr->interlace_type #else - 0); + 0 #endif + ); + /* The rest of these check to see if the valid field has the appropriate * flag set, and if it does, writes the chunk. + * + * 1.6.0: COLORSPACE support controls the writing of these chunks too, and + * the chunks will be written if the WRITE routine is there and information + * is available in the COLORSPACE. (See png_colorspace_sync_info in png.c + * for where the valid flags get set.) + * + * Under certain circumstances the colorspace can be invalidated without + * syncing the info_struct 'valid' flags; this happens if libpng detects and + * error and calls png_error while the color space is being set, yet the + * application continues writing the PNG. So check the 'invalid' flag here + * too. */ -#ifdef PNG_WRITE_gAMA_SUPPORTED - if (info_ptr->valid & PNG_INFO_gAMA) - { -# ifdef PNG_FLOATING_POINT_SUPPORTED - png_write_gAMA(png_ptr, info_ptr->gamma); -#else -#ifdef PNG_FIXED_POINT_SUPPORTED - png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma); +#ifdef PNG_GAMMA_SUPPORTED +# ifdef PNG_WRITE_gAMA_SUPPORTED + if (!(info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) && + (info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_gAMA) && + (info_ptr->valid & PNG_INFO_gAMA)) + png_write_gAMA_fixed(png_ptr, info_ptr->colorspace.gamma); # endif #endif - } -#endif -#ifdef PNG_WRITE_sRGB_SUPPORTED - if (info_ptr->valid & PNG_INFO_sRGB) - png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent); -#endif -#ifdef PNG_WRITE_iCCP_SUPPORTED - if (info_ptr->valid & PNG_INFO_iCCP) - png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE, - info_ptr->iccp_profile, (int)info_ptr->iccp_proflen); -#endif + +#ifdef PNG_COLORSPACE_SUPPORTED + /* Write only one of sRGB or an ICC profile. If a profile was supplied + * and it matches one of the known sRGB ones issue a warning. + */ +# ifdef PNG_WRITE_iCCP_SUPPORTED + if (!(info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) && + (info_ptr->valid & PNG_INFO_iCCP)) + { +# ifdef PNG_WRITE_sRGB_SUPPORTED + if (info_ptr->valid & PNG_INFO_sRGB) + png_app_warning(png_ptr, + "profile matches sRGB but writing iCCP instead"); +# endif + + png_write_iCCP(png_ptr, info_ptr->iccp_name, + info_ptr->iccp_profile); + } +# ifdef PNG_WRITE_sRGB_SUPPORTED + else +# endif +# endif + +# ifdef PNG_WRITE_sRGB_SUPPORTED + if (!(info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) && + (info_ptr->valid & PNG_INFO_sRGB)) + png_write_sRGB(png_ptr, info_ptr->colorspace.rendering_intent); +# endif /* WRITE_sRGB */ +#endif /* COLORSPACE */ + #ifdef PNG_WRITE_sBIT_SUPPORTED if (info_ptr->valid & PNG_INFO_sBIT) png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type); #endif -#ifdef PNG_WRITE_cHRM_SUPPORTED - if (info_ptr->valid & PNG_INFO_cHRM) - { -#ifdef PNG_FLOATING_POINT_SUPPORTED - png_write_cHRM(png_ptr, - info_ptr->x_white, info_ptr->y_white, - info_ptr->x_red, info_ptr->y_red, - info_ptr->x_green, info_ptr->y_green, - info_ptr->x_blue, info_ptr->y_blue); -#else -# ifdef PNG_FIXED_POINT_SUPPORTED - png_write_cHRM_fixed(png_ptr, - info_ptr->int_x_white, info_ptr->int_y_white, - info_ptr->int_x_red, info_ptr->int_y_red, - info_ptr->int_x_green, info_ptr->int_y_green, - info_ptr->int_x_blue, info_ptr->int_y_blue); + +#ifdef PNG_COLORSPACE_SUPPORTED +# ifdef PNG_WRITE_cHRM_SUPPORTED + if (!(info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) && + (info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_cHRM) && + (info_ptr->valid & PNG_INFO_cHRM)) + png_write_cHRM_fixed(png_ptr, &info_ptr->colorspace.end_points_xy); # endif #endif - } -#endif + #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED - if (info_ptr->unknown_chunks_num) - { - png_unknown_chunk *up; - - png_debug(5, "writing extra chunks"); - - for (up = info_ptr->unknown_chunks; - up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; - up++) - { - int keep = png_handle_as_unknown(png_ptr, up->name); - if (keep != PNG_HANDLE_CHUNK_NEVER && - up->location && !(up->location & PNG_HAVE_PLTE) && - !(up->location & PNG_HAVE_IDAT) && - ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || - (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) - { - if (up->size == 0) - png_warning(png_ptr, "Writing zero-length unknown chunk"); - png_write_chunk(png_ptr, up->name, up->data, up->size); - } - } - } + write_unknown_chunks(png_ptr, info_ptr, PNG_HAVE_IHDR); #endif + png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE; } } void PNGAPI -png_write_info(png_structp png_ptr, png_infop info_ptr) +png_write_info(png_structrp png_ptr, png_const_inforp info_ptr) { #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) int i; @@ -147,7 +203,8 @@ png_write_info(png_structp png_ptr, png_infop info_ptr) if (info_ptr->valid & PNG_INFO_PLTE) png_write_PLTE(png_ptr, info_ptr->palette, - (png_uint_32)info_ptr->num_palette); + (png_uint_32)info_ptr->num_palette); + else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) png_error(png_ptr, "Valid palette required for paletted images"); @@ -157,59 +214,51 @@ png_write_info(png_structp png_ptr, png_infop info_ptr) #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED /* Invert the alpha channel (in tRNS) */ if ((png_ptr->transformations & PNG_INVERT_ALPHA) && - info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { int j; for (j = 0; j<(int)info_ptr->num_trans; j++) - info_ptr->trans_alpha[j] = (png_byte)(255 - info_ptr->trans_alpha[j]); + info_ptr->trans_alpha[j] = + (png_byte)(255 - info_ptr->trans_alpha[j]); } #endif png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color), - info_ptr->num_trans, info_ptr->color_type); + info_ptr->num_trans, info_ptr->color_type); } #endif #ifdef PNG_WRITE_bKGD_SUPPORTED if (info_ptr->valid & PNG_INFO_bKGD) png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type); #endif + #ifdef PNG_WRITE_hIST_SUPPORTED if (info_ptr->valid & PNG_INFO_hIST) png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette); #endif + #ifdef PNG_WRITE_oFFs_SUPPORTED if (info_ptr->valid & PNG_INFO_oFFs) png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset, - info_ptr->offset_unit_type); + info_ptr->offset_unit_type); #endif + #ifdef PNG_WRITE_pCAL_SUPPORTED if (info_ptr->valid & PNG_INFO_pCAL) png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0, - info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams, - info_ptr->pcal_units, info_ptr->pcal_params); + info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams, + info_ptr->pcal_units, info_ptr->pcal_params); #endif -#ifdef PNG_sCAL_SUPPORTED - if (info_ptr->valid & PNG_INFO_sCAL) #ifdef PNG_WRITE_sCAL_SUPPORTED -#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED) - png_write_sCAL(png_ptr, (int)info_ptr->scal_unit, - info_ptr->scal_pixel_width, info_ptr->scal_pixel_height); -#else /* !FLOATING_POINT */ -#ifdef PNG_FIXED_POINT_SUPPORTED + if (info_ptr->valid & PNG_INFO_sCAL) png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit, info_ptr->scal_s_width, info_ptr->scal_s_height); -#endif /* FIXED_POINT */ -#endif /* FLOATING_POINT */ -#else /* !WRITE_sCAL */ - png_warning(png_ptr, - "png_write_sCAL not supported; sCAL chunk not written"); -#endif /* WRITE_sCAL */ #endif /* sCAL */ #ifdef PNG_WRITE_pHYs_SUPPORTED if (info_ptr->valid & PNG_INFO_pHYs) png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit, - info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type); + info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type); #endif /* pHYs */ #ifdef PNG_WRITE_tIME_SUPPORTED @@ -222,8 +271,8 @@ png_write_info(png_structp png_ptr, png_infop info_ptr) #ifdef PNG_WRITE_sPLT_SUPPORTED if (info_ptr->valid & PNG_INFO_sPLT) - for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) - png_write_sPLT(png_ptr, info_ptr->splt_palettes + i); + for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) + png_write_sPLT(png_ptr, info_ptr->splt_palettes + i); #endif /* sPLT */ #ifdef PNG_WRITE_TEXT_SUPPORTED @@ -231,45 +280,47 @@ png_write_info(png_structp png_ptr, png_infop info_ptr) for (i = 0; i < info_ptr->num_text; i++) { png_debug2(2, "Writing header text chunk %d, type %d", i, - info_ptr->text[i].compression); + info_ptr->text[i].compression); /* An internationalized chunk? */ if (info_ptr->text[i].compression > 0) { #ifdef PNG_WRITE_iTXt_SUPPORTED - /* Write international chunk */ - png_write_iTXt(png_ptr, - info_ptr->text[i].compression, - info_ptr->text[i].key, - info_ptr->text[i].lang, - info_ptr->text[i].lang_key, - info_ptr->text[i].text); + /* Write international chunk */ + png_write_iTXt(png_ptr, + info_ptr->text[i].compression, + info_ptr->text[i].key, + info_ptr->text[i].lang, + info_ptr->text[i].lang_key, + info_ptr->text[i].text); #else png_warning(png_ptr, "Unable to write international text"); #endif /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; } + /* If we want a compressed text chunk */ else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt) { #ifdef PNG_WRITE_zTXt_SUPPORTED /* Write compressed chunk */ png_write_zTXt(png_ptr, info_ptr->text[i].key, - info_ptr->text[i].text, 0, - info_ptr->text[i].compression); + info_ptr->text[i].text, 0, + info_ptr->text[i].compression); #else png_warning(png_ptr, "Unable to write compressed text"); #endif /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; } + else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) { #ifdef PNG_WRITE_tEXt_SUPPORTED /* Write uncompressed chunk */ png_write_tEXt(png_ptr, info_ptr->text[i].key, - info_ptr->text[i].text, - 0); + info_ptr->text[i].text, + 0); /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; #else @@ -281,27 +332,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr) #endif /* tEXt */ #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED - if (info_ptr->unknown_chunks_num) - { - png_unknown_chunk *up; - - png_debug(5, "writing extra chunks"); - - for (up = info_ptr->unknown_chunks; - up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; - up++) - { - int keep = png_handle_as_unknown(png_ptr, up->name); - if (keep != PNG_HANDLE_CHUNK_NEVER && - up->location && (up->location & PNG_HAVE_PLTE) && - !(up->location & PNG_HAVE_IDAT) && - ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || - (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) - { - png_write_chunk(png_ptr, up->name, up->data, up->size); - } - } - } + write_unknown_chunks(png_ptr, info_ptr, PNG_HAVE_PLTE); #endif } @@ -311,15 +342,21 @@ png_write_info(png_structp png_ptr, png_infop info_ptr) * comments, I suggest writing them here, and compressing them. */ void PNGAPI -png_write_end(png_structp png_ptr, png_infop info_ptr) +png_write_end(png_structrp png_ptr, png_inforp info_ptr) { png_debug(1, "in png_write_end"); if (png_ptr == NULL) return; + if (!(png_ptr->mode & PNG_HAVE_IDAT)) png_error(png_ptr, "No IDATs written into file"); +#ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED + if (png_ptr->num_palette_max > png_ptr->num_palette) + png_benign_error(png_ptr, "Wrote palette index exceeding num_palette"); +#endif + /* See if user wants us to write information chunks */ if (info_ptr != NULL) { @@ -329,8 +366,9 @@ png_write_end(png_structp png_ptr, png_infop info_ptr) #ifdef PNG_WRITE_tIME_SUPPORTED /* Check to see if user has supplied a time chunk */ if ((info_ptr->valid & PNG_INFO_tIME) && - !(png_ptr->mode & PNG_WROTE_tIME)) + !(png_ptr->mode & PNG_WROTE_tIME)) png_write_tIME(png_ptr, &(info_ptr->mod_time)); + #endif #ifdef PNG_WRITE_TEXT_SUPPORTED /* Loop through comment chunks */ @@ -344,36 +382,38 @@ png_write_end(png_structp png_ptr, png_infop info_ptr) #ifdef PNG_WRITE_iTXt_SUPPORTED /* Write international chunk */ png_write_iTXt(png_ptr, - info_ptr->text[i].compression, - info_ptr->text[i].key, - info_ptr->text[i].lang, - info_ptr->text[i].lang_key, - info_ptr->text[i].text); + info_ptr->text[i].compression, + info_ptr->text[i].key, + info_ptr->text[i].lang, + info_ptr->text[i].lang_key, + info_ptr->text[i].text); #else png_warning(png_ptr, "Unable to write international text"); #endif /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; } + else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt) { #ifdef PNG_WRITE_zTXt_SUPPORTED /* Write compressed chunk */ png_write_zTXt(png_ptr, info_ptr->text[i].key, - info_ptr->text[i].text, 0, - info_ptr->text[i].compression); + info_ptr->text[i].text, 0, + info_ptr->text[i].compression); #else png_warning(png_ptr, "Unable to write compressed text"); #endif /* Mark this chunk as written */ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; } + else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) { #ifdef PNG_WRITE_tEXt_SUPPORTED /* Write uncompressed chunk */ png_write_tEXt(png_ptr, info_ptr->text[i].key, - info_ptr->text[i].text, 0); + info_ptr->text[i].text, 0); #else png_warning(png_ptr, "Unable to write uncompressed text"); #endif @@ -384,26 +424,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr) } #endif #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED - if (info_ptr->unknown_chunks_num) - { - png_unknown_chunk *up; - - png_debug(5, "writing extra chunks"); - - for (up = info_ptr->unknown_chunks; - up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; - up++) - { - int keep = png_handle_as_unknown(png_ptr, up->name); - if (keep != PNG_HANDLE_CHUNK_NEVER && - up->location && (up->location & PNG_AFTER_IDAT) && - ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || - (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) - { - png_write_chunk(png_ptr, up->name, up->data, up->size); - } - } - } + write_unknown_chunks(png_ptr, info_ptr, PNG_AFTER_IDAT); #endif } @@ -426,9 +447,8 @@ png_write_end(png_structp png_ptr, png_infop info_ptr) } #ifdef PNG_CONVERT_tIME_SUPPORTED -/* "tm" structure is not supported on WindowsCE */ void PNGAPI -png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime) +png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm * ttime) { png_debug(1, "in png_convert_from_struct_tm"); @@ -453,146 +473,79 @@ png_convert_from_time_t(png_timep ptime, time_t ttime) #endif /* Initialize png_ptr structure, and allocate any memory needed */ -png_structp PNGAPI -png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr, - png_error_ptr error_fn, png_error_ptr warn_fn) +PNG_FUNCTION(png_structp,PNGAPI +png_create_write_struct,(png_const_charp user_png_ver, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED) { -#ifdef PNG_USER_MEM_SUPPORTED - return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn, - warn_fn, NULL, NULL, NULL)); +#ifndef PNG_USER_MEM_SUPPORTED + png_structrp png_ptr = png_create_png_struct(user_png_ver, error_ptr, + error_fn, warn_fn, NULL, NULL, NULL); +#else + return png_create_write_struct_2(user_png_ver, error_ptr, error_fn, + warn_fn, NULL, NULL, NULL); } /* Alternate initialize png_ptr structure, and allocate any memory needed */ -png_structp PNGAPI -png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, - png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, - png_malloc_ptr malloc_fn, png_free_ptr free_fn) +PNG_FUNCTION(png_structp,PNGAPI +png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, + png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED) { + png_structrp png_ptr = png_create_png_struct(user_png_ver, error_ptr, + error_fn, warn_fn, mem_ptr, malloc_fn, free_fn); #endif /* PNG_USER_MEM_SUPPORTED */ - volatile int png_cleanup_needed = 0; -#ifdef PNG_SETJMP_SUPPORTED - volatile -#endif - png_structp png_ptr; -#ifdef PNG_SETJMP_SUPPORTED -#ifdef USE_FAR_KEYWORD - jmp_buf jmpbuf; -#endif -#endif - int i; - - png_debug(1, "in png_create_write_struct"); - -#ifdef PNG_USER_MEM_SUPPORTED - png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, - (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr); -#else - png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); -#endif /* PNG_USER_MEM_SUPPORTED */ - if (png_ptr == NULL) - return (NULL); - - /* Added at libpng-1.2.6 */ -#ifdef PNG_SET_USER_LIMITS_SUPPORTED - png_ptr->user_width_max = PNG_USER_WIDTH_MAX; - png_ptr->user_height_max = PNG_USER_HEIGHT_MAX; -#endif - -#ifdef PNG_SETJMP_SUPPORTED -/* Applications that neglect to set up their own setjmp() and then - encounter a png_error() will longjmp here. Since the jmpbuf is - then meaningless we abort instead of returning. */ -#ifdef USE_FAR_KEYWORD - if (setjmp(jmpbuf)) -#else - if (setjmp(png_jmpbuf(png_ptr))) /* sets longjmp to match setjmp */ -#endif -#ifdef USE_FAR_KEYWORD - png_memcpy(png_jmpbuf(png_ptr), jmpbuf, png_sizeof(jmp_buf)); -#endif - PNG_ABORT(); -#endif - -#ifdef PNG_USER_MEM_SUPPORTED - png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); -#endif /* PNG_USER_MEM_SUPPORTED */ - png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); - - if (user_png_ver) + if (png_ptr != NULL) { - i = 0; - do - { - if (user_png_ver[i] != png_libpng_ver[i]) - png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; - } while (png_libpng_ver[i++]); + /* Set the zlib control values to defaults; they can be overridden by the + * application after the struct has been created. + */ + png_ptr->zbuffer_size = PNG_ZBUF_SIZE; + + /* The 'zlib_strategy' setting is irrelevant because png_default_claim in + * pngwutil.c defaults it according to whether or not filters will be + * used, and ignores this setting. + */ + png_ptr->zlib_strategy = PNG_Z_DEFAULT_STRATEGY; + png_ptr->zlib_level = PNG_Z_DEFAULT_COMPRESSION; + png_ptr->zlib_mem_level = 8; + png_ptr->zlib_window_bits = 15; + png_ptr->zlib_method = 8; + +#ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED + png_ptr->zlib_text_strategy = PNG_TEXT_Z_DEFAULT_STRATEGY; + png_ptr->zlib_text_level = PNG_TEXT_Z_DEFAULT_COMPRESSION; + png_ptr->zlib_text_mem_level = 8; + png_ptr->zlib_text_window_bits = 15; + png_ptr->zlib_text_method = 8; +#endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */ + + /* This is a highly dubious configuration option; by default it is off, + * but it may be appropriate for private builds that are testing + * extensions not conformant to the current specification, or of + * applications that must not fail to write at all costs! + */ +#ifdef PNG_BENIGN_WRITE_ERRORS_SUPPORTED + png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN; + /* In stable builds only warn if an application error can be completely + * handled. + */ +#endif + + /* App warnings are warnings in release (or release candidate) builds but + * are errors during development. + */ +#if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC + png_ptr->flags |= PNG_FLAG_APP_WARNINGS_WARN; +#endif + + /* TODO: delay this, it can be done in png_init_io() (if the app doesn't + * do it itself) avoiding setting the default function if it is not + * required. + */ + png_set_write_fn(png_ptr, NULL, NULL, NULL); } - if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) - { - /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so - * we must recompile any applications that use any older library version. - * For versions after libpng 1.0, we will be compatible, so we need - * only check the first digit. - */ - if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || - (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || - (user_png_ver[0] == '0' && user_png_ver[2] < '9')) - { -#ifdef PNG_STDIO_SUPPORTED - char msg[80]; - if (user_png_ver) - { - png_snprintf(msg, 80, - "Application was compiled with png.h from libpng-%.20s", - user_png_ver); - png_warning(png_ptr, msg); - } - png_snprintf(msg, 80, - "Application is running with png.c from libpng-%.20s", - png_libpng_ver); - png_warning(png_ptr, msg); -#endif -#ifdef PNG_ERROR_NUMBERS_SUPPORTED - png_ptr->flags = 0; -#endif - png_warning(png_ptr, - "Incompatible libpng version in application and library"); - png_cleanup_needed = 1; - } - } - - /* Initialize zbuf - compression buffer */ - png_ptr->zbuf_size = PNG_ZBUF_SIZE; - if (!png_cleanup_needed) - { - png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr, - png_ptr->zbuf_size); - if (png_ptr->zbuf == NULL) - png_cleanup_needed = 1; - } - if (png_cleanup_needed) - { - /* Clean up PNG structure and deallocate any memory. */ - png_free(png_ptr, png_ptr->zbuf); - png_ptr->zbuf = NULL; -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)png_ptr, - (png_free_ptr)free_fn, (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)png_ptr); -#endif - return (NULL); - } - - png_set_write_fn(png_ptr, NULL, NULL, NULL); - -#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED - png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT, - 1, NULL, NULL); -#endif - - return (png_ptr); + return png_ptr; } @@ -602,8 +555,8 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, * "write" the image seven times. */ void PNGAPI -png_write_rows(png_structp png_ptr, png_bytepp row, - png_uint_32 num_rows) +png_write_rows(png_structrp png_ptr, png_bytepp row, + png_uint_32 num_rows) { png_uint_32 i; /* row counter */ png_bytepp rp; /* row pointer */ @@ -624,7 +577,7 @@ png_write_rows(png_structp png_ptr, png_bytepp row, * if you are writing an interlaced image. */ void PNGAPI -png_write_image(png_structp png_ptr, png_bytepp image) +png_write_image(png_structrp png_ptr, png_bytepp image) { png_uint_32 i; /* row index */ int pass, num_pass; /* pass variables */ @@ -656,13 +609,16 @@ png_write_image(png_structp png_ptr, png_bytepp image) /* Called by user to write a row of image data */ void PNGAPI -png_write_row(png_structp png_ptr, png_bytep row) +png_write_row(png_structrp png_ptr, png_const_bytep row) { + /* 1.5.6: moved from png_struct to be a local structure: */ + png_row_info row_info; + if (png_ptr == NULL) return; - png_debug2(1, "in png_write_row (row %lu, pass %d)", - (unsigned long)png_ptr->row_number, png_ptr->pass); + png_debug2(1, "in png_write_row (row %u, pass %d)", + png_ptr->row_number, png_ptr->pass); /* Initialize transformations and other stuff if first time */ if (png_ptr->row_number == 0 && png_ptr->pass == 0) @@ -670,13 +626,14 @@ png_write_row(png_structp png_ptr, png_bytep row) /* Make sure we wrote the header info */ if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE)) png_error(png_ptr, - "png_write_info was never called before png_write_row"); + "png_write_info was never called before png_write_row"); /* Check for transforms that have been set but were defined out */ #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED) if (png_ptr->transformations & PNG_INVERT_MONO) png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined"); #endif + #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED) if (png_ptr->transformations & PNG_FILLER) png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined"); @@ -687,18 +644,22 @@ png_write_row(png_structp png_ptr, png_bytep row) png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined"); #endif + #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED) if (png_ptr->transformations & PNG_PACK) png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined"); #endif + #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED) if (png_ptr->transformations & PNG_SHIFT) png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined"); #endif + #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED) if (png_ptr->transformations & PNG_BGR) png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined"); #endif + #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED) if (png_ptr->transformations & PNG_SWAP_BYTES) png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined"); @@ -720,6 +681,7 @@ png_write_row(png_structp png_ptr, png_bytep row) return; } break; + case 1: if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) { @@ -727,6 +689,7 @@ png_write_row(png_structp png_ptr, png_bytep row) return; } break; + case 2: if ((png_ptr->row_number & 0x07) != 4) { @@ -734,6 +697,7 @@ png_write_row(png_structp png_ptr, png_bytep row) return; } break; + case 3: if ((png_ptr->row_number & 0x03) || png_ptr->width < 3) { @@ -741,6 +705,7 @@ png_write_row(png_structp png_ptr, png_bytep row) return; } break; + case 4: if ((png_ptr->row_number & 0x03) != 2) { @@ -748,6 +713,7 @@ png_write_row(png_structp png_ptr, png_bytep row) return; } break; + case 5: if ((png_ptr->row_number & 0x01) || png_ptr->width < 2) { @@ -755,6 +721,7 @@ png_write_row(png_structp png_ptr, png_bytep row) return; } break; + case 6: if (!(png_ptr->row_number & 0x01)) { @@ -762,41 +729,39 @@ png_write_row(png_structp png_ptr, png_bytep row) return; } break; + + default: /* error: ignore it */ + break; } } #endif /* Set up row info for transformations */ - png_ptr->row_info.color_type = png_ptr->color_type; - png_ptr->row_info.width = png_ptr->usr_width; - png_ptr->row_info.channels = png_ptr->usr_channels; - png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth; - png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth * - png_ptr->row_info.channels); + row_info.color_type = png_ptr->color_type; + row_info.width = png_ptr->usr_width; + row_info.channels = png_ptr->usr_channels; + row_info.bit_depth = png_ptr->usr_bit_depth; + row_info.pixel_depth = (png_byte)(row_info.bit_depth * row_info.channels); + row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width); - png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, - png_ptr->row_info.width); - - png_debug1(3, "row_info->color_type = %d", png_ptr->row_info.color_type); - png_debug1(3, "row_info->width = %lu", - (unsigned long)png_ptr->row_info.width); - png_debug1(3, "row_info->channels = %d", png_ptr->row_info.channels); - png_debug1(3, "row_info->bit_depth = %d", png_ptr->row_info.bit_depth); - png_debug1(3, "row_info->pixel_depth = %d", png_ptr->row_info.pixel_depth); - png_debug1(3, "row_info->rowbytes = %lu", png_ptr->row_info.rowbytes); + png_debug1(3, "row_info->color_type = %d", row_info.color_type); + png_debug1(3, "row_info->width = %u", row_info.width); + png_debug1(3, "row_info->channels = %d", row_info.channels); + png_debug1(3, "row_info->bit_depth = %d", row_info.bit_depth); + png_debug1(3, "row_info->pixel_depth = %d", row_info.pixel_depth); + png_debug1(3, "row_info->rowbytes = %lu", (unsigned long)row_info.rowbytes); /* Copy user's row into buffer, leaving room for filter byte. */ - png_memcpy(png_ptr->row_buf + 1, row, png_ptr->row_info.rowbytes); + memcpy(png_ptr->row_buf + 1, row, row_info.rowbytes); #ifdef PNG_WRITE_INTERLACING_SUPPORTED /* Handle interlacing */ if (png_ptr->interlaced && png_ptr->pass < 6 && - (png_ptr->transformations & PNG_INTERLACE)) + (png_ptr->transformations & PNG_INTERLACE)) { - png_do_write_interlace(&(png_ptr->row_info), - png_ptr->row_buf + 1, png_ptr->pass); + png_do_write_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass); /* This should always get caught above, but still ... */ - if (!(png_ptr->row_info.width)) + if (!(row_info.width)) { png_write_finish_row(png_ptr); return; @@ -804,9 +769,18 @@ png_write_row(png_structp png_ptr, png_bytep row) } #endif +#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED /* Handle other transformations */ if (png_ptr->transformations) - png_do_write_transformations(png_ptr); + png_do_write_transformations(png_ptr, &row_info); +#endif + + /* At this point the row_info pixel depth must match the 'transformed' depth, + * which is also the output depth. + */ + if (row_info.pixel_depth != png_ptr->pixel_depth || + row_info.pixel_depth != png_ptr->transformed_pixel_depth) + png_error(png_ptr, "internal write transform logic error"); #ifdef PNG_MNG_FEATURES_SUPPORTED /* Write filter_method 64 (intrapixel differencing) only if @@ -819,15 +793,23 @@ png_write_row(png_structp png_ptr, png_bytep row) * 5. The color_type is RGB or RGBA */ if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && - (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) + (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) { /* Intrapixel differencing */ - png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_write_intrapixel(&row_info, png_ptr->row_buf + 1); } #endif +/* Added at libpng-1.5.10 */ +#ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED + /* Check for out-of-range palette index */ + if (row_info.color_type == PNG_COLOR_TYPE_PALETTE && + png_ptr->num_palette_max >= 0) + png_do_check_palette_indexes(png_ptr, &row_info); +#endif + /* Find a filter if necessary, filter the row and write it out. */ - png_write_find_filter(png_ptr, &(png_ptr->row_info)); + png_write_find_filter(png_ptr, &row_info); if (png_ptr->write_row_fn != NULL) (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); @@ -836,163 +818,51 @@ png_write_row(png_structp png_ptr, png_bytep row) #ifdef PNG_WRITE_FLUSH_SUPPORTED /* Set the automatic flush interval or 0 to turn flushing off */ void PNGAPI -png_set_flush(png_structp png_ptr, int nrows) +png_set_flush(png_structrp png_ptr, int nrows) { png_debug(1, "in png_set_flush"); if (png_ptr == NULL) return; + png_ptr->flush_dist = (nrows < 0 ? 0 : nrows); } /* Flush the current output buffers now */ void PNGAPI -png_write_flush(png_structp png_ptr) +png_write_flush(png_structrp png_ptr) { - int wrote_IDAT; - png_debug(1, "in png_write_flush"); if (png_ptr == NULL) return; + /* We have already written out all of the data */ if (png_ptr->row_number >= png_ptr->num_rows) return; - do - { - int ret; - - /* Compress the data */ - ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH); - wrote_IDAT = 0; - - /* Check for compression errors */ - if (ret != Z_OK) - { - if (png_ptr->zstream.msg != NULL) - png_error(png_ptr, png_ptr->zstream.msg); - else - png_error(png_ptr, "zlib error"); - } - - if (!(png_ptr->zstream.avail_out)) - { - /* Write the IDAT and reset the zlib output buffer */ - png_write_IDAT(png_ptr, png_ptr->zbuf, - png_ptr->zbuf_size); - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - wrote_IDAT = 1; - } - } while(wrote_IDAT == 1); - - /* If there is any data left to be output, write it into a new IDAT */ - if (png_ptr->zbuf_size != png_ptr->zstream.avail_out) - { - /* Write the IDAT and reset the zlib output buffer */ - png_write_IDAT(png_ptr, png_ptr->zbuf, - png_ptr->zbuf_size - png_ptr->zstream.avail_out); - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - } + png_compress_IDAT(png_ptr, NULL, 0, Z_SYNC_FLUSH); png_ptr->flush_rows = 0; png_flush(png_ptr); } #endif /* PNG_WRITE_FLUSH_SUPPORTED */ -/* Free all memory used by the write */ -void PNGAPI -png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr) +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED +static void png_reset_filter_heuristics(png_structrp png_ptr);/* forward decl */ +#endif + +/* Free any memory used in png_ptr struct without freeing the struct itself. */ +static void +png_write_destroy(png_structrp png_ptr) { - png_structp png_ptr = NULL; - png_infop info_ptr = NULL; -#ifdef PNG_USER_MEM_SUPPORTED - png_free_ptr free_fn = NULL; - png_voidp mem_ptr = NULL; -#endif - - png_debug(1, "in png_destroy_write_struct"); - - if (png_ptr_ptr != NULL) - { - png_ptr = *png_ptr_ptr; -#ifdef PNG_USER_MEM_SUPPORTED - free_fn = png_ptr->free_fn; - mem_ptr = png_ptr->mem_ptr; -#endif - } - -#ifdef PNG_USER_MEM_SUPPORTED - if (png_ptr != NULL) - { - free_fn = png_ptr->free_fn; - mem_ptr = png_ptr->mem_ptr; - } -#endif - - if (info_ptr_ptr != NULL) - info_ptr = *info_ptr_ptr; - - if (info_ptr != NULL) - { - if (png_ptr != NULL) - { - png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); - -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - if (png_ptr->num_chunk_list) - { - png_free(png_ptr, png_ptr->chunk_list); - png_ptr->num_chunk_list = 0; - } -#endif - } - -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, - (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)info_ptr); -#endif - *info_ptr_ptr = NULL; - } - - if (png_ptr != NULL) - { - png_write_destroy(png_ptr); -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, - (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)png_ptr); -#endif - *png_ptr_ptr = NULL; - } -} - - -/* Free any memory used in png_ptr struct (old method) */ -void /* PRIVATE */ -png_write_destroy(png_structp png_ptr) -{ -#ifdef PNG_SETJMP_SUPPORTED - jmp_buf tmp_jmp; /* Save jump buffer */ -#endif - png_error_ptr error_fn; - png_error_ptr warning_fn; - png_voidp error_ptr; -#ifdef PNG_USER_MEM_SUPPORTED - png_free_ptr free_fn; -#endif - png_debug(1, "in png_write_destroy"); /* Free any memory zlib uses */ - deflateEnd(&png_ptr->zstream); + if (png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) + deflateEnd(&png_ptr->zstream); /* Free our memory. png_free checks NULL for us. */ - png_free(png_ptr, png_ptr->zbuf); + png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list); png_free(png_ptr, png_ptr->row_buf); #ifdef PNG_WRITE_FILTER_SUPPORTED png_free(png_ptr, png_ptr->prev_row); @@ -1002,56 +872,64 @@ png_write_destroy(png_structp png_ptr) png_free(png_ptr, png_ptr->paeth_row); #endif -#ifdef PNG_TIME_RFC1123_SUPPORTED - png_free(png_ptr, png_ptr->time_buffer); -#endif - #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED - png_free(png_ptr, png_ptr->prev_filters); - png_free(png_ptr, png_ptr->filter_weights); - png_free(png_ptr, png_ptr->inv_filter_weights); + /* Use this to save a little code space, it doesn't free the filter_costs */ + png_reset_filter_heuristics(png_ptr); png_free(png_ptr, png_ptr->filter_costs); png_free(png_ptr, png_ptr->inv_filter_costs); #endif -#ifdef PNG_SETJMP_SUPPORTED - /* Reset structure */ - png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf)); +#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED + png_free(png_ptr, png_ptr->chunk_list); #endif - error_fn = png_ptr->error_fn; - warning_fn = png_ptr->warning_fn; - error_ptr = png_ptr->error_ptr; -#ifdef PNG_USER_MEM_SUPPORTED - free_fn = png_ptr->free_fn; -#endif + /* The error handling and memory handling information is left intact at this + * point: the jmp_buf may still have to be freed. See png_destroy_png_struct + * for how this happens. + */ +} - png_memset(png_ptr, 0, png_sizeof(png_struct)); +/* Free all memory used by the write. + * In libpng 1.6.0 this API changed quietly to no longer accept a NULL value for + * *png_ptr_ptr. Prior to 1.6.0 it would accept such a value and it would free + * the passed in info_structs but it would quietly fail to free any of the data + * inside them. In 1.6.0 it quietly does nothing (it has to be quiet because it + * has no png_ptr.) + */ +void PNGAPI +png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr) +{ + png_debug(1, "in png_destroy_write_struct"); - png_ptr->error_fn = error_fn; - png_ptr->warning_fn = warning_fn; - png_ptr->error_ptr = error_ptr; -#ifdef PNG_USER_MEM_SUPPORTED - png_ptr->free_fn = free_fn; -#endif + if (png_ptr_ptr != NULL) + { + png_structrp png_ptr = *png_ptr_ptr; -#ifdef PNG_SETJMP_SUPPORTED - png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); -#endif + if (png_ptr != NULL) /* added in libpng 1.6.0 */ + { + png_destroy_info_struct(png_ptr, info_ptr_ptr); + + *png_ptr_ptr = NULL; + png_write_destroy(png_ptr); + png_destroy_png_struct(png_ptr); + } + } } /* Allow the application to select one or more row filters to use. */ void PNGAPI -png_set_filter(png_structp png_ptr, int method, int filters) +png_set_filter(png_structrp png_ptr, int method, int filters) { png_debug(1, "in png_set_filter"); if (png_ptr == NULL) return; + #ifdef PNG_MNG_FEATURES_SUPPORTED if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && - (method == PNG_INTRAPIXEL_DIFFERENCING)) - method = PNG_FILTER_TYPE_BASE; + (method == PNG_INTRAPIXEL_DIFFERENCING)) + method = PNG_FILTER_TYPE_BASE; + #endif if (method == PNG_FILTER_TYPE_BASE) { @@ -1060,22 +938,30 @@ png_set_filter(png_structp png_ptr, int method, int filters) #ifdef PNG_WRITE_FILTER_SUPPORTED case 5: case 6: - case 7: png_warning(png_ptr, "Unknown row filter for method 0"); + case 7: png_app_error(png_ptr, "Unknown row filter for method 0"); + /* FALL THROUGH */ #endif /* PNG_WRITE_FILTER_SUPPORTED */ case PNG_FILTER_VALUE_NONE: - png_ptr->do_filter = PNG_FILTER_NONE; break; + png_ptr->do_filter = PNG_FILTER_NONE; break; + #ifdef PNG_WRITE_FILTER_SUPPORTED case PNG_FILTER_VALUE_SUB: - png_ptr->do_filter = PNG_FILTER_SUB; break; + png_ptr->do_filter = PNG_FILTER_SUB; break; + case PNG_FILTER_VALUE_UP: - png_ptr->do_filter = PNG_FILTER_UP; break; + png_ptr->do_filter = PNG_FILTER_UP; break; + case PNG_FILTER_VALUE_AVG: - png_ptr->do_filter = PNG_FILTER_AVG; break; + png_ptr->do_filter = PNG_FILTER_AVG; break; + case PNG_FILTER_VALUE_PAETH: - png_ptr->do_filter = PNG_FILTER_PAETH; break; - default: png_ptr->do_filter = (png_byte)filters; break; + png_ptr->do_filter = PNG_FILTER_PAETH; break; + + default: + png_ptr->do_filter = (png_byte)filters; break; #else - default: png_warning(png_ptr, "Unknown row filter for method 0"); + default: + png_app_error(png_ptr, "Unknown row filter for method 0"); #endif /* PNG_WRITE_FILTER_SUPPORTED */ } @@ -1094,7 +980,7 @@ png_set_filter(png_structp png_ptr, int method, int filters) if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL) { png_ptr->sub_row = (png_bytep)png_malloc(png_ptr, - (png_ptr->rowbytes + 1)); + (png_ptr->rowbytes + 1)); png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB; } @@ -1103,12 +989,14 @@ png_set_filter(png_structp png_ptr, int method, int filters) if (png_ptr->prev_row == NULL) { png_warning(png_ptr, "Can't add Up filter after starting"); - png_ptr->do_filter &= ~PNG_FILTER_UP; + png_ptr->do_filter = (png_byte)(png_ptr->do_filter & + ~PNG_FILTER_UP); } + else { png_ptr->up_row = (png_bytep)png_malloc(png_ptr, - (png_ptr->rowbytes + 1)); + (png_ptr->rowbytes + 1)); png_ptr->up_row[0] = PNG_FILTER_VALUE_UP; } } @@ -1118,12 +1006,14 @@ png_set_filter(png_structp png_ptr, int method, int filters) if (png_ptr->prev_row == NULL) { png_warning(png_ptr, "Can't add Average filter after starting"); - png_ptr->do_filter &= ~PNG_FILTER_AVG; + png_ptr->do_filter = (png_byte)(png_ptr->do_filter & + ~PNG_FILTER_AVG); } + else { png_ptr->avg_row = (png_bytep)png_malloc(png_ptr, - (png_ptr->rowbytes + 1)); + (png_ptr->rowbytes + 1)); png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG; } } @@ -1136,10 +1026,11 @@ png_set_filter(png_structp png_ptr, int method, int filters) png_warning(png_ptr, "Can't add Paeth filter after starting"); png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH); } + else { png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr, - (png_ptr->rowbytes + 1)); + (png_ptr->rowbytes + 1)); png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH; } } @@ -1161,209 +1052,421 @@ png_set_filter(png_structp png_ptr, int method, int filters) * better compression. */ #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */ -void PNGAPI -png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, - int num_weights, png_doublep filter_weights, - png_doublep filter_costs) +/* Convenience reset API. */ +static void +png_reset_filter_heuristics(png_structrp png_ptr) { - int i; + /* Clear out any old values in the 'weights' - this must be done because if + * the app calls set_filter_heuristics multiple times with different + * 'num_weights' values we would otherwise potentially have wrong sized + * arrays. + */ + png_ptr->num_prev_filters = 0; + png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED; + if (png_ptr->prev_filters != NULL) + { + png_bytep old = png_ptr->prev_filters; + png_ptr->prev_filters = NULL; + png_free(png_ptr, old); + } + if (png_ptr->filter_weights != NULL) + { + png_uint_16p old = png_ptr->filter_weights; + png_ptr->filter_weights = NULL; + png_free(png_ptr, old); + } - png_debug(1, "in png_set_filter_heuristics"); + if (png_ptr->inv_filter_weights != NULL) + { + png_uint_16p old = png_ptr->inv_filter_weights; + png_ptr->inv_filter_weights = NULL; + png_free(png_ptr, old); + } + /* Leave the filter_costs - this array is fixed size. */ +} + +static int +png_init_filter_heuristics(png_structrp png_ptr, int heuristic_method, + int num_weights) +{ if (png_ptr == NULL) - return; - if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST) - { - png_warning(png_ptr, "Unknown filter heuristic method"); - return; - } + return 0; - if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT) - { - heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED; - } + /* Clear out the arrays */ + png_reset_filter_heuristics(png_ptr); - if (num_weights < 0 || filter_weights == NULL || - heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED) + /* Check arguments; the 'reset' function makes the correct settings for the + * unweighted case, but we must handle the weight case by initializing the + * arrays for the caller. + */ + if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) { - num_weights = 0; - } + int i; - png_ptr->num_prev_filters = (png_byte)num_weights; - png_ptr->heuristic_method = (png_byte)heuristic_method; - - if (num_weights > 0) - { - if (png_ptr->prev_filters == NULL) + if (num_weights > 0) { png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr, - (png_uint_32)(png_sizeof(png_byte) * num_weights)); + (png_uint_32)((sizeof (png_byte)) * num_weights)); /* To make sure that the weighting starts out fairly */ for (i = 0; i < num_weights; i++) { png_ptr->prev_filters[i] = 255; } - } - if (png_ptr->filter_weights == NULL) - { png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr, - (png_uint_32)(png_sizeof(png_uint_16) * num_weights)); + (png_uint_32)((sizeof (png_uint_16)) * num_weights)); png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr, - (png_uint_32)(png_sizeof(png_uint_16) * num_weights)); + (png_uint_32)((sizeof (png_uint_16)) * num_weights)); + for (i = 0; i < num_weights; i++) { png_ptr->inv_filter_weights[i] = png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; } + + /* Safe to set this now */ + png_ptr->num_prev_filters = (png_byte)num_weights; } - for (i = 0; i < num_weights; i++) + /* If, in the future, there are other filter methods, this would + * need to be based on png_ptr->filter. + */ + if (png_ptr->filter_costs == NULL) { - if (filter_weights[i] < 0.0) - { - png_ptr->inv_filter_weights[i] = - png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; - } - else - { - png_ptr->inv_filter_weights[i] = - (png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5); - png_ptr->filter_weights[i] = - (png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5); - } + png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr, + (png_uint_32)((sizeof (png_uint_16)) * PNG_FILTER_VALUE_LAST)); + + png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr, + (png_uint_32)((sizeof (png_uint_16)) * PNG_FILTER_VALUE_LAST)); } - } - - /* If, in the future, there are other filter methods, this would - * need to be based on png_ptr->filter. - */ - if (png_ptr->filter_costs == NULL) - { - png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr, - (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST)); - - png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr, - (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST)); for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) { png_ptr->inv_filter_costs[i] = png_ptr->filter_costs[i] = PNG_COST_FACTOR; } - } - /* Here is where we set the relative costs of the different filters. We - * should take the desired compression level into account when setting - * the costs, so that Paeth, for instance, has a high relative cost at low - * compression levels, while it has a lower relative cost at higher - * compression settings. The filter types are in order of increasing - * relative cost, so it would be possible to do this with an algorithm. - */ - for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) + /* All the arrays are inited, safe to set this: */ + png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_WEIGHTED; + + /* Return the 'ok' code. */ + return 1; + } + else if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT || + heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED) { - if (filter_costs == NULL || filter_costs[i] < 0.0) + return 1; + } + else + { + png_warning(png_ptr, "Unknown filter heuristic method"); + return 0; + } +} + +/* Provide floating and fixed point APIs */ +#ifdef PNG_FLOATING_POINT_SUPPORTED +void PNGAPI +png_set_filter_heuristics(png_structrp png_ptr, int heuristic_method, + int num_weights, png_const_doublep filter_weights, + png_const_doublep filter_costs) +{ + png_debug(1, "in png_set_filter_heuristics"); + + /* The internal API allocates all the arrays and ensures that the elements of + * those arrays are set to the default value. + */ + if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights)) + return; + + /* If using the weighted method copy in the weights. */ + if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) + { + int i; + for (i = 0; i < num_weights; i++) { - png_ptr->inv_filter_costs[i] = - png_ptr->filter_costs[i] = PNG_COST_FACTOR; + if (filter_weights[i] <= 0.0) + { + png_ptr->inv_filter_weights[i] = + png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; + } + + else + { + png_ptr->inv_filter_weights[i] = + (png_uint_16)(PNG_WEIGHT_FACTOR*filter_weights[i]+.5); + + png_ptr->filter_weights[i] = + (png_uint_16)(PNG_WEIGHT_FACTOR/filter_weights[i]+.5); + } } - else if (filter_costs[i] >= 1.0) + + /* Here is where we set the relative costs of the different filters. We + * should take the desired compression level into account when setting + * the costs, so that Paeth, for instance, has a high relative cost at low + * compression levels, while it has a lower relative cost at higher + * compression settings. The filter types are in order of increasing + * relative cost, so it would be possible to do this with an algorithm. + */ + for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) if (filter_costs[i] >= 1.0) { png_ptr->inv_filter_costs[i] = - (png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5); + (png_uint_16)(PNG_COST_FACTOR / filter_costs[i] + .5); + png_ptr->filter_costs[i] = - (png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5); + (png_uint_16)(PNG_COST_FACTOR * filter_costs[i] + .5); } } } +#endif /* FLOATING_POINT */ + +#ifdef PNG_FIXED_POINT_SUPPORTED +void PNGAPI +png_set_filter_heuristics_fixed(png_structrp png_ptr, int heuristic_method, + int num_weights, png_const_fixed_point_p filter_weights, + png_const_fixed_point_p filter_costs) +{ + png_debug(1, "in png_set_filter_heuristics_fixed"); + + /* The internal API allocates all the arrays and ensures that the elements of + * those arrays are set to the default value. + */ + if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights)) + return; + + /* If using the weighted method copy in the weights. */ + if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) + { + int i; + for (i = 0; i < num_weights; i++) + { + if (filter_weights[i] <= 0) + { + png_ptr->inv_filter_weights[i] = + png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; + } + + else + { + png_ptr->inv_filter_weights[i] = (png_uint_16) + ((PNG_WEIGHT_FACTOR*filter_weights[i]+PNG_FP_HALF)/PNG_FP_1); + + png_ptr->filter_weights[i] = (png_uint_16)((PNG_WEIGHT_FACTOR* + PNG_FP_1+(filter_weights[i]/2))/filter_weights[i]); + } + } + + /* Here is where we set the relative costs of the different filters. We + * should take the desired compression level into account when setting + * the costs, so that Paeth, for instance, has a high relative cost at low + * compression levels, while it has a lower relative cost at higher + * compression settings. The filter types are in order of increasing + * relative cost, so it would be possible to do this with an algorithm. + */ + for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) + if (filter_costs[i] >= PNG_FP_1) + { + png_uint_32 tmp; + + /* Use a 32 bit unsigned temporary here because otherwise the + * intermediate value will be a 32 bit *signed* integer (ANSI rules) + * and this will get the wrong answer on division. + */ + tmp = PNG_COST_FACTOR*PNG_FP_1 + (filter_costs[i]/2); + tmp /= filter_costs[i]; + + png_ptr->inv_filter_costs[i] = (png_uint_16)tmp; + + tmp = PNG_COST_FACTOR * filter_costs[i] + PNG_FP_HALF; + tmp /= PNG_FP_1; + + png_ptr->filter_costs[i] = (png_uint_16)tmp; + } + } +} +#endif /* FIXED_POINT */ #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ void PNGAPI -png_set_compression_level(png_structp png_ptr, int level) +png_set_compression_level(png_structrp png_ptr, int level) { png_debug(1, "in png_set_compression_level"); if (png_ptr == NULL) return; - png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL; + png_ptr->zlib_level = level; } void PNGAPI -png_set_compression_mem_level(png_structp png_ptr, int mem_level) +png_set_compression_mem_level(png_structrp png_ptr, int mem_level) { png_debug(1, "in png_set_compression_mem_level"); if (png_ptr == NULL) return; - png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL; + png_ptr->zlib_mem_level = mem_level; } void PNGAPI -png_set_compression_strategy(png_structp png_ptr, int strategy) +png_set_compression_strategy(png_structrp png_ptr, int strategy) { png_debug(1, "in png_set_compression_strategy"); if (png_ptr == NULL) return; + + /* The flag setting here prevents the libpng dynamic selection of strategy. + */ png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY; png_ptr->zlib_strategy = strategy; } +/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a + * smaller value of window_bits if it can do so safely. + */ void PNGAPI -png_set_compression_window_bits(png_structp png_ptr, int window_bits) +png_set_compression_window_bits(png_structrp png_ptr, int window_bits) { if (png_ptr == NULL) return; + + /* Prior to 1.6.0 this would warn but then set the window_bits value, this + * meant that negative window bits values could be selected which would cause + * libpng to write a non-standard PNG file with raw deflate or gzip + * compressed IDAT or ancillary chunks. Such files can be read and there is + * no warning on read, so this seems like a very bad idea. + */ if (window_bits > 15) + { png_warning(png_ptr, "Only compression windows <= 32k supported by PNG"); + window_bits = 15; + } + else if (window_bits < 8) + { png_warning(png_ptr, "Only compression windows >= 256 supported by PNG"); -#ifndef WBITS_8_OK - /* Avoid libpng bug with 256-byte windows */ - if (window_bits == 8) - { - png_warning(png_ptr, "Compression window is being reset to 512"); - window_bits = 9; - } -#endif - png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS; + window_bits = 8; + } + png_ptr->zlib_window_bits = window_bits; } void PNGAPI -png_set_compression_method(png_structp png_ptr, int method) +png_set_compression_method(png_structrp png_ptr, int method) { png_debug(1, "in png_set_compression_method"); if (png_ptr == NULL) return; + + /* This would produce an invalid PNG file if it worked, but it doesn't and + * deflate will fault it, so it is harmless to just warn here. + */ if (method != 8) png_warning(png_ptr, "Only compression method 8 is supported by PNG"); - png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD; + png_ptr->zlib_method = method; } +/* The following were added to libpng-1.5.4 */ +#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED void PNGAPI -png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn) +png_set_text_compression_level(png_structrp png_ptr, int level) +{ + png_debug(1, "in png_set_text_compression_level"); + + if (png_ptr == NULL) + return; + + png_ptr->zlib_text_level = level; +} + +void PNGAPI +png_set_text_compression_mem_level(png_structrp png_ptr, int mem_level) +{ + png_debug(1, "in png_set_text_compression_mem_level"); + + if (png_ptr == NULL) + return; + + png_ptr->zlib_text_mem_level = mem_level; +} + +void PNGAPI +png_set_text_compression_strategy(png_structrp png_ptr, int strategy) +{ + png_debug(1, "in png_set_text_compression_strategy"); + + if (png_ptr == NULL) + return; + + png_ptr->zlib_text_strategy = strategy; +} + +/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a + * smaller value of window_bits if it can do so safely. + */ +void PNGAPI +png_set_text_compression_window_bits(png_structrp png_ptr, int window_bits) { if (png_ptr == NULL) return; + + if (window_bits > 15) + { + png_warning(png_ptr, "Only compression windows <= 32k supported by PNG"); + window_bits = 15; + } + + else if (window_bits < 8) + { + png_warning(png_ptr, "Only compression windows >= 256 supported by PNG"); + window_bits = 8; + } + + png_ptr->zlib_text_window_bits = window_bits; +} + +void PNGAPI +png_set_text_compression_method(png_structrp png_ptr, int method) +{ + png_debug(1, "in png_set_text_compression_method"); + + if (png_ptr == NULL) + return; + + if (method != 8) + png_warning(png_ptr, "Only compression method 8 is supported by PNG"); + + png_ptr->zlib_text_method = method; +} +#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */ +/* end of API added to libpng-1.5.4 */ + +void PNGAPI +png_set_write_status_fn(png_structrp png_ptr, png_write_status_ptr write_row_fn) +{ + if (png_ptr == NULL) + return; + png_ptr->write_row_fn = write_row_fn; } #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED void PNGAPI -png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr - write_user_transform_fn) +png_set_write_user_transform_fn(png_structrp png_ptr, png_user_transform_ptr + write_user_transform_fn) { png_debug(1, "in png_set_write_user_transform_fn"); if (png_ptr == NULL) return; + png_ptr->transformations |= PNG_USER_TRANSFORM; png_ptr->write_user_transform_fn = write_user_transform_fn; } @@ -1372,8 +1475,8 @@ png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr #ifdef PNG_INFO_IMAGE_SUPPORTED void PNGAPI -png_write_png(png_structp png_ptr, png_infop info_ptr, - int transforms, voidp params) +png_write_png(png_structrp png_ptr, png_inforp info_ptr, + int transforms, voidp params) { if (png_ptr == NULL || info_ptr == NULL) return; @@ -1394,7 +1497,7 @@ png_write_png(png_structp png_ptr, png_infop info_ptr, * as appropriate to correctly scale the image. */ if ((transforms & PNG_TRANSFORM_SHIFT) - && (info_ptr->valid & PNG_INFO_sBIT)) + && (info_ptr->valid & PNG_INFO_sBIT)) png_set_shift(png_ptr, &info_ptr->sig_bit); #endif @@ -1411,9 +1514,10 @@ png_write_png(png_structp png_ptr, png_infop info_ptr, #endif #ifdef PNG_WRITE_FILLER_SUPPORTED - /* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */ + /* Pack XRGB/RGBX/ARGB/RGBA into RGB (4 channels -> 3 channels) */ if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER) png_set_filler(png_ptr, 0, PNG_FILLER_AFTER); + else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE); #endif @@ -1451,8 +1555,776 @@ png_write_png(png_structp png_ptr, png_infop info_ptr, /* It is REQUIRED to call this to finish writing the rest of the file */ png_write_end(png_ptr, info_ptr); - transforms = transforms; /* Quiet compiler warnings */ - params = params; + PNG_UNUSED(transforms) /* Quiet compiler warnings */ + PNG_UNUSED(params) } #endif + + +#ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED +#ifdef PNG_STDIO_SUPPORTED /* currently required for png_image_write_* */ +/* Initialize the write structure - general purpose utility. */ +static int +png_image_write_init(png_imagep image) +{ + png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, image, + png_safe_error, png_safe_warning); + + if (png_ptr != NULL) + { + png_infop info_ptr = png_create_info_struct(png_ptr); + + if (info_ptr != NULL) + { + png_controlp control = png_voidcast(png_controlp, + png_malloc_warn(png_ptr, (sizeof *control))); + + if (control != NULL) + { + memset(control, 0, (sizeof *control)); + + control->png_ptr = png_ptr; + control->info_ptr = info_ptr; + control->for_write = 1; + + image->opaque = control; + return 1; + } + + /* Error clean up */ + png_destroy_info_struct(png_ptr, &info_ptr); + } + + png_destroy_write_struct(&png_ptr, NULL); + } + + return png_image_error(image, "png_image_write_: out of memory"); +} + +/* Arguments to png_image_write_main: */ +typedef struct +{ + /* Arguments: */ + png_imagep image; + png_const_voidp buffer; + png_int_32 row_stride; + png_const_voidp colormap; + int convert_to_8bit; + /* Local variables: */ + png_const_voidp first_row; + ptrdiff_t row_bytes; + png_voidp local_row; +} png_image_write_control; + +/* Write png_uint_16 input to a 16-bit PNG; the png_ptr has already been set to + * do any necessary byte swapping. The component order is defined by the + * png_image format value. + */ +static int +png_write_image_16bit(png_voidp argument) +{ + png_image_write_control *display = png_voidcast(png_image_write_control*, + argument); + png_imagep image = display->image; + png_structrp png_ptr = image->opaque->png_ptr; + + png_const_uint_16p input_row = png_voidcast(png_const_uint_16p, + display->first_row); + png_uint_16p output_row = png_voidcast(png_uint_16p, display->local_row); + png_uint_16p row_end; + const int channels = (image->format & PNG_FORMAT_FLAG_COLOR) ? 3 : 1; + int aindex = 0; + png_uint_32 y = image->height; + + if (image->format & PNG_FORMAT_FLAG_ALPHA) + { + if (image->format & PNG_FORMAT_FLAG_AFIRST) + { + aindex = -1; + ++input_row; /* To point to the first component */ + ++output_row; + } + + else + aindex = channels; + } + + else + png_error(png_ptr, "png_write_image: internal call error"); + + /* Work out the output row end and count over this, note that the increment + * above to 'row' means that row_end can actually be beyond the end of the + * row; this is correct. + */ + row_end = output_row + image->width * (channels+1); + + while (y-- > 0) + { + png_const_uint_16p in_ptr = input_row; + png_uint_16p out_ptr = output_row; + + while (out_ptr < row_end) + { + const png_uint_16 alpha = in_ptr[aindex]; + png_uint_32 reciprocal = 0; + int c; + + out_ptr[aindex] = alpha; + + /* Calculate a reciprocal. The correct calculation is simply + * component/alpha*65535 << 15. (I.e. 15 bits of precision); this + * allows correct rounding by adding .5 before the shift. 'reciprocal' + * is only initialized when required. + */ + if (alpha > 0 && alpha < 65535) + reciprocal = ((0xffff<<15)+(alpha>>1))/alpha; + + c = channels; + do /* always at least one channel */ + { + png_uint_16 component = *in_ptr++; + + /* The following gives 65535 for an alpha of 0, which is fine, + * otherwise if 0/0 is represented as some other value there is more + * likely to be a discontinuity which will probably damage + * compression when moving from a fully transparent area to a + * nearly transparent one. (The assumption here is that opaque + * areas tend not to be 0 intensity.) + */ + if (component >= alpha) + component = 65535; + + /* component 0 && alpha < 65535) + { + png_uint_32 calc = component * reciprocal; + calc += 16384; /* round to nearest */ + component = (png_uint_16)(calc >> 15); + } + + *out_ptr++ = component; + } + while (--c > 0); + + /* Skip to next component (skip the intervening alpha channel) */ + ++in_ptr; + ++out_ptr; + } + + png_write_row(png_ptr, png_voidcast(png_const_bytep, display->local_row)); + input_row += display->row_bytes/(sizeof (png_uint_16)); + } + + return 1; +} + +/* Given 16-bit input (1 to 4 channels) write 8-bit output. If an alpha channel + * is present it must be removed from the components, the components are then + * written in sRGB encoding. No components are added or removed. + * + * Calculate an alpha reciprocal to reverse pre-multiplication. As above the + * calculation can be done to 15 bits of accuracy; however, the output needs to + * be scaled in the range 0..255*65535, so include that scaling here. + */ +#define UNP_RECIPROCAL(alpha) ((((0xffff*0xff)<<7)+(alpha>>1))/alpha) + +static png_byte +png_unpremultiply(png_uint_32 component, png_uint_32 alpha, + png_uint_32 reciprocal/*from the above macro*/) +{ + /* The following gives 1.0 for an alpha of 0, which is fine, otherwise if 0/0 + * is represented as some other value there is more likely to be a + * discontinuity which will probably damage compression when moving from a + * fully transparent area to a nearly transparent one. (The assumption here + * is that opaque areas tend not to be 0 intensity.) + * + * There is a rounding problem here; if alpha is less than 128 it will end up + * as 0 when scaled to 8 bits. To avoid introducing spurious colors into the + * output change for this too. + */ + if (component >= alpha || alpha < 128) + return 255; + + /* component 0) + { + /* The test is that alpha/257 (rounded) is less than 255, the first value + * that becomes 255 is 65407. + * NOTE: this must agree with the PNG_DIV257 macro (which must, therefore, + * be exact!) [Could also test reciprocal != 0] + */ + if (alpha < 65407) + { + component *= reciprocal; + component += 64; /* round to nearest */ + component >>= 7; + } + + else + component *= 255; + + /* Convert the component to sRGB. */ + return (png_byte)PNG_sRGB_FROM_LINEAR(component); + } + + else + return 0; +} + +static int +png_write_image_8bit(png_voidp argument) +{ + png_image_write_control *display = png_voidcast(png_image_write_control*, + argument); + png_imagep image = display->image; + png_structrp png_ptr = image->opaque->png_ptr; + + png_const_uint_16p input_row = png_voidcast(png_const_uint_16p, + display->first_row); + png_bytep output_row = png_voidcast(png_bytep, display->local_row); + png_uint_32 y = image->height; + const int channels = (image->format & PNG_FORMAT_FLAG_COLOR) ? 3 : 1; + + if (image->format & PNG_FORMAT_FLAG_ALPHA) + { + png_bytep row_end; + int aindex; + + if (image->format & PNG_FORMAT_FLAG_AFIRST) + { + aindex = -1; + ++input_row; /* To point to the first component */ + ++output_row; + } + + else + aindex = channels; + + /* Use row_end in place of a loop counter: */ + row_end = output_row + image->width * (channels+1); + + while (y-- > 0) + { + png_const_uint_16p in_ptr = input_row; + png_bytep out_ptr = output_row; + + while (out_ptr < row_end) + { + png_uint_16 alpha = in_ptr[aindex]; + png_byte alphabyte = (png_byte)PNG_DIV257(alpha); + png_uint_32 reciprocal = 0; + int c; + + /* Scale and write the alpha channel. */ + out_ptr[aindex] = alphabyte; + + if (alphabyte > 0 && alphabyte < 255) + reciprocal = UNP_RECIPROCAL(alpha); + + c = channels; + do /* always at least one channel */ + *out_ptr++ = png_unpremultiply(*in_ptr++, alpha, reciprocal); + while (--c > 0); + + /* Skip to next component (skip the intervening alpha channel) */ + ++in_ptr; + ++out_ptr; + } /* while out_ptr < row_end */ + + png_write_row(png_ptr, png_voidcast(png_const_bytep, + display->local_row)); + input_row += display->row_bytes/(sizeof (png_uint_16)); + } /* while y */ + } + + else + { + /* No alpha channel, so the row_end really is the end of the row and it + * is sufficient to loop over the components one by one. + */ + png_bytep row_end = output_row + image->width * channels; + + while (y-- > 0) + { + png_const_uint_16p in_ptr = input_row; + png_bytep out_ptr = output_row; + + while (out_ptr < row_end) + { + png_uint_32 component = *in_ptr++; + + component *= 255; + *out_ptr++ = (png_byte)PNG_sRGB_FROM_LINEAR(component); + } + + png_write_row(png_ptr, output_row); + input_row += display->row_bytes/(sizeof (png_uint_16)); + } + } + + return 1; +} + +static void +png_image_set_PLTE(png_image_write_control *display) +{ + const png_imagep image = display->image; + const void *cmap = display->colormap; + const int entries = image->colormap_entries > 256 ? 256 : + (int)image->colormap_entries; + + /* NOTE: the caller must check for cmap != NULL and entries != 0 */ + const png_uint_32 format = image->format; + const int channels = PNG_IMAGE_SAMPLE_CHANNELS(format); + +# ifdef PNG_FORMAT_BGR_SUPPORTED + const int afirst = (format & PNG_FORMAT_FLAG_AFIRST) != 0 && + (format & PNG_FORMAT_FLAG_ALPHA) != 0; +# else +# define afirst 0 +# endif + +# ifdef PNG_FORMAT_BGR_SUPPORTED + const int bgr = (format & PNG_FORMAT_FLAG_BGR) ? 2 : 0; +# else +# define bgr 0 +# endif + + int i, num_trans; + png_color palette[256]; + png_byte tRNS[256]; + + memset(tRNS, 255, (sizeof tRNS)); + memset(palette, 0, (sizeof palette)); + + for (i=num_trans=0; i= 3) /* RGB */ + { + palette[i].blue = (png_byte)PNG_sRGB_FROM_LINEAR(255 * + entry[(2 ^ bgr)]); + palette[i].green = (png_byte)PNG_sRGB_FROM_LINEAR(255 * + entry[1]); + palette[i].red = (png_byte)PNG_sRGB_FROM_LINEAR(255 * + entry[bgr]); + } + + else /* Gray */ + palette[i].blue = palette[i].red = palette[i].green = + (png_byte)PNG_sRGB_FROM_LINEAR(255 * *entry); + } + + else /* alpha */ + { + png_uint_16 alpha = entry[afirst ? 0 : channels-1]; + png_byte alphabyte = (png_byte)PNG_DIV257(alpha); + png_uint_32 reciprocal = 0; + + /* Calculate a reciprocal, as in the png_write_image_8bit code above + * this is designed to produce a value scaled to 255*65535 when + * divided by 128 (i.e. asr 7). + */ + if (alphabyte > 0 && alphabyte < 255) + reciprocal = (((0xffff*0xff)<<7)+(alpha>>1))/alpha; + + tRNS[i] = alphabyte; + if (alphabyte < 255) + num_trans = i+1; + + if (channels >= 3) /* RGB */ + { + palette[i].blue = png_unpremultiply(entry[afirst + (2 ^ bgr)], + alpha, reciprocal); + palette[i].green = png_unpremultiply(entry[afirst + 1], alpha, + reciprocal); + palette[i].red = png_unpremultiply(entry[afirst + bgr], alpha, + reciprocal); + } + + else /* gray */ + palette[i].blue = palette[i].red = palette[i].green = + png_unpremultiply(entry[afirst], alpha, reciprocal); + } + } + + else /* Color-map has sRGB values */ + { + png_const_bytep entry = png_voidcast(png_const_bytep, cmap); + + entry += i * channels; + + switch (channels) + { + case 4: + tRNS[i] = entry[afirst ? 0 : 3]; + if (tRNS[i] < 255) + num_trans = i+1; + /* FALL THROUGH */ + case 3: + palette[i].blue = entry[afirst + (2 ^ bgr)]; + palette[i].green = entry[afirst + 1]; + palette[i].red = entry[afirst + bgr]; + break; + + case 2: + tRNS[i] = entry[1 ^ afirst]; + if (tRNS[i] < 255) + num_trans = i+1; + /* FALL THROUGH */ + case 1: + palette[i].blue = palette[i].red = palette[i].green = + entry[afirst]; + break; + + default: + break; + } + } + } + +# ifdef afirst +# undef afirst +# endif +# ifdef bgr +# undef bgr +# endif + + png_set_PLTE(image->opaque->png_ptr, image->opaque->info_ptr, palette, + entries); + + if (num_trans > 0) + png_set_tRNS(image->opaque->png_ptr, image->opaque->info_ptr, tRNS, + num_trans, NULL); + + image->colormap_entries = entries; +} + +static int +png_image_write_main(png_voidp argument) +{ + png_image_write_control *display = png_voidcast(png_image_write_control*, + argument); + png_imagep image = display->image; + png_structrp png_ptr = image->opaque->png_ptr; + png_inforp info_ptr = image->opaque->info_ptr; + png_uint_32 format = image->format; + + int colormap = (format & PNG_FORMAT_FLAG_COLORMAP) != 0; + int linear = !colormap && (format & PNG_FORMAT_FLAG_LINEAR) != 0; /* input */ + int alpha = !colormap && (format & PNG_FORMAT_FLAG_ALPHA) != 0; + int write_16bit = linear && !colormap && !display->convert_to_8bit; + +# ifdef PNG_BENIGN_ERRORS_SUPPORTED + /* Make sure we error out on any bad situation */ + png_set_benign_errors(png_ptr, 0/*error*/); +# endif + + /* Default the 'row_stride' parameter if required. */ + if (display->row_stride == 0) + display->row_stride = PNG_IMAGE_ROW_STRIDE(*image); + + /* Set the required transforms then write the rows in the correct order. */ + if (format & PNG_FORMAT_FLAG_COLORMAP) + { + if (display->colormap != NULL && image->colormap_entries > 0) + { + png_uint_32 entries = image->colormap_entries; + + png_set_IHDR(png_ptr, info_ptr, image->width, image->height, + entries > 16 ? 8 : (entries > 4 ? 4 : (entries > 2 ? 2 : 1)), + PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE, + PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); + + png_image_set_PLTE(display); + } + + else + png_error(image->opaque->png_ptr, + "no color-map for color-mapped image"); + } + + else + png_set_IHDR(png_ptr, info_ptr, image->width, image->height, + write_16bit ? 16 : 8, + ((format & PNG_FORMAT_FLAG_COLOR) ? PNG_COLOR_MASK_COLOR : 0) + + ((format & PNG_FORMAT_FLAG_ALPHA) ? PNG_COLOR_MASK_ALPHA : 0), + PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); + + /* Counter-intuitively the data transformations must be called *after* + * png_write_info, not before as in the read code, but the 'set' functions + * must still be called before. Just set the color space information, never + * write an interlaced image. + */ + + if (write_16bit) + { + /* The gamma here is 1.0 (linear) and the cHRM chunk matches sRGB. */ + png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_LINEAR); + + if (!(image->flags & PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB)) + png_set_cHRM_fixed(png_ptr, info_ptr, + /* color x y */ + /* white */ 31270, 32900, + /* red */ 64000, 33000, + /* green */ 30000, 60000, + /* blue */ 15000, 6000 + ); + } + + else if (!(image->flags & PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB)) + png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_PERCEPTUAL); + + /* Else writing an 8-bit file and the *colors* aren't sRGB, but the 8-bit + * space must still be gamma encoded. + */ + else + png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_sRGB_INVERSE); + + /* Write the file header. */ + png_write_info(png_ptr, info_ptr); + + /* Now set up the data transformations (*after* the header is written), + * remove the handled transformations from the 'format' flags for checking. + * + * First check for a little endian system if writing 16 bit files. + */ + if (write_16bit) + { + PNG_CONST png_uint_16 le = 0x0001; + + if (*(png_const_bytep)&le) + png_set_swap(png_ptr); + } + +# ifdef PNG_SIMPLIFIED_WRITE_BGR_SUPPORTED + if (format & PNG_FORMAT_FLAG_BGR) + { + if (!colormap && (format & PNG_FORMAT_FLAG_COLOR) != 0) + png_set_bgr(png_ptr); + format &= ~PNG_FORMAT_FLAG_BGR; + } +# endif + +# ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED + if (format & PNG_FORMAT_FLAG_AFIRST) + { + if (!colormap && (format & PNG_FORMAT_FLAG_ALPHA) != 0) + png_set_swap_alpha(png_ptr); + format &= ~PNG_FORMAT_FLAG_AFIRST; + } +# endif + + /* If there are 16 or fewer color-map entries we wrote a lower bit depth + * above, but the application data is still byte packed. + */ + if (colormap && image->colormap_entries <= 16) + png_set_packing(png_ptr); + + /* That should have handled all (both) the transforms. */ + if ((format & ~(png_uint_32)(PNG_FORMAT_FLAG_COLOR | PNG_FORMAT_FLAG_LINEAR | + PNG_FORMAT_FLAG_ALPHA | PNG_FORMAT_FLAG_COLORMAP)) != 0) + png_error(png_ptr, "png_write_image: unsupported transformation"); + + { + png_const_bytep row = png_voidcast(png_const_bytep, display->buffer); + ptrdiff_t row_bytes = display->row_stride; + + if (linear) + row_bytes *= (sizeof (png_uint_16)); + + if (row_bytes < 0) + row += (image->height-1) * (-row_bytes); + + display->first_row = row; + display->row_bytes = row_bytes; + } + + /* Apply 'fast' options if the flag is set. */ + if ((image->flags & PNG_IMAGE_FLAG_FAST) != 0) + { + png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_NO_FILTERS); + /* NOTE: determined by experiment using pngstest, this reflects some + * balance between the time to write the image once and the time to read + * it about 50 times. The speed-up in pngstest was about 10-20% of the + * total (user) time on a heavily loaded system. + */ + png_set_compression_level(png_ptr, 3); + } + + /* Check for the cases that currently require a pre-transform on the row + * before it is written. This only applies when the input is 16-bit and + * either there is an alpha channel or it is converted to 8-bit. + */ + if ((linear && alpha) || (!colormap && display->convert_to_8bit)) + { + png_bytep row = png_voidcast(png_bytep, png_malloc(png_ptr, + png_get_rowbytes(png_ptr, info_ptr))); + int result; + + display->local_row = row; + if (write_16bit) + result = png_safe_execute(image, png_write_image_16bit, display); + else + result = png_safe_execute(image, png_write_image_8bit, display); + display->local_row = NULL; + + png_free(png_ptr, row); + + /* Skip the 'write_end' on error: */ + if (!result) + return 0; + } + + /* Otherwise this is the case where the input is in a format currently + * supported by the rest of the libpng write code; call it directly. + */ + else + { + png_const_bytep row = png_voidcast(png_const_bytep, display->first_row); + ptrdiff_t row_bytes = display->row_bytes; + png_uint_32 y = image->height; + + while (y-- > 0) + { + png_write_row(png_ptr, row); + row += row_bytes; + } + } + + png_write_end(png_ptr, info_ptr); + return 1; +} + +int PNGAPI +png_image_write_to_stdio(png_imagep image, FILE *file, int convert_to_8bit, + const void *buffer, png_int_32 row_stride, const void *colormap) +{ + /* Write the image to the given (FILE*). */ + if (image != NULL && image->version == PNG_IMAGE_VERSION) + { + if (file != NULL) + { + if (png_image_write_init(image)) + { + png_image_write_control display; + int result; + + /* This is slightly evil, but png_init_io doesn't do anything other + * than this and we haven't changed the standard IO functions so + * this saves a 'safe' function. + */ + image->opaque->png_ptr->io_ptr = file; + + memset(&display, 0, (sizeof display)); + display.image = image; + display.buffer = buffer; + display.row_stride = row_stride; + display.colormap = colormap; + display.convert_to_8bit = convert_to_8bit; + + result = png_safe_execute(image, png_image_write_main, &display); + png_image_free(image); + return result; + } + + else + return 0; + } + + else + return png_image_error(image, + "png_image_write_to_stdio: invalid argument"); + } + + else if (image != NULL) + return png_image_error(image, + "png_image_write_to_stdio: incorrect PNG_IMAGE_VERSION"); + + else + return 0; +} + +int PNGAPI +png_image_write_to_file(png_imagep image, const char *file_name, + int convert_to_8bit, const void *buffer, png_int_32 row_stride, + const void *colormap) +{ + /* Write the image to the named file. */ + if (image != NULL && image->version == PNG_IMAGE_VERSION) + { + if (file_name != NULL) + { + FILE *fp = fopen(file_name, "wb"); + + if (fp != NULL) + { + if (png_image_write_to_stdio(image, fp, convert_to_8bit, buffer, + row_stride, colormap)) + { + int error; /* from fflush/fclose */ + + /* Make sure the file is flushed correctly. */ + if (fflush(fp) == 0 && ferror(fp) == 0) + { + if (fclose(fp) == 0) + return 1; + + error = errno; /* from fclose */ + } + + else + { + error = errno; /* from fflush or ferror */ + (void)fclose(fp); + } + + (void)remove(file_name); + /* The image has already been cleaned up; this is just used to + * set the error (because the original write succeeded). + */ + return png_image_error(image, strerror(error)); + } + + else + { + /* Clean up: just the opened file. */ + (void)fclose(fp); + (void)remove(file_name); + return 0; + } + } + + else + return png_image_error(image, strerror(errno)); + } + + else + return png_image_error(image, + "png_image_write_to_file: invalid argument"); + } + + else if (image != NULL) + return png_image_error(image, + "png_image_write_to_file: incorrect PNG_IMAGE_VERSION"); + + else + return 0; +} +#endif /* PNG_STDIO_SUPPORTED */ +#endif /* SIMPLIFIED_WRITE */ #endif /* PNG_WRITE_SUPPORTED */ diff --git a/project/jni/png/pngwtran.c b/project/jni/png/pngwtran.c index 2925a9337..98703f8c8 100644 --- a/project/jni/png/pngwtran.c +++ b/project/jni/png/pngwtran.c @@ -1,8 +1,8 @@ /* pngwtran.c - transforms the data in a row for PNG writers * - * Last changed in libpng 1.4.1 [February 25, 2010] - * Copyright (c) 1998-2010 Glenn Randers-Pehrson + * Last changed in libpng 1.6.0 [February 14, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -11,16 +11,16 @@ * and license in png.h */ -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" -#ifdef PNG_WRITE_SUPPORTED #include "pngpriv.h" +#ifdef PNG_WRITE_SUPPORTED + +#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED /* Transform the data according to the user's wishes. The order of * transformations is significant. */ void /* PRIVATE */ -png_do_write_transformations(png_structp png_ptr) +png_do_write_transformations(png_structrp png_ptr, png_row_infop row_info) { png_debug(1, "in png_do_write_transformations"); @@ -30,56 +30,65 @@ png_do_write_transformations(png_structp png_ptr) #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED if (png_ptr->transformations & PNG_USER_TRANSFORM) if (png_ptr->write_user_transform_fn != NULL) - (*(png_ptr->write_user_transform_fn)) /* User write transform + (*(png_ptr->write_user_transform_fn)) /* User write transform function */ - (png_ptr, /* png_ptr */ - &(png_ptr->row_info), /* row_info: */ - /* png_uint_32 width; width of row */ - /* png_uint_32 rowbytes; number of bytes in row */ - /* png_byte color_type; color type of pixels */ - /* png_byte bit_depth; bit depth of samples */ - /* png_byte channels; number of channels (1-4) */ - /* png_byte pixel_depth; bits per pixel (depth*channels) */ - png_ptr->row_buf + 1); /* start of pixel data for row */ + (png_ptr, /* png_ptr */ + row_info, /* row_info: */ + /* png_uint_32 width; width of row */ + /* png_size_t rowbytes; number of bytes in row */ + /* png_byte color_type; color type of pixels */ + /* png_byte bit_depth; bit depth of samples */ + /* png_byte channels; number of channels (1-4) */ + /* png_byte pixel_depth; bits per pixel (depth*channels) */ + png_ptr->row_buf + 1); /* start of pixel data for row */ #endif + #ifdef PNG_WRITE_FILLER_SUPPORTED if (png_ptr->transformations & PNG_FILLER) - png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, - png_ptr->flags); + png_do_strip_channel(row_info, png_ptr->row_buf + 1, + !(png_ptr->flags & PNG_FLAG_FILLER_AFTER)); #endif + #ifdef PNG_WRITE_PACKSWAP_SUPPORTED if (png_ptr->transformations & PNG_PACKSWAP) - png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_packswap(row_info, png_ptr->row_buf + 1); #endif + #ifdef PNG_WRITE_PACK_SUPPORTED if (png_ptr->transformations & PNG_PACK) - png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1, - (png_uint_32)png_ptr->bit_depth); + png_do_pack(row_info, png_ptr->row_buf + 1, + (png_uint_32)png_ptr->bit_depth); #endif + #ifdef PNG_WRITE_SWAP_SUPPORTED if (png_ptr->transformations & PNG_SWAP_BYTES) - png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_swap(row_info, png_ptr->row_buf + 1); #endif + #ifdef PNG_WRITE_SHIFT_SUPPORTED if (png_ptr->transformations & PNG_SHIFT) - png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1, - &(png_ptr->shift)); + png_do_shift(row_info, png_ptr->row_buf + 1, + &(png_ptr->shift)); #endif + #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED if (png_ptr->transformations & PNG_SWAP_ALPHA) - png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_write_swap_alpha(row_info, png_ptr->row_buf + 1); #endif + #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED if (png_ptr->transformations & PNG_INVERT_ALPHA) - png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_write_invert_alpha(row_info, png_ptr->row_buf + 1); #endif + #ifdef PNG_WRITE_BGR_SUPPORTED if (png_ptr->transformations & PNG_BGR) - png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_bgr(row_info, png_ptr->row_buf + 1); #endif + #ifdef PNG_WRITE_INVERT_SUPPORTED if (png_ptr->transformations & PNG_INVERT_MONO) - png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_invert(row_info, png_ptr->row_buf + 1); #endif } @@ -114,9 +123,12 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) { if (*sp != 0) v |= mask; + sp++; + if (mask > 1) mask >>= 1; + else { mask = 0x80; @@ -125,10 +137,13 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) v = 0; } } + if (mask != 0x80) *dp = (png_byte)v; + break; } + case 2: { png_bytep sp, dp; @@ -140,12 +155,14 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) dp = row; shift = 6; v = 0; + for (i = 0; i < row_width; i++) { png_byte value; value = (png_byte)(*sp & 0x03); v |= (value << shift); + if (shift == 0) { shift = 6; @@ -153,14 +170,19 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) dp++; v = 0; } + else shift -= 2; + sp++; } + if (shift != 6) *dp = (png_byte)v; + break; } + case 4: { png_bytep sp, dp; @@ -172,6 +194,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) dp = row; shift = 4; v = 0; + for (i = 0; i < row_width; i++) { png_byte value; @@ -186,23 +209,27 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) dp++; v = 0; } + else shift -= 4; sp++; } + if (shift != 4) *dp = (png_byte)v; + break; } default: break; } + row_info->bit_depth = (png_byte)bit_depth; row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels); row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, - row_info->width); + row_info->width); } } #endif @@ -216,12 +243,12 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) * data to 0 to 15. */ void /* PRIVATE */ -png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) +png_do_shift(png_row_infop row_info, png_bytep row, + png_const_color_8p bit_depth) { png_debug(1, "in png_do_shift"); - if ( - row_info->color_type != PNG_COLOR_TYPE_PALETTE) + if (row_info->color_type != PNG_COLOR_TYPE_PALETTE) { int shift_start[4], shift_dec[4]; int channels = 0; @@ -231,19 +258,23 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) shift_start[channels] = row_info->bit_depth - bit_depth->red; shift_dec[channels] = bit_depth->red; channels++; + shift_start[channels] = row_info->bit_depth - bit_depth->green; shift_dec[channels] = bit_depth->green; channels++; + shift_start[channels] = row_info->bit_depth - bit_depth->blue; shift_dec[channels] = bit_depth->blue; channels++; } + else { shift_start[channels] = row_info->bit_depth - bit_depth->gray; shift_dec[channels] = bit_depth->gray; channels++; } + if (row_info->color_type & PNG_COLOR_MASK_ALPHA) { shift_start[channels] = row_info->bit_depth - bit_depth->alpha; @@ -255,33 +286,40 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) if (row_info->bit_depth < 8) { png_bytep bp = row; - png_uint_32 i; - png_byte mask; - png_uint_32 row_bytes = row_info->rowbytes; + png_size_t i; + unsigned int mask; + png_size_t row_bytes = row_info->rowbytes; if (bit_depth->gray == 1 && row_info->bit_depth == 2) mask = 0x55; + else if (row_info->bit_depth == 4 && bit_depth->gray == 3) mask = 0x11; + else mask = 0xff; for (i = 0; i < row_bytes; i++, bp++) { - png_uint_16 v; int j; + unsigned int v, out; v = *bp; - *bp = 0; + out = 0; + for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0]) { if (j > 0) - *bp |= (png_byte)((v << j) & 0xff); + out |= v << j; + else - *bp |= (png_byte)((v >> (-j)) & mask); + out |= (v >> (-j)) & mask; } + + *bp = (png_byte)(out & 0xff); } } + else if (row_info->bit_depth == 8) { png_bytep bp = row; @@ -291,21 +329,26 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) for (i = 0; i < istop; i++, bp++) { - png_uint_16 v; + const unsigned int c = i%channels; int j; - int c = (int)(i%channels); + unsigned int v, out; v = *bp; - *bp = 0; + out = 0; + for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) { if (j > 0) - *bp |= (png_byte)((v << j) & 0xff); + out |= v << j; + else - *bp |= (png_byte)((v >> (-j)) & 0xff); + out |= v >> (-j); } + + *bp = (png_byte)(out & 0xff); } } + else { png_bytep bp; @@ -314,20 +357,22 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) for (bp = row, i = 0; i < istop; i++) { - int c = (int)(i%channels); - png_uint_16 value, v; + const unsigned int c = i%channels; int j; + unsigned int value, v; - v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1)); + v = png_get_uint_16(bp); value = 0; + for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) { if (j > 0) - value |= (png_uint_16)((v << j) & (png_uint_16)0xffff); + value |= v << j; + else - value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff); + value |= v >> (-j); } - *bp++ = (png_byte)(value >> 8); + *bp++ = (png_byte)((value >> 8) & 0xff); *bp++ = (png_byte)(value & 0xff); } } @@ -344,12 +389,13 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) { if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - /* This converts from ARGB to RGBA */ if (row_info->bit_depth == 8) { + /* This converts from ARGB to RGBA */ png_bytep sp, dp; png_uint_32 i; png_uint_32 row_width = row_info->width; + for (i = 0, sp = dp = row; i < row_width; i++) { png_byte save = *(sp++); @@ -359,9 +405,11 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) *(dp++) = save; } } - /* This converts from AARRGGBB to RRGGBBAA */ + +#ifdef PNG_WRITE_16BIT_SUPPORTED else { + /* This converts from AARRGGBB to RRGGBBAA */ png_bytep sp, dp; png_uint_32 i; png_uint_32 row_width = row_info->width; @@ -381,12 +429,14 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) *(dp++) = save[1]; } } +#endif /* PNG_WRITE_16BIT_SUPPORTED */ } + else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) { - /* This converts from AG to GA */ if (row_info->bit_depth == 8) { + /* This converts from AG to GA */ png_bytep sp, dp; png_uint_32 i; png_uint_32 row_width = row_info->width; @@ -398,9 +448,11 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) *(dp++) = save; } } - /* This converts from AAGG to GGAA */ + +#ifdef PNG_WRITE_16BIT_SUPPORTED else { + /* This converts from AAGG to GGAA */ png_bytep sp, dp; png_uint_32 i; png_uint_32 row_width = row_info->width; @@ -416,6 +468,7 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) *(dp++) = save[1]; } } +#endif /* PNG_WRITE_16BIT_SUPPORTED */ } } } @@ -430,12 +483,13 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) { if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - /* This inverts the alpha channel in RGBA */ if (row_info->bit_depth == 8) { + /* This inverts the alpha channel in RGBA */ png_bytep sp, dp; png_uint_32 i; png_uint_32 row_width = row_info->width; + for (i = 0, sp = dp = row; i < row_width; i++) { /* Does nothing @@ -447,9 +501,11 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) *(dp++) = (png_byte)(255 - *(sp++)); } } - /* This inverts the alpha channel in RRGGBBAA */ + +#ifdef PNG_WRITE_16BIT_SUPPORTED else { + /* This inverts the alpha channel in RRGGBBAA */ png_bytep sp, dp; png_uint_32 i; png_uint_32 row_width = row_info->width; @@ -469,12 +525,14 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) *(dp++) = (png_byte)(255 - *(sp++)); } } +#endif /* PNG_WRITE_16BIT_SUPPORTED */ } + else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) { - /* This inverts the alpha channel in GA */ if (row_info->bit_depth == 8) { + /* This inverts the alpha channel in GA */ png_bytep sp, dp; png_uint_32 i; png_uint_32 row_width = row_info->width; @@ -485,9 +543,11 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) *(dp++) = (png_byte)(255 - *(sp++)); } } - /* This inverts the alpha channel in GGAA */ + +#ifdef PNG_WRITE_16BIT_SUPPORTED else { + /* This inverts the alpha channel in GGAA */ png_bytep sp, dp; png_uint_32 i; png_uint_32 row_width = row_info->width; @@ -503,10 +563,12 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) *(dp++) = (png_byte)(255 - *(sp++)); } } +#endif /* PNG_WRITE_16BIT_SUPPORTED */ } } } #endif +#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */ #ifdef PNG_MNG_FEATURES_SUPPORTED /* Undoes intrapixel differencing */ @@ -515,8 +577,7 @@ png_do_write_intrapixel(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_write_intrapixel"); - if ( - (row_info->color_type & PNG_COLOR_MASK_COLOR)) + if ((row_info->color_type & PNG_COLOR_MASK_COLOR)) { int bytes_per_pixel; png_uint_32 row_width = row_info->width; @@ -527,17 +588,21 @@ png_do_write_intrapixel(png_row_infop row_info, png_bytep row) if (row_info->color_type == PNG_COLOR_TYPE_RGB) bytes_per_pixel = 3; + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) bytes_per_pixel = 4; + else return; for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) { - *(rp) = (png_byte)((*rp - *(rp+1))&0xff); - *(rp+2) = (png_byte)((*(rp+2) - *(rp+1))&0xff); + *(rp) = (png_byte)((*rp - *(rp + 1)) & 0xff); + *(rp + 2) = (png_byte)((*(rp + 2) - *(rp + 1)) & 0xff); } } + +#ifdef PNG_WRITE_16BIT_SUPPORTED else if (row_info->bit_depth == 16) { png_bytep rp; @@ -545,24 +610,27 @@ png_do_write_intrapixel(png_row_infop row_info, png_bytep row) if (row_info->color_type == PNG_COLOR_TYPE_RGB) bytes_per_pixel = 6; + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) bytes_per_pixel = 8; + else return; for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) { - png_uint_32 s0 = (*(rp ) << 8) | *(rp+1); - png_uint_32 s1 = (*(rp+2) << 8) | *(rp+3); - png_uint_32 s2 = (*(rp+4) << 8) | *(rp+5); + png_uint_32 s0 = (*(rp ) << 8) | *(rp + 1); + png_uint_32 s1 = (*(rp + 2) << 8) | *(rp + 3); + png_uint_32 s2 = (*(rp + 4) << 8) | *(rp + 5); png_uint_32 red = (png_uint_32)((s0 - s1) & 0xffffL); png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL); - *(rp ) = (png_byte)((red >> 8) & 0xff); - *(rp+1) = (png_byte)(red & 0xff); - *(rp+4) = (png_byte)((blue >> 8) & 0xff); - *(rp+5) = (png_byte)(blue & 0xff); + *(rp ) = (png_byte)((red >> 8) & 0xff); + *(rp + 1) = (png_byte)(red & 0xff); + *(rp + 4) = (png_byte)((blue >> 8) & 0xff); + *(rp + 5) = (png_byte)(blue & 0xff); } } +#endif /* PNG_WRITE_16BIT_SUPPORTED */ } } #endif /* PNG_MNG_FEATURES_SUPPORTED */ diff --git a/project/jni/png/pngwutil.c b/project/jni/png/pngwutil.c index 8f7c7c24d..49e6a2d21 100644 --- a/project/jni/png/pngwutil.c +++ b/project/jni/png/pngwutil.c @@ -1,8 +1,8 @@ /* pngwutil.c - utilities to write a PNG file * - * Last changed in libpng 1.4.1 [February 25, 2010] - * Copyright (c) 1998-2010 Glenn Randers-Pehrson + * Last changed in libpng 1.6.2 [April 25, 2013] + * Copyright (c) 1998-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -11,11 +11,11 @@ * and license in png.h */ -#define PNG_NO_PEDANTIC_WARNINGS -#include "png.h" -#ifdef PNG_WRITE_SUPPORTED #include "pngpriv.h" +#ifdef PNG_WRITE_SUPPORTED + +#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED /* Place a 32-bit number into a buffer in PNG byte order. We work * with unsigned numbers for convenience, although one supported * ancillary chunk uses signed (two's complement) numbers. @@ -29,21 +29,6 @@ png_save_uint_32(png_bytep buf, png_uint_32 i) buf[3] = (png_byte)(i & 0xff); } -#ifdef PNG_SAVE_INT_32_SUPPORTED -/* The png_save_int_32 function assumes integers are stored in two's - * complement format. If this isn't the case, then this routine needs to - * be modified to write data in two's complement format. - */ -void PNGAPI -png_save_int_32(png_bytep buf, png_int_32 i) -{ - buf[0] = (png_byte)((i >> 24) & 0xff); - buf[1] = (png_byte)((i >> 16) & 0xff); - buf[2] = (png_byte)((i >> 8) & 0xff); - buf[3] = (png_byte)(i & 0xff); -} -#endif - /* Place a 16-bit number into a buffer in PNG byte order. * The parameter is declared unsigned int, not png_uint_16, * just to avoid potential problems on pre-ANSI C compilers. @@ -54,6 +39,7 @@ png_save_uint_16(png_bytep buf, unsigned int i) buf[0] = (png_byte)((i >> 8) & 0xff); buf[1] = (png_byte)(i & 0xff); } +#endif /* Simple function to write the signature. If we have already written * the magic bytes of the signature, or more likely, the PNG stream is @@ -62,7 +48,7 @@ png_save_uint_16(png_bytep buf, unsigned int i) * bytes have already been written. */ void PNGAPI -png_write_sig(png_structp png_ptr) +png_write_sig(png_structrp png_ptr) { png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; @@ -74,42 +60,25 @@ png_write_sig(png_structp png_ptr) /* Write the rest of the 8 byte signature */ png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes], (png_size_t)(8 - png_ptr->sig_bytes)); + if (png_ptr->sig_bytes < 3) png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; } -/* Write a PNG chunk all at once. The type is an array of ASCII characters - * representing the chunk name. The array must be at least 4 bytes in - * length, and does not need to be null terminated. To be safe, pass the - * pre-defined chunk names here, and if you need a new one, define it - * where the others are defined. The length is the length of the data. - * All the data must be present. If that is not possible, use the - * png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end() - * functions instead. - */ -void PNGAPI -png_write_chunk(png_structp png_ptr, png_bytep chunk_name, - png_bytep data, png_size_t length) -{ - if (png_ptr == NULL) - return; - png_write_chunk_start(png_ptr, chunk_name, (png_uint_32)length); - png_write_chunk_data(png_ptr, data, (png_size_t)length); - png_write_chunk_end(png_ptr); -} - /* Write the start of a PNG chunk. The type is the chunk type. * The total_length is the sum of the lengths of all the data you will be * passing in png_write_chunk_data(). */ -void PNGAPI -png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name, - png_uint_32 length) +static void +png_write_chunk_header(png_structrp png_ptr, png_uint_32 chunk_name, + png_uint_32 length) { png_byte buf[8]; - png_debug2(0, "Writing %s chunk, length = %lu", chunk_name, - (unsigned long)length); +#if defined(PNG_DEBUG) && (PNG_DEBUG > 0) + PNG_CSTRING_FROM_CHUNK(buf, chunk_name); + png_debug2(0, "Writing %s chunk, length = %lu", buf, (unsigned long)length); +#endif if (png_ptr == NULL) return; @@ -123,13 +92,16 @@ png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name, /* Write the length and the chunk name */ png_save_uint_32(buf, length); - png_memcpy(buf + 4, chunk_name, 4); - png_write_data(png_ptr, buf, (png_size_t)8); + png_save_uint_32(buf + 4, chunk_name); + png_write_data(png_ptr, buf, 8); + /* Put the chunk name into png_ptr->chunk_name */ - png_memcpy(png_ptr->chunk_name, chunk_name, 4); + png_ptr->chunk_name = chunk_name; + /* Reset the crc and run it over the chunk name */ png_reset_crc(png_ptr); - png_calculate_crc(png_ptr, chunk_name, 4); + + png_calculate_crc(png_ptr, buf + 4, 4); #ifdef PNG_IO_STATE_SUPPORTED /* Inform the I/O callback that chunk data will (possibly) be written. @@ -139,20 +111,30 @@ png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name, #endif } -/* Write the data of a PNG chunk started with png_write_chunk_start(). +void PNGAPI +png_write_chunk_start(png_structrp png_ptr, png_const_bytep chunk_string, + png_uint_32 length) +{ + png_write_chunk_header(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), length); +} + +/* Write the data of a PNG chunk started with png_write_chunk_header(). * Note that multiple calls to this function are allowed, and that the * sum of the lengths from these calls *must* add up to the total_length - * given to png_write_chunk_start(). + * given to png_write_chunk_header(). */ void PNGAPI -png_write_chunk_data(png_structp png_ptr, png_bytep data, png_size_t length) +png_write_chunk_data(png_structrp png_ptr, png_const_bytep data, + png_size_t length) { /* Write the data, and run the CRC over it */ if (png_ptr == NULL) return; + if (data != NULL && length > 0) { png_write_data(png_ptr, data, length); + /* Update the CRC after writing the data, * in case that the user I/O routine alters it. */ @@ -160,9 +142,9 @@ png_write_chunk_data(png_structp png_ptr, png_bytep data, png_size_t length) } } -/* Finish a chunk started with png_write_chunk_start(). */ +/* Finish a chunk started with png_write_chunk_header(). */ void PNGAPI -png_write_chunk_end(png_structp png_ptr) +png_write_chunk_end(png_structrp png_ptr) { png_byte buf[4]; @@ -181,233 +163,586 @@ png_write_chunk_end(png_structp png_ptr) png_write_data(png_ptr, buf, (png_size_t)4); } -#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED) +/* Write a PNG chunk all at once. The type is an array of ASCII characters + * representing the chunk name. The array must be at least 4 bytes in + * length, and does not need to be null terminated. To be safe, pass the + * pre-defined chunk names here, and if you need a new one, define it + * where the others are defined. The length is the length of the data. + * All the data must be present. If that is not possible, use the + * png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end() + * functions instead. + */ +static void +png_write_complete_chunk(png_structrp png_ptr, png_uint_32 chunk_name, + png_const_bytep data, png_size_t length) +{ + if (png_ptr == NULL) + return; + + /* On 64 bit architectures 'length' may not fit in a png_uint_32. */ + if (length > PNG_UINT_31_MAX) + png_error(png_ptr, "length exceeds PNG maxima"); + + png_write_chunk_header(png_ptr, chunk_name, (png_uint_32)length); + png_write_chunk_data(png_ptr, data, length); + png_write_chunk_end(png_ptr); +} + +/* This is the API that calls the internal function above. */ +void PNGAPI +png_write_chunk(png_structrp png_ptr, png_const_bytep chunk_string, + png_const_bytep data, png_size_t length) +{ + png_write_complete_chunk(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), data, + length); +} + +/* This is used below to find the size of an image to pass to png_deflate_claim, + * so it only needs to be accurate if the size is less than 16384 bytes (the + * point at which a lower LZ window size can be used.) + */ +static png_alloc_size_t +png_image_size(png_structrp png_ptr) +{ + /* Only return sizes up to the maximum of a png_uint_32, do this by limiting + * the width and height used to 15 bits. + */ + png_uint_32 h = png_ptr->height; + + if (png_ptr->rowbytes < 32768 && h < 32768) + { + if (png_ptr->interlaced) + { + /* Interlacing makes the image larger because of the replication of + * both the filter byte and the padding to a byte boundary. + */ + png_uint_32 w = png_ptr->width; + unsigned int pd = png_ptr->pixel_depth; + png_alloc_size_t cb_base; + int pass; + + for (cb_base=0, pass=0; pass<=6; ++pass) + { + png_uint_32 pw = PNG_PASS_COLS(w, pass); + + if (pw > 0) + cb_base += (PNG_ROWBYTES(pd, pw)+1) * PNG_PASS_ROWS(h, pass); + } + + return cb_base; + } + + else + return (png_ptr->rowbytes+1) * h; + } + + else + return 0xffffffffU; +} + +#ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED + /* This is the code to hack the first two bytes of the deflate stream (the + * deflate header) to correct the windowBits value to match the actual data + * size. Note that the second argument is the *uncompressed* size but the + * first argument is the *compressed* data (and it must be deflate + * compressed.) + */ +static void +optimize_cmf(png_bytep data, png_alloc_size_t data_size) +{ + /* Optimize the CMF field in the zlib stream. The resultant zlib stream is + * still compliant to the stream specification. + */ + if (data_size <= 16384) /* else windowBits must be 15 */ + { + unsigned int z_cmf = data[0]; /* zlib compression method and flags */ + + if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70) + { + unsigned int z_cinfo; + unsigned int half_z_window_size; + + z_cinfo = z_cmf >> 4; + half_z_window_size = 1U << (z_cinfo + 7); + + if (data_size <= half_z_window_size) /* else no change */ + { + unsigned int tmp; + + do + { + half_z_window_size >>= 1; + --z_cinfo; + } + while (z_cinfo > 0 && data_size <= half_z_window_size); + + z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4); + + data[0] = (png_byte)z_cmf; + tmp = data[1] & 0xe0; + tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f; + data[1] = (png_byte)tmp; + } + } + } +} +#else +# define optimize_cmf(dp,dl) ((void)0) +#endif /* PNG_WRITE_OPTIMIZE_CMF_SUPPORTED */ + +/* Initialize the compressor for the appropriate type of compression. */ +static int +png_deflate_claim(png_structrp png_ptr, png_uint_32 owner, + png_alloc_size_t data_size) +{ + if (png_ptr->zowner != 0) + { + char msg[64]; + + PNG_STRING_FROM_CHUNK(msg, owner); + msg[4] = ':'; + msg[5] = ' '; + PNG_STRING_FROM_CHUNK(msg+6, png_ptr->zowner); + /* So the message that results is " using zstream"; this is an + * internal error, but is very useful for debugging. i18n requirements + * are minimal. + */ + (void)png_safecat(msg, (sizeof msg), 10, " using zstream"); +# if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC + png_warning(png_ptr, msg); + + /* Attempt sane error recovery */ + if (png_ptr->zowner == png_IDAT) /* don't steal from IDAT */ + { + png_ptr->zstream.msg = PNGZ_MSG_CAST("in use by IDAT"); + return Z_STREAM_ERROR; + } + + png_ptr->zowner = 0; +# else + png_error(png_ptr, msg); +# endif + } + + { + int level = png_ptr->zlib_level; + int method = png_ptr->zlib_method; + int windowBits = png_ptr->zlib_window_bits; + int memLevel = png_ptr->zlib_mem_level; + int strategy; /* set below */ + int ret; /* zlib return code */ + + if (owner == png_IDAT) + { + if (png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY) + strategy = png_ptr->zlib_strategy; + + else if (png_ptr->do_filter != PNG_FILTER_NONE) + strategy = PNG_Z_DEFAULT_STRATEGY; + + else + strategy = PNG_Z_DEFAULT_NOFILTER_STRATEGY; + } + + else + { +# ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED + level = png_ptr->zlib_text_level; + method = png_ptr->zlib_text_method; + windowBits = png_ptr->zlib_text_window_bits; + memLevel = png_ptr->zlib_text_mem_level; + strategy = png_ptr->zlib_text_strategy; +# else + /* If customization is not supported the values all come from the + * IDAT values except for the strategy, which is fixed to the + * default. (This is the pre-1.6.0 behavior too, although it was + * implemented in a very different way.) + */ + strategy = Z_DEFAULT_STRATEGY; +# endif + } + + /* Adjust 'windowBits' down if larger than 'data_size'; to stop this + * happening just pass 32768 as the data_size parameter. Notice that zlib + * requires an extra 262 bytes in the window in addition to the data to be + * able to see the whole of the data, so if data_size+262 takes us to the + * next windowBits size we need to fix up the value later. (Because even + * though deflate needs the extra window, inflate does not!) + */ + if (data_size <= 16384) + { + /* IMPLEMENTATION NOTE: this 'half_window_size' stuff is only here to + * work round a Microsoft Visual C misbehavior which, contrary to C-90, + * widens the result of the following shift to 64-bits if (and, + * apparently, only if) it is used in a test. + */ + unsigned int half_window_size = 1U << (windowBits-1); + + while (data_size + 262 <= half_window_size) + { + half_window_size >>= 1; + --windowBits; + } + } + + /* Check against the previous initialized values, if any. */ + if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) && + (png_ptr->zlib_set_level != level || + png_ptr->zlib_set_method != method || + png_ptr->zlib_set_window_bits != windowBits || + png_ptr->zlib_set_mem_level != memLevel || + png_ptr->zlib_set_strategy != strategy)) + { + if (deflateEnd(&png_ptr->zstream) != Z_OK) + png_warning(png_ptr, "deflateEnd failed (ignored)"); + + png_ptr->flags &= ~PNG_FLAG_ZSTREAM_INITIALIZED; + } + + /* For safety clear out the input and output pointers (currently zlib + * doesn't use them on Init, but it might in the future). + */ + png_ptr->zstream.next_in = NULL; + png_ptr->zstream.avail_in = 0; + png_ptr->zstream.next_out = NULL; + png_ptr->zstream.avail_out = 0; + + /* Now initialize if required, setting the new parameters, otherwise just + * to a simple reset to the previous parameters. + */ + if (png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) + ret = deflateReset(&png_ptr->zstream); + + else + { + ret = deflateInit2(&png_ptr->zstream, level, method, windowBits, + memLevel, strategy); + + if (ret == Z_OK) + png_ptr->flags |= PNG_FLAG_ZSTREAM_INITIALIZED; + } + + /* The return code is from either deflateReset or deflateInit2; they have + * pretty much the same set of error codes. + */ + if (ret == Z_OK) + png_ptr->zowner = owner; + + else + png_zstream_error(png_ptr, ret); + + return ret; + } +} + +/* Clean up (or trim) a linked list of compression buffers. */ +void /* PRIVATE */ +png_free_buffer_list(png_structrp png_ptr, png_compression_bufferp *listp) +{ + png_compression_bufferp list = *listp; + + if (list != NULL) + { + *listp = NULL; + + do + { + png_compression_bufferp next = list->next; + + png_free(png_ptr, list); + list = next; + } + while (list != NULL); + } +} + +#ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED /* This pair of functions encapsulates the operation of (a) compressing a * text string, and (b) issuing it later as a series of chunk data writes. * The compression_state structure is shared context for these functions - * set up by the caller in order to make the whole mess thread-safe. + * set up by the caller to allow access to the relevant local variables. + * + * compression_buffer (new in 1.6.0) is just a linked list of zbuffer_size + * temporary buffers. From 1.6.0 it is retained in png_struct so that it will + * be correctly freed in the event of a write error (previous implementations + * just leaked memory.) */ - typedef struct { - char *input; /* The uncompressed input data */ - int input_len; /* Its length */ - int num_output_ptr; /* Number of output pointers used */ - int max_output_ptr; /* Size of output_ptr */ - png_charpp output_ptr; /* Array of pointers to output */ + png_const_bytep input; /* The uncompressed input data */ + png_alloc_size_t input_len; /* Its length */ + png_uint_32 output_len; /* Final compressed length */ + png_byte output[1024]; /* First block of output */ } compression_state; -/* Compress given text into storage in the png_ptr structure */ -static int /* PRIVATE */ -png_text_compress(png_structp png_ptr, - png_charp text, png_size_t text_len, int compression, - compression_state *comp) +static void +png_text_compress_init(compression_state *comp, png_const_bytep input, + png_alloc_size_t input_len) +{ + comp->input = input; + comp->input_len = input_len; + comp->output_len = 0; +} + +/* Compress the data in the compression state input */ +static int +png_text_compress(png_structrp png_ptr, png_uint_32 chunk_name, + compression_state *comp, png_uint_32 prefix_len) { int ret; - comp->num_output_ptr = 0; - comp->max_output_ptr = 0; - comp->output_ptr = NULL; - comp->input = NULL; - comp->input_len = 0; - - /* We may just want to pass the text right through */ - if (compression == PNG_TEXT_COMPRESSION_NONE) - { - comp->input = text; - comp->input_len = text_len; - return((int)text_len); - } - - if (compression >= PNG_TEXT_COMPRESSION_LAST) - { -#ifdef PNG_STDIO_SUPPORTED - char msg[50]; - png_snprintf(msg, 50, "Unknown compression type %d", compression); - png_warning(png_ptr, msg); -#else - png_warning(png_ptr, "Unknown compression type"); -#endif - } - - /* We can't write the chunk until we find out how much data we have, - * which means we need to run the compressor first and save the - * output. This shouldn't be a problem, as the vast majority of - * comments should be reasonable, but we will set up an array of - * malloc'd pointers to be sure. + /* To find the length of the output it is necessary to first compress the + * input, the result is buffered rather than using the two-pass algorithm + * that is used on the inflate side; deflate is assumed to be slower and a + * PNG writer is assumed to have more memory available than a PNG reader. * - * If we knew the application was well behaved, we could simplify this - * greatly by assuming we can always malloc an output buffer large - * enough to hold the compressed text ((1001 * text_len / 1000) + 12) - * and malloc this directly. The only time this would be a bad idea is - * if we can't malloc more than 64K and we have 64K of random input - * data, or if the input string is incredibly large (although this - * wouldn't cause a failure, just a slowdown due to swapping). + * IMPLEMENTATION NOTE: the zlib API deflateBound() can be used to find an + * upper limit on the output size, but it is always bigger than the input + * size so it is likely to be more efficient to use this linked-list + * approach. */ + ret = png_deflate_claim(png_ptr, chunk_name, comp->input_len); - /* Set up the compression buffers */ - /* TODO: the following cast hides a potential overflow problem. */ - png_ptr->zstream.avail_in = (uInt)text_len; - /* NOTE: assume zlib doesn't overwrite the input */ - png_ptr->zstream.next_in = (Bytef *)text; - png_ptr->zstream.avail_out = png_ptr->zbuf_size; - png_ptr->zstream.next_out = png_ptr->zbuf; + if (ret != Z_OK) + return ret; - /* This is the same compression loop as in png_write_row() */ - do + /* Set up the compression buffers, we need a loop here to avoid overflowing a + * uInt. Use ZLIB_IO_MAX to limit the input. The output is always limited + * by the output buffer size, so there is no need to check that. Since this + * is ANSI-C we know that an 'int', hence a uInt, is always at least 16 bits + * in size. + */ { - /* Compress the data */ - ret = deflate(&png_ptr->zstream, Z_NO_FLUSH); - if (ret != Z_OK) + png_compression_bufferp *end = &png_ptr->zbuffer_list; + png_alloc_size_t input_len = comp->input_len; /* may be zero! */ + png_uint_32 output_len; + + /* zlib updates these for us: */ + png_ptr->zstream.next_in = PNGZ_INPUT_CAST(comp->input); + png_ptr->zstream.avail_in = 0; /* Set below */ + png_ptr->zstream.next_out = comp->output; + png_ptr->zstream.avail_out = (sizeof comp->output); + + output_len = png_ptr->zstream.avail_out; + + do { - /* Error */ - if (png_ptr->zstream.msg != NULL) - png_error(png_ptr, png_ptr->zstream.msg); - else - png_error(png_ptr, "zlib error"); - } - /* Check to see if we need more room */ - if (!(png_ptr->zstream.avail_out)) - { - /* Make sure the output array has room */ - if (comp->num_output_ptr >= comp->max_output_ptr) + uInt avail_in = ZLIB_IO_MAX; + + if (avail_in > input_len) + avail_in = (uInt)input_len; + + input_len -= avail_in; + + png_ptr->zstream.avail_in = avail_in; + + if (png_ptr->zstream.avail_out == 0) { - int old_max; + png_compression_buffer *next; - old_max = comp->max_output_ptr; - comp->max_output_ptr = comp->num_output_ptr + 4; - if (comp->output_ptr != NULL) + /* Chunk data is limited to 2^31 bytes in length, so the prefix + * length must be counted here. + */ + if (output_len + prefix_len > PNG_UINT_31_MAX) { - png_charpp old_ptr; - - old_ptr = comp->output_ptr; - comp->output_ptr = (png_charpp)png_malloc(png_ptr, - (png_alloc_size_t) - (comp->max_output_ptr * png_sizeof(png_charpp))); - png_memcpy(comp->output_ptr, old_ptr, old_max - * png_sizeof(png_charp)); - png_free(png_ptr, old_ptr); + ret = Z_MEM_ERROR; + break; } - else - comp->output_ptr = (png_charpp)png_malloc(png_ptr, - (png_alloc_size_t) - (comp->max_output_ptr * png_sizeof(png_charp))); - } - /* Save the data */ - comp->output_ptr[comp->num_output_ptr] = - (png_charp)png_malloc(png_ptr, - (png_alloc_size_t)png_ptr->zbuf_size); - png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf, - png_ptr->zbuf_size); - comp->num_output_ptr++; - - /* and reset the buffer */ - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - png_ptr->zstream.next_out = png_ptr->zbuf; - } - /* Continue until we don't have any more to compress */ - } while (png_ptr->zstream.avail_in); - - /* Finish the compression */ - do - { - /* Tell zlib we are finished */ - ret = deflate(&png_ptr->zstream, Z_FINISH); - - if (ret == Z_OK) - { - /* Check to see if we need more room */ - if (!(png_ptr->zstream.avail_out)) - { - /* Check to make sure our output array has room */ - if (comp->num_output_ptr >= comp->max_output_ptr) + /* Need a new (malloc'ed) buffer, but there may be one present + * already. + */ + next = *end; + if (next == NULL) { - int old_max; + next = png_voidcast(png_compression_bufferp, png_malloc_base + (png_ptr, PNG_COMPRESSION_BUFFER_SIZE(png_ptr))); - old_max = comp->max_output_ptr; - comp->max_output_ptr = comp->num_output_ptr + 4; - if (comp->output_ptr != NULL) + if (next == NULL) { - png_charpp old_ptr; - - old_ptr = comp->output_ptr; - /* This could be optimized to realloc() */ - comp->output_ptr = (png_charpp)png_malloc(png_ptr, - (png_alloc_size_t)(comp->max_output_ptr * - png_sizeof(png_charp))); - png_memcpy(comp->output_ptr, old_ptr, - old_max * png_sizeof(png_charp)); - png_free(png_ptr, old_ptr); + ret = Z_MEM_ERROR; + break; } - else - comp->output_ptr = (png_charpp)png_malloc(png_ptr, - (png_alloc_size_t)(comp->max_output_ptr * - png_sizeof(png_charp))); + + /* Link in this buffer (so that it will be freed later) */ + next->next = NULL; + *end = next; } - /* Save the data */ - comp->output_ptr[comp->num_output_ptr] = - (png_charp)png_malloc(png_ptr, - (png_alloc_size_t)png_ptr->zbuf_size); - png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf, - png_ptr->zbuf_size); - comp->num_output_ptr++; + png_ptr->zstream.next_out = next->output; + png_ptr->zstream.avail_out = png_ptr->zbuffer_size; + output_len += png_ptr->zstream.avail_out; - /* and reset the buffer pointers */ - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - png_ptr->zstream.next_out = png_ptr->zbuf; + /* Move 'end' to the next buffer pointer. */ + end = &next->next; } + + /* Compress the data */ + ret = deflate(&png_ptr->zstream, + input_len > 0 ? Z_NO_FLUSH : Z_FINISH); + + /* Claw back input data that was not consumed (because avail_in is + * reset above every time round the loop). + */ + input_len += png_ptr->zstream.avail_in; + png_ptr->zstream.avail_in = 0; /* safety */ } - else if (ret != Z_STREAM_END) + while (ret == Z_OK); + + /* There may be some space left in the last output buffer, this needs to + * be subtracted from output_len. + */ + output_len -= png_ptr->zstream.avail_out; + png_ptr->zstream.avail_out = 0; /* safety */ + comp->output_len = output_len; + + /* Now double check the output length, put in a custom message if it is + * too long. Otherwise ensure the z_stream::msg pointer is set to + * something. + */ + if (output_len + prefix_len >= PNG_UINT_31_MAX) { - /* We got an error */ - if (png_ptr->zstream.msg != NULL) - png_error(png_ptr, png_ptr->zstream.msg); - else - png_error(png_ptr, "zlib error"); + png_ptr->zstream.msg = PNGZ_MSG_CAST("compressed data too long"); + ret = Z_MEM_ERROR; } - } while (ret != Z_STREAM_END); - /* Text length is number of buffers plus last buffer */ - text_len = png_ptr->zbuf_size * comp->num_output_ptr; - if (png_ptr->zstream.avail_out < png_ptr->zbuf_size) - text_len += png_ptr->zbuf_size - (png_size_t)png_ptr->zstream.avail_out; + else + png_zstream_error(png_ptr, ret); - return((int)text_len); + /* Reset zlib for another zTXt/iTXt or image data */ + png_ptr->zowner = 0; + + /* The only success case is Z_STREAM_END, input_len must be 0, if not this + * is an internal error. + */ + if (ret == Z_STREAM_END && input_len == 0) + { + /* Fix up the deflate header, if required */ + optimize_cmf(comp->output, comp->input_len); + + /* But Z_OK is returned, not Z_STREAM_END; this allows the claim + * function above to return Z_STREAM_END on an error (though it never + * does in the current versions of zlib.) + */ + return Z_OK; + } + + else + return ret; + } } /* Ship the compressed text out via chunk writes */ -static void /* PRIVATE */ -png_write_compressed_data_out(png_structp png_ptr, compression_state *comp) +static void +png_write_compressed_data_out(png_structrp png_ptr, compression_state *comp) { - int i; + png_uint_32 output_len = comp->output_len; + png_const_bytep output = comp->output; + png_uint_32 avail = (sizeof comp->output); + png_compression_buffer *next = png_ptr->zbuffer_list; - /* Handle the no-compression case */ - if (comp->input) + for (;;) { - png_write_chunk_data(png_ptr, (png_bytep)comp->input, - (png_size_t)comp->input_len); - return; + if (avail > output_len) + avail = output_len; + + png_write_chunk_data(png_ptr, output, avail); + + output_len -= avail; + + if (output_len == 0 || next == NULL) + break; + + avail = png_ptr->zbuffer_size; + output = next->output; + next = next->next; } - /* Write saved output buffers, if any */ - for (i = 0; i < comp->num_output_ptr; i++) - { - png_write_chunk_data(png_ptr, (png_bytep)comp->output_ptr[i], - (png_size_t)png_ptr->zbuf_size); - png_free(png_ptr, comp->output_ptr[i]); - } - if (comp->max_output_ptr != 0) - png_free(png_ptr, comp->output_ptr); - /* Write anything left in zbuf */ - if (png_ptr->zstream.avail_out < (png_uint_32)png_ptr->zbuf_size) - png_write_chunk_data(png_ptr, png_ptr->zbuf, - (png_size_t)(png_ptr->zbuf_size - png_ptr->zstream.avail_out)); + /* This is an internal error; 'next' must have been NULL! */ + if (output_len > 0) + png_error(png_ptr, "error writing ancillary chunked compressed data"); +} +#endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */ - /* Reset zlib for another zTXt/iTXt or image data */ - deflateReset(&png_ptr->zstream); - png_ptr->zstream.data_type = Z_BINARY; +#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ + defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) +/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification, + * and if invalid, correct the keyword rather than discarding the entire + * chunk. The PNG 1.0 specification requires keywords 1-79 characters in + * length, forbids leading or trailing whitespace, multiple internal spaces, + * and the non-break space (0x80) from ISO 8859-1. Returns keyword length. + * + * The 'new_key' buffer must be 80 characters in size (for the keyword plus a + * trailing '\0'). If this routine returns 0 then there was no keyword, or a + * valid one could not be generated, and the caller must png_error. + */ +static png_uint_32 +png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key) +{ + png_const_charp orig_key = key; + png_uint_32 key_len = 0; + int bad_character = 0; + int space = 1; + + png_debug(1, "in png_check_keyword"); + + if (key == NULL) + { + *new_key = 0; + return 0; + } + + while (*key && key_len < 79) + { + png_byte ch = (png_byte)(0xff & *key++); + + if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/)) + *new_key++ = ch, ++key_len, space = 0; + + else if (!space) + { + /* A space or an invalid character when one wasn't seen immediately + * before; output just a space. + */ + *new_key++ = 32, ++key_len, space = 1; + + /* If the character was not a space then it is invalid. */ + if (ch != 32) + bad_character = ch; + } + + else if (!bad_character) + bad_character = ch; /* just skip it, record the first error */ + } + + if (key_len > 0 && space) /* trailing space */ + { + --key_len, --new_key; + if (!bad_character) + bad_character = 32; + } + + /* Terminate the keyword */ + *new_key = 0; + + if (key_len == 0) + return 0; + + /* Try to only output one warning per keyword: */ + if (*key) /* keyword too long */ + png_warning(png_ptr, "keyword truncated"); + + else if (bad_character) + { + PNG_WARNING_PARAMETERS(p) + + png_warning_parameter(p, 1, orig_key); + png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character); + + png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'"); + } + + return key_len; } #endif @@ -416,13 +751,10 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp) * information being correct. */ void /* PRIVATE */ -png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height, - int bit_depth, int color_type, int compression_type, int filter_type, - int interlace_type) +png_write_IHDR(png_structrp png_ptr, png_uint_32 width, png_uint_32 height, + int bit_depth, int color_type, int compression_type, int filter_type, + int interlace_type) { - PNG_IHDR; - int ret; - png_byte buf[13]; /* Buffer to store the IHDR info */ png_debug(1, "in png_write_IHDR"); @@ -437,36 +769,61 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height, case 2: case 4: case 8: - case 16: png_ptr->channels = 1; break; - default: png_error(png_ptr, - "Invalid bit depth for grayscale image"); +#ifdef PNG_WRITE_16BIT_SUPPORTED + case 16: +#endif + png_ptr->channels = 1; break; + + default: + png_error(png_ptr, + "Invalid bit depth for grayscale image"); } break; + case PNG_COLOR_TYPE_RGB: +#ifdef PNG_WRITE_16BIT_SUPPORTED if (bit_depth != 8 && bit_depth != 16) +#else + if (bit_depth != 8) +#endif png_error(png_ptr, "Invalid bit depth for RGB image"); + png_ptr->channels = 3; break; + case PNG_COLOR_TYPE_PALETTE: switch (bit_depth) { case 1: case 2: case 4: - case 8: png_ptr->channels = 1; break; - default: png_error(png_ptr, "Invalid bit depth for paletted image"); + case 8: + png_ptr->channels = 1; + break; + + default: + png_error(png_ptr, "Invalid bit depth for paletted image"); } break; + case PNG_COLOR_TYPE_GRAY_ALPHA: if (bit_depth != 8 && bit_depth != 16) png_error(png_ptr, "Invalid bit depth for grayscale+alpha image"); + png_ptr->channels = 2; break; + case PNG_COLOR_TYPE_RGB_ALPHA: +#ifdef PNG_WRITE_16BIT_SUPPORTED if (bit_depth != 8 && bit_depth != 16) +#else + if (bit_depth != 8) +#endif png_error(png_ptr, "Invalid bit depth for RGBA image"); + png_ptr->channels = 4; break; + default: png_error(png_ptr, "Invalid image color type specified"); } @@ -488,13 +845,13 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height, */ if ( #ifdef PNG_MNG_FEATURES_SUPPORTED - !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && - ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) && - (color_type == PNG_COLOR_TYPE_RGB || - color_type == PNG_COLOR_TYPE_RGB_ALPHA) && - (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) && + !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && + ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) && + (color_type == PNG_COLOR_TYPE_RGB || + color_type == PNG_COLOR_TYPE_RGB_ALPHA) && + (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) && #endif - filter_type != PNG_FILTER_TYPE_BASE) + filter_type != PNG_FILTER_TYPE_BASE) { png_warning(png_ptr, "Invalid filter type specified"); filter_type = PNG_FILTER_TYPE_BASE; @@ -502,7 +859,7 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height, #ifdef PNG_WRITE_INTERLACING_SUPPORTED if (interlace_type != PNG_INTERLACE_NONE && - interlace_type != PNG_INTERLACE_ADAM7) + interlace_type != PNG_INTERLACE_ADAM7) { png_warning(png_ptr, "Invalid interlace type specified"); interlace_type = PNG_INTERLACE_ADAM7; @@ -539,55 +896,19 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height, buf[12] = (png_byte)interlace_type; /* Write the chunk */ - png_write_chunk(png_ptr, (png_bytep)png_IHDR, buf, (png_size_t)13); + png_write_complete_chunk(png_ptr, png_IHDR, buf, (png_size_t)13); - /* Initialize zlib with PNG info */ - png_ptr->zstream.zalloc = png_zalloc; - png_ptr->zstream.zfree = png_zfree; - png_ptr->zstream.opaque = (voidpf)png_ptr; if (!(png_ptr->do_filter)) { if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE || - png_ptr->bit_depth < 8) + png_ptr->bit_depth < 8) png_ptr->do_filter = PNG_FILTER_NONE; + else png_ptr->do_filter = PNG_ALL_FILTERS; } - if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY)) - { - if (png_ptr->do_filter != PNG_FILTER_NONE) - png_ptr->zlib_strategy = Z_FILTERED; - else - png_ptr->zlib_strategy = Z_DEFAULT_STRATEGY; - } - if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_LEVEL)) - png_ptr->zlib_level = Z_DEFAULT_COMPRESSION; - if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL)) - png_ptr->zlib_mem_level = 8; - if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS)) - png_ptr->zlib_window_bits = 15; - if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_METHOD)) - png_ptr->zlib_method = 8; - ret = deflateInit2(&png_ptr->zstream, png_ptr->zlib_level, - png_ptr->zlib_method, png_ptr->zlib_window_bits, - png_ptr->zlib_mem_level, png_ptr->zlib_strategy); - if (ret != Z_OK) - { - if (ret == Z_VERSION_ERROR) png_error(png_ptr, - "zlib failed to initialize compressor -- version error"); - if (ret == Z_STREAM_ERROR) png_error(png_ptr, - "zlib failed to initialize compressor -- stream error"); - if (ret == Z_MEM_ERROR) png_error(png_ptr, - "zlib failed to initialize compressor -- mem error"); - png_error(png_ptr, "zlib failed to initialize compressor"); - } - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - /* libpng is not interested in zstream.data_type */ - /* Set it to a predefined value, to avoid its evaluation inside zlib */ - png_ptr->zstream.data_type = Z_BINARY; - png_ptr->mode = PNG_HAVE_IHDR; + png_ptr->mode = PNG_HAVE_IHDR; /* not READY_FOR_ZTXT */ } /* Write the palette. We are careful not to trust png_color to be in the @@ -595,45 +916,47 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height, * structure. */ void /* PRIVATE */ -png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal) +png_write_PLTE(png_structrp png_ptr, png_const_colorp palette, + png_uint_32 num_pal) { - PNG_PLTE; png_uint_32 i; - png_colorp pal_ptr; + png_const_colorp pal_ptr; png_byte buf[3]; png_debug(1, "in png_write_PLTE"); if (( #ifdef PNG_MNG_FEATURES_SUPPORTED - !(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) && + !(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) && #endif - num_pal == 0) || num_pal > 256) + num_pal == 0) || num_pal > 256) { - if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) - { - png_error(png_ptr, "Invalid number of colors in palette"); - } - else - { - png_warning(png_ptr, "Invalid number of colors in palette"); - return; - } + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + { + png_error(png_ptr, "Invalid number of colors in palette"); + } + + else + { + png_warning(png_ptr, "Invalid number of colors in palette"); + return; + } } if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR)) { png_warning(png_ptr, - "Ignoring request to write a PLTE chunk in grayscale PNG"); + "Ignoring request to write a PLTE chunk in grayscale PNG"); + return; } png_ptr->num_palette = (png_uint_16)num_pal; png_debug1(3, "num_palette = %d", png_ptr->num_palette); - png_write_chunk_start(png_ptr, (png_bytep)png_PLTE, - (png_uint_32)(num_pal * 3)); + png_write_chunk_header(png_ptr, png_PLTE, (png_uint_32)(num_pal * 3)); #ifdef PNG_POINTER_INDEXING_SUPPORTED + for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++) { buf[0] = pal_ptr->red; @@ -641,11 +964,13 @@ png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal) buf[2] = pal_ptr->blue; png_write_chunk_data(png_ptr, buf, (png_size_t)3); } + #else /* This is a little slower but some buggy compilers need to do this * instead */ pal_ptr=palette; + for (i = 0; i < num_pal; i++) { buf[0] = pal_ptr[i].red; @@ -653,216 +978,278 @@ png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal) buf[2] = pal_ptr[i].blue; png_write_chunk_data(png_ptr, buf, (png_size_t)3); } + #endif png_write_chunk_end(png_ptr); png_ptr->mode |= PNG_HAVE_PLTE; } -/* Write an IDAT chunk */ +/* This is similar to png_text_compress, above, except that it does not require + * all of the data at once and, instead of buffering the compressed result, + * writes it as IDAT chunks. Unlike png_text_compress it *can* png_error out + * because it calls the write interface. As a result it does its own error + * reporting and does not return an error code. In the event of error it will + * just call png_error. The input data length may exceed 32-bits. The 'flush' + * parameter is exactly the same as that to deflate, with the following + * meanings: + * + * Z_NO_FLUSH: normal incremental output of compressed data + * Z_SYNC_FLUSH: do a SYNC_FLUSH, used by png_write_flush + * Z_FINISH: this is the end of the input, do a Z_FINISH and clean up + * + * The routine manages the acquire and release of the png_ptr->zstream by + * checking and (at the end) clearing png_ptr->zowner, it does some sanity + * checks on the 'mode' flags while doing this. + */ void /* PRIVATE */ -png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length) +png_compress_IDAT(png_structrp png_ptr, png_const_bytep input, + png_alloc_size_t input_len, int flush) { - PNG_IDAT; - - png_debug(1, "in png_write_IDAT"); - - /* Optimize the CMF field in the zlib stream. */ - /* This hack of the zlib stream is compliant to the stream specification. */ - if (!(png_ptr->mode & PNG_HAVE_IDAT) && - png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE) + if (png_ptr->zowner != png_IDAT) { - unsigned int z_cmf = data[0]; /* zlib compression method and flags */ - if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70) + /* First time. Ensure we have a temporary buffer for compression and + * trim the buffer list if it has more than one entry to free memory. + * If 'WRITE_COMPRESSED_TEXT' is not set the list will never have been + * created at this point, but the check here is quick and safe. + */ + if (png_ptr->zbuffer_list == NULL) { - /* Avoid memory underflows and multiplication overflows. - * - * The conditions below are practically always satisfied; - * however, they still must be checked. - */ - if (length >= 2 && - png_ptr->height < 16384 && png_ptr->width < 16384) - { - png_uint_32 uncompressed_idat_size = png_ptr->height * - ((png_ptr->width * - png_ptr->channels * png_ptr->bit_depth + 15) >> 3); - unsigned int z_cinfo = z_cmf >> 4; - unsigned int half_z_window_size = 1 << (z_cinfo + 7); - while (uncompressed_idat_size <= half_z_window_size && - half_z_window_size >= 256) - { - z_cinfo--; - half_z_window_size >>= 1; - } - z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4); - if (data[0] != (png_byte)z_cmf) - { - data[0] = (png_byte)z_cmf; - data[1] &= 0xe0; - data[1] += (png_byte)(0x1f - ((z_cmf << 8) + data[1]) % 0x1f); - } - } + png_ptr->zbuffer_list = png_voidcast(png_compression_bufferp, + png_malloc(png_ptr, PNG_COMPRESSION_BUFFER_SIZE(png_ptr))); + png_ptr->zbuffer_list->next = NULL; } + else - png_error(png_ptr, - "Invalid zlib compression method or flags in IDAT"); + png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list->next); + + /* It is a terminal error if we can't claim the zstream. */ + if (png_deflate_claim(png_ptr, png_IDAT, png_image_size(png_ptr)) != Z_OK) + png_error(png_ptr, png_ptr->zstream.msg); + + /* The output state is maintained in png_ptr->zstream, so it must be + * initialized here after the claim. + */ + png_ptr->zstream.next_out = png_ptr->zbuffer_list->output; + png_ptr->zstream.avail_out = png_ptr->zbuffer_size; } - png_write_chunk(png_ptr, (png_bytep)png_IDAT, data, length); - png_ptr->mode |= PNG_HAVE_IDAT; + /* Now loop reading and writing until all the input is consumed or an error + * terminates the operation. The _out values are maintained across calls to + * this function, but the input must be reset each time. + */ + png_ptr->zstream.next_in = PNGZ_INPUT_CAST(input); + png_ptr->zstream.avail_in = 0; /* set below */ + for (;;) + { + int ret; + + /* INPUT: from the row data */ + uInt avail = ZLIB_IO_MAX; + + if (avail > input_len) + avail = (uInt)input_len; /* safe because of the check */ + + png_ptr->zstream.avail_in = avail; + input_len -= avail; + + ret = deflate(&png_ptr->zstream, input_len > 0 ? Z_NO_FLUSH : flush); + + /* Include as-yet unconsumed input */ + input_len += png_ptr->zstream.avail_in; + png_ptr->zstream.avail_in = 0; + + /* OUTPUT: write complete IDAT chunks when avail_out drops to zero, note + * that these two zstream fields are preserved across the calls, therefore + * there is no need to set these up on entry to the loop. + */ + if (png_ptr->zstream.avail_out == 0) + { + png_bytep data = png_ptr->zbuffer_list->output; + uInt size = png_ptr->zbuffer_size; + + /* Write an IDAT containing the data then reset the buffer. The + * first IDAT may need deflate header optimization. + */ +# ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED + if (!(png_ptr->mode & PNG_HAVE_IDAT) && + png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE) + optimize_cmf(data, png_image_size(png_ptr)); +# endif + + png_write_complete_chunk(png_ptr, png_IDAT, data, size); + png_ptr->mode |= PNG_HAVE_IDAT; + + png_ptr->zstream.next_out = data; + png_ptr->zstream.avail_out = size; + + /* For SYNC_FLUSH or FINISH it is essential to keep calling zlib with + * the same flush parameter until it has finished output, for NO_FLUSH + * it doesn't matter. + */ + if (ret == Z_OK && flush != Z_NO_FLUSH) + continue; + } + + /* The order of these checks doesn't matter much; it just effect which + * possible error might be detected if multiple things go wrong at once. + */ + if (ret == Z_OK) /* most likely return code! */ + { + /* If all the input has been consumed then just return. If Z_FINISH + * was used as the flush parameter something has gone wrong if we get + * here. + */ + if (input_len == 0) + { + if (flush == Z_FINISH) + png_error(png_ptr, "Z_OK on Z_FINISH with output space"); + + return; + } + } + + else if (ret == Z_STREAM_END && flush == Z_FINISH) + { + /* This is the end of the IDAT data; any pending output must be + * flushed. For small PNG files we may still be at the beginning. + */ + png_bytep data = png_ptr->zbuffer_list->output; + uInt size = png_ptr->zbuffer_size - png_ptr->zstream.avail_out; + +# ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED + if (!(png_ptr->mode & PNG_HAVE_IDAT) && + png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE) + optimize_cmf(data, png_image_size(png_ptr)); +# endif + + png_write_complete_chunk(png_ptr, png_IDAT, data, size); + png_ptr->zstream.avail_out = 0; + png_ptr->zstream.next_out = NULL; + png_ptr->mode |= PNG_HAVE_IDAT | PNG_AFTER_IDAT; + + png_ptr->zowner = 0; /* Release the stream */ + return; + } + + else + { + /* This is an error condition. */ + png_zstream_error(png_ptr, ret); + png_error(png_ptr, png_ptr->zstream.msg); + } + } } /* Write an IEND chunk */ void /* PRIVATE */ -png_write_IEND(png_structp png_ptr) +png_write_IEND(png_structrp png_ptr) { - PNG_IEND; - png_debug(1, "in png_write_IEND"); - png_write_chunk(png_ptr, (png_bytep)png_IEND, NULL, - (png_size_t)0); + png_write_complete_chunk(png_ptr, png_IEND, NULL, (png_size_t)0); png_ptr->mode |= PNG_HAVE_IEND; } #ifdef PNG_WRITE_gAMA_SUPPORTED /* Write a gAMA chunk */ -#ifdef PNG_FLOATING_POINT_SUPPORTED void /* PRIVATE */ -png_write_gAMA(png_structp png_ptr, double file_gamma) +png_write_gAMA_fixed(png_structrp png_ptr, png_fixed_point file_gamma) { - PNG_gAMA; - png_uint_32 igamma; - png_byte buf[4]; - - png_debug(1, "in png_write_gAMA"); - - /* file_gamma is saved in 1/100,000ths */ - igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5); - png_save_uint_32(buf, igamma); - png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4); -} -#endif -#ifdef PNG_FIXED_POINT_SUPPORTED -void /* PRIVATE */ -png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma) -{ - PNG_gAMA; png_byte buf[4]; png_debug(1, "in png_write_gAMA"); /* file_gamma is saved in 1/100,000ths */ png_save_uint_32(buf, (png_uint_32)file_gamma); - png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4); + png_write_complete_chunk(png_ptr, png_gAMA, buf, (png_size_t)4); } #endif -#endif #ifdef PNG_WRITE_sRGB_SUPPORTED /* Write a sRGB chunk */ void /* PRIVATE */ -png_write_sRGB(png_structp png_ptr, int srgb_intent) +png_write_sRGB(png_structrp png_ptr, int srgb_intent) { - PNG_sRGB; png_byte buf[1]; png_debug(1, "in png_write_sRGB"); if (srgb_intent >= PNG_sRGB_INTENT_LAST) - png_warning(png_ptr, - "Invalid sRGB rendering intent specified"); + png_warning(png_ptr, + "Invalid sRGB rendering intent specified"); + buf[0]=(png_byte)srgb_intent; - png_write_chunk(png_ptr, (png_bytep)png_sRGB, buf, (png_size_t)1); + png_write_complete_chunk(png_ptr, png_sRGB, buf, (png_size_t)1); } #endif #ifdef PNG_WRITE_iCCP_SUPPORTED /* Write an iCCP chunk */ void /* PRIVATE */ -png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type, - png_charp profile, int profile_len) +png_write_iCCP(png_structrp png_ptr, png_const_charp name, + png_const_bytep profile) { - PNG_iCCP; - png_size_t name_len; - png_charp new_name; + png_uint_32 name_len; + png_uint_32 profile_len; + png_byte new_name[81]; /* 1 byte for the compression byte */ compression_state comp; - int embedded_profile_len = 0; png_debug(1, "in png_write_iCCP"); - comp.num_output_ptr = 0; - comp.max_output_ptr = 0; - comp.output_ptr = NULL; - comp.input = NULL; - comp.input_len = 0; - - if ((name_len = png_check_keyword(png_ptr, name, - &new_name)) == 0) - return; - - if (compression_type != PNG_COMPRESSION_TYPE_BASE) - png_warning(png_ptr, "Unknown compression type in iCCP chunk"); - + /* These are all internal problems: the profile should have been checked + * before when it was stored. + */ if (profile == NULL) - profile_len = 0; + png_error(png_ptr, "No profile for iCCP chunk"); /* internal error */ - if (profile_len > 3) - embedded_profile_len = - ((*( (png_bytep)profile ))<<24) | - ((*( (png_bytep)profile + 1))<<16) | - ((*( (png_bytep)profile + 2))<< 8) | - ((*( (png_bytep)profile + 3)) ); + profile_len = png_get_uint_32(profile); + + if (profile_len < 132) + png_error(png_ptr, "ICC profile too short"); + + if (profile_len & 0x03) + png_error(png_ptr, "ICC profile length invalid (not a multiple of 4)"); - if (embedded_profile_len < 0) { - png_warning(png_ptr, - "Embedded profile length in iCCP chunk is negative"); - png_free(png_ptr, new_name); - return; + png_uint_32 embedded_profile_len = png_get_uint_32(profile); + + if (profile_len != embedded_profile_len) + png_error(png_ptr, "Profile length does not match profile"); } - if (profile_len < embedded_profile_len) - { - png_warning(png_ptr, - "Embedded profile length too large in iCCP chunk"); - png_free(png_ptr, new_name); - return; - } + name_len = png_check_keyword(png_ptr, name, new_name); - if (profile_len > embedded_profile_len) - { - png_warning(png_ptr, - "Truncating profile to actual length in iCCP chunk"); - profile_len = embedded_profile_len; - } + if (name_len == 0) + png_error(png_ptr, "iCCP: invalid keyword"); - if (profile_len) - profile_len = png_text_compress(png_ptr, profile, - (png_size_t)profile_len, PNG_COMPRESSION_TYPE_BASE, &comp); + new_name[++name_len] = PNG_COMPRESSION_TYPE_BASE; /* Make sure we include the NULL after the name and the compression type */ - png_write_chunk_start(png_ptr, (png_bytep)png_iCCP, - (png_uint_32)(name_len + profile_len + 2)); - new_name[name_len + 1] = 0x00; - png_write_chunk_data(png_ptr, (png_bytep)new_name, - (png_size_t)(name_len + 2)); + ++name_len; - if (profile_len) - png_write_compressed_data_out(png_ptr, &comp); + png_text_compress_init(&comp, profile, profile_len); + + /* Allow for keyword terminator and compression byte */ + if (png_text_compress(png_ptr, png_iCCP, &comp, name_len) != Z_OK) + png_error(png_ptr, png_ptr->zstream.msg); + + png_write_chunk_header(png_ptr, png_iCCP, name_len + comp.output_len); + + png_write_chunk_data(png_ptr, new_name, name_len); + + png_write_compressed_data_out(png_ptr, &comp); png_write_chunk_end(png_ptr); - png_free(png_ptr, new_name); } #endif #ifdef PNG_WRITE_sPLT_SUPPORTED /* Write a sPLT chunk */ void /* PRIVATE */ -png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette) +png_write_sPLT(png_structrp png_ptr, png_const_sPLT_tp spalette) { - PNG_sPLT; - png_size_t name_len; - png_charp new_name; + png_uint_32 name_len; + png_byte new_name[80]; png_byte entrybuf[10]; png_size_t entry_size = (spalette->depth == 8 ? 6 : 10); png_size_t palette_size = entry_size * spalette->nentries; @@ -873,15 +1260,19 @@ png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette) png_debug(1, "in png_write_sPLT"); - if ((name_len = png_check_keyword(png_ptr,spalette->name, &new_name))==0) - return; + name_len = png_check_keyword(png_ptr, spalette->name, new_name); + + if (name_len == 0) + png_error(png_ptr, "sPLT: invalid keyword"); /* Make sure we include the NULL after the name */ - png_write_chunk_start(png_ptr, (png_bytep)png_sPLT, - (png_uint_32)(name_len + 2 + palette_size)); + png_write_chunk_header(png_ptr, png_sPLT, + (png_uint_32)(name_len + 2 + palette_size)); + png_write_chunk_data(png_ptr, (png_bytep)new_name, - (png_size_t)(name_len + 1)); - png_write_chunk_data(png_ptr, (png_bytep)&spalette->depth, (png_size_t)1); + (png_size_t)(name_len + 1)); + + png_write_chunk_data(png_ptr, &spalette->depth, (png_size_t)1); /* Loop through each palette entry, writing appropriately */ #ifdef PNG_POINTER_INDEXING_SUPPORTED @@ -889,57 +1280,59 @@ png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette) { if (spalette->depth == 8) { - entrybuf[0] = (png_byte)ep->red; - entrybuf[1] = (png_byte)ep->green; - entrybuf[2] = (png_byte)ep->blue; - entrybuf[3] = (png_byte)ep->alpha; - png_save_uint_16(entrybuf + 4, ep->frequency); + entrybuf[0] = (png_byte)ep->red; + entrybuf[1] = (png_byte)ep->green; + entrybuf[2] = (png_byte)ep->blue; + entrybuf[3] = (png_byte)ep->alpha; + png_save_uint_16(entrybuf + 4, ep->frequency); } + else { - png_save_uint_16(entrybuf + 0, ep->red); - png_save_uint_16(entrybuf + 2, ep->green); - png_save_uint_16(entrybuf + 4, ep->blue); - png_save_uint_16(entrybuf + 6, ep->alpha); - png_save_uint_16(entrybuf + 8, ep->frequency); + png_save_uint_16(entrybuf + 0, ep->red); + png_save_uint_16(entrybuf + 2, ep->green); + png_save_uint_16(entrybuf + 4, ep->blue); + png_save_uint_16(entrybuf + 6, ep->alpha); + png_save_uint_16(entrybuf + 8, ep->frequency); } - png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size); + + png_write_chunk_data(png_ptr, entrybuf, entry_size); } #else ep=spalette->entries; - for (i=0; i>spalette->nentries; i++) + for (i = 0; i>spalette->nentries; i++) { if (spalette->depth == 8) { - entrybuf[0] = (png_byte)ep[i].red; - entrybuf[1] = (png_byte)ep[i].green; - entrybuf[2] = (png_byte)ep[i].blue; - entrybuf[3] = (png_byte)ep[i].alpha; - png_save_uint_16(entrybuf + 4, ep[i].frequency); + entrybuf[0] = (png_byte)ep[i].red; + entrybuf[1] = (png_byte)ep[i].green; + entrybuf[2] = (png_byte)ep[i].blue; + entrybuf[3] = (png_byte)ep[i].alpha; + png_save_uint_16(entrybuf + 4, ep[i].frequency); } + else { - png_save_uint_16(entrybuf + 0, ep[i].red); - png_save_uint_16(entrybuf + 2, ep[i].green); - png_save_uint_16(entrybuf + 4, ep[i].blue); - png_save_uint_16(entrybuf + 6, ep[i].alpha); - png_save_uint_16(entrybuf + 8, ep[i].frequency); + png_save_uint_16(entrybuf + 0, ep[i].red); + png_save_uint_16(entrybuf + 2, ep[i].green); + png_save_uint_16(entrybuf + 4, ep[i].blue); + png_save_uint_16(entrybuf + 6, ep[i].alpha); + png_save_uint_16(entrybuf + 8, ep[i].frequency); } - png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size); + + png_write_chunk_data(png_ptr, entrybuf, entry_size); } #endif png_write_chunk_end(png_ptr); - png_free(png_ptr, new_name); } #endif #ifdef PNG_WRITE_sBIT_SUPPORTED /* Write the sBIT chunk */ void /* PRIVATE */ -png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type) +png_write_sBIT(png_structrp png_ptr, png_const_color_8p sbit, int color_type) { - PNG_sBIT; png_byte buf[4]; png_size_t size; @@ -951,7 +1344,8 @@ png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type) png_byte maxbits; maxbits = (png_byte)(color_type==PNG_COLOR_TYPE_PALETTE ? 8 : - png_ptr->usr_bit_depth); + png_ptr->usr_bit_depth); + if (sbit->red == 0 || sbit->red > maxbits || sbit->green == 0 || sbit->green > maxbits || sbit->blue == 0 || sbit->blue > maxbits) @@ -959,11 +1353,13 @@ png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type) png_warning(png_ptr, "Invalid sBIT depth specified"); return; } + buf[0] = sbit->red; buf[1] = sbit->green; buf[2] = sbit->blue; size = 3; } + else { if (sbit->gray == 0 || sbit->gray > png_ptr->usr_bit_depth) @@ -971,6 +1367,7 @@ png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type) png_warning(png_ptr, "Invalid sBIT depth specified"); return; } + buf[0] = sbit->gray; size = 1; } @@ -982,104 +1379,46 @@ png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type) png_warning(png_ptr, "Invalid sBIT depth specified"); return; } + buf[size++] = sbit->alpha; } - png_write_chunk(png_ptr, (png_bytep)png_sBIT, buf, size); + png_write_complete_chunk(png_ptr, png_sBIT, buf, size); } #endif #ifdef PNG_WRITE_cHRM_SUPPORTED /* Write the cHRM chunk */ -#ifdef PNG_FLOATING_POINT_SUPPORTED void /* PRIVATE */ -png_write_cHRM(png_structp png_ptr, double white_x, double white_y, - double red_x, double red_y, double green_x, double green_y, - double blue_x, double blue_y) +png_write_cHRM_fixed(png_structrp png_ptr, const png_xy *xy) { - PNG_cHRM; - png_byte buf[32]; - - png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, - int_green_x, int_green_y, int_blue_x, int_blue_y; - - png_debug(1, "in png_write_cHRM"); - - int_white_x = (png_uint_32)(white_x * 100000.0 + 0.5); - int_white_y = (png_uint_32)(white_y * 100000.0 + 0.5); - int_red_x = (png_uint_32)(red_x * 100000.0 + 0.5); - int_red_y = (png_uint_32)(red_y * 100000.0 + 0.5); - int_green_x = (png_uint_32)(green_x * 100000.0 + 0.5); - int_green_y = (png_uint_32)(green_y * 100000.0 + 0.5); - int_blue_x = (png_uint_32)(blue_x * 100000.0 + 0.5); - int_blue_y = (png_uint_32)(blue_y * 100000.0 + 0.5); - -#ifdef PNG_CHECK_cHRM_SUPPORTED - if (png_check_cHRM_fixed(png_ptr, int_white_x, int_white_y, - int_red_x, int_red_y, int_green_x, int_green_y, int_blue_x, int_blue_y)) -#endif - { - /* Each value is saved in 1/100,000ths */ - - png_save_uint_32(buf, int_white_x); - png_save_uint_32(buf + 4, int_white_y); - - png_save_uint_32(buf + 8, int_red_x); - png_save_uint_32(buf + 12, int_red_y); - - png_save_uint_32(buf + 16, int_green_x); - png_save_uint_32(buf + 20, int_green_y); - - png_save_uint_32(buf + 24, int_blue_x); - png_save_uint_32(buf + 28, int_blue_y); - - png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32); - } -} -#endif -#ifdef PNG_FIXED_POINT_SUPPORTED -void /* PRIVATE */ -png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x, - png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y, - png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x, - png_fixed_point blue_y) -{ - PNG_cHRM; png_byte buf[32]; png_debug(1, "in png_write_cHRM"); /* Each value is saved in 1/100,000ths */ -#ifdef PNG_CHECK_cHRM_SUPPORTED - if (png_check_cHRM_fixed(png_ptr, white_x, white_y, red_x, red_y, - green_x, green_y, blue_x, blue_y)) -#endif - { - png_save_uint_32(buf, (png_uint_32)white_x); - png_save_uint_32(buf + 4, (png_uint_32)white_y); + png_save_int_32(buf, xy->whitex); + png_save_int_32(buf + 4, xy->whitey); - png_save_uint_32(buf + 8, (png_uint_32)red_x); - png_save_uint_32(buf + 12, (png_uint_32)red_y); + png_save_int_32(buf + 8, xy->redx); + png_save_int_32(buf + 12, xy->redy); - png_save_uint_32(buf + 16, (png_uint_32)green_x); - png_save_uint_32(buf + 20, (png_uint_32)green_y); + png_save_int_32(buf + 16, xy->greenx); + png_save_int_32(buf + 20, xy->greeny); - png_save_uint_32(buf + 24, (png_uint_32)blue_x); - png_save_uint_32(buf + 28, (png_uint_32)blue_y); + png_save_int_32(buf + 24, xy->bluex); + png_save_int_32(buf + 28, xy->bluey); - png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32); - } + png_write_complete_chunk(png_ptr, png_cHRM, buf, 32); } #endif -#endif #ifdef PNG_WRITE_tRNS_SUPPORTED /* Write the tRNS chunk */ void /* PRIVATE */ -png_write_tRNS(png_structp png_ptr, png_bytep trans_alpha, png_color_16p tran, - int num_trans, int color_type) +png_write_tRNS(png_structrp png_ptr, png_const_bytep trans_alpha, + png_const_color_16p tran, int num_trans, int color_type) { - PNG_tRNS; png_byte buf[6]; png_debug(1, "in png_write_tRNS"); @@ -1088,42 +1427,54 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans_alpha, png_color_16p tran, { if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette) { - png_warning(png_ptr, "Invalid number of transparent colors specified"); + png_app_warning(png_ptr, + "Invalid number of transparent colors specified"); return; } + /* Write the chunk out as it is */ - png_write_chunk(png_ptr, (png_bytep)png_tRNS, trans_alpha, - (png_size_t)num_trans); + png_write_complete_chunk(png_ptr, png_tRNS, trans_alpha, + (png_size_t)num_trans); } + else if (color_type == PNG_COLOR_TYPE_GRAY) { /* One 16 bit value */ if (tran->gray >= (1 << png_ptr->bit_depth)) { - png_warning(png_ptr, - "Ignoring attempt to write tRNS chunk out-of-range for bit_depth"); + png_app_warning(png_ptr, + "Ignoring attempt to write tRNS chunk out-of-range for bit_depth"); + return; } + png_save_uint_16(buf, tran->gray); - png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)2); + png_write_complete_chunk(png_ptr, png_tRNS, buf, (png_size_t)2); } + else if (color_type == PNG_COLOR_TYPE_RGB) { /* Three 16 bit values */ png_save_uint_16(buf, tran->red); png_save_uint_16(buf + 2, tran->green); png_save_uint_16(buf + 4, tran->blue); +#ifdef PNG_WRITE_16BIT_SUPPORTED if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4])) +#else + if (buf[0] | buf[2] | buf[4]) +#endif { - png_warning(png_ptr, + png_app_warning(png_ptr, "Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8"); return; } - png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)6); + + png_write_complete_chunk(png_ptr, png_tRNS, buf, (png_size_t)6); } + else { - png_warning(png_ptr, "Can't write tRNS with an alpha channel"); + png_app_warning(png_ptr, "Can't write tRNS with an alpha channel"); } } #endif @@ -1131,9 +1482,8 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans_alpha, png_color_16p tran, #ifdef PNG_WRITE_bKGD_SUPPORTED /* Write the background chunk */ void /* PRIVATE */ -png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type) +png_write_bKGD(png_structrp png_ptr, png_const_color_16p back, int color_type) { - PNG_bKGD; png_byte buf[6]; png_debug(1, "in png_write_bKGD"); @@ -1150,32 +1500,43 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type) png_warning(png_ptr, "Invalid background palette index"); return; } + buf[0] = back->index; - png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)1); + png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)1); } + else if (color_type & PNG_COLOR_MASK_COLOR) { png_save_uint_16(buf, back->red); png_save_uint_16(buf + 2, back->green); png_save_uint_16(buf + 4, back->blue); +#ifdef PNG_WRITE_16BIT_SUPPORTED if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4])) +#else + if (buf[0] | buf[2] | buf[4]) +#endif { png_warning(png_ptr, - "Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8"); + "Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8"); + return; } - png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)6); + + png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)6); } + else { if (back->gray >= (1 << png_ptr->bit_depth)) { png_warning(png_ptr, - "Ignoring attempt to write bKGD chunk out-of-range for bit_depth"); + "Ignoring attempt to write bKGD chunk out-of-range for bit_depth"); + return; } + png_save_uint_16(buf, back->gray); - png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)2); + png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)2); } } #endif @@ -1183,9 +1544,8 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type) #ifdef PNG_WRITE_hIST_SUPPORTED /* Write the histogram */ void /* PRIVATE */ -png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist) +png_write_hIST(png_structrp png_ptr, png_const_uint_16p hist, int num_hist) { - PNG_hIST; int i; png_byte buf[3]; @@ -1194,242 +1554,111 @@ png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist) if (num_hist > (int)png_ptr->num_palette) { png_debug2(3, "num_hist = %d, num_palette = %d", num_hist, - png_ptr->num_palette); + png_ptr->num_palette); + png_warning(png_ptr, "Invalid number of histogram entries specified"); return; } - png_write_chunk_start(png_ptr, (png_bytep)png_hIST, - (png_uint_32)(num_hist * 2)); + png_write_chunk_header(png_ptr, png_hIST, (png_uint_32)(num_hist * 2)); + for (i = 0; i < num_hist; i++) { png_save_uint_16(buf, hist[i]); png_write_chunk_data(png_ptr, buf, (png_size_t)2); } + png_write_chunk_end(png_ptr); } #endif -#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ - defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) -/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification, - * and if invalid, correct the keyword rather than discarding the entire - * chunk. The PNG 1.0 specification requires keywords 1-79 characters in - * length, forbids leading or trailing whitespace, multiple internal spaces, - * and the non-break space (0x80) from ISO 8859-1. Returns keyword length. - * - * The new_key is allocated to hold the corrected keyword and must be freed - * by the calling routine. This avoids problems with trying to write to - * static keywords without having to have duplicate copies of the strings. - */ -png_size_t /* PRIVATE */ -png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key) -{ - png_size_t key_len; - png_charp kp, dp; - int kflag; - int kwarn=0; - - png_debug(1, "in png_check_keyword"); - - *new_key = NULL; - - if (key == NULL || (key_len = png_strlen(key)) == 0) - { - png_warning(png_ptr, "zero length keyword"); - return ((png_size_t)0); - } - - png_debug1(2, "Keyword to be checked is '%s'", key); - - *new_key = (png_charp)png_malloc_warn(png_ptr, (png_uint_32)(key_len + 2)); - if (*new_key == NULL) - { - png_warning(png_ptr, "Out of memory while procesing keyword"); - return ((png_size_t)0); - } - - /* Replace non-printing characters with a blank and print a warning */ - for (kp = key, dp = *new_key; *kp != '\0'; kp++, dp++) - { - if ((png_byte)*kp < 0x20 || - ((png_byte)*kp > 0x7E && (png_byte)*kp < 0xA1)) - { -#ifdef PNG_STDIO_SUPPORTED - char msg[40]; - - png_snprintf(msg, 40, - "invalid keyword character 0x%02X", (png_byte)*kp); - png_warning(png_ptr, msg); -#else - png_warning(png_ptr, "invalid character in keyword"); -#endif - *dp = ' '; - } - else - { - *dp = *kp; - } - } - *dp = '\0'; - - /* Remove any trailing white space. */ - kp = *new_key + key_len - 1; - if (*kp == ' ') - { - png_warning(png_ptr, "trailing spaces removed from keyword"); - - while (*kp == ' ') - { - *(kp--) = '\0'; - key_len--; - } - } - - /* Remove any leading white space. */ - kp = *new_key; - if (*kp == ' ') - { - png_warning(png_ptr, "leading spaces removed from keyword"); - - while (*kp == ' ') - { - kp++; - key_len--; - } - } - - png_debug1(2, "Checking for multiple internal spaces in '%s'", kp); - - /* Remove multiple internal spaces. */ - for (kflag = 0, dp = *new_key; *kp != '\0'; kp++) - { - if (*kp == ' ' && kflag == 0) - { - *(dp++) = *kp; - kflag = 1; - } - else if (*kp == ' ') - { - key_len--; - kwarn=1; - } - else - { - *(dp++) = *kp; - kflag = 0; - } - } - *dp = '\0'; - if (kwarn) - png_warning(png_ptr, "extra interior spaces removed from keyword"); - - if (key_len == 0) - { - png_free(png_ptr, *new_key); - png_warning(png_ptr, "Zero length keyword"); - } - - if (key_len > 79) - { - png_warning(png_ptr, "keyword length must be 1 - 79 characters"); - (*new_key)[79] = '\0'; - key_len = 79; - } - - return (key_len); -} -#endif - #ifdef PNG_WRITE_tEXt_SUPPORTED /* Write a tEXt chunk */ void /* PRIVATE */ -png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text, - png_size_t text_len) +png_write_tEXt(png_structrp png_ptr, png_const_charp key, png_const_charp text, + png_size_t text_len) { - PNG_tEXt; - png_size_t key_len; - png_charp new_key; + png_uint_32 key_len; + png_byte new_key[80]; png_debug(1, "in png_write_tEXt"); - if ((key_len = png_check_keyword(png_ptr, key, &new_key))==0) - return; + key_len = png_check_keyword(png_ptr, key, new_key); + + if (key_len == 0) + png_error(png_ptr, "tEXt: invalid keyword"); if (text == NULL || *text == '\0') text_len = 0; + else - text_len = png_strlen(text); + text_len = strlen(text); + + if (text_len > PNG_UINT_31_MAX - (key_len+1)) + png_error(png_ptr, "tEXt: text too long"); /* Make sure we include the 0 after the key */ - png_write_chunk_start(png_ptr, (png_bytep)png_tEXt, - (png_uint_32)(key_len + text_len + 1)); + png_write_chunk_header(png_ptr, png_tEXt, + (png_uint_32)/*checked above*/(key_len + text_len + 1)); /* * We leave it to the application to meet PNG-1.0 requirements on the * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them. * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. */ - png_write_chunk_data(png_ptr, (png_bytep)new_key, - (png_size_t)(key_len + 1)); + png_write_chunk_data(png_ptr, new_key, key_len + 1); + if (text_len) - png_write_chunk_data(png_ptr, (png_bytep)text, (png_size_t)text_len); + png_write_chunk_data(png_ptr, (png_const_bytep)text, text_len); png_write_chunk_end(png_ptr); - png_free(png_ptr, new_key); } #endif #ifdef PNG_WRITE_zTXt_SUPPORTED /* Write a compressed text chunk */ void /* PRIVATE */ -png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text, - png_size_t text_len, int compression) +png_write_zTXt(png_structrp png_ptr, png_const_charp key, png_const_charp text, + png_size_t text_len, int compression) { - PNG_zTXt; - png_size_t key_len; - char buf[1]; - png_charp new_key; + png_uint_32 key_len; + png_byte new_key[81]; compression_state comp; png_debug(1, "in png_write_zTXt"); + PNG_UNUSED(text_len) /* Always use strlen */ - comp.num_output_ptr = 0; - comp.max_output_ptr = 0; - comp.output_ptr = NULL; - comp.input = NULL; - comp.input_len = 0; - - if ((key_len = png_check_keyword(png_ptr, key, &new_key))==0) + if (compression == PNG_TEXT_COMPRESSION_NONE) { - png_free(png_ptr, new_key); + png_write_tEXt(png_ptr, key, text, 0); return; } - if (text == NULL || *text == '\0' || compression==PNG_TEXT_COMPRESSION_NONE) - { - png_write_tEXt(png_ptr, new_key, text, (png_size_t)0); - png_free(png_ptr, new_key); - return; - } + if (compression != PNG_TEXT_COMPRESSION_zTXt) + png_error(png_ptr, "zTXt: invalid compression type"); - text_len = png_strlen(text); + key_len = png_check_keyword(png_ptr, key, new_key); + + if (key_len == 0) + png_error(png_ptr, "zTXt: invalid keyword"); + + /* Add the compression method and 1 for the keyword separator. */ + new_key[++key_len] = PNG_COMPRESSION_TYPE_BASE; + ++key_len; /* Compute the compressed data; do it now for the length */ - text_len = png_text_compress(png_ptr, text, text_len, compression, - &comp); + png_text_compress_init(&comp, (png_const_bytep)text, + text == NULL ? 0 : strlen(text)); + + if (png_text_compress(png_ptr, png_zTXt, &comp, key_len) != Z_OK) + png_error(png_ptr, png_ptr->zstream.msg); /* Write start of chunk */ - png_write_chunk_start(png_ptr, (png_bytep)png_zTXt, - (png_uint_32)(key_len+text_len + 2)); - /* Write key */ - png_write_chunk_data(png_ptr, (png_bytep)new_key, - (png_size_t)(key_len + 1)); - png_free(png_ptr, new_key); + png_write_chunk_header(png_ptr, png_zTXt, key_len + comp.output_len); + + /* Write key */ + png_write_chunk_data(png_ptr, new_key, key_len); - buf[0] = (png_byte)compression; - /* Write compression */ - png_write_chunk_data(png_ptr, (png_bytep)buf, (png_size_t)1); /* Write the compressed data */ png_write_compressed_data_out(png_ptr, &comp); @@ -1441,97 +1670,109 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text, #ifdef PNG_WRITE_iTXt_SUPPORTED /* Write an iTXt chunk */ void /* PRIVATE */ -png_write_iTXt(png_structp png_ptr, int compression, png_charp key, - png_charp lang, png_charp lang_key, png_charp text) +png_write_iTXt(png_structrp png_ptr, int compression, png_const_charp key, + png_const_charp lang, png_const_charp lang_key, png_const_charp text) { - PNG_iTXt; - png_size_t lang_len, key_len, lang_key_len, text_len; - png_charp new_lang; - png_charp new_key = NULL; - png_byte cbuf[2]; + png_uint_32 key_len, prefix_len; + png_size_t lang_len, lang_key_len; + png_byte new_key[82]; compression_state comp; png_debug(1, "in png_write_iTXt"); - comp.num_output_ptr = 0; - comp.max_output_ptr = 0; - comp.output_ptr = NULL; - comp.input = NULL; + key_len = png_check_keyword(png_ptr, key, new_key); - if ((key_len = png_check_keyword(png_ptr, key, &new_key))==0) - return; + if (key_len == 0) + png_error(png_ptr, "iTXt: invalid keyword"); - if ((lang_len = png_check_keyword(png_ptr, lang, &new_lang))==0) + /* Set the compression flag */ + switch (compression) { - png_warning(png_ptr, "Empty language field in iTXt chunk"); - new_lang = NULL; - lang_len = 0; + case PNG_ITXT_COMPRESSION_NONE: + case PNG_TEXT_COMPRESSION_NONE: + compression = new_key[++key_len] = 0; /* no compression */ + break; + + case PNG_TEXT_COMPRESSION_zTXt: + case PNG_ITXT_COMPRESSION_zTXt: + compression = new_key[++key_len] = 1; /* compressed */ + break; + + default: + png_error(png_ptr, "iTXt: invalid compression"); } - if (lang_key == NULL) - lang_key_len = 0; - else - lang_key_len = png_strlen(lang_key); - - if (text == NULL) - text_len = 0; - else - text_len = png_strlen(text); - - /* Compute the compressed data; do it now for the length */ - text_len = png_text_compress(png_ptr, text, text_len, compression-2, - &comp); - - - /* Make sure we include the compression flag, the compression byte, - * and the NULs after the key, lang, and lang_key parts */ - - png_write_chunk_start(png_ptr, (png_bytep)png_iTXt, - (png_uint_32)( - 5 /* comp byte, comp flag, terminators for key, lang and lang_key */ - + key_len - + lang_len - + lang_key_len - + text_len)); + new_key[++key_len] = PNG_COMPRESSION_TYPE_BASE; + ++key_len; /* for the keywod separator */ /* We leave it to the application to meet PNG-1.0 requirements on the * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of - * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them. + * any non-Latin-1 characters except for NEWLINE. ISO PNG, however, + * specifies that the text is UTF-8 and this really doesn't require any + * checking. + * * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. + * + * TODO: validate the language tag correctly (see the spec.) */ - png_write_chunk_data(png_ptr, (png_bytep)new_key, - (png_size_t)(key_len + 1)); + if (lang == NULL) lang = ""; /* empty language is valid */ + lang_len = strlen(lang)+1; + if (lang_key == NULL) lang_key = ""; /* may be empty */ + lang_key_len = strlen(lang_key)+1; + if (text == NULL) text = ""; /* may be empty */ - /* Set the compression flag */ - if (compression == PNG_ITXT_COMPRESSION_NONE || \ - compression == PNG_TEXT_COMPRESSION_NONE) - cbuf[0] = 0; - else /* compression == PNG_ITXT_COMPRESSION_zTXt */ - cbuf[0] = 1; - /* Set the compression method */ - cbuf[1] = 0; - png_write_chunk_data(png_ptr, cbuf, (png_size_t)2); + prefix_len = key_len; + if (lang_len > PNG_UINT_31_MAX-prefix_len) + prefix_len = PNG_UINT_31_MAX; + else + prefix_len = (png_uint_32)(prefix_len + lang_len); - cbuf[0] = 0; - png_write_chunk_data(png_ptr, (new_lang ? (png_bytep)new_lang : cbuf), - (png_size_t)(lang_len + 1)); - png_write_chunk_data(png_ptr, (lang_key ? (png_bytep)lang_key : cbuf), - (png_size_t)(lang_key_len + 1)); - png_write_compressed_data_out(png_ptr, &comp); + if (lang_key_len > PNG_UINT_31_MAX-prefix_len) + prefix_len = PNG_UINT_31_MAX; + else + prefix_len = (png_uint_32)(prefix_len + lang_key_len); + + png_text_compress_init(&comp, (png_const_bytep)text, strlen(text)); + + if (compression) + { + if (png_text_compress(png_ptr, png_iTXt, &comp, prefix_len) != Z_OK) + png_error(png_ptr, png_ptr->zstream.msg); + } + + else + { + if (comp.input_len > PNG_UINT_31_MAX-prefix_len) + png_error(png_ptr, "iTXt: uncompressed text too long"); + + /* So the string will fit in a chunk: */ + comp.output_len = (png_uint_32)/*SAFE*/comp.input_len; + } + + png_write_chunk_header(png_ptr, png_iTXt, comp.output_len + prefix_len); + + png_write_chunk_data(png_ptr, new_key, key_len); + + png_write_chunk_data(png_ptr, (png_const_bytep)lang, lang_len); + + png_write_chunk_data(png_ptr, (png_const_bytep)lang_key, lang_key_len); + + if (compression) + png_write_compressed_data_out(png_ptr, &comp); + + else + png_write_chunk_data(png_ptr, (png_const_bytep)text, comp.input_len); png_write_chunk_end(png_ptr); - png_free(png_ptr, new_key); - png_free(png_ptr, new_lang); } #endif #ifdef PNG_WRITE_oFFs_SUPPORTED /* Write the oFFs chunk */ void /* PRIVATE */ -png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset, - int unit_type) +png_write_oFFs(png_structrp png_ptr, png_int_32 x_offset, png_int_32 y_offset, + int unit_type) { - PNG_oFFs; png_byte buf[9]; png_debug(1, "in png_write_oFFs"); @@ -1543,63 +1784,67 @@ png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset, png_save_int_32(buf + 4, y_offset); buf[8] = (png_byte)unit_type; - png_write_chunk(png_ptr, (png_bytep)png_oFFs, buf, (png_size_t)9); + png_write_complete_chunk(png_ptr, png_oFFs, buf, (png_size_t)9); } #endif #ifdef PNG_WRITE_pCAL_SUPPORTED /* Write the pCAL chunk (described in the PNG extensions document) */ void /* PRIVATE */ -png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0, - png_int_32 X1, int type, int nparams, png_charp units, png_charpp params) +png_write_pCAL(png_structrp png_ptr, png_charp purpose, png_int_32 X0, + png_int_32 X1, int type, int nparams, png_const_charp units, + png_charpp params) { - PNG_pCAL; - png_size_t purpose_len, units_len, total_len; - png_uint_32p params_len; + png_uint_32 purpose_len; + png_size_t units_len, total_len; + png_size_tp params_len; png_byte buf[10]; - png_charp new_purpose; + png_byte new_purpose[80]; int i; png_debug1(1, "in png_write_pCAL (%d parameters)", nparams); if (type >= PNG_EQUATION_LAST) - png_warning(png_ptr, "Unrecognized equation type for pCAL chunk"); + png_error(png_ptr, "Unrecognized equation type for pCAL chunk"); + + purpose_len = png_check_keyword(png_ptr, purpose, new_purpose); + + if (purpose_len == 0) + png_error(png_ptr, "pCAL: invalid keyword"); + + ++purpose_len; /* terminator */ - purpose_len = png_check_keyword(png_ptr, purpose, &new_purpose) + 1; png_debug1(3, "pCAL purpose length = %d", (int)purpose_len); - units_len = png_strlen(units) + (nparams == 0 ? 0 : 1); + units_len = strlen(units) + (nparams == 0 ? 0 : 1); png_debug1(3, "pCAL units length = %d", (int)units_len); total_len = purpose_len + units_len + 10; - params_len = (png_uint_32p)png_malloc(png_ptr, - (png_alloc_size_t)(nparams * png_sizeof(png_uint_32))); + params_len = (png_size_tp)png_malloc(png_ptr, + (png_alloc_size_t)(nparams * (sizeof (png_size_t)))); /* Find the length of each parameter, making sure we don't count the - null terminator for the last parameter. */ + * null terminator for the last parameter. + */ for (i = 0; i < nparams; i++) { - params_len[i] = png_strlen(params[i]) + (i == nparams - 1 ? 0 : 1); + params_len[i] = strlen(params[i]) + (i == nparams - 1 ? 0 : 1); png_debug2(3, "pCAL parameter %d length = %lu", i, - (unsigned long) params_len[i]); - total_len += (png_size_t)params_len[i]; + (unsigned long)params_len[i]); + total_len += params_len[i]; } png_debug1(3, "pCAL total length = %d", (int)total_len); - png_write_chunk_start(png_ptr, (png_bytep)png_pCAL, (png_uint_32)total_len); - png_write_chunk_data(png_ptr, (png_bytep)new_purpose, - (png_size_t)purpose_len); + png_write_chunk_header(png_ptr, png_pCAL, (png_uint_32)total_len); + png_write_chunk_data(png_ptr, new_purpose, purpose_len); png_save_int_32(buf, X0); png_save_int_32(buf + 4, X1); buf[8] = (png_byte)type; buf[9] = (png_byte)nparams; png_write_chunk_data(png_ptr, buf, (png_size_t)10); - png_write_chunk_data(png_ptr, (png_bytep)units, (png_size_t)units_len); - - png_free(png_ptr, new_purpose); + png_write_chunk_data(png_ptr, (png_const_bytep)units, (png_size_t)units_len); for (i = 0; i < nparams; i++) { - png_write_chunk_data(png_ptr, (png_bytep)params[i], - (png_size_t)params_len[i]); + png_write_chunk_data(png_ptr, (png_const_bytep)params[i], params_len[i]); } png_free(png_ptr, params_len); @@ -1609,40 +1854,19 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0, #ifdef PNG_WRITE_sCAL_SUPPORTED /* Write the sCAL chunk */ -#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED) void /* PRIVATE */ -png_write_sCAL(png_structp png_ptr, int unit, double width, double height) +png_write_sCAL_s(png_structrp png_ptr, int unit, png_const_charp width, + png_const_charp height) { - PNG_sCAL; - char buf[64]; - png_size_t total_len; - - png_debug(1, "in png_write_sCAL"); - - buf[0] = (char)unit; - png_snprintf(buf + 1, 63, "%12.12e", width); - total_len = 1 + png_strlen(buf + 1) + 1; - png_snprintf(buf + total_len, 64-total_len, "%12.12e", height); - total_len += png_strlen(buf + total_len); - - png_debug1(3, "sCAL total length = %u", (unsigned int)total_len); - png_write_chunk(png_ptr, (png_bytep)png_sCAL, (png_bytep)buf, total_len); -} -#else -#ifdef PNG_FIXED_POINT_SUPPORTED -void /* PRIVATE */ -png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width, - png_charp height) -{ - PNG_sCAL; png_byte buf[64]; png_size_t wlen, hlen, total_len; png_debug(1, "in png_write_sCAL_s"); - wlen = png_strlen(width); - hlen = png_strlen(height); + wlen = strlen(width); + hlen = strlen(height); total_len = wlen + hlen + 2; + if (total_len > 64) { png_warning(png_ptr, "Can't write sCAL (buffer too small)"); @@ -1650,24 +1874,21 @@ png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width, } buf[0] = (png_byte)unit; - png_memcpy(buf + 1, width, wlen + 1); /* Append the '\0' here */ - png_memcpy(buf + wlen + 2, height, hlen); /* Do NOT append the '\0' here */ + memcpy(buf + 1, width, wlen + 1); /* Append the '\0' here */ + memcpy(buf + wlen + 2, height, hlen); /* Do NOT append the '\0' here */ png_debug1(3, "sCAL total length = %u", (unsigned int)total_len); - png_write_chunk(png_ptr, (png_bytep)png_sCAL, buf, total_len); + png_write_complete_chunk(png_ptr, png_sCAL, buf, total_len); } #endif -#endif -#endif #ifdef PNG_WRITE_pHYs_SUPPORTED /* Write the pHYs chunk */ void /* PRIVATE */ -png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit, - png_uint_32 y_pixels_per_unit, - int unit_type) +png_write_pHYs(png_structrp png_ptr, png_uint_32 x_pixels_per_unit, + png_uint_32 y_pixels_per_unit, + int unit_type) { - PNG_pHYs; png_byte buf[9]; png_debug(1, "in png_write_pHYs"); @@ -1679,7 +1900,7 @@ png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit, png_save_uint_32(buf + 4, y_pixels_per_unit); buf[8] = (png_byte)unit_type; - png_write_chunk(png_ptr, (png_bytep)png_pHYs, buf, (png_size_t)9); + png_write_complete_chunk(png_ptr, png_pHYs, buf, (png_size_t)9); } #endif @@ -1688,9 +1909,8 @@ png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit, * or png_convert_from_time_t(), or fill in the structure yourself. */ void /* PRIVATE */ -png_write_tIME(png_structp png_ptr, png_timep mod_time) +png_write_tIME(png_structrp png_ptr, png_const_timep mod_time) { - PNG_tIME; png_byte buf[7]; png_debug(1, "in png_write_tIME"); @@ -1710,48 +1930,53 @@ png_write_tIME(png_structp png_ptr, png_timep mod_time) buf[5] = mod_time->minute; buf[6] = mod_time->second; - png_write_chunk(png_ptr, (png_bytep)png_tIME, buf, (png_size_t)7); + png_write_complete_chunk(png_ptr, png_tIME, buf, (png_size_t)7); } #endif /* Initializes the row writing capability of libpng */ void /* PRIVATE */ -png_write_start_row(png_structp png_ptr) +png_write_start_row(png_structrp png_ptr) { #ifdef PNG_WRITE_INTERLACING_SUPPORTED /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* Start of interlace block */ - int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; /* Offset to next interlace block */ - int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; /* Start of interlace block in the y direction */ - int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; + static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; /* Offset to next interlace block in the y direction */ - int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; + static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; #endif - png_size_t buf_size; + png_alloc_size_t buf_size; + int usr_pixel_depth; png_debug(1, "in png_write_start_row"); - buf_size = (png_size_t)(PNG_ROWBYTES( - png_ptr->usr_channels*png_ptr->usr_bit_depth, png_ptr->width) + 1); + usr_pixel_depth = png_ptr->usr_channels * png_ptr->usr_bit_depth; + buf_size = PNG_ROWBYTES(usr_pixel_depth, png_ptr->width) + 1; + + /* 1.5.6: added to allow checking in the row write code. */ + png_ptr->transformed_pixel_depth = png_ptr->pixel_depth; + png_ptr->maximum_pixel_depth = (png_byte)usr_pixel_depth; /* Set up row buffer */ - png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, - (png_alloc_size_t)buf_size); + png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, buf_size); + png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE; #ifdef PNG_WRITE_FILTER_SUPPORTED /* Set up filtering buffer, if using this filter */ if (png_ptr->do_filter & PNG_FILTER_SUB) { - png_ptr->sub_row = (png_bytep)png_malloc(png_ptr, - (png_alloc_size_t)(png_ptr->rowbytes + 1)); + png_ptr->sub_row = (png_bytep)png_malloc(png_ptr, png_ptr->rowbytes + 1); + png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB; } @@ -1759,27 +1984,29 @@ png_write_start_row(png_structp png_ptr) if (png_ptr->do_filter & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH)) { /* Set up previous row buffer */ - png_ptr->prev_row = (png_bytep)png_calloc(png_ptr, - (png_alloc_size_t)buf_size); + png_ptr->prev_row = (png_bytep)png_calloc(png_ptr, buf_size); if (png_ptr->do_filter & PNG_FILTER_UP) { png_ptr->up_row = (png_bytep)png_malloc(png_ptr, - (png_size_t)(png_ptr->rowbytes + 1)); + png_ptr->rowbytes + 1); + png_ptr->up_row[0] = PNG_FILTER_VALUE_UP; } if (png_ptr->do_filter & PNG_FILTER_AVG) { png_ptr->avg_row = (png_bytep)png_malloc(png_ptr, - (png_alloc_size_t)(png_ptr->rowbytes + 1)); + png_ptr->rowbytes + 1); + png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG; } if (png_ptr->do_filter & PNG_FILTER_PAETH) { png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr, - (png_size_t)(png_ptr->rowbytes + 1)); + png_ptr->rowbytes + 1); + png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH; } } @@ -1792,48 +2019,47 @@ png_write_start_row(png_structp png_ptr) if (!(png_ptr->transformations & PNG_INTERLACE)) { png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 - - png_pass_ystart[0]) / png_pass_yinc[0]; + png_pass_ystart[0]) / png_pass_yinc[0]; + png_ptr->usr_width = (png_ptr->width + png_pass_inc[0] - 1 - - png_pass_start[0]) / png_pass_inc[0]; + png_pass_start[0]) / png_pass_inc[0]; } + else { png_ptr->num_rows = png_ptr->height; png_ptr->usr_width = png_ptr->width; } } + else #endif { png_ptr->num_rows = png_ptr->height; png_ptr->usr_width = png_ptr->width; } - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - png_ptr->zstream.next_out = png_ptr->zbuf; } /* Internal use only. Called when finished processing a row of data. */ void /* PRIVATE */ -png_write_finish_row(png_structp png_ptr) +png_write_finish_row(png_structrp png_ptr) { #ifdef PNG_WRITE_INTERLACING_SUPPORTED /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* Start of interlace block */ - int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; /* Offset to next interlace block */ - int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; /* Start of interlace block in the y direction */ - int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; + static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; /* Offset to next interlace block in the y direction */ - int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; + static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; #endif - int ret; - png_debug(1, "in png_write_finish_row"); /* Next row */ @@ -1852,24 +2078,30 @@ png_write_finish_row(png_structp png_ptr) { png_ptr->pass++; } + else { /* Loop until we find a non-zero width or height pass */ do { png_ptr->pass++; + if (png_ptr->pass >= 7) break; + png_ptr->usr_width = (png_ptr->width + - png_pass_inc[png_ptr->pass] - 1 - - png_pass_start[png_ptr->pass]) / - png_pass_inc[png_ptr->pass]; + png_pass_inc[png_ptr->pass] - 1 - + png_pass_start[png_ptr->pass]) / + png_pass_inc[png_ptr->pass]; + png_ptr->num_rows = (png_ptr->height + - png_pass_yinc[png_ptr->pass] - 1 - - png_pass_ystart[png_ptr->pass]) / - png_pass_yinc[png_ptr->pass]; + png_pass_yinc[png_ptr->pass] - 1 - + png_pass_ystart[png_ptr->pass]) / + png_pass_yinc[png_ptr->pass]; + if (png_ptr->transformations & PNG_INTERLACE) break; + } while (png_ptr->usr_width == 0 || png_ptr->num_rows == 0); } @@ -1878,9 +2110,10 @@ png_write_finish_row(png_structp png_ptr) if (png_ptr->pass < 7) { if (png_ptr->prev_row != NULL) - png_memset(png_ptr->prev_row, 0, - (png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels* - png_ptr->usr_bit_depth, png_ptr->width)) + 1); + memset(png_ptr->prev_row, 0, + (png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels* + png_ptr->usr_bit_depth, png_ptr->width)) + 1); + return; } } @@ -1888,39 +2121,7 @@ png_write_finish_row(png_structp png_ptr) /* If we get here, we've just written the last row, so we need to flush the compressor */ - do - { - /* Tell the compressor we are done */ - ret = deflate(&png_ptr->zstream, Z_FINISH); - /* Check for an error */ - if (ret == Z_OK) - { - /* Check to see if we need more room */ - if (!(png_ptr->zstream.avail_out)) - { - png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - } - } - else if (ret != Z_STREAM_END) - { - if (png_ptr->zstream.msg != NULL) - png_error(png_ptr, png_ptr->zstream.msg); - else - png_error(png_ptr, "zlib error"); - } - } while (ret != Z_STREAM_END); - - /* Write any extra space */ - if (png_ptr->zstream.avail_out < png_ptr->zbuf_size) - { - png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size - - png_ptr->zstream.avail_out); - } - - deflateReset(&png_ptr->zstream); - png_ptr->zstream.data_type = Z_BINARY; + png_compress_IDAT(png_ptr, NULL, 0, Z_FINISH); } #ifdef PNG_WRITE_INTERLACING_SUPPORTED @@ -1937,10 +2138,10 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* Start of interlace block */ - int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; /* Offset to next interlace block */ - int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; png_debug(1, "in png_do_write_interlace"); @@ -1963,6 +2164,7 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) dp = row; d = 0; shift = 7; + for (i = png_pass_start[pass]; i < row_width; i += png_pass_inc[pass]) { @@ -1976,14 +2178,17 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) *dp++ = (png_byte)d; d = 0; } + else shift--; } if (shift != 7) *dp = (png_byte)d; + break; } + case 2: { png_bytep sp; @@ -1997,6 +2202,7 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) dp = row; shift = 6; d = 0; + for (i = png_pass_start[pass]; i < row_width; i += png_pass_inc[pass]) { @@ -2010,13 +2216,16 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) *dp++ = (png_byte)d; d = 0; } + else shift -= 2; } if (shift != 6) - *dp = (png_byte)d; + *dp = (png_byte)d; + break; } + case 4: { png_bytep sp; @@ -2031,7 +2240,7 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) shift = 4; d = 0; for (i = png_pass_start[pass]; i < row_width; - i += png_pass_inc[pass]) + i += png_pass_inc[pass]) { sp = row + (png_size_t)(i >> 1); value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f; @@ -2043,13 +2252,16 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) *dp++ = (png_byte)d; d = 0; } + else shift -= 4; } if (shift != 4) *dp = (png_byte)d; + break; } + default: { png_bytep sp; @@ -2060,18 +2272,21 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) /* Start at the beginning */ dp = row; + /* Find out how many bytes each pixel takes up */ pixel_bytes = (row_info->pixel_depth >> 3); - /* Loop through the row, only looking at the pixels that - matter */ + + /* Loop through the row, only looking at the pixels that matter */ for (i = png_pass_start[pass]; i < row_width; i += png_pass_inc[pass]) { /* Find out where the original pixel is */ sp = row + (png_size_t)i * pixel_bytes; + /* Move the pixel */ if (dp != sp) - png_memcpy(dp, sp, pixel_bytes); + memcpy(dp, sp, pixel_bytes); + /* Next pixel */ dp += pixel_bytes; } @@ -2080,11 +2295,12 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) } /* Set new row width */ row_info->width = (row_info->width + - png_pass_inc[pass] - 1 - - png_pass_start[pass]) / - png_pass_inc[pass]; - row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, - row_info->width); + png_pass_inc[pass] - 1 - + png_pass_start[pass]) / + png_pass_inc[pass]; + + row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, + row_info->width); } } #endif @@ -2093,21 +2309,24 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) * been specified by the application, and then writes the row out with the * chosen filter. */ +static void png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row, + png_size_t row_bytes); + #define PNG_MAXSUM (((png_uint_32)(-1)) >> 1) #define PNG_HISHIFT 10 #define PNG_LOMASK ((png_uint_32)0xffffL) #define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT)) void /* PRIVATE */ -png_write_find_filter(png_structp png_ptr, png_row_infop row_info) +png_write_find_filter(png_structrp png_ptr, png_row_infop row_info) { png_bytep best_row; #ifdef PNG_WRITE_FILTER_SUPPORTED png_bytep prev_row, row_buf; png_uint_32 mins, bpp; png_byte filter_to_do = png_ptr->do_filter; - png_uint_32 row_bytes = row_info->rowbytes; + png_size_t row_bytes = row_info->rowbytes; #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED - int num_p_filters = (int)png_ptr->num_prev_filters; + int num_p_filters = png_ptr->num_prev_filters; #endif png_debug(1, "in png_write_find_filter"); @@ -2115,8 +2334,8 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) #ifndef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED if (png_ptr->row_number == 0 && filter_to_do == PNG_ALL_FILTERS) { - /* These will never be selected so we need not test them. */ - filter_to_do &= ~(PNG_FILTER_UP | PNG_FILTER_PAETH); + /* These will never be selected so we need not test them. */ + filter_to_do &= ~(PNG_FILTER_UP | PNG_FILTER_PAETH); } #endif @@ -2142,11 +2361,14 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) * computationally expensive). * * GRR 980525: consider also + * * (1) minimum sum of absolute differences from running average (i.e., * keep running sum of non-absolute differences & count of bytes) * [track dispersion, too? restart average if dispersion too large?] + * * (1b) minimum sum of absolute differences from sliding average, probably * with window size <= deflate window (usually 32K) + * * (2) minimum sum of squared differences from zero or running average * (i.e., ~ root-mean-square approach) */ @@ -2155,12 +2377,11 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) /* We don't need to test the 'no filter' case if this is the only filter * that has been chosen, as it doesn't actually do anything to the data. */ - if ((filter_to_do & PNG_FILTER_NONE) && - filter_to_do != PNG_FILTER_NONE) + if ((filter_to_do & PNG_FILTER_NONE) && filter_to_do != PNG_FILTER_NONE) { png_bytep rp; png_uint_32 sum = 0; - png_uint_32 i; + png_size_t i; int v; for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++) @@ -2183,9 +2404,10 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE) { sumlo = (sumlo * png_ptr->filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; + sumhi = (sumhi * png_ptr->filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; } } @@ -2194,12 +2416,14 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) * it has the minimum possible computational cost - none). */ sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; + sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; if (sumhi > PNG_HIMASK) sum = PNG_MAXSUM; + else sum = (sumhi << PNG_HISHIFT) + sumlo; } @@ -2212,17 +2436,20 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) /* It's the only filter so no testing is needed */ { png_bytep rp, lp, dp; - png_uint_32 i; + png_size_t i; + for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp; i++, rp++, dp++) { *dp = *rp; } + for (lp = row_buf + 1; i < row_bytes; i++, rp++, lp++, dp++) { *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff); } + best_row = png_ptr->sub_row; } @@ -2230,7 +2457,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) { png_bytep rp, dp, lp; png_uint_32 sum = 0, lmins = mins; - png_uint_32 i; + png_size_t i; int v; #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED @@ -2250,19 +2477,22 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB) { lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; + lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; } } lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; + lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; if (lmhi > PNG_HIMASK) lmins = PNG_MAXSUM; + else lmins = (lmhi << PNG_HISHIFT) + lmlo; } @@ -2275,6 +2505,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) sum += (v < 128) ? v : 256 - v; } + for (lp = row_buf + 1; i < row_bytes; i++, rp++, lp++, dp++) { @@ -2299,19 +2530,22 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB) { sumlo = (sumlo * png_ptr->inv_filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; + sumhi = (sumhi * png_ptr->inv_filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; } } sumlo = (sumlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; + sumhi = (sumhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; if (sumhi > PNG_HIMASK) sum = PNG_MAXSUM; + else sum = (sumhi << PNG_HISHIFT) + sumlo; } @@ -2328,14 +2562,15 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) if (filter_to_do == PNG_FILTER_UP) { png_bytep rp, dp, pp; - png_uint_32 i; + png_size_t i; for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1, - pp = prev_row + 1; i < row_bytes; - i++, rp++, pp++, dp++) + pp = prev_row + 1; i < row_bytes; + i++, rp++, pp++, dp++) { *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff); } + best_row = png_ptr->up_row; } @@ -2343,7 +2578,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) { png_bytep rp, dp, pp; png_uint_32 sum = 0, lmins = mins; - png_uint_32 i; + png_size_t i; int v; @@ -2360,26 +2595,29 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP) { lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; + lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; } } lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; + lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; if (lmhi > PNG_HIMASK) lmins = PNG_MAXSUM; + else lmins = (lmhi << PNG_HISHIFT) + lmlo; } #endif for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1, - pp = prev_row + 1; i < row_bytes; i++) + pp = prev_row + 1; i < row_bytes; i++) { v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); @@ -2402,19 +2640,22 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP) { sumlo = (sumlo * png_ptr->filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; + sumhi = (sumhi * png_ptr->filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; } } sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; + sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; if (sumhi > PNG_HIMASK) sum = PNG_MAXSUM; + else sum = (sumhi << PNG_HISHIFT) + sumlo; } @@ -2432,11 +2673,13 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) { png_bytep rp, dp, pp, lp; png_uint_32 i; + for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1, pp = prev_row + 1; i < bpp; i++) { *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff); } + for (lp = row_buf + 1; i < row_bytes; i++) { *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) @@ -2449,7 +2692,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) { png_bytep rp, dp, pp, lp; png_uint_32 sum = 0, lmins = mins; - png_uint_32 i; + png_size_t i; int v; #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED @@ -2465,19 +2708,22 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_AVG) { lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; + lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; } } lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; + lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; if (lmhi > PNG_HIMASK) lmins = PNG_MAXSUM; + else lmins = (lmhi << PNG_HISHIFT) + lmlo; } @@ -2490,10 +2736,11 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) sum += (v < 128) ? v : 256 - v; } + for (lp = row_buf + 1; i < row_bytes; i++) { v = *dp++ = - (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) & 0xff); + (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) & 0xff); sum += (v < 128) ? v : 256 - v; @@ -2514,19 +2761,22 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE) { sumlo = (sumlo * png_ptr->filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; + sumhi = (sumhi * png_ptr->filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; } } sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; + sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; if (sumhi > PNG_HIMASK) sum = PNG_MAXSUM; + else sum = (sumhi << PNG_HISHIFT) + sumlo; } @@ -2543,9 +2793,10 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) if (filter_to_do == PNG_FILTER_PAETH) { png_bytep rp, dp, pp, cp, lp; - png_uint_32 i; + png_size_t i; + for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1, - pp = prev_row + 1; i < bpp; i++) + pp = prev_row + 1; i < bpp; i++) { *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); } @@ -2582,7 +2833,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) { png_bytep rp, dp, pp, cp, lp; png_uint_32 sum = 0, lmins = mins; - png_uint_32 i; + png_size_t i; int v; #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED @@ -2598,26 +2849,29 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH) { lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; + lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; } } lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; + lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; if (lmhi > PNG_HIMASK) lmins = PNG_MAXSUM; + else lmins = (lmhi << PNG_HISHIFT) + lmlo; } #endif for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1, - pp = prev_row + 1; i < bpp; i++) + pp = prev_row + 1; i < bpp; i++) { v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); @@ -2650,10 +2904,13 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) pa = abs(p - a); pb = abs(p - b); pc = abs(p - c); + if (pa <= pb && pa <= pc) p = a; + else if (pb <= pc) p = b; + else p = c; #endif /* PNG_SLOW_PAETH */ @@ -2679,19 +2936,22 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH) { sumlo = (sumlo * png_ptr->filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; + sumhi = (sumhi * png_ptr->filter_weights[j]) >> - PNG_WEIGHT_SHIFT; + PNG_WEIGHT_SHIFT; } } sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; + sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >> - PNG_COST_SHIFT; + PNG_COST_SHIFT; if (sumhi > PNG_HIMASK) sum = PNG_MAXSUM; + else sum = (sumhi << PNG_HISHIFT) + sumlo; } @@ -2703,9 +2963,9 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) } } #endif /* PNG_WRITE_FILTER_SUPPORTED */ - /* Do the actual writing of the filtered row data from the chosen filter. */ - png_write_filtered_row(png_ptr, best_row); + /* Do the actual writing of the filtered row data from the chosen filter. */ + png_write_filtered_row(png_ptr, best_row, row_info->rowbytes+1); #ifdef PNG_WRITE_FILTER_SUPPORTED #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED @@ -2713,10 +2973,12 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) if (png_ptr->num_prev_filters > 0) { int j; + for (j = 1; j < num_p_filters; j++) { png_ptr->prev_filters[j] = png_ptr->prev_filters[j - 1]; } + png_ptr->prev_filters[j] = best_row[0]; } #endif @@ -2725,42 +2987,15 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info) /* Do the actual writing of a previously filtered row. */ -void /* PRIVATE */ -png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row) +static void +png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row, + png_size_t full_row_length/*includes filter byte*/) { png_debug(1, "in png_write_filtered_row"); png_debug1(2, "filter = %d", filtered_row[0]); - /* Set up the zlib input buffer */ - png_ptr->zstream.next_in = filtered_row; - png_ptr->zstream.avail_in = (uInt)png_ptr->row_info.rowbytes + 1; - /* Repeat until we have compressed all the data */ - do - { - int ret; /* Return of zlib */ - - /* Compress the data */ - ret = deflate(&png_ptr->zstream, Z_NO_FLUSH); - /* Check for compression errors */ - if (ret != Z_OK) - { - if (png_ptr->zstream.msg != NULL) - png_error(png_ptr, png_ptr->zstream.msg); - else - png_error(png_ptr, "zlib error"); - } - - /* See if it is time to write another IDAT */ - if (!(png_ptr->zstream.avail_out)) - { - /* Write the IDAT and reset the zlib output buffer */ - png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - } - /* Repeat until all data has been compressed */ - } while (png_ptr->zstream.avail_in); + png_compress_IDAT(png_ptr, filtered_row, full_row_length, Z_NO_FLUSH); /* Swap the current and previous rows */ if (png_ptr->prev_row != NULL) diff --git a/project/jni/sdl2_image/Android.mk b/project/jni/sdl2_image/Android.mk new file mode 100644 index 000000000..50c341bd9 --- /dev/null +++ b/project/jni/sdl2_image/Android.mk @@ -0,0 +1,24 @@ +LOCAL_PATH := $(call my-dir) + +include $(CLEAR_VARS) + +LOCAL_MODULE := sdl2_image + +LOCAL_C_INCLUDES := $(LOCAL_PATH) $(LOCAL_PATH)/../jpeg/include $(LOCAL_PATH)/../png/include $(LOCAL_PATH)/../sdl-$(SDL_VERSION)/include $(LOCAL_PATH)/include +LOCAL_CFLAGS := -O3 \ + -DLOAD_JPG -DLOAD_PNG -DLOAD_BMP -DLOAD_GIF -DLOAD_LBM \ + -DLOAD_PCX -DLOAD_PNM -DLOAD_TGA -DLOAD_XCF -DLOAD_XPM \ + -DLOAD_XV + +LOCAL_CPP_EXTENSION := .cpp + +LOCAL_SRC_FILES := $(notdir $(wildcard $(LOCAL_PATH)/*.c)) + +LOCAL_STATIC_LIBRARIES := png jpeg + +LOCAL_SHARED_LIBRARIES := sdl-$(SDL_VERSION) + +LOCAL_LDLIBS := -lz + +include $(BUILD_SHARED_LIBRARY) + diff --git a/project/jni/sdl2_image/CHANGES.txt b/project/jni/sdl2_image/CHANGES.txt new file mode 100644 index 000000000..cc174e268 --- /dev/null +++ b/project/jni/sdl2_image/CHANGES.txt @@ -0,0 +1,114 @@ +2.0.0: +Sam Lantinga - Sun Jun 2 22:25:31 PDT 2013 + * Added PNG save support based on miniz.c by Rich Geldreich + IMG_SavePNG(), IMG_SavePNG_RW() +Sam Lantinga - Sat Jun 1 19:11:26 PDT 2013 + * Updated for SDL 2.0 release +Sam Lantinga - Sat Mar 23 13:36:51 PDT 2013 + * Fixed bug setting colorkey for indexed PNG images +Torsten Stremlau - Sun Mar 10 10:19:25 PDT 2013 + * Added support for alpha and lossless WEBP images + +1.2.12: +mscott - 2012-02-06 19:40:23 PST + * Fixed image corruption when using ImageIO framework +Sylvain - Thu Nov 22 13:09:59 PST 2012 + * Added extended XPM color table (disabled by default in IMG_xpm.c) +Sam Lantinga - Thu Jan 19 23:18:09 EST 2012 + * Fixed regression in 1.2.11 loading 8-bit PNG images with libpng + +1.2.11: +Sam Lantinga - Sat Jan 14 17:54:38 EST 2012 + * Fixed loading 8-bit PNG images on Mac OS X +Sam Lantinga - Sat Dec 31 09:35:40 EST 2011 + * SDL_image is now under the zlib license +Michael Bonfils - Mon Nov 28 21:46:00 EST 2011 + * Added WEBP image support +Thomas Klausner - Wed Jan 19 19:31:25 PST 2011 + * Fixed compiling with libpng 1.4 +Sam Lantinga - Mon Jan 10 12:09:57 2011 -0800 + * Added Android.mk to build on the Android platform +Sam Lantinga - Mon May 10 22:42:53 PDT 2010 + * Fixed loading HAM6 images with stencil mask +Mark Tucker - Fri, 27 Nov 2009 12:38:21 -0500 + * Fixed bug loading 15 and 16 bit BMP images + +1.2.10: +Sam Lantinga - Sat Nov 14 11:22:14 PST 2009 + * Fixed bug loading multiple images + +1.2.9: +Sam Lantinga - Tue Nov 10 00:29:20 PST 2009 + * Fixed alpha premultiplication on Mac OS X and iPhone OS +Sam Lantinga - Sun Nov 8 07:52:11 PST 2009 + * Fixed checking for IMG_Init() return value in image loaders + +1.2.8: +Sam Lantinga - Sun Oct 4 13:12:54 PDT 2009 + * Added support for uncompressed PCX files +Mason Wheeler - 2009-06-10 06:29:45 PDT + * Added IMG_Init()/IMG_Quit() to prevent constantly loading and unloading DLLs +Couriersud - Mon, 12 Jan 2009 17:21:13 -0800 + * Added support for ICO and CUR image files +Eric Wing - Fri, 2 Jan 2009 02:01:16 -0800 + * Added ImageIO loading infrastructure for Mac OS X + * Added UIImage loading infrastructure for iPhone / iPod Touch + +1.2.7: +Sam Lantinga - Sun Nov 2 15:08:27 PST 2008 + * Fixed buffer overflow in BMP loading code, discovered by j00ru//vx +Sam Lantinga - Fri Dec 28 08:34:54 PST 2007 + * Fixed buffer overflow in GIF loading code, discovered by Michael Skladnikiewicz + +1.2.6: +Sam lantinga - Wed Jul 18 00:30:32 PDT 2007 + * Improved detection of libjpeg, libpng, and libtiff at configure time + * PNG and TIFF images are correctly identified even if dynamic libraries + to load them aren't available. + * Fixed loading of TIFF images using libtiff 3.6 +Sam Lantinga - Thu Jul 5 07:52:35 2007 + * Fixed static linking with libjpeg +Michael Koch - Tue Feb 13 10:09:17 2007 + * Fixed crash in IMG_ReadXPMFromArray() + +1.2.5: +Maurizio Monge - Sun May 14 13:57:32 PDT 2006 + * Fixed loading BMP palettes at unusual offsets +Sam Lantinga - Thu May 11 21:51:19 PDT 2006 + * Added support for dynamically loading libjpeg, libpng, and libtiff. +Sam Lantinga - Sun Apr 30 01:48:40 PDT 2006 + * Added gcc-fat.sh for generating Universal binaries on Mac OS X + * Updated libtool support to version 1.5.22 +Sam Lantinga - Sat Feb 4 15:17:44 PST 2006 + * Added support for XV thumbnail images +Gautier Portet - Fri, 19 Mar 2004 17:35:12 +0100 + * Added support for 32-bit BMP files with alpha + +1.2.4: +Pierre G. Richard - Fri, 30 Jul 2004 11:13:11 +0000 (UTC) + * Added support for RLE encoded BMP files +Marc Le Douarain - Fri, 26 Dec 2003 18:23:42 +0100 + * Added EHB and HAM mode support to the ILBM loader +Sam Lantinga - Wed Nov 19 00:23:44 PST 2003 + * Updated libtool support for new mingw32 DLL build process +Holger Schemel - Mon, 04 Aug 2003 21:50:52 +0200 + * Fixed crash loading certain PCX images +Kyle Davenport - Sat, 19 Apr 2003 17:13:31 -0500 + * Added .la files to the development RPM, fixing RPM build on RedHat 8 + +1.2.3: +Ryan C. Gordon - Sat, 8 Feb 2003 09:36:33 -0500 + * Fixed memory leak with non-seekable SDL_RWops +Marc Le Douarain - Sun, 22 Dec 2002 22:59:51 +0100 + * Added 24-bit support to the ILBM format loader +Sam Lantinga - Sun Oct 20 20:55:46 PDT 2002 + * Added shared library support for MacOS X +Pete Shinners - Thu Jun 20 10:05:54 PDT 2002 + * The JPEG loader can now load EXIF format JPEG images +Dag-Erling Smorgrav - Thu May 2 19:09:48 PDT 2002 + * The XCF loader now ignores invisible layers and channels + +1.2.2: +Sam Lantinga - Sat Apr 13 07:49:47 PDT 2002 + * Updated autogen.sh for new versions of automake + * Specify the SDL API calling convention (C by default) diff --git a/project/jni/sdl2_image/COPYING.txt b/project/jni/sdl2_image/COPYING.txt new file mode 100644 index 000000000..eed295df1 --- /dev/null +++ b/project/jni/sdl2_image/COPYING.txt @@ -0,0 +1,20 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ diff --git a/project/jni/sdl2_image/IMG.c b/project/jni/sdl2_image/IMG.c new file mode 100644 index 000000000..e4aecf89b --- /dev/null +++ b/project/jni/sdl2_image/IMG.c @@ -0,0 +1,239 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/* A simple library to load images of various formats as SDL surfaces */ + +#include +#include +#include + +#include "SDL_image.h" + +#define ARRAYSIZE(a) (sizeof(a) / sizeof((a)[0])) + +/* Table of image detection and loading functions */ +static struct { + char *type; + int (SDLCALL *is)(SDL_RWops *src); + SDL_Surface *(SDLCALL *load)(SDL_RWops *src); +} supported[] = { + /* keep magicless formats first */ + { "TGA", NULL, IMG_LoadTGA_RW }, + { "CUR", IMG_isCUR, IMG_LoadCUR_RW }, + { "ICO", IMG_isICO, IMG_LoadICO_RW }, + { "BMP", IMG_isBMP, IMG_LoadBMP_RW }, + { "GIF", IMG_isGIF, IMG_LoadGIF_RW }, + { "JPG", IMG_isJPG, IMG_LoadJPG_RW }, + { "LBM", IMG_isLBM, IMG_LoadLBM_RW }, + { "PCX", IMG_isPCX, IMG_LoadPCX_RW }, + { "PNG", IMG_isPNG, IMG_LoadPNG_RW }, + { "PNM", IMG_isPNM, IMG_LoadPNM_RW }, /* P[BGP]M share code */ + { "TIF", IMG_isTIF, IMG_LoadTIF_RW }, + { "XCF", IMG_isXCF, IMG_LoadXCF_RW }, + { "XPM", IMG_isXPM, IMG_LoadXPM_RW }, + { "XV", IMG_isXV, IMG_LoadXV_RW }, + { "WEBP", IMG_isWEBP, IMG_LoadWEBP_RW }, +}; + +const SDL_version *IMG_Linked_Version(void) +{ + static SDL_version linked_version; + SDL_IMAGE_VERSION(&linked_version); + return(&linked_version); +} + +extern int IMG_InitJPG(); +extern void IMG_QuitJPG(); +extern int IMG_InitPNG(); +extern void IMG_QuitPNG(); +extern int IMG_InitTIF(); +extern void IMG_QuitTIF(); + +extern int IMG_InitWEBP(); +extern void IMG_QuitWEBP(); + +static int initialized = 0; + +int IMG_Init(int flags) +{ + int result = 0; + + if (flags & IMG_INIT_JPG) { + if ((initialized & IMG_INIT_JPG) || IMG_InitJPG() == 0) { + result |= IMG_INIT_JPG; + } + } + if (flags & IMG_INIT_PNG) { + if ((initialized & IMG_INIT_PNG) || IMG_InitPNG() == 0) { + result |= IMG_INIT_PNG; + } + } + if (flags & IMG_INIT_TIF) { + if ((initialized & IMG_INIT_TIF) || IMG_InitTIF() == 0) { + result |= IMG_INIT_TIF; + } + } + if (flags & IMG_INIT_WEBP) { + if ((initialized & IMG_INIT_WEBP) || IMG_InitWEBP() == 0) { + result |= IMG_INIT_WEBP; + } + } + initialized |= result; + + return (initialized); +} + +void IMG_Quit() +{ + if (initialized & IMG_INIT_JPG) { + IMG_QuitJPG(); + } + if (initialized & IMG_INIT_PNG) { + IMG_QuitPNG(); + } + if (initialized & IMG_INIT_TIF) { + IMG_QuitTIF(); + } + if (initialized & IMG_INIT_WEBP) { + IMG_QuitWEBP(); + } + initialized = 0; +} + +#if !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) +/* Load an image from a file */ +SDL_Surface *IMG_Load(const char *file) +{ + SDL_RWops *src = SDL_RWFromFile(file, "rb"); + const char *ext = strrchr(file, '.'); + if(ext) { + ext++; + } + if(!src) { + /* The error message has been set in SDL_RWFromFile */ + return NULL; + } + return IMG_LoadTyped_RW(src, 1, ext); +} +#endif + +/* Load an image from an SDL datasource (for compatibility) */ +SDL_Surface *IMG_Load_RW(SDL_RWops *src, int freesrc) +{ + return IMG_LoadTyped_RW(src, freesrc, NULL); +} + +/* Portable case-insensitive string compare function */ +static int IMG_string_equals(const char *str1, const char *str2) +{ + while ( *str1 && *str2 ) { + if ( toupper((unsigned char)*str1) != + toupper((unsigned char)*str2) ) + break; + ++str1; + ++str2; + } + return (!*str1 && !*str2); +} + +/* Load an image from an SDL datasource, optionally specifying the type */ +SDL_Surface *IMG_LoadTyped_RW(SDL_RWops *src, int freesrc, const char *type) +{ + int i; + SDL_Surface *image; + + /* Make sure there is something to do.. */ + if ( src == NULL ) { + IMG_SetError("Passed a NULL data source"); + return(NULL); + } + + /* See whether or not this data source can handle seeking */ + if ( SDL_RWseek(src, 0, RW_SEEK_CUR) < 0 ) { + IMG_SetError("Can't seek in this data source"); + if(freesrc) + SDL_RWclose(src); + return(NULL); + } + + /* Detect the type of image being loaded */ + image = NULL; + for ( i=0; i < ARRAYSIZE(supported); ++i ) { + if(supported[i].is) { + if(!supported[i].is(src)) + continue; + } else { + /* magicless format */ + if(!type + || !IMG_string_equals(type, supported[i].type)) + continue; + } +#ifdef DEBUG_IMGLIB + fprintf(stderr, "IMGLIB: Loading image as %s\n", + supported[i].type); +#endif + image = supported[i].load(src); + if(freesrc) + SDL_RWclose(src); + return image; + } + + if ( freesrc ) { + SDL_RWclose(src); + } + IMG_SetError("Unsupported image format"); + return NULL; +} + +#if SDL_VERSION_ATLEAST(2,0,0) +SDL_Texture *IMG_LoadTexture(SDL_Renderer *renderer, const char *file) +{ + SDL_Texture *texture = NULL; + SDL_Surface *surface = IMG_Load(file); + if (surface) { + texture = SDL_CreateTextureFromSurface(renderer, surface); + SDL_FreeSurface(surface); + } + return texture; +} + +SDL_Texture *IMG_LoadTexture_RW(SDL_Renderer *renderer, SDL_RWops *src, int freesrc) +{ + SDL_Texture *texture = NULL; + SDL_Surface *surface = IMG_Load_RW(src, freesrc); + if (surface) { + texture = SDL_CreateTextureFromSurface(renderer, surface); + SDL_FreeSurface(surface); + } + return texture; +} + +SDL_Texture *IMG_LoadTextureTyped_RW(SDL_Renderer *renderer, SDL_RWops *src, int freesrc, const char *type) +{ + SDL_Texture *texture = NULL; + SDL_Surface *surface = IMG_LoadTyped_RW(src, freesrc, type); + if (surface) { + texture = SDL_CreateTextureFromSurface(renderer, surface); + SDL_FreeSurface(surface); + } + return texture; +} +#endif /* SDL 2.0 */ diff --git a/project/jni/sdl2_image/IMG_bmp.c b/project/jni/sdl2_image/IMG_bmp.c new file mode 100644 index 000000000..59903029e --- /dev/null +++ b/project/jni/sdl2_image/IMG_bmp.c @@ -0,0 +1,892 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +#if (!defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND)) || !defined(BMP_USES_IMAGEIO) + +/* This is a BMP image file loading framework + * + * ICO/CUR file support is here as well since it uses similar internal + * representation + * + * A good test suite of BMP images is available at: + * http://entropymine.com/jason/bmpsuite/bmpsuite/html/bmpsuite.html + */ + +#include +#include + +#include "SDL_image.h" + +#ifdef LOAD_BMP + +/* See if an image is contained in a data source */ +int IMG_isBMP(SDL_RWops *src) +{ + Sint64 start; + int is_BMP; + char magic[2]; + + if ( !src ) + return 0; + start = SDL_RWtell(src); + is_BMP = 0; + if ( SDL_RWread(src, magic, sizeof(magic), 1) ) { + if ( SDL_strncmp(magic, "BM", 2) == 0 ) { + is_BMP = 1; + } + } + SDL_RWseek(src, start, RW_SEEK_SET); + return(is_BMP); +} + +static int IMG_isICOCUR(SDL_RWops *src, int type) +{ + Sint64 start; + int is_ICOCUR; + + /* The Win32 ICO file header (14 bytes) */ + Uint16 bfReserved; + Uint16 bfType; + Uint16 bfCount; + + if ( !src ) + return 0; + start = SDL_RWtell(src); + is_ICOCUR = 0; + bfReserved = SDL_ReadLE16(src); + bfType = SDL_ReadLE16(src); + bfCount = SDL_ReadLE16(src); + if ((bfReserved == 0) && (bfType == type) && (bfCount != 0)) + is_ICOCUR = 1; + SDL_RWseek(src, start, RW_SEEK_SET); + + return (is_ICOCUR); +} + +int IMG_isICO(SDL_RWops *src) +{ + return IMG_isICOCUR(src, 1); +} + +int IMG_isCUR(SDL_RWops *src) +{ + return IMG_isICOCUR(src, 2); +} + +#include "SDL_error.h" +#include "SDL_video.h" +#include "SDL_endian.h" + +/* Compression encodings for BMP files */ +#ifndef BI_RGB +#define BI_RGB 0 +#define BI_RLE8 1 +#define BI_RLE4 2 +#define BI_BITFIELDS 3 +#endif + +static int readRlePixels(SDL_Surface * surface, SDL_RWops * src, int isRle8) +{ + /* + | Sets the surface pixels from src. A bmp image is upside down. + */ + int pitch = surface->pitch; + int height = surface->h; + Uint8 *start = (Uint8 *)surface->pixels; + Uint8 *end = start + (height*pitch); + Uint8 *bits = end-pitch, *spot; + int ofs = 0; + Uint8 ch; + Uint8 needsPad; + +#define COPY_PIXEL(x) spot = &bits[ofs++]; if(spot >= start && spot < end) *spot = (x) + + for (;;) { + if ( !SDL_RWread(src, &ch, 1, 1) ) return 1; + /* + | encoded mode starts with a run length, and then a byte + | with two colour indexes to alternate between for the run + */ + if ( ch ) { + Uint8 pixel; + if ( !SDL_RWread(src, &pixel, 1, 1) ) return 1; + if ( isRle8 ) { /* 256-color bitmap, compressed */ + do { + COPY_PIXEL(pixel); + } while (--ch); + } else { /* 16-color bitmap, compressed */ + Uint8 pixel0 = pixel >> 4; + Uint8 pixel1 = pixel & 0x0F; + for (;;) { + COPY_PIXEL(pixel0); /* even count, high nibble */ + if (!--ch) break; + COPY_PIXEL(pixel1); /* odd count, low nibble */ + if (!--ch) break; + } + } + } else { + /* + | A leading zero is an escape; it may signal the end of the bitmap, + | a cursor move, or some absolute data. + | zero tag may be absolute mode or an escape + */ + if ( !SDL_RWread(src, &ch, 1, 1) ) return 1; + switch (ch) { + case 0: /* end of line */ + ofs = 0; + bits -= pitch; /* go to previous */ + break; + case 1: /* end of bitmap */ + return 0; /* success! */ + case 2: /* delta */ + if ( !SDL_RWread(src, &ch, 1, 1) ) return 1; + ofs += ch; + if ( !SDL_RWread(src, &ch, 1, 1) ) return 1; + bits -= (ch * pitch); + break; + default: /* no compression */ + if (isRle8) { + needsPad = ( ch & 1 ); + do { + Uint8 pixel; + if ( !SDL_RWread(src, &pixel, 1, 1) ) return 1; + COPY_PIXEL(pixel); + } while (--ch); + } else { + needsPad = ( ((ch+1)>>1) & 1 ); /* (ch+1)>>1: bytes size */ + for (;;) { + Uint8 pixel; + if ( !SDL_RWread(src, &pixel, 1, 1) ) return 1; + COPY_PIXEL(pixel >> 4); + if (!--ch) break; + COPY_PIXEL(pixel & 0x0F); + if (!--ch) break; + } + } + /* pad at even boundary */ + if ( needsPad && !SDL_RWread(src, &ch, 1, 1) ) return 1; + break; + } + } + } +} + +static void CorrectAlphaChannel(SDL_Surface *surface) +{ + /* Check to see if there is any alpha channel data */ + SDL_bool hasAlpha = SDL_FALSE; +#if SDL_BYTEORDER == SDL_BIG_ENDIAN + int alphaChannelOffset = 0; +#else + int alphaChannelOffset = 3; +#endif + Uint8 *alpha = ((Uint8*)surface->pixels) + alphaChannelOffset; + Uint8 *end = alpha + surface->h * surface->pitch; + + while (alpha < end) { + if (*alpha != 0) { + hasAlpha = SDL_TRUE; + break; + } + alpha += 4; + } + + if (!hasAlpha) { + alpha = ((Uint8*)surface->pixels) + alphaChannelOffset; + while (alpha < end) { + *alpha = SDL_ALPHA_OPAQUE; + alpha += 4; + } + } +} + +static SDL_Surface *LoadBMP_RW (SDL_RWops *src, int freesrc) +{ + SDL_bool was_error; + Sint64 fp_offset; + int bmpPitch; + int i, pad; + SDL_Surface *surface; + Uint32 Rmask; + Uint32 Gmask; + Uint32 Bmask; + Uint32 Amask; + SDL_Palette *palette; + Uint8 *bits; + Uint8 *top, *end; + SDL_bool topDown; + int ExpandBMP; + SDL_bool correctAlpha = SDL_FALSE; + + /* The Win32 BMP file header (14 bytes) */ + char magic[2]; + Uint32 bfSize; + Uint16 bfReserved1; + Uint16 bfReserved2; + Uint32 bfOffBits; + + /* The Win32 BITMAPINFOHEADER struct (40 bytes) */ + Uint32 biSize; + Sint32 biWidth; + Sint32 biHeight; + Uint16 biPlanes; + Uint16 biBitCount; + Uint32 biCompression; + Uint32 biSizeImage; + Sint32 biXPelsPerMeter; + Sint32 biYPelsPerMeter; + Uint32 biClrUsed; + Uint32 biClrImportant; + + /* Make sure we are passed a valid data source */ + surface = NULL; + was_error = SDL_FALSE; + if ( src == NULL ) { + was_error = SDL_TRUE; + goto done; + } + + /* Read in the BMP file header */ + fp_offset = SDL_RWtell(src); + SDL_ClearError(); + if ( SDL_RWread(src, magic, 1, 2) != 2 ) { + SDL_Error(SDL_EFREAD); + was_error = SDL_TRUE; + goto done; + } + if ( SDL_strncmp(magic, "BM", 2) != 0 ) { + IMG_SetError("File is not a Windows BMP file"); + was_error = SDL_TRUE; + goto done; + } + bfSize = SDL_ReadLE32(src); + bfReserved1 = SDL_ReadLE16(src); + bfReserved2 = SDL_ReadLE16(src); + bfOffBits = SDL_ReadLE32(src); + + /* Read the Win32 BITMAPINFOHEADER */ + biSize = SDL_ReadLE32(src); + if ( biSize == 12 ) { + biWidth = (Uint32)SDL_ReadLE16(src); + biHeight = (Uint32)SDL_ReadLE16(src); + biPlanes = SDL_ReadLE16(src); + biBitCount = SDL_ReadLE16(src); + biCompression = BI_RGB; + biSizeImage = 0; + biXPelsPerMeter = 0; + biYPelsPerMeter = 0; + biClrUsed = 0; + biClrImportant = 0; + } else { + biWidth = SDL_ReadLE32(src); + biHeight = SDL_ReadLE32(src); + biPlanes = SDL_ReadLE16(src); + biBitCount = SDL_ReadLE16(src); + biCompression = SDL_ReadLE32(src); + biSizeImage = SDL_ReadLE32(src); + biXPelsPerMeter = SDL_ReadLE32(src); + biYPelsPerMeter = SDL_ReadLE32(src); + biClrUsed = SDL_ReadLE32(src); + biClrImportant = SDL_ReadLE32(src); + } + if (biHeight < 0) { + topDown = SDL_TRUE; + biHeight = -biHeight; + } else { + topDown = SDL_FALSE; + } + + /* Check for read error */ + if ( strcmp(SDL_GetError(), "") != 0 ) { + was_error = SDL_TRUE; + goto done; + } + + /* Expand 1 and 4 bit bitmaps to 8 bits per pixel */ + switch (biBitCount) { + case 1: + case 4: + ExpandBMP = biBitCount; + biBitCount = 8; + break; + default: + ExpandBMP = 0; + break; + } + + /* RLE4 and RLE8 BMP compression is supported */ + Rmask = Gmask = Bmask = Amask = 0; + switch (biCompression) { + case BI_RGB: + /* If there are no masks, use the defaults */ + if ( bfOffBits == (14+biSize) ) { + /* Default values for the BMP format */ + switch (biBitCount) { + case 15: + case 16: + Rmask = 0x7C00; + Gmask = 0x03E0; + Bmask = 0x001F; + break; + case 24: +#if SDL_BYTEORDER == SDL_BIG_ENDIAN + Rmask = 0x000000FF; + Gmask = 0x0000FF00; + Bmask = 0x00FF0000; +#else + Rmask = 0x00FF0000; + Gmask = 0x0000FF00; + Bmask = 0x000000FF; +#endif + break; + case 32: + /* We don't know if this has alpha channel or not */ + correctAlpha = SDL_TRUE; + Amask = 0xFF000000; + Rmask = 0x00FF0000; + Gmask = 0x0000FF00; + Bmask = 0x000000FF; + break; + default: + break; + } + break; + } + /* Fall through -- read the RGB masks */ + + default: + switch (biBitCount) { + case 15: + case 16: + Rmask = SDL_ReadLE32(src); + Gmask = SDL_ReadLE32(src); + Bmask = SDL_ReadLE32(src); + break; + case 32: + Rmask = SDL_ReadLE32(src); + Gmask = SDL_ReadLE32(src); + Bmask = SDL_ReadLE32(src); + Amask = SDL_ReadLE32(src); + break; + default: + break; + } + break; + } + + /* Create a compatible surface, note that the colors are RGB ordered */ + surface = SDL_CreateRGBSurface(SDL_SWSURFACE, + biWidth, biHeight, biBitCount, Rmask, Gmask, Bmask, Amask); + if ( surface == NULL ) { + was_error = SDL_TRUE; + goto done; + } + + /* Load the palette, if any */ + palette = (surface->format)->palette; + if ( palette ) { + if ( SDL_RWseek(src, fp_offset+14+biSize, RW_SEEK_SET) < 0 ) { + SDL_Error(SDL_EFSEEK); + was_error = SDL_TRUE; + goto done; + } + + /* + | guich: always use 1<colors[i].b, 1, 1); + SDL_RWread(src, &palette->colors[i].g, 1, 1); + SDL_RWread(src, &palette->colors[i].r, 1, 1); + palette->colors[i].a = SDL_ALPHA_OPAQUE; + } + } else { + for ( i = 0; i < (int)biClrUsed; ++i ) { + SDL_RWread(src, &palette->colors[i].b, 1, 1); + SDL_RWread(src, &palette->colors[i].g, 1, 1); + SDL_RWread(src, &palette->colors[i].r, 1, 1); + SDL_RWread(src, &palette->colors[i].a, 1, 1); + + /* According to Microsoft documentation, the fourth element + is reserved and must be zero, so we shouldn't treat it as + alpha. + */ + palette->colors[i].a = SDL_ALPHA_OPAQUE; + } + } + palette->ncolors = biClrUsed; + } + + /* Read the surface pixels. Note that the bmp image is upside down */ + if ( SDL_RWseek(src, fp_offset+bfOffBits, RW_SEEK_SET) < 0 ) { + SDL_Error(SDL_EFSEEK); + was_error = SDL_TRUE; + goto done; + } + if ((biCompression == BI_RLE4) || (biCompression == BI_RLE8)) { + was_error = (SDL_bool)readRlePixels(surface, src, biCompression == BI_RLE8); + if (was_error) IMG_SetError("Error reading from BMP"); + goto done; + } + top = (Uint8 *)surface->pixels; + end = (Uint8 *)surface->pixels+(surface->h*surface->pitch); + switch (ExpandBMP) { + case 1: + bmpPitch = (biWidth + 7) >> 3; + pad = (((bmpPitch)%4) ? (4-((bmpPitch)%4)) : 0); + break; + case 4: + bmpPitch = (biWidth + 1) >> 1; + pad = (((bmpPitch)%4) ? (4-((bmpPitch)%4)) : 0); + break; + default: + pad = ((surface->pitch%4) ? + (4-(surface->pitch%4)) : 0); + break; + } + if ( topDown ) { + bits = top; + } else { + bits = end - surface->pitch; + } + while ( bits >= top && bits < end ) { + switch (ExpandBMP) { + case 1: + case 4: { + Uint8 pixel = 0; + int shift = (8-ExpandBMP); + for ( i=0; iw; ++i ) { + if ( i%(8/ExpandBMP) == 0 ) { + if ( !SDL_RWread(src, &pixel, 1, 1) ) { + IMG_SetError("Error reading from BMP"); + was_error = SDL_TRUE; + goto done; + } + } + *(bits+i) = (pixel>>shift); + pixel <<= ExpandBMP; + } } + break; + + default: + if ( SDL_RWread(src, bits, 1, surface->pitch) != surface->pitch ) { + SDL_Error(SDL_EFREAD); + was_error = SDL_TRUE; + goto done; + } +#if SDL_BYTEORDER == SDL_BIG_ENDIAN + /* Byte-swap the pixels if needed. Note that the 24bpp + case has already been taken care of above. */ + switch(biBitCount) { + case 15: + case 16: { + Uint16 *pix = (Uint16 *)bits; + for(i = 0; i < surface->w; i++) + pix[i] = SDL_Swap16(pix[i]); + break; + } + + case 32: { + Uint32 *pix = (Uint32 *)bits; + for(i = 0; i < surface->w; i++) + pix[i] = SDL_Swap32(pix[i]); + break; + } + } +#endif + break; + } + /* Skip padding bytes, ugh */ + if ( pad ) { + Uint8 padbyte; + for ( i=0; ipitch; + } else { + bits -= surface->pitch; + } + } + if (correctAlpha) { + CorrectAlphaChannel(surface); + } +done: + if ( was_error ) { + if ( src ) { + SDL_RWseek(src, fp_offset, RW_SEEK_SET); + } + if ( surface ) { + SDL_FreeSurface(surface); + } + surface = NULL; + } + if ( freesrc && src ) { + SDL_RWclose(src); + } + return(surface); +} + +static Uint8 +SDL_Read8(SDL_RWops * src) +{ + Uint8 value; + + SDL_RWread(src, &value, 1, 1); + return (value); +} + +static SDL_Surface * +LoadICOCUR_RW(SDL_RWops * src, int type, int freesrc) +{ + SDL_bool was_error; + Sint64 fp_offset; + int bmpPitch; + int i, pad; + SDL_Surface *surface; + Uint32 Rmask; + Uint32 Gmask; + Uint32 Bmask; + Uint8 *bits; + int ExpandBMP; + int maxCol = 0; + int icoOfs = 0; + Uint32 palette[256]; + + /* The Win32 ICO file header (14 bytes) */ + Uint16 bfReserved; + Uint16 bfType; + Uint16 bfCount; + + /* The Win32 BITMAPINFOHEADER struct (40 bytes) */ + Uint32 biSize; + Sint32 biWidth; + Sint32 biHeight; + Uint16 biPlanes; + Uint16 biBitCount; + Uint32 biCompression; + Uint32 biSizeImage; + Sint32 biXPelsPerMeter; + Sint32 biYPelsPerMeter; + Uint32 biClrUsed; + Uint32 biClrImportant; + + /* Make sure we are passed a valid data source */ + surface = NULL; + was_error = SDL_FALSE; + if (src == NULL) { + was_error = SDL_TRUE; + goto done; + } + + /* Read in the ICO file header */ + fp_offset = SDL_RWtell(src); + SDL_ClearError(); + + bfReserved = SDL_ReadLE16(src); + bfType = SDL_ReadLE16(src); + bfCount = SDL_ReadLE16(src); + if ((bfReserved != 0) || (bfType != type) || (bfCount == 0)) { + IMG_SetError("File is not a Windows %s file", type == 1 ? "ICO" : "CUR"); + was_error = SDL_TRUE; + goto done; + } + + /* Read the Win32 Icon Directory */ + for (i = 0; i < bfCount; i++) { + /* Icon Directory Entries */ + int bWidth = SDL_Read8(src); /* Uint8, but 0 = 256 ! */ + int bHeight = SDL_Read8(src); /* Uint8, but 0 = 256 ! */ + int bColorCount = SDL_Read8(src); /* Uint8, but 0 = 256 ! */ + Uint8 bReserved = SDL_Read8(src); + Uint16 wPlanes = SDL_ReadLE16(src); + Uint16 wBitCount = SDL_ReadLE16(src); + Uint32 dwBytesInRes = SDL_ReadLE32(src); + Uint32 dwImageOffset = SDL_ReadLE32(src); + + if (!bWidth) + bWidth = 256; + if (!bHeight) + bHeight = 256; + if (!bColorCount) + bColorCount = 256; + + //printf("%dx%d@%d - %08x\n", bWidth, bHeight, bColorCount, dwImageOffset); + if (bColorCount > maxCol) { + maxCol = bColorCount; + icoOfs = dwImageOffset; + //printf("marked\n"); + } + } + + /* Advance to the DIB Data */ + if (SDL_RWseek(src, icoOfs, RW_SEEK_SET) < 0) { + SDL_Error(SDL_EFSEEK); + was_error = SDL_TRUE; + goto done; + } + + /* Read the Win32 BITMAPINFOHEADER */ + biSize = SDL_ReadLE32(src); + if (biSize == 40) { + biWidth = SDL_ReadLE32(src); + biHeight = SDL_ReadLE32(src); + biPlanes = SDL_ReadLE16(src); + biBitCount = SDL_ReadLE16(src); + biCompression = SDL_ReadLE32(src); + biSizeImage = SDL_ReadLE32(src); + biXPelsPerMeter = SDL_ReadLE32(src); + biYPelsPerMeter = SDL_ReadLE32(src); + biClrUsed = SDL_ReadLE32(src); + biClrImportant = SDL_ReadLE32(src); + } else { + IMG_SetError("Unsupported ICO bitmap format"); + was_error = SDL_TRUE; + goto done; + } + + /* Check for read error */ + if (SDL_strcmp(SDL_GetError(), "") != 0) { + was_error = SDL_TRUE; + goto done; + } + + /* We don't support any BMP compression right now */ + switch (biCompression) { + case BI_RGB: + /* Default values for the BMP format */ + switch (biBitCount) { + case 1: + case 4: + ExpandBMP = biBitCount; + biBitCount = 8; + break; + case 8: + ExpandBMP = 8; + break; + case 32: + Rmask = 0x00FF0000; + Gmask = 0x0000FF00; + Bmask = 0x000000FF; + ExpandBMP = 0; + break; + default: + IMG_SetError("ICO file with unsupported bit count"); + was_error = SDL_TRUE; + goto done; + } + break; + default: + IMG_SetError("Compressed ICO files not supported"); + was_error = SDL_TRUE; + goto done; + } + + /* Create a RGBA surface */ + biHeight = biHeight >> 1; + //printf("%d x %d\n", biWidth, biHeight); + surface = + SDL_CreateRGBSurface(0, biWidth, biHeight, 32, 0x00FF0000, + 0x0000FF00, 0x000000FF, 0xFF000000); + if (surface == NULL) { + was_error = SDL_TRUE; + goto done; + } + + /* Load the palette, if any */ + //printf("bc %d bused %d\n", biBitCount, biClrUsed); + if (biBitCount <= 8) { + if (biClrUsed == 0) { + biClrUsed = 1 << biBitCount; + } + for (i = 0; i < (int) biClrUsed; ++i) { + SDL_RWread(src, &palette[i], 4, 1); + } + } + + /* Read the surface pixels. Note that the bmp image is upside down */ + bits = (Uint8 *) surface->pixels + (surface->h * surface->pitch); + switch (ExpandBMP) { + case 1: + bmpPitch = (biWidth + 7) >> 3; + pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0); + break; + case 4: + bmpPitch = (biWidth + 1) >> 1; + pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0); + break; + case 8: + bmpPitch = biWidth; + pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0); + break; + default: + bmpPitch = biWidth * 4; + pad = 0; + break; + } + while (bits > (Uint8 *) surface->pixels) { + bits -= surface->pitch; + switch (ExpandBMP) { + case 1: + case 4: + case 8: + { + Uint8 pixel = 0; + int shift = (8 - ExpandBMP); + for (i = 0; i < surface->w; ++i) { + if (i % (8 / ExpandBMP) == 0) { + if (!SDL_RWread(src, &pixel, 1, 1)) { + IMG_SetError("Error reading from ICO"); + was_error = SDL_TRUE; + goto done; + } + } + *((Uint32 *) bits + i) = (palette[pixel >> shift]); + pixel <<= ExpandBMP; + } + } + break; + + default: + if (SDL_RWread(src, bits, 1, surface->pitch) + != surface->pitch) { + SDL_Error(SDL_EFREAD); + was_error = SDL_TRUE; + goto done; + } + break; + } + /* Skip padding bytes, ugh */ + if (pad) { + Uint8 padbyte; + for (i = 0; i < pad; ++i) { + SDL_RWread(src, &padbyte, 1, 1); + } + } + } + /* Read the mask pixels. Note that the bmp image is upside down */ + bits = (Uint8 *) surface->pixels + (surface->h * surface->pitch); + ExpandBMP = 1; + bmpPitch = (biWidth + 7) >> 3; + pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0); + while (bits > (Uint8 *) surface->pixels) { + Uint8 pixel = 0; + int shift = (8 - ExpandBMP); + + bits -= surface->pitch; + for (i = 0; i < surface->w; ++i) { + if (i % (8 / ExpandBMP) == 0) { + if (!SDL_RWread(src, &pixel, 1, 1)) { + IMG_SetError("Error reading from ICO"); + was_error = SDL_TRUE; + goto done; + } + } + *((Uint32 *) bits + i) |= ((pixel >> shift) ? 0 : 0xFF000000); + pixel <<= ExpandBMP; + } + /* Skip padding bytes, ugh */ + if (pad) { + Uint8 padbyte; + for (i = 0; i < pad; ++i) { + SDL_RWread(src, &padbyte, 1, 1); + } + } + } + done: + if (was_error) { + if (src) { + SDL_RWseek(src, fp_offset, RW_SEEK_SET); + } + if (surface) { + SDL_FreeSurface(surface); + } + surface = NULL; + } + if (freesrc && src) { + SDL_RWclose(src); + } + return (surface); +} + +/* Load a BMP type image from an SDL datasource */ +SDL_Surface *IMG_LoadBMP_RW(SDL_RWops *src) +{ + return(LoadBMP_RW(src, 0)); +} + +/* Load a ICO type image from an SDL datasource */ +SDL_Surface *IMG_LoadICO_RW(SDL_RWops *src) +{ + return(LoadICOCUR_RW(src, 1, 0)); +} + +/* Load a CUR type image from an SDL datasource */ +SDL_Surface *IMG_LoadCUR_RW(SDL_RWops *src) +{ + return(LoadICOCUR_RW(src, 2, 0)); +} + +#else + +/* See if an image is contained in a data source */ +int IMG_isBMP(SDL_RWops *src) +{ + return(0); +} + +int IMG_isICO(SDL_RWops *src) +{ + return(0); +} + +int IMG_isCUR(SDL_RWops *src) +{ + return(0); +} + +/* Load a BMP type image from an SDL datasource */ +SDL_Surface *IMG_LoadBMP_RW(SDL_RWops *src) +{ + return(NULL); +} + +/* Load a BMP type image from an SDL datasource */ +SDL_Surface *IMG_LoadCUR_RW(SDL_RWops *src) +{ + return(NULL); +} + +/* Load a BMP type image from an SDL datasource */ +SDL_Surface *IMG_LoadICO_RW(SDL_RWops *src) +{ + return(NULL); +} + +#endif /* LOAD_BMP */ + +#endif /* !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) */ diff --git a/project/jni/sdl2_image/IMG_gif.c b/project/jni/sdl2_image/IMG_gif.c new file mode 100644 index 000000000..aef686362 --- /dev/null +++ b/project/jni/sdl2_image/IMG_gif.c @@ -0,0 +1,636 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +#if !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) + +/* This is a GIF image file loading framework */ + +#include +#include + +#include "SDL_image.h" + +#ifdef LOAD_GIF + +/* See if an image is contained in a data source */ +int IMG_isGIF(SDL_RWops *src) +{ + Sint64 start; + int is_GIF; + char magic[6]; + + if ( !src ) + return 0; + start = SDL_RWtell(src); + is_GIF = 0; + if ( SDL_RWread(src, magic, sizeof(magic), 1) ) { + if ( (SDL_strncmp(magic, "GIF", 3) == 0) && + ((SDL_memcmp(magic + 3, "87a", 3) == 0) || + (SDL_memcmp(magic + 3, "89a", 3) == 0)) ) { + is_GIF = 1; + } + } + SDL_RWseek(src, start, RW_SEEK_SET); + return(is_GIF); +} + +/* Code from here to end of file has been adapted from XPaint: */ +/* +-------------------------------------------------------------------+ */ +/* | Copyright 1990, 1991, 1993 David Koblas. | */ +/* | Copyright 1996 Torsten Martinsen. | */ +/* | Permission to use, copy, modify, and distribute this software | */ +/* | and its documentation for any purpose and without fee is hereby | */ +/* | granted, provided that the above copyright notice appear in all | */ +/* | copies and that both that copyright notice and this permission | */ +/* | notice appear in supporting documentation. This software is | */ +/* | provided "as is" without express or implied warranty. | */ +/* +-------------------------------------------------------------------+ */ + +/* Adapted for use in SDL by Sam Lantinga -- 7/20/98 */ +#define USED_BY_SDL + +#include +#include + +#ifdef USED_BY_SDL +/* Changes to work with SDL: + + Include SDL header file + Use SDL_Surface rather than xpaint Image structure + Define SDL versions of RWSetMsg(), ImageNewCmap() and ImageSetCmap() +*/ +#include "SDL.h" + +#define Image SDL_Surface +#define RWSetMsg IMG_SetError +#define ImageNewCmap(w, h, s) SDL_CreateRGBSurface(SDL_SWSURFACE,w,h,8,0,0,0,0) +#define ImageSetCmap(s, i, R, G, B) do { \ + s->format->palette->colors[i].r = R; \ + s->format->palette->colors[i].g = G; \ + s->format->palette->colors[i].b = B; \ + } while (0) +/* * * * * */ + +#else + +/* Original XPaint sources */ + +#include "image.h" +#include "rwTable.h" + +#define SDL_RWops FILE +#define SDL_RWclose fclose + +#endif /* USED_BY_SDL */ + + +#define MAXCOLORMAPSIZE 256 + +#define TRUE 1 +#define FALSE 0 + +#define CM_RED 0 +#define CM_GREEN 1 +#define CM_BLUE 2 + +#define MAX_LWZ_BITS 12 + +#define INTERLACE 0x40 +#define LOCALCOLORMAP 0x80 +#define BitSet(byte, bit) (((byte) & (bit)) == (bit)) + +#define ReadOK(file,buffer,len) SDL_RWread(file, buffer, len, 1) + +#define LM_to_uint(a,b) (((b)<<8)|(a)) + +static struct { + unsigned int Width; + unsigned int Height; + unsigned char ColorMap[3][MAXCOLORMAPSIZE]; + unsigned int BitPixel; + unsigned int ColorResolution; + unsigned int Background; + unsigned int AspectRatio; + int GrayScale; +} GifScreen; + +static struct { + int transparent; + int delayTime; + int inputFlag; + int disposal; +} Gif89; + +static int ReadColorMap(SDL_RWops * src, int number, + unsigned char buffer[3][MAXCOLORMAPSIZE], int *flag); +static int DoExtension(SDL_RWops * src, int label); +static int GetDataBlock(SDL_RWops * src, unsigned char *buf); +static int GetCode(SDL_RWops * src, int code_size, int flag); +static int LWZReadByte(SDL_RWops * src, int flag, int input_code_size); +static Image *ReadImage(SDL_RWops * src, int len, int height, int, + unsigned char cmap[3][MAXCOLORMAPSIZE], + int gray, int interlace, int ignore); + +Image * +IMG_LoadGIF_RW(SDL_RWops *src) +{ + Sint64 start; + unsigned char buf[16]; + unsigned char c; + unsigned char localColorMap[3][MAXCOLORMAPSIZE]; + int grayScale; + int useGlobalColormap; + int bitPixel; + int imageCount = 0; + char version[4]; + int imageNumber = 1; + Image *image = NULL; + + if ( src == NULL ) { + return NULL; + } + start = SDL_RWtell(src); + + if (!ReadOK(src, buf, 6)) { + RWSetMsg("error reading magic number"); + goto done; + } + if (SDL_strncmp((char *) buf, "GIF", 3) != 0) { + RWSetMsg("not a GIF file"); + goto done; + } + SDL_memcpy(version, (char *) buf + 3, 3); + version[3] = '\0'; + + if ((SDL_strcmp(version, "87a") != 0) && (SDL_strcmp(version, "89a") != 0)) { + RWSetMsg("bad version number, not '87a' or '89a'"); + goto done; + } + Gif89.transparent = -1; + Gif89.delayTime = -1; + Gif89.inputFlag = -1; + Gif89.disposal = 0; + + if (!ReadOK(src, buf, 7)) { + RWSetMsg("failed to read screen descriptor"); + goto done; + } + GifScreen.Width = LM_to_uint(buf[0], buf[1]); + GifScreen.Height = LM_to_uint(buf[2], buf[3]); + GifScreen.BitPixel = 2 << (buf[4] & 0x07); + GifScreen.ColorResolution = (((buf[4] & 0x70) >> 3) + 1); + GifScreen.Background = buf[5]; + GifScreen.AspectRatio = buf[6]; + + if (BitSet(buf[4], LOCALCOLORMAP)) { /* Global Colormap */ + if (ReadColorMap(src, GifScreen.BitPixel, GifScreen.ColorMap, + &GifScreen.GrayScale)) { + RWSetMsg("error reading global colormap"); + goto done; + } + } + do { + if (!ReadOK(src, &c, 1)) { + RWSetMsg("EOF / read error on image data"); + goto done; + } + if (c == ';') { /* GIF terminator */ + if (imageCount < imageNumber) { + RWSetMsg("only %d image%s found in file", + imageCount, imageCount > 1 ? "s" : ""); + goto done; + } + } + if (c == '!') { /* Extension */ + if (!ReadOK(src, &c, 1)) { + RWSetMsg("EOF / read error on extention function code"); + goto done; + } + DoExtension(src, c); + continue; + } + if (c != ',') { /* Not a valid start character */ + continue; + } + ++imageCount; + + if (!ReadOK(src, buf, 9)) { + RWSetMsg("couldn't read left/top/width/height"); + goto done; + } + useGlobalColormap = !BitSet(buf[8], LOCALCOLORMAP); + + bitPixel = 1 << ((buf[8] & 0x07) + 1); + + if (!useGlobalColormap) { + if (ReadColorMap(src, bitPixel, localColorMap, &grayScale)) { + RWSetMsg("error reading local colormap"); + goto done; + } + image = ReadImage(src, LM_to_uint(buf[4], buf[5]), + LM_to_uint(buf[6], buf[7]), + bitPixel, localColorMap, grayScale, + BitSet(buf[8], INTERLACE), + imageCount != imageNumber); + } else { + image = ReadImage(src, LM_to_uint(buf[4], buf[5]), + LM_to_uint(buf[6], buf[7]), + GifScreen.BitPixel, GifScreen.ColorMap, + GifScreen.GrayScale, BitSet(buf[8], INTERLACE), + imageCount != imageNumber); + } + } while (image == NULL); + +#ifdef USED_BY_SDL + if ( Gif89.transparent >= 0 ) { + SDL_SetColorKey(image, SDL_TRUE, Gif89.transparent); + } +#endif + +done: + if ( image == NULL ) { + SDL_RWseek(src, start, RW_SEEK_SET); + } + return image; +} + +static int +ReadColorMap(SDL_RWops *src, int number, + unsigned char buffer[3][MAXCOLORMAPSIZE], int *gray) +{ + int i; + unsigned char rgb[3]; + int flag; + + flag = TRUE; + + for (i = 0; i < number; ++i) { + if (!ReadOK(src, rgb, sizeof(rgb))) { + RWSetMsg("bad colormap"); + return 1; + } + buffer[CM_RED][i] = rgb[0]; + buffer[CM_GREEN][i] = rgb[1]; + buffer[CM_BLUE][i] = rgb[2]; + flag &= (rgb[0] == rgb[1] && rgb[1] == rgb[2]); + } + +#if 0 + if (flag) + *gray = (number == 2) ? PBM_TYPE : PGM_TYPE; + else + *gray = PPM_TYPE; +#else + *gray = 0; +#endif + + return FALSE; +} + +static int +DoExtension(SDL_RWops *src, int label) +{ + static unsigned char buf[256]; + char *str; + + switch (label) { + case 0x01: /* Plain Text Extension */ + str = "Plain Text Extension"; + break; + case 0xff: /* Application Extension */ + str = "Application Extension"; + break; + case 0xfe: /* Comment Extension */ + str = "Comment Extension"; + while (GetDataBlock(src, (unsigned char *) buf) != 0) + ; + return FALSE; + case 0xf9: /* Graphic Control Extension */ + str = "Graphic Control Extension"; + (void) GetDataBlock(src, (unsigned char *) buf); + Gif89.disposal = (buf[0] >> 2) & 0x7; + Gif89.inputFlag = (buf[0] >> 1) & 0x1; + Gif89.delayTime = LM_to_uint(buf[1], buf[2]); + if ((buf[0] & 0x1) != 0) + Gif89.transparent = buf[3]; + + while (GetDataBlock(src, (unsigned char *) buf) != 0) + ; + return FALSE; + default: + str = (char *)buf; + SDL_snprintf(str, 256, "UNKNOWN (0x%02x)", label); + break; + } + + while (GetDataBlock(src, (unsigned char *) buf) != 0) + ; + + return FALSE; +} + +static int ZeroDataBlock = FALSE; + +static int +GetDataBlock(SDL_RWops *src, unsigned char *buf) +{ + unsigned char count; + + if (!ReadOK(src, &count, 1)) { + /* pm_message("error in getting DataBlock size" ); */ + return -1; + } + ZeroDataBlock = count == 0; + + if ((count != 0) && (!ReadOK(src, buf, count))) { + /* pm_message("error in reading DataBlock" ); */ + return -1; + } + return count; +} + +static int +GetCode(SDL_RWops *src, int code_size, int flag) +{ + static unsigned char buf[280]; + static int curbit, lastbit, done, last_byte; + int i, j, ret; + unsigned char count; + + if (flag) { + curbit = 0; + lastbit = 0; + done = FALSE; + return 0; + } + if ((curbit + code_size) >= lastbit) { + if (done) { + if (curbit >= lastbit) + RWSetMsg("ran off the end of my bits"); + return -1; + } + buf[0] = buf[last_byte - 2]; + buf[1] = buf[last_byte - 1]; + + if ((count = GetDataBlock(src, &buf[2])) == 0) + done = TRUE; + + last_byte = 2 + count; + curbit = (curbit - lastbit) + 16; + lastbit = (2 + count) * 8; + } + ret = 0; + for (i = curbit, j = 0; j < code_size; ++i, ++j) + ret |= ((buf[i / 8] & (1 << (i % 8))) != 0) << j; + + curbit += code_size; + + return ret; +} + +static int +LWZReadByte(SDL_RWops *src, int flag, int input_code_size) +{ + static int fresh = FALSE; + int code, incode; + static int code_size, set_code_size; + static int max_code, max_code_size; + static int firstcode, oldcode; + static int clear_code, end_code; + static int table[2][(1 << MAX_LWZ_BITS)]; + static int stack[(1 << (MAX_LWZ_BITS)) * 2], *sp; + register int i; + + /* Fixed buffer overflow found by Michael Skladnikiewicz */ + if (input_code_size > MAX_LWZ_BITS) + return -1; + + if (flag) { + set_code_size = input_code_size; + code_size = set_code_size + 1; + clear_code = 1 << set_code_size; + end_code = clear_code + 1; + max_code_size = 2 * clear_code; + max_code = clear_code + 2; + + GetCode(src, 0, TRUE); + + fresh = TRUE; + + for (i = 0; i < clear_code; ++i) { + table[0][i] = 0; + table[1][i] = i; + } + table[1][0] = 0; + for (; i < (1 << MAX_LWZ_BITS); ++i) + table[0][i] = 0; + + sp = stack; + + return 0; + } else if (fresh) { + fresh = FALSE; + do { + firstcode = oldcode = GetCode(src, code_size, FALSE); + } while (firstcode == clear_code); + return firstcode; + } + if (sp > stack) + return *--sp; + + while ((code = GetCode(src, code_size, FALSE)) >= 0) { + if (code == clear_code) { + for (i = 0; i < clear_code; ++i) { + table[0][i] = 0; + table[1][i] = i; + } + for (; i < (1 << MAX_LWZ_BITS); ++i) + table[0][i] = table[1][i] = 0; + code_size = set_code_size + 1; + max_code_size = 2 * clear_code; + max_code = clear_code + 2; + sp = stack; + firstcode = oldcode = GetCode(src, code_size, FALSE); + return firstcode; + } else if (code == end_code) { + int count; + unsigned char buf[260]; + + if (ZeroDataBlock) + return -2; + + while ((count = GetDataBlock(src, buf)) > 0) + ; + + if (count != 0) { + /* + * pm_message("missing EOD in data stream (common occurence)"); + */ + } + return -2; + } + incode = code; + + if (code >= max_code) { + *sp++ = firstcode; + code = oldcode; + } + while (code >= clear_code) { + /* Guard against buffer overruns */ + if (code < 0 || code >= (1 << MAX_LWZ_BITS)) { + RWSetMsg("invalid LWZ data"); + return -3; + } + *sp++ = table[1][code]; + if (code == table[0][code]) + RWSetMsg("circular table entry BIG ERROR"); + code = table[0][code]; + } + + /* Guard against buffer overruns */ + if (code < 0 || code >= (1 << MAX_LWZ_BITS)) { + RWSetMsg("invalid LWZ data"); + return -4; + } + *sp++ = firstcode = table[1][code]; + + if ((code = max_code) < (1 << MAX_LWZ_BITS)) { + table[0][code] = oldcode; + table[1][code] = firstcode; + ++max_code; + if ((max_code >= max_code_size) && + (max_code_size < (1 << MAX_LWZ_BITS))) { + max_code_size *= 2; + ++code_size; + } + } + oldcode = incode; + + if (sp > stack) + return *--sp; + } + return code; +} + +static Image * +ReadImage(SDL_RWops * src, int len, int height, int cmapSize, + unsigned char cmap[3][MAXCOLORMAPSIZE], + int gray, int interlace, int ignore) +{ + Image *image; + unsigned char c; + int i, v; + int xpos = 0, ypos = 0, pass = 0; + + /* + ** Initialize the compression routines + */ + if (!ReadOK(src, &c, 1)) { + RWSetMsg("EOF / read error on image data"); + return NULL; + } + if (LWZReadByte(src, TRUE, c) < 0) { + RWSetMsg("error reading image"); + return NULL; + } + /* + ** If this is an "uninteresting picture" ignore it. + */ + if (ignore) { + while (LWZReadByte(src, FALSE, c) >= 0) + ; + return NULL; + } + image = ImageNewCmap(len, height, cmapSize); + + for (i = 0; i < cmapSize; i++) + ImageSetCmap(image, i, cmap[CM_RED][i], + cmap[CM_GREEN][i], cmap[CM_BLUE][i]); + + while ((v = LWZReadByte(src, FALSE, c)) >= 0) { +#ifdef USED_BY_SDL + ((Uint8 *)image->pixels)[xpos + ypos * image->pitch] = v; +#else + image->data[xpos + ypos * len] = v; +#endif + ++xpos; + if (xpos == len) { + xpos = 0; + if (interlace) { + switch (pass) { + case 0: + case 1: + ypos += 8; + break; + case 2: + ypos += 4; + break; + case 3: + ypos += 2; + break; + } + + if (ypos >= height) { + ++pass; + switch (pass) { + case 1: + ypos = 4; + break; + case 2: + ypos = 2; + break; + case 3: + ypos = 1; + break; + default: + goto fini; + } + } + } else { + ++ypos; + } + } + if (ypos >= height) + break; + } + + fini: + + return image; +} + +#else + +/* See if an image is contained in a data source */ +int IMG_isGIF(SDL_RWops *src) +{ + return(0); +} + +/* Load a GIF type image from an SDL datasource */ +SDL_Surface *IMG_LoadGIF_RW(SDL_RWops *src) +{ + return(NULL); +} + +#endif /* LOAD_GIF */ + +#endif /* !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) */ diff --git a/project/jni/sdl2_image/IMG_jpg.c b/project/jni/sdl2_image/IMG_jpg.c new file mode 100644 index 000000000..d39d4bd9e --- /dev/null +++ b/project/jni/sdl2_image/IMG_jpg.c @@ -0,0 +1,495 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +#if !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) + +/* This is a JPEG image file loading framework */ + +#include +#include +#include + +#include "SDL_image.h" + +#ifdef LOAD_JPG + +#include + +#ifdef JPEG_TRUE /* MinGW version of jpeg-8.x renamed TRUE to JPEG_TRUE etc. */ + typedef JPEG_boolean boolean; + #define TRUE JPEG_TRUE + #define FALSE JPEG_FALSE +#endif + +/* Define this for fast loading and not as good image quality */ +/*#define FAST_JPEG*/ + +/* Define this for quicker (but less perfect) JPEG identification */ +#define FAST_IS_JPEG + +static struct { + int loaded; + void *handle; + void (*jpeg_calc_output_dimensions) (j_decompress_ptr cinfo); + void (*jpeg_CreateDecompress) (j_decompress_ptr cinfo, int version, size_t structsize); + void (*jpeg_destroy_decompress) (j_decompress_ptr cinfo); + boolean (*jpeg_finish_decompress) (j_decompress_ptr cinfo); + int (*jpeg_read_header) (j_decompress_ptr cinfo, boolean require_image); + JDIMENSION (*jpeg_read_scanlines) (j_decompress_ptr cinfo, JSAMPARRAY scanlines, JDIMENSION max_lines); + boolean (*jpeg_resync_to_restart) (j_decompress_ptr cinfo, int desired); + boolean (*jpeg_start_decompress) (j_decompress_ptr cinfo); + struct jpeg_error_mgr * (*jpeg_std_error) (struct jpeg_error_mgr * err); +} lib; + +#ifdef LOAD_JPG_DYNAMIC +int IMG_InitJPG() +{ + if ( lib.loaded == 0 ) { + lib.handle = SDL_LoadObject(LOAD_JPG_DYNAMIC); + if ( lib.handle == NULL ) { + return -1; + } + lib.jpeg_calc_output_dimensions = + (void (*) (j_decompress_ptr)) + SDL_LoadFunction(lib.handle, "jpeg_calc_output_dimensions"); + if ( lib.jpeg_calc_output_dimensions == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.jpeg_CreateDecompress = + (void (*) (j_decompress_ptr, int, size_t)) + SDL_LoadFunction(lib.handle, "jpeg_CreateDecompress"); + if ( lib.jpeg_CreateDecompress == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.jpeg_destroy_decompress = + (void (*) (j_decompress_ptr)) + SDL_LoadFunction(lib.handle, "jpeg_destroy_decompress"); + if ( lib.jpeg_destroy_decompress == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.jpeg_finish_decompress = + (boolean (*) (j_decompress_ptr)) + SDL_LoadFunction(lib.handle, "jpeg_finish_decompress"); + if ( lib.jpeg_finish_decompress == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.jpeg_read_header = + (int (*) (j_decompress_ptr, boolean)) + SDL_LoadFunction(lib.handle, "jpeg_read_header"); + if ( lib.jpeg_read_header == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.jpeg_read_scanlines = + (JDIMENSION (*) (j_decompress_ptr, JSAMPARRAY, JDIMENSION)) + SDL_LoadFunction(lib.handle, "jpeg_read_scanlines"); + if ( lib.jpeg_read_scanlines == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.jpeg_resync_to_restart = + (boolean (*) (j_decompress_ptr, int)) + SDL_LoadFunction(lib.handle, "jpeg_resync_to_restart"); + if ( lib.jpeg_resync_to_restart == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.jpeg_start_decompress = + (boolean (*) (j_decompress_ptr)) + SDL_LoadFunction(lib.handle, "jpeg_start_decompress"); + if ( lib.jpeg_start_decompress == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.jpeg_std_error = + (struct jpeg_error_mgr * (*) (struct jpeg_error_mgr *)) + SDL_LoadFunction(lib.handle, "jpeg_std_error"); + if ( lib.jpeg_std_error == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + } + ++lib.loaded; + + return 0; +} +void IMG_QuitJPG() +{ + if ( lib.loaded == 0 ) { + return; + } + if ( lib.loaded == 1 ) { + SDL_UnloadObject(lib.handle); + } + --lib.loaded; +} +#else +int IMG_InitJPG() +{ + if ( lib.loaded == 0 ) { + lib.jpeg_calc_output_dimensions = jpeg_calc_output_dimensions; + lib.jpeg_CreateDecompress = jpeg_CreateDecompress; + lib.jpeg_destroy_decompress = jpeg_destroy_decompress; + lib.jpeg_finish_decompress = jpeg_finish_decompress; + lib.jpeg_read_header = jpeg_read_header; + lib.jpeg_read_scanlines = jpeg_read_scanlines; + lib.jpeg_resync_to_restart = jpeg_resync_to_restart; + lib.jpeg_start_decompress = jpeg_start_decompress; + lib.jpeg_std_error = jpeg_std_error; + } + ++lib.loaded; + + return 0; +} +void IMG_QuitJPG() +{ + if ( lib.loaded == 0 ) { + return; + } + if ( lib.loaded == 1 ) { + } + --lib.loaded; +} +#endif /* LOAD_JPG_DYNAMIC */ + +/* See if an image is contained in a data source */ +int IMG_isJPG(SDL_RWops *src) +{ + Sint64 start; + int is_JPG; + int in_scan; + Uint8 magic[4]; + + /* This detection code is by Steaphan Greene */ + /* Blame me, not Sam, if this doesn't work right. */ + /* And don't forget to report the problem to the the sdl list too! */ + + if ( !src ) + return 0; + start = SDL_RWtell(src); + is_JPG = 0; + in_scan = 0; + if ( SDL_RWread(src, magic, 2, 1) ) { + if ( (magic[0] == 0xFF) && (magic[1] == 0xD8) ) { + is_JPG = 1; + while (is_JPG == 1) { + if(SDL_RWread(src, magic, 1, 2) != 2) { + is_JPG = 0; + } else if( (magic[0] != 0xFF) && (in_scan == 0) ) { + is_JPG = 0; + } else if( (magic[0] != 0xFF) || (magic[1] == 0xFF) ) { + /* Extra padding in JPEG (legal) */ + /* or this is data and we are scanning */ + SDL_RWseek(src, -1, RW_SEEK_CUR); + } else if(magic[1] == 0xD9) { + /* Got to end of good JPEG */ + break; + } else if( (in_scan == 1) && (magic[1] == 0x00) ) { + /* This is an encoded 0xFF within the data */ + } else if( (magic[1] >= 0xD0) && (magic[1] < 0xD9) ) { + /* These have nothing else */ + } else if(SDL_RWread(src, magic+2, 1, 2) != 2) { + is_JPG = 0; + } else { + /* Yes, it's big-endian */ + Sint64 innerStart; + Uint32 size; + Sint64 end; + innerStart = SDL_RWtell(src); + size = (magic[2] << 8) + magic[3]; + end = SDL_RWseek(src, size-2, RW_SEEK_CUR); + if ( end != innerStart + size - 2 ) is_JPG = 0; + if ( magic[1] == 0xDA ) { + /* Now comes the actual JPEG meat */ +#ifdef FAST_IS_JPEG + /* Ok, I'm convinced. It is a JPEG. */ + break; +#else + /* I'm not convinced. Prove it! */ + in_scan = 1; +#endif + } + } + } + } + } + SDL_RWseek(src, start, RW_SEEK_SET); + return(is_JPG); +} + +#define INPUT_BUFFER_SIZE 4096 +typedef struct { + struct jpeg_source_mgr pub; + + SDL_RWops *ctx; + Uint8 buffer[INPUT_BUFFER_SIZE]; +} my_source_mgr; + +/* + * Initialize source --- called by jpeg_read_header + * before any data is actually read. + */ +static void init_source (j_decompress_ptr cinfo) +{ + /* We don't actually need to do anything */ + return; +} + +/* + * Fill the input buffer --- called whenever buffer is emptied. + */ +static boolean fill_input_buffer (j_decompress_ptr cinfo) +{ + my_source_mgr * src = (my_source_mgr *) cinfo->src; + int nbytes; + + nbytes = SDL_RWread(src->ctx, src->buffer, 1, INPUT_BUFFER_SIZE); + if (nbytes <= 0) { + /* Insert a fake EOI marker */ + src->buffer[0] = (Uint8) 0xFF; + src->buffer[1] = (Uint8) JPEG_EOI; + nbytes = 2; + } + src->pub.next_input_byte = src->buffer; + src->pub.bytes_in_buffer = nbytes; + + return TRUE; +} + + +/* + * Skip data --- used to skip over a potentially large amount of + * uninteresting data (such as an APPn marker). + * + * Writers of suspendable-input applications must note that skip_input_data + * is not granted the right to give a suspension return. If the skip extends + * beyond the data currently in the buffer, the buffer can be marked empty so + * that the next read will cause a fill_input_buffer call that can suspend. + * Arranging for additional bytes to be discarded before reloading the input + * buffer is the application writer's problem. + */ +static void skip_input_data (j_decompress_ptr cinfo, long num_bytes) +{ + my_source_mgr * src = (my_source_mgr *) cinfo->src; + + /* Just a dumb implementation for now. Could use fseek() except + * it doesn't work on pipes. Not clear that being smart is worth + * any trouble anyway --- large skips are infrequent. + */ + if (num_bytes > 0) { + while (num_bytes > (long) src->pub.bytes_in_buffer) { + num_bytes -= (long) src->pub.bytes_in_buffer; + (void) src->pub.fill_input_buffer(cinfo); + /* note we assume that fill_input_buffer will never + * return FALSE, so suspension need not be handled. + */ + } + src->pub.next_input_byte += (size_t) num_bytes; + src->pub.bytes_in_buffer -= (size_t) num_bytes; + } +} + +/* + * Terminate source --- called by jpeg_finish_decompress + * after all data has been read. + */ +static void term_source (j_decompress_ptr cinfo) +{ + /* We don't actually need to do anything */ + return; +} + +/* + * Prepare for input from a stdio stream. + * The caller must have already opened the stream, and is responsible + * for closing it after finishing decompression. + */ +static void jpeg_SDL_RW_src (j_decompress_ptr cinfo, SDL_RWops *ctx) +{ + my_source_mgr *src; + + /* The source object and input buffer are made permanent so that a series + * of JPEG images can be read from the same file by calling jpeg_stdio_src + * only before the first one. (If we discarded the buffer at the end of + * one image, we'd likely lose the start of the next one.) + * This makes it unsafe to use this manager and a different source + * manager serially with the same JPEG object. Caveat programmer. + */ + if (cinfo->src == NULL) { /* first time for this JPEG object? */ + cinfo->src = (struct jpeg_source_mgr *) + (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, + sizeof(my_source_mgr)); + src = (my_source_mgr *) cinfo->src; + } + + src = (my_source_mgr *) cinfo->src; + src->pub.init_source = init_source; + src->pub.fill_input_buffer = fill_input_buffer; + src->pub.skip_input_data = skip_input_data; + src->pub.resync_to_restart = lib.jpeg_resync_to_restart; /* use default method */ + src->pub.term_source = term_source; + src->ctx = ctx; + src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */ + src->pub.next_input_byte = NULL; /* until buffer loaded */ +} + +struct my_error_mgr { + struct jpeg_error_mgr errmgr; + jmp_buf escape; +}; + +static void my_error_exit(j_common_ptr cinfo) +{ + struct my_error_mgr *err = (struct my_error_mgr *)cinfo->err; + longjmp(err->escape, 1); +} + +static void output_no_message(j_common_ptr cinfo) +{ + /* do nothing */ +} + +/* Load a JPEG type image from an SDL datasource */ +SDL_Surface *IMG_LoadJPG_RW(SDL_RWops *src) +{ + Sint64 start; + struct jpeg_decompress_struct cinfo; + JSAMPROW rowptr[1]; + SDL_Surface *volatile surface = NULL; + struct my_error_mgr jerr; + + if ( !src ) { + /* The error message has been set in SDL_RWFromFile */ + return NULL; + } + start = SDL_RWtell(src); + + if ( !IMG_Init(IMG_INIT_JPG) ) { + return NULL; + } + + /* Create a decompression structure and load the JPEG header */ + cinfo.err = lib.jpeg_std_error(&jerr.errmgr); + jerr.errmgr.error_exit = my_error_exit; + jerr.errmgr.output_message = output_no_message; + if(setjmp(jerr.escape)) { + /* If we get here, libjpeg found an error */ + lib.jpeg_destroy_decompress(&cinfo); + if ( surface != NULL ) { + SDL_FreeSurface(surface); + } + SDL_RWseek(src, start, RW_SEEK_SET); + IMG_SetError("JPEG loading error"); + return NULL; + } + + lib.jpeg_create_decompress(&cinfo); + jpeg_SDL_RW_src(&cinfo, src); + lib.jpeg_read_header(&cinfo, TRUE); + + if(cinfo.num_components == 4) { + /* Set 32-bit Raw output */ + cinfo.out_color_space = JCS_CMYK; + cinfo.quantize_colors = FALSE; + lib.jpeg_calc_output_dimensions(&cinfo); + + /* Allocate an output surface to hold the image */ + surface = SDL_CreateRGBSurface(SDL_SWSURFACE, + cinfo.output_width, cinfo.output_height, 32, +#if SDL_BYTEORDER == SDL_LIL_ENDIAN + 0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000); +#else + 0x0000FF00, 0x00FF0000, 0xFF000000, 0x000000FF); +#endif + } else { + /* Set 24-bit RGB output */ + cinfo.out_color_space = JCS_RGB; + cinfo.quantize_colors = FALSE; +#ifdef FAST_JPEG + cinfo.scale_num = 1; + cinfo.scale_denom = 1; + cinfo.dct_method = JDCT_FASTEST; + cinfo.do_fancy_upsampling = FALSE; +#endif + lib.jpeg_calc_output_dimensions(&cinfo); + + /* Allocate an output surface to hold the image */ + surface = SDL_CreateRGBSurface(SDL_SWSURFACE, + cinfo.output_width, cinfo.output_height, 24, +#if SDL_BYTEORDER == SDL_LIL_ENDIAN + 0x0000FF, 0x00FF00, 0xFF0000, +#else + 0xFF0000, 0x00FF00, 0x0000FF, +#endif + 0); + } + + if ( surface == NULL ) { + lib.jpeg_destroy_decompress(&cinfo); + SDL_RWseek(src, start, RW_SEEK_SET); + IMG_SetError("Out of memory"); + return NULL; + } + + /* Decompress the image */ + lib.jpeg_start_decompress(&cinfo); + while ( cinfo.output_scanline < cinfo.output_height ) { + rowptr[0] = (JSAMPROW)(Uint8 *)surface->pixels + + cinfo.output_scanline * surface->pitch; + lib.jpeg_read_scanlines(&cinfo, rowptr, (JDIMENSION) 1); + } + lib.jpeg_finish_decompress(&cinfo); + lib.jpeg_destroy_decompress(&cinfo); + + return(surface); +} + +#else + +int IMG_InitJPG() +{ + IMG_SetError("JPEG images are not supported"); + return(-1); +} + +void IMG_QuitJPG() +{ +} + +/* See if an image is contained in a data source */ +int IMG_isJPG(SDL_RWops *src) +{ + return(0); +} + +/* Load a JPEG type image from an SDL datasource */ +SDL_Surface *IMG_LoadJPG_RW(SDL_RWops *src) +{ + return(NULL); +} + +#endif /* LOAD_JPG */ + +#endif /* !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) */ diff --git a/project/jni/sdl2_image/IMG_lbm.c b/project/jni/sdl2_image/IMG_lbm.c new file mode 100644 index 000000000..7aeb3bff6 --- /dev/null +++ b/project/jni/sdl2_image/IMG_lbm.c @@ -0,0 +1,499 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/* This is a ILBM image file loading framework + Load IFF pictures, PBM & ILBM packing methods, with or without stencil + Written by Daniel Morais ( Daniel AT Morais DOT com ) in September 2001. + 24 bits ILBM files support added by Marc Le Douarain (http://www.multimania.com/mavati) + in December 2002. + EHB and HAM (specific Amiga graphic chip modes) support added by Marc Le Douarain + (http://www.multimania.com/mavati) in December 2003. + Stencil and colorkey fixes by David Raulo (david.raulo AT free DOT fr) in February 2004. + Buffer overflow fix in RLE decompression by David Raulo in January 2008. +*/ + +#include +#include +#include + +#include "SDL_endian.h" +#include "SDL_image.h" + +#ifdef LOAD_LBM + + +#define MAXCOLORS 256 + +/* Structure for an IFF picture ( BMHD = Bitmap Header ) */ + +typedef struct +{ + Uint16 w, h; /* width & height of the bitmap in pixels */ + Sint16 x, y; /* screen coordinates of the bitmap */ + Uint8 planes; /* number of planes of the bitmap */ + Uint8 mask; /* mask type ( 0 => no mask ) */ + Uint8 tcomp; /* compression type */ + Uint8 pad1; /* dummy value, for padding */ + Uint16 tcolor; /* transparent color */ + Uint8 xAspect, /* pixel aspect ratio */ + yAspect; + Sint16 Lpage; /* width of the screen in pixels */ + Sint16 Hpage; /* height of the screen in pixels */ +} BMHD; + +int IMG_isLBM( SDL_RWops *src ) +{ + Sint64 start; + int is_LBM; + Uint8 magic[4+4+4]; + + if ( !src ) + return 0; + start = SDL_RWtell(src); + is_LBM = 0; + if ( SDL_RWread( src, magic, sizeof(magic), 1 ) ) + { + if ( !SDL_memcmp( magic, "FORM", 4 ) && + ( !SDL_memcmp( magic + 8, "PBM ", 4 ) || + !SDL_memcmp( magic + 8, "ILBM", 4 ) ) ) + { + is_LBM = 1; + } + } + SDL_RWseek(src, start, RW_SEEK_SET); + return( is_LBM ); +} + +SDL_Surface *IMG_LoadLBM_RW( SDL_RWops *src ) +{ + Sint64 start; + SDL_Surface *Image; + Uint8 id[4], pbm, colormap[MAXCOLORS*3], *MiniBuf, *ptr, count, color, msk; + Uint32 size, bytesloaded, nbcolors; + Uint32 i, j, bytesperline, nbplanes, stencil, plane, h; + Uint32 remainingbytes; + Uint32 width; + BMHD bmhd; + char *error; + Uint8 flagHAM,flagEHB; + + Image = NULL; + error = NULL; + MiniBuf = NULL; + + if ( !src ) { + /* The error message has been set in SDL_RWFromFile */ + return NULL; + } + start = SDL_RWtell(src); + + if ( !SDL_RWread( src, id, 4, 1 ) ) + { + error="error reading IFF chunk"; + goto done; + } + + /* Should be the size of the file minus 4+4 ( 'FORM'+size ) */ + if ( !SDL_RWread( src, &size, 4, 1 ) ) + { + error="error reading IFF chunk size"; + goto done; + } + + /* As size is not used here, no need to swap it */ + + if ( SDL_memcmp( id, "FORM", 4 ) != 0 ) + { + error="not a IFF file"; + goto done; + } + + if ( !SDL_RWread( src, id, 4, 1 ) ) + { + error="error reading IFF chunk"; + goto done; + } + + pbm = 0; + + /* File format : PBM=Packed Bitmap, ILBM=Interleaved Bitmap */ + if ( !SDL_memcmp( id, "PBM ", 4 ) ) pbm = 1; + else if ( SDL_memcmp( id, "ILBM", 4 ) ) + { + error="not a IFF picture"; + goto done; + } + + nbcolors = 0; + + SDL_memset( &bmhd, 0, sizeof( BMHD ) ); + flagHAM = 0; + flagEHB = 0; + + while ( SDL_memcmp( id, "BODY", 4 ) != 0 ) + { + if ( !SDL_RWread( src, id, 4, 1 ) ) + { + error="error reading IFF chunk"; + goto done; + } + + if ( !SDL_RWread( src, &size, 4, 1 ) ) + { + error="error reading IFF chunk size"; + goto done; + } + + bytesloaded = 0; + + size = SDL_SwapBE32( size ); + + if ( !SDL_memcmp( id, "BMHD", 4 ) ) /* Bitmap header */ + { + if ( !SDL_RWread( src, &bmhd, sizeof( BMHD ), 1 ) ) + { + error="error reading BMHD chunk"; + goto done; + } + + bytesloaded = sizeof( BMHD ); + + bmhd.w = SDL_SwapBE16( bmhd.w ); + bmhd.h = SDL_SwapBE16( bmhd.h ); + bmhd.x = SDL_SwapBE16( bmhd.x ); + bmhd.y = SDL_SwapBE16( bmhd.y ); + bmhd.tcolor = SDL_SwapBE16( bmhd.tcolor ); + bmhd.Lpage = SDL_SwapBE16( bmhd.Lpage ); + bmhd.Hpage = SDL_SwapBE16( bmhd.Hpage ); + } + + if ( !SDL_memcmp( id, "CMAP", 4 ) ) /* palette ( Color Map ) */ + { + if ( !SDL_RWread( src, &colormap, size, 1 ) ) + { + error="error reading CMAP chunk"; + goto done; + } + + bytesloaded = size; + nbcolors = size / 3; + } + + if ( !SDL_memcmp( id, "CAMG", 4 ) ) /* Amiga ViewMode */ + { + Uint32 viewmodes; + if ( !SDL_RWread( src, &viewmodes, sizeof(viewmodes), 1 ) ) + { + error="error reading CAMG chunk"; + goto done; + } + + bytesloaded = size; + viewmodes = SDL_SwapBE32( viewmodes ); + if ( viewmodes & 0x0800 ) + flagHAM = 1; + if ( viewmodes & 0x0080 ) + flagEHB = 1; + } + + if ( SDL_memcmp( id, "BODY", 4 ) ) + { + if ( size & 1 ) ++size; /* padding ! */ + size -= bytesloaded; + /* skip the remaining bytes of this chunk */ + if ( size ) SDL_RWseek( src, size, RW_SEEK_CUR ); + } + } + + /* compute some usefull values, based on the bitmap header */ + + width = ( bmhd.w + 15 ) & 0xFFFFFFF0; /* Width in pixels modulo 16 */ + + bytesperline = ( ( bmhd.w + 15 ) / 16 ) * 2; + + nbplanes = bmhd.planes; + + if ( pbm ) /* File format : 'Packed Bitmap' */ + { + bytesperline *= 8; + nbplanes = 1; + } + + stencil = (bmhd.mask & 1); /* There is a mask ( 'stencil' ) */ + + /* Allocate memory for a temporary buffer ( used for + decompression/deinterleaving ) */ + + MiniBuf = (Uint8 *)SDL_malloc( bytesperline * (nbplanes + stencil) ); + if ( MiniBuf == NULL ) + { + error="no enough memory for temporary buffer"; + goto done; + } + + if ( ( Image = SDL_CreateRGBSurface( SDL_SWSURFACE, width, bmhd.h, (bmhd.planes==24 || flagHAM==1)?24:8, 0, 0, 0, 0 ) ) == NULL ) + goto done; + + if ( bmhd.mask & 2 ) /* There is a transparent color */ + SDL_SetColorKey( Image, SDL_TRUE, bmhd.tcolor ); + + /* Update palette informations */ + + /* There is no palette in 24 bits ILBM file */ + if ( nbcolors>0 && flagHAM==0 ) + { + /* FIXME: Should this include the stencil? See comment below */ + int nbrcolorsfinal = 1 << (nbplanes + stencil); + ptr = &colormap[0]; + + for ( i=0; iformat->palette->colors[i].r = *ptr++; + Image->format->palette->colors[i].g = *ptr++; + Image->format->palette->colors[i].b = *ptr++; + } + + /* Amiga EHB mode (Extra-Half-Bright) */ + /* 6 bitplanes mode with a 32 colors palette */ + /* The 32 last colors are the same but divided by 2 */ + /* Some Amiga pictures save 64 colors with 32 last wrong colors, */ + /* they shouldn't !, and here we overwrite these 32 bad colors. */ + if ( (nbcolors==32 || flagEHB ) && (1<format->palette->colors[i].r = (*ptr++)/2; + Image->format->palette->colors[i].g = (*ptr++)/2; + Image->format->palette->colors[i].b = (*ptr++)/2; + } + } + + /* If nbcolors < 2^nbplanes, repeat the colormap */ + /* This happens when pictures have a stencil mask */ + if ( nbrcolorsfinal > (1<format->palette->colors[i].r = Image->format->palette->colors[i%nbcolors].r; + Image->format->palette->colors[i].g = Image->format->palette->colors[i%nbcolors].g; + Image->format->palette->colors[i].b = Image->format->palette->colors[i%nbcolors].b; + } + if ( !pbm ) + Image->format->palette->ncolors = nbrcolorsfinal; + } + + /* Get the bitmap */ + + for ( h=0; h < bmhd.h; h++ ) + { + /* uncompress the datas of each planes */ + + for ( plane=0; plane < (nbplanes+stencil); plane++ ) + { + ptr = MiniBuf + ( plane * bytesperline ); + + remainingbytes = bytesperline; + + if ( bmhd.tcomp == 1 ) /* Datas are compressed */ + { + do + { + if ( !SDL_RWread( src, &count, 1, 1 ) ) + { + error="error reading BODY chunk"; + goto done; + } + + if ( count & 0x80 ) + { + count ^= 0xFF; + count += 2; /* now it */ + + if ( ( count > remainingbytes ) || !SDL_RWread( src, &color, 1, 1 ) ) + { + error="error reading BODY chunk"; + goto done; + } + SDL_memset( ptr, color, count ); + } + else + { + ++count; + + if ( ( count > remainingbytes ) || !SDL_RWread( src, ptr, count, 1 ) ) + { + error="error reading BODY chunk"; + goto done; + } + } + + ptr += count; + remainingbytes -= count; + + } while ( remainingbytes > 0 ); + } + else + { + if ( !SDL_RWread( src, ptr, bytesperline, 1 ) ) + { + error="error reading BODY chunk"; + goto done; + } + } + } + + /* One line has been read, store it ! */ + + ptr = (Uint8 *)Image->pixels; + if ( nbplanes==24 || flagHAM==1 ) + ptr += h * width * 3; + else + ptr += h * width; + + if ( pbm ) /* File format : 'Packed Bitmap' */ + { + SDL_memcpy( ptr, MiniBuf, width ); + } + else /* We have to un-interlace the bits ! */ + { + if ( nbplanes!=24 && flagHAM==0 ) + { + size = ( width + 7 ) / 8; + + for ( i=0; i < size; i++ ) + { + memset( ptr, 0, 8 ); + + for ( plane=0; plane < (nbplanes + stencil); plane++ ) + { + color = *( MiniBuf + i + ( plane * bytesperline ) ); + msk = 0x80; + + for ( j=0; j<8; j++ ) + { + if ( ( plane + j ) <= 7 ) ptr[j] |= (Uint8)( color & msk ) >> ( 7 - plane - j ); + else ptr[j] |= (Uint8)( color & msk ) << ( plane + j - 7 ); + + msk >>= 1; + } + } + ptr += 8; + } + } + else + { + Uint32 finalcolor = 0; + size = ( width + 7 ) / 8; + /* 24 bitplanes ILBM : R0...R7,G0...G7,B0...B7 */ + /* or HAM (6 bitplanes) or HAM8 (8 bitplanes) modes */ + for ( i=0; i>(nbplanes-2) ) + { + case 0: /* take direct color from palette */ + finalcolor = colormap[ pixelcolor*3 ] + (colormap[ pixelcolor*3+1 ]<<8) + (colormap[ pixelcolor*3+2 ]<<16); + break; + case 1: /* modify only blue component */ + finalcolor = finalcolor&0x00FFFF; + finalcolor = finalcolor | (pixelcolor<<(16+(10-nbplanes))); + break; + case 2: /* modify only red component */ + finalcolor = finalcolor&0xFFFF00; + finalcolor = finalcolor | pixelcolor<<(10-nbplanes); + break; + case 3: /* modify only green component */ + finalcolor = finalcolor&0xFF00FF; + finalcolor = finalcolor | (pixelcolor<<(8+(10-nbplanes))); + break; + } + } + else + { + finalcolor = pixelcolor; + } +#if SDL_BYTEORDER == SDL_LIL_ENDIAN + *ptr++ = (Uint8)(finalcolor>>16); + *ptr++ = (Uint8)(finalcolor>>8); + *ptr++ = (Uint8)(finalcolor); +#else + *ptr++ = (Uint8)(finalcolor); + *ptr++ = (Uint8)(finalcolor>>8); + *ptr++ = (Uint8)(finalcolor>>16); +#endif + maskBit = maskBit>>1; + } + } + } + } + } + +done: + + if ( MiniBuf ) SDL_free( MiniBuf ); + + if ( error ) + { + SDL_RWseek(src, start, RW_SEEK_SET); + if ( Image ) { + SDL_FreeSurface( Image ); + Image = NULL; + } + IMG_SetError( error ); + } + + return( Image ); +} + +#else /* LOAD_LBM */ + +/* See if an image is contained in a data source */ +int IMG_isLBM(SDL_RWops *src) +{ + return(0); +} + +/* Load an IFF type image from an SDL datasource */ +SDL_Surface *IMG_LoadLBM_RW(SDL_RWops *src) +{ + return(NULL); +} + +#endif /* LOAD_LBM */ diff --git a/project/jni/sdl2_image/IMG_pcx.c b/project/jni/sdl2_image/IMG_pcx.c new file mode 100644 index 000000000..37c594772 --- /dev/null +++ b/project/jni/sdl2_image/IMG_pcx.c @@ -0,0 +1,276 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/* + * PCX file reader: + * Supports: + * 1..4 bits/pixel in multiplanar format (1 bit/plane/pixel) + * 8 bits/pixel in single-planar format (8 bits/plane/pixel) + * 24 bits/pixel in 3-plane format (8 bits/plane/pixel) + * + * (The <8bpp formats are expanded to 8bpp surfaces) + * + * Doesn't support: + * single-planar packed-pixel formats other than 8bpp + * 4-plane 32bpp format with a fourth "intensity" plane + */ +#include +#include + +#include "SDL_endian.h" + +#include "SDL_image.h" + +#ifdef LOAD_PCX + +struct PCXheader { + Uint8 Manufacturer; + Uint8 Version; + Uint8 Encoding; + Uint8 BitsPerPixel; + Sint16 Xmin, Ymin, Xmax, Ymax; + Sint16 HDpi, VDpi; + Uint8 Colormap[48]; + Uint8 Reserved; + Uint8 NPlanes; + Sint16 BytesPerLine; + Sint16 PaletteInfo; + Sint16 HscreenSize; + Sint16 VscreenSize; + Uint8 Filler[54]; +}; + +/* See if an image is contained in a data source */ +int IMG_isPCX(SDL_RWops *src) +{ + Sint64 start; + int is_PCX; + const int ZSoft_Manufacturer = 10; + const int PC_Paintbrush_Version = 5; + const int PCX_Uncompressed_Encoding = 0; + const int PCX_RunLength_Encoding = 1; + struct PCXheader pcxh; + + if ( !src ) + return 0; + start = SDL_RWtell(src); + is_PCX = 0; + if ( SDL_RWread(src, &pcxh, sizeof(pcxh), 1) == 1 ) { + if ( (pcxh.Manufacturer == ZSoft_Manufacturer) && + (pcxh.Version == PC_Paintbrush_Version) && + (pcxh.Encoding == PCX_RunLength_Encoding || + pcxh.Encoding == PCX_Uncompressed_Encoding) ) { + is_PCX = 1; + } + } + SDL_RWseek(src, start, RW_SEEK_SET); + return(is_PCX); +} + +/* Load a PCX type image from an SDL datasource */ +SDL_Surface *IMG_LoadPCX_RW(SDL_RWops *src) +{ + Sint64 start; + struct PCXheader pcxh; + Uint32 Rmask; + Uint32 Gmask; + Uint32 Bmask; + Uint32 Amask; + SDL_Surface *surface = NULL; + int width, height; + int y, bpl; + Uint8 *row, *buf = NULL; + char *error = NULL; + int bits, src_bits; + + if ( !src ) { + /* The error message has been set in SDL_RWFromFile */ + return NULL; + } + start = SDL_RWtell(src); + + if ( ! SDL_RWread(src, &pcxh, sizeof(pcxh), 1) ) { + error = "file truncated"; + goto done; + } + pcxh.Xmin = SDL_SwapLE16(pcxh.Xmin); + pcxh.Ymin = SDL_SwapLE16(pcxh.Ymin); + pcxh.Xmax = SDL_SwapLE16(pcxh.Xmax); + pcxh.Ymax = SDL_SwapLE16(pcxh.Ymax); + pcxh.BytesPerLine = SDL_SwapLE16(pcxh.BytesPerLine); + + /* Create the surface of the appropriate type */ + width = (pcxh.Xmax - pcxh.Xmin) + 1; + height = (pcxh.Ymax - pcxh.Ymin) + 1; + Rmask = Gmask = Bmask = Amask = 0; + src_bits = pcxh.BitsPerPixel * pcxh.NPlanes; + if((pcxh.BitsPerPixel == 1 && pcxh.NPlanes >= 1 && pcxh.NPlanes <= 4) + || (pcxh.BitsPerPixel == 8 && pcxh.NPlanes == 1)) { + bits = 8; + } else if(pcxh.BitsPerPixel == 8 && pcxh.NPlanes == 3) { + bits = 24; +#if SDL_BYTEORDER == SDL_LIL_ENDIAN + Rmask = 0x000000FF; + Gmask = 0x0000FF00; + Bmask = 0x00FF0000; +#else + Rmask = 0xFF0000; + Gmask = 0x00FF00; + Bmask = 0x0000FF; +#endif + } else { + error = "unsupported PCX format"; + goto done; + } + surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, + bits, Rmask, Gmask, Bmask, Amask); + if ( surface == NULL ) + goto done; + + bpl = pcxh.NPlanes * pcxh.BytesPerLine; + if (bpl > surface->pitch) { + error = "bytes per line is too large (corrupt?)"; + } + buf = (Uint8 *)SDL_malloc(bpl); + row = (Uint8 *)surface->pixels; + for ( y=0; yh; ++y ) { + /* decode a scan line to a temporary buffer first */ + int i, count = 0; + Uint8 ch; + Uint8 *dst = (src_bits == 8) ? row : buf; + if ( pcxh.Encoding == 0 ) { + if(!SDL_RWread(src, dst, bpl, 1)) { + error = "file truncated"; + goto done; + } + } else { + for(i = 0; i < bpl; i++) { + if(!count) { + if(!SDL_RWread(src, &ch, 1, 1)) { + error = "file truncated"; + goto done; + } + if( (ch & 0xc0) == 0xc0) { + count = ch & 0x3f; + if(!SDL_RWread(src, &ch, 1, 1)) { + error = "file truncated"; + goto done; + } + } else + count = 1; + } + dst[i] = ch; + count--; + } + } + + if(src_bits <= 4) { + /* expand planes to 1 byte/pixel */ + Uint8 *innerSrc = buf; + int plane; + for(plane = 0; plane < pcxh.NPlanes; plane++) { + int j, k, x = 0; + for(j = 0; j < pcxh.BytesPerLine; j++) { + Uint8 byte = *innerSrc++; + for(k = 7; k >= 0; k--) { + unsigned bit = (byte >> k) & 1; + /* skip padding bits */ + if (j * 8 + k >= width) + continue; + row[x++] |= bit << plane; + } + } + } + } else if(src_bits == 24) { + /* de-interlace planes */ + Uint8 *innerSrc = buf; + int plane; + for(plane = 0; plane < pcxh.NPlanes; plane++) { + int x; + dst = row + plane; + for(x = 0; x < width; x++) { + *dst = *innerSrc++; + dst += pcxh.NPlanes; + } + } + } + + row += surface->pitch; + } + + if(bits == 8) { + SDL_Color *colors = surface->format->palette->colors; + int nc = 1 << src_bits; + int i; + + surface->format->palette->ncolors = nc; + if(src_bits == 8) { + Uint8 ch; + /* look for a 256-colour palette */ + do { + if ( !SDL_RWread(src, &ch, 1, 1)) { + error = "file truncated"; + goto done; + } + } while ( ch != 12 ); + + for(i = 0; i < 256; i++) { + SDL_RWread(src, &colors[i].r, 1, 1); + SDL_RWread(src, &colors[i].g, 1, 1); + SDL_RWread(src, &colors[i].b, 1, 1); + } + } else { + for(i = 0; i < nc; i++) { + colors[i].r = pcxh.Colormap[i * 3]; + colors[i].g = pcxh.Colormap[i * 3 + 1]; + colors[i].b = pcxh.Colormap[i * 3 + 2]; + } + } + } + +done: + SDL_free(buf); + if ( error ) { + SDL_RWseek(src, start, RW_SEEK_SET); + if ( surface ) { + SDL_FreeSurface(surface); + surface = NULL; + } + IMG_SetError(error); + } + return(surface); +} + +#else + +/* See if an image is contained in a data source */ +int IMG_isPCX(SDL_RWops *src) +{ + return(0); +} + +/* Load a PCX type image from an SDL datasource */ +SDL_Surface *IMG_LoadPCX_RW(SDL_RWops *src) +{ + return(NULL); +} + +#endif /* LOAD_PCX */ diff --git a/project/jni/sdl2_image/IMG_png.c b/project/jni/sdl2_image/IMG_png.c new file mode 100644 index 000000000..e5b186d76 --- /dev/null +++ b/project/jni/sdl2_image/IMG_png.c @@ -0,0 +1,646 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/* This is a PNG image file loading framework */ + +#include "SDL_image.h" + +#if !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) + +#ifdef LOAD_PNG + +/*============================================================================= + File: SDL_png.c + Purpose: A PNG loader and saver for the SDL library + Revision: + Created by: Philippe Lavoie (2 November 1998) + lavoie@zeus.genie.uottawa.ca + Modified by: + + Copyright notice: + Copyright (C) 1998 Philippe Lavoie + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public + License as published by the Free Software Foundation; either + version 2 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with this library; if not, write to the Free + Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + Comments: The load and save routine are basically the ones you can find + in the example.c file from the libpng distribution. + + Changes: + 5/17/99 - Modified to use the new SDL data sources - Sam Lantinga + +=============================================================================*/ + +#include "SDL_endian.h" + +#ifdef macintosh +#define MACOS +#endif +#include + +/* Check for the older version of libpng */ +#if (PNG_LIBPNG_VER_MAJOR == 1) +#if (PNG_LIBPNG_VER_MINOR < 4) +#define LIBPNG_VERSION_12 +typedef png_bytep png_const_bytep; +#endif +#if (PNG_LIBPNG_VER_MINOR < 6) +typedef png_structp png_const_structrp; +typedef png_infop png_const_inforp; +#endif +#endif + +static struct { + int loaded; + void *handle; + png_infop (*png_create_info_struct) (png_const_structrp png_ptr); + png_structp (*png_create_read_struct) (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn); + void (*png_destroy_read_struct) (png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr); + png_uint_32 (*png_get_IHDR) (png_const_structrp png_ptr, png_const_inforp info_ptr, png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type, int *interlace_method, int *compression_method, int *filter_method); + png_voidp (*png_get_io_ptr) (png_const_structrp png_ptr); + png_byte (*png_get_channels) (png_const_structrp png_ptr, png_const_inforp info_ptr); + png_uint_32 (*png_get_PLTE) (png_const_structrp png_ptr, png_infop info_ptr, png_colorp *palette, int *num_palette); + png_uint_32 (*png_get_tRNS) (png_const_structrp png_ptr, png_infop info_ptr, png_bytep *trans, int *num_trans, png_color_16p *trans_values); + png_uint_32 (*png_get_valid) (png_const_structrp png_ptr, png_const_inforp info_ptr, png_uint_32 flag); + void (*png_read_image) (png_structp png_ptr, png_bytepp image); + void (*png_read_info) (png_structp png_ptr, png_infop info_ptr); + void (*png_read_update_info) (png_structp png_ptr, png_infop info_ptr); + void (*png_set_expand) (png_structp png_ptr); + void (*png_set_gray_to_rgb) (png_structp png_ptr); + void (*png_set_packing) (png_structp png_ptr); + void (*png_set_read_fn) (png_structp png_ptr, png_voidp io_ptr, png_rw_ptr read_data_fn); + void (*png_set_strip_16) (png_structp png_ptr); + int (*png_sig_cmp) (png_const_bytep sig, png_size_t start, png_size_t num_to_check); +#ifndef LIBPNG_VERSION_12 + jmp_buf* (*png_set_longjmp_fn) (png_structp, png_longjmp_ptr, size_t); +#endif +} lib; + +#ifdef LOAD_PNG_DYNAMIC +int IMG_InitPNG() +{ + if ( lib.loaded == 0 ) { + lib.handle = SDL_LoadObject(LOAD_PNG_DYNAMIC); + if ( lib.handle == NULL ) { + return -1; + } + lib.png_create_info_struct = + (png_infop (*) (png_const_structrp)) + SDL_LoadFunction(lib.handle, "png_create_info_struct"); + if ( lib.png_create_info_struct == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_create_read_struct = + (png_structp (*) (png_const_charp, png_voidp, png_error_ptr, png_error_ptr)) + SDL_LoadFunction(lib.handle, "png_create_read_struct"); + if ( lib.png_create_read_struct == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_destroy_read_struct = + (void (*) (png_structpp, png_infopp, png_infopp)) + SDL_LoadFunction(lib.handle, "png_destroy_read_struct"); + if ( lib.png_destroy_read_struct == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_get_IHDR = + (png_uint_32 (*) (png_const_structrp, png_const_inforp, png_uint_32 *, png_uint_32 *, int *, int *, int *, int *, int *)) + SDL_LoadFunction(lib.handle, "png_get_IHDR"); + if ( lib.png_get_IHDR == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_get_channels = + (png_byte (*) (png_const_structrp, png_const_inforp)) + SDL_LoadFunction(lib.handle, "png_get_channels"); + if ( lib.png_get_channels == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_get_io_ptr = + (png_voidp (*) (png_const_structrp)) + SDL_LoadFunction(lib.handle, "png_get_io_ptr"); + if ( lib.png_get_io_ptr == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_get_PLTE = + (png_uint_32 (*) (png_const_structrp, png_infop, png_colorp *, int *)) + SDL_LoadFunction(lib.handle, "png_get_PLTE"); + if ( lib.png_get_PLTE == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_get_tRNS = + (png_uint_32 (*) (png_const_structrp, png_infop, png_bytep *, int *, png_color_16p *)) + SDL_LoadFunction(lib.handle, "png_get_tRNS"); + if ( lib.png_get_tRNS == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_get_valid = + (png_uint_32 (*) (png_const_structrp, png_const_inforp, png_uint_32)) + SDL_LoadFunction(lib.handle, "png_get_valid"); + if ( lib.png_get_valid == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_read_image = + (void (*) (png_structp, png_bytepp)) + SDL_LoadFunction(lib.handle, "png_read_image"); + if ( lib.png_read_image == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_read_info = + (void (*) (png_structp, png_infop)) + SDL_LoadFunction(lib.handle, "png_read_info"); + if ( lib.png_read_info == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_read_update_info = + (void (*) (png_structp, png_infop)) + SDL_LoadFunction(lib.handle, "png_read_update_info"); + if ( lib.png_read_update_info == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_set_expand = + (void (*) (png_structp)) + SDL_LoadFunction(lib.handle, "png_set_expand"); + if ( lib.png_set_expand == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_set_gray_to_rgb = + (void (*) (png_structp)) + SDL_LoadFunction(lib.handle, "png_set_gray_to_rgb"); + if ( lib.png_set_gray_to_rgb == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_set_packing = + (void (*) (png_structp)) + SDL_LoadFunction(lib.handle, "png_set_packing"); + if ( lib.png_set_packing == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_set_read_fn = + (void (*) (png_structp, png_voidp, png_rw_ptr)) + SDL_LoadFunction(lib.handle, "png_set_read_fn"); + if ( lib.png_set_read_fn == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_set_strip_16 = + (void (*) (png_structp)) + SDL_LoadFunction(lib.handle, "png_set_strip_16"); + if ( lib.png_set_strip_16 == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.png_sig_cmp = + (int (*) (png_const_bytep, png_size_t, png_size_t)) + SDL_LoadFunction(lib.handle, "png_sig_cmp"); + if ( lib.png_sig_cmp == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } +#ifndef LIBPNG_VERSION_12 + lib.png_set_longjmp_fn = + (jmp_buf * (*) (png_structp, png_longjmp_ptr, size_t)) + SDL_LoadFunction(lib.handle, "png_set_longjmp_fn"); + if ( lib.png_set_longjmp_fn == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } +#endif + } + ++lib.loaded; + + return 0; +} +void IMG_QuitPNG() +{ + if ( lib.loaded == 0 ) { + return; + } + if ( lib.loaded == 1 ) { + SDL_UnloadObject(lib.handle); + } + --lib.loaded; +} +#else +int IMG_InitPNG() +{ + if ( lib.loaded == 0 ) { + lib.png_create_info_struct = png_create_info_struct; + lib.png_create_read_struct = png_create_read_struct; + lib.png_destroy_read_struct = png_destroy_read_struct; + lib.png_get_IHDR = png_get_IHDR; + lib.png_get_channels = png_get_channels; + lib.png_get_io_ptr = png_get_io_ptr; + lib.png_get_PLTE = png_get_PLTE; + lib.png_get_tRNS = png_get_tRNS; + lib.png_get_valid = png_get_valid; + lib.png_read_image = png_read_image; + lib.png_read_info = png_read_info; + lib.png_read_update_info = png_read_update_info; + lib.png_set_expand = png_set_expand; + lib.png_set_gray_to_rgb = png_set_gray_to_rgb; + lib.png_set_packing = png_set_packing; + lib.png_set_read_fn = png_set_read_fn; + lib.png_set_strip_16 = png_set_strip_16; + lib.png_sig_cmp = png_sig_cmp; +#ifndef LIBPNG_VERSION_12 + lib.png_set_longjmp_fn = png_set_longjmp_fn; +#endif + } + ++lib.loaded; + + return 0; +} +void IMG_QuitPNG() +{ + if ( lib.loaded == 0 ) { + return; + } + if ( lib.loaded == 1 ) { + } + --lib.loaded; +} +#endif /* LOAD_PNG_DYNAMIC */ + +/* See if an image is contained in a data source */ +int IMG_isPNG(SDL_RWops *src) +{ + Sint64 start; + int is_PNG; + Uint8 magic[4]; + + if ( !src ) { + return 0; + } + + start = SDL_RWtell(src); + is_PNG = 0; + if ( SDL_RWread(src, magic, 1, sizeof(magic)) == sizeof(magic) ) { + if ( magic[0] == 0x89 && + magic[1] == 'P' && + magic[2] == 'N' && + magic[3] == 'G' ) { + is_PNG = 1; + } + } + SDL_RWseek(src, start, RW_SEEK_SET); + return(is_PNG); +} + +/* Load a PNG type image from an SDL datasource */ +static void png_read_data(png_structp ctx, png_bytep area, png_size_t size) +{ + SDL_RWops *src; + + src = (SDL_RWops *)lib.png_get_io_ptr(ctx); + SDL_RWread(src, area, size, 1); +} +SDL_Surface *IMG_LoadPNG_RW(SDL_RWops *src) +{ + Sint64 start; + const char *error; + SDL_Surface *volatile surface; + png_structp png_ptr; + png_infop info_ptr; + png_uint_32 width, height; + int bit_depth, color_type, interlace_type, num_channels; + Uint32 Rmask; + Uint32 Gmask; + Uint32 Bmask; + Uint32 Amask; + SDL_Palette *palette; + png_bytep *volatile row_pointers; + int row, i; + int ckey = -1; + png_color_16 *transv; + + if ( !src ) { + /* The error message has been set in SDL_RWFromFile */ + return NULL; + } + start = SDL_RWtell(src); + + if ( !IMG_Init(IMG_INIT_PNG) ) { + return NULL; + } + + /* Initialize the data we will clean up when we're done */ + error = NULL; + png_ptr = NULL; info_ptr = NULL; row_pointers = NULL; surface = NULL; + + /* Create the PNG loading context structure */ + png_ptr = lib.png_create_read_struct(PNG_LIBPNG_VER_STRING, + NULL,NULL,NULL); + if (png_ptr == NULL){ + error = "Couldn't allocate memory for PNG file or incompatible PNG dll"; + goto done; + } + + /* Allocate/initialize the memory for image information. REQUIRED. */ + info_ptr = lib.png_create_info_struct(png_ptr); + if (info_ptr == NULL) { + error = "Couldn't create image information for PNG file"; + goto done; + } + + /* Set error handling if you are using setjmp/longjmp method (this is + * the normal method of doing things with libpng). REQUIRED unless you + * set up your own error handlers in png_create_read_struct() earlier. + */ +#ifndef LIBPNG_VERSION_12 + if ( setjmp(*lib.png_set_longjmp_fn(png_ptr, longjmp, sizeof (jmp_buf))) ) +#else + if ( setjmp(png_ptr->jmpbuf) ) +#endif + { + error = "Error reading the PNG file."; + goto done; + } + + /* Set up the input control */ + lib.png_set_read_fn(png_ptr, src, png_read_data); + + /* Read PNG header info */ + lib.png_read_info(png_ptr, info_ptr); + lib.png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, + &color_type, &interlace_type, NULL, NULL); + + /* tell libpng to strip 16 bit/color files down to 8 bits/color */ + lib.png_set_strip_16(png_ptr) ; + + /* Extract multiple pixels with bit depths of 1, 2, and 4 from a single + * byte into separate bytes (useful for paletted and grayscale images). + */ + lib.png_set_packing(png_ptr); + + /* scale greyscale values to the range 0..255 */ + if (color_type == PNG_COLOR_TYPE_GRAY) + lib.png_set_expand(png_ptr); + + /* For images with a single "transparent colour", set colour key; + if more than one index has transparency, or if partially transparent + entries exist, use full alpha channel */ + if (lib.png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) { + int num_trans; + Uint8 *trans; + lib.png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans, &transv); + if (color_type == PNG_COLOR_TYPE_PALETTE) { + /* Check if all tRNS entries are opaque except one */ + int j, t = -1; + for (j = 0; j < num_trans; j++) { + if (trans[j] == 0) { + if (t >= 0) { + break; + } + t = j; + } else if (trans[j] != 255) { + break; + } + } + if (j == num_trans) { + /* exactly one transparent index */ + ckey = t; + } else { + /* more than one transparent index, or translucency */ + lib.png_set_expand(png_ptr); + } + } else { + ckey = 0; /* actual value will be set later */ + } + } + + if ( color_type == PNG_COLOR_TYPE_GRAY_ALPHA ) + lib.png_set_gray_to_rgb(png_ptr); + + lib.png_read_update_info(png_ptr, info_ptr); + + lib.png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, + &color_type, &interlace_type, NULL, NULL); + + /* Allocate the SDL surface to hold the image */ + Rmask = Gmask = Bmask = Amask = 0 ; + num_channels = lib.png_get_channels(png_ptr, info_ptr); + if ( num_channels >= 3 ) { +#if SDL_BYTEORDER == SDL_LIL_ENDIAN + Rmask = 0x000000FF; + Gmask = 0x0000FF00; + Bmask = 0x00FF0000; + Amask = (num_channels == 4) ? 0xFF000000 : 0; +#else + int s = (num_channels == 4) ? 0 : 8; + Rmask = 0xFF000000 >> s; + Gmask = 0x00FF0000 >> s; + Bmask = 0x0000FF00 >> s; + Amask = 0x000000FF >> s; +#endif + } + surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, + bit_depth*num_channels, Rmask,Gmask,Bmask,Amask); + if ( surface == NULL ) { + error = SDL_GetError(); + goto done; + } + + if (ckey != -1) { + if (color_type != PNG_COLOR_TYPE_PALETTE) { + /* FIXME: Should these be truncated or shifted down? */ + ckey = SDL_MapRGB(surface->format, + (Uint8)transv->red, + (Uint8)transv->green, + (Uint8)transv->blue); + } + SDL_SetColorKey(surface, SDL_TRUE, ckey); + } + + /* Create the array of pointers to image data */ + row_pointers = (png_bytep*) SDL_malloc(sizeof(png_bytep)*height); + if ( (row_pointers == NULL) ) { + error = "Out of memory"; + goto done; + } + for (row = 0; row < (int)height; row++) { + row_pointers[row] = (png_bytep) + (Uint8 *)surface->pixels + row*surface->pitch; + } + + /* Read the entire image in one go */ + lib.png_read_image(png_ptr, row_pointers); + + /* and we're done! (png_read_end() can be omitted if no processing of + * post-IDAT text/time/etc. is desired) + * In some cases it can't read PNG's created by some popular programs (ACDSEE), + * we do not want to process comments, so we omit png_read_end + + lib.png_read_end(png_ptr, info_ptr); + */ + + /* Load the palette, if any */ + palette = surface->format->palette; + if ( palette ) { + int png_num_palette; + png_colorp png_palette; + lib.png_get_PLTE(png_ptr, info_ptr, &png_palette, &png_num_palette); + if (color_type == PNG_COLOR_TYPE_GRAY) { + palette->ncolors = 256; + for (i = 0; i < 256; i++) { + palette->colors[i].r = i; + palette->colors[i].g = i; + palette->colors[i].b = i; + } + } else if (png_num_palette > 0 ) { + palette->ncolors = png_num_palette; + for ( i=0; icolors[i].b = png_palette[i].blue; + palette->colors[i].g = png_palette[i].green; + palette->colors[i].r = png_palette[i].red; + } + } + } + +done: /* Clean up and return */ + if ( png_ptr ) { + lib.png_destroy_read_struct(&png_ptr, + info_ptr ? &info_ptr : (png_infopp)0, + (png_infopp)0); + } + if ( row_pointers ) { + SDL_free(row_pointers); + } + if ( error ) { + SDL_RWseek(src, start, RW_SEEK_SET); + if ( surface ) { + SDL_FreeSurface(surface); + surface = NULL; + } + IMG_SetError(error); + } + return(surface); +} + +#else + +int IMG_InitPNG() +{ + IMG_SetError("PNG images are not supported"); + return(-1); +} + +void IMG_QuitPNG() +{ +} + +/* See if an image is contained in a data source */ +int IMG_isPNG(SDL_RWops *src) +{ + return(0); +} + +/* Load a PNG type image from an SDL datasource */ +SDL_Surface *IMG_LoadPNG_RW(SDL_RWops *src) +{ + return(NULL); +} + +#endif /* LOAD_PNG */ + +#endif /* !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) */ + +/* We'll always have PNG save support */ +#define SAVE_PNG + +#ifdef SAVE_PNG + +#include "miniz.h" + +int IMG_SavePNG(SDL_Surface *surface, const char *file) +{ + SDL_RWops *dst = SDL_RWFromFile(file, "wb"); + if (dst) { + return IMG_SavePNG_RW(surface, dst, 1); + } else { + return -1; + } +} + +int IMG_SavePNG_RW(SDL_Surface *surface, SDL_RWops *dst, int freedst) +{ + int result = -1; + + if (dst) { +#if SDL_BYTEORDER == SDL_LIL_ENDIAN + static const Uint32 png_format = SDL_PIXELFORMAT_ABGR8888; +#else + static const Uint32 png_format = SDL_PIXELFORMAT_RGBA8888; +#endif + size_t size; + void *png; + + if (surface->format->format == png_format) { + png = tdefl_write_image_to_png_file_in_memory(surface->pixels, surface->w, surface->h, surface->pitch, surface->format->BytesPerPixel, &size); + } else { + SDL_Surface *cvt = SDL_ConvertSurfaceFormat(surface, png_format, 0); + if (cvt) { + png = tdefl_write_image_to_png_file_in_memory(cvt->pixels, cvt->w, cvt->h, cvt->pitch, cvt->format->BytesPerPixel, &size); + SDL_FreeSurface(cvt); + } + } + if (png) { + if (SDL_RWwrite(dst, png, size, 1)) { + result = 0; + } + SDL_free(png); + } else { + SDL_SetError("Failed to convert and save image"); + } + if (freedst) { + SDL_RWclose(dst); + } + } else { + SDL_SetError("Passed NULL dst"); + } + return result; +} + +#endif /* SAVE_PNG */ diff --git a/project/jni/sdl2_image/IMG_pnm.c b/project/jni/sdl2_image/IMG_pnm.c new file mode 100644 index 000000000..478caf63b --- /dev/null +++ b/project/jni/sdl2_image/IMG_pnm.c @@ -0,0 +1,258 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/* + * PNM (portable anymap) image loader: + * + * Supports: PBM, PGM and PPM, ASCII and binary formats + * (PBM and PGM are loaded as 8bpp surfaces) + * Does not support: maximum component value > 255 + */ + +#include +#include +#include +#include + +#include "SDL_image.h" + +#ifdef LOAD_PNM + +/* See if an image is contained in a data source */ +int IMG_isPNM(SDL_RWops *src) +{ + Sint64 start; + int is_PNM; + char magic[2]; + + if ( !src ) + return 0; + start = SDL_RWtell(src); + is_PNM = 0; + if ( SDL_RWread(src, magic, sizeof(magic), 1) ) { + /* + * PNM magic signatures: + * P1 PBM, ascii format + * P2 PGM, ascii format + * P3 PPM, ascii format + * P4 PBM, binary format + * P5 PGM, binary format + * P6 PPM, binary format + * P7 PAM, a general wrapper for PNM data + */ + if ( magic[0] == 'P' && magic[1] >= '1' && magic[1] <= '6' ) { + is_PNM = 1; + } + } + SDL_RWseek(src, start, RW_SEEK_SET); + return(is_PNM); +} + +/* read a non-negative integer from the source. return -1 upon error */ +static int ReadNumber(SDL_RWops *src) +{ + int number; + unsigned char ch; + + /* Initialize return value */ + number = 0; + + /* Skip leading whitespace */ + do { + if ( ! SDL_RWread(src, &ch, 1, 1) ) { + return(0); + } + /* Eat comments as whitespace */ + if ( ch == '#' ) { /* Comment is '#' to end of line */ + do { + if ( ! SDL_RWread(src, &ch, 1, 1) ) { + return -1; + } + } while ( (ch != '\r') && (ch != '\n') ); + } + } while ( isspace(ch) ); + + /* Add up the number */ + do { + number *= 10; + number += ch-'0'; + + if ( !SDL_RWread(src, &ch, 1, 1) ) { + return -1; + } + } while ( isdigit(ch) ); + + return(number); +} + +SDL_Surface *IMG_LoadPNM_RW(SDL_RWops *src) +{ + Sint64 start; + SDL_Surface *surface = NULL; + int width, height; + int maxval, y, bpl; + Uint8 *row; + Uint8 *buf = NULL; + char *error = NULL; + Uint8 magic[2]; + int ascii; + enum { PBM, PGM, PPM, PAM } kind; + +#define ERROR(s) do { error = (s); goto done; } while(0) + + if ( !src ) { + /* The error message has been set in SDL_RWFromFile */ + return NULL; + } + start = SDL_RWtell(src); + + SDL_RWread(src, magic, 2, 1); + kind = magic[1] - '1'; + ascii = 1; + if(kind >= 3) { + ascii = 0; + kind -= 3; + } + + width = ReadNumber(src); + height = ReadNumber(src); + if(width <= 0 || height <= 0) + ERROR("Unable to read image width and height"); + + if(kind != PBM) { + maxval = ReadNumber(src); + if(maxval <= 0 || maxval > 255) + ERROR("unsupported PNM format"); + } else + maxval = 255; /* never scale PBMs */ + + /* binary PNM allows just a single character of whitespace after + the last parameter, and we've already consumed it */ + + if(kind == PPM) { + /* 24-bit surface in R,G,B byte order */ + surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 24, +#if SDL_BYTEORDER == SDL_LIL_ENDIAN + 0x000000ff, 0x0000ff00, 0x00ff0000, +#else + 0x00ff0000, 0x0000ff00, 0x000000ff, +#endif + 0); + } else { + /* load PBM/PGM as 8-bit indexed images */ + surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 8, + 0, 0, 0, 0); + } + if ( surface == NULL ) + ERROR("Out of memory"); + bpl = width * surface->format->BytesPerPixel; + if(kind == PGM) { + SDL_Color *c = surface->format->palette->colors; + int i; + for(i = 0; i < 256; i++) + c[i].r = c[i].g = c[i].b = i; + surface->format->palette->ncolors = 256; + } else if(kind == PBM) { + /* for some reason PBM has 1=black, 0=white */ + SDL_Color *c = surface->format->palette->colors; + c[0].r = c[0].g = c[0].b = 255; + c[1].r = c[1].g = c[1].b = 0; + surface->format->palette->ncolors = 2; + bpl = (width + 7) >> 3; + buf = (Uint8 *)SDL_malloc(bpl); + if(buf == NULL) + ERROR("Out of memory"); + } + + /* Read the image into the surface */ + row = (Uint8 *)surface->pixels; + for(y = 0; y < height; y++) { + if(ascii) { + int i; + if(kind == PBM) { + for(i = 0; i < width; i++) { + Uint8 ch; + do { + if(!SDL_RWread(src, &ch, + 1, 1)) + ERROR("file truncated"); + ch -= '0'; + } while(ch > 1); + row[i] = ch; + } + } else { + for(i = 0; i < bpl; i++) { + int c; + c = ReadNumber(src); + if(c < 0) + ERROR("file truncated"); + row[i] = c; + } + } + } else { + Uint8 *dst = (kind == PBM) ? buf : row; + if(!SDL_RWread(src, dst, bpl, 1)) + ERROR("file truncated"); + if(kind == PBM) { + /* expand bitmap to 8bpp */ + int i; + for(i = 0; i < width; i++) { + int bit = 7 - (i & 7); + row[i] = (buf[i >> 3] >> bit) & 1; + } + } + } + if(maxval < 255) { + /* scale up to full dynamic range (slow) */ + int i; + for(i = 0; i < bpl; i++) + row[i] = row[i] * 255 / maxval; + } + row += surface->pitch; + } +done: + SDL_free(buf); + if(error) { + SDL_RWseek(src, start, RW_SEEK_SET); + if ( surface ) { + SDL_FreeSurface(surface); + surface = NULL; + } + IMG_SetError(error); + } + return(surface); +} + +#else + +/* See if an image is contained in a data source */ +int IMG_isPNM(SDL_RWops *src) +{ + return(0); +} + +/* Load a PNM type image from an SDL datasource */ +SDL_Surface *IMG_LoadPNM_RW(SDL_RWops *src) +{ + return(NULL); +} + +#endif /* LOAD_PNM */ diff --git a/project/jni/sdl2_image/IMG_tga.c b/project/jni/sdl2_image/IMG_tga.c new file mode 100644 index 000000000..cbeae8a3d --- /dev/null +++ b/project/jni/sdl2_image/IMG_tga.c @@ -0,0 +1,340 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +#if !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) + +/* This is a Targa image file loading framework */ + +#include +#include +#include + +#include "SDL_endian.h" + +#include "SDL_image.h" + +#ifdef LOAD_TGA + +/* + * A TGA loader for the SDL library + * Supports: Reading 8, 15, 16, 24 and 32bpp images, with alpha or colourkey, + * uncompressed or RLE encoded. + * + * 2000-06-10 Mattias Engdegård : initial version + * 2000-06-26 Mattias Engdegård : read greyscale TGAs + * 2000-08-09 Mattias Engdegård : alpha inversion removed + */ + +struct TGAheader { + Uint8 infolen; /* length of info field */ + Uint8 has_cmap; /* 1 if image has colormap, 0 otherwise */ + Uint8 type; + + Uint8 cmap_start[2]; /* index of first colormap entry */ + Uint8 cmap_len[2]; /* number of entries in colormap */ + Uint8 cmap_bits; /* bits per colormap entry */ + + Uint8 yorigin[2]; /* image origin (ignored here) */ + Uint8 xorigin[2]; + Uint8 width[2]; /* image size */ + Uint8 height[2]; + Uint8 pixel_bits; /* bits/pixel */ + Uint8 flags; +}; + +enum tga_type { + TGA_TYPE_INDEXED = 1, + TGA_TYPE_RGB = 2, + TGA_TYPE_BW = 3, + TGA_TYPE_RLE_INDEXED = 9, + TGA_TYPE_RLE_RGB = 10, + TGA_TYPE_RLE_BW = 11 +}; + +#define TGA_INTERLEAVE_MASK 0xc0 +#define TGA_INTERLEAVE_NONE 0x00 +#define TGA_INTERLEAVE_2WAY 0x40 +#define TGA_INTERLEAVE_4WAY 0x80 + +#define TGA_ORIGIN_MASK 0x30 +#define TGA_ORIGIN_LEFT 0x00 +#define TGA_ORIGIN_RIGHT 0x10 +#define TGA_ORIGIN_LOWER 0x00 +#define TGA_ORIGIN_UPPER 0x20 + +/* read/write unaligned little-endian 16-bit ints */ +#define LE16(p) ((p)[0] + ((p)[1] << 8)) +#define SETLE16(p, v) ((p)[0] = (v), (p)[1] = (v) >> 8) + +/* Load a TGA type image from an SDL datasource */ +SDL_Surface *IMG_LoadTGA_RW(SDL_RWops *src) +{ + Sint64 start; + const char *error = NULL; + struct TGAheader hdr; + int rle = 0; + int alpha = 0; + int indexed = 0; + int grey = 0; + int ckey = -1; + int ncols, w, h; + SDL_Surface *img = NULL; + Uint32 rmask, gmask, bmask, amask; + Uint8 *dst; + int i; + int bpp; + int lstep; + Uint32 pixel; + int count, rep; + + if ( !src ) { + /* The error message has been set in SDL_RWFromFile */ + return NULL; + } + start = SDL_RWtell(src); + + if(!SDL_RWread(src, &hdr, sizeof(hdr), 1)) { + error = "Error reading TGA data"; + goto error; + } + ncols = LE16(hdr.cmap_len); + switch(hdr.type) { + case TGA_TYPE_RLE_INDEXED: + rle = 1; + /* fallthrough */ + case TGA_TYPE_INDEXED: + if(!hdr.has_cmap || hdr.pixel_bits != 8 || ncols > 256) + goto unsupported; + indexed = 1; + break; + + case TGA_TYPE_RLE_RGB: + rle = 1; + /* fallthrough */ + case TGA_TYPE_RGB: + indexed = 0; + break; + + case TGA_TYPE_RLE_BW: + rle = 1; + /* fallthrough */ + case TGA_TYPE_BW: + if(hdr.pixel_bits != 8) + goto unsupported; + /* Treat greyscale as 8bpp indexed images */ + indexed = grey = 1; + break; + + default: + goto unsupported; + } + + bpp = (hdr.pixel_bits + 7) >> 3; + rmask = gmask = bmask = amask = 0; + switch(hdr.pixel_bits) { + case 8: + if(!indexed) { + goto unsupported; + } + break; + + case 15: + case 16: + /* 15 and 16bpp both seem to use 5 bits/plane. The extra alpha bit + is ignored for now. */ + rmask = 0x7c00; + gmask = 0x03e0; + bmask = 0x001f; + break; + + case 32: + alpha = 1; + /* fallthrough */ + case 24: +#if SDL_BYTEORDER == SDL_BIG_ENDIAN + { + int s = alpha ? 0 : 8; + amask = 0x000000ff >> s; + rmask = 0x0000ff00 >> s; + gmask = 0x00ff0000 >> s; + bmask = 0xff000000 >> s; + } +#else + amask = alpha ? 0xff000000 : 0; + rmask = 0x00ff0000; + gmask = 0x0000ff00; + bmask = 0x000000ff; +#endif + break; + + default: + goto unsupported; + } + + if((hdr.flags & TGA_INTERLEAVE_MASK) != TGA_INTERLEAVE_NONE + || hdr.flags & TGA_ORIGIN_RIGHT) { + goto unsupported; + } + + SDL_RWseek(src, hdr.infolen, RW_SEEK_CUR); /* skip info field */ + + w = LE16(hdr.width); + h = LE16(hdr.height); + img = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, + bpp * 8, + rmask, gmask, bmask, amask); + if(img == NULL) { + error = "Out of memory"; + goto error; + } + + if(hdr.has_cmap) { + int palsiz = ncols * ((hdr.cmap_bits + 7) >> 3); + if(indexed && !grey) { + Uint8 *pal = (Uint8 *)SDL_malloc(palsiz), *p = pal; + SDL_Color *colors = img->format->palette->colors; + img->format->palette->ncolors = ncols; + SDL_RWread(src, pal, palsiz, 1); + for(i = 0; i < ncols; i++) { + switch(hdr.cmap_bits) { + case 15: + case 16: + { + Uint16 c = p[0] + (p[1] << 8); + p += 2; + colors[i].r = (c >> 7) & 0xf8; + colors[i].g = (c >> 2) & 0xf8; + colors[i].b = c << 3; + } + break; + case 24: + case 32: + colors[i].b = *p++; + colors[i].g = *p++; + colors[i].r = *p++; + if(hdr.cmap_bits == 32 && *p++ < 128) + ckey = i; + break; + } + } + SDL_free(pal); + if(ckey >= 0) + SDL_SetColorKey(img, SDL_TRUE, ckey); + } else { + /* skip unneeded colormap */ + SDL_RWseek(src, palsiz, RW_SEEK_CUR); + } + } + + if(grey) { + SDL_Color *colors = img->format->palette->colors; + for(i = 0; i < 256; i++) + colors[i].r = colors[i].g = colors[i].b = i; + img->format->palette->ncolors = 256; + } + + if(hdr.flags & TGA_ORIGIN_UPPER) { + lstep = img->pitch; + dst = (Uint8 *)img->pixels; + } else { + lstep = -img->pitch; + dst = (Uint8 *)img->pixels + (h - 1) * img->pitch; + } + + /* The RLE decoding code is slightly convoluted since we can't rely on + spans not to wrap across scan lines */ + count = rep = 0; + for(i = 0; i < h; i++) { + if(rle) { + int x = 0; + for(;;) { + Uint8 c; + + if(count) { + int n = count; + if(n > w - x) + n = w - x; + SDL_RWread(src, dst + x * bpp, n * bpp, 1); + count -= n; + x += n; + if(x == w) + break; + } else if(rep) { + int n = rep; + if(n > w - x) + n = w - x; + rep -= n; + while(n--) { + SDL_memcpy(dst + x * bpp, &pixel, bpp); + x++; + } + if(x == w) + break; + } + + SDL_RWread(src, &c, 1, 1); + if(c & 0x80) { + SDL_RWread(src, &pixel, bpp, 1); + rep = (c & 0x7f) + 1; + } else { + count = c + 1; + } + } + + } else { + SDL_RWread(src, dst, w * bpp, 1); + } +#if SDL_BYTEORDER == SDL_LIL_ENDIAN + if (bpp == 2) { + /* swap byte order */ + int x; + Uint16 *p = (Uint16 *)dst; + for(x = 0; x < w; x++) + p[x] = SDL_Swap16(p[x]); + } +#endif + dst += lstep; + } + return img; + +unsupported: + error = "Unsupported TGA format"; + +error: + SDL_RWseek(src, start, RW_SEEK_SET); + if ( img ) { + SDL_FreeSurface(img); + } + IMG_SetError(error); + return NULL; +} + +#else + +/* dummy TGA load routine */ +SDL_Surface *IMG_LoadTGA_RW(SDL_RWops *src) +{ + return(NULL); +} + +#endif /* LOAD_TGA */ + +#endif /* !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) */ diff --git a/project/jni/sdl2_image/IMG_tif.c b/project/jni/sdl2_image/IMG_tif.c new file mode 100644 index 000000000..651c454f3 --- /dev/null +++ b/project/jni/sdl2_image/IMG_tif.c @@ -0,0 +1,298 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +#if !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) + +/* This is a TIFF image file loading framework */ + +#include + +#include "SDL_image.h" + +#ifdef LOAD_TIF + +#include + +static struct { + int loaded; + void *handle; + TIFF* (*TIFFClientOpen)(const char*, const char*, thandle_t, TIFFReadWriteProc, TIFFReadWriteProc, TIFFSeekProc, TIFFCloseProc, TIFFSizeProc, TIFFMapFileProc, TIFFUnmapFileProc); + void (*TIFFClose)(TIFF*); + int (*TIFFGetField)(TIFF*, ttag_t, ...); + int (*TIFFReadRGBAImage)(TIFF*, uint32, uint32, uint32*, int); + TIFFErrorHandler (*TIFFSetErrorHandler)(TIFFErrorHandler); +} lib; + +#ifdef LOAD_TIF_DYNAMIC +int IMG_InitTIF() +{ + if ( lib.loaded == 0 ) { + lib.handle = SDL_LoadObject(LOAD_TIF_DYNAMIC); + if ( lib.handle == NULL ) { + return -1; + } + lib.TIFFClientOpen = + (TIFF* (*)(const char*, const char*, thandle_t, TIFFReadWriteProc, TIFFReadWriteProc, TIFFSeekProc, TIFFCloseProc, TIFFSizeProc, TIFFMapFileProc, TIFFUnmapFileProc)) + SDL_LoadFunction(lib.handle, "TIFFClientOpen"); + if ( lib.TIFFClientOpen == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.TIFFClose = + (void (*)(TIFF*)) + SDL_LoadFunction(lib.handle, "TIFFClose"); + if ( lib.TIFFClose == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.TIFFGetField = + (int (*)(TIFF*, ttag_t, ...)) + SDL_LoadFunction(lib.handle, "TIFFGetField"); + if ( lib.TIFFGetField == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.TIFFReadRGBAImage = + (int (*)(TIFF*, uint32, uint32, uint32*, int)) + SDL_LoadFunction(lib.handle, "TIFFReadRGBAImage"); + if ( lib.TIFFReadRGBAImage == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + lib.TIFFSetErrorHandler = + (TIFFErrorHandler (*)(TIFFErrorHandler)) + SDL_LoadFunction(lib.handle, "TIFFSetErrorHandler"); + if ( lib.TIFFSetErrorHandler == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + } + ++lib.loaded; + + return 0; +} +void IMG_QuitTIF() +{ + if ( lib.loaded == 0 ) { + return; + } + if ( lib.loaded == 1 ) { + SDL_UnloadObject(lib.handle); + } + --lib.loaded; +} +#else +int IMG_InitTIF() +{ + if ( lib.loaded == 0 ) { + lib.TIFFClientOpen = TIFFClientOpen; + lib.TIFFClose = TIFFClose; + lib.TIFFGetField = TIFFGetField; + lib.TIFFReadRGBAImage = TIFFReadRGBAImage; + lib.TIFFSetErrorHandler = TIFFSetErrorHandler; + } + ++lib.loaded; + + return 0; +} +void IMG_QuitTIF() +{ + if ( lib.loaded == 0 ) { + return; + } + if ( lib.loaded == 1 ) { + } + --lib.loaded; +} +#endif /* LOAD_TIF_DYNAMIC */ + +/* + * These are the thunking routine to use the SDL_RWops* routines from + * libtiff's internals. +*/ + +static tsize_t tiff_read(thandle_t fd, tdata_t buf, tsize_t size) +{ + return SDL_RWread((SDL_RWops*)fd, buf, 1, size); +} + +static toff_t tiff_seek(thandle_t fd, toff_t offset, int origin) +{ + return SDL_RWseek((SDL_RWops*)fd, offset, origin); +} + +static tsize_t tiff_write(thandle_t fd, tdata_t buf, tsize_t size) +{ + return SDL_RWwrite((SDL_RWops*)fd, buf, 1, size); +} + +static int tiff_close(thandle_t fd) +{ + /* + * We don't want libtiff closing our SDL_RWops*, but if it's not given + * a routine to try, and if the image isn't a TIFF, it'll segfault. + */ + return 0; +} + +static int tiff_map(thandle_t fd, tdata_t* pbase, toff_t* psize) +{ + return (0); +} + +static void tiff_unmap(thandle_t fd, tdata_t base, toff_t size) +{ + return; +} + +static toff_t tiff_size(thandle_t fd) +{ + Sint64 save_pos; + toff_t size; + + save_pos = SDL_RWtell((SDL_RWops*)fd); + SDL_RWseek((SDL_RWops*)fd, 0, RW_SEEK_END); + size = SDL_RWtell((SDL_RWops*)fd); + SDL_RWseek((SDL_RWops*)fd, save_pos, RW_SEEK_SET); + return size; +} + +int IMG_isTIF(SDL_RWops* src) +{ + Sint64 start; + int is_TIF; + Uint8 magic[4]; + + if ( !src ) + return 0; + start = SDL_RWtell(src); + is_TIF = 0; + if ( SDL_RWread(src, magic, 1, sizeof(magic)) == sizeof(magic) ) { + if ( (magic[0] == 'I' && + magic[1] == 'I' && + magic[2] == 0x2a && + magic[3] == 0x00) || + (magic[0] == 'M' && + magic[1] == 'M' && + magic[2] == 0x00 && + magic[3] == 0x2a) ) { + is_TIF = 1; + } + } + SDL_RWseek(src, start, RW_SEEK_SET); + return(is_TIF); +} + +SDL_Surface* IMG_LoadTIF_RW(SDL_RWops* src) +{ + Sint64 start; + TIFF* tiff; + SDL_Surface* surface = NULL; + Uint32 img_width, img_height; + Uint32 Rmask, Gmask, Bmask, Amask; + Uint32 x, y; + Uint32 half; + + if ( !src ) { + /* The error message has been set in SDL_RWFromFile */ + return NULL; + } + start = SDL_RWtell(src); + + if ( !IMG_Init(IMG_INIT_TIF) ) { + return NULL; + } + + /* turn off memory mapped access with the m flag */ + tiff = lib.TIFFClientOpen("SDL_image", "rm", (thandle_t)src, + tiff_read, tiff_write, tiff_seek, tiff_close, tiff_size, tiff_map, tiff_unmap); + if(!tiff) + goto error; + + /* Retrieve the dimensions of the image from the TIFF tags */ + lib.TIFFGetField(tiff, TIFFTAG_IMAGEWIDTH, &img_width); + lib.TIFFGetField(tiff, TIFFTAG_IMAGELENGTH, &img_height); + + Rmask = 0x000000FF; + Gmask = 0x0000FF00; + Bmask = 0x00FF0000; + Amask = 0xFF000000; + surface = SDL_CreateRGBSurface(SDL_SWSURFACE, img_width, img_height, 32, + Rmask, Gmask, Bmask, Amask); + if(!surface) + goto error; + + if(!lib.TIFFReadRGBAImage(tiff, img_width, img_height, (uint32 *)surface->pixels, 0)) + goto error; + + /* libtiff loads the image upside-down, flip it back */ + half = img_height / 2; + for(y = 0; y < half; y++) + { + Uint32 *top = (Uint32 *)surface->pixels + y * surface->pitch/4; + Uint32 *bot = (Uint32 *)surface->pixels + + (img_height - y - 1) * surface->pitch/4; + for(x = 0; x < img_width; x++) + { + Uint32 tmp = top[x]; + top[x] = bot[x]; + bot[x] = tmp; + } + } + lib.TIFFClose(tiff); + + return surface; + +error: + SDL_RWseek(src, start, RW_SEEK_SET); + if ( surface ) { + SDL_FreeSurface(surface); + } + return NULL; +} + +#else + +int IMG_InitTIF() +{ + IMG_SetError("TIFF images are not supported"); + return(-1); +} + +void IMG_QuitTIF() +{ +} + +/* See if an image is contained in a data source */ +int IMG_isTIF(SDL_RWops *src) +{ + return(0); +} + +/* Load a TIFF type image from an SDL datasource */ +SDL_Surface *IMG_LoadTIF_RW(SDL_RWops *src) +{ + return(NULL); +} + +#endif /* LOAD_TIF */ + +#endif /* !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) */ diff --git a/project/jni/sdl2_image/IMG_webp.c b/project/jni/sdl2_image/IMG_webp.c new file mode 100644 index 000000000..70c5e3b46 --- /dev/null +++ b/project/jni/sdl2_image/IMG_webp.c @@ -0,0 +1,317 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/* This is a WEBP image file loading framework */ + +#include +#include + +#include "SDL_image.h" + +#ifdef LOAD_WEBP + +/*============================================================================= + File: SDL_webp.c + Purpose: A WEBP loader for the SDL library + Revision: + Created by: Michael Bonfils (Murlock) (26 November 2011) + murlock42@gmail.com + +=============================================================================*/ + +#include "SDL_endian.h" + +#ifdef macintosh +#define MACOS +#endif +#include + +static struct { + int loaded; + void *handle; + VP8StatusCode (*webp_get_features_internal) (const uint8_t *data, size_t data_size, WebPBitstreamFeatures* features, int decoder_abi_version); + uint8_t* (*webp_decode_rgb_into) (const uint8_t* data, size_t data_size, uint8_t* output_buffer, size_t output_buffer_size, int output_stride); + uint8_t* (*webp_decode_rgba_into) (const uint8_t* data, size_t data_size, uint8_t* output_buffer, size_t output_buffer_size, int output_stride); +} lib; + +#ifdef LOAD_WEBP_DYNAMIC +int IMG_InitWEBP() +{ + if ( lib.loaded == 0 ) { + lib.handle = SDL_LoadObject(LOAD_WEBP_DYNAMIC); + if ( lib.handle == NULL ) { + return -1; + } + + lib.webp_get_features_internal = + ( VP8StatusCode (*) (const uint8_t *, size_t, WebPBitstreamFeatures*, int) ) + SDL_LoadFunction(lib.handle, "WebPGetFeaturesInternal" ); + if ( lib.webp_get_features_internal == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + + lib.webp_decode_rgb_into = + ( uint8_t* (*) (const uint8_t*, size_t, uint8_t*, size_t, int ) ) + SDL_LoadFunction(lib.handle, "WebPDecodeRGBInto" ); + if ( lib.webp_decode_rgb_into == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + + lib.webp_decode_rgba_into = + ( uint8_t* (*) (const uint8_t*, size_t, uint8_t*, size_t, int ) ) + SDL_LoadFunction(lib.handle, "WebPDecodeRGBAInto" ); + if ( lib.webp_decode_rgba_into == NULL ) { + SDL_UnloadObject(lib.handle); + return -1; + } + } + ++lib.loaded; + + return 0; +} +void IMG_QuitWEBP() +{ + if ( lib.loaded == 0 ) { + return; + } + if ( lib.loaded == 1 ) { + SDL_UnloadObject(lib.handle); + } + --lib.loaded; +} +#else +int IMG_InitWEBP() +{ + if ( lib.loaded == 0 ) { +#ifdef __MACOSX__ + extern VP8StatusCode WebPGetFeaturesInternal(const uint8_t*, size_t, WebPBitstreamFeatures*, int) __attribute__((weak_import)); + if ( WebPGetFeaturesInternal == NULL ) + { + /* Missing weakly linked framework */ + IMG_SetError("Missing webp.framework"); + return -1; + } +#endif // __MACOSX__ + + lib.webp_get_features_internal = WebPGetFeaturesInternal; + lib.webp_decode_rgb_into = WebPDecodeRGBInto; + lib.webp_decode_rgba_into = WebPDecodeRGBAInto; + } + ++lib.loaded; + + return 0; +} +void IMG_QuitWEBP() +{ + if ( lib.loaded == 0 ) { + return; + } + if ( lib.loaded == 1 ) { + } + --lib.loaded; +} +#endif /* LOAD_WEBP_DYNAMIC */ + +static int webp_getinfo( SDL_RWops *src, int *datasize ) { + Sint64 start; + int is_WEBP; + Uint8 magic[20]; + + if ( !src ) + return 0; + start = SDL_RWtell(src); + is_WEBP = 0; + if ( SDL_RWread(src, magic, 1, sizeof(magic)) == sizeof(magic) ) { + if ( magic[ 0] == 'R' && + magic[ 1] == 'I' && + magic[ 2] == 'F' && + magic[ 3] == 'F' && + magic[ 8] == 'W' && + magic[ 9] == 'E' && + magic[10] == 'B' && + magic[11] == 'P' && + magic[12] == 'V' && + magic[13] == 'P' && + magic[14] == '8' && +#if WEBP_DECODER_ABI_VERSION < 0x0003 /* old versions don't support WEBPVP8X and WEBPVP8L */ + magic[15] == ' ') { +#else + (magic[15] == ' ' || magic[15] == 'X' || magic[15] == 'L')) { +#endif + is_WEBP = 1; + if ( datasize ) { + *datasize = (int)SDL_RWseek(src, 0, SEEK_END); + } + } + } + SDL_RWseek(src, start, RW_SEEK_SET); + return(is_WEBP); +} + +/* See if an image is contained in a data source */ +int IMG_isWEBP(SDL_RWops *src) +{ + return webp_getinfo( src, NULL ); +} + +SDL_Surface *IMG_LoadWEBP_RW(SDL_RWops *src) +{ + Sint64 start; + const char *error = NULL; + SDL_Surface *volatile surface = NULL; + Uint32 Rmask; + Uint32 Gmask; + Uint32 Bmask; + Uint32 Amask; + WebPBitstreamFeatures features; + int raw_data_size; + uint8_t *raw_data = NULL; + int r; + uint8_t *ret; + + if ( !src ) { + /* The error message has been set in SDL_RWFromFile */ + return NULL; + } + + start = SDL_RWtell(src); + + if ( !IMG_Init(IMG_INIT_WEBP) ) { + goto error; + } + + raw_data_size = -1; + if ( !webp_getinfo( src, &raw_data_size ) ) { + error = "Invalid WEBP"; + goto error; + } + + // seek to start of file + SDL_RWseek(src, 0, RW_SEEK_SET ); + + raw_data = (uint8_t*) SDL_malloc( raw_data_size ); + if ( raw_data == NULL ) { + error = "Failed to allocate enought buffer for WEBP"; + goto error; + } + + r = SDL_RWread(src, raw_data, 1, raw_data_size ); + if ( r != raw_data_size ) { + error = "Failed to read WEBP"; + goto error; + } + +#if 0 + // extract size of picture, not interesting since we don't know about alpha channel + int width = -1, height = -1; + if ( !WebPGetInfo( raw_data, raw_data_size, &width, &height ) ) { + printf("WebPGetInfo has failed\n" ); + return NULL; + } +#endif + + if ( lib.webp_get_features_internal( raw_data, raw_data_size, &features, WEBP_DECODER_ABI_VERSION ) != VP8_STATUS_OK ) { + error = "WebPGetFeatures has failed"; + goto error; + } + + /* Check if it's ok !*/ +#if SDL_BYTEORDER == SDL_LIL_ENDIAN + Rmask = 0x000000FF; + Gmask = 0x0000FF00; + Bmask = 0x00FF0000; + Amask = (features.has_alpha) ? 0xFF000000 : 0; +#else + s = (features.has_alpha) ? 0 : 8; + Rmask = 0xFF000000 >> s; + Gmask = 0x00FF0000 >> s; + Bmask = 0x0000FF00 >> s; + Amask = 0x000000FF >> s; +#endif + + surface = SDL_CreateRGBSurface(SDL_SWSURFACE, + features.width, features.height, + features.has_alpha?32:24, Rmask,Gmask,Bmask,Amask); + + if ( surface == NULL ) { + error = "Failed to allocate SDL_Surface"; + goto error; + } + + if ( features.has_alpha ) { + ret = lib.webp_decode_rgba_into( raw_data, raw_data_size, (uint8_t *)surface->pixels, surface->pitch * surface->h, surface->pitch ); + } else { + ret = lib.webp_decode_rgb_into( raw_data, raw_data_size, (uint8_t *)surface->pixels, surface->pitch * surface->h, surface->pitch ); + } + + if ( !ret ) { + error = "Failed to decode WEBP"; + goto error; + } + + return surface; + + +error: + + if ( surface ) { + SDL_FreeSurface( surface ); + } + + if ( raw_data ) { + SDL_free( raw_data ); + } + + if ( error ) { + IMG_SetError( error ); + } + + SDL_RWseek(src, start, RW_SEEK_SET); + return(NULL); +} + +#else + +int IMG_InitWEBP() +{ + IMG_SetError("WEBP images are not supported"); + return(-1); +} + +void IMG_QuitWEBP() +{ +} + +/* See if an image is contained in a data source */ +int IMG_isWEBP(SDL_RWops *src) +{ + return(0); +} + +/* Load a WEBP type image from an SDL datasource */ +SDL_Surface *IMG_LoadWEBP_RW(SDL_RWops *src) +{ + return(NULL); +} + +#endif /* LOAD_WEBP */ diff --git a/project/jni/sdl2_image/IMG_xcf.c b/project/jni/sdl2_image/IMG_xcf.c new file mode 100644 index 000000000..5445d91da --- /dev/null +++ b/project/jni/sdl2_image/IMG_xcf.c @@ -0,0 +1,841 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/* This is a XCF image file loading framework */ + +#include +#include +#include +#include + +#include "SDL_endian.h" +#include "SDL_image.h" + +#ifdef LOAD_XCF + +#if DEBUG +static char prop_names [][30] = { + "end", + "colormap", + "active_layer", + "active_channel", + "selection", + "floating_selection", + "opacity", + "mode", + "visible", + "linked", + "preserve_transparency", + "apply_mask", + "edit_mask", + "show_mask", + "show_masked", + "offsets", + "color", + "compression", + "guides", + "resolution", + "tattoo", + "parasites", + "unit", + "paths", + "user_unit" +}; +#endif + + +typedef enum +{ + PROP_END = 0, + PROP_COLORMAP = 1, + PROP_ACTIVE_LAYER = 2, + PROP_ACTIVE_CHANNEL = 3, + PROP_SELECTION = 4, + PROP_FLOATING_SELECTION = 5, + PROP_OPACITY = 6, + PROP_MODE = 7, + PROP_VISIBLE = 8, + PROP_LINKED = 9, + PROP_PRESERVE_TRANSPARENCY = 10, + PROP_APPLY_MASK = 11, + PROP_EDIT_MASK = 12, + PROP_SHOW_MASK = 13, + PROP_SHOW_MASKED = 14, + PROP_OFFSETS = 15, + PROP_COLOR = 16, + PROP_COMPRESSION = 17, + PROP_GUIDES = 18, + PROP_RESOLUTION = 19, + PROP_TATTOO = 20, + PROP_PARASITES = 21, + PROP_UNIT = 22, + PROP_PATHS = 23, + PROP_USER_UNIT = 24 +} xcf_prop_type; + +typedef enum { + COMPR_NONE = 0, + COMPR_RLE = 1, + COMPR_ZLIB = 2, + COMPR_FRACTAL = 3 +} xcf_compr_type; + +typedef enum { + IMAGE_RGB = 0, + IMAGE_GREYSCALE = 1, + IMAGE_INDEXED = 2 +} xcf_image_type; + +typedef struct { + Uint32 id; + Uint32 length; + union { + struct { + Uint32 num; + char * cmap; + } colormap; // 1 + struct { + Uint32 drawable_offset; + } floating_selection; // 5 + Sint32 opacity; + Sint32 mode; + int visible; + int linked; + int preserve_transparency; + int apply_mask; + int show_mask; + struct { + Sint32 x; + Sint32 y; + } offset; + unsigned char color [3]; + Uint8 compression; + struct { + Sint32 x; + Sint32 y; + } resolution; + struct { + char * name; + Uint32 flags; + Uint32 size; + char * data; + } parasite; + } data; +} xcf_prop; + +typedef struct { + char sign [14]; + Uint32 width; + Uint32 height; + Sint32 image_type; + xcf_prop * properties; + + Uint32 * layer_file_offsets; + Uint32 * channel_file_offsets; + + xcf_compr_type compr; + Uint32 cm_num; + unsigned char * cm_map; +} xcf_header; + +typedef struct { + Uint32 width; + Uint32 height; + Sint32 layer_type; + char * name; + xcf_prop * properties; + + Uint32 hierarchy_file_offset; + Uint32 layer_mask_offset; + + Uint32 offset_x; + Uint32 offset_y; + int visible; +} xcf_layer; + +typedef struct { + Uint32 width; + Uint32 height; + char * name; + xcf_prop * properties; + + Uint32 hierarchy_file_offset; + + Uint32 color; + Uint32 opacity; + int selection; + int visible; +} xcf_channel; + +typedef struct { + Uint32 width; + Uint32 height; + Uint32 bpp; + + Uint32 * level_file_offsets; +} xcf_hierarchy; + +typedef struct { + Uint32 width; + Uint32 height; + + Uint32 * tile_file_offsets; +} xcf_level; + +typedef unsigned char * xcf_tile; + +typedef unsigned char * (* load_tile_type) (SDL_RWops *, Uint32, int, int, int); + + +/* See if an image is contained in a data source */ +int IMG_isXCF(SDL_RWops *src) +{ + Sint64 start; + int is_XCF; + char magic[14]; + + if ( !src ) + return 0; + start = SDL_RWtell(src); + is_XCF = 0; + if ( SDL_RWread(src, magic, sizeof(magic), 1) ) { + if (SDL_strncmp(magic, "gimp xcf ", 9) == 0) { + is_XCF = 1; + } + } + SDL_RWseek(src, start, RW_SEEK_SET); + return(is_XCF); +} + +static char * read_string (SDL_RWops * src) { + Uint32 tmp; + char * data; + + tmp = SDL_ReadBE32 (src); + if (tmp > 0) { + data = (char *) SDL_malloc (sizeof (char) * tmp); + SDL_RWread (src, data, tmp, 1); + } + else { + data = NULL; + } + + return data; +} + + +static Uint32 Swap32 (Uint32 v) { + return + ((v & 0x000000FF) << 16) + | ((v & 0x0000FF00)) + | ((v & 0x00FF0000) >> 16) + | ((v & 0xFF000000)); +} + +static void xcf_read_property (SDL_RWops * src, xcf_prop * prop) { + prop->id = SDL_ReadBE32 (src); + prop->length = SDL_ReadBE32 (src); + +#if DEBUG + printf ("%.8X: %s: %d\n", SDL_RWtell (src), prop->id < 25 ? prop_names [prop->id] : "unknown", prop->length); +#endif + + switch (prop->id) { + case PROP_COLORMAP: + prop->data.colormap.num = SDL_ReadBE32 (src); + prop->data.colormap.cmap = (char *) SDL_malloc (sizeof (char) * prop->data.colormap.num * 3); + SDL_RWread (src, prop->data.colormap.cmap, prop->data.colormap.num*3, 1); + break; + + case PROP_OFFSETS: + prop->data.offset.x = SDL_ReadBE32 (src); + prop->data.offset.y = SDL_ReadBE32 (src); + break; + case PROP_OPACITY: + prop->data.opacity = SDL_ReadBE32 (src); + break; + case PROP_COMPRESSION: + case PROP_COLOR: + SDL_RWread (src, &prop->data, prop->length, 1); + break; + case PROP_VISIBLE: + prop->data.visible = SDL_ReadBE32 (src); + break; + default: + // SDL_RWread (src, &prop->data, prop->length, 1); + SDL_RWseek (src, prop->length, RW_SEEK_CUR); + } +} + +static void free_xcf_header (xcf_header * h) { + if (h->cm_num) + SDL_free (h->cm_map); + if (h->layer_file_offsets) + SDL_free (h->layer_file_offsets); + SDL_free (h); +} + +static xcf_header * read_xcf_header (SDL_RWops * src) { + xcf_header * h; + xcf_prop prop; + + h = (xcf_header *) SDL_malloc (sizeof (xcf_header)); + SDL_RWread (src, h->sign, 14, 1); + h->width = SDL_ReadBE32 (src); + h->height = SDL_ReadBE32 (src); + h->image_type = SDL_ReadBE32 (src); + + h->properties = NULL; + h->layer_file_offsets = NULL; + h->compr = COMPR_NONE; + h->cm_num = 0; + h->cm_map = NULL; + + // Just read, don't save + do { + xcf_read_property (src, &prop); + if (prop.id == PROP_COMPRESSION) + h->compr = (xcf_compr_type)prop.data.compression; + else if (prop.id == PROP_COLORMAP) { + // unused var: int i; + + h->cm_num = prop.data.colormap.num; + h->cm_map = (unsigned char *) SDL_malloc (sizeof (unsigned char) * 3 * h->cm_num); + SDL_memcpy (h->cm_map, prop.data.colormap.cmap, 3*sizeof (char)*h->cm_num); + SDL_free (prop.data.colormap.cmap); + } + } while (prop.id != PROP_END); + + return h; +} + +static void free_xcf_layer (xcf_layer * l) { + SDL_free (l->name); + SDL_free (l); +} + +static xcf_layer * read_xcf_layer (SDL_RWops * src) { + xcf_layer * l; + xcf_prop prop; + + l = (xcf_layer *) SDL_malloc (sizeof (xcf_layer)); + l->width = SDL_ReadBE32 (src); + l->height = SDL_ReadBE32 (src); + l->layer_type = SDL_ReadBE32 (src); + + l->name = read_string (src); + + do { + xcf_read_property (src, &prop); + if (prop.id == PROP_OFFSETS) { + l->offset_x = prop.data.offset.x; + l->offset_y = prop.data.offset.y; + } else if (prop.id == PROP_VISIBLE) { + l->visible = prop.data.visible ? 1 : 0; + } + } while (prop.id != PROP_END); + + l->hierarchy_file_offset = SDL_ReadBE32 (src); + l->layer_mask_offset = SDL_ReadBE32 (src); + + return l; +} + +static void free_xcf_channel (xcf_channel * c) { + SDL_free (c->name); + SDL_free (c); +} + +static xcf_channel * read_xcf_channel (SDL_RWops * src) { + xcf_channel * l; + xcf_prop prop; + + l = (xcf_channel *) SDL_malloc (sizeof (xcf_channel)); + l->width = SDL_ReadBE32 (src); + l->height = SDL_ReadBE32 (src); + + l->name = read_string (src); + + l->selection = 0; + do { + xcf_read_property (src, &prop); + switch (prop.id) { + case PROP_OPACITY: + l->opacity = prop.data.opacity << 24; + break; + case PROP_COLOR: + l->color = ((Uint32) prop.data.color[0] << 16) + | ((Uint32) prop.data.color[1] << 8) + | ((Uint32) prop.data.color[2]); + break; + case PROP_SELECTION: + l->selection = 1; + break; + case PROP_VISIBLE: + l->visible = prop.data.visible ? 1 : 0; + break; + default: + ; + } + } while (prop.id != PROP_END); + + l->hierarchy_file_offset = SDL_ReadBE32 (src); + + return l; +} + +static void free_xcf_hierarchy (xcf_hierarchy * h) { + SDL_free (h->level_file_offsets); + SDL_free (h); +} + +static xcf_hierarchy * read_xcf_hierarchy (SDL_RWops * src) { + xcf_hierarchy * h; + int i; + + h = (xcf_hierarchy *) SDL_malloc (sizeof (xcf_hierarchy)); + h->width = SDL_ReadBE32 (src); + h->height = SDL_ReadBE32 (src); + h->bpp = SDL_ReadBE32 (src); + + h->level_file_offsets = NULL; + i = 0; + do { + h->level_file_offsets = (Uint32 *) SDL_realloc (h->level_file_offsets, sizeof (Uint32) * (i+1)); + h->level_file_offsets [i] = SDL_ReadBE32 (src); + } while (h->level_file_offsets [i++]); + + return h; +} + +static void free_xcf_level (xcf_level * l) { + SDL_free (l->tile_file_offsets); + SDL_free (l); +} + +static xcf_level * read_xcf_level (SDL_RWops * src) { + xcf_level * l; + int i; + + l = (xcf_level *) SDL_malloc (sizeof (xcf_level)); + l->width = SDL_ReadBE32 (src); + l->height = SDL_ReadBE32 (src); + + l->tile_file_offsets = NULL; + i = 0; + do { + l->tile_file_offsets = (Uint32 *) SDL_realloc (l->tile_file_offsets, sizeof (Uint32) * (i+1)); + l->tile_file_offsets [i] = SDL_ReadBE32 (src); + } while (l->tile_file_offsets [i++]); + + return l; +} + +static void free_xcf_tile (unsigned char * t) { + SDL_free (t); +} + +static unsigned char * load_xcf_tile_none (SDL_RWops * src, Uint32 len, int bpp, int x, int y) { + unsigned char * load; + + load = (unsigned char *) SDL_malloc (len); // expect this is okay + SDL_RWread (src, load, len, 1); + + return load; +} + +static unsigned char * load_xcf_tile_rle (SDL_RWops * src, Uint32 len, int bpp, int x, int y) { + unsigned char * load, * t, * data, * d; + Uint32 reallen; + int i, size, count, j, length; + unsigned char val; + + t = load = (unsigned char *) SDL_malloc (len); + reallen = SDL_RWread (src, t, 1, len); + + data = (unsigned char *) SDL_malloc (x*y*bpp); + for (i = 0; i < bpp; i++) { + d = data + i; + size = x*y; + count = 0; + + while (size > 0) { + val = *t++; + + length = val; + if (length >= 128) { + length = 255 - (length - 1); + if (length == 128) { + length = (*t << 8) + t[1]; + t += 2; + } + + count += length; + size -= length; + + while (length-- > 0) { + *d = *t++; + d += bpp; + } + } + else { + length += 1; + if (length == 128) { + length = (*t << 8) + t[1]; + t += 2; + } + + count += length; + size -= length; + + val = *t++; + + for (j = 0; j < length; j++) { + *d = val; + d += bpp; + } + } + } + } + + SDL_free (load); + return (data); +} + +static Uint32 rgb2grey (Uint32 a) { + Uint8 l; + l = (Uint8)(0.2990 * ((a & 0x00FF0000) >> 16) + + 0.5870 * ((a & 0x0000FF00) >> 8) + + 0.1140 * ((a & 0x000000FF))); + + return (l << 16) | (l << 8) | l; +} + +static void create_channel_surface (SDL_Surface * surf, xcf_image_type itype, Uint32 color, Uint32 opacity) { + Uint32 c = 0; + + switch (itype) { + case IMAGE_RGB: + case IMAGE_INDEXED: + c = opacity | color; + break; + case IMAGE_GREYSCALE: + c = opacity | rgb2grey (color); + break; + } + SDL_FillRect (surf, NULL, c); +} + +static int do_layer_surface (SDL_Surface * surface, SDL_RWops * src, xcf_header * head, xcf_layer * layer, load_tile_type load_tile) { + xcf_hierarchy * hierarchy; + xcf_level * level; + unsigned char * tile; + Uint8 * p8; + Uint16 * p16; + Uint32 * p; + int i, j; + Uint32 x, y, tx, ty, ox, oy; + Uint32 *row; + + SDL_RWseek (src, layer->hierarchy_file_offset, RW_SEEK_SET); + hierarchy = read_xcf_hierarchy (src); + + level = NULL; + for (i = 0; hierarchy->level_file_offsets [i]; i++) { + SDL_RWseek (src, hierarchy->level_file_offsets [i], RW_SEEK_SET); + level = read_xcf_level (src); + + ty = tx = 0; + for (j = 0; level->tile_file_offsets [j]; j++) { + SDL_RWseek (src, level->tile_file_offsets [j], RW_SEEK_SET); + ox = tx+64 > level->width ? level->width % 64 : 64; + oy = ty+64 > level->height ? level->height % 64 : 64; + + if (level->tile_file_offsets [j+1]) { + tile = load_tile + (src, + level->tile_file_offsets [j+1] - level->tile_file_offsets [j], + hierarchy->bpp, + ox, oy); + } + else { + tile = load_tile + (src, + ox*oy*6, + hierarchy->bpp, + ox, oy); + } + + p8 = tile; + p16 = (Uint16 *) p8; + p = (Uint32 *) p8; + for (y=ty; y < ty+oy; y++) { + row = (Uint32 *)((Uint8 *)surface->pixels + y*surface->pitch + tx*4); + switch (hierarchy->bpp) { + case 4: + for (x=tx; x < tx+ox; x++) + *row++ = Swap32 (*p++); + break; + case 3: + for (x=tx; x < tx+ox; x++) { + *row = 0xFF000000; + *row |= ((Uint32) *(p8++) << 16); + *row |= ((Uint32) *(p8++) << 8); + *row |= ((Uint32) *(p8++) << 0); + row++; + } + break; + case 2: // Indexed/Greyscale + Alpha + switch (head->image_type) { + case IMAGE_INDEXED: + for (x=tx; x < tx+ox; x++) { + *row = ((Uint32) (head->cm_map [*p8*3]) << 16); + *row |= ((Uint32) (head->cm_map [*p8*3+1]) << 8); + *row |= ((Uint32) (head->cm_map [*p8++*3+2]) << 0); + *row |= ((Uint32) *p8++ << 24);; + row++; + } + break; + case IMAGE_GREYSCALE: + for (x=tx; x < tx+ox; x++) { + *row = ((Uint32) *p8 << 16); + *row |= ((Uint32) *p8 << 8); + *row |= ((Uint32) *p8++ << 0); + *row |= ((Uint32) *p8++ << 24);; + row++; + } + break; + default: + fprintf (stderr, "Unknown Gimp image type (%d)\n", head->image_type); + if (hierarchy) + { + if (hierarchy->level_file_offsets) + SDL_free(hierarchy->level_file_offsets); + + free_xcf_hierarchy(hierarchy); + } + if (level) + free_xcf_level (level); + return 1; + } + break; + case 1: // Indexed/Greyscale + switch (head->image_type) { + case IMAGE_INDEXED: + for (x = tx; x < tx+ox; x++) { + *row++ = 0xFF000000 + | ((Uint32) (head->cm_map [*p8*3]) << 16) + | ((Uint32) (head->cm_map [*p8*3+1]) << 8) + | ((Uint32) (head->cm_map [*p8*3+2]) << 0); + p8++; + } + break; + case IMAGE_GREYSCALE: + for (x=tx; x < tx+ox; x++) { + *row++ = 0xFF000000 + | (((Uint32) (*p8)) << 16) + | (((Uint32) (*p8)) << 8) + | (((Uint32) (*p8)) << 0); + ++p8; + } + break; + default: + fprintf (stderr, "Unknown Gimp image type (%d)\n", head->image_type); + if (tile) + free_xcf_tile (tile); + if (level) + free_xcf_level (level); + if (hierarchy) + free_xcf_hierarchy (hierarchy); + return 1; + } + break; + } + } + tx += 64; + if (tx >= level->width) { + tx = 0; + ty += 64; + } + if (ty >= level->height) { + break; + } + + free_xcf_tile (tile); + } + free_xcf_level (level); + } + + free_xcf_hierarchy (hierarchy); + + return 0; +} + +SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src) +{ + Sint64 start; + const char *error = NULL; + SDL_Surface *surface, *lays; + xcf_header * head; + xcf_layer * layer; + xcf_channel ** channel; + int chnls, i, offsets; + Sint64 offset, fp; + + unsigned char * (* load_tile) (SDL_RWops *, Uint32, int, int, int); + + if ( !src ) { + /* The error message has been set in SDL_RWFromFile */ + return NULL; + } + start = SDL_RWtell(src); + + /* Initialize the data we will clean up when we're done */ + surface = NULL; + + head = read_xcf_header (src); + + switch (head->compr) { + case COMPR_NONE: + load_tile = load_xcf_tile_none; + break; + case COMPR_RLE: + load_tile = load_xcf_tile_rle; + break; + default: + fprintf (stderr, "Unsupported Compression.\n"); + free_xcf_header (head); + return NULL; + } + + /* Create the surface of the appropriate type */ + surface = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32, + 0x00FF0000,0x0000FF00,0x000000FF,0xFF000000); + + if ( surface == NULL ) { + error = "Out of memory"; + goto done; + } + + offsets = 0; + + while ((offset = SDL_ReadBE32 (src))) { + head->layer_file_offsets = (Uint32 *) SDL_realloc (head->layer_file_offsets, sizeof (Uint32) * (offsets+1)); + head->layer_file_offsets [offsets] = (Uint32)offset; + offsets++; + } + fp = SDL_RWtell (src); + + lays = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32, + 0x00FF0000,0x0000FF00,0x000000FF,0xFF000000); + + if ( lays == NULL ) { + error = "Out of memory"; + goto done; + } + + // Blit layers backwards, because Gimp saves them highest first + for (i = offsets; i > 0; i--) { + SDL_Rect rs, rd; + SDL_RWseek (src, head->layer_file_offsets [i-1], RW_SEEK_SET); + + layer = read_xcf_layer (src); + do_layer_surface (lays, src, head, layer, load_tile); + rs.x = 0; + rs.y = 0; + rs.w = layer->width; + rs.h = layer->height; + rd.x = layer->offset_x; + rd.y = layer->offset_y; + rd.w = layer->width; + rd.h = layer->height; + + if (layer->visible) + SDL_BlitSurface (lays, &rs, surface, &rd); + free_xcf_layer (layer); + } + + SDL_FreeSurface (lays); + + SDL_RWseek (src, fp, RW_SEEK_SET); + + // read channels + channel = NULL; + chnls = 0; + while ((offset = SDL_ReadBE32 (src))) { + channel = (xcf_channel **) SDL_realloc (channel, sizeof (xcf_channel *) * (chnls+1)); + fp = SDL_RWtell (src); + SDL_RWseek (src, offset, RW_SEEK_SET); + channel [chnls++] = (read_xcf_channel (src)); + SDL_RWseek (src, fp, RW_SEEK_SET); + } + + if (chnls) { + SDL_Surface * chs; + + chs = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32, + 0x00FF0000,0x0000FF00,0x000000FF,0xFF000000); + + if (chs == NULL) { + error = "Out of memory"; + goto done; + } + for (i = 0; i < chnls; i++) { + // printf ("CNLBLT %i\n", i); + if (!channel [i]->selection && channel [i]->visible) { + create_channel_surface (chs, (xcf_image_type)head->image_type, channel [i]->color, channel [i]->opacity); + SDL_BlitSurface (chs, NULL, surface, NULL); + } + free_xcf_channel (channel [i]); + } + + SDL_FreeSurface (chs); + } + +done: + free_xcf_header (head); + if ( error ) { + SDL_RWseek(src, start, RW_SEEK_SET); + if ( surface ) { + SDL_FreeSurface(surface); + surface = NULL; + } + IMG_SetError(error); + } + + return(surface); +} + +#else + +/* See if an image is contained in a data source */ +int IMG_isXCF(SDL_RWops *src) +{ + return(0); +} + +/* Load a XCF type image from an SDL datasource */ +SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src) +{ + return(NULL); +} + +#endif /* LOAD_XCF */ diff --git a/project/jni/sdl2_image/IMG_xpm.c b/project/jni/sdl2_image/IMG_xpm.c new file mode 100644 index 000000000..c5dd2c671 --- /dev/null +++ b/project/jni/sdl2_image/IMG_xpm.c @@ -0,0 +1,1187 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/* + * XPM (X PixMap) image loader: + * + * Supports the XPMv3 format, EXCEPT: + * - hotspot coordinates are ignored + * - only colour ('c') colour symbols are used + * - rgb.txt is not used (for portability), so only RGB colours + * are recognized (#rrggbb etc) - only a few basic colour names are + * handled + * + * The result is an 8bpp indexed surface if possible, otherwise 32bpp. + * The colourkey is correctly set if transparency is used. + * + * Besides the standard API, also provides + * + * SDL_Surface *IMG_ReadXPMFromArray(char **xpm) + * + * that reads the image data from an XPM file included in the C source. + * + * TODO: include rgb.txt here. The full table (from solaris 2.6) only + * requires about 13K in binary form. + */ + +#include +#include +#include +#include + +#include "SDL_image.h" + +#ifdef LOAD_XPM + +/* See if an image is contained in a data source */ +int IMG_isXPM(SDL_RWops *src) +{ + Sint64 start; + int is_XPM; + char magic[9]; + + if ( !src ) + return 0; + start = SDL_RWtell(src); + is_XPM = 0; + if ( SDL_RWread(src, magic, sizeof(magic), 1) ) { + if ( SDL_memcmp(magic, "/* XPM */", sizeof(magic)) == 0 ) { + is_XPM = 1; + } + } + SDL_RWseek(src, start, RW_SEEK_SET); + return(is_XPM); +} + +/* Hash table to look up colors from pixel strings */ +#define STARTING_HASH_SIZE 256 + +struct hash_entry { + char *key; + Uint32 color; + struct hash_entry *next; +}; + +struct color_hash { + struct hash_entry **table; + struct hash_entry *entries; /* array of all entries */ + struct hash_entry *next_free; + int size; + int maxnum; +}; + +static int hash_key(const char *key, int cpp, int size) +{ + int hash; + + hash = 0; + while ( cpp-- > 0 ) { + hash = hash * 33 + *key++; + } + return hash & (size - 1); +} + +static struct color_hash *create_colorhash(int maxnum) +{ + int bytes, s; + struct color_hash *hash; + + /* we know how many entries we need, so we can allocate + everything here */ + hash = (struct color_hash *)SDL_malloc(sizeof *hash); + if(!hash) + return NULL; + + /* use power-of-2 sized hash table for decoding speed */ + for(s = STARTING_HASH_SIZE; s < maxnum; s <<= 1) + ; + hash->size = s; + hash->maxnum = maxnum; + bytes = hash->size * sizeof(struct hash_entry **); + hash->entries = NULL; /* in case malloc fails */ + hash->table = (struct hash_entry **)SDL_malloc(bytes); + if(!hash->table) { + SDL_free(hash); + return NULL; + } + memset(hash->table, 0, bytes); + hash->entries = (struct hash_entry *)SDL_malloc(maxnum * sizeof(struct hash_entry)); + if(!hash->entries) { + SDL_free(hash->table); + SDL_free(hash); + return NULL; + } + hash->next_free = hash->entries; + return hash; +} + +static int add_colorhash(struct color_hash *hash, + char *key, int cpp, Uint32 color) +{ + int index = hash_key(key, cpp, hash->size); + struct hash_entry *e = hash->next_free++; + e->color = color; + e->key = key; + e->next = hash->table[index]; + hash->table[index] = e; + return 1; +} + +/* fast lookup that works if cpp == 1 */ +#define QUICK_COLORHASH(hash, key) ((hash)->table[*(Uint8 *)(key)]->color) + +static Uint32 get_colorhash(struct color_hash *hash, const char *key, int cpp) +{ + struct hash_entry *entry = hash->table[hash_key(key, cpp, hash->size)]; + while(entry) { + if(SDL_memcmp(key, entry->key, cpp) == 0) + return entry->color; + entry = entry->next; + } + return 0; /* garbage in - garbage out */ +} + +static void free_colorhash(struct color_hash *hash) +{ + if(hash) { + if(hash->table) + SDL_free(hash->table); + if(hash->entries) + SDL_free(hash->entries); + SDL_free(hash); + } +} + +/* + * convert colour spec to RGB (in 0xrrggbb format). + * return 1 if successful. + */ +static int color_to_rgb(char *spec, int speclen, Uint32 *rgb) +{ + /* poor man's rgb.txt */ + static struct { char *name; Uint32 rgb; } known[] = { + { "none", 0xFFFFFF }, + { "black", 0x000000 }, + { "white", 0xFFFFFF }, + { "red", 0xFF0000 }, + { "green", 0x00FF00 }, + { "blue", 0x0000FF }, +/* This table increases the size of the library by 40K, so it's disabled by default */ +#ifdef EXTENDED_XPM_COLORS + { "aliceblue", 0xf0f8ff }, + { "antiquewhite", 0xfaebd7 }, + { "antiquewhite1", 0xffefdb }, + { "antiquewhite2", 0xeedfcc }, + { "antiquewhite3", 0xcdc0b0 }, + { "antiquewhite4", 0x8b8378 }, + { "aqua", 0x00ffff }, + { "aquamarine", 0x7fffd4 }, + { "aquamarine1", 0x7fffd4 }, + { "aquamarine2", 0x76eec6 }, + { "aquamarine3", 0x66cdaa }, + { "aquamarine4", 0x458b74 }, + { "azure", 0xf0ffff }, + { "azure1", 0xf0ffff }, + { "azure2", 0xe0eeee }, + { "azure3", 0xc1cdcd }, + { "azure4", 0x838b8b }, + { "beige", 0xf5f5dc }, + { "bisque", 0xffe4c4 }, + { "bisque1", 0xffe4c4 }, + { "bisque2", 0xeed5b7 }, + { "bisque3", 0xcdb79e }, + { "bisque4", 0x8b7d6b }, + { "black", 0x000000 }, + { "blanchedalmond", 0xffebcd }, + { "blue", 0x0000ff }, + { "blue1", 0x0000ff }, + { "blue2", 0x0000ee }, + { "blue3", 0x0000cd }, + { "blue4", 0x00008B }, + { "blueviolet", 0x8a2be2 }, + { "brown", 0xA52A2A }, + { "brown1", 0xFF4040 }, + { "brown2", 0xEE3B3B }, + { "brown3", 0xCD3333 }, + { "brown4", 0x8B2323 }, + { "burlywood", 0xDEB887 }, + { "burlywood1", 0xFFD39B }, + { "burlywood2", 0xEEC591 }, + { "burlywood3", 0xCDAA7D }, + { "burlywood4", 0x8B7355 }, + { "cadetblue", 0x5F9EA0 }, + { "cadetblue", 0x5f9ea0 }, + { "cadetblue1", 0x98f5ff }, + { "cadetblue2", 0x8ee5ee }, + { "cadetblue3", 0x7ac5cd }, + { "cadetblue4", 0x53868b }, + { "chartreuse", 0x7FFF00 }, + { "chartreuse1", 0x7FFF00 }, + { "chartreuse2", 0x76EE00 }, + { "chartreuse3", 0x66CD00 }, + { "chartreuse4", 0x458B00 }, + { "chocolate", 0xD2691E }, + { "chocolate1", 0xFF7F24 }, + { "chocolate2", 0xEE7621 }, + { "chocolate3", 0xCD661D }, + { "chocolate4", 0x8B4513 }, + { "coral", 0xFF7F50 }, + { "coral1", 0xFF7256 }, + { "coral2", 0xEE6A50 }, + { "coral3", 0xCD5B45 }, + { "coral4", 0x8B3E2F }, + { "cornflowerblue", 0x6495ed }, + { "cornsilk", 0xFFF8DC }, + { "cornsilk1", 0xFFF8DC }, + { "cornsilk2", 0xEEE8CD }, + { "cornsilk3", 0xCDC8B1 }, + { "cornsilk4", 0x8B8878 }, + { "crimson", 0xDC143C }, + { "cyan", 0x00FFFF }, + { "cyan1", 0x00FFFF }, + { "cyan2", 0x00EEEE }, + { "cyan3", 0x00CDCD }, + { "cyan4", 0x008B8B }, + { "darkblue", 0x00008b }, + { "darkcyan", 0x008b8b }, + { "darkgoldenrod", 0xb8860b }, + { "darkgoldenrod1", 0xffb90f }, + { "darkgoldenrod2", 0xeead0e }, + { "darkgoldenrod3", 0xcd950c }, + { "darkgoldenrod4", 0x8b6508 }, + { "darkgray", 0xa9a9a9 }, + { "darkgreen", 0x006400 }, + { "darkgrey", 0xa9a9a9 }, + { "darkkhaki", 0xbdb76b }, + { "darkmagenta", 0x8b008b }, + { "darkolivegreen", 0x556b2f }, + { "darkolivegreen1", 0xcaff70 }, + { "darkolivegreen2", 0xbcee68 }, + { "darkolivegreen3", 0xa2cd5a }, + { "darkolivegreen4", 0x6e8b3d }, + { "darkorange", 0xff8c00 }, + { "darkorange1", 0xff7f00 }, + { "darkorange2", 0xee7600 }, + { "darkorange3", 0xcd6600 }, + { "darkorange4", 0x8b4500 }, + { "darkorchid", 0x9932cc }, + { "darkorchid1", 0xbf3eff }, + { "darkorchid2", 0xb23aee }, + { "darkorchid3", 0x9a32cd }, + { "darkorchid4", 0x68228b }, + { "darkred", 0x8b0000 }, + { "darksalmon", 0xe9967a }, + { "darkseagreen", 0x8fbc8f }, + { "darkseagreen1", 0xc1ffc1 }, + { "darkseagreen2", 0xb4eeb4 }, + { "darkseagreen3", 0x9bcd9b }, + { "darkseagreen4", 0x698b69 }, + { "darkslateblue", 0x483d8b }, + { "darkslategray", 0x2f4f4f }, + { "darkslategray1", 0x97ffff }, + { "darkslategray2", 0x8deeee }, + { "darkslategray3", 0x79cdcd }, + { "darkslategray4", 0x528b8b }, + { "darkslategrey", 0x2f4f4f }, + { "darkturquoise", 0x00ced1 }, + { "darkviolet", 0x9400D3 }, + { "darkviolet", 0x9400d3 }, + { "deeppink", 0xff1493 }, + { "deeppink1", 0xff1493 }, + { "deeppink2", 0xee1289 }, + { "deeppink3", 0xcd1076 }, + { "deeppink4", 0x8b0a50 }, + { "deepskyblue", 0x00bfff }, + { "deepskyblue1", 0x00bfff }, + { "deepskyblue2", 0x00b2ee }, + { "deepskyblue3", 0x009acd }, + { "deepskyblue4", 0x00688b }, + { "dimgray", 0x696969 }, + { "dimgrey", 0x696969 }, + { "dodgerblue", 0x1e90ff }, + { "dodgerblue1", 0x1e90ff }, + { "dodgerblue2", 0x1c86ee }, + { "dodgerblue3", 0x1874cd }, + { "dodgerblue4", 0x104e8b }, + { "firebrick", 0xB22222 }, + { "firebrick1", 0xFF3030 }, + { "firebrick2", 0xEE2C2C }, + { "firebrick3", 0xCD2626 }, + { "firebrick4", 0x8B1A1A }, + { "floralwhite", 0xfffaf0 }, + { "forestgreen", 0x228b22 }, + { "fractal", 0x808080 }, + { "fuchsia", 0xFF00FF }, + { "gainsboro", 0xDCDCDC }, + { "ghostwhite", 0xf8f8ff }, + { "gold", 0xFFD700 }, + { "gold1", 0xFFD700 }, + { "gold2", 0xEEC900 }, + { "gold3", 0xCDAD00 }, + { "gold4", 0x8B7500 }, + { "goldenrod", 0xDAA520 }, + { "goldenrod1", 0xFFC125 }, + { "goldenrod2", 0xEEB422 }, + { "goldenrod3", 0xCD9B1D }, + { "goldenrod4", 0x8B6914 }, + { "gray", 0x7E7E7E }, + { "gray", 0xBEBEBE }, + { "gray0", 0x000000 }, + { "gray1", 0x030303 }, + { "gray10", 0x1A1A1A }, + { "gray100", 0xFFFFFF }, + { "gray11", 0x1C1C1C }, + { "gray12", 0x1F1F1F }, + { "gray13", 0x212121 }, + { "gray14", 0x242424 }, + { "gray15", 0x262626 }, + { "gray16", 0x292929 }, + { "gray17", 0x2B2B2B }, + { "gray18", 0x2E2E2E }, + { "gray19", 0x303030 }, + { "gray2", 0x050505 }, + { "gray20", 0x333333 }, + { "gray21", 0x363636 }, + { "gray22", 0x383838 }, + { "gray23", 0x3B3B3B }, + { "gray24", 0x3D3D3D }, + { "gray25", 0x404040 }, + { "gray26", 0x424242 }, + { "gray27", 0x454545 }, + { "gray28", 0x474747 }, + { "gray29", 0x4A4A4A }, + { "gray3", 0x080808 }, + { "gray30", 0x4D4D4D }, + { "gray31", 0x4F4F4F }, + { "gray32", 0x525252 }, + { "gray33", 0x545454 }, + { "gray34", 0x575757 }, + { "gray35", 0x595959 }, + { "gray36", 0x5C5C5C }, + { "gray37", 0x5E5E5E }, + { "gray38", 0x616161 }, + { "gray39", 0x636363 }, + { "gray4", 0x0A0A0A }, + { "gray40", 0x666666 }, + { "gray41", 0x696969 }, + { "gray42", 0x6B6B6B }, + { "gray43", 0x6E6E6E }, + { "gray44", 0x707070 }, + { "gray45", 0x737373 }, + { "gray46", 0x757575 }, + { "gray47", 0x787878 }, + { "gray48", 0x7A7A7A }, + { "gray49", 0x7D7D7D }, + { "gray5", 0x0D0D0D }, + { "gray50", 0x7F7F7F }, + { "gray51", 0x828282 }, + { "gray52", 0x858585 }, + { "gray53", 0x878787 }, + { "gray54", 0x8A8A8A }, + { "gray55", 0x8C8C8C }, + { "gray56", 0x8F8F8F }, + { "gray57", 0x919191 }, + { "gray58", 0x949494 }, + { "gray59", 0x969696 }, + { "gray6", 0x0F0F0F }, + { "gray60", 0x999999 }, + { "gray61", 0x9C9C9C }, + { "gray62", 0x9E9E9E }, + { "gray63", 0xA1A1A1 }, + { "gray64", 0xA3A3A3 }, + { "gray65", 0xA6A6A6 }, + { "gray66", 0xA8A8A8 }, + { "gray67", 0xABABAB }, + { "gray68", 0xADADAD }, + { "gray69", 0xB0B0B0 }, + { "gray7", 0x121212 }, + { "gray70", 0xB3B3B3 }, + { "gray71", 0xB5B5B5 }, + { "gray72", 0xB8B8B8 }, + { "gray73", 0xBABABA }, + { "gray74", 0xBDBDBD }, + { "gray75", 0xBFBFBF }, + { "gray76", 0xC2C2C2 }, + { "gray77", 0xC4C4C4 }, + { "gray78", 0xC7C7C7 }, + { "gray79", 0xC9C9C9 }, + { "gray8", 0x141414 }, + { "gray80", 0xCCCCCC }, + { "gray81", 0xCFCFCF }, + { "gray82", 0xD1D1D1 }, + { "gray83", 0xD4D4D4 }, + { "gray84", 0xD6D6D6 }, + { "gray85", 0xD9D9D9 }, + { "gray86", 0xDBDBDB }, + { "gray87", 0xDEDEDE }, + { "gray88", 0xE0E0E0 }, + { "gray89", 0xE3E3E3 }, + { "gray9", 0x171717 }, + { "gray90", 0xE5E5E5 }, + { "gray91", 0xE8E8E8 }, + { "gray92", 0xEBEBEB }, + { "gray93", 0xEDEDED }, + { "gray94", 0xF0F0F0 }, + { "gray95", 0xF2F2F2 }, + { "gray96", 0xF5F5F5 }, + { "gray97", 0xF7F7F7 }, + { "gray98", 0xFAFAFA }, + { "gray99", 0xFCFCFC }, + { "green", 0x008000 }, + { "green", 0x00FF00 }, + { "green1", 0x00FF00 }, + { "green2", 0x00EE00 }, + { "green3", 0x00CD00 }, + { "green4", 0x008B00 }, + { "greenyellow", 0xadff2f }, + { "grey", 0xBEBEBE }, + { "grey0", 0x000000 }, + { "grey1", 0x030303 }, + { "grey10", 0x1A1A1A }, + { "grey100", 0xFFFFFF }, + { "grey11", 0x1C1C1C }, + { "grey12", 0x1F1F1F }, + { "grey13", 0x212121 }, + { "grey14", 0x242424 }, + { "grey15", 0x262626 }, + { "grey16", 0x292929 }, + { "grey17", 0x2B2B2B }, + { "grey18", 0x2E2E2E }, + { "grey19", 0x303030 }, + { "grey2", 0x050505 }, + { "grey20", 0x333333 }, + { "grey21", 0x363636 }, + { "grey22", 0x383838 }, + { "grey23", 0x3B3B3B }, + { "grey24", 0x3D3D3D }, + { "grey25", 0x404040 }, + { "grey26", 0x424242 }, + { "grey27", 0x454545 }, + { "grey28", 0x474747 }, + { "grey29", 0x4A4A4A }, + { "grey3", 0x080808 }, + { "grey30", 0x4D4D4D }, + { "grey31", 0x4F4F4F }, + { "grey32", 0x525252 }, + { "grey33", 0x545454 }, + { "grey34", 0x575757 }, + { "grey35", 0x595959 }, + { "grey36", 0x5C5C5C }, + { "grey37", 0x5E5E5E }, + { "grey38", 0x616161 }, + { "grey39", 0x636363 }, + { "grey4", 0x0A0A0A }, + { "grey40", 0x666666 }, + { "grey41", 0x696969 }, + { "grey42", 0x6B6B6B }, + { "grey43", 0x6E6E6E }, + { "grey44", 0x707070 }, + { "grey45", 0x737373 }, + { "grey46", 0x757575 }, + { "grey47", 0x787878 }, + { "grey48", 0x7A7A7A }, + { "grey49", 0x7D7D7D }, + { "grey5", 0x0D0D0D }, + { "grey50", 0x7F7F7F }, + { "grey51", 0x828282 }, + { "grey52", 0x858585 }, + { "grey53", 0x878787 }, + { "grey54", 0x8A8A8A }, + { "grey55", 0x8C8C8C }, + { "grey56", 0x8F8F8F }, + { "grey57", 0x919191 }, + { "grey58", 0x949494 }, + { "grey59", 0x969696 }, + { "grey6", 0x0F0F0F }, + { "grey60", 0x999999 }, + { "grey61", 0x9C9C9C }, + { "grey62", 0x9E9E9E }, + { "grey63", 0xA1A1A1 }, + { "grey64", 0xA3A3A3 }, + { "grey65", 0xA6A6A6 }, + { "grey66", 0xA8A8A8 }, + { "grey67", 0xABABAB }, + { "grey68", 0xADADAD }, + { "grey69", 0xB0B0B0 }, + { "grey7", 0x121212 }, + { "grey70", 0xB3B3B3 }, + { "grey71", 0xB5B5B5 }, + { "grey72", 0xB8B8B8 }, + { "grey73", 0xBABABA }, + { "grey74", 0xBDBDBD }, + { "grey75", 0xBFBFBF }, + { "grey76", 0xC2C2C2 }, + { "grey77", 0xC4C4C4 }, + { "grey78", 0xC7C7C7 }, + { "grey79", 0xC9C9C9 }, + { "grey8", 0x141414 }, + { "grey80", 0xCCCCCC }, + { "grey81", 0xCFCFCF }, + { "grey82", 0xD1D1D1 }, + { "grey83", 0xD4D4D4 }, + { "grey84", 0xD6D6D6 }, + { "grey85", 0xD9D9D9 }, + { "grey86", 0xDBDBDB }, + { "grey87", 0xDEDEDE }, + { "grey88", 0xE0E0E0 }, + { "grey89", 0xE3E3E3 }, + { "grey9", 0x171717 }, + { "grey90", 0xE5E5E5 }, + { "grey91", 0xE8E8E8 }, + { "grey92", 0xEBEBEB }, + { "grey93", 0xEDEDED }, + { "grey94", 0xF0F0F0 }, + { "grey95", 0xF2F2F2 }, + { "grey96", 0xF5F5F5 }, + { "grey97", 0xF7F7F7 }, + { "grey98", 0xFAFAFA }, + { "grey99", 0xFCFCFC }, + { "honeydew", 0xF0FFF0 }, + { "honeydew1", 0xF0FFF0 }, + { "honeydew2", 0xE0EEE0 }, + { "honeydew3", 0xC1CDC1 }, + { "honeydew4", 0x838B83 }, + { "hotpink", 0xff69b4 }, + { "hotpink1", 0xff6eb4 }, + { "hotpink2", 0xee6aa7 }, + { "hotpink3", 0xcd6090 }, + { "hotpink4", 0x8b3a62 }, + { "indianred", 0xcd5c5c }, + { "indianred1", 0xff6a6a }, + { "indianred2", 0xee6363 }, + { "indianred3", 0xcd5555 }, + { "indianred4", 0x8b3a3a }, + { "indigo", 0x4B0082 }, + { "ivory", 0xFFFFF0 }, + { "ivory1", 0xFFFFF0 }, + { "ivory2", 0xEEEEE0 }, + { "ivory3", 0xCDCDC1 }, + { "ivory4", 0x8B8B83 }, + { "khaki", 0xF0E68C }, + { "khaki1", 0xFFF68F }, + { "khaki2", 0xEEE685 }, + { "khaki3", 0xCDC673 }, + { "khaki4", 0x8B864E }, + { "lavender", 0xE6E6FA }, + { "lavenderblush", 0xfff0f5 }, + { "lavenderblush1", 0xfff0f5 }, + { "lavenderblush2", 0xeee0e5 }, + { "lavenderblush3", 0xcdc1c5 }, + { "lavenderblush4", 0x8b8386 }, + { "lawngreen", 0x7cfc00 }, + { "lemonchiffon", 0xfffacd }, + { "lemonchiffon1", 0xfffacd }, + { "lemonchiffon2", 0xeee9bf }, + { "lemonchiffon3", 0xcdc9a5 }, + { "lemonchiffon4", 0x8b8970 }, + { "lightblue", 0xadd8e6 }, + { "lightblue1", 0xbfefff }, + { "lightblue2", 0xb2dfee }, + { "lightblue3", 0x9ac0cd }, + { "lightblue4", 0x68838b }, + { "lightcoral", 0xf08080 }, + { "lightcyan", 0xe0ffff }, + { "lightcyan1", 0xe0ffff }, + { "lightcyan2", 0xd1eeee }, + { "lightcyan3", 0xb4cdcd }, + { "lightcyan4", 0x7a8b8b }, + { "lightgoldenrod", 0xeedd82 }, + { "lightgoldenrod1", 0xffec8b }, + { "lightgoldenrod2", 0xeedc82 }, + { "lightgoldenrod3", 0xcdbe70 }, + { "lightgoldenrod4", 0x8b814c }, + { "lightgoldenrodyellow", 0xfafad2 }, + { "lightgray", 0xd3d3d3 }, + { "lightgreen", 0x90ee90 }, + { "lightgrey", 0xd3d3d3 }, + { "lightpink", 0xffb6c1 }, + { "lightpink1", 0xffaeb9 }, + { "lightpink2", 0xeea2ad }, + { "lightpink3", 0xcd8c95 }, + { "lightpink4", 0x8b5f65 }, + { "lightsalmon", 0xffa07a }, + { "lightsalmon1", 0xffa07a }, + { "lightsalmon2", 0xee9572 }, + { "lightsalmon3", 0xcd8162 }, + { "lightsalmon4", 0x8b5742 }, + { "lightseagreen", 0x20b2aa }, + { "lightskyblue", 0x87cefa }, + { "lightskyblue1", 0xb0e2ff }, + { "lightskyblue2", 0xa4d3ee }, + { "lightskyblue3", 0x8db6cd }, + { "lightskyblue4", 0x607b8b }, + { "lightslateblue", 0x8470ff }, + { "lightslategray", 0x778899 }, + { "lightslategrey", 0x778899 }, + { "lightsteelblue", 0xb0c4de }, + { "lightsteelblue1", 0xcae1ff }, + { "lightsteelblue2", 0xbcd2ee }, + { "lightsteelblue3", 0xa2b5cd }, + { "lightsteelblue4", 0x6e7b8b }, + { "lightyellow", 0xffffe0 }, + { "lightyellow1", 0xffffe0 }, + { "lightyellow2", 0xeeeed1 }, + { "lightyellow3", 0xcdcdb4 }, + { "lightyellow4", 0x8b8b7a }, + { "lime", 0x00FF00 }, + { "limegreen", 0x32cd32 }, + { "linen", 0xFAF0E6 }, + { "magenta", 0xFF00FF }, + { "magenta1", 0xFF00FF }, + { "magenta2", 0xEE00EE }, + { "magenta3", 0xCD00CD }, + { "magenta4", 0x8B008B }, + { "maroon", 0x800000 }, + { "maroon", 0xB03060 }, + { "maroon1", 0xFF34B3 }, + { "maroon2", 0xEE30A7 }, + { "maroon3", 0xCD2990 }, + { "maroon4", 0x8B1C62 }, + { "mediumaquamarine", 0x66cdaa }, + { "mediumblue", 0x0000cd }, + { "mediumforestgreen", 0x32814b }, + { "mediumgoldenrod", 0xd1c166 }, + { "mediumorchid", 0xba55d3 }, + { "mediumorchid1", 0xe066ff }, + { "mediumorchid2", 0xd15fee }, + { "mediumorchid3", 0xb452cd }, + { "mediumorchid4", 0x7a378b }, + { "mediumpurple", 0x9370db }, + { "mediumpurple1", 0xab82ff }, + { "mediumpurple2", 0x9f79ee }, + { "mediumpurple3", 0x8968cd }, + { "mediumpurple4", 0x5d478b }, + { "mediumseagreen", 0x3cb371 }, + { "mediumslateblue", 0x7b68ee }, + { "mediumspringgreen", 0x00fa9a }, + { "mediumturquoise", 0x48d1cc }, + { "mediumvioletred", 0xc71585 }, + { "midnightblue", 0x191970 }, + { "mintcream", 0xf5fffa }, + { "mistyrose", 0xffe4e1 }, + { "mistyrose1", 0xffe4e1 }, + { "mistyrose2", 0xeed5d2 }, + { "mistyrose3", 0xcdb7b5 }, + { "mistyrose4", 0x8b7d7b }, + { "moccasin", 0xFFE4B5 }, + { "navajowhite", 0xffdead }, + { "navajowhite1", 0xffdead }, + { "navajowhite2", 0xeecfa1 }, + { "navajowhite3", 0xcdb38b }, + { "navajowhite4", 0x8b795e }, + { "navy", 0x000080 }, + { "navyblue", 0x000080 }, + { "none", 0x0000FF }, + { "oldlace", 0xfdf5e6 }, + { "olive", 0x808000 }, + { "olivedrab", 0x6b8e23 }, + { "olivedrab1", 0xc0ff3e }, + { "olivedrab2", 0xb3ee3a }, + { "olivedrab3", 0x9acd32 }, + { "olivedrab4", 0x698b22 }, + { "opaque", 0x000000 }, + { "orange", 0xFFA500 }, + { "orange1", 0xFFA500 }, + { "orange2", 0xEE9A00 }, + { "orange3", 0xCD8500 }, + { "orange4", 0x8B5A00 }, + { "orangered", 0xff4500 }, + { "orangered1", 0xff4500 }, + { "orangered2", 0xee4000 }, + { "orangered3", 0xcd3700 }, + { "orangered4", 0x8b2500 }, + { "orchid", 0xDA70D6 }, + { "orchid1", 0xFF83FA }, + { "orchid2", 0xEE7AE9 }, + { "orchid3", 0xCD69C9 }, + { "orchid4", 0x8B4789 }, + { "palegoldenrod", 0xeee8aa }, + { "palegreen", 0x98fb98 }, + { "palegreen1", 0x9aff9a }, + { "palegreen2", 0x90ee90 }, + { "palegreen3", 0x7ccd7c }, + { "palegreen4", 0x548b54 }, + { "paleturquoise", 0xafeeee }, + { "paleturquoise1", 0xbbffff }, + { "paleturquoise2", 0xaeeeee }, + { "paleturquoise3", 0x96cdcd }, + { "paleturquoise4", 0x668b8b }, + { "palevioletred", 0xdb7093 }, + { "palevioletred1", 0xff82ab }, + { "palevioletred2", 0xee799f }, + { "palevioletred3", 0xcd6889 }, + { "palevioletred4", 0x8b475d }, + { "papayawhip", 0xffefd5 }, + { "peachpuff", 0xffdab9 }, + { "peachpuff1", 0xffdab9 }, + { "peachpuff2", 0xeecbad }, + { "peachpuff3", 0xcdaf95 }, + { "peachpuff4", 0x8b7765 }, + { "peru", 0xCD853F }, + { "pink", 0xFFC0CB }, + { "pink1", 0xFFB5C5 }, + { "pink2", 0xEEA9B8 }, + { "pink3", 0xCD919E }, + { "pink4", 0x8B636C }, + { "plum", 0xDDA0DD }, + { "plum1", 0xFFBBFF }, + { "plum2", 0xEEAEEE }, + { "plum3", 0xCD96CD }, + { "plum4", 0x8B668B }, + { "powderblue", 0xb0e0e6 }, + { "purple", 0x800080 }, + { "purple", 0xA020F0 }, + { "purple1", 0x9B30FF }, + { "purple2", 0x912CEE }, + { "purple3", 0x7D26CD }, + { "purple4", 0x551A8B }, + { "red", 0xFF0000 }, + { "red1", 0xFF0000 }, + { "red2", 0xEE0000 }, + { "red3", 0xCD0000 }, + { "red4", 0x8B0000 }, + { "rosybrown", 0xbc8f8f }, + { "rosybrown1", 0xffc1c1 }, + { "rosybrown2", 0xeeb4b4 }, + { "rosybrown3", 0xcd9b9b }, + { "rosybrown4", 0x8b6969 }, + { "royalblue", 0x4169e1 }, + { "royalblue1", 0x4876ff }, + { "royalblue2", 0x436eee }, + { "royalblue3", 0x3a5fcd }, + { "royalblue4", 0x27408b }, + { "saddlebrown", 0x8b4513 }, + { "salmon", 0xFA8072 }, + { "salmon1", 0xFF8C69 }, + { "salmon2", 0xEE8262 }, + { "salmon3", 0xCD7054 }, + { "salmon4", 0x8B4C39 }, + { "sandybrown", 0xf4a460 }, + { "seagreen", 0x2e8b57 }, + { "seagreen1", 0x54ff9f }, + { "seagreen2", 0x4eee94 }, + { "seagreen3", 0x43cd80 }, + { "seagreen4", 0x2e8b57 }, + { "seashell", 0xFFF5EE }, + { "seashell1", 0xFFF5EE }, + { "seashell2", 0xEEE5DE }, + { "seashell3", 0xCDC5BF }, + { "seashell4", 0x8B8682 }, + { "sienna", 0xA0522D }, + { "sienna1", 0xFF8247 }, + { "sienna2", 0xEE7942 }, + { "sienna3", 0xCD6839 }, + { "sienna4", 0x8B4726 }, + { "silver", 0xC0C0C0 }, + { "skyblue", 0x87ceeb }, + { "skyblue1", 0x87ceff }, + { "skyblue2", 0x7ec0ee }, + { "skyblue3", 0x6ca6cd }, + { "skyblue4", 0x4a708b }, + { "slateblue", 0x6a5acd }, + { "slateblue1", 0x836fff }, + { "slateblue2", 0x7a67ee }, + { "slateblue3", 0x6959cd }, + { "slateblue4", 0x473c8b }, + { "slategray", 0x708090 }, + { "slategray1", 0xc6e2ff }, + { "slategray2", 0xb9d3ee }, + { "slategray3", 0x9fb6cd }, + { "slategray4", 0x6c7b8b }, + { "slategrey", 0x708090 }, + { "snow", 0xFFFAFA }, + { "snow1", 0xFFFAFA }, + { "snow2", 0xEEE9E9 }, + { "snow3", 0xCDC9C9 }, + { "snow4", 0x8B8989 }, + { "springgreen", 0x00ff7f }, + { "springgreen1", 0x00ff7f }, + { "springgreen2", 0x00ee76 }, + { "springgreen3", 0x00cd66 }, + { "springgreen4", 0x008b45 }, + { "steelblue", 0x4682b4 }, + { "steelblue1", 0x63b8ff }, + { "steelblue2", 0x5cacee }, + { "steelblue3", 0x4f94cd }, + { "steelblue4", 0x36648b }, + { "tan", 0xD2B48C }, + { "tan1", 0xFFA54F }, + { "tan2", 0xEE9A49 }, + { "tan3", 0xCD853F }, + { "tan4", 0x8B5A2B }, + { "teal", 0x008080 }, + { "thistle", 0xD8BFD8 }, + { "thistle1", 0xFFE1FF }, + { "thistle2", 0xEED2EE }, + { "thistle3", 0xCDB5CD }, + { "thistle4", 0x8B7B8B }, + { "tomato", 0xFF6347 }, + { "tomato1", 0xFF6347 }, + { "tomato2", 0xEE5C42 }, + { "tomato3", 0xCD4F39 }, + { "tomato4", 0x8B3626 }, + { "transparent", 0x0000FF }, + { "turquoise", 0x40E0D0 }, + { "turquoise1", 0x00F5FF }, + { "turquoise2", 0x00E5EE }, + { "turquoise3", 0x00C5CD }, + { "turquoise4", 0x00868B }, + { "violet", 0xEE82EE }, + { "violetred", 0xd02090 }, + { "violetred1", 0xff3e96 }, + { "violetred2", 0xee3a8c }, + { "violetred3", 0xcd3278 }, + { "violetred4", 0x8b2252 }, + { "wheat", 0xF5DEB3 }, + { "wheat1", 0xFFE7BA }, + { "wheat2", 0xEED8AE }, + { "wheat3", 0xCDBA96 }, + { "wheat4", 0x8B7E66 }, + { "white", 0xFFFFFF }, + { "whitesmoke", 0xf5f5f5 }, + { "yellow", 0xFFFF00 }, + { "yellow1", 0xFFFF00 }, + { "yellow2", 0xEEEE00 }, + { "yellow3", 0xCDCD00 }, + { "yellow4", 0x8B8B00 }, + { "yellowgreen", 0x9acd32 }, +#endif /* EXTENDED_XPM_COLORS */ + {"none", 0xFFFFFF} + }; + + if(spec[0] == '#') { + char buf[7]; + switch(speclen) { + case 4: + buf[0] = buf[1] = spec[1]; + buf[2] = buf[3] = spec[2]; + buf[4] = buf[5] = spec[3]; + break; + case 7: + SDL_memcpy(buf, spec + 1, 6); + break; + case 13: + buf[0] = spec[1]; + buf[1] = spec[2]; + buf[2] = spec[5]; + buf[3] = spec[6]; + buf[4] = spec[9]; + buf[5] = spec[10]; + break; + } + buf[6] = '\0'; + *rgb = strtol(buf, NULL, 16); + return 1; + } else { + int i; + for(i = 0; i < SDL_arraysize(known); i++) + if(SDL_strncasecmp(known[i].name, spec, speclen) == 0) { + *rgb = known[i].rgb; + return 1; + } + return 0; + } +} + +#ifndef MAX +#define MAX(a, b) ((a) > (b) ? (a) : (b)) +#endif + +static char *linebuf; +static int buflen; +static char *error; + +/* + * Read next line from the source. + * If len > 0, it's assumed to be at least len chars (for efficiency). + * Return NULL and set error upon EOF or parse error. + */ +static char *get_next_line(char ***lines, SDL_RWops *src, int len) +{ + char *linebufnew; + + if(lines) { + return *(*lines)++; + } else { + char c; + int n; + do { + if(SDL_RWread(src, &c, 1, 1) <= 0) { + error = "Premature end of data"; + return NULL; + } + } while(c != '"'); + if(len) { + len += 4; /* "\",\n\0" */ + if(len > buflen){ + buflen = len; + linebufnew = (char *)SDL_realloc(linebuf, buflen); + if(!linebufnew) { + SDL_free(linebuf); + error = "Out of memory"; + return NULL; + } + linebuf = linebufnew; + } + if(SDL_RWread(src, linebuf, len - 1, 1) <= 0) { + error = "Premature end of data"; + return NULL; + } + n = len - 2; + } else { + n = 0; + do { + if(n >= buflen - 1) { + if(buflen == 0) + buflen = 16; + buflen *= 2; + linebufnew = (char *)SDL_realloc(linebuf, buflen); + if(!linebufnew) { + SDL_free(linebuf); + error = "Out of memory"; + return NULL; + } + linebuf = linebufnew; + } + if(SDL_RWread(src, linebuf + n, 1, 1) <= 0) { + error = "Premature end of data"; + return NULL; + } + } while(linebuf[n++] != '"'); + n--; + } + linebuf[n] = '\0'; + return linebuf; + } +} + +#define SKIPSPACE(p) \ +do { \ + while(SDL_isspace((unsigned char)*(p))) \ + ++(p); \ +} while(0) + +#define SKIPNONSPACE(p) \ +do { \ + while(!SDL_isspace((unsigned char)*(p)) && *p) \ + ++(p); \ +} while(0) + +/* read XPM from either array or RWops */ +static SDL_Surface *load_xpm(char **xpm, SDL_RWops *src) +{ + Sint64 start = 0; + SDL_Surface *image = NULL; + int index; + int x, y; + int w, h, ncolors, cpp; + int indexed; + Uint8 *dst; + struct color_hash *colors = NULL; + SDL_Color *im_colors = NULL; + char *keystrings = NULL, *nextkey; + char *line; + char ***xpmlines = NULL; + int pixels_len; + + error = NULL; + linebuf = NULL; + buflen = 0; + + if ( src ) + start = SDL_RWtell(src); + + if(xpm) + xpmlines = &xpm; + + line = get_next_line(xpmlines, src, 0); + if(!line) + goto done; + /* + * The header string of an XPMv3 image has the format + * + * [ ] + * + * where the hotspot coords are intended for mouse cursors. + * Right now we don't use the hotspots but it should be handled + * one day. + */ + if(SDL_sscanf(line, "%d %d %d %d", &w, &h, &ncolors, &cpp) != 4 + || w <= 0 || h <= 0 || ncolors <= 0 || cpp <= 0) { + error = "Invalid format description"; + goto done; + } + + keystrings = (char *)SDL_malloc(ncolors * cpp); + if(!keystrings) { + error = "Out of memory"; + goto done; + } + nextkey = keystrings; + + /* Create the new surface */ + if(ncolors <= 256) { + indexed = 1; + image = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 8, + 0, 0, 0, 0); + im_colors = image->format->palette->colors; + image->format->palette->ncolors = ncolors; + } else { + indexed = 0; + image = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 32, + 0xff0000, 0x00ff00, 0x0000ff, 0); + } + if(!image) { + /* Hmm, some SDL error (out of memory?) */ + goto done; + } + + /* Read the colors */ + colors = create_colorhash(ncolors); + if (!colors) { + error = "Out of memory"; + goto done; + } + for(index = 0; index < ncolors; ++index ) { + char *p; + line = get_next_line(xpmlines, src, 0); + if(!line) + goto done; + + p = line + cpp + 1; + + /* parse a colour definition */ + for(;;) { + char nametype; + char *colname; + Uint32 rgb, pixel; + + SKIPSPACE(p); + if(!*p) { + error = "colour parse error"; + goto done; + } + nametype = *p; + SKIPNONSPACE(p); + SKIPSPACE(p); + colname = p; + SKIPNONSPACE(p); + if(nametype == 's') + continue; /* skip symbolic colour names */ + + if(!color_to_rgb(colname, p - colname, &rgb)) + continue; + + SDL_memcpy(nextkey, line, cpp); + if(indexed) { + SDL_Color *c = im_colors + index; + c->r = (Uint8)(rgb >> 16); + c->g = (Uint8)(rgb >> 8); + c->b = (Uint8)(rgb); + pixel = index; + } else + pixel = rgb; + add_colorhash(colors, nextkey, cpp, pixel); + nextkey += cpp; + if(rgb == 0xffffffff) + SDL_SetColorKey(image, SDL_TRUE, pixel); + break; + } + } + + /* Read the pixels */ + pixels_len = w * cpp; + dst = (Uint8 *)image->pixels; + for(y = 0; y < h; y++) { + line = get_next_line(xpmlines, src, pixels_len); + if(indexed) { + /* optimization for some common cases */ + if(cpp == 1) + for(x = 0; x < w; x++) + dst[x] = (Uint8)QUICK_COLORHASH(colors, + line + x); + else + for(x = 0; x < w; x++) + dst[x] = (Uint8)get_colorhash(colors, + line + x * cpp, + cpp); + } else { + for (x = 0; x < w; x++) + ((Uint32*)dst)[x] = get_colorhash(colors, + line + x * cpp, + cpp); + } + dst += image->pitch; + } + +done: + if(error) { + if ( src ) + SDL_RWseek(src, start, RW_SEEK_SET); + if ( image ) { + SDL_FreeSurface(image); + image = NULL; + } + IMG_SetError(error); + } + if (keystrings) + SDL_free(keystrings); + free_colorhash(colors); + if (linebuf) + SDL_free(linebuf); + return(image); +} + +/* Load a XPM type image from an RWops datasource */ +SDL_Surface *IMG_LoadXPM_RW(SDL_RWops *src) +{ + if ( !src ) { + /* The error message has been set in SDL_RWFromFile */ + return NULL; + } + return load_xpm(NULL, src); +} + +SDL_Surface *IMG_ReadXPMFromArray(char **xpm) +{ + return load_xpm(xpm, NULL); +} + +#else /* not LOAD_XPM */ + +/* See if an image is contained in a data source */ +int IMG_isXPM(SDL_RWops *src) +{ + return(0); +} + + +/* Load a XPM type image from an SDL datasource */ +SDL_Surface *IMG_LoadXPM_RW(SDL_RWops *src) +{ + return(NULL); +} + +SDL_Surface *IMG_ReadXPMFromArray(char **xpm) +{ + return NULL; +} +#endif /* not LOAD_XPM */ diff --git a/project/jni/sdl2_image/IMG_xv.c b/project/jni/sdl2_image/IMG_xv.c new file mode 100644 index 000000000..1251f27cf --- /dev/null +++ b/project/jni/sdl2_image/IMG_xv.c @@ -0,0 +1,165 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/* This is a XV thumbnail image file loading framework */ + +#include +#include + +#include "SDL_image.h" + +#ifdef LOAD_XV + +static int get_line(SDL_RWops *src, char *line, int size) +{ + while ( size > 0 ) { + if ( SDL_RWread(src, line, 1, 1) <= 0 ) { + return -1; + } + if ( *line == '\r' ) { + continue; + } + if ( *line == '\n' ) { + *line = '\0'; + return 0; + } + ++line; + --size; + } + /* Out of space for the line */ + return -1; +} + +static int get_header(SDL_RWops *src, int *w, int *h) +{ + char line[1024]; + + *w = 0; + *h = 0; + + /* Check the header magic */ + if ( (get_line(src, line, sizeof(line)) < 0) || + (SDL_memcmp(line, "P7 332", 6) != 0) ) { + return -1; + } + + /* Read the header */ + while ( get_line(src, line, sizeof(line)) == 0 ) { + if ( SDL_memcmp(line, "#BUILTIN:", 9) == 0 ) { + /* Builtin image, no data */ + break; + } + if ( SDL_memcmp(line, "#END_OF_COMMENTS", 16) == 0 ) { + if ( get_line(src, line, sizeof(line)) == 0 ) { + SDL_sscanf(line, "%d %d", w, h); + if ( *w >= 0 && *h >= 0 ) { + return 0; + } + } + break; + } + } + /* No image data */ + return -1; +} + +/* See if an image is contained in a data source */ +int IMG_isXV(SDL_RWops *src) +{ + Sint64 start; + int is_XV; + int w, h; + + if ( !src ) + return 0; + start = SDL_RWtell(src); + is_XV = 0; + if ( get_header(src, &w, &h) == 0 ) { + is_XV = 1; + } + SDL_RWseek(src, start, RW_SEEK_SET); + return(is_XV); +} + +/* Load a XV thumbnail image from an SDL datasource */ +SDL_Surface *IMG_LoadXV_RW(SDL_RWops *src) +{ + Sint64 start; + const char *error = NULL; + SDL_Surface *surface = NULL; + int w, h; + Uint8 *pixels; + + if ( !src ) { + /* The error message has been set in SDL_RWFromFile */ + return NULL; + } + start = SDL_RWtell(src); + + /* Read the header */ + if ( get_header(src, &w, &h) < 0 ) { + error = "Unsupported image format"; + goto done; + } + + /* Create the 3-3-2 indexed palette surface */ + surface = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 8, 0xe0, 0x1c, 0x03, 0); + if ( surface == NULL ) { + error = "Out of memory"; + goto done; + } + + /* Load the image data */ + for ( pixels = (Uint8 *)surface->pixels; h > 0; --h ) { + if ( SDL_RWread(src, pixels, w, 1) <= 0 ) { + error = "Couldn't read image data"; + goto done; + } + pixels += surface->pitch; + } + +done: + if ( error ) { + SDL_RWseek(src, start, RW_SEEK_SET); + if ( surface ) { + SDL_FreeSurface(surface); + surface = NULL; + } + IMG_SetError(error); + } + return surface; +} + +#else + +/* See if an image is contained in a data source */ +int IMG_isXV(SDL_RWops *src) +{ + return(0); +} + +/* Load a XXX type image from an SDL datasource */ +SDL_Surface *IMG_LoadXV_RW(SDL_RWops *src) +{ + return(NULL); +} + +#endif /* LOAD_XV */ diff --git a/project/jni/sdl2_image/IMG_xxx.c b/project/jni/sdl2_image/IMG_xxx.c new file mode 100644 index 000000000..507950ff2 --- /dev/null +++ b/project/jni/sdl2_image/IMG_xxx.c @@ -0,0 +1,87 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/* This is a generic "format not supported" image framework */ + +#include + +#include "SDL_image.h" + +#ifdef LOAD_XXX + +/* See if an image is contained in a data source */ +int IMG_isXXX(SDL_RWops *src) +{ + int start; + int is_XXX; + + if ( !src ) + return 0; + start = SDL_RWtell(src); + is_XXX = 0; + + /* Detect the image here */ + + SDL_RWseek(src, start, RW_SEEK_SET); + return(is_XXX); +} + +/* Load a XXX type image from an SDL datasource */ +SDL_Surface *IMG_LoadXXX_RW(SDL_RWops *src) +{ + int start; + const char *error = NULL; + SDL_Surface *surface = NULL; + + if ( !src ) { + /* The error message has been set in SDL_RWFromFile */ + return NULL; + } + start = SDL_RWtell(src); + + /* Load the image here */ + + if ( error ) { + SDL_RWseek(src, start, RW_SEEK_SET); + if ( surface ) { + SDL_FreeSurface(surface); + surface = NULL; + } + IMG_SetError(error); + } + return surface; +} + +#else + +/* See if an image is contained in a data source */ +int IMG_isXXX(SDL_RWops *src) +{ + return(0); +} + +/* Load a XXX type image from an SDL datasource */ +SDL_Surface *IMG_LoadXXX_RW(SDL_RWops *src) +{ + return(NULL); +} + +#endif /* LOAD_XXX */ diff --git a/project/jni/sdl2_image/README.txt b/project/jni/sdl2_image/README.txt new file mode 100644 index 000000000..5e9b5d0b8 --- /dev/null +++ b/project/jni/sdl2_image/README.txt @@ -0,0 +1,40 @@ + +SDL_image 2.0 + +The latest version of this library is available from: +http://www.libsdl.org/projects/SDL_image/ + +This is a simple library to load images of various formats as SDL surfaces. +This library supports BMP, PNM (PPM/PGM/PBM), XPM, LBM, PCX, GIF, JPEG, PNG, +TGA, and TIFF formats. + +API: +#include "SDL_image.h" + + SDL_Surface *IMG_Load(const char *file); +or + SDL_Surface *IMG_Load_RW(SDL_RWops *src, int freesrc); +or + SDL_Surface *IMG_LoadTyped_RW(SDL_RWops *src, int freesrc, char *type); + +where type is a string specifying the format (i.e. "PNG" or "pcx"). +Note that IMG_Load_RW cannot load TGA images. + +To create a surface from an XPM image included in C source, use: + + SDL_Surface *IMG_ReadXPMFromArray(char **xpm); + +An example program 'showimage' is included, with source in showimage.c + +JPEG support requires the JPEG library: http://www.ijg.org/ +PNG support requires the PNG library: http://www.libpng.org/pub/png/libpng.html + and the Zlib library: http://www.gzip.org/zlib/ +TIFF support requires the TIFF library: ftp://ftp.sgi.com/graphics/tiff/ + +If you have these libraries installed in non-standard places, you can +try adding those paths to the configure script, e.g. +sh ./configure CPPFLAGS="-I/somewhere/include" LDFLAGS="-L/somewhere/lib" +If this works, you may need to add /somewhere/lib to your LD_LIBRARY_PATH +so shared library loading works correctly. + +This library is under the zlib License, see the file "COPYING.txt" for details. diff --git a/project/jni/sdl2_image/include/SDL b/project/jni/sdl2_image/include/SDL new file mode 120000 index 000000000..945c9b46d --- /dev/null +++ b/project/jni/sdl2_image/include/SDL @@ -0,0 +1 @@ +. \ No newline at end of file diff --git a/project/jni/sdl2_image/include/SDL_image.h b/project/jni/sdl2_image/include/SDL_image.h new file mode 100644 index 000000000..8862a12b0 --- /dev/null +++ b/project/jni/sdl2_image/include/SDL_image.h @@ -0,0 +1,145 @@ +/* + SDL_image: An example image loading library for use with SDL + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/* A simple library to load images of various formats as SDL surfaces */ + +#ifndef _SDL_IMAGE_H +#define _SDL_IMAGE_H + +#include "SDL.h" +#include "SDL_version.h" +#include "begin_code.h" + +/* Set up for C function definitions, even when using C++ */ +#ifdef __cplusplus +extern "C" { +#endif + +/* Printable format: "%d.%d.%d", MAJOR, MINOR, PATCHLEVEL +*/ +#define SDL_IMAGE_MAJOR_VERSION 2 +#define SDL_IMAGE_MINOR_VERSION 0 +#define SDL_IMAGE_PATCHLEVEL 0 + +/* This macro can be used to fill a version structure with the compile-time + * version of the SDL_image library. + */ +#define SDL_IMAGE_VERSION(X) \ +{ \ + (X)->major = SDL_IMAGE_MAJOR_VERSION; \ + (X)->minor = SDL_IMAGE_MINOR_VERSION; \ + (X)->patch = SDL_IMAGE_PATCHLEVEL; \ +} + +/* This function gets the version of the dynamically linked SDL_image library. + it should NOT be used to fill a version structure, instead you should + use the SDL_IMAGE_VERSION() macro. + */ +extern DECLSPEC const SDL_version * SDLCALL IMG_Linked_Version(void); + +typedef enum +{ + IMG_INIT_JPG = 0x00000001, + IMG_INIT_PNG = 0x00000002, + IMG_INIT_TIF = 0x00000004, + IMG_INIT_WEBP = 0x00000008 +} IMG_InitFlags; + +/* Loads dynamic libraries and prepares them for use. Flags should be + one or more flags from IMG_InitFlags OR'd together. + It returns the flags successfully initialized, or 0 on failure. + */ +extern DECLSPEC int SDLCALL IMG_Init(int flags); + +/* Unloads libraries loaded with IMG_Init */ +extern DECLSPEC void SDLCALL IMG_Quit(void); + +/* Load an image from an SDL data source. + The 'type' may be one of: "BMP", "GIF", "PNG", etc. + + If the image format supports a transparent pixel, SDL will set the + colorkey for the surface. You can enable RLE acceleration on the + surface afterwards by calling: + SDL_SetColorKey(image, SDL_RLEACCEL, image->format->colorkey); + */ +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadTyped_RW(SDL_RWops *src, int freesrc, const char *type); +/* Convenience functions */ +extern DECLSPEC SDL_Surface * SDLCALL IMG_Load(const char *file); +extern DECLSPEC SDL_Surface * SDLCALL IMG_Load_RW(SDL_RWops *src, int freesrc); + +#if SDL_VERSION_ATLEAST(2,0,0) +/* Load an image directly into a render texture. + */ +extern DECLSPEC SDL_Texture * SDLCALL IMG_LoadTexture(SDL_Renderer *renderer, const char *file); +extern DECLSPEC SDL_Texture * SDLCALL IMG_LoadTexture_RW(SDL_Renderer *renderer, SDL_RWops *src, int freesrc); +extern DECLSPEC SDL_Texture * SDLCALL IMG_LoadTextureTyped_RW(SDL_Renderer *renderer, SDL_RWops *src, int freesrc, const char *type); +#endif /* SDL 2.0 */ + +/* Functions to detect a file type, given a seekable source */ +extern DECLSPEC int SDLCALL IMG_isICO(SDL_RWops *src); +extern DECLSPEC int SDLCALL IMG_isCUR(SDL_RWops *src); +extern DECLSPEC int SDLCALL IMG_isBMP(SDL_RWops *src); +extern DECLSPEC int SDLCALL IMG_isGIF(SDL_RWops *src); +extern DECLSPEC int SDLCALL IMG_isJPG(SDL_RWops *src); +extern DECLSPEC int SDLCALL IMG_isLBM(SDL_RWops *src); +extern DECLSPEC int SDLCALL IMG_isPCX(SDL_RWops *src); +extern DECLSPEC int SDLCALL IMG_isPNG(SDL_RWops *src); +extern DECLSPEC int SDLCALL IMG_isPNM(SDL_RWops *src); +extern DECLSPEC int SDLCALL IMG_isTIF(SDL_RWops *src); +extern DECLSPEC int SDLCALL IMG_isXCF(SDL_RWops *src); +extern DECLSPEC int SDLCALL IMG_isXPM(SDL_RWops *src); +extern DECLSPEC int SDLCALL IMG_isXV(SDL_RWops *src); +extern DECLSPEC int SDLCALL IMG_isWEBP(SDL_RWops *src); + +/* Individual loading functions */ +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadICO_RW(SDL_RWops *src); +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadCUR_RW(SDL_RWops *src); +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadBMP_RW(SDL_RWops *src); +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadGIF_RW(SDL_RWops *src); +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadJPG_RW(SDL_RWops *src); +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadLBM_RW(SDL_RWops *src); +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadPCX_RW(SDL_RWops *src); +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadPNG_RW(SDL_RWops *src); +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadPNM_RW(SDL_RWops *src); +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadTGA_RW(SDL_RWops *src); +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadTIF_RW(SDL_RWops *src); +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadXCF_RW(SDL_RWops *src); +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadXPM_RW(SDL_RWops *src); +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadXV_RW(SDL_RWops *src); +extern DECLSPEC SDL_Surface * SDLCALL IMG_LoadWEBP_RW(SDL_RWops *src); + +extern DECLSPEC SDL_Surface * SDLCALL IMG_ReadXPMFromArray(char **xpm); + +/* Individual saving functions */ +extern DECLSPEC int SDLCALL IMG_SavePNG(SDL_Surface *surface, const char *file); +extern DECLSPEC int SDLCALL IMG_SavePNG_RW(SDL_Surface *surface, SDL_RWops *dst, int freedst); + +/* We'll use SDL for reporting errors */ +#define IMG_SetError SDL_SetError +#define IMG_GetError SDL_GetError + +/* Ends C function definitions when using C++ */ +#ifdef __cplusplus +} +#endif +#include "close_code.h" + +#endif /* _SDL_IMAGE_H */ diff --git a/project/jni/sdl2_image/include/miniz.h b/project/jni/sdl2_image/include/miniz.h new file mode 100644 index 000000000..ea53c2fa4 --- /dev/null +++ b/project/jni/sdl2_image/include/miniz.h @@ -0,0 +1,4771 @@ +/* miniz.c v1.14 - public domain deflate/inflate, zlib-subset, ZIP reading/writing/appending, PNG writing + See "unlicense" statement at the end of this file. + Rich Geldreich , last updated May 20, 2012 + Implements RFC 1950: http://www.ietf.org/rfc/rfc1950.txt and RFC 1951: http://www.ietf.org/rfc/rfc1951.txt + + Most API's defined in miniz.c are optional. For example, to disable the archive related functions just define + MINIZ_NO_ARCHIVE_APIS, or to get rid of all stdio usage define MINIZ_NO_STDIO (see the list below for more macros). + + * Change History + 5/20/12 v1.14 - MinGW32/64 GCC 4.6.1 compiler fixes: added MZ_FORCEINLINE, #include (thanks fermtect). + 5/19/12 v1.13 - From jason@cornsyrup.org and kelwert@mtu.edu - Fix mz_crc32() so it doesn't compute the wrong CRC-32's when mz_ulong is 64-bit. + Temporarily/locally slammed in "typedef unsigned long mz_ulong" and re-ran a randomized regression test on ~500k files. + Eliminated a bunch of warnings when compiling with GCC 32-bit/64. + Ran all examples, miniz.c, and tinfl.c through MSVC 2008's /analyze (static analysis) option and fixed all warnings (except for the silly + "Use of the comma-operator in a tested expression.." analysis warning, which I purposely use to work around a MSVC compiler warning). + Created 32-bit and 64-bit Codeblocks projects/workspace. Built and tested Linux executables. The codeblocks workspace is compatible with Linux+Win32/x64. + Added miniz_tester solution/project, which is a useful little app derived from LZHAM's tester app that I use as part of the regression test. + Ran miniz.c and tinfl.c through another series of regression testing on ~500,000 files and archives. + Modified example5.c so it purposely disables a bunch of high-level functionality (MINIZ_NO_STDIO, etc.). (Thanks to corysama for the MINIZ_NO_STDIO bug report.) + Fix ftell() usage in examples so they exit with an error on files which are too large (a limitation of the examples, not miniz itself). + 4/12/12 v1.12 - More comments, added low-level example5.c, fixed a couple minor level_and_flags issues in the archive API's. + level_and_flags can now be set to MZ_DEFAULT_COMPRESSION. Thanks to Bruce Dawson for the feedback/bug report. + 5/28/11 v1.11 - Added statement from unlicense.org + 5/27/11 v1.10 - Substantial compressor optimizations: + Level 1 is now ~4x faster than before. The L1 compressor's throughput now varies between 70-110MB/sec. on a + Core i7 (actual throughput varies depending on the type of data, and x64 vs. x86). + Improved baseline L2-L9 compression perf. Also, greatly improved compression perf. issues on some file types. + Refactored the compression code for better readability and maintainability. + Added level 10 compression level (L10 has slightly better ratio than level 9, but could have a potentially large + drop in throughput on some files). + 5/15/11 v1.09 - Initial stable release. + + * Low-level Deflate/Inflate implementation notes: + + Compression: Use the "tdefl" API's. The compressor supports raw, static, and dynamic blocks, lazy or + greedy parsing, match length filtering, RLE-only, and Huffman-only streams. It performs and compresses + approximately as well as zlib. + + Decompression: Use the "tinfl" API's. The entire decompressor is implemented as a single function + coroutine: see tinfl_decompress(). It supports decompression into a 32KB (or larger power of 2) wrapping buffer, or into a memory + block large enough to hold the entire file. + + The low-level tdefl/tinfl API's do not make any use of dynamic memory allocation. + + * zlib-style API notes: + + miniz.c implements a fairly large subset of zlib. There's enough functionality present for it to be a drop-in + zlib replacement in many apps: + The z_stream struct, optional memory allocation callbacks + deflateInit/deflateInit2/deflate/deflateReset/deflateEnd/deflateBound + inflateInit/inflateInit2/inflate/inflateEnd + compress, compress2, compressBound, uncompress + CRC-32, Adler-32 - Using modern, minimal code size, CPU cache friendly routines. + Supports raw deflate streams or standard zlib streams with adler-32 checking. + + Limitations: + The callback API's are not implemented yet. No support for gzip headers or zlib static dictionaries. + I've tried to closely emulate zlib's various flavors of stream flushing and return status codes, but + there are no guarantees that miniz.c pulls this off perfectly. + + * PNG writing: See the tdefl_write_image_to_png_file_in_memory() function, originally written by + Alex Evans. Supports 1-4 bytes/pixel images. + + * ZIP archive API notes: + + The ZIP archive API's where designed with simplicity and efficiency in mind, with just enough abstraction to + get the job done with minimal fuss. There are simple API's to retrieve file information, read files from + existing archives, create new archives, append new files to existing archives, or clone archive data from + one archive to another. It supports archives located in memory or the heap, on disk (using stdio.h), + or you can specify custom file read/write callbacks. + + - Archive reading: Just call this function to read a single file from a disk archive: + + void *mz_zip_extract_archive_file_to_heap(const char *pZip_filename, const char *pArchive_name, + size_t *pSize, mz_uint zip_flags); + + For more complex cases, use the "mz_zip_reader" functions. Upon opening an archive, the entire central + directory is located and read as-is into memory, and subsequent file access only occurs when reading individual files. + + - Archives file scanning: The simple way is to use this function to scan a loaded archive for a specific file: + + int mz_zip_reader_locate_file(mz_zip_archive *pZip, const char *pName, const char *pComment, mz_uint flags); + + The locate operation can optionally check file comments too, which (as one example) can be used to identify + multiple versions of the same file in an archive. This function uses a simple linear search through the central + directory, so it's not very fast. + + Alternately, you can iterate through all the files in an archive (using mz_zip_reader_get_num_files()) and + retrieve detailed info on each file by calling mz_zip_reader_file_stat(). + + - Archive creation: Use the "mz_zip_writer" functions. The ZIP writer immediately writes compressed file data + to disk and builds an exact image of the central directory in memory. The central directory image is written + all at once at the end of the archive file when the archive is finalized. + + The archive writer can optionally align each file's local header and file data to any power of 2 alignment, + which can be useful when the archive will be read from optical media. Also, the writer supports placing + arbitrary data blobs at the very beginning of ZIP archives. Archives written using either feature are still + readable by any ZIP tool. + + - Archive appending: The simple way to add a single file to an archive is to call this function: + + mz_bool mz_zip_add_mem_to_archive_file_in_place(const char *pZip_filename, const char *pArchive_name, + const void *pBuf, size_t buf_size, const void *pComment, mz_uint16 comment_size, mz_uint level_and_flags); + + The archive will be created if it doesn't already exist, otherwise it'll be appended to. + Note the appending is done in-place and is not an atomic operation, so if something goes wrong + during the operation it's possible the archive could be left without a central directory (although the local + file headers and file data will be fine, so the archive will be recoverable). + + For more complex archive modification scenarios: + 1. The safest way is to use a mz_zip_reader to read the existing archive, cloning only those bits you want to + preserve into a new archive using using the mz_zip_writer_add_from_zip_reader() function (which compiles the + compressed file data as-is). When you're done, delete the old archive and rename the newly written archive, and + you're done. This is safe but requires a bunch of temporary disk space or heap memory. + + 2. Or, you can convert an mz_zip_reader in-place to an mz_zip_writer using mz_zip_writer_init_from_reader(), + append new files as needed, then finalize the archive which will write an updated central directory to the + original archive. (This is basically what mz_zip_add_mem_to_archive_file_in_place() does.) There's a + possibility that the archive's central directory could be lost with this method if anything goes wrong, though. + + - ZIP archive support limitations: + No zip64 or spanning support. Extraction functions can only handle unencrypted, stored or deflated files. + Requires streams capable of seeking. + + * This is a header file library, like stb_image.c. To get only a header file, either cut and paste the + below header, or create miniz.h, #define MINIZ_HEADER_FILE_ONLY, and then include miniz.c from it. + + * Important: For best perf. be sure to customize the below macros for your target platform: + #define MINIZ_USE_UNALIGNED_LOADS_AND_STORES 1 + #define MINIZ_LITTLE_ENDIAN 1 + #define MINIZ_HAS_64BIT_REGISTERS 1 +*/ + +#ifndef MINIZ_HEADER_INCLUDED +#define MINIZ_HEADER_INCLUDED + +#include + +#if !defined(MINIZ_NO_TIME) && !defined(MINIZ_NO_ARCHIVE_APIS) +#include +#endif + +// Defines to completely disable specific portions of miniz.c: +// If all macros here are defined the only functionality remaining will be CRC-32, adler-32, tinfl, and tdefl. + +// Define MINIZ_NO_STDIO to disable all usage and any functions which rely on stdio for file I/O. +#define MINIZ_NO_STDIO + +// If MINIZ_NO_TIME is specified then the ZIP archive functions will not be able to get the current time, or +// get/set file times. +#define MINIZ_NO_TIME + +// Define MINIZ_NO_ARCHIVE_APIS to disable all ZIP archive API's. +#define MINIZ_NO_ARCHIVE_APIS + +// Define MINIZ_NO_ARCHIVE_APIS to disable all writing related ZIP archive API's. +#define MINIZ_NO_ARCHIVE_WRITING_APIS + +// Define MINIZ_NO_ZLIB_APIS to remove all ZLIB-style compression/decompression API's. +#define MINIZ_NO_ZLIB_APIS + +// Define MINIZ_NO_ZLIB_COMPATIBLE_NAME to disable zlib names, to prevent conflicts against stock zlib. +#define MINIZ_NO_ZLIB_COMPATIBLE_NAMES + +// Define MINIZ_NO_MALLOC to disable all calls to malloc, free, and realloc. +// Note if MINIZ_NO_MALLOC is defined then the user must always provide custom user alloc/free/realloc +// callbacks to the zlib and archive API's, and a few stand-alone helper API's which don't provide custom user +// functions (such as tdefl_compress_mem_to_heap() and tinfl_decompress_mem_to_heap()) won't work. +//#define MINIZ_NO_MALLOC +#define MINIZ_SDL_MALLOC + +#if defined(_M_IX86) || defined(_M_X64) || defined(__i386__) || defined(__i386) || defined(__i486__) || defined(__i486) || defined(i386) || defined(__ia64__) || defined(__x86_64__) +// MINIZ_X86_OR_X64_CPU is only used to help set the below macros. +#define MINIZ_X86_OR_X64_CPU 1 +#endif + +#if (__BYTE_ORDER__==__ORDER_LITTLE_ENDIAN__) || MINIZ_X86_OR_X64_CPU +// Set MINIZ_LITTLE_ENDIAN to 1 if the processor is little endian. +#define MINIZ_LITTLE_ENDIAN 1 +#endif + +#if MINIZ_X86_OR_X64_CPU +// Set MINIZ_USE_UNALIGNED_LOADS_AND_STORES to 1 on CPU's that permit efficient integer loads and stores from unaligned addresses. +#define MINIZ_USE_UNALIGNED_LOADS_AND_STORES 1 +#endif + +#if defined(_M_X64) || defined(_WIN64) || defined(__MINGW64__) || defined(_LP64) || defined(__LP64__) || defined(__ia64__) || defined(__x86_64__) +// Set MINIZ_HAS_64BIT_REGISTERS to 1 if operations on 64-bit integers are reasonably fast (and don't involve compiler generated calls to helper functions). +#define MINIZ_HAS_64BIT_REGISTERS 1 +#endif + +#ifdef __cplusplus +extern "C" { +#endif + +// ------------------- zlib-style API Definitions. + +// For more compatibility with zlib, miniz.c uses unsigned long for some parameters/struct members. Beware: mz_ulong can be either 32 or 64-bits! +typedef unsigned long mz_ulong; + +// Heap allocation callbacks. +// Note that mz_alloc_func parameter types purpsosely differ from zlib's: items/size is size_t, not unsigned long. +typedef void *(*mz_alloc_func)(void *opaque, size_t items, size_t size); +typedef void (*mz_free_func)(void *opaque, void *address); +typedef void *(*mz_realloc_func)(void *opaque, void *address, size_t items, size_t size); + +#define MZ_ADLER32_INIT (1) +// mz_adler32() returns the initial adler-32 value to use when called with ptr==NULL. +mz_ulong mz_adler32(mz_ulong adler, const unsigned char *ptr, size_t buf_len); + +#define MZ_CRC32_INIT (0) +// mz_crc32() returns the initial CRC-32 value to use when called with ptr==NULL. +mz_ulong mz_crc32(mz_ulong crc, const unsigned char *ptr, size_t buf_len); + +// Compression strategies. +enum { MZ_DEFAULT_STRATEGY = 0, MZ_FILTERED = 1, MZ_HUFFMAN_ONLY = 2, MZ_RLE = 3, MZ_FIXED = 4 }; + +// Method +#define MZ_DEFLATED 8 + +#ifndef MINIZ_NO_ZLIB_APIS + +#define MZ_VERSION "9.1.14" +#define MZ_VERNUM 0x91E0 +#define MZ_VER_MAJOR 9 +#define MZ_VER_MINOR 1 +#define MZ_VER_REVISION 14 +#define MZ_VER_SUBREVISION 0 + +// Flush values. For typical usage you only need MZ_NO_FLUSH and MZ_FINISH. The other values are for advanced use (refer to the zlib docs). +enum { MZ_NO_FLUSH = 0, MZ_PARTIAL_FLUSH = 1, MZ_SYNC_FLUSH = 2, MZ_FULL_FLUSH = 3, MZ_FINISH = 4, MZ_BLOCK = 5 }; + +// Return status codes. MZ_PARAM_ERROR is non-standard. +enum { MZ_OK = 0, MZ_STREAM_END = 1, MZ_NEED_DICT = 2, MZ_ERRNO = -1, MZ_STREAM_ERROR = -2, MZ_DATA_ERROR = -3, MZ_MEM_ERROR = -4, MZ_BUF_ERROR = -5, MZ_VERSION_ERROR = -6, MZ_PARAM_ERROR = -10000 }; + +// Compression levels: 0-9 are the standard zlib-style levels, 10 is best possible compression (not zlib compatible, and may be very slow), MZ_DEFAULT_COMPRESSION=MZ_DEFAULT_LEVEL. +enum { MZ_NO_COMPRESSION = 0, MZ_BEST_SPEED = 1, MZ_BEST_COMPRESSION = 9, MZ_UBER_COMPRESSION = 10, MZ_DEFAULT_LEVEL = 6, MZ_DEFAULT_COMPRESSION = -1 }; + +// Window bits +#define MZ_DEFAULT_WINDOW_BITS 15 + +struct mz_internal_state; + +// Compression/decompression stream struct. +typedef struct mz_stream_s +{ + const unsigned char *next_in; // pointer to next byte to read + unsigned int avail_in; // number of bytes available at next_in + mz_ulong total_in; // total number of bytes consumed so far + + unsigned char *next_out; // pointer to next byte to write + unsigned int avail_out; // number of bytes that can be written to next_out + mz_ulong total_out; // total number of bytes produced so far + + char *msg; // error msg (unused) + struct mz_internal_state *state; // internal state, allocated by zalloc/zfree + + mz_alloc_func zalloc; // optional heap allocation function (defaults to malloc) + mz_free_func zfree; // optional heap free function (defaults to free) + void *opaque; // heap alloc function user pointer + + int data_type; // data_type (unused) + mz_ulong adler; // adler32 of the source or uncompressed data + mz_ulong reserved; // not used +} mz_stream; + +typedef mz_stream *mz_streamp; + +// Returns the version string of miniz.c. +const char *mz_version(void); + +// mz_deflateInit() initializes a compressor with default options: +// Parameters: +// pStream must point to an initialized mz_stream struct. +// level must be between [MZ_NO_COMPRESSION, MZ_BEST_COMPRESSION]. +// level 1 enables a specially optimized compression function that's been optimized purely for performance, not ratio. +// (This special func. is currently only enabled when MINIZ_USE_UNALIGNED_LOADS_AND_STORES and MINIZ_LITTLE_ENDIAN are defined.) +// Return values: +// MZ_OK on success. +// MZ_STREAM_ERROR if the stream is bogus. +// MZ_PARAM_ERROR if the input parameters are bogus. +// MZ_MEM_ERROR on out of memory. +int mz_deflateInit(mz_streamp pStream, int level); + +// mz_deflateInit2() is like mz_deflate(), except with more control: +// Additional parameters: +// method must be MZ_DEFLATED +// window_bits must be MZ_DEFAULT_WINDOW_BITS (to wrap the deflate stream with zlib header/adler-32 footer) or -MZ_DEFAULT_WINDOW_BITS (raw deflate/no header or footer) +// mem_level must be between [1, 9] (it's checked but ignored by miniz.c) +int mz_deflateInit2(mz_streamp pStream, int level, int method, int window_bits, int mem_level, int strategy); + +// Quickly resets a compressor without having to reallocate anything. Same as calling mz_deflateEnd() followed by mz_deflateInit()/mz_deflateInit2(). +int mz_deflateReset(mz_streamp pStream); + +// mz_deflate() compresses the input to output, consuming as much of the input and producing as much output as possible. +// Parameters: +// pStream is the stream to read from and write to. You must initialize/update the next_in, avail_in, next_out, and avail_out members. +// flush may be MZ_NO_FLUSH, MZ_PARTIAL_FLUSH/MZ_SYNC_FLUSH, MZ_FULL_FLUSH, or MZ_FINISH. +// Return values: +// MZ_OK on success (when flushing, or if more input is needed but not available, and/or there's more output to be written but the output buffer is full). +// MZ_STREAM_END if all input has been consumed and all output bytes have been written. Don't call mz_deflate() on the stream anymore. +// MZ_STREAM_ERROR if the stream is bogus. +// MZ_PARAM_ERROR if one of the parameters is invalid. +// MZ_BUF_ERROR if no forward progress is possible because the input and/or output buffers are empty. (Fill up the input buffer or free up some output space and try again.) +int mz_deflate(mz_streamp pStream, int flush); + +// mz_deflateEnd() deinitializes a compressor: +// Return values: +// MZ_OK on success. +// MZ_STREAM_ERROR if the stream is bogus. +int mz_deflateEnd(mz_streamp pStream); + +// mz_deflateBound() returns a (very) conservative upper bound on the amount of data that could be generated by deflate(), assuming flush is set to only MZ_NO_FLUSH or MZ_FINISH. +mz_ulong mz_deflateBound(mz_streamp pStream, mz_ulong source_len); + +// Single-call compression functions mz_compress() and mz_compress2(): +// Returns MZ_OK on success, or one of the error codes from mz_deflate() on failure. +int mz_compress(unsigned char *pDest, mz_ulong *pDest_len, const unsigned char *pSource, mz_ulong source_len); +int mz_compress2(unsigned char *pDest, mz_ulong *pDest_len, const unsigned char *pSource, mz_ulong source_len, int level); + +// mz_compressBound() returns a (very) conservative upper bound on the amount of data that could be generated by calling mz_compress(). +mz_ulong mz_compressBound(mz_ulong source_len); + +// Initializes a decompressor. +int mz_inflateInit(mz_streamp pStream); + +// mz_inflateInit2() is like mz_inflateInit() with an additional option that controls the window size and whether or not the stream has been wrapped with a zlib header/footer: +// window_bits must be MZ_DEFAULT_WINDOW_BITS (to parse zlib header/footer) or -MZ_DEFAULT_WINDOW_BITS (raw deflate). +int mz_inflateInit2(mz_streamp pStream, int window_bits); + +// Decompresses the input stream to the output, consuming only as much of the input as needed, and writing as much to the output as possible. +// Parameters: +// pStream is the stream to read from and write to. You must initialize/update the next_in, avail_in, next_out, and avail_out members. +// flush may be MZ_NO_FLUSH, MZ_SYNC_FLUSH, or MZ_FINISH. +// On the first call, if flush is MZ_FINISH it's assumed the input and output buffers are both sized large enough to decompress the entire stream in a single call (this is slightly faster). +// MZ_FINISH implies that there are no more source bytes available beside what's already in the input buffer, and that the output buffer is large enough to hold the rest of the decompressed data. +// Return values: +// MZ_OK on success. Either more input is needed but not available, and/or there's more output to be written but the output buffer is full. +// MZ_STREAM_END if all needed input has been consumed and all output bytes have been written. For zlib streams, the adler-32 of the decompressed data has also been verified. +// MZ_STREAM_ERROR if the stream is bogus. +// MZ_DATA_ERROR if the deflate stream is invalid. +// MZ_PARAM_ERROR if one of the parameters is invalid. +// MZ_BUF_ERROR if no forward progress is possible because the input buffer is empty but the inflater needs more input to continue, or if the output buffer is not large enough. Call mz_inflate() again +// with more input data, or with more room in the output buffer (except when using single call decompression, described above). +int mz_inflate(mz_streamp pStream, int flush); + +// Deinitializes a decompressor. +int mz_inflateEnd(mz_streamp pStream); + +// Single-call decompression. +// Returns MZ_OK on success, or one of the error codes from mz_inflate() on failure. +int mz_uncompress(unsigned char *pDest, mz_ulong *pDest_len, const unsigned char *pSource, mz_ulong source_len); + +// Returns a string description of the specified error code, or NULL if the error code is invalid. +const char *mz_error(int err); + +// Redefine zlib-compatible names to miniz equivalents, so miniz.c can be used as a drop-in replacement for the subset of zlib that miniz.c supports. +// Define MINIZ_NO_ZLIB_COMPATIBLE_NAMES to disable zlib-compatibility if you use zlib in the same project. +#ifndef MINIZ_NO_ZLIB_COMPATIBLE_NAMES + typedef unsigned char Byte; + typedef unsigned int uInt; + typedef mz_ulong uLong; + typedef Byte Bytef; + typedef uInt uIntf; + typedef char charf; + typedef int intf; + typedef void *voidpf; + typedef uLong uLongf; + typedef void *voidp; + typedef void *const voidpc; + #define Z_NULL 0 + #define Z_NO_FLUSH MZ_NO_FLUSH + #define Z_PARTIAL_FLUSH MZ_PARTIAL_FLUSH + #define Z_SYNC_FLUSH MZ_SYNC_FLUSH + #define Z_FULL_FLUSH MZ_FULL_FLUSH + #define Z_FINISH MZ_FINISH + #define Z_BLOCK MZ_BLOCK + #define Z_OK MZ_OK + #define Z_STREAM_END MZ_STREAM_END + #define Z_NEED_DICT MZ_NEED_DICT + #define Z_ERRNO MZ_ERRNO + #define Z_STREAM_ERROR MZ_STREAM_ERROR + #define Z_DATA_ERROR MZ_DATA_ERROR + #define Z_MEM_ERROR MZ_MEM_ERROR + #define Z_BUF_ERROR MZ_BUF_ERROR + #define Z_VERSION_ERROR MZ_VERSION_ERROR + #define Z_PARAM_ERROR MZ_PARAM_ERROR + #define Z_NO_COMPRESSION MZ_NO_COMPRESSION + #define Z_BEST_SPEED MZ_BEST_SPEED + #define Z_BEST_COMPRESSION MZ_BEST_COMPRESSION + #define Z_DEFAULT_COMPRESSION MZ_DEFAULT_COMPRESSION + #define Z_DEFAULT_STRATEGY MZ_DEFAULT_STRATEGY + #define Z_FILTERED MZ_FILTERED + #define Z_HUFFMAN_ONLY MZ_HUFFMAN_ONLY + #define Z_RLE MZ_RLE + #define Z_FIXED MZ_FIXED + #define Z_DEFLATED MZ_DEFLATED + #define Z_DEFAULT_WINDOW_BITS MZ_DEFAULT_WINDOW_BITS + #define alloc_func mz_alloc_func + #define free_func mz_free_func + #define internal_state mz_internal_state + #define z_stream mz_stream + #define deflateInit mz_deflateInit + #define deflateInit2 mz_deflateInit2 + #define deflateReset mz_deflateReset + #define deflate mz_deflate + #define deflateEnd mz_deflateEnd + #define deflateBound mz_deflateBound + #define compress mz_compress + #define compress2 mz_compress2 + #define compressBound mz_compressBound + #define inflateInit mz_inflateInit + #define inflateInit2 mz_inflateInit2 + #define inflate mz_inflate + #define inflateEnd mz_inflateEnd + #define uncompress mz_uncompress + #define crc32 mz_crc32 + #define adler32 mz_adler32 + #define MAX_WBITS 15 + #define MAX_MEM_LEVEL 9 + #define zError mz_error + #define ZLIB_VERSION MZ_VERSION + #define ZLIB_VERNUM MZ_VERNUM + #define ZLIB_VER_MAJOR MZ_VER_MAJOR + #define ZLIB_VER_MINOR MZ_VER_MINOR + #define ZLIB_VER_REVISION MZ_VER_REVISION + #define ZLIB_VER_SUBREVISION MZ_VER_SUBREVISION + #define zlibVersion mz_version + #define zlib_version mz_version() +#endif // #ifndef MINIZ_NO_ZLIB_COMPATIBLE_NAMES + +#endif // MINIZ_NO_ZLIB_APIS + +// ------------------- Types and macros + +typedef unsigned char mz_uint8; +typedef signed short mz_int16; +typedef unsigned short mz_uint16; +typedef unsigned int mz_uint32; +typedef unsigned int mz_uint; +typedef long long mz_int64; +typedef unsigned long long mz_uint64; +typedef int mz_bool; + +#define MZ_FALSE (0) +#define MZ_TRUE (1) + +// Works around MSVC's spammy "warning C4127: conditional expression is constant" message. +#ifdef _MSC_VER + #define MZ_MACRO_END while (0, 0) +#else + #define MZ_MACRO_END while (0) +#endif + +// ------------------- ZIP archive reading/writing + +#ifndef MINIZ_NO_ARCHIVE_APIS + +enum +{ + MZ_ZIP_MAX_IO_BUF_SIZE = 64*1024, + MZ_ZIP_MAX_ARCHIVE_FILENAME_SIZE = 260, + MZ_ZIP_MAX_ARCHIVE_FILE_COMMENT_SIZE = 256 +}; + +typedef struct +{ + mz_uint32 m_file_index; + mz_uint32 m_central_dir_ofs; + mz_uint16 m_version_made_by; + mz_uint16 m_version_needed; + mz_uint16 m_bit_flag; + mz_uint16 m_method; +#ifndef MINIZ_NO_TIME + time_t m_time; +#endif + mz_uint32 m_crc32; + mz_uint64 m_comp_size; + mz_uint64 m_uncomp_size; + mz_uint16 m_internal_attr; + mz_uint32 m_external_attr; + mz_uint64 m_local_header_ofs; + mz_uint32 m_comment_size; + char m_filename[MZ_ZIP_MAX_ARCHIVE_FILENAME_SIZE]; + char m_comment[MZ_ZIP_MAX_ARCHIVE_FILE_COMMENT_SIZE]; +} mz_zip_archive_file_stat; + +typedef size_t (*mz_file_read_func)(void *pOpaque, mz_uint64 file_ofs, void *pBuf, size_t n); +typedef size_t (*mz_file_write_func)(void *pOpaque, mz_uint64 file_ofs, const void *pBuf, size_t n); + +struct mz_zip_internal_state_tag; +typedef struct mz_zip_internal_state_tag mz_zip_internal_state; + +typedef enum +{ + MZ_ZIP_MODE_INVALID = 0, + MZ_ZIP_MODE_READING = 1, + MZ_ZIP_MODE_WRITING = 2, + MZ_ZIP_MODE_WRITING_HAS_BEEN_FINALIZED = 3 +} mz_zip_mode; + +typedef struct +{ + mz_uint64 m_archive_size; + mz_uint64 m_central_directory_file_ofs; + mz_uint m_total_files; + mz_zip_mode m_zip_mode; + + mz_uint m_file_offset_alignment; + + mz_alloc_func m_pAlloc; + mz_free_func m_pFree; + mz_realloc_func m_pRealloc; + void *m_pAlloc_opaque; + + mz_file_read_func m_pRead; + mz_file_write_func m_pWrite; + void *m_pIO_opaque; + + mz_zip_internal_state *m_pState; + +} mz_zip_archive; + +typedef enum +{ + MZ_ZIP_FLAG_CASE_SENSITIVE = 0x0100, + MZ_ZIP_FLAG_IGNORE_PATH = 0x0200, + MZ_ZIP_FLAG_COMPRESSED_DATA = 0x0400, + MZ_ZIP_FLAG_DO_NOT_SORT_CENTRAL_DIRECTORY = 0x0800 +} mz_zip_flags; + +// ZIP archive reading + +// Inits a ZIP archive reader. +// These functions read and validate the archive's central directory. +mz_bool mz_zip_reader_init(mz_zip_archive *pZip, mz_uint64 size, mz_uint32 flags); +mz_bool mz_zip_reader_init_mem(mz_zip_archive *pZip, const void *pMem, size_t size, mz_uint32 flags); + +#ifndef MINIZ_NO_STDIO +mz_bool mz_zip_reader_init_file(mz_zip_archive *pZip, const char *pFilename, mz_uint32 flags); +#endif + +// Returns the total number of files in the archive. +mz_uint mz_zip_reader_get_num_files(mz_zip_archive *pZip); + +// Returns detailed information about an archive file entry. +mz_bool mz_zip_reader_file_stat(mz_zip_archive *pZip, mz_uint file_index, mz_zip_archive_file_stat *pStat); + +// Determines if an archive file entry is a directory entry. +mz_bool mz_zip_reader_is_file_a_directory(mz_zip_archive *pZip, mz_uint file_index); +mz_bool mz_zip_reader_is_file_encrypted(mz_zip_archive *pZip, mz_uint file_index); + +// Retrieves the filename of an archive file entry. +// Returns the number of bytes written to pFilename, or if filename_buf_size is 0 this function returns the number of bytes needed to fully store the filename. +mz_uint mz_zip_reader_get_filename(mz_zip_archive *pZip, mz_uint file_index, char *pFilename, mz_uint filename_buf_size); + +// Attempts to locates a file in the archive's central directory. +// Valid flags: MZ_ZIP_FLAG_CASE_SENSITIVE, MZ_ZIP_FLAG_IGNORE_PATH +// Returns -1 if the file cannot be found. +int mz_zip_reader_locate_file(mz_zip_archive *pZip, const char *pName, const char *pComment, mz_uint flags); + +// Extracts a archive file to a memory buffer using no memory allocation. +mz_bool mz_zip_reader_extract_to_mem_no_alloc(mz_zip_archive *pZip, mz_uint file_index, void *pBuf, size_t buf_size, mz_uint flags, void *pUser_read_buf, size_t user_read_buf_size); +mz_bool mz_zip_reader_extract_file_to_mem_no_alloc(mz_zip_archive *pZip, const char *pFilename, void *pBuf, size_t buf_size, mz_uint flags, void *pUser_read_buf, size_t user_read_buf_size); + +// Extracts a archive file to a memory buffer. +mz_bool mz_zip_reader_extract_to_mem(mz_zip_archive *pZip, mz_uint file_index, void *pBuf, size_t buf_size, mz_uint flags); +mz_bool mz_zip_reader_extract_file_to_mem(mz_zip_archive *pZip, const char *pFilename, void *pBuf, size_t buf_size, mz_uint flags); + +// Extracts a archive file to a dynamically allocated heap buffer. +void *mz_zip_reader_extract_to_heap(mz_zip_archive *pZip, mz_uint file_index, size_t *pSize, mz_uint flags); +void *mz_zip_reader_extract_file_to_heap(mz_zip_archive *pZip, const char *pFilename, size_t *pSize, mz_uint flags); + +// Extracts a archive file using a callback function to output the file's data. +mz_bool mz_zip_reader_extract_to_callback(mz_zip_archive *pZip, mz_uint file_index, mz_file_write_func pCallback, void *pOpaque, mz_uint flags); +mz_bool mz_zip_reader_extract_file_to_callback(mz_zip_archive *pZip, const char *pFilename, mz_file_write_func pCallback, void *pOpaque, mz_uint flags); + +#ifndef MINIZ_NO_STDIO +// Extracts a archive file to a disk file and sets its last accessed and modified times. +// This function only extracts files, not archive directory records. +mz_bool mz_zip_reader_extract_to_file(mz_zip_archive *pZip, mz_uint file_index, const char *pDst_filename, mz_uint flags); +mz_bool mz_zip_reader_extract_file_to_file(mz_zip_archive *pZip, const char *pArchive_filename, const char *pDst_filename, mz_uint flags); +#endif + +// Ends archive reading, freeing all allocations, and closing the input archive file if mz_zip_reader_init_file() was used. +mz_bool mz_zip_reader_end(mz_zip_archive *pZip); + +// ZIP archive writing + +#ifndef MINIZ_NO_ARCHIVE_WRITING_APIS + +// Inits a ZIP archive writer. +mz_bool mz_zip_writer_init(mz_zip_archive *pZip, mz_uint64 existing_size); +mz_bool mz_zip_writer_init_heap(mz_zip_archive *pZip, size_t size_to_reserve_at_beginning, size_t initial_allocation_size); + +#ifndef MINIZ_NO_STDIO +mz_bool mz_zip_writer_init_file(mz_zip_archive *pZip, const char *pFilename, mz_uint64 size_to_reserve_at_beginning); +#endif + +// Converts a ZIP archive reader object into a writer object, to allow efficient in-place file appends to occur on an existing archive. +// For archives opened using mz_zip_reader_init_file, pFilename must be the archive's filename so it can be reopened for writing. If the file can't be reopened, mz_zip_reader_end() will be called. +// For archives opened using mz_zip_reader_init_mem, the memory block must be growable using the realloc callback (which defaults to realloc unless you've overridden it). +// Finally, for archives opened using mz_zip_reader_init, the mz_zip_archive's user provided m_pWrite function cannot be NULL. +// Note: In-place archive modification is not recommended unless you know what you're doing, because if execution stops or something goes wrong before +// the archive is finalized the file's central directory will be hosed. +mz_bool mz_zip_writer_init_from_reader(mz_zip_archive *pZip, const char *pFilename); + +// Adds the contents of a memory buffer to an archive. These functions record the current local time into the archive. +// To add a directory entry, call this method with an archive name ending in a forwardslash with empty buffer. +// level_and_flags - compression level (0-10, see MZ_BEST_SPEED, MZ_BEST_COMPRESSION, etc.) logically OR'd with zero or more mz_zip_flags, or just set to MZ_DEFAULT_COMPRESSION. +mz_bool mz_zip_writer_add_mem(mz_zip_archive *pZip, const char *pArchive_name, const void *pBuf, size_t buf_size, mz_uint level_and_flags); +mz_bool mz_zip_writer_add_mem_ex(mz_zip_archive *pZip, const char *pArchive_name, const void *pBuf, size_t buf_size, const void *pComment, mz_uint16 comment_size, mz_uint level_and_flags, mz_uint64 uncomp_size, mz_uint32 uncomp_crc32); + +#ifndef MINIZ_NO_STDIO +// Adds the contents of a disk file to an archive. This function also records the disk file's modified time into the archive. +// level_and_flags - compression level (0-10, see MZ_BEST_SPEED, MZ_BEST_COMPRESSION, etc.) logically OR'd with zero or more mz_zip_flags, or just set to MZ_DEFAULT_COMPRESSION. +mz_bool mz_zip_writer_add_file(mz_zip_archive *pZip, const char *pArchive_name, const char *pSrc_filename, const void *pComment, mz_uint16 comment_size, mz_uint level_and_flags); +#endif + +// Adds a file to an archive by fully cloning the data from another archive. +// This function fully clones the source file's compressed data (no recompression), along with its full filename, extra data, and comment fields. +mz_bool mz_zip_writer_add_from_zip_reader(mz_zip_archive *pZip, mz_zip_archive *pSource_zip, mz_uint file_index); + +// Finalizes the archive by writing the central directory records followed by the end of central directory record. +// After an archive is finalized, the only valid call on the mz_zip_archive struct is mz_zip_writer_end(). +// An archive must be manually finalized by calling this function for it to be valid. +mz_bool mz_zip_writer_finalize_archive(mz_zip_archive *pZip); +mz_bool mz_zip_writer_finalize_heap_archive(mz_zip_archive *pZip, void **pBuf, size_t *pSize); + +// Ends archive writing, freeing all allocations, and closing the output file if mz_zip_writer_init_file() was used. +// Note for the archive to be valid, it must have been finalized before ending. +mz_bool mz_zip_writer_end(mz_zip_archive *pZip); + +// Misc. high-level helper functions: + +// mz_zip_add_mem_to_archive_file_in_place() efficiently (but not atomically) appends a memory blob to a ZIP archive. +// level_and_flags - compression level (0-10, see MZ_BEST_SPEED, MZ_BEST_COMPRESSION, etc.) logically OR'd with zero or more mz_zip_flags, or just set to MZ_DEFAULT_COMPRESSION. +mz_bool mz_zip_add_mem_to_archive_file_in_place(const char *pZip_filename, const char *pArchive_name, const void *pBuf, size_t buf_size, const void *pComment, mz_uint16 comment_size, mz_uint level_and_flags); + +// Reads a single file from an archive into a heap block. +// Returns NULL on failure. +void *mz_zip_extract_archive_file_to_heap(const char *pZip_filename, const char *pArchive_name, size_t *pSize, mz_uint zip_flags); + +#endif // #ifndef MINIZ_NO_ARCHIVE_WRITING_APIS + +#endif // #ifndef MINIZ_NO_ARCHIVE_APIS + +// ------------------- Low-level Decompression API Definitions + +// Decompression flags used by tinfl_decompress(). +// TINFL_FLAG_PARSE_ZLIB_HEADER: If set, the input has a valid zlib header and ends with an adler32 checksum (it's a valid zlib stream). Otherwise, the input is a raw deflate stream. +// TINFL_FLAG_HAS_MORE_INPUT: If set, there are more input bytes available beyond the end of the supplied input buffer. If clear, the input buffer contains all remaining input. +// TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF: If set, the output buffer is large enough to hold the entire decompressed stream. If clear, the output buffer is at least the size of the dictionary (typically 32KB). +// TINFL_FLAG_COMPUTE_ADLER32: Force adler-32 checksum computation of the decompressed bytes. +enum +{ + TINFL_FLAG_PARSE_ZLIB_HEADER = 1, + TINFL_FLAG_HAS_MORE_INPUT = 2, + TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF = 4, + TINFL_FLAG_COMPUTE_ADLER32 = 8 +}; + +// High level decompression functions: +// tinfl_decompress_mem_to_heap() decompresses a block in memory to a heap block allocated via malloc(). +// On entry: +// pSrc_buf, src_buf_len: Pointer and size of the Deflate or zlib source data to decompress. +// On return: +// Function returns a pointer to the decompressed data, or NULL on failure. +// *pOut_len will be set to the decompressed data's size, which could be larger than src_buf_len on uncompressible data. +// The caller must free() the returned block when it's no longer needed. +void *tinfl_decompress_mem_to_heap(const void *pSrc_buf, size_t src_buf_len, size_t *pOut_len, int flags); + +// tinfl_decompress_mem_to_mem() decompresses a block in memory to another block in memory. +// Returns TINFL_DECOMPRESS_MEM_TO_MEM_FAILED on failure, or the number of bytes written on success. +#define TINFL_DECOMPRESS_MEM_TO_MEM_FAILED ((size_t)(-1)) +size_t tinfl_decompress_mem_to_mem(void *pOut_buf, size_t out_buf_len, const void *pSrc_buf, size_t src_buf_len, int flags); + +// tinfl_decompress_mem_to_callback() decompresses a block in memory to an internal 32KB buffer, and a user provided callback function will be called to flush the buffer. +// Returns 1 on success or 0 on failure. +typedef int (*tinfl_put_buf_func_ptr)(const void* pBuf, int len, void *pUser); +int tinfl_decompress_mem_to_callback(const void *pIn_buf, size_t *pIn_buf_size, tinfl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags); + +struct tinfl_decompressor_tag; typedef struct tinfl_decompressor_tag tinfl_decompressor; + +// Max size of LZ dictionary. +#define TINFL_LZ_DICT_SIZE 32768 + +// Return status. +typedef enum +{ + TINFL_STATUS_BAD_PARAM = -3, + TINFL_STATUS_ADLER32_MISMATCH = -2, + TINFL_STATUS_FAILED = -1, + TINFL_STATUS_DONE = 0, + TINFL_STATUS_NEEDS_MORE_INPUT = 1, + TINFL_STATUS_HAS_MORE_OUTPUT = 2 +} tinfl_status; + +// Initializes the decompressor to its initial state. +#define tinfl_init(r) do { (r)->m_state = 0; } MZ_MACRO_END +#define tinfl_get_adler32(r) (r)->m_check_adler32 + +// Main low-level decompressor coroutine function. This is the only function actually needed for decompression. All the other functions are just high-level helpers for improved usability. +// This is a universal API, i.e. it can be used as a building block to build any desired higher level decompression API. In the limit case, it can be called once per every byte input or output. +tinfl_status tinfl_decompress(tinfl_decompressor *r, const mz_uint8 *pIn_buf_next, size_t *pIn_buf_size, mz_uint8 *pOut_buf_start, mz_uint8 *pOut_buf_next, size_t *pOut_buf_size, const mz_uint32 decomp_flags); + +// Internal/private bits follow. +enum +{ + TINFL_MAX_HUFF_TABLES = 3, TINFL_MAX_HUFF_SYMBOLS_0 = 288, TINFL_MAX_HUFF_SYMBOLS_1 = 32, TINFL_MAX_HUFF_SYMBOLS_2 = 19, + TINFL_FAST_LOOKUP_BITS = 10, TINFL_FAST_LOOKUP_SIZE = 1 << TINFL_FAST_LOOKUP_BITS +}; + +typedef struct +{ + mz_uint8 m_code_size[TINFL_MAX_HUFF_SYMBOLS_0]; + mz_int16 m_look_up[TINFL_FAST_LOOKUP_SIZE], m_tree[TINFL_MAX_HUFF_SYMBOLS_0 * 2]; +} tinfl_huff_table; + +#if MINIZ_HAS_64BIT_REGISTERS + #define TINFL_USE_64BIT_BITBUF 1 +#endif + +#if TINFL_USE_64BIT_BITBUF + typedef mz_uint64 tinfl_bit_buf_t; + #define TINFL_BITBUF_SIZE (64) +#else + typedef mz_uint32 tinfl_bit_buf_t; + #define TINFL_BITBUF_SIZE (32) +#endif + +struct tinfl_decompressor_tag +{ + mz_uint32 m_state, m_num_bits, m_zhdr0, m_zhdr1, m_z_adler32, m_final, m_type, m_check_adler32, m_dist, m_counter, m_num_extra, m_table_sizes[TINFL_MAX_HUFF_TABLES]; + tinfl_bit_buf_t m_bit_buf; + size_t m_dist_from_out_buf_start; + tinfl_huff_table m_tables[TINFL_MAX_HUFF_TABLES]; + mz_uint8 m_raw_header[4], m_len_codes[TINFL_MAX_HUFF_SYMBOLS_0 + TINFL_MAX_HUFF_SYMBOLS_1 + 137]; +}; + +// ------------------- Low-level Compression API Definitions + +// Set TDEFL_LESS_MEMORY to 1 to use less memory (compression will be slightly slower, and raw/dynamic blocks will be output more frequently). +#define TDEFL_LESS_MEMORY 0 + +// tdefl_init() compression flags logically OR'd together (low 12 bits contain the max. number of probes per dictionary search): +// TDEFL_DEFAULT_MAX_PROBES: The compressor defaults to 128 dictionary probes per dictionary search. 0=Huffman only, 1=Huffman+LZ (fastest/crap compression), 4095=Huffman+LZ (slowest/best compression). +enum +{ + TDEFL_HUFFMAN_ONLY = 0, TDEFL_DEFAULT_MAX_PROBES = 128, TDEFL_MAX_PROBES_MASK = 0xFFF +}; + +// TDEFL_WRITE_ZLIB_HEADER: If set, the compressor outputs a zlib header before the deflate data, and the Adler-32 of the source data at the end. Otherwise, you'll get raw deflate data. +// TDEFL_COMPUTE_ADLER32: Always compute the adler-32 of the input data (even when not writing zlib headers). +// TDEFL_GREEDY_PARSING_FLAG: Set to use faster greedy parsing, instead of more efficient lazy parsing. +// TDEFL_NONDETERMINISTIC_PARSING_FLAG: Enable to decrease the compressor's initialization time to the minimum, but the output may vary from run to run given the same input (depending on the contents of memory). +// TDEFL_RLE_MATCHES: Only look for RLE matches (matches with a distance of 1) +// TDEFL_FILTER_MATCHES: Discards matches <= 5 chars if enabled. +// TDEFL_FORCE_ALL_STATIC_BLOCKS: Disable usage of optimized Huffman tables. +// TDEFL_FORCE_ALL_RAW_BLOCKS: Only use raw (uncompressed) deflate blocks. +enum +{ + TDEFL_WRITE_ZLIB_HEADER = 0x01000, + TDEFL_COMPUTE_ADLER32 = 0x02000, + TDEFL_GREEDY_PARSING_FLAG = 0x04000, + TDEFL_NONDETERMINISTIC_PARSING_FLAG = 0x08000, + TDEFL_RLE_MATCHES = 0x10000, + TDEFL_FILTER_MATCHES = 0x20000, + TDEFL_FORCE_ALL_STATIC_BLOCKS = 0x40000, + TDEFL_FORCE_ALL_RAW_BLOCKS = 0x80000 +}; + +// High level compression functions: +// tdefl_compress_mem_to_heap() compresses a block in memory to a heap block allocated via malloc(). +// On entry: +// pSrc_buf, src_buf_len: Pointer and size of source block to compress. +// flags: The max match finder probes (default is 128) logically OR'd against the above flags. Higher probes are slower but improve compression. +// On return: +// Function returns a pointer to the compressed data, or NULL on failure. +// *pOut_len will be set to the compressed data's size, which could be larger than src_buf_len on uncompressible data. +// The caller must free() the returned block when it's no longer needed. +void *tdefl_compress_mem_to_heap(const void *pSrc_buf, size_t src_buf_len, size_t *pOut_len, int flags); + +// tdefl_compress_mem_to_mem() compresses a block in memory to another block in memory. +// Returns 0 on failure. +size_t tdefl_compress_mem_to_mem(void *pOut_buf, size_t out_buf_len, const void *pSrc_buf, size_t src_buf_len, int flags); + +// Compresses an image to a compressed PNG file in memory. +// On entry: +// pImage, w, h, and num_chans describe the image to compress. num_chans may be 1, 2, 3, or 4. +// On return: +// Function returns a pointer to the compressed data, or NULL on failure. +// *pLen_out will be set to the size of the PNG image file. +// The caller must free() the returned heap block (which will typically be larger than *pLen_out) when it's no longer needed. +void *tdefl_write_image_to_png_file_in_memory(const void *pImage, int w, int h, int bpl, int num_chans, size_t *pLen_out); + +// Output stream interface. The compressor uses this interface to write compressed data. It'll typically be called TDEFL_OUT_BUF_SIZE at a time. +typedef mz_bool (*tdefl_put_buf_func_ptr)(const void* pBuf, int len, void *pUser); + +// tdefl_compress_mem_to_output() compresses a block to an output stream. The above helpers use this function internally. +mz_bool tdefl_compress_mem_to_output(const void *pBuf, size_t buf_len, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags); + +enum { TDEFL_MAX_HUFF_TABLES = 3, TDEFL_MAX_HUFF_SYMBOLS_0 = 288, TDEFL_MAX_HUFF_SYMBOLS_1 = 32, TDEFL_MAX_HUFF_SYMBOLS_2 = 19, TDEFL_LZ_DICT_SIZE = 32768, TDEFL_LZ_DICT_SIZE_MASK = TDEFL_LZ_DICT_SIZE - 1, TDEFL_MIN_MATCH_LEN = 3, TDEFL_MAX_MATCH_LEN = 258 }; + +// TDEFL_OUT_BUF_SIZE MUST be large enough to hold a single entire compressed output block (using static/fixed Huffman codes). +#if TDEFL_LESS_MEMORY +enum { TDEFL_LZ_CODE_BUF_SIZE = 24 * 1024, TDEFL_OUT_BUF_SIZE = (TDEFL_LZ_CODE_BUF_SIZE * 13 ) / 10, TDEFL_MAX_HUFF_SYMBOLS = 288, TDEFL_LZ_HASH_BITS = 12, TDEFL_LEVEL1_HASH_SIZE_MASK = 4095, TDEFL_LZ_HASH_SHIFT = (TDEFL_LZ_HASH_BITS + 2) / 3, TDEFL_LZ_HASH_SIZE = 1 << TDEFL_LZ_HASH_BITS }; +#else +enum { TDEFL_LZ_CODE_BUF_SIZE = 64 * 1024, TDEFL_OUT_BUF_SIZE = (TDEFL_LZ_CODE_BUF_SIZE * 13 ) / 10, TDEFL_MAX_HUFF_SYMBOLS = 288, TDEFL_LZ_HASH_BITS = 15, TDEFL_LEVEL1_HASH_SIZE_MASK = 4095, TDEFL_LZ_HASH_SHIFT = (TDEFL_LZ_HASH_BITS + 2) / 3, TDEFL_LZ_HASH_SIZE = 1 << TDEFL_LZ_HASH_BITS }; +#endif + +// The low-level tdefl functions below may be used directly if the above helper functions aren't flexible enough. The low-level functions don't make any heap allocations, unlike the above helper functions. +typedef enum +{ + TDEFL_STATUS_BAD_PARAM = -2, + TDEFL_STATUS_PUT_BUF_FAILED = -1, + TDEFL_STATUS_OKAY = 0, + TDEFL_STATUS_DONE = 1, +} tdefl_status; + +// Must map to MZ_NO_FLUSH, MZ_SYNC_FLUSH, etc. enums +typedef enum +{ + TDEFL_NO_FLUSH = 0, + TDEFL_SYNC_FLUSH = 2, + TDEFL_FULL_FLUSH = 3, + TDEFL_FINISH = 4 +} tdefl_flush; + +// tdefl's compression state structure. +typedef struct +{ + tdefl_put_buf_func_ptr m_pPut_buf_func; + void *m_pPut_buf_user; + mz_uint m_flags, m_max_probes[2]; + int m_greedy_parsing; + mz_uint m_adler32, m_lookahead_pos, m_lookahead_size, m_dict_size; + mz_uint8 *m_pLZ_code_buf, *m_pLZ_flags, *m_pOutput_buf, *m_pOutput_buf_end; + mz_uint m_num_flags_left, m_total_lz_bytes, m_lz_code_buf_dict_pos, m_bits_in, m_bit_buffer; + mz_uint m_saved_match_dist, m_saved_match_len, m_saved_lit, m_output_flush_ofs, m_output_flush_remaining, m_finished, m_block_index, m_wants_to_finish; + tdefl_status m_prev_return_status; + const void *m_pIn_buf; + void *m_pOut_buf; + size_t *m_pIn_buf_size, *m_pOut_buf_size; + tdefl_flush m_flush; + const mz_uint8 *m_pSrc; + size_t m_src_buf_left, m_out_buf_ofs; + mz_uint8 m_dict[TDEFL_LZ_DICT_SIZE + TDEFL_MAX_MATCH_LEN - 1]; + mz_uint16 m_huff_count[TDEFL_MAX_HUFF_TABLES][TDEFL_MAX_HUFF_SYMBOLS]; + mz_uint16 m_huff_codes[TDEFL_MAX_HUFF_TABLES][TDEFL_MAX_HUFF_SYMBOLS]; + mz_uint8 m_huff_code_sizes[TDEFL_MAX_HUFF_TABLES][TDEFL_MAX_HUFF_SYMBOLS]; + mz_uint8 m_lz_code_buf[TDEFL_LZ_CODE_BUF_SIZE]; + mz_uint16 m_next[TDEFL_LZ_DICT_SIZE]; + mz_uint16 m_hash[TDEFL_LZ_HASH_SIZE]; + mz_uint8 m_output_buf[TDEFL_OUT_BUF_SIZE]; +} tdefl_compressor; + +// Initializes the compressor. +// There is no corresponding deinit() function because the tdefl API's do not dynamically allocate memory. +// pBut_buf_func: If NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression. +// If pBut_buf_func is NULL the user should always call the tdefl_compress() API. +// flags: See the above enums (TDEFL_HUFFMAN_ONLY, TDEFL_WRITE_ZLIB_HEADER, etc.) +tdefl_status tdefl_init(tdefl_compressor *d, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags); + +// Compresses a block of data, consuming as much of the specified input buffer as possible, and writing as much compressed data to the specified output buffer as possible. +tdefl_status tdefl_compress(tdefl_compressor *d, const void *pIn_buf, size_t *pIn_buf_size, void *pOut_buf, size_t *pOut_buf_size, tdefl_flush flush); + +// tdefl_compress_buffer() is only usable when the tdefl_init() is called with a non-NULL tdefl_put_buf_func_ptr. +// tdefl_compress_buffer() always consumes the entire input buffer. +tdefl_status tdefl_compress_buffer(tdefl_compressor *d, const void *pIn_buf, size_t in_buf_size, tdefl_flush flush); + +tdefl_status tdefl_get_prev_return_status(tdefl_compressor *d); +mz_uint32 tdefl_get_adler32(tdefl_compressor *d); + +// Can't use tdefl_create_comp_flags_from_zip_params if MINIZ_NO_ZLIB_APIS isn't defined, because it uses some of its macros. +#ifndef MINIZ_NO_ZLIB_APIS +// Create tdefl_compress() flags given zlib-style compression parameters. +// level may range from [0,10] (where 10 is absolute max compression, but may be much slower on some files) +// window_bits may be -15 (raw deflate) or 15 (zlib) +// strategy may be either MZ_DEFAULT_STRATEGY, MZ_FILTERED, MZ_HUFFMAN_ONLY, MZ_RLE, or MZ_FIXED +mz_uint tdefl_create_comp_flags_from_zip_params(int level, int window_bits, int strategy); +#endif // #ifndef MINIZ_NO_ZLIB_APIS + +#ifdef __cplusplus +} +#endif + +#endif // MINIZ_HEADER_INCLUDED + +// ------------------- End of Header: Implementation follows. (If you only want the header, define MINIZ_HEADER_FILE_ONLY.) + +#ifndef MINIZ_HEADER_FILE_ONLY + +typedef unsigned char mz_validate_uint16[sizeof(mz_uint16)==2 ? 1 : -1]; +typedef unsigned char mz_validate_uint32[sizeof(mz_uint32)==4 ? 1 : -1]; +typedef unsigned char mz_validate_uint64[sizeof(mz_uint64)==8 ? 1 : -1]; + +#include +#include + +#define MZ_ASSERT(x) assert(x) + +#ifdef MINIZ_NO_MALLOC + #define MZ_MALLOC(x) NULL + #define MZ_FREE(x) (void)x, ((void)0) + #define MZ_REALLOC(p, x) NULL +#elif defined(MINIZ_SDL_MALLOC) + #define MZ_MALLOC(x) SDL_malloc(x) + #define MZ_FREE(x) SDL_free(x) + #define MZ_REALLOC(p, x) SDL_realloc(p, x) +#else + #define MZ_MALLOC(x) malloc(x) + #define MZ_FREE(x) free(x) + #define MZ_REALLOC(p, x) realloc(p, x) +#endif + +#define MZ_MAX(a,b) (((a)>(b))?(a):(b)) +#define MZ_MIN(a,b) (((a)<(b))?(a):(b)) +#define MZ_CLEAR_OBJ(obj) memset(&(obj), 0, sizeof(obj)) + +#if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN + #define MZ_READ_LE16(p) *((const mz_uint16 *)(p)) + #define MZ_READ_LE32(p) *((const mz_uint32 *)(p)) +#else + #define MZ_READ_LE16(p) ((mz_uint32)(((const mz_uint8 *)(p))[0]) | ((mz_uint32)(((const mz_uint8 *)(p))[1]) << 8U)) + #define MZ_READ_LE32(p) ((mz_uint32)(((const mz_uint8 *)(p))[0]) | ((mz_uint32)(((const mz_uint8 *)(p))[1]) << 8U) | ((mz_uint32)(((const mz_uint8 *)(p))[2]) << 16U) | ((mz_uint32)(((const mz_uint8 *)(p))[3]) << 24U)) +#endif + +#ifdef _MSC_VER + #define MZ_FORCEINLINE __forceinline +#elif defined(__GNUC__) + #define MZ_FORCEINLINE __attribute__((__always_inline__)) +#else + #define MZ_FORCEINLINE inline +#endif + +#ifdef __cplusplus + extern "C" { +#endif + +// ------------------- zlib-style API's + +mz_ulong mz_adler32(mz_ulong adler, const unsigned char *ptr, size_t buf_len) +{ + mz_uint32 i, s1 = (mz_uint32)(adler & 0xffff), s2 = (mz_uint32)(adler >> 16); size_t block_len = buf_len % 5552; + if (!ptr) return MZ_ADLER32_INIT; + while (buf_len) { + for (i = 0; i + 7 < block_len; i += 8, ptr += 8) { + s1 += ptr[0], s2 += s1; s1 += ptr[1], s2 += s1; s1 += ptr[2], s2 += s1; s1 += ptr[3], s2 += s1; + s1 += ptr[4], s2 += s1; s1 += ptr[5], s2 += s1; s1 += ptr[6], s2 += s1; s1 += ptr[7], s2 += s1; + } + for ( ; i < block_len; ++i) s1 += *ptr++, s2 += s1; + s1 %= 65521U, s2 %= 65521U; buf_len -= block_len; block_len = 5552; + } + return (s2 << 16) + s1; +} + +// Karl Malbrain's compact CRC-32. See "A compact CCITT crc16 and crc32 C implementation that balances processor cache usage against speed": http://www.geocities.com/malbrain/ +mz_ulong mz_crc32(mz_ulong crc, const mz_uint8 *ptr, size_t buf_len) +{ + static const mz_uint32 s_crc32[16] = { 0, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, + 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c }; + mz_uint32 crcu32 = (mz_uint32)crc; + if (!ptr) return MZ_CRC32_INIT; + crcu32 = ~crcu32; while (buf_len--) { mz_uint8 b = *ptr++; crcu32 = (crcu32 >> 4) ^ s_crc32[(crcu32 & 0xF) ^ (b & 0xF)]; crcu32 = (crcu32 >> 4) ^ s_crc32[(crcu32 & 0xF) ^ (b >> 4)]; } + return ~crcu32; +} + +#ifndef MINIZ_NO_ZLIB_APIS + +static void *def_alloc_func(void *opaque, size_t items, size_t size) { (void)opaque, (void)items, (void)size; return MZ_MALLOC(items * size); } +static void def_free_func(void *opaque, void *address) { (void)opaque, (void)address; MZ_FREE(address); } +static void *def_realloc_func(void *opaque, void *address, size_t items, size_t size) { (void)opaque, (void)address, (void)items, (void)size; return MZ_REALLOC(address, items * size); } + +const char *mz_version(void) +{ + return MZ_VERSION; +} + +int mz_deflateInit(mz_streamp pStream, int level) +{ + return mz_deflateInit2(pStream, level, MZ_DEFLATED, MZ_DEFAULT_WINDOW_BITS, 9, MZ_DEFAULT_STRATEGY); +} + +int mz_deflateInit2(mz_streamp pStream, int level, int method, int window_bits, int mem_level, int strategy) +{ + tdefl_compressor *pComp; + mz_uint comp_flags = TDEFL_COMPUTE_ADLER32 | tdefl_create_comp_flags_from_zip_params(level, window_bits, strategy); + + if (!pStream) return MZ_STREAM_ERROR; + if ((method != MZ_DEFLATED) || ((mem_level < 1) || (mem_level > 9)) || ((window_bits != MZ_DEFAULT_WINDOW_BITS) && (-window_bits != MZ_DEFAULT_WINDOW_BITS))) return MZ_PARAM_ERROR; + + pStream->data_type = 0; + pStream->adler = MZ_ADLER32_INIT; + pStream->msg = NULL; + pStream->reserved = 0; + pStream->total_in = 0; + pStream->total_out = 0; + if (!pStream->zalloc) pStream->zalloc = def_alloc_func; + if (!pStream->zfree) pStream->zfree = def_free_func; + + pComp = (tdefl_compressor *)pStream->zalloc(pStream->opaque, 1, sizeof(tdefl_compressor)); + if (!pComp) + return MZ_MEM_ERROR; + + pStream->state = (struct mz_internal_state *)pComp; + + if (tdefl_init(pComp, NULL, NULL, comp_flags) != TDEFL_STATUS_OKAY) + { + mz_deflateEnd(pStream); + return MZ_PARAM_ERROR; + } + + return MZ_OK; +} + +int mz_deflateReset(mz_streamp pStream) +{ + if ((!pStream) || (!pStream->state) || (!pStream->zalloc) || (!pStream->zfree)) return MZ_STREAM_ERROR; + pStream->total_in = pStream->total_out = 0; + tdefl_init((tdefl_compressor*)pStream->state, NULL, NULL, ((tdefl_compressor*)pStream->state)->m_flags); + return MZ_OK; +} + +int mz_deflate(mz_streamp pStream, int flush) +{ + size_t in_bytes, out_bytes; + mz_ulong orig_total_in, orig_total_out; + int mz_status = MZ_OK; + + if ((!pStream) || (!pStream->state) || (flush < 0) || (flush > MZ_FINISH) || (!pStream->next_out)) return MZ_STREAM_ERROR; + if (!pStream->avail_out) return MZ_BUF_ERROR; + + if (flush == MZ_PARTIAL_FLUSH) flush = MZ_SYNC_FLUSH; + + if (((tdefl_compressor*)pStream->state)->m_prev_return_status == TDEFL_STATUS_DONE) + return (flush == MZ_FINISH) ? MZ_STREAM_END : MZ_BUF_ERROR; + + orig_total_in = pStream->total_in; orig_total_out = pStream->total_out; + for ( ; ; ) + { + tdefl_status defl_status; + in_bytes = pStream->avail_in; out_bytes = pStream->avail_out; + + defl_status = tdefl_compress((tdefl_compressor*)pStream->state, pStream->next_in, &in_bytes, pStream->next_out, &out_bytes, (tdefl_flush)flush); + pStream->next_in += (mz_uint)in_bytes; pStream->avail_in -= (mz_uint)in_bytes; + pStream->total_in += (mz_uint)in_bytes; pStream->adler = tdefl_get_adler32((tdefl_compressor*)pStream->state); + + pStream->next_out += (mz_uint)out_bytes; pStream->avail_out -= (mz_uint)out_bytes; + pStream->total_out += (mz_uint)out_bytes; + + if (defl_status < 0) + { + mz_status = MZ_STREAM_ERROR; + break; + } + else if (defl_status == TDEFL_STATUS_DONE) + { + mz_status = MZ_STREAM_END; + break; + } + else if (!pStream->avail_out) + break; + else if ((!pStream->avail_in) && (flush != MZ_FINISH)) + { + if ((flush) || (pStream->total_in != orig_total_in) || (pStream->total_out != orig_total_out)) + break; + return MZ_BUF_ERROR; // Can't make forward progress without some input. + } + } + return mz_status; +} + +int mz_deflateEnd(mz_streamp pStream) +{ + if (!pStream) return MZ_STREAM_ERROR; + if (pStream->state) + { + pStream->zfree(pStream->opaque, pStream->state); + pStream->state = NULL; + } + return MZ_OK; +} + +mz_ulong mz_deflateBound(mz_streamp pStream, mz_ulong source_len) +{ + (void)pStream; + // This is really over conservative. (And lame, but it's actually pretty tricky to compute a true upper bound given the way tdefl's blocking works.) + return MZ_MAX(128 + (source_len * 110) / 100, 128 + source_len + ((source_len / (31 * 1024)) + 1) * 5); +} + +int mz_compress2(unsigned char *pDest, mz_ulong *pDest_len, const unsigned char *pSource, mz_ulong source_len, int level) +{ + int status; + mz_stream stream; + memset(&stream, 0, sizeof(stream)); + + // In case mz_ulong is 64-bits (argh I hate longs). + if ((source_len | *pDest_len) > 0xFFFFFFFFU) return MZ_PARAM_ERROR; + + stream.next_in = pSource; + stream.avail_in = (mz_uint32)source_len; + stream.next_out = pDest; + stream.avail_out = (mz_uint32)*pDest_len; + + status = mz_deflateInit(&stream, level); + if (status != MZ_OK) return status; + + status = mz_deflate(&stream, MZ_FINISH); + if (status != MZ_STREAM_END) + { + mz_deflateEnd(&stream); + return (status == MZ_OK) ? MZ_BUF_ERROR : status; + } + + *pDest_len = stream.total_out; + return mz_deflateEnd(&stream); +} + +int mz_compress(unsigned char *pDest, mz_ulong *pDest_len, const unsigned char *pSource, mz_ulong source_len) +{ + return mz_compress2(pDest, pDest_len, pSource, source_len, MZ_DEFAULT_COMPRESSION); +} + +mz_ulong mz_compressBound(mz_ulong source_len) +{ + return mz_deflateBound(NULL, source_len); +} + +typedef struct +{ + tinfl_decompressor m_decomp; + mz_uint m_dict_ofs, m_dict_avail, m_first_call, m_has_flushed; int m_window_bits; + mz_uint8 m_dict[TINFL_LZ_DICT_SIZE]; + tinfl_status m_last_status; +} inflate_state; + +int mz_inflateInit2(mz_streamp pStream, int window_bits) +{ + inflate_state *pDecomp; + if (!pStream) return MZ_STREAM_ERROR; + if ((window_bits != MZ_DEFAULT_WINDOW_BITS) && (-window_bits != MZ_DEFAULT_WINDOW_BITS)) return MZ_PARAM_ERROR; + + pStream->data_type = 0; + pStream->adler = 0; + pStream->msg = NULL; + pStream->total_in = 0; + pStream->total_out = 0; + pStream->reserved = 0; + if (!pStream->zalloc) pStream->zalloc = def_alloc_func; + if (!pStream->zfree) pStream->zfree = def_free_func; + + pDecomp = (inflate_state*)pStream->zalloc(pStream->opaque, 1, sizeof(inflate_state)); + if (!pDecomp) return MZ_MEM_ERROR; + + pStream->state = (struct mz_internal_state *)pDecomp; + + tinfl_init(&pDecomp->m_decomp); + pDecomp->m_dict_ofs = 0; + pDecomp->m_dict_avail = 0; + pDecomp->m_last_status = TINFL_STATUS_NEEDS_MORE_INPUT; + pDecomp->m_first_call = 1; + pDecomp->m_has_flushed = 0; + pDecomp->m_window_bits = window_bits; + + return MZ_OK; +} + +int mz_inflateInit(mz_streamp pStream) +{ + return mz_inflateInit2(pStream, MZ_DEFAULT_WINDOW_BITS); +} + +int mz_inflate(mz_streamp pStream, int flush) +{ + inflate_state* pState; + mz_uint n, first_call, decomp_flags = TINFL_FLAG_COMPUTE_ADLER32; + size_t in_bytes, out_bytes, orig_avail_in; + tinfl_status status; + + if ((!pStream) || (!pStream->state)) return MZ_STREAM_ERROR; + if (flush == MZ_PARTIAL_FLUSH) flush = MZ_SYNC_FLUSH; + if ((flush) && (flush != MZ_SYNC_FLUSH) && (flush != MZ_FINISH)) return MZ_STREAM_ERROR; + + pState = (inflate_state*)pStream->state; + if (pState->m_window_bits > 0) decomp_flags |= TINFL_FLAG_PARSE_ZLIB_HEADER; + orig_avail_in = pStream->avail_in; + + first_call = pState->m_first_call; pState->m_first_call = 0; + if (pState->m_last_status < 0) return MZ_DATA_ERROR; + + if (pState->m_has_flushed && (flush != MZ_FINISH)) return MZ_STREAM_ERROR; + pState->m_has_flushed |= (flush == MZ_FINISH); + + if ((flush == MZ_FINISH) && (first_call)) + { + // MZ_FINISH on the first call implies that the input and output buffers are large enough to hold the entire compressed/decompressed file. + decomp_flags |= TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF; + in_bytes = pStream->avail_in; out_bytes = pStream->avail_out; + status = tinfl_decompress(&pState->m_decomp, pStream->next_in, &in_bytes, pStream->next_out, pStream->next_out, &out_bytes, decomp_flags); + pState->m_last_status = status; + pStream->next_in += (mz_uint)in_bytes; pStream->avail_in -= (mz_uint)in_bytes; pStream->total_in += (mz_uint)in_bytes; + pStream->adler = tinfl_get_adler32(&pState->m_decomp); + pStream->next_out += (mz_uint)out_bytes; pStream->avail_out -= (mz_uint)out_bytes; pStream->total_out += (mz_uint)out_bytes; + + if (status < 0) + return MZ_DATA_ERROR; + else if (status != TINFL_STATUS_DONE) + { + pState->m_last_status = TINFL_STATUS_FAILED; + return MZ_BUF_ERROR; + } + return MZ_STREAM_END; + } + // flush != MZ_FINISH then we must assume there's more input. + if (flush != MZ_FINISH) decomp_flags |= TINFL_FLAG_HAS_MORE_INPUT; + + if (pState->m_dict_avail) + { + n = MZ_MIN(pState->m_dict_avail, pStream->avail_out); + memcpy(pStream->next_out, pState->m_dict + pState->m_dict_ofs, n); + pStream->next_out += n; pStream->avail_out -= n; pStream->total_out += n; + pState->m_dict_avail -= n; pState->m_dict_ofs = (pState->m_dict_ofs + n) & (TINFL_LZ_DICT_SIZE - 1); + return ((pState->m_last_status == TINFL_STATUS_DONE) && (!pState->m_dict_avail)) ? MZ_STREAM_END : MZ_OK; + } + + for ( ; ; ) + { + in_bytes = pStream->avail_in; + out_bytes = TINFL_LZ_DICT_SIZE - pState->m_dict_ofs; + + status = tinfl_decompress(&pState->m_decomp, pStream->next_in, &in_bytes, pState->m_dict, pState->m_dict + pState->m_dict_ofs, &out_bytes, decomp_flags); + pState->m_last_status = status; + + pStream->next_in += (mz_uint)in_bytes; pStream->avail_in -= (mz_uint)in_bytes; + pStream->total_in += (mz_uint)in_bytes; pStream->adler = tinfl_get_adler32(&pState->m_decomp); + + pState->m_dict_avail = (mz_uint)out_bytes; + + n = MZ_MIN(pState->m_dict_avail, pStream->avail_out); + memcpy(pStream->next_out, pState->m_dict + pState->m_dict_ofs, n); + pStream->next_out += n; pStream->avail_out -= n; pStream->total_out += n; + pState->m_dict_avail -= n; pState->m_dict_ofs = (pState->m_dict_ofs + n) & (TINFL_LZ_DICT_SIZE - 1); + + if (status < 0) + return MZ_DATA_ERROR; // Stream is corrupted (there could be some uncompressed data left in the output dictionary - oh well). + else if ((status == TINFL_STATUS_NEEDS_MORE_INPUT) && (!orig_avail_in)) + return MZ_BUF_ERROR; // Signal caller that we can't make forward progress without supplying more input or by setting flush to MZ_FINISH. + else if (flush == MZ_FINISH) + { + // The output buffer MUST be large to hold the remaining uncompressed data when flush==MZ_FINISH. + if (status == TINFL_STATUS_DONE) + return pState->m_dict_avail ? MZ_BUF_ERROR : MZ_STREAM_END; + // status here must be TINFL_STATUS_HAS_MORE_OUTPUT, which means there's at least 1 more byte on the way. If there's no more room left in the output buffer then something is wrong. + else if (!pStream->avail_out) + return MZ_BUF_ERROR; + } + else if ((status == TINFL_STATUS_DONE) || (!pStream->avail_in) || (!pStream->avail_out) || (pState->m_dict_avail)) + break; + } + + return ((status == TINFL_STATUS_DONE) && (!pState->m_dict_avail)) ? MZ_STREAM_END : MZ_OK; +} + +int mz_inflateEnd(mz_streamp pStream) +{ + if (!pStream) + return MZ_STREAM_ERROR; + if (pStream->state) + { + pStream->zfree(pStream->opaque, pStream->state); + pStream->state = NULL; + } + return MZ_OK; +} + +int mz_uncompress(unsigned char *pDest, mz_ulong *pDest_len, const unsigned char *pSource, mz_ulong source_len) +{ + mz_stream stream; + int status; + memset(&stream, 0, sizeof(stream)); + + // In case mz_ulong is 64-bits (argh I hate longs). + if ((source_len | *pDest_len) > 0xFFFFFFFFU) return MZ_PARAM_ERROR; + + stream.next_in = pSource; + stream.avail_in = (mz_uint32)source_len; + stream.next_out = pDest; + stream.avail_out = (mz_uint32)*pDest_len; + + status = mz_inflateInit(&stream); + if (status != MZ_OK) + return status; + + status = mz_inflate(&stream, MZ_FINISH); + if (status != MZ_STREAM_END) + { + mz_inflateEnd(&stream); + return ((status == MZ_BUF_ERROR) && (!stream.avail_in)) ? MZ_DATA_ERROR : status; + } + *pDest_len = stream.total_out; + + return mz_inflateEnd(&stream); +} + +const char *mz_error(int err) +{ + static struct { int m_err; const char *m_pDesc; } s_error_descs[] = + { + { MZ_OK, "" }, { MZ_STREAM_END, "stream end" }, { MZ_NEED_DICT, "need dictionary" }, { MZ_ERRNO, "file error" }, { MZ_STREAM_ERROR, "stream error" }, + { MZ_DATA_ERROR, "data error" }, { MZ_MEM_ERROR, "out of memory" }, { MZ_BUF_ERROR, "buf error" }, { MZ_VERSION_ERROR, "version error" }, { MZ_PARAM_ERROR, "parameter error" } + }; + mz_uint i; for (i = 0; i < sizeof(s_error_descs) / sizeof(s_error_descs[0]); ++i) if (s_error_descs[i].m_err == err) return s_error_descs[i].m_pDesc; + return NULL; +} + +#endif //MINIZ_NO_ZLIB_APIS + +// ------------------- Low-level Decompression (completely independent from all compression API's) + +#define TINFL_MEMCPY(d, s, l) memcpy(d, s, l) +#define TINFL_MEMSET(p, c, l) memset(p, c, l) + +#define TINFL_CR_BEGIN switch(r->m_state) { case 0: +#define TINFL_CR_RETURN(state_index, result) do { status = result; r->m_state = state_index; goto common_exit; case state_index:; } MZ_MACRO_END +#define TINFL_CR_RETURN_FOREVER(state_index, result) do { for ( ; ; ) { TINFL_CR_RETURN(state_index, result); } } MZ_MACRO_END +#define TINFL_CR_FINISH } + +// TODO: If the caller has indicated that there's no more input, and we attempt to read beyond the input buf, then something is wrong with the input because the inflator never +// reads ahead more than it needs to. Currently TINFL_GET_BYTE() pads the end of the stream with 0's in this scenario. +#define TINFL_GET_BYTE(state_index, c) do { \ + if (pIn_buf_cur >= pIn_buf_end) { \ + for ( ; ; ) { \ + if (decomp_flags & TINFL_FLAG_HAS_MORE_INPUT) { \ + TINFL_CR_RETURN(state_index, TINFL_STATUS_NEEDS_MORE_INPUT); \ + if (pIn_buf_cur < pIn_buf_end) { \ + c = *pIn_buf_cur++; \ + break; \ + } \ + } else { \ + c = 0; \ + break; \ + } \ + } \ + } else c = *pIn_buf_cur++; } MZ_MACRO_END + +#define TINFL_NEED_BITS(state_index, n) do { mz_uint c; TINFL_GET_BYTE(state_index, c); bit_buf |= (((tinfl_bit_buf_t)c) << num_bits); num_bits += 8; } while (num_bits < (mz_uint)(n)) +#define TINFL_SKIP_BITS(state_index, n) do { if (num_bits < (mz_uint)(n)) { TINFL_NEED_BITS(state_index, n); } bit_buf >>= (n); num_bits -= (n); } MZ_MACRO_END +#define TINFL_GET_BITS(state_index, b, n) do { if (num_bits < (mz_uint)(n)) { TINFL_NEED_BITS(state_index, n); } b = bit_buf & ((1 << (n)) - 1); bit_buf >>= (n); num_bits -= (n); } MZ_MACRO_END + +// TINFL_HUFF_BITBUF_FILL() is only used rarely, when the number of bytes remaining in the input buffer falls below 2. +// It reads just enough bytes from the input stream that are needed to decode the next Huffman code (and absolutely no more). It works by trying to fully decode a +// Huffman code by using whatever bits are currently present in the bit buffer. If this fails, it reads another byte, and tries again until it succeeds or until the +// bit buffer contains >=15 bits (deflate's max. Huffman code size). +#define TINFL_HUFF_BITBUF_FILL(state_index, pHuff) \ + do { \ + temp = (pHuff)->m_look_up[bit_buf & (TINFL_FAST_LOOKUP_SIZE - 1)]; \ + if (temp >= 0) { \ + code_len = temp >> 9; \ + if ((code_len) && (num_bits >= code_len)) \ + break; \ + } else if (num_bits > TINFL_FAST_LOOKUP_BITS) { \ + code_len = TINFL_FAST_LOOKUP_BITS; \ + do { \ + temp = (pHuff)->m_tree[~temp + ((bit_buf >> code_len++) & 1)]; \ + } while ((temp < 0) && (num_bits >= (code_len + 1))); if (temp >= 0) break; \ + } TINFL_GET_BYTE(state_index, c); bit_buf |= (((tinfl_bit_buf_t)c) << num_bits); num_bits += 8; \ + } while (num_bits < 15); + +// TINFL_HUFF_DECODE() decodes the next Huffman coded symbol. It's more complex than you would initially expect because the zlib API expects the decompressor to never read +// beyond the final byte of the deflate stream. (In other words, when this macro wants to read another byte from the input, it REALLY needs another byte in order to fully +// decode the next Huffman code.) Handling this properly is particularly important on raw deflate (non-zlib) streams, which aren't followed by a byte aligned adler-32. +// The slow path is only executed at the very end of the input buffer. +#define TINFL_HUFF_DECODE(state_index, sym, pHuff) do { \ + int temp; mz_uint code_len, c; \ + if (num_bits < 15) { \ + if ((pIn_buf_end - pIn_buf_cur) < 2) { \ + TINFL_HUFF_BITBUF_FILL(state_index, pHuff); \ + } else { \ + bit_buf |= (((tinfl_bit_buf_t)pIn_buf_cur[0]) << num_bits) | (((tinfl_bit_buf_t)pIn_buf_cur[1]) << (num_bits + 8)); pIn_buf_cur += 2; num_bits += 16; \ + } \ + } \ + if ((temp = (pHuff)->m_look_up[bit_buf & (TINFL_FAST_LOOKUP_SIZE - 1)]) >= 0) \ + code_len = temp >> 9, temp &= 511; \ + else { \ + code_len = TINFL_FAST_LOOKUP_BITS; do { temp = (pHuff)->m_tree[~temp + ((bit_buf >> code_len++) & 1)]; } while (temp < 0); \ + } sym = temp; bit_buf >>= code_len; num_bits -= code_len; } MZ_MACRO_END + +tinfl_status tinfl_decompress(tinfl_decompressor *r, const mz_uint8 *pIn_buf_next, size_t *pIn_buf_size, mz_uint8 *pOut_buf_start, mz_uint8 *pOut_buf_next, size_t *pOut_buf_size, const mz_uint32 decomp_flags) +{ + static const int s_length_base[31] = { 3,4,5,6,7,8,9,10,11,13, 15,17,19,23,27,31,35,43,51,59, 67,83,99,115,131,163,195,227,258,0,0 }; + static const int s_length_extra[31]= { 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 }; + static const int s_dist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193, 257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0}; + static const int s_dist_extra[32] = { 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13}; + static const mz_uint8 s_length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 }; + static const int s_min_table_sizes[3] = { 257, 1, 4 }; + + tinfl_status status = TINFL_STATUS_FAILED; mz_uint32 num_bits, dist, counter, num_extra; tinfl_bit_buf_t bit_buf; + const mz_uint8 *pIn_buf_cur = pIn_buf_next, *const pIn_buf_end = pIn_buf_next + *pIn_buf_size; + mz_uint8 *pOut_buf_cur = pOut_buf_next, *const pOut_buf_end = pOut_buf_next + *pOut_buf_size; + size_t out_buf_size_mask = (decomp_flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF) ? (size_t)-1 : ((pOut_buf_next - pOut_buf_start) + *pOut_buf_size) - 1, dist_from_out_buf_start; + + // Ensure the output buffer's size is a power of 2, unless the output buffer is large enough to hold the entire output file (in which case it doesn't matter). + if (((out_buf_size_mask + 1) & out_buf_size_mask) || (pOut_buf_next < pOut_buf_start)) { *pIn_buf_size = *pOut_buf_size = 0; return TINFL_STATUS_BAD_PARAM; } + + num_bits = r->m_num_bits; bit_buf = r->m_bit_buf; dist = r->m_dist; counter = r->m_counter; num_extra = r->m_num_extra; dist_from_out_buf_start = r->m_dist_from_out_buf_start; + TINFL_CR_BEGIN + + bit_buf = num_bits = dist = counter = num_extra = r->m_zhdr0 = r->m_zhdr1 = 0; r->m_z_adler32 = r->m_check_adler32 = 1; + if (decomp_flags & TINFL_FLAG_PARSE_ZLIB_HEADER) + { + TINFL_GET_BYTE(1, r->m_zhdr0); TINFL_GET_BYTE(2, r->m_zhdr1); + counter = (((r->m_zhdr0 * 256 + r->m_zhdr1) % 31 != 0) || (r->m_zhdr1 & 32) || ((r->m_zhdr0 & 15) != 8)); + if (!(decomp_flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF)) counter |= (((1U << (8U + (r->m_zhdr0 >> 4))) > 32768U) || ((out_buf_size_mask + 1) < (size_t)(1U << (8U + (r->m_zhdr0 >> 4))))); + if (counter) { TINFL_CR_RETURN_FOREVER(36, TINFL_STATUS_FAILED); } + } + + do + { + TINFL_GET_BITS(3, r->m_final, 3); r->m_type = r->m_final >> 1; + if (r->m_type == 0) + { + TINFL_SKIP_BITS(5, num_bits & 7); + for (counter = 0; counter < 4; ++counter) { if (num_bits) TINFL_GET_BITS(6, r->m_raw_header[counter], 8); else TINFL_GET_BYTE(7, r->m_raw_header[counter]); } + if ((counter = (r->m_raw_header[0] | (r->m_raw_header[1] << 8))) != (mz_uint)(0xFFFF ^ (r->m_raw_header[2] | (r->m_raw_header[3] << 8)))) { TINFL_CR_RETURN_FOREVER(39, TINFL_STATUS_FAILED); } + while ((counter) && (num_bits)) + { + TINFL_GET_BITS(51, dist, 8); + while (pOut_buf_cur >= pOut_buf_end) { TINFL_CR_RETURN(52, TINFL_STATUS_HAS_MORE_OUTPUT); } + *pOut_buf_cur++ = (mz_uint8)dist; + counter--; + } + while (counter) + { + size_t n; while (pOut_buf_cur >= pOut_buf_end) { TINFL_CR_RETURN(9, TINFL_STATUS_HAS_MORE_OUTPUT); } + while (pIn_buf_cur >= pIn_buf_end) + { + if (decomp_flags & TINFL_FLAG_HAS_MORE_INPUT) + { + TINFL_CR_RETURN(38, TINFL_STATUS_NEEDS_MORE_INPUT); + } + else + { + TINFL_CR_RETURN_FOREVER(40, TINFL_STATUS_FAILED); + } + } + n = MZ_MIN(MZ_MIN((size_t)(pOut_buf_end - pOut_buf_cur), (size_t)(pIn_buf_end - pIn_buf_cur)), counter); + TINFL_MEMCPY(pOut_buf_cur, pIn_buf_cur, n); pIn_buf_cur += n; pOut_buf_cur += n; counter -= (mz_uint)n; + } + } + else if (r->m_type == 3) + { + TINFL_CR_RETURN_FOREVER(10, TINFL_STATUS_FAILED); + } + else + { + if (r->m_type == 1) + { + mz_uint8 *p = r->m_tables[0].m_code_size; mz_uint i; + r->m_table_sizes[0] = 288; r->m_table_sizes[1] = 32; TINFL_MEMSET(r->m_tables[1].m_code_size, 5, 32); + for ( i = 0; i <= 143; ++i) *p++ = 8; for ( ; i <= 255; ++i) *p++ = 9; for ( ; i <= 279; ++i) *p++ = 7; for ( ; i <= 287; ++i) *p++ = 8; + } + else + { + for (counter = 0; counter < 3; counter++) { TINFL_GET_BITS(11, r->m_table_sizes[counter], "\05\05\04"[counter]); r->m_table_sizes[counter] += s_min_table_sizes[counter]; } + MZ_CLEAR_OBJ(r->m_tables[2].m_code_size); for (counter = 0; counter < r->m_table_sizes[2]; counter++) { mz_uint s; TINFL_GET_BITS(14, s, 3); r->m_tables[2].m_code_size[s_length_dezigzag[counter]] = (mz_uint8)s; } + r->m_table_sizes[2] = 19; + } + for ( ; (int)r->m_type >= 0; r->m_type--) + { + int tree_next, tree_cur; tinfl_huff_table *pTable; + mz_uint i, j, used_syms, total, sym_index, next_code[17], total_syms[16]; pTable = &r->m_tables[r->m_type]; MZ_CLEAR_OBJ(total_syms); MZ_CLEAR_OBJ(pTable->m_look_up); MZ_CLEAR_OBJ(pTable->m_tree); + for (i = 0; i < r->m_table_sizes[r->m_type]; ++i) total_syms[pTable->m_code_size[i]]++; + used_syms = 0, total = 0; next_code[0] = next_code[1] = 0; + for (i = 1; i <= 15; ++i) { used_syms += total_syms[i]; next_code[i + 1] = (total = ((total + total_syms[i]) << 1)); } + if ((65536 != total) && (used_syms > 1)) + { + TINFL_CR_RETURN_FOREVER(35, TINFL_STATUS_FAILED); + } + for (tree_next = -1, sym_index = 0; sym_index < r->m_table_sizes[r->m_type]; ++sym_index) + { + mz_uint rev_code = 0, l, cur_code, code_size = pTable->m_code_size[sym_index]; if (!code_size) continue; + cur_code = next_code[code_size]++; for (l = code_size; l > 0; l--, cur_code >>= 1) rev_code = (rev_code << 1) | (cur_code & 1); + if (code_size <= TINFL_FAST_LOOKUP_BITS) { mz_int16 k = (mz_int16)((code_size << 9) | sym_index); while (rev_code < TINFL_FAST_LOOKUP_SIZE) { pTable->m_look_up[rev_code] = k; rev_code += (1 << code_size); } continue; } + if (0 == (tree_cur = pTable->m_look_up[rev_code & (TINFL_FAST_LOOKUP_SIZE - 1)])) { pTable->m_look_up[rev_code & (TINFL_FAST_LOOKUP_SIZE - 1)] = (mz_int16)tree_next; tree_cur = tree_next; tree_next -= 2; } + rev_code >>= (TINFL_FAST_LOOKUP_BITS - 1); + for (j = code_size; j > (TINFL_FAST_LOOKUP_BITS + 1); j--) + { + tree_cur -= ((rev_code >>= 1) & 1); + if (!pTable->m_tree[-tree_cur - 1]) { pTable->m_tree[-tree_cur - 1] = (mz_int16)tree_next; tree_cur = tree_next; tree_next -= 2; } else tree_cur = pTable->m_tree[-tree_cur - 1]; + } + tree_cur -= ((rev_code >>= 1) & 1); pTable->m_tree[-tree_cur - 1] = (mz_int16)sym_index; + } + if (r->m_type == 2) + { + for (counter = 0; counter < (r->m_table_sizes[0] + r->m_table_sizes[1]); ) + { + mz_uint s; TINFL_HUFF_DECODE(16, dist, &r->m_tables[2]); if (dist < 16) { r->m_len_codes[counter++] = (mz_uint8)dist; continue; } + if ((dist == 16) && (!counter)) + { + TINFL_CR_RETURN_FOREVER(17, TINFL_STATUS_FAILED); + } + num_extra = "\02\03\07"[dist - 16]; TINFL_GET_BITS(18, s, num_extra); s += "\03\03\013"[dist - 16]; + TINFL_MEMSET(r->m_len_codes + counter, (dist == 16) ? r->m_len_codes[counter - 1] : 0, s); counter += s; + } + if ((r->m_table_sizes[0] + r->m_table_sizes[1]) != counter) + { + TINFL_CR_RETURN_FOREVER(21, TINFL_STATUS_FAILED); + } + TINFL_MEMCPY(r->m_tables[0].m_code_size, r->m_len_codes, r->m_table_sizes[0]); TINFL_MEMCPY(r->m_tables[1].m_code_size, r->m_len_codes + r->m_table_sizes[0], r->m_table_sizes[1]); + } + } + for ( ; ; ) + { + mz_uint8 *pSrc; + for ( ; ; ) + { + if (((pIn_buf_end - pIn_buf_cur) < 4) || ((pOut_buf_end - pOut_buf_cur) < 2)) + { + TINFL_HUFF_DECODE(23, counter, &r->m_tables[0]); + if (counter >= 256) + break; + while (pOut_buf_cur >= pOut_buf_end) { TINFL_CR_RETURN(24, TINFL_STATUS_HAS_MORE_OUTPUT); } + *pOut_buf_cur++ = (mz_uint8)counter; + } + else + { + int sym2; mz_uint code_len; +#if TINFL_USE_64BIT_BITBUF + if (num_bits < 30) { bit_buf |= (((tinfl_bit_buf_t)MZ_READ_LE32(pIn_buf_cur)) << num_bits); pIn_buf_cur += 4; num_bits += 32; } +#else + if (num_bits < 15) { bit_buf |= (((tinfl_bit_buf_t)MZ_READ_LE16(pIn_buf_cur)) << num_bits); pIn_buf_cur += 2; num_bits += 16; } +#endif + if ((sym2 = r->m_tables[0].m_look_up[bit_buf & (TINFL_FAST_LOOKUP_SIZE - 1)]) >= 0) + code_len = sym2 >> 9; + else + { + code_len = TINFL_FAST_LOOKUP_BITS; do { sym2 = r->m_tables[0].m_tree[~sym2 + ((bit_buf >> code_len++) & 1)]; } while (sym2 < 0); + } + counter = sym2; bit_buf >>= code_len; num_bits -= code_len; + if (counter & 256) + break; + +#if !TINFL_USE_64BIT_BITBUF + if (num_bits < 15) { bit_buf |= (((tinfl_bit_buf_t)MZ_READ_LE16(pIn_buf_cur)) << num_bits); pIn_buf_cur += 2; num_bits += 16; } +#endif + if ((sym2 = r->m_tables[0].m_look_up[bit_buf & (TINFL_FAST_LOOKUP_SIZE - 1)]) >= 0) + code_len = sym2 >> 9; + else + { + code_len = TINFL_FAST_LOOKUP_BITS; do { sym2 = r->m_tables[0].m_tree[~sym2 + ((bit_buf >> code_len++) & 1)]; } while (sym2 < 0); + } + bit_buf >>= code_len; num_bits -= code_len; + + pOut_buf_cur[0] = (mz_uint8)counter; + if (sym2 & 256) + { + pOut_buf_cur++; + counter = sym2; + break; + } + pOut_buf_cur[1] = (mz_uint8)sym2; + pOut_buf_cur += 2; + } + } + if ((counter &= 511) == 256) break; + + num_extra = s_length_extra[counter - 257]; counter = s_length_base[counter - 257]; + if (num_extra) { mz_uint extra_bits; TINFL_GET_BITS(25, extra_bits, num_extra); counter += extra_bits; } + + TINFL_HUFF_DECODE(26, dist, &r->m_tables[1]); + num_extra = s_dist_extra[dist]; dist = s_dist_base[dist]; + if (num_extra) { mz_uint extra_bits; TINFL_GET_BITS(27, extra_bits, num_extra); dist += extra_bits; } + + dist_from_out_buf_start = pOut_buf_cur - pOut_buf_start; + if ((dist > dist_from_out_buf_start) && (decomp_flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF)) + { + TINFL_CR_RETURN_FOREVER(37, TINFL_STATUS_FAILED); + } + + pSrc = pOut_buf_start + ((dist_from_out_buf_start - dist) & out_buf_size_mask); + + if ((MZ_MAX(pOut_buf_cur, pSrc) + counter) > pOut_buf_end) + { + while (counter--) + { + while (pOut_buf_cur >= pOut_buf_end) { TINFL_CR_RETURN(53, TINFL_STATUS_HAS_MORE_OUTPUT); } + *pOut_buf_cur++ = pOut_buf_start[(dist_from_out_buf_start++ - dist) & out_buf_size_mask]; + } + continue; + } +#if MINIZ_USE_UNALIGNED_LOADS_AND_STORES + else if ((counter >= 9) && (counter <= dist)) + { + const mz_uint8 *pSrc_end = pSrc + (counter & ~7); + do + { + ((mz_uint32 *)pOut_buf_cur)[0] = ((const mz_uint32 *)pSrc)[0]; + ((mz_uint32 *)pOut_buf_cur)[1] = ((const mz_uint32 *)pSrc)[1]; + pOut_buf_cur += 8; + } while ((pSrc += 8) < pSrc_end); + if ((counter &= 7) < 3) + { + if (counter) + { + pOut_buf_cur[0] = pSrc[0]; + if (counter > 1) + pOut_buf_cur[1] = pSrc[1]; + pOut_buf_cur += counter; + } + continue; + } + } +#endif + do + { + pOut_buf_cur[0] = pSrc[0]; + pOut_buf_cur[1] = pSrc[1]; + pOut_buf_cur[2] = pSrc[2]; + pOut_buf_cur += 3; pSrc += 3; + } while ((int)(counter -= 3) > 2); + if ((int)counter > 0) + { + pOut_buf_cur[0] = pSrc[0]; + if ((int)counter > 1) + pOut_buf_cur[1] = pSrc[1]; + pOut_buf_cur += counter; + } + } + } + } while (!(r->m_final & 1)); + if (decomp_flags & TINFL_FLAG_PARSE_ZLIB_HEADER) + { + TINFL_SKIP_BITS(32, num_bits & 7); for (counter = 0; counter < 4; ++counter) { mz_uint s; if (num_bits) TINFL_GET_BITS(41, s, 8); else TINFL_GET_BYTE(42, s); r->m_z_adler32 = (r->m_z_adler32 << 8) | s; } + } + TINFL_CR_RETURN_FOREVER(34, TINFL_STATUS_DONE); + TINFL_CR_FINISH + +common_exit: + r->m_num_bits = num_bits; r->m_bit_buf = bit_buf; r->m_dist = dist; r->m_counter = counter; r->m_num_extra = num_extra; r->m_dist_from_out_buf_start = dist_from_out_buf_start; + *pIn_buf_size = pIn_buf_cur - pIn_buf_next; *pOut_buf_size = pOut_buf_cur - pOut_buf_next; + if ((decomp_flags & (TINFL_FLAG_PARSE_ZLIB_HEADER | TINFL_FLAG_COMPUTE_ADLER32)) && (status >= 0)) + { + const mz_uint8 *ptr = pOut_buf_next; size_t buf_len = *pOut_buf_size; + mz_uint32 i, s1 = r->m_check_adler32 & 0xffff, s2 = r->m_check_adler32 >> 16; size_t block_len = buf_len % 5552; + while (buf_len) + { + for (i = 0; i + 7 < block_len; i += 8, ptr += 8) + { + s1 += ptr[0], s2 += s1; s1 += ptr[1], s2 += s1; s1 += ptr[2], s2 += s1; s1 += ptr[3], s2 += s1; + s1 += ptr[4], s2 += s1; s1 += ptr[5], s2 += s1; s1 += ptr[6], s2 += s1; s1 += ptr[7], s2 += s1; + } + for ( ; i < block_len; ++i) s1 += *ptr++, s2 += s1; + s1 %= 65521U, s2 %= 65521U; buf_len -= block_len; block_len = 5552; + } + r->m_check_adler32 = (s2 << 16) + s1; if ((status == TINFL_STATUS_DONE) && (decomp_flags & TINFL_FLAG_PARSE_ZLIB_HEADER) && (r->m_check_adler32 != r->m_z_adler32)) status = TINFL_STATUS_ADLER32_MISMATCH; + } + return status; +} + +// Higher level helper functions. +void *tinfl_decompress_mem_to_heap(const void *pSrc_buf, size_t src_buf_len, size_t *pOut_len, int flags) +{ + tinfl_decompressor decomp; void *pBuf = NULL, *pNew_buf; size_t src_buf_ofs = 0, out_buf_capacity = 0; + *pOut_len = 0; + tinfl_init(&decomp); + for ( ; ; ) + { + size_t src_buf_size = src_buf_len - src_buf_ofs, dst_buf_size = out_buf_capacity - *pOut_len, new_out_buf_capacity; + tinfl_status status = tinfl_decompress(&decomp, (const mz_uint8*)pSrc_buf + src_buf_ofs, &src_buf_size, (mz_uint8*)pBuf, pBuf ? (mz_uint8*)pBuf + *pOut_len : NULL, &dst_buf_size, + (flags & ~TINFL_FLAG_HAS_MORE_INPUT) | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF); + if ((status < 0) || (status == TINFL_STATUS_NEEDS_MORE_INPUT)) + { + MZ_FREE(pBuf); *pOut_len = 0; return NULL; + } + src_buf_ofs += src_buf_size; + *pOut_len += dst_buf_size; + if (status == TINFL_STATUS_DONE) break; + new_out_buf_capacity = out_buf_capacity * 2; if (new_out_buf_capacity < 128) new_out_buf_capacity = 128; + pNew_buf = MZ_REALLOC(pBuf, new_out_buf_capacity); + if (!pNew_buf) + { + MZ_FREE(pBuf); *pOut_len = 0; return NULL; + } + pBuf = pNew_buf; out_buf_capacity = new_out_buf_capacity; + } + return pBuf; +} + +size_t tinfl_decompress_mem_to_mem(void *pOut_buf, size_t out_buf_len, const void *pSrc_buf, size_t src_buf_len, int flags) +{ + tinfl_decompressor decomp; tinfl_status status; tinfl_init(&decomp); + status = tinfl_decompress(&decomp, (const mz_uint8*)pSrc_buf, &src_buf_len, (mz_uint8*)pOut_buf, (mz_uint8*)pOut_buf, &out_buf_len, (flags & ~TINFL_FLAG_HAS_MORE_INPUT) | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF); + return (status != TINFL_STATUS_DONE) ? TINFL_DECOMPRESS_MEM_TO_MEM_FAILED : out_buf_len; +} + +int tinfl_decompress_mem_to_callback(const void *pIn_buf, size_t *pIn_buf_size, tinfl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags) +{ + int result = 0; + tinfl_decompressor decomp; + mz_uint8 *pDict = (mz_uint8*)MZ_MALLOC(TINFL_LZ_DICT_SIZE); size_t in_buf_ofs = 0, dict_ofs = 0; + if (!pDict) + return TINFL_STATUS_FAILED; + tinfl_init(&decomp); + for ( ; ; ) + { + size_t in_buf_size = *pIn_buf_size - in_buf_ofs, dst_buf_size = TINFL_LZ_DICT_SIZE - dict_ofs; + tinfl_status status = tinfl_decompress(&decomp, (const mz_uint8*)pIn_buf + in_buf_ofs, &in_buf_size, pDict, pDict + dict_ofs, &dst_buf_size, + (flags & ~(TINFL_FLAG_HAS_MORE_INPUT | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF))); + in_buf_ofs += in_buf_size; + if ((dst_buf_size) && (!(*pPut_buf_func)(pDict + dict_ofs, (int)dst_buf_size, pPut_buf_user))) + break; + if (status != TINFL_STATUS_HAS_MORE_OUTPUT) + { + result = (status == TINFL_STATUS_DONE); + break; + } + dict_ofs = (dict_ofs + dst_buf_size) & (TINFL_LZ_DICT_SIZE - 1); + } + MZ_FREE(pDict); + *pIn_buf_size = in_buf_ofs; + return result; +} + +// ------------------- Low-level Compression (independent from all decompression API's) + +// Purposely making these tables static for faster init and thread safety. +static const mz_uint16 s_tdefl_len_sym[256] = { + 257,258,259,260,261,262,263,264,265,265,266,266,267,267,268,268,269,269,269,269,270,270,270,270,271,271,271,271,272,272,272,272, + 273,273,273,273,273,273,273,273,274,274,274,274,274,274,274,274,275,275,275,275,275,275,275,275,276,276,276,276,276,276,276,276, + 277,277,277,277,277,277,277,277,277,277,277,277,277,277,277,277,278,278,278,278,278,278,278,278,278,278,278,278,278,278,278,278, + 279,279,279,279,279,279,279,279,279,279,279,279,279,279,279,279,280,280,280,280,280,280,280,280,280,280,280,280,280,280,280,280, + 281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281,281, + 282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282,282, + 283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283,283, + 284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,284,285 }; + +static const mz_uint8 s_tdefl_len_extra[256] = { + 0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, + 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4, + 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5, + 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,0 }; + +static const mz_uint8 s_tdefl_small_dist_sym[512] = { + 0,1,2,3,4,4,5,5,6,6,6,6,7,7,7,7,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11, + 11,11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13, + 13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,14,14,14,14, + 14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14, + 14,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15, + 15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,16,16,16,16,16,16,16,16,16,16,16,16,16, + 16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16, + 16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16, + 16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,17,17,17,17,17,17,17,17,17,17,17,17,17,17, + 17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17, + 17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17, + 17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17 }; + +static const mz_uint8 s_tdefl_small_dist_extra[512] = { + 0,0,0,0,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5, + 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, + 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, + 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7 }; + +static const mz_uint8 s_tdefl_large_dist_sym[128] = { + 0,0,18,19,20,20,21,21,22,22,22,22,23,23,23,23,24,24,24,24,24,24,24,24,25,25,25,25,25,25,25,25,26,26,26,26,26,26,26,26,26,26,26,26, + 26,26,26,26,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28, + 28,28,28,28,28,28,28,28,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29 }; + +static const mz_uint8 s_tdefl_large_dist_extra[128] = { + 0,0,8,8,9,9,9,9,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12, + 12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13, + 13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13 }; + +// Radix sorts tdefl_sym_freq[] array by 16-bit key m_key. Returns ptr to sorted values. +typedef struct { mz_uint16 m_key, m_sym_index; } tdefl_sym_freq; +static tdefl_sym_freq* tdefl_radix_sort_syms(mz_uint num_syms, tdefl_sym_freq* pSyms0, tdefl_sym_freq* pSyms1) +{ + mz_uint32 total_passes = 2, pass_shift, pass, i, hist[256 * 2]; tdefl_sym_freq* pCur_syms = pSyms0, *pNew_syms = pSyms1; MZ_CLEAR_OBJ(hist); + for (i = 0; i < num_syms; i++) { mz_uint freq = pSyms0[i].m_key; hist[freq & 0xFF]++; hist[256 + ((freq >> 8) & 0xFF)]++; } + while ((total_passes > 1) && (num_syms == hist[(total_passes - 1) * 256])) total_passes--; + for (pass_shift = 0, pass = 0; pass < total_passes; pass++, pass_shift += 8) + { + const mz_uint32* pHist = &hist[pass << 8]; + mz_uint offsets[256], cur_ofs = 0; + for (i = 0; i < 256; i++) { offsets[i] = cur_ofs; cur_ofs += pHist[i]; } + for (i = 0; i < num_syms; i++) pNew_syms[offsets[(pCur_syms[i].m_key >> pass_shift) & 0xFF]++] = pCur_syms[i]; + { tdefl_sym_freq* t = pCur_syms; pCur_syms = pNew_syms; pNew_syms = t; } + } + return pCur_syms; +} + +// tdefl_calculate_minimum_redundancy() originally written by: Alistair Moffat, alistair@cs.mu.oz.au, Jyrki Katajainen, jyrki@diku.dk, November 1996. +static void tdefl_calculate_minimum_redundancy(tdefl_sym_freq *A, int n) +{ + int root, leaf, next, avbl, used, dpth; + if (n==0) return; else if (n==1) { A[0].m_key = 1; return; } + A[0].m_key += A[1].m_key; root = 0; leaf = 2; + for (next=1; next < n-1; next++) + { + if (leaf>=n || A[root].m_key=n || (root=0; next--) A[next].m_key = A[A[next].m_key].m_key+1; + avbl = 1; used = dpth = 0; root = n-2; next = n-1; + while (avbl>0) + { + while (root>=0 && (int)A[root].m_key==dpth) { used++; root--; } + while (avbl>used) { A[next--].m_key = (mz_uint16)(dpth); avbl--; } + avbl = 2*used; dpth++; used = 0; + } +} + +// Limits canonical Huffman code table's max code size. +enum { TDEFL_MAX_SUPPORTED_HUFF_CODESIZE = 32 }; +static void tdefl_huffman_enforce_max_code_size(int *pNum_codes, int code_list_len, int max_code_size) +{ + int i; mz_uint32 total = 0; if (code_list_len <= 1) return; + for (i = max_code_size + 1; i <= TDEFL_MAX_SUPPORTED_HUFF_CODESIZE; i++) pNum_codes[max_code_size] += pNum_codes[i]; + for (i = max_code_size; i > 0; i--) total += (((mz_uint32)pNum_codes[i]) << (max_code_size - i)); + while (total != (1UL << max_code_size)) + { + pNum_codes[max_code_size]--; + for (i = max_code_size - 1; i > 0; i--) if (pNum_codes[i]) { pNum_codes[i]--; pNum_codes[i + 1] += 2; break; } + total--; + } +} + +static void tdefl_optimize_huffman_table(tdefl_compressor *d, int table_num, int table_len, int code_size_limit, int static_table) +{ + int i, j, l, num_codes[1 + TDEFL_MAX_SUPPORTED_HUFF_CODESIZE]; mz_uint next_code[TDEFL_MAX_SUPPORTED_HUFF_CODESIZE + 1]; MZ_CLEAR_OBJ(num_codes); + if (static_table) + { + for (i = 0; i < table_len; i++) num_codes[d->m_huff_code_sizes[table_num][i]]++; + } + else + { + tdefl_sym_freq syms0[TDEFL_MAX_HUFF_SYMBOLS], syms1[TDEFL_MAX_HUFF_SYMBOLS], *pSyms; + int num_used_syms = 0; + const mz_uint16 *pSym_count = &d->m_huff_count[table_num][0]; + for (i = 0; i < table_len; i++) if (pSym_count[i]) { syms0[num_used_syms].m_key = (mz_uint16)pSym_count[i]; syms0[num_used_syms++].m_sym_index = (mz_uint16)i; } + + pSyms = tdefl_radix_sort_syms(num_used_syms, syms0, syms1); tdefl_calculate_minimum_redundancy(pSyms, num_used_syms); + + for (i = 0; i < num_used_syms; i++) num_codes[pSyms[i].m_key]++; + + tdefl_huffman_enforce_max_code_size(num_codes, num_used_syms, code_size_limit); + + MZ_CLEAR_OBJ(d->m_huff_code_sizes[table_num]); MZ_CLEAR_OBJ(d->m_huff_codes[table_num]); + for (i = 1, j = num_used_syms; i <= code_size_limit; i++) + for (l = num_codes[i]; l > 0; l--) d->m_huff_code_sizes[table_num][pSyms[--j].m_sym_index] = (mz_uint8)(i); + } + + next_code[1] = 0; for (j = 0, i = 2; i <= code_size_limit; i++) next_code[i] = j = ((j + num_codes[i - 1]) << 1); + + for (i = 0; i < table_len; i++) + { + mz_uint rev_code = 0, code, code_size; if ((code_size = d->m_huff_code_sizes[table_num][i]) == 0) continue; + code = next_code[code_size]++; for (l = code_size; l > 0; l--, code >>= 1) rev_code = (rev_code << 1) | (code & 1); + d->m_huff_codes[table_num][i] = (mz_uint16)rev_code; + } +} + +#define TDEFL_PUT_BITS(b, l) do { \ + mz_uint bits = b; mz_uint len = l; MZ_ASSERT(bits <= ((1U << len) - 1U)); \ + d->m_bit_buffer |= (bits << d->m_bits_in); d->m_bits_in += len; \ + while (d->m_bits_in >= 8) { \ + if (d->m_pOutput_buf < d->m_pOutput_buf_end) \ + *d->m_pOutput_buf++ = (mz_uint8)(d->m_bit_buffer); \ + d->m_bit_buffer >>= 8; \ + d->m_bits_in -= 8; \ + } \ +} MZ_MACRO_END + +#define TDEFL_RLE_PREV_CODE_SIZE() { if (rle_repeat_count) { \ + if (rle_repeat_count < 3) { \ + d->m_huff_count[2][prev_code_size] = (mz_uint16)(d->m_huff_count[2][prev_code_size] + rle_repeat_count); \ + while (rle_repeat_count--) packed_code_sizes[num_packed_code_sizes++] = prev_code_size; \ + } else { \ + d->m_huff_count[2][16] = (mz_uint16)(d->m_huff_count[2][16] + 1); packed_code_sizes[num_packed_code_sizes++] = 16; packed_code_sizes[num_packed_code_sizes++] = (mz_uint8)(rle_repeat_count - 3); \ +} rle_repeat_count = 0; } } + +#define TDEFL_RLE_ZERO_CODE_SIZE() { if (rle_z_count) { \ + if (rle_z_count < 3) { \ + d->m_huff_count[2][0] = (mz_uint16)(d->m_huff_count[2][0] + rle_z_count); while (rle_z_count--) packed_code_sizes[num_packed_code_sizes++] = 0; \ + } else if (rle_z_count <= 10) { \ + d->m_huff_count[2][17] = (mz_uint16)(d->m_huff_count[2][17] + 1); packed_code_sizes[num_packed_code_sizes++] = 17; packed_code_sizes[num_packed_code_sizes++] = (mz_uint8)(rle_z_count - 3); \ + } else { \ + d->m_huff_count[2][18] = (mz_uint16)(d->m_huff_count[2][18] + 1); packed_code_sizes[num_packed_code_sizes++] = 18; packed_code_sizes[num_packed_code_sizes++] = (mz_uint8)(rle_z_count - 11); \ +} rle_z_count = 0; } } + +static mz_uint8 s_tdefl_packed_code_size_syms_swizzle[] = { 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 }; + +static void tdefl_start_dynamic_block(tdefl_compressor *d) +{ + int num_lit_codes, num_dist_codes, num_bit_lengths; mz_uint i, total_code_sizes_to_pack, num_packed_code_sizes, rle_z_count, rle_repeat_count, packed_code_sizes_index; + mz_uint8 code_sizes_to_pack[TDEFL_MAX_HUFF_SYMBOLS_0 + TDEFL_MAX_HUFF_SYMBOLS_1], packed_code_sizes[TDEFL_MAX_HUFF_SYMBOLS_0 + TDEFL_MAX_HUFF_SYMBOLS_1], prev_code_size = 0xFF; + + d->m_huff_count[0][256] = 1; + + tdefl_optimize_huffman_table(d, 0, TDEFL_MAX_HUFF_SYMBOLS_0, 15, MZ_FALSE); + tdefl_optimize_huffman_table(d, 1, TDEFL_MAX_HUFF_SYMBOLS_1, 15, MZ_FALSE); + + for (num_lit_codes = 286; num_lit_codes > 257; num_lit_codes--) if (d->m_huff_code_sizes[0][num_lit_codes - 1]) break; + for (num_dist_codes = 30; num_dist_codes > 1; num_dist_codes--) if (d->m_huff_code_sizes[1][num_dist_codes - 1]) break; + + memcpy(code_sizes_to_pack, &d->m_huff_code_sizes[0][0], num_lit_codes); + memcpy(code_sizes_to_pack + num_lit_codes, &d->m_huff_code_sizes[1][0], num_dist_codes); + total_code_sizes_to_pack = num_lit_codes + num_dist_codes; num_packed_code_sizes = 0; rle_z_count = 0; rle_repeat_count = 0; + + memset(&d->m_huff_count[2][0], 0, sizeof(d->m_huff_count[2][0]) * TDEFL_MAX_HUFF_SYMBOLS_2); + for (i = 0; i < total_code_sizes_to_pack; i++) + { + mz_uint8 code_size = code_sizes_to_pack[i]; + if (!code_size) + { + TDEFL_RLE_PREV_CODE_SIZE(); + if (++rle_z_count == 138) { TDEFL_RLE_ZERO_CODE_SIZE(); } + } + else + { + TDEFL_RLE_ZERO_CODE_SIZE(); + if (code_size != prev_code_size) + { + TDEFL_RLE_PREV_CODE_SIZE(); + d->m_huff_count[2][code_size] = (mz_uint16)(d->m_huff_count[2][code_size] + 1); packed_code_sizes[num_packed_code_sizes++] = code_size; + } + else if (++rle_repeat_count == 6) + { + TDEFL_RLE_PREV_CODE_SIZE(); + } + } + prev_code_size = code_size; + } + if (rle_repeat_count) { TDEFL_RLE_PREV_CODE_SIZE(); } else { TDEFL_RLE_ZERO_CODE_SIZE(); } + + tdefl_optimize_huffman_table(d, 2, TDEFL_MAX_HUFF_SYMBOLS_2, 7, MZ_FALSE); + + TDEFL_PUT_BITS(2, 2); + + TDEFL_PUT_BITS(num_lit_codes - 257, 5); + TDEFL_PUT_BITS(num_dist_codes - 1, 5); + + for (num_bit_lengths = 18; num_bit_lengths >= 0; num_bit_lengths--) if (d->m_huff_code_sizes[2][s_tdefl_packed_code_size_syms_swizzle[num_bit_lengths]]) break; + num_bit_lengths = MZ_MAX(4, (num_bit_lengths + 1)); TDEFL_PUT_BITS(num_bit_lengths - 4, 4); + for (i = 0; (int)i < num_bit_lengths; i++) TDEFL_PUT_BITS(d->m_huff_code_sizes[2][s_tdefl_packed_code_size_syms_swizzle[i]], 3); + + for (packed_code_sizes_index = 0; packed_code_sizes_index < num_packed_code_sizes; ) + { + mz_uint code = packed_code_sizes[packed_code_sizes_index++]; MZ_ASSERT(code < TDEFL_MAX_HUFF_SYMBOLS_2); + TDEFL_PUT_BITS(d->m_huff_codes[2][code], d->m_huff_code_sizes[2][code]); + if (code >= 16) TDEFL_PUT_BITS(packed_code_sizes[packed_code_sizes_index++], "\02\03\07"[code - 16]); + } +} + +static void tdefl_start_static_block(tdefl_compressor *d) +{ + mz_uint i; + mz_uint8 *p = &d->m_huff_code_sizes[0][0]; + + for (i = 0; i <= 143; ++i) *p++ = 8; + for ( ; i <= 255; ++i) *p++ = 9; + for ( ; i <= 279; ++i) *p++ = 7; + for ( ; i <= 287; ++i) *p++ = 8; + + memset(d->m_huff_code_sizes[1], 5, 32); + + tdefl_optimize_huffman_table(d, 0, 288, 15, MZ_TRUE); + tdefl_optimize_huffman_table(d, 1, 32, 15, MZ_TRUE); + + TDEFL_PUT_BITS(1, 2); +} + +static const mz_uint mz_bitmasks[17] = { 0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F, 0x007F, 0x00FF, 0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF }; + +#if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN && MINIZ_HAS_64BIT_REGISTERS +static mz_bool tdefl_compress_lz_codes(tdefl_compressor *d) +{ + mz_uint flags; + mz_uint8 *pLZ_codes; + mz_uint8 *pOutput_buf = d->m_pOutput_buf; + mz_uint8 *pLZ_code_buf_end = d->m_pLZ_code_buf; + mz_uint64 bit_buffer = d->m_bit_buffer; + mz_uint bits_in = d->m_bits_in; + +#define TDEFL_PUT_BITS_FAST(b, l) { bit_buffer |= (((mz_uint64)(b)) << bits_in); bits_in += (l); } + + flags = 1; + for (pLZ_codes = d->m_lz_code_buf; pLZ_codes < pLZ_code_buf_end; flags >>= 1) + { + if (flags == 1) + flags = *pLZ_codes++ | 0x100; + + if (flags & 1) + { + mz_uint s0, s1, n0, n1, sym, num_extra_bits; + mz_uint match_len = pLZ_codes[0], match_dist = *(const mz_uint16 *)(pLZ_codes + 1); pLZ_codes += 3; + + MZ_ASSERT(d->m_huff_code_sizes[0][s_tdefl_len_sym[match_len]]); + TDEFL_PUT_BITS_FAST(d->m_huff_codes[0][s_tdefl_len_sym[match_len]], d->m_huff_code_sizes[0][s_tdefl_len_sym[match_len]]); + TDEFL_PUT_BITS_FAST(match_len & mz_bitmasks[s_tdefl_len_extra[match_len]], s_tdefl_len_extra[match_len]); + + // This sequence coaxes MSVC into using cmov's vs. jmp's. + s0 = s_tdefl_small_dist_sym[match_dist & 511]; + n0 = s_tdefl_small_dist_extra[match_dist & 511]; + s1 = s_tdefl_large_dist_sym[match_dist >> 8]; + n1 = s_tdefl_large_dist_extra[match_dist >> 8]; + sym = (match_dist < 512) ? s0 : s1; + num_extra_bits = (match_dist < 512) ? n0 : n1; + + MZ_ASSERT(d->m_huff_code_sizes[1][sym]); + TDEFL_PUT_BITS_FAST(d->m_huff_codes[1][sym], d->m_huff_code_sizes[1][sym]); + TDEFL_PUT_BITS_FAST(match_dist & mz_bitmasks[num_extra_bits], num_extra_bits); + } + else + { + mz_uint lit = *pLZ_codes++; + MZ_ASSERT(d->m_huff_code_sizes[0][lit]); + TDEFL_PUT_BITS_FAST(d->m_huff_codes[0][lit], d->m_huff_code_sizes[0][lit]); + + if (((flags & 2) == 0) && (pLZ_codes < pLZ_code_buf_end)) + { + flags >>= 1; + lit = *pLZ_codes++; + MZ_ASSERT(d->m_huff_code_sizes[0][lit]); + TDEFL_PUT_BITS_FAST(d->m_huff_codes[0][lit], d->m_huff_code_sizes[0][lit]); + + if (((flags & 2) == 0) && (pLZ_codes < pLZ_code_buf_end)) + { + flags >>= 1; + lit = *pLZ_codes++; + MZ_ASSERT(d->m_huff_code_sizes[0][lit]); + TDEFL_PUT_BITS_FAST(d->m_huff_codes[0][lit], d->m_huff_code_sizes[0][lit]); + } + } + } + + if (pOutput_buf >= d->m_pOutput_buf_end) + return MZ_FALSE; + + *(mz_uint64*)pOutput_buf = bit_buffer; + pOutput_buf += (bits_in >> 3); + bit_buffer >>= (bits_in & ~7); + bits_in &= 7; + } + +#undef TDEFL_PUT_BITS_FAST + + d->m_pOutput_buf = pOutput_buf; + d->m_bits_in = 0; + d->m_bit_buffer = 0; + + while (bits_in) + { + mz_uint32 n = MZ_MIN(bits_in, 16); + TDEFL_PUT_BITS((mz_uint)bit_buffer & mz_bitmasks[n], n); + bit_buffer >>= n; + bits_in -= n; + } + + TDEFL_PUT_BITS(d->m_huff_codes[0][256], d->m_huff_code_sizes[0][256]); + + return (d->m_pOutput_buf < d->m_pOutput_buf_end); +} +#else +static mz_bool tdefl_compress_lz_codes(tdefl_compressor *d) +{ + mz_uint flags; + mz_uint8 *pLZ_codes; + + flags = 1; + for (pLZ_codes = d->m_lz_code_buf; pLZ_codes < d->m_pLZ_code_buf; flags >>= 1) + { + if (flags == 1) + flags = *pLZ_codes++ | 0x100; + if (flags & 1) + { + mz_uint sym, num_extra_bits; + mz_uint match_len = pLZ_codes[0], match_dist = (pLZ_codes[1] | (pLZ_codes[2] << 8)); pLZ_codes += 3; + + MZ_ASSERT(d->m_huff_code_sizes[0][s_tdefl_len_sym[match_len]]); + TDEFL_PUT_BITS(d->m_huff_codes[0][s_tdefl_len_sym[match_len]], d->m_huff_code_sizes[0][s_tdefl_len_sym[match_len]]); + TDEFL_PUT_BITS(match_len & mz_bitmasks[s_tdefl_len_extra[match_len]], s_tdefl_len_extra[match_len]); + + if (match_dist < 512) + { + sym = s_tdefl_small_dist_sym[match_dist]; num_extra_bits = s_tdefl_small_dist_extra[match_dist]; + } + else + { + sym = s_tdefl_large_dist_sym[match_dist >> 8]; num_extra_bits = s_tdefl_large_dist_extra[match_dist >> 8]; + } + MZ_ASSERT(d->m_huff_code_sizes[1][sym]); + TDEFL_PUT_BITS(d->m_huff_codes[1][sym], d->m_huff_code_sizes[1][sym]); + TDEFL_PUT_BITS(match_dist & mz_bitmasks[num_extra_bits], num_extra_bits); + } + else + { + mz_uint lit = *pLZ_codes++; + MZ_ASSERT(d->m_huff_code_sizes[0][lit]); + TDEFL_PUT_BITS(d->m_huff_codes[0][lit], d->m_huff_code_sizes[0][lit]); + } + } + + TDEFL_PUT_BITS(d->m_huff_codes[0][256], d->m_huff_code_sizes[0][256]); + + return (d->m_pOutput_buf < d->m_pOutput_buf_end); +} +#endif // MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN && MINIZ_HAS_64BIT_REGISTERS + +static mz_bool tdefl_compress_block(tdefl_compressor *d, mz_bool static_block) +{ + if (static_block) + tdefl_start_static_block(d); + else + tdefl_start_dynamic_block(d); + return tdefl_compress_lz_codes(d); +} + +static int tdefl_flush_block(tdefl_compressor *d, int flush) +{ + mz_uint saved_bit_buf, saved_bits_in; + mz_uint8 *pSaved_output_buf; + mz_bool comp_block_succeeded = MZ_FALSE; + int n, use_raw_block = ((d->m_flags & TDEFL_FORCE_ALL_RAW_BLOCKS) != 0) && (d->m_lookahead_pos - d->m_lz_code_buf_dict_pos) <= d->m_dict_size; + mz_uint8 *pOutput_buf_start = ((d->m_pPut_buf_func == NULL) && ((*d->m_pOut_buf_size - d->m_out_buf_ofs) >= TDEFL_OUT_BUF_SIZE)) ? ((mz_uint8 *)d->m_pOut_buf + d->m_out_buf_ofs) : d->m_output_buf; + + d->m_pOutput_buf = pOutput_buf_start; + d->m_pOutput_buf_end = d->m_pOutput_buf + TDEFL_OUT_BUF_SIZE - 16; + + MZ_ASSERT(!d->m_output_flush_remaining); + d->m_output_flush_ofs = 0; + d->m_output_flush_remaining = 0; + + *d->m_pLZ_flags = (mz_uint8)(*d->m_pLZ_flags >> d->m_num_flags_left); + d->m_pLZ_code_buf -= (d->m_num_flags_left == 8); + + if ((d->m_flags & TDEFL_WRITE_ZLIB_HEADER) && (!d->m_block_index)) + { + TDEFL_PUT_BITS(0x78, 8); TDEFL_PUT_BITS(0x01, 8); + } + + TDEFL_PUT_BITS(flush == TDEFL_FINISH, 1); + + pSaved_output_buf = d->m_pOutput_buf; saved_bit_buf = d->m_bit_buffer; saved_bits_in = d->m_bits_in; + + if (!use_raw_block) + comp_block_succeeded = tdefl_compress_block(d, (d->m_flags & TDEFL_FORCE_ALL_STATIC_BLOCKS) || (d->m_total_lz_bytes < 48)); + + // If the block gets expanded, forget the current contents of the output buffer and send a raw block instead. + if ( ((use_raw_block) || ((d->m_total_lz_bytes) && ((d->m_pOutput_buf - pSaved_output_buf + 1U) >= d->m_total_lz_bytes))) && + ((d->m_lookahead_pos - d->m_lz_code_buf_dict_pos) <= d->m_dict_size) ) + { + mz_uint i; d->m_pOutput_buf = pSaved_output_buf; d->m_bit_buffer = saved_bit_buf, d->m_bits_in = saved_bits_in; + TDEFL_PUT_BITS(0, 2); + if (d->m_bits_in) { TDEFL_PUT_BITS(0, 8 - d->m_bits_in); } + for (i = 2; i; --i, d->m_total_lz_bytes ^= 0xFFFF) + { + TDEFL_PUT_BITS(d->m_total_lz_bytes & 0xFFFF, 16); + } + for (i = 0; i < d->m_total_lz_bytes; ++i) + { + TDEFL_PUT_BITS(d->m_dict[(d->m_lz_code_buf_dict_pos + i) & TDEFL_LZ_DICT_SIZE_MASK], 8); + } + } + // Check for the extremely unlikely (if not impossible) case of the compressed block not fitting into the output buffer when using dynamic codes. + else if (!comp_block_succeeded) + { + d->m_pOutput_buf = pSaved_output_buf; d->m_bit_buffer = saved_bit_buf, d->m_bits_in = saved_bits_in; + tdefl_compress_block(d, MZ_TRUE); + } + + if (flush) + { + if (flush == TDEFL_FINISH) + { + if (d->m_bits_in) { TDEFL_PUT_BITS(0, 8 - d->m_bits_in); } + if (d->m_flags & TDEFL_WRITE_ZLIB_HEADER) { mz_uint i, a = d->m_adler32; for (i = 0; i < 4; i++) { TDEFL_PUT_BITS((a >> 24) & 0xFF, 8); a <<= 8; } } + } + else + { + mz_uint i, z = 0; TDEFL_PUT_BITS(0, 3); if (d->m_bits_in) { TDEFL_PUT_BITS(0, 8 - d->m_bits_in); } for (i = 2; i; --i, z ^= 0xFFFF) { TDEFL_PUT_BITS(z & 0xFFFF, 16); } + } + } + + MZ_ASSERT(d->m_pOutput_buf < d->m_pOutput_buf_end); + + memset(&d->m_huff_count[0][0], 0, sizeof(d->m_huff_count[0][0]) * TDEFL_MAX_HUFF_SYMBOLS_0); + memset(&d->m_huff_count[1][0], 0, sizeof(d->m_huff_count[1][0]) * TDEFL_MAX_HUFF_SYMBOLS_1); + + d->m_pLZ_code_buf = d->m_lz_code_buf + 1; d->m_pLZ_flags = d->m_lz_code_buf; d->m_num_flags_left = 8; d->m_lz_code_buf_dict_pos += d->m_total_lz_bytes; d->m_total_lz_bytes = 0; d->m_block_index++; + + if ((n = (int)(d->m_pOutput_buf - pOutput_buf_start)) != 0) + { + if (d->m_pPut_buf_func) + { + *d->m_pIn_buf_size = d->m_pSrc - (const mz_uint8 *)d->m_pIn_buf; + if (!(*d->m_pPut_buf_func)(d->m_output_buf, n, d->m_pPut_buf_user)) + return (d->m_prev_return_status = TDEFL_STATUS_PUT_BUF_FAILED); + } + else if (pOutput_buf_start == d->m_output_buf) + { + int bytes_to_copy = (int)MZ_MIN((size_t)n, (size_t)(*d->m_pOut_buf_size - d->m_out_buf_ofs)); + memcpy((mz_uint8 *)d->m_pOut_buf + d->m_out_buf_ofs, d->m_output_buf, bytes_to_copy); + d->m_out_buf_ofs += bytes_to_copy; + if ((n -= bytes_to_copy) != 0) + { + d->m_output_flush_ofs = bytes_to_copy; + d->m_output_flush_remaining = n; + } + } + else + { + d->m_out_buf_ofs += n; + } + } + + return d->m_output_flush_remaining; +} + +#if MINIZ_USE_UNALIGNED_LOADS_AND_STORES +#define TDEFL_READ_UNALIGNED_WORD(p) *(const mz_uint16*)(p) +static MZ_FORCEINLINE void tdefl_find_match(tdefl_compressor *d, mz_uint lookahead_pos, mz_uint max_dist, mz_uint max_match_len, mz_uint *pMatch_dist, mz_uint *pMatch_len) +{ + mz_uint dist, pos = lookahead_pos & TDEFL_LZ_DICT_SIZE_MASK, match_len = *pMatch_len, probe_pos = pos, next_probe_pos, probe_len; + mz_uint num_probes_left = d->m_max_probes[match_len >= 32]; + const mz_uint16 *s = (const mz_uint16*)(d->m_dict + pos), *p, *q; + mz_uint16 c01 = TDEFL_READ_UNALIGNED_WORD(&d->m_dict[pos + match_len - 1]), s01 = TDEFL_READ_UNALIGNED_WORD(s); + MZ_ASSERT(max_match_len <= TDEFL_MAX_MATCH_LEN); if (max_match_len <= match_len) return; + for ( ; ; ) + { + for ( ; ; ) + { + if (--num_probes_left == 0) return; + #define TDEFL_PROBE \ + next_probe_pos = d->m_next[probe_pos]; \ + if ((!next_probe_pos) || ((dist = (mz_uint16)(lookahead_pos - next_probe_pos)) > max_dist)) return; \ + probe_pos = next_probe_pos & TDEFL_LZ_DICT_SIZE_MASK; \ + if (TDEFL_READ_UNALIGNED_WORD(&d->m_dict[probe_pos + match_len - 1]) == c01) break; + TDEFL_PROBE; TDEFL_PROBE; TDEFL_PROBE; + } + if (!dist) break; q = (const mz_uint16*)(d->m_dict + probe_pos); if (TDEFL_READ_UNALIGNED_WORD(q) != s01) continue; p = s; probe_len = 32; + do { } while ( (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && + (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (--probe_len > 0) ); + if (!probe_len) + { + *pMatch_dist = dist; *pMatch_len = MZ_MIN(max_match_len, TDEFL_MAX_MATCH_LEN); break; + } + else if ((probe_len = ((mz_uint)(p - s) * 2) + (mz_uint)(*(const mz_uint8*)p == *(const mz_uint8*)q)) > match_len) + { + *pMatch_dist = dist; if ((*pMatch_len = match_len = MZ_MIN(max_match_len, probe_len)) == max_match_len) break; + c01 = TDEFL_READ_UNALIGNED_WORD(&d->m_dict[pos + match_len - 1]); + } + } +} +#else +static MZ_FORCEINLINE void tdefl_find_match(tdefl_compressor *d, mz_uint lookahead_pos, mz_uint max_dist, mz_uint max_match_len, mz_uint *pMatch_dist, mz_uint *pMatch_len) +{ + mz_uint dist, pos = lookahead_pos & TDEFL_LZ_DICT_SIZE_MASK, match_len = *pMatch_len, probe_pos = pos, next_probe_pos, probe_len; + mz_uint num_probes_left = d->m_max_probes[match_len >= 32]; + const mz_uint8 *s = d->m_dict + pos, *p, *q; + mz_uint8 c0 = d->m_dict[pos + match_len], c1 = d->m_dict[pos + match_len - 1]; + MZ_ASSERT(max_match_len <= TDEFL_MAX_MATCH_LEN); if (max_match_len <= match_len) return; + for ( ; ; ) + { + for ( ; ; ) + { + if (--num_probes_left == 0) return; + #define TDEFL_PROBE \ + next_probe_pos = d->m_next[probe_pos]; \ + if ((!next_probe_pos) || ((dist = (mz_uint16)(lookahead_pos - next_probe_pos)) > max_dist)) return; \ + probe_pos = next_probe_pos & TDEFL_LZ_DICT_SIZE_MASK; \ + if ((d->m_dict[probe_pos + match_len] == c0) && (d->m_dict[probe_pos + match_len - 1] == c1)) break; + TDEFL_PROBE; TDEFL_PROBE; TDEFL_PROBE; + } + if (!dist) break; p = s; q = d->m_dict + probe_pos; for (probe_len = 0; probe_len < max_match_len; probe_len++) if (*p++ != *q++) break; + if (probe_len > match_len) + { + *pMatch_dist = dist; if ((*pMatch_len = match_len = probe_len) == max_match_len) return; + c0 = d->m_dict[pos + match_len]; c1 = d->m_dict[pos + match_len - 1]; + } + } +} +#endif // #if MINIZ_USE_UNALIGNED_LOADS_AND_STORES + +#if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN +static mz_bool tdefl_compress_fast(tdefl_compressor *d) +{ + // Faster, minimally featured LZRW1-style match+parse loop with better register utilization. Intended for applications where raw throughput is valued more highly than ratio. + mz_uint lookahead_pos = d->m_lookahead_pos, lookahead_size = d->m_lookahead_size, dict_size = d->m_dict_size, total_lz_bytes = d->m_total_lz_bytes, num_flags_left = d->m_num_flags_left; + mz_uint8 *pLZ_code_buf = d->m_pLZ_code_buf, *pLZ_flags = d->m_pLZ_flags; + mz_uint cur_pos = lookahead_pos & TDEFL_LZ_DICT_SIZE_MASK; + + while ((d->m_src_buf_left) || ((d->m_flush) && (lookahead_size))) + { + const mz_uint TDEFL_COMP_FAST_LOOKAHEAD_SIZE = 4096; + mz_uint dst_pos = (lookahead_pos + lookahead_size) & TDEFL_LZ_DICT_SIZE_MASK; + mz_uint num_bytes_to_process = (mz_uint)MZ_MIN(d->m_src_buf_left, TDEFL_COMP_FAST_LOOKAHEAD_SIZE - lookahead_size); + d->m_src_buf_left -= num_bytes_to_process; + lookahead_size += num_bytes_to_process; + + while (num_bytes_to_process) + { + mz_uint32 n = MZ_MIN(TDEFL_LZ_DICT_SIZE - dst_pos, num_bytes_to_process); + memcpy(d->m_dict + dst_pos, d->m_pSrc, n); + if (dst_pos < (TDEFL_MAX_MATCH_LEN - 1)) + memcpy(d->m_dict + TDEFL_LZ_DICT_SIZE + dst_pos, d->m_pSrc, MZ_MIN(n, (TDEFL_MAX_MATCH_LEN - 1) - dst_pos)); + d->m_pSrc += n; + dst_pos = (dst_pos + n) & TDEFL_LZ_DICT_SIZE_MASK; + num_bytes_to_process -= n; + } + + dict_size = MZ_MIN(TDEFL_LZ_DICT_SIZE - lookahead_size, dict_size); + if ((!d->m_flush) && (lookahead_size < TDEFL_COMP_FAST_LOOKAHEAD_SIZE)) break; + + while (lookahead_size >= 4) + { + mz_uint cur_match_dist, cur_match_len = 1; + mz_uint8 *pCur_dict = d->m_dict + cur_pos; + mz_uint first_trigram = (*(const mz_uint32 *)pCur_dict) & 0xFFFFFF; + mz_uint hash = (first_trigram ^ (first_trigram >> (24 - (TDEFL_LZ_HASH_BITS - 8)))) & TDEFL_LEVEL1_HASH_SIZE_MASK; + mz_uint probe_pos = d->m_hash[hash]; + d->m_hash[hash] = (mz_uint16)lookahead_pos; + + if (((cur_match_dist = (mz_uint16)(lookahead_pos - probe_pos)) <= dict_size) && ((*(const mz_uint32 *)(d->m_dict + (probe_pos &= TDEFL_LZ_DICT_SIZE_MASK)) & 0xFFFFFF) == first_trigram)) + { + const mz_uint16 *p = (const mz_uint16 *)pCur_dict; + const mz_uint16 *q = (const mz_uint16 *)(d->m_dict + probe_pos); + mz_uint32 probe_len = 32; + do { } while ( (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && + (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (TDEFL_READ_UNALIGNED_WORD(++p) == TDEFL_READ_UNALIGNED_WORD(++q)) && (--probe_len > 0) ); + cur_match_len = ((mz_uint)(p - (const mz_uint16 *)pCur_dict) * 2) + (mz_uint)(*(const mz_uint8 *)p == *(const mz_uint8 *)q); + if (!probe_len) + cur_match_len = cur_match_dist ? TDEFL_MAX_MATCH_LEN : 0; + + if ((cur_match_len < TDEFL_MIN_MATCH_LEN) || ((cur_match_len == TDEFL_MIN_MATCH_LEN) && (cur_match_dist >= 8U*1024U))) + { + cur_match_len = 1; + *pLZ_code_buf++ = (mz_uint8)first_trigram; + *pLZ_flags = (mz_uint8)(*pLZ_flags >> 1); + d->m_huff_count[0][(mz_uint8)first_trigram]++; + } + else + { + mz_uint32 s0, s1; + cur_match_len = MZ_MIN(cur_match_len, lookahead_size); + + MZ_ASSERT((cur_match_len >= TDEFL_MIN_MATCH_LEN) && (cur_match_dist >= 1) && (cur_match_dist <= TDEFL_LZ_DICT_SIZE)); + + cur_match_dist--; + + pLZ_code_buf[0] = (mz_uint8)(cur_match_len - TDEFL_MIN_MATCH_LEN); + *(mz_uint16 *)(&pLZ_code_buf[1]) = (mz_uint16)cur_match_dist; + pLZ_code_buf += 3; + *pLZ_flags = (mz_uint8)((*pLZ_flags >> 1) | 0x80); + + s0 = s_tdefl_small_dist_sym[cur_match_dist & 511]; + s1 = s_tdefl_large_dist_sym[cur_match_dist >> 8]; + d->m_huff_count[1][(cur_match_dist < 512) ? s0 : s1]++; + + d->m_huff_count[0][s_tdefl_len_sym[cur_match_len - TDEFL_MIN_MATCH_LEN]]++; + } + } + else + { + *pLZ_code_buf++ = (mz_uint8)first_trigram; + *pLZ_flags = (mz_uint8)(*pLZ_flags >> 1); + d->m_huff_count[0][(mz_uint8)first_trigram]++; + } + + if (--num_flags_left == 0) { num_flags_left = 8; pLZ_flags = pLZ_code_buf++; } + + total_lz_bytes += cur_match_len; + lookahead_pos += cur_match_len; + dict_size = MZ_MIN(dict_size + cur_match_len, TDEFL_LZ_DICT_SIZE); + cur_pos = (cur_pos + cur_match_len) & TDEFL_LZ_DICT_SIZE_MASK; + MZ_ASSERT(lookahead_size >= cur_match_len); + lookahead_size -= cur_match_len; + + if (pLZ_code_buf > &d->m_lz_code_buf[TDEFL_LZ_CODE_BUF_SIZE - 8]) + { + int n; + d->m_lookahead_pos = lookahead_pos; d->m_lookahead_size = lookahead_size; d->m_dict_size = dict_size; + d->m_total_lz_bytes = total_lz_bytes; d->m_pLZ_code_buf = pLZ_code_buf; d->m_pLZ_flags = pLZ_flags; d->m_num_flags_left = num_flags_left; + if ((n = tdefl_flush_block(d, 0)) != 0) + return (n < 0) ? MZ_FALSE : MZ_TRUE; + total_lz_bytes = d->m_total_lz_bytes; pLZ_code_buf = d->m_pLZ_code_buf; pLZ_flags = d->m_pLZ_flags; num_flags_left = d->m_num_flags_left; + } + } + + while (lookahead_size) + { + mz_uint8 lit = d->m_dict[cur_pos]; + + total_lz_bytes++; + *pLZ_code_buf++ = lit; + *pLZ_flags = (mz_uint8)(*pLZ_flags >> 1); + if (--num_flags_left == 0) { num_flags_left = 8; pLZ_flags = pLZ_code_buf++; } + + d->m_huff_count[0][lit]++; + + lookahead_pos++; + dict_size = MZ_MIN(dict_size + 1, TDEFL_LZ_DICT_SIZE); + cur_pos = (cur_pos + 1) & TDEFL_LZ_DICT_SIZE_MASK; + lookahead_size--; + + if (pLZ_code_buf > &d->m_lz_code_buf[TDEFL_LZ_CODE_BUF_SIZE - 8]) + { + int n; + d->m_lookahead_pos = lookahead_pos; d->m_lookahead_size = lookahead_size; d->m_dict_size = dict_size; + d->m_total_lz_bytes = total_lz_bytes; d->m_pLZ_code_buf = pLZ_code_buf; d->m_pLZ_flags = pLZ_flags; d->m_num_flags_left = num_flags_left; + if ((n = tdefl_flush_block(d, 0)) != 0) + return (n < 0) ? MZ_FALSE : MZ_TRUE; + total_lz_bytes = d->m_total_lz_bytes; pLZ_code_buf = d->m_pLZ_code_buf; pLZ_flags = d->m_pLZ_flags; num_flags_left = d->m_num_flags_left; + } + } + } + + d->m_lookahead_pos = lookahead_pos; d->m_lookahead_size = lookahead_size; d->m_dict_size = dict_size; + d->m_total_lz_bytes = total_lz_bytes; d->m_pLZ_code_buf = pLZ_code_buf; d->m_pLZ_flags = pLZ_flags; d->m_num_flags_left = num_flags_left; + return MZ_TRUE; +} +#endif // MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN + +static MZ_FORCEINLINE void tdefl_record_literal(tdefl_compressor *d, mz_uint8 lit) +{ + d->m_total_lz_bytes++; + *d->m_pLZ_code_buf++ = lit; + *d->m_pLZ_flags = (mz_uint8)(*d->m_pLZ_flags >> 1); if (--d->m_num_flags_left == 0) { d->m_num_flags_left = 8; d->m_pLZ_flags = d->m_pLZ_code_buf++; } + d->m_huff_count[0][lit]++; +} + +static MZ_FORCEINLINE void tdefl_record_match(tdefl_compressor *d, mz_uint match_len, mz_uint match_dist) +{ + mz_uint32 s0, s1; + + MZ_ASSERT((match_len >= TDEFL_MIN_MATCH_LEN) && (match_dist >= 1) && (match_dist <= TDEFL_LZ_DICT_SIZE)); + + d->m_total_lz_bytes += match_len; + + d->m_pLZ_code_buf[0] = (mz_uint8)(match_len - TDEFL_MIN_MATCH_LEN); + + match_dist -= 1; + d->m_pLZ_code_buf[1] = (mz_uint8)(match_dist & 0xFF); + d->m_pLZ_code_buf[2] = (mz_uint8)(match_dist >> 8); d->m_pLZ_code_buf += 3; + + *d->m_pLZ_flags = (mz_uint8)((*d->m_pLZ_flags >> 1) | 0x80); if (--d->m_num_flags_left == 0) { d->m_num_flags_left = 8; d->m_pLZ_flags = d->m_pLZ_code_buf++; } + + s0 = s_tdefl_small_dist_sym[match_dist & 511]; s1 = s_tdefl_large_dist_sym[(match_dist >> 8) & 127]; + d->m_huff_count[1][(match_dist < 512) ? s0 : s1]++; + + if (match_len >= TDEFL_MIN_MATCH_LEN) d->m_huff_count[0][s_tdefl_len_sym[match_len - TDEFL_MIN_MATCH_LEN]]++; +} + +static mz_bool tdefl_compress_normal(tdefl_compressor *d) +{ + const mz_uint8 *pSrc = d->m_pSrc; size_t src_buf_left = d->m_src_buf_left; + tdefl_flush flush = d->m_flush; + + while ((src_buf_left) || ((flush) && (d->m_lookahead_size))) + { + mz_uint len_to_move, cur_match_dist, cur_match_len, cur_pos; + // Update dictionary and hash chains. Keeps the lookahead size equal to TDEFL_MAX_MATCH_LEN. + if ((d->m_lookahead_size + d->m_dict_size) >= (TDEFL_MIN_MATCH_LEN - 1)) + { + mz_uint dst_pos = (d->m_lookahead_pos + d->m_lookahead_size) & TDEFL_LZ_DICT_SIZE_MASK, ins_pos = d->m_lookahead_pos + d->m_lookahead_size - 2; + mz_uint hash = (d->m_dict[ins_pos & TDEFL_LZ_DICT_SIZE_MASK] << TDEFL_LZ_HASH_SHIFT) ^ d->m_dict[(ins_pos + 1) & TDEFL_LZ_DICT_SIZE_MASK]; + mz_uint num_bytes_to_process = (mz_uint)MZ_MIN(src_buf_left, TDEFL_MAX_MATCH_LEN - d->m_lookahead_size); + const mz_uint8 *pSrc_end = pSrc + num_bytes_to_process; + src_buf_left -= num_bytes_to_process; + d->m_lookahead_size += num_bytes_to_process; + while (pSrc != pSrc_end) + { + mz_uint8 c = *pSrc++; d->m_dict[dst_pos] = c; if (dst_pos < (TDEFL_MAX_MATCH_LEN - 1)) d->m_dict[TDEFL_LZ_DICT_SIZE + dst_pos] = c; + hash = ((hash << TDEFL_LZ_HASH_SHIFT) ^ c) & (TDEFL_LZ_HASH_SIZE - 1); + d->m_next[ins_pos & TDEFL_LZ_DICT_SIZE_MASK] = d->m_hash[hash]; d->m_hash[hash] = (mz_uint16)(ins_pos); + dst_pos = (dst_pos + 1) & TDEFL_LZ_DICT_SIZE_MASK; ins_pos++; + } + } + else + { + while ((src_buf_left) && (d->m_lookahead_size < TDEFL_MAX_MATCH_LEN)) + { + mz_uint8 c = *pSrc++; + mz_uint dst_pos = (d->m_lookahead_pos + d->m_lookahead_size) & TDEFL_LZ_DICT_SIZE_MASK; + src_buf_left--; + d->m_dict[dst_pos] = c; + if (dst_pos < (TDEFL_MAX_MATCH_LEN - 1)) + d->m_dict[TDEFL_LZ_DICT_SIZE + dst_pos] = c; + if ((++d->m_lookahead_size + d->m_dict_size) >= TDEFL_MIN_MATCH_LEN) + { + mz_uint ins_pos = d->m_lookahead_pos + (d->m_lookahead_size - 1) - 2; + mz_uint hash = ((d->m_dict[ins_pos & TDEFL_LZ_DICT_SIZE_MASK] << (TDEFL_LZ_HASH_SHIFT * 2)) ^ (d->m_dict[(ins_pos + 1) & TDEFL_LZ_DICT_SIZE_MASK] << TDEFL_LZ_HASH_SHIFT) ^ c) & (TDEFL_LZ_HASH_SIZE - 1); + d->m_next[ins_pos & TDEFL_LZ_DICT_SIZE_MASK] = d->m_hash[hash]; d->m_hash[hash] = (mz_uint16)(ins_pos); + } + } + } + d->m_dict_size = MZ_MIN(TDEFL_LZ_DICT_SIZE - d->m_lookahead_size, d->m_dict_size); + if ((!flush) && (d->m_lookahead_size < TDEFL_MAX_MATCH_LEN)) + break; + + // Simple lazy/greedy parsing state machine. + len_to_move = 1; cur_match_dist = 0; cur_match_len = d->m_saved_match_len ? d->m_saved_match_len : (TDEFL_MIN_MATCH_LEN - 1); cur_pos = d->m_lookahead_pos & TDEFL_LZ_DICT_SIZE_MASK; + if (d->m_flags & (TDEFL_RLE_MATCHES | TDEFL_FORCE_ALL_RAW_BLOCKS)) + { + if ((d->m_dict_size) && (!(d->m_flags & TDEFL_FORCE_ALL_RAW_BLOCKS))) + { + mz_uint8 c = d->m_dict[(cur_pos - 1) & TDEFL_LZ_DICT_SIZE_MASK]; + cur_match_len = 0; while (cur_match_len < d->m_lookahead_size) { if (d->m_dict[cur_pos + cur_match_len] != c) break; cur_match_len++; } + if (cur_match_len < TDEFL_MIN_MATCH_LEN) cur_match_len = 0; else cur_match_dist = 1; + } + } + else + { + tdefl_find_match(d, d->m_lookahead_pos, d->m_dict_size, d->m_lookahead_size, &cur_match_dist, &cur_match_len); + } + if (((cur_match_len == TDEFL_MIN_MATCH_LEN) && (cur_match_dist >= 8U*1024U)) || (cur_pos == cur_match_dist) || ((d->m_flags & TDEFL_FILTER_MATCHES) && (cur_match_len <= 5))) + { + cur_match_dist = cur_match_len = 0; + } + if (d->m_saved_match_len) + { + if (cur_match_len > d->m_saved_match_len) + { + tdefl_record_literal(d, (mz_uint8)d->m_saved_lit); + if (cur_match_len >= 128) + { + tdefl_record_match(d, cur_match_len, cur_match_dist); + d->m_saved_match_len = 0; len_to_move = cur_match_len; + } + else + { + d->m_saved_lit = d->m_dict[cur_pos]; d->m_saved_match_dist = cur_match_dist; d->m_saved_match_len = cur_match_len; + } + } + else + { + tdefl_record_match(d, d->m_saved_match_len, d->m_saved_match_dist); + len_to_move = d->m_saved_match_len - 1; d->m_saved_match_len = 0; + } + } + else if (!cur_match_dist) + tdefl_record_literal(d, d->m_dict[MZ_MIN(cur_pos, sizeof(d->m_dict) - 1)]); + else if ((d->m_greedy_parsing) || (d->m_flags & TDEFL_RLE_MATCHES) || (cur_match_len >= 128)) + { + tdefl_record_match(d, cur_match_len, cur_match_dist); + len_to_move = cur_match_len; + } + else + { + d->m_saved_lit = d->m_dict[MZ_MIN(cur_pos, sizeof(d->m_dict) - 1)]; d->m_saved_match_dist = cur_match_dist; d->m_saved_match_len = cur_match_len; + } + // Move the lookahead forward by len_to_move bytes. + d->m_lookahead_pos += len_to_move; + MZ_ASSERT(d->m_lookahead_size >= len_to_move); + d->m_lookahead_size -= len_to_move; + d->m_dict_size = MZ_MIN(d->m_dict_size + len_to_move, TDEFL_LZ_DICT_SIZE); + // Check if it's time to flush the current LZ codes to the internal output buffer. + if ( (d->m_pLZ_code_buf > &d->m_lz_code_buf[TDEFL_LZ_CODE_BUF_SIZE - 8]) || + ( (d->m_total_lz_bytes > 31*1024) && (((((mz_uint)(d->m_pLZ_code_buf - d->m_lz_code_buf) * 115) >> 7) >= d->m_total_lz_bytes) || (d->m_flags & TDEFL_FORCE_ALL_RAW_BLOCKS))) ) + { + int n; + d->m_pSrc = pSrc; d->m_src_buf_left = src_buf_left; + if ((n = tdefl_flush_block(d, 0)) != 0) + return (n < 0) ? MZ_FALSE : MZ_TRUE; + } + } + + d->m_pSrc = pSrc; d->m_src_buf_left = src_buf_left; + return MZ_TRUE; +} + +static tdefl_status tdefl_flush_output_buffer(tdefl_compressor *d) +{ + if (d->m_pIn_buf_size) + { + *d->m_pIn_buf_size = d->m_pSrc - (const mz_uint8 *)d->m_pIn_buf; + } + + if (d->m_pOut_buf_size) + { + size_t n = MZ_MIN(*d->m_pOut_buf_size - d->m_out_buf_ofs, d->m_output_flush_remaining); + memcpy((mz_uint8 *)d->m_pOut_buf + d->m_out_buf_ofs, d->m_output_buf + d->m_output_flush_ofs, n); + d->m_output_flush_ofs += (mz_uint)n; + d->m_output_flush_remaining -= (mz_uint)n; + d->m_out_buf_ofs += n; + + *d->m_pOut_buf_size = d->m_out_buf_ofs; + } + + return (d->m_finished && !d->m_output_flush_remaining) ? TDEFL_STATUS_DONE : TDEFL_STATUS_OKAY; +} + +tdefl_status tdefl_compress(tdefl_compressor *d, const void *pIn_buf, size_t *pIn_buf_size, void *pOut_buf, size_t *pOut_buf_size, tdefl_flush flush) +{ + if (!d) + { + if (pIn_buf_size) *pIn_buf_size = 0; + if (pOut_buf_size) *pOut_buf_size = 0; + return TDEFL_STATUS_BAD_PARAM; + } + + d->m_pIn_buf = pIn_buf; d->m_pIn_buf_size = pIn_buf_size; + d->m_pOut_buf = pOut_buf; d->m_pOut_buf_size = pOut_buf_size; + d->m_pSrc = (const mz_uint8 *)(pIn_buf); d->m_src_buf_left = pIn_buf_size ? *pIn_buf_size : 0; + d->m_out_buf_ofs = 0; + d->m_flush = flush; + + if ( ((d->m_pPut_buf_func != NULL) == ((pOut_buf != NULL) || (pOut_buf_size != NULL))) || (d->m_prev_return_status != TDEFL_STATUS_OKAY) || + (d->m_wants_to_finish && (flush != TDEFL_FINISH)) || (pIn_buf_size && *pIn_buf_size && !pIn_buf) || (pOut_buf_size && *pOut_buf_size && !pOut_buf) ) + { + if (pIn_buf_size) *pIn_buf_size = 0; + if (pOut_buf_size) *pOut_buf_size = 0; + return (d->m_prev_return_status = TDEFL_STATUS_BAD_PARAM); + } + d->m_wants_to_finish |= (flush == TDEFL_FINISH); + + if ((d->m_output_flush_remaining) || (d->m_finished)) + return (d->m_prev_return_status = tdefl_flush_output_buffer(d)); + +#if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN + if (((d->m_flags & TDEFL_MAX_PROBES_MASK) == 1) && + ((d->m_flags & TDEFL_GREEDY_PARSING_FLAG) != 0) && + ((d->m_flags & (TDEFL_FILTER_MATCHES | TDEFL_FORCE_ALL_RAW_BLOCKS | TDEFL_RLE_MATCHES)) == 0)) + { + if (!tdefl_compress_fast(d)) + return d->m_prev_return_status; + } + else +#endif // #if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN + { + if (!tdefl_compress_normal(d)) + return d->m_prev_return_status; + } + + if ((d->m_flags & (TDEFL_WRITE_ZLIB_HEADER | TDEFL_COMPUTE_ADLER32)) && (pIn_buf)) + d->m_adler32 = (mz_uint32)mz_adler32(d->m_adler32, (const mz_uint8 *)pIn_buf, d->m_pSrc - (const mz_uint8 *)pIn_buf); + + if ((flush) && (!d->m_lookahead_size) && (!d->m_src_buf_left) && (!d->m_output_flush_remaining)) + { + if (tdefl_flush_block(d, flush) < 0) + return d->m_prev_return_status; + d->m_finished = (flush == TDEFL_FINISH); + if (flush == TDEFL_FULL_FLUSH) { MZ_CLEAR_OBJ(d->m_hash); MZ_CLEAR_OBJ(d->m_next); d->m_dict_size = 0; } + } + + return (d->m_prev_return_status = tdefl_flush_output_buffer(d)); +} + +tdefl_status tdefl_compress_buffer(tdefl_compressor *d, const void *pIn_buf, size_t in_buf_size, tdefl_flush flush) +{ + MZ_ASSERT(d->m_pPut_buf_func); return tdefl_compress(d, pIn_buf, &in_buf_size, NULL, NULL, flush); +} + +tdefl_status tdefl_init(tdefl_compressor *d, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags) +{ + d->m_pPut_buf_func = pPut_buf_func; d->m_pPut_buf_user = pPut_buf_user; + d->m_flags = (mz_uint)(flags); d->m_max_probes[0] = 1 + ((flags & 0xFFF) + 2) / 3; d->m_greedy_parsing = (flags & TDEFL_GREEDY_PARSING_FLAG) != 0; + d->m_max_probes[1] = 1 + (((flags & 0xFFF) >> 2) + 2) / 3; + if (!(flags & TDEFL_NONDETERMINISTIC_PARSING_FLAG)) MZ_CLEAR_OBJ(d->m_hash); + d->m_lookahead_pos = d->m_lookahead_size = d->m_dict_size = d->m_total_lz_bytes = d->m_lz_code_buf_dict_pos = d->m_bits_in = 0; + d->m_output_flush_ofs = d->m_output_flush_remaining = d->m_finished = d->m_block_index = d->m_bit_buffer = d->m_wants_to_finish = 0; + d->m_pLZ_code_buf = d->m_lz_code_buf + 1; d->m_pLZ_flags = d->m_lz_code_buf; d->m_num_flags_left = 8; + d->m_pOutput_buf = d->m_output_buf; d->m_pOutput_buf_end = d->m_output_buf; d->m_prev_return_status = TDEFL_STATUS_OKAY; + d->m_saved_match_dist = d->m_saved_match_len = d->m_saved_lit = 0; d->m_adler32 = 1; + d->m_pIn_buf = NULL; d->m_pOut_buf = NULL; + d->m_pIn_buf_size = NULL; d->m_pOut_buf_size = NULL; + d->m_flush = TDEFL_NO_FLUSH; d->m_pSrc = NULL; d->m_src_buf_left = 0; d->m_out_buf_ofs = 0; + memset(&d->m_huff_count[0][0], 0, sizeof(d->m_huff_count[0][0]) * TDEFL_MAX_HUFF_SYMBOLS_0); + memset(&d->m_huff_count[1][0], 0, sizeof(d->m_huff_count[1][0]) * TDEFL_MAX_HUFF_SYMBOLS_1); + return TDEFL_STATUS_OKAY; +} + +tdefl_status tdefl_get_prev_return_status(tdefl_compressor *d) +{ + return d->m_prev_return_status; +} + +mz_uint32 tdefl_get_adler32(tdefl_compressor *d) +{ + return d->m_adler32; +} + +mz_bool tdefl_compress_mem_to_output(const void *pBuf, size_t buf_len, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags) +{ + tdefl_compressor *pComp; mz_bool succeeded; if (((buf_len) && (!pBuf)) || (!pPut_buf_func)) return MZ_FALSE; + pComp = (tdefl_compressor*)MZ_MALLOC(sizeof(tdefl_compressor)); if (!pComp) return MZ_FALSE; + succeeded = (tdefl_init(pComp, pPut_buf_func, pPut_buf_user, flags) == TDEFL_STATUS_OKAY); + succeeded = succeeded && (tdefl_compress_buffer(pComp, pBuf, buf_len, TDEFL_FINISH) == TDEFL_STATUS_DONE); + MZ_FREE(pComp); return succeeded; +} + +typedef struct +{ + size_t m_size, m_capacity; + mz_uint8 *m_pBuf; + mz_bool m_expandable; +} tdefl_output_buffer; + +static mz_bool tdefl_output_buffer_putter(const void *pBuf, int len, void *pUser) +{ + tdefl_output_buffer *p = (tdefl_output_buffer *)pUser; + size_t new_size = p->m_size + len; + if (new_size > p->m_capacity) + { + size_t new_capacity = p->m_capacity; mz_uint8 *pNew_buf; if (!p->m_expandable) return MZ_FALSE; + do { new_capacity = MZ_MAX(128U, new_capacity << 1U); } while (new_size > new_capacity); + pNew_buf = (mz_uint8*)MZ_REALLOC(p->m_pBuf, new_capacity); if (!pNew_buf) return MZ_FALSE; + p->m_pBuf = pNew_buf; p->m_capacity = new_capacity; + } + memcpy((mz_uint8*)p->m_pBuf + p->m_size, pBuf, len); p->m_size = new_size; + return MZ_TRUE; +} + +void *tdefl_compress_mem_to_heap(const void *pSrc_buf, size_t src_buf_len, size_t *pOut_len, int flags) +{ + tdefl_output_buffer out_buf; MZ_CLEAR_OBJ(out_buf); + if (!pOut_len) return MZ_FALSE; else *pOut_len = 0; + out_buf.m_expandable = MZ_TRUE; + if (!tdefl_compress_mem_to_output(pSrc_buf, src_buf_len, tdefl_output_buffer_putter, &out_buf, flags)) return NULL; + *pOut_len = out_buf.m_size; return out_buf.m_pBuf; +} + +size_t tdefl_compress_mem_to_mem(void *pOut_buf, size_t out_buf_len, const void *pSrc_buf, size_t src_buf_len, int flags) +{ + tdefl_output_buffer out_buf; MZ_CLEAR_OBJ(out_buf); + if (!pOut_buf) return 0; + out_buf.m_pBuf = (mz_uint8*)pOut_buf; out_buf.m_capacity = out_buf_len; + if (!tdefl_compress_mem_to_output(pSrc_buf, src_buf_len, tdefl_output_buffer_putter, &out_buf, flags)) return 0; + return out_buf.m_size; +} + +#ifndef MINIZ_NO_ZLIB_APIS +static const mz_uint s_tdefl_num_probes[11] = { 0, 1, 6, 32, 16, 32, 128, 256, 512, 768, 1500 }; + +// level may actually range from [0,10] (10 is a "hidden" max level, where we want a bit more compression and it's fine if throughput to fall off a cliff on some files). +mz_uint tdefl_create_comp_flags_from_zip_params(int level, int window_bits, int strategy) +{ + mz_uint comp_flags = s_tdefl_num_probes[(level >= 0) ? MZ_MIN(10, level) : MZ_DEFAULT_LEVEL] | ((level <= 3) ? TDEFL_GREEDY_PARSING_FLAG : 0); + if (window_bits > 0) comp_flags |= TDEFL_WRITE_ZLIB_HEADER; + + if (!level) comp_flags |= TDEFL_FORCE_ALL_RAW_BLOCKS; + else if (strategy == MZ_FILTERED) comp_flags |= TDEFL_FILTER_MATCHES; + else if (strategy == MZ_HUFFMAN_ONLY) comp_flags &= ~TDEFL_MAX_PROBES_MASK; + else if (strategy == MZ_FIXED) comp_flags |= TDEFL_FORCE_ALL_STATIC_BLOCKS; + else if (strategy == MZ_RLE) comp_flags |= TDEFL_RLE_MATCHES; + + return comp_flags; +} +#endif //MINIZ_NO_ZLIB_APIS + +#ifdef _MSC_VER +#pragma warning (push) +#pragma warning (disable:4204) // nonstandard extension used : non-constant aggregate initializer (also supported by GNU C and C99, so no big deal) +#endif + +// Simple PNG writer function by Alex Evans, 2011. Released into the public domain: https://gist.github.com/908299, more context at +// http://altdevblogaday.org/2011/04/06/a-smaller-jpg-encoder/. +void *tdefl_write_image_to_png_file_in_memory(const void *pImage, int w, int h, int bpl, int num_chans, size_t *pLen_out) +{ + tdefl_compressor *pComp = (tdefl_compressor *)MZ_MALLOC(sizeof(tdefl_compressor)); tdefl_output_buffer out_buf; int i, y, z; mz_uint32 c; *pLen_out = 0; + if (!pComp) return NULL; + MZ_CLEAR_OBJ(out_buf); out_buf.m_expandable = MZ_TRUE; out_buf.m_capacity = 57+MZ_MAX(64, (1+bpl)*h); if (NULL == (out_buf.m_pBuf = (mz_uint8*)MZ_MALLOC(out_buf.m_capacity))) { MZ_FREE(pComp); return NULL; } + // write dummy header + for (z = 41; z; --z) tdefl_output_buffer_putter(&z, 1, &out_buf); + // compress image data + tdefl_init(pComp, tdefl_output_buffer_putter, &out_buf, TDEFL_DEFAULT_MAX_PROBES | TDEFL_WRITE_ZLIB_HEADER); + for (y = 0; y < h; ++y) { tdefl_compress_buffer(pComp, &z, 1, TDEFL_NO_FLUSH); tdefl_compress_buffer(pComp, (mz_uint8*)pImage + y * bpl, bpl, TDEFL_NO_FLUSH); } + if (tdefl_compress_buffer(pComp, NULL, 0, TDEFL_FINISH) != TDEFL_STATUS_DONE) { MZ_FREE(pComp); MZ_FREE(out_buf.m_pBuf); return NULL; } + // write real header + *pLen_out = out_buf.m_size-41; + { + mz_uint8 pnghdr[41]={0x89,0x50,0x4e,0x47,0x0d,0x0a,0x1a,0x0a,0x00,0x00,0x00,0x0d,0x49,0x48,0x44,0x52, + 0,0,(mz_uint8)(w>>8),(mz_uint8)w,0,0,(mz_uint8)(h>>8),(mz_uint8)h,8,"\0\0\04\02\06"[num_chans],0,0,0,0,0,0,0, + (mz_uint8)(*pLen_out>>24),(mz_uint8)(*pLen_out>>16),(mz_uint8)(*pLen_out>>8),(mz_uint8)*pLen_out,0x49,0x44,0x41,0x54}; + c=(mz_uint32)mz_crc32(MZ_CRC32_INIT,pnghdr+12,17); for (i=0; i<4; ++i, c<<=8) ((mz_uint8*)(pnghdr+29))[i]=(mz_uint8)(c>>24); + memcpy(out_buf.m_pBuf, pnghdr, 41); + } + // write footer (IDAT CRC-32, followed by IEND chunk) + if (!tdefl_output_buffer_putter("\0\0\0\0\0\0\0\0\x49\x45\x4e\x44\xae\x42\x60\x82", 16, &out_buf)) { *pLen_out = 0; MZ_FREE(pComp); MZ_FREE(out_buf.m_pBuf); return NULL; } + c = (mz_uint32)mz_crc32(MZ_CRC32_INIT,out_buf.m_pBuf+41-4, *pLen_out+4); for (i=0; i<4; ++i, c<<=8) (out_buf.m_pBuf+out_buf.m_size-16)[i] = (mz_uint8)(c >> 24); + // compute final size of file, grab compressed data buffer and return + *pLen_out += 57; MZ_FREE(pComp); return out_buf.m_pBuf; +} + +#ifdef _MSC_VER +#pragma warning (pop) +#endif + +// ------------------- .ZIP archive reading + +#ifndef MINIZ_NO_ARCHIVE_APIS + +#ifdef MINIZ_NO_STDIO + #define MZ_FILE void * +#else + #include + #include + #if defined(_MSC_VER) || defined(__MINGW64__) + #include + #define MZ_FILE FILE + #define MZ_FOPEN fopen + #define MZ_FCLOSE fclose + #define MZ_FREAD fread + #define MZ_FWRITE fwrite + #define MZ_FTELL64 _ftelli64 + #define MZ_FSEEK64 _fseeki64 + #define MZ_FILE_STAT_STRUCT _stat + #define MZ_FILE_STAT _stat + #define MZ_FFLUSH fflush + #define MZ_FREOPEN freopen + #define MZ_DELETE_FILE remove + #elif defined(__MINGW32__) + #include + #define MZ_FILE FILE + #define MZ_FOPEN fopen + #define MZ_FCLOSE fclose + #define MZ_FREAD fread + #define MZ_FWRITE fwrite + #define MZ_FTELL64 ftello64 + #define MZ_FSEEK64 fseeko64 + #define MZ_FILE_STAT_STRUCT _stat + #define MZ_FILE_STAT _stat + #define MZ_FFLUSH fflush + #define MZ_FREOPEN freopen + #define MZ_DELETE_FILE remove + #else + #include + #define MZ_FILE FILE + #define MZ_FOPEN fopen + #define MZ_FCLOSE fclose + #define MZ_FREAD fread + #define MZ_FWRITE fwrite + #define MZ_FTELL64 ftello + #define MZ_FSEEK64 fseeko + #define MZ_FILE_STAT_STRUCT stat + #define MZ_FILE_STAT stat + #define MZ_FFLUSH fflush + #define MZ_FREOPEN freopen + #define MZ_DELETE_FILE remove + #endif // #ifdef _MSC_VER +#endif // #ifdef MINIZ_NO_STDIO + +#define MZ_TOLOWER(c) ((((c) >= 'A') && ((c) <= 'Z')) ? ((c) - 'A' + 'a') : (c)) + +// Various ZIP archive enums. To completely avoid cross platform compiler alignment and platform endian issues, miniz.c doesn't use structs for any of this stuff. +enum +{ + // ZIP archive identifiers and record sizes + MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIG = 0x06054b50, MZ_ZIP_CENTRAL_DIR_HEADER_SIG = 0x02014b50, MZ_ZIP_LOCAL_DIR_HEADER_SIG = 0x04034b50, + MZ_ZIP_LOCAL_DIR_HEADER_SIZE = 30, MZ_ZIP_CENTRAL_DIR_HEADER_SIZE = 46, MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIZE = 22, + // Central directory header record offsets + MZ_ZIP_CDH_SIG_OFS = 0, MZ_ZIP_CDH_VERSION_MADE_BY_OFS = 4, MZ_ZIP_CDH_VERSION_NEEDED_OFS = 6, MZ_ZIP_CDH_BIT_FLAG_OFS = 8, + MZ_ZIP_CDH_METHOD_OFS = 10, MZ_ZIP_CDH_FILE_TIME_OFS = 12, MZ_ZIP_CDH_FILE_DATE_OFS = 14, MZ_ZIP_CDH_CRC32_OFS = 16, + MZ_ZIP_CDH_COMPRESSED_SIZE_OFS = 20, MZ_ZIP_CDH_DECOMPRESSED_SIZE_OFS = 24, MZ_ZIP_CDH_FILENAME_LEN_OFS = 28, MZ_ZIP_CDH_EXTRA_LEN_OFS = 30, + MZ_ZIP_CDH_COMMENT_LEN_OFS = 32, MZ_ZIP_CDH_DISK_START_OFS = 34, MZ_ZIP_CDH_INTERNAL_ATTR_OFS = 36, MZ_ZIP_CDH_EXTERNAL_ATTR_OFS = 38, MZ_ZIP_CDH_LOCAL_HEADER_OFS = 42, + // Local directory header offsets + MZ_ZIP_LDH_SIG_OFS = 0, MZ_ZIP_LDH_VERSION_NEEDED_OFS = 4, MZ_ZIP_LDH_BIT_FLAG_OFS = 6, MZ_ZIP_LDH_METHOD_OFS = 8, MZ_ZIP_LDH_FILE_TIME_OFS = 10, + MZ_ZIP_LDH_FILE_DATE_OFS = 12, MZ_ZIP_LDH_CRC32_OFS = 14, MZ_ZIP_LDH_COMPRESSED_SIZE_OFS = 18, MZ_ZIP_LDH_DECOMPRESSED_SIZE_OFS = 22, + MZ_ZIP_LDH_FILENAME_LEN_OFS = 26, MZ_ZIP_LDH_EXTRA_LEN_OFS = 28, + // End of central directory offsets + MZ_ZIP_ECDH_SIG_OFS = 0, MZ_ZIP_ECDH_NUM_THIS_DISK_OFS = 4, MZ_ZIP_ECDH_NUM_DISK_CDIR_OFS = 6, MZ_ZIP_ECDH_CDIR_NUM_ENTRIES_ON_DISK_OFS = 8, + MZ_ZIP_ECDH_CDIR_TOTAL_ENTRIES_OFS = 10, MZ_ZIP_ECDH_CDIR_SIZE_OFS = 12, MZ_ZIP_ECDH_CDIR_OFS_OFS = 16, MZ_ZIP_ECDH_COMMENT_SIZE_OFS = 20, +}; + +typedef struct +{ + void *m_p; + size_t m_size, m_capacity; + mz_uint m_element_size; +} mz_zip_array; + +struct mz_zip_internal_state_tag +{ + mz_zip_array m_central_dir; + mz_zip_array m_central_dir_offsets; + mz_zip_array m_sorted_central_dir_offsets; + MZ_FILE *m_pFile; + void *m_pMem; + size_t m_mem_size; + size_t m_mem_capacity; +}; + +#define MZ_ZIP_ARRAY_SET_ELEMENT_SIZE(array_ptr, element_size) (array_ptr)->m_element_size = element_size +#define MZ_ZIP_ARRAY_ELEMENT(array_ptr, element_type, index) ((element_type *)((array_ptr)->m_p))[index] + +static MZ_FORCEINLINE void mz_zip_array_clear(mz_zip_archive *pZip, mz_zip_array *pArray) +{ + pZip->m_pFree(pZip->m_pAlloc_opaque, pArray->m_p); + memset(pArray, 0, sizeof(mz_zip_array)); +} + +static mz_bool mz_zip_array_ensure_capacity(mz_zip_archive *pZip, mz_zip_array *pArray, size_t min_new_capacity, mz_uint growing) +{ + void *pNew_p; size_t new_capacity = min_new_capacity; MZ_ASSERT(pArray->m_element_size); if (pArray->m_capacity >= min_new_capacity) return MZ_TRUE; + if (growing) { new_capacity = MZ_MAX(1, pArray->m_capacity); while (new_capacity < min_new_capacity) new_capacity *= 2; } + if (NULL == (pNew_p = pZip->m_pRealloc(pZip->m_pAlloc_opaque, pArray->m_p, pArray->m_element_size, new_capacity))) return MZ_FALSE; + pArray->m_p = pNew_p; pArray->m_capacity = new_capacity; + return MZ_TRUE; +} + +static MZ_FORCEINLINE mz_bool mz_zip_array_reserve(mz_zip_archive *pZip, mz_zip_array *pArray, size_t new_capacity, mz_uint growing) +{ + if (new_capacity > pArray->m_capacity) { if (!mz_zip_array_ensure_capacity(pZip, pArray, new_capacity, growing)) return MZ_FALSE; } + return MZ_TRUE; +} + +static MZ_FORCEINLINE mz_bool mz_zip_array_resize(mz_zip_archive *pZip, mz_zip_array *pArray, size_t new_size, mz_uint growing) +{ + if (new_size > pArray->m_capacity) { if (!mz_zip_array_ensure_capacity(pZip, pArray, new_size, growing)) return MZ_FALSE; } + pArray->m_size = new_size; + return MZ_TRUE; +} + +static MZ_FORCEINLINE mz_bool mz_zip_array_ensure_room(mz_zip_archive *pZip, mz_zip_array *pArray, size_t n) +{ + return mz_zip_array_reserve(pZip, pArray, pArray->m_size + n, MZ_TRUE); +} + +static MZ_FORCEINLINE mz_bool mz_zip_array_push_back(mz_zip_archive *pZip, mz_zip_array *pArray, const void *pElements, size_t n) +{ + size_t orig_size = pArray->m_size; if (!mz_zip_array_resize(pZip, pArray, orig_size + n, MZ_TRUE)) return MZ_FALSE; + memcpy((mz_uint8*)pArray->m_p + orig_size * pArray->m_element_size, pElements, n * pArray->m_element_size); + return MZ_TRUE; +} + +#ifndef MINIZ_NO_TIME +static time_t mz_zip_dos_to_time_t(int dos_time, int dos_date) +{ + struct tm tm; + memset(&tm, 0, sizeof(tm)); tm.tm_isdst = -1; + tm.tm_year = ((dos_date >> 9) & 127) + 1980 - 1900; tm.tm_mon = ((dos_date >> 5) & 15) - 1; tm.tm_mday = dos_date & 31; + tm.tm_hour = (dos_time >> 11) & 31; tm.tm_min = (dos_time >> 5) & 63; tm.tm_sec = (dos_time << 1) & 62; + return mktime(&tm); +} + +static void mz_zip_time_to_dos_time(time_t time, mz_uint16 *pDOS_time, mz_uint16 *pDOS_date) +{ + struct tm *tm = localtime(&time); + *pDOS_time = (mz_uint16)(((tm->tm_hour) << 11) + ((tm->tm_min) << 5) + ((tm->tm_sec) >> 1)); + *pDOS_date = (mz_uint16)(((tm->tm_year + 1900 - 1980) << 9) + ((tm->tm_mon + 1) << 5) + tm->tm_mday); +} +#endif + +#ifndef MINIZ_NO_STDIO +static mz_bool mz_zip_get_file_modified_time(const char *pFilename, mz_uint16 *pDOS_time, mz_uint16 *pDOS_date) +{ +#ifdef MINIZ_NO_TIME + (void)pFilename; *pDOS_date = *pDOS_time = 0; +#else + struct MZ_FILE_STAT_STRUCT file_stat; if (MZ_FILE_STAT(pFilename, &file_stat) != 0) return MZ_FALSE; + mz_zip_time_to_dos_time(file_stat.st_mtime, pDOS_time, pDOS_date); +#endif // #ifdef MINIZ_NO_TIME + return MZ_TRUE; +} + +static mz_bool mz_zip_set_file_times(const char *pFilename, time_t access_time, time_t modified_time) +{ +#ifndef MINIZ_NO_TIME + struct utimbuf t; t.actime = access_time; t.modtime = modified_time; + return !utime(pFilename, &t); +#else + pFilename, access_time, modified_time; + return MZ_TRUE; +#endif // #ifndef MINIZ_NO_TIME +} +#endif + +static mz_bool mz_zip_reader_init_internal(mz_zip_archive *pZip, mz_uint32 flags) +{ + (void)flags; + if ((!pZip) || (pZip->m_pState) || (pZip->m_zip_mode != MZ_ZIP_MODE_INVALID)) + return MZ_FALSE; + + if (!pZip->m_pAlloc) pZip->m_pAlloc = def_alloc_func; + if (!pZip->m_pFree) pZip->m_pFree = def_free_func; + if (!pZip->m_pRealloc) pZip->m_pRealloc = def_realloc_func; + + pZip->m_zip_mode = MZ_ZIP_MODE_READING; + pZip->m_archive_size = 0; + pZip->m_central_directory_file_ofs = 0; + pZip->m_total_files = 0; + + if (NULL == (pZip->m_pState = (mz_zip_internal_state *)pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, sizeof(mz_zip_internal_state)))) + return MZ_FALSE; + memset(pZip->m_pState, 0, sizeof(mz_zip_internal_state)); + MZ_ZIP_ARRAY_SET_ELEMENT_SIZE(&pZip->m_pState->m_central_dir, sizeof(mz_uint8)); + MZ_ZIP_ARRAY_SET_ELEMENT_SIZE(&pZip->m_pState->m_central_dir_offsets, sizeof(mz_uint32)); + MZ_ZIP_ARRAY_SET_ELEMENT_SIZE(&pZip->m_pState->m_sorted_central_dir_offsets, sizeof(mz_uint32)); + return MZ_TRUE; +} + +static MZ_FORCEINLINE mz_bool mz_zip_reader_filename_less(const mz_zip_array *pCentral_dir_array, const mz_zip_array *pCentral_dir_offsets, mz_uint l_index, mz_uint r_index) +{ + const mz_uint8 *pL = &MZ_ZIP_ARRAY_ELEMENT(pCentral_dir_array, mz_uint8, MZ_ZIP_ARRAY_ELEMENT(pCentral_dir_offsets, mz_uint32, l_index)), *pE; + const mz_uint8 *pR = &MZ_ZIP_ARRAY_ELEMENT(pCentral_dir_array, mz_uint8, MZ_ZIP_ARRAY_ELEMENT(pCentral_dir_offsets, mz_uint32, r_index)); + mz_uint l_len = MZ_READ_LE16(pL + MZ_ZIP_CDH_FILENAME_LEN_OFS), r_len = MZ_READ_LE16(pR + MZ_ZIP_CDH_FILENAME_LEN_OFS); + mz_uint8 l = 0, r = 0; + pL += MZ_ZIP_CENTRAL_DIR_HEADER_SIZE; pR += MZ_ZIP_CENTRAL_DIR_HEADER_SIZE; + pE = pL + MZ_MIN(l_len, r_len); + while (pL < pE) + { + if ((l = MZ_TOLOWER(*pL)) != (r = MZ_TOLOWER(*pR))) + break; + pL++; pR++; + } + return (pL == pE) ? (l_len < r_len) : (l < r); +} + +#define MZ_SWAP_UINT32(a, b) do { mz_uint32 t = a; a = b; b = t; } MZ_MACRO_END + +// Heap sort of lowercased filenames, used to help accelerate plain central directory searches by mz_zip_reader_locate_file(). (Could also use qsort(), but it could allocate memory.) +static void mz_zip_reader_sort_central_dir_offsets_by_filename(mz_zip_archive *pZip) +{ + mz_zip_internal_state *pState = pZip->m_pState; + const mz_zip_array *pCentral_dir_offsets = &pState->m_central_dir_offsets; + const mz_zip_array *pCentral_dir = &pState->m_central_dir; + mz_uint32 *pIndices = &MZ_ZIP_ARRAY_ELEMENT(&pState->m_sorted_central_dir_offsets, mz_uint32, 0); + const int size = pZip->m_total_files; + int start = (size - 2) >> 1, end; + while (start >= 0) + { + int child, root = start; + for ( ; ; ) + { + if ((child = (root << 1) + 1) >= size) + break; + child += (((child + 1) < size) && (mz_zip_reader_filename_less(pCentral_dir, pCentral_dir_offsets, pIndices[child], pIndices[child + 1]))); + if (!mz_zip_reader_filename_less(pCentral_dir, pCentral_dir_offsets, pIndices[root], pIndices[child])) + break; + MZ_SWAP_UINT32(pIndices[root], pIndices[child]); root = child; + } + start--; + } + + end = size - 1; + while (end > 0) + { + int child, root = 0; + MZ_SWAP_UINT32(pIndices[end], pIndices[0]); + for ( ; ; ) + { + if ((child = (root << 1) + 1) >= end) + break; + child += (((child + 1) < end) && mz_zip_reader_filename_less(pCentral_dir, pCentral_dir_offsets, pIndices[child], pIndices[child + 1])); + if (!mz_zip_reader_filename_less(pCentral_dir, pCentral_dir_offsets, pIndices[root], pIndices[child])) + break; + MZ_SWAP_UINT32(pIndices[root], pIndices[child]); root = child; + } + end--; + } +} + +static mz_bool mz_zip_reader_read_central_dir(mz_zip_archive *pZip, mz_uint32 flags) +{ + mz_uint cdir_size, num_this_disk, cdir_disk_index; + mz_uint64 cdir_ofs; + mz_int64 cur_file_ofs; + const mz_uint8 *p; + mz_uint32 buf_u32[4096 / sizeof(mz_uint32)]; mz_uint8 *pBuf = (mz_uint8 *)buf_u32; + // Basic sanity checks - reject files which are too small, and check the first 4 bytes of the file to make sure a local header is there. + if (pZip->m_archive_size < MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIZE) + return MZ_FALSE; + // Find the end of central directory record by scanning the file from the end towards the beginning. + cur_file_ofs = MZ_MAX((mz_int64)pZip->m_archive_size - (mz_int64)sizeof(buf_u32), 0); + for ( ; ; ) + { + int i, n = (int)MZ_MIN(sizeof(buf_u32), pZip->m_archive_size - cur_file_ofs); + if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pBuf, n) != (mz_uint)n) + return MZ_FALSE; + for (i = n - 4; i >= 0; --i) + if (MZ_READ_LE32(pBuf + i) == MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIG) + break; + if (i >= 0) + { + cur_file_ofs += i; + break; + } + if ((!cur_file_ofs) || ((pZip->m_archive_size - cur_file_ofs) >= (0xFFFF + MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIZE))) + return MZ_FALSE; + cur_file_ofs = MZ_MAX(cur_file_ofs - (sizeof(buf_u32) - 3), 0); + } + // Read and verify the end of central directory record. + if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pBuf, MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIZE) != MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIZE) + return MZ_FALSE; + if ((MZ_READ_LE32(pBuf + MZ_ZIP_ECDH_SIG_OFS) != MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIG) || + ((pZip->m_total_files = MZ_READ_LE16(pBuf + MZ_ZIP_ECDH_CDIR_TOTAL_ENTRIES_OFS)) != MZ_READ_LE16(pBuf + MZ_ZIP_ECDH_CDIR_NUM_ENTRIES_ON_DISK_OFS))) + return MZ_FALSE; + + num_this_disk = MZ_READ_LE16(pBuf + MZ_ZIP_ECDH_NUM_THIS_DISK_OFS); + cdir_disk_index = MZ_READ_LE16(pBuf + MZ_ZIP_ECDH_NUM_DISK_CDIR_OFS); + if (((num_this_disk | cdir_disk_index) != 0) && ((num_this_disk != 1) || (cdir_disk_index != 1))) + return MZ_FALSE; + + if ((cdir_size = MZ_READ_LE32(pBuf + MZ_ZIP_ECDH_CDIR_SIZE_OFS)) < pZip->m_total_files * MZ_ZIP_CENTRAL_DIR_HEADER_SIZE) + return MZ_FALSE; + + cdir_ofs = MZ_READ_LE32(pBuf + MZ_ZIP_ECDH_CDIR_OFS_OFS); + if ((cdir_ofs + (mz_uint64)cdir_size) > pZip->m_archive_size) + return MZ_FALSE; + + pZip->m_central_directory_file_ofs = cdir_ofs; + + if (pZip->m_total_files) + { + mz_uint i, n; + // Read the entire central directory into a heap block, and allocate another heap block to hold the unsorted central dir file record offsets, and another to hold the sorted indices. + if ((!mz_zip_array_resize(pZip, &pZip->m_pState->m_central_dir, cdir_size, MZ_FALSE)) || + (!mz_zip_array_resize(pZip, &pZip->m_pState->m_central_dir_offsets, pZip->m_total_files, MZ_FALSE)) || + (!mz_zip_array_resize(pZip, &pZip->m_pState->m_sorted_central_dir_offsets, pZip->m_total_files, MZ_FALSE))) + return MZ_FALSE; + if (pZip->m_pRead(pZip->m_pIO_opaque, cdir_ofs, pZip->m_pState->m_central_dir.m_p, cdir_size) != cdir_size) + return MZ_FALSE; + + // Now create an index into the central directory file records, do some basic sanity checking on each record, and check for zip64 entries (which are not yet supported). + p = (const mz_uint8 *)pZip->m_pState->m_central_dir.m_p; + for (n = cdir_size, i = 0; i < pZip->m_total_files; ++i) + { + mz_uint total_header_size, comp_size, decomp_size, disk_index; + if ((n < MZ_ZIP_CENTRAL_DIR_HEADER_SIZE) || (MZ_READ_LE32(p) != MZ_ZIP_CENTRAL_DIR_HEADER_SIG)) + return MZ_FALSE; + MZ_ZIP_ARRAY_ELEMENT(&pZip->m_pState->m_central_dir_offsets, mz_uint32, i) = (mz_uint32)(p - (const mz_uint8 *)pZip->m_pState->m_central_dir.m_p); + MZ_ZIP_ARRAY_ELEMENT(&pZip->m_pState->m_sorted_central_dir_offsets, mz_uint32, i) = i; + comp_size = MZ_READ_LE32(p + MZ_ZIP_CDH_COMPRESSED_SIZE_OFS); + decomp_size = MZ_READ_LE32(p + MZ_ZIP_CDH_DECOMPRESSED_SIZE_OFS); + if (((!MZ_READ_LE32(p + MZ_ZIP_CDH_METHOD_OFS)) && (decomp_size != comp_size)) || (decomp_size && !comp_size) || (decomp_size == 0xFFFFFFFF) || (comp_size == 0xFFFFFFFF)) + return MZ_FALSE; + disk_index = MZ_READ_LE16(p + MZ_ZIP_CDH_DISK_START_OFS); + if ((disk_index != num_this_disk) && (disk_index != 1)) + return MZ_FALSE; + if (((mz_uint64)MZ_READ_LE32(p + MZ_ZIP_CDH_LOCAL_HEADER_OFS) + MZ_ZIP_LOCAL_DIR_HEADER_SIZE + comp_size) > pZip->m_archive_size) + return MZ_FALSE; + if ((total_header_size = MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + MZ_READ_LE16(p + MZ_ZIP_CDH_FILENAME_LEN_OFS) + MZ_READ_LE16(p + MZ_ZIP_CDH_EXTRA_LEN_OFS) + MZ_READ_LE16(p + MZ_ZIP_CDH_COMMENT_LEN_OFS)) > n) + return MZ_FALSE; + n -= total_header_size; p += total_header_size; + } + } + + if ((flags & MZ_ZIP_FLAG_DO_NOT_SORT_CENTRAL_DIRECTORY) == 0) + mz_zip_reader_sort_central_dir_offsets_by_filename(pZip); + + return MZ_TRUE; +} + +mz_bool mz_zip_reader_init(mz_zip_archive *pZip, mz_uint64 size, mz_uint32 flags) +{ + if ((!pZip) || (!pZip->m_pRead)) + return MZ_FALSE; + if (!mz_zip_reader_init_internal(pZip, flags)) + return MZ_FALSE; + pZip->m_archive_size = size; + if (!mz_zip_reader_read_central_dir(pZip, flags)) + { + mz_zip_reader_end(pZip); + return MZ_FALSE; + } + return MZ_TRUE; +} + +static size_t mz_zip_mem_read_func(void *pOpaque, mz_uint64 file_ofs, void *pBuf, size_t n) +{ + mz_zip_archive *pZip = (mz_zip_archive *)pOpaque; + size_t s = (file_ofs >= pZip->m_archive_size) ? 0 : (size_t)MZ_MIN(pZip->m_archive_size - file_ofs, n); + memcpy(pBuf, (const mz_uint8 *)pZip->m_pState->m_pMem + file_ofs, s); + return s; +} + +mz_bool mz_zip_reader_init_mem(mz_zip_archive *pZip, const void *pMem, size_t size, mz_uint32 flags) +{ + if (!mz_zip_reader_init_internal(pZip, flags)) + return MZ_FALSE; + pZip->m_archive_size = size; + pZip->m_pRead = mz_zip_mem_read_func; + pZip->m_pIO_opaque = pZip; + pZip->m_pState->m_pMem = (void *)pMem; + pZip->m_pState->m_mem_size = size; + if (!mz_zip_reader_read_central_dir(pZip, flags)) + { + mz_zip_reader_end(pZip); + return MZ_FALSE; + } + return MZ_TRUE; +} + +#ifndef MINIZ_NO_STDIO +static size_t mz_zip_file_read_func(void *pOpaque, mz_uint64 file_ofs, void *pBuf, size_t n) +{ + mz_zip_archive *pZip = (mz_zip_archive *)pOpaque; + mz_int64 cur_ofs = MZ_FTELL64(pZip->m_pState->m_pFile); + if (((mz_int64)file_ofs < 0) || (((cur_ofs != (mz_int64)file_ofs)) && (MZ_FSEEK64(pZip->m_pState->m_pFile, (mz_int64)file_ofs, SEEK_SET)))) + return 0; + return MZ_FREAD(pBuf, 1, n, pZip->m_pState->m_pFile); +} + +mz_bool mz_zip_reader_init_file(mz_zip_archive *pZip, const char *pFilename, mz_uint32 flags) +{ + mz_uint64 file_size; + MZ_FILE *pFile = MZ_FOPEN(pFilename, "rb"); + if (!pFile) + return MZ_FALSE; + if (MZ_FSEEK64(pFile, 0, SEEK_END)) + return MZ_FALSE; + file_size = MZ_FTELL64(pFile); + if (!mz_zip_reader_init_internal(pZip, flags)) + { + MZ_FCLOSE(pFile); + return MZ_FALSE; + } + pZip->m_pRead = mz_zip_file_read_func; + pZip->m_pIO_opaque = pZip; + pZip->m_pState->m_pFile = pFile; + pZip->m_archive_size = file_size; + if (!mz_zip_reader_read_central_dir(pZip, flags)) + { + mz_zip_reader_end(pZip); + return MZ_FALSE; + } + return MZ_TRUE; +} +#endif // #ifndef MINIZ_NO_STDIO + +mz_uint mz_zip_reader_get_num_files(mz_zip_archive *pZip) +{ + return pZip ? pZip->m_total_files : 0; +} + +static MZ_FORCEINLINE const mz_uint8 *mz_zip_reader_get_cdh(mz_zip_archive *pZip, mz_uint file_index) +{ + if ((!pZip) || (!pZip->m_pState) || (file_index >= pZip->m_total_files) || (pZip->m_zip_mode != MZ_ZIP_MODE_READING)) + return NULL; + return &MZ_ZIP_ARRAY_ELEMENT(&pZip->m_pState->m_central_dir, mz_uint8, MZ_ZIP_ARRAY_ELEMENT(&pZip->m_pState->m_central_dir_offsets, mz_uint32, file_index)); +} + +mz_bool mz_zip_reader_is_file_encrypted(mz_zip_archive *pZip, mz_uint file_index) +{ + mz_uint m_bit_flag; + const mz_uint8 *p = mz_zip_reader_get_cdh(pZip, file_index); + if (!p) + return MZ_FALSE; + m_bit_flag = MZ_READ_LE16(p + MZ_ZIP_CDH_BIT_FLAG_OFS); + return (m_bit_flag & 1); +} + +mz_bool mz_zip_reader_is_file_a_directory(mz_zip_archive *pZip, mz_uint file_index) +{ + mz_uint filename_len, internal_attr, external_attr; + const mz_uint8 *p = mz_zip_reader_get_cdh(pZip, file_index); + if (!p) + return MZ_FALSE; + + internal_attr = MZ_READ_LE16(p + MZ_ZIP_CDH_INTERNAL_ATTR_OFS); + external_attr = MZ_READ_LE32(p + MZ_ZIP_CDH_EXTERNAL_ATTR_OFS); + if ((!internal_attr) && ((external_attr & 0x10) != 0)) + return MZ_TRUE; + + filename_len = MZ_READ_LE16(p + MZ_ZIP_CDH_FILENAME_LEN_OFS); + if (filename_len) + { + if (*(p + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + filename_len - 1) == '/') + return MZ_TRUE; + } + + return MZ_FALSE; +} + +mz_bool mz_zip_reader_file_stat(mz_zip_archive *pZip, mz_uint file_index, mz_zip_archive_file_stat *pStat) +{ + mz_uint n; + const mz_uint8 *p = mz_zip_reader_get_cdh(pZip, file_index); + if ((!p) || (!pStat)) + return MZ_FALSE; + + // Unpack the central directory record. + pStat->m_file_index = file_index; + pStat->m_central_dir_ofs = MZ_ZIP_ARRAY_ELEMENT(&pZip->m_pState->m_central_dir_offsets, mz_uint32, file_index); + pStat->m_version_made_by = MZ_READ_LE16(p + MZ_ZIP_CDH_VERSION_MADE_BY_OFS); + pStat->m_version_needed = MZ_READ_LE16(p + MZ_ZIP_CDH_VERSION_NEEDED_OFS); + pStat->m_bit_flag = MZ_READ_LE16(p + MZ_ZIP_CDH_BIT_FLAG_OFS); + pStat->m_method = MZ_READ_LE16(p + MZ_ZIP_CDH_METHOD_OFS); +#ifndef MINIZ_NO_TIME + pStat->m_time = mz_zip_dos_to_time_t(MZ_READ_LE16(p + MZ_ZIP_CDH_FILE_TIME_OFS), MZ_READ_LE16(p + MZ_ZIP_CDH_FILE_DATE_OFS)); +#endif + pStat->m_crc32 = MZ_READ_LE32(p + MZ_ZIP_CDH_CRC32_OFS); + pStat->m_comp_size = MZ_READ_LE32(p + MZ_ZIP_CDH_COMPRESSED_SIZE_OFS); + pStat->m_uncomp_size = MZ_READ_LE32(p + MZ_ZIP_CDH_DECOMPRESSED_SIZE_OFS); + pStat->m_internal_attr = MZ_READ_LE16(p + MZ_ZIP_CDH_INTERNAL_ATTR_OFS); + pStat->m_external_attr = MZ_READ_LE32(p + MZ_ZIP_CDH_EXTERNAL_ATTR_OFS); + pStat->m_local_header_ofs = MZ_READ_LE32(p + MZ_ZIP_CDH_LOCAL_HEADER_OFS); + + // Copy as much of the filename and comment as possible. + n = MZ_READ_LE16(p + MZ_ZIP_CDH_FILENAME_LEN_OFS); n = MZ_MIN(n, MZ_ZIP_MAX_ARCHIVE_FILENAME_SIZE - 1); + memcpy(pStat->m_filename, p + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE, n); pStat->m_filename[n] = '\0'; + + n = MZ_READ_LE16(p + MZ_ZIP_CDH_COMMENT_LEN_OFS); n = MZ_MIN(n, MZ_ZIP_MAX_ARCHIVE_FILE_COMMENT_SIZE - 1); + pStat->m_comment_size = n; + memcpy(pStat->m_comment, p + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + MZ_READ_LE16(p + MZ_ZIP_CDH_FILENAME_LEN_OFS) + MZ_READ_LE16(p + MZ_ZIP_CDH_EXTRA_LEN_OFS), n); pStat->m_comment[n] = '\0'; + + return MZ_TRUE; +} + +mz_uint mz_zip_reader_get_filename(mz_zip_archive *pZip, mz_uint file_index, char *pFilename, mz_uint filename_buf_size) +{ + mz_uint n; + const mz_uint8 *p = mz_zip_reader_get_cdh(pZip, file_index); + if (!p) { if (filename_buf_size) pFilename[0] = '\0'; return 0; } + n = MZ_READ_LE16(p + MZ_ZIP_CDH_FILENAME_LEN_OFS); + if (filename_buf_size) + { + n = MZ_MIN(n, filename_buf_size - 1); + memcpy(pFilename, p + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE, n); + pFilename[n] = '\0'; + } + return n + 1; +} + +static MZ_FORCEINLINE mz_bool mz_zip_reader_string_equal(const char *pA, const char *pB, mz_uint len, mz_uint flags) +{ + mz_uint i; + if (flags & MZ_ZIP_FLAG_CASE_SENSITIVE) + return 0 == memcmp(pA, pB, len); + for (i = 0; i < len; ++i) + if (MZ_TOLOWER(pA[i]) != MZ_TOLOWER(pB[i])) + return MZ_FALSE; + return MZ_TRUE; +} + +static MZ_FORCEINLINE int mz_zip_reader_filename_compare(const mz_zip_array *pCentral_dir_array, const mz_zip_array *pCentral_dir_offsets, mz_uint l_index, const char *pR, mz_uint r_len) +{ + const mz_uint8 *pL = &MZ_ZIP_ARRAY_ELEMENT(pCentral_dir_array, mz_uint8, MZ_ZIP_ARRAY_ELEMENT(pCentral_dir_offsets, mz_uint32, l_index)), *pE; + mz_uint l_len = MZ_READ_LE16(pL + MZ_ZIP_CDH_FILENAME_LEN_OFS); + mz_uint8 l = 0, r = 0; + pL += MZ_ZIP_CENTRAL_DIR_HEADER_SIZE; + pE = pL + MZ_MIN(l_len, r_len); + while (pL < pE) + { + if ((l = MZ_TOLOWER(*pL)) != (r = MZ_TOLOWER(*pR))) + break; + pL++; pR++; + } + return (pL == pE) ? (int)(l_len - r_len) : (l - r); +} + +static int mz_zip_reader_locate_file_binary_search(mz_zip_archive *pZip, const char *pFilename) +{ + mz_zip_internal_state *pState = pZip->m_pState; + const mz_zip_array *pCentral_dir_offsets = &pState->m_central_dir_offsets; + const mz_zip_array *pCentral_dir = &pState->m_central_dir; + mz_uint32 *pIndices = &MZ_ZIP_ARRAY_ELEMENT(&pState->m_sorted_central_dir_offsets, mz_uint32, 0); + const int size = pZip->m_total_files; + const mz_uint filename_len = (mz_uint)strlen(pFilename); + int l = 0, h = size - 1; + while (l <= h) + { + int m = (l + h) >> 1, file_index = pIndices[m], comp = mz_zip_reader_filename_compare(pCentral_dir, pCentral_dir_offsets, file_index, pFilename, filename_len); + if (!comp) + return file_index; + else if (comp < 0) + l = m + 1; + else + h = m - 1; + } + return -1; +} + +int mz_zip_reader_locate_file(mz_zip_archive *pZip, const char *pName, const char *pComment, mz_uint flags) +{ + mz_uint file_index; size_t name_len, comment_len; + if ((!pZip) || (!pZip->m_pState) || (!pName) || (pZip->m_zip_mode != MZ_ZIP_MODE_READING)) + return -1; + if (((flags & (MZ_ZIP_FLAG_IGNORE_PATH | MZ_ZIP_FLAG_CASE_SENSITIVE)) == 0) && (!pComment) && (pZip->m_pState->m_sorted_central_dir_offsets.m_p)) + return mz_zip_reader_locate_file_binary_search(pZip, pName); + name_len = strlen(pName); if (name_len > 0xFFFF) return -1; + comment_len = pComment ? strlen(pComment) : 0; if (comment_len > 0xFFFF) return -1; + for (file_index = 0; file_index < pZip->m_total_files; file_index++) + { + const mz_uint8 *pHeader = &MZ_ZIP_ARRAY_ELEMENT(&pZip->m_pState->m_central_dir, mz_uint8, MZ_ZIP_ARRAY_ELEMENT(&pZip->m_pState->m_central_dir_offsets, mz_uint32, file_index)); + mz_uint filename_len = MZ_READ_LE16(pHeader + MZ_ZIP_CDH_FILENAME_LEN_OFS); + const char *pFilename = (const char *)pHeader + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE; + if (filename_len < name_len) + continue; + if (comment_len) + { + mz_uint file_extra_len = MZ_READ_LE16(pHeader + MZ_ZIP_CDH_EXTRA_LEN_OFS), file_comment_len = MZ_READ_LE16(pHeader + MZ_ZIP_CDH_COMMENT_LEN_OFS); + const char *pFile_comment = pFilename + filename_len + file_extra_len; + if ((file_comment_len != comment_len) || (!mz_zip_reader_string_equal(pComment, pFile_comment, file_comment_len, flags))) + continue; + } + if ((flags & MZ_ZIP_FLAG_IGNORE_PATH) && (filename_len)) + { + int ofs = filename_len - 1; + do + { + if ((pFilename[ofs] == '/') || (pFilename[ofs] == '\\') || (pFilename[ofs] == ':')) + break; + } while (--ofs >= 0); + ofs++; + pFilename += ofs; filename_len -= ofs; + } + if ((filename_len == name_len) && (mz_zip_reader_string_equal(pName, pFilename, filename_len, flags))) + return file_index; + } + return -1; +} + +mz_bool mz_zip_reader_extract_to_mem_no_alloc(mz_zip_archive *pZip, mz_uint file_index, void *pBuf, size_t buf_size, mz_uint flags, void *pUser_read_buf, size_t user_read_buf_size) +{ + int status = TINFL_STATUS_DONE; + mz_uint64 needed_size, cur_file_ofs, comp_remaining, out_buf_ofs = 0, read_buf_size, read_buf_ofs = 0, read_buf_avail; + mz_zip_archive_file_stat file_stat; + void *pRead_buf; + mz_uint32 local_header_u32[(MZ_ZIP_LOCAL_DIR_HEADER_SIZE + sizeof(mz_uint32) - 1) / sizeof(mz_uint32)]; mz_uint8 *pLocal_header = (mz_uint8 *)local_header_u32; + tinfl_decompressor inflator; + + if ((buf_size) && (!pBuf)) + return MZ_FALSE; + + if (!mz_zip_reader_file_stat(pZip, file_index, &file_stat)) + return MZ_FALSE; + + if (!file_stat.m_comp_size) + return MZ_TRUE; + + // Encryption and patch files are not supported. + if (file_stat.m_bit_flag & (1 | 32)) + return MZ_FALSE; + + // This function only supports stored and deflate. + if ((!(flags & MZ_ZIP_FLAG_COMPRESSED_DATA)) && (file_stat.m_method != 0) && (file_stat.m_method != MZ_DEFLATED)) + return MZ_FALSE; + + // Ensure supplied output buffer is large enough. + needed_size = (flags & MZ_ZIP_FLAG_COMPRESSED_DATA) ? file_stat.m_comp_size : file_stat.m_uncomp_size; + if (buf_size < needed_size) + return MZ_FALSE; + + // Read and parse the local directory entry. + cur_file_ofs = file_stat.m_local_header_ofs; + if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pLocal_header, MZ_ZIP_LOCAL_DIR_HEADER_SIZE) != MZ_ZIP_LOCAL_DIR_HEADER_SIZE) + return MZ_FALSE; + if (MZ_READ_LE32(pLocal_header) != MZ_ZIP_LOCAL_DIR_HEADER_SIG) + return MZ_FALSE; + + cur_file_ofs += MZ_ZIP_LOCAL_DIR_HEADER_SIZE + MZ_READ_LE16(pLocal_header + MZ_ZIP_LDH_FILENAME_LEN_OFS) + MZ_READ_LE16(pLocal_header + MZ_ZIP_LDH_EXTRA_LEN_OFS); + if ((cur_file_ofs + file_stat.m_comp_size) > pZip->m_archive_size) + return MZ_FALSE; + + if ((flags & MZ_ZIP_FLAG_COMPRESSED_DATA) || (!file_stat.m_method)) + { + // The file is stored or the caller has requested the compressed data. + if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pBuf, (size_t)needed_size) != needed_size) + return MZ_FALSE; + return ((flags & MZ_ZIP_FLAG_COMPRESSED_DATA) != 0) || (mz_crc32(MZ_CRC32_INIT, (const mz_uint8 *)pBuf, (size_t)file_stat.m_uncomp_size) == file_stat.m_crc32); + } + + // Decompress the file either directly from memory or from a file input buffer. + tinfl_init(&inflator); + + if (pZip->m_pState->m_pMem) + { + // Read directly from the archive in memory. + pRead_buf = (mz_uint8 *)pZip->m_pState->m_pMem + cur_file_ofs; + read_buf_size = read_buf_avail = file_stat.m_comp_size; + comp_remaining = 0; + } + else if (pUser_read_buf) + { + // Use a user provided read buffer. + if (!user_read_buf_size) + return MZ_FALSE; + pRead_buf = (mz_uint8 *)pUser_read_buf; + read_buf_size = user_read_buf_size; + read_buf_avail = 0; + comp_remaining = file_stat.m_uncomp_size; + } + else + { + // Temporarily allocate a read buffer. + read_buf_size = MZ_MIN(file_stat.m_comp_size, MZ_ZIP_MAX_IO_BUF_SIZE); +#ifdef _MSC_VER + if (((0, sizeof(size_t) == sizeof(mz_uint32))) && (read_buf_size > 0x7FFFFFFF)) +#else + if (((sizeof(size_t) == sizeof(mz_uint32))) && (read_buf_size > 0x7FFFFFFF)) +#endif + return MZ_FALSE; + if (NULL == (pRead_buf = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, (size_t)read_buf_size))) + return MZ_FALSE; + read_buf_avail = 0; + comp_remaining = file_stat.m_comp_size; + } + + do + { + size_t in_buf_size, out_buf_size = (size_t)(file_stat.m_uncomp_size - out_buf_ofs); + if ((!read_buf_avail) && (!pZip->m_pState->m_pMem)) + { + read_buf_avail = MZ_MIN(read_buf_size, comp_remaining); + if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pRead_buf, (size_t)read_buf_avail) != read_buf_avail) + { + status = TINFL_STATUS_FAILED; + break; + } + cur_file_ofs += read_buf_avail; + comp_remaining -= read_buf_avail; + read_buf_ofs = 0; + } + in_buf_size = (size_t)read_buf_avail; + status = tinfl_decompress(&inflator, (mz_uint8 *)pRead_buf + read_buf_ofs, &in_buf_size, (mz_uint8 *)pBuf, (mz_uint8 *)pBuf + out_buf_ofs, &out_buf_size, TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF | (comp_remaining ? TINFL_FLAG_HAS_MORE_INPUT : 0)); + read_buf_avail -= in_buf_size; + read_buf_ofs += in_buf_size; + out_buf_ofs += out_buf_size; + } while (status == TINFL_STATUS_NEEDS_MORE_INPUT); + + if (status == TINFL_STATUS_DONE) + { + // Make sure the entire file was decompressed, and check its CRC. + if ((out_buf_ofs != file_stat.m_uncomp_size) || (mz_crc32(MZ_CRC32_INIT, (const mz_uint8 *)pBuf, (size_t)file_stat.m_uncomp_size) != file_stat.m_crc32)) + status = TINFL_STATUS_FAILED; + } + + if ((!pZip->m_pState->m_pMem) && (!pUser_read_buf)) + pZip->m_pFree(pZip->m_pAlloc_opaque, pRead_buf); + + return status == TINFL_STATUS_DONE; +} + +mz_bool mz_zip_reader_extract_file_to_mem_no_alloc(mz_zip_archive *pZip, const char *pFilename, void *pBuf, size_t buf_size, mz_uint flags, void *pUser_read_buf, size_t user_read_buf_size) +{ + int file_index = mz_zip_reader_locate_file(pZip, pFilename, NULL, flags); + if (file_index < 0) + return MZ_FALSE; + return mz_zip_reader_extract_to_mem_no_alloc(pZip, file_index, pBuf, buf_size, flags, pUser_read_buf, user_read_buf_size); +} + +mz_bool mz_zip_reader_extract_to_mem(mz_zip_archive *pZip, mz_uint file_index, void *pBuf, size_t buf_size, mz_uint flags) +{ + return mz_zip_reader_extract_to_mem_no_alloc(pZip, file_index, pBuf, buf_size, flags, NULL, 0); +} + +mz_bool mz_zip_reader_extract_file_to_mem(mz_zip_archive *pZip, const char *pFilename, void *pBuf, size_t buf_size, mz_uint flags) +{ + return mz_zip_reader_extract_file_to_mem_no_alloc(pZip, pFilename, pBuf, buf_size, flags, NULL, 0); +} + +void *mz_zip_reader_extract_to_heap(mz_zip_archive *pZip, mz_uint file_index, size_t *pSize, mz_uint flags) +{ + mz_uint64 comp_size, uncomp_size, alloc_size; + const mz_uint8 *p = mz_zip_reader_get_cdh(pZip, file_index); + void *pBuf; + + if (pSize) + *pSize = 0; + if (!p) + return NULL; + + comp_size = MZ_READ_LE32(p + MZ_ZIP_CDH_COMPRESSED_SIZE_OFS); + uncomp_size = MZ_READ_LE32(p + MZ_ZIP_CDH_DECOMPRESSED_SIZE_OFS); + + alloc_size = (flags & MZ_ZIP_FLAG_COMPRESSED_DATA) ? comp_size : uncomp_size; +#ifdef _MSC_VER + if (((0, sizeof(size_t) == sizeof(mz_uint32))) && (alloc_size > 0x7FFFFFFF)) +#else + if (((sizeof(size_t) == sizeof(mz_uint32))) && (alloc_size > 0x7FFFFFFF)) +#endif + return NULL; + if (NULL == (pBuf = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, (size_t)alloc_size))) + return NULL; + + if (!mz_zip_reader_extract_to_mem(pZip, file_index, pBuf, (size_t)alloc_size, flags)) + { + pZip->m_pFree(pZip->m_pAlloc_opaque, pBuf); + return NULL; + } + + if (pSize) *pSize = (size_t)alloc_size; + return pBuf; +} + +void *mz_zip_reader_extract_file_to_heap(mz_zip_archive *pZip, const char *pFilename, size_t *pSize, mz_uint flags) +{ + int file_index = mz_zip_reader_locate_file(pZip, pFilename, NULL, flags); + if (file_index < 0) + { + if (pSize) *pSize = 0; + return MZ_FALSE; + } + return mz_zip_reader_extract_to_heap(pZip, file_index, pSize, flags); +} + +mz_bool mz_zip_reader_extract_to_callback(mz_zip_archive *pZip, mz_uint file_index, mz_file_write_func pCallback, void *pOpaque, mz_uint flags) +{ + int status = TINFL_STATUS_DONE; mz_uint file_crc32 = MZ_CRC32_INIT; + mz_uint64 read_buf_size, read_buf_ofs = 0, read_buf_avail, comp_remaining, out_buf_ofs = 0, cur_file_ofs; + mz_zip_archive_file_stat file_stat; + void *pRead_buf = NULL; void *pWrite_buf = NULL; + mz_uint32 local_header_u32[(MZ_ZIP_LOCAL_DIR_HEADER_SIZE + sizeof(mz_uint32) - 1) / sizeof(mz_uint32)]; mz_uint8 *pLocal_header = (mz_uint8 *)local_header_u32; + + if (!mz_zip_reader_file_stat(pZip, file_index, &file_stat)) + return MZ_FALSE; + + if (!file_stat.m_comp_size) + return MZ_TRUE; + + // Encryption and patch files are not supported. + if (file_stat.m_bit_flag & (1 | 32)) + return MZ_FALSE; + + // This function only supports stored and deflate. + if ((!(flags & MZ_ZIP_FLAG_COMPRESSED_DATA)) && (file_stat.m_method != 0) && (file_stat.m_method != MZ_DEFLATED)) + return MZ_FALSE; + + // Read and parse the local directory entry. + cur_file_ofs = file_stat.m_local_header_ofs; + if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pLocal_header, MZ_ZIP_LOCAL_DIR_HEADER_SIZE) != MZ_ZIP_LOCAL_DIR_HEADER_SIZE) + return MZ_FALSE; + if (MZ_READ_LE32(pLocal_header) != MZ_ZIP_LOCAL_DIR_HEADER_SIG) + return MZ_FALSE; + + cur_file_ofs += MZ_ZIP_LOCAL_DIR_HEADER_SIZE + MZ_READ_LE16(pLocal_header + MZ_ZIP_LDH_FILENAME_LEN_OFS) + MZ_READ_LE16(pLocal_header + MZ_ZIP_LDH_EXTRA_LEN_OFS); + if ((cur_file_ofs + file_stat.m_comp_size) > pZip->m_archive_size) + return MZ_FALSE; + + // Decompress the file either directly from memory or from a file input buffer. + if (pZip->m_pState->m_pMem) + { + pRead_buf = (mz_uint8 *)pZip->m_pState->m_pMem + cur_file_ofs; + read_buf_size = read_buf_avail = file_stat.m_comp_size; + comp_remaining = 0; + } + else + { + read_buf_size = MZ_MIN(file_stat.m_comp_size, MZ_ZIP_MAX_IO_BUF_SIZE); + if (NULL == (pRead_buf = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, (size_t)read_buf_size))) + return MZ_FALSE; + read_buf_avail = 0; + comp_remaining = file_stat.m_comp_size; + } + + if ((flags & MZ_ZIP_FLAG_COMPRESSED_DATA) || (!file_stat.m_method)) + { + // The file is stored or the caller has requested the compressed data. + if (pZip->m_pState->m_pMem) + { +#ifdef _MSC_VER + if (((0, sizeof(size_t) == sizeof(mz_uint32))) && (file_stat.m_comp_size > 0xFFFFFFFF)) +#else + if (((sizeof(size_t) == sizeof(mz_uint32))) && (file_stat.m_comp_size > 0xFFFFFFFF)) +#endif + return MZ_FALSE; + if (pCallback(pOpaque, out_buf_ofs, pRead_buf, (size_t)file_stat.m_comp_size) != file_stat.m_comp_size) + status = TINFL_STATUS_FAILED; + else if (!(flags & MZ_ZIP_FLAG_COMPRESSED_DATA)) + file_crc32 = (mz_uint32)mz_crc32(file_crc32, (const mz_uint8 *)pRead_buf, (size_t)file_stat.m_comp_size); + cur_file_ofs += file_stat.m_comp_size; + out_buf_ofs += file_stat.m_comp_size; + comp_remaining = 0; + } + else + { + while (comp_remaining) + { + read_buf_avail = MZ_MIN(read_buf_size, comp_remaining); + if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pRead_buf, (size_t)read_buf_avail) != read_buf_avail) + { + status = TINFL_STATUS_FAILED; + break; + } + + if (!(flags & MZ_ZIP_FLAG_COMPRESSED_DATA)) + file_crc32 = (mz_uint32)mz_crc32(file_crc32, (const mz_uint8 *)pRead_buf, (size_t)read_buf_avail); + + if (pCallback(pOpaque, out_buf_ofs, pRead_buf, (size_t)read_buf_avail) != read_buf_avail) + { + status = TINFL_STATUS_FAILED; + break; + } + cur_file_ofs += read_buf_avail; + out_buf_ofs += read_buf_avail; + comp_remaining -= read_buf_avail; + } + } + } + else + { + tinfl_decompressor inflator; + tinfl_init(&inflator); + + if (NULL == (pWrite_buf = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, TINFL_LZ_DICT_SIZE))) + status = TINFL_STATUS_FAILED; + else + { + do + { + mz_uint8 *pWrite_buf_cur = (mz_uint8 *)pWrite_buf + (out_buf_ofs & (TINFL_LZ_DICT_SIZE - 1)); + size_t in_buf_size, out_buf_size = TINFL_LZ_DICT_SIZE - (out_buf_ofs & (TINFL_LZ_DICT_SIZE - 1)); + if ((!read_buf_avail) && (!pZip->m_pState->m_pMem)) + { + read_buf_avail = MZ_MIN(read_buf_size, comp_remaining); + if (pZip->m_pRead(pZip->m_pIO_opaque, cur_file_ofs, pRead_buf, (size_t)read_buf_avail) != read_buf_avail) + { + status = TINFL_STATUS_FAILED; + break; + } + cur_file_ofs += read_buf_avail; + comp_remaining -= read_buf_avail; + read_buf_ofs = 0; + } + + in_buf_size = (size_t)read_buf_avail; + status = tinfl_decompress(&inflator, (const mz_uint8 *)pRead_buf + read_buf_ofs, &in_buf_size, (mz_uint8 *)pWrite_buf, pWrite_buf_cur, &out_buf_size, comp_remaining ? TINFL_FLAG_HAS_MORE_INPUT : 0); + read_buf_avail -= in_buf_size; + read_buf_ofs += in_buf_size; + + if (out_buf_size) + { + if (pCallback(pOpaque, out_buf_ofs, pWrite_buf_cur, out_buf_size) != out_buf_size) + { + status = TINFL_STATUS_FAILED; + break; + } + file_crc32 = (mz_uint32)mz_crc32(file_crc32, pWrite_buf_cur, out_buf_size); + if ((out_buf_ofs += out_buf_size) > file_stat.m_uncomp_size) + { + status = TINFL_STATUS_FAILED; + break; + } + } + } while ((status == TINFL_STATUS_NEEDS_MORE_INPUT) || (status == TINFL_STATUS_HAS_MORE_OUTPUT)); + } + } + + if ((status == TINFL_STATUS_DONE) && (!(flags & MZ_ZIP_FLAG_COMPRESSED_DATA))) + { + // Make sure the entire file was decompressed, and check its CRC. + if ((out_buf_ofs != file_stat.m_uncomp_size) || (file_crc32 != file_stat.m_crc32)) + status = TINFL_STATUS_FAILED; + } + + if (!pZip->m_pState->m_pMem) + pZip->m_pFree(pZip->m_pAlloc_opaque, pRead_buf); + if (pWrite_buf) + pZip->m_pFree(pZip->m_pAlloc_opaque, pWrite_buf); + + return status == TINFL_STATUS_DONE; +} + +mz_bool mz_zip_reader_extract_file_to_callback(mz_zip_archive *pZip, const char *pFilename, mz_file_write_func pCallback, void *pOpaque, mz_uint flags) +{ + int file_index = mz_zip_reader_locate_file(pZip, pFilename, NULL, flags); + if (file_index < 0) + return MZ_FALSE; + return mz_zip_reader_extract_to_callback(pZip, file_index, pCallback, pOpaque, flags); +} + +#ifndef MINIZ_NO_STDIO +static size_t mz_zip_file_write_callback(void *pOpaque, mz_uint64 ofs, const void *pBuf, size_t n) +{ + (void)ofs; return MZ_FWRITE(pBuf, 1, n, (MZ_FILE*)pOpaque); +} + +mz_bool mz_zip_reader_extract_to_file(mz_zip_archive *pZip, mz_uint file_index, const char *pDst_filename, mz_uint flags) +{ + mz_bool status; + mz_zip_archive_file_stat file_stat; + MZ_FILE *pFile; + if (!mz_zip_reader_file_stat(pZip, file_index, &file_stat)) + return MZ_FALSE; + pFile = MZ_FOPEN(pDst_filename, "wb"); + if (!pFile) + return MZ_FALSE; + status = mz_zip_reader_extract_to_callback(pZip, file_index, mz_zip_file_write_callback, pFile, flags); + if (MZ_FCLOSE(pFile) == EOF) + return MZ_FALSE; +#ifndef MINIZ_NO_TIME + if (status) + mz_zip_set_file_times(pDst_filename, file_stat.m_time, file_stat.m_time); +#endif + return status; +} +#endif // #ifndef MINIZ_NO_STDIO + +mz_bool mz_zip_reader_end(mz_zip_archive *pZip) +{ + if ((!pZip) || (!pZip->m_pState) || (!pZip->m_pAlloc) || (!pZip->m_pFree) || (pZip->m_zip_mode != MZ_ZIP_MODE_READING)) + return MZ_FALSE; + + if (pZip->m_pState) + { + mz_zip_internal_state *pState = pZip->m_pState; pZip->m_pState = NULL; + mz_zip_array_clear(pZip, &pState->m_central_dir); + mz_zip_array_clear(pZip, &pState->m_central_dir_offsets); + mz_zip_array_clear(pZip, &pState->m_sorted_central_dir_offsets); + +#ifndef MINIZ_NO_STDIO + if (pState->m_pFile) + { + MZ_FCLOSE(pState->m_pFile); + pState->m_pFile = NULL; + } +#endif // #ifndef MINIZ_NO_STDIO + + pZip->m_pFree(pZip->m_pAlloc_opaque, pState); + } + pZip->m_zip_mode = MZ_ZIP_MODE_INVALID; + + return MZ_TRUE; +} + +#ifndef MINIZ_NO_STDIO +mz_bool mz_zip_reader_extract_file_to_file(mz_zip_archive *pZip, const char *pArchive_filename, const char *pDst_filename, mz_uint flags) +{ + int file_index = mz_zip_reader_locate_file(pZip, pArchive_filename, NULL, flags); + if (file_index < 0) + return MZ_FALSE; + return mz_zip_reader_extract_to_file(pZip, file_index, pDst_filename, flags); +} +#endif + +// ------------------- .ZIP archive writing + +#ifndef MINIZ_NO_ARCHIVE_WRITING_APIS + +static void mz_write_le16(mz_uint8 *p, mz_uint16 v) { p[0] = (mz_uint8)v; p[1] = (mz_uint8)(v >> 8); } +static void mz_write_le32(mz_uint8 *p, mz_uint32 v) { p[0] = (mz_uint8)v; p[1] = (mz_uint8)(v >> 8); p[2] = (mz_uint8)(v >> 16); p[3] = (mz_uint8)(v >> 24); } +#define MZ_WRITE_LE16(p, v) mz_write_le16((mz_uint8 *)(p), (mz_uint16)(v)) +#define MZ_WRITE_LE32(p, v) mz_write_le32((mz_uint8 *)(p), (mz_uint32)(v)) + +mz_bool mz_zip_writer_init(mz_zip_archive *pZip, mz_uint64 existing_size) +{ + if ((!pZip) || (pZip->m_pState) || (!pZip->m_pWrite) || (pZip->m_zip_mode != MZ_ZIP_MODE_INVALID)) + return MZ_FALSE; + + if (pZip->m_file_offset_alignment) + { + // Ensure user specified file offset alignment is a power of 2. + if (pZip->m_file_offset_alignment & (pZip->m_file_offset_alignment - 1)) + return MZ_FALSE; + } + + if (!pZip->m_pAlloc) pZip->m_pAlloc = def_alloc_func; + if (!pZip->m_pFree) pZip->m_pFree = def_free_func; + if (!pZip->m_pRealloc) pZip->m_pRealloc = def_realloc_func; + + pZip->m_zip_mode = MZ_ZIP_MODE_WRITING; + pZip->m_archive_size = existing_size; + pZip->m_central_directory_file_ofs = 0; + pZip->m_total_files = 0; + + if (NULL == (pZip->m_pState = (mz_zip_internal_state *)pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, sizeof(mz_zip_internal_state)))) + return MZ_FALSE; + memset(pZip->m_pState, 0, sizeof(mz_zip_internal_state)); + MZ_ZIP_ARRAY_SET_ELEMENT_SIZE(&pZip->m_pState->m_central_dir, sizeof(mz_uint8)); + MZ_ZIP_ARRAY_SET_ELEMENT_SIZE(&pZip->m_pState->m_central_dir_offsets, sizeof(mz_uint32)); + MZ_ZIP_ARRAY_SET_ELEMENT_SIZE(&pZip->m_pState->m_sorted_central_dir_offsets, sizeof(mz_uint32)); + return MZ_TRUE; +} + +static size_t mz_zip_heap_write_func(void *pOpaque, mz_uint64 file_ofs, const void *pBuf, size_t n) +{ + mz_zip_archive *pZip = (mz_zip_archive *)pOpaque; + mz_zip_internal_state *pState = pZip->m_pState; + mz_uint64 new_size = MZ_MAX(file_ofs + n, pState->m_mem_size); +#ifdef _MSC_VER + if ((!n) || ((0, sizeof(size_t) == sizeof(mz_uint32)) && (new_size > 0x7FFFFFFF))) +#else + if ((!n) || ((sizeof(size_t) == sizeof(mz_uint32)) && (new_size > 0x7FFFFFFF))) +#endif + return 0; + if (new_size > pState->m_mem_capacity) + { + void *pNew_block; + size_t new_capacity = MZ_MAX(64, pState->m_mem_capacity); while (new_capacity < new_size) new_capacity *= 2; + if (NULL == (pNew_block = pZip->m_pRealloc(pZip->m_pAlloc_opaque, pState->m_pMem, 1, new_capacity))) + return 0; + pState->m_pMem = pNew_block; pState->m_mem_capacity = new_capacity; + } + memcpy((mz_uint8 *)pState->m_pMem + file_ofs, pBuf, n); + pState->m_mem_size = (size_t)new_size; + return n; +} + +mz_bool mz_zip_writer_init_heap(mz_zip_archive *pZip, size_t size_to_reserve_at_beginning, size_t initial_allocation_size) +{ + pZip->m_pWrite = mz_zip_heap_write_func; + pZip->m_pIO_opaque = pZip; + if (!mz_zip_writer_init(pZip, size_to_reserve_at_beginning)) + return MZ_FALSE; + if (0 != (initial_allocation_size = MZ_MAX(initial_allocation_size, size_to_reserve_at_beginning))) + { + if (NULL == (pZip->m_pState->m_pMem = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, initial_allocation_size))) + { + mz_zip_writer_end(pZip); + return MZ_FALSE; + } + pZip->m_pState->m_mem_capacity = initial_allocation_size; + } + return MZ_TRUE; +} + +#ifndef MINIZ_NO_STDIO +static size_t mz_zip_file_write_func(void *pOpaque, mz_uint64 file_ofs, const void *pBuf, size_t n) +{ + mz_zip_archive *pZip = (mz_zip_archive *)pOpaque; + mz_int64 cur_ofs = MZ_FTELL64(pZip->m_pState->m_pFile); + if (((mz_int64)file_ofs < 0) || (((cur_ofs != (mz_int64)file_ofs)) && (MZ_FSEEK64(pZip->m_pState->m_pFile, (mz_int64)file_ofs, SEEK_SET)))) + return 0; + return MZ_FWRITE(pBuf, 1, n, pZip->m_pState->m_pFile); +} + +mz_bool mz_zip_writer_init_file(mz_zip_archive *pZip, const char *pFilename, mz_uint64 size_to_reserve_at_beginning) +{ + MZ_FILE *pFile; + pZip->m_pWrite = mz_zip_file_write_func; + pZip->m_pIO_opaque = pZip; + if (!mz_zip_writer_init(pZip, size_to_reserve_at_beginning)) + return MZ_FALSE; + if (NULL == (pFile = MZ_FOPEN(pFilename, "wb"))) + { + mz_zip_writer_end(pZip); + return MZ_FALSE; + } + pZip->m_pState->m_pFile = pFile; + if (size_to_reserve_at_beginning) + { + mz_uint64 cur_ofs = 0; char buf[4096]; MZ_CLEAR_OBJ(buf); + do + { + size_t n = (size_t)MZ_MIN(sizeof(buf), size_to_reserve_at_beginning); + if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_ofs, buf, n) != n) + { + mz_zip_writer_end(pZip); + return MZ_FALSE; + } + cur_ofs += n; size_to_reserve_at_beginning -= n; + } while (size_to_reserve_at_beginning); + } + return MZ_TRUE; +} +#endif // #ifndef MINIZ_NO_STDIO + +mz_bool mz_zip_writer_init_from_reader(mz_zip_archive *pZip, const char *pFilename) +{ + mz_zip_internal_state *pState; + if ((!pZip) || (!pZip->m_pState) || (pZip->m_zip_mode != MZ_ZIP_MODE_READING)) + return MZ_FALSE; + // No sense in trying to write to an archive that's already at the support max size + if ((pZip->m_total_files == 0xFFFF) || ((pZip->m_archive_size + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + MZ_ZIP_LOCAL_DIR_HEADER_SIZE) > 0xFFFFFFFF)) + return MZ_FALSE; + + pState = pZip->m_pState; + + if (pState->m_pFile) + { +#ifdef MINIZ_NO_STDIO + pFilename; return MZ_FALSE; +#else + // Archive is being read from stdio - try to reopen as writable. + if (pZip->m_pIO_opaque != pZip) + return MZ_FALSE; + if (!pFilename) + return MZ_FALSE; + pZip->m_pWrite = mz_zip_file_write_func; + if (NULL == (pState->m_pFile = MZ_FREOPEN(pFilename, "r+b", pState->m_pFile))) + { + // The mz_zip_archive is now in a bogus state because pState->m_pFile is NULL, so just close it. + mz_zip_reader_end(pZip); + return MZ_FALSE; + } +#endif // #ifdef MINIZ_NO_STDIO + } + else if (pState->m_pMem) + { + // Archive lives in a memory block. Assume it's from the heap that we can resize using the realloc callback. + if (pZip->m_pIO_opaque != pZip) + return MZ_FALSE; + pState->m_mem_capacity = pState->m_mem_size; + pZip->m_pWrite = mz_zip_heap_write_func; + } + // Archive is being read via a user provided read function - make sure the user has specified a write function too. + else if (!pZip->m_pWrite) + return MZ_FALSE; + + // Start writing new files at the archive's current central directory location. + pZip->m_archive_size = pZip->m_central_directory_file_ofs; + pZip->m_zip_mode = MZ_ZIP_MODE_WRITING; + pZip->m_central_directory_file_ofs = 0; + + return MZ_TRUE; +} + +mz_bool mz_zip_writer_add_mem(mz_zip_archive *pZip, const char *pArchive_name, const void *pBuf, size_t buf_size, mz_uint level_and_flags) +{ + return mz_zip_writer_add_mem_ex(pZip, pArchive_name, pBuf, buf_size, NULL, 0, level_and_flags, 0, 0); +} + +typedef struct +{ + mz_zip_archive *m_pZip; + mz_uint64 m_cur_archive_file_ofs; + mz_uint64 m_comp_size; +} mz_zip_writer_add_state; + +static mz_bool mz_zip_writer_add_put_buf_callback(const void* pBuf, int len, void *pUser) +{ + mz_zip_writer_add_state *pState = (mz_zip_writer_add_state *)pUser; + if ((int)pState->m_pZip->m_pWrite(pState->m_pZip->m_pIO_opaque, pState->m_cur_archive_file_ofs, pBuf, len) != len) + return MZ_FALSE; + pState->m_cur_archive_file_ofs += len; + pState->m_comp_size += len; + return MZ_TRUE; +} + +static mz_bool mz_zip_writer_create_local_dir_header(mz_zip_archive *pZip, mz_uint8 *pDst, mz_uint16 filename_size, mz_uint16 extra_size, mz_uint64 uncomp_size, mz_uint64 comp_size, mz_uint32 uncomp_crc32, mz_uint16 method, mz_uint16 bit_flags, mz_uint16 dos_time, mz_uint16 dos_date) +{ + (void)pZip; + memset(pDst, 0, MZ_ZIP_LOCAL_DIR_HEADER_SIZE); + MZ_WRITE_LE32(pDst + MZ_ZIP_LDH_SIG_OFS, MZ_ZIP_LOCAL_DIR_HEADER_SIG); + MZ_WRITE_LE16(pDst + MZ_ZIP_LDH_VERSION_NEEDED_OFS, method ? 20 : 0); + MZ_WRITE_LE16(pDst + MZ_ZIP_LDH_BIT_FLAG_OFS, bit_flags); + MZ_WRITE_LE16(pDst + MZ_ZIP_LDH_METHOD_OFS, method); + MZ_WRITE_LE16(pDst + MZ_ZIP_LDH_FILE_TIME_OFS, dos_time); + MZ_WRITE_LE16(pDst + MZ_ZIP_LDH_FILE_DATE_OFS, dos_date); + MZ_WRITE_LE32(pDst + MZ_ZIP_LDH_CRC32_OFS, uncomp_crc32); + MZ_WRITE_LE32(pDst + MZ_ZIP_LDH_COMPRESSED_SIZE_OFS, comp_size); + MZ_WRITE_LE32(pDst + MZ_ZIP_LDH_DECOMPRESSED_SIZE_OFS, uncomp_size); + MZ_WRITE_LE16(pDst + MZ_ZIP_LDH_FILENAME_LEN_OFS, filename_size); + MZ_WRITE_LE16(pDst + MZ_ZIP_LDH_EXTRA_LEN_OFS, extra_size); + return MZ_TRUE; +} + +static mz_bool mz_zip_writer_create_central_dir_header(mz_zip_archive *pZip, mz_uint8 *pDst, mz_uint16 filename_size, mz_uint16 extra_size, mz_uint16 comment_size, mz_uint64 uncomp_size, mz_uint64 comp_size, mz_uint32 uncomp_crc32, mz_uint16 method, mz_uint16 bit_flags, mz_uint16 dos_time, mz_uint16 dos_date, mz_uint64 local_header_ofs, mz_uint32 ext_attributes) +{ + (void)pZip; + memset(pDst, 0, MZ_ZIP_CENTRAL_DIR_HEADER_SIZE); + MZ_WRITE_LE32(pDst + MZ_ZIP_CDH_SIG_OFS, MZ_ZIP_CENTRAL_DIR_HEADER_SIG); + MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_VERSION_NEEDED_OFS, method ? 20 : 0); + MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_BIT_FLAG_OFS, bit_flags); + MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_METHOD_OFS, method); + MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_FILE_TIME_OFS, dos_time); + MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_FILE_DATE_OFS, dos_date); + MZ_WRITE_LE32(pDst + MZ_ZIP_CDH_CRC32_OFS, uncomp_crc32); + MZ_WRITE_LE32(pDst + MZ_ZIP_CDH_COMPRESSED_SIZE_OFS, comp_size); + MZ_WRITE_LE32(pDst + MZ_ZIP_CDH_DECOMPRESSED_SIZE_OFS, uncomp_size); + MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_FILENAME_LEN_OFS, filename_size); + MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_EXTRA_LEN_OFS, extra_size); + MZ_WRITE_LE16(pDst + MZ_ZIP_CDH_COMMENT_LEN_OFS, comment_size); + MZ_WRITE_LE32(pDst + MZ_ZIP_CDH_EXTERNAL_ATTR_OFS, ext_attributes); + MZ_WRITE_LE32(pDst + MZ_ZIP_CDH_LOCAL_HEADER_OFS, local_header_ofs); + return MZ_TRUE; +} + +static mz_bool mz_zip_writer_add_to_central_dir(mz_zip_archive *pZip, const char *pFilename, mz_uint16 filename_size, const void *pExtra, mz_uint16 extra_size, const void *pComment, mz_uint16 comment_size, mz_uint64 uncomp_size, mz_uint64 comp_size, mz_uint32 uncomp_crc32, mz_uint16 method, mz_uint16 bit_flags, mz_uint16 dos_time, mz_uint16 dos_date, mz_uint64 local_header_ofs, mz_uint32 ext_attributes) +{ + mz_zip_internal_state *pState = pZip->m_pState; + mz_uint32 central_dir_ofs = (mz_uint32)pState->m_central_dir.m_size; + size_t orig_central_dir_size = pState->m_central_dir.m_size; + mz_uint8 central_dir_header[MZ_ZIP_CENTRAL_DIR_HEADER_SIZE]; + + // No zip64 support yet + if ((local_header_ofs > 0xFFFFFFFF) || (((mz_uint64)pState->m_central_dir.m_size + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + filename_size + extra_size + comment_size) > 0xFFFFFFFF)) + return MZ_FALSE; + + if (!mz_zip_writer_create_central_dir_header(pZip, central_dir_header, filename_size, extra_size, comment_size, uncomp_size, comp_size, uncomp_crc32, method, bit_flags, dos_time, dos_date, local_header_ofs, ext_attributes)) + return MZ_FALSE; + + if ((!mz_zip_array_push_back(pZip, &pState->m_central_dir, central_dir_header, MZ_ZIP_CENTRAL_DIR_HEADER_SIZE)) || + (!mz_zip_array_push_back(pZip, &pState->m_central_dir, pFilename, filename_size)) || + (!mz_zip_array_push_back(pZip, &pState->m_central_dir, pExtra, extra_size)) || + (!mz_zip_array_push_back(pZip, &pState->m_central_dir, pComment, comment_size)) || + (!mz_zip_array_push_back(pZip, &pState->m_central_dir_offsets, ¢ral_dir_ofs, 1))) + { + // Try to push the central directory array back into its original state. + mz_zip_array_resize(pZip, &pState->m_central_dir, orig_central_dir_size, MZ_FALSE); + return MZ_FALSE; + } + + return MZ_TRUE; +} + +static mz_bool mz_zip_writer_validate_archive_name(const char *pArchive_name) +{ + // Basic ZIP archive filename validity checks: Valid filenames cannot start with a forward slash, cannot contain a drive letter, and cannot use DOS-style backward slashes. + if (*pArchive_name == '/') + return MZ_FALSE; + while (*pArchive_name) + { + if ((*pArchive_name == '\\') || (*pArchive_name == ':')) + return MZ_FALSE; + pArchive_name++; + } + return MZ_TRUE; +} + +static mz_uint mz_zip_writer_compute_padding_needed_for_file_alignment(mz_zip_archive *pZip) +{ + mz_uint32 n; + if (!pZip->m_file_offset_alignment) + return 0; + n = (mz_uint32)(pZip->m_archive_size & (pZip->m_file_offset_alignment - 1)); + return (pZip->m_file_offset_alignment - n) & (pZip->m_file_offset_alignment - 1); +} + +static mz_bool mz_zip_writer_write_zeros(mz_zip_archive *pZip, mz_uint64 cur_file_ofs, mz_uint32 n) +{ + char buf[4096]; + memset(buf, 0, MZ_MIN(sizeof(buf), n)); + while (n) + { + mz_uint32 s = MZ_MIN(sizeof(buf), n); + if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_file_ofs, buf, s) != s) + return MZ_FALSE; + cur_file_ofs += s; n -= s; + } + return MZ_TRUE; +} + +mz_bool mz_zip_writer_add_mem_ex(mz_zip_archive *pZip, const char *pArchive_name, const void *pBuf, size_t buf_size, const void *pComment, mz_uint16 comment_size, mz_uint level_and_flags, mz_uint64 uncomp_size, mz_uint32 uncomp_crc32) +{ + mz_uint16 method = 0, dos_time = 0, dos_date = 0; + mz_uint level, ext_attributes = 0, num_alignment_padding_bytes; + mz_uint64 local_dir_header_ofs = pZip->m_archive_size, cur_archive_file_ofs = pZip->m_archive_size, comp_size = 0; + size_t archive_name_size; + mz_uint8 local_dir_header[MZ_ZIP_LOCAL_DIR_HEADER_SIZE]; + tdefl_compressor *pComp = NULL; + mz_bool store_data_uncompressed; + mz_zip_internal_state *pState; + + if ((int)level_and_flags < 0) + level_and_flags = MZ_DEFAULT_LEVEL; + level = level_and_flags & 0xF; + store_data_uncompressed = ((!level) || (level_and_flags & MZ_ZIP_FLAG_COMPRESSED_DATA)); + + if ((!pZip) || (!pZip->m_pState) || (pZip->m_zip_mode != MZ_ZIP_MODE_WRITING) || ((buf_size) && (!pBuf)) || (!pArchive_name) || ((comment_size) && (!pComment)) || (pZip->m_total_files == 0xFFFF) || (level > MZ_UBER_COMPRESSION)) + return MZ_FALSE; + + pState = pZip->m_pState; + + if ((!(level_and_flags & MZ_ZIP_FLAG_COMPRESSED_DATA)) && (uncomp_size)) + return MZ_FALSE; + // No zip64 support yet + if ((buf_size > 0xFFFFFFFF) || (uncomp_size > 0xFFFFFFFF)) + return MZ_FALSE; + if (!mz_zip_writer_validate_archive_name(pArchive_name)) + return MZ_FALSE; + +#ifndef MINIZ_NO_TIME + { + time_t cur_time; time(&cur_time); + mz_zip_time_to_dos_time(cur_time, &dos_time, &dos_date); + } +#endif // #ifndef MINIZ_NO_TIME + + archive_name_size = strlen(pArchive_name); + if (archive_name_size > 0xFFFF) + return MZ_FALSE; + + num_alignment_padding_bytes = mz_zip_writer_compute_padding_needed_for_file_alignment(pZip); + + // no zip64 support yet + if ((pZip->m_total_files == 0xFFFF) || ((pZip->m_archive_size + num_alignment_padding_bytes + MZ_ZIP_LOCAL_DIR_HEADER_SIZE + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + comment_size + archive_name_size) > 0xFFFFFFFF)) + return MZ_FALSE; + + if ((archive_name_size) && (pArchive_name[archive_name_size - 1] == '/')) + { + // Set DOS Subdirectory attribute bit. + ext_attributes |= 0x10; + // Subdirectories cannot contain data. + if ((buf_size) || (uncomp_size)) + return MZ_FALSE; + } + + // Try to do any allocations before writing to the archive, so if an allocation fails the file remains unmodified. (A good idea if we're doing an in-place modification.) + if ((!mz_zip_array_ensure_room(pZip, &pState->m_central_dir, MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + archive_name_size + comment_size)) || (!mz_zip_array_ensure_room(pZip, &pState->m_central_dir_offsets, 1))) + return MZ_FALSE; + + if ((!store_data_uncompressed) && (buf_size)) + { + if (NULL == (pComp = (tdefl_compressor *)pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, sizeof(tdefl_compressor)))) + return MZ_FALSE; + } + + if (!mz_zip_writer_write_zeros(pZip, cur_archive_file_ofs, num_alignment_padding_bytes + sizeof(local_dir_header))) + { + pZip->m_pFree(pZip->m_pAlloc_opaque, pComp); + return MZ_FALSE; + } + local_dir_header_ofs += num_alignment_padding_bytes; + if (pZip->m_file_offset_alignment) { MZ_ASSERT((local_dir_header_ofs & (pZip->m_file_offset_alignment - 1)) == 0); } + cur_archive_file_ofs += num_alignment_padding_bytes + sizeof(local_dir_header); + + MZ_CLEAR_OBJ(local_dir_header); + if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_archive_file_ofs, pArchive_name, archive_name_size) != archive_name_size) + { + pZip->m_pFree(pZip->m_pAlloc_opaque, pComp); + return MZ_FALSE; + } + cur_archive_file_ofs += archive_name_size; + + if (!(level_and_flags & MZ_ZIP_FLAG_COMPRESSED_DATA)) + { + uncomp_crc32 = (mz_uint32)mz_crc32(MZ_CRC32_INIT, (const mz_uint8*)pBuf, buf_size); + uncomp_size = buf_size; + if (uncomp_size <= 3) + { + level = 0; + store_data_uncompressed = MZ_TRUE; + } + } + + if (store_data_uncompressed) + { + if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_archive_file_ofs, pBuf, buf_size) != buf_size) + { + pZip->m_pFree(pZip->m_pAlloc_opaque, pComp); + return MZ_FALSE; + } + + cur_archive_file_ofs += buf_size; + comp_size = buf_size; + + if (level_and_flags & MZ_ZIP_FLAG_COMPRESSED_DATA) + method = MZ_DEFLATED; + } + else if (buf_size) + { + mz_zip_writer_add_state state; + + state.m_pZip = pZip; + state.m_cur_archive_file_ofs = cur_archive_file_ofs; + state.m_comp_size = 0; + + if ((tdefl_init(pComp, mz_zip_writer_add_put_buf_callback, &state, tdefl_create_comp_flags_from_zip_params(level, -15, MZ_DEFAULT_STRATEGY)) != TDEFL_STATUS_OKAY) || + (tdefl_compress_buffer(pComp, pBuf, buf_size, TDEFL_FINISH) != TDEFL_STATUS_DONE)) + { + pZip->m_pFree(pZip->m_pAlloc_opaque, pComp); + return MZ_FALSE; + } + + comp_size = state.m_comp_size; + cur_archive_file_ofs = state.m_cur_archive_file_ofs; + + method = MZ_DEFLATED; + } + + pZip->m_pFree(pZip->m_pAlloc_opaque, pComp); + pComp = NULL; + + // no zip64 support yet + if ((comp_size > 0xFFFFFFFF) || (cur_archive_file_ofs > 0xFFFFFFFF)) + return MZ_FALSE; + + if (!mz_zip_writer_create_local_dir_header(pZip, local_dir_header, (mz_uint16)archive_name_size, 0, uncomp_size, comp_size, uncomp_crc32, method, 0, dos_time, dos_date)) + return MZ_FALSE; + + if (pZip->m_pWrite(pZip->m_pIO_opaque, local_dir_header_ofs, local_dir_header, sizeof(local_dir_header)) != sizeof(local_dir_header)) + return MZ_FALSE; + + if (!mz_zip_writer_add_to_central_dir(pZip, pArchive_name, (mz_uint16)archive_name_size, NULL, 0, pComment, comment_size, uncomp_size, comp_size, uncomp_crc32, method, 0, dos_time, dos_date, local_dir_header_ofs, ext_attributes)) + return MZ_FALSE; + + pZip->m_total_files++; + pZip->m_archive_size = cur_archive_file_ofs; + + return MZ_TRUE; +} + +#ifndef MINIZ_NO_STDIO +mz_bool mz_zip_writer_add_file(mz_zip_archive *pZip, const char *pArchive_name, const char *pSrc_filename, const void *pComment, mz_uint16 comment_size, mz_uint level_and_flags) +{ + mz_uint uncomp_crc32 = MZ_CRC32_INIT, level, num_alignment_padding_bytes; + mz_uint16 method = 0, dos_time = 0, dos_date = 0, ext_attributes = 0; + mz_uint64 local_dir_header_ofs = pZip->m_archive_size, cur_archive_file_ofs = pZip->m_archive_size, uncomp_size = 0, comp_size = 0; + size_t archive_name_size; + mz_uint8 local_dir_header[MZ_ZIP_LOCAL_DIR_HEADER_SIZE]; + MZ_FILE *pSrc_file = NULL; + + if ((int)level_and_flags < 0) + level_and_flags = MZ_DEFAULT_LEVEL; + level = level_and_flags & 0xF; + + if ((!pZip) || (!pZip->m_pState) || (pZip->m_zip_mode != MZ_ZIP_MODE_WRITING) || (!pArchive_name) || ((comment_size) && (!pComment)) || (level > MZ_UBER_COMPRESSION)) + return MZ_FALSE; + if (level_and_flags & MZ_ZIP_FLAG_COMPRESSED_DATA) + return MZ_FALSE; + if (!mz_zip_writer_validate_archive_name(pArchive_name)) + return MZ_FALSE; + + archive_name_size = strlen(pArchive_name); + if (archive_name_size > 0xFFFF) + return MZ_FALSE; + + num_alignment_padding_bytes = mz_zip_writer_compute_padding_needed_for_file_alignment(pZip); + + // no zip64 support yet + if ((pZip->m_total_files == 0xFFFF) || ((pZip->m_archive_size + num_alignment_padding_bytes + MZ_ZIP_LOCAL_DIR_HEADER_SIZE + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE + comment_size + archive_name_size) > 0xFFFFFFFF)) + return MZ_FALSE; + + if (!mz_zip_get_file_modified_time(pSrc_filename, &dos_time, &dos_date)) + return MZ_FALSE; + + pSrc_file = MZ_FOPEN(pSrc_filename, "rb"); + if (!pSrc_file) + return MZ_FALSE; + MZ_FSEEK64(pSrc_file, 0, SEEK_END); + uncomp_size = MZ_FTELL64(pSrc_file); + MZ_FSEEK64(pSrc_file, 0, SEEK_SET); + + if (uncomp_size > 0xFFFFFFFF) + { + // No zip64 support yet + MZ_FCLOSE(pSrc_file); + return MZ_FALSE; + } + if (uncomp_size <= 3) + level = 0; + + if (!mz_zip_writer_write_zeros(pZip, cur_archive_file_ofs, num_alignment_padding_bytes + sizeof(local_dir_header))) + return MZ_FALSE; + local_dir_header_ofs += num_alignment_padding_bytes; + if (pZip->m_file_offset_alignment) { MZ_ASSERT((local_dir_header_ofs & (pZip->m_file_offset_alignment - 1)) == 0); } + cur_archive_file_ofs += num_alignment_padding_bytes + sizeof(local_dir_header); + + MZ_CLEAR_OBJ(local_dir_header); + if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_archive_file_ofs, pArchive_name, archive_name_size) != archive_name_size) + { + MZ_FCLOSE(pSrc_file); + return MZ_FALSE; + } + cur_archive_file_ofs += archive_name_size; + + if (uncomp_size) + { + mz_uint64 uncomp_remaining = uncomp_size; + void *pRead_buf = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, MZ_ZIP_MAX_IO_BUF_SIZE); + if (!pRead_buf) + { + MZ_FCLOSE(pSrc_file); + return MZ_FALSE; + } + + if (!level) + { + while (uncomp_remaining) + { + mz_uint n = (mz_uint)MZ_MIN(MZ_ZIP_MAX_IO_BUF_SIZE, uncomp_remaining); + if ((MZ_FREAD(pRead_buf, 1, n, pSrc_file) != n) || (pZip->m_pWrite(pZip->m_pIO_opaque, cur_archive_file_ofs, pRead_buf, n) != n)) + { + pZip->m_pFree(pZip->m_pAlloc_opaque, pRead_buf); + MZ_FCLOSE(pSrc_file); + return MZ_FALSE; + } + uncomp_crc32 = (mz_uint32)mz_crc32(uncomp_crc32, (const mz_uint8 *)pRead_buf, n); + uncomp_remaining -= n; + cur_archive_file_ofs += n; + } + comp_size = uncomp_size; + } + else + { + mz_bool result = MZ_FALSE; + mz_zip_writer_add_state state; + tdefl_compressor *pComp = (tdefl_compressor *)pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, sizeof(tdefl_compressor)); + if (!pComp) + { + pZip->m_pFree(pZip->m_pAlloc_opaque, pRead_buf); + MZ_FCLOSE(pSrc_file); + return MZ_FALSE; + } + + state.m_pZip = pZip; + state.m_cur_archive_file_ofs = cur_archive_file_ofs; + state.m_comp_size = 0; + + if (tdefl_init(pComp, mz_zip_writer_add_put_buf_callback, &state, tdefl_create_comp_flags_from_zip_params(level, -15, MZ_DEFAULT_STRATEGY)) != TDEFL_STATUS_OKAY) + { + pZip->m_pFree(pZip->m_pAlloc_opaque, pComp); + pZip->m_pFree(pZip->m_pAlloc_opaque, pRead_buf); + MZ_FCLOSE(pSrc_file); + return MZ_FALSE; + } + + for ( ; ; ) + { + size_t in_buf_size = (mz_uint32)MZ_MIN(uncomp_remaining, MZ_ZIP_MAX_IO_BUF_SIZE); + tdefl_status status; + + if (MZ_FREAD(pRead_buf, 1, in_buf_size, pSrc_file) != in_buf_size) + break; + + uncomp_crc32 = (mz_uint32)mz_crc32(uncomp_crc32, (const mz_uint8 *)pRead_buf, in_buf_size); + uncomp_remaining -= in_buf_size; + + status = tdefl_compress_buffer(pComp, pRead_buf, in_buf_size, uncomp_remaining ? TDEFL_NO_FLUSH : TDEFL_FINISH); + if (status == TDEFL_STATUS_DONE) + { + result = MZ_TRUE; + break; + } + else if (status != TDEFL_STATUS_OKAY) + break; + } + + pZip->m_pFree(pZip->m_pAlloc_opaque, pComp); + + if (!result) + { + pZip->m_pFree(pZip->m_pAlloc_opaque, pRead_buf); + MZ_FCLOSE(pSrc_file); + return MZ_FALSE; + } + + comp_size = state.m_comp_size; + cur_archive_file_ofs = state.m_cur_archive_file_ofs; + + method = MZ_DEFLATED; + } + + pZip->m_pFree(pZip->m_pAlloc_opaque, pRead_buf); + } + + MZ_FCLOSE(pSrc_file); pSrc_file = NULL; + + // no zip64 support yet + if ((comp_size > 0xFFFFFFFF) || (cur_archive_file_ofs > 0xFFFFFFFF)) + return MZ_FALSE; + + if (!mz_zip_writer_create_local_dir_header(pZip, local_dir_header, (mz_uint16)archive_name_size, 0, uncomp_size, comp_size, uncomp_crc32, method, 0, dos_time, dos_date)) + return MZ_FALSE; + + if (pZip->m_pWrite(pZip->m_pIO_opaque, local_dir_header_ofs, local_dir_header, sizeof(local_dir_header)) != sizeof(local_dir_header)) + return MZ_FALSE; + + if (!mz_zip_writer_add_to_central_dir(pZip, pArchive_name, (mz_uint16)archive_name_size, NULL, 0, pComment, comment_size, uncomp_size, comp_size, uncomp_crc32, method, 0, dos_time, dos_date, local_dir_header_ofs, ext_attributes)) + return MZ_FALSE; + + pZip->m_total_files++; + pZip->m_archive_size = cur_archive_file_ofs; + + return MZ_TRUE; +} +#endif // #ifndef MINIZ_NO_STDIO + +mz_bool mz_zip_writer_add_from_zip_reader(mz_zip_archive *pZip, mz_zip_archive *pSource_zip, mz_uint file_index) +{ + mz_uint n, bit_flags, num_alignment_padding_bytes; + mz_uint64 comp_bytes_remaining, local_dir_header_ofs; + mz_uint64 cur_src_file_ofs, cur_dst_file_ofs; + mz_uint32 local_header_u32[(MZ_ZIP_LOCAL_DIR_HEADER_SIZE + sizeof(mz_uint32) - 1) / sizeof(mz_uint32)]; mz_uint8 *pLocal_header = (mz_uint8 *)local_header_u32; + mz_uint8 central_header[MZ_ZIP_CENTRAL_DIR_HEADER_SIZE]; + size_t orig_central_dir_size; + mz_zip_internal_state *pState; + void *pBuf; const mz_uint8 *pSrc_central_header; + + if ((!pZip) || (!pZip->m_pState) || (pZip->m_zip_mode != MZ_ZIP_MODE_WRITING)) + return MZ_FALSE; + if (NULL == (pSrc_central_header = mz_zip_reader_get_cdh(pSource_zip, file_index))) + return MZ_FALSE; + pState = pZip->m_pState; + + num_alignment_padding_bytes = mz_zip_writer_compute_padding_needed_for_file_alignment(pZip); + + // no zip64 support yet + if ((pZip->m_total_files == 0xFFFF) || ((pZip->m_archive_size + num_alignment_padding_bytes + MZ_ZIP_LOCAL_DIR_HEADER_SIZE + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE) > 0xFFFFFFFF)) + return MZ_FALSE; + + cur_src_file_ofs = MZ_READ_LE32(pSrc_central_header + MZ_ZIP_CDH_LOCAL_HEADER_OFS); + cur_dst_file_ofs = pZip->m_archive_size; + + if (pSource_zip->m_pRead(pSource_zip->m_pIO_opaque, cur_src_file_ofs, pLocal_header, MZ_ZIP_LOCAL_DIR_HEADER_SIZE) != MZ_ZIP_LOCAL_DIR_HEADER_SIZE) + return MZ_FALSE; + if (MZ_READ_LE32(pLocal_header) != MZ_ZIP_LOCAL_DIR_HEADER_SIG) + return MZ_FALSE; + cur_src_file_ofs += MZ_ZIP_LOCAL_DIR_HEADER_SIZE; + + if (!mz_zip_writer_write_zeros(pZip, cur_dst_file_ofs, num_alignment_padding_bytes)) + return MZ_FALSE; + cur_dst_file_ofs += num_alignment_padding_bytes; + local_dir_header_ofs = cur_dst_file_ofs; + if (pZip->m_file_offset_alignment) { MZ_ASSERT((local_dir_header_ofs & (pZip->m_file_offset_alignment - 1)) == 0); } + + if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_dst_file_ofs, pLocal_header, MZ_ZIP_LOCAL_DIR_HEADER_SIZE) != MZ_ZIP_LOCAL_DIR_HEADER_SIZE) + return MZ_FALSE; + cur_dst_file_ofs += MZ_ZIP_LOCAL_DIR_HEADER_SIZE; + + n = MZ_READ_LE16(pLocal_header + MZ_ZIP_LDH_FILENAME_LEN_OFS) + MZ_READ_LE16(pLocal_header + MZ_ZIP_LDH_EXTRA_LEN_OFS); + comp_bytes_remaining = n + MZ_READ_LE32(pSrc_central_header + MZ_ZIP_CDH_COMPRESSED_SIZE_OFS); + + if (NULL == (pBuf = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, (size_t)MZ_MAX(sizeof(mz_uint32) * 4, MZ_MIN(MZ_ZIP_MAX_IO_BUF_SIZE, comp_bytes_remaining))))) + return MZ_FALSE; + + while (comp_bytes_remaining) + { + n = (mz_uint)MZ_MIN(MZ_ZIP_MAX_IO_BUF_SIZE, comp_bytes_remaining); + if (pSource_zip->m_pRead(pSource_zip->m_pIO_opaque, cur_src_file_ofs, pBuf, n) != n) + { + pZip->m_pFree(pZip->m_pAlloc_opaque, pBuf); + return MZ_FALSE; + } + cur_src_file_ofs += n; + + if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_dst_file_ofs, pBuf, n) != n) + { + pZip->m_pFree(pZip->m_pAlloc_opaque, pBuf); + return MZ_FALSE; + } + cur_dst_file_ofs += n; + + comp_bytes_remaining -= n; + } + + bit_flags = MZ_READ_LE16(pLocal_header + MZ_ZIP_LDH_BIT_FLAG_OFS); + if (bit_flags & 8) + { + // Copy data descriptor + if (pSource_zip->m_pRead(pSource_zip->m_pIO_opaque, cur_src_file_ofs, pBuf, sizeof(mz_uint32) * 4) != sizeof(mz_uint32) * 4) + { + pZip->m_pFree(pZip->m_pAlloc_opaque, pBuf); + return MZ_FALSE; + } + + n = sizeof(mz_uint32) * ((MZ_READ_LE32(pBuf) == 0x08074b50) ? 4 : 3); + if (pZip->m_pWrite(pZip->m_pIO_opaque, cur_dst_file_ofs, pBuf, n) != n) + { + pZip->m_pFree(pZip->m_pAlloc_opaque, pBuf); + return MZ_FALSE; + } + + cur_src_file_ofs += n; + cur_dst_file_ofs += n; + } + pZip->m_pFree(pZip->m_pAlloc_opaque, pBuf); + + // no zip64 support yet + if (cur_dst_file_ofs > 0xFFFFFFFF) + return MZ_FALSE; + + orig_central_dir_size = pState->m_central_dir.m_size; + + memcpy(central_header, pSrc_central_header, MZ_ZIP_CENTRAL_DIR_HEADER_SIZE); + MZ_WRITE_LE32(central_header + MZ_ZIP_CDH_LOCAL_HEADER_OFS, local_dir_header_ofs); + if (!mz_zip_array_push_back(pZip, &pState->m_central_dir, central_header, MZ_ZIP_CENTRAL_DIR_HEADER_SIZE)) + return MZ_FALSE; + + n = MZ_READ_LE16(pSrc_central_header + MZ_ZIP_CDH_FILENAME_LEN_OFS) + MZ_READ_LE16(pSrc_central_header + MZ_ZIP_CDH_EXTRA_LEN_OFS) + MZ_READ_LE16(pSrc_central_header + MZ_ZIP_CDH_COMMENT_LEN_OFS); + if (!mz_zip_array_push_back(pZip, &pState->m_central_dir, pSrc_central_header + MZ_ZIP_CENTRAL_DIR_HEADER_SIZE, n)) + { + mz_zip_array_resize(pZip, &pState->m_central_dir, orig_central_dir_size, MZ_FALSE); + return MZ_FALSE; + } + + if (pState->m_central_dir.m_size > 0xFFFFFFFF) + return MZ_FALSE; + n = (mz_uint32)pState->m_central_dir.m_size; + if (!mz_zip_array_push_back(pZip, &pState->m_central_dir_offsets, &n, 1)) + { + mz_zip_array_resize(pZip, &pState->m_central_dir, orig_central_dir_size, MZ_FALSE); + return MZ_FALSE; + } + + pZip->m_total_files++; + pZip->m_archive_size = cur_dst_file_ofs; + + return MZ_TRUE; +} + +mz_bool mz_zip_writer_finalize_archive(mz_zip_archive *pZip) +{ + mz_zip_internal_state *pState; + mz_uint64 central_dir_ofs, central_dir_size; + mz_uint8 hdr[MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIZE]; + + if ((!pZip) || (!pZip->m_pState) || (pZip->m_zip_mode != MZ_ZIP_MODE_WRITING)) + return MZ_FALSE; + + pState = pZip->m_pState; + + // no zip64 support yet + if ((pZip->m_total_files > 0xFFFF) || ((pZip->m_archive_size + pState->m_central_dir.m_size + MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIZE) > 0xFFFFFFFF)) + return MZ_FALSE; + + central_dir_ofs = 0; + central_dir_size = 0; + if (pZip->m_total_files) + { + // Write central directory + central_dir_ofs = pZip->m_archive_size; + central_dir_size = pState->m_central_dir.m_size; + pZip->m_central_directory_file_ofs = central_dir_ofs; + if (pZip->m_pWrite(pZip->m_pIO_opaque, central_dir_ofs, pState->m_central_dir.m_p, (size_t)central_dir_size) != central_dir_size) + return MZ_FALSE; + pZip->m_archive_size += central_dir_size; + } + + // Write end of central directory record + MZ_CLEAR_OBJ(hdr); + MZ_WRITE_LE32(hdr + MZ_ZIP_ECDH_SIG_OFS, MZ_ZIP_END_OF_CENTRAL_DIR_HEADER_SIG); + MZ_WRITE_LE16(hdr + MZ_ZIP_ECDH_CDIR_NUM_ENTRIES_ON_DISK_OFS, pZip->m_total_files); + MZ_WRITE_LE16(hdr + MZ_ZIP_ECDH_CDIR_TOTAL_ENTRIES_OFS, pZip->m_total_files); + MZ_WRITE_LE32(hdr + MZ_ZIP_ECDH_CDIR_SIZE_OFS, central_dir_size); + MZ_WRITE_LE32(hdr + MZ_ZIP_ECDH_CDIR_OFS_OFS, central_dir_ofs); + + if (pZip->m_pWrite(pZip->m_pIO_opaque, pZip->m_archive_size, hdr, sizeof(hdr)) != sizeof(hdr)) + return MZ_FALSE; +#ifndef MINIZ_NO_STDIO + if ((pState->m_pFile) && (MZ_FFLUSH(pState->m_pFile) == EOF)) + return MZ_FALSE; +#endif // #ifndef MINIZ_NO_STDIO + + pZip->m_archive_size += sizeof(hdr); + + pZip->m_zip_mode = MZ_ZIP_MODE_WRITING_HAS_BEEN_FINALIZED; + return MZ_TRUE; +} + +mz_bool mz_zip_writer_finalize_heap_archive(mz_zip_archive *pZip, void **pBuf, size_t *pSize) +{ + if ((!pZip) || (!pZip->m_pState) || (!pBuf) || (!pSize)) + return MZ_FALSE; + if (pZip->m_pWrite != mz_zip_heap_write_func) + return MZ_FALSE; + if (!mz_zip_writer_finalize_archive(pZip)) + return MZ_FALSE; + + *pBuf = pZip->m_pState->m_pMem; + *pSize = pZip->m_pState->m_mem_size; + pZip->m_pState->m_pMem = NULL; + pZip->m_pState->m_mem_size = pZip->m_pState->m_mem_capacity = 0; + return MZ_TRUE; +} + +mz_bool mz_zip_writer_end(mz_zip_archive *pZip) +{ + mz_zip_internal_state *pState; + mz_bool status = MZ_TRUE; + if ((!pZip) || (!pZip->m_pState) || (!pZip->m_pAlloc) || (!pZip->m_pFree) || ((pZip->m_zip_mode != MZ_ZIP_MODE_WRITING) && (pZip->m_zip_mode != MZ_ZIP_MODE_WRITING_HAS_BEEN_FINALIZED))) + return MZ_FALSE; + + pState = pZip->m_pState; + pZip->m_pState = NULL; + mz_zip_array_clear(pZip, &pState->m_central_dir); + mz_zip_array_clear(pZip, &pState->m_central_dir_offsets); + mz_zip_array_clear(pZip, &pState->m_sorted_central_dir_offsets); + +#ifndef MINIZ_NO_STDIO + if (pState->m_pFile) + { + MZ_FCLOSE(pState->m_pFile); + pState->m_pFile = NULL; + } +#endif // #ifndef MINIZ_NO_STDIO + + if ((pZip->m_pWrite == mz_zip_heap_write_func) && (pState->m_pMem)) + { + pZip->m_pFree(pZip->m_pAlloc_opaque, pState->m_pMem); + pState->m_pMem = NULL; + } + + pZip->m_pFree(pZip->m_pAlloc_opaque, pState); + pZip->m_zip_mode = MZ_ZIP_MODE_INVALID; + return status; +} + +#ifndef MINIZ_NO_STDIO +mz_bool mz_zip_add_mem_to_archive_file_in_place(const char *pZip_filename, const char *pArchive_name, const void *pBuf, size_t buf_size, const void *pComment, mz_uint16 comment_size, mz_uint level_and_flags) +{ + mz_bool status, created_new_archive = MZ_FALSE; + mz_zip_archive zip_archive; + struct MZ_FILE_STAT_STRUCT file_stat; + MZ_CLEAR_OBJ(zip_archive); + if ((int)level_and_flags < 0) + level_and_flags = MZ_DEFAULT_LEVEL; + if ((!pZip_filename) || (!pArchive_name) || ((buf_size) && (!pBuf)) || ((comment_size) && (!pComment)) || ((level_and_flags & 0xF) > MZ_UBER_COMPRESSION)) + return MZ_FALSE; + if (!mz_zip_writer_validate_archive_name(pArchive_name)) + return MZ_FALSE; + if (MZ_FILE_STAT(pZip_filename, &file_stat) != 0) + { + // Create a new archive. + if (!mz_zip_writer_init_file(&zip_archive, pZip_filename, 0)) + return MZ_FALSE; + created_new_archive = MZ_TRUE; + } + else + { + // Append to an existing archive. + if (!mz_zip_reader_init_file(&zip_archive, pZip_filename, level_and_flags | MZ_ZIP_FLAG_DO_NOT_SORT_CENTRAL_DIRECTORY)) + return MZ_FALSE; + if (!mz_zip_writer_init_from_reader(&zip_archive, pZip_filename)) + { + mz_zip_reader_end(&zip_archive); + return MZ_FALSE; + } + } + status = mz_zip_writer_add_mem_ex(&zip_archive, pArchive_name, pBuf, buf_size, pComment, comment_size, level_and_flags, 0, 0); + // Always finalize, even if adding failed for some reason, so we have a valid central directory. (This may not always succeed, but we can try.) + if (!mz_zip_writer_finalize_archive(&zip_archive)) + status = MZ_FALSE; + if (!mz_zip_writer_end(&zip_archive)) + status = MZ_FALSE; + if ((!status) && (created_new_archive)) + { + // It's a new archive and something went wrong, so just delete it. + int ignoredStatus = MZ_DELETE_FILE(pZip_filename); + (void)ignoredStatus; + } + return status; +} + +void *mz_zip_extract_archive_file_to_heap(const char *pZip_filename, const char *pArchive_name, size_t *pSize, mz_uint flags) +{ + int file_index; + mz_zip_archive zip_archive; + void *p = NULL; + + if (pSize) + *pSize = 0; + + if ((!pZip_filename) || (!pArchive_name)) + return NULL; + + MZ_CLEAR_OBJ(zip_archive); + if (!mz_zip_reader_init_file(&zip_archive, pZip_filename, flags | MZ_ZIP_FLAG_DO_NOT_SORT_CENTRAL_DIRECTORY)) + return NULL; + + if ((file_index = mz_zip_reader_locate_file(&zip_archive, pArchive_name, NULL, flags)) >= 0) + p = mz_zip_reader_extract_to_heap(&zip_archive, file_index, pSize, flags); + + mz_zip_reader_end(&zip_archive); + return p; +} + +#endif // #ifndef MINIZ_NO_STDIO + +#endif // #ifndef MINIZ_NO_ARCHIVE_WRITING_APIS + +#endif // #ifndef MINIZ_NO_ARCHIVE_APIS + +#ifdef __cplusplus +} +#endif + +#endif // MINIZ_HEADER_FILE_ONLY + +/* + This is free and unencumbered software released into the public domain. + + Anyone is free to copy, modify, publish, use, compile, sell, or + distribute this software, either in source code form or as a compiled + binary, for any purpose, commercial or non-commercial, and by any + means. + + In jurisdictions that recognize copyright laws, the author or authors + of this software dedicate any and all copyright interest in the + software to the public domain. We make this dedication for the benefit + of the public at large and to the detriment of our heirs and + successors. We intend this dedication to be an overt act of + relinquishment in perpetuity of all present and future rights to this + software under copyright law. + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR + OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + OTHER DEALINGS IN THE SOFTWARE. + + For more information, please refer to +*/ diff --git a/project/jni/sdl2_image/showimage.c b/project/jni/sdl2_image/showimage.c new file mode 100644 index 000000000..9d5e73cbf --- /dev/null +++ b/project/jni/sdl2_image/showimage.c @@ -0,0 +1,175 @@ +/* + showimage: A test application for the SDL image loading library. + Copyright (C) 1997-2013 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +#include +#include +#include + +#include "SDL.h" +#include "SDL_image.h" + + +/* Draw a Gimpish background pattern to show transparency in the image */ +static void draw_background(SDL_Renderer *renderer, int w, int h) +{ + SDL_Color col[2] = { + { 0x66, 0x66, 0x66, 0xff }, + { 0x99, 0x99, 0x99, 0xff }, + }; + int i, x, y; + SDL_Rect rect; + + rect.w = 8; + rect.h = 8; + for (y = 0; y < h; y += rect.h) { + for (x = 0; x < w; x += rect.w) { + /* use an 8x8 checkerboard pattern */ + i = (((x ^ y) >> 3) & 1); + SDL_SetRenderDrawColor(renderer, col[i].r, col[i].g, col[i].b, col[i].a); + + rect.x = x; + rect.y = y; + SDL_RenderFillRect(renderer, &rect); + } + } +} + +int main(int argc, char *argv[]) +{ + SDL_Window *window; + SDL_Renderer *renderer; + SDL_Texture *texture; + Uint32 flags; + int i, w, h, done; + SDL_Event event; + const char *saveFile = NULL; + + /* Check command line usage */ + if ( ! argv[1] ) { + fprintf(stderr, "Usage: %s [-fullscreen] [-save file.png] ...\n", argv[0]); + return(1); + } + + flags = SDL_WINDOW_HIDDEN; + for ( i=1; argv[i]; ++i ) { + if ( strcmp(argv[i], "-fullscreen") == 0 ) { + SDL_ShowCursor(0); + flags |= SDL_WINDOW_FULLSCREEN; + } + } + + if (SDL_CreateWindowAndRenderer(0, 0, flags, &window, &renderer) < 0) { + fprintf(stderr, "SDL_CreateWindowAndRenderer() failed: %s\n", SDL_GetError()); + return(2); + } + + for ( i=1; argv[i]; ++i ) { + if ( strcmp(argv[i], "-fullscreen") == 0 ) { + continue; + } + + if ( strcmp(argv[i], "-save") == 0 && argv[i+1] ) { + ++i; + saveFile = argv[i]; + continue; + } + + /* Open the image file */ + texture = IMG_LoadTexture(renderer, argv[i]); + if (!texture) { + fprintf(stderr, "Couldn't load %s: %s\n", argv[i], SDL_GetError()); + continue; + } + SDL_QueryTexture(texture, NULL, NULL, &w, &h); + + /* Save the image file, if desired */ + if ( saveFile ) { + SDL_Surface *surface = IMG_Load(argv[i]); + if (surface) { + if ( IMG_SavePNG(surface, saveFile) < 0 ) { + fprintf(stderr, "Couldn't save %s: %s\n", saveFile, SDL_GetError()); + } + } else { + fprintf(stderr, "Couldn't load %s: %s\n", argv[i], SDL_GetError()); + } + } + + /* Show the window */ + SDL_SetWindowTitle(window, argv[i]); + SDL_SetWindowSize(window, w, h); + SDL_ShowWindow(window); + + done = 0; + while ( ! done ) { + while ( SDL_PollEvent(&event) ) { + switch (event.type) { + case SDL_KEYUP: + switch (event.key.keysym.sym) { + case SDLK_LEFT: + if ( i > 1 ) { + i -= 2; + done = 1; + } + break; + case SDLK_RIGHT: + if ( argv[i+1] ) { + done = 1; + } + break; + case SDLK_ESCAPE: + case SDLK_q: + argv[i+1] = NULL; + /* Drop through to done */ + case SDLK_SPACE: + case SDLK_TAB: + done = 1; + break; + default: + break; + } + break; + case SDL_MOUSEBUTTONDOWN: + done = 1; + break; + case SDL_QUIT: + argv[i+1] = NULL; + done = 1; + break; + default: + break; + } + } + /* Draw a background pattern in case the image has transparency */ + draw_background(renderer, w, h); + + /* Display the image */ + SDL_RenderCopy(renderer, texture, NULL, NULL); + SDL_RenderPresent(renderer); + + SDL_Delay(100); + } + SDL_DestroyTexture(texture); + } + + /* We're done! */ + SDL_Quit(); + return(0); +}