constify first arg of FLAC__metadata_object_vorbiscomment_find_entry_from()
[flac.git] / src / libFLAC / metadata_object.c
1 /* libFLAC - Free Lossless Audio Codec library
2  * Copyright (C) 2001,2002  Josh Coalson
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Library General Public
6  * License as published by the Free Software Foundation; either
7  * version 2 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * Library General Public License for more details.
13  *
14  * You should have received a copy of the GNU Library General Public
15  * License along with this library; if not, write to the
16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17  * Boston, MA  02111-1307, USA.
18  */
19
20 #include <stdlib.h>
21 #include <string.h>
22
23 #include "private/metadata.h"
24
25 #include "FLAC/assert.h"
26
27
28 /****************************************************************************
29  *
30  * Local routines
31  *
32  ***************************************************************************/
33
34 static FLAC__bool copy_bytes_(FLAC__byte **to, const FLAC__byte *from, unsigned bytes)
35 {
36         if(bytes > 0 && 0 != from) {
37                 FLAC__byte *x;
38                 if(0 == (x = malloc(bytes)))
39                         return false;
40                 memcpy(x, from, bytes);
41                 *to = x;
42         }
43         else {
44                 FLAC__ASSERT(0 == from);
45                 FLAC__ASSERT(bytes == 0);
46                 *to = 0;
47         }
48         return true;
49 }
50
51 static FLAC__bool copy_vcentry_(FLAC__StreamMetadata_VorbisComment_Entry *to, const FLAC__StreamMetadata_VorbisComment_Entry *from)
52 {
53         to->length = from->length;
54         if(0 == from->entry) {
55                 FLAC__ASSERT(from->length == 0);
56                 to->entry = 0;
57         }
58         else {
59                 FLAC__byte *x;
60                 FLAC__ASSERT(from->length > 0);
61                 if(0 == (x = malloc(from->length)))
62                         return false;
63                 memcpy(x, from->entry, from->length);
64                 to->entry = x;
65         }
66         return true;
67 }
68
69 static void seektable_calculate_length_(FLAC__StreamMetadata *object)
70 {
71         FLAC__ASSERT(0 != object);
72         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
73
74         object->length = object->data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
75 }
76
77 static FLAC__StreamMetadata_SeekPoint *seekpoint_array_new_(unsigned num_points)
78 {
79         FLAC__StreamMetadata_SeekPoint *object_array;
80
81         FLAC__ASSERT(num_points > 0);
82
83         object_array = malloc(num_points * sizeof(FLAC__StreamMetadata_SeekPoint));
84
85         if(0 != object_array) {
86                 unsigned i;
87                 for(i = 0; i < num_points; i++) {
88                         object_array[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
89                         object_array[i].stream_offset = 0;
90                         object_array[i].frame_samples = 0;
91                 }
92         }
93
94         return object_array;
95 }
96
97 static void vorbiscomment_calculate_length_(FLAC__StreamMetadata *object)
98 {
99         unsigned i;
100
101         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
102
103         object->length = (FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN) / 8;
104         object->length += object->data.vorbis_comment.vendor_string.length;
105         object->length += (FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8;
106         for(i = 0; i < object->data.vorbis_comment.num_comments; i++) {
107                 object->length += (FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8);
108                 object->length += object->data.vorbis_comment.comments[i].length;
109         }
110 }
111
112 static FLAC__StreamMetadata_VorbisComment_Entry *vorbiscomment_entry_array_new_(unsigned num_comments)
113 {
114         FLAC__ASSERT(num_comments > 0);
115
116         return calloc(num_comments, sizeof(FLAC__StreamMetadata_VorbisComment_Entry));
117 }
118
119 static void vorbiscomment_entry_array_delete_(FLAC__StreamMetadata_VorbisComment_Entry *object_array, unsigned num_comments)
120 {
121         unsigned i;
122
123         FLAC__ASSERT(0 != object_array && num_comments > 0);
124
125         for(i = 0; i < num_comments; i++)
126                 if(0 != object_array[i].entry)
127                         free(object_array[i].entry);
128
129         if(0 != object_array)
130                 free(object_array);
131 }
132
133 static FLAC__StreamMetadata_VorbisComment_Entry *vorbiscomment_entry_array_copy_(const FLAC__StreamMetadata_VorbisComment_Entry *object_array, unsigned num_comments)
134 {
135         FLAC__StreamMetadata_VorbisComment_Entry *return_array;
136
137         FLAC__ASSERT(0 != object_array);
138         FLAC__ASSERT(num_comments > 0);
139
140         return_array = vorbiscomment_entry_array_new_(num_comments);
141
142         if(0 != return_array) {
143                 unsigned i;
144
145                 /* Need to do this to set the pointers inside the comments to 0.
146                  * In case of an error in the following loop, the object will be
147                  * deleted and we don't want the destructor freeing uninitialized
148                  * pointers.
149                  */
150                 memset(return_array, 0, num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry));
151
152                 for(i = 0; i < num_comments; i++) {
153                         if(!copy_vcentry_(return_array+i, object_array+i)) {
154                                 vorbiscomment_entry_array_delete_(return_array, num_comments);
155                                 return 0;
156                         }
157                 }
158         }
159
160         return return_array;
161 }
162
163 static FLAC__bool vorbiscomment_set_entry_(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry *dest, const FLAC__StreamMetadata_VorbisComment_Entry *src, FLAC__bool copy)
164 {
165         FLAC__byte *save;
166
167         FLAC__ASSERT(0 != object);
168         FLAC__ASSERT(0 != dest);
169         FLAC__ASSERT(0 != src);
170         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
171         FLAC__ASSERT((0 != src->entry && src->length > 0) || (0 == src->entry && src->length == 0 && copy == false));
172
173         save = dest->entry;
174
175         /* do the copy first so that if we fail we leave the object untouched */
176         if(copy) {
177                 if(!copy_vcentry_(dest, src))
178                         return false;
179         }
180         else {
181                 *dest = *src;
182         }
183
184         if(0 != save)
185                 free(save);
186
187         vorbiscomment_calculate_length_(object);
188         return true;
189 }
190
191
192 /****************************************************************************
193  *
194  * Metadata object routines
195  *
196  ***************************************************************************/
197
198 FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_new(FLAC__MetadataType type)
199 {
200         FLAC__StreamMetadata *object = calloc(1, sizeof(FLAC__StreamMetadata));
201         if(0 != object) {
202                 object->is_last = false;
203                 object->type = type;
204                 switch(type) {
205                         case FLAC__METADATA_TYPE_STREAMINFO:
206                                 object->length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
207                                 break;
208                         case FLAC__METADATA_TYPE_PADDING:
209                                 break;
210                         case FLAC__METADATA_TYPE_APPLICATION:
211                                 object->length = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
212                                 break;
213                         case FLAC__METADATA_TYPE_SEEKTABLE:
214                                 break;
215                         case FLAC__METADATA_TYPE_VORBIS_COMMENT:
216                                 {
217                                         object->data.vorbis_comment.vendor_string.length = (unsigned)strlen(FLAC__VENDOR_STRING);
218                                         if(!copy_bytes_(&object->data.vorbis_comment.vendor_string.entry, (const FLAC__byte*)FLAC__VENDOR_STRING, object->data.vorbis_comment.vendor_string.length)) {
219                                                 free(object);
220                                                 return 0;
221                                         }
222                                         object->length =
223                                                 (FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8) +
224                                                 object->data.vorbis_comment.vendor_string.length +
225                                                 (FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN/8)
226                                         ;
227                                 }
228                                 break;
229                         default:
230                                 /* double protection: */
231                                 FLAC__ASSERT(0);
232                                 free(object);
233                                 return 0;
234                 }
235         }
236
237         return object;
238 }
239
240 FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_clone(const FLAC__StreamMetadata *object)
241 {
242         FLAC__StreamMetadata *to;
243
244         FLAC__ASSERT(0 != object);
245
246         if(0 != (to = FLAC__metadata_object_new(object->type))) {
247                 to->is_last = object->is_last;
248                 to->type = object->type;
249                 to->length = object->length;
250                 switch(to->type) {
251                         case FLAC__METADATA_TYPE_STREAMINFO:
252                                 memcpy(&to->data.stream_info, &object->data.stream_info, sizeof(FLAC__StreamMetadata_StreamInfo));
253                                 break;
254                         case FLAC__METADATA_TYPE_PADDING:
255                                 break;
256                         case FLAC__METADATA_TYPE_APPLICATION:
257                                 memcpy(&to->data.application.id, &object->data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8);
258                                 if(!copy_bytes_(&to->data.application.data, object->data.application.data, object->length - FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8)) {
259                                         FLAC__metadata_object_delete(to);
260                                         return 0;
261                                 }
262                                 break;
263                         case FLAC__METADATA_TYPE_SEEKTABLE:
264                                 to->data.seek_table.num_points = object->data.seek_table.num_points;
265                                 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))) {
266                                         FLAC__metadata_object_delete(to);
267                                         return 0;
268                                 }
269                                 break;
270                         case FLAC__METADATA_TYPE_VORBIS_COMMENT:
271                                 if(0 != to->data.vorbis_comment.vendor_string.entry)
272                                         free(to->data.vorbis_comment.vendor_string.entry);
273                                 if(!copy_vcentry_(&to->data.vorbis_comment.vendor_string, &object->data.vorbis_comment.vendor_string)) {
274                                         FLAC__metadata_object_delete(to);
275                                         return 0;
276                                 }
277                                 if(object->data.vorbis_comment.num_comments == 0) {
278                                         FLAC__ASSERT(0 == object->data.vorbis_comment.comments);
279                                         to->data.vorbis_comment.comments = 0;
280                                 }
281                                 else {
282                                         FLAC__ASSERT(0 != object->data.vorbis_comment.comments);
283                                         to->data.vorbis_comment.comments = vorbiscomment_entry_array_copy_(object->data.vorbis_comment.comments, object->data.vorbis_comment.num_comments);
284                                         if(0 == to->data.vorbis_comment.comments) {
285                                                 FLAC__metadata_object_delete(to);
286                                                 return 0;
287                                         }
288                                 }
289                                 to->data.vorbis_comment.num_comments = object->data.vorbis_comment.num_comments;
290                                 break;
291                         default:
292                                 /* double protection: */
293                                 FLAC__ASSERT(0);
294                                 free(to);
295                                 return 0;
296                 }
297         }
298
299         return to;
300 }
301
302 void FLAC__metadata_object_delete_data(FLAC__StreamMetadata *object)
303 {
304         FLAC__ASSERT(0 != object);
305
306         switch(object->type) {
307                 case FLAC__METADATA_TYPE_STREAMINFO:
308                 case FLAC__METADATA_TYPE_PADDING:
309                         break;
310                 case FLAC__METADATA_TYPE_APPLICATION:
311                         if(0 != object->data.application.data)
312                                 free(object->data.application.data);
313                         break;
314                 case FLAC__METADATA_TYPE_SEEKTABLE:
315                         if(0 != object->data.seek_table.points)
316                                 free(object->data.seek_table.points);
317                         break;
318                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
319                         if(0 != object->data.vorbis_comment.vendor_string.entry)
320                                 free(object->data.vorbis_comment.vendor_string.entry);
321                         if(0 != object->data.vorbis_comment.comments) {
322                                 FLAC__ASSERT(object->data.vorbis_comment.num_comments > 0);
323                                 vorbiscomment_entry_array_delete_(object->data.vorbis_comment.comments, object->data.vorbis_comment.num_comments);
324                         }
325                         break;
326                 default:
327                         FLAC__ASSERT(0);
328         }
329 }
330
331 FLAC_API void FLAC__metadata_object_delete(FLAC__StreamMetadata *object)
332 {
333         FLAC__metadata_object_delete_data(object);
334         free(object);
335 }
336
337 static FLAC__bool compare_block_data_streaminfo_(const FLAC__StreamMetadata_StreamInfo *block1, const FLAC__StreamMetadata_StreamInfo *block2)
338 {
339         if(block1->min_blocksize != block2->min_blocksize)
340                 return false;
341         if(block1->max_blocksize != block2->max_blocksize)
342                 return false;
343         if(block1->min_framesize != block2->min_framesize)
344                 return false;
345         if(block1->max_framesize != block2->max_framesize)
346                 return false;
347         if(block1->sample_rate != block2->sample_rate)
348                 return false;
349         if(block1->channels != block2->channels)
350                 return false;
351         if(block1->bits_per_sample != block2->bits_per_sample)
352                 return false;
353         if(block1->total_samples != block2->total_samples)
354                 return false;
355         if(0 != memcmp(block1->md5sum, block2->md5sum, 16))
356                 return false;
357         return true;
358 }
359
360 static FLAC__bool compare_block_data_application_(const FLAC__StreamMetadata_Application *block1, const FLAC__StreamMetadata_Application *block2, unsigned block_length)
361 {
362         FLAC__ASSERT(0 != block1);
363         FLAC__ASSERT(0 != block2);
364         FLAC__ASSERT(block_length >= sizeof(block1->id));
365
366         if(0 != memcmp(block1->id, block2->id, sizeof(block1->id)))
367                 return false;
368         if(0 != block1->data && 0 != block2->data)
369                 return 0 == memcmp(block1->data, block2->data, block_length - sizeof(block1->id));
370         else
371                 return block1->data == block2->data;
372 }
373
374 static FLAC__bool compare_block_data_seektable_(const FLAC__StreamMetadata_SeekTable *block1, const FLAC__StreamMetadata_SeekTable *block2)
375 {
376         unsigned i;
377
378         FLAC__ASSERT(0 != block1);
379         FLAC__ASSERT(0 != block2);
380
381         if(block1->num_points != block2->num_points)
382                 return false;
383
384         if(0 != block1->points && 0 != block2->points) {
385                 for(i = 0; i < block1->num_points; i++) {
386                         if(block1->points[i].sample_number != block2->points[i].sample_number)
387                                 return false;
388                         if(block1->points[i].stream_offset != block2->points[i].stream_offset)
389                                 return false;
390                         if(block1->points[i].frame_samples != block2->points[i].frame_samples)
391                                 return false;
392                 }
393                 return true;
394         }
395         else
396                 return block1->points == block2->points;
397 }
398
399 static FLAC__bool compare_block_data_vorbiscomment_(const FLAC__StreamMetadata_VorbisComment *block1, const FLAC__StreamMetadata_VorbisComment *block2)
400 {
401         unsigned i;
402
403         if(block1->vendor_string.length != block2->vendor_string.length)
404                 return false;
405
406         if(0 != block1->vendor_string.entry && 0 != block2->vendor_string.entry) {
407                 if(0 != memcmp(block1->vendor_string.entry, block2->vendor_string.entry, block1->vendor_string.length))
408                         return false;
409         }
410         else if(block1->vendor_string.entry != block2->vendor_string.entry)
411                 return false;
412
413         if(block1->num_comments != block2->num_comments)
414                 return false;
415
416         for(i = 0; i < block1->num_comments; i++) {
417                 if(0 != block1->comments[i].entry && 0 != block2->comments[i].entry) {
418                         if(0 != memcmp(block1->comments[i].entry, block2->comments[i].entry, block1->comments[i].length))
419                                 return false;
420                 }
421                 else if(block1->comments[i].entry != block2->comments[i].entry)
422                         return false;
423         }
424         return true;
425 }
426
427 FLAC_API FLAC__bool FLAC__metadata_object_is_equal(const FLAC__StreamMetadata *block1, const FLAC__StreamMetadata *block2)
428 {
429         FLAC__ASSERT(0 != block1);
430         FLAC__ASSERT(0 != block2);
431
432         if(block1->type != block2->type) {
433                 return false;
434         }
435         if(block1->is_last != block2->is_last) {
436                 return false;
437         }
438         if(block1->length != block2->length) {
439                 return false;
440         }
441         switch(block1->type) {
442                 case FLAC__METADATA_TYPE_STREAMINFO:
443                         return compare_block_data_streaminfo_(&block1->data.stream_info, &block2->data.stream_info);
444                 case FLAC__METADATA_TYPE_PADDING:
445                         return true; /* we don't compare the padding guts */
446                 case FLAC__METADATA_TYPE_APPLICATION:
447                         return compare_block_data_application_(&block1->data.application, &block2->data.application, block1->length);
448                 case FLAC__METADATA_TYPE_SEEKTABLE:
449                         return compare_block_data_seektable_(&block1->data.seek_table, &block2->data.seek_table);
450                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
451                         return compare_block_data_vorbiscomment_(&block1->data.vorbis_comment, &block2->data.vorbis_comment);
452                 default:
453                         FLAC__ASSERT(0);
454                         return false;
455         }
456 }
457
458 FLAC_API FLAC__bool FLAC__metadata_object_application_set_data(FLAC__StreamMetadata *object, FLAC__byte *data, unsigned length, FLAC__bool copy)
459 {
460         FLAC__byte *save;
461
462         FLAC__ASSERT(0 != object);
463         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_APPLICATION);
464         FLAC__ASSERT((0 != data && length > 0) || (0 == data && length == 0 && copy == false));
465
466         save = object->data.application.data;
467
468         /* do the copy first so that if we fail we leave the object untouched */
469         if(copy) {
470                 if(!copy_bytes_(&object->data.application.data, data, length))
471                         return false;
472         }
473         else {
474                 object->data.application.data = data;
475         }
476
477         if(0 != save)
478                 free(save);
479
480         object->length = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8 + length;
481         return true;
482 }
483
484 FLAC_API FLAC__bool FLAC__metadata_object_seektable_resize_points(FLAC__StreamMetadata *object, unsigned new_num_points)
485 {
486         FLAC__ASSERT(0 != object);
487         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
488
489         if(0 == object->data.seek_table.points) {
490                 FLAC__ASSERT(object->data.seek_table.num_points == 0);
491                 if(0 == new_num_points)
492                         return true;
493                 else if(0 == (object->data.seek_table.points = seekpoint_array_new_(new_num_points)))
494                         return false;
495         }
496         else {
497                 const unsigned old_size = object->data.seek_table.num_points * sizeof(FLAC__StreamMetadata_SeekPoint);
498                 const unsigned new_size = new_num_points * sizeof(FLAC__StreamMetadata_SeekPoint);
499
500                 FLAC__ASSERT(object->data.seek_table.num_points > 0);
501
502                 if(new_size == 0) {
503                         free(object->data.seek_table.points);
504                         object->data.seek_table.points = 0;
505                 }
506                 else if(0 == (object->data.seek_table.points = realloc(object->data.seek_table.points, new_size)))
507                         return false;
508
509                 /* if growing, set new elements to placeholders */
510                 if(new_size > old_size) {
511                         unsigned i;
512                         for(i = object->data.seek_table.num_points; i < new_num_points; i++) {
513                                 object->data.seek_table.points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
514                                 object->data.seek_table.points[i].stream_offset = 0;
515                                 object->data.seek_table.points[i].frame_samples = 0;
516                         }
517                 }
518         }
519
520         object->data.seek_table.num_points = new_num_points;
521
522         seektable_calculate_length_(object);
523         return true;
524 }
525
526 FLAC_API void FLAC__metadata_object_seektable_set_point(FLAC__StreamMetadata *object, unsigned point_num, FLAC__StreamMetadata_SeekPoint point)
527 {
528         FLAC__ASSERT(0 != object);
529         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
530         FLAC__ASSERT(object->data.seek_table.num_points > point_num);
531
532         object->data.seek_table.points[point_num] = point;
533 }
534
535 FLAC_API FLAC__bool FLAC__metadata_object_seektable_insert_point(FLAC__StreamMetadata *object, unsigned point_num, FLAC__StreamMetadata_SeekPoint point)
536 {
537         int i;
538
539         FLAC__ASSERT(0 != object);
540         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
541         FLAC__ASSERT(object->data.seek_table.num_points >= point_num);
542
543         if(!FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points+1))
544                 return false;
545
546         /* move all points >= point_num forward one space */
547         for(i = (int)object->data.seek_table.num_points-1; i > (int)point_num; i--)
548                 object->data.seek_table.points[i] = object->data.seek_table.points[i-1];
549
550         FLAC__metadata_object_seektable_set_point(object, point_num, point);
551         seektable_calculate_length_(object);
552         return true;
553 }
554
555 FLAC_API FLAC__bool FLAC__metadata_object_seektable_delete_point(FLAC__StreamMetadata *object, unsigned point_num)
556 {
557         unsigned i;
558
559         FLAC__ASSERT(0 != object);
560         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
561         FLAC__ASSERT(object->data.seek_table.num_points > point_num);
562
563         /* move all points > point_num backward one space */
564         for(i = point_num; i < object->data.seek_table.num_points-1; i++)
565                 object->data.seek_table.points[i] = object->data.seek_table.points[i+1];
566
567         return FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points-1);
568 }
569
570 FLAC_API FLAC__bool FLAC__metadata_object_seektable_is_legal(const FLAC__StreamMetadata *object)
571 {
572         FLAC__ASSERT(0 != object);
573         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
574
575         return FLAC__format_seektable_is_legal(&object->data.seek_table);
576 }
577
578 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_placeholders(FLAC__StreamMetadata *object, unsigned num)
579 {
580         FLAC__ASSERT(0 != object);
581         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
582
583         if(num > 0)
584                 /* WATCHOUT: we rely on the fact that growing the array adds PLACEHOLDERS at the end */
585                 return FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points + num);
586         else
587                 return true;
588 }
589
590 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_point(FLAC__StreamMetadata *object, FLAC__uint64 sample_number)
591 {
592         FLAC__StreamMetadata_SeekTable *seek_table;
593
594         FLAC__ASSERT(0 != object);
595         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
596
597         seek_table = &object->data.seek_table;
598
599         if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + 1))
600                 return false;
601
602         seek_table->points[seek_table->num_points - 1].sample_number = sample_number;
603         seek_table->points[seek_table->num_points - 1].stream_offset = 0;
604         seek_table->points[seek_table->num_points - 1].frame_samples = 0;
605
606         return true;
607 }
608
609 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_points(FLAC__StreamMetadata *object, FLAC__uint64 sample_numbers[], unsigned num)
610 {
611         FLAC__ASSERT(0 != object);
612         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
613         FLAC__ASSERT(0 != sample_numbers || num == 0);
614
615         if(num > 0) {
616                 FLAC__StreamMetadata_SeekTable *seek_table = &object->data.seek_table;
617                 unsigned i, j;
618
619                 i = seek_table->num_points;
620
621                 if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + num))
622                         return false;
623
624                 for(j = 0; j < num; i++, j++) {
625                         seek_table->points[i].sample_number = sample_numbers[j];
626                         seek_table->points[i].stream_offset = 0;
627                         seek_table->points[i].frame_samples = 0;
628                 }
629         }
630
631         return true;
632 }
633
634 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_spaced_points(FLAC__StreamMetadata *object, unsigned num, FLAC__uint64 total_samples)
635 {
636         FLAC__ASSERT(0 != object);
637         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
638         FLAC__ASSERT(total_samples > 0);
639
640         if(num > 0) {
641                 FLAC__StreamMetadata_SeekTable *seek_table = &object->data.seek_table;
642                 unsigned i, j;
643
644                 i = seek_table->num_points;
645
646                 if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + num))
647                         return false;
648
649                 for(j = 0; j < num; i++, j++) {
650                         seek_table->points[i].sample_number = total_samples * (FLAC__uint64)j / (FLAC__uint64)num;
651                         seek_table->points[i].stream_offset = 0;
652                         seek_table->points[i].frame_samples = 0;
653                 }
654         }
655
656         return true;
657 }
658
659 FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_sort(FLAC__StreamMetadata *object, FLAC__bool compact)
660 {
661         unsigned unique;
662
663         FLAC__ASSERT(0 != object);
664         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
665
666         unique = FLAC__format_seektable_sort(&object->data.seek_table);
667
668         return !compact || FLAC__metadata_object_seektable_resize_points(object, unique);
669 }
670
671 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_vendor_string(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
672 {
673         return vorbiscomment_set_entry_(object, &object->data.vorbis_comment.vendor_string, &entry, copy);
674 }
675
676 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_resize_comments(FLAC__StreamMetadata *object, unsigned new_num_comments)
677 {
678         FLAC__ASSERT(0 != object);
679         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
680
681         if(0 == object->data.vorbis_comment.comments) {
682                 FLAC__ASSERT(object->data.vorbis_comment.num_comments == 0);
683                 if(0 == new_num_comments)
684                         return true;
685                 else if(0 == (object->data.vorbis_comment.comments = vorbiscomment_entry_array_new_(new_num_comments)))
686                         return false;
687         }
688         else {
689                 const unsigned old_size = object->data.vorbis_comment.num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry);
690                 const unsigned new_size = new_num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry);
691
692                 FLAC__ASSERT(object->data.vorbis_comment.num_comments > 0);
693
694                 /* if shrinking, free the truncated entries */
695                 if(new_num_comments < object->data.vorbis_comment.num_comments) {
696                         unsigned i;
697                         for(i = new_num_comments; i < object->data.vorbis_comment.num_comments; i++)
698                                 if(0 != object->data.vorbis_comment.comments[i].entry)
699                                         free(object->data.vorbis_comment.comments[i].entry);
700                 }
701
702                 if(new_size == 0) {
703                         free(object->data.vorbis_comment.comments);
704                         object->data.vorbis_comment.comments = 0;
705                 }
706                 else if(0 == (object->data.vorbis_comment.comments = realloc(object->data.vorbis_comment.comments, new_size)))
707                         return false;
708
709                 /* if growing, zero all the length/pointers of new elements */
710                 if(new_size > old_size)
711                         memset(object->data.vorbis_comment.comments + object->data.vorbis_comment.num_comments, 0, new_size - old_size);
712         }
713
714         object->data.vorbis_comment.num_comments = new_num_comments;
715
716         vorbiscomment_calculate_length_(object);
717         return true;
718 }
719
720 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_comment(FLAC__StreamMetadata *object, unsigned comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
721 {
722         return vorbiscomment_set_entry_(object, &object->data.vorbis_comment.comments[comment_num], &entry, copy);
723 }
724
725 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_insert_comment(FLAC__StreamMetadata *object, unsigned comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
726 {
727         FLAC__StreamMetadata_VorbisComment *vc;
728
729         FLAC__ASSERT(0 != object);
730         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
731         FLAC__ASSERT(object->data.vorbis_comment.num_comments >= comment_num);
732
733         vc = &object->data.vorbis_comment;
734
735         if(!FLAC__metadata_object_vorbiscomment_resize_comments(object, vc->num_comments+1))
736                 return false;
737
738         /* move all comments >= comment_num forward one space */
739         memmove(&vc->comments[comment_num+1], &vc->comments[comment_num], sizeof(FLAC__StreamMetadata_VorbisComment_Entry)*(vc->num_comments-1-comment_num));
740         vc->comments[comment_num].length = 0;
741         vc->comments[comment_num].entry = 0;
742
743         return FLAC__metadata_object_vorbiscomment_set_comment(object, comment_num, entry, copy);
744 }
745
746 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_delete_comment(FLAC__StreamMetadata *object, unsigned comment_num)
747 {
748         FLAC__StreamMetadata_VorbisComment *vc;
749
750         FLAC__ASSERT(0 != object);
751         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
752         FLAC__ASSERT(object->data.vorbis_comment.num_comments > comment_num);
753
754         vc = &object->data.vorbis_comment;
755
756         /* free the comment at comment_num */
757         if(0 != vc->comments[comment_num].entry)
758                 free(vc->comments[comment_num].entry);
759
760         /* move all comments > comment_num backward one space */
761         memmove(&vc->comments[comment_num], &vc->comments[comment_num+1], sizeof(FLAC__StreamMetadata_VorbisComment_Entry)*(vc->num_comments-comment_num-1));
762         vc->comments[vc->num_comments-1].length = 0;
763         vc->comments[vc->num_comments-1].entry = 0;
764
765         return FLAC__metadata_object_vorbiscomment_resize_comments(object, vc->num_comments-1);
766 }
767
768 FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_matches(const FLAC__StreamMetadata_VorbisComment_Entry *entry, const char *field_name, unsigned field_name_length)
769 {
770         const FLAC__byte *eq = memchr(entry->entry, '=', entry->length);
771 #if defined _MSC_VER || defined __MINGW32__
772 #define FLAC__STRNCASECMP strnicmp
773 #else
774 #define FLAC__STRNCASECMP strncasecmp
775 #endif
776         return (0 != eq && (unsigned)(eq-entry->entry) == field_name_length && 0 == FLAC__STRNCASECMP(field_name, entry->entry, field_name_length));
777 #undef FLAC__STRNCASECMP
778 }
779
780 FLAC_API int FLAC__metadata_object_vorbiscomment_find_entry_from(const FLAC__StreamMetadata *object, unsigned offset, const char *field_name)
781 {
782         const unsigned field_name_length = strlen(field_name);
783         unsigned i;
784
785         FLAC__ASSERT(0 != object);
786         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
787
788         for(i = offset; i < object->data.vorbis_comment.num_comments; i++) {
789                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments + i, field_name, field_name_length))
790                         return (int)i;
791         }
792
793         return -1;
794 }
795
796 FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entry_matching(FLAC__StreamMetadata *object, const char *field_name)
797 {
798         const unsigned field_name_length = strlen(field_name);
799         unsigned i;
800
801         FLAC__ASSERT(0 != object);
802         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
803
804         for(i = 0; i < object->data.vorbis_comment.num_comments; i++) {
805                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments + i, field_name, field_name_length)) {
806                         if(!FLAC__metadata_object_vorbiscomment_delete_comment(object, i))
807                                 return -1;
808                         else
809                                 return 1;
810                 }
811         }
812
813         return 0;
814 }
815
816 FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entries_matching(FLAC__StreamMetadata *object, const char *field_name)
817 {
818         FLAC__bool ok = true;
819         unsigned matching = 0;
820         const unsigned field_name_length = strlen(field_name);
821         int i;
822
823         FLAC__ASSERT(0 != object);
824         FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
825
826         /* must delete from end to start otherwise it will interfere with our iteration */
827         for(i = (int)object->data.vorbis_comment.num_comments - 1; ok && i >= 0; i--) {
828                 if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments + i, field_name, field_name_length)) {
829                         matching++;
830                         ok &= FLAC__metadata_object_vorbiscomment_delete_comment(object, (unsigned)i);
831                 }
832         }
833
834         return ok? (int)matching : -1;
835 }