src/libFLAC/metadata_object.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2001,2002  Josh Coalson
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA  02111-1307, USA.
  18  */
  19
  20 #include <stdlib.h>
  21 #include <string.h>
  22
  23 #include "private/metadata.h"
  24
  25 #include "FLAC/assert.h"
  26
  27
  28 /****************************************************************************
  29  *
  30  * Local routines
  31  *
  32  ***************************************************************************/
  33
  34 static FLAC__bool copy_bytes_(FLAC__byte **to, const FLAC__byte *from, unsigned bytes)
  35 {
  36         if(bytes > 0 && 0 != from) {
  37                 FLAC__byte *x;
  38                 if(0 == (x = (FLAC__byte*)malloc(bytes)))
  39                         return false;
  40                 memcpy(x, from, bytes);
  41                 *to = x;
  42         }
  43         else {
  44                 FLAC__ASSERT(0 == from);
  45                 FLAC__ASSERT(bytes == 0);
  46                 *to = 0;
  47         }
  48         return true;
  49 }
  50
  51 static FLAC__bool copy_vcentry_(FLAC__StreamMetadata_VorbisComment_Entry *to, const FLAC__StreamMetadata_VorbisComment_Entry *from)
  52 {
  53         to->length = from->length;
  54         if(0 == from->entry) {
  55                 FLAC__ASSERT(from->length == 0);
  56                 to->entry = 0;
  57         }
  58         else {
  59                 FLAC__byte *x;
  60                 FLAC__ASSERT(from->length > 0);
  61                 if(0 == (x = (FLAC__byte*)malloc(from->length)))
  62                         return false;
  63                 memcpy(x, from->entry, from->length);
  64                 to->entry = x;
  65         }
  66         return true;
  67 }
  68
  69 static FLAC__bool copy_track_(FLAC__StreamMetadata_CueSheet_Track *to, const FLAC__StreamMetadata_CueSheet_Track *from)
  70 {
  71         memcpy(to, from, sizeof(FLAC__StreamMetadata_CueSheet_Track));
  72         if(0 == from->indices) {
  73                 FLAC__ASSERT(from->num_indices == 0);
  74         }
  75         else {
  76                 FLAC__StreamMetadata_CueSheet_Index *x;
  77                 FLAC__ASSERT(from->num_indices > 0);
  78                 if(0 == (x = (FLAC__StreamMetadata_CueSheet_Index*)malloc(from->num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index))))
  79                         return false;
  80                 memcpy(x, from->indices, from->num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index));
  81                 to->indices = x;
  82         }
  83         return true;
  84 }
  85
  86 static void seektable_calculate_length_(FLAC__StreamMetadata *object)
  87 {
  88         FLAC__ASSERT(0 != object);
  89         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
  90
  91         object->length = object->data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
  92 }
  93
  94 static FLAC__StreamMetadata_SeekPoint *seekpoint_array_new_(unsigned num_points)
  95 {
  96         FLAC__StreamMetadata_SeekPoint *object_array;
  97
  98         FLAC__ASSERT(num_points > 0);
  99
 100         object_array = (FLAC__StreamMetadata_SeekPoint*)malloc(num_points * sizeof(FLAC__StreamMetadata_SeekPoint));
 101
 102         if(0 != object_array) {
 103                 unsigned i;
 104                 for(i = 0; i < num_points; i++) {
 105                         object_array[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
 106                         object_array[i].stream_offset = 0;
 107                         object_array[i].frame_samples = 0;
 108                 }
 109         }
 110
 111         return object_array;
 112 }
 113
 114 static void vorbiscomment_calculate_length_(FLAC__StreamMetadata *object)
 115 {
 116         unsigned i;
 117
 118         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 119
 120         object->length = (FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN) / 8;
 121         object->length += object->data.vorbis_comment.vendor_string.length;
 122         object->length += (FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8;
 123         for(i = 0; i < object->data.vorbis_comment.num_comments; i++) {
 124                 object->length += (FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8);
 125                 object->length += object->data.vorbis_comment.comments[i].length;
 126         }
 127 }
 128
 129 static FLAC__StreamMetadata_VorbisComment_Entry *vorbiscomment_entry_array_new_(unsigned num_comments)
 130 {
 131         FLAC__ASSERT(num_comments > 0);
 132
 133         return (FLAC__StreamMetadata_VorbisComment_Entry*)calloc(num_comments, sizeof(FLAC__StreamMetadata_VorbisComment_Entry));
 134 }
 135
 136 static void vorbiscomment_entry_array_delete_(FLAC__StreamMetadata_VorbisComment_Entry *object_array, unsigned num_comments)
 137 {
 138         unsigned i;
 139
 140         FLAC__ASSERT(0 != object_array && num_comments > 0);
 141
 142         for(i = 0; i < num_comments; i++)
 143                 if(0 != object_array[i].entry)
 144                         free(object_array[i].entry);
 145
 146         if(0 != object_array)
 147                 free(object_array);
 148 }
 149
 150 static FLAC__StreamMetadata_VorbisComment_Entry *vorbiscomment_entry_array_copy_(const FLAC__StreamMetadata_VorbisComment_Entry *object_array, unsigned num_comments)
 151 {
 152         FLAC__StreamMetadata_VorbisComment_Entry *return_array;
 153
 154         FLAC__ASSERT(0 != object_array);
 155         FLAC__ASSERT(num_comments > 0);
 156
 157         return_array = vorbiscomment_entry_array_new_(num_comments);
 158
 159         if(0 != return_array) {
 160                 unsigned i;
 161
 162                 for(i = 0; i < num_comments; i++) {
 163                         if(!copy_vcentry_(return_array+i, object_array+i)) {
 164                                 vorbiscomment_entry_array_delete_(return_array, num_comments);
 165                                 return 0;
 166                         }
 167                 }
 168         }
 169
 170         return return_array;
 171 }
 172
 173 static FLAC__bool vorbiscomment_set_entry_(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry *dest, const FLAC__StreamMetadata_VorbisComment_Entry *src, FLAC__bool copy)
 174 {
 175         FLAC__byte *save;
 176
 177         FLAC__ASSERT(0 != object);
 178         FLAC__ASSERT(0 != dest);
 179         FLAC__ASSERT(0 != src);
 180         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 181         FLAC__ASSERT((0 != src->entry && src->length > 0) || (0 == src->entry && src->length == 0 && copy == false));
 182
 183         save = dest->entry;
 184
 185         /* do the copy first so that if we fail we leave the object untouched */
 186         if(copy) {
 187                 if(!copy_vcentry_(dest, src))
 188                         return false;
 189         }
 190         else {
 191                 *dest = *src;
 192         }
 193
 194         if(0 != save)
 195                 free(save);
 196
 197         vorbiscomment_calculate_length_(object);
 198         return true;
 199 }
 200
 201 static void cuesheet_calculate_length_(FLAC__StreamMetadata *object)
 202 {
 203         unsigned i;
 204
 205         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
 206
 207         object->length = (
 208                 FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN +
 209                 FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN +
 210                 FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN +
 211                 FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN
 212         ) / 8;
 213
 214         object->length += object->data.cue_sheet.num_tracks * (
 215                 FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN +
 216                 FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN +
 217                 FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN +
 218                 FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN +
 219                 FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN +
 220                 FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN +
 221                 FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN
 222         ) / 8;
 223
 224         for(i = 0; i < object->data.cue_sheet.num_tracks; i++) {
 225                 object->length += object->data.cue_sheet.tracks[i].num_indices * (
 226                         FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN +
 227                         FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN +
 228                         FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN
 229                 ) / 8;
 230         }
 231 }
 232
 233 static FLAC__StreamMetadata_CueSheet_Index *cuesheet_track_index_array_new_(unsigned num_indices)
 234 {
 235         FLAC__ASSERT(num_indices > 0);
 236
 237         return (FLAC__StreamMetadata_CueSheet_Index*)calloc(num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index));
 238 }
 239
 240 static FLAC__StreamMetadata_CueSheet_Track *cuesheet_track_array_new_(unsigned num_tracks)
 241 {
 242         FLAC__ASSERT(num_tracks > 0);
 243
 244         return (FLAC__StreamMetadata_CueSheet_Track*)calloc(num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track));
 245 }
 246
 247 static void cuesheet_track_array_delete_(FLAC__StreamMetadata_CueSheet_Track *object_array, unsigned num_tracks)
 248 {
 249         unsigned i;
 250
 251         FLAC__ASSERT(0 != object_array && num_tracks > 0);
 252
 253         for(i = 0; i < num_tracks; i++) {
 254                 if(0 != object_array[i].indices) {
 255                         FLAC__ASSERT(object_array[i].num_indices > 0);
 256                         free(object_array[i].indices);
 257                 }
 258         }
 259
 260         if(0 != object_array)
 261                 free(object_array);
 262 }
 263
 264 static FLAC__StreamMetadata_CueSheet_Track *cuesheet_track_array_copy_(const FLAC__StreamMetadata_CueSheet_Track *object_array, unsigned num_tracks)
 265 {
 266         FLAC__StreamMetadata_CueSheet_Track *return_array;
 267
 268         FLAC__ASSERT(0 != object_array);
 269         FLAC__ASSERT(num_tracks > 0);
 270
 271         return_array = cuesheet_track_array_new_(num_tracks);
 272
 273         if(0 != return_array) {
 274                 unsigned i;
 275
 276                 for(i = 0; i < num_tracks; i++) {
 277                         if(!copy_track_(return_array+i, object_array+i)) {
 278                                 cuesheet_track_array_delete_(return_array, num_tracks);
 279                                 return 0;
 280                         }
 281                 }
 282         }
 283
 284         return return_array;
 285 }
 286
 287 static FLAC__bool cuesheet_set_track_(FLAC__StreamMetadata *object, FLAC__StreamMetadata_CueSheet_Track *dest, const FLAC__StreamMetadata_CueSheet_Track *src, FLAC__bool copy)
 288 {
 289         FLAC__StreamMetadata_CueSheet_Index *save;
 290
 291         FLAC__ASSERT(0 != object);
 292         FLAC__ASSERT(0 != dest);
 293         FLAC__ASSERT(0 != src);
 294         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
 295         FLAC__ASSERT((0 != src->indices && src->num_indices > 0) || (0 == src->indices && src->num_indices == 0));
 296         /*@@@@ for docs, note that there is no "&& copy == false" at the end here ^^^ which will filter up */
 297
 298         save = dest->indices;
 299
 300         /* do the copy first so that if we fail we leave the object untouched */
 301         if(copy) {
 302                 if(!copy_track_(dest, src))
 303                         return false;
 304         }
 305         else {
 306                 *dest = *src;
 307         }
 308
 309         if(0 != save)
 310                 free(save);
 311
 312         cuesheet_calculate_length_(object);
 313         return true;
 314 }
 315
 316
 317 /****************************************************************************
 318  *
 319  * Metadata object routines
 320  *
 321  ***************************************************************************/
 322
 323 FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_new(FLAC__MetadataType type)
 324 {
 325         FLAC__StreamMetadata *object = (FLAC__StreamMetadata*)calloc(1, sizeof(FLAC__StreamMetadata));
 326         if(0 != object) {
 327                 object->is_last = false;
 328                 object->type = type;
 329                 switch(type) {
 330                         case FLAC__METADATA_TYPE_STREAMINFO:
 331                                 object->length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
 332                                 break;
 333                         case FLAC__METADATA_TYPE_PADDING:
 334                                 break;
 335                         case FLAC__METADATA_TYPE_APPLICATION:
 336                                 object->length = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
 337                                 break;
 338                         case FLAC__METADATA_TYPE_SEEKTABLE:
 339                                 break;
 340                         case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 341                                 {
 342                                         object->data.vorbis_comment.vendor_string.length = (unsigned)strlen(FLAC__VENDOR_STRING);
 343                                         if(!copy_bytes_(&object->data.vorbis_comment.vendor_string.entry, (const FLAC__byte*)FLAC__VENDOR_STRING, object->data.vorbis_comment.vendor_string.length)) {
 344                                                 free(object);
 345                                                 return 0;
 346                                         }
 347                                         vorbiscomment_calculate_length_(object);
 348                                 }
 349                                 break;
 350                         case FLAC__METADATA_TYPE_CUESHEET:
 351                                 cuesheet_calculate_length_(object);
 352                                 break;
 353                         default:
 354                                 /* double protection: */
 355                                 FLAC__ASSERT(0);
 356                                 free(object);
 357                                 return 0;
 358                 }
 359         }
 360
 361         return object;
 362 }
 363
 364 FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_clone(const FLAC__StreamMetadata *object)
 365 {
 366         FLAC__StreamMetadata *to;
 367
 368         FLAC__ASSERT(0 != object);
 369
 370         if(0 != (to = FLAC__metadata_object_new(object->type))) {
 371                 to->is_last = object->is_last;
 372                 to->type = object->type;
 373                 to->length = object->length;
 374                 switch(to->type) {
 375                         case FLAC__METADATA_TYPE_STREAMINFO:
 376                                 memcpy(&to->data.stream_info, &object->data.stream_info, sizeof(FLAC__StreamMetadata_StreamInfo));
 377                                 break;
 378                         case FLAC__METADATA_TYPE_PADDING:
 379                                 break;
 380                         case FLAC__METADATA_TYPE_APPLICATION:
 381                                 memcpy(&to->data.application.id, &object->data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8);
 382                                 if(!copy_bytes_(&to->data.application.data, object->data.application.data, object->length - FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8)) {
 383                                         FLAC__metadata_object_delete(to);
 384                                         return 0;
 385                                 }
 386                                 break;
 387                         case FLAC__METADATA_TYPE_SEEKTABLE:
 388                                 to->data.seek_table.num_points = object->data.seek_table.num_points;
 389                                 if(!copy_bytes_((FLAC__byte**)&to->data.seek_table.points, (FLAC__byte*)object->data.seek_table.points, object->data.seek_table.num_points * sizeof(FLAC__StreamMetadata_SeekPoint))) {
 390                                         FLAC__metadata_object_delete(to);
 391                                         return 0;
 392                                 }
 393                                 break;
 394                         case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 395                                 if(0 != to->data.vorbis_comment.vendor_string.entry)
 396                                         free(to->data.vorbis_comment.vendor_string.entry);
 397                                 if(!copy_vcentry_(&to->data.vorbis_comment.vendor_string, &object->data.vorbis_comment.vendor_string)) {
 398                                         FLAC__metadata_object_delete(to);
 399                                         return 0;
 400                                 }
 401                                 if(object->data.vorbis_comment.num_comments == 0) {
 402                                         FLAC__ASSERT(0 == object->data.vorbis_comment.comments);
 403                                         to->data.vorbis_comment.comments = 0;
 404                                 }
 405                                 else {
 406                                         FLAC__ASSERT(0 != object->data.vorbis_comment.comments);
 407                                         to->data.vorbis_comment.comments = vorbiscomment_entry_array_copy_(object->data.vorbis_comment.comments, object->data.vorbis_comment.num_comments);
 408                                         if(0 == to->data.vorbis_comment.comments) {
 409                                                 FLAC__metadata_object_delete(to);
 410                                                 return 0;
 411                                         }
 412                                 }
 413                                 to->data.vorbis_comment.num_comments = object->data.vorbis_comment.num_comments;
 414                                 break;
 415                         case FLAC__METADATA_TYPE_CUESHEET:
 416                                 memcpy(&to->data.cue_sheet, &object->data.cue_sheet, sizeof(FLAC__StreamMetadata_CueSheet));
 417                                 if(object->data.cue_sheet.num_tracks == 0) {
 418                                         FLAC__ASSERT(0 == object->data.cue_sheet.tracks);
 419                                 }
 420                                 else {
 421                                         FLAC__ASSERT(0 != object->data.cue_sheet.tracks);
 422                                         to->data.cue_sheet.tracks = cuesheet_track_array_copy_(object->data.cue_sheet.tracks, object->data.cue_sheet.num_tracks);
 423                                         if(0 == to->data.cue_sheet.tracks) {
 424                                                 FLAC__metadata_object_delete(to);
 425                                                 return 0;
 426                                         }
 427                                 }
 428                                 break;
 429                         default:
 430                                 /* double protection: */
 431                                 FLAC__ASSERT(0);
 432                                 free(to);
 433                                 return 0;
 434                 }
 435         }
 436
 437         return to;
 438 }
 439
 440 void FLAC__metadata_object_delete_data(FLAC__StreamMetadata *object)
 441 {
 442         FLAC__ASSERT(0 != object);
 443
 444         switch(object->type) {
 445                 case FLAC__METADATA_TYPE_STREAMINFO:
 446                 case FLAC__METADATA_TYPE_PADDING:
 447                         break;
 448                 case FLAC__METADATA_TYPE_APPLICATION:
 449                         if(0 != object->data.application.data)
 450                                 free(object->data.application.data);
 451                         break;
 452                 case FLAC__METADATA_TYPE_SEEKTABLE:
 453                         if(0 != object->data.seek_table.points)
 454                                 free(object->data.seek_table.points);
 455                         break;
 456                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 457                         if(0 != object->data.vorbis_comment.vendor_string.entry)
 458                                 free(object->data.vorbis_comment.vendor_string.entry);
 459                         if(0 != object->data.vorbis_comment.comments) {
 460                                 FLAC__ASSERT(object->data.vorbis_comment.num_comments > 0);
 461                                 vorbiscomment_entry_array_delete_(object->data.vorbis_comment.comments, object->data.vorbis_comment.num_comments);
 462                         }
 463                         break;
 464                 case FLAC__METADATA_TYPE_CUESHEET:
 465                         if(0 != object->data.cue_sheet.tracks) {
 466                                 FLAC__ASSERT(object->data.cue_sheet.num_tracks > 0);
 467                                 cuesheet_track_array_delete_(object->data.cue_sheet.tracks, object->data.cue_sheet.num_tracks);
 468                         }
 469                         break;
 470                 default:
 471                         FLAC__ASSERT(0);
 472         }
 473 }
 474
 475 FLAC_API void FLAC__metadata_object_delete(FLAC__StreamMetadata *object)
 476 {
 477         FLAC__metadata_object_delete_data(object);
 478         free(object);
 479 }
 480
 481 static FLAC__bool compare_block_data_streaminfo_(const FLAC__StreamMetadata_StreamInfo *block1, const FLAC__StreamMetadata_StreamInfo *block2)
 482 {
 483         if(block1->min_blocksize != block2->min_blocksize)
 484                 return false;
 485         if(block1->max_blocksize != block2->max_blocksize)
 486                 return false;
 487         if(block1->min_framesize != block2->min_framesize)
 488                 return false;
 489         if(block1->max_framesize != block2->max_framesize)
 490                 return false;
 491         if(block1->sample_rate != block2->sample_rate)
 492                 return false;
 493         if(block1->channels != block2->channels)
 494                 return false;
 495         if(block1->bits_per_sample != block2->bits_per_sample)
 496                 return false;
 497         if(block1->total_samples != block2->total_samples)
 498                 return false;
 499         if(0 != memcmp(block1->md5sum, block2->md5sum, 16))
 500                 return false;
 501         return true;
 502 }
 503
 504 static FLAC__bool compare_block_data_application_(const FLAC__StreamMetadata_Application *block1, const FLAC__StreamMetadata_Application *block2, unsigned block_length)
 505 {
 506         FLAC__ASSERT(0 != block1);
 507         FLAC__ASSERT(0 != block2);
 508         FLAC__ASSERT(block_length >= sizeof(block1->id));
 509
 510         if(0 != memcmp(block1->id, block2->id, sizeof(block1->id)))
 511                 return false;
 512         if(0 != block1->data && 0 != block2->data)
 513                 return 0 == memcmp(block1->data, block2->data, block_length - sizeof(block1->id));
 514         else
 515                 return block1->data == block2->data;
 516 }
 517
 518 static FLAC__bool compare_block_data_seektable_(const FLAC__StreamMetadata_SeekTable *block1, const FLAC__StreamMetadata_SeekTable *block2)
 519 {
 520         unsigned i;
 521
 522         FLAC__ASSERT(0 != block1);
 523         FLAC__ASSERT(0 != block2);
 524
 525         if(block1->num_points != block2->num_points)
 526                 return false;
 527
 528         if(0 != block1->points && 0 != block2->points) {
 529                 for(i = 0; i < block1->num_points; i++) {
 530                         if(block1->points[i].sample_number != block2->points[i].sample_number)
 531                                 return false;
 532                         if(block1->points[i].stream_offset != block2->points[i].stream_offset)
 533                                 return false;
 534                         if(block1->points[i].frame_samples != block2->points[i].frame_samples)
 535                                 return false;
 536                 }
 537                 return true;
 538         }
 539         else
 540                 return block1->points == block2->points;
 541 }
 542
 543 static FLAC__bool compare_block_data_vorbiscomment_(const FLAC__StreamMetadata_VorbisComment *block1, const FLAC__StreamMetadata_VorbisComment *block2)
 544 {
 545         unsigned i;
 546
 547         if(block1->vendor_string.length != block2->vendor_string.length)
 548                 return false;
 549
 550         if(0 != block1->vendor_string.entry && 0 != block2->vendor_string.entry) {
 551                 if(0 != memcmp(block1->vendor_string.entry, block2->vendor_string.entry, block1->vendor_string.length))
 552                         return false;
 553         }
 554         else if(block1->vendor_string.entry != block2->vendor_string.entry)
 555                 return false;
 556
 557         if(block1->num_comments != block2->num_comments)
 558                 return false;
 559
 560         for(i = 0; i < block1->num_comments; i++) {
 561                 if(0 != block1->comments[i].entry && 0 != block2->comments[i].entry) {
 562                         if(0 != memcmp(block1->comments[i].entry, block2->comments[i].entry, block1->comments[i].length))
 563                                 return false;
 564                 }
 565                 else if(block1->comments[i].entry != block2->comments[i].entry)
 566                         return false;
 567         }
 568         return true;
 569 }
 570
 571 static FLAC__bool compare_block_data_cuesheet_(const FLAC__StreamMetadata_CueSheet *block1, const FLAC__StreamMetadata_CueSheet *block2)
 572 {
 573         unsigned i, j;
 574
 575         if(0 != strcmp(block1->media_catalog_number, block2->media_catalog_number))
 576                 return false;
 577
 578         if(block1->lead_in != block2->lead_in)
 579                 return false;
 580
 581         if(block1->num_tracks != block2->num_tracks)
 582                 return false;
 583
 584         if(0 != block1->tracks && 0 != block2->tracks) {
 585                 FLAC__ASSERT(block1->num_tracks > 0);
 586                 for(i = 0; i < block1->num_tracks; i++) {
 587                         if(block1->tracks[i].offset != block2->tracks[i].offset)
 588                                 return false;
 589                         if(block1->tracks[i].number != block2->tracks[i].number)
 590                                 return false;
 591                         if(0 != memcmp(block1->tracks[i].isrc, block2->tracks[i].isrc, sizeof(block1->tracks[i].isrc)))
 592                                 return false;
 593                         if(block1->tracks[i].type != block2->tracks[i].type)
 594                                 return false;
 595                         if(block1->tracks[i].pre_emphasis != block2->tracks[i].pre_emphasis)
 596                                 return false;
 597                         if(block1->tracks[i].num_indices != block2->tracks[i].num_indices)
 598                                 return false;
 599                         if(0 != block1->tracks[i].indices && 0 != block2->tracks[i].indices) {
 600                                 FLAC__ASSERT(block1->tracks[i].num_indices > 0);
 601                                 for(j = 0; j < block1->tracks[i].num_indices; j++) {
 602                                         if(block1->tracks[i].indices[j].offset != block2->tracks[i].indices[j].offset)
 603                                                 return false;
 604                                         if(block1->tracks[i].indices[j].number != block2->tracks[i].indices[j].number)
 605                                                 return false;
 606                                 }
 607                         }
 608                         else if(block1->tracks[i].indices != block2->tracks[i].indices)
 609                                 return false;
 610                 }
 611         }
 612         else if(block1->tracks != block2->tracks)
 613                 return false;
 614         return true;
 615 }
 616
 617 FLAC_API FLAC__bool FLAC__metadata_object_is_equal(const FLAC__StreamMetadata *block1, const FLAC__StreamMetadata *block2)
 618 {
 619         FLAC__ASSERT(0 != block1);
 620         FLAC__ASSERT(0 != block2);
 621
 622         if(block1->type != block2->type) {
 623                 return false;
 624         }
 625         if(block1->is_last != block2->is_last) {
 626                 return false;
 627         }
 628         if(block1->length != block2->length) {
 629                 return false;
 630         }
 631         switch(block1->type) {
 632                 case FLAC__METADATA_TYPE_STREAMINFO:
 633                         return compare_block_data_streaminfo_(&block1->data.stream_info, &block2->data.stream_info);
 634                 case FLAC__METADATA_TYPE_PADDING:
 635                         return true; /* we don't compare the padding guts */
 636                 case FLAC__METADATA_TYPE_APPLICATION:
 637                         return compare_block_data_application_(&block1->data.application, &block2->data.application, block1->length);
 638                 case FLAC__METADATA_TYPE_SEEKTABLE:
 639                         return compare_block_data_seektable_(&block1->data.seek_table, &block2->data.seek_table);
 640                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 641                         return compare_block_data_vorbiscomment_(&block1->data.vorbis_comment, &block2->data.vorbis_comment);
 642                 case FLAC__METADATA_TYPE_CUESHEET:
 643                         return compare_block_data_cuesheet_(&block1->data.cue_sheet, &block2->data.cue_sheet);
 644                 default:
 645                         FLAC__ASSERT(0);
 646                         return false;
 647         }
 648 }
 649
 650 FLAC_API FLAC__bool FLAC__metadata_object_application_set_data(FLAC__StreamMetadata *object, FLAC__byte *data, unsigned length, FLAC__bool copy)
 651 {
 652         FLAC__byte *save;
 653
 654         FLAC__ASSERT(0 != object);
 655         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_APPLICATION);
 656         FLAC__ASSERT((0 != data && length > 0) || (0 == data && length == 0 && copy == false));
 657
 658         save = object->data.application.data;
 659
 660         /* do the copy first so that if we fail we leave the object untouched */
 661         if(copy) {
 662                 if(!copy_bytes_(&object->data.application.data, data, length))
 663                         return false;
 664         }
 665         else {
 666                 object->data.application.data = data;
 667         }
 668
 669         if(0 != save)
 670                 free(save);
 671
 672         object->length = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8 + length;
 673         return true;
 674 }
 675
 676 FLAC_API FLAC__bool FLAC__metadata_object_seektable_resize_points(FLAC__StreamMetadata *object, unsigned new_num_points)
 677 {
 678         FLAC__ASSERT(0 != object);
 679         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 680
 681         if(0 == object->data.seek_table.points) {
 682                 FLAC__ASSERT(object->data.seek_table.num_points == 0);
 683                 if(0 == new_num_points)
 684                         return true;
 685                 else if(0 == (object->data.seek_table.points = seekpoint_array_new_(new_num_points)))
 686                         return false;
 687         }
 688         else {
 689                 const unsigned old_size = object->data.seek_table.num_points * sizeof(FLAC__StreamMetadata_SeekPoint);
 690                 const unsigned new_size = new_num_points * sizeof(FLAC__StreamMetadata_SeekPoint);
 691
 692                 FLAC__ASSERT(object->data.seek_table.num_points > 0);
 693
 694                 if(new_size == 0) {
 695                         free(object->data.seek_table.points);
 696                         object->data.seek_table.points = 0;
 697                 }
 698                 else if(0 == (object->data.seek_table.points = (FLAC__StreamMetadata_SeekPoint*)realloc(object->data.seek_table.points, new_size)))
 699                         return false;
 700
 701                 /* if growing, set new elements to placeholders */
 702                 if(new_size > old_size) {
 703                         unsigned i;
 704                         for(i = object->data.seek_table.num_points; i < new_num_points; i++) {
 705                                 object->data.seek_table.points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
 706                                 object->data.seek_table.points[i].stream_offset = 0;
 707                                 object->data.seek_table.points[i].frame_samples = 0;
 708                         }
 709                 }
 710         }
 711
 712         object->data.seek_table.num_points = new_num_points;
 713
 714         seektable_calculate_length_(object);
 715         return true;
 716 }
 717
 718 FLAC_API void FLAC__metadata_object_seektable_set_point(FLAC__StreamMetadata *object, unsigned point_num, FLAC__StreamMetadata_SeekPoint point)
 719 {
 720         FLAC__ASSERT(0 != object);
 721         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 722         FLAC__ASSERT(point_num < object->data.seek_table.num_points);
 723
 724         object->data.seek_table.points[point_num] = point;
 725 }
 726
 727 FLAC_API FLAC__bool FLAC__metadata_object_seektable_insert_point(FLAC__StreamMetadata *object, unsigned point_num, FLAC__StreamMetadata_SeekPoint point)
 728 {
 729         int i;
 730
 731         FLAC__ASSERT(0 != object);
 732         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 733         FLAC__ASSERT(point_num <= object->data.seek_table.num_points);
 734
 735         if(!FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points+1))
 736                 return false;
 737
 738         /* move all points >= point_num forward one space */
 739         for(i = (int)object->data.seek_table.num_points-1; i > (int)point_num; i--)
 740                 object->data.seek_table.points[i] = object->data.seek_table.points[i-1];
 741
 742         FLAC__metadata_object_seektable_set_point(object, point_num, point);
 743         seektable_calculate_length_(object);
 744         return true;
 745 }
 746
 747 FLAC_API FLAC__bool FLAC__metadata_object_seektable_delete_point(FLAC__StreamMetadata *object, unsigned point_num)
 748 {
 749         unsigned i;
 750
 751         FLAC__ASSERT(0 != object);
 752         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 753         FLAC__ASSERT(point_num < object->data.seek_table.num_points);
 754
 755         /* move all points > point_num backward one space */
 756         for(i = point_num; i < object->data.seek_table.num_points-1; i++)
 757                 object->data.seek_table.points[i] = object->data.seek_table.points[i+1];
 758
 759         return FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points-1);
 760 }
 761
 762 FLAC_API FLAC__bool FLAC__metadata_object_seektable_is_legal(const FLAC__StreamMetadata *object)
 763 {
 764         FLAC__ASSERT(0 != object);
 765         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 766
 767         return FLAC__format_seektable_is_legal(&object->data.seek_table);
 768 }
 769
 770 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_placeholders(FLAC__StreamMetadata *object, unsigned num)
 771 {
 772         FLAC__ASSERT(0 != object);
 773         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 774
 775         if(num > 0)
 776                 /* WATCHOUT: we rely on the fact that growing the array adds PLACEHOLDERS at the end */
 777                 return FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points + num);
 778         else
 779                 return true;
 780 }
 781
 782 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_point(FLAC__StreamMetadata *object, FLAC__uint64 sample_number)
 783 {
 784         FLAC__StreamMetadata_SeekTable *seek_table;
 785
 786         FLAC__ASSERT(0 != object);
 787         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 788
 789         seek_table = &object->data.seek_table;
 790
 791         if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + 1))
 792                 return false;
 793
 794         seek_table->points[seek_table->num_points - 1].sample_number = sample_number;
 795         seek_table->points[seek_table->num_points - 1].stream_offset = 0;
 796         seek_table->points[seek_table->num_points - 1].frame_samples = 0;
 797
 798         return true;
 799 }
 800
 801 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_points(FLAC__StreamMetadata *object, FLAC__uint64 sample_numbers[], unsigned num)
 802 {
 803         FLAC__ASSERT(0 != object);
 804         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 805         FLAC__ASSERT(0 != sample_numbers || num == 0);
 806
 807         if(num > 0) {
 808                 FLAC__StreamMetadata_SeekTable *seek_table = &object->data.seek_table;
 809                 unsigned i, j;
 810
 811                 i = seek_table->num_points;
 812
 813                 if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + num))
 814                         return false;
 815
 816                 for(j = 0; j < num; i++, j++) {
 817                         seek_table->points[i].sample_number = sample_numbers[j];
 818                         seek_table->points[i].stream_offset = 0;
 819                         seek_table->points[i].frame_samples = 0;
 820                 }
 821         }
 822
 823         return true;
 824 }
 825
 826 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_spaced_points(FLAC__StreamMetadata *object, unsigned num, FLAC__uint64 total_samples)
 827 {
 828         FLAC__ASSERT(0 != object);
 829         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 830         FLAC__ASSERT(total_samples > 0);
 831
 832         if(num > 0) {
 833                 FLAC__StreamMetadata_SeekTable *seek_table = &object->data.seek_table;
 834                 unsigned i, j;
 835
 836                 i = seek_table->num_points;
 837
 838                 if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + num))
 839                         return false;
 840
 841                 for(j = 0; j < num; i++, j++) {
 842                         seek_table->points[i].sample_number = total_samples * (FLAC__uint64)j / (FLAC__uint64)num;
 843                         seek_table->points[i].stream_offset = 0;
 844                         seek_table->points[i].frame_samples = 0;
 845                 }
 846         }
 847
 848         return true;
 849 }
 850
 851 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_sort(FLAC__StreamMetadata *object, FLAC__bool compact)
 852 {
 853         unsigned unique;
 854
 855         FLAC__ASSERT(0 != object);
 856         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 857
 858         unique = FLAC__format_seektable_sort(&object->data.seek_table);
 859
 860         return !compact || FLAC__metadata_object_seektable_resize_points(object, unique);
 861 }
 862
 863 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_vendor_string(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
 864 {
 865         return vorbiscomment_set_entry_(object, &object->data.vorbis_comment.vendor_string, &entry, copy);
 866 }
 867
 868 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_resize_comments(FLAC__StreamMetadata *object, unsigned new_num_comments)
 869 {
 870         FLAC__ASSERT(0 != object);
 871         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 872
 873         if(0 == object->data.vorbis_comment.comments) {
 874                 FLAC__ASSERT(object->data.vorbis_comment.num_comments == 0);
 875                 if(0 == new_num_comments)
 876                         return true;
 877                 else if(0 == (object->data.vorbis_comment.comments = vorbiscomment_entry_array_new_(new_num_comments)))
 878                         return false;
 879         }
 880         else {
 881                 const unsigned old_size = object->data.vorbis_comment.num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry);
 882                 const unsigned new_size = new_num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry);
 883
 884                 FLAC__ASSERT(object->data.vorbis_comment.num_comments > 0);
 885
 886                 /* if shrinking, free the truncated entries */
 887                 if(new_num_comments < object->data.vorbis_comment.num_comments) {
 888                         unsigned i;
 889                         for(i = new_num_comments; i < object->data.vorbis_comment.num_comments; i++)
 890                                 if(0 != object->data.vorbis_comment.comments[i].entry)
 891                                         free(object->data.vorbis_comment.comments[i].entry);
 892                 }
 893
 894                 if(new_size == 0) {
 895                         free(object->data.vorbis_comment.comments);
 896                         object->data.vorbis_comment.comments = 0;
 897                 }
 898                 else if(0 == (object->data.vorbis_comment.comments = (FLAC__StreamMetadata_VorbisComment_Entry*)realloc(object->data.vorbis_comment.comments, new_size)))
 899                         return false;
 900
 901                 /* if growing, zero all the length/pointers of new elements */
 902                 if(new_size > old_size)
 903                         memset(object->data.vorbis_comment.comments + object->data.vorbis_comment.num_comments, 0, new_size - old_size);
 904         }
 905
 906         object->data.vorbis_comment.num_comments = new_num_comments;
 907
 908         vorbiscomment_calculate_length_(object);
 909         return true;
 910 }
 911
 912 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_comment(FLAC__StreamMetadata *object, unsigned comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
 913 {
 914         return vorbiscomment_set_entry_(object, &object->data.vorbis_comment.comments[comment_num], &entry, copy);
 915 }
 916
 917 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_insert_comment(FLAC__StreamMetadata *object, unsigned comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
 918 {
 919         FLAC__StreamMetadata_VorbisComment *vc;
 920
 921         FLAC__ASSERT(0 != object);
 922         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 923         FLAC__ASSERT(comment_num <= object->data.vorbis_comment.num_comments);
 924
 925         vc = &object->data.vorbis_comment;
 926
 927         if(!FLAC__metadata_object_vorbiscomment_resize_comments(object, vc->num_comments+1))
 928                 return false;
 929
 930         /* move all comments >= comment_num forward one space */
 931         memmove(&vc->comments[comment_num+1], &vc->comments[comment_num], sizeof(FLAC__StreamMetadata_VorbisComment_Entry)*(vc->num_comments-1-comment_num));
 932         vc->comments[comment_num].length = 0;
 933         vc->comments[comment_num].entry = 0;
 934
 935         return FLAC__metadata_object_vorbiscomment_set_comment(object, comment_num, entry, copy);
 936 }
 937
 938 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_delete_comment(FLAC__StreamMetadata *object, unsigned comment_num)
 939 {
 940         FLAC__StreamMetadata_VorbisComment *vc;
 941
 942         FLAC__ASSERT(0 != object);
 943         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 944         FLAC__ASSERT(comment_num < object->data.vorbis_comment.num_comments);
 945
 946         vc = &object->data.vorbis_comment;
 947
 948         /* free the comment at comment_num */
 949         if(0 != vc->comments[comment_num].entry)
 950                 free(vc->comments[comment_num].entry);
 951
 952         /* move all comments > comment_num backward one space */
 953         memmove(&vc->comments[comment_num], &vc->comments[comment_num+1], sizeof(FLAC__StreamMetadata_VorbisComment_Entry)*(vc->num_comments-comment_num-1));
 954         vc->comments[vc->num_comments-1].length = 0;
 955         vc->comments[vc->num_comments-1].entry = 0;
 956
 957         return FLAC__metadata_object_vorbiscomment_resize_comments(object, vc->num_comments-1);
 958 }
 959
 960 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_matches(const FLAC__StreamMetadata_VorbisComment_Entry *entry, const char *field_name, unsigned field_name_length)
 961 {
 962         const FLAC__byte *eq = (FLAC__byte*)memchr(entry->entry, '=', entry->length);
 963 #if defined _MSC_VER || defined __MINGW32__
 964 #define FLAC__STRNCASECMP strnicmp
 965 #else
 966 #define FLAC__STRNCASECMP strncasecmp
 967 #endif
 968         return (0 != eq && (unsigned)(eq-entry->entry) == field_name_length && 0 == FLAC__STRNCASECMP(field_name, (const char *)entry->entry, field_name_length));
 969 #undef FLAC__STRNCASECMP
 970 }
 971
 972 FLAC_API int FLAC__metadata_object_vorbiscomment_find_entry_from(const FLAC__StreamMetadata *object, unsigned offset, const char *field_name)
 973 {
 974         const unsigned field_name_length = strlen(field_name);
 975         unsigned i;
 976
 977         FLAC__ASSERT(0 != object);
 978         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 979
 980         for(i = offset; i < object->data.vorbis_comment.num_comments; i++) {
 981                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments + i, field_name, field_name_length))
 982                         return (int)i;
 983         }
 984
 985         return -1;
 986 }
 987
 988 FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entry_matching(FLAC__StreamMetadata *object, const char *field_name)
 989 {
 990         const unsigned field_name_length = strlen(field_name);
 991         unsigned i;
 992
 993         FLAC__ASSERT(0 != object);
 994         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 995
 996         for(i = 0; i < object->data.vorbis_comment.num_comments; i++) {
 997                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments + i, field_name, field_name_length)) {
 998                         if(!FLAC__metadata_object_vorbiscomment_delete_comment(object, i))
 999                                 return -1;
1000                         else
1001                                 return 1;
1002                 }
1003         }
1004
1005         return 0;
1006 }
1007
1008 FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entries_matching(FLAC__StreamMetadata *object, const char *field_name)
1009 {
1010         FLAC__bool ok = true;
1011         unsigned matching = 0;
1012         const unsigned field_name_length = strlen(field_name);
1013         int i;
1014
1015         FLAC__ASSERT(0 != object);
1016         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1017
1018         /* must delete from end to start otherwise it will interfere with our iteration */
1019         for(i = (int)object->data.vorbis_comment.num_comments - 1; ok && i >= 0; i--) {
1020                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments + i, field_name, field_name_length)) {
1021                         matching++;
1022                         ok &= FLAC__metadata_object_vorbiscomment_delete_comment(object, (unsigned)i);
1023                 }
1024         }
1025
1026         return ok? (int)matching : -1;
1027 }
1028
1029 FLAC_API FLAC__StreamMetadata_CueSheet_Track *FLAC__metadata_object_cuesheet_track_new()
1030 {
1031         return (FLAC__StreamMetadata_CueSheet_Track*)calloc(1, sizeof(FLAC__StreamMetadata_CueSheet_Track));
1032 }
1033
1034 FLAC_API FLAC__StreamMetadata_CueSheet_Track *FLAC__metadata_object_cuesheet_track_clone(const FLAC__StreamMetadata_CueSheet_Track *object)
1035 {
1036         FLAC__StreamMetadata_CueSheet_Track *to;
1037
1038         FLAC__ASSERT(0 != object);
1039
1040         if(0 != (to = FLAC__metadata_object_cuesheet_track_new())) {
1041                 if(!copy_track_(to, object)) {
1042                         FLAC__metadata_object_cuesheet_track_delete(to);
1043                         return 0;
1044                 }
1045         }
1046
1047         return to;
1048 }
1049
1050 void FLAC__metadata_object_cuesheet_track_delete_data(FLAC__StreamMetadata_CueSheet_Track *object)
1051 {
1052         FLAC__ASSERT(0 != object);
1053
1054         if(0 != object->indices) {
1055                 FLAC__ASSERT(object->num_indices > 0);
1056                 free(object->indices);
1057         }
1058 }
1059
1060 FLAC_API void FLAC__metadata_object_cuesheet_track_delete(FLAC__StreamMetadata_CueSheet_Track *object)
1061 {
1062         FLAC__metadata_object_cuesheet_track_delete_data(object);
1063         free(object);
1064 }
1065
1066 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_resize_indices(FLAC__StreamMetadata *object, unsigned track_num, unsigned new_num_indices)
1067 {
1068         FLAC__StreamMetadata_CueSheet_Track *track;
1069         FLAC__ASSERT(0 != object);
1070         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1071         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1072
1073         track = &object->data.cue_sheet.tracks[track_num];
1074
1075         if(0 == track->indices) {
1076                 FLAC__ASSERT(track->num_indices == 0);
1077                 if(0 == new_num_indices)
1078                         return true;
1079                 else if(0 == (track->indices = cuesheet_track_index_array_new_(new_num_indices)))
1080                         return false;
1081         }
1082         else {
1083                 const unsigned old_size = track->num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index);
1084                 const unsigned new_size = new_num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index);
1085
1086                 FLAC__ASSERT(track->num_indices > 0);
1087
1088                 if(new_size == 0) {
1089                         free(track->indices);
1090                         track->indices = 0;
1091                 }
1092                 else if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)realloc(track->indices, new_size)))
1093                         return false;
1094
1095                 /* if growing, zero all the lengths/pointers of new elements */
1096                 if(new_size > old_size)
1097                         memset(track->indices + track->num_indices, 0, new_size - old_size);
1098         }
1099
1100         track->num_indices = new_num_indices;
1101
1102         cuesheet_calculate_length_(object);
1103         return true;
1104 }
1105
1106 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_insert_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num, FLAC__StreamMetadata_CueSheet_Index index)
1107 {
1108         FLAC__StreamMetadata_CueSheet_Track *track;
1109
1110         FLAC__ASSERT(0 != object);
1111         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1112         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1113         FLAC__ASSERT(index_num <= object->data.cue_sheet.tracks[track_num].num_indices);
1114
1115         track = &object->data.cue_sheet.tracks[track_num];
1116
1117         if(!FLAC__metadata_object_cuesheet_track_resize_indices(object, track_num, track->num_indices+1))
1118                 return false;
1119
1120         /* move all indices >= index_num forward one space */
1121         memmove(&track->indices[index_num+1], &track->indices[index_num], sizeof(FLAC__StreamMetadata_CueSheet_Index)*(track->num_indices-1-index_num));
1122
1123         track->indices[index_num] = index;
1124         cuesheet_calculate_length_(object);
1125         return true;
1126 }
1127
1128 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_insert_blank_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num)
1129 {
1130         FLAC__StreamMetadata_CueSheet_Index index;
1131         memset(&index, 0, sizeof(index));
1132         return FLAC__metadata_object_cuesheet_track_index_index(object, track_num, index_num, &index);
1133 }
1134
1135 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_delete_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num)
1136 {
1137         FLAC__StreamMetadata_CueSheet_Track *track;
1138
1139         FLAC__ASSERT(0 != object);
1140         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1141         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1142         FLAC__ASSERT(index_num < object->data.cue_sheet.tracks[track_num].num_indices);
1143
1144         track = &object->data.cue_sheet.tracks[track_num];
1145
1146         /* move all indices > index_num backward one space */
1147         memmove(&track->indices[index_num], &track->indices[index_num+1], sizeof(FLAC__StreamMetadata_CueSheet_Track)*(track->num_indices-index_num-1));
1148
1149         FLAC__metadata_object_cuesheet_track_resize_indices(object, track_num, track->num_indices-1);
1150         cuesheet_calculate_length_(object);
1151         return true;
1152 }
1153
1154 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_resize_tracks(FLAC__StreamMetadata *object, unsigned new_num_tracks)
1155 {
1156         FLAC__ASSERT(0 != object);
1157         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1158
1159         if(0 == object->data.cue_sheet.tracks) {
1160                 FLAC__ASSERT(object->data.cue_sheet.num_tracks == 0);
1161                 if(0 == new_num_tracks)
1162                         return true;
1163                 else if(0 == (object->data.cue_sheet.tracks = cuesheet_track_array_new_(new_num_tracks)))
1164                         return false;
1165         }
1166         else {
1167                 const unsigned old_size = object->data.cue_sheet.num_tracks * sizeof(FLAC__StreamMetadata_CueSheet_Track);
1168                 const unsigned new_size = new_num_tracks * sizeof(FLAC__StreamMetadata_CueSheet_Track);
1169
1170                 FLAC__ASSERT(object->data.cue_sheet.num_tracks > 0);
1171
1172                 /* if shrinking, free the truncated entries */
1173                 if(new_num_tracks < object->data.cue_sheet.num_tracks) {
1174                         unsigned i;
1175                         for(i = new_num_tracks; i < object->data.cue_sheet.num_tracks; i++)
1176                                 if(0 != object->data.cue_sheet.tracks[i].indices)
1177                                         free(object->data.cue_sheet.tracks[i].indices);
1178                 }
1179
1180                 if(new_size == 0) {
1181                         free(object->data.cue_sheet.tracks);
1182                         object->data.cue_sheet.tracks = 0;
1183                 }
1184                 else if(0 == (object->data.cue_sheet.tracks = (FLAC__StreamMetadata_CueSheet_Track*)realloc(object->data.cue_sheet.tracks, new_size)))
1185                         return false;
1186
1187                 /* if growing, zero all the lengths/pointers of new elements */
1188                 if(new_size > old_size)
1189                         memset(object->data.cue_sheet.tracks + object->data.cue_sheet.num_tracks, 0, new_size - old_size);
1190         }
1191
1192         object->data.cue_sheet.num_tracks = new_num_tracks;
1193
1194         cuesheet_calculate_length_(object);
1195         return true;
1196 }
1197
1198 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_set_track(FLAC__StreamMetadata *object, unsigned track_num, FLAC__StreamMetadata_CueSheet_Track *track, FLAC__bool copy)
1199 {
1200         return cuesheet_set_track_(object, object->data.cue_sheet.tracks + track_num, track, copy);
1201 }
1202
1203 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_insert_track(FLAC__StreamMetadata *object, unsigned track_num, FLAC__StreamMetadata_CueSheet_Track *track, FLAC__bool copy)
1204 {
1205         FLAC__StreamMetadata_CueSheet *cs;
1206
1207         FLAC__ASSERT(0 != object);
1208         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1209         FLAC__ASSERT(track_num <= object->data.cue_sheet.num_tracks);
1210
1211         cs = &object->data.cue_sheet;
1212
1213         if(!FLAC__metadata_object_cuesheet_resize_tracks(object, cs->num_tracks+1))
1214                 return false;
1215
1216         /* move all tracks >= track_num forward one space */
1217         memmove(&cs->tracks[track_num+1], &cs->tracks[track_num], sizeof(FLAC__StreamMetadata_CueSheet_Track)*(cs->num_tracks-1-track_num));
1218         cs->tracks[track_num].num_indices = 0;
1219         cs->tracks[track_num].indices = 0;
1220
1221         return FLAC__metadata_object_cuesheet_set_track(object, track_num, track, copy);
1222 }
1223
1224 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_insert_blank_track(FLAC__StreamMetadata *object, unsigned track_num)
1225 {
1226         FLAC__StreamMetadata_CueSheet_Track track;
1227         memset(&track, 0, sizeof(track));
1228         return FLAC__metadata_object_cuesheet_insert_track(object, track_num, &track, /*copy=*/false);
1229 }
1230
1231 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_delete_track(FLAC__StreamMetadata *object, unsigned track_num)
1232 {
1233         FLAC__StreamMetadata_CueSheet *cs;
1234
1235         FLAC__ASSERT(0 != object);
1236         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1237         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1238
1239         cs = &object->data.cue_sheet;
1240
1241         /* free the track at track_num */
1242         if(0 != cs->tracks[track_num].indices)
1243                 free(cs->tracks[track_num].indices);
1244
1245         /* move all tracks > track_num backward one space */
1246         memmove(&cs->tracks[track_num], &cs->tracks[track_num+1], sizeof(FLAC__StreamMetadata_CueSheet_Track)*(cs->num_tracks-track_num-1));
1247         cs->tracks[cs->num_tracks-1].num_indices = 0;
1248         cs->tracks[cs->num_tracks-1].indices = 0;
1249
1250         return FLAC__metadata_object_cuesheet_resize_tracks(object, cs->num_tracks-1);
1251 }
1252
1253 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_is_legal(const FLAC__StreamMetadata *object, FLAC__bool check_cd_da_subset, const char **violation)
1254 {
1255         FLAC__ASSERT(0 != object);
1256         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1257
1258         return FLAC__format_cuesheet_is_legal(&object->data.cue_sheet, check_cd_da_subset, violation);
1259 }