libdvdread4/bswap.h

   1 /*
   2  * Copyright (C) 2000, 2001 Billy Biggs <vektor@dumbterm.net>,
   3  *                          Håkan Hjort <d95hjort@dtek.chalmers.se>
   4  *
   5  * This file is part of libdvdread.
   6  *
   7  * libdvdread is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * libdvdread is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with libdvdread; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #ifndef LIBDVDREAD_BSWAP_H
  23 #define LIBDVDREAD_BSWAP_H
  24
  25 #include <config.h>
  26
  27 #if defined(WORDS_BIGENDIAN)
  28 /* All bigendian systems are fine, just ignore the swaps. */
  29 #define B2N_16(x) (void)(x)
  30 #define B2N_32(x) (void)(x)
  31 #define B2N_64(x) (void)(x)
  32
  33 #else
  34
  35 /* For __FreeBSD_version */
  36 #if defined(HAVE_SYS_PARAM_H)
  37 #include <sys/param.h>
  38 #endif
  39
  40 #if defined(__linux__) || defined(__GLIBC__)
  41 #include <byteswap.h>
  42 #define B2N_16(x) x = bswap_16(x)
  43 #define B2N_32(x) x = bswap_32(x)
  44 #define B2N_64(x) x = bswap_64(x)
  45
  46 #elif defined(__APPLE__)
  47 #include <libkern/OSByteOrder.h>
  48 #define B2N_16(x) x = OSSwapBigToHostInt16(x)
  49 #define B2N_32(x) x = OSSwapBigToHostInt32(x)
  50 #define B2N_64(x) x = OSSwapBigToHostInt64(x)
  51
  52 #elif defined(__NetBSD__)
  53 #include <sys/endian.h>
  54 #define B2N_16(x) BE16TOH(x)
  55 #define B2N_32(x) BE32TOH(x)
  56 #define B2N_64(x) BE64TOH(x)
  57
  58 #elif defined(__OpenBSD__)
  59 #include <sys/endian.h>
  60 #define B2N_16(x) x = swap16(x)
  61 #define B2N_32(x) x = swap32(x)
  62 #define B2N_64(x) x = swap64(x)
  63
  64 #elif defined(__FreeBSD__) && __FreeBSD_version >= 470000
  65 #include <sys/endian.h>
  66 #define B2N_16(x) x = be16toh(x)
  67 #define B2N_32(x) x = be32toh(x)
  68 #define B2N_64(x) x = be64toh(x)
  69
  70 /* This is a slow but portable implementation, it has multiple evaluation
  71  * problems so beware.
  72  * Old FreeBSD's and Solaris don't have <byteswap.h> or any other such
  73  * functionality!
  74  */
  75
  76 #elif defined(__FreeBSD__) || defined(__sun) || defined(__bsdi__) || defined(WIN32) || defined(__CYGWIN__) || defined(__BEOS__) || defined(__OS2__)
  77 #define B2N_16(x)                             \
  78  x = ((((x) & 0xff00) >> 8) |                 \
  79       (((x) & 0x00ff) << 8))
  80 #define B2N_32(x)                             \
  81  x = ((((x) & 0xff000000) >> 24) |            \
  82       (((x) & 0x00ff0000) >>  8) |            \
  83       (((x) & 0x0000ff00) <<  8) |            \
  84       (((x) & 0x000000ff) << 24))
  85 #define B2N_64(x)                             \
  86  x = ((((x) & 0xff00000000000000ULL) >> 56) | \
  87       (((x) & 0x00ff000000000000ULL) >> 40) | \
  88       (((x) & 0x0000ff0000000000ULL) >> 24) | \
  89       (((x) & 0x000000ff00000000ULL) >>  8) | \
  90       (((x) & 0x00000000ff000000ULL) <<  8) | \
  91       (((x) & 0x0000000000ff0000ULL) << 24) | \
  92       (((x) & 0x000000000000ff00ULL) << 40) | \
  93       (((x) & 0x00000000000000ffULL) << 56))
  94
  95 #else
  96
  97 /* If there isn't a header provided with your system with this functionality
  98  * add the relevant || define( ) to the portable implementation above.
  99  */
 100 #error "You need to add endian swap macros for you're system"
 101
 102 #endif
 103
 104 #endif /* WORDS_BIGENDIAN */
 105
 106 #endif /* LIBDVDREAD_BSWAP_H */