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_IS_CD_LEN +
 211                 FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN +
 212                 FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN
 213         ) / 8;
 214
 215         object->length += object->data.cue_sheet.num_tracks * (
 216                 FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN +
 217                 FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN +
 218                 FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN +
 219                 FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN +
 220                 FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN +
 221                 FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN +
 222                 FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN
 223         ) / 8;
 224
 225         for(i = 0; i < object->data.cue_sheet.num_tracks; i++) {
 226                 object->length += object->data.cue_sheet.tracks[i].num_indices * (
 227                         FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN +
 228                         FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN +
 229                         FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN
 230                 ) / 8;
 231         }
 232 }
 233
 234 static FLAC__StreamMetadata_CueSheet_Index *cuesheet_track_index_array_new_(unsigned num_indices)
 235 {
 236         FLAC__ASSERT(num_indices > 0);
 237
 238         return (FLAC__StreamMetadata_CueSheet_Index*)calloc(num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index));
 239 }
 240
 241 static FLAC__StreamMetadata_CueSheet_Track *cuesheet_track_array_new_(unsigned num_tracks)
 242 {
 243         FLAC__ASSERT(num_tracks > 0);
 244
 245         return (FLAC__StreamMetadata_CueSheet_Track*)calloc(num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track));
 246 }
 247
 248 static void cuesheet_track_array_delete_(FLAC__StreamMetadata_CueSheet_Track *object_array, unsigned num_tracks)
 249 {
 250         unsigned i;
 251
 252         FLAC__ASSERT(0 != object_array && num_tracks > 0);
 253
 254         for(i = 0; i < num_tracks; i++) {
 255                 if(0 != object_array[i].indices) {
 256                         FLAC__ASSERT(object_array[i].num_indices > 0);
 257                         free(object_array[i].indices);
 258                 }
 259         }
 260
 261         if(0 != object_array)
 262                 free(object_array);
 263 }
 264
 265 static FLAC__StreamMetadata_CueSheet_Track *cuesheet_track_array_copy_(const FLAC__StreamMetadata_CueSheet_Track *object_array, unsigned num_tracks)
 266 {
 267         FLAC__StreamMetadata_CueSheet_Track *return_array;
 268
 269         FLAC__ASSERT(0 != object_array);
 270         FLAC__ASSERT(num_tracks > 0);
 271
 272         return_array = cuesheet_track_array_new_(num_tracks);
 273
 274         if(0 != return_array) {
 275                 unsigned i;
 276
 277                 for(i = 0; i < num_tracks; i++) {
 278                         if(!copy_track_(return_array+i, object_array+i)) {
 279                                 cuesheet_track_array_delete_(return_array, num_tracks);
 280                                 return 0;
 281                         }
 282                 }
 283         }
 284
 285         return return_array;
 286 }
 287
 288 static FLAC__bool cuesheet_set_track_(FLAC__StreamMetadata *object, FLAC__StreamMetadata_CueSheet_Track *dest, const FLAC__StreamMetadata_CueSheet_Track *src, FLAC__bool copy)
 289 {
 290         FLAC__StreamMetadata_CueSheet_Index *save;
 291
 292         FLAC__ASSERT(0 != object);
 293         FLAC__ASSERT(0 != dest);
 294         FLAC__ASSERT(0 != src);
 295         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
 296         FLAC__ASSERT((0 != src->indices && src->num_indices > 0) || (0 == src->indices && src->num_indices == 0));
 297         /*@@@@ for docs, note that there is no "&& copy == false" at the end here ^^^ which will filter up */
 298
 299         save = dest->indices;
 300
 301         /* do the copy first so that if we fail we leave the object untouched */
 302         if(copy) {
 303                 if(!copy_track_(dest, src))
 304                         return false;
 305         }
 306         else {
 307                 *dest = *src;
 308         }
 309
 310         if(0 != save)
 311                 free(save);
 312
 313         cuesheet_calculate_length_(object);
 314         return true;
 315 }
 316
 317
 318 /****************************************************************************
 319  *
 320  * Metadata object routines
 321  *
 322  ***************************************************************************/
 323
 324 FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_new(FLAC__MetadataType type)
 325 {
 326         FLAC__StreamMetadata *object = (FLAC__StreamMetadata*)calloc(1, sizeof(FLAC__StreamMetadata));
 327         if(0 != object) {
 328                 object->is_last = false;
 329                 object->type = type;
 330                 switch(type) {
 331                         case FLAC__METADATA_TYPE_STREAMINFO:
 332                                 object->length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
 333                                 break;
 334                         case FLAC__METADATA_TYPE_PADDING:
 335                                 break;
 336                         case FLAC__METADATA_TYPE_APPLICATION:
 337                                 object->length = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
 338                                 break;
 339                         case FLAC__METADATA_TYPE_SEEKTABLE:
 340                                 break;
 341                         case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 342                                 {
 343                                         object->data.vorbis_comment.vendor_string.length = (unsigned)strlen(FLAC__VENDOR_STRING);
 344                                         if(!copy_bytes_(&object->data.vorbis_comment.vendor_string.entry, (const FLAC__byte*)FLAC__VENDOR_STRING, object->data.vorbis_comment.vendor_string.length)) {
 345                                                 free(object);
 346                                                 return 0;
 347                                         }
 348                                         vorbiscomment_calculate_length_(object);
 349                                 }
 350                                 break;
 351                         case FLAC__METADATA_TYPE_CUESHEET:
 352                                 cuesheet_calculate_length_(object);
 353                                 break;
 354                         default:
 355                                 /* double protection: */
 356                                 FLAC__ASSERT(0);
 357                                 free(object);
 358                                 return 0;
 359                 }
 360         }
 361
 362         return object;
 363 }
 364
 365 FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_clone(const FLAC__StreamMetadata *object)
 366 {
 367         FLAC__StreamMetadata *to;
 368
 369         FLAC__ASSERT(0 != object);
 370
 371         if(0 != (to = FLAC__metadata_object_new(object->type))) {
 372                 to->is_last = object->is_last;
 373                 to->type = object->type;
 374                 to->length = object->length;
 375                 switch(to->type) {
 376                         case FLAC__METADATA_TYPE_STREAMINFO:
 377                                 memcpy(&to->data.stream_info, &object->data.stream_info, sizeof(FLAC__StreamMetadata_StreamInfo));
 378                                 break;
 379                         case FLAC__METADATA_TYPE_PADDING:
 380                                 break;
 381                         case FLAC__METADATA_TYPE_APPLICATION:
 382                                 memcpy(&to->data.application.id, &object->data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8);
 383                                 if(!copy_bytes_(&to->data.application.data, object->data.application.data, object->length - FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8)) {
 384                                         FLAC__metadata_object_delete(to);
 385                                         return 0;
 386                                 }
 387                                 break;
 388                         case FLAC__METADATA_TYPE_SEEKTABLE:
 389                                 to->data.seek_table.num_points = object->data.seek_table.num_points;
 390                                 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))) {
 391                                         FLAC__metadata_object_delete(to);
 392                                         return 0;
 393                                 }
 394                                 break;
 395                         case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 396                                 if(0 != to->data.vorbis_comment.vendor_string.entry) {
 397                                         free(to->data.vorbis_comment.vendor_string.entry);
 398                                         to->data.vorbis_comment.vendor_string.entry = 0;
 399                                 }
 400                                 if(!copy_vcentry_(&to->data.vorbis_comment.vendor_string, &object->data.vorbis_comment.vendor_string)) {
 401                                         FLAC__metadata_object_delete(to);
 402                                         return 0;
 403                                 }
 404                                 if(object->data.vorbis_comment.num_comments == 0) {
 405                                         FLAC__ASSERT(0 == object->data.vorbis_comment.comments);
 406                                         to->data.vorbis_comment.comments = 0;
 407                                 }
 408                                 else {
 409                                         FLAC__ASSERT(0 != object->data.vorbis_comment.comments);
 410                                         to->data.vorbis_comment.comments = vorbiscomment_entry_array_copy_(object->data.vorbis_comment.comments, object->data.vorbis_comment.num_comments);
 411                                         if(0 == to->data.vorbis_comment.comments) {
 412                                                 FLAC__metadata_object_delete(to);
 413                                                 return 0;
 414                                         }
 415                                 }
 416                                 to->data.vorbis_comment.num_comments = object->data.vorbis_comment.num_comments;
 417                                 break;
 418                         case FLAC__METADATA_TYPE_CUESHEET:
 419                                 memcpy(&to->data.cue_sheet, &object->data.cue_sheet, sizeof(FLAC__StreamMetadata_CueSheet));
 420                                 if(object->data.cue_sheet.num_tracks == 0) {
 421                                         FLAC__ASSERT(0 == object->data.cue_sheet.tracks);
 422                                 }
 423                                 else {
 424                                         FLAC__ASSERT(0 != object->data.cue_sheet.tracks);
 425                                         to->data.cue_sheet.tracks = cuesheet_track_array_copy_(object->data.cue_sheet.tracks, object->data.cue_sheet.num_tracks);
 426                                         if(0 == to->data.cue_sheet.tracks) {
 427                                                 FLAC__metadata_object_delete(to);
 428                                                 return 0;
 429                                         }
 430                                 }
 431                                 break;
 432                         default:
 433                                 /* double protection: */
 434                                 FLAC__ASSERT(0);
 435                                 free(to);
 436                                 return 0;
 437                 }
 438         }
 439
 440         return to;
 441 }
 442
 443 void FLAC__metadata_object_delete_data(FLAC__StreamMetadata *object)
 444 {
 445         FLAC__ASSERT(0 != object);
 446
 447         switch(object->type) {
 448                 case FLAC__METADATA_TYPE_STREAMINFO:
 449                 case FLAC__METADATA_TYPE_PADDING:
 450                         break;
 451                 case FLAC__METADATA_TYPE_APPLICATION:
 452                         if(0 != object->data.application.data) {
 453                                 free(object->data.application.data);
 454                                 object->data.application.data = 0;
 455                         }
 456                         break;
 457                 case FLAC__METADATA_TYPE_SEEKTABLE:
 458                         if(0 != object->data.seek_table.points) {
 459                                 free(object->data.seek_table.points);
 460                                 object->data.seek_table.points = 0;
 461                         }
 462                         break;
 463                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 464                         if(0 != object->data.vorbis_comment.vendor_string.entry) {
 465                                 free(object->data.vorbis_comment.vendor_string.entry);
 466                                 object->data.vorbis_comment.vendor_string.entry = 0;
 467                         }
 468                         if(0 != object->data.vorbis_comment.comments) {
 469                                 FLAC__ASSERT(object->data.vorbis_comment.num_comments > 0);
 470                                 vorbiscomment_entry_array_delete_(object->data.vorbis_comment.comments, object->data.vorbis_comment.num_comments);
 471                         }
 472                         break;
 473                 case FLAC__METADATA_TYPE_CUESHEET:
 474                         if(0 != object->data.cue_sheet.tracks) {
 475                                 FLAC__ASSERT(object->data.cue_sheet.num_tracks > 0);
 476                                 cuesheet_track_array_delete_(object->data.cue_sheet.tracks, object->data.cue_sheet.num_tracks);
 477                         }
 478                         break;
 479                 default:
 480                         FLAC__ASSERT(0);
 481         }
 482 }
 483
 484 FLAC_API void FLAC__metadata_object_delete(FLAC__StreamMetadata *object)
 485 {
 486         FLAC__metadata_object_delete_data(object);
 487         free(object);
 488 }
 489
 490 static FLAC__bool compare_block_data_streaminfo_(const FLAC__StreamMetadata_StreamInfo *block1, const FLAC__StreamMetadata_StreamInfo *block2)
 491 {
 492         if(block1->min_blocksize != block2->min_blocksize)
 493                 return false;
 494         if(block1->max_blocksize != block2->max_blocksize)
 495                 return false;
 496         if(block1->min_framesize != block2->min_framesize)
 497                 return false;
 498         if(block1->max_framesize != block2->max_framesize)
 499                 return false;
 500         if(block1->sample_rate != block2->sample_rate)
 501                 return false;
 502         if(block1->channels != block2->channels)
 503                 return false;
 504         if(block1->bits_per_sample != block2->bits_per_sample)
 505                 return false;
 506         if(block1->total_samples != block2->total_samples)
 507                 return false;
 508         if(0 != memcmp(block1->md5sum, block2->md5sum, 16))
 509                 return false;
 510         return true;
 511 }
 512
 513 static FLAC__bool compare_block_data_application_(const FLAC__StreamMetadata_Application *block1, const FLAC__StreamMetadata_Application *block2, unsigned block_length)
 514 {
 515         FLAC__ASSERT(0 != block1);
 516         FLAC__ASSERT(0 != block2);
 517         FLAC__ASSERT(block_length >= sizeof(block1->id));
 518
 519         if(0 != memcmp(block1->id, block2->id, sizeof(block1->id)))
 520                 return false;
 521         if(0 != block1->data && 0 != block2->data)
 522                 return 0 == memcmp(block1->data, block2->data, block_length - sizeof(block1->id));
 523         else
 524                 return block1->data == block2->data;
 525 }
 526
 527 static FLAC__bool compare_block_data_seektable_(const FLAC__StreamMetadata_SeekTable *block1, const FLAC__StreamMetadata_SeekTable *block2)
 528 {
 529         unsigned i;
 530
 531         FLAC__ASSERT(0 != block1);
 532         FLAC__ASSERT(0 != block2);
 533
 534         if(block1->num_points != block2->num_points)
 535                 return false;
 536
 537         if(0 != block1->points && 0 != block2->points) {
 538                 for(i = 0; i < block1->num_points; i++) {
 539                         if(block1->points[i].sample_number != block2->points[i].sample_number)
 540                                 return false;
 541                         if(block1->points[i].stream_offset != block2->points[i].stream_offset)
 542                                 return false;
 543                         if(block1->points[i].frame_samples != block2->points[i].frame_samples)
 544                                 return false;
 545                 }
 546                 return true;
 547         }
 548         else
 549                 return block1->points == block2->points;
 550 }
 551
 552 static FLAC__bool compare_block_data_vorbiscomment_(const FLAC__StreamMetadata_VorbisComment *block1, const FLAC__StreamMetadata_VorbisComment *block2)
 553 {
 554         unsigned i;
 555
 556         if(block1->vendor_string.length != block2->vendor_string.length)
 557                 return false;
 558
 559         if(0 != block1->vendor_string.entry && 0 != block2->vendor_string.entry) {
 560                 if(0 != memcmp(block1->vendor_string.entry, block2->vendor_string.entry, block1->vendor_string.length))
 561                         return false;
 562         }
 563         else if(block1->vendor_string.entry != block2->vendor_string.entry)
 564                 return false;
 565
 566         if(block1->num_comments != block2->num_comments)
 567                 return false;
 568
 569         for(i = 0; i < block1->num_comments; i++) {
 570                 if(0 != block1->comments[i].entry && 0 != block2->comments[i].entry) {
 571                         if(0 != memcmp(block1->comments[i].entry, block2->comments[i].entry, block1->comments[i].length))
 572                                 return false;
 573                 }
 574                 else if(block1->comments[i].entry != block2->comments[i].entry)
 575                         return false;
 576         }
 577         return true;
 578 }
 579
 580 static FLAC__bool compare_block_data_cuesheet_(const FLAC__StreamMetadata_CueSheet *block1, const FLAC__StreamMetadata_CueSheet *block2)
 581 {
 582         unsigned i, j;
 583
 584         if(0 != strcmp(block1->media_catalog_number, block2->media_catalog_number))
 585                 return false;
 586
 587         if(block1->lead_in != block2->lead_in)
 588                 return false;
 589
 590         if(block1->is_cd != block2->is_cd)
 591                 return false;
 592
 593         if(block1->num_tracks != block2->num_tracks)
 594                 return false;
 595
 596         if(0 != block1->tracks && 0 != block2->tracks) {
 597                 FLAC__ASSERT(block1->num_tracks > 0);
 598                 for(i = 0; i < block1->num_tracks; i++) {
 599                         if(block1->tracks[i].offset != block2->tracks[i].offset)
 600                                 return false;
 601                         if(block1->tracks[i].number != block2->tracks[i].number)
 602                                 return false;
 603                         if(0 != memcmp(block1->tracks[i].isrc, block2->tracks[i].isrc, sizeof(block1->tracks[i].isrc)))
 604                                 return false;
 605                         if(block1->tracks[i].type != block2->tracks[i].type)
 606                                 return false;
 607                         if(block1->tracks[i].pre_emphasis != block2->tracks[i].pre_emphasis)
 608                                 return false;
 609                         if(block1->tracks[i].num_indices != block2->tracks[i].num_indices)
 610                                 return false;
 611                         if(0 != block1->tracks[i].indices && 0 != block2->tracks[i].indices) {
 612                                 FLAC__ASSERT(block1->tracks[i].num_indices > 0);
 613                                 for(j = 0; j < block1->tracks[i].num_indices; j++) {
 614                                         if(block1->tracks[i].indices[j].offset != block2->tracks[i].indices[j].offset)
 615                                                 return false;
 616                                         if(block1->tracks[i].indices[j].number != block2->tracks[i].indices[j].number)
 617                                                 return false;
 618                                 }
 619                         }
 620                         else if(block1->tracks[i].indices != block2->tracks[i].indices)
 621                                 return false;
 622                 }
 623         }
 624         else if(block1->tracks != block2->tracks)
 625                 return false;
 626         return true;
 627 }
 628
 629 FLAC_API FLAC__bool FLAC__metadata_object_is_equal(const FLAC__StreamMetadata *block1, const FLAC__StreamMetadata *block2)
 630 {
 631         FLAC__ASSERT(0 != block1);
 632         FLAC__ASSERT(0 != block2);
 633
 634         if(block1->type != block2->type) {
 635                 return false;
 636         }
 637         if(block1->is_last != block2->is_last) {
 638                 return false;
 639         }
 640         if(block1->length != block2->length) {
 641                 return false;
 642         }
 643         switch(block1->type) {
 644                 case FLAC__METADATA_TYPE_STREAMINFO:
 645                         return compare_block_data_streaminfo_(&block1->data.stream_info, &block2->data.stream_info);
 646                 case FLAC__METADATA_TYPE_PADDING:
 647                         return true; /* we don't compare the padding guts */
 648                 case FLAC__METADATA_TYPE_APPLICATION:
 649                         return compare_block_data_application_(&block1->data.application, &block2->data.application, block1->length);
 650                 case FLAC__METADATA_TYPE_SEEKTABLE:
 651                         return compare_block_data_seektable_(&block1->data.seek_table, &block2->data.seek_table);
 652                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 653                         return compare_block_data_vorbiscomment_(&block1->data.vorbis_comment, &block2->data.vorbis_comment);
 654                 case FLAC__METADATA_TYPE_CUESHEET:
 655                         return compare_block_data_cuesheet_(&block1->data.cue_sheet, &block2->data.cue_sheet);
 656                 default:
 657                         FLAC__ASSERT(0);
 658                         return false;
 659         }
 660 }
 661
 662 FLAC_API FLAC__bool FLAC__metadata_object_application_set_data(FLAC__StreamMetadata *object, FLAC__byte *data, unsigned length, FLAC__bool copy)
 663 {
 664         FLAC__byte *save;
 665
 666         FLAC__ASSERT(0 != object);
 667         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_APPLICATION);
 668         FLAC__ASSERT((0 != data && length > 0) || (0 == data && length == 0 && copy == false));
 669
 670         save = object->data.application.data;
 671
 672         /* do the copy first so that if we fail we leave the object untouched */
 673         if(copy) {
 674                 if(!copy_bytes_(&object->data.application.data, data, length))
 675                         return false;
 676         }
 677         else {
 678                 object->data.application.data = data;
 679         }
 680
 681         if(0 != save)
 682                 free(save);
 683
 684         object->length = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8 + length;
 685         return true;
 686 }
 687
 688 FLAC_API FLAC__bool FLAC__metadata_object_seektable_resize_points(FLAC__StreamMetadata *object, unsigned new_num_points)
 689 {
 690         FLAC__ASSERT(0 != object);
 691         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 692
 693         if(0 == object->data.seek_table.points) {
 694                 FLAC__ASSERT(object->data.seek_table.num_points == 0);
 695                 if(0 == new_num_points)
 696                         return true;
 697                 else if(0 == (object->data.seek_table.points = seekpoint_array_new_(new_num_points)))
 698                         return false;
 699         }
 700         else {
 701                 const unsigned old_size = object->data.seek_table.num_points * sizeof(FLAC__StreamMetadata_SeekPoint);
 702                 const unsigned new_size = new_num_points * sizeof(FLAC__StreamMetadata_SeekPoint);
 703
 704                 FLAC__ASSERT(object->data.seek_table.num_points > 0);
 705
 706                 if(new_size == 0) {
 707                         free(object->data.seek_table.points);
 708                         object->data.seek_table.points = 0;
 709                 }
 710                 else if(0 == (object->data.seek_table.points = (FLAC__StreamMetadata_SeekPoint*)realloc(object->data.seek_table.points, new_size)))
 711                         return false;
 712
 713                 /* if growing, set new elements to placeholders */
 714                 if(new_size > old_size) {
 715                         unsigned i;
 716                         for(i = object->data.seek_table.num_points; i < new_num_points; i++) {
 717                                 object->data.seek_table.points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
 718                                 object->data.seek_table.points[i].stream_offset = 0;
 719                                 object->data.seek_table.points[i].frame_samples = 0;
 720                         }
 721                 }
 722         }
 723
 724         object->data.seek_table.num_points = new_num_points;
 725
 726         seektable_calculate_length_(object);
 727         return true;
 728 }
 729
 730 FLAC_API void FLAC__metadata_object_seektable_set_point(FLAC__StreamMetadata *object, unsigned point_num, FLAC__StreamMetadata_SeekPoint point)
 731 {
 732         FLAC__ASSERT(0 != object);
 733         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 734         FLAC__ASSERT(point_num < object->data.seek_table.num_points);
 735
 736         object->data.seek_table.points[point_num] = point;
 737 }
 738
 739 FLAC_API FLAC__bool FLAC__metadata_object_seektable_insert_point(FLAC__StreamMetadata *object, unsigned point_num, FLAC__StreamMetadata_SeekPoint point)
 740 {
 741         int i;
 742
 743         FLAC__ASSERT(0 != object);
 744         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 745         FLAC__ASSERT(point_num <= object->data.seek_table.num_points);
 746
 747         if(!FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points+1))
 748                 return false;
 749
 750         /* move all points >= point_num forward one space */
 751         for(i = (int)object->data.seek_table.num_points-1; i > (int)point_num; i--)
 752                 object->data.seek_table.points[i] = object->data.seek_table.points[i-1];
 753
 754         FLAC__metadata_object_seektable_set_point(object, point_num, point);
 755         seektable_calculate_length_(object);
 756         return true;
 757 }
 758
 759 FLAC_API FLAC__bool FLAC__metadata_object_seektable_delete_point(FLAC__StreamMetadata *object, unsigned point_num)
 760 {
 761         unsigned i;
 762
 763         FLAC__ASSERT(0 != object);
 764         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 765         FLAC__ASSERT(point_num < object->data.seek_table.num_points);
 766
 767         /* move all points > point_num backward one space */
 768         for(i = point_num; i < object->data.seek_table.num_points-1; i++)
 769                 object->data.seek_table.points[i] = object->data.seek_table.points[i+1];
 770
 771         return FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points-1);
 772 }
 773
 774 FLAC_API FLAC__bool FLAC__metadata_object_seektable_is_legal(const FLAC__StreamMetadata *object)
 775 {
 776         FLAC__ASSERT(0 != object);
 777         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 778
 779         return FLAC__format_seektable_is_legal(&object->data.seek_table);
 780 }
 781
 782 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_placeholders(FLAC__StreamMetadata *object, unsigned num)
 783 {
 784         FLAC__ASSERT(0 != object);
 785         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 786
 787         if(num > 0)
 788                 /* WATCHOUT: we rely on the fact that growing the array adds PLACEHOLDERS at the end */
 789                 return FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points + num);
 790         else
 791                 return true;
 792 }
 793
 794 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_point(FLAC__StreamMetadata *object, FLAC__uint64 sample_number)
 795 {
 796         FLAC__StreamMetadata_SeekTable *seek_table;
 797
 798         FLAC__ASSERT(0 != object);
 799         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 800
 801         seek_table = &object->data.seek_table;
 802
 803         if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + 1))
 804                 return false;
 805
 806         seek_table->points[seek_table->num_points - 1].sample_number = sample_number;
 807         seek_table->points[seek_table->num_points - 1].stream_offset = 0;
 808         seek_table->points[seek_table->num_points - 1].frame_samples = 0;
 809
 810         return true;
 811 }
 812
 813 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_points(FLAC__StreamMetadata *object, FLAC__uint64 sample_numbers[], unsigned num)
 814 {
 815         FLAC__ASSERT(0 != object);
 816         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 817         FLAC__ASSERT(0 != sample_numbers || num == 0);
 818
 819         if(num > 0) {
 820                 FLAC__StreamMetadata_SeekTable *seek_table = &object->data.seek_table;
 821                 unsigned i, j;
 822
 823                 i = seek_table->num_points;
 824
 825                 if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + num))
 826                         return false;
 827
 828                 for(j = 0; j < num; i++, j++) {
 829                         seek_table->points[i].sample_number = sample_numbers[j];
 830                         seek_table->points[i].stream_offset = 0;
 831                         seek_table->points[i].frame_samples = 0;
 832                 }
 833         }
 834
 835         return true;
 836 }
 837
 838 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_spaced_points(FLAC__StreamMetadata *object, unsigned num, FLAC__uint64 total_samples)
 839 {
 840         FLAC__ASSERT(0 != object);
 841         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 842         FLAC__ASSERT(total_samples > 0);
 843
 844         if(num > 0) {
 845                 FLAC__StreamMetadata_SeekTable *seek_table = &object->data.seek_table;
 846                 unsigned i, j;
 847
 848                 i = seek_table->num_points;
 849
 850                 if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + num))
 851                         return false;
 852
 853                 for(j = 0; j < num; i++, j++) {
 854                         seek_table->points[i].sample_number = total_samples * (FLAC__uint64)j / (FLAC__uint64)num;
 855                         seek_table->points[i].stream_offset = 0;
 856                         seek_table->points[i].frame_samples = 0;
 857                 }
 858         }
 859
 860         return true;
 861 }
 862
 863 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_sort(FLAC__StreamMetadata *object, FLAC__bool compact)
 864 {
 865         unsigned unique;
 866
 867         FLAC__ASSERT(0 != object);
 868         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 869
 870         unique = FLAC__format_seektable_sort(&object->data.seek_table);
 871
 872         return !compact || FLAC__metadata_object_seektable_resize_points(object, unique);
 873 }
 874
 875 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_vendor_string(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
 876 {
 877         return vorbiscomment_set_entry_(object, &object->data.vorbis_comment.vendor_string, &entry, copy);
 878 }
 879
 880 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_resize_comments(FLAC__StreamMetadata *object, unsigned new_num_comments)
 881 {
 882         FLAC__ASSERT(0 != object);
 883         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 884
 885         if(0 == object->data.vorbis_comment.comments) {
 886                 FLAC__ASSERT(object->data.vorbis_comment.num_comments == 0);
 887                 if(0 == new_num_comments)
 888                         return true;
 889                 else if(0 == (object->data.vorbis_comment.comments = vorbiscomment_entry_array_new_(new_num_comments)))
 890                         return false;
 891         }
 892         else {
 893                 const unsigned old_size = object->data.vorbis_comment.num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry);
 894                 const unsigned new_size = new_num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry);
 895
 896                 FLAC__ASSERT(object->data.vorbis_comment.num_comments > 0);
 897
 898                 /* if shrinking, free the truncated entries */
 899                 if(new_num_comments < object->data.vorbis_comment.num_comments) {
 900                         unsigned i;
 901                         for(i = new_num_comments; i < object->data.vorbis_comment.num_comments; i++)
 902                                 if(0 != object->data.vorbis_comment.comments[i].entry)
 903                                         free(object->data.vorbis_comment.comments[i].entry);
 904                 }
 905
 906                 if(new_size == 0) {
 907                         free(object->data.vorbis_comment.comments);
 908                         object->data.vorbis_comment.comments = 0;
 909                 }
 910                 else if(0 == (object->data.vorbis_comment.comments = (FLAC__StreamMetadata_VorbisComment_Entry*)realloc(object->data.vorbis_comment.comments, new_size)))
 911                         return false;
 912
 913                 /* if growing, zero all the length/pointers of new elements */
 914                 if(new_size > old_size)
 915                         memset(object->data.vorbis_comment.comments + object->data.vorbis_comment.num_comments, 0, new_size - old_size);
 916         }
 917
 918         object->data.vorbis_comment.num_comments = new_num_comments;
 919
 920         vorbiscomment_calculate_length_(object);
 921         return true;
 922 }
 923
 924 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_comment(FLAC__StreamMetadata *object, unsigned comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
 925 {
 926         return vorbiscomment_set_entry_(object, &object->data.vorbis_comment.comments[comment_num], &entry, copy);
 927 }
 928
 929 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_insert_comment(FLAC__StreamMetadata *object, unsigned comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
 930 {
 931         FLAC__StreamMetadata_VorbisComment *vc;
 932
 933         FLAC__ASSERT(0 != object);
 934         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 935         FLAC__ASSERT(comment_num <= object->data.vorbis_comment.num_comments);
 936
 937         vc = &object->data.vorbis_comment;
 938
 939         if(!FLAC__metadata_object_vorbiscomment_resize_comments(object, vc->num_comments+1))
 940                 return false;
 941
 942         /* move all comments >= comment_num forward one space */
 943         memmove(&vc->comments[comment_num+1], &vc->comments[comment_num], sizeof(FLAC__StreamMetadata_VorbisComment_Entry)*(vc->num_comments-1-comment_num));
 944         vc->comments[comment_num].length = 0;
 945         vc->comments[comment_num].entry = 0;
 946
 947         return FLAC__metadata_object_vorbiscomment_set_comment(object, comment_num, entry, copy);
 948 }
 949
 950 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_delete_comment(FLAC__StreamMetadata *object, unsigned comment_num)
 951 {
 952         FLAC__StreamMetadata_VorbisComment *vc;
 953
 954         FLAC__ASSERT(0 != object);
 955         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 956         FLAC__ASSERT(comment_num < object->data.vorbis_comment.num_comments);
 957
 958         vc = &object->data.vorbis_comment;
 959
 960         /* free the comment at comment_num */
 961         if(0 != vc->comments[comment_num].entry)
 962                 free(vc->comments[comment_num].entry);
 963
 964         /* move all comments > comment_num backward one space */
 965         memmove(&vc->comments[comment_num], &vc->comments[comment_num+1], sizeof(FLAC__StreamMetadata_VorbisComment_Entry)*(vc->num_comments-comment_num-1));
 966         vc->comments[vc->num_comments-1].length = 0;
 967         vc->comments[vc->num_comments-1].entry = 0;
 968
 969         return FLAC__metadata_object_vorbiscomment_resize_comments(object, vc->num_comments-1);
 970 }
 971
 972 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_matches(const FLAC__StreamMetadata_VorbisComment_Entry *entry, const char *field_name, unsigned field_name_length)
 973 {
 974         const FLAC__byte *eq = (FLAC__byte*)memchr(entry->entry, '=', entry->length);
 975 #if defined _MSC_VER || defined __MINGW32__
 976 #define FLAC__STRNCASECMP strnicmp
 977 #else
 978 #define FLAC__STRNCASECMP strncasecmp
 979 #endif
 980         return (0 != eq && (unsigned)(eq-entry->entry) == field_name_length && 0 == FLAC__STRNCASECMP(field_name, (const char *)entry->entry, field_name_length));
 981 #undef FLAC__STRNCASECMP
 982 }
 983
 984 FLAC_API int FLAC__metadata_object_vorbiscomment_find_entry_from(const FLAC__StreamMetadata *object, unsigned offset, const char *field_name)
 985 {
 986         const unsigned field_name_length = strlen(field_name);
 987         unsigned i;
 988
 989         FLAC__ASSERT(0 != object);
 990         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 991
 992         for(i = offset; i < object->data.vorbis_comment.num_comments; i++) {
 993                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments + i, field_name, field_name_length))
 994                         return (int)i;
 995         }
 996
 997         return -1;
 998 }
 999
1000 FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entry_matching(FLAC__StreamMetadata *object, const char *field_name)
1001 {
1002         const unsigned field_name_length = strlen(field_name);
1003         unsigned i;
1004
1005         FLAC__ASSERT(0 != object);
1006         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1007
1008         for(i = 0; i < object->data.vorbis_comment.num_comments; i++) {
1009                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments + i, field_name, field_name_length)) {
1010                         if(!FLAC__metadata_object_vorbiscomment_delete_comment(object, i))
1011                                 return -1;
1012                         else
1013                                 return 1;
1014                 }
1015         }
1016
1017         return 0;
1018 }
1019
1020 FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entries_matching(FLAC__StreamMetadata *object, const char *field_name)
1021 {
1022         FLAC__bool ok = true;
1023         unsigned matching = 0;
1024         const unsigned field_name_length = strlen(field_name);
1025         int i;
1026
1027         FLAC__ASSERT(0 != object);
1028         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1029
1030         /* must delete from end to start otherwise it will interfere with our iteration */
1031         for(i = (int)object->data.vorbis_comment.num_comments - 1; ok && i >= 0; i--) {
1032                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments + i, field_name, field_name_length)) {
1033                         matching++;
1034                         ok &= FLAC__metadata_object_vorbiscomment_delete_comment(object, (unsigned)i);
1035                 }
1036         }
1037
1038         return ok? (int)matching : -1;
1039 }
1040
1041 FLAC_API FLAC__StreamMetadata_CueSheet_Track *FLAC__metadata_object_cuesheet_track_new()
1042 {
1043         return (FLAC__StreamMetadata_CueSheet_Track*)calloc(1, sizeof(FLAC__StreamMetadata_CueSheet_Track));
1044 }
1045
1046 FLAC_API FLAC__StreamMetadata_CueSheet_Track *FLAC__metadata_object_cuesheet_track_clone(const FLAC__StreamMetadata_CueSheet_Track *object)
1047 {
1048         FLAC__StreamMetadata_CueSheet_Track *to;
1049
1050         FLAC__ASSERT(0 != object);
1051
1052         if(0 != (to = FLAC__metadata_object_cuesheet_track_new())) {
1053                 if(!copy_track_(to, object)) {
1054                         FLAC__metadata_object_cuesheet_track_delete(to);
1055                         return 0;
1056                 }
1057         }
1058
1059         return to;
1060 }
1061
1062 void FLAC__metadata_object_cuesheet_track_delete_data(FLAC__StreamMetadata_CueSheet_Track *object)
1063 {
1064         FLAC__ASSERT(0 != object);
1065
1066         if(0 != object->indices) {
1067                 FLAC__ASSERT(object->num_indices > 0);
1068                 free(object->indices);
1069         }
1070 }
1071
1072 FLAC_API void FLAC__metadata_object_cuesheet_track_delete(FLAC__StreamMetadata_CueSheet_Track *object)
1073 {
1074         FLAC__metadata_object_cuesheet_track_delete_data(object);
1075         free(object);
1076 }
1077
1078 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_resize_indices(FLAC__StreamMetadata *object, unsigned track_num, unsigned new_num_indices)
1079 {
1080         FLAC__StreamMetadata_CueSheet_Track *track;
1081         FLAC__ASSERT(0 != object);
1082         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1083         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1084
1085         track = &object->data.cue_sheet.tracks[track_num];
1086
1087         if(0 == track->indices) {
1088                 FLAC__ASSERT(track->num_indices == 0);
1089                 if(0 == new_num_indices)
1090                         return true;
1091                 else if(0 == (track->indices = cuesheet_track_index_array_new_(new_num_indices)))
1092                         return false;
1093         }
1094         else {
1095                 const unsigned old_size = track->num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index);
1096                 const unsigned new_size = new_num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index);
1097
1098                 FLAC__ASSERT(track->num_indices > 0);
1099
1100                 if(new_size == 0) {
1101                         free(track->indices);
1102                         track->indices = 0;
1103                 }
1104                 else if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)realloc(track->indices, new_size)))
1105                         return false;
1106
1107                 /* if growing, zero all the lengths/pointers of new elements */
1108                 if(new_size > old_size)
1109                         memset(track->indices + track->num_indices, 0, new_size - old_size);
1110         }
1111
1112         track->num_indices = new_num_indices;
1113
1114         cuesheet_calculate_length_(object);
1115         return true;
1116 }
1117
1118 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)
1119 {
1120         FLAC__StreamMetadata_CueSheet_Track *track;
1121
1122         FLAC__ASSERT(0 != object);
1123         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1124         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1125         FLAC__ASSERT(index_num <= object->data.cue_sheet.tracks[track_num].num_indices);
1126
1127         track = &object->data.cue_sheet.tracks[track_num];
1128
1129         if(!FLAC__metadata_object_cuesheet_track_resize_indices(object, track_num, track->num_indices+1))
1130                 return false;
1131
1132         /* move all indices >= index_num forward one space */
1133         memmove(&track->indices[index_num+1], &track->indices[index_num], sizeof(FLAC__StreamMetadata_CueSheet_Index)*(track->num_indices-1-index_num));
1134
1135         track->indices[index_num] = index;
1136         cuesheet_calculate_length_(object);
1137         return true;
1138 }
1139
1140 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_insert_blank_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num)
1141 {
1142         FLAC__StreamMetadata_CueSheet_Index index;
1143         memset(&index, 0, sizeof(index));
1144         return FLAC__metadata_object_cuesheet_track_insert_index(object, track_num, index_num, index);
1145 }
1146
1147 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_delete_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num)
1148 {
1149         FLAC__StreamMetadata_CueSheet_Track *track;
1150
1151         FLAC__ASSERT(0 != object);
1152         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1153         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1154         FLAC__ASSERT(index_num < object->data.cue_sheet.tracks[track_num].num_indices);
1155
1156         track = &object->data.cue_sheet.tracks[track_num];
1157
1158         /* move all indices > index_num backward one space */
1159         memmove(&track->indices[index_num], &track->indices[index_num+1], sizeof(FLAC__StreamMetadata_CueSheet_Index)*(track->num_indices-index_num-1));
1160
1161         FLAC__metadata_object_cuesheet_track_resize_indices(object, track_num, track->num_indices-1);
1162         cuesheet_calculate_length_(object);
1163         return true;
1164 }
1165
1166 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_resize_tracks(FLAC__StreamMetadata *object, unsigned new_num_tracks)
1167 {
1168         FLAC__ASSERT(0 != object);
1169         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1170
1171         if(0 == object->data.cue_sheet.tracks) {
1172                 FLAC__ASSERT(object->data.cue_sheet.num_tracks == 0);
1173                 if(0 == new_num_tracks)
1174                         return true;
1175                 else if(0 == (object->data.cue_sheet.tracks = cuesheet_track_array_new_(new_num_tracks)))
1176                         return false;
1177         }
1178         else {
1179                 const unsigned old_size = object->data.cue_sheet.num_tracks * sizeof(FLAC__StreamMetadata_CueSheet_Track);
1180                 const unsigned new_size = new_num_tracks * sizeof(FLAC__StreamMetadata_CueSheet_Track);
1181
1182                 FLAC__ASSERT(object->data.cue_sheet.num_tracks > 0);
1183
1184                 /* if shrinking, free the truncated entries */
1185                 if(new_num_tracks < object->data.cue_sheet.num_tracks) {
1186                         unsigned i;
1187                         for(i = new_num_tracks; i < object->data.cue_sheet.num_tracks; i++)
1188                                 if(0 != object->data.cue_sheet.tracks[i].indices)
1189                                         free(object->data.cue_sheet.tracks[i].indices);
1190                 }
1191
1192                 if(new_size == 0) {
1193                         free(object->data.cue_sheet.tracks);
1194                         object->data.cue_sheet.tracks = 0;
1195                 }
1196                 else if(0 == (object->data.cue_sheet.tracks = (FLAC__StreamMetadata_CueSheet_Track*)realloc(object->data.cue_sheet.tracks, new_size)))
1197                         return false;
1198
1199                 /* if growing, zero all the lengths/pointers of new elements */
1200                 if(new_size > old_size)
1201                         memset(object->data.cue_sheet.tracks + object->data.cue_sheet.num_tracks, 0, new_size - old_size);
1202         }
1203
1204         object->data.cue_sheet.num_tracks = new_num_tracks;
1205
1206         cuesheet_calculate_length_(object);
1207         return true;
1208 }
1209
1210 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_set_track(FLAC__StreamMetadata *object, unsigned track_num, FLAC__StreamMetadata_CueSheet_Track *track, FLAC__bool copy)
1211 {
1212         return cuesheet_set_track_(object, object->data.cue_sheet.tracks + track_num, track, copy);
1213 }
1214
1215 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_insert_track(FLAC__StreamMetadata *object, unsigned track_num, FLAC__StreamMetadata_CueSheet_Track *track, FLAC__bool copy)
1216 {
1217         FLAC__StreamMetadata_CueSheet *cs;
1218
1219         FLAC__ASSERT(0 != object);
1220         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1221         FLAC__ASSERT(track_num <= object->data.cue_sheet.num_tracks);
1222
1223         cs = &object->data.cue_sheet;
1224
1225         if(!FLAC__metadata_object_cuesheet_resize_tracks(object, cs->num_tracks+1))
1226                 return false;
1227
1228         /* move all tracks >= track_num forward one space */
1229         memmove(&cs->tracks[track_num+1], &cs->tracks[track_num], sizeof(FLAC__StreamMetadata_CueSheet_Track)*(cs->num_tracks-1-track_num));
1230         cs->tracks[track_num].num_indices = 0;
1231         cs->tracks[track_num].indices = 0;
1232
1233         return FLAC__metadata_object_cuesheet_set_track(object, track_num, track, copy);
1234 }
1235
1236 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_insert_blank_track(FLAC__StreamMetadata *object, unsigned track_num)
1237 {
1238         FLAC__StreamMetadata_CueSheet_Track track;
1239         memset(&track, 0, sizeof(track));
1240         return FLAC__metadata_object_cuesheet_insert_track(object, track_num, &track, /*copy=*/false);
1241 }
1242
1243 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_delete_track(FLAC__StreamMetadata *object, unsigned track_num)
1244 {
1245         FLAC__StreamMetadata_CueSheet *cs;
1246
1247         FLAC__ASSERT(0 != object);
1248         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1249         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1250
1251         cs = &object->data.cue_sheet;
1252
1253         /* free the track at track_num */
1254         if(0 != cs->tracks[track_num].indices)
1255                 free(cs->tracks[track_num].indices);
1256
1257         /* move all tracks > track_num backward one space */
1258         memmove(&cs->tracks[track_num], &cs->tracks[track_num+1], sizeof(FLAC__StreamMetadata_CueSheet_Track)*(cs->num_tracks-track_num-1));
1259         cs->tracks[cs->num_tracks-1].num_indices = 0;
1260         cs->tracks[cs->num_tracks-1].indices = 0;
1261
1262         return FLAC__metadata_object_cuesheet_resize_tracks(object, cs->num_tracks-1);
1263 }
1264
1265 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_is_legal(const FLAC__StreamMetadata *object, FLAC__bool check_cd_da_subset, const char **violation)
1266 {
1267         FLAC__ASSERT(0 != object);
1268         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1269
1270         return FLAC__format_cuesheet_is_legal(&object->data.cue_sheet, check_cd_da_subset, violation);
1271 }