mirror of
https://github.com/mpv-player/mpv
synced 2024-12-11 17:37:23 +00:00
b1187223a3
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@7034 b3059339-0415-0410-9bf9-f77b7e298cf2
124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
#ifndef BSWAP_H_INCLUDED
|
|
#define BSWAP_H_INCLUDED
|
|
|
|
/*
|
|
* Copyright (C) 2000, 2001 Billy Biggs <vektor@dumbterm.net>,
|
|
* Håkan Hjort <d95hjort@dtek.chalmers.se>
|
|
*
|
|
* This program 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.
|
|
*
|
|
* This program 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 this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#if defined(WORDS_BIGENDIAN)
|
|
/* All bigendian systems are fine, just ignore the swaps. */
|
|
#define B2N_16(x) (void)(x)
|
|
#define B2N_32(x) (void)(x)
|
|
#define B2N_64(x) (void)(x)
|
|
|
|
#else
|
|
|
|
#if defined(__linux__)
|
|
#include <byteswap.h>
|
|
#define B2N_16(x) x = bswap_16(x)
|
|
#define B2N_32(x) x = bswap_32(x)
|
|
#define B2N_64(x) x = bswap_64(x)
|
|
|
|
#elif defined(__NetBSD__)
|
|
#include <sys/endian.h>
|
|
#define B2N_16(x) BE16TOH(x)
|
|
#define B2N_32(x) BE32TOH(x)
|
|
#define B2N_64(x) BE64TOH(x)
|
|
|
|
#elif defined(__OpenBSD__)
|
|
#include <sys/endian.h>
|
|
#define B2N_16(x) x = swap16(x)
|
|
#define B2N_32(x) x = swap32(x)
|
|
#define B2N_64(x) x = swap64(x)
|
|
|
|
#elif defined(ARCH_X86)
|
|
inline static unsigned short bswap_16(unsigned short x)
|
|
{
|
|
__asm("xchgb %b0,%h0" :
|
|
"=q" (x) :
|
|
"0" (x));
|
|
return x;
|
|
}
|
|
#define B2N_16(x) x = bswap_16(x)
|
|
|
|
inline static unsigned int bswap_32(unsigned int x)
|
|
{
|
|
__asm(
|
|
#if __CPU__ > 386
|
|
"bswap %0":
|
|
"=r" (x) :
|
|
#else
|
|
"xchgb %b0,%h0\n"
|
|
" rorl $16,%0\n"
|
|
" xchgb %b0,%h0":
|
|
"=q" (x) :
|
|
#endif
|
|
"0" (x));
|
|
return x;
|
|
}
|
|
#define B2N_32(x) x = bswap_32(x)
|
|
|
|
inline static unsigned long long int bswap_64(unsigned long long int x)
|
|
{
|
|
register union { __extension__ uint64_t __ll;
|
|
uint32_t __l[2]; } __x;
|
|
asm("xchgl %0,%1":
|
|
"=r"(__x.__l[0]),"=r"(__x.__l[1]):
|
|
"0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
|
|
return __x.__ll;
|
|
}
|
|
#define B2N_64(x) x = bswap_64(x)
|
|
|
|
/* This is a slow but portable implementation, it has multiple evaluation
|
|
* problems so beware.
|
|
* FreeBSD and Solaris don't have <byteswap.h> or any other such
|
|
* functionality!
|
|
*/
|
|
|
|
#elif defined(__FreeBSD__) || defined(__sun) || defined(__bsdi__) || defined(__CYGWIN__)
|
|
#define B2N_16(x) \
|
|
x = ((((x) & 0xff00) >> 8) | \
|
|
(((x) & 0x00ff) << 8))
|
|
#define B2N_32(x) \
|
|
x = ((((x) & 0xff000000) >> 24) | \
|
|
(((x) & 0x00ff0000) >> 8) | \
|
|
(((x) & 0x0000ff00) << 8) | \
|
|
(((x) & 0x000000ff) << 24))
|
|
#define B2N_64(x) \
|
|
x = ((((x) & 0xff00000000000000) >> 56) | \
|
|
(((x) & 0x00ff000000000000) >> 40) | \
|
|
(((x) & 0x0000ff0000000000) >> 24) | \
|
|
(((x) & 0x000000ff00000000) >> 8) | \
|
|
(((x) & 0x00000000ff000000) << 8) | \
|
|
(((x) & 0x0000000000ff0000) << 24) | \
|
|
(((x) & 0x000000000000ff00) << 40) | \
|
|
(((x) & 0x00000000000000ff) << 56))
|
|
|
|
#else
|
|
|
|
/* If there isn't a header provided with your system with this functionality
|
|
* add the relevant || define( ) to the portable implementation above.
|
|
*/
|
|
#error "You need to add endian swap macros for you're system"
|
|
|
|
#endif
|
|
|
|
#endif /* WORDS_BIGENDIAN */
|
|
|
|
#endif /* BSWAP_H_INCLUDED */
|