src/libFLAC/metadata_object.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2001,2002,2003,2004,2005,2006,2007,2008  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 #include "share/alloc.h"
  43
  44
  45 /****************************************************************************
  46  *
  47  * Local routines
  48  *
  49  ***************************************************************************/
  50
  51 /* copy bytes:
  52  *  from = NULL  && bytes = 0
  53  *       to <- NULL
  54  *  from != NULL && bytes > 0
  55  *       to <- copy of from
  56  *  else ASSERT
  57  * malloc error leaves 'to' unchanged
  58  */
  59 static FLAC__bool copy_bytes_(FLAC__byte **to, const FLAC__byte *from, unsigned bytes)
  60 {
  61         FLAC__ASSERT(0 != to);
  62         if(bytes > 0 && 0 != from) {
  63                 FLAC__byte *x;
  64                 if(0 == (x = (FLAC__byte*)safe_malloc_(bytes)))
  65                         return false;
  66                 memcpy(x, from, bytes);
  67                 *to = x;
  68         }
  69         else {
  70                 FLAC__ASSERT(0 == from);
  71                 FLAC__ASSERT(bytes == 0);
  72                 *to = 0;
  73         }
  74         return true;
  75 }
  76
  77 #if 0 /* UNUSED */
  78 /* like copy_bytes_(), but free()s the original '*to' if the copy succeeds and the original '*to' is non-NULL */
  79 static FLAC__bool free_copy_bytes_(FLAC__byte **to, const FLAC__byte *from, unsigned bytes)
  80 {
  81         FLAC__byte *copy;
  82         FLAC__ASSERT(0 != to);
  83         if(copy_bytes_(&copy, from, bytes)) {
  84                 if(*to)
  85                         free(*to);
  86                 *to = copy;
  87                 return true;
  88         }
  89         else
  90                 return false;
  91 }
  92 #endif
  93
  94 /* reallocate entry to 1 byte larger and add a terminating NUL */
  95 /* realloc() failure leaves entry unchanged */
  96 static FLAC__bool ensure_null_terminated_(FLAC__byte **entry, unsigned length)
  97 {
  98         FLAC__byte *x = (FLAC__byte*)safe_realloc_add_2op_(*entry, length, /*+*/1);
  99         if(0 != x) {
 100                 x[length] = '\0';
 101                 *entry = x;
 102                 return true;
 103         }
 104         else
 105                 return false;
 106 }
 107
 108 /* copies the NUL-terminated C-string 'from' to '*to', leaving '*to'
 109  * unchanged if malloc fails, free()ing the original '*to' if it
 110  * succeeds and the original '*to' was not NULL
 111  */
 112 static FLAC__bool copy_cstring_(char **to, const char *from)
 113 {
 114         char *copy = strdup(from);
 115         FLAC__ASSERT(to);
 116         if(copy) {
 117                 if(*to)
 118                         free(*to);
 119                 *to = copy;
 120                 return true;
 121         }
 122         else
 123                 return false;
 124 }
 125
 126 static FLAC__bool copy_vcentry_(FLAC__StreamMetadata_VorbisComment_Entry *to, const FLAC__StreamMetadata_VorbisComment_Entry *from)
 127 {
 128         to->length = from->length;
 129         if(0 == from->entry) {
 130                 FLAC__ASSERT(from->length == 0);
 131                 to->entry = 0;
 132         }
 133         else {
 134                 FLAC__byte *x;
 135                 FLAC__ASSERT(from->length > 0);
 136                 if(0 == (x = (FLAC__byte*)safe_malloc_add_2op_(from->length, /*+*/1)))
 137                         return false;
 138                 memcpy(x, from->entry, from->length);
 139                 x[from->length] = '\0';
 140                 to->entry = x;
 141         }
 142         return true;
 143 }
 144
 145 static FLAC__bool copy_track_(FLAC__StreamMetadata_CueSheet_Track *to, const FLAC__StreamMetadata_CueSheet_Track *from)
 146 {
 147         memcpy(to, from, sizeof(FLAC__StreamMetadata_CueSheet_Track));
 148         if(0 == from->indices) {
 149                 FLAC__ASSERT(from->num_indices == 0);
 150         }
 151         else {
 152                 FLAC__StreamMetadata_CueSheet_Index *x;
 153                 FLAC__ASSERT(from->num_indices > 0);
 154                 if(0 == (x = (FLAC__StreamMetadata_CueSheet_Index*)safe_malloc_mul_2op_(from->num_indices, /*times*/sizeof(FLAC__StreamMetadata_CueSheet_Index))))
 155                         return false;
 156                 memcpy(x, from->indices, from->num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index));
 157                 to->indices = x;
 158         }
 159         return true;
 160 }
 161
 162 static void seektable_calculate_length_(FLAC__StreamMetadata *object)
 163 {
 164         FLAC__ASSERT(0 != object);
 165         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 166
 167         object->length = object->data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
 168 }
 169
 170 static FLAC__StreamMetadata_SeekPoint *seekpoint_array_new_(unsigned num_points)
 171 {
 172         FLAC__StreamMetadata_SeekPoint *object_array;
 173
 174         FLAC__ASSERT(num_points > 0);
 175
 176         object_array = (FLAC__StreamMetadata_SeekPoint*)safe_malloc_mul_2op_(num_points, /*times*/sizeof(FLAC__StreamMetadata_SeekPoint));
 177
 178         if(0 != object_array) {
 179                 unsigned i;
 180                 for(i = 0; i < num_points; i++) {
 181                         object_array[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
 182                         object_array[i].stream_offset = 0;
 183                         object_array[i].frame_samples = 0;
 184                 }
 185         }
 186
 187         return object_array;
 188 }
 189
 190 static void vorbiscomment_calculate_length_(FLAC__StreamMetadata *object)
 191 {
 192         unsigned i;
 193
 194         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 195
 196         object->length = (FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN) / 8;
 197         object->length += object->data.vorbis_comment.vendor_string.length;
 198         object->length += (FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8;
 199         for(i = 0; i < object->data.vorbis_comment.num_comments; i++) {
 200                 object->length += (FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8);
 201                 object->length += object->data.vorbis_comment.comments[i].length;
 202         }
 203 }
 204
 205 static FLAC__StreamMetadata_VorbisComment_Entry *vorbiscomment_entry_array_new_(unsigned num_comments)
 206 {
 207         FLAC__ASSERT(num_comments > 0);
 208
 209         return (FLAC__StreamMetadata_VorbisComment_Entry*)safe_calloc_(num_comments, sizeof(FLAC__StreamMetadata_VorbisComment_Entry));
 210 }
 211
 212 static void vorbiscomment_entry_array_delete_(FLAC__StreamMetadata_VorbisComment_Entry *object_array, unsigned num_comments)
 213 {
 214         unsigned i;
 215
 216         FLAC__ASSERT(0 != object_array && num_comments > 0);
 217
 218         for(i = 0; i < num_comments; i++)
 219                 if(0 != object_array[i].entry)
 220                         free(object_array[i].entry);
 221
 222         if(0 != object_array)
 223                 free(object_array);
 224 }
 225
 226 static FLAC__StreamMetadata_VorbisComment_Entry *vorbiscomment_entry_array_copy_(const FLAC__StreamMetadata_VorbisComment_Entry *object_array, unsigned num_comments)
 227 {
 228         FLAC__StreamMetadata_VorbisComment_Entry *return_array;
 229
 230         FLAC__ASSERT(0 != object_array);
 231         FLAC__ASSERT(num_comments > 0);
 232
 233         return_array = vorbiscomment_entry_array_new_(num_comments);
 234
 235         if(0 != return_array) {
 236                 unsigned i;
 237
 238                 for(i = 0; i < num_comments; i++) {
 239                         if(!copy_vcentry_(return_array+i, object_array+i)) {
 240                                 vorbiscomment_entry_array_delete_(return_array, num_comments);
 241                                 return 0;
 242                         }
 243                 }
 244         }
 245
 246         return return_array;
 247 }
 248
 249 static FLAC__bool vorbiscomment_set_entry_(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry *dest, const FLAC__StreamMetadata_VorbisComment_Entry *src, FLAC__bool copy)
 250 {
 251         FLAC__byte *save;
 252
 253         FLAC__ASSERT(0 != object);
 254         FLAC__ASSERT(0 != dest);
 255         FLAC__ASSERT(0 != src);
 256         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 257         FLAC__ASSERT((0 != src->entry && src->length > 0) || (0 == src->entry && src->length == 0));
 258
 259         save = dest->entry;
 260
 261         if(0 != src->entry && src->length > 0) {
 262                 if(copy) {
 263                         /* do the copy first so that if we fail we leave the dest object untouched */
 264                         if(!copy_vcentry_(dest, src))
 265                                 return false;
 266                 }
 267                 else {
 268                         /* we have to make sure that the string we're taking over is null-terminated */
 269
 270                         /*
 271                          * Stripping the const from src->entry is OK since we're taking
 272                          * ownership of the pointer.  This is a hack around a deficiency
 273                          * in the API where the same function is used for 'copy' and
 274                          * 'own', but the source entry is a const pointer.  If we were
 275                          * precise, the 'own' flavor would be a separate function with a
 276                          * non-const source pointer.  But it's not, so we hack away.
 277                          */
 278                         if(!ensure_null_terminated_((FLAC__byte**)(&src->entry), src->length))
 279                                 return false;
 280                         *dest = *src;
 281                 }
 282         }
 283         else {
 284                 /* the src is null */
 285                 *dest = *src;
 286         }
 287
 288         if(0 != save)
 289                 free(save);
 290
 291         vorbiscomment_calculate_length_(object);
 292         return true;
 293 }
 294
 295 static int vorbiscomment_find_entry_from_(const FLAC__StreamMetadata *object, unsigned offset, const char *field_name, unsigned field_name_length)
 296 {
 297         unsigned i;
 298
 299         FLAC__ASSERT(0 != object);
 300         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
 301         FLAC__ASSERT(0 != field_name);
 302
 303         for(i = offset; i < object->data.vorbis_comment.num_comments; i++) {
 304                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments[i], field_name, field_name_length))
 305                         return (int)i;
 306         }
 307
 308         return -1;
 309 }
 310
 311 static void cuesheet_calculate_length_(FLAC__StreamMetadata *object)
 312 {
 313         unsigned i;
 314
 315         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
 316
 317         object->length = (
 318                 FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN +
 319                 FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN +
 320                 FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN +
 321                 FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN +
 322                 FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN
 323         ) / 8;
 324
 325         object->length += object->data.cue_sheet.num_tracks * (
 326                 FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN +
 327                 FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN +
 328                 FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN +
 329                 FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN +
 330                 FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN +
 331                 FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN +
 332                 FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN
 333         ) / 8;
 334
 335         for(i = 0; i < object->data.cue_sheet.num_tracks; i++) {
 336                 object->length += object->data.cue_sheet.tracks[i].num_indices * (
 337                         FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN +
 338                         FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN +
 339                         FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN
 340                 ) / 8;
 341         }
 342 }
 343
 344 static FLAC__StreamMetadata_CueSheet_Index *cuesheet_track_index_array_new_(unsigned num_indices)
 345 {
 346         FLAC__ASSERT(num_indices > 0);
 347
 348         return (FLAC__StreamMetadata_CueSheet_Index*)safe_calloc_(num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index));
 349 }
 350
 351 static FLAC__StreamMetadata_CueSheet_Track *cuesheet_track_array_new_(unsigned num_tracks)
 352 {
 353         FLAC__ASSERT(num_tracks > 0);
 354
 355         return (FLAC__StreamMetadata_CueSheet_Track*)safe_calloc_(num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track));
 356 }
 357
 358 static void cuesheet_track_array_delete_(FLAC__StreamMetadata_CueSheet_Track *object_array, unsigned num_tracks)
 359 {
 360         unsigned i;
 361
 362         FLAC__ASSERT(0 != object_array && num_tracks > 0);
 363
 364         for(i = 0; i < num_tracks; i++) {
 365                 if(0 != object_array[i].indices) {
 366                         FLAC__ASSERT(object_array[i].num_indices > 0);
 367                         free(object_array[i].indices);
 368                 }
 369         }
 370
 371         if(0 != object_array)
 372                 free(object_array);
 373 }
 374
 375 static FLAC__StreamMetadata_CueSheet_Track *cuesheet_track_array_copy_(const FLAC__StreamMetadata_CueSheet_Track *object_array, unsigned num_tracks)
 376 {
 377         FLAC__StreamMetadata_CueSheet_Track *return_array;
 378
 379         FLAC__ASSERT(0 != object_array);
 380         FLAC__ASSERT(num_tracks > 0);
 381
 382         return_array = cuesheet_track_array_new_(num_tracks);
 383
 384         if(0 != return_array) {
 385                 unsigned i;
 386
 387                 for(i = 0; i < num_tracks; i++) {
 388                         if(!copy_track_(return_array+i, object_array+i)) {
 389                                 cuesheet_track_array_delete_(return_array, num_tracks);
 390                                 return 0;
 391                         }
 392                 }
 393         }
 394
 395         return return_array;
 396 }
 397
 398 static FLAC__bool cuesheet_set_track_(FLAC__StreamMetadata *object, FLAC__StreamMetadata_CueSheet_Track *dest, const FLAC__StreamMetadata_CueSheet_Track *src, FLAC__bool copy)
 399 {
 400         FLAC__StreamMetadata_CueSheet_Index *save;
 401
 402         FLAC__ASSERT(0 != object);
 403         FLAC__ASSERT(0 != dest);
 404         FLAC__ASSERT(0 != src);
 405         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
 406         FLAC__ASSERT((0 != src->indices && src->num_indices > 0) || (0 == src->indices && src->num_indices == 0));
 407
 408         save = dest->indices;
 409
 410         /* do the copy first so that if we fail we leave the object untouched */
 411         if(copy) {
 412                 if(!copy_track_(dest, src))
 413                         return false;
 414         }
 415         else {
 416                 *dest = *src;
 417         }
 418
 419         if(0 != save)
 420                 free(save);
 421
 422         cuesheet_calculate_length_(object);
 423         return true;
 424 }
 425
 426
 427 /****************************************************************************
 428  *
 429  * Metadata object routines
 430  *
 431  ***************************************************************************/
 432
 433 FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_new(FLAC__MetadataType type)
 434 {
 435         FLAC__StreamMetadata *object;
 436
 437         if(type > FLAC__MAX_METADATA_TYPE_CODE)
 438                 return 0;
 439
 440         object = (FLAC__StreamMetadata*)calloc(1, sizeof(FLAC__StreamMetadata));
 441         if(0 != object) {
 442                 object->is_last = false;
 443                 object->type = type;
 444                 switch(type) {
 445                         case FLAC__METADATA_TYPE_STREAMINFO:
 446                                 object->length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
 447                                 break;
 448                         case FLAC__METADATA_TYPE_PADDING:
 449                                 /* calloc() took care of this for us:
 450                                 object->length = 0;
 451                                 */
 452                                 break;
 453                         case FLAC__METADATA_TYPE_APPLICATION:
 454                                 object->length = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
 455                                 /* calloc() took care of this for us:
 456                                 object->data.application.data = 0;
 457                                 */
 458                                 break;
 459                         case FLAC__METADATA_TYPE_SEEKTABLE:
 460                                 /* calloc() took care of this for us:
 461                                 object->length = 0;
 462                                 object->data.seek_table.num_points = 0;
 463                                 object->data.seek_table.points = 0;
 464                                 */
 465                                 break;
 466                         case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 467                                 object->data.vorbis_comment.vendor_string.length = (unsigned)strlen(FLAC__VENDOR_STRING);
 468                                 if(!copy_bytes_(&object->data.vorbis_comment.vendor_string.entry, (const FLAC__byte*)FLAC__VENDOR_STRING, object->data.vorbis_comment.vendor_string.length+1)) {
 469                                         free(object);
 470                                         return 0;
 471                                 }
 472                                 vorbiscomment_calculate_length_(object);
 473                                 break;
 474                         case FLAC__METADATA_TYPE_CUESHEET:
 475                                 cuesheet_calculate_length_(object);
 476                                 break;
 477                         case FLAC__METADATA_TYPE_PICTURE:
 478                                 object->length = (
 479                                         FLAC__STREAM_METADATA_PICTURE_TYPE_LEN +
 480                                         FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN + /* empty mime_type string */
 481                                         FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN + /* empty description string */
 482                                         FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN +
 483                                         FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN +
 484                                         FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN +
 485                                         FLAC__STREAM_METADATA_PICTURE_COLORS_LEN +
 486                                         FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN +
 487                                         0 /* no data */
 488                                 ) / 8;
 489                                 object->data.picture.type = FLAC__STREAM_METADATA_PICTURE_TYPE_OTHER;
 490                                 object->data.picture.mime_type = 0;
 491                                 object->data.picture.description = 0;
 492                                 /* calloc() took care of this for us:
 493                                 object->data.picture.width = 0;
 494                                 object->data.picture.height = 0;
 495                                 object->data.picture.depth = 0;
 496                                 object->data.picture.colors = 0;
 497                                 object->data.picture.data_length = 0;
 498                                 object->data.picture.data = 0;
 499                                 */
 500                                 /* now initialize mime_type and description with empty strings to make things easier on the client */
 501                                 if(!copy_cstring_(&object->data.picture.mime_type, "")) {
 502                                         free(object);
 503                                         return 0;
 504                                 }
 505                                 if(!copy_cstring_((char**)(&object->data.picture.description), "")) {
 506                                         if(object->data.picture.mime_type)
 507                                                 free(object->data.picture.mime_type);
 508                                         free(object);
 509                                         return 0;
 510                                 }
 511                                 break;
 512                         default:
 513                                 /* calloc() took care of this for us:
 514                                 object->length = 0;
 515                                 object->data.unknown.data = 0;
 516                                 */
 517                                 break;
 518                 }
 519         }
 520
 521         return object;
 522 }
 523
 524 FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_clone(const FLAC__StreamMetadata *object)
 525 {
 526         FLAC__StreamMetadata *to;
 527
 528         FLAC__ASSERT(0 != object);
 529
 530         if(0 != (to = FLAC__metadata_object_new(object->type))) {
 531                 to->is_last = object->is_last;
 532                 to->type = object->type;
 533                 to->length = object->length;
 534                 switch(to->type) {
 535                         case FLAC__METADATA_TYPE_STREAMINFO:
 536                                 memcpy(&to->data.stream_info, &object->data.stream_info, sizeof(FLAC__StreamMetadata_StreamInfo));
 537                                 break;
 538                         case FLAC__METADATA_TYPE_PADDING:
 539                                 break;
 540                         case FLAC__METADATA_TYPE_APPLICATION:
 541                                 if(to->length < FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8) { /* underflow check */
 542                                         FLAC__metadata_object_delete(to);
 543                                         return 0;
 544                                 }
 545                                 memcpy(&to->data.application.id, &object->data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8);
 546                                 if(!copy_bytes_(&to->data.application.data, object->data.application.data, object->length - FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8)) {
 547                                         FLAC__metadata_object_delete(to);
 548                                         return 0;
 549                                 }
 550                                 break;
 551                         case FLAC__METADATA_TYPE_SEEKTABLE:
 552                                 to->data.seek_table.num_points = object->data.seek_table.num_points;
 553                                 if(to->data.seek_table.num_points > SIZE_MAX / sizeof(FLAC__StreamMetadata_SeekPoint)) { /* overflow check */
 554                                         FLAC__metadata_object_delete(to);
 555                                         return 0;
 556                                 }
 557                                 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))) {
 558                                         FLAC__metadata_object_delete(to);
 559                                         return 0;
 560                                 }
 561                                 break;
 562                         case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 563                                 if(0 != to->data.vorbis_comment.vendor_string.entry) {
 564                                         free(to->data.vorbis_comment.vendor_string.entry);
 565                                         to->data.vorbis_comment.vendor_string.entry = 0;
 566                                 }
 567                                 if(!copy_vcentry_(&to->data.vorbis_comment.vendor_string, &object->data.vorbis_comment.vendor_string)) {
 568                                         FLAC__metadata_object_delete(to);
 569                                         return 0;
 570                                 }
 571                                 if(object->data.vorbis_comment.num_comments == 0) {
 572                                         FLAC__ASSERT(0 == object->data.vorbis_comment.comments);
 573                                         to->data.vorbis_comment.comments = 0;
 574                                 }
 575                                 else {
 576                                         FLAC__ASSERT(0 != object->data.vorbis_comment.comments);
 577                                         to->data.vorbis_comment.comments = vorbiscomment_entry_array_copy_(object->data.vorbis_comment.comments, object->data.vorbis_comment.num_comments);
 578                                         if(0 == to->data.vorbis_comment.comments) {
 579                                                 FLAC__metadata_object_delete(to);
 580                                                 return 0;
 581                                         }
 582                                 }
 583                                 to->data.vorbis_comment.num_comments = object->data.vorbis_comment.num_comments;
 584                                 break;
 585                         case FLAC__METADATA_TYPE_CUESHEET:
 586                                 memcpy(&to->data.cue_sheet, &object->data.cue_sheet, sizeof(FLAC__StreamMetadata_CueSheet));
 587                                 if(object->data.cue_sheet.num_tracks == 0) {
 588                                         FLAC__ASSERT(0 == object->data.cue_sheet.tracks);
 589                                 }
 590                                 else {
 591                                         FLAC__ASSERT(0 != object->data.cue_sheet.tracks);
 592                                         to->data.cue_sheet.tracks = cuesheet_track_array_copy_(object->data.cue_sheet.tracks, object->data.cue_sheet.num_tracks);
 593                                         if(0 == to->data.cue_sheet.tracks) {
 594                                                 FLAC__metadata_object_delete(to);
 595                                                 return 0;
 596                                         }
 597                                 }
 598                                 break;
 599                         case FLAC__METADATA_TYPE_PICTURE:
 600                                 to->data.picture.type = object->data.picture.type;
 601                                 if(!copy_cstring_(&to->data.picture.mime_type, object->data.picture.mime_type)) {
 602                                         FLAC__metadata_object_delete(to);
 603                                         return 0;
 604                                 }
 605                                 if(!copy_cstring_((char**)(&to->data.picture.description), (const char*)object->data.picture.description)) {
 606                                         FLAC__metadata_object_delete(to);
 607                                         return 0;
 608                                 }
 609                                 to->data.picture.width = object->data.picture.width;
 610                                 to->data.picture.height = object->data.picture.height;
 611                                 to->data.picture.depth = object->data.picture.depth;
 612                                 to->data.picture.colors = object->data.picture.colors;
 613                                 to->data.picture.data_length = object->data.picture.data_length;
 614                                 if(!copy_bytes_((&to->data.picture.data), object->data.picture.data, object->data.picture.data_length)) {
 615                                         FLAC__metadata_object_delete(to);
 616                                         return 0;
 617                                 }
 618                                 break;
 619                         default:
 620                                 if(!copy_bytes_(&to->data.unknown.data, object->data.unknown.data, object->length)) {
 621                                         FLAC__metadata_object_delete(to);
 622                                         return 0;
 623                                 }
 624                                 break;
 625                 }
 626         }
 627
 628         return to;
 629 }
 630
 631 void FLAC__metadata_object_delete_data(FLAC__StreamMetadata *object)
 632 {
 633         FLAC__ASSERT(0 != object);
 634
 635         switch(object->type) {
 636                 case FLAC__METADATA_TYPE_STREAMINFO:
 637                 case FLAC__METADATA_TYPE_PADDING:
 638                         break;
 639                 case FLAC__METADATA_TYPE_APPLICATION:
 640                         if(0 != object->data.application.data) {
 641                                 free(object->data.application.data);
 642                                 object->data.application.data = 0;
 643                         }
 644                         break;
 645                 case FLAC__METADATA_TYPE_SEEKTABLE:
 646                         if(0 != object->data.seek_table.points) {
 647                                 free(object->data.seek_table.points);
 648                                 object->data.seek_table.points = 0;
 649                         }
 650                         break;
 651                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 652                         if(0 != object->data.vorbis_comment.vendor_string.entry) {
 653                                 free(object->data.vorbis_comment.vendor_string.entry);
 654                                 object->data.vorbis_comment.vendor_string.entry = 0;
 655                         }
 656                         if(0 != object->data.vorbis_comment.comments) {
 657                                 FLAC__ASSERT(object->data.vorbis_comment.num_comments > 0);
 658                                 vorbiscomment_entry_array_delete_(object->data.vorbis_comment.comments, object->data.vorbis_comment.num_comments);
 659                         }
 660                         break;
 661                 case FLAC__METADATA_TYPE_CUESHEET:
 662                         if(0 != object->data.cue_sheet.tracks) {
 663                                 FLAC__ASSERT(object->data.cue_sheet.num_tracks > 0);
 664                                 cuesheet_track_array_delete_(object->data.cue_sheet.tracks, object->data.cue_sheet.num_tracks);
 665                         }
 666                         break;
 667                 case FLAC__METADATA_TYPE_PICTURE:
 668                         if(0 != object->data.picture.mime_type) {
 669                                 free(object->data.picture.mime_type);
 670                                 object->data.picture.mime_type = 0;
 671                         }
 672                         if(0 != object->data.picture.description) {
 673                                 free(object->data.picture.description);
 674                                 object->data.picture.description = 0;
 675                         }
 676                         if(0 != object->data.picture.data) {
 677                                 free(object->data.picture.data);
 678                                 object->data.picture.data = 0;
 679                         }
 680                         break;
 681                 default:
 682                         if(0 != object->data.unknown.data) {
 683                                 free(object->data.unknown.data);
 684                                 object->data.unknown.data = 0;
 685                         }
 686                         break;
 687         }
 688 }
 689
 690 FLAC_API void FLAC__metadata_object_delete(FLAC__StreamMetadata *object)
 691 {
 692         FLAC__metadata_object_delete_data(object);
 693         free(object);
 694 }
 695
 696 static FLAC__bool compare_block_data_streaminfo_(const FLAC__StreamMetadata_StreamInfo *block1, const FLAC__StreamMetadata_StreamInfo *block2)
 697 {
 698         if(block1->min_blocksize != block2->min_blocksize)
 699                 return false;
 700         if(block1->max_blocksize != block2->max_blocksize)
 701                 return false;
 702         if(block1->min_framesize != block2->min_framesize)
 703                 return false;
 704         if(block1->max_framesize != block2->max_framesize)
 705                 return false;
 706         if(block1->sample_rate != block2->sample_rate)
 707                 return false;
 708         if(block1->channels != block2->channels)
 709                 return false;
 710         if(block1->bits_per_sample != block2->bits_per_sample)
 711                 return false;
 712         if(block1->total_samples != block2->total_samples)
 713                 return false;
 714         if(0 != memcmp(block1->md5sum, block2->md5sum, 16))
 715                 return false;
 716         return true;
 717 }
 718
 719 static FLAC__bool compare_block_data_application_(const FLAC__StreamMetadata_Application *block1, const FLAC__StreamMetadata_Application *block2, unsigned block_length)
 720 {
 721         FLAC__ASSERT(0 != block1);
 722         FLAC__ASSERT(0 != block2);
 723         FLAC__ASSERT(block_length >= sizeof(block1->id));
 724
 725         if(0 != memcmp(block1->id, block2->id, sizeof(block1->id)))
 726                 return false;
 727         if(0 != block1->data && 0 != block2->data)
 728                 return 0 == memcmp(block1->data, block2->data, block_length - sizeof(block1->id));
 729         else
 730                 return block1->data == block2->data;
 731 }
 732
 733 static FLAC__bool compare_block_data_seektable_(const FLAC__StreamMetadata_SeekTable *block1, const FLAC__StreamMetadata_SeekTable *block2)
 734 {
 735         unsigned i;
 736
 737         FLAC__ASSERT(0 != block1);
 738         FLAC__ASSERT(0 != block2);
 739
 740         if(block1->num_points != block2->num_points)
 741                 return false;
 742
 743         if(0 != block1->points && 0 != block2->points) {
 744                 for(i = 0; i < block1->num_points; i++) {
 745                         if(block1->points[i].sample_number != block2->points[i].sample_number)
 746                                 return false;
 747                         if(block1->points[i].stream_offset != block2->points[i].stream_offset)
 748                                 return false;
 749                         if(block1->points[i].frame_samples != block2->points[i].frame_samples)
 750                                 return false;
 751                 }
 752                 return true;
 753         }
 754         else
 755                 return block1->points == block2->points;
 756 }
 757
 758 static FLAC__bool compare_block_data_vorbiscomment_(const FLAC__StreamMetadata_VorbisComment *block1, const FLAC__StreamMetadata_VorbisComment *block2)
 759 {
 760         unsigned i;
 761
 762         if(block1->vendor_string.length != block2->vendor_string.length)
 763                 return false;
 764
 765         if(0 != block1->vendor_string.entry && 0 != block2->vendor_string.entry) {
 766                 if(0 != memcmp(block1->vendor_string.entry, block2->vendor_string.entry, block1->vendor_string.length))
 767                         return false;
 768         }
 769         else if(block1->vendor_string.entry != block2->vendor_string.entry)
 770                 return false;
 771
 772         if(block1->num_comments != block2->num_comments)
 773                 return false;
 774
 775         for(i = 0; i < block1->num_comments; i++) {
 776                 if(0 != block1->comments[i].entry && 0 != block2->comments[i].entry) {
 777                         if(0 != memcmp(block1->comments[i].entry, block2->comments[i].entry, block1->comments[i].length))
 778                                 return false;
 779                 }
 780                 else if(block1->comments[i].entry != block2->comments[i].entry)
 781                         return false;
 782         }
 783         return true;
 784 }
 785
 786 static FLAC__bool compare_block_data_cuesheet_(const FLAC__StreamMetadata_CueSheet *block1, const FLAC__StreamMetadata_CueSheet *block2)
 787 {
 788         unsigned i, j;
 789
 790         if(0 != strcmp(block1->media_catalog_number, block2->media_catalog_number))
 791                 return false;
 792
 793         if(block1->lead_in != block2->lead_in)
 794                 return false;
 795
 796         if(block1->is_cd != block2->is_cd)
 797                 return false;
 798
 799         if(block1->num_tracks != block2->num_tracks)
 800                 return false;
 801
 802         if(0 != block1->tracks && 0 != block2->tracks) {
 803                 FLAC__ASSERT(block1->num_tracks > 0);
 804                 for(i = 0; i < block1->num_tracks; i++) {
 805                         if(block1->tracks[i].offset != block2->tracks[i].offset)
 806                                 return false;
 807                         if(block1->tracks[i].number != block2->tracks[i].number)
 808                                 return false;
 809                         if(0 != memcmp(block1->tracks[i].isrc, block2->tracks[i].isrc, sizeof(block1->tracks[i].isrc)))
 810                                 return false;
 811                         if(block1->tracks[i].type != block2->tracks[i].type)
 812                                 return false;
 813                         if(block1->tracks[i].pre_emphasis != block2->tracks[i].pre_emphasis)
 814                                 return false;
 815                         if(block1->tracks[i].num_indices != block2->tracks[i].num_indices)
 816                                 return false;
 817                         if(0 != block1->tracks[i].indices && 0 != block2->tracks[i].indices) {
 818                                 FLAC__ASSERT(block1->tracks[i].num_indices > 0);
 819                                 for(j = 0; j < block1->tracks[i].num_indices; j++) {
 820                                         if(block1->tracks[i].indices[j].offset != block2->tracks[i].indices[j].offset)
 821                                                 return false;
 822                                         if(block1->tracks[i].indices[j].number != block2->tracks[i].indices[j].number)
 823                                                 return false;
 824                                 }
 825                         }
 826                         else if(block1->tracks[i].indices != block2->tracks[i].indices)
 827                                 return false;
 828                 }
 829         }
 830         else if(block1->tracks != block2->tracks)
 831                 return false;
 832         return true;
 833 }
 834
 835 static FLAC__bool compare_block_data_picture_(const FLAC__StreamMetadata_Picture *block1, const FLAC__StreamMetadata_Picture *block2)
 836 {
 837         if(block1->type != block2->type)
 838                 return false;
 839         if(block1->mime_type != block2->mime_type && (0 == block1->mime_type || 0 == block2->mime_type || strcmp(block1->mime_type, block2->mime_type)))
 840                 return false;
 841         if(block1->description != block2->description && (0 == block1->description || 0 == block2->description || strcmp((const char *)block1->description, (const char *)block2->description)))
 842                 return false;
 843         if(block1->width != block2->width)
 844                 return false;
 845         if(block1->height != block2->height)
 846                 return false;
 847         if(block1->depth != block2->depth)
 848                 return false;
 849         if(block1->colors != block2->colors)
 850                 return false;
 851         if(block1->data_length != block2->data_length)
 852                 return false;
 853         if(block1->data != block2->data && (0 == block1->data || 0 == block2->data || memcmp(block1->data, block2->data, block1->data_length)))
 854                 return false;
 855         return true;
 856 }
 857
 858 static FLAC__bool compare_block_data_unknown_(const FLAC__StreamMetadata_Unknown *block1, const FLAC__StreamMetadata_Unknown *block2, unsigned block_length)
 859 {
 860         FLAC__ASSERT(0 != block1);
 861         FLAC__ASSERT(0 != block2);
 862
 863         if(0 != block1->data && 0 != block2->data)
 864                 return 0 == memcmp(block1->data, block2->data, block_length);
 865         else
 866                 return block1->data == block2->data;
 867 }
 868
 869 FLAC_API FLAC__bool FLAC__metadata_object_is_equal(const FLAC__StreamMetadata *block1, const FLAC__StreamMetadata *block2)
 870 {
 871         FLAC__ASSERT(0 != block1);
 872         FLAC__ASSERT(0 != block2);
 873
 874         if(block1->type != block2->type) {
 875                 return false;
 876         }
 877         if(block1->is_last != block2->is_last) {
 878                 return false;
 879         }
 880         if(block1->length != block2->length) {
 881                 return false;
 882         }
 883         switch(block1->type) {
 884                 case FLAC__METADATA_TYPE_STREAMINFO:
 885                         return compare_block_data_streaminfo_(&block1->data.stream_info, &block2->data.stream_info);
 886                 case FLAC__METADATA_TYPE_PADDING:
 887                         return true; /* we don't compare the padding guts */
 888                 case FLAC__METADATA_TYPE_APPLICATION:
 889                         return compare_block_data_application_(&block1->data.application, &block2->data.application, block1->length);
 890                 case FLAC__METADATA_TYPE_SEEKTABLE:
 891                         return compare_block_data_seektable_(&block1->data.seek_table, &block2->data.seek_table);
 892                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 893                         return compare_block_data_vorbiscomment_(&block1->data.vorbis_comment, &block2->data.vorbis_comment);
 894                 case FLAC__METADATA_TYPE_CUESHEET:
 895                         return compare_block_data_cuesheet_(&block1->data.cue_sheet, &block2->data.cue_sheet);
 896                 case FLAC__METADATA_TYPE_PICTURE:
 897                         return compare_block_data_picture_(&block1->data.picture, &block2->data.picture);
 898                 default:
 899                         return compare_block_data_unknown_(&block1->data.unknown, &block2->data.unknown, block1->length);
 900         }
 901 }
 902
 903 FLAC_API FLAC__bool FLAC__metadata_object_application_set_data(FLAC__StreamMetadata *object, FLAC__byte *data, unsigned length, FLAC__bool copy)
 904 {
 905         FLAC__byte *save;
 906
 907         FLAC__ASSERT(0 != object);
 908         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_APPLICATION);
 909         FLAC__ASSERT((0 != data && length > 0) || (0 == data && length == 0 && copy == false));
 910
 911         save = object->data.application.data;
 912
 913         /* do the copy first so that if we fail we leave the object untouched */
 914         if(copy) {
 915                 if(!copy_bytes_(&object->data.application.data, data, length))
 916                         return false;
 917         }
 918         else {
 919                 object->data.application.data = data;
 920         }
 921
 922         if(0 != save)
 923                 free(save);
 924
 925         object->length = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8 + length;
 926         return true;
 927 }
 928
 929 FLAC_API FLAC__bool FLAC__metadata_object_seektable_resize_points(FLAC__StreamMetadata *object, unsigned new_num_points)
 930 {
 931         FLAC__ASSERT(0 != object);
 932         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 933
 934         if(0 == object->data.seek_table.points) {
 935                 FLAC__ASSERT(object->data.seek_table.num_points == 0);
 936                 if(0 == new_num_points)
 937                         return true;
 938                 else if(0 == (object->data.seek_table.points = seekpoint_array_new_(new_num_points)))
 939                         return false;
 940         }
 941         else {
 942                 const size_t old_size = object->data.seek_table.num_points * sizeof(FLAC__StreamMetadata_SeekPoint);
 943                 const size_t new_size = new_num_points * sizeof(FLAC__StreamMetadata_SeekPoint);
 944
 945                 /* overflow check */
 946                 if((size_t)new_num_points > SIZE_MAX / sizeof(FLAC__StreamMetadata_SeekPoint))
 947                         return false;
 948
 949                 FLAC__ASSERT(object->data.seek_table.num_points > 0);
 950
 951                 if(new_size == 0) {
 952                         free(object->data.seek_table.points);
 953                         object->data.seek_table.points = 0;
 954                 }
 955                 else if(0 == (object->data.seek_table.points = (FLAC__StreamMetadata_SeekPoint*)realloc(object->data.seek_table.points, new_size)))
 956                         return false;
 957
 958                 /* if growing, set new elements to placeholders */
 959                 if(new_size > old_size) {
 960                         unsigned i;
 961                         for(i = object->data.seek_table.num_points; i < new_num_points; i++) {
 962                                 object->data.seek_table.points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
 963                                 object->data.seek_table.points[i].stream_offset = 0;
 964                                 object->data.seek_table.points[i].frame_samples = 0;
 965                         }
 966                 }
 967         }
 968
 969         object->data.seek_table.num_points = new_num_points;
 970
 971         seektable_calculate_length_(object);
 972         return true;
 973 }
 974
 975 FLAC_API void FLAC__metadata_object_seektable_set_point(FLAC__StreamMetadata *object, unsigned point_num, FLAC__StreamMetadata_SeekPoint point)
 976 {
 977         FLAC__ASSERT(0 != object);
 978         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 979         FLAC__ASSERT(point_num < object->data.seek_table.num_points);
 980
 981         object->data.seek_table.points[point_num] = point;
 982 }
 983
 984 FLAC_API FLAC__bool FLAC__metadata_object_seektable_insert_point(FLAC__StreamMetadata *object, unsigned point_num, FLAC__StreamMetadata_SeekPoint point)
 985 {
 986         int i;
 987
 988         FLAC__ASSERT(0 != object);
 989         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
 990         FLAC__ASSERT(point_num <= object->data.seek_table.num_points);
 991
 992         if(!FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points+1))
 993                 return false;
 994
 995         /* move all points >= point_num forward one space */
 996         for(i = (int)object->data.seek_table.num_points-1; i > (int)point_num; i--)
 997                 object->data.seek_table.points[i] = object->data.seek_table.points[i-1];
 998
 999         FLAC__metadata_object_seektable_set_point(object, point_num, point);
1000         seektable_calculate_length_(object);
1001         return true;
1002 }
1003
1004 FLAC_API FLAC__bool FLAC__metadata_object_seektable_delete_point(FLAC__StreamMetadata *object, unsigned point_num)
1005 {
1006         unsigned i;
1007
1008         FLAC__ASSERT(0 != object);
1009         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1010         FLAC__ASSERT(point_num < object->data.seek_table.num_points);
1011
1012         /* move all points > point_num backward one space */
1013         for(i = point_num; i < object->data.seek_table.num_points-1; i++)
1014                 object->data.seek_table.points[i] = object->data.seek_table.points[i+1];
1015
1016         return FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points-1);
1017 }
1018
1019 FLAC_API FLAC__bool FLAC__metadata_object_seektable_is_legal(const FLAC__StreamMetadata *object)
1020 {
1021         FLAC__ASSERT(0 != object);
1022         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1023
1024         return FLAC__format_seektable_is_legal(&object->data.seek_table);
1025 }
1026
1027 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_placeholders(FLAC__StreamMetadata *object, unsigned num)
1028 {
1029         FLAC__ASSERT(0 != object);
1030         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1031
1032         if(num > 0)
1033                 /* WATCHOUT: we rely on the fact that growing the array adds PLACEHOLDERS at the end */
1034                 return FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points + num);
1035         else
1036                 return true;
1037 }
1038
1039 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_point(FLAC__StreamMetadata *object, FLAC__uint64 sample_number)
1040 {
1041         FLAC__StreamMetadata_SeekTable *seek_table;
1042
1043         FLAC__ASSERT(0 != object);
1044         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1045
1046         seek_table = &object->data.seek_table;
1047
1048         if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + 1))
1049                 return false;
1050
1051         seek_table->points[seek_table->num_points - 1].sample_number = sample_number;
1052         seek_table->points[seek_table->num_points - 1].stream_offset = 0;
1053         seek_table->points[seek_table->num_points - 1].frame_samples = 0;
1054
1055         return true;
1056 }
1057
1058 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_points(FLAC__StreamMetadata *object, FLAC__uint64 sample_numbers[], unsigned num)
1059 {
1060         FLAC__ASSERT(0 != object);
1061         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1062         FLAC__ASSERT(0 != sample_numbers || num == 0);
1063
1064         if(num > 0) {
1065                 FLAC__StreamMetadata_SeekTable *seek_table = &object->data.seek_table;
1066                 unsigned i, j;
1067
1068                 i = seek_table->num_points;
1069
1070                 if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + num))
1071                         return false;
1072
1073                 for(j = 0; j < num; i++, j++) {
1074                         seek_table->points[i].sample_number = sample_numbers[j];
1075                         seek_table->points[i].stream_offset = 0;
1076                         seek_table->points[i].frame_samples = 0;
1077                 }
1078         }
1079
1080         return true;
1081 }
1082
1083 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_spaced_points(FLAC__StreamMetadata *object, unsigned num, FLAC__uint64 total_samples)
1084 {
1085         FLAC__ASSERT(0 != object);
1086         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1087         FLAC__ASSERT(total_samples > 0);
1088
1089         if(num > 0 && total_samples > 0) {
1090                 FLAC__StreamMetadata_SeekTable *seek_table = &object->data.seek_table;
1091                 unsigned i, j;
1092
1093                 i = seek_table->num_points;
1094
1095                 if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + num))
1096                         return false;
1097
1098                 for(j = 0; j < num; i++, j++) {
1099                         seek_table->points[i].sample_number = total_samples * (FLAC__uint64)j / (FLAC__uint64)num;
1100                         seek_table->points[i].stream_offset = 0;
1101                         seek_table->points[i].frame_samples = 0;
1102                 }
1103         }
1104
1105         return true;
1106 }
1107
1108 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(FLAC__StreamMetadata *object, unsigned samples, FLAC__uint64 total_samples)
1109 {
1110         FLAC__ASSERT(0 != object);
1111         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1112         FLAC__ASSERT(samples > 0);
1113         FLAC__ASSERT(total_samples > 0);
1114
1115         if(samples > 0 && total_samples > 0) {
1116                 FLAC__StreamMetadata_SeekTable *seek_table = &object->data.seek_table;
1117                 unsigned i, j;
1118                 FLAC__uint64 num, sample;
1119
1120                 num = 1 + total_samples / samples; /* 1+ for the first sample at 0 */
1121                 /* now account for the fact that we don't place a seekpoint at "total_samples" since samples are number from 0: */
1122                 if(total_samples % samples == 0)
1123                         num--;
1124
1125                 i = seek_table->num_points;
1126
1127                 if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + (unsigned)num))
1128                         return false;
1129
1130                 sample = 0;
1131                 for(j = 0; j < num; i++, j++, sample += samples) {
1132                         seek_table->points[i].sample_number = sample;
1133                         seek_table->points[i].stream_offset = 0;
1134                         seek_table->points[i].frame_samples = 0;
1135                 }
1136         }
1137
1138         return true;
1139 }
1140
1141 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_sort(FLAC__StreamMetadata *object, FLAC__bool compact)
1142 {
1143         unsigned unique;
1144
1145         FLAC__ASSERT(0 != object);
1146         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
1147
1148         unique = FLAC__format_seektable_sort(&object->data.seek_table);
1149
1150         return !compact || FLAC__metadata_object_seektable_resize_points(object, unique);
1151 }
1152
1153 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_vendor_string(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
1154 {
1155         if(!FLAC__format_vorbiscomment_entry_value_is_legal(entry.entry, entry.length))
1156                 return false;
1157         return vorbiscomment_set_entry_(object, &object->data.vorbis_comment.vendor_string, &entry, copy);
1158 }
1159
1160 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_resize_comments(FLAC__StreamMetadata *object, unsigned new_num_comments)
1161 {
1162         FLAC__ASSERT(0 != object);
1163         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1164
1165         if(0 == object->data.vorbis_comment.comments) {
1166                 FLAC__ASSERT(object->data.vorbis_comment.num_comments == 0);
1167                 if(0 == new_num_comments)
1168                         return true;
1169                 else if(0 == (object->data.vorbis_comment.comments = vorbiscomment_entry_array_new_(new_num_comments)))
1170                         return false;
1171         }
1172         else {
1173                 const size_t old_size = object->data.vorbis_comment.num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry);
1174                 const size_t new_size = new_num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry);
1175
1176                 /* overflow check */
1177                 if((size_t)new_num_comments > SIZE_MAX / sizeof(FLAC__StreamMetadata_VorbisComment_Entry))
1178                         return false;
1179
1180                 FLAC__ASSERT(object->data.vorbis_comment.num_comments > 0);
1181
1182                 /* if shrinking, free the truncated entries */
1183                 if(new_num_comments < object->data.vorbis_comment.num_comments) {
1184                         unsigned i;
1185                         for(i = new_num_comments; i < object->data.vorbis_comment.num_comments; i++)
1186                                 if(0 != object->data.vorbis_comment.comments[i].entry)
1187                                         free(object->data.vorbis_comment.comments[i].entry);
1188                 }
1189
1190                 if(new_size == 0) {
1191                         free(object->data.vorbis_comment.comments);
1192                         object->data.vorbis_comment.comments = 0;
1193                 }
1194                 else if(0 == (object->data.vorbis_comment.comments = (FLAC__StreamMetadata_VorbisComment_Entry*)realloc(object->data.vorbis_comment.comments, new_size)))
1195                         return false;
1196
1197                 /* if growing, zero all the length/pointers of new elements */
1198                 if(new_size > old_size)
1199                         memset(object->data.vorbis_comment.comments + object->data.vorbis_comment.num_comments, 0, new_size - old_size);
1200         }
1201
1202         object->data.vorbis_comment.num_comments = new_num_comments;
1203
1204         vorbiscomment_calculate_length_(object);
1205         return true;
1206 }
1207
1208 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_comment(FLAC__StreamMetadata *object, unsigned comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
1209 {
1210         FLAC__ASSERT(0 != object);
1211         FLAC__ASSERT(comment_num < object->data.vorbis_comment.num_comments);
1212
1213         if(!FLAC__format_vorbiscomment_entry_is_legal(entry.entry, entry.length))
1214                 return false;
1215         return vorbiscomment_set_entry_(object, &object->data.vorbis_comment.comments[comment_num], &entry, copy);
1216 }
1217
1218 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_insert_comment(FLAC__StreamMetadata *object, unsigned comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
1219 {
1220         FLAC__StreamMetadata_VorbisComment *vc;
1221
1222         FLAC__ASSERT(0 != object);
1223         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1224         FLAC__ASSERT(comment_num <= object->data.vorbis_comment.num_comments);
1225
1226         if(!FLAC__format_vorbiscomment_entry_is_legal(entry.entry, entry.length))
1227                 return false;
1228
1229         vc = &object->data.vorbis_comment;
1230
1231         if(!FLAC__metadata_object_vorbiscomment_resize_comments(object, vc->num_comments+1))
1232                 return false;
1233
1234         /* move all comments >= comment_num forward one space */
1235         memmove(&vc->comments[comment_num+1], &vc->comments[comment_num], sizeof(FLAC__StreamMetadata_VorbisComment_Entry)*(vc->num_comments-1-comment_num));
1236         vc->comments[comment_num].length = 0;
1237         vc->comments[comment_num].entry = 0;
1238
1239         return FLAC__metadata_object_vorbiscomment_set_comment(object, comment_num, entry, copy);
1240 }
1241
1242 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_append_comment(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
1243 {
1244         FLAC__ASSERT(0 != object);
1245         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1246         return FLAC__metadata_object_vorbiscomment_insert_comment(object, object->data.vorbis_comment.num_comments, entry, copy);
1247 }
1248
1249 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_replace_comment(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool all, FLAC__bool copy)
1250 {
1251         FLAC__ASSERT(0 != entry.entry && entry.length > 0);
1252
1253         if(!FLAC__format_vorbiscomment_entry_is_legal(entry.entry, entry.length))
1254                 return false;
1255
1256         {
1257                 int i;
1258                 size_t field_name_length;
1259                 const FLAC__byte *eq = (FLAC__byte*)memchr(entry.entry, '=', entry.length);
1260
1261                 FLAC__ASSERT(0 != eq);
1262
1263                 if(0 == eq)
1264                         return false; /* double protection */
1265
1266                 field_name_length = eq-entry.entry;
1267
1268                 i = vorbiscomment_find_entry_from_(object, 0, (const char *)entry.entry, field_name_length);
1269                 if(i >= 0) {
1270                         unsigned index = (unsigned)i;
1271                         if(!FLAC__metadata_object_vorbiscomment_set_comment(object, index, entry, copy))
1272                                 return false;
1273                         entry = object->data.vorbis_comment.comments[index];
1274                         index++; /* skip over replaced comment */
1275                         if(all && index < object->data.vorbis_comment.num_comments) {
1276                                 i = vorbiscomment_find_entry_from_(object, index, (const char *)entry.entry, field_name_length);
1277                                 while(i >= 0) {
1278                                         index = (unsigned)i;
1279                                         if(!FLAC__metadata_object_vorbiscomment_delete_comment(object, index))
1280                                                 return false;
1281                                         if(index < object->data.vorbis_comment.num_comments)
1282                                                 i = vorbiscomment_find_entry_from_(object, index, (const char *)entry.entry, field_name_length);
1283                                         else
1284                                                 i = -1;
1285                                 }
1286                         }
1287                         return true;
1288                 }
1289                 else
1290                         return FLAC__metadata_object_vorbiscomment_append_comment(object, entry, copy);
1291         }
1292 }
1293
1294 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_delete_comment(FLAC__StreamMetadata *object, unsigned comment_num)
1295 {
1296         FLAC__StreamMetadata_VorbisComment *vc;
1297
1298         FLAC__ASSERT(0 != object);
1299         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1300         FLAC__ASSERT(comment_num < object->data.vorbis_comment.num_comments);
1301
1302         vc = &object->data.vorbis_comment;
1303
1304         /* free the comment at comment_num */
1305         if(0 != vc->comments[comment_num].entry)
1306                 free(vc->comments[comment_num].entry);
1307
1308         /* move all comments > comment_num backward one space */
1309         memmove(&vc->comments[comment_num], &vc->comments[comment_num+1], sizeof(FLAC__StreamMetadata_VorbisComment_Entry)*(vc->num_comments-comment_num-1));
1310         vc->comments[vc->num_comments-1].length = 0;
1311         vc->comments[vc->num_comments-1].entry = 0;
1312
1313         return FLAC__metadata_object_vorbiscomment_resize_comments(object, vc->num_comments-1);
1314 }
1315
1316 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)
1317 {
1318         FLAC__ASSERT(0 != entry);
1319         FLAC__ASSERT(0 != field_name);
1320         FLAC__ASSERT(0 != field_value);
1321
1322         if(!FLAC__format_vorbiscomment_entry_name_is_legal(field_name))
1323                 return false;
1324         if(!FLAC__format_vorbiscomment_entry_value_is_legal((const FLAC__byte *)field_value, (unsigned)(-1)))
1325                 return false;
1326
1327         {
1328                 const size_t nn = strlen(field_name);
1329                 const size_t nv = strlen(field_value);
1330                 entry->length = nn + 1 /*=*/ + nv;
1331                 if(0 == (entry->entry = (FLAC__byte*)safe_malloc_add_4op_(nn, /*+*/1, /*+*/nv, /*+*/1)))
1332                         return false;
1333                 memcpy(entry->entry, field_name, nn);
1334                 entry->entry[nn] = '=';
1335                 memcpy(entry->entry+nn+1, field_value, nv);
1336                 entry->entry[entry->length] = '\0';
1337         }
1338
1339         return true;
1340 }
1341
1342 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)
1343 {
1344         FLAC__ASSERT(0 != entry.entry && entry.length > 0);
1345         FLAC__ASSERT(0 != field_name);
1346         FLAC__ASSERT(0 != field_value);
1347
1348         if(!FLAC__format_vorbiscomment_entry_is_legal(entry.entry, entry.length))
1349                 return false;
1350
1351         {
1352                 const FLAC__byte *eq = (FLAC__byte*)memchr(entry.entry, '=', entry.length);
1353                 const size_t nn = eq-entry.entry;
1354                 const size_t nv = entry.length-nn-1; /* -1 for the '=' */
1355                 FLAC__ASSERT(0 != eq);
1356                 if(0 == eq)
1357                         return false; /* double protection */
1358                 if(0 == (*field_name = (char*)safe_malloc_add_2op_(nn, /*+*/1)))
1359                         return false;
1360                 if(0 == (*field_value = (char*)safe_malloc_add_2op_(nv, /*+*/1))) {
1361                         free(*field_name);
1362                         return false;
1363                 }
1364                 memcpy(*field_name, entry.entry, nn);
1365                 memcpy(*field_value, entry.entry+nn+1, nv);
1366                 (*field_name)[nn] = '\0';
1367                 (*field_value)[nv] = '\0';
1368         }
1369
1370         return true;
1371 }
1372
1373 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_matches(const FLAC__StreamMetadata_VorbisComment_Entry entry, const char *field_name, unsigned field_name_length)
1374 {
1375         FLAC__ASSERT(0 != entry.entry && entry.length > 0);
1376         {
1377                 const FLAC__byte *eq = (FLAC__byte*)memchr(entry.entry, '=', entry.length);
1378 #if defined _MSC_VER || defined __BORLANDC__ || defined __MINGW32__ || defined __EMX__
1379 #define FLAC__STRNCASECMP strnicmp
1380 #else
1381 #define FLAC__STRNCASECMP strncasecmp
1382 #endif
1383                 return (0 != eq && (unsigned)(eq-entry.entry) == field_name_length && 0 == FLAC__STRNCASECMP(field_name, (const char *)entry.entry, field_name_length));
1384 #undef FLAC__STRNCASECMP
1385         }
1386 }
1387
1388 FLAC_API int FLAC__metadata_object_vorbiscomment_find_entry_from(const FLAC__StreamMetadata *object, unsigned offset, const char *field_name)
1389 {
1390         FLAC__ASSERT(0 != field_name);
1391
1392         return vorbiscomment_find_entry_from_(object, offset, field_name, strlen(field_name));
1393 }
1394
1395 FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entry_matching(FLAC__StreamMetadata *object, const char *field_name)
1396 {
1397         const unsigned field_name_length = strlen(field_name);
1398         unsigned i;
1399
1400         FLAC__ASSERT(0 != object);
1401         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1402
1403         for(i = 0; i < object->data.vorbis_comment.num_comments; i++) {
1404                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments[i], field_name, field_name_length)) {
1405                         if(!FLAC__metadata_object_vorbiscomment_delete_comment(object, i))
1406                                 return -1;
1407                         else
1408                                 return 1;
1409                 }
1410         }
1411
1412         return 0;
1413 }
1414
1415 FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entries_matching(FLAC__StreamMetadata *object, const char *field_name)
1416 {
1417         FLAC__bool ok = true;
1418         unsigned matching = 0;
1419         const unsigned field_name_length = strlen(field_name);
1420         int i;
1421
1422         FLAC__ASSERT(0 != object);
1423         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
1424
1425         /* must delete from end to start otherwise it will interfere with our iteration */
1426         for(i = (int)object->data.vorbis_comment.num_comments - 1; ok && i >= 0; i--) {
1427                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments[i], field_name, field_name_length)) {
1428                         matching++;
1429                         ok &= FLAC__metadata_object_vorbiscomment_delete_comment(object, (unsigned)i);
1430                 }
1431         }
1432
1433         return ok? (int)matching : -1;
1434 }
1435
1436 FLAC_API FLAC__StreamMetadata_CueSheet_Track *FLAC__metadata_object_cuesheet_track_new(void)
1437 {
1438         return (FLAC__StreamMetadata_CueSheet_Track*)calloc(1, sizeof(FLAC__StreamMetadata_CueSheet_Track));
1439 }
1440
1441 FLAC_API FLAC__StreamMetadata_CueSheet_Track *FLAC__metadata_object_cuesheet_track_clone(const FLAC__StreamMetadata_CueSheet_Track *object)
1442 {
1443         FLAC__StreamMetadata_CueSheet_Track *to;
1444
1445         FLAC__ASSERT(0 != object);
1446
1447         if(0 != (to = FLAC__metadata_object_cuesheet_track_new())) {
1448                 if(!copy_track_(to, object)) {
1449                         FLAC__metadata_object_cuesheet_track_delete(to);
1450                         return 0;
1451                 }
1452         }
1453
1454         return to;
1455 }
1456
1457 void FLAC__metadata_object_cuesheet_track_delete_data(FLAC__StreamMetadata_CueSheet_Track *object)
1458 {
1459         FLAC__ASSERT(0 != object);
1460
1461         if(0 != object->indices) {
1462                 FLAC__ASSERT(object->num_indices > 0);
1463                 free(object->indices);
1464         }
1465 }
1466
1467 FLAC_API void FLAC__metadata_object_cuesheet_track_delete(FLAC__StreamMetadata_CueSheet_Track *object)
1468 {
1469         FLAC__metadata_object_cuesheet_track_delete_data(object);
1470         free(object);
1471 }
1472
1473 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_resize_indices(FLAC__StreamMetadata *object, unsigned track_num, unsigned new_num_indices)
1474 {
1475         FLAC__StreamMetadata_CueSheet_Track *track;
1476         FLAC__ASSERT(0 != object);
1477         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1478         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1479
1480         track = &object->data.cue_sheet.tracks[track_num];
1481
1482         if(0 == track->indices) {
1483                 FLAC__ASSERT(track->num_indices == 0);
1484                 if(0 == new_num_indices)
1485                         return true;
1486                 else if(0 == (track->indices = cuesheet_track_index_array_new_(new_num_indices)))
1487                         return false;
1488         }
1489         else {
1490                 const size_t old_size = track->num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index);
1491                 const size_t new_size = new_num_indices * sizeof(FLAC__StreamMetadata_CueSheet_Index);
1492
1493                 /* overflow check */
1494                 if((size_t)new_num_indices > SIZE_MAX / sizeof(FLAC__StreamMetadata_CueSheet_Index))
1495                         return false;
1496
1497                 FLAC__ASSERT(track->num_indices > 0);
1498
1499                 if(new_size == 0) {
1500                         free(track->indices);
1501                         track->indices = 0;
1502                 }
1503                 else if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)realloc(track->indices, new_size)))
1504                         return false;
1505
1506                 /* if growing, zero all the lengths/pointers of new elements */
1507                 if(new_size > old_size)
1508                         memset(track->indices + track->num_indices, 0, new_size - old_size);
1509         }
1510
1511         track->num_indices = new_num_indices;
1512
1513         cuesheet_calculate_length_(object);
1514         return true;
1515 }
1516
1517 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)
1518 {
1519         FLAC__StreamMetadata_CueSheet_Track *track;
1520
1521         FLAC__ASSERT(0 != object);
1522         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1523         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1524         FLAC__ASSERT(index_num <= object->data.cue_sheet.tracks[track_num].num_indices);
1525
1526         track = &object->data.cue_sheet.tracks[track_num];
1527
1528         if(!FLAC__metadata_object_cuesheet_track_resize_indices(object, track_num, track->num_indices+1))
1529                 return false;
1530
1531         /* move all indices >= index_num forward one space */
1532         memmove(&track->indices[index_num+1], &track->indices[index_num], sizeof(FLAC__StreamMetadata_CueSheet_Index)*(track->num_indices-1-index_num));
1533
1534         track->indices[index_num] = index;
1535         cuesheet_calculate_length_(object);
1536         return true;
1537 }
1538
1539 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_insert_blank_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num)
1540 {
1541         FLAC__StreamMetadata_CueSheet_Index index;
1542         memset(&index, 0, sizeof(index));
1543         return FLAC__metadata_object_cuesheet_track_insert_index(object, track_num, index_num, index);
1544 }
1545
1546 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_delete_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num)
1547 {
1548         FLAC__StreamMetadata_CueSheet_Track *track;
1549
1550         FLAC__ASSERT(0 != object);
1551         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1552         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1553         FLAC__ASSERT(index_num < object->data.cue_sheet.tracks[track_num].num_indices);
1554
1555         track = &object->data.cue_sheet.tracks[track_num];
1556
1557         /* move all indices > index_num backward one space */
1558         memmove(&track->indices[index_num], &track->indices[index_num+1], sizeof(FLAC__StreamMetadata_CueSheet_Index)*(track->num_indices-index_num-1));
1559
1560         FLAC__metadata_object_cuesheet_track_resize_indices(object, track_num, track->num_indices-1);
1561         cuesheet_calculate_length_(object);
1562         return true;
1563 }
1564
1565 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_resize_tracks(FLAC__StreamMetadata *object, unsigned new_num_tracks)
1566 {
1567         FLAC__ASSERT(0 != object);
1568         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1569
1570         if(0 == object->data.cue_sheet.tracks) {
1571                 FLAC__ASSERT(object->data.cue_sheet.num_tracks == 0);
1572                 if(0 == new_num_tracks)
1573                         return true;
1574                 else if(0 == (object->data.cue_sheet.tracks = cuesheet_track_array_new_(new_num_tracks)))
1575                         return false;
1576         }
1577         else {
1578                 const size_t old_size = object->data.cue_sheet.num_tracks * sizeof(FLAC__StreamMetadata_CueSheet_Track);
1579                 const size_t new_size = new_num_tracks * sizeof(FLAC__StreamMetadata_CueSheet_Track);
1580
1581                 /* overflow check */
1582                 if((size_t)new_num_tracks > SIZE_MAX / sizeof(FLAC__StreamMetadata_CueSheet_Track))
1583                         return false;
1584
1585                 FLAC__ASSERT(object->data.cue_sheet.num_tracks > 0);
1586
1587                 /* if shrinking, free the truncated entries */
1588                 if(new_num_tracks < object->data.cue_sheet.num_tracks) {
1589                         unsigned i;
1590                         for(i = new_num_tracks; i < object->data.cue_sheet.num_tracks; i++)
1591                                 if(0 != object->data.cue_sheet.tracks[i].indices)
1592                                         free(object->data.cue_sheet.tracks[i].indices);
1593                 }
1594
1595                 if(new_size == 0) {
1596                         free(object->data.cue_sheet.tracks);
1597                         object->data.cue_sheet.tracks = 0;
1598                 }
1599                 else if(0 == (object->data.cue_sheet.tracks = (FLAC__StreamMetadata_CueSheet_Track*)realloc(object->data.cue_sheet.tracks, new_size)))
1600                         return false;
1601
1602                 /* if growing, zero all the lengths/pointers of new elements */
1603                 if(new_size > old_size)
1604                         memset(object->data.cue_sheet.tracks + object->data.cue_sheet.num_tracks, 0, new_size - old_size);
1605         }
1606
1607         object->data.cue_sheet.num_tracks = new_num_tracks;
1608
1609         cuesheet_calculate_length_(object);
1610         return true;
1611 }
1612
1613 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_set_track(FLAC__StreamMetadata *object, unsigned track_num, FLAC__StreamMetadata_CueSheet_Track *track, FLAC__bool copy)
1614 {
1615         FLAC__ASSERT(0 != object);
1616         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1617
1618         return cuesheet_set_track_(object, object->data.cue_sheet.tracks + track_num, track, copy);
1619 }
1620
1621 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_insert_track(FLAC__StreamMetadata *object, unsigned track_num, FLAC__StreamMetadata_CueSheet_Track *track, FLAC__bool copy)
1622 {
1623         FLAC__StreamMetadata_CueSheet *cs;
1624
1625         FLAC__ASSERT(0 != object);
1626         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1627         FLAC__ASSERT(track_num <= object->data.cue_sheet.num_tracks);
1628
1629         cs = &object->data.cue_sheet;
1630
1631         if(!FLAC__metadata_object_cuesheet_resize_tracks(object, cs->num_tracks+1))
1632                 return false;
1633
1634         /* move all tracks >= track_num forward one space */
1635         memmove(&cs->tracks[track_num+1], &cs->tracks[track_num], sizeof(FLAC__StreamMetadata_CueSheet_Track)*(cs->num_tracks-1-track_num));
1636         cs->tracks[track_num].num_indices = 0;
1637         cs->tracks[track_num].indices = 0;
1638
1639         return FLAC__metadata_object_cuesheet_set_track(object, track_num, track, copy);
1640 }
1641
1642 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_insert_blank_track(FLAC__StreamMetadata *object, unsigned track_num)
1643 {
1644         FLAC__StreamMetadata_CueSheet_Track track;
1645         memset(&track, 0, sizeof(track));
1646         return FLAC__metadata_object_cuesheet_insert_track(object, track_num, &track, /*copy=*/false);
1647 }
1648
1649 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_delete_track(FLAC__StreamMetadata *object, unsigned track_num)
1650 {
1651         FLAC__StreamMetadata_CueSheet *cs;
1652
1653         FLAC__ASSERT(0 != object);
1654         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1655         FLAC__ASSERT(track_num < object->data.cue_sheet.num_tracks);
1656
1657         cs = &object->data.cue_sheet;
1658
1659         /* free the track at track_num */
1660         if(0 != cs->tracks[track_num].indices)
1661                 free(cs->tracks[track_num].indices);
1662
1663         /* move all tracks > track_num backward one space */
1664         memmove(&cs->tracks[track_num], &cs->tracks[track_num+1], sizeof(FLAC__StreamMetadata_CueSheet_Track)*(cs->num_tracks-track_num-1));
1665         cs->tracks[cs->num_tracks-1].num_indices = 0;
1666         cs->tracks[cs->num_tracks-1].indices = 0;
1667
1668         return FLAC__metadata_object_cuesheet_resize_tracks(object, cs->num_tracks-1);
1669 }
1670
1671 FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_is_legal(const FLAC__StreamMetadata *object, FLAC__bool check_cd_da_subset, const char **violation)
1672 {
1673         FLAC__ASSERT(0 != object);
1674         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1675
1676         return FLAC__format_cuesheet_is_legal(&object->data.cue_sheet, check_cd_da_subset, violation);
1677 }
1678
1679 static FLAC__uint64 get_index_01_offset_(const FLAC__StreamMetadata_CueSheet *cs, unsigned track)
1680 {
1681         if (track >= (cs->num_tracks-1) || cs->tracks[track].num_indices < 1)
1682                 return 0;
1683         else if (cs->tracks[track].indices[0].number == 1)
1684                 return cs->tracks[track].indices[0].offset + cs->tracks[track].offset + cs->lead_in;
1685         else if (cs->tracks[track].num_indices < 2)
1686                 return 0;
1687         else if (cs->tracks[track].indices[1].number == 1)
1688                 return cs->tracks[track].indices[1].offset + cs->tracks[track].offset + cs->lead_in;
1689         else
1690                 return 0;
1691 }
1692
1693 static FLAC__uint32 cddb_add_digits_(FLAC__uint32 x)
1694 {
1695         FLAC__uint32 n = 0;
1696         while (x) {
1697                 n += (x%10);
1698                 x /= 10;
1699         }
1700         return n;
1701 }
1702
1703 /*@@@@add to tests*/
1704 FLAC_API FLAC__uint32 FLAC__metadata_object_cuesheet_calculate_cddb_id(const FLAC__StreamMetadata *object)
1705 {
1706         const FLAC__StreamMetadata_CueSheet *cs;
1707
1708         FLAC__ASSERT(0 != object);
1709         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
1710
1711         cs = &object->data.cue_sheet;
1712
1713         if (cs->num_tracks < 2) /* need at least one real track and the lead-out track */
1714                 return 0;
1715
1716         {
1717                 FLAC__uint32 i, length, sum = 0;
1718                 for (i = 0; i < (cs->num_tracks-1); i++) /* -1 to avoid counting the lead-out */
1719                         sum += cddb_add_digits_((FLAC__uint32)(get_index_01_offset_(cs, i) / 44100));
1720                 length = (FLAC__uint32)((cs->tracks[cs->num_tracks-1].offset+cs->lead_in) / 44100) - (FLAC__uint32)(get_index_01_offset_(cs, 0) / 44100);
1721
1722                 return (sum % 0xFF) << 24 | length << 8 | (FLAC__uint32)(cs->num_tracks-1);
1723         }
1724 }
1725
1726 FLAC_API FLAC__bool FLAC__metadata_object_picture_set_mime_type(FLAC__StreamMetadata *object, char *mime_type, FLAC__bool copy)
1727 {
1728         char *old;
1729         size_t old_length, new_length;
1730
1731         FLAC__ASSERT(0 != object);
1732         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_PICTURE);
1733         FLAC__ASSERT(0 != mime_type);
1734
1735         old = object->data.picture.mime_type;
1736         old_length = old? strlen(old) : 0;
1737         new_length = strlen(mime_type);
1738
1739         /* do the copy first so that if we fail we leave the object untouched */
1740         if(copy) {
1741                 if(new_length >= SIZE_MAX) /* overflow check */
1742                         return false;
1743                 if(!copy_bytes_((FLAC__byte**)(&object->data.picture.mime_type), (FLAC__byte*)mime_type, new_length+1))
1744                         return false;
1745         }
1746         else {
1747                 object->data.picture.mime_type = mime_type;
1748         }
1749
1750         if(0 != old)
1751                 free(old);
1752
1753         object->length -= old_length;
1754         object->length += new_length;
1755         return true;
1756 }
1757
1758 FLAC_API FLAC__bool FLAC__metadata_object_picture_set_description(FLAC__StreamMetadata *object, FLAC__byte *description, FLAC__bool copy)
1759 {
1760         FLAC__byte *old;
1761         size_t old_length, new_length;
1762
1763         FLAC__ASSERT(0 != object);
1764         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_PICTURE);
1765         FLAC__ASSERT(0 != description);
1766
1767         old = object->data.picture.description;
1768         old_length = old? strlen((const char *)old) : 0;
1769         new_length = strlen((const char *)description);
1770
1771         /* do the copy first so that if we fail we leave the object untouched */
1772         if(copy) {
1773                 if(new_length >= SIZE_MAX) /* overflow check */
1774                         return false;
1775                 if(!copy_bytes_(&object->data.picture.description, description, new_length+1))
1776                         return false;
1777         }
1778         else {
1779                 object->data.picture.description = description;
1780         }
1781
1782         if(0 != old)
1783                 free(old);
1784
1785         object->length -= old_length;
1786         object->length += new_length;
1787         return true;
1788 }
1789
1790 FLAC_API FLAC__bool FLAC__metadata_object_picture_set_data(FLAC__StreamMetadata *object, FLAC__byte *data, FLAC__uint32 length, FLAC__bool copy)
1791 {
1792         FLAC__byte *old;
1793
1794         FLAC__ASSERT(0 != object);
1795         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_PICTURE);
1796         FLAC__ASSERT((0 != data && length > 0) || (0 == data && length == 0 && copy == false));
1797
1798         old = object->data.picture.data;
1799
1800         /* do the copy first so that if we fail we leave the object untouched */
1801         if(copy) {
1802                 if(!copy_bytes_(&object->data.picture.data, data, length))
1803                         return false;
1804         }
1805         else {
1806                 object->data.picture.data = data;
1807         }
1808
1809         if(0 != old)
1810                 free(old);
1811
1812         object->length -= object->data.picture.data_length;
1813         object->data.picture.data_length = length;
1814         object->length += length;
1815         return true;
1816 }
1817
1818 FLAC_API FLAC__bool FLAC__metadata_object_picture_is_legal(const FLAC__StreamMetadata *object, const char **violation)
1819 {
1820         FLAC__ASSERT(0 != object);
1821         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_PICTURE);
1822
1823         return FLAC__format_picture_is_legal(&object->data.picture, violation);
1824 }