mirror of
https://github.com/mpv-player/mpv
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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
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#define BSWAP_H_INCLUDED
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/*
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* Copyright (C) 2000, 2001 Billy Biggs <vektor@dumbterm.net>,
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* Håkan Hjort <d95hjort@dtek.chalmers.se>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#if defined(WORDS_BIGENDIAN)
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/* All bigendian systems are fine, just ignore the swaps. */
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#define B2N_16(x) (void)(x)
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#define B2N_32(x) (void)(x)
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#define B2N_64(x) (void)(x)
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#else
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#if defined(__linux__)
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#include <byteswap.h>
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#define B2N_16(x) x = bswap_16(x)
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#define B2N_32(x) x = bswap_32(x)
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#define B2N_64(x) x = bswap_64(x)
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#elif defined(__NetBSD__)
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#include <sys/endian.h>
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#define B2N_16(x) BE16TOH(x)
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#define B2N_32(x) BE32TOH(x)
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#define B2N_64(x) BE64TOH(x)
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#elif defined(__OpenBSD__)
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#include <sys/endian.h>
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#define B2N_16(x) x = swap16(x)
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#define B2N_32(x) x = swap32(x)
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#define B2N_64(x) x = swap64(x)
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#elif defined(ARCH_X86)
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inline static unsigned short bswap_16(unsigned short x)
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{
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__asm("xchgb %b0,%h0" :
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"=q" (x) :
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"0" (x));
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return x;
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}
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#define B2N_16(x) x = bswap_16(x)
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inline static unsigned int bswap_32(unsigned int x)
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{
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__asm(
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#if __CPU__ > 386
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"bswap %0":
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"=r" (x) :
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#else
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"xchgb %b0,%h0\n"
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" rorl $16,%0\n"
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" xchgb %b0,%h0":
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"=q" (x) :
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#endif
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"0" (x));
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return x;
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}
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#define B2N_32(x) x = bswap_32(x)
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inline static unsigned long long int bswap_64(unsigned long long int x)
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{
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register union { __extension__ uint64_t __ll;
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uint32_t __l[2]; } __x;
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asm("xchgl %0,%1":
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"=r"(__x.__l[0]),"=r"(__x.__l[1]):
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"0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
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return __x.__ll;
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}
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#define B2N_64(x) x = bswap_64(x)
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/* This is a slow but portable implementation, it has multiple evaluation
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* problems so beware.
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* FreeBSD and Solaris don't have <byteswap.h> or any other such
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* functionality!
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*/
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#elif defined(__FreeBSD__) || defined(__sun) || defined(__bsdi__) || defined(__CYGWIN__)
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#define B2N_16(x) \
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x = ((((x) & 0xff00) >> 8) | \
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(((x) & 0x00ff) << 8))
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#define B2N_32(x) \
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x = ((((x) & 0xff000000) >> 24) | \
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(((x) & 0x00ff0000) >> 8) | \
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(((x) & 0x0000ff00) << 8) | \
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(((x) & 0x000000ff) << 24))
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#define B2N_64(x) \
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x = ((((x) & 0xff00000000000000) >> 56) | \
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(((x) & 0x00ff000000000000) >> 40) | \
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(((x) & 0x0000ff0000000000) >> 24) | \
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(((x) & 0x000000ff00000000) >> 8) | \
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(((x) & 0x00000000ff000000) << 8) | \
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(((x) & 0x0000000000ff0000) << 24) | \
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(((x) & 0x000000000000ff00) << 40) | \
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(((x) & 0x00000000000000ff) << 56))
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#else
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/* If there isn't a header provided with your system with this functionality
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* add the relevant || define( ) to the portable implementation above.
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*/
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#error "You need to add endian swap macros for you're system"
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#endif
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#endif /* WORDS_BIGENDIAN */
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#endif /* BSWAP_H_INCLUDED */
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