dvdread/bswap.h

   1 #ifndef BSWAP_H_INCLUDED
   2 #define BSWAP_H_INCLUDED
   3
   4 /*
   5  * Copyright (C) 2000, 2001 Billy Biggs <vektor@dumbterm.net>,
   6  *                          Håkan Hjort <d95hjort@dtek.chalmers.se>
   7  *
   8  * Modified for use with MPlayer, changes contained in libdvdread_changes.diff.
   9  * detailed changelog at http://svn.mplayerhq.hu/mplayer/trunk/
  10  * $Id$
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  */
  26
  27 #include <config.h>
  28
  29 #if defined(WORDS_BIGENDIAN)
  30 /* All bigendian systems are fine, just ignore the swaps. */
  31 #define B2N_16(x) (void)(x)
  32 #define B2N_32(x) (void)(x)
  33 #define B2N_64(x) (void)(x)
  34
  35 #else
  36
  37 /* For __FreeBSD_version */
  38 #if defined(HAVE_SYS_PARAM_H)
  39 #include <sys/param.h>
  40 #endif
  41
  42 #if defined(__linux__)
  43 #include <byteswap.h>
  44 #define B2N_16(x) x = bswap_16(x)
  45 #define B2N_32(x) x = bswap_32(x)
  46 #define B2N_64(x) x = bswap_64(x)
  47
  48 #elif defined(__NetBSD__)
  49 #include <sys/endian.h>
  50 #define B2N_16(x) BE16TOH(x)
  51 #define B2N_32(x) BE32TOH(x)
  52 #define B2N_64(x) BE64TOH(x)
  53
  54 #elif defined(__OpenBSD__)
  55 #include <sys/endian.h>
  56 #define B2N_16(x) x = swap16(x)
  57 #define B2N_32(x) x = swap32(x)
  58 #define B2N_64(x) x = swap64(x)
  59
  60 #elif defined(__FreeBSD__) && __FreeBSD_version >= 470000
  61 #include <sys/endian.h>
  62 #define B2N_16(x) x = be16toh(x)
  63 #define B2N_32(x) x = be32toh(x)
  64 #define B2N_64(x) x = be64toh(x)
  65
  66 #elif defined(__DragonFly__)
  67 #include <sys/endian.h>
  68 #define B2N_16(x) x = be16toh(x)
  69 #define B2N_32(x) x = be32toh(x)
  70 #define B2N_64(x) x = be64toh(x)
  71
  72 #elif defined(ARCH_X86)
  73 inline static unsigned short bswap_16(unsigned short x)
  74 {
  75   __asm("xchgb %b0,%h0" :
  76         "=q" (x)        :
  77         "0" (x));
  78     return x;
  79 }
  80 #define B2N_16(x) x = bswap_16(x)
  81
  82 inline static unsigned int bswap_32(unsigned int x)
  83 {
  84  __asm(
  85 #if __CPU__ != 386
  86       "bswap   %0":
  87       "=r" (x)     :
  88 #else
  89       "xchgb   %b0,%h0\n"
  90       " rorl    $16,%0\n"
  91       " xchgb   %b0,%h0":
  92       "=q" (x)          :
  93 #endif
  94       "0" (x));
  95   return x;
  96 }
  97 #define B2N_32(x) x = bswap_32(x)
  98
  99 inline static unsigned long long int bswap_64(unsigned long long int x)
 100 {
 101   register union { __extension__ uint64_t __ll;
 102           uint32_t __l[2]; } __x;
 103   asm("xchgl    %0,%1":
 104       "=r"(__x.__l[0]),"=r"(__x.__l[1]):
 105       "0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
 106   return __x.__ll;
 107 }
 108 #define B2N_64(x) x = bswap_64(x)
 109
 110 /* This is a slow but portable implementation, it has multiple evaluation
 111  * problems so beware.
 112  * Old FreeBSD's and Solaris don't have <byteswap.h> or any other such
 113  * functionality!
 114  */
 115
 116 #elif defined(__FreeBSD__) || defined(__sun) || defined(__bsdi__) || defined(__CYGWIN__)
 117 #define B2N_16(x) \
 118  x = ((((x) & 0xff00) >> 8) | \
 119       (((x) & 0x00ff) << 8))
 120 #define B2N_32(x) \
 121  x = ((((x) & 0xff000000) >> 24) | \
 122       (((x) & 0x00ff0000) >>  8) | \
 123       (((x) & 0x0000ff00) <<  8) | \
 124       (((x) & 0x000000ff) << 24))
 125 #define B2N_64(x) \
 126  x = ((((x) & 0xff00000000000000) >> 56) | \
 127       (((x) & 0x00ff000000000000) >> 40) | \
 128       (((x) & 0x0000ff0000000000) >> 24) | \
 129       (((x) & 0x000000ff00000000) >>  8) | \
 130       (((x) & 0x00000000ff000000) <<  8) | \
 131       (((x) & 0x0000000000ff0000) << 24) | \
 132       (((x) & 0x000000000000ff00) << 40) | \
 133       (((x) & 0x00000000000000ff) << 56))
 134
 135 #else
 136
 137 /* If there isn't a header provided with your system with this functionality
 138  * add the relevant || define( ) to the portable implementation above.
 139  */
 140 #error "You need to add endian swap macros for you're system"
 141
 142 #endif
 143
 144 #endif /* WORDS_BIGENDIAN */
 145
 146 #endif /* BSWAP_H_INCLUDED */