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 AVUTIL_INTREADWRITE_H
  20 #define AVUTIL_INTREADWRITE_H
  21
  22 #include <stdint.h>
  23 #include "config.h"
  24 #include "bswap.h"
  25
  26 /*
  27  * Arch-specific headers can provide any combination of
  28  * AV_[RW][BLN](16|32|64) macros.  Preprocessor symbols must be
  29  * defined, even if these are implemented as inline functions.
  30  */
  31
  32 #if   ARCH_ARM
  33 #   include "arm/intreadwrite.h"
  34 #elif ARCH_MIPS
  35 #   include "mips/intreadwrite.h"
  36 #elif ARCH_PPC
  37 #   include "ppc/intreadwrite.h"
  38 #endif
  39
  40 /*
  41  * Define AV_[RW]N helper macros to simplify definitions not provided
  42  * by per-arch headers.
  43  */
  44
  45 #if   HAVE_ATTRIBUTE_PACKED
  46
  47 struct unaligned_64 { uint64_t l; } __attribute__((packed));
  48 struct unaligned_32 { uint32_t l; } __attribute__((packed));
  49 struct unaligned_16 { uint16_t l; } __attribute__((packed));
  50
  51 #   define AV_RN(s, p) (((const struct unaligned_##s *) (p))->l)
  52 #   define AV_WN(s, p, v) (((struct unaligned_##s *) (p))->l) = (v)
  53
  54 #elif defined(__DECC)
  55
  56 #   define AV_RN(s, p) (*((const __unaligned uint##s##_t*)(p)))
  57 #   define AV_WN(s, p, v) *((__unaligned uint##s##_t*)(p)) = (v)
  58
  59 #elif HAVE_FAST_UNALIGNED
  60
  61 #   define AV_RN(s, p) (*((const uint##s##_t*)(p)))
  62 #   define AV_WN(s, p, v) *((uint##s##_t*)(p)) = (v)
  63
  64 #else
  65
  66 #ifndef AV_RB16
  67 #define AV_RB16(x)  ((((const uint8_t*)(x))[0] << 8) | \
  68                       ((const uint8_t*)(x))[1])
  69 #endif
  70 #ifndef AV_WB16
  71 #define AV_WB16(p, d) do { \
  72                     ((uint8_t*)(p))[1] = (d); \
  73                     ((uint8_t*)(p))[0] = (d)>>8; } while(0)
  74 #endif
  75
  76 #ifndef AV_RL16
  77 #define AV_RL16(x)  ((((const uint8_t*)(x))[1] << 8) | \
  78                       ((const uint8_t*)(x))[0])
  79 #endif
  80 #ifndef AV_WL16
  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 #ifndef AV_RB32
  87 #define AV_RB32(x)  ((((const uint8_t*)(x))[0] << 24) | \
  88                      (((const uint8_t*)(x))[1] << 16) | \
  89                      (((const uint8_t*)(x))[2] <<  8) | \
  90                       ((const uint8_t*)(x))[3])
  91 #endif
  92 #ifndef AV_WB32
  93 #define AV_WB32(p, d) do { \
  94                     ((uint8_t*)(p))[3] = (d); \
  95                     ((uint8_t*)(p))[2] = (d)>>8; \
  96                     ((uint8_t*)(p))[1] = (d)>>16; \
  97                     ((uint8_t*)(p))[0] = (d)>>24; } while(0)
  98 #endif
  99
 100 #ifndef AV_RL32
 101 #define AV_RL32(x) ((((const uint8_t*)(x))[3] << 24) | \
 102                     (((const uint8_t*)(x))[2] << 16) | \
 103                     (((const uint8_t*)(x))[1] <<  8) | \
 104                      ((const uint8_t*)(x))[0])
 105 #endif
 106 #ifndef AV_WL32
 107 #define AV_WL32(p, d) do { \
 108                     ((uint8_t*)(p))[0] = (d); \
 109                     ((uint8_t*)(p))[1] = (d)>>8; \
 110                     ((uint8_t*)(p))[2] = (d)>>16; \
 111                     ((uint8_t*)(p))[3] = (d)>>24; } while(0)
 112 #endif
 113
 114 #ifndef AV_RB64
 115 #define AV_RB64(x)  (((uint64_t)((const uint8_t*)(x))[0] << 56) | \
 116                      ((uint64_t)((const uint8_t*)(x))[1] << 48) | \
 117                      ((uint64_t)((const uint8_t*)(x))[2] << 40) | \
 118                      ((uint64_t)((const uint8_t*)(x))[3] << 32) | \
 119                      ((uint64_t)((const uint8_t*)(x))[4] << 24) | \
 120                      ((uint64_t)((const uint8_t*)(x))[5] << 16) | \
 121                      ((uint64_t)((const uint8_t*)(x))[6] <<  8) | \
 122                       (uint64_t)((const uint8_t*)(x))[7])
 123 #endif
 124 #ifndef AV_WB64
 125 #define AV_WB64(p, d) do { \
 126                     ((uint8_t*)(p))[7] = (d);     \
 127                     ((uint8_t*)(p))[6] = (d)>>8;  \
 128                     ((uint8_t*)(p))[5] = (d)>>16; \
 129                     ((uint8_t*)(p))[4] = (d)>>24; \
 130                     ((uint8_t*)(p))[3] = (d)>>32; \
 131                     ((uint8_t*)(p))[2] = (d)>>40; \
 132                     ((uint8_t*)(p))[1] = (d)>>48; \
 133                     ((uint8_t*)(p))[0] = (d)>>56; } while(0)
 134 #endif
 135
 136 #ifndef AV_RL64
 137 #define AV_RL64(x)  (((uint64_t)((const uint8_t*)(x))[7] << 56) | \
 138                      ((uint64_t)((const uint8_t*)(x))[6] << 48) | \
 139                      ((uint64_t)((const uint8_t*)(x))[5] << 40) | \
 140                      ((uint64_t)((const uint8_t*)(x))[4] << 32) | \
 141                      ((uint64_t)((const uint8_t*)(x))[3] << 24) | \
 142                      ((uint64_t)((const uint8_t*)(x))[2] << 16) | \
 143                      ((uint64_t)((const uint8_t*)(x))[1] <<  8) | \
 144                       (uint64_t)((const uint8_t*)(x))[0])
 145 #endif
 146 #ifndef AV_WL64
 147 #define AV_WL64(p, d) do { \
 148                     ((uint8_t*)(p))[0] = (d);     \
 149                     ((uint8_t*)(p))[1] = (d)>>8;  \
 150                     ((uint8_t*)(p))[2] = (d)>>16; \
 151                     ((uint8_t*)(p))[3] = (d)>>24; \
 152                     ((uint8_t*)(p))[4] = (d)>>32; \
 153                     ((uint8_t*)(p))[5] = (d)>>40; \
 154                     ((uint8_t*)(p))[6] = (d)>>48; \
 155                     ((uint8_t*)(p))[7] = (d)>>56; } while(0)
 156 #endif
 157
 158 #ifdef WORDS_BIGENDIAN
 159 #   define AV_RN(s, p)    AV_RB##s(p)
 160 #   define AV_WN(s, p, v) AV_WB##s(p, v)
 161 #else
 162 #   define AV_RN(s, p)    AV_RL##s(p)
 163 #   define AV_WN(s, p, v) AV_WL##s(p, v)
 164 #endif
 165
 166 #endif /* HAVE_FAST_UNALIGNED */
 167
 168 #ifndef AV_RN16
 169 #   define AV_RN16(p) AV_RN(16, p)
 170 #endif
 171
 172 #ifndef AV_RN32
 173 #   define AV_RN32(p) AV_RN(32, p)
 174 #endif
 175
 176 #ifndef AV_RN64
 177 #   define AV_RN64(p) AV_RN(64, p)
 178 #endif
 179
 180 #ifndef AV_WN16
 181 #   define AV_WN16(p, v) AV_WN(16, p, v)
 182 #endif
 183
 184 #ifndef AV_WN32
 185 #   define AV_WN32(p, v) AV_WN(32, p, v)
 186 #endif
 187
 188 #ifndef AV_WN64
 189 #   define AV_WN64(p, v) AV_WN(64, p, v)
 190 #endif
 191
 192 #ifdef WORDS_BIGENDIAN
 193 #   define AV_RB(s, p)    AV_RN(s, p)
 194 #   define AV_WB(s, p, v) AV_WN(s, p, v)
 195 #   define AV_RL(s, p)    bswap_##s(AV_RN(s, p))
 196 #   define AV_WL(s, p, v) AV_WN(s, p, bswap_##s(v))
 197 #else
 198 #   define AV_RB(s, p)    bswap_##s(AV_RN(s, p))
 199 #   define AV_WB(s, p, v) AV_WN(s, p, bswap_##s(v))
 200 #   define AV_RL(s, p)    AV_RN(s, p)
 201 #   define AV_WL(s, p, v) AV_WN(s, p, v)
 202 #endif
 203
 204 #define AV_RB8(x)     (((const uint8_t*)(x))[0])
 205 #define AV_WB8(p, d)  do { ((uint8_t*)(p))[0] = (d); } while(0)
 206
 207 #define AV_RL8(x)     AV_RB8(x)
 208 #define AV_WL8(p, d)  AV_WB8(p, d)
 209
 210 #ifndef AV_RB16
 211 #   define AV_RB16(p)    AV_RB(16, p)
 212 #endif
 213 #ifndef AV_WB16
 214 #   define AV_WB16(p, v) AV_WB(16, p, v)
 215 #endif
 216
 217 #ifndef AV_RL16
 218 #   define AV_RL16(p)    AV_RL(16, p)
 219 #endif
 220 #ifndef AV_WL16
 221 #   define AV_WL16(p, v) AV_WL(16, p, v)
 222 #endif
 223
 224 #ifndef AV_RB32
 225 #   define AV_RB32(p)    AV_RB(32, p)
 226 #endif
 227 #ifndef AV_WB32
 228 #   define AV_WB32(p, v) AV_WB(32, p, v)
 229 #endif
 230
 231 #ifndef AV_RL32
 232 #   define AV_RL32(p)    AV_RL(32, p)
 233 #endif
 234 #ifndef AV_WL32
 235 #   define AV_WL32(p, v) AV_WL(32, p, v)
 236 #endif
 237
 238 #ifndef AV_RB64
 239 #   define AV_RB64(p)    AV_RB(64, p)
 240 #endif
 241 #ifndef AV_WB64
 242 #   define AV_WB64(p, v) AV_WB(64, p, v)
 243 #endif
 244
 245 #ifndef AV_RL64
 246 #   define AV_RL64(p)    AV_RL(64, p)
 247 #endif
 248 #ifndef AV_WL64
 249 #   define AV_WL64(p, v) AV_WL(64, p, v)
 250 #endif
 251
 252 #define AV_RB24(x)  ((((const uint8_t*)(x))[0] << 16) | \
 253                      (((const uint8_t*)(x))[1] <<  8) | \
 254                       ((const uint8_t*)(x))[2])
 255 #define AV_WB24(p, d) do { \
 256                     ((uint8_t*)(p))[2] = (d); \
 257                     ((uint8_t*)(p))[1] = (d)>>8; \
 258                     ((uint8_t*)(p))[0] = (d)>>16; } while(0)
 259
 260 #define AV_RL24(x)  ((((const uint8_t*)(x))[2] << 16) | \
 261                      (((const uint8_t*)(x))[1] <<  8) | \
 262                       ((const uint8_t*)(x))[0])
 263 #define AV_WL24(p, d) do { \
 264                     ((uint8_t*)(p))[0] = (d); \
 265                     ((uint8_t*)(p))[1] = (d)>>8; \
 266                     ((uint8_t*)(p))[2] = (d)>>16; } while(0)
 267
 268 #endif /* AVUTIL_INTREADWRITE_H */