1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2001-2009 Josh Coalson
3 * Copyright (C) 2011-2013 Xiph.Org Foundation
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * - Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * - Neither the name of the Xiph.org Foundation nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #ifdef HAVE_CONFIG_H
34 # include <config.h>
35 #endif
36
37 #include <errno.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <stdarg.h>
42
43 #include <sys/stat.h> /* for stat(), maybe chmod() */
44
45 #include "private/metadata.h"
46
47 #include "FLAC/assert.h"
48 #include "FLAC/stream_decoder.h"
49 #include "share/alloc.h"
50 #include "share/compat.h"
51 #include "share/macros.h"
52 #include "share/safe_str.h"
53 #include "private/macros.h"
54 #include "private/memory.h"
55
56 #include <retro_miscellaneous.h>
57
58 /* Alias the first (in share/alloc.h) to the second (in src/libFLAC/memory.c). */
59 #define safe_malloc_mul_2op_ safe_malloc_mul_2op_p
60
61 /****************************************************************************
62 *
63 * Local function declarations
64 *
65 ***************************************************************************/
66
67 static void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
68 static void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
69 static void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes);
70 static FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes);
71 static FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes);
72 static FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes);
73
74 static FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator);
75 static FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block);
76 static FLAC__bool read_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__bool *is_last, FLAC__MetadataType *type, unsigned *length);
77 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata *block);
78 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block);
79 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_Padding *block, unsigned block_length);
80 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, unsigned block_length);
81 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, unsigned block_length);
82 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment_Entry *entry);
83 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment *block);
84 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track);
85 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block);
86 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Picture *block);
87 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, unsigned block_length);
88
89 static FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
90 static FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
91 static FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block);
92 static FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block);
93 static FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block);
94 static FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, unsigned block_length);
95 static FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, unsigned block_length);
96 static FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block);
97 static FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block);
98 static FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block);
99 static FLAC__bool write_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Picture *block);
100 static FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, unsigned block_length);
101
102 static FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block);
103 static FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last);
104 static FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append);
105
106 static void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator);
107 static FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator);
108
109 static unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb);
110 static unsigned seek_to_first_metadata_block_(FILE *f);
111
112 static FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append);
113 static FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, FLAC__off_t fixup_is_last_flag_offset, FLAC__bool backup);
114
115 static FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status);
116 static FLAC__bool copy_n_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status);
117 static FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status);
118 static FLAC__bool copy_remaining_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Eof eof_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__Metadata_SimpleIteratorStatus *status);
119
120 static FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
121 static FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
122 static void cleanup_tempfile_(FILE **tempfile, char **tempfilename);
123
124 static FLAC__bool get_file_stats_(const char *filename, struct flac_stat_s *stats);
125 static void set_file_stats_(const char *filename, struct flac_stat_s *stats);
126
127 static int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence);
128 static FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle);
129
130 static FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status);
131
132
133 #ifdef FLAC__VALGRIND_TESTING
local__fwrite(const void * ptr,size_t size,size_t nmemb,FILE * stream)134 static size_t local__fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
135 {
136 size_t ret = fwrite(ptr, size, nmemb, stream);
137 if(!ferror(stream))
138 fflush(stream);
139 return ret;
140 }
141 #else
142 #define local__fwrite fwrite
143 #endif
144
145 /****************************************************************************
146 *
147 * Level 0 implementation
148 *
149 ***************************************************************************/
150
151 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
152 static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
153 static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
154
155 typedef struct {
156 FLAC__bool got_error;
157 FLAC__StreamMetadata *object;
158 } level0_client_data;
159
get_one_metadata_block_(const char * filename,FLAC__MetadataType type)160 static FLAC__StreamMetadata *get_one_metadata_block_(const char *filename, FLAC__MetadataType type)
161 {
162 level0_client_data cd;
163 FLAC__StreamDecoder *decoder;
164
165 FLAC__ASSERT(0 != filename);
166
167 cd.got_error = false;
168 cd.object = 0;
169
170 decoder = FLAC__stream_decoder_new();
171
172 if(0 == decoder)
173 return 0;
174
175 FLAC__stream_decoder_set_md5_checking(decoder, false);
176 FLAC__stream_decoder_set_metadata_ignore_all(decoder);
177 FLAC__stream_decoder_set_metadata_respond(decoder, type);
178
179 if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, metadata_callback_, error_callback_, &cd) != FLAC__STREAM_DECODER_INIT_STATUS_OK || cd.got_error) {
180 (void)FLAC__stream_decoder_finish(decoder);
181 FLAC__stream_decoder_delete(decoder);
182 return 0;
183 }
184
185 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder) || cd.got_error) {
186 (void)FLAC__stream_decoder_finish(decoder);
187 FLAC__stream_decoder_delete(decoder);
188 if(0 != cd.object)
189 FLAC__metadata_object_delete(cd.object);
190 return 0;
191 }
192
193 (void)FLAC__stream_decoder_finish(decoder);
194 FLAC__stream_decoder_delete(decoder);
195
196 return cd.object;
197 }
198
FLAC__metadata_get_streaminfo(const char * filename,FLAC__StreamMetadata * streaminfo)199 FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo)
200 {
201 FLAC__StreamMetadata *object;
202
203 FLAC__ASSERT(0 != filename);
204 FLAC__ASSERT(0 != streaminfo);
205
206 object = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_STREAMINFO);
207
208 if (object) {
209 /* can just copy the contents since STREAMINFO has no internal structure */
210 *streaminfo = *object;
211 FLAC__metadata_object_delete(object);
212 return true;
213 }
214 else {
215 return false;
216 }
217 }
218
FLAC__metadata_get_tags(const char * filename,FLAC__StreamMetadata ** tags)219 FLAC_API FLAC__bool FLAC__metadata_get_tags(const char *filename, FLAC__StreamMetadata **tags)
220 {
221 FLAC__ASSERT(0 != filename);
222 FLAC__ASSERT(0 != tags);
223
224 *tags = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_VORBIS_COMMENT);
225
226 return 0 != *tags;
227 }
228
FLAC__metadata_get_cuesheet(const char * filename,FLAC__StreamMetadata ** cuesheet)229 FLAC_API FLAC__bool FLAC__metadata_get_cuesheet(const char *filename, FLAC__StreamMetadata **cuesheet)
230 {
231 FLAC__ASSERT(0 != filename);
232 FLAC__ASSERT(0 != cuesheet);
233
234 *cuesheet = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_CUESHEET);
235
236 return 0 != *cuesheet;
237 }
238
write_callback_(const FLAC__StreamDecoder * decoder,const FLAC__Frame * frame,const FLAC__int32 * const buffer[],void * client_data)239 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
240 {
241 (void)decoder, (void)frame, (void)buffer, (void)client_data;
242
243 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
244 }
245
metadata_callback_(const FLAC__StreamDecoder * decoder,const FLAC__StreamMetadata * metadata,void * client_data)246 void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
247 {
248 level0_client_data *cd = (level0_client_data *)client_data;
249 (void)decoder;
250
251 /*
252 * we assume we only get here when the one metadata block we were
253 * looking for was passed to us
254 */
255 if(!cd->got_error && 0 == cd->object) {
256 if(0 == (cd->object = FLAC__metadata_object_clone(metadata)))
257 cd->got_error = true;
258 }
259 }
260
error_callback_(const FLAC__StreamDecoder * decoder,FLAC__StreamDecoderErrorStatus status,void * client_data)261 void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
262 {
263 level0_client_data *cd = (level0_client_data *)client_data;
264 (void)decoder;
265
266 if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
267 cd->got_error = true;
268 }
269
FLAC__metadata_get_picture(const char * filename,FLAC__StreamMetadata ** picture,FLAC__StreamMetadata_Picture_Type type,const char * mime_type,const FLAC__byte * description,unsigned max_width,unsigned max_height,unsigned max_depth,unsigned max_colors)270 FLAC_API FLAC__bool FLAC__metadata_get_picture(const char *filename, FLAC__StreamMetadata **picture, FLAC__StreamMetadata_Picture_Type type, const char *mime_type, const FLAC__byte *description, unsigned max_width, unsigned max_height, unsigned max_depth, unsigned max_colors)
271 {
272 FLAC__Metadata_SimpleIterator *it;
273 FLAC__uint64 max_area_seen = 0;
274 FLAC__uint64 max_depth_seen = 0;
275
276 FLAC__ASSERT(0 != filename);
277 FLAC__ASSERT(0 != picture);
278
279 *picture = 0;
280
281 it = FLAC__metadata_simple_iterator_new();
282 if(0 == it)
283 return false;
284 if(!FLAC__metadata_simple_iterator_init(it, filename, /*read_only=*/true, /*preserve_file_stats=*/true)) {
285 FLAC__metadata_simple_iterator_delete(it);
286 return false;
287 }
288 do {
289 if(FLAC__metadata_simple_iterator_get_block_type(it) == FLAC__METADATA_TYPE_PICTURE) {
290 FLAC__StreamMetadata *obj = FLAC__metadata_simple_iterator_get_block(it);
291 FLAC__uint64 area = (FLAC__uint64)obj->data.picture.width * (FLAC__uint64)obj->data.picture.height;
292 /* check constraints */
293 if(
294 (type == (FLAC__StreamMetadata_Picture_Type)(-1) || type == obj->data.picture.type) &&
295 (mime_type == 0 || !strcmp(mime_type, obj->data.picture.mime_type)) &&
296 (description == 0 || !strcmp((const char *)description, (const char *)obj->data.picture.description)) &&
297 obj->data.picture.width <= max_width &&
298 obj->data.picture.height <= max_height &&
299 obj->data.picture.depth <= max_depth &&
300 obj->data.picture.colors <= max_colors &&
301 (area > max_area_seen || (area == max_area_seen && obj->data.picture.depth > max_depth_seen))
302 ) {
303 if(*picture)
304 FLAC__metadata_object_delete(*picture);
305 *picture = obj;
306 max_area_seen = area;
307 max_depth_seen = obj->data.picture.depth;
308 }
309 else {
310 FLAC__metadata_object_delete(obj);
311 }
312 }
313 } while(FLAC__metadata_simple_iterator_next(it));
314
315 FLAC__metadata_simple_iterator_delete(it);
316
317 return (0 != *picture);
318 }
319
320
321 /****************************************************************************
322 *
323 * Level 1 implementation
324 *
325 ***************************************************************************/
326
327 #define SIMPLE_ITERATOR_MAX_PUSH_DEPTH (1+4)
328 /* 1 for initial offset, +4 for our own personal use */
329
330 struct FLAC__Metadata_SimpleIterator {
331 FILE *file;
332 char *filename, *tempfile_path_prefix;
333 struct flac_stat_s stats;
334 FLAC__bool has_stats;
335 FLAC__bool is_writable;
336 FLAC__Metadata_SimpleIteratorStatus status;
337 FLAC__off_t offset[SIMPLE_ITERATOR_MAX_PUSH_DEPTH];
338 FLAC__off_t first_offset; /* this is the offset to the STREAMINFO block */
339 unsigned depth;
340 /* this is the metadata block header of the current block we are pointing to: */
341 FLAC__bool is_last;
342 FLAC__MetadataType type;
343 unsigned length;
344 };
345
346 FLAC_API const char * const FLAC__Metadata_SimpleIteratorStatusString[] = {
347 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK",
348 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT",
349 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE",
350 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE",
351 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE",
352 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA",
353 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR",
354 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR",
355 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR",
356 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR",
357 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR",
358 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR",
359 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR"
360 };
361
362
FLAC__metadata_simple_iterator_new(void)363 FLAC_API FLAC__Metadata_SimpleIterator *FLAC__metadata_simple_iterator_new(void)
364 {
365 FLAC__Metadata_SimpleIterator *iterator = calloc(1, sizeof(FLAC__Metadata_SimpleIterator));
366
367 if(0 != iterator) {
368 iterator->file = 0;
369 iterator->filename = 0;
370 iterator->tempfile_path_prefix = 0;
371 iterator->has_stats = false;
372 iterator->is_writable = false;
373 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
374 iterator->first_offset = iterator->offset[0] = -1;
375 iterator->depth = 0;
376 }
377
378 return iterator;
379 }
380
simple_iterator_free_guts_(FLAC__Metadata_SimpleIterator * iterator)381 static void simple_iterator_free_guts_(FLAC__Metadata_SimpleIterator *iterator)
382 {
383 FLAC__ASSERT(0 != iterator);
384
385 if(0 != iterator->file) {
386 fclose(iterator->file);
387 iterator->file = 0;
388 if(iterator->has_stats)
389 set_file_stats_(iterator->filename, &iterator->stats);
390 }
391 if(0 != iterator->filename) {
392 free(iterator->filename);
393 iterator->filename = 0;
394 }
395 if(0 != iterator->tempfile_path_prefix) {
396 free(iterator->tempfile_path_prefix);
397 iterator->tempfile_path_prefix = 0;
398 }
399 }
400
FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator * iterator)401 FLAC_API void FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator *iterator)
402 {
403 FLAC__ASSERT(0 != iterator);
404
405 simple_iterator_free_guts_(iterator);
406 free(iterator);
407 }
408
FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator * iterator)409 FLAC_API FLAC__Metadata_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator *iterator)
410 {
411 FLAC__Metadata_SimpleIteratorStatus status;
412
413 FLAC__ASSERT(0 != iterator);
414
415 status = iterator->status;
416 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
417 return status;
418 }
419
simple_iterator_prime_input_(FLAC__Metadata_SimpleIterator * iterator,FLAC__bool read_only)420 static FLAC__bool simple_iterator_prime_input_(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool read_only)
421 {
422 unsigned ret;
423
424 FLAC__ASSERT(0 != iterator);
425
426 if(read_only || 0 == (iterator->file = flac_fopen(iterator->filename, "r+b"))) {
427 iterator->is_writable = false;
428 if(read_only || errno == EACCES) {
429 if(0 == (iterator->file = flac_fopen(iterator->filename, "rb"))) {
430 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
431 return false;
432 }
433 }
434 else {
435 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
436 return false;
437 }
438 }
439 else {
440 iterator->is_writable = true;
441 }
442
443 ret = seek_to_first_metadata_block_(iterator->file);
444 switch(ret) {
445 case 0:
446 iterator->depth = 0;
447 iterator->first_offset = iterator->offset[iterator->depth] = ftello(iterator->file);
448 return read_metadata_block_header_(iterator);
449 case 1:
450 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
451 return false;
452 case 2:
453 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
454 return false;
455 case 3:
456 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE;
457 return false;
458 default:
459 FLAC__ASSERT(0);
460 return false;
461 }
462 }
463
FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator * iterator,const char * filename,FLAC__bool read_only,FLAC__bool preserve_file_stats)464 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool read_only, FLAC__bool preserve_file_stats)
465 {
466 const char *tempfile_path_prefix = 0; /*@@@ search for comments near 'flac_rename(...)' for what it will take to finish implementing this */
467
468 FLAC__ASSERT(0 != iterator);
469 FLAC__ASSERT(0 != filename);
470
471 simple_iterator_free_guts_(iterator);
472
473 if(!read_only && preserve_file_stats)
474 iterator->has_stats = get_file_stats_(filename, &iterator->stats);
475
476 if(0 == (iterator->filename = strdup(filename))) {
477 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
478 return false;
479 }
480 if(0 != tempfile_path_prefix && 0 == (iterator->tempfile_path_prefix = strdup(tempfile_path_prefix))) {
481 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
482 return false;
483 }
484
485 return simple_iterator_prime_input_(iterator, read_only);
486 }
487
FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator * iterator)488 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator *iterator)
489 {
490 FLAC__ASSERT(0 != iterator);
491 FLAC__ASSERT(0 != iterator->file);
492
493 return iterator->is_writable;
494 }
495
FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator * iterator)496 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator *iterator)
497 {
498 FLAC__ASSERT(0 != iterator);
499 FLAC__ASSERT(0 != iterator->file);
500
501 if(iterator->is_last)
502 return false;
503
504 if(0 != fseeko(iterator->file, iterator->length, SEEK_CUR)) {
505 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
506 return false;
507 }
508
509 iterator->offset[iterator->depth] = ftello(iterator->file);
510
511 return read_metadata_block_header_(iterator);
512 }
513
FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator * iterator)514 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator *iterator)
515 {
516 FLAC__off_t this_offset;
517
518 FLAC__ASSERT(0 != iterator);
519 FLAC__ASSERT(0 != iterator->file);
520
521 if(iterator->offset[iterator->depth] == iterator->first_offset)
522 return false;
523
524 if(0 != fseeko(iterator->file, iterator->first_offset, SEEK_SET)) {
525 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
526 return false;
527 }
528 this_offset = iterator->first_offset;
529 if(!read_metadata_block_header_(iterator))
530 return false;
531
532 /* we ignore any error from ftello() and catch it in fseeko() */
533 while(ftello(iterator->file) + (FLAC__off_t)iterator->length < iterator->offset[iterator->depth]) {
534 if(0 != fseeko(iterator->file, iterator->length, SEEK_CUR)) {
535 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
536 return false;
537 }
538 this_offset = ftello(iterator->file);
539 if(!read_metadata_block_header_(iterator))
540 return false;
541 }
542
543 iterator->offset[iterator->depth] = this_offset;
544
545 return true;
546 }
547
548 /*@@@@add to tests*/
FLAC__metadata_simple_iterator_is_last(const FLAC__Metadata_SimpleIterator * iterator)549 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_last(const FLAC__Metadata_SimpleIterator *iterator)
550 {
551 FLAC__ASSERT(0 != iterator);
552 FLAC__ASSERT(0 != iterator->file);
553
554 return iterator->is_last;
555 }
556
557 /*@@@@add to tests*/
FLAC__metadata_simple_iterator_get_block_offset(const FLAC__Metadata_SimpleIterator * iterator)558 FLAC_API off_t FLAC__metadata_simple_iterator_get_block_offset(const FLAC__Metadata_SimpleIterator *iterator)
559 {
560 FLAC__ASSERT(0 != iterator);
561 FLAC__ASSERT(0 != iterator->file);
562
563 return iterator->offset[iterator->depth];
564 }
565
FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator * iterator)566 FLAC_API FLAC__MetadataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator *iterator)
567 {
568 FLAC__ASSERT(0 != iterator);
569 FLAC__ASSERT(0 != iterator->file);
570
571 return iterator->type;
572 }
573
574 /*@@@@add to tests*/
FLAC__metadata_simple_iterator_get_block_length(const FLAC__Metadata_SimpleIterator * iterator)575 FLAC_API unsigned FLAC__metadata_simple_iterator_get_block_length(const FLAC__Metadata_SimpleIterator *iterator)
576 {
577 FLAC__ASSERT(0 != iterator);
578 FLAC__ASSERT(0 != iterator->file);
579
580 return iterator->length;
581 }
582
583 /*@@@@add to tests*/
FLAC__metadata_simple_iterator_get_application_id(FLAC__Metadata_SimpleIterator * iterator,FLAC__byte * id)584 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_get_application_id(FLAC__Metadata_SimpleIterator *iterator, FLAC__byte *id)
585 {
586 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
587
588 FLAC__ASSERT(0 != iterator);
589 FLAC__ASSERT(0 != iterator->file);
590 FLAC__ASSERT(0 != id);
591
592 if(iterator->type != FLAC__METADATA_TYPE_APPLICATION) {
593 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
594 return false;
595 }
596
597 if(fread(id, 1, id_bytes, iterator->file) != id_bytes) {
598 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
599 return false;
600 }
601
602 /* back up */
603 if(0 != fseeko(iterator->file, -((int)id_bytes), SEEK_CUR)) {
604 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
605 return false;
606 }
607
608 return true;
609 }
610
FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator * iterator)611 FLAC_API FLAC__StreamMetadata *FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator *iterator)
612 {
613 FLAC__StreamMetadata *block = FLAC__metadata_object_new(iterator->type);
614
615 FLAC__ASSERT(0 != iterator);
616 FLAC__ASSERT(0 != iterator->file);
617
618 if(0 != block) {
619 block->is_last = iterator->is_last;
620 block->length = iterator->length;
621
622 if(!read_metadata_block_data_(iterator, block)) {
623 FLAC__metadata_object_delete(block);
624 return 0;
625 }
626
627 /* back up to the beginning of the block data to stay consistent */
628 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH, SEEK_SET)) {
629 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
630 FLAC__metadata_object_delete(block);
631 return 0;
632 }
633 }
634 else
635 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
636
637 return block;
638 }
639
FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator * iterator,FLAC__StreamMetadata * block,FLAC__bool use_padding)640 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
641 {
642 FLAC__ASSERT_DECLARATION(FLAC__off_t debug_target_offset = iterator->offset[iterator->depth];)
643 FLAC__bool ret;
644
645 FLAC__ASSERT(0 != iterator);
646 FLAC__ASSERT(0 != iterator->file);
647 FLAC__ASSERT(0 != block);
648
649 if(!iterator->is_writable) {
650 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE;
651 return false;
652 }
653
654 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO || block->type == FLAC__METADATA_TYPE_STREAMINFO) {
655 if(iterator->type != block->type) {
656 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
657 return false;
658 }
659 }
660
661 block->is_last = iterator->is_last;
662
663 if(iterator->length == block->length)
664 return write_metadata_block_stationary_(iterator, block);
665 else if(iterator->length > block->length) {
666 if(use_padding && iterator->length >= FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) {
667 ret = write_metadata_block_stationary_with_padding_(iterator, block, iterator->length - FLAC__STREAM_METADATA_HEADER_LENGTH - block->length, block->is_last);
668 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
669 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
670 return ret;
671 }
672 else {
673 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
674 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
675 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
676 return ret;
677 }
678 }
679 else /* iterator->length < block->length */ {
680 unsigned padding_leftover = 0;
681 FLAC__bool padding_is_last = false;
682 if(use_padding) {
683 /* first see if we can even use padding */
684 if(iterator->is_last) {
685 use_padding = false;
686 }
687 else {
688 const unsigned extra_padding_bytes_required = block->length - iterator->length;
689 simple_iterator_push_(iterator);
690 if(!FLAC__metadata_simple_iterator_next(iterator)) {
691 (void)simple_iterator_pop_(iterator);
692 return false;
693 }
694 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
695 use_padding = false;
696 }
697 else {
698 if(FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length == extra_padding_bytes_required) {
699 padding_leftover = 0;
700 block->is_last = iterator->is_last;
701 }
702 else if(iterator->length < extra_padding_bytes_required)
703 use_padding = false;
704 else {
705 padding_leftover = FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length - extra_padding_bytes_required;
706 padding_is_last = iterator->is_last;
707 block->is_last = false;
708 }
709 }
710 if(!simple_iterator_pop_(iterator))
711 return false;
712 }
713 }
714 if(use_padding) {
715 if(padding_leftover == 0) {
716 ret = write_metadata_block_stationary_(iterator, block);
717 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
718 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
719 return ret;
720 }
721 else {
722 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
723 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
724 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
725 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
726 return ret;
727 }
728 }
729 else {
730 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
731 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
732 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
733 return ret;
734 }
735 }
736 }
737
FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator * iterator,FLAC__StreamMetadata * block,FLAC__bool use_padding)738 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
739 {
740 unsigned padding_leftover = 0;
741 FLAC__bool padding_is_last = false;
742
743 FLAC__ASSERT_DECLARATION(FLAC__off_t debug_target_offset = iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length;)
744 FLAC__bool ret;
745
746 FLAC__ASSERT(0 != iterator);
747 FLAC__ASSERT(0 != iterator->file);
748 FLAC__ASSERT(0 != block);
749
750 if(!iterator->is_writable)
751 return false;
752
753 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) {
754 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
755 return false;
756 }
757
758 block->is_last = iterator->is_last;
759
760 if(use_padding) {
761 /* first see if we can even use padding */
762 if(iterator->is_last) {
763 use_padding = false;
764 }
765 else {
766 simple_iterator_push_(iterator);
767 if(!FLAC__metadata_simple_iterator_next(iterator)) {
768 (void)simple_iterator_pop_(iterator);
769 return false;
770 }
771 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
772 use_padding = false;
773 }
774 else {
775 if(iterator->length == block->length) {
776 padding_leftover = 0;
777 block->is_last = iterator->is_last;
778 }
779 else if(iterator->length < FLAC__STREAM_METADATA_HEADER_LENGTH + block->length)
780 use_padding = false;
781 else {
782 padding_leftover = iterator->length - block->length;
783 padding_is_last = iterator->is_last;
784 block->is_last = false;
785 }
786 }
787 if(!simple_iterator_pop_(iterator))
788 return false;
789 }
790 }
791 if(use_padding) {
792 /* move to the next block, which is suitable padding */
793 if(!FLAC__metadata_simple_iterator_next(iterator))
794 return false;
795 if(padding_leftover == 0) {
796 ret = write_metadata_block_stationary_(iterator, block);
797 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
798 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
799 return ret;
800 }
801 else {
802 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
803 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
804 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
805 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
806 return ret;
807 }
808 }
809 else {
810 ret = rewrite_whole_file_(iterator, block, /*append=*/true);
811 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
812 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
813 return ret;
814 }
815 }
816
FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator * iterator,FLAC__bool use_padding)817 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool use_padding)
818 {
819 FLAC__ASSERT_DECLARATION(FLAC__off_t debug_target_offset = iterator->offset[iterator->depth];)
820 FLAC__bool ret;
821
822 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO) {
823 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
824 return false;
825 }
826
827 if(use_padding) {
828 FLAC__StreamMetadata *padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
829 if(0 == padding) {
830 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
831 return false;
832 }
833 padding->length = iterator->length;
834 if(!FLAC__metadata_simple_iterator_set_block(iterator, padding, false)) {
835 FLAC__metadata_object_delete(padding);
836 return false;
837 }
838 FLAC__metadata_object_delete(padding);
839 if(!FLAC__metadata_simple_iterator_prev(iterator))
840 return false;
841 FLAC__ASSERT(iterator->offset[iterator->depth] + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length == debug_target_offset);
842 FLAC__ASSERT(ftello(iterator->file) + (FLAC__off_t)iterator->length == debug_target_offset);
843 return true;
844 }
845 else {
846 ret = rewrite_whole_file_(iterator, 0, /*append=*/false);
847 FLAC__ASSERT(iterator->offset[iterator->depth] + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length == debug_target_offset);
848 FLAC__ASSERT(ftello(iterator->file) + (FLAC__off_t)iterator->length == debug_target_offset);
849 return ret;
850 }
851 }
852
853
854
855 /****************************************************************************
856 *
857 * Level 2 implementation
858 *
859 ***************************************************************************/
860
861
862 typedef struct FLAC__Metadata_Node {
863 FLAC__StreamMetadata *data;
864 struct FLAC__Metadata_Node *prev, *next;
865 } FLAC__Metadata_Node;
866
867 struct FLAC__Metadata_Chain {
868 char *filename; /* will be NULL if using callbacks */
869 FLAC__bool is_ogg;
870 FLAC__Metadata_Node *head;
871 FLAC__Metadata_Node *tail;
872 unsigned nodes;
873 FLAC__Metadata_ChainStatus status;
874 FLAC__off_t first_offset, last_offset;
875 /*
876 * This is the length of the chain initially read from the FLAC file.
877 * it is used to compare against the current length to decide whether
878 * or not the whole file has to be rewritten.
879 */
880 FLAC__off_t initial_length;
881 /* @@@ hacky, these are currently only needed by ogg reader */
882 FLAC__IOHandle handle;
883 FLAC__IOCallback_Read read_cb;
884 };
885
886 struct FLAC__Metadata_Iterator {
887 FLAC__Metadata_Chain *chain;
888 FLAC__Metadata_Node *current;
889 };
890
891 FLAC_API const char * const FLAC__Metadata_ChainStatusString[] = {
892 "FLAC__METADATA_CHAIN_STATUS_OK",
893 "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT",
894 "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE",
895 "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE",
896 "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE",
897 "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA",
898 "FLAC__METADATA_CHAIN_STATUS_READ_ERROR",
899 "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR",
900 "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR",
901 "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR",
902 "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR",
903 "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR",
904 "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR",
905 "FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS",
906 "FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH",
907 "FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL"
908 };
909
910
node_new_(void)911 static FLAC__Metadata_Node *node_new_(void)
912 {
913 return calloc(1, sizeof(FLAC__Metadata_Node));
914 }
915
node_delete_(FLAC__Metadata_Node * node)916 static void node_delete_(FLAC__Metadata_Node *node)
917 {
918 FLAC__ASSERT(0 != node);
919 if(0 != node->data)
920 FLAC__metadata_object_delete(node->data);
921 free(node);
922 }
923
chain_init_(FLAC__Metadata_Chain * chain)924 static void chain_init_(FLAC__Metadata_Chain *chain)
925 {
926 FLAC__ASSERT(0 != chain);
927
928 chain->filename = 0;
929 chain->is_ogg = false;
930 chain->head = chain->tail = 0;
931 chain->nodes = 0;
932 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
933 chain->initial_length = 0;
934 chain->read_cb = 0;
935 }
936
chain_clear_(FLAC__Metadata_Chain * chain)937 static void chain_clear_(FLAC__Metadata_Chain *chain)
938 {
939 FLAC__Metadata_Node *node, *next;
940
941 FLAC__ASSERT(0 != chain);
942
943 for(node = chain->head; node; ) {
944 next = node->next;
945 node_delete_(node);
946 node = next;
947 }
948
949 if(0 != chain->filename)
950 free(chain->filename);
951
952 chain_init_(chain);
953 }
954
chain_append_node_(FLAC__Metadata_Chain * chain,FLAC__Metadata_Node * node)955 static void chain_append_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
956 {
957 FLAC__ASSERT(0 != chain);
958 FLAC__ASSERT(0 != node);
959 FLAC__ASSERT(0 != node->data);
960
961 node->next = node->prev = 0;
962 node->data->is_last = true;
963 if(0 != chain->tail)
964 chain->tail->data->is_last = false;
965
966 if(0 == chain->head)
967 chain->head = node;
968 else {
969 FLAC__ASSERT(0 != chain->tail);
970 chain->tail->next = node;
971 node->prev = chain->tail;
972 }
973 chain->tail = node;
974 chain->nodes++;
975 }
976
chain_remove_node_(FLAC__Metadata_Chain * chain,FLAC__Metadata_Node * node)977 static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
978 {
979 FLAC__ASSERT(0 != chain);
980 FLAC__ASSERT(0 != node);
981
982 if(node == chain->head)
983 chain->head = node->next;
984 else
985 node->prev->next = node->next;
986
987 if(node == chain->tail)
988 chain->tail = node->prev;
989 else
990 node->next->prev = node->prev;
991
992 if(0 != chain->tail)
993 chain->tail->data->is_last = true;
994
995 chain->nodes--;
996 }
997
chain_delete_node_(FLAC__Metadata_Chain * chain,FLAC__Metadata_Node * node)998 static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
999 {
1000 chain_remove_node_(chain, node);
1001 node_delete_(node);
1002 }
1003
chain_calculate_length_(FLAC__Metadata_Chain * chain)1004 static FLAC__off_t chain_calculate_length_(FLAC__Metadata_Chain *chain)
1005 {
1006 const FLAC__Metadata_Node *node;
1007 FLAC__off_t length = 0;
1008 for(node = chain->head; node; node = node->next)
1009 length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1010 return length;
1011 }
1012
iterator_insert_node_(FLAC__Metadata_Iterator * iterator,FLAC__Metadata_Node * node)1013 static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
1014 {
1015 FLAC__ASSERT(0 != node);
1016 FLAC__ASSERT(0 != node->data);
1017 FLAC__ASSERT(0 != iterator);
1018 FLAC__ASSERT(0 != iterator->current);
1019 FLAC__ASSERT(0 != iterator->chain);
1020 FLAC__ASSERT(0 != iterator->chain->head);
1021 FLAC__ASSERT(0 != iterator->chain->tail);
1022
1023 node->data->is_last = false;
1024
1025 node->prev = iterator->current->prev;
1026 node->next = iterator->current;
1027
1028 if(0 == node->prev)
1029 iterator->chain->head = node;
1030 else
1031 node->prev->next = node;
1032
1033 iterator->current->prev = node;
1034
1035 iterator->chain->nodes++;
1036 }
1037
iterator_insert_node_after_(FLAC__Metadata_Iterator * iterator,FLAC__Metadata_Node * node)1038 static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
1039 {
1040 FLAC__ASSERT(0 != node);
1041 FLAC__ASSERT(0 != node->data);
1042 FLAC__ASSERT(0 != iterator);
1043 FLAC__ASSERT(0 != iterator->current);
1044 FLAC__ASSERT(0 != iterator->chain);
1045 FLAC__ASSERT(0 != iterator->chain->head);
1046 FLAC__ASSERT(0 != iterator->chain->tail);
1047
1048 iterator->current->data->is_last = false;
1049
1050 node->prev = iterator->current;
1051 node->next = iterator->current->next;
1052
1053 if(0 == node->next)
1054 iterator->chain->tail = node;
1055 else
1056 node->next->prev = node;
1057
1058 node->prev->next = node;
1059
1060 iterator->chain->tail->data->is_last = true;
1061
1062 iterator->chain->nodes++;
1063 }
1064
1065 /* return true iff node and node->next are both padding */
chain_merge_adjacent_padding_(FLAC__Metadata_Chain * chain,FLAC__Metadata_Node * node)1066 static FLAC__bool chain_merge_adjacent_padding_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
1067 {
1068 if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) {
1069 const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length;
1070 node->data->length += growth;
1071
1072 chain_delete_node_(chain, node->next);
1073 return true;
1074 }
1075 else
1076 return false;
1077 }
1078
1079 /* Returns the new length of the chain, or 0 if there was an error. */
1080 /* WATCHOUT: This can get called multiple times before a write, so
1081 * it should still work when this happens.
1082 */
1083 /* WATCHOUT: Make sure to also update the logic in
1084 * FLAC__metadata_chain_check_if_tempfile_needed() if the logic here changes.
1085 */
chain_prepare_for_write_(FLAC__Metadata_Chain * chain,FLAC__bool use_padding)1086 static FLAC__off_t chain_prepare_for_write_(FLAC__Metadata_Chain *chain, FLAC__bool use_padding)
1087 {
1088 FLAC__off_t current_length = chain_calculate_length_(chain);
1089
1090 if(use_padding) {
1091 /* if the metadata shrank and the last block is padding, we just extend the last padding block */
1092 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1093 const FLAC__off_t delta = chain->initial_length - current_length;
1094 chain->tail->data->length += delta;
1095 current_length += delta;
1096 FLAC__ASSERT(current_length == chain->initial_length);
1097 }
1098 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */
1099 else if(current_length + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
1100 FLAC__StreamMetadata *padding;
1101 FLAC__Metadata_Node *node;
1102 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) {
1103 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1104 return 0;
1105 }
1106 padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + current_length);
1107 if(0 == (node = node_new_())) {
1108 FLAC__metadata_object_delete(padding);
1109 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1110 return 0;
1111 }
1112 node->data = padding;
1113 chain_append_node_(chain, node);
1114 current_length = chain_calculate_length_(chain);
1115 FLAC__ASSERT(current_length == chain->initial_length);
1116 }
1117 /* if the metadata grew but the last block is padding, try cutting the padding to restore the original length so we don't have to rewrite the whole file */
1118 else if(current_length > chain->initial_length) {
1119 const FLAC__off_t delta = current_length - chain->initial_length;
1120 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1121 /* if the delta is exactly the size of the last padding block, remove the padding block */
1122 if((FLAC__off_t)chain->tail->data->length + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH == delta) {
1123 chain_delete_node_(chain, chain->tail);
1124 current_length = chain_calculate_length_(chain);
1125 FLAC__ASSERT(current_length == chain->initial_length);
1126 }
1127 /* if there is at least 'delta' bytes of padding, trim the padding down */
1128 else if((FLAC__off_t)chain->tail->data->length >= delta) {
1129 chain->tail->data->length -= delta;
1130 current_length -= delta;
1131 FLAC__ASSERT(current_length == chain->initial_length);
1132 }
1133 }
1134 }
1135 }
1136
1137 return current_length;
1138 }
1139
chain_read_cb_(FLAC__Metadata_Chain * chain,FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__IOCallback_Seek seek_cb,FLAC__IOCallback_Tell tell_cb)1140 static FLAC__bool chain_read_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__IOCallback_Tell tell_cb)
1141 {
1142 FLAC__Metadata_Node *node;
1143
1144 FLAC__ASSERT(0 != chain);
1145
1146 /* we assume we're already at the beginning of the file */
1147
1148 switch(seek_to_first_metadata_block_cb_(handle, read_cb, seek_cb)) {
1149 case 0:
1150 break;
1151 case 1:
1152 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1153 return false;
1154 case 2:
1155 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1156 return false;
1157 case 3:
1158 chain->status = FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
1159 return false;
1160 default:
1161 FLAC__ASSERT(0);
1162 return false;
1163 }
1164
1165 {
1166 FLAC__int64 pos = tell_cb(handle);
1167 if(pos < 0) {
1168 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1169 return false;
1170 }
1171 chain->first_offset = (FLAC__off_t)pos;
1172 }
1173
1174 {
1175 FLAC__bool is_last;
1176 FLAC__MetadataType type;
1177 unsigned length;
1178
1179 do {
1180 node = node_new_();
1181 if(0 == node) {
1182 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1183 return false;
1184 }
1185
1186 if(!read_metadata_block_header_cb_(handle, read_cb, &is_last, &type, &length)) {
1187 node_delete_(node);
1188 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1189 return false;
1190 }
1191
1192 node->data = FLAC__metadata_object_new(type);
1193 if(0 == node->data) {
1194 node_delete_(node);
1195 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1196 return false;
1197 }
1198
1199 node->data->is_last = is_last;
1200 node->data->length = length;
1201
1202 chain->status = get_equivalent_status_(read_metadata_block_data_cb_(handle, read_cb, seek_cb, node->data));
1203 if(chain->status != FLAC__METADATA_CHAIN_STATUS_OK) {
1204 node_delete_(node);
1205 return false;
1206 }
1207 chain_append_node_(chain, node);
1208 } while(!is_last);
1209 }
1210
1211 {
1212 FLAC__int64 pos = tell_cb(handle);
1213 if(pos < 0) {
1214 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1215 return false;
1216 }
1217 chain->last_offset = (FLAC__off_t)pos;
1218 }
1219
1220 chain->initial_length = chain_calculate_length_(chain);
1221
1222 return true;
1223 }
1224
chain_read_ogg_read_cb_(const FLAC__StreamDecoder * decoder,FLAC__byte buffer[],size_t * bytes,void * client_data)1225 static FLAC__StreamDecoderReadStatus chain_read_ogg_read_cb_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
1226 {
1227 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data;
1228 (void)decoder;
1229 if(*bytes > 0 && chain->status == FLAC__METADATA_CHAIN_STATUS_OK) {
1230 *bytes = chain->read_cb(buffer, sizeof(FLAC__byte), *bytes, chain->handle);
1231 if(*bytes == 0)
1232 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
1233 else
1234 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
1235 }
1236 else
1237 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
1238 }
1239
chain_read_ogg_write_cb_(const FLAC__StreamDecoder * decoder,const FLAC__Frame * frame,const FLAC__int32 * const buffer[],void * client_data)1240 static FLAC__StreamDecoderWriteStatus chain_read_ogg_write_cb_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
1241 {
1242 (void)decoder, (void)frame, (void)buffer, (void)client_data;
1243 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
1244 }
1245
chain_read_ogg_metadata_cb_(const FLAC__StreamDecoder * decoder,const FLAC__StreamMetadata * metadata,void * client_data)1246 static void chain_read_ogg_metadata_cb_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
1247 {
1248 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data;
1249 FLAC__Metadata_Node *node;
1250
1251 (void)decoder;
1252
1253 node = node_new_();
1254 if(0 == node) {
1255 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1256 return;
1257 }
1258
1259 node->data = FLAC__metadata_object_clone(metadata);
1260 if(0 == node->data) {
1261 node_delete_(node);
1262 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1263 return;
1264 }
1265
1266 chain_append_node_(chain, node);
1267 }
1268
chain_read_ogg_error_cb_(const FLAC__StreamDecoder * decoder,FLAC__StreamDecoderErrorStatus status,void * client_data)1269 static void chain_read_ogg_error_cb_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
1270 {
1271 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data;
1272 (void)decoder, (void)status;
1273 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */
1274 }
1275
chain_read_ogg_cb_(FLAC__Metadata_Chain * chain,FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb)1276 static FLAC__bool chain_read_ogg_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb)
1277 {
1278 FLAC__StreamDecoder *decoder;
1279
1280 FLAC__ASSERT(0 != chain);
1281
1282 /* we assume we're already at the beginning of the file */
1283
1284 chain->handle = handle;
1285 chain->read_cb = read_cb;
1286 if(0 == (decoder = FLAC__stream_decoder_new())) {
1287 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1288 return false;
1289 }
1290 FLAC__stream_decoder_set_metadata_respond_all(decoder);
1291 if(FLAC__stream_decoder_init_ogg_stream(decoder, chain_read_ogg_read_cb_, /*seek_callback=*/0, /*tell_callback=*/0, /*length_callback=*/0, /*eof_callback=*/0, chain_read_ogg_write_cb_, chain_read_ogg_metadata_cb_, chain_read_ogg_error_cb_, chain) != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
1292 FLAC__stream_decoder_delete(decoder);
1293 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */
1294 return false;
1295 }
1296
1297 chain->first_offset = 0; /*@@@ wrong; will need to be set correctly to implement metadata writing for Ogg FLAC */
1298
1299 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder))
1300 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */
1301 if(chain->status != FLAC__METADATA_CHAIN_STATUS_OK) {
1302 FLAC__stream_decoder_delete(decoder);
1303 return false;
1304 }
1305
1306 FLAC__stream_decoder_delete(decoder);
1307
1308 chain->last_offset = 0; /*@@@ wrong; will need to be set correctly to implement metadata writing for Ogg FLAC */
1309
1310 chain->initial_length = chain_calculate_length_(chain);
1311
1312 return true;
1313 }
1314
chain_rewrite_metadata_in_place_cb_(FLAC__Metadata_Chain * chain,FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,FLAC__IOCallback_Seek seek_cb)1315 static FLAC__bool chain_rewrite_metadata_in_place_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, FLAC__IOCallback_Seek seek_cb)
1316 {
1317 FLAC__Metadata_Node *node;
1318
1319 FLAC__ASSERT(0 != chain);
1320 FLAC__ASSERT(0 != chain->head);
1321
1322 if(0 != seek_cb(handle, chain->first_offset, SEEK_SET)) {
1323 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1324 return false;
1325 }
1326
1327 for(node = chain->head; node; node = node->next) {
1328 if(!write_metadata_block_header_cb_(handle, write_cb, node->data)) {
1329 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1330 return false;
1331 }
1332 if(!write_metadata_block_data_cb_(handle, write_cb, node->data)) {
1333 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1334 return false;
1335 }
1336 }
1337
1338 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1339
1340 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
1341 return true;
1342 }
1343
chain_rewrite_metadata_in_place_(FLAC__Metadata_Chain * chain)1344 static FLAC__bool chain_rewrite_metadata_in_place_(FLAC__Metadata_Chain *chain)
1345 {
1346 FILE *file;
1347 FLAC__bool ret;
1348
1349 FLAC__ASSERT(0 != chain->filename);
1350
1351 if(0 == (file = flac_fopen(chain->filename, "r+b"))) {
1352 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1353 return false;
1354 }
1355
1356 /* chain_rewrite_metadata_in_place_cb_() sets chain->status for us */
1357 ret = chain_rewrite_metadata_in_place_cb_(chain, (FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, fseek_wrapper_);
1358
1359 fclose(file);
1360
1361 return ret;
1362 }
1363
chain_rewrite_file_(FLAC__Metadata_Chain * chain,const char * tempfile_path_prefix)1364 static FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix)
1365 {
1366 FILE *f, *tempfile = NULL;
1367 char *tempfilename;
1368 FLAC__Metadata_SimpleIteratorStatus status;
1369 const FLAC__Metadata_Node *node;
1370
1371 FLAC__ASSERT(0 != chain);
1372 FLAC__ASSERT(0 != chain->filename);
1373 FLAC__ASSERT(0 != chain->head);
1374
1375 /* copy the file prefix (data up to first metadata block */
1376 if(0 == (f = flac_fopen(chain->filename, "rb"))) {
1377 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1378 return false;
1379 }
1380 if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) {
1381 chain->status = get_equivalent_status_(status);
1382 goto err;
1383 }
1384 if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) {
1385 chain->status = get_equivalent_status_(status);
1386 goto err;
1387 }
1388
1389 /* write the metadata */
1390 for(node = chain->head; node; node = node->next) {
1391 if(!write_metadata_block_header_(tempfile, &status, node->data)) {
1392 chain->status = get_equivalent_status_(status);
1393 goto err;
1394 }
1395 if(!write_metadata_block_data_(tempfile, &status, node->data)) {
1396 chain->status = get_equivalent_status_(status);
1397 goto err;
1398 }
1399 }
1400 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1401
1402 /* copy the file postfix (everything after the metadata) */
1403 if(0 != fseeko(f, chain->last_offset, SEEK_SET)) {
1404 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1405 goto err;
1406 }
1407 if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) {
1408 chain->status = get_equivalent_status_(status);
1409 goto err;
1410 }
1411
1412 /* move the tempfile on top of the original */
1413 (void)fclose(f);
1414 if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status))
1415 return false;
1416
1417 return true;
1418
1419 err:
1420 (void)fclose(f);
1421 cleanup_tempfile_(&tempfile, &tempfilename);
1422 return false;
1423 }
1424
1425 /* assumes 'handle' is already at beginning of file */
chain_rewrite_file_cb_(FLAC__Metadata_Chain * chain,FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__IOCallback_Seek seek_cb,FLAC__IOCallback_Eof eof_cb,FLAC__IOHandle temp_handle,FLAC__IOCallback_Write temp_write_cb)1426 static FLAC__bool chain_rewrite_file_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__IOCallback_Eof eof_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb)
1427 {
1428 FLAC__Metadata_SimpleIteratorStatus status;
1429 const FLAC__Metadata_Node *node;
1430
1431 FLAC__ASSERT(0 != chain);
1432 FLAC__ASSERT(0 == chain->filename);
1433 FLAC__ASSERT(0 != chain->head);
1434
1435 /* copy the file prefix (data up to first metadata block */
1436 if(!copy_n_bytes_from_file_cb_(handle, read_cb, temp_handle, temp_write_cb, chain->first_offset, &status)) {
1437 chain->status = get_equivalent_status_(status);
1438 return false;
1439 }
1440
1441 /* write the metadata */
1442 for(node = chain->head; node; node = node->next) {
1443 if(!write_metadata_block_header_cb_(temp_handle, temp_write_cb, node->data)) {
1444 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1445 return false;
1446 }
1447 if(!write_metadata_block_data_cb_(temp_handle, temp_write_cb, node->data)) {
1448 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1449 return false;
1450 }
1451 }
1452 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1453
1454 /* copy the file postfix (everything after the metadata) */
1455 if(0 != seek_cb(handle, chain->last_offset, SEEK_SET)) {
1456 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1457 return false;
1458 }
1459 if(!copy_remaining_bytes_from_file_cb_(handle, read_cb, eof_cb, temp_handle, temp_write_cb, &status)) {
1460 chain->status = get_equivalent_status_(status);
1461 return false;
1462 }
1463
1464 return true;
1465 }
1466
FLAC__metadata_chain_new(void)1467 FLAC_API FLAC__Metadata_Chain *FLAC__metadata_chain_new(void)
1468 {
1469 FLAC__Metadata_Chain *chain = calloc(1, sizeof(FLAC__Metadata_Chain));
1470
1471 if(0 != chain)
1472 chain_init_(chain);
1473
1474 return chain;
1475 }
1476
FLAC__metadata_chain_delete(FLAC__Metadata_Chain * chain)1477 FLAC_API void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain)
1478 {
1479 FLAC__ASSERT(0 != chain);
1480
1481 chain_clear_(chain);
1482
1483 free(chain);
1484 }
1485
FLAC__metadata_chain_status(FLAC__Metadata_Chain * chain)1486 FLAC_API FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain)
1487 {
1488 FLAC__Metadata_ChainStatus status;
1489
1490 FLAC__ASSERT(0 != chain);
1491
1492 status = chain->status;
1493 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
1494 return status;
1495 }
1496
chain_read_(FLAC__Metadata_Chain * chain,const char * filename,FLAC__bool is_ogg)1497 static FLAC__bool chain_read_(FLAC__Metadata_Chain *chain, const char *filename, FLAC__bool is_ogg)
1498 {
1499 FILE *file;
1500 FLAC__bool ret;
1501
1502 FLAC__ASSERT(0 != chain);
1503 FLAC__ASSERT(0 != filename);
1504
1505 chain_clear_(chain);
1506
1507 if(0 == (chain->filename = strdup(filename))) {
1508 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1509 return false;
1510 }
1511
1512 chain->is_ogg = is_ogg;
1513
1514 if(0 == (file = flac_fopen(filename, "rb"))) {
1515 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1516 return false;
1517 }
1518
1519 /* the function also sets chain->status for us */
1520 ret = is_ogg?
1521 chain_read_ogg_cb_(chain, file, (FLAC__IOCallback_Read)fread) :
1522 chain_read_cb_(chain, file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, ftell_wrapper_)
1523 ;
1524
1525 fclose(file);
1526
1527 return ret;
1528 }
1529
FLAC__metadata_chain_read(FLAC__Metadata_Chain * chain,const char * filename)1530 FLAC_API FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename)
1531 {
1532 return chain_read_(chain, filename, /*is_ogg=*/false);
1533 }
1534
1535 /*@@@@add to tests*/
FLAC__metadata_chain_read_ogg(FLAC__Metadata_Chain * chain,const char * filename)1536 FLAC_API FLAC__bool FLAC__metadata_chain_read_ogg(FLAC__Metadata_Chain *chain, const char *filename)
1537 {
1538 return chain_read_(chain, filename, /*is_ogg=*/true);
1539 }
1540
chain_read_with_callbacks_(FLAC__Metadata_Chain * chain,FLAC__IOHandle handle,FLAC__IOCallbacks callbacks,FLAC__bool is_ogg)1541 static FLAC__bool chain_read_with_callbacks_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks, FLAC__bool is_ogg)
1542 {
1543 FLAC__bool ret;
1544
1545 FLAC__ASSERT(0 != chain);
1546
1547 chain_clear_(chain);
1548
1549 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.tell) {
1550 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1551 return false;
1552 }
1553
1554 chain->is_ogg = is_ogg;
1555
1556 /* rewind */
1557 if(0 != callbacks.seek(handle, 0, SEEK_SET)) {
1558 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1559 return false;
1560 }
1561
1562 /* the function also sets chain->status for us */
1563 ret = is_ogg?
1564 chain_read_ogg_cb_(chain, handle, callbacks.read) :
1565 chain_read_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.tell)
1566 ;
1567
1568 return ret;
1569 }
1570
FLAC__metadata_chain_read_with_callbacks(FLAC__Metadata_Chain * chain,FLAC__IOHandle handle,FLAC__IOCallbacks callbacks)1571 FLAC_API FLAC__bool FLAC__metadata_chain_read_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1572 {
1573 return chain_read_with_callbacks_(chain, handle, callbacks, /*is_ogg=*/false);
1574 }
1575
1576 /*@@@@add to tests*/
FLAC__metadata_chain_read_ogg_with_callbacks(FLAC__Metadata_Chain * chain,FLAC__IOHandle handle,FLAC__IOCallbacks callbacks)1577 FLAC_API FLAC__bool FLAC__metadata_chain_read_ogg_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1578 {
1579 return chain_read_with_callbacks_(chain, handle, callbacks, /*is_ogg=*/true);
1580 }
1581
FLAC__metadata_chain_check_if_tempfile_needed(FLAC__Metadata_Chain * chain,FLAC__bool use_padding)1582 FLAC_API FLAC__bool FLAC__metadata_chain_check_if_tempfile_needed(FLAC__Metadata_Chain *chain, FLAC__bool use_padding)
1583 {
1584 /* This does all the same checks that are in chain_prepare_for_write_()
1585 * but doesn't actually alter the chain. Make sure to update the logic
1586 * here if chain_prepare_for_write_() changes.
1587 */
1588 const FLAC__off_t current_length = chain_calculate_length_(chain);
1589
1590 FLAC__ASSERT(0 != chain);
1591
1592 if(use_padding) {
1593 /* if the metadata shrank and the last block is padding, we just extend the last padding block */
1594 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING)
1595 return false;
1596 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */
1597 else if(current_length + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length)
1598 return false;
1599 /* if the metadata grew but the last block is padding, try cutting the padding to restore the original length so we don't have to rewrite the whole file */
1600 else if(current_length > chain->initial_length) {
1601 const FLAC__off_t delta = current_length - chain->initial_length;
1602 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1603 /* if the delta is exactly the size of the last padding block, remove the padding block */
1604 if((FLAC__off_t)chain->tail->data->length + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH == delta)
1605 return false;
1606 /* if there is at least 'delta' bytes of padding, trim the padding down */
1607 else if((FLAC__off_t)chain->tail->data->length >= delta)
1608 return false;
1609 }
1610 }
1611 }
1612
1613 return (current_length != chain->initial_length);
1614 }
1615
FLAC__metadata_chain_write(FLAC__Metadata_Chain * chain,FLAC__bool use_padding,FLAC__bool preserve_file_stats)1616 FLAC_API FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats)
1617 {
1618 struct flac_stat_s stats;
1619 const char *tempfile_path_prefix = 0;
1620 FLAC__off_t current_length;
1621
1622 FLAC__ASSERT(0 != chain);
1623
1624 if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */
1625 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;
1626 return false;
1627 }
1628
1629 if (0 == chain->filename) {
1630 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1631 return false;
1632 }
1633
1634 current_length = chain_prepare_for_write_(chain, use_padding);
1635
1636 /* a return value of 0 means there was an error; chain->status is already set */
1637 if (0 == current_length)
1638 return false;
1639
1640 if(preserve_file_stats)
1641 get_file_stats_(chain->filename, &stats);
1642
1643 if(current_length == chain->initial_length) {
1644 if(!chain_rewrite_metadata_in_place_(chain))
1645 return false;
1646 }
1647 else {
1648 if(!chain_rewrite_file_(chain, tempfile_path_prefix))
1649 return false;
1650
1651 /* recompute lengths and offsets */
1652 {
1653 const FLAC__Metadata_Node *node;
1654 chain->initial_length = current_length;
1655 chain->last_offset = chain->first_offset;
1656 for(node = chain->head; node; node = node->next)
1657 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1658 }
1659 }
1660
1661 if(preserve_file_stats)
1662 set_file_stats_(chain->filename, &stats);
1663
1664 return true;
1665 }
1666
FLAC__metadata_chain_write_with_callbacks(FLAC__Metadata_Chain * chain,FLAC__bool use_padding,FLAC__IOHandle handle,FLAC__IOCallbacks callbacks)1667 FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1668 {
1669 FLAC__off_t current_length;
1670
1671 FLAC__ASSERT(0 != chain);
1672
1673 if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */
1674 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;
1675 return false;
1676 }
1677
1678 if (0 != chain->filename) {
1679 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1680 return false;
1681 }
1682
1683 if (0 == callbacks.write || 0 == callbacks.seek) {
1684 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1685 return false;
1686 }
1687
1688 if (FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) {
1689 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL;
1690 return false;
1691 }
1692
1693 current_length = chain_prepare_for_write_(chain, use_padding);
1694
1695 /* a return value of 0 means there was an error; chain->status is already set */
1696 if (0 == current_length)
1697 return false;
1698
1699 FLAC__ASSERT(current_length == chain->initial_length);
1700
1701 return chain_rewrite_metadata_in_place_cb_(chain, handle, callbacks.write, callbacks.seek);
1702 }
1703
FLAC__metadata_chain_write_with_callbacks_and_tempfile(FLAC__Metadata_Chain * chain,FLAC__bool use_padding,FLAC__IOHandle handle,FLAC__IOCallbacks callbacks,FLAC__IOHandle temp_handle,FLAC__IOCallbacks temp_callbacks)1704 FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks_and_tempfile(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks, FLAC__IOHandle temp_handle, FLAC__IOCallbacks temp_callbacks)
1705 {
1706 FLAC__off_t current_length;
1707
1708 FLAC__ASSERT(0 != chain);
1709
1710 if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */
1711 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;
1712 return false;
1713 }
1714
1715 if (0 != chain->filename) {
1716 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1717 return false;
1718 }
1719
1720 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.eof) {
1721 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1722 return false;
1723 }
1724 if (0 == temp_callbacks.write) {
1725 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1726 return false;
1727 }
1728
1729 if (!FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) {
1730 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL;
1731 return false;
1732 }
1733
1734 current_length = chain_prepare_for_write_(chain, use_padding);
1735
1736 /* a return value of 0 means there was an error; chain->status is already set */
1737 if (0 == current_length)
1738 return false;
1739
1740 FLAC__ASSERT(current_length != chain->initial_length);
1741
1742 /* rewind */
1743 if(0 != callbacks.seek(handle, 0, SEEK_SET)) {
1744 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1745 return false;
1746 }
1747
1748 if(!chain_rewrite_file_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.eof, temp_handle, temp_callbacks.write))
1749 return false;
1750
1751 /* recompute lengths and offsets */
1752 {
1753 const FLAC__Metadata_Node *node;
1754 chain->initial_length = current_length;
1755 chain->last_offset = chain->first_offset;
1756 for(node = chain->head; node; node = node->next)
1757 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1758 }
1759
1760 return true;
1761 }
1762
FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain * chain)1763 FLAC_API void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain)
1764 {
1765 FLAC__Metadata_Node *node;
1766
1767 FLAC__ASSERT(0 != chain);
1768
1769 for(node = chain->head; node; ) {
1770 if(!chain_merge_adjacent_padding_(chain, node))
1771 node = node->next;
1772 }
1773 }
1774
FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain * chain)1775 FLAC_API void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain)
1776 {
1777 FLAC__Metadata_Node *node, *save;
1778 unsigned i;
1779
1780 FLAC__ASSERT(0 != chain);
1781
1782 /*
1783 * Don't try and be too smart... this simple algo is good enough for
1784 * the small number of nodes that we deal with.
1785 */
1786 for(i = 0, node = chain->head; i < chain->nodes; i++) {
1787 if(node->data->type == FLAC__METADATA_TYPE_PADDING) {
1788 save = node->next;
1789 chain_remove_node_(chain, node);
1790 chain_append_node_(chain, node);
1791 node = save;
1792 }
1793 else {
1794 node = node->next;
1795 }
1796 }
1797
1798 FLAC__metadata_chain_merge_padding(chain);
1799 }
1800
1801
FLAC__metadata_iterator_new(void)1802 FLAC_API FLAC__Metadata_Iterator *FLAC__metadata_iterator_new(void)
1803 {
1804 FLAC__Metadata_Iterator *iterator = calloc(1, sizeof(FLAC__Metadata_Iterator));
1805
1806 /* calloc() implies:
1807 iterator->current = 0;
1808 iterator->chain = 0;
1809 */
1810
1811 return iterator;
1812 }
1813
FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator * iterator)1814 FLAC_API void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator)
1815 {
1816 FLAC__ASSERT(0 != iterator);
1817
1818 free(iterator);
1819 }
1820
FLAC__metadata_iterator_init(FLAC__Metadata_Iterator * iterator,FLAC__Metadata_Chain * chain)1821 FLAC_API void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain)
1822 {
1823 FLAC__ASSERT(0 != iterator);
1824 FLAC__ASSERT(0 != chain);
1825 FLAC__ASSERT(0 != chain->head);
1826
1827 iterator->chain = chain;
1828 iterator->current = chain->head;
1829 }
1830
FLAC__metadata_iterator_next(FLAC__Metadata_Iterator * iterator)1831 FLAC_API FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator)
1832 {
1833 FLAC__ASSERT(0 != iterator);
1834
1835 if(0 == iterator->current || 0 == iterator->current->next)
1836 return false;
1837
1838 iterator->current = iterator->current->next;
1839 return true;
1840 }
1841
FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator * iterator)1842 FLAC_API FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator)
1843 {
1844 FLAC__ASSERT(0 != iterator);
1845
1846 if(0 == iterator->current || 0 == iterator->current->prev)
1847 return false;
1848
1849 iterator->current = iterator->current->prev;
1850 return true;
1851 }
1852
FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator * iterator)1853 FLAC_API FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator)
1854 {
1855 FLAC__ASSERT(0 != iterator);
1856 FLAC__ASSERT(0 != iterator->current);
1857 FLAC__ASSERT(0 != iterator->current->data);
1858
1859 return iterator->current->data->type;
1860 }
1861
FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator * iterator)1862 FLAC_API FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator)
1863 {
1864 FLAC__ASSERT(0 != iterator);
1865 FLAC__ASSERT(0 != iterator->current);
1866
1867 return iterator->current->data;
1868 }
1869
FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator * iterator,FLAC__StreamMetadata * block)1870 FLAC_API FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1871 {
1872 FLAC__ASSERT(0 != iterator);
1873 FLAC__ASSERT(0 != block);
1874 return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block);
1875 }
1876
FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator * iterator,FLAC__bool replace_with_padding)1877 FLAC_API FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding)
1878 {
1879 FLAC__Metadata_Node *save;
1880
1881 FLAC__ASSERT(0 != iterator);
1882 FLAC__ASSERT(0 != iterator->current);
1883
1884 if(0 == iterator->current->prev) {
1885 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1886 return false;
1887 }
1888
1889 save = iterator->current->prev;
1890
1891 if(replace_with_padding) {
1892 FLAC__metadata_object_delete_data(iterator->current->data);
1893 iterator->current->data->type = FLAC__METADATA_TYPE_PADDING;
1894 }
1895 else {
1896 chain_delete_node_(iterator->chain, iterator->current);
1897 }
1898
1899 iterator->current = save;
1900 return true;
1901 }
1902
FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator * iterator,FLAC__StreamMetadata * block)1903 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1904 {
1905 FLAC__Metadata_Node *node;
1906
1907 FLAC__ASSERT(0 != iterator);
1908 FLAC__ASSERT(0 != iterator->current);
1909 FLAC__ASSERT(0 != block);
1910
1911 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1912 return false;
1913
1914 if(0 == iterator->current->prev) {
1915 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1916 return false;
1917 }
1918
1919 if(0 == (node = node_new_()))
1920 return false;
1921
1922 node->data = block;
1923 iterator_insert_node_(iterator, node);
1924 iterator->current = node;
1925 return true;
1926 }
1927
FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator * iterator,FLAC__StreamMetadata * block)1928 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1929 {
1930 FLAC__Metadata_Node *node;
1931
1932 FLAC__ASSERT(0 != iterator);
1933 FLAC__ASSERT(0 != iterator->current);
1934 FLAC__ASSERT(0 != block);
1935
1936 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1937 return false;
1938
1939 if(0 == (node = node_new_()))
1940 return false;
1941
1942 node->data = block;
1943 iterator_insert_node_after_(iterator, node);
1944 iterator->current = node;
1945 return true;
1946 }
1947
1948
1949 /****************************************************************************
1950 *
1951 * Local function definitions
1952 *
1953 ***************************************************************************/
1954
pack_uint32_(FLAC__uint32 val,FLAC__byte * b,unsigned bytes)1955 void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1956 {
1957 unsigned i;
1958
1959 b += bytes;
1960
1961 for(i = 0; i < bytes; i++) {
1962 *(--b) = (FLAC__byte)(val & 0xff);
1963 val >>= 8;
1964 }
1965 }
1966
pack_uint32_little_endian_(FLAC__uint32 val,FLAC__byte * b,unsigned bytes)1967 void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1968 {
1969 unsigned i;
1970
1971 for(i = 0; i < bytes; i++) {
1972 *(b++) = (FLAC__byte)(val & 0xff);
1973 val >>= 8;
1974 }
1975 }
1976
pack_uint64_(FLAC__uint64 val,FLAC__byte * b,unsigned bytes)1977 void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes)
1978 {
1979 unsigned i;
1980
1981 b += bytes;
1982
1983 for(i = 0; i < bytes; i++) {
1984 *(--b) = (FLAC__byte)(val & 0xff);
1985 val >>= 8;
1986 }
1987 }
1988
unpack_uint32_(FLAC__byte * b,unsigned bytes)1989 FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes)
1990 {
1991 FLAC__uint32 ret = 0;
1992 unsigned i;
1993
1994 for(i = 0; i < bytes; i++)
1995 ret = (ret << 8) | (FLAC__uint32)(*b++);
1996
1997 return ret;
1998 }
1999
unpack_uint32_little_endian_(FLAC__byte * b,unsigned bytes)2000 FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes)
2001 {
2002 FLAC__uint32 ret = 0;
2003 unsigned i;
2004
2005 b += bytes;
2006
2007 for(i = 0; i < bytes; i++)
2008 ret = (ret << 8) | (FLAC__uint32)(*--b);
2009
2010 return ret;
2011 }
2012
unpack_uint64_(FLAC__byte * b,unsigned bytes)2013 FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes)
2014 {
2015 FLAC__uint64 ret = 0;
2016 unsigned i;
2017
2018 for(i = 0; i < bytes; i++)
2019 ret = (ret << 8) | (FLAC__uint64)(*b++);
2020
2021 return ret;
2022 }
2023
read_metadata_block_header_(FLAC__Metadata_SimpleIterator * iterator)2024 FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator)
2025 {
2026 FLAC__ASSERT(0 != iterator);
2027 FLAC__ASSERT(0 != iterator->file);
2028
2029 if(!read_metadata_block_header_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, &iterator->is_last, &iterator->type, &iterator->length)) {
2030 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2031 return false;
2032 }
2033
2034 return true;
2035 }
2036
read_metadata_block_data_(FLAC__Metadata_SimpleIterator * iterator,FLAC__StreamMetadata * block)2037 FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block)
2038 {
2039 FLAC__ASSERT(0 != iterator);
2040 FLAC__ASSERT(0 != iterator->file);
2041
2042 iterator->status = read_metadata_block_data_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, block);
2043
2044 return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
2045 }
2046
read_metadata_block_header_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__bool * is_last,FLAC__MetadataType * type,unsigned * length)2047 FLAC__bool read_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__bool *is_last, FLAC__MetadataType *type, unsigned *length)
2048 {
2049 FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH];
2050
2051 if(read_cb(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH)
2052 return false;
2053
2054 *is_last = raw_header[0] & 0x80? true : false;
2055 *type = (FLAC__MetadataType)(raw_header[0] & 0x7f);
2056 *length = unpack_uint32_(raw_header + 1, 3);
2057
2058 /* Note that we don't check:
2059 * if(iterator->type >= FLAC__METADATA_TYPE_UNDEFINED)
2060 * we just will read in an opaque block
2061 */
2062
2063 return true;
2064 }
2065
read_metadata_block_data_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__IOCallback_Seek seek_cb,FLAC__StreamMetadata * block)2066 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata *block)
2067 {
2068 switch(block->type) {
2069 case FLAC__METADATA_TYPE_STREAMINFO:
2070 return read_metadata_block_data_streaminfo_cb_(handle, read_cb, &block->data.stream_info);
2071 case FLAC__METADATA_TYPE_PADDING:
2072 return read_metadata_block_data_padding_cb_(handle, seek_cb, &block->data.padding, block->length);
2073 case FLAC__METADATA_TYPE_APPLICATION:
2074 return read_metadata_block_data_application_cb_(handle, read_cb, &block->data.application, block->length);
2075 case FLAC__METADATA_TYPE_SEEKTABLE:
2076 return read_metadata_block_data_seektable_cb_(handle, read_cb, &block->data.seek_table, block->length);
2077 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
2078 return read_metadata_block_data_vorbis_comment_cb_(handle, read_cb, &block->data.vorbis_comment);
2079 case FLAC__METADATA_TYPE_CUESHEET:
2080 return read_metadata_block_data_cuesheet_cb_(handle, read_cb, &block->data.cue_sheet);
2081 case FLAC__METADATA_TYPE_PICTURE:
2082 return read_metadata_block_data_picture_cb_(handle, read_cb, &block->data.picture);
2083 default:
2084 return read_metadata_block_data_unknown_cb_(handle, read_cb, &block->data.unknown, block->length);
2085 }
2086 }
2087
read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_StreamInfo * block)2088 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block)
2089 {
2090 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b;
2091
2092 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
2093 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2094
2095 b = buffer;
2096
2097 /* we are using hardcoded numbers for simplicity but we should
2098 * probably eventually write a bit-level unpacker and use the
2099 * _STREAMINFO_ constants.
2100 */
2101 block->min_blocksize = unpack_uint32_(b, 2); b += 2;
2102 block->max_blocksize = unpack_uint32_(b, 2); b += 2;
2103 block->min_framesize = unpack_uint32_(b, 3); b += 3;
2104 block->max_framesize = unpack_uint32_(b, 3); b += 3;
2105 block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4);
2106 block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
2107 block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 4) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1;
2108 block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4);
2109 memcpy(block->md5sum, b+8, 16);
2110
2111 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2112 }
2113
read_metadata_block_data_padding_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Seek seek_cb,FLAC__StreamMetadata_Padding * block,unsigned block_length)2114 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_Padding *block, unsigned block_length)
2115 {
2116 (void)block; /* nothing to do; we don't care about reading the padding bytes */
2117
2118 if(0 != seek_cb(handle, block_length, SEEK_CUR))
2119 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2120
2121 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2122 }
2123
read_metadata_block_data_application_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_Application * block,unsigned block_length)2124 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, unsigned block_length)
2125 {
2126 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
2127
2128 if(read_cb(block->id, 1, id_bytes, handle) != id_bytes)
2129 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2130
2131 if(block_length < id_bytes)
2132 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2133
2134 block_length -= id_bytes;
2135
2136 if(block_length == 0) {
2137 block->data = 0;
2138 }
2139 else {
2140 if(0 == (block->data = malloc(block_length)))
2141 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2142
2143 if(read_cb(block->data, 1, block_length, handle) != block_length)
2144 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2145 }
2146
2147 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2148 }
2149
read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_SeekTable * block,unsigned block_length)2150 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, unsigned block_length)
2151 {
2152 unsigned i;
2153 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
2154
2155 FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0);
2156
2157 block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
2158
2159 if(block->num_points == 0)
2160 block->points = 0;
2161 else if(0 == (block->points = safe_malloc_mul_2op_p(block->num_points, /*times*/sizeof(FLAC__StreamMetadata_SeekPoint))))
2162 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2163
2164 for(i = 0; i < block->num_points; i++) {
2165 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
2166 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2167 /* some MAGIC NUMBERs here */
2168 block->points[i].sample_number = unpack_uint64_(buffer, 8);
2169 block->points[i].stream_offset = unpack_uint64_(buffer+8, 8);
2170 block->points[i].frame_samples = unpack_uint32_(buffer+16, 2);
2171 }
2172
2173 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2174 }
2175
read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_VorbisComment_Entry * entry)2176 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment_Entry *entry)
2177 {
2178 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
2179 FLAC__byte buffer[4]; /* magic number is asserted below */
2180
2181 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8 == sizeof(buffer));
2182
2183 if(read_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2184 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2185 entry->length = unpack_uint32_little_endian_(buffer, entry_length_len);
2186
2187 if(0 != entry->entry)
2188 free(entry->entry);
2189
2190 if(entry->length == 0) {
2191 entry->entry = 0;
2192 }
2193 else {
2194 if(0 == (entry->entry = safe_malloc_add_2op_(entry->length, /*+*/1)))
2195 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2196
2197 if(read_cb(entry->entry, 1, entry->length, handle) != entry->length)
2198 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2199
2200 entry->entry[entry->length] = '\0';
2201 }
2202
2203 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2204 }
2205
read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_VorbisComment * block)2206 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment *block)
2207 {
2208 unsigned i;
2209 FLAC__Metadata_SimpleIteratorStatus status;
2210 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
2211 FLAC__byte buffer[4]; /* magic number is asserted below */
2212
2213 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8 == sizeof(buffer));
2214
2215 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, &(block->vendor_string))))
2216 return status;
2217
2218 if(read_cb(buffer, 1, num_comments_len, handle) != num_comments_len)
2219 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2220 block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len);
2221
2222 if(block->num_comments == 0) {
2223 block->comments = 0;
2224 }
2225 else if(0 == (block->comments = calloc(block->num_comments, sizeof(FLAC__StreamMetadata_VorbisComment_Entry))))
2226 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2227
2228 for(i = 0; i < block->num_comments; i++) {
2229 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, block->comments + i)))
2230 return status;
2231 }
2232
2233 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2234 }
2235
read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_CueSheet_Track * track)2236 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track)
2237 {
2238 unsigned i, len;
2239 FLAC__byte buffer[32]; /* asserted below that this is big enough */
2240
2241 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
2242 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
2243 FLAC__ASSERT(sizeof(buffer) >= (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8);
2244
2245 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
2246 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
2247 if(read_cb(buffer, 1, len, handle) != len)
2248 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2249 track->offset = unpack_uint64_(buffer, len);
2250
2251 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
2252 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
2253 if(read_cb(buffer, 1, len, handle) != len)
2254 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2255 track->number = (FLAC__byte)unpack_uint32_(buffer, len);
2256
2257 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
2258 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
2259 if(read_cb(track->isrc, 1, len, handle) != len)
2260 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2261
2262 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) % 8 == 0);
2263 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
2264 if(read_cb(buffer, 1, len, handle) != len)
2265 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2266 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN == 1);
2267 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN == 1);
2268 track->type = buffer[0] >> 7;
2269 track->pre_emphasis = (buffer[0] >> 6) & 1;
2270
2271 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
2272 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
2273 if(read_cb(buffer, 1, len, handle) != len)
2274 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2275 track->num_indices = (FLAC__byte)unpack_uint32_(buffer, len);
2276
2277 if(track->num_indices == 0) {
2278 track->indices = 0;
2279 }
2280 else if(0 == (track->indices = calloc(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index))))
2281 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2282
2283 for(i = 0; i < track->num_indices; i++) {
2284 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
2285 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
2286 if(read_cb(buffer, 1, len, handle) != len)
2287 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2288 track->indices[i].offset = unpack_uint64_(buffer, len);
2289
2290 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
2291 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
2292 if(read_cb(buffer, 1, len, handle) != len)
2293 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2294 track->indices[i].number = (FLAC__byte)unpack_uint32_(buffer, len);
2295
2296 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
2297 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
2298 if(read_cb(buffer, 1, len, handle) != len)
2299 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2300 }
2301
2302 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2303 }
2304
read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_CueSheet * block)2305 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block)
2306 {
2307 unsigned i, len;
2308 FLAC__Metadata_SimpleIteratorStatus status;
2309 FLAC__byte buffer[1024]; /* MSVC needs a constant expression so we put a magic number and assert */
2310
2311 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN)/8 <= sizeof(buffer));
2312 FLAC__ASSERT(sizeof(FLAC__uint64) <= sizeof(buffer));
2313
2314 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
2315 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
2316 if(read_cb(block->media_catalog_number, 1, len, handle) != len)
2317 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2318
2319 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
2320 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
2321 if(read_cb(buffer, 1, len, handle) != len)
2322 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2323 block->lead_in = unpack_uint64_(buffer, len);
2324
2325 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
2326 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
2327 if(read_cb(buffer, 1, len, handle) != len)
2328 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2329 block->is_cd = buffer[0]&0x80? true : false;
2330
2331 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
2332 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
2333 if(read_cb(buffer, 1, len, handle) != len)
2334 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2335 block->num_tracks = unpack_uint32_(buffer, len);
2336
2337 if(block->num_tracks == 0) {
2338 block->tracks = 0;
2339 }
2340 else if(0 == (block->tracks = calloc(block->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track))))
2341 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2342
2343 for(i = 0; i < block->num_tracks; i++) {
2344 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_cuesheet_track_cb_(handle, read_cb, block->tracks + i)))
2345 return status;
2346 }
2347
2348 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2349 }
2350
read_metadata_block_data_picture_cstring_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__byte ** data,FLAC__uint32 * length,FLAC__uint32 length_len)2351 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cstring_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__byte **data, FLAC__uint32 *length, FLAC__uint32 length_len)
2352 {
2353 FLAC__byte buffer[sizeof(FLAC__uint32)];
2354
2355 FLAC__ASSERT(0 != data);
2356 FLAC__ASSERT(length_len%8 == 0);
2357
2358 length_len /= 8; /* convert to bytes */
2359
2360 FLAC__ASSERT(sizeof(buffer) >= length_len);
2361
2362 if(read_cb(buffer, 1, length_len, handle) != length_len)
2363 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2364 *length = unpack_uint32_(buffer, length_len);
2365
2366 if(0 != *data)
2367 free(*data);
2368
2369 if(0 == (*data = safe_malloc_add_2op_(*length, /*+*/1)))
2370 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2371
2372 if(*length > 0) {
2373 if(read_cb(*data, 1, *length, handle) != *length)
2374 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2375 }
2376
2377 (*data)[*length] = '\0';
2378
2379 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2380 }
2381
read_metadata_block_data_picture_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_Picture * block)2382 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Picture *block)
2383 {
2384 FLAC__Metadata_SimpleIteratorStatus status;
2385 FLAC__byte buffer[4]; /* asserted below that this is big enough */
2386 FLAC__uint32 len;
2387
2388 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8);
2389 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8);
2390 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8);
2391 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8);
2392 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8);
2393
2394 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_TYPE_LEN % 8 == 0);
2395 len = FLAC__STREAM_METADATA_PICTURE_TYPE_LEN / 8;
2396 if(read_cb(buffer, 1, len, handle) != len)
2397 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2398 block->type = (FLAC__StreamMetadata_Picture_Type)unpack_uint32_(buffer, len);
2399
2400 if((status = read_metadata_block_data_picture_cstring_cb_(handle, read_cb, (FLAC__byte**)(&(block->mime_type)), &len, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN)) != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK)
2401 return status;
2402
2403 if((status = read_metadata_block_data_picture_cstring_cb_(handle, read_cb, &(block->description), &len, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN)) != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK)
2404 return status;
2405
2406 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN % 8 == 0);
2407 len = FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN / 8;
2408 if(read_cb(buffer, 1, len, handle) != len)
2409 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2410 block->width = unpack_uint32_(buffer, len);
2411
2412 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN % 8 == 0);
2413 len = FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN / 8;
2414 if(read_cb(buffer, 1, len, handle) != len)
2415 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2416 block->height = unpack_uint32_(buffer, len);
2417
2418 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN % 8 == 0);
2419 len = FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN / 8;
2420 if(read_cb(buffer, 1, len, handle) != len)
2421 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2422 block->depth = unpack_uint32_(buffer, len);
2423
2424 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_COLORS_LEN % 8 == 0);
2425 len = FLAC__STREAM_METADATA_PICTURE_COLORS_LEN / 8;
2426 if(read_cb(buffer, 1, len, handle) != len)
2427 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2428 block->colors = unpack_uint32_(buffer, len);
2429
2430 /* for convenience we use read_metadata_block_data_picture_cstring_cb_() even though it adds an extra terminating NUL we don't use */
2431 if((status = read_metadata_block_data_picture_cstring_cb_(handle, read_cb, &(block->data), &(block->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN)) != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK)
2432 return status;
2433
2434 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2435 }
2436
read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_Unknown * block,unsigned block_length)2437 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, unsigned block_length)
2438 {
2439 if(block_length == 0) {
2440 block->data = 0;
2441 }
2442 else {
2443 if(0 == (block->data = malloc(block_length)))
2444 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2445
2446 if(read_cb(block->data, 1, block_length, handle) != block_length)
2447 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2448 }
2449
2450 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2451 }
2452
write_metadata_block_header_(FILE * file,FLAC__Metadata_SimpleIteratorStatus * status,const FLAC__StreamMetadata * block)2453 FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
2454 {
2455 FLAC__ASSERT(0 != file);
2456 FLAC__ASSERT(0 != status);
2457
2458 if(!write_metadata_block_header_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) {
2459 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2460 return false;
2461 }
2462
2463 return true;
2464 }
2465
write_metadata_block_data_(FILE * file,FLAC__Metadata_SimpleIteratorStatus * status,const FLAC__StreamMetadata * block)2466 FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
2467 {
2468 FLAC__ASSERT(0 != file);
2469 FLAC__ASSERT(0 != status);
2470
2471 if (write_metadata_block_data_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) {
2472 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2473 return true;
2474 }
2475 else {
2476 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2477 return false;
2478 }
2479 }
2480
write_metadata_block_header_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata * block)2481 FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block)
2482 {
2483 FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH];
2484
2485 FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
2486
2487 buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type;
2488 pack_uint32_(block->length, buffer + 1, 3);
2489
2490 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH)
2491 return false;
2492
2493 return true;
2494 }
2495
write_metadata_block_data_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata * block)2496 FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block)
2497 {
2498 FLAC__ASSERT(0 != block);
2499
2500 switch(block->type) {
2501 case FLAC__METADATA_TYPE_STREAMINFO:
2502 return write_metadata_block_data_streaminfo_cb_(handle, write_cb, &block->data.stream_info);
2503 case FLAC__METADATA_TYPE_PADDING:
2504 return write_metadata_block_data_padding_cb_(handle, write_cb, &block->data.padding, block->length);
2505 case FLAC__METADATA_TYPE_APPLICATION:
2506 return write_metadata_block_data_application_cb_(handle, write_cb, &block->data.application, block->length);
2507 case FLAC__METADATA_TYPE_SEEKTABLE:
2508 return write_metadata_block_data_seektable_cb_(handle, write_cb, &block->data.seek_table);
2509 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
2510 return write_metadata_block_data_vorbis_comment_cb_(handle, write_cb, &block->data.vorbis_comment);
2511 case FLAC__METADATA_TYPE_CUESHEET:
2512 return write_metadata_block_data_cuesheet_cb_(handle, write_cb, &block->data.cue_sheet);
2513 case FLAC__METADATA_TYPE_PICTURE:
2514 return write_metadata_block_data_picture_cb_(handle, write_cb, &block->data.picture);
2515 default:
2516 return write_metadata_block_data_unknown_cb_(handle, write_cb, &block->data.unknown, block->length);
2517 }
2518 }
2519
write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_StreamInfo * block)2520 FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block)
2521 {
2522 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH];
2523 const unsigned channels1 = block->channels - 1;
2524 const unsigned bps1 = block->bits_per_sample - 1;
2525
2526 /* we are using hardcoded numbers for simplicity but we should
2527 * probably eventually write a bit-level packer and use the
2528 * _STREAMINFO_ constants.
2529 */
2530 pack_uint32_(block->min_blocksize, buffer, 2);
2531 pack_uint32_(block->max_blocksize, buffer+2, 2);
2532 pack_uint32_(block->min_framesize, buffer+4, 3);
2533 pack_uint32_(block->max_framesize, buffer+7, 3);
2534 buffer[10] = (block->sample_rate >> 12) & 0xff;
2535 buffer[11] = (block->sample_rate >> 4) & 0xff;
2536 buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4);
2537 buffer[13] = (FLAC__byte)(((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f));
2538 pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4);
2539 memcpy(buffer+18, block->md5sum, 16);
2540
2541 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
2542 return false;
2543
2544 return true;
2545 }
2546
write_metadata_block_data_padding_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_Padding * block,unsigned block_length)2547 FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, unsigned block_length)
2548 {
2549 unsigned i, n = block_length;
2550 FLAC__byte buffer[1024];
2551
2552 (void)block;
2553
2554 memset(buffer, 0, 1024);
2555
2556 for(i = 0; i < n/1024; i++)
2557 if(write_cb(buffer, 1, 1024, handle) != 1024)
2558 return false;
2559
2560 n %= 1024;
2561
2562 if(write_cb(buffer, 1, n, handle) != n)
2563 return false;
2564
2565 return true;
2566 }
2567
write_metadata_block_data_application_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_Application * block,unsigned block_length)2568 FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, unsigned block_length)
2569 {
2570 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
2571
2572 if(write_cb(block->id, 1, id_bytes, handle) != id_bytes)
2573 return false;
2574
2575 block_length -= id_bytes;
2576
2577 if(write_cb(block->data, 1, block_length, handle) != block_length)
2578 return false;
2579
2580 return true;
2581 }
2582
write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_SeekTable * block)2583 FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block)
2584 {
2585 unsigned i;
2586 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
2587
2588 for(i = 0; i < block->num_points; i++) {
2589 /* some MAGIC NUMBERs here */
2590 pack_uint64_(block->points[i].sample_number, buffer, 8);
2591 pack_uint64_(block->points[i].stream_offset, buffer+8, 8);
2592 pack_uint32_(block->points[i].frame_samples, buffer+16, 2);
2593 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
2594 return false;
2595 }
2596
2597 return true;
2598 }
2599
write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_VorbisComment * block)2600 FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block)
2601 {
2602 unsigned i;
2603 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
2604 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
2605 FLAC__byte buffer[4]; /* magic number is asserted below */
2606
2607 FLAC__ASSERT(MAX(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8 == sizeof(buffer));
2608
2609 pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len);
2610 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2611 return false;
2612 if(write_cb(block->vendor_string.entry, 1, block->vendor_string.length, handle) != block->vendor_string.length)
2613 return false;
2614
2615 pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len);
2616 if(write_cb(buffer, 1, num_comments_len, handle) != num_comments_len)
2617 return false;
2618
2619 for(i = 0; i < block->num_comments; i++) {
2620 pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len);
2621 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2622 return false;
2623 if(write_cb(block->comments[i].entry, 1, block->comments[i].length, handle) != block->comments[i].length)
2624 return false;
2625 }
2626
2627 return true;
2628 }
2629
write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_CueSheet * block)2630 FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block)
2631 {
2632 unsigned i, j, len;
2633 FLAC__byte buffer[1024]; /* asserted below that this is big enough */
2634
2635 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
2636 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN/8);
2637 FLAC__ASSERT(sizeof(buffer) >= (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN)/8);
2638 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
2639
2640 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
2641 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
2642 if(write_cb(block->media_catalog_number, 1, len, handle) != len)
2643 return false;
2644
2645 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
2646 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
2647 pack_uint64_(block->lead_in, buffer, len);
2648 if(write_cb(buffer, 1, len, handle) != len)
2649 return false;
2650
2651 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
2652 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
2653 memset(buffer, 0, len);
2654 if(block->is_cd)
2655 buffer[0] |= 0x80;
2656 if(write_cb(buffer, 1, len, handle) != len)
2657 return false;
2658
2659 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
2660 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
2661 pack_uint32_(block->num_tracks, buffer, len);
2662 if(write_cb(buffer, 1, len, handle) != len)
2663 return false;
2664
2665 for(i = 0; i < block->num_tracks; i++) {
2666 FLAC__StreamMetadata_CueSheet_Track *track = block->tracks + i;
2667
2668 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
2669 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
2670 pack_uint64_(track->offset, buffer, len);
2671 if(write_cb(buffer, 1, len, handle) != len)
2672 return false;
2673
2674 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
2675 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
2676 pack_uint32_(track->number, buffer, len);
2677 if(write_cb(buffer, 1, len, handle) != len)
2678 return false;
2679
2680 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
2681 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
2682 if(write_cb(track->isrc, 1, len, handle) != len)
2683 return false;
2684
2685 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) % 8 == 0);
2686 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
2687 memset(buffer, 0, len);
2688 buffer[0] = (track->type << 7) | (track->pre_emphasis << 6);
2689 if(write_cb(buffer, 1, len, handle) != len)
2690 return false;
2691
2692 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
2693 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
2694 pack_uint32_(track->num_indices, buffer, len);
2695 if(write_cb(buffer, 1, len, handle) != len)
2696 return false;
2697
2698 for(j = 0; j < track->num_indices; j++) {
2699 FLAC__StreamMetadata_CueSheet_Index *indx = track->indices + j;
2700
2701 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
2702 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
2703 pack_uint64_(indx->offset, buffer, len);
2704 if(write_cb(buffer, 1, len, handle) != len)
2705 return false;
2706
2707 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
2708 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
2709 pack_uint32_(indx->number, buffer, len);
2710 if(write_cb(buffer, 1, len, handle) != len)
2711 return false;
2712
2713 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
2714 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
2715 memset(buffer, 0, len);
2716 if(write_cb(buffer, 1, len, handle) != len)
2717 return false;
2718 }
2719 }
2720
2721 return true;
2722 }
2723
write_metadata_block_data_picture_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_Picture * block)2724 FLAC__bool write_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Picture *block)
2725 {
2726 unsigned len;
2727 size_t slen;
2728 FLAC__byte buffer[4]; /* magic number is asserted below */
2729
2730 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_TYPE_LEN%8);
2731 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN%8);
2732 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN%8);
2733 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN%8);
2734 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN%8);
2735 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN%8);
2736 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_COLORS_LEN%8);
2737 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN%8);
2738 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8);
2739 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN/8);
2740 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN/8);
2741 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8);
2742 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8);
2743 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8);
2744 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8);
2745 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN/8);
2746
2747 len = FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8;
2748 pack_uint32_(block->type, buffer, len);
2749 if(write_cb(buffer, 1, len, handle) != len)
2750 return false;
2751
2752 len = FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN/8;
2753 slen = strlen(block->mime_type);
2754 pack_uint32_(slen, buffer, len);
2755 if(write_cb(buffer, 1, len, handle) != len)
2756 return false;
2757 if(write_cb(block->mime_type, 1, slen, handle) != slen)
2758 return false;
2759
2760 len = FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN/8;
2761 slen = strlen((const char *)block->description);
2762 pack_uint32_(slen, buffer, len);
2763 if(write_cb(buffer, 1, len, handle) != len)
2764 return false;
2765 if(write_cb(block->description, 1, slen, handle) != slen)
2766 return false;
2767
2768 len = FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8;
2769 pack_uint32_(block->width, buffer, len);
2770 if(write_cb(buffer, 1, len, handle) != len)
2771 return false;
2772
2773 len = FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8;
2774 pack_uint32_(block->height, buffer, len);
2775 if(write_cb(buffer, 1, len, handle) != len)
2776 return false;
2777
2778 len = FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8;
2779 pack_uint32_(block->depth, buffer, len);
2780 if(write_cb(buffer, 1, len, handle) != len)
2781 return false;
2782
2783 len = FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8;
2784 pack_uint32_(block->colors, buffer, len);
2785 if(write_cb(buffer, 1, len, handle) != len)
2786 return false;
2787
2788 len = FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN/8;
2789 pack_uint32_(block->data_length, buffer, len);
2790 if(write_cb(buffer, 1, len, handle) != len)
2791 return false;
2792 if(write_cb(block->data, 1, block->data_length, handle) != block->data_length)
2793 return false;
2794
2795 return true;
2796 }
2797
write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_Unknown * block,unsigned block_length)2798 FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, unsigned block_length)
2799 {
2800 if(write_cb(block->data, 1, block_length, handle) != block_length)
2801 return false;
2802
2803 return true;
2804 }
2805
write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator * iterator,const FLAC__StreamMetadata * block)2806 FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block)
2807 {
2808 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2809 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2810 return false;
2811 }
2812
2813 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
2814 return false;
2815
2816 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
2817 return false;
2818
2819 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2820 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2821 return false;
2822 }
2823
2824 return read_metadata_block_header_(iterator);
2825 }
2826
write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator * iterator,FLAC__StreamMetadata * block,unsigned padding_length,FLAC__bool padding_is_last)2827 FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last)
2828 {
2829 FLAC__StreamMetadata *padding;
2830
2831 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2832 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2833 return false;
2834 }
2835
2836 block->is_last = false;
2837
2838 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
2839 return false;
2840
2841 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
2842 return false;
2843
2844 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)))
2845 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2846
2847 padding->is_last = padding_is_last;
2848 padding->length = padding_length;
2849
2850 if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) {
2851 FLAC__metadata_object_delete(padding);
2852 return false;
2853 }
2854
2855 if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) {
2856 FLAC__metadata_object_delete(padding);
2857 return false;
2858 }
2859
2860 FLAC__metadata_object_delete(padding);
2861
2862 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2863 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2864 return false;
2865 }
2866
2867 return read_metadata_block_header_(iterator);
2868 }
2869
rewrite_whole_file_(FLAC__Metadata_SimpleIterator * iterator,FLAC__StreamMetadata * block,FLAC__bool append)2870 FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append)
2871 {
2872 FILE *tempfile = NULL;
2873 char *tempfilename = NULL;
2874 int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */
2875 FLAC__off_t fixup_is_last_flag_offset = -1;
2876
2877 FLAC__ASSERT(0 != block || append == false);
2878
2879 if(iterator->is_last) {
2880 if(append) {
2881 fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */
2882 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2883 }
2884 else if(0 == block) {
2885 simple_iterator_push_(iterator);
2886 if(!FLAC__metadata_simple_iterator_prev(iterator)) {
2887 (void)simple_iterator_pop_(iterator);
2888 return false;
2889 }
2890 fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */
2891 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2892 if(!simple_iterator_pop_(iterator))
2893 return false;
2894 }
2895 }
2896
2897 if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append))
2898 return false;
2899
2900 if(0 != block) {
2901 if(!write_metadata_block_header_(tempfile, &iterator->status, block)) {
2902 cleanup_tempfile_(&tempfile, &tempfilename);
2903 return false;
2904 }
2905
2906 if(!write_metadata_block_data_(tempfile, &iterator->status, block)) {
2907 cleanup_tempfile_(&tempfile, &tempfilename);
2908 return false;
2909 }
2910 }
2911
2912 if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0))
2913 return false;
2914
2915 if(append)
2916 return FLAC__metadata_simple_iterator_next(iterator);
2917
2918 return true;
2919 }
2920
simple_iterator_push_(FLAC__Metadata_SimpleIterator * iterator)2921 void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator)
2922 {
2923 FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH);
2924 iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth];
2925 iterator->depth++;
2926 }
2927
simple_iterator_pop_(FLAC__Metadata_SimpleIterator * iterator)2928 FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator)
2929 {
2930 FLAC__ASSERT(iterator->depth > 0);
2931 iterator->depth--;
2932 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2933 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2934 return false;
2935 }
2936
2937 return read_metadata_block_header_(iterator);
2938 }
2939
2940 /* return meanings:
2941 * 0: ok
2942 * 1: read error
2943 * 2: seek error
2944 * 3: not a FLAC file
2945 */
seek_to_first_metadata_block_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__IOCallback_Seek seek_cb)2946 unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb)
2947 {
2948 FLAC__byte buffer[4];
2949 size_t n;
2950 unsigned i;
2951
2952 FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == sizeof(buffer));
2953
2954 /* skip any id3v2 tag */
2955 errno = 0;
2956 n = read_cb(buffer, 1, 4, handle);
2957 if(errno)
2958 return 1;
2959 else if(n != 4)
2960 return 3;
2961 else if(0 == memcmp(buffer, "ID3", 3)) {
2962 unsigned tag_length = 0;
2963
2964 /* skip to the tag length */
2965 if(seek_cb(handle, 2, SEEK_CUR) < 0)
2966 return 2;
2967
2968 /* read the length */
2969 for(i = 0; i < 4; i++) {
2970 if(read_cb(buffer, 1, 1, handle) < 1 || buffer[0] & 0x80)
2971 return 1;
2972 tag_length <<= 7;
2973 tag_length |= (buffer[0] & 0x7f);
2974 }
2975
2976 /* skip the rest of the tag */
2977 if(seek_cb(handle, tag_length, SEEK_CUR) < 0)
2978 return 2;
2979
2980 /* read the stream sync code */
2981 errno = 0;
2982 n = read_cb(buffer, 1, 4, handle);
2983 if(errno)
2984 return 1;
2985 else if(n != 4)
2986 return 3;
2987 }
2988
2989 /* check for the fLaC signature */
2990 if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH))
2991 return 0;
2992 else
2993 return 3;
2994 }
2995
seek_to_first_metadata_block_(FILE * f)2996 unsigned seek_to_first_metadata_block_(FILE *f)
2997 {
2998 return seek_to_first_metadata_block_cb_((FLAC__IOHandle)f, (FLAC__IOCallback_Read)fread, fseek_wrapper_);
2999 }
3000
simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator * iterator,FILE ** tempfile,char ** tempfilename,FLAC__bool append)3001 FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append)
3002 {
3003 const FLAC__off_t offset_end = append? iterator->offset[iterator->depth] + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length : iterator->offset[iterator->depth];
3004
3005 if(0 != fseeko(iterator->file, 0, SEEK_SET)) {
3006 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
3007 return false;
3008 }
3009 if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) {
3010 cleanup_tempfile_(tempfile, tempfilename);
3011 return false;
3012 }
3013 if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) {
3014 cleanup_tempfile_(tempfile, tempfilename);
3015 return false;
3016 }
3017
3018 return true;
3019 }
3020
simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator * iterator,FILE ** tempfile,char ** tempfilename,int fixup_is_last_code,FLAC__off_t fixup_is_last_flag_offset,FLAC__bool backup)3021 FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, FLAC__off_t fixup_is_last_flag_offset, FLAC__bool backup)
3022 {
3023 FLAC__off_t save_offset = iterator->offset[iterator->depth];
3024 FLAC__ASSERT(0 != *tempfile);
3025
3026 if(0 != fseeko(iterator->file, save_offset + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length, SEEK_SET)) {
3027 cleanup_tempfile_(tempfile, tempfilename);
3028 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
3029 return false;
3030 }
3031 if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) {
3032 cleanup_tempfile_(tempfile, tempfilename);
3033 return false;
3034 }
3035
3036 if(fixup_is_last_code != 0) {
3037 /*
3038 * if code == 1, it means a block was appended to the end so
3039 * we have to clear the is_last flag of the previous block
3040 * if code == -1, it means the last block was deleted so
3041 * we have to set the is_last flag of the previous block
3042 */
3043 /* MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */
3044 FLAC__byte x;
3045 if(0 != fseeko(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
3046 cleanup_tempfile_(tempfile, tempfilename);
3047 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
3048 return false;
3049 }
3050 if(fread(&x, 1, 1, *tempfile) != 1) {
3051 cleanup_tempfile_(tempfile, tempfilename);
3052 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3053 return false;
3054 }
3055 if(fixup_is_last_code > 0) {
3056 FLAC__ASSERT(x & 0x80);
3057 x &= 0x7f;
3058 }
3059 else {
3060 FLAC__ASSERT(!(x & 0x80));
3061 x |= 0x80;
3062 }
3063 if(0 != fseeko(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
3064 cleanup_tempfile_(tempfile, tempfilename);
3065 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
3066 return false;
3067 }
3068 if(local__fwrite(&x, 1, 1, *tempfile) != 1) {
3069 cleanup_tempfile_(tempfile, tempfilename);
3070 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3071 return false;
3072 }
3073 }
3074
3075 (void)fclose(iterator->file);
3076
3077 if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status))
3078 return false;
3079
3080 if(iterator->has_stats)
3081 set_file_stats_(iterator->filename, &iterator->stats);
3082
3083 if(!simple_iterator_prime_input_(iterator, !iterator->is_writable))
3084 return false;
3085 if(backup) {
3086 while(iterator->offset[iterator->depth] + (FLAC__off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (FLAC__off_t)iterator->length < save_offset)
3087 if(!FLAC__metadata_simple_iterator_next(iterator))
3088 return false;
3089 return true;
3090 }
3091 else {
3092 /* move the iterator to it's original block faster by faking a push, then doing a pop_ */
3093 FLAC__ASSERT(iterator->depth == 0);
3094 iterator->offset[0] = save_offset;
3095 iterator->depth++;
3096 return simple_iterator_pop_(iterator);
3097 }
3098 }
3099
copy_n_bytes_from_file_(FILE * file,FILE * tempfile,FLAC__off_t bytes,FLAC__Metadata_SimpleIteratorStatus * status)3100 FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status)
3101 {
3102 FLAC__byte buffer[8192];
3103 size_t n;
3104
3105 FLAC__ASSERT(bytes >= 0);
3106 while(bytes > 0) {
3107 n = MIN(sizeof(buffer), (size_t)bytes);
3108 if(fread(buffer, 1, n, file) != n) {
3109 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3110 return false;
3111 }
3112 if(local__fwrite(buffer, 1, n, tempfile) != n) {
3113 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3114 return false;
3115 }
3116 bytes -= n;
3117 }
3118
3119 return true;
3120 }
3121
copy_n_bytes_from_file_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__IOHandle temp_handle,FLAC__IOCallback_Write temp_write_cb,FLAC__off_t bytes,FLAC__Metadata_SimpleIteratorStatus * status)3122 FLAC__bool copy_n_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status)
3123 {
3124 FLAC__byte buffer[8192];
3125 size_t n;
3126
3127 FLAC__ASSERT(bytes >= 0);
3128 while(bytes > 0) {
3129 n = MIN(sizeof(buffer), (size_t)bytes);
3130 if(read_cb(buffer, 1, n, handle) != n) {
3131 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3132 return false;
3133 }
3134 if(temp_write_cb(buffer, 1, n, temp_handle) != n) {
3135 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3136 return false;
3137 }
3138 bytes -= n;
3139 }
3140
3141 return true;
3142 }
3143
copy_remaining_bytes_from_file_(FILE * file,FILE * tempfile,FLAC__Metadata_SimpleIteratorStatus * status)3144 FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status)
3145 {
3146 FLAC__byte buffer[8192];
3147 size_t n;
3148
3149 while(!feof(file)) {
3150 n = fread(buffer, 1, sizeof(buffer), file);
3151 if(n == 0 && !feof(file)) {
3152 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3153 return false;
3154 }
3155 if(n > 0 && local__fwrite(buffer, 1, n, tempfile) != n) {
3156 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3157 return false;
3158 }
3159 }
3160
3161 return true;
3162 }
3163
copy_remaining_bytes_from_file_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__IOCallback_Eof eof_cb,FLAC__IOHandle temp_handle,FLAC__IOCallback_Write temp_write_cb,FLAC__Metadata_SimpleIteratorStatus * status)3164 FLAC__bool copy_remaining_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Eof eof_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__Metadata_SimpleIteratorStatus *status)
3165 {
3166 FLAC__byte buffer[8192];
3167 size_t n;
3168
3169 while(!eof_cb(handle)) {
3170 n = read_cb(buffer, 1, sizeof(buffer), handle);
3171 if(n == 0 && !eof_cb(handle)) {
3172 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3173 return false;
3174 }
3175 if(n > 0 && temp_write_cb(buffer, 1, n, temp_handle) != n) {
3176 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3177 return false;
3178 }
3179 }
3180
3181 return true;
3182 }
3183
3184 static int
local_snprintf(char * str,size_t size,const char * fmt,...)3185 local_snprintf(char *str, size_t size, const char *fmt, ...)
3186 {
3187 va_list va;
3188 int rc ;
3189
3190 va_start (va, fmt);
3191
3192 #ifdef _MSC_VER
3193 rc = vsnprintf_s (str, size, _TRUNCATE, fmt, va);
3194 rc = (rc > 0) ? rc : (size == 0 ? 1024 : size * 2);
3195 #else
3196 rc = vsnprintf (str, size, fmt, va);
3197 #endif
3198 va_end (va);
3199
3200 return rc;
3201 }
3202
open_tempfile_(const char * filename,const char * tempfile_path_prefix,FILE ** tempfile,char ** tempfilename,FLAC__Metadata_SimpleIteratorStatus * status)3203 FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
3204 {
3205 static const char *tempfile_suffix = ".metadata_edit";
3206 if(0 == tempfile_path_prefix) {
3207 size_t dest_len = strlen(filename) + strlen(tempfile_suffix) + 1;
3208 if(0 == (*tempfilename = safe_malloc_(dest_len))) {
3209 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
3210 return false;
3211 }
3212 local_snprintf(*tempfilename, dest_len, "%s%s", filename, tempfile_suffix);
3213 }
3214 else {
3215 const char *p = strrchr(filename, '/');
3216 size_t dest_len;
3217 if(0 == p)
3218 p = filename;
3219 else
3220 p++;
3221
3222 dest_len = strlen(tempfile_path_prefix) + strlen(p) + strlen(tempfile_suffix) + 2;
3223
3224 if(0 == (*tempfilename = safe_malloc_(dest_len))) {
3225 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
3226 return false;
3227 }
3228 local_snprintf(*tempfilename, dest_len, "%s/%s%s", tempfile_path_prefix, p, tempfile_suffix);
3229 }
3230
3231 if(0 == (*tempfile = flac_fopen(*tempfilename, "w+b"))) {
3232 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
3233 return false;
3234 }
3235
3236 return true;
3237 }
3238
transport_tempfile_(const char * filename,FILE ** tempfile,char ** tempfilename,FLAC__Metadata_SimpleIteratorStatus * status)3239 FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
3240 {
3241 FLAC__ASSERT(0 != filename);
3242 FLAC__ASSERT(0 != tempfile);
3243 FLAC__ASSERT(0 != *tempfile);
3244 FLAC__ASSERT(0 != tempfilename);
3245 FLAC__ASSERT(0 != *tempfilename);
3246 FLAC__ASSERT(0 != status);
3247
3248 (void)fclose(*tempfile);
3249 *tempfile = 0;
3250
3251 #if defined _MSC_VER || defined __BORLANDC__ || defined __MINGW32__ || defined __EMX__
3252 /* on some flavors of windows, flac_rename() will fail if the destination already exists */
3253 if(flac_unlink(filename) < 0) {
3254 cleanup_tempfile_(tempfile, tempfilename);
3255 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR;
3256 return false;
3257 }
3258 #endif
3259
3260 /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just flac_rename(): */
3261 if(0 != flac_rename(*tempfilename, filename)) {
3262 cleanup_tempfile_(tempfile, tempfilename);
3263 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR;
3264 return false;
3265 }
3266
3267 cleanup_tempfile_(tempfile, tempfilename);
3268
3269 return true;
3270 }
3271
cleanup_tempfile_(FILE ** tempfile,char ** tempfilename)3272 void cleanup_tempfile_(FILE **tempfile, char **tempfilename)
3273 {
3274 if(0 != *tempfile) {
3275 (void)fclose(*tempfile);
3276 *tempfile = 0;
3277 }
3278
3279 if(0 != *tempfilename) {
3280 (void)flac_unlink(*tempfilename);
3281 free(*tempfilename);
3282 *tempfilename = 0;
3283 }
3284 }
3285
get_file_stats_(const char * filename,struct flac_stat_s * stats)3286 FLAC__bool get_file_stats_(const char *filename, struct flac_stat_s *stats)
3287 {
3288 FLAC__ASSERT(0 != filename);
3289 FLAC__ASSERT(0 != stats);
3290 return (0 == flac_stat(filename, stats));
3291 }
3292
set_file_stats_(const char * filename,struct flac_stat_s * stats)3293 void set_file_stats_(const char *filename, struct flac_stat_s *stats)
3294 {
3295 struct utimbuf srctime;
3296
3297 FLAC__ASSERT(0 != filename);
3298 FLAC__ASSERT(0 != stats);
3299
3300 srctime.actime = stats->st_atime;
3301 srctime.modtime = stats->st_mtime;
3302 (void)flac_chmod(filename, stats->st_mode);
3303 (void)flac_utime(filename, &srctime);
3304 #if !defined _MSC_VER && !defined __BORLANDC__ && !defined __MINGW32__
3305 FLAC_CHECK_RETURN(chown(filename, stats->st_uid, -1));
3306 FLAC_CHECK_RETURN(chown(filename, -1, stats->st_gid));
3307 #endif
3308 }
3309
fseek_wrapper_(FLAC__IOHandle handle,FLAC__int64 offset,int whence)3310 int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence)
3311 {
3312 return fseeko((FILE*)handle, (FLAC__off_t)offset, whence);
3313 }
3314
ftell_wrapper_(FLAC__IOHandle handle)3315 FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle)
3316 {
3317 return ftello((FILE*)handle);
3318 }
3319
get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status)3320 FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status)
3321 {
3322 switch(status) {
3323 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK:
3324 return FLAC__METADATA_CHAIN_STATUS_OK;
3325 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT:
3326 return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT;
3327 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE:
3328 return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
3329 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE:
3330 return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
3331 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE:
3332 return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE;
3333 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA:
3334 return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA;
3335 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR:
3336 return FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
3337 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR:
3338 return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
3339 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR:
3340 return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
3341 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR:
3342 return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR;
3343 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR:
3344 return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR;
3345 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR:
3346 return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
3347 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR:
3348 default:
3349 return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;
3350 }
3351 }
3352