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/* lzo_ptr.h -- low-level pointer constructs
This file is part of the LZO real-time data compression library.
Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
The LZO library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
The LZO 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with the LZO library; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Markus F.X.J. Oberhumer
<markus@oberhumer.com>
http://www.oberhumer.com/opensource/lzo/
*/
/* WARNING: this file should *not* be used by applications. It is
part of the implementation of the library and is subject
to change.
*/
#ifndef __LZO_PTR_H
#define __LZO_PTR_H
#ifdef __cplusplus
extern "C" {
#endif
/***********************************************************************
// Integral types
************************************************************************/
#if !defined(lzo_uintptr_t)
# if defined(__LZO_MMODEL_HUGE)
# define lzo_uintptr_t unsigned long
# else
# define lzo_uintptr_t acc_uintptr_t
# ifdef __ACC_INTPTR_T_IS_POINTER
# define __LZO_UINTPTR_T_IS_POINTER 1
# endif
# endif
#endif
/***********************************************************************
//
************************************************************************/
/* Always use the safe (=integral) version for pointer-comparisions.
* The compiler should optimize away the additional casts anyway.
*
* Note that this only works if the representation and ordering
* of the pointer and the integral is the same (at bit level).
*
* Most 16-bit compilers have their own view about pointers -
* fortunately they don't care about comparing pointers
* that are pointing to Nirvana.
*/
#if (LZO_ARCH_I086)
#define PTR(a) ((lzo_bytep) (a))
/* only need the low bits of the pointer -> offset is ok */
#define PTR_ALIGNED_4(a) ((ACC_PTR_FP_OFF(a) & 3) == 0)
#define PTR_ALIGNED2_4(a,b) (((ACC_PTR_FP_OFF(a) | ACC_PTR_FP_OFF(b)) & 3) == 0)
#elif (LZO_MM_PVP)
#define PTR(a) ((lzo_bytep) (a))
#define PTR_ALIGNED_8(a) ((((lzo_uintptr_t)(a)) >> 61) == 0)
#define PTR_ALIGNED2_8(a,b) ((((lzo_uintptr_t)(a)|(lzo_uintptr_t)(b)) >> 61) == 0)
#else
#define PTR(a) ((lzo_uintptr_t) (a))
#define PTR_LINEAR(a) PTR(a)
#define PTR_ALIGNED_4(a) ((PTR_LINEAR(a) & 3) == 0)
#define PTR_ALIGNED_8(a) ((PTR_LINEAR(a) & 7) == 0)
#define PTR_ALIGNED2_4(a,b) (((PTR_LINEAR(a) | PTR_LINEAR(b)) & 3) == 0)
#define PTR_ALIGNED2_8(a,b) (((PTR_LINEAR(a) | PTR_LINEAR(b)) & 7) == 0)
#endif
#define PTR_LT(a,b) (PTR(a) < PTR(b))
#define PTR_GE(a,b) (PTR(a) >= PTR(b))
#define PTR_DIFF(a,b) (PTR(a) - PTR(b))
#define pd(a,b) ((lzo_uint) ((a)-(b)))
LZO_EXTERN(lzo_uintptr_t)
__lzo_ptr_linear(const lzo_voidp ptr);
typedef union
{
char a_char;
unsigned char a_uchar;
short a_short;
unsigned short a_ushort;
int a_int;
unsigned int a_uint;
long a_long;
unsigned long a_ulong;
lzo_int a_lzo_int;
lzo_uint a_lzo_uint;
lzo_int32 a_lzo_int32;
lzo_uint32 a_lzo_uint32;
ptrdiff_t a_ptrdiff_t;
lzo_uintptr_t a_lzo_uintptr_t;
lzo_voidp a_lzo_voidp;
void * a_void_p;
lzo_bytep a_lzo_bytep;
lzo_bytepp a_lzo_bytepp;
lzo_uintp a_lzo_uintp;
lzo_uint * a_lzo_uint_p;
lzo_uint32p a_lzo_uint32p;
lzo_uint32 * a_lzo_uint32_p;
unsigned char * a_uchar_p;
char * a_char_p;
}
lzo_full_align_t;
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* already included */
/*
vi:ts=4:et
*/
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