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Diffstat (limited to 'libdvdread/bswap.h')
| -rw-r--r-- | libdvdread/bswap.h | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/libdvdread/bswap.h b/libdvdread/bswap.h new file mode 100644 index 0000000000..f121b06104 --- /dev/null +++ b/libdvdread/bswap.h @@ -0,0 +1,144 @@ +#ifndef BSWAP_H_INCLUDED +#define BSWAP_H_INCLUDED + +/* + * Copyright (C) 2000, 2001 Billy Biggs <vektor@dumbterm.net>, + * Håkan Hjort <d95hjort@dtek.chalmers.se> + * + * Modified for use with MPlayer, changes contained in libdvdread_changes.diff. + * detailed changelog at http://svn.mplayerhq.hu/mplayer/trunk/ + * $Id$ + * + * 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 + +/* For __FreeBSD_version */ +#if defined(HAVE_SYS_PARAM_H) +#include <sys/param.h> +#endif + +#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(__FreeBSD__) && __FreeBSD_version >= 470000 +#include <sys/endian.h> +#define B2N_16(x) x = be16toh(x) +#define B2N_32(x) x = be32toh(x) +#define B2N_64(x) x = be64toh(x) + +#elif defined(__DragonFly__) +#include <sys/endian.h> +#define B2N_16(x) x = be16toh(x) +#define B2N_32(x) x = be32toh(x) +#define B2N_64(x) x = be64toh(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. + * Old FreeBSD's 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 */ |