pelya
235 lines
8.9 KiB
C
235 lines
8.9 KiB
C
/*
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* Author:
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* Guido Draheim <guidod@gmx.de>
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*
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* Copyright (c) 2000,2001,2002,2003 Guido Draheim
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* All rights reserved
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* use under the restrictions of the
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* Lesser GNU General Public License
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* or alternatively the restrictions
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* of the Mozilla Public License 1.1
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*
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* The information was taken from appnote-981119-iz.zip
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* at http://www.freesoftware.com/pub/infozip/doc/
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* which in turn is based on PKWARE's appnote.txt
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* (newer link: ftp://ftp.info-zip.org/pub/infozip/doc/)
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*/
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#ifndef _ZZIP_FORMAT_H /* zzipformat.h */
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#define _ZZIP_FORMAT_H
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#include <zzip/types.h>
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#include <zzip/__hints.h>
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/* we have ICO C 9X types defined */
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/*
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* Overall zipfile format
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* [local file header + file data stream + checksum descriptor] ...
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* ... [disk central directory] [disk trailer record]
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*/
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# ifdef _MSC_VER
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# pragma pack(push, 1)
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# endif
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struct zzip_version
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{
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zzip_byte_t version[1];
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zzip_byte_t ostype[1];
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} ZZIP_GNUC_PACKED;
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struct zzip_dostime
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{
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zzip_byte_t time[2];
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zzip_byte_t date[2];
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} ZZIP_GNUC_PACKED;
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#ifdef ZZIP_NEED_PACKED
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/* if your compiler does interesting things about struct packing... */
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typedef zzip_byte_t zzip_version_t[2];
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typedef zzip_byte_t zzip_dostime_t[4];
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#else
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typedef struct zzip_version zzip_version_t;
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typedef struct zzip_dostime zzip_dostime_t;
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#endif
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#define ZZIP_CHECKMAGIC(__p,__A,__B,__C,__D) \
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( (((zzip_byte_t*)(__p))[0]==(__A)) && \
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(((zzip_byte_t*)(__p))[1]==(__B)) && \
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(((zzip_byte_t*)(__p))[2]==(__C)) && \
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(((zzip_byte_t*)(__p))[3]==(__D)) )
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/* A. Local file header */
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struct zzip_file_header
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{
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# define ZZIP_FILE_HEADER_MAGIC 0x04034b50
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# define ZZIP_FILE_HEADER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\3','\4')
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zzip_byte_t z_magic[4]; /* local file header signature (0x04034b50) */
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zzip_version_t z_extract; /* version needed to extract */
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zzip_byte_t z_flags[2]; /* general purpose bit flag */
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zzip_byte_t z_compr[2]; /* compression method */
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zzip_dostime_t z_dostime; /* last mod file time (dos format) */
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zzip_byte_t z_crc32[4]; /* crc-32 */
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zzip_byte_t z_csize[4]; /* compressed size */
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zzip_byte_t z_usize[4]; /* uncompressed size */
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zzip_byte_t z_namlen[2]; /* filename length (null if stdin) */
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zzip_byte_t z_extras[2]; /* extra field length */
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/* followed by filename (of variable size) */
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/* followed by extra field (of variable size) */
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} ZZIP_GNUC_PACKED;
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#define zzip_file_header_headerlength (4+2+2+2+4+4+4+4+2+2)
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/* B. data descriptor
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* the data descriptor exists only if bit 3 of z_flags is set. It is byte aligned
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* and immediately follows the last byte of compressed data. It is only used if
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* the output media of the compressor was not seekable, eg. standard output.
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*/
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struct zzip_file_trailer
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{
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# define ZZIP_FILE_TRAILER_MAGIC 0x08074B50
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# define ZZIP_FILE_TRAILER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\7','\8')
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zzip_byte_t z_magic[4]; /* data descriptor signature (0x08074b50) */
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zzip_byte_t z_crc32[4]; /* crc-32 */
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zzip_byte_t z_csize[4]; /* compressed size */
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zzip_byte_t z_usize[4]; /* uncompressed size */
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} ZZIP_GNUC_PACKED;
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#define zzip_file_trailer_headerlength (4+4+4+4)
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/* C. central directory structure:
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[file header] . . . end of central dir record
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*/
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/* directory file header
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* - a single entry including filename, extras and comment may not exceed 64k.
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*/
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struct zzip_disk_entry
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{
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# define ZZIP_DISK_ENTRY_MAGIC 0x02014b50
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# define ZZIP_DISK_ENTRY_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\1','\2')
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zzip_byte_t z_magic[4]; /* central file header signature (0x02014b50) */
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zzip_version_t z_encoder; /* version made by */
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zzip_version_t z_extract; /* version need to extract */
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zzip_byte_t z_flags[2]; /* general purpose bit flag */
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zzip_byte_t z_compr[2]; /* compression method */
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zzip_dostime_t z_dostime; /* last mod file time&date (dos format) */
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zzip_byte_t z_crc32[4]; /* crc-32 */
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zzip_byte_t z_csize[4]; /* compressed size */
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zzip_byte_t z_usize[4]; /* uncompressed size */
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zzip_byte_t z_namlen[2]; /* filename length (null if stdin) */
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zzip_byte_t z_extras[2]; /* extra field length */
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zzip_byte_t z_comment[2]; /* file comment length */
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zzip_byte_t z_diskstart[2]; /* disk number of start (if spanning zip over multiple disks) */
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zzip_byte_t z_filetype[2]; /* internal file attributes, bit0 = ascii */
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zzip_byte_t z_filemode[4]; /* extrnal file attributes, eg. msdos attrib byte */
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zzip_byte_t z_offset[4]; /* relative offset of local file header, seekval if singledisk */
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/* followed by filename (of variable size) */
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/* followed by extra field (of variable size) */
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/* followed by file comment (of variable size) */
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} ZZIP_GNUC_PACKED;
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#define zzip_disk_entry_headerlength (4+2+2+2+2+4+4+4+4+2+2+2+2+2+4+4)
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struct zzip_root_dirent
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{ /* the old name of the structure above */
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# define ZZIP_ROOT_DIRENT_MAGIC 0x02014b50
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# define ZZIP_ROOT_DIRENT_CHECKMAGIC(__p) ZZIP_DISK_ENTRY_CHECKMAGIC(__p)
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zzip_byte_t z_magic[4];
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zzip_version_t z_encoder;
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zzip_version_t z_extract;
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zzip_byte_t z_flags[2];
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zzip_byte_t z_compr[2];
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zzip_dostime_t z_dostime;
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zzip_byte_t z_crc32[4];
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zzip_byte_t z_csize[4];
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zzip_byte_t z_usize[4];
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zzip_byte_t z_namlen[2];
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zzip_byte_t z_extras[2];
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zzip_byte_t z_comment[2];
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zzip_byte_t z_diskstart[2];
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zzip_byte_t z_filetype[2];
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zzip_byte_t z_filemode[4];
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zzip_byte_t z_off[4];
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} ZZIP_GNUC_PACKED;
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/* end of central dir record */
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struct zzip_disk_trailer
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{
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# define ZZIP_DISK_TRAILER_MAGIC 0x06054b50
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# define ZZIP_DISK_TRAILER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\5','\6')
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zzip_byte_t z_magic[4]; /* end of central dir signature (0x06054b50) */
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zzip_byte_t z_disk[2]; /* number of this disk */
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zzip_byte_t z_finaldisk[2]; /* number of the disk with the start of the central dir */
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zzip_byte_t z_entries[2]; /* total number of entries in the central dir on this disk */
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zzip_byte_t z_finalentries[2]; /* total number of entries in the central dir */
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zzip_byte_t z_rootsize[4]; /* size of the central directory */
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zzip_byte_t z_rootseek[4]; /* offset of start of central directory with respect to *
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* the starting disk number */
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zzip_byte_t z_comment[2]; /* zipfile comment length */
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/* followed by zipfile comment (of variable size) */
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} ZZIP_GNUC_PACKED;
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#define zzip_disk_trailer_headerlength (4+2+2+2+2+4+4+2)
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/* extra field should be type + size + data + type + size + data ... */
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struct zzip_extra_block
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{ /* fetch.h macros do not need this struct */
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zzip_byte_t z_datatype[2]; /* as input type - a mere <char*> is okay */
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zzip_byte_t z_datasize[2]; /* being returned by xx_to_extras usually */
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} ZZIP_GNUC_PACKED;
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#define zzip_extra_block_headerlength (2+2)
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/* Zip64 end of central dir record */
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struct zzip_disk64_trailer
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{
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# define ZZIP_DISK64_TRAILER_MAGIC 0x06064b50
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# define ZZIP_DISK64_TRAILER_CHECKMAGIC(__p) ZZIP_CHECKMAGIC(__p,'P','K','\6','\6')
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zzip_byte_t z_magic[4]; /* end of central dir signature (0x06054b50) */
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zzip_byte_t z_size[8]; /* size of this central directory record */
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zzip_version_t z_encoder; /* version made by */
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zzip_version_t z_extract; /* version need to extract */
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zzip_byte_t z_disk[4]; /* number of this disk */
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zzip_byte_t z_finaldisk[4]; /* number of the disk with the start of the central dir */
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zzip_byte_t z_entries[8]; /* total number of entries in the central dir on this disk */
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zzip_byte_t z_finalentries[8]; /* total number of entries in the central dir */
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zzip_byte_t z_rootsize[8]; /* size of the central directory */
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zzip_byte_t z_rootseek[8]; /* offset of start of central directory with respect to *
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* the starting disk number */
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/* followed by zip64 extensible data sector (of variable size) */
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} ZZIP_GNUC_PACKED;
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#define zzip_disk64_trailer_headerlength (4+8+2+2+4+4+8+8+8+8)
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/* z_flags */
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#define ZZIP_IS_ENCRYPTED(p) ((*(zzip_byte_t*)p)&1)
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#define ZZIP_IS_COMPRLEVEL(p) (((*(zzip_byte_t*)p)>>1)&3)
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#define ZZIP_IS_STREAMED(p) (((*(zzip_byte_t*)p)>>3)&1)
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#define ZZIP_IS_PATCHED(p) (((*(zzip_byte_t*)p)>>5)&1)
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/* z_compr */
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#define ZZIP_IS_STORED 0
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#define ZZIP_IS_SHRUNK 1
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#define ZZIP_IS_REDUCEDx1 2
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#define ZZIP_IS_REDUCEDx2 3
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#define ZZIP_IS_REDUCEDx3 4
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#define ZZIP_IS_REDUCEDx4 5
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#define ZZIP_IS_IMPLODED 6
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#define ZZIP_IS_TOKENIZED 7
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#define ZZIP_IS_DEFLATED 8
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#define ZZIP_IS_DEFLATED_BETTER 9
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#define ZZIP_IS_IMPLODED_BETTER 10
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/* deflated comprlevel */
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#define ZZIP_DEFLATED_STD_COMPR 0
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#define ZZIP_DEFLATED_MAX_COMPR 1
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#define ZZIP_DEFLATED_LOW_COMPR 2
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#define ZZIP_DEFLATED_MIN_COMPR 3
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# ifdef _MSC_VER
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# pragma pack(pop)
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# endif
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#endif /* _ZZIPFORMAT_H */
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