src/libFLAC/metadata_object.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2001,2002,2003,2004,2005,2006  Josh Coalson
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * - Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * - Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * - Neither the name of the Xiph.org Foundation nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #if HAVE_CONFIG_H
  33 #  include <config.h>
  34 #endif
  35
  36 #include <stdlib.h>
  37 #include <string.h>
  38
  39 #include "private/metadata.h"
  40
  41 #include "FLAC/assert.h"
  42
  43
  44 /****************************************************************************
  45  *
  46  * Local routines
  47  *
  48  ***************************************************************************/
  49
  50 /* copy bytes:
  51  *  from = NULL  && bytes = 0
  52  *       to <- NULL
  53  *  from != NULL && bytes > 0
  54  *       to <- copy of from
  55  *  else ASSERT
  56  * malloc error leaved 'to' unchanged
  57  */
  58 static FLAC__bool copy_bytes_(FLAC__byte **to, const FLAC__byte *from, unsigned bytes)
  59 {
  60         FLAC__ASSERT(0 != to);
  61         if(bytes > 0 && 0 != from) {
  62                 FLAC__byte *x;
  63                 if(0 == (x = (FLAC__byte*)malloc(bytes)))
  64                         return false;
  65                 memcpy(x, from, bytes);
  66                 *to = x;
  67         }
  68         else {
  69                 FLAC__ASSERT(0 == from);
  70                 FLAC__ASSERT(bytes == 0);
  71                 *to = 0;
  72         }
  73         return true;
  74 }
  75
  76 #if 0 /* UNUSED */
  77 /* like copy_bytes_(), but free()s the original '*to' if the copy succeeds and the original '*to' is non-NULL */
  78 static FLAC__bool free_copy_bytes_(FLAC__byte **to, const FLAC__byte *from, unsigned bytes)
  79 {
  80         FLAC__byte *copy;
  81         FLAC__ASSERT(0 != to);
  82         if(copy_bytes_(&copy, from, bytes)) {
  83                 if(*to)
  84                         free(*to);
  85                 *to = copy;
  86                 return true;
  87         }
  88         else
  89                 return false;
  90 }
  91 #endif
  92
  93 /* reallocate entry to 1 byte larger and add a terminating NUL */
  94 /* realloc() failure leaves entry unchanged */
  95 static FLAC__bool ensure_null_terminated_(FLAC__byte **entry, unsigned length)
  96 {
  97         FLAC__byte *x = (FLAC__byte*)realloc(*entry, length+1);
  98         if(0 != x) {
  99                 x[length] = '\0';
 100                 *entry = x;
 101                 return true;
 102         }
 103         else
 104                 return false;
 105 }
 106
 107 /* copies the NUL-terminated C-string 'from' to '*to', leaving '*to'
 108  * unchanged if malloc fails, free()ing the original '*to' if it
 109  * succeeds and the original '*to' was not NULL
 110  */
 111 static FLAC__bool copy_cstring_(char **to, const char *from)
 112 {
 113         FLAC__ASSERT(to);
 114         char *copy = strdup(from);
 115         if(copy) {
 116                 if(*to)
 117                         free(*to);
 118                 *to = copy;
 119                 return true;
 120         }
 121         else
 122                 return false;
 123 }
 124
 125 static FLAC__bool copy_vcentry_(FLAC__StreamMetadata_VorbisComment_Entry *to, const FLAC__StreamMetadata_VorbisComment_Entry *from)
 126 {
 127         to->length = from->length;
 128         if(0 == from->entry) {
 129                 FLAC__ASSERT(from->length == 0);
 130                 to->entry = 0;
 131         }
 132         else {
 133                 FLAC__byte *x;
 134                 FLAC__ASSERT(from->length > 0);
 135                 if(0 == (x = (FLAC__byte*)malloc(from->length+1)))
 136                         return false;
 137                 memcpy(x, from->entry, from->length);
 138                 x[from->length] = '\0';
 139                 to->entry = x;
 140         }
 141         return true;
 142 }
 143
 144 static FLAC__bool copy_track_(FLAC__StreamMetadata_CueSheet_Track *to, const FLAC__StreamMetadata_CueSheet_Track *from)
 145 {
 146         memcpy(to, from, sizeof(FLAC__StreamMetadata_CueSheet_Track));
 147         if(0 == from->indices) {
 148                 FLAC__ASSERT(from->num_indices == 0);
 149         }
 150         else {
 151                 FLAC__StreamMetadata_CueSheet_Index *x;
 152                 FLAC__ASSERT(from->num_indices > 0);
 153                 if(0 == (x = (FLAC__StreamMetadata_CueSheet_Index*)malloc(from->num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index))))
 154                         return false;
 155                 memcpy(x, from->indices, from->num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index));
 156                 to->indices = x;
 157         }
 158         return true;
 159 }
 160
 161 static void seektable_calculate_length_(FLAC__StreamMetadata *object)
 162 {
 163         FLAC__ASSERT(0 != object);
 164         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 165
 166         object->length = object->data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
 167 }
 168
 169 static FLAC__StreamMetadata_SeekPoint *seekpoint_array_new_(unsigned num_points)
 170 {
 171         FLAC__StreamMetadata_SeekPoint *object_array;
 172
 173         FLAC__ASSERT(num_points > 0);
 174
 175         object_array = (FLAC__StreamMetadata_SeekPoint*)malloc(num_points * sizeof(FLAC__StreamMetadata_SeekPoint));
 176
 177         if(0 != object_array) {
 178                 unsigned i;
 179                 for(i = 0; i < num_points; i++) {
 180                         object_array[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
 181                         object_array[i].stream_offset = 0;
 182                         object_array[i].frame_samples = 0;
 183                 }
 184         }
 185
 186         return object_array;
 187 }
 188
 189 static void vorbiscomment_calculate_length_(FLAC__StreamMetadata *object)
 190 {
 191         unsigned i;
 192
 193         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 194
 195         object->length = (FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN) / 8;
 196         object->length += object->data.vorbis_comment.vendor_string.length;
 197         object->length += (FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8;
 198         for(i = 0; i < object->data.vorbis_comment.num_comments; i++) {
 199                 object->length += (FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8);
 200                 object->length += object->data.vorbis_comment.comments[i].length;
 201         }
 202 }
 203
 204 static FLAC__StreamMetadata_VorbisComment_Entry *vorbiscomment_entry_array_new_(unsigned num_comments)
 205 {
 206         FLAC__ASSERT(num_comments > 0);
 207
 208         return (FLAC__StreamMetadata_VorbisComment_Entry*)calloc(num_comments, sizeof(FLAC__StreamMetadata_VorbisComment_Entry));
 209 }
 210
 211 static void vorbiscomment_entry_array_delete_(FLAC__StreamMetadata_VorbisComment_Entry *object_array, unsigned num_comments)
 212 {
 213         unsigned i;
 214
 215         FLAC__ASSERT(0 != object_array && num_comments > 0);
 216
 217         for(i = 0; i < num_comments; i++)
 218                 if(0 != object_array[i].entry)
 219                         free(object_array[i].entry);
 220
 221         if(0 != object_array)
 222                 free(object_array);
 223 }
 224
 225 static FLAC__StreamMetadata_VorbisComment_Entry *vorbiscomment_entry_array_copy_(const FLAC__StreamMetadata_VorbisComment_Entry *object_array, unsigned num_comments)
 226 {
 227         FLAC__StreamMetadata_VorbisComment_Entry *return_array;
 228
 229         FLAC__ASSERT(0 != object_array);
 230         FLAC__ASSERT(num_comments > 0);
 231
 232         return_array = vorbiscomment_entry_array_new_(num_comments);
 233
 234         if(0 != return_array) {
 235                 unsigned i;
 236
 237                 for(i = 0; i < num_comments; i++) {
 238                         if(!copy_vcentry_(return_array+i, object_array+i)) {
 239                                 vorbiscomment_entry_array_delete_(return_array, num_comments);
 240                                 return 0;
 241                         }
 242                 }
 243         }
 244
 245         return return_array;
 246 }
 247
 248 static FLAC__bool vorbiscomment_set_entry_(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry *dest, const FLAC__StreamMetadata_VorbisComment_Entry *src, FLAC__bool copy)
 249 {
 250         FLAC__byte *save;
 251
 252         FLAC__ASSERT(0 != object);
 253         FLAC__ASSERT(0 != dest);
 254         FLAC__ASSERT(0 != src);
 255         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 256         FLAC__ASSERT((0 != src->entry && src->length > 0) || (0 == src->entry && src->length == 0));
 257
 258         save = dest->entry;
 259
 260         if(0 != src->entry && src->length > 0) {
 261                 if(copy) {
 262                         /* do the copy first so that if we fail we leave the dest object untouched */
 263                         if(!copy_vcentry_(dest, src))
 264                                 return false;
 265                 }
 266                 else {
 267                         /* we have to make sure that the string we're taking over is null-terminated */
 268
 269                         /*
 270                          * Stripping the const from src->entry is OK since we're taking
 271                          * ownership of the pointer.  This is a hack around a deficiency
 272                          * in the API where the same function is used for 'copy' and
 273                          * 'own', but the source entry is a const pointer.  If we were
 274                          * precise, the 'own' flavor would be a separate function with a
 275                          * non-const source pointer.  But it's not, so we hack away.
 276                          */
 277                         if(!ensure_null_terminated_((FLAC__byte**)(&src->entry), src->length))
 278                                 return false;
 279                         *dest = *src;
 280                 }
 281         }
 282         else {
 283                 /* the src is null */
 284                 *dest = *src;
 285         }
 286
 287         if(0 != save)
 288                 free(save);
 289
 290         vorbiscomment_calculate_length_(object);
 291         return true;
 292 }
 293
 294 static int vorbiscomment_find_entry_from_(const FLAC__StreamMetadata *object, unsigned offset, const char *field_name, unsigned field_name_length)
 295 {
 296         unsigned i;
 297
 298         FLAC__ASSERT(0 != object);
 299         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 300         FLAC__ASSERT(0 != field_name);
 301
 302         for(i = offset; i < object->data.vorbis_comment.num_comments; i++) {
 303                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments[i], field_name, field_name_length))
 304                         return (int)i;
 305         }
 306
 307         return -1;
 308 }
 309
 310 static void cuesheet_calculate_length_(FLAC__StreamMetadata *object)
 311 {
 312         unsigned i;
 313
 314         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
 315
 316         object->length = (
 317                 FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN +
 318                 FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN +
 319                 FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN +
 320                 FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN +
 321                 FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN
 322         ) / 8;
 323
 324         object->length += object->data.cue_sheet.num_tracks * (
 325                 FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN +
 326                 FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN +
 327                 FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN +
 328                 FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN +
 329                 FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN +
 330                 FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN +
 331                 FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN
 332         ) / 8;
 333
 334         for(i = 0; i < object->data.cue_sheet.num_tracks; i++) {
 335                 object->length += object->data.cue_sheet.tracks[i].num_indices * (
 336                         FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN +
 337                         FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN +
 338                         FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN
 339                 ) / 8;
 340         }
 341 }
 342
 343 static FLAC__StreamMetadata_CueSheet_Index *cuesheet_track_index_array_new_(unsigned num_indices)
 344 {
 345         FLAC__ASSERT(num_indices > 0);
 346
 347         return (FLAC__StreamMetadata_CueSheet_Index*)calloc(num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index));
 348 }
 349
 350 static FLAC__StreamMetadata_CueSheet_Track *cuesheet_track_array_new_(unsigned num_tracks)
 351 {
 352         FLAC__ASSERT(num_tracks > 0);
 353
 354         return (FLAC__StreamMetadata_CueSheet_Track*)calloc(num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track));
 355 }
 356
 357 static void cuesheet_track_array_delete_(FLAC__StreamMetadata_CueSheet_Track *object_array, unsigned num_tracks)
 358 {
 359         unsigned i;
 360
 361         FLAC__ASSERT(0 != object_array && num_tracks > 0);
 362
 363         for(i = 0; i < num_tracks; i++) {
 364                 if(0 != object_array[i].indices) {
 365                         FLAC__ASSERT(object_array[i].num_indices > 0);
 366                         free(object_array[i].indices);
 367                 }
 368         }
 369
 370         if(0 != object_array)
 371                 free(object_array);
 372 }
 373
 374 static FLAC__StreamMetadata_CueSheet_Track *cuesheet_track_array_copy_(const FLAC__StreamMetadata_CueSheet_Track *object_array, unsigned num_tracks)
 375 {
 376         FLAC__StreamMetadata_CueSheet_Track *return_array;
 377
 378         FLAC__ASSERT(0 != object_array);
 379         FLAC__ASSERT(num_tracks > 0);
 380
 381         return_array = cuesheet_track_array_new_(num_tracks);
 382
 383         if(0 != return_array) {
 384                 unsigned i;
 385
 386                 for(i = 0; i < num_tracks; i++) {
 387                         if(!copy_track_(return_array+i, object_array+i)) {
 388                                 cuesheet_track_array_delete_(return_array, num_tracks);
 389                                 return 0;
 390                         }
 391                 }
 392         }
 393
 394         return return_array;
 395 }
 396
 397 static FLAC__bool cuesheet_set_track_(FLAC__StreamMetadata *object, FLAC__StreamMetadata_CueSheet_Track *dest, const FLAC__StreamMetadata_CueSheet_Track *src, FLAC__bool copy)
 398 {
 399         FLAC__StreamMetadata_CueSheet_Index *save;
 400
 401         FLAC__ASSERT(0 != object);
 402         FLAC__ASSERT(0 != dest);
 403         FLAC__ASSERT(0 != src);
 404         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
 405         FLAC__ASSERT((0 != src->indices && src->num_indices > 0) || (0 == src->indices && src->num_indices == 0));
 406
 407         save = dest->indices;
 408
 409         /* do the copy first so that if we fail we leave the object untouched */
 410         if(copy) {
 411                 if(!copy_track_(dest, src))
 412                         return false;
 413         }
 414         else {
 415                 *dest = *src;
 416         }
 417
 418         if(0 != save)
 419                 free(save);
 420
 421         cuesheet_calculate_length_(object);
 422         return true;
 423 }
 424
 425
 426 /****************************************************************************
 427  *
 428  * Metadata object routines
 429  *
 430  ***************************************************************************/
 431
 432 FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_new(FLAC__MetadataType type)
 433 {
 434         FLAC__StreamMetadata *object;
 435
 436         if(type > FLAC__MAX_METADATA_TYPE_CODE)
 437                 return 0;
 438
 439         object = (FLAC__StreamMetadata*)calloc(1, sizeof(FLAC__StreamMetadata));
 440         if(0 != object) {
 441                 object->is_last = false;
 442                 object->type = type;
 443                 switch(type) {
 444                         case FLAC__METADATA_TYPE_STREAMINFO:
 445                                 object->length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
 446                                 break;
 447                         case FLAC__METADATA_TYPE_PADDING:
 448                                 /* calloc() took care of this for us:
 449                                 object->length = 0;
 450                                 */
 451                                 break;
 452                         case FLAC__METADATA_TYPE_APPLICATION:
 453                                 object->length = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
 454                                 /* calloc() took care of this for us:
 455                                 object->data.application.data = 0;
 456                                 */
 457                                 break;
 458                         case FLAC__METADATA_TYPE_SEEKTABLE:
 459                                 /* calloc() took care of this for us:
 460                                 object->length = 0;
 461                                 object->data.seek_table.num_points = 0;
 462                                 object->data.seek_table.points = 0;
 463                                 */
 464                                 break;
 465                         case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 466                                 object->data.vorbis_comment.vendor_string.length = (unsigned)strlen(FLAC__VENDOR_STRING);
 467                                 if(!copy_bytes_(&object->data.vorbis_comment.vendor_string.entry, (const FLAC__byte*)FLAC__VENDOR_STRING, object->data.vorbis_comment.vendor_string.length+1)) {
 468                                         free(object);
 469                                         return 0;
 470                                 }
 471                                 vorbiscomment_calculate_length_(object);
 472                                 break;
 473                         case FLAC__METADATA_TYPE_CUESHEET:
 474                                 cuesheet_calculate_length_(object);
 475                                 break;
 476                         case FLAC__METADATA_TYPE_PICTURE:
 477                                 object->length = (
 478                                         FLAC__STREAM_METADATA_PICTURE_TYPE_LEN +
 479                                         FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN + /* empty mime_type string */
 480                                         FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN + /* empty description string */
 481                                         FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN +
 482                                         FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN +
 483                                         FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN +
 484                                         FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN +
 485                                         0 /* no data */
 486                                 ) / 8;
 487                                 object->data.picture.type = FLAC__STREAM_METADATA_PICTURE_TYPE_OTHER;
 488                                 object->data.picture.mime_type = 0;
 489                                 object->data.picture.description = 0;
 490                                 /* calloc() took care of this for us:
 491                                 object->data.picture.width = 0;
 492                                 object->data.picture.height = 0;
 493                                 object->data.picture.depth = 0;
 494                                 object->data.picture.data_length = 0;
 495                                 object->data.picture.data = 0;
 496                                 */
 497                                 /* now initialize mime_type and description with empty strings to make things easier on the client */
 498                                 if(!copy_cstring_(&object->data.picture.mime_type, "")) {
 499                                         free(object);
 500                                         return 0;
 501                                 }
 502                                 if(!copy_cstring_((char**)(&object->data.picture.description), "")) {
 503                                         if(object->data.picture.mime_type)
 504                                                 free(object->data.picture.mime_type);
 505                                         free(object);
 506                                         return 0;
 507                                 }
 508                                 break;
 509                         default:
 510                                 /* calloc() took care of this for us:
 511                                 object->length = 0;
 512                                 object->data.unknown.data = 0;
 513                                 */
 514                                 break;
 515                 }
 516         }
 517
 518         return object;
 519 }
 520
 521 FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_clone(const FLAC__StreamMetadata *object)
 522 {
 523         FLAC__StreamMetadata *to;
 524
 525         FLAC__ASSERT(0 != object);
 526
 527         if(0 != (to = FLAC__metadata_object_new(object->type))) {
 528                 to->is_last = object->is_last;
 529                 to->type = object->type;
 530                 to->length = object->length;
 531                 switch(to->type) {
 532                         case FLAC__METADATA_TYPE_STREAMINFO:
 533                                 memcpy(&to->data.stream_info, &object->data.stream_info, sizeof(FLAC__StreamMetadata_StreamInfo));
 534                                 break;
 535                         case FLAC__METADATA_TYPE_PADDING:
 536                                 break;
 537                         case FLAC__METADATA_TYPE_APPLICATION:
 538                                 memcpy(&to->data.application.id, &object->data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8);
 539                                 if(!copy_bytes_(&to->data.application.data, object->data.application.data, object->length - FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8)) {
 540                                         FLAC__metadata_object_delete(to);
 541                                         return 0;
 542                                 }
 543                                 break;
 544                         case FLAC__METADATA_TYPE_SEEKTABLE:
 545                                 to->data.seek_table.num_points = object->data.seek_table.num_points;
 546                                 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))) {
 547                                         FLAC__metadata_object_delete(to);
 548                                         return 0;
 549                                 }
 550                                 break;
 551                         case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 552                                 if(0 != to->data.vorbis_comment.vendor_string.entry) {
 553                                         free(to->data.vorbis_comment.vendor_string.entry);
 554                                         to->data.vorbis_comment.vendor_string.entry = 0;
 555                                 }
 556                                 if(!copy_vcentry_(&to->data.vorbis_comment.vendor_string, &object->data.vorbis_comment.vendor_string)) {
 557                                         FLAC__metadata_object_delete(to);
 558                                         return 0;
 559                                 }
 560                                 if(object->data.vorbis_comment.num_comments == 0) {
 561                                         FLAC__ASSERT(0 == object->data.vorbis_comment.comments);
 562                                         to->data.vorbis_comment.comments = 0;
 563                                 }
 564                                 else {
 565                                         FLAC__ASSERT(0 != object->data.vorbis_comment.comments);
 566                                         to->data.vorbis_comment.comments = vorbiscomment_entry_array_copy_(object->data.vorbis_comment.comments, object->data.vorbis_comment.num_comments);
 567                                         if(0 == to->data.vorbis_comment.comments) {
 568                                                 FLAC__metadata_object_delete(to);
 569                                                 return 0;
 570                                         }
 571                                 }
 572                                 to->data.vorbis_comment.num_comments = object->data.vorbis_comment.num_comments;
 573                                 break;
 574                         case FLAC__METADATA_TYPE_CUESHEET:
 575                                 memcpy(&to->data.cue_sheet, &object->data.cue_sheet, sizeof(FLAC__StreamMetadata_CueSheet));
 576                                 if(object->data.cue_sheet.num_tracks == 0) {
 577                                         FLAC__ASSERT(0 == object->data.cue_sheet.tracks);
 578                                 }
 579                                 else {
 580                                         FLAC__ASSERT(0 != object->data.cue_sheet.tracks);
 581                                         to->data.cue_sheet.tracks = cuesheet_track_array_copy_(object->data.cue_sheet.tracks, object->data.cue_sheet.num_tracks);
 582                                         if(0 == to->data.cue_sheet.tracks) {
 583                                                 FLAC__metadata_object_delete(to);
 584                                                 return 0;
 585                                         }
 586                                 }
 587                                 break;
 588                         case FLAC__METADATA_TYPE_PICTURE:
 589                                 to->data.picture.type = object->data.picture.type;
 590                                 if(!copy_cstring_(&to->data.picture.mime_type, object->data.picture.mime_type)) {
 591                                         FLAC__metadata_object_delete(to);
 592                                         return 0;
 593                                 }
 594                                 if(!copy_cstring_((char**)(&to->data.picture.description), (const char*)object->data.picture.description)) {
 595                                         FLAC__metadata_object_delete(to);
 596                                         return 0;
 597                                 }
 598                                 to->data.picture.width = object->data.picture.width;
 599                                 to->data.picture.height = object->data.picture.height;
 600                                 to->data.picture.depth = object->data.picture.depth;
 601                                 to->data.picture.data_length = object->data.picture.data_length;
 602                                 if(!copy_bytes_((&to->data.picture.data), object->data.picture.data, object->data.picture.data_length)) {
 603                                         FLAC__metadata_object_delete(to);
 604                                         return 0;
 605                                 }
 606                                 break;
 607                         default:
 608                                 if(!copy_bytes_(&to->data.unknown.data, object->data.unknown.data, object->length)) {
 609                                         FLAC__metadata_object_delete(to);
 610                                         return 0;
 611                                 }
 612                                 break;
 613                 }
 614         }
 615
 616         return to;
 617 }
 618
 619 void FLAC__metadata_object_delete_data(FLAC__StreamMetadata *object)
 620 {
 621         FLAC__ASSERT(0 != object);
 622
 623         switch(object->type) {
 624                 case FLAC__METADATA_TYPE_STREAMINFO:
 625                 case FLAC__METADATA_TYPE_PADDING:
 626                         break;
 627                 case FLAC__METADATA_TYPE_APPLICATION:
 628                         if(0 != object->data.application.data) {
 629                                 free(object->data.application.data);
 630                                 object->data.application.data = 0;
 631                         }
 632                         break;
 633                 case FLAC__METADATA_TYPE_SEEKTABLE:
 634                         if(0 != object->data.seek_table.points) {
 635                                 free(object->data.seek_table.points);
 636                                 object->data.seek_table.points = 0;
 637                         }
 638                         break;
 639                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 640                         if(0 != object->data.vorbis_comment.vendor_string.entry) {
 641                                 free(object->data.vorbis_comment.vendor_string.entry);
 642                                 object->data.vorbis_comment.vendor_string.entry = 0;
 643                         }
 644                         if(0 != object->data.vorbis_comment.comments) {
 645                                 FLAC__ASSERT(object->data.vorbis_comment.num_comments > 0);
 646                                 vorbiscomment_entry_array_delete_(object->data.vorbis_comment.comments, object->data.vorbis_comment.num_comments);
 647                         }
 648                         break;
 649                 case FLAC__METADATA_TYPE_CUESHEET:
 650                         if(0 != object->data.cue_sheet.tracks) {
 651                                 FLAC__ASSERT(object->data.cue_sheet.num_tracks > 0);
 652                                 cuesheet_track_array_delete_(object->data.cue_sheet.tracks, object->data.cue_sheet.num_tracks);
 653                         }
 654                         break;
 655                 case FLAC__METADATA_TYPE_PICTURE:
 656                         if(0 != object->data.picture.mime_type) {
 657                                 free(object->data.picture.mime_type);
 658                                 object->data.picture.mime_type = 0;
 659                         }
 660                         if(0 != object->data.picture.description) {
 661                                 free(object->data.picture.description);
 662                                 object->data.picture.description = 0;
 663                         }
 664                         if(0 != object->data.picture.data) {
 665                                 free(object->data.picture.data);
 666                                 object->data.picture.data = 0;
 667                         }
 668                         break;
 669                 default:
 670                         if(0 != object->data.unknown.data) {
 671                                 free(object->data.unknown.data);
 672                                 object->data.unknown.data = 0;
 673                         }
 674                         break;
 675         }
 676 }
 677
 678 FLAC_API void FLAC__metadata_object_delete(FLAC__StreamMetadata *object)
 679 {
 680         FLAC__metadata_object_delete_data(object);
 681         free(object);
 682 }
 683
 684 static FLAC__bool compare_block_data_streaminfo_(const FLAC__StreamMetadata_StreamInfo *block1, const FLAC__StreamMetadata_StreamInfo *block2)
 685 {
 686         if(block1->min_blocksize != block2->min_blocksize)
 687                 return false;
 688         if(block1->max_blocksize != block2->max_blocksize)
 689                 return false;
 690         if(block1->min_framesize != block2->min_framesize)
 691                 return false;
 692         if(block1->max_framesize != block2->max_framesize)
 693                 return false;
 694         if(block1->sample_rate != block2->sample_rate)
 695                 return false;
 696         if(block1->channels != block2->channels)
 697                 return false;
 698         if(block1->bits_per_sample != block2->bits_per_sample)
 699                 return false;
 700         if(block1->total_samples != block2->total_samples)
 701                 return false;
 702         if(0 != memcmp(block1->md5sum, block2->md5sum, 16))
 703                 return false;
 704         return true;
 705 }
 706
 707 static FLAC__bool compare_block_data_application_(const FLAC__StreamMetadata_Application *block1, const FLAC__StreamMetadata_Application *block2, unsigned block_length)
 708 {
 709         FLAC__ASSERT(0 != block1);
 710         FLAC__ASSERT(0 != block2);
 711         FLAC__ASSERT(block_length >= sizeof(block1->id));
 712
 713         if(0 != memcmp(block1->id, block2->id, sizeof(block1->id)))
 714                 return false;
 715         if(0 != block1->data && 0 != block2->data)
 716                 return 0 == memcmp(block1->data, block2->data, block_length - sizeof(block1->id));
 717         else
 718                 return block1->data == block2->data;
 719 }
 720
 721 static FLAC__bool compare_block_data_seektable_(const FLAC__StreamMetadata_SeekTable *block1, const FLAC__StreamMetadata_SeekTable *block2)
 722 {
 723         unsigned i;
 724
 725         FLAC__ASSERT(0 != block1);
 726         FLAC__ASSERT(0 != block2);
 727
 728         if(block1->num_points != block2->num_points)
 729                 return false;
 730
 731         if(0 != block1->points && 0 != block2->points) {
 732                 for(i = 0; i < block1->num_points; i++) {
 733                         if(block1->points[i].sample_number != block2->points[i].sample_number)
 734                                 return false;
 735                         if(block1->points[i].stream_offset != block2->points[i].stream_offset)
 736                                 return false;
 737                         if(block1->points[i].frame_samples != block2->points[i].frame_samples)
 738                                 return false;
 739                 }
 740                 return true;
 741         }
 742         else
 743                 return block1->points == block2->points;
 744 }
 745
 746 static FLAC__bool compare_block_data_vorbiscomment_(const FLAC__StreamMetadata_VorbisComment *block1, const FLAC__StreamMetadata_VorbisComment *block2)
 747 {
 748         unsigned i;
 749
 750         if(block1->vendor_string.length != block2->vendor_string.length)
 751                 return false;
 752
 753         if(0 != block1->vendor_string.entry && 0 != block2->vendor_string.entry) {
 754                 if(0 != memcmp(block1->vendor_string.entry, block2->vendor_string.entry, block1->vendor_string.length))
 755                         return false;
 756         }
 757         else if(block1->vendor_string.entry != block2->vendor_string.entry)
 758                 return false;
 759
 760         if(block1->num_comments != block2->num_comments)
 761                 return false;
 762
 763         for(i = 0; i < block1->num_comments; i++) {
 764                 if(0 != block1->comments[i].entry && 0 != block2->comments[i].entry) {
 765                         if(0 != memcmp(block1->comments[i].entry, block2->comments[i].entry, block1->comments[i].length))
 766                                 return false;
 767                 }
 768                 else if(block1->comments[i].entry != block2->comments[i].entry)
 769                         return false;
 770         }
 771         return true;
 772 }
 773
 774 static FLAC__bool compare_block_data_cuesheet_(const FLAC__StreamMetadata_CueSheet *block1, const FLAC__StreamMetadata_CueSheet *block2)
 775 {
 776         unsigned i, j;
 777
 778         if(0 != strcmp(block1->media_catalog_number, block2->media_catalog_number))
 779                 return false;
 780
 781         if(block1->lead_in != block2->lead_in)
 782                 return false;
 783
 784         if(block1->is_cd != block2->is_cd)
 785                 return false;
 786
 787         if(block1->num_tracks != block2->num_tracks)
 788                 return false;
 789
 790         if(0 != block1->tracks && 0 != block2->tracks) {
 791                 FLAC__ASSERT(block1->num_tracks > 0);
 792                 for(i = 0; i < block1->num_tracks; i++) {
 793                         if(block1->tracks[i].offset != block2->tracks[i].offset)
 794                                 return false;
 795                         if(block1->tracks[i].number != block2->tracks[i].number)
 796                                 return false;
 797                         if(0 != memcmp(block1->tracks[i].isrc, block2->tracks[i].isrc, sizeof(block1->tracks[i].isrc)))
 798                                 return false;
 799                         if(block1->tracks[i].type != block2->tracks[i].type)
 800                                 return false;
 801                         if(block1->tracks[i].pre_emphasis != block2->tracks[i].pre_emphasis)
 802                                 return false;
 803                         if(block1->tracks[i].num_indices != block2->tracks[i].num_indices)
 804                                 return false;
 805                         if(0 != block1->tracks[i].indices && 0 != block2->tracks[i].indices) {
 806                                 FLAC__ASSERT(block1->tracks[i].num_indices > 0);
 807                                 for(j = 0; j < block1->tracks[i].num_indices; j++) {
 808                                         if(block1->tracks[i].indices[j].offset != block2->tracks[i].indices[j].offset)
 809                                                 return false;
 810                                         if(block1->tracks[i].indices[j].number != block2->tracks[i].indices[j].number)
 811                                                 return false;
 812                                 }
 813                         }
 814                         else if(block1->tracks[i].indices != block2->tracks[i].indices)
 815                                 return false;
 816                 }
 817         }
 818         else if(block1->tracks != block2->tracks)
 819                 return false;
 820         return true;
 821 }
 822
 823 static FLAC__bool compare_block_data_picture_(const FLAC__StreamMetadata_Picture *block1, const FLAC__StreamMetadata_Picture *block2)
 824 {
 825         if(block1->type != block2->type)
 826                 return false;
 827         if(block1->mime_type != block2->mime_type && (0 == block1->mime_type || 0 == block2->mime_type || strcmp(block1->mime_type, block2->mime_type)))
 828                 return false;
 829         if(block1->description != block2->description && (0 == block1->description || 0 == block2->description || strcmp((const char *)block1->description, (const char *)block2->description)))
 830                 return false;
 831         if(block1->width != block2->width)
 832                 return false;
 833         if(block1->height != block2->height)
 834                 return false;
 835         if(block1->depth != block2->depth)
 836                 return false;
 837         if(block1->data_length != block2->data_length)
 838                 return false;
 839         if(block1->data != block2->data && (0 == block1->data || 0 == block2->data || memcmp(block1->data, block2->data, block1->data_length)))
 840                 return false;
 841         return true;
 842 }
 843
 844 static FLAC__bool compare_block_data_unknown_(const FLAC__StreamMetadata_Unknown *block1, const FLAC__StreamMetadata_Unknown *block2, unsigned block_length)
 845 {
 846         FLAC__ASSERT(0 != block1);
 847         FLAC__ASSERT(0 != block2);
 848
 849         if(0 != block1->data && 0 != block2->data)
 850                 return 0 == memcmp(block1->data, block2->data, block_length);
 851         else
 852                 return block1->data == block2->data;
 853 }
 854
 855 FLAC_API FLAC__bool FLAC__metadata_object_is_equal(const FLAC__StreamMetadata *block1, const FLAC__StreamMetadata *block2)
 856 {
 857         FLAC__ASSERT(0 != block1);
 858         FLAC__ASSERT(0 != block2);
 859
 860         if(block1->type != block2->type) {
 861                 return false;
 862         }
 863         if(block1->is_last != block2->is_last) {
 864                 return false;
 865         }
 866         if(block1->length != block2->length) {
 867                 return false;
 868         }
 869         switch(block1->type) {
 870                 case FLAC__METADATA_TYPE_STREAMINFO:
 871                         return compare_block_data_streaminfo_(&block1->data.stream_info, &block2->data.stream_info);
 872                 case FLAC__METADATA_TYPE_PADDING:
 873                         return true; /* we don't compare the padding guts */
 874                 case FLAC__METADATA_TYPE_APPLICATION:
 875                         return compare_block_data_application_(&block1->data.application, &block2->data.application, block1->length);
 876                 case FLAC__METADATA_TYPE_SEEKTABLE:
 877                         return compare_block_data_seektable_(&block1->data.seek_table, &block2->data.seek_table);
 878                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 879                         return compare_block_data_vorbiscomment_(&block1->data.vorbis_comment, &block2->data.vorbis_comment);
 880                 case FLAC__METADATA_TYPE_CUESHEET:
 881                         return compare_block_data_cuesheet_(&block1->data.cue_sheet, &block2->data.cue_sheet);
 882                 case FLAC__METADATA_TYPE_PICTURE:
 883                         return compare_block_data_picture_(&block1->data.picture, &block2->data.picture);
 884                 default:
 885                         return compare_block_data_unknown_(&block1->data.unknown, &block2->data.unknown, block1->length);
 886         }
 887 }
 888
 889 FLAC_API FLAC__bool FLAC__metadata_object_application_set_data(FLAC__StreamMetadata *object, FLAC__byte *data, unsigned length, FLAC__bool copy)
 890 {
 891         FLAC__byte *save;
 892
 893         FLAC__ASSERT(0 != object);
 894         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_APPLICATION);
 895         FLAC__ASSERT((0 != data && length > 0) || (0 == data && length == 0 && copy == false));
 896
 897         save = object->data.application.data;
 898
 899         /* do the copy first so that if we fail we leave the object untouched */
 900         if(copy) {
 901                 if(!copy_bytes_(&object->data.application.data, data, length))
 902                         return false;
 903         }
 904         else {
 905                 object->data.application.data = data;
 906         }
 907
 908         if(0 != save)
 909                 free(save);
 910
 911         object->length = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8 + length;
 912         return true;
 913 }
 914
 915 FLAC_API FLAC__bool FLAC__metadata_object_seektable_resize_points(FLAC__StreamMetadata *object, unsigned new_num_points)
 916 {
 917         FLAC__ASSERT(0 != object);
 918         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 919
 920         if(0 == object->data.seek_table.points) {
 921                 FLAC__ASSERT(object->data.seek_table.num_points == 0);
 922                 if(0 == new_num_points)
 923                         return true;
 924                 else if(0 == (object->data.seek_table.points = seekpoint_array_new_(new_num_points)))
 925                         return false;
 926         }
 927         else {
 928                 const unsigned old_size = object->data.seek_table.num_points * sizeof(FLAC__StreamMetadata_SeekPoint);
 929                 const unsigned new_size = new_num_points * sizeof(FLAC__StreamMetadata_SeekPoint);
 930
 931                 FLAC__ASSERT(object->data.seek_table.num_points > 0);
 932
 933                 if(new_size == 0) {
 934                         free(object->data.seek_table.points);
 935                         object->data.seek_table.points = 0;
 936                 }
 937                 else if(0 == (object->data.seek_table.points = (FLAC__StreamMetadata_SeekPoint*)realloc(object->data.seek_table.points, new_size)))
 938                         return false;
 939
 940                 /* if growing, set new elements to placeholders */
 941                 if(new_size > old_size) {
 942                         unsigned i;
 943                         for(i = object->data.seek_table.num_points; i < new_num_points; i++) {
 944                                 object->data.seek_table.points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
 945                                 object->data.seek_table.points[i].stream_offset = 0;
 946                                 object->data.seek_table.points[i].frame_samples = 0;
 947                         }
 948                 }
 949         }
 950
 951         object->data.seek_table.num_points = new_num_points;
 952
 953         seektable_calculate_length_(object);
 954         return true;
 955 }
 956
 957 FLAC_API void FLAC__metadata_object_seektable_set_point(FLAC__StreamMetadata *object, unsigned point_num, FLAC__StreamMetadata_SeekPoint point)
 958 {
 959         FLAC__ASSERT(0 != object);
 960         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 961         FLAC__ASSERT(point_num < object->data.seek_table.num_points);
 962
 963         object->data.seek_table.points[point_num] = point;
 964 }
 965
 966 FLAC_API FLAC__bool FLAC__metadata_object_seektable_insert_point(FLAC__StreamMetadata *object, unsigned point_num, FLAC__StreamMetadata_SeekPoint point)
 967 {
 968         int i;
 969
 970         FLAC__ASSERT(0 != object);
 971         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 972         FLAC__ASSERT(point_num <= object->data.seek_table.num_points);
 973
 974         if(!FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points+1))
 975                 return false;
 976
 977         /* move all points >= point_num forward one space */
 978         for(i = (int)object->data.seek_table.num_points-1; i > (int)point_num; i--)
 979                 object->data.seek_table.points[i] = object->data.seek_table.points[i-1];
 980
 981         FLAC__metadata_object_seektable_set_point(object, point_num, point);
 982         seektable_calculate_length_(object);
 983         return true;
 984 }
 985
 986 FLAC_API FLAC__bool FLAC__metadata_object_seektable_delete_point(FLAC__StreamMetadata *object, unsigned point_num)
 987 {
 988         unsigned i;
 989
 990         FLAC__ASSERT(0 != object);
 991         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 992         FLAC__ASSERT(point_num < object->data.seek_table.num_points);
 993
 994         /* move all points > point_num backward one space */
 995         for(i = point_num; i < object->data.seek_table.num_points-1; i++)
 996                 object->data.seek_table.points[i] = object->data.seek_table.points[i+1];
 997
 998         return FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points-1);
 999 }
1000
1001 FLAC_API FLAC__bool FLAC__metadata_object_seektable_is_legal(const FLAC__StreamMetadata *object)
1002 {
1003         FLAC__ASSERT(0 != object);
1004         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1005
1006         return FLAC__format_seektable_is_legal(&object->data.seek_table);
1007 }
1008
1009 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_placeholders(FLAC__StreamMetadata *object, unsigned num)
1010 {
1011         FLAC__ASSERT(0 != object);
1012         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1013
1014         if(num > 0)
1015                 /* WATCHOUT: we rely on the fact that growing the array adds PLACEHOLDERS at the end */
1016                 return FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points + num);
1017         else
1018                 return true;
1019 }
1020
1021 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_point(FLAC__StreamMetadata *object, FLAC__uint64 sample_number)
1022 {
1023         FLAC__StreamMetadata_SeekTable *seek_table;
1024
1025         FLAC__ASSERT(0 != object);
1026         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1027
1028         seek_table = &object->data.seek_table;
1029
1030         if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + 1))
1031                 return false;
1032
1033         seek_table->points[seek_table->num_points - 1].sample_number = sample_number;
1034         seek_table->points[seek_table->num_points - 1].stream_offset = 0;
1035         seek_table->points[seek_table->num_points - 1].frame_samples = 0;
1036
1037         return true;
1038 }
1039
1040 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_points(FLAC__StreamMetadata *object, FLAC__uint64 sample_numbers[], unsigned num)
1041 {
1042         FLAC__ASSERT(0 != object);
1043         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1044         FLAC__ASSERT(0 != sample_numbers || num == 0);
1045
1046         if(num > 0) {
1047                 FLAC__StreamMetadata_SeekTable *seek_table = &object->data.seek_table;
1048                 unsigned i, j;
1049
1050                 i = seek_table->num_points;
1051
1052                 if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + num))
1053                         return false;
1054
1055                 for(j = 0; j < num; i++, j++) {
1056                         seek_table->points[i].sample_number = sample_numbers[j];
1057                         seek_table->points[i].stream_offset = 0;
1058                         seek_table->points[i].frame_samples = 0;
1059                 }
1060         }
1061
1062         return true;
1063 }
1064
1065 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_spaced_points(FLAC__StreamMetadata *object, unsigned num, FLAC__uint64 total_samples)
1066 {
1067         FLAC__ASSERT(0 != object);
1068         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1069         FLAC__ASSERT(total_samples > 0);
1070
1071         if(num > 0 && total_samples > 0) {
1072                 FLAC__StreamMetadata_SeekTable *seek_table = &object->data.seek_table;
1073                 unsigned i, j;
1074
1075                 i = seek_table->num_points;
1076
1077                 if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + num))
1078                         return false;
1079
1080                 for(j = 0; j < num; i++, j++) {
1081                         seek_table->points[i].sample_number = total_samples * (FLAC__uint64)j / (FLAC__uint64)num;
1082                         seek_table->points[i].stream_offset = 0;
1083                         seek_table->points[i].frame_samples = 0;
1084                 }
1085         }
1086
1087         return true;
1088 }
1089
1090 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(FLAC__StreamMetadata *object, unsigned samples, FLAC__uint64 total_samples)
1091 {
1092         FLAC__ASSERT(0 != object);
1093         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1094         FLAC__ASSERT(samples > 0);
1095         FLAC__ASSERT(total_samples > 0);
1096
1097         if(samples > 0 && total_samples > 0) {
1098                 FLAC__StreamMetadata_SeekTable *seek_table = &object->data.seek_table;
1099                 unsigned i, j;
1100                 FLAC__uint64 num, sample;
1101
1102                 num = 1 + total_samples / samples; /* 1+ for the first sample at 0 */
1103                 /* now account for the fact that we don't place a seekpoint at "total_samples" since samples are number from 0: */
1104                 if(total_samples % samples == 0)
1105                         num--;
1106
1107                 i = seek_table->num_points;
1108
1109                 if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + num))
1110                         return false;
1111
1112                 sample = 0;
1113                 for(j = 0; j < num; i++, j++, sample += samples) {
1114                         seek_table->points[i].sample_number = sample;
1115                         seek_table->points[i].stream_offset = 0;
1116                         seek_table->points[i].frame_samples = 0;
1117                 }
1118         }
1119
1120         return true;
1121 }
1122
1123 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_sort(FLAC__StreamMetadata *object, FLAC__bool compact)
1124 {
1125         unsigned unique;
1126
1127         FLAC__ASSERT(0 != object);
1128         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1129
1130         unique = FLAC__format_seektable_sort(&object->data.seek_table);
1131
1132         return !compact || FLAC__metadata_object_seektable_resize_points(object, unique);
1133 }
1134
1135 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_vendor_string(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
1136 {
1137         if(!FLAC__format_vorbiscomment_entry_value_is_legal(entry.entry, entry.length))
1138                 return false;
1139         return vorbiscomment_set_entry_(object, &object->data.vorbis_comment.vendor_string, &entry, copy);
1140 }
1141
1142 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_resize_comments(FLAC__StreamMetadata *object, unsigned new_num_comments)
1143 {
1144         FLAC__ASSERT(0 != object);
1145         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1146
1147         if(0 == object->data.vorbis_comment.comments) {
1148                 FLAC__ASSERT(object->data.vorbis_comment.num_comments == 0);
1149                 if(0 == new_num_comments)
1150                         return true;
1151                 else if(0 == (object->data.vorbis_comment.comments = vorbiscomment_entry_array_new_(new_num_comments)))
1152                         return false;
1153         }
1154         else {
1155                 const unsigned old_size = object->data.vorbis_comment.num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry);
1156                 const unsigned new_size = new_num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry);
1157
1158                 FLAC__ASSERT(object->data.vorbis_comment.num_comments > 0);
1159
1160                 /* if shrinking, free the truncated entries */
1161                 if(new_num_comments < object->data.vorbis_comment.num_comments) {
1162                         unsigned i;
1163                         for(i = new_num_comments; i < object->data.vorbis_comment.num_comments; i++)
1164                                 if(0 != object->data.vorbis_comment.comments[i].entry)
1165                                         free(object->data.vorbis_comment.comments[i].entry);
1166                 }
1167
1168                 if(new_size == 0) {
1169                         free(object->data.vorbis_comment.comments);
1170                         object->data.vorbis_comment.comments = 0;
1171                 }
1172                 else if(0 == (object->data.vorbis_comment.comments = (FLAC__StreamMetadata_VorbisComment_Entry*)realloc(object->data.vorbis_comment.comments, new_size)))
1173                         return false;
1174
1175                 /* if growing, zero all the length/pointers of new elements */
1176                 if(new_size > old_size)
1177                         memset(object->data.vorbis_comment.comments + object->data.vorbis_comment.num_comments, 0, new_size - old_size);
1178         }
1179
1180         object->data.vorbis_comment.num_comments = new_num_comments;
1181
1182         vorbiscomment_calculate_length_(object);
1183         return true;
1184 }
1185
1186 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_comment(FLAC__StreamMetadata *object, unsigned comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
1187 {
1188         FLAC__ASSERT(0 != object);
1189         FLAC__ASSERT(comment_num < object->data.vorbis_comment.num_comments);
1190
1191         if(!FLAC__format_vorbiscomment_entry_is_legal(entry.entry, entry.length))
1192                 return false;
1193         return vorbiscomment_set_entry_(object, &object->data.vorbis_comment.comments[comment_num], &entry, copy);
1194 }
1195
1196 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_insert_comment(FLAC__StreamMetadata *object, unsigned comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
1197 {
1198         FLAC__StreamMetadata_VorbisComment *vc;
1199
1200         FLAC__ASSERT(0 != object);
1201         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1202         FLAC__ASSERT(comment_num <= object->data.vorbis_comment.num_comments);
1203
1204         if(!FLAC__format_vorbiscomment_entry_is_legal(entry.entry, entry.length))
1205                 return false;
1206
1207         vc = &object->data.vorbis_comment;
1208
1209         if(!FLAC__metadata_object_vorbiscomment_resize_comments(object, vc->num_comments+1))
1210                 return false;
1211
1212         /* move all comments >= comment_num forward one space */
1213         memmove(&vc->comments[comment_num+1], &vc->comments[comment_num], sizeof(FLAC__StreamMetadata_VorbisComment_Entry)*(vc->num_comments-1-comment_num));
1214         vc->comments[comment_num].length = 0;
1215         vc->comments[comment_num].entry = 0;
1216
1217         return FLAC__metadata_object_vorbiscomment_set_comment(object, comment_num, entry, copy);
1218 }
1219
1220 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_append_comment(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
1221 {
1222         FLAC__ASSERT(0 != object);
1223         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1224         return FLAC__metadata_object_vorbiscomment_insert_comment(object, object->data.vorbis_comment.num_comments, entry, copy);
1225 }
1226
1227 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_replace_comment(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool all, FLAC__bool copy)
1228 {
1229         FLAC__ASSERT(0 != entry.entry && entry.length > 0);
1230
1231         if(!FLAC__format_vorbiscomment_entry_is_legal(entry.entry, entry.length))
1232                 return false;
1233
1234         {
1235                 int i;
1236                 unsigned field_name_length;
1237                 const FLAC__byte *eq = (FLAC__byte*)memchr(entry.entry, '=', entry.length);
1238
1239                 FLAC__ASSERT(0 != eq);
1240
1241                 if(0 == eq)
1242                         return false; /* double protection */
1243
1244                 field_name_length = eq-entry.entry;
1245
1246                 if((i = vorbiscomment_find_entry_from_(object, 0, (const char *)entry.entry, field_name_length)) >= 0) {
1247                         unsigned index = (unsigned)i;
1248                         if(!FLAC__metadata_object_vorbiscomment_set_comment(object, index, entry, copy))
1249                                 return false;
1250                         if(all && (index+1 < object->data.vorbis_comment.num_comments)) {
1251                                 for(i = vorbiscomment_find_entry_from_(object, index+1, (const char *)entry.entry, field_name_length); i >= 0; ) {
1252                                         if(!FLAC__metadata_object_vorbiscomment_delete_comment(object, (unsigned)i))
1253                                                 return false;
1254                                         if((unsigned)i < object->data.vorbis_comment.num_comments)
1255                                                 i = vorbiscomment_find_entry_from_(object, (unsigned)i, (const char *)entry.entry, field_name_length);
1256                                         else
1257                                                 i = -1;
1258                                 }
1259                         }
1260                         return true;
1261                 }
1262                 else
1263                         return FLAC__metadata_object_vorbiscomment_append_comment(object, entry, copy);
1264         }
1265 }
1266
1267 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_delete_comment(FLAC__StreamMetadata *object, unsigned comment_num)
1268 {
1269         FLAC__StreamMetadata_VorbisComment *vc;
1270
1271         FLAC__ASSERT(0 != object);
1272         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1273         FLAC__ASSERT(comment_num < object->data.vorbis_comment.num_comments);
1274
1275         vc = &object->data.vorbis_comment;
1276
1277         /* free the comment at comment_num */
1278         if(0 != vc->comments[comment_num].entry)
1279                 free(vc->comments[comment_num].entry);
1280
1281         /* move all comments > comment_num backward one space */
1282         memmove(&vc->comments[comment_num], &vc->comments[comment_num+1], sizeof(FLAC__StreamMetadata_VorbisComment_Entry)*(vc->num_comments-comment_num-1));
1283         vc->comments[vc->num_comments-1].length = 0;
1284         vc->comments[vc->num_comments-1].entry = 0;
1285
1286         return FLAC__metadata_object_vorbiscomment_resize_comments(object, vc->num_comments-1);
1287 }
1288
1289 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(FLAC__StreamMetadata_VorbisComment_Entry *entry, const char *field_name, const char *field_value)
1290 {
1291         FLAC__ASSERT(0 != entry);
1292         FLAC__ASSERT(0 != field_name);
1293         FLAC__ASSERT(0 != field_value);
1294
1295         if(!FLAC__format_vorbiscomment_entry_name_is_legal(field_name))
1296                 return false;
1297         if(!FLAC__format_vorbiscomment_entry_value_is_legal((const FLAC__byte *)field_value, (unsigned)(-1)))
1298                 return false;
1299
1300         {
1301                 const size_t nn = strlen(field_name);
1302                 const size_t nv = strlen(field_value);
1303                 entry->length = nn + 1 /*=*/ + nv;
1304                 if(0 == (entry->entry = (FLAC__byte*)malloc(entry->length+1)))
1305                         return false;
1306                 memcpy(entry->entry, field_name, nn);
1307                 entry->entry[nn] = '=';
1308                 memcpy(entry->entry+nn+1, field_value, nv);
1309                 entry->entry[entry->length] = '\0';
1310         }
1311
1312         return true;
1313 }
1314
1315 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_to_name_value_pair(const FLAC__StreamMetadata_VorbisComment_Entry entry, char **field_name, char **field_value)
1316 {
1317         FLAC__ASSERT(0 != entry.entry && entry.length > 0);
1318         FLAC__ASSERT(0 != field_name);
1319         FLAC__ASSERT(0 != field_value);
1320
1321         if(!FLAC__format_vorbiscomment_entry_is_legal(entry.entry, entry.length))
1322                 return false;
1323
1324         {
1325                 const FLAC__byte *eq = (FLAC__byte*)memchr(entry.entry, '=', entry.length);
1326                 const size_t nn = eq-entry.entry;
1327                 const size_t nv = entry.length-nn-1; /* -1 for the '=' */
1328                 FLAC__ASSERT(0 != eq);
1329                 if(0 == eq)
1330                         return false; /* double protection */
1331                 if(0 == (*field_name = (char*)malloc(nn+1)))
1332                         return false;
1333                 if(0 == (*field_value = (char*)malloc(nv+1))) {
1334                         free(*field_name);
1335                         return false;
1336                 }
1337                 memcpy(*field_name, entry.entry, nn);
1338                 memcpy(*field_value, entry.entry+nn+1, nv);
1339                 (*field_name)[nn] = '\0';
1340                 (*field_value)[nv] = '\0';
1341         }
1342
1343         return true;
1344 }
1345
1346 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_matches(const FLAC__StreamMetadata_VorbisComment_Entry entry, const char *field_name, unsigned field_name_length)
1347 {
1348         FLAC__ASSERT(0 != entry.entry && entry.length > 0);
1349         {
1350                 const FLAC__byte *eq = (FLAC__byte*)memchr(entry.entry, '=', entry.length);
1351 #if defined _MSC_VER || defined __MINGW32__ || defined __EMX__
1352 #define FLAC__STRNCASECMP strnicmp
1353 #else
1354 #define FLAC__STRNCASECMP strncasecmp
1355 #endif
1356                 return (0 != eq && (unsigned)(eq-entry.entry) == field_name_length && 0 == FLAC__STRNCASECMP(field_name, (const char *)entry.entry, field_name_length));
1357 #undef FLAC__STRNCASECMP
1358         }
1359 }
1360
1361 FLAC_API int FLAC__metadata_object_vorbiscomment_find_entry_from(const FLAC__StreamMetadata *object, unsigned offset, const char *field_name)
1362 {
1363         FLAC__ASSERT(0 != field_name);
1364
1365         return vorbiscomment_find_entry_from_(object, offset, field_name, strlen(field_name));
1366 }
1367
1368 FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entry_matching(FLAC__StreamMetadata *object, const char *field_name)
1369 {
1370         const unsigned field_name_length = strlen(field_name);
1371         unsigned i;
1372
1373         FLAC__ASSERT(0 != object);
1374         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1375
1376         for(i = 0; i < object->data.vorbis_comment.num_comments; i++) {
1377                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments[i], field_name, field_name_length)) {
1378                         if(!FLAC__metadata_object_vorbiscomment_delete_comment(object, i))
1379                                 return -1;
1380                         else
1381                                 return 1;
1382                 }
1383         }
1384
1385         return 0;
1386 }
1387
1388 FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entries_matching(FLAC__StreamMetadata *object, const char *field_name)
1389 {
1390         FLAC__bool ok = true;
1391         unsigned matching = 0;
1392         const unsigned field_name_length = strlen(field_name);
1393         int i;
1394
1395         FLAC__ASSERT(0 != object);
1396         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1397
1398         /* must delete from end to start otherwise it will interfere with our iteration */
1399         for(i = (int)object->data.vorbis_comment.num_comments - 1; ok && i >= 0; i--) {
1400                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments[i], field_name, field_name_length)) {
1401                         matching++;
1402                         ok &= FLAC__metadata_object_vorbiscomment_delete_comment(object, (unsigned)i);
1403                 }
1404         }
1405
1406         return ok? (int)matching : -1;
1407 }
1408
1409 FLAC_API FLAC__StreamMetadata_CueSheet_Track *FLAC__metadata_object_cuesheet_track_new()
1410 {
1411         return (FLAC__StreamMetadata_CueSheet_Track*)calloc(1, sizeof(FLAC__StreamMetadata_CueSheet_Track));
1412 }
1413
1414 FLAC_API FLAC__StreamMetadata_CueSheet_Track *FLAC__metadata_object_cuesheet_track_clone(const FLAC__StreamMetadata_CueSheet_Track *object)
1415 {
1416         FLAC__StreamMetadata_CueSheet_Track *to;
1417
1418         FLAC__ASSERT(0 != object);
1419
1420         if(0 != (to = FLAC__metadata_object_cuesheet_track_new())) {
1421                 if(!copy_track_(to, object)) {
1422                         FLAC__metadata_object_cuesheet_track_delete(to);
1423                         return 0;
1424                 }
1425         }
1426
1427         return to;
1428 }
1429
1430 void FLAC__metadata_object_cuesheet_track_delete_data(FLAC__StreamMetadata_CueSheet_Track *object)
1431 {
1432         FLAC__ASSERT(0 != object);
1433
1434         if(0 != object->indices) {
1435                 FLAC__ASSERT(object->num_indices > 0);
1436                 free(object->indices);
1437         }
1438 }
1439
1440 FLAC_API void FLAC__metadata_object_cuesheet_track_delete(FLAC__StreamMetadata_CueSheet_Track *object)
1441 {
1442         FLAC__metadata_object_cuesheet_track_delete_data(object);
1443         free(object);
1444 }
1445
1446 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_resize_indices(FLAC__StreamMetadata *object, unsigned track_num, unsigned new_num_indices)
1447 {
1448         FLAC__StreamMetadata_CueSheet_Track *track;
1449         FLAC__ASSERT(0 != object);
1450         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1451         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1452
1453         track = &object->data.cue_sheet.tracks[track_num];
1454
1455         if(0 == track->indices) {
1456                 FLAC__ASSERT(track->num_indices == 0);
1457                 if(0 == new_num_indices)
1458                         return true;
1459                 else if(0 == (track->indices = cuesheet_track_index_array_new_(new_num_indices)))
1460                         return false;
1461         }
1462         else {
1463                 const unsigned old_size = track->num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index);
1464                 const unsigned new_size = new_num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index);
1465
1466                 FLAC__ASSERT(track->num_indices > 0);
1467
1468                 if(new_size == 0) {
1469                         free(track->indices);
1470                         track->indices = 0;
1471                 }
1472                 else if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)realloc(track->indices, new_size)))
1473                         return false;
1474
1475                 /* if growing, zero all the lengths/pointers of new elements */
1476                 if(new_size > old_size)
1477                         memset(track->indices + track->num_indices, 0, new_size - old_size);
1478         }
1479
1480         track->num_indices = new_num_indices;
1481
1482         cuesheet_calculate_length_(object);
1483         return true;
1484 }
1485
1486 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)
1487 {
1488         FLAC__StreamMetadata_CueSheet_Track *track;
1489
1490         FLAC__ASSERT(0 != object);
1491         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1492         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1493         FLAC__ASSERT(index_num <= object->data.cue_sheet.tracks[track_num].num_indices);
1494
1495         track = &object->data.cue_sheet.tracks[track_num];
1496
1497         if(!FLAC__metadata_object_cuesheet_track_resize_indices(object, track_num, track->num_indices+1))
1498                 return false;
1499
1500         /* move all indices >= index_num forward one space */
1501         memmove(&track->indices[index_num+1], &track->indices[index_num], sizeof(FLAC__StreamMetadata_CueSheet_Index)*(track->num_indices-1-index_num));
1502
1503         track->indices[index_num] = index;
1504         cuesheet_calculate_length_(object);
1505         return true;
1506 }
1507
1508 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_insert_blank_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num)
1509 {
1510         FLAC__StreamMetadata_CueSheet_Index index;
1511         memset(&index, 0, sizeof(index));
1512         return FLAC__metadata_object_cuesheet_track_insert_index(object, track_num, index_num, index);
1513 }
1514
1515 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_delete_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num)
1516 {
1517         FLAC__StreamMetadata_CueSheet_Track *track;
1518
1519         FLAC__ASSERT(0 != object);
1520         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1521         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1522         FLAC__ASSERT(index_num < object->data.cue_sheet.tracks[track_num].num_indices);
1523
1524         track = &object->data.cue_sheet.tracks[track_num];
1525
1526         /* move all indices > index_num backward one space */
1527         memmove(&track->indices[index_num], &track->indices[index_num+1], sizeof(FLAC__StreamMetadata_CueSheet_Index)*(track->num_indices-index_num-1));
1528
1529         FLAC__metadata_object_cuesheet_track_resize_indices(object, track_num, track->num_indices-1);
1530         cuesheet_calculate_length_(object);
1531         return true;
1532 }
1533
1534 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_resize_tracks(FLAC__StreamMetadata *object, unsigned new_num_tracks)
1535 {
1536         FLAC__ASSERT(0 != object);
1537         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1538
1539         if(0 == object->data.cue_sheet.tracks) {
1540                 FLAC__ASSERT(object->data.cue_sheet.num_tracks == 0);
1541                 if(0 == new_num_tracks)
1542                         return true;
1543                 else if(0 == (object->data.cue_sheet.tracks = cuesheet_track_array_new_(new_num_tracks)))
1544                         return false;
1545         }
1546         else {
1547                 const unsigned old_size = object->data.cue_sheet.num_tracks * sizeof(FLAC__StreamMetadata_CueSheet_Track);
1548                 const unsigned new_size = new_num_tracks * sizeof(FLAC__StreamMetadata_CueSheet_Track);
1549
1550                 FLAC__ASSERT(object->data.cue_sheet.num_tracks > 0);
1551
1552                 /* if shrinking, free the truncated entries */
1553                 if(new_num_tracks < object->data.cue_sheet.num_tracks) {
1554                         unsigned i;
1555                         for(i = new_num_tracks; i < object->data.cue_sheet.num_tracks; i++)
1556                                 if(0 != object->data.cue_sheet.tracks[i].indices)
1557                                         free(object->data.cue_sheet.tracks[i].indices);
1558                 }
1559
1560                 if(new_size == 0) {
1561                         free(object->data.cue_sheet.tracks);
1562                         object->data.cue_sheet.tracks = 0;
1563                 }
1564                 else if(0 == (object->data.cue_sheet.tracks = (FLAC__StreamMetadata_CueSheet_Track*)realloc(object->data.cue_sheet.tracks, new_size)))
1565                         return false;
1566
1567                 /* if growing, zero all the lengths/pointers of new elements */
1568                 if(new_size > old_size)
1569                         memset(object->data.cue_sheet.tracks + object->data.cue_sheet.num_tracks, 0, new_size - old_size);
1570         }
1571
1572         object->data.cue_sheet.num_tracks = new_num_tracks;
1573
1574         cuesheet_calculate_length_(object);
1575         return true;
1576 }
1577
1578 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_set_track(FLAC__StreamMetadata *object, unsigned track_num, FLAC__StreamMetadata_CueSheet_Track *track, FLAC__bool copy)
1579 {
1580         FLAC__ASSERT(0 != object);
1581         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1582
1583         return cuesheet_set_track_(object, object->data.cue_sheet.tracks + track_num, track, copy);
1584 }
1585
1586 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_insert_track(FLAC__StreamMetadata *object, unsigned track_num, FLAC__StreamMetadata_CueSheet_Track *track, FLAC__bool copy)
1587 {
1588         FLAC__StreamMetadata_CueSheet *cs;
1589
1590         FLAC__ASSERT(0 != object);
1591         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1592         FLAC__ASSERT(track_num <= object->data.cue_sheet.num_tracks);
1593
1594         cs = &object->data.cue_sheet;
1595
1596         if(!FLAC__metadata_object_cuesheet_resize_tracks(object, cs->num_tracks+1))
1597                 return false;
1598
1599         /* move all tracks >= track_num forward one space */
1600         memmove(&cs->tracks[track_num+1], &cs->tracks[track_num], sizeof(FLAC__StreamMetadata_CueSheet_Track)*(cs->num_tracks-1-track_num));
1601         cs->tracks[track_num].num_indices = 0;
1602         cs->tracks[track_num].indices = 0;
1603
1604         return FLAC__metadata_object_cuesheet_set_track(object, track_num, track, copy);
1605 }
1606
1607 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_insert_blank_track(FLAC__StreamMetadata *object, unsigned track_num)
1608 {
1609         FLAC__StreamMetadata_CueSheet_Track track;
1610         memset(&track, 0, sizeof(track));
1611         return FLAC__metadata_object_cuesheet_insert_track(object, track_num, &track, /*copy=*/false);
1612 }
1613
1614 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_delete_track(FLAC__StreamMetadata *object, unsigned track_num)
1615 {
1616         FLAC__StreamMetadata_CueSheet *cs;
1617
1618         FLAC__ASSERT(0 != object);
1619         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1620         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1621
1622         cs = &object->data.cue_sheet;
1623
1624         /* free the track at track_num */
1625         if(0 != cs->tracks[track_num].indices)
1626                 free(cs->tracks[track_num].indices);
1627
1628         /* move all tracks > track_num backward one space */
1629         memmove(&cs->tracks[track_num], &cs->tracks[track_num+1], sizeof(FLAC__StreamMetadata_CueSheet_Track)*(cs->num_tracks-track_num-1));
1630         cs->tracks[cs->num_tracks-1].num_indices = 0;
1631         cs->tracks[cs->num_tracks-1].indices = 0;
1632
1633         return FLAC__metadata_object_cuesheet_resize_tracks(object, cs->num_tracks-1);
1634 }
1635
1636 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_is_legal(const FLAC__StreamMetadata *object, FLAC__bool check_cd_da_subset, const char **violation)
1637 {
1638         FLAC__ASSERT(0 != object);
1639         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1640
1641         return FLAC__format_cuesheet_is_legal(&object->data.cue_sheet, check_cd_da_subset, violation);
1642 }
1643
1644 static FLAC__uint64 get_index_01_offset_(const FLAC__StreamMetadata_CueSheet *cs, unsigned track)
1645 {
1646         if (track >= (cs->num_tracks-1) || cs->tracks[track].num_indices < 1)
1647                 return 0;
1648         else if (cs->tracks[track].indices[0].number == 1)
1649                 return cs->tracks[track].indices[0].offset + cs->tracks[track].offset + cs->lead_in;
1650         else if (cs->tracks[track].num_indices < 2)
1651                 return 0;
1652         else if (cs->tracks[track].indices[1].number == 1)
1653                 return cs->tracks[track].indices[1].offset + cs->tracks[track].offset + cs->lead_in;
1654         else
1655                 return 0;
1656 }
1657
1658 static FLAC__uint32 cddb_add_digits_(FLAC__uint32 x)
1659 {
1660         FLAC__uint32 n = 0;
1661         while (x) {
1662                 n += (x%10);
1663                 x /= 10;
1664         }
1665         return n;
1666 }
1667
1668 FLAC_API FLAC__uint32 FLAC__metadata_object_cuesheet_calculate_cddb_id(const FLAC__StreamMetadata *object)
1669 {
1670         const FLAC__StreamMetadata_CueSheet *cs;
1671
1672         FLAC__ASSERT(0 != object);
1673         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1674
1675         cs = &object->data.cue_sheet;
1676
1677         if (cs->num_tracks < 2) /* need at least one real track and the lead-out track */
1678                 return 0;
1679
1680         {
1681                 FLAC__uint32 i, length, sum = 0;
1682                 for (i = 0; i < (cs->num_tracks-1); i++) /* -1 to avoid counting the lead-out */
1683                         sum += cddb_add_digits_((FLAC__uint32)(get_index_01_offset_(cs, i) / 44100));
1684                 length = (FLAC__uint32)((cs->tracks[cs->num_tracks-1].offset+cs->lead_in) / 44100) - (FLAC__uint32)(get_index_01_offset_(cs, 0) / 44100);
1685
1686                 return (sum % 0xFF) << 24 | length << 8 | (FLAC__uint32)(cs->num_tracks-1);
1687         }
1688 }
1689
1690 FLAC_API FLAC__bool FLAC__metadata_object_picture_set_mime_type(FLAC__StreamMetadata *object, char *mime_type, FLAC__bool copy)
1691 {
1692         char *old;
1693         size_t old_length, new_length;
1694
1695         FLAC__ASSERT(0 != object);
1696         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_PICTURE);
1697         FLAC__ASSERT(0 != mime_type);
1698
1699         old = object->data.picture.mime_type;
1700         old_length = old? strlen(old) : 0;
1701         new_length = strlen(mime_type);
1702
1703         /* do the copy first so that if we fail we leave the object untouched */
1704         if(copy) {
1705                 if(!copy_bytes_((FLAC__byte**)(&object->data.picture.mime_type), (FLAC__byte*)mime_type, new_length+1))
1706                         return false;
1707         }
1708         else {
1709                 object->data.picture.mime_type = mime_type;
1710         }
1711
1712         if(0 != old)
1713                 free(old);
1714
1715         object->length -= old_length;
1716         object->length += new_length;
1717         return true;
1718 }
1719
1720 FLAC_API FLAC__bool FLAC__metadata_object_picture_set_description(FLAC__StreamMetadata *object, FLAC__byte *description, FLAC__bool copy)
1721 {
1722         FLAC__byte *old;
1723         size_t old_length, new_length;
1724
1725         FLAC__ASSERT(0 != object);
1726         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_PICTURE);
1727         FLAC__ASSERT(0 != description);
1728
1729         old = object->data.picture.description;
1730         old_length = old? strlen((const char *)old) : 0;
1731         new_length = strlen((const char *)description);
1732
1733         /* do the copy first so that if we fail we leave the object untouched */
1734         if(copy) {
1735                 if(!copy_bytes_(&object->data.picture.description, description, new_length+1))
1736                         return false;
1737         }
1738         else {
1739                 object->data.picture.description = description;
1740         }
1741
1742         if(0 != old)
1743                 free(old);
1744
1745         object->length -= old_length;
1746         object->length += new_length;
1747         return true;
1748 }
1749
1750 FLAC_API FLAC__bool FLAC__metadata_object_picture_set_data(FLAC__StreamMetadata *object, FLAC__byte *data, FLAC__uint32 length, FLAC__bool copy)
1751 {
1752         FLAC__byte *old;
1753
1754         FLAC__ASSERT(0 != object);
1755         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_PICTURE);
1756         FLAC__ASSERT((0 != data && length > 0) || (0 == data && length == 0 && copy == false));
1757
1758         old = object->data.picture.data;
1759
1760         /* do the copy first so that if we fail we leave the object untouched */
1761         if(copy) {
1762                 if(!copy_bytes_(&object->data.picture.data, data, length))
1763                         return false;
1764         }
1765         else {
1766                 object->data.picture.data = data;
1767         }
1768
1769         if(0 != old)
1770                 free(old);
1771
1772         object->length -= object->data.picture.data_length;
1773         object->data.picture.data_length = length;
1774         object->length += length;
1775         return true;
1776 }
1777
1778 FLAC_API FLAC__bool FLAC__metadata_object_picture_is_legal(const FLAC__StreamMetadata *object, const char **violation)
1779 {
1780         FLAC__ASSERT(0 != object);
1781         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_PICTURE);
1782
1783         return FLAC__format_picture_is_legal(&object->data.picture, violation);
1784 }