1 /* libFLAC - Free Lossless Audio Codec library 2 * Copyright (C) 2001-2009 Josh Coalson 3 * Copyright (C) 2011-2016 Xiph.Org Foundation 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * - Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * - Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * - Neither the name of the Xiph.org Foundation nor the names of its 17 * contributors may be used to endorse or promote products derived from 18 * this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifdef HAVE_CONFIG_H 34 # include <config.h> 35 #endif 36 37 #include <errno.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <stdarg.h> 42 43 #include <sys/stat.h> /* for stat(), maybe chmod() */ 44 45 #include "private/metadata.h" 46 47 #include "FLAC/assert.h" 48 #include "FLAC/stream_decoder.h" 49 #include "share/alloc.h" 50 #include "share/compat.h" 51 #include "share/macros.h" 52 #include "share/safe_str.h" 53 #include "private/macros.h" 54 #include "private/memory.h" 55 56 /* Alias the first (in share/alloc.h) to the second (in src/libFLAC/memory.c). */ 57 #define safe_malloc_mul_2op_ safe_malloc_mul_2op_p 58 59 /**************************************************************************** 60 * 61 * Local function declarations 62 * 63 ***************************************************************************/ 64 65 static void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes); 66 static void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes); 67 static void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes); 68 static FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes); 69 static FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes); 70 static FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes); 71 72 static FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator); 73 static FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block); 74 static FLAC__bool read_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__bool *is_last, FLAC__MetadataType *type, unsigned *length); 75 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata *block); 76 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block); 77 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_Padding *block, unsigned block_length); 78 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, unsigned block_length); 79 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, unsigned block_length); 80 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment_Entry *entry, unsigned max_length); 81 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_VorbisComment *block, unsigned block_length); 82 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track); 83 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block); 84 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Picture *block); 85 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, unsigned block_length); 86 87 static FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block); 88 static FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block); 89 static FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block); 90 static FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block); 91 static FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block); 92 static FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, unsigned block_length); 93 static FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, unsigned block_length); 94 static FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block); 95 static FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block); 96 static FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block); 97 static FLAC__bool write_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Picture *block); 98 static FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, unsigned block_length); 99 100 static FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block); 101 static FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last); 102 static FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append); 103 104 static void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator); 105 static FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator); 106 107 static unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb); 108 static unsigned seek_to_first_metadata_block_(FILE *f); 109 110 static FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append); 111 static FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, FLAC__off_t fixup_is_last_flag_offset, FLAC__bool backup); 112 113 static FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status); 114 static FLAC__bool copy_n_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status); 115 static FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status); 116 static FLAC__bool copy_remaining_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Eof eof_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__Metadata_SimpleIteratorStatus *status); 117 118 static FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status); 119 static FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status); 120 static void cleanup_tempfile_(FILE **tempfile, char **tempfilename); 121 122 static FLAC__bool get_file_stats_(const char *filename, struct flac_stat_s *stats); 123 static void set_file_stats_(const char *filename, struct flac_stat_s *stats); 124 125 static int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence); 126 static FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle); 127 128 static FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status); 129 130 131 #ifdef FLAC__VALGRIND_TESTING 132 static size_t local__fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream) 133 { 134 size_t ret = fwrite(ptr, size, nmemb, stream); 135 if(!ferror(stream)) 136 fflush(stream); 137 return ret; 138 } 139 #else 140 #define local__fwrite fwrite 141 #endif 142 143 /**************************************************************************** 144 * 145 * Level 0 implementation 146 * 147 ***************************************************************************/ 148 149 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data); 150 static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data); 151 static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); 152 153 typedef struct { 154 FLAC__bool got_error; 155 FLAC__StreamMetadata *object; 156 } level0_client_data; 157 158 static FLAC__StreamMetadata *get_one_metadata_block_(const char *filename, FLAC__MetadataType type) 159 { 160 level0_client_data cd; 161 FLAC__StreamDecoder *decoder; 162 163 FLAC__ASSERT(0 != filename); 164 165 cd.got_error = false; 166 cd.object = 0; 167 168 decoder = FLAC__stream_decoder_new(); 169 170 if(0 == decoder) 171 return 0; 172 173 FLAC__stream_decoder_set_md5_checking(decoder, false); 174 FLAC__stream_decoder_set_metadata_ignore_all(decoder); 175 FLAC__stream_decoder_set_metadata_respond(decoder, type); 176 177 if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, metadata_callback_, error_callback_, &cd) != FLAC__STREAM_DECODER_INIT_STATUS_OK || cd.got_error) { 178 (void)FLAC__stream_decoder_finish(decoder); 179 FLAC__stream_decoder_delete(decoder); 180 return 0; 181 } 182 183 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder) || cd.got_error) { 184 (void)FLAC__stream_decoder_finish(decoder); 185 FLAC__stream_decoder_delete(decoder); 186 if(0 != cd.object) 187 FLAC__metadata_object_delete(cd.object); 188 return 0; 189 } 190 191 (void)FLAC__stream_decoder_finish(decoder); 192 FLAC__stream_decoder_delete(decoder); 193 194 return cd.object; 195 } 196 197 FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo) 198 { 199 FLAC__StreamMetadata *object; 200 201 FLAC__ASSERT(0 != filename); 202 FLAC__ASSERT(0 != streaminfo); 203 204 object = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_STREAMINFO); 205 206 if (object) { 207 /* can just copy the contents since STREAMINFO has no internal structure */ 208 *streaminfo = *object; 209 FLAC__metadata_object_delete(object); 210 return true; 211 } 212 else { 213 return false; 214 } 215 } 216 217 FLAC_API FLAC__bool FLAC__metadata_get_tags(const char *filename, FLAC__StreamMetadata **tags) 218 { 219 FLAC__ASSERT(0 != filename); 220 FLAC__ASSERT(0 != tags); 221 222 *tags = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_VORBIS_COMMENT); 223 224 return 0 != *tags; 225 } 226 227 FLAC_API FLAC__bool FLAC__metadata_get_cuesheet(const char *filename, FLAC__StreamMetadata **cuesheet) 228 { 229 FLAC__ASSERT(0 != filename); 230 FLAC__ASSERT(0 != cuesheet); 231 232 *cuesheet = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_CUESHEET); 233 234 return 0 != *cuesheet; 235 } 236 237 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data) 238 { 239 (void)decoder, (void)frame, (void)buffer, (void)client_data; 240 241 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; 242 } 243 244 void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data) 245 { 246 level0_client_data *cd = (level0_client_data *)client_data; 247 (void)decoder; 248 249 /* 250 * we assume we only get here when the one metadata block we were 251 * looking for was passed to us 252 */ 253 if(!cd->got_error && 0 == cd->object) { 254 if(0 == (cd->object = FLAC__metadata_object_clone(metadata))) 255 cd->got_error = true; 256 } 257 } 258 259 void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) 260 { 261 level0_client_data *cd = (level0_client_data *)client_data; 262 (void)decoder; 263 264 if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC) 265 cd->got_error = true; 266 } 267 268 FLAC_API FLAC__bool FLAC__metadata_get_picture(const char *filename, FLAC__StreamMetadata **picture, FLAC__StreamMetadata_Picture_Type type, const char *mime_type, const FLAC__byte *description, unsigned max_width, unsigned max_height, unsigned max_depth, unsigned max_colors) 269 { 270 FLAC__Metadata_SimpleIterator *it; 271 FLAC__uint64 max_area_seen = 0; 272 FLAC__uint64 max_depth_seen = 0; 273 274 FLAC__ASSERT(0 != filename); 275 FLAC__ASSERT(0 != picture); 276 277 *picture = 0; 278 279 it = FLAC__metadata_simple_iterator_new(); 280 if(0 == it) 281 return false; 282 if(!FLAC__metadata_simple_iterator_init(it, filename, /*read_only=*/true, /*preserve_file_stats=*/true)) { 283 FLAC__metadata_simple_iterator_delete(it); 284 return false; 285 } 286 do { 287 if(FLAC__metadata_simple_iterator_get_block_type(it) == FLAC__METADATA_TYPE_PICTURE) { 288 FLAC__StreamMetadata *obj = FLAC__metadata_simple_iterator_get_block(it); 289 FLAC__uint64 area = (FLAC__uint64)obj->data.picture.width * (FLAC__uint64)obj->data.picture.height; 290 /* check constraints */ 291 if( 292 (type == (FLAC__StreamMetadata_Picture_Type)(-1) || type == obj->data.picture.type) && 293 (mime_type == 0 || !strcmp(mime_type, obj->data.picture.mime_type)) && 294 (description == 0 || !strcmp((const char *)description, (const char *)obj->data.picture.description)) && 295 obj->data.picture.width <= max_width && 296 obj->data.picture.height <= max_height && 297 obj->data.picture.depth <= max_depth && 298 obj->data.picture.colors <= max_colors && 299 (area > max_area_seen || (area == max_area_seen && obj->data.picture.depth > max_depth_seen)) 300 ) { 301 if(*picture) 302 FLAC__metadata_object_delete(*picture); 303 *picture = obj; 304 max_area_seen = area; 305 max_depth_seen = obj->data.picture.depth; 306 } 307 else { 308 FLAC__metadata_object_delete(obj); 309 } 310 } 311 } while(FLAC__metadata_simple_iterator_next(it)); 312 313 FLAC__metadata_simple_iterator_delete(it); 314 315 return (0 != *picture); 316 } 317 318 319 /**************************************************************************** 320 * 321 * Level 1 implementation 322 * 323 ***************************************************************************/ 324 325 #define SIMPLE_ITERATOR_MAX_PUSH_DEPTH (1+4) 326 /* 1 for initial offset, +4 for our own personal use */ 327 328 struct FLAC__Metadata_SimpleIterator { 329 FILE *file; 330 char *filename, *tempfile_path_prefix; 331 struct flac_stat_s stats; 332 FLAC__bool has_stats; 333 FLAC__bool is_writable; 334 FLAC__Metadata_SimpleIteratorStatus status; 335 FLAC__off_t offset[SIMPLE_ITERATOR_MAX_PUSH_DEPTH]; 336 FLAC__off_t first_offset; /* this is the offset to the STREAMINFO block */ 337 unsigned depth; 338 /* this is the metadata block header of the current block we are pointing to: */ 339 FLAC__bool is_last; 340 FLAC__MetadataType type; 341 unsigned length; 342 }; 343 344 FLAC_API const char * const FLAC__Metadata_SimpleIteratorStatusString[] = { 345 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK", 346 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT", 347 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE", 348 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE", 349 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE", 350 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA", 351 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR", 352 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR", 353 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR", 354 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR", 355 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR", 356 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR", 357 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR" 358 }; 359 360 361 FLAC_API FLAC__Metadata_SimpleIterator *FLAC__metadata_simple_iterator_new(void) 362 { 363 FLAC__Metadata_SimpleIterator *iterator = calloc(1, sizeof(FLAC__Metadata_SimpleIterator)); 364 365 if(0 != iterator) { 366 iterator->file = 0; 367 iterator->filename = 0; 368 iterator->tempfile_path_prefix = 0; 369 iterator->has_stats = false; 370 iterator->is_writable = false; 371 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; 372 iterator->first_offset = iterator->offset[0] = -1; 373 iterator->depth = 0; 374 } 375 376 return iterator; 377 } 378 379 static void simple_iterator_free_guts_(FLAC__Metadata_SimpleIterator *iterator) 380 { 381 FLAC__ASSERT(0 != iterator); 382 383 if(0 != iterator->file) { 384 fclose(iterator->file); 385 iterator->file = 0; 386 if(iterator->has_stats) 387 set_file_stats_(iterator->filename, &iterator->stats); 388 } 389 if(0 != iterator->filename) { 390 free(iterator->filename); 391 iterator->filename = 0; 392 } 393 if(0 != iterator->tempfile_path_prefix) { 394 free(iterator->tempfile_path_prefix); 395 iterator->tempfile_path_prefix = 0; 396 } 397 } 398 399 FLAC_API void FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator *iterator) 400 { 401 FLAC__ASSERT(0 != iterator); 402 403 simple_iterator_free_guts_(iterator); 404 free(iterator); 405 } 406 407 FLAC_API FLAC__Metadata_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator *iterator) 408 { 409 FLAC__Metadata_SimpleIteratorStatus status; 410 411 FLAC__ASSERT(0 != iterator); 412 413 status = iterator->status; 414 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; 415 return status; 416 } 417 418 static FLAC__bool simple_iterator_prime_input_(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool read_only) 419 { 420 unsigned ret; 421 422 FLAC__ASSERT(0 != iterator); 423 424 if(read_only || 0 == (iterator->file = flac_fopen(iterator->filename, "r+b"))) { 425 iterator->is_writable = false; 426 if(read_only || errno == EACCES) { 427 if(0 == (iterator->file = flac_fopen(iterator->filename, "rb"))) { 428 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE; 429 return false; 430 } 431 } 432 else { 433 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE; 434 return false; 435 } 436 } 437 else { 438 iterator->is_writable = true; 439 } 440 441 ret = seek_to_first_metadata_block_(iterator->file); 442 switch(ret) { 443 case 0: 444 iterator->depth = 0; 445 iterator->first_offset = iterator->offset[iterator->depth] = ftello(iterator->file); 446 return read_metadata_block_header_(iterator); 447 case 1: 448 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 449 return false; 450 case 2: 451 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 452 return false; 453 case 3: 454 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE; 455 return false; 456 default: 457 FLAC__ASSERT(0); 458 return false; 459 } 460 } 461 462 #if 0 463 @@@ If we decide to finish implementing this, put this comment back in metadata.h 464 /* 465 * The 'tempfile_path_prefix' allows you to specify a directory where 466 * tempfiles should go. Remember that if your metadata edits cause the 467 * FLAC file to grow, the entire file will have to be rewritten. If 468 * 'tempfile_path_prefix' is NULL, the temp file will be written in the 469 * same directory as the original FLAC file. This makes replacing the 470 * original with the tempfile fast but requires extra space in the same 471 * partition for the tempfile. If space is a problem, you can pass a 472 * directory name belonging to a different partition in 473 * 'tempfile_path_prefix'. Note that you should use the forward slash 474 * '/' as the directory separator. A trailing slash is not needed; it 475 * will be added automatically. 476 */ 477 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats, const char *tempfile_path_prefix); 478 #endif 479 480 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool read_only, FLAC__bool preserve_file_stats) 481 { 482 const char *tempfile_path_prefix = 0; /*@@@ search for comments near 'flac_rename(...)' for what it will take to finish implementing this */ 483 484 FLAC__ASSERT(0 != iterator); 485 FLAC__ASSERT(0 != filename); 486 487 simple_iterator_free_guts_(iterator); 488 489 if(!read_only && preserve_file_stats) 490 iterator->has_stats = get_file_stats_(filename, &iterator->stats); 491 492 if(0 == (iterator->filename = strdup(filename))) { 493 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 494 return false; 495 } 496 if(0 != tempfile_path_prefix && 0 == (iterator->tempfile_path_prefix = strdup(tempfile_path_prefix))) { 497 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 498 return false; 499 } 500 501 return simple_iterator_prime_input_(iterator, read_only); 502 } 503 504 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator *iterator) 505 { 506 FLAC__ASSERT(0 != iterator); 507 FLAC__ASSERT(0 != iterator->file); 508 509 return iterator->is_writable; 510 } 511 512 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator *iterator) 513 { 514 FLAC__ASSERT(0 != iterator); 515 FLAC__ASSERT(0 != iterator->file); 516 517 if(iterator->is_last) 518 return false; 519 520 if(0 != fseeko(iterator->file, iterator->length, SEEK_CUR)) { 521 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 522 return false; 523 } 524 525 iterator->offset[iterator->depth] = ftello(iterator->file); 526 527 return read_metadata_block_header_(iterator); 528 } 529 530 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator *iterator) 531 { 532 FLAC__off_t this_offset; 533 534 FLAC__ASSERT(0 != iterator); 535 FLAC__ASSERT(0 != iterator->file); 536 537 if(iterator->offset[iterator->depth] == iterator->first_offset) 538 return false; 539 540 if(0 != fseeko(iterator->file, iterator->first_offset, SEEK_SET)) { 541 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 542 return false; 543 } 544 this_offset = iterator->first_offset; 545 if(!read_metadata_block_header_(iterator)) 546 return false; 547 548 /* we ignore any error from ftello() and catch it in fseeko() */ 549 while(ftello(iterator->file) + (FLAC__off_t)iterator->length < iterator->offset[iterator->depth]) { 550 if(0 != fseeko(iterator->file, iterator->length, SEEK_CUR)) { 551 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 552 return false; 553 } 554 this_offset = ftello(iterator->file); 555 if(!read_metadata_block_header_(iterator)) 556 return false; 557 } 558 559 iterator->offset[iterator->depth] = this_offset; 560 561 return true; 562 } 563 564 /*@@@@add to tests*/ 565 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_last(const FLAC__Metadata_SimpleIterator *iterator) 566 { 567 FLAC__ASSERT(0 != iterator); 568 FLAC__ASSERT(0 != iterator->file); 569 570 return iterator->is_last; 571 } 572 573 /*@@@@add to tests*/ 574 FLAC_API off_t FLAC__metadata_simple_iterator_get_block_offset(const FLAC__Metadata_SimpleIterator *iterator) 575 { 576 FLAC__ASSERT(0 != iterator); 577 FLAC__ASSERT(0 != iterator->file); 578 579 return iterator->offset[iterator->depth]; 580 } 581 582 FLAC_API FLAC__MetadataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator *iterator) 583 { 584 FLAC__ASSERT(0 != iterator); 585 FLAC__ASSERT(0 != iterator->file); 586 587 return iterator->type; 588 } 589 590 /*@@@@add to tests*/ 591 FLAC_API unsigned FLAC__metadata_simple_iterator_get_block_length(const FLAC__Metadata_SimpleIterator *iterator) 592 { 593 FLAC__ASSERT(0 != iterator); 594 FLAC__ASSERT(0 != iterator->file); 595 596 return iterator->length; 597 } 598 599 /*@@@@add to tests*/ 600 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_get_application_id(FLAC__Metadata_SimpleIterator *iterator, FLAC__byte *id) 601 { 602 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8; 603 604 FLAC__ASSERT(0 != iterator); 605 FLAC__ASSERT(0 != iterator->file); 606 FLAC__ASSERT(0 != id); 607 608 if(iterator->type != FLAC__METADATA_TYPE_APPLICATION) { 609 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT; 610 return false; 611 } 612 613 if(fread(id, 1, id_bytes, iterator->file) != id_bytes) { 614 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 615 return false; 616 } 617 618 /* back up */ 619 if(0 != fseeko(iterator->file, -((int)id_bytes), SEEK_CUR)) { 620 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 621 return false; 622 } 623 624 return true; 625 } 626 627 FLAC_API FLAC__StreamMetadata *FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator *iterator) 628 { 629 FLAC__StreamMetadata *block = FLAC__metadata_object_new(iterator->type); 630 631 FLAC__ASSERT(0 != iterator); 632 FLAC__ASSERT(0 != iterator->file); 633 634 if(0 != block) { 635 block->is_last = iterator->is_last; 636 block->length = iterator->length; 637 638 if(!read_metadata_block_data_(iterator, block)) { 639 FLAC__metadata_object_delete(block); 640 return 0; 641 } 642 643 /* back up to the beginning of the block data to stay consistent */ 644 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH, SEEK_SET)) { 645 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 646 FLAC__metadata_object_delete(block); 647 return 0; 648 } 649 } 650 else 651 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 652 653 return block; 654 } 655 656 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding) 657 { 658 FLAC__ASSERT_DECLARATION(FLAC__off_t debug_target_offset = iterator->offset[iterator->depth];) 659 FLAC__bool ret; 660 661 FLAC__ASSERT(0 != iterator); 662 FLAC__ASSERT(0 != iterator->file); 663 FLAC__ASSERT(0 != block); 664 665 if(!iterator->is_writable) { 666 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE; 667 return false; 668 } 669 670 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO || block->type == FLAC__METADATA_TYPE_STREAMINFO) { 671 if(iterator->type != block->type) { 672 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT; 673 return false; 674 } 675 } 676 677 block->is_last = iterator->is_last; 678 679 if(iterator->length == block->length) 680 return write_metadata_block_stationary_(iterator, block); 681 else if(iterator->length > block->length) { 682 if(use_padding && iterator->length >= FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) { 683 ret = write_metadata_block_stationary_with_padding_(iterator, block, iterator->length - FLAC__STREAM_METADATA_HEADER_LENGTH - block->length, block->is_last); 684 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset); 685 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); 686 return ret; 687 } 688 else { 689 ret = rewrite_whole_file_(iterator, block, /*append=*/false); 690 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset); 691 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); 692 return ret; 693 } 694 } 695 else /* iterator->length < block->length */ { 696 unsigned padding_leftover = 0; 697 FLAC__bool padding_is_last = false; 698 if(use_padding) { 699 /* first see if we can even use padding */ 700 if(iterator->is_last) { 701 use_padding = false; 702 } 703 else { 704 const unsigned extra_padding_bytes_required = block->length - iterator->length; 705 simple_iterator_push_(iterator); 706 if(!FLAC__metadata_simple_iterator_next(iterator)) { 707 (void)simple_iterator_pop_(iterator); 708 return false; 709 } 710 if(iterator->type != FLAC__METADATA_TYPE_PADDING) { 711 use_padding = false; 712 } 713 else { 714 if(FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length == extra_padding_bytes_required) { 715 padding_leftover = 0; 716 block->is_last = iterator->is_last; 717 } 718 else if(iterator->length < extra_padding_bytes_required) 719 use_padding = false; 720 else { 721 padding_leftover = FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length - extra_padding_bytes_required; 722 padding_is_last = iterator->is_last; 723 block->is_last = false; 724 } 725 } 726 if(!simple_iterator_pop_(iterator)) 727 return false; 728 } 729 } 730 if(use_padding) { 731 if(padding_leftover == 0) { 732 ret = write_metadata_block_stationary_(iterator, block); 733 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset); 734 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); 735 return ret; 736 } 737 else { 738 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH); 739 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last); 740 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset); 741 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); 742 return ret; 743 } 744 } 745 else { 746 ret = rewrite_whole_file_(iterator, block, /*append=*/false); 747 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset); 748 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); 749 return ret; 750 } 751 } 752 } 753 754 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding) 755 { 756 unsigned padding_leftover = 0; 757 FLAC__bool padding_is_last = false; 758 759 FLAC__ASSERT_DECLARATION(FLAC__off_t debug_target_offset = iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length;) 760 FLAC__bool ret; 761 762 FLAC__ASSERT(0 != iterator); 763 FLAC__ASSERT(0 != iterator->file); 764 FLAC__ASSERT(0 != block); 765 766 if(!iterator->is_writable) { 767 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE; 768 return false; 769 } 770 771 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) { 772 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT; 773 return false; 774 } 775 776 block->is_last = iterator->is_last; 777 778 if(use_padding) { 779 /* first see if we can even use padding */ 780 if(iterator->is_last) { 781 use_padding = false; 782 } 783 else { 784 simple_iterator_push_(iterator); 785 if(!FLAC__metadata_simple_iterator_next(iterator)) { 786 (void)simple_iterator_pop_(iterator); 787 return false; 788 } 789 if(iterator->type != FLAC__METADATA_TYPE_PADDING) { 790 use_padding = false; 791 } 792 else { 793 if(iterator->length == block->length) { 794 padding_leftover = 0; 795 block->is_last = iterator->is_last; 796 } 797 else if(iterator->length < FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) 798 use_padding = false; 799 else { 800 padding_leftover = iterator->length - block->length; 801 padding_is_last = iterator->is_last; 802 block->is_last = false; 803 } 804 } 805 if(!simple_iterator_pop_(iterator)) 806 return false; 807 } 808 } 809 if(use_padding) { 810 /* move to the next block, which is suitable padding */ 811 if(!FLAC__metadata_simple_iterator_next(iterator)) 812 return false; 813 if(padding_leftover == 0) { 814 ret = write_metadata_block_stationary_(iterator, block); 815 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset); 816 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); 817 return ret; 818 } 819 else { 820 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH); 821 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last); 822 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset); 823 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); 824 return ret; 825 } 826 } 827 else { 828 ret = rewrite_whole_file_(iterator, block, /*append=*/true); 829 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset); 830 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); 831 return ret; 832 } 833 } 834 835 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool use_padding) 836 { 837 FLAC__ASSERT_DECLARATION(FLAC__off_t debug_target_offset = iterator->offset[iterator->depth];) 838 FLAC__bool ret; 839 840 if(!iterator->is_writable) { 841 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE; 842 return false; 843 } 844 845 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO) { 846 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT; 847 return false; 848 } 849 850 if(use_padding) { 851 FLAC__StreamMetadata *padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING); 852 if(0 == padding) { 853 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 854 return false; 855 } 856 padding->length = iterator->length; 857 if(!FLAC__metadata_simple_iterator_set_block(iterator, padding, false)) { 858 FLAC__metadata_object_delete(padding); 859 return false; 860 } 861 FLAC__metadata_object_delete(padding); 862 if(!FLAC__metadata_simple_iterator_prev(iterator)) 863 return false; 864 FLAC__ASSERT(iterator->offset[iterator->depth] + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length == debug_target_offset); 865 FLAC__ASSERT(ftello(iterator->file) + (FLAC__off_t)iterator->length == debug_target_offset); 866 return true; 867 } 868 else { 869 ret = rewrite_whole_file_(iterator, 0, /*append=*/false); 870 FLAC__ASSERT(iterator->offset[iterator->depth] + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length == debug_target_offset); 871 FLAC__ASSERT(ftello(iterator->file) + (FLAC__off_t)iterator->length == debug_target_offset); 872 return ret; 873 } 874 } 875 876 877 878 /**************************************************************************** 879 * 880 * Level 2 implementation 881 * 882 ***************************************************************************/ 883 884 885 typedef struct FLAC__Metadata_Node { 886 FLAC__StreamMetadata *data; 887 struct FLAC__Metadata_Node *prev, *next; 888 } FLAC__Metadata_Node; 889 890 struct FLAC__Metadata_Chain { 891 char *filename; /* will be NULL if using callbacks */ 892 FLAC__bool is_ogg; 893 FLAC__Metadata_Node *head; 894 FLAC__Metadata_Node *tail; 895 unsigned nodes; 896 FLAC__Metadata_ChainStatus status; 897 FLAC__off_t first_offset, last_offset; 898 /* 899 * This is the length of the chain initially read from the FLAC file. 900 * it is used to compare against the current length to decide whether 901 * or not the whole file has to be rewritten. 902 */ 903 FLAC__off_t initial_length; 904 /* @@@ hacky, these are currently only needed by ogg reader */ 905 FLAC__IOHandle handle; 906 FLAC__IOCallback_Read read_cb; 907 }; 908 909 struct FLAC__Metadata_Iterator { 910 FLAC__Metadata_Chain *chain; 911 FLAC__Metadata_Node *current; 912 }; 913 914 FLAC_API const char * const FLAC__Metadata_ChainStatusString[] = { 915 "FLAC__METADATA_CHAIN_STATUS_OK", 916 "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT", 917 "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE", 918 "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE", 919 "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE", 920 "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA", 921 "FLAC__METADATA_CHAIN_STATUS_READ_ERROR", 922 "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR", 923 "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR", 924 "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR", 925 "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR", 926 "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR", 927 "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR", 928 "FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS", 929 "FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH", 930 "FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL" 931 }; 932 933 934 static FLAC__Metadata_Node *node_new_(void) 935 { 936 return calloc(1, sizeof(FLAC__Metadata_Node)); 937 } 938 939 static void node_delete_(FLAC__Metadata_Node *node) 940 { 941 FLAC__ASSERT(0 != node); 942 if(0 != node->data) 943 FLAC__metadata_object_delete(node->data); 944 free(node); 945 } 946 947 static void chain_init_(FLAC__Metadata_Chain *chain) 948 { 949 FLAC__ASSERT(0 != chain); 950 951 chain->filename = 0; 952 chain->is_ogg = false; 953 chain->head = chain->tail = 0; 954 chain->nodes = 0; 955 chain->status = FLAC__METADATA_CHAIN_STATUS_OK; 956 chain->initial_length = 0; 957 chain->read_cb = 0; 958 } 959 960 static void chain_clear_(FLAC__Metadata_Chain *chain) 961 { 962 FLAC__Metadata_Node *node, *next; 963 964 FLAC__ASSERT(0 != chain); 965 966 for(node = chain->head; node; ) { 967 next = node->next; 968 node_delete_(node); 969 node = next; 970 } 971 972 if(0 != chain->filename) 973 free(chain->filename); 974 975 chain_init_(chain); 976 } 977 978 static void chain_append_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node) 979 { 980 FLAC__ASSERT(0 != chain); 981 FLAC__ASSERT(0 != node); 982 FLAC__ASSERT(0 != node->data); 983 984 node->next = node->prev = 0; 985 node->data->is_last = true; 986 if(0 != chain->tail) 987 chain->tail->data->is_last = false; 988 989 if(0 == chain->head) 990 chain->head = node; 991 else { 992 FLAC__ASSERT(0 != chain->tail); 993 chain->tail->next = node; 994 node->prev = chain->tail; 995 } 996 chain->tail = node; 997 chain->nodes++; 998 } 999 1000 static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node) 1001 { 1002 FLAC__ASSERT(0 != chain); 1003 FLAC__ASSERT(0 != node); 1004 1005 if(node == chain->head) 1006 chain->head = node->next; 1007 else 1008 node->prev->next = node->next; 1009 1010 if(node == chain->tail) 1011 chain->tail = node->prev; 1012 else 1013 node->next->prev = node->prev; 1014 1015 if(0 != chain->tail) 1016 chain->tail->data->is_last = true; 1017 1018 chain->nodes--; 1019 } 1020 1021 static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node) 1022 { 1023 chain_remove_node_(chain, node); 1024 node_delete_(node); 1025 } 1026 1027 static FLAC__off_t chain_calculate_length_(FLAC__Metadata_Chain *chain) 1028 { 1029 const FLAC__Metadata_Node *node; 1030 FLAC__off_t length = 0; 1031 for(node = chain->head; node; node = node->next) 1032 length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length); 1033 return length; 1034 } 1035 1036 static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node) 1037 { 1038 FLAC__ASSERT(0 != node); 1039 FLAC__ASSERT(0 != node->data); 1040 FLAC__ASSERT(0 != iterator); 1041 FLAC__ASSERT(0 != iterator->current); 1042 FLAC__ASSERT(0 != iterator->chain); 1043 FLAC__ASSERT(0 != iterator->chain->head); 1044 FLAC__ASSERT(0 != iterator->chain->tail); 1045 1046 node->data->is_last = false; 1047 1048 node->prev = iterator->current->prev; 1049 node->next = iterator->current; 1050 1051 if(0 == node->prev) 1052 iterator->chain->head = node; 1053 else 1054 node->prev->next = node; 1055 1056 iterator->current->prev = node; 1057 1058 iterator->chain->nodes++; 1059 } 1060 1061 static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node) 1062 { 1063 FLAC__ASSERT(0 != node); 1064 FLAC__ASSERT(0 != node->data); 1065 FLAC__ASSERT(0 != iterator); 1066 FLAC__ASSERT(0 != iterator->current); 1067 FLAC__ASSERT(0 != iterator->chain); 1068 FLAC__ASSERT(0 != iterator->chain->head); 1069 FLAC__ASSERT(0 != iterator->chain->tail); 1070 1071 iterator->current->data->is_last = false; 1072 1073 node->prev = iterator->current; 1074 node->next = iterator->current->next; 1075 1076 if(0 == node->next) 1077 iterator->chain->tail = node; 1078 else 1079 node->next->prev = node; 1080 1081 node->prev->next = node; 1082 1083 iterator->chain->tail->data->is_last = true; 1084 1085 iterator->chain->nodes++; 1086 } 1087 1088 /* return true iff node and node->next are both padding */ 1089 static FLAC__bool chain_merge_adjacent_padding_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node) 1090 { 1091 if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) { 1092 const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length; 1093 node->data->length += growth; /* new block size can be greater than max metadata block size, but it'll be fixed later in chain_prepare_for_write_() */ 1094 1095 chain_delete_node_(chain, node->next); 1096 return true; 1097 } 1098 else 1099 return false; 1100 } 1101 1102 /* Returns the new length of the chain, or 0 if there was an error. */ 1103 /* WATCHOUT: This can get called multiple times before a write, so 1104 * it should still work when this happens. 1105 */ 1106 /* WATCHOUT: Make sure to also update the logic in 1107 * FLAC__metadata_chain_check_if_tempfile_needed() if the logic here changes. 1108 */ 1109 static FLAC__off_t chain_prepare_for_write_(FLAC__Metadata_Chain *chain, FLAC__bool use_padding) 1110 { 1111 FLAC__off_t current_length = chain_calculate_length_(chain); 1112 1113 if(use_padding) { 1114 /* if the metadata shrank and the last block is padding, we just extend the last padding block */ 1115 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) { 1116 const FLAC__off_t delta = chain->initial_length - current_length; 1117 chain->tail->data->length += delta; 1118 current_length += delta; 1119 FLAC__ASSERT(current_length == chain->initial_length); 1120 } 1121 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */ 1122 else if(current_length + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) { 1123 FLAC__StreamMetadata *padding; 1124 FLAC__Metadata_Node *node; 1125 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) { 1126 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; 1127 return 0; 1128 } 1129 padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + current_length); 1130 if(0 == (node = node_new_())) { 1131 FLAC__metadata_object_delete(padding); 1132 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; 1133 return 0; 1134 } 1135 node->data = padding; 1136 chain_append_node_(chain, node); 1137 current_length = chain_calculate_length_(chain); 1138 FLAC__ASSERT(current_length == chain->initial_length); 1139 } 1140 /* if the metadata grew but the last block is padding, try cutting the padding to restore the original length so we don't have to rewrite the whole file */ 1141 else if(current_length > chain->initial_length) { 1142 const FLAC__off_t delta = current_length - chain->initial_length; 1143 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) { 1144 /* if the delta is exactly the size of the last padding block, remove the padding block */ 1145 if((FLAC__off_t)chain->tail->data->length + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH == delta) { 1146 chain_delete_node_(chain, chain->tail); 1147 current_length = chain_calculate_length_(chain); 1148 FLAC__ASSERT(current_length == chain->initial_length); 1149 } 1150 /* if there is at least 'delta' bytes of padding, trim the padding down */ 1151 else if((FLAC__off_t)chain->tail->data->length >= delta) { 1152 chain->tail->data->length -= delta; 1153 current_length -= delta; 1154 FLAC__ASSERT(current_length == chain->initial_length); 1155 } 1156 } 1157 } 1158 } 1159 1160 /* check sizes of all metadata blocks; reduce padding size if necessary */ 1161 { 1162 FLAC__Metadata_Node *node; 1163 for (node = chain->head; node; node = node->next) { 1164 if(node->data->length >= (1u << FLAC__STREAM_METADATA_LENGTH_LEN)) { 1165 if(node->data->type == FLAC__METADATA_TYPE_PADDING) { 1166 node->data->length = (1u << FLAC__STREAM_METADATA_LENGTH_LEN) - 1; 1167 current_length = chain_calculate_length_(chain); 1168 } else { 1169 chain->status = FLAC__METADATA_CHAIN_STATUS_BAD_METADATA; 1170 return 0; 1171 } 1172 } 1173 } 1174 } 1175 1176 return current_length; 1177 } 1178 1179 static FLAC__bool chain_read_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__IOCallback_Tell tell_cb) 1180 { 1181 FLAC__Metadata_Node *node; 1182 1183 FLAC__ASSERT(0 != chain); 1184 1185 /* we assume we're already at the beginning of the file */ 1186 1187 switch(seek_to_first_metadata_block_cb_(handle, read_cb, seek_cb)) { 1188 case 0: 1189 break; 1190 case 1: 1191 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR; 1192 return false; 1193 case 2: 1194 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR; 1195 return false; 1196 case 3: 1197 chain->status = FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE; 1198 return false; 1199 default: 1200 FLAC__ASSERT(0); 1201 return false; 1202 } 1203 1204 { 1205 FLAC__int64 pos = tell_cb(handle); 1206 if(pos < 0) { 1207 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR; 1208 return false; 1209 } 1210 chain->first_offset = (FLAC__off_t)pos; 1211 } 1212 1213 { 1214 FLAC__bool is_last; 1215 FLAC__MetadataType type; 1216 unsigned length; 1217 1218 do { 1219 node = node_new_(); 1220 if(0 == node) { 1221 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; 1222 return false; 1223 } 1224 1225 if(!read_metadata_block_header_cb_(handle, read_cb, &is_last, &type, &length)) { 1226 node_delete_(node); 1227 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR; 1228 return false; 1229 } 1230 1231 node->data = FLAC__metadata_object_new(type); 1232 if(0 == node->data) { 1233 node_delete_(node); 1234 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; 1235 return false; 1236 } 1237 1238 node->data->is_last = is_last; 1239 node->data->length = length; 1240 1241 chain->status = get_equivalent_status_(read_metadata_block_data_cb_(handle, read_cb, seek_cb, node->data)); 1242 if(chain->status != FLAC__METADATA_CHAIN_STATUS_OK) { 1243 node_delete_(node); 1244 return false; 1245 } 1246 chain_append_node_(chain, node); 1247 } while(!is_last); 1248 } 1249 1250 { 1251 FLAC__int64 pos = tell_cb(handle); 1252 if(pos < 0) { 1253 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR; 1254 return false; 1255 } 1256 chain->last_offset = (FLAC__off_t)pos; 1257 } 1258 1259 chain->initial_length = chain_calculate_length_(chain); 1260 1261 return true; 1262 } 1263 1264 static FLAC__StreamDecoderReadStatus chain_read_ogg_read_cb_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data) 1265 { 1266 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data; 1267 (void)decoder; 1268 if(*bytes > 0 && chain->status == FLAC__METADATA_CHAIN_STATUS_OK) { 1269 *bytes = chain->read_cb(buffer, sizeof(FLAC__byte), *bytes, chain->handle); 1270 if(*bytes == 0) 1271 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM; 1272 else 1273 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; 1274 } 1275 else 1276 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; 1277 } 1278 1279 static FLAC__StreamDecoderWriteStatus chain_read_ogg_write_cb_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data) 1280 { 1281 (void)decoder, (void)frame, (void)buffer, (void)client_data; 1282 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; 1283 } 1284 1285 static void chain_read_ogg_metadata_cb_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data) 1286 { 1287 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data; 1288 FLAC__Metadata_Node *node; 1289 1290 (void)decoder; 1291 1292 node = node_new_(); 1293 if(0 == node) { 1294 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; 1295 return; 1296 } 1297 1298 node->data = FLAC__metadata_object_clone(metadata); 1299 if(0 == node->data) { 1300 node_delete_(node); 1301 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; 1302 return; 1303 } 1304 1305 chain_append_node_(chain, node); 1306 } 1307 1308 static void chain_read_ogg_error_cb_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) 1309 { 1310 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data; 1311 (void)decoder, (void)status; 1312 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */ 1313 } 1314 1315 static FLAC__bool chain_read_ogg_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb) 1316 { 1317 FLAC__StreamDecoder *decoder; 1318 1319 FLAC__ASSERT(0 != chain); 1320 1321 /* we assume we're already at the beginning of the file */ 1322 1323 chain->handle = handle; 1324 chain->read_cb = read_cb; 1325 if(0 == (decoder = FLAC__stream_decoder_new())) { 1326 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; 1327 return false; 1328 } 1329 FLAC__stream_decoder_set_metadata_respond_all(decoder); 1330 if(FLAC__stream_decoder_init_ogg_stream(decoder, chain_read_ogg_read_cb_, /*seek_callback=*/0, /*tell_callback=*/0, /*length_callback=*/0, /*eof_callback=*/0, chain_read_ogg_write_cb_, chain_read_ogg_metadata_cb_, chain_read_ogg_error_cb_, chain) != FLAC__STREAM_DECODER_INIT_STATUS_OK) { 1331 FLAC__stream_decoder_delete(decoder); 1332 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */ 1333 return false; 1334 } 1335 1336 chain->first_offset = 0; /*@@@ wrong; will need to be set correctly to implement metadata writing for Ogg FLAC */ 1337 1338 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) 1339 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */ 1340 if(chain->status != FLAC__METADATA_CHAIN_STATUS_OK) { 1341 FLAC__stream_decoder_delete(decoder); 1342 return false; 1343 } 1344 1345 FLAC__stream_decoder_delete(decoder); 1346 1347 chain->last_offset = 0; /*@@@ wrong; will need to be set correctly to implement metadata writing for Ogg FLAC */ 1348 1349 chain->initial_length = chain_calculate_length_(chain); 1350 1351 return true; 1352 } 1353 1354 static FLAC__bool chain_rewrite_metadata_in_place_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, FLAC__IOCallback_Seek seek_cb) 1355 { 1356 FLAC__Metadata_Node *node; 1357 1358 FLAC__ASSERT(0 != chain); 1359 FLAC__ASSERT(0 != chain->head); 1360 1361 if(0 != seek_cb(handle, chain->first_offset, SEEK_SET)) { 1362 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR; 1363 return false; 1364 } 1365 1366 for(node = chain->head; node; node = node->next) { 1367 if(!write_metadata_block_header_cb_(handle, write_cb, node->data)) { 1368 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR; 1369 return false; 1370 } 1371 if(!write_metadata_block_data_cb_(handle, write_cb, node->data)) { 1372 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR; 1373 return false; 1374 } 1375 } 1376 1377 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/ 1378 1379 chain->status = FLAC__METADATA_CHAIN_STATUS_OK; 1380 return true; 1381 } 1382 1383 static FLAC__bool chain_rewrite_metadata_in_place_(FLAC__Metadata_Chain *chain) 1384 { 1385 FILE *file; 1386 FLAC__bool ret; 1387 1388 FLAC__ASSERT(0 != chain->filename); 1389 1390 if(0 == (file = flac_fopen(chain->filename, "r+b"))) { 1391 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE; 1392 return false; 1393 } 1394 1395 /* chain_rewrite_metadata_in_place_cb_() sets chain->status for us */ 1396 ret = chain_rewrite_metadata_in_place_cb_(chain, (FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, fseek_wrapper_); 1397 1398 fclose(file); 1399 1400 return ret; 1401 } 1402 1403 static FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix) 1404 { 1405 FILE *f, *tempfile = NULL; 1406 char *tempfilename; 1407 FLAC__Metadata_SimpleIteratorStatus status; 1408 const FLAC__Metadata_Node *node; 1409 1410 FLAC__ASSERT(0 != chain); 1411 FLAC__ASSERT(0 != chain->filename); 1412 FLAC__ASSERT(0 != chain->head); 1413 1414 /* copy the file prefix (data up to first metadata block */ 1415 if(0 == (f = flac_fopen(chain->filename, "rb"))) { 1416 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE; 1417 return false; 1418 } 1419 if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) { 1420 chain->status = get_equivalent_status_(status); 1421 goto err; 1422 } 1423 if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) { 1424 chain->status = get_equivalent_status_(status); 1425 goto err; 1426 } 1427 1428 /* write the metadata */ 1429 for(node = chain->head; node; node = node->next) { 1430 if(!write_metadata_block_header_(tempfile, &status, node->data)) { 1431 chain->status = get_equivalent_status_(status); 1432 goto err; 1433 } 1434 if(!write_metadata_block_data_(tempfile, &status, node->data)) { 1435 chain->status = get_equivalent_status_(status); 1436 goto err; 1437 } 1438 } 1439 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/ 1440 1441 /* copy the file postfix (everything after the metadata) */ 1442 if(0 != fseeko(f, chain->last_offset, SEEK_SET)) { 1443 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR; 1444 goto err; 1445 } 1446 if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) { 1447 chain->status = get_equivalent_status_(status); 1448 goto err; 1449 } 1450 1451 /* move the tempfile on top of the original */ 1452 (void)fclose(f); 1453 if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status)) 1454 return false; 1455 1456 return true; 1457 1458 err: 1459 (void)fclose(f); 1460 cleanup_tempfile_(&tempfile, &tempfilename); 1461 return false; 1462 } 1463 1464 /* assumes 'handle' is already at beginning of file */ 1465 static FLAC__bool chain_rewrite_file_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__IOCallback_Eof eof_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb) 1466 { 1467 FLAC__Metadata_SimpleIteratorStatus status; 1468 const FLAC__Metadata_Node *node; 1469 1470 FLAC__ASSERT(0 != chain); 1471 FLAC__ASSERT(0 == chain->filename); 1472 FLAC__ASSERT(0 != chain->head); 1473 1474 /* copy the file prefix (data up to first metadata block */ 1475 if(!copy_n_bytes_from_file_cb_(handle, read_cb, temp_handle, temp_write_cb, chain->first_offset, &status)) { 1476 chain->status = get_equivalent_status_(status); 1477 return false; 1478 } 1479 1480 /* write the metadata */ 1481 for(node = chain->head; node; node = node->next) { 1482 if(!write_metadata_block_header_cb_(temp_handle, temp_write_cb, node->data)) { 1483 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR; 1484 return false; 1485 } 1486 if(!write_metadata_block_data_cb_(temp_handle, temp_write_cb, node->data)) { 1487 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR; 1488 return false; 1489 } 1490 } 1491 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/ 1492 1493 /* copy the file postfix (everything after the metadata) */ 1494 if(0 != seek_cb(handle, chain->last_offset, SEEK_SET)) { 1495 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR; 1496 return false; 1497 } 1498 if(!copy_remaining_bytes_from_file_cb_(handle, read_cb, eof_cb, temp_handle, temp_write_cb, &status)) { 1499 chain->status = get_equivalent_status_(status); 1500 return false; 1501 } 1502 1503 return true; 1504 } 1505 1506 FLAC_API FLAC__Metadata_Chain *FLAC__metadata_chain_new(void) 1507 { 1508 FLAC__Metadata_Chain *chain = calloc(1, sizeof(FLAC__Metadata_Chain)); 1509 1510 if(0 != chain) 1511 chain_init_(chain); 1512 1513 return chain; 1514 } 1515 1516 FLAC_API void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain) 1517 { 1518 FLAC__ASSERT(0 != chain); 1519 1520 chain_clear_(chain); 1521 1522 free(chain); 1523 } 1524 1525 FLAC_API FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain) 1526 { 1527 FLAC__Metadata_ChainStatus status; 1528 1529 FLAC__ASSERT(0 != chain); 1530 1531 status = chain->status; 1532 chain->status = FLAC__METADATA_CHAIN_STATUS_OK; 1533 return status; 1534 } 1535 1536 static FLAC__bool chain_read_(FLAC__Metadata_Chain *chain, const char *filename, FLAC__bool is_ogg) 1537 { 1538 FILE *file; 1539 FLAC__bool ret; 1540 1541 FLAC__ASSERT(0 != chain); 1542 FLAC__ASSERT(0 != filename); 1543 1544 chain_clear_(chain); 1545 1546 if(0 == (chain->filename = strdup(filename))) { 1547 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; 1548 return false; 1549 } 1550 1551 chain->is_ogg = is_ogg; 1552 1553 if(0 == (file = flac_fopen(filename, "rb"))) { 1554 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE; 1555 return false; 1556 } 1557 1558 /* the function also sets chain->status for us */ 1559 ret = is_ogg? 1560 chain_read_ogg_cb_(chain, file, (FLAC__IOCallback_Read)fread) : 1561 chain_read_cb_(chain, file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, ftell_wrapper_) 1562 ; 1563 1564 fclose(file); 1565 1566 return ret; 1567 } 1568 1569 FLAC_API FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename) 1570 { 1571 return chain_read_(chain, filename, /*is_ogg=*/false); 1572 } 1573 1574 /*@@@@add to tests*/ 1575 FLAC_API FLAC__bool FLAC__metadata_chain_read_ogg(FLAC__Metadata_Chain *chain, const char *filename) 1576 { 1577 return chain_read_(chain, filename, /*is_ogg=*/true); 1578 } 1579 1580 static FLAC__bool chain_read_with_callbacks_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks, FLAC__bool is_ogg) 1581 { 1582 FLAC__bool ret; 1583 1584 FLAC__ASSERT(0 != chain); 1585 1586 chain_clear_(chain); 1587 1588 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.tell) { 1589 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS; 1590 return false; 1591 } 1592 1593 chain->is_ogg = is_ogg; 1594 1595 /* rewind */ 1596 if(0 != callbacks.seek(handle, 0, SEEK_SET)) { 1597 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR; 1598 return false; 1599 } 1600 1601 /* the function also sets chain->status for us */ 1602 ret = is_ogg? 1603 chain_read_ogg_cb_(chain, handle, callbacks.read) : 1604 chain_read_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.tell) 1605 ; 1606 1607 return ret; 1608 } 1609 1610 FLAC_API FLAC__bool FLAC__metadata_chain_read_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks) 1611 { 1612 return chain_read_with_callbacks_(chain, handle, callbacks, /*is_ogg=*/false); 1613 } 1614 1615 /*@@@@add to tests*/ 1616 FLAC_API FLAC__bool FLAC__metadata_chain_read_ogg_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks) 1617 { 1618 return chain_read_with_callbacks_(chain, handle, callbacks, /*is_ogg=*/true); 1619 } 1620 1621 typedef enum { 1622 LBS_NONE = 0, 1623 LBS_SIZE_CHANGED, 1624 LBS_BLOCK_ADDED, 1625 LBS_BLOCK_REMOVED 1626 } LastBlockState; 1627 1628 FLAC_API FLAC__bool FLAC__metadata_chain_check_if_tempfile_needed(FLAC__Metadata_Chain *chain, FLAC__bool use_padding) 1629 { 1630 /* This does all the same checks that are in chain_prepare_for_write_() 1631 * but doesn't actually alter the chain. Make sure to update the logic 1632 * here if chain_prepare_for_write_() changes. 1633 */ 1634 FLAC__off_t current_length; 1635 LastBlockState lbs_state = LBS_NONE; 1636 unsigned lbs_size = 0; 1637 1638 FLAC__ASSERT(0 != chain); 1639 1640 current_length = chain_calculate_length_(chain); 1641 1642 if(use_padding) { 1643 const FLAC__Metadata_Node * const node = chain->tail; 1644 /* if the metadata shrank and the last block is padding, we just extend the last padding block */ 1645 if(current_length < chain->initial_length && node->data->type == FLAC__METADATA_TYPE_PADDING) { 1646 lbs_state = LBS_SIZE_CHANGED; 1647 lbs_size = node->data->length + (chain->initial_length - current_length); 1648 } 1649 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */ 1650 else if(current_length + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) { 1651 lbs_state = LBS_BLOCK_ADDED; 1652 lbs_size = chain->initial_length - (current_length + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH); 1653 } 1654 /* if the metadata grew but the last block is padding, try cutting the padding to restore the original length so we don't have to rewrite the whole file */ 1655 else if(current_length > chain->initial_length) { 1656 const FLAC__off_t delta = current_length - chain->initial_length; 1657 if(node->data->type == FLAC__METADATA_TYPE_PADDING) { 1658 /* if the delta is exactly the size of the last padding block, remove the padding block */ 1659 if((FLAC__off_t)node->data->length + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH == delta) { 1660 lbs_state = LBS_BLOCK_REMOVED; 1661 lbs_size = 0; 1662 } 1663 /* if there is at least 'delta' bytes of padding, trim the padding down */ 1664 else if((FLAC__off_t)node->data->length >= delta) { 1665 lbs_state = LBS_SIZE_CHANGED; 1666 lbs_size = node->data->length - delta; 1667 } 1668 } 1669 } 1670 } 1671 1672 current_length = 0; 1673 /* check sizes of all metadata blocks; reduce padding size if necessary */ 1674 { 1675 const FLAC__Metadata_Node *node; 1676 for(node = chain->head; node; node = node->next) { 1677 unsigned block_len = node->data->length; 1678 if(node == chain->tail) { 1679 if(lbs_state == LBS_BLOCK_REMOVED) 1680 continue; 1681 else if(lbs_state == LBS_SIZE_CHANGED) 1682 block_len = lbs_size; 1683 } 1684 if(block_len >= (1u << FLAC__STREAM_METADATA_LENGTH_LEN)) { 1685 if(node->data->type == FLAC__METADATA_TYPE_PADDING) 1686 block_len = (1u << FLAC__STREAM_METADATA_LENGTH_LEN) - 1; 1687 else 1688 return false /* the return value doesn't matter */; 1689 } 1690 current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + block_len); 1691 } 1692 1693 if(lbs_state == LBS_BLOCK_ADDED) { 1694 /* test added padding block */ 1695 unsigned block_len = lbs_size; 1696 if(block_len >= (1u << FLAC__STREAM_METADATA_LENGTH_LEN)) 1697 block_len = (1u << FLAC__STREAM_METADATA_LENGTH_LEN) - 1; 1698 current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + block_len); 1699 } 1700 } 1701 1702 return (current_length != chain->initial_length); 1703 } 1704 1705 FLAC_API FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats) 1706 { 1707 struct flac_stat_s stats; 1708 const char *tempfile_path_prefix = 0; 1709 FLAC__off_t current_length; 1710 1711 FLAC__ASSERT(0 != chain); 1712 1713 if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */ 1714 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; 1715 return false; 1716 } 1717 1718 if (0 == chain->filename) { 1719 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH; 1720 return false; 1721 } 1722 1723 current_length = chain_prepare_for_write_(chain, use_padding); 1724 1725 /* a return value of 0 means there was an error; chain->status is already set */ 1726 if (0 == current_length) 1727 return false; 1728 1729 if(preserve_file_stats) 1730 get_file_stats_(chain->filename, &stats); 1731 1732 if(current_length == chain->initial_length) { 1733 if(!chain_rewrite_metadata_in_place_(chain)) 1734 return false; 1735 } 1736 else { 1737 if(!chain_rewrite_file_(chain, tempfile_path_prefix)) 1738 return false; 1739 1740 /* recompute lengths and offsets */ 1741 { 1742 const FLAC__Metadata_Node *node; 1743 chain->initial_length = current_length; 1744 chain->last_offset = chain->first_offset; 1745 for(node = chain->head; node; node = node->next) 1746 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length); 1747 } 1748 } 1749 1750 if(preserve_file_stats) 1751 set_file_stats_(chain->filename, &stats); 1752 1753 return true; 1754 } 1755 1756 FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks) 1757 { 1758 FLAC__off_t current_length; 1759 1760 FLAC__ASSERT(0 != chain); 1761 1762 if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */ 1763 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; 1764 return false; 1765 } 1766 1767 if (0 != chain->filename) { 1768 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH; 1769 return false; 1770 } 1771 1772 if (0 == callbacks.write || 0 == callbacks.seek) { 1773 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS; 1774 return false; 1775 } 1776 1777 if (FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) { 1778 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL; 1779 return false; 1780 } 1781 1782 current_length = chain_prepare_for_write_(chain, use_padding); 1783 1784 /* a return value of 0 means there was an error; chain->status is already set */ 1785 if (0 == current_length) 1786 return false; 1787 1788 FLAC__ASSERT(current_length == chain->initial_length); 1789 1790 return chain_rewrite_metadata_in_place_cb_(chain, handle, callbacks.write, callbacks.seek); 1791 } 1792 1793 FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks_and_tempfile(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks, FLAC__IOHandle temp_handle, FLAC__IOCallbacks temp_callbacks) 1794 { 1795 FLAC__off_t current_length; 1796 1797 FLAC__ASSERT(0 != chain); 1798 1799 if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */ 1800 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; 1801 return false; 1802 } 1803 1804 if (0 != chain->filename) { 1805 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH; 1806 return false; 1807 } 1808 1809 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.eof) { 1810 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS; 1811 return false; 1812 } 1813 if (0 == temp_callbacks.write) { 1814 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS; 1815 return false; 1816 } 1817 1818 if (!FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) { 1819 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL; 1820 return false; 1821 } 1822 1823 current_length = chain_prepare_for_write_(chain, use_padding); 1824 1825 /* a return value of 0 means there was an error; chain->status is already set */ 1826 if (0 == current_length) 1827 return false; 1828 1829 FLAC__ASSERT(current_length != chain->initial_length); 1830 1831 /* rewind */ 1832 if(0 != callbacks.seek(handle, 0, SEEK_SET)) { 1833 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR; 1834 return false; 1835 } 1836 1837 if(!chain_rewrite_file_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.eof, temp_handle, temp_callbacks.write)) 1838 return false; 1839 1840 /* recompute lengths and offsets */ 1841 { 1842 const FLAC__Metadata_Node *node; 1843 chain->initial_length = current_length; 1844 chain->last_offset = chain->first_offset; 1845 for(node = chain->head; node; node = node->next) 1846 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length); 1847 } 1848 1849 return true; 1850 } 1851 1852 FLAC_API void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain) 1853 { 1854 FLAC__Metadata_Node *node; 1855 1856 FLAC__ASSERT(0 != chain); 1857 1858 for(node = chain->head; node; ) { 1859 if(!chain_merge_adjacent_padding_(chain, node)) 1860 node = node->next; 1861 } 1862 } 1863 1864 FLAC_API void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain) 1865 { 1866 FLAC__Metadata_Node *node, *save; 1867 unsigned i; 1868 1869 FLAC__ASSERT(0 != chain); 1870 1871 /* 1872 * Don't try and be too smart... this simple algo is good enough for 1873 * the small number of nodes that we deal with. 1874 */ 1875 for(i = 0, node = chain->head; i < chain->nodes; i++) { 1876 if(node->data->type == FLAC__METADATA_TYPE_PADDING) { 1877 save = node->next; 1878 chain_remove_node_(chain, node); 1879 chain_append_node_(chain, node); 1880 node = save; 1881 } 1882 else { 1883 node = node->next; 1884 } 1885 } 1886 1887 FLAC__metadata_chain_merge_padding(chain); 1888 } 1889 1890 1891 FLAC_API FLAC__Metadata_Iterator *FLAC__metadata_iterator_new(void) 1892 { 1893 FLAC__Metadata_Iterator *iterator = calloc(1, sizeof(FLAC__Metadata_Iterator)); 1894 1895 /* calloc() implies: 1896 iterator->current = 0; 1897 iterator->chain = 0; 1898 */ 1899 1900 return iterator; 1901 } 1902 1903 FLAC_API void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator) 1904 { 1905 FLAC__ASSERT(0 != iterator); 1906 1907 free(iterator); 1908 } 1909 1910 FLAC_API void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain) 1911 { 1912 FLAC__ASSERT(0 != iterator); 1913 FLAC__ASSERT(0 != chain); 1914 FLAC__ASSERT(0 != chain->head); 1915 1916 iterator->chain = chain; 1917 iterator->current = chain->head; 1918 } 1919 1920 FLAC_API FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator) 1921 { 1922 FLAC__ASSERT(0 != iterator); 1923 1924 if(0 == iterator->current || 0 == iterator->current->next) 1925 return false; 1926 1927 iterator->current = iterator->current->next; 1928 return true; 1929 } 1930 1931 FLAC_API FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator) 1932 { 1933 FLAC__ASSERT(0 != iterator); 1934 1935 if(0 == iterator->current || 0 == iterator->current->prev) 1936 return false; 1937 1938 iterator->current = iterator->current->prev; 1939 return true; 1940 } 1941 1942 FLAC_API FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator) 1943 { 1944 FLAC__ASSERT(0 != iterator); 1945 FLAC__ASSERT(0 != iterator->current); 1946 FLAC__ASSERT(0 != iterator->current->data); 1947 1948 return iterator->current->data->type; 1949 } 1950 1951 FLAC_API FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator) 1952 { 1953 FLAC__ASSERT(0 != iterator); 1954 FLAC__ASSERT(0 != iterator->current); 1955 1956 return iterator->current->data; 1957 } 1958 1959 FLAC_API FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block) 1960 { 1961 FLAC__ASSERT(0 != iterator); 1962 FLAC__ASSERT(0 != block); 1963 return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block); 1964 } 1965 1966 FLAC_API FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding) 1967 { 1968 FLAC__Metadata_Node *save; 1969 1970 FLAC__ASSERT(0 != iterator); 1971 FLAC__ASSERT(0 != iterator->current); 1972 1973 if(0 == iterator->current->prev) { 1974 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO); 1975 return false; 1976 } 1977 1978 save = iterator->current->prev; 1979 1980 if(replace_with_padding) { 1981 FLAC__metadata_object_delete_data(iterator->current->data); 1982 iterator->current->data->type = FLAC__METADATA_TYPE_PADDING; 1983 } 1984 else { 1985 chain_delete_node_(iterator->chain, iterator->current); 1986 } 1987 1988 iterator->current = save; 1989 return true; 1990 } 1991 1992 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block) 1993 { 1994 FLAC__Metadata_Node *node; 1995 1996 FLAC__ASSERT(0 != iterator); 1997 FLAC__ASSERT(0 != iterator->current); 1998 FLAC__ASSERT(0 != block); 1999 2000 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) 2001 return false; 2002 2003 if(0 == iterator->current->prev) { 2004 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO); 2005 return false; 2006 } 2007 2008 if(0 == (node = node_new_())) 2009 return false; 2010 2011 node->data = block; 2012 iterator_insert_node_(iterator, node); 2013 iterator->current = node; 2014 return true; 2015 } 2016 2017 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block) 2018 { 2019 FLAC__Metadata_Node *node; 2020 2021 FLAC__ASSERT(0 != iterator); 2022 FLAC__ASSERT(0 != iterator->current); 2023 FLAC__ASSERT(0 != block); 2024 2025 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) 2026 return false; 2027 2028 if(0 == (node = node_new_())) 2029 return false; 2030 2031 node->data = block; 2032 iterator_insert_node_after_(iterator, node); 2033 iterator->current = node; 2034 return true; 2035 } 2036 2037 2038 /**************************************************************************** 2039 * 2040 * Local function definitions 2041 * 2042 ***************************************************************************/ 2043 2044 void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes) 2045 { 2046 unsigned i; 2047 2048 b += bytes; 2049 2050 for(i = 0; i < bytes; i++) { 2051 *(--b) = (FLAC__byte)(val & 0xff); 2052 val >>= 8; 2053 } 2054 } 2055 2056 void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes) 2057 { 2058 unsigned i; 2059 2060 for(i = 0; i < bytes; i++) { 2061 *(b++) = (FLAC__byte)(val & 0xff); 2062 val >>= 8; 2063 } 2064 } 2065 2066 void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes) 2067 { 2068 unsigned i; 2069 2070 b += bytes; 2071 2072 for(i = 0; i < bytes; i++) { 2073 *(--b) = (FLAC__byte)(val & 0xff); 2074 val >>= 8; 2075 } 2076 } 2077 2078 FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes) 2079 { 2080 FLAC__uint32 ret = 0; 2081 unsigned i; 2082 2083 for(i = 0; i < bytes; i++) 2084 ret = (ret << 8) | (FLAC__uint32)(*b++); 2085 2086 return ret; 2087 } 2088 2089 FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes) 2090 { 2091 FLAC__uint32 ret = 0; 2092 unsigned i; 2093 2094 b += bytes; 2095 2096 for(i = 0; i < bytes; i++) 2097 ret = (ret << 8) | (FLAC__uint32)(*--b); 2098 2099 return ret; 2100 } 2101 2102 FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes) 2103 { 2104 FLAC__uint64 ret = 0; 2105 unsigned i; 2106 2107 for(i = 0; i < bytes; i++) 2108 ret = (ret << 8) | (FLAC__uint64)(*b++); 2109 2110 return ret; 2111 } 2112 2113 FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator) 2114 { 2115 FLAC__ASSERT(0 != iterator); 2116 FLAC__ASSERT(0 != iterator->file); 2117 2118 if(!read_metadata_block_header_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, &iterator->is_last, &iterator->type, &iterator->length)) { 2119 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2120 return false; 2121 } 2122 2123 return true; 2124 } 2125 2126 FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block) 2127 { 2128 FLAC__ASSERT(0 != iterator); 2129 FLAC__ASSERT(0 != iterator->file); 2130 2131 iterator->status = read_metadata_block_data_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, block); 2132 2133 return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK); 2134 } 2135 2136 FLAC__bool read_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__bool *is_last, FLAC__MetadataType *type, unsigned *length) 2137 { 2138 FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH]; 2139 2140 if(read_cb(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH) 2141 return false; 2142 2143 *is_last = raw_header[0] & 0x80? true : false; 2144 *type = (FLAC__MetadataType)(raw_header[0] & 0x7f); 2145 *length = unpack_uint32_(raw_header + 1, 3); 2146 2147 /* Note that we don't check: 2148 * if(iterator->type >= FLAC__METADATA_TYPE_UNDEFINED) 2149 * we just will read in an opaque block 2150 */ 2151 2152 return true; 2153 } 2154 2155 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata *block) 2156 { 2157 switch(block->type) { 2158 case FLAC__METADATA_TYPE_STREAMINFO: 2159 return read_metadata_block_data_streaminfo_cb_(handle, read_cb, &block->data.stream_info); 2160 case FLAC__METADATA_TYPE_PADDING: 2161 return read_metadata_block_data_padding_cb_(handle, seek_cb, &block->data.padding, block->length); 2162 case FLAC__METADATA_TYPE_APPLICATION: 2163 return read_metadata_block_data_application_cb_(handle, read_cb, &block->data.application, block->length); 2164 case FLAC__METADATA_TYPE_SEEKTABLE: 2165 return read_metadata_block_data_seektable_cb_(handle, read_cb, &block->data.seek_table, block->length); 2166 case FLAC__METADATA_TYPE_VORBIS_COMMENT: 2167 return read_metadata_block_data_vorbis_comment_cb_(handle, read_cb, seek_cb, &block->data.vorbis_comment, block->length); 2168 case FLAC__METADATA_TYPE_CUESHEET: 2169 return read_metadata_block_data_cuesheet_cb_(handle, read_cb, &block->data.cue_sheet); 2170 case FLAC__METADATA_TYPE_PICTURE: 2171 return read_metadata_block_data_picture_cb_(handle, read_cb, &block->data.picture); 2172 default: 2173 return read_metadata_block_data_unknown_cb_(handle, read_cb, &block->data.unknown, block->length); 2174 } 2175 } 2176 2177 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block) 2178 { 2179 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b; 2180 2181 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH) 2182 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2183 2184 b = buffer; 2185 2186 /* we are using hardcoded numbers for simplicity but we should 2187 * probably eventually write a bit-level unpacker and use the 2188 * _STREAMINFO_ constants. 2189 */ 2190 block->min_blocksize = unpack_uint32_(b, 2); b += 2; 2191 block->max_blocksize = unpack_uint32_(b, 2); b += 2; 2192 block->min_framesize = unpack_uint32_(b, 3); b += 3; 2193 block->max_framesize = unpack_uint32_(b, 3); b += 3; 2194 block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4); 2195 block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1; 2196 block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 4) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1; 2197 block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4); 2198 memcpy(block->md5sum, b+8, 16); 2199 2200 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; 2201 } 2202 2203 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_Padding *block, unsigned block_length) 2204 { 2205 (void)block; /* nothing to do; we don't care about reading the padding bytes */ 2206 2207 if(0 != seek_cb(handle, block_length, SEEK_CUR)) 2208 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 2209 2210 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; 2211 } 2212 2213 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, unsigned block_length) 2214 { 2215 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8; 2216 2217 if(read_cb(block->id, 1, id_bytes, handle) != id_bytes) 2218 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2219 2220 if(block_length < id_bytes) 2221 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2222 2223 block_length -= id_bytes; 2224 2225 if(block_length == 0) { 2226 block->data = 0; 2227 } 2228 else { 2229 if(0 == (block->data = malloc(block_length))) 2230 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 2231 2232 if(read_cb(block->data, 1, block_length, handle) != block_length) 2233 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2234 } 2235 2236 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; 2237 } 2238 2239 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, unsigned block_length) 2240 { 2241 unsigned i; 2242 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH]; 2243 2244 FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0); 2245 2246 block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH; 2247 2248 if(block->num_points == 0) 2249 block->points = 0; 2250 else if(0 == (block->points = safe_malloc_mul_2op_p(block->num_points, /*times*/sizeof(FLAC__StreamMetadata_SeekPoint)))) 2251 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 2252 2253 for(i = 0; i < block->num_points; i++) { 2254 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH) 2255 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2256 /* some MAGIC NUMBERs here */ 2257 block->points[i].sample_number = unpack_uint64_(buffer, 8); 2258 block->points[i].stream_offset = unpack_uint64_(buffer+8, 8); 2259 block->points[i].frame_samples = unpack_uint32_(buffer+16, 2); 2260 } 2261 2262 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; 2263 } 2264 2265 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment_Entry *entry, unsigned max_length) 2266 { 2267 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8; 2268 FLAC__byte buffer[4]; /* magic number is asserted below */ 2269 2270 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8 == sizeof(buffer)); 2271 2272 if(max_length < entry_length_len) 2273 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA; 2274 2275 max_length -= entry_length_len; 2276 if(read_cb(buffer, 1, entry_length_len, handle) != entry_length_len) 2277 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2278 entry->length = unpack_uint32_little_endian_(buffer, entry_length_len); 2279 if(max_length < entry->length) { 2280 entry->length = 0; 2281 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA; 2282 } else max_length -= entry->length; 2283 2284 if(0 != entry->entry) 2285 free(entry->entry); 2286 2287 if(entry->length == 0) { 2288 entry->entry = 0; 2289 } 2290 else { 2291 if(0 == (entry->entry = safe_malloc_add_2op_(entry->length, /*+*/1))) 2292 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 2293 2294 if(read_cb(entry->entry, 1, entry->length, handle) != entry->length) 2295 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2296 2297 entry->entry[entry->length] = '\0'; 2298 } 2299 2300 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; 2301 } 2302 2303 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_VorbisComment *block, unsigned block_length) 2304 { 2305 unsigned i; 2306 FLAC__Metadata_SimpleIteratorStatus status; 2307 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8; 2308 FLAC__byte buffer[4]; /* magic number is asserted below */ 2309 2310 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8 == sizeof(buffer)); 2311 2312 status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, &(block->vendor_string), block_length); 2313 if(block_length >= 4) 2314 block_length -= 4; 2315 if(status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA) 2316 goto skip; 2317 else if(status != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) 2318 return status; 2319 block_length -= block->vendor_string.length; 2320 2321 if(block_length < num_comments_len) goto skip; else block_length -= num_comments_len; 2322 if(read_cb(buffer, 1, num_comments_len, handle) != num_comments_len) 2323 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2324 block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len); 2325 2326 if(block->num_comments == 0) { 2327 block->comments = 0; 2328 } 2329 else if(0 == (block->comments = calloc(block->num_comments, sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) { 2330 block->num_comments = 0; 2331 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 2332 } 2333 2334 for(i = 0; i < block->num_comments; i++) { 2335 status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, block->comments + i, block_length); 2336 if(block_length >= 4) block_length -= 4; 2337 if(status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA) { 2338 block->num_comments = i; 2339 goto skip; 2340 } 2341 else if(status != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) return status; 2342 block_length -= block->comments[i].length; 2343 } 2344 2345 skip: 2346 if(block_length > 0) { 2347 /* bad metadata */ 2348 if(0 != seek_cb(handle, block_length, SEEK_CUR)) 2349 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 2350 } 2351 2352 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; 2353 } 2354 2355 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track) 2356 { 2357 unsigned i, len; 2358 FLAC__byte buffer[32]; /* asserted below that this is big enough */ 2359 2360 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64)); 2361 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8); 2362 FLAC__ASSERT(sizeof(buffer) >= (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8); 2363 2364 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0); 2365 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8; 2366 if(read_cb(buffer, 1, len, handle) != len) 2367 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2368 track->offset = unpack_uint64_(buffer, len); 2369 2370 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0); 2371 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8; 2372 if(read_cb(buffer, 1, len, handle) != len) 2373 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2374 track->number = (FLAC__byte)unpack_uint32_(buffer, len); 2375 2376 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0); 2377 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8; 2378 if(read_cb(track->isrc, 1, len, handle) != len) 2379 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2380 2381 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) % 8 == 0); 2382 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8; 2383 if(read_cb(buffer, 1, len, handle) != len) 2384 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2385 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN == 1); 2386 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN == 1); 2387 track->type = buffer[0] >> 7; 2388 track->pre_emphasis = (buffer[0] >> 6) & 1; 2389 2390 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0); 2391 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8; 2392 if(read_cb(buffer, 1, len, handle) != len) 2393 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2394 track->num_indices = (FLAC__byte)unpack_uint32_(buffer, len); 2395 2396 if(track->num_indices == 0) { 2397 track->indices = 0; 2398 } 2399 else if(0 == (track->indices = calloc(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) 2400 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 2401 2402 for(i = 0; i < track->num_indices; i++) { 2403 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0); 2404 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8; 2405 if(read_cb(buffer, 1, len, handle) != len) 2406 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2407 track->indices[i].offset = unpack_uint64_(buffer, len); 2408 2409 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0); 2410 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8; 2411 if(read_cb(buffer, 1, len, handle) != len) 2412 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2413 track->indices[i].number = (FLAC__byte)unpack_uint32_(buffer, len); 2414 2415 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0); 2416 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8; 2417 if(read_cb(buffer, 1, len, handle) != len) 2418 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2419 } 2420 2421 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; 2422 } 2423 2424 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block) 2425 { 2426 unsigned i, len; 2427 FLAC__Metadata_SimpleIteratorStatus status; 2428 FLAC__byte buffer[1024]; /* MSVC needs a constant expression so we put a magic number and assert */ 2429 2430 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN)/8 <= sizeof(buffer)); 2431 FLAC__ASSERT(sizeof(FLAC__uint64) <= sizeof(buffer)); 2432 2433 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0); 2434 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8; 2435 if(read_cb(block->media_catalog_number, 1, len, handle) != len) 2436 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2437 2438 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0); 2439 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8; 2440 if(read_cb(buffer, 1, len, handle) != len) 2441 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2442 block->lead_in = unpack_uint64_(buffer, len); 2443 2444 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0); 2445 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8; 2446 if(read_cb(buffer, 1, len, handle) != len) 2447 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2448 block->is_cd = buffer[0]&0x80? true : false; 2449 2450 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0); 2451 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8; 2452 if(read_cb(buffer, 1, len, handle) != len) 2453 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2454 block->num_tracks = unpack_uint32_(buffer, len); 2455 2456 if(block->num_tracks == 0) { 2457 block->tracks = 0; 2458 } 2459 else if(0 == (block->tracks = calloc(block->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) 2460 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 2461 2462 for(i = 0; i < block->num_tracks; i++) { 2463 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_cuesheet_track_cb_(handle, read_cb, block->tracks + i))) 2464 return status; 2465 } 2466 2467 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; 2468 } 2469 2470 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cstring_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__byte **data, FLAC__uint32 *length, FLAC__uint32 length_len) 2471 { 2472 FLAC__byte buffer[sizeof(FLAC__uint32)]; 2473 2474 FLAC__ASSERT(0 != data); 2475 FLAC__ASSERT(length_len%8 == 0); 2476 2477 length_len /= 8; /* convert to bytes */ 2478 2479 FLAC__ASSERT(sizeof(buffer) >= length_len); 2480 2481 if(read_cb(buffer, 1, length_len, handle) != length_len) 2482 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2483 *length = unpack_uint32_(buffer, length_len); 2484 2485 if(0 != *data) 2486 free(*data); 2487 2488 if(0 == (*data = safe_malloc_add_2op_(*length, /*+*/1))) 2489 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 2490 2491 if(*length > 0) { 2492 if(read_cb(*data, 1, *length, handle) != *length) 2493 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2494 } 2495 2496 (*data)[*length] = '\0'; 2497 2498 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; 2499 } 2500 2501 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Picture *block) 2502 { 2503 FLAC__Metadata_SimpleIteratorStatus status; 2504 FLAC__byte buffer[4]; /* asserted below that this is big enough */ 2505 FLAC__uint32 len; 2506 2507 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8); 2508 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8); 2509 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8); 2510 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8); 2511 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8); 2512 2513 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_TYPE_LEN % 8 == 0); 2514 len = FLAC__STREAM_METADATA_PICTURE_TYPE_LEN / 8; 2515 if(read_cb(buffer, 1, len, handle) != len) 2516 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2517 block->type = (FLAC__StreamMetadata_Picture_Type)unpack_uint32_(buffer, len); 2518 2519 if((status = read_metadata_block_data_picture_cstring_cb_(handle, read_cb, (FLAC__byte**)(&(block->mime_type)), &len, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN)) != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) 2520 return status; 2521 2522 if((status = read_metadata_block_data_picture_cstring_cb_(handle, read_cb, &(block->description), &len, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN)) != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) 2523 return status; 2524 2525 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN % 8 == 0); 2526 len = FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN / 8; 2527 if(read_cb(buffer, 1, len, handle) != len) 2528 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2529 block->width = unpack_uint32_(buffer, len); 2530 2531 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN % 8 == 0); 2532 len = FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN / 8; 2533 if(read_cb(buffer, 1, len, handle) != len) 2534 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2535 block->height = unpack_uint32_(buffer, len); 2536 2537 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN % 8 == 0); 2538 len = FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN / 8; 2539 if(read_cb(buffer, 1, len, handle) != len) 2540 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2541 block->depth = unpack_uint32_(buffer, len); 2542 2543 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_COLORS_LEN % 8 == 0); 2544 len = FLAC__STREAM_METADATA_PICTURE_COLORS_LEN / 8; 2545 if(read_cb(buffer, 1, len, handle) != len) 2546 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2547 block->colors = unpack_uint32_(buffer, len); 2548 2549 /* for convenience we use read_metadata_block_data_picture_cstring_cb_() even though it adds an extra terminating NUL we don't use */ 2550 if((status = read_metadata_block_data_picture_cstring_cb_(handle, read_cb, &(block->data), &(block->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN)) != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) 2551 return status; 2552 2553 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; 2554 } 2555 2556 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, unsigned block_length) 2557 { 2558 if(block_length == 0) { 2559 block->data = 0; 2560 } 2561 else { 2562 if(0 == (block->data = malloc(block_length))) 2563 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 2564 2565 if(read_cb(block->data, 1, block_length, handle) != block_length) 2566 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 2567 } 2568 2569 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; 2570 } 2571 2572 FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block) 2573 { 2574 FLAC__ASSERT(0 != file); 2575 FLAC__ASSERT(0 != status); 2576 2577 if(!write_metadata_block_header_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) { 2578 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR; 2579 return false; 2580 } 2581 2582 return true; 2583 } 2584 2585 FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block) 2586 { 2587 FLAC__ASSERT(0 != file); 2588 FLAC__ASSERT(0 != status); 2589 2590 if (write_metadata_block_data_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) { 2591 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK; 2592 return true; 2593 } 2594 else { 2595 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR; 2596 return false; 2597 } 2598 } 2599 2600 FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block) 2601 { 2602 FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH]; 2603 2604 FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN)); 2605 /* double protection */ 2606 if(block->length >= (1u << FLAC__STREAM_METADATA_LENGTH_LEN)) 2607 return false; 2608 2609 buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type; 2610 pack_uint32_(block->length, buffer + 1, 3); 2611 2612 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH) 2613 return false; 2614 2615 return true; 2616 } 2617 2618 FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block) 2619 { 2620 FLAC__ASSERT(0 != block); 2621 2622 switch(block->type) { 2623 case FLAC__METADATA_TYPE_STREAMINFO: 2624 return write_metadata_block_data_streaminfo_cb_(handle, write_cb, &block->data.stream_info); 2625 case FLAC__METADATA_TYPE_PADDING: 2626 return write_metadata_block_data_padding_cb_(handle, write_cb, &block->data.padding, block->length); 2627 case FLAC__METADATA_TYPE_APPLICATION: 2628 return write_metadata_block_data_application_cb_(handle, write_cb, &block->data.application, block->length); 2629 case FLAC__METADATA_TYPE_SEEKTABLE: 2630 return write_metadata_block_data_seektable_cb_(handle, write_cb, &block->data.seek_table); 2631 case FLAC__METADATA_TYPE_VORBIS_COMMENT: 2632 return write_metadata_block_data_vorbis_comment_cb_(handle, write_cb, &block->data.vorbis_comment); 2633 case FLAC__METADATA_TYPE_CUESHEET: 2634 return write_metadata_block_data_cuesheet_cb_(handle, write_cb, &block->data.cue_sheet); 2635 case FLAC__METADATA_TYPE_PICTURE: 2636 return write_metadata_block_data_picture_cb_(handle, write_cb, &block->data.picture); 2637 default: 2638 return write_metadata_block_data_unknown_cb_(handle, write_cb, &block->data.unknown, block->length); 2639 } 2640 } 2641 2642 FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block) 2643 { 2644 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH]; 2645 const unsigned channels1 = block->channels - 1; 2646 const unsigned bps1 = block->bits_per_sample - 1; 2647 2648 /* we are using hardcoded numbers for simplicity but we should 2649 * probably eventually write a bit-level packer and use the 2650 * _STREAMINFO_ constants. 2651 */ 2652 pack_uint32_(block->min_blocksize, buffer, 2); 2653 pack_uint32_(block->max_blocksize, buffer+2, 2); 2654 pack_uint32_(block->min_framesize, buffer+4, 3); 2655 pack_uint32_(block->max_framesize, buffer+7, 3); 2656 buffer[10] = (block->sample_rate >> 12) & 0xff; 2657 buffer[11] = (block->sample_rate >> 4) & 0xff; 2658 buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4); 2659 buffer[13] = (FLAC__byte)(((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f)); 2660 pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4); 2661 memcpy(buffer+18, block->md5sum, 16); 2662 2663 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH) 2664 return false; 2665 2666 return true; 2667 } 2668 2669 FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, unsigned block_length) 2670 { 2671 unsigned i, n = block_length; 2672 FLAC__byte buffer[1024]; 2673 2674 (void)block; 2675 2676 memset(buffer, 0, 1024); 2677 2678 for(i = 0; i < n/1024; i++) 2679 if(write_cb(buffer, 1, 1024, handle) != 1024) 2680 return false; 2681 2682 n %= 1024; 2683 2684 if(write_cb(buffer, 1, n, handle) != n) 2685 return false; 2686 2687 return true; 2688 } 2689 2690 FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, unsigned block_length) 2691 { 2692 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8; 2693 2694 if(write_cb(block->id, 1, id_bytes, handle) != id_bytes) 2695 return false; 2696 2697 block_length -= id_bytes; 2698 2699 if(write_cb(block->data, 1, block_length, handle) != block_length) 2700 return false; 2701 2702 return true; 2703 } 2704 2705 FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block) 2706 { 2707 unsigned i; 2708 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH]; 2709 2710 for(i = 0; i < block->num_points; i++) { 2711 /* some MAGIC NUMBERs here */ 2712 pack_uint64_(block->points[i].sample_number, buffer, 8); 2713 pack_uint64_(block->points[i].stream_offset, buffer+8, 8); 2714 pack_uint32_(block->points[i].frame_samples, buffer+16, 2); 2715 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH) 2716 return false; 2717 } 2718 2719 return true; 2720 } 2721 2722 FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block) 2723 { 2724 unsigned i; 2725 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8; 2726 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8; 2727 FLAC__byte buffer[4]; /* magic number is asserted below */ 2728 2729 FLAC__ASSERT(flac_max(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8 == sizeof(buffer)); 2730 2731 pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len); 2732 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len) 2733 return false; 2734 if(write_cb(block->vendor_string.entry, 1, block->vendor_string.length, handle) != block->vendor_string.length) 2735 return false; 2736 2737 pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len); 2738 if(write_cb(buffer, 1, num_comments_len, handle) != num_comments_len) 2739 return false; 2740 2741 for(i = 0; i < block->num_comments; i++) { 2742 pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len); 2743 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len) 2744 return false; 2745 if(write_cb(block->comments[i].entry, 1, block->comments[i].length, handle) != block->comments[i].length) 2746 return false; 2747 } 2748 2749 return true; 2750 } 2751 2752 FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block) 2753 { 2754 unsigned i, j, len; 2755 FLAC__byte buffer[1024]; /* asserted below that this is big enough */ 2756 2757 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64)); 2758 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN/8); 2759 FLAC__ASSERT(sizeof(buffer) >= (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN)/8); 2760 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8); 2761 2762 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0); 2763 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8; 2764 if(write_cb(block->media_catalog_number, 1, len, handle) != len) 2765 return false; 2766 2767 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0); 2768 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8; 2769 pack_uint64_(block->lead_in, buffer, len); 2770 if(write_cb(buffer, 1, len, handle) != len) 2771 return false; 2772 2773 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0); 2774 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8; 2775 memset(buffer, 0, len); 2776 if(block->is_cd) 2777 buffer[0] |= 0x80; 2778 if(write_cb(buffer, 1, len, handle) != len) 2779 return false; 2780 2781 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0); 2782 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8; 2783 pack_uint32_(block->num_tracks, buffer, len); 2784 if(write_cb(buffer, 1, len, handle) != len) 2785 return false; 2786 2787 for(i = 0; i < block->num_tracks; i++) { 2788 FLAC__StreamMetadata_CueSheet_Track *track = block->tracks + i; 2789 2790 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0); 2791 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8; 2792 pack_uint64_(track->offset, buffer, len); 2793 if(write_cb(buffer, 1, len, handle) != len) 2794 return false; 2795 2796 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0); 2797 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8; 2798 pack_uint32_(track->number, buffer, len); 2799 if(write_cb(buffer, 1, len, handle) != len) 2800 return false; 2801 2802 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0); 2803 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8; 2804 if(write_cb(track->isrc, 1, len, handle) != len) 2805 return false; 2806 2807 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) % 8 == 0); 2808 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8; 2809 memset(buffer, 0, len); 2810 buffer[0] = (track->type << 7) | (track->pre_emphasis << 6); 2811 if(write_cb(buffer, 1, len, handle) != len) 2812 return false; 2813 2814 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0); 2815 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8; 2816 pack_uint32_(track->num_indices, buffer, len); 2817 if(write_cb(buffer, 1, len, handle) != len) 2818 return false; 2819 2820 for(j = 0; j < track->num_indices; j++) { 2821 FLAC__StreamMetadata_CueSheet_Index *indx = track->indices + j; 2822 2823 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0); 2824 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8; 2825 pack_uint64_(indx->offset, buffer, len); 2826 if(write_cb(buffer, 1, len, handle) != len) 2827 return false; 2828 2829 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0); 2830 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8; 2831 pack_uint32_(indx->number, buffer, len); 2832 if(write_cb(buffer, 1, len, handle) != len) 2833 return false; 2834 2835 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0); 2836 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8; 2837 memset(buffer, 0, len); 2838 if(write_cb(buffer, 1, len, handle) != len) 2839 return false; 2840 } 2841 } 2842 2843 return true; 2844 } 2845 2846 FLAC__bool write_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Picture *block) 2847 { 2848 unsigned len; 2849 size_t slen; 2850 FLAC__byte buffer[4]; /* magic number is asserted below */ 2851 2852 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_TYPE_LEN%8); 2853 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN%8); 2854 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN%8); 2855 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN%8); 2856 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN%8); 2857 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN%8); 2858 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_COLORS_LEN%8); 2859 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN%8); 2860 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8); 2861 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN/8); 2862 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN/8); 2863 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8); 2864 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8); 2865 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8); 2866 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8); 2867 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN/8); 2868 2869 len = FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8; 2870 pack_uint32_(block->type, buffer, len); 2871 if(write_cb(buffer, 1, len, handle) != len) 2872 return false; 2873 2874 len = FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN/8; 2875 slen = strlen(block->mime_type); 2876 pack_uint32_(slen, buffer, len); 2877 if(write_cb(buffer, 1, len, handle) != len) 2878 return false; 2879 if(write_cb(block->mime_type, 1, slen, handle) != slen) 2880 return false; 2881 2882 len = FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN/8; 2883 slen = strlen((const char *)block->description); 2884 pack_uint32_(slen, buffer, len); 2885 if(write_cb(buffer, 1, len, handle) != len) 2886 return false; 2887 if(write_cb(block->description, 1, slen, handle) != slen) 2888 return false; 2889 2890 len = FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8; 2891 pack_uint32_(block->width, buffer, len); 2892 if(write_cb(buffer, 1, len, handle) != len) 2893 return false; 2894 2895 len = FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8; 2896 pack_uint32_(block->height, buffer, len); 2897 if(write_cb(buffer, 1, len, handle) != len) 2898 return false; 2899 2900 len = FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8; 2901 pack_uint32_(block->depth, buffer, len); 2902 if(write_cb(buffer, 1, len, handle) != len) 2903 return false; 2904 2905 len = FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8; 2906 pack_uint32_(block->colors, buffer, len); 2907 if(write_cb(buffer, 1, len, handle) != len) 2908 return false; 2909 2910 len = FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN/8; 2911 pack_uint32_(block->data_length, buffer, len); 2912 if(write_cb(buffer, 1, len, handle) != len) 2913 return false; 2914 if(write_cb(block->data, 1, block->data_length, handle) != block->data_length) 2915 return false; 2916 2917 return true; 2918 } 2919 2920 FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, unsigned block_length) 2921 { 2922 if(write_cb(block->data, 1, block_length, handle) != block_length) 2923 return false; 2924 2925 return true; 2926 } 2927 2928 FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block) 2929 { 2930 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) { 2931 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 2932 return false; 2933 } 2934 2935 if(!write_metadata_block_header_(iterator->file, &iterator->status, block)) 2936 return false; 2937 2938 if(!write_metadata_block_data_(iterator->file, &iterator->status, block)) 2939 return false; 2940 2941 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) { 2942 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 2943 return false; 2944 } 2945 2946 return read_metadata_block_header_(iterator); 2947 } 2948 2949 FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last) 2950 { 2951 FLAC__StreamMetadata *padding; 2952 2953 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) { 2954 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 2955 return false; 2956 } 2957 2958 block->is_last = false; 2959 2960 if(!write_metadata_block_header_(iterator->file, &iterator->status, block)) 2961 return false; 2962 2963 if(!write_metadata_block_data_(iterator->file, &iterator->status, block)) 2964 return false; 2965 2966 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) 2967 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 2968 2969 padding->is_last = padding_is_last; 2970 padding->length = padding_length; 2971 2972 if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) { 2973 FLAC__metadata_object_delete(padding); 2974 return false; 2975 } 2976 2977 if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) { 2978 FLAC__metadata_object_delete(padding); 2979 return false; 2980 } 2981 2982 FLAC__metadata_object_delete(padding); 2983 2984 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) { 2985 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 2986 return false; 2987 } 2988 2989 return read_metadata_block_header_(iterator); 2990 } 2991 2992 FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append) 2993 { 2994 FILE *tempfile = NULL; 2995 char *tempfilename = NULL; 2996 int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */ 2997 FLAC__off_t fixup_is_last_flag_offset = -1; 2998 2999 FLAC__ASSERT(0 != block || append == false); 3000 3001 if(iterator->is_last) { 3002 if(append) { 3003 fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */ 3004 fixup_is_last_flag_offset = iterator->offset[iterator->depth]; 3005 } 3006 else if(0 == block) { 3007 simple_iterator_push_(iterator); 3008 if(!FLAC__metadata_simple_iterator_prev(iterator)) { 3009 (void)simple_iterator_pop_(iterator); 3010 return false; 3011 } 3012 fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */ 3013 fixup_is_last_flag_offset = iterator->offset[iterator->depth]; 3014 if(!simple_iterator_pop_(iterator)) 3015 return false; 3016 } 3017 } 3018 3019 if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append)) 3020 return false; 3021 3022 if(0 != block) { 3023 if(!write_metadata_block_header_(tempfile, &iterator->status, block)) { 3024 cleanup_tempfile_(&tempfile, &tempfilename); 3025 return false; 3026 } 3027 3028 if(!write_metadata_block_data_(tempfile, &iterator->status, block)) { 3029 cleanup_tempfile_(&tempfile, &tempfilename); 3030 return false; 3031 } 3032 } 3033 3034 if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0)) 3035 return false; 3036 3037 if(append) 3038 return FLAC__metadata_simple_iterator_next(iterator); 3039 3040 return true; 3041 } 3042 3043 void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator) 3044 { 3045 FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH); 3046 iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth]; 3047 iterator->depth++; 3048 } 3049 3050 FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator) 3051 { 3052 FLAC__ASSERT(iterator->depth > 0); 3053 iterator->depth--; 3054 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) { 3055 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 3056 return false; 3057 } 3058 3059 return read_metadata_block_header_(iterator); 3060 } 3061 3062 /* return meanings: 3063 * 0: ok 3064 * 1: read error 3065 * 2: seek error 3066 * 3: not a FLAC file 3067 */ 3068 unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb) 3069 { 3070 FLAC__byte buffer[4]; 3071 size_t n; 3072 unsigned i; 3073 3074 FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == sizeof(buffer)); 3075 3076 /* skip any id3v2 tag */ 3077 errno = 0; 3078 n = read_cb(buffer, 1, 4, handle); 3079 if(errno) 3080 return 1; 3081 else if(n != 4) 3082 return 3; 3083 else if(0 == memcmp(buffer, "ID3", 3)) { 3084 unsigned tag_length = 0; 3085 3086 /* skip to the tag length */ 3087 if(seek_cb(handle, 2, SEEK_CUR) < 0) 3088 return 2; 3089 3090 /* read the length */ 3091 for(i = 0; i < 4; i++) { 3092 if(read_cb(buffer, 1, 1, handle) < 1 || buffer[0] & 0x80) 3093 return 1; 3094 tag_length <<= 7; 3095 tag_length |= (buffer[0] & 0x7f); 3096 } 3097 3098 /* skip the rest of the tag */ 3099 if(seek_cb(handle, tag_length, SEEK_CUR) < 0) 3100 return 2; 3101 3102 /* read the stream sync code */ 3103 errno = 0; 3104 n = read_cb(buffer, 1, 4, handle); 3105 if(errno) 3106 return 1; 3107 else if(n != 4) 3108 return 3; 3109 } 3110 3111 /* check for the fLaC signature */ 3112 if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH)) 3113 return 0; 3114 else 3115 return 3; 3116 } 3117 3118 unsigned seek_to_first_metadata_block_(FILE *f) 3119 { 3120 return seek_to_first_metadata_block_cb_((FLAC__IOHandle)f, (FLAC__IOCallback_Read)fread, fseek_wrapper_); 3121 } 3122 3123 FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append) 3124 { 3125 const FLAC__off_t offset_end = append? iterator->offset[iterator->depth] + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length : iterator->offset[iterator->depth]; 3126 3127 if(0 != fseeko(iterator->file, 0, SEEK_SET)) { 3128 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 3129 return false; 3130 } 3131 if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) { 3132 cleanup_tempfile_(tempfile, tempfilename); 3133 return false; 3134 } 3135 if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) { 3136 cleanup_tempfile_(tempfile, tempfilename); 3137 return false; 3138 } 3139 3140 return true; 3141 } 3142 3143 FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, FLAC__off_t fixup_is_last_flag_offset, FLAC__bool backup) 3144 { 3145 FLAC__off_t save_offset = iterator->offset[iterator->depth]; 3146 FLAC__ASSERT(0 != *tempfile); 3147 3148 if(0 != fseeko(iterator->file, save_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length, SEEK_SET)) { 3149 cleanup_tempfile_(tempfile, tempfilename); 3150 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 3151 return false; 3152 } 3153 if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) { 3154 cleanup_tempfile_(tempfile, tempfilename); 3155 return false; 3156 } 3157 3158 if(fixup_is_last_code != 0) { 3159 /* 3160 * if code == 1, it means a block was appended to the end so 3161 * we have to clear the is_last flag of the previous block 3162 * if code == -1, it means the last block was deleted so 3163 * we have to set the is_last flag of the previous block 3164 */ 3165 /* MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */ 3166 FLAC__byte x; 3167 if(0 != fseeko(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) { 3168 cleanup_tempfile_(tempfile, tempfilename); 3169 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 3170 return false; 3171 } 3172 if(fread(&x, 1, 1, *tempfile) != 1) { 3173 cleanup_tempfile_(tempfile, tempfilename); 3174 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 3175 return false; 3176 } 3177 if(fixup_is_last_code > 0) { 3178 FLAC__ASSERT(x & 0x80); 3179 x &= 0x7f; 3180 } 3181 else { 3182 FLAC__ASSERT(!(x & 0x80)); 3183 x |= 0x80; 3184 } 3185 if(0 != fseeko(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) { 3186 cleanup_tempfile_(tempfile, tempfilename); 3187 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR; 3188 return false; 3189 } 3190 if(local__fwrite(&x, 1, 1, *tempfile) != 1) { 3191 cleanup_tempfile_(tempfile, tempfilename); 3192 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR; 3193 return false; 3194 } 3195 } 3196 3197 (void)fclose(iterator->file); 3198 3199 if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status)) 3200 return false; 3201 3202 if(iterator->has_stats) 3203 set_file_stats_(iterator->filename, &iterator->stats); 3204 3205 if(!simple_iterator_prime_input_(iterator, !iterator->is_writable)) 3206 return false; 3207 if(backup) { 3208 while(iterator->offset[iterator->depth] + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length < save_offset) 3209 if(!FLAC__metadata_simple_iterator_next(iterator)) 3210 return false; 3211 return true; 3212 } 3213 else { 3214 /* move the iterator to it's original block faster by faking a push, then doing a pop_ */ 3215 FLAC__ASSERT(iterator->depth == 0); 3216 iterator->offset[0] = save_offset; 3217 iterator->depth++; 3218 return simple_iterator_pop_(iterator); 3219 } 3220 } 3221 3222 FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status) 3223 { 3224 FLAC__byte buffer[8192]; 3225 size_t n; 3226 3227 FLAC__ASSERT(bytes >= 0); 3228 while(bytes > 0) { 3229 n = flac_min(sizeof(buffer), (size_t)bytes); 3230 if(fread(buffer, 1, n, file) != n) { 3231 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 3232 return false; 3233 } 3234 if(local__fwrite(buffer, 1, n, tempfile) != n) { 3235 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR; 3236 return false; 3237 } 3238 bytes -= n; 3239 } 3240 3241 return true; 3242 } 3243 3244 FLAC__bool copy_n_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status) 3245 { 3246 FLAC__byte buffer[8192]; 3247 size_t n; 3248 3249 FLAC__ASSERT(bytes >= 0); 3250 while(bytes > 0) { 3251 n = flac_min(sizeof(buffer), (size_t)bytes); 3252 if(read_cb(buffer, 1, n, handle) != n) { 3253 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 3254 return false; 3255 } 3256 if(temp_write_cb(buffer, 1, n, temp_handle) != n) { 3257 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR; 3258 return false; 3259 } 3260 bytes -= n; 3261 } 3262 3263 return true; 3264 } 3265 3266 FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status) 3267 { 3268 FLAC__byte buffer[8192]; 3269 size_t n; 3270 3271 while(!feof(file)) { 3272 n = fread(buffer, 1, sizeof(buffer), file); 3273 if(n == 0 && !feof(file)) { 3274 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 3275 return false; 3276 } 3277 if(n > 0 && local__fwrite(buffer, 1, n, tempfile) != n) { 3278 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR; 3279 return false; 3280 } 3281 } 3282 3283 return true; 3284 } 3285 3286 FLAC__bool copy_remaining_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Eof eof_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__Metadata_SimpleIteratorStatus *status) 3287 { 3288 FLAC__byte buffer[8192]; 3289 size_t n; 3290 3291 while(!eof_cb(handle)) { 3292 n = read_cb(buffer, 1, sizeof(buffer), handle); 3293 if(n == 0 && !eof_cb(handle)) { 3294 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR; 3295 return false; 3296 } 3297 if(n > 0 && temp_write_cb(buffer, 1, n, temp_handle) != n) { 3298 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR; 3299 return false; 3300 } 3301 } 3302 3303 return true; 3304 } 3305 3306 static int 3307 local_snprintf(char *str, size_t size, const char *fmt, ...) 3308 { 3309 va_list va; 3310 int rc; 3311 3312 #if defined _MSC_VER 3313 if (size == 0) 3314 return 1024; 3315 #endif 3316 3317 va_start (va, fmt); 3318 3319 #if defined _MSC_VER 3320 rc = vsnprintf_s (str, size, _TRUNCATE, fmt, va); 3321 if (rc < 0) 3322 rc = size - 1; 3323 #elif defined __MINGW32__ 3324 rc = __mingw_vsnprintf (str, size, fmt, va); 3325 #else 3326 rc = vsnprintf (str, size, fmt, va); 3327 #endif 3328 va_end (va); 3329 3330 return rc; 3331 } 3332 3333 FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status) 3334 { 3335 static const char *tempfile_suffix = ".metadata_edit"; 3336 if(0 == tempfile_path_prefix) { 3337 size_t dest_len = strlen(filename) + strlen(tempfile_suffix) + 1; 3338 if(0 == (*tempfilename = safe_malloc_(dest_len))) { 3339 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 3340 return false; 3341 } 3342 local_snprintf(*tempfilename, dest_len, "%s%s", filename, tempfile_suffix); 3343 } 3344 else { 3345 const char *p = strrchr(filename, '/'); 3346 size_t dest_len; 3347 if(0 == p) 3348 p = filename; 3349 else 3350 p++; 3351 3352 dest_len = strlen(tempfile_path_prefix) + strlen(p) + strlen(tempfile_suffix) + 2; 3353 3354 if(0 == (*tempfilename = safe_malloc_(dest_len))) { 3355 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR; 3356 return false; 3357 } 3358 local_snprintf(*tempfilename, dest_len, "%s/%s%s", tempfile_path_prefix, p, tempfile_suffix); 3359 } 3360 3361 if(0 == (*tempfile = flac_fopen(*tempfilename, "w+b"))) { 3362 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE; 3363 return false; 3364 } 3365 3366 return true; 3367 } 3368 3369 FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status) 3370 { 3371 FLAC__ASSERT(0 != filename); 3372 FLAC__ASSERT(0 != tempfile); 3373 FLAC__ASSERT(0 != *tempfile); 3374 FLAC__ASSERT(0 != tempfilename); 3375 FLAC__ASSERT(0 != *tempfilename); 3376 FLAC__ASSERT(0 != status); 3377 3378 (void)fclose(*tempfile); 3379 *tempfile = 0; 3380 3381 #if defined _MSC_VER || defined __BORLANDC__ || defined __MINGW32__ || defined __EMX__ 3382 /* on some flavors of windows, flac_rename() will fail if the destination already exists */ 3383 if(flac_unlink(filename) < 0) { 3384 cleanup_tempfile_(tempfile, tempfilename); 3385 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR; 3386 return false; 3387 } 3388 #endif 3389 3390 /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just flac_rename(): */ 3391 if(0 != flac_rename(*tempfilename, filename)) { 3392 cleanup_tempfile_(tempfile, tempfilename); 3393 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR; 3394 return false; 3395 } 3396 3397 cleanup_tempfile_(tempfile, tempfilename); 3398 3399 return true; 3400 } 3401 3402 void cleanup_tempfile_(FILE **tempfile, char **tempfilename) 3403 { 3404 if(0 != *tempfile) { 3405 (void)fclose(*tempfile); 3406 *tempfile = 0; 3407 } 3408 3409 if(0 != *tempfilename) { 3410 (void)flac_unlink(*tempfilename); 3411 free(*tempfilename); 3412 *tempfilename = 0; 3413 } 3414 } 3415 3416 FLAC__bool get_file_stats_(const char *filename, struct flac_stat_s *stats) 3417 { 3418 FLAC__ASSERT(0 != filename); 3419 FLAC__ASSERT(0 != stats); 3420 return (0 == flac_stat(filename, stats)); 3421 } 3422 3423 void set_file_stats_(const char *filename, struct flac_stat_s *stats) 3424 { 3425 struct utimbuf srctime; 3426 3427 FLAC__ASSERT(0 != filename); 3428 FLAC__ASSERT(0 != stats); 3429 3430 srctime.actime = stats->st_atime; 3431 srctime.modtime = stats->st_mtime; 3432 (void)flac_chmod(filename, stats->st_mode); 3433 (void)flac_utime(filename, &srctime); 3434 #if !defined _MSC_VER && !defined __BORLANDC__ && !defined __MINGW32__ 3435 FLAC_CHECK_RETURN(chown(filename, stats->st_uid, -1)); 3436 FLAC_CHECK_RETURN(chown(filename, -1, stats->st_gid)); 3437 #endif 3438 } 3439 3440 int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence) 3441 { 3442 return fseeko((FILE*)handle, (FLAC__off_t)offset, whence); 3443 } 3444 3445 FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle) 3446 { 3447 return ftello((FILE*)handle); 3448 } 3449 3450 FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status) 3451 { 3452 switch(status) { 3453 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK: 3454 return FLAC__METADATA_CHAIN_STATUS_OK; 3455 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT: 3456 return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT; 3457 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE: 3458 return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE; 3459 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE: 3460 return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE; 3461 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE: 3462 return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE; 3463 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA: 3464 return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA; 3465 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR: 3466 return FLAC__METADATA_CHAIN_STATUS_READ_ERROR; 3467 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR: 3468 return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR; 3469 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR: 3470 return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR; 3471 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR: 3472 return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR; 3473 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR: 3474 return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR; 3475 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR: 3476 return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR; 3477 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR: 3478 default: 3479 return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; 3480 } 3481 } 3482
