| 1 | /* Copyright (C) 2010-2020 The RetroArch team |
| 2 | * |
| 3 | * --------------------------------------------------------------------------------------- |
| 4 | * The following license statement only applies to this file (chd_stream.c). |
| 5 | * --------------------------------------------------------------------------------------- |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, |
| 8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), |
| 9 | * to deal in the Software without restriction, including without limitation the rights to |
| 10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
| 16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #include <stdio.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <string.h> |
| 26 | |
| 27 | #include <boolean.h> |
| 28 | |
| 29 | #include <streams/chd_stream.h> |
| 30 | #include <retro_endianness.h> |
| 31 | #include <libchdr/chd.h> |
| 32 | #include <string/stdstring.h> |
| 33 | |
| 34 | #define SECTOR_SIZE 2352 |
| 35 | #define SUBCODE_SIZE 96 |
| 36 | #define TRACK_PAD 4 |
| 37 | |
| 38 | struct chdstream |
| 39 | { |
| 40 | chd_file *chd; |
| 41 | /* Loaded hunk */ |
| 42 | uint8_t *hunkmem; |
| 43 | /* Byte offset where track data starts (after pregap) */ |
| 44 | size_t track_start; |
| 45 | /* Byte offset where track data ends */ |
| 46 | size_t track_end; |
| 47 | /* Byte offset of read cursor */ |
| 48 | size_t offset; |
| 49 | /* Loaded hunk number */ |
| 50 | int32_t hunknum; |
| 51 | /* Size of frame taken from each hunk */ |
| 52 | uint32_t frame_size; |
| 53 | /* Offset of data within frame */ |
| 54 | uint32_t frame_offset; |
| 55 | /* Number of frames per hunk */ |
| 56 | uint32_t frames_per_hunk; |
| 57 | /* First frame of track in chd */ |
| 58 | uint32_t track_frame; |
| 59 | /* Should we swap bytes? */ |
| 60 | bool swab; |
| 61 | }; |
| 62 | |
| 63 | typedef struct metadata |
| 64 | { |
| 65 | uint32_t frame_offset; |
| 66 | uint32_t frames; |
| 67 | uint32_t pad; |
| 68 | uint32_t extra; |
| 69 | uint32_t pregap; |
| 70 | uint32_t postgap; |
| 71 | uint32_t track; |
| 72 | char type[64]; |
| 73 | char subtype[32]; |
| 74 | char pgtype[32]; |
| 75 | char pgsub[32]; |
| 76 | } metadata_t; |
| 77 | |
| 78 | static uint32_t padding_frames(uint32_t frames) |
| 79 | { |
| 80 | return ((frames + TRACK_PAD - 1) & ~(TRACK_PAD - 1)) - frames; |
| 81 | } |
| 82 | |
| 83 | static bool |
| 84 | chdstream_get_meta(chd_file *chd, int idx, metadata_t *md) |
| 85 | { |
| 86 | char meta[256]; |
| 87 | uint32_t meta_size = 0; |
| 88 | chd_error err; |
| 89 | |
| 90 | meta[0] = '\0'; |
| 91 | |
| 92 | memset(md, 0, sizeof(*md)); |
| 93 | |
| 94 | err = chd_get_metadata(chd, CDROM_TRACK_METADATA2_TAG, idx, meta, |
| 95 | sizeof(meta), &meta_size, NULL, NULL); |
| 96 | |
| 97 | if (err == CHDERR_NONE) |
| 98 | { |
| 99 | sscanf(meta, CDROM_TRACK_METADATA2_FORMAT, |
| 100 | &md->track, md->type, |
| 101 | md->subtype, &md->frames, &md->pregap, |
| 102 | md->pgtype, md->pgsub, |
| 103 | &md->postgap); |
| 104 | md->extra = padding_frames(md->frames); |
| 105 | return true; |
| 106 | } |
| 107 | |
| 108 | err = chd_get_metadata(chd, CDROM_TRACK_METADATA_TAG, idx, meta, |
| 109 | sizeof(meta), &meta_size, NULL, NULL); |
| 110 | |
| 111 | if (err == CHDERR_NONE) |
| 112 | { |
| 113 | sscanf(meta, CDROM_TRACK_METADATA_FORMAT, &md->track, md->type, |
| 114 | md->subtype, &md->frames); |
| 115 | md->extra = padding_frames(md->frames); |
| 116 | return true; |
| 117 | } |
| 118 | |
| 119 | err = chd_get_metadata(chd, GDROM_TRACK_METADATA_TAG, idx, meta, |
| 120 | sizeof(meta), &meta_size, NULL, NULL); |
| 121 | |
| 122 | if (err == CHDERR_NONE) |
| 123 | { |
| 124 | sscanf(meta, GDROM_TRACK_METADATA_FORMAT, &md->track, md->type, |
| 125 | md->subtype, &md->frames, &md->pad, &md->pregap, md->pgtype, |
| 126 | md->pgsub, &md->postgap); |
| 127 | md->extra = padding_frames(md->frames); |
| 128 | return true; |
| 129 | } |
| 130 | |
| 131 | return false; |
| 132 | } |
| 133 | |
| 134 | static bool |
| 135 | chdstream_find_track_number(chd_file *fd, int32_t track, metadata_t *meta) |
| 136 | { |
| 137 | uint32_t i; |
| 138 | uint32_t frame_offset = 0; |
| 139 | |
| 140 | for (i = 0; true; ++i) |
| 141 | { |
| 142 | if (!chdstream_get_meta(fd, i, meta)) |
| 143 | return false; |
| 144 | |
| 145 | if (track == (int)meta->track) |
| 146 | { |
| 147 | meta->frame_offset = frame_offset; |
| 148 | return true; |
| 149 | } |
| 150 | |
| 151 | frame_offset += meta->frames + meta->extra; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | static bool |
| 156 | chdstream_find_special_track(chd_file *fd, int32_t track, metadata_t *meta) |
| 157 | { |
| 158 | int32_t i; |
| 159 | metadata_t iter; |
| 160 | int32_t largest_track = 0; |
| 161 | uint32_t largest_size = 0; |
| 162 | |
| 163 | for (i = 1; true; ++i) |
| 164 | { |
| 165 | if (!chdstream_find_track_number(fd, i, &iter)) |
| 166 | { |
| 167 | if (track == CHDSTREAM_TRACK_LAST && i > 1) |
| 168 | return chdstream_find_track_number(fd, i - 1, meta); |
| 169 | |
| 170 | if (track == CHDSTREAM_TRACK_PRIMARY && largest_track != 0) |
| 171 | return chdstream_find_track_number(fd, largest_track, meta); |
| 172 | |
| 173 | return false; |
| 174 | } |
| 175 | |
| 176 | switch (track) |
| 177 | { |
| 178 | case CHDSTREAM_TRACK_FIRST_DATA: |
| 179 | if (strcmp(iter.type, "AUDIO")) |
| 180 | { |
| 181 | *meta = iter; |
| 182 | return true; |
| 183 | } |
| 184 | break; |
| 185 | case CHDSTREAM_TRACK_PRIMARY: |
| 186 | if (strcmp(iter.type, "AUDIO") && iter.frames > largest_size) |
| 187 | { |
| 188 | largest_size = iter.frames; |
| 189 | largest_track = iter.track; |
| 190 | } |
| 191 | break; |
| 192 | default: |
| 193 | break; |
| 194 | } |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | static bool |
| 199 | chdstream_find_track(chd_file *fd, int32_t track, metadata_t *meta) |
| 200 | { |
| 201 | if (track < 0) |
| 202 | return chdstream_find_special_track(fd, track, meta); |
| 203 | return chdstream_find_track_number(fd, track, meta); |
| 204 | } |
| 205 | |
| 206 | chdstream_t *chdstream_open(const char *path, int32_t track) |
| 207 | { |
| 208 | metadata_t meta; |
| 209 | uint32_t pregap = 0; |
| 210 | uint8_t *hunkmem = NULL; |
| 211 | const chd_header *hd = NULL; |
| 212 | chdstream_t *stream = NULL; |
| 213 | chd_file *chd = NULL; |
| 214 | chd_error err = chd_open(path, CHD_OPEN_READ, NULL, &chd); |
| 215 | |
| 216 | if (err != CHDERR_NONE) |
| 217 | return NULL; |
| 218 | |
| 219 | if (!chdstream_find_track(chd, track, &meta)) |
| 220 | goto error; |
| 221 | |
| 222 | stream = (chdstream_t*)malloc(sizeof(*stream)); |
| 223 | if (!stream) |
| 224 | goto error; |
| 225 | |
| 226 | stream->chd = NULL; |
| 227 | stream->swab = false; |
| 228 | stream->frame_size = 0; |
| 229 | stream->frame_offset = 0; |
| 230 | stream->frames_per_hunk = 0; |
| 231 | stream->track_frame = 0; |
| 232 | stream->track_start = 0; |
| 233 | stream->track_end = 0; |
| 234 | stream->offset = 0; |
| 235 | stream->hunkmem = NULL; |
| 236 | stream->hunknum = -1; |
| 237 | |
| 238 | hd = chd_get_header(chd); |
| 239 | hunkmem = (uint8_t*)malloc(hd->hunkbytes); |
| 240 | if (!hunkmem) |
| 241 | goto error; |
| 242 | |
| 243 | stream->hunkmem = hunkmem; |
| 244 | |
| 245 | if (string_is_equal(meta.type, "MODE1_RAW")) |
| 246 | stream->frame_size = SECTOR_SIZE; |
| 247 | else if (string_is_equal(meta.type, "MODE2_RAW")) |
| 248 | stream->frame_size = SECTOR_SIZE; |
| 249 | else if (string_is_equal(meta.type, "AUDIO")) |
| 250 | { |
| 251 | stream->frame_size = SECTOR_SIZE; |
| 252 | stream->swab = true; |
| 253 | } |
| 254 | else |
| 255 | stream->frame_size = hd->unitbytes; |
| 256 | |
| 257 | /* Only include pregap data if it was in the track file */ |
| 258 | if (meta.pgtype[0] != 'V') |
| 259 | pregap = meta.pregap; |
| 260 | |
| 261 | stream->chd = chd; |
| 262 | stream->frames_per_hunk = hd->hunkbytes / hd->unitbytes; |
| 263 | stream->track_frame = meta.frame_offset; |
| 264 | stream->track_start = (size_t)pregap * stream->frame_size; |
| 265 | stream->track_end = stream->track_start + |
| 266 | (size_t)meta.frames * stream->frame_size; |
| 267 | |
| 268 | return stream; |
| 269 | |
| 270 | error: |
| 271 | |
| 272 | chdstream_close(stream); |
| 273 | |
| 274 | if (chd) |
| 275 | chd_close(chd); |
| 276 | |
| 277 | return NULL; |
| 278 | } |
| 279 | |
| 280 | void chdstream_close(chdstream_t *stream) |
| 281 | { |
| 282 | if (!stream) |
| 283 | return; |
| 284 | |
| 285 | if (stream->hunkmem) |
| 286 | free(stream->hunkmem); |
| 287 | if (stream->chd) |
| 288 | chd_close(stream->chd); |
| 289 | free(stream); |
| 290 | } |
| 291 | |
| 292 | static bool |
| 293 | chdstream_load_hunk(chdstream_t *stream, uint32_t hunknum) |
| 294 | { |
| 295 | uint16_t *array; |
| 296 | |
| 297 | if ((int)hunknum == stream->hunknum) |
| 298 | return true; |
| 299 | |
| 300 | if (chd_read(stream->chd, hunknum, stream->hunkmem) != CHDERR_NONE) |
| 301 | return false; |
| 302 | |
| 303 | if (stream->swab) |
| 304 | { |
| 305 | uint32_t i; |
| 306 | uint32_t count = chd_get_header(stream->chd)->hunkbytes / 2; |
| 307 | array = (uint16_t*)stream->hunkmem; |
| 308 | for (i = 0; i < count; ++i) |
| 309 | array[i] = SWAP16(array[i]); |
| 310 | } |
| 311 | |
| 312 | stream->hunknum = hunknum; |
| 313 | return true; |
| 314 | } |
| 315 | |
| 316 | ssize_t chdstream_read(chdstream_t *stream, void *data, size_t bytes) |
| 317 | { |
| 318 | size_t end; |
| 319 | size_t data_offset = 0; |
| 320 | const chd_header *hd = chd_get_header(stream->chd); |
| 321 | uint8_t *out = (uint8_t*)data; |
| 322 | |
| 323 | if (stream->track_end - stream->offset < bytes) |
| 324 | bytes = stream->track_end - stream->offset; |
| 325 | |
| 326 | end = stream->offset + bytes; |
| 327 | |
| 328 | while (stream->offset < end) |
| 329 | { |
| 330 | uint32_t frame_offset = stream->offset % stream->frame_size; |
| 331 | uint32_t amount = stream->frame_size - frame_offset; |
| 332 | |
| 333 | if (amount > end - stream->offset) |
| 334 | amount = (uint32_t)(end - stream->offset); |
| 335 | |
| 336 | /* In pregap */ |
| 337 | if (stream->offset < stream->track_start) |
| 338 | memset(out + data_offset, 0, amount); |
| 339 | else |
| 340 | { |
| 341 | uint32_t chd_frame = (uint32_t)(stream->track_frame + |
| 342 | (stream->offset - stream->track_start) / stream->frame_size); |
| 343 | uint32_t hunk = chd_frame / stream->frames_per_hunk; |
| 344 | uint32_t hunk_offset = (chd_frame % stream->frames_per_hunk) |
| 345 | * hd->unitbytes; |
| 346 | |
| 347 | if (!chdstream_load_hunk(stream, hunk)) |
| 348 | return -1; |
| 349 | |
| 350 | memcpy(out + data_offset, |
| 351 | stream->hunkmem + frame_offset |
| 352 | + hunk_offset + stream->frame_offset, amount); |
| 353 | } |
| 354 | |
| 355 | data_offset += amount; |
| 356 | stream->offset += amount; |
| 357 | } |
| 358 | |
| 359 | return bytes; |
| 360 | } |
| 361 | |
| 362 | int chdstream_getc(chdstream_t *stream) |
| 363 | { |
| 364 | char c = 0; |
| 365 | |
| 366 | if (chdstream_read(stream, &c, sizeof(c) != sizeof(c))) |
| 367 | return EOF; |
| 368 | |
| 369 | return c; |
| 370 | } |
| 371 | |
| 372 | char *chdstream_gets(chdstream_t *stream, char *buffer, size_t len) |
| 373 | { |
| 374 | int c; |
| 375 | |
| 376 | size_t offset = 0; |
| 377 | |
| 378 | while (offset < len && (c = chdstream_getc(stream)) != EOF) |
| 379 | buffer[offset++] = c; |
| 380 | |
| 381 | if (offset < len) |
| 382 | buffer[offset] = '\0'; |
| 383 | |
| 384 | return buffer; |
| 385 | } |
| 386 | |
| 387 | uint64_t chdstream_tell(chdstream_t *stream) |
| 388 | { |
| 389 | return stream->offset; |
| 390 | } |
| 391 | |
| 392 | void chdstream_rewind(chdstream_t *stream) |
| 393 | { |
| 394 | stream->offset = 0; |
| 395 | } |
| 396 | |
| 397 | int64_t chdstream_seek(chdstream_t *stream, int64_t offset, int whence) |
| 398 | { |
| 399 | int64_t new_offset; |
| 400 | |
| 401 | switch (whence) |
| 402 | { |
| 403 | case SEEK_SET: |
| 404 | new_offset = offset; |
| 405 | break; |
| 406 | case SEEK_CUR: |
| 407 | new_offset = stream->offset + offset; |
| 408 | break; |
| 409 | case SEEK_END: |
| 410 | new_offset = stream->track_end + offset; |
| 411 | break; |
| 412 | default: |
| 413 | return -1; |
| 414 | } |
| 415 | |
| 416 | if (new_offset < 0) |
| 417 | return -1; |
| 418 | |
| 419 | if ((size_t)new_offset > stream->track_end) |
| 420 | new_offset = stream->track_end; |
| 421 | |
| 422 | stream->offset = new_offset; |
| 423 | return 0; |
| 424 | } |
| 425 | |
| 426 | ssize_t chdstream_get_size(chdstream_t *stream) |
| 427 | { |
| 428 | return stream->track_end - stream->track_start; |
| 429 | } |
| 430 | |
| 431 | uint32_t chdstream_get_track_start(chdstream_t *stream) |
| 432 | { |
| 433 | uint32_t i; |
| 434 | metadata_t meta; |
| 435 | uint32_t frame_offset = 0; |
| 436 | |
| 437 | for (i = 0; chdstream_get_meta(stream->chd, i, &meta); ++i) |
| 438 | { |
| 439 | if (stream->track_frame == frame_offset) |
| 440 | return meta.pregap * stream->frame_size; |
| 441 | |
| 442 | frame_offset += meta.frames + meta.extra; |
| 443 | } |
| 444 | |
| 445 | return 0; |
| 446 | } |
| 447 | |
| 448 | uint32_t chdstream_get_frame_size(chdstream_t *stream) |
| 449 | { |
| 450 | return stream->frame_size; |
| 451 | } |
| 452 | |
| 453 | uint32_t chdstream_get_first_track_sector(chdstream_t* stream) |
| 454 | { |
| 455 | uint32_t i; |
| 456 | metadata_t meta; |
| 457 | uint32_t frame_offset = 0; |
| 458 | uint32_t sector_offset = 0; |
| 459 | |
| 460 | for (i = 0; chdstream_get_meta(stream->chd, i, &meta); ++i) |
| 461 | { |
| 462 | if (stream->track_frame == frame_offset) |
| 463 | return sector_offset; |
| 464 | |
| 465 | sector_offset += meta.frames; |
| 466 | frame_offset += meta.frames + meta.extra; |
| 467 | } |
| 468 | |
| 469 | return 0; |
| 470 | } |