libavutil/intreadwrite.h

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #ifndef FFMPEG_INTREADWRITE_H
  20 #define FFMPEG_INTREADWRITE_H
  21
  22 #include <stdint.h>
  23 #include "config.h"
  24 #include "bswap.h"
  25
  26 #ifdef __GNUC__
  27
  28 struct unaligned_64 { uint64_t l; } __attribute__((packed));
  29 struct unaligned_32 { uint32_t l; } __attribute__((packed));
  30 struct unaligned_16 { uint16_t l; } __attribute__((packed));
  31
  32 #define AV_RN16(a) (((const struct unaligned_16 *) (a))->l)
  33 #define AV_RN32(a) (((const struct unaligned_32 *) (a))->l)
  34 #define AV_RN64(a) (((const struct unaligned_64 *) (a))->l)
  35
  36 #define AV_WN16(a, b) (((struct unaligned_16 *) (a))->l) = (b)
  37 #define AV_WN32(a, b) (((struct unaligned_32 *) (a))->l) = (b)
  38 #define AV_WN64(a, b) (((struct unaligned_64 *) (a))->l) = (b)
  39
  40 #else /* __GNUC__ */
  41
  42 #define AV_RN16(a) (*((const uint16_t*)(a)))
  43 #define AV_RN32(a) (*((const uint32_t*)(a)))
  44 #define AV_RN64(a) (*((const uint64_t*)(a)))
  45
  46 #define AV_WN16(a, b) *((uint16_t*)(a)) = (b)
  47 #define AV_WN32(a, b) *((uint32_t*)(a)) = (b)
  48 #define AV_WN64(a, b) *((uint64_t*)(a)) = (b)
  49
  50 #endif /* !__GNUC__ */
  51
  52 /* endian macros */
  53 #define AV_RB8(x)     (((const uint8_t*)(x))[0])
  54 #define AV_WB8(p, d)  do { ((uint8_t*)(p))[0] = (d); } while(0)
  55
  56 #define AV_RL8(x)     AV_RB8(x)
  57 #define AV_WL8(p, d)  AV_WB8(p, d)
  58
  59 #ifdef HAVE_FAST_UNALIGNED
  60 # ifdef WORDS_BIGENDIAN
  61 #  define AV_RB16(x)    AV_RN16(x)
  62 #  define AV_WB16(p, d) AV_WN16(p, d)
  63
  64 #  define AV_RL16(x)    bswap_16(AV_RN16(x))
  65 #  define AV_WL16(p, d) AV_WN16(p, bswap_16(d))
  66 # else /* WORDS_BIGENDIAN */
  67 #  define AV_RB16(x)    bswap_16(AV_RN16(x))
  68 #  define AV_WB16(p, d) AV_WN16(p, bswap_16(d))
  69
  70 #  define AV_RL16(x)    AV_RN16(x)
  71 #  define AV_WL16(p, d) AV_WN16(p, d)
  72 # endif
  73 #else /* HAVE_FAST_UNALIGNED */
  74 #define AV_RB16(x)  ((((const uint8_t*)(x))[0] << 8) | ((const uint8_t*)(x))[1])
  75 #define AV_WB16(p, d) do { \
  76                     ((uint8_t*)(p))[1] = (d); \
  77                     ((uint8_t*)(p))[0] = (d)>>8; } while(0)
  78
  79 #define AV_RL16(x)  ((((const uint8_t*)(x))[1] << 8) | \
  80                       ((const uint8_t*)(x))[0])
  81 #define AV_WL16(p, d) do { \
  82                     ((uint8_t*)(p))[0] = (d); \
  83                     ((uint8_t*)(p))[1] = (d)>>8; } while(0)
  84 #endif
  85
  86 #define AV_RB24(x)  ((((const uint8_t*)(x))[0] << 16) | \
  87                      (((const uint8_t*)(x))[1] <<  8) | \
  88                       ((const uint8_t*)(x))[2])
  89 #define AV_WB24(p, d) do { \
  90                     ((uint8_t*)(p))[2] = (d); \
  91                     ((uint8_t*)(p))[1] = (d)>>8; \
  92                     ((uint8_t*)(p))[0] = (d)>>16; } while(0)
  93
  94 #define AV_RL24(x)  ((((const uint8_t*)(x))[2] << 16) | \
  95                      (((const uint8_t*)(x))[1] <<  8) | \
  96                       ((const uint8_t*)(x))[0])
  97 #define AV_WL24(p, d) do { \
  98                     ((uint8_t*)(p))[0] = (d); \
  99                     ((uint8_t*)(p))[1] = (d)>>8; \
 100                     ((uint8_t*)(p))[2] = (d)>>16; } while(0)
 101
 102 #ifdef HAVE_FAST_UNALIGNED
 103 # ifdef WORDS_BIGENDIAN
 104 #  define AV_RB32(x)    AV_RN32(x)
 105 #  define AV_WB32(p, d) AV_WN32(p, d)
 106
 107 #  define AV_RL32(x)    bswap_32(AV_RN32(x))
 108 #  define AV_WL32(p, d) AV_WN32(p, bswap_32(d))
 109 # else /* WORDS_BIGENDIAN */
 110 #  define AV_RB32(x)    bswap_32(AV_RN32(x))
 111 #  define AV_WB32(p, d) AV_WN32(p, bswap_32(d))
 112
 113 #  define AV_RL32(x)    AV_RN32(x)
 114 #  define AV_WL32(p, d) AV_WN32(p, d)
 115 # endif
 116 #else /* HAVE_FAST_UNALIGNED */
 117 #define AV_RB32(x)  ((((const uint8_t*)(x))[0] << 24) | \
 118                      (((const uint8_t*)(x))[1] << 16) | \
 119                      (((const uint8_t*)(x))[2] <<  8) | \
 120                       ((const uint8_t*)(x))[3])
 121 #define AV_WB32(p, d) do { \
 122                     ((uint8_t*)(p))[3] = (d); \
 123                     ((uint8_t*)(p))[2] = (d)>>8; \
 124                     ((uint8_t*)(p))[1] = (d)>>16; \
 125                     ((uint8_t*)(p))[0] = (d)>>24; } while(0)
 126
 127 #define AV_RL32(x) ((((const uint8_t*)(x))[3] << 24) | \
 128                     (((const uint8_t*)(x))[2] << 16) | \
 129                     (((const uint8_t*)(x))[1] <<  8) | \
 130                      ((const uint8_t*)(x))[0])
 131 #define AV_WL32(p, d) do { \
 132                     ((uint8_t*)(p))[0] = (d); \
 133                     ((uint8_t*)(p))[1] = (d)>>8; \
 134                     ((uint8_t*)(p))[2] = (d)>>16; \
 135                     ((uint8_t*)(p))[3] = (d)>>24; } while(0)
 136 #endif
 137
 138 #ifdef HAVE_FAST_UNALIGNED
 139 # ifdef WORDS_BIGENDIAN
 140 #  define AV_RB64(x)    AV_RN64(x)
 141 #  define AV_WB64(p, d) AV_WN64(p, d)
 142
 143 #  define AV_RL64(x)    bswap_64(AV_RN64(x))
 144 #  define AV_WL64(p, d) AV_WN64(p, bswap_64(d))
 145 # else /* WORDS_BIGENDIAN */
 146 #  define AV_RB64(x)    bswap_64(AV_RN64(x))
 147 #  define AV_WB64(p, d) AV_WN64(p, bswap_64(d))
 148
 149 #  define AV_RL64(x)    AV_RN64(x)
 150 #  define AV_WL64(p, d) AV_WN64(p, d)
 151 # endif
 152 #else /* HAVE_FAST_UNALIGNED */
 153 #define AV_RB64(x)  (((uint64_t)((const uint8_t*)(x))[0] << 56) | \
 154                      ((uint64_t)((const uint8_t*)(x))[1] << 48) | \
 155                      ((uint64_t)((const uint8_t*)(x))[2] << 40) | \
 156                      ((uint64_t)((const uint8_t*)(x))[3] << 32) | \
 157                      ((uint64_t)((const uint8_t*)(x))[4] << 24) | \
 158                      ((uint64_t)((const uint8_t*)(x))[5] << 16) | \
 159                      ((uint64_t)((const uint8_t*)(x))[6] <<  8) | \
 160                       (uint64_t)((const uint8_t*)(x))[7])
 161 #define AV_WB64(p, d) do { \
 162                     ((uint8_t*)(p))[7] = (d);     \
 163                     ((uint8_t*)(p))[6] = (d)>>8;  \
 164                     ((uint8_t*)(p))[5] = (d)>>16; \
 165                     ((uint8_t*)(p))[4] = (d)>>24; \
 166                     ((uint8_t*)(p))[3] = (d)>>32; \
 167                     ((uint8_t*)(p))[2] = (d)>>40; \
 168                     ((uint8_t*)(p))[1] = (d)>>48; \
 169                     ((uint8_t*)(p))[0] = (d)>>56; } while(0)
 170
 171 #define AV_RL64(x)  (((uint64_t)((const uint8_t*)(x))[7] << 56) | \
 172                      ((uint64_t)((const uint8_t*)(x))[6] << 48) | \
 173                      ((uint64_t)((const uint8_t*)(x))[5] << 40) | \
 174                      ((uint64_t)((const uint8_t*)(x))[4] << 32) | \
 175                      ((uint64_t)((const uint8_t*)(x))[3] << 24) | \
 176                      ((uint64_t)((const uint8_t*)(x))[2] << 16) | \
 177                      ((uint64_t)((const uint8_t*)(x))[1] <<  8) | \
 178                       (uint64_t)((const uint8_t*)(x))[0])
 179 #define AV_WL64(p, d) do { \
 180                     ((uint8_t*)(p))[0] = (d);     \
 181                     ((uint8_t*)(p))[1] = (d)>>8;  \
 182                     ((uint8_t*)(p))[2] = (d)>>16; \
 183                     ((uint8_t*)(p))[3] = (d)>>24; \
 184                     ((uint8_t*)(p))[4] = (d)>>32; \
 185                     ((uint8_t*)(p))[5] = (d)>>40; \
 186                     ((uint8_t*)(p))[6] = (d)>>48; \
 187                     ((uint8_t*)(p))[7] = (d)>>56; } while(0)
 188 #endif
 189
 190 #endif /* FFMPEG_INTREADWRITE_H */