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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) 1996-2014 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 1
#ifdef __cplusplus
extern "C" {
#endif
/***********************************************************************
//
************************************************************************/
/* Always use the safe (=integral) version for pointer-comparisons.
* 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).
*/
#if (LZO_ARCH_I086)
#error "LZO_ARCH_I086 is unsupported"
#elif (LZO_MM_PVP)
#error "LZO_MM_PVP is unsupported"
#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_xint a_lzo_xint;
lzo_int16_t a_lzo_int16_t;
lzo_uint16_t a_lzo_uint16_t;
lzo_int32_t a_lzo_int32_t;
lzo_uint32_t a_lzo_uint32_t;
#if defined(lzo_uint64_t)
lzo_int64_t a_lzo_int64_t;
lzo_uint64_t a_lzo_uint64_t;
#endif
size_t a_size_t;
ptrdiff_t a_ptrdiff_t;
lzo_uintptr_t a_lzo_uintptr_t;
void * a_void_p;
char * a_char_p;
unsigned char * a_uchar_p;
const void * a_c_void_p;
const char * a_c_char_p;
const unsigned char * a_c_uchar_p;
lzo_voidp a_lzo_voidp;
lzo_bytep a_lzo_bytep;
const lzo_voidp a_c_lzo_voidp;
const lzo_bytep a_c_lzo_bytep;
}
lzo_full_align_t;
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* already included */
/*
vi:ts=4:et
*/
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