pelya
157 lines
5.0 KiB
C
157 lines
5.0 KiB
C
/* lzo_ptr.h -- low-level pointer constructs
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This file is part of the LZO real-time data compression library.
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Copyright (C) 2010 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 2009 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
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All Rights Reserved.
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The LZO library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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The LZO library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the LZO library; see the file COPYING.
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If not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Markus F.X.J. Oberhumer
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<markus@oberhumer.com>
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http://www.oberhumer.com/opensource/lzo/
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*/
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/* WARNING: this file should *not* be used by applications. It is
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part of the implementation of the library and is subject
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to change.
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*/
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#ifndef __LZO_PTR_H
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#define __LZO_PTR_H 1
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#ifdef __cplusplus
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extern "C" {
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#endif
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/***********************************************************************
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// Integral types
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************************************************************************/
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#if !defined(lzo_uintptr_t)
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# if (__LZO_MMODEL_HUGE)
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# define lzo_uintptr_t unsigned long
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# else
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# define lzo_uintptr_t acc_uintptr_t
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# ifdef __ACC_INTPTR_T_IS_POINTER
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# define __LZO_UINTPTR_T_IS_POINTER 1
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# endif
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# endif
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#endif
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/***********************************************************************
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//
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************************************************************************/
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/* Always use the safe (=integral) version for pointer-comparisions.
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* The compiler should optimize away the additional casts anyway.
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*
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* Note that this only works if the representation and ordering
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* of the pointer and the integral is the same (at bit level).
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*
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* Most 16-bit compilers have their own view about pointers -
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* fortunately they don't care about comparing pointers
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* that are pointing to Nirvana.
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*/
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#if (LZO_ARCH_I086)
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#define PTR(a) ((lzo_bytep) (a))
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/* only need the low bits of the pointer -> offset is ok */
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#define PTR_ALIGNED_4(a) ((ACC_PTR_FP_OFF(a) & 3) == 0)
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#define PTR_ALIGNED2_4(a,b) (((ACC_PTR_FP_OFF(a) | ACC_PTR_FP_OFF(b)) & 3) == 0)
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#elif (LZO_MM_PVP)
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#define PTR(a) ((lzo_bytep) (a))
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#define PTR_ALIGNED_8(a) ((((lzo_uintptr_t)(a)) >> 61) == 0)
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#define PTR_ALIGNED2_8(a,b) ((((lzo_uintptr_t)(a)|(lzo_uintptr_t)(b)) >> 61) == 0)
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#else
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#define PTR(a) ((lzo_uintptr_t) (a))
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#define PTR_LINEAR(a) PTR(a)
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#define PTR_ALIGNED_4(a) ((PTR_LINEAR(a) & 3) == 0)
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#define PTR_ALIGNED_8(a) ((PTR_LINEAR(a) & 7) == 0)
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#define PTR_ALIGNED2_4(a,b) (((PTR_LINEAR(a) | PTR_LINEAR(b)) & 3) == 0)
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#define PTR_ALIGNED2_8(a,b) (((PTR_LINEAR(a) | PTR_LINEAR(b)) & 7) == 0)
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#endif
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#define PTR_LT(a,b) (PTR(a) < PTR(b))
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#define PTR_GE(a,b) (PTR(a) >= PTR(b))
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#define PTR_DIFF(a,b) (PTR(a) - PTR(b))
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#define pd(a,b) ((lzo_uint) ((a)-(b)))
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LZO_EXTERN(lzo_uintptr_t)
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__lzo_ptr_linear(const lzo_voidp ptr);
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typedef union
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{
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char a_char;
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unsigned char a_uchar;
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short a_short;
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unsigned short a_ushort;
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int a_int;
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unsigned int a_uint;
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long a_long;
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unsigned long a_ulong;
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lzo_int a_lzo_int;
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lzo_uint a_lzo_uint;
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lzo_int32 a_lzo_int32;
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lzo_uint32 a_lzo_uint32;
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ptrdiff_t a_ptrdiff_t;
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lzo_uintptr_t a_lzo_uintptr_t;
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lzo_voidp a_lzo_voidp;
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void * a_void_p;
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lzo_bytep a_lzo_bytep;
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lzo_bytepp a_lzo_bytepp;
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lzo_uintp a_lzo_uintp;
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lzo_uint * a_lzo_uint_p;
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lzo_uint32p a_lzo_uint32p;
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lzo_uint32 * a_lzo_uint32_p;
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unsigned char * a_uchar_p;
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char * a_char_p;
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}
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lzo_full_align_t;
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* already included */
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/*
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vi:ts=4:et
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*/
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