1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2001,2002,2003,2004,2005,2006,2007 Josh Coalson
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * - Neither the name of the Xiph.org Foundation nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #if HAVE_CONFIG_H
33 # include <config.h>
34 #endif
35
36 #include <errno.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40
41 #if defined _MSC_VER || defined __BORLANDC__ || defined __MINGW32__
42 #if defined __BORLANDC__
43 #include <utime.h> /* for utime() */
44 #else
45 #include <sys/utime.h> /* for utime() */
46 #endif
47 #include <io.h> /* for chmod() */
48 #include <sys/types.h> /* for off_t */
49 #if _MSC_VER <= 1600 || defined __BORLANDC__ /* @@@ [2G limit] */
50 #define fseeko fseek
51 #define ftello ftell
52 #endif
53 #else
54 #include <sys/types.h> /* some flavors of BSD (like OS X) require this to get time_t */
55 #include <utime.h> /* for utime() */
56 #include <unistd.h> /* for chown(), unlink() */
57 #endif
58 #include <sys/stat.h> /* for stat(), maybe chmod() */
59
60 #include "private/metadata.h"
61
62 #include "FLAC/assert.h"
63 #include "FLAC/stream_decoder.h"
64 #include "share/alloc.h"
65
66 #ifdef max
67 #undef max
68 #endif
69 #define max(a,b) ((a)>(b)?(a):(b))
70 #ifdef min
71 #undef min
72 #endif
73 #define min(a,b) ((a)<(b)?(a):(b))
74
75
76 /****************************************************************************
77 *
78 * Local function declarations
79 *
80 ***************************************************************************/
81
82 static void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
83 static void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
84 static void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes);
85 static FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes);
86 static FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes);
87 static FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes);
88
89 static FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator);
90 static FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block);
91 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);
92 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);
93 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block);
94 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);
95 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);
96 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);
97 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);
98 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment *block);
99 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track);
100 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block);
101 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Picture *block);
102 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);
103
104 static FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
105 static FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
106 static FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block);
107 static FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block);
108 static FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block);
109 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);
110 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);
111 static FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block);
112 static FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block);
113 static FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block);
114 static FLAC__bool write_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Picture *block);
115 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);
116
117 static FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block);
118 static FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last);
119 static FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append);
120
121 static void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator);
122 static FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator);
123
124 static unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb);
125 static unsigned seek_to_first_metadata_block_(FILE *f);
126
127 static FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append);
128 static FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, off_t fixup_is_last_flag_offset, FLAC__bool backup);
129
130 static FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status);
131 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, off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status);
132 static FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status);
133 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);
134
135 static FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
136 static FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
137 static void cleanup_tempfile_(FILE **tempfile, char **tempfilename);
138
139 static FLAC__bool get_file_stats_(const char *filename, struct stat *stats);
140 static void set_file_stats_(const char *filename, struct stat *stats);
141
142 static int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence);
143 static FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle);
144
145 static FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status);
146
147
148 #ifdef FLAC__VALGRIND_TESTING
local__fwrite(const void * ptr,size_t size,size_t nmemb,FILE * stream)149 static size_t local__fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
150 {
151 size_t ret = fwrite(ptr, size, nmemb, stream);
152 if(!ferror(stream))
153 fflush(stream);
154 return ret;
155 }
156 #else
157 #define local__fwrite fwrite
158 #endif
159
160 /****************************************************************************
161 *
162 * Level 0 implementation
163 *
164 ***************************************************************************/
165
166 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
167 static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
168 static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
169
170 typedef struct {
171 FLAC__bool got_error;
172 FLAC__StreamMetadata *object;
173 } level0_client_data;
174
get_one_metadata_block_(const char * filename,FLAC__MetadataType type)175 static FLAC__StreamMetadata *get_one_metadata_block_(const char *filename, FLAC__MetadataType type)
176 {
177 level0_client_data cd;
178 FLAC__StreamDecoder *decoder;
179
180 FLAC__ASSERT(0 != filename);
181
182 cd.got_error = false;
183 cd.object = 0;
184
185 decoder = FLAC__stream_decoder_new();
186
187 if(0 == decoder)
188 return 0;
189
190 FLAC__stream_decoder_set_md5_checking(decoder, false);
191 FLAC__stream_decoder_set_metadata_ignore_all(decoder);
192 FLAC__stream_decoder_set_metadata_respond(decoder, type);
193
194 if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, metadata_callback_, error_callback_, &cd) != FLAC__STREAM_DECODER_INIT_STATUS_OK || cd.got_error) {
195 (void)FLAC__stream_decoder_finish(decoder);
196 FLAC__stream_decoder_delete(decoder);
197 return 0;
198 }
199
200 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder) || cd.got_error) {
201 (void)FLAC__stream_decoder_finish(decoder);
202 FLAC__stream_decoder_delete(decoder);
203 if(0 != cd.object)
204 FLAC__metadata_object_delete(cd.object);
205 return 0;
206 }
207
208 (void)FLAC__stream_decoder_finish(decoder);
209 FLAC__stream_decoder_delete(decoder);
210
211 return cd.object;
212 }
213
FLAC__metadata_get_streaminfo(const char * filename,FLAC__StreamMetadata * streaminfo)214 FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo)
215 {
216 FLAC__StreamMetadata *object;
217
218 FLAC__ASSERT(0 != filename);
219 FLAC__ASSERT(0 != streaminfo);
220
221 object = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_STREAMINFO);
222
223 if (object) {
224 /* can just copy the contents since STREAMINFO has no internal structure */
225 *streaminfo = *object;
226 FLAC__metadata_object_delete(object);
227 return true;
228 }
229 else {
230 return false;
231 }
232 }
233
FLAC__metadata_get_tags(const char * filename,FLAC__StreamMetadata ** tags)234 FLAC_API FLAC__bool FLAC__metadata_get_tags(const char *filename, FLAC__StreamMetadata **tags)
235 {
236 FLAC__ASSERT(0 != filename);
237 FLAC__ASSERT(0 != tags);
238
239 *tags = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_VORBIS_COMMENT);
240
241 return 0 != *tags;
242 }
243
FLAC__metadata_get_cuesheet(const char * filename,FLAC__StreamMetadata ** cuesheet)244 FLAC_API FLAC__bool FLAC__metadata_get_cuesheet(const char *filename, FLAC__StreamMetadata **cuesheet)
245 {
246 FLAC__ASSERT(0 != filename);
247 FLAC__ASSERT(0 != cuesheet);
248
249 *cuesheet = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_CUESHEET);
250
251 return 0 != *cuesheet;
252 }
253
write_callback_(const FLAC__StreamDecoder * decoder,const FLAC__Frame * frame,const FLAC__int32 * const buffer[],void * client_data)254 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
255 {
256 (void)decoder, (void)frame, (void)buffer, (void)client_data;
257
258 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
259 }
260
metadata_callback_(const FLAC__StreamDecoder * decoder,const FLAC__StreamMetadata * metadata,void * client_data)261 void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
262 {
263 level0_client_data *cd = (level0_client_data *)client_data;
264 (void)decoder;
265
266 /*
267 * we assume we only get here when the one metadata block we were
268 * looking for was passed to us
269 */
270 if(!cd->got_error && 0 == cd->object) {
271 if(0 == (cd->object = FLAC__metadata_object_clone(metadata)))
272 cd->got_error = true;
273 }
274 }
275
error_callback_(const FLAC__StreamDecoder * decoder,FLAC__StreamDecoderErrorStatus status,void * client_data)276 void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
277 {
278 level0_client_data *cd = (level0_client_data *)client_data;
279 (void)decoder;
280
281 if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
282 cd->got_error = true;
283 }
284
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)285 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)
286 {
287 FLAC__Metadata_SimpleIterator *it;
288 FLAC__uint64 max_area_seen = 0;
289 FLAC__uint64 max_depth_seen = 0;
290
291 FLAC__ASSERT(0 != filename);
292 FLAC__ASSERT(0 != picture);
293
294 *picture = 0;
295
296 it = FLAC__metadata_simple_iterator_new();
297 if(0 == it)
298 return false;
299 if(!FLAC__metadata_simple_iterator_init(it, filename, /*read_only=*/true, /*preserve_file_stats=*/true)) {
300 FLAC__metadata_simple_iterator_delete(it);
301 return false;
302 }
303 do {
304 if(FLAC__metadata_simple_iterator_get_block_type(it) == FLAC__METADATA_TYPE_PICTURE) {
305 FLAC__StreamMetadata *obj = FLAC__metadata_simple_iterator_get_block(it);
306 FLAC__uint64 area = (FLAC__uint64)obj->data.picture.width * (FLAC__uint64)obj->data.picture.height;
307 /* check constraints */
308 if(
309 (type == (FLAC__StreamMetadata_Picture_Type)(-1) || type == obj->data.picture.type) &&
310 (mime_type == 0 || !strcmp(mime_type, obj->data.picture.mime_type)) &&
311 (description == 0 || !strcmp((const char *)description, (const char *)obj->data.picture.description)) &&
312 obj->data.picture.width <= max_width &&
313 obj->data.picture.height <= max_height &&
314 obj->data.picture.depth <= max_depth &&
315 obj->data.picture.colors <= max_colors &&
316 (area > max_area_seen || (area == max_area_seen && obj->data.picture.depth > max_depth_seen))
317 ) {
318 if(*picture)
319 FLAC__metadata_object_delete(*picture);
320 *picture = obj;
321 max_area_seen = area;
322 max_depth_seen = obj->data.picture.depth;
323 }
324 else {
325 FLAC__metadata_object_delete(obj);
326 }
327 }
328 } while(FLAC__metadata_simple_iterator_next(it));
329
330 FLAC__metadata_simple_iterator_delete(it);
331
332 return (0 != *picture);
333 }
334
335
336 /****************************************************************************
337 *
338 * Level 1 implementation
339 *
340 ***************************************************************************/
341
342 #define SIMPLE_ITERATOR_MAX_PUSH_DEPTH (1+4)
343 /* 1 for initial offset, +4 for our own personal use */
344
345 struct FLAC__Metadata_SimpleIterator {
346 FILE *file;
347 char *filename, *tempfile_path_prefix;
348 struct stat stats;
349 FLAC__bool has_stats;
350 FLAC__bool is_writable;
351 FLAC__Metadata_SimpleIteratorStatus status;
352 off_t offset[SIMPLE_ITERATOR_MAX_PUSH_DEPTH];
353 off_t first_offset; /* this is the offset to the STREAMINFO block */
354 unsigned depth;
355 /* this is the metadata block header of the current block we are pointing to: */
356 FLAC__bool is_last;
357 FLAC__MetadataType type;
358 unsigned length;
359 };
360
361 FLAC_API const char * const FLAC__Metadata_SimpleIteratorStatusString[] = {
362 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK",
363 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT",
364 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE",
365 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE",
366 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE",
367 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA",
368 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR",
369 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR",
370 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR",
371 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR",
372 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR",
373 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR",
374 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR"
375 };
376
377
FLAC__metadata_simple_iterator_new(void)378 FLAC_API FLAC__Metadata_SimpleIterator *FLAC__metadata_simple_iterator_new(void)
379 {
380 FLAC__Metadata_SimpleIterator *iterator = (FLAC__Metadata_SimpleIterator*)calloc(1, sizeof(FLAC__Metadata_SimpleIterator));
381
382 if(0 != iterator) {
383 iterator->file = 0;
384 iterator->filename = 0;
385 iterator->tempfile_path_prefix = 0;
386 iterator->has_stats = false;
387 iterator->is_writable = false;
388 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
389 iterator->first_offset = iterator->offset[0] = -1;
390 iterator->depth = 0;
391 }
392
393 return iterator;
394 }
395
simple_iterator_free_guts_(FLAC__Metadata_SimpleIterator * iterator)396 static void simple_iterator_free_guts_(FLAC__Metadata_SimpleIterator *iterator)
397 {
398 FLAC__ASSERT(0 != iterator);
399
400 if(0 != iterator->file) {
401 fclose(iterator->file);
402 iterator->file = 0;
403 if(iterator->has_stats)
404 set_file_stats_(iterator->filename, &iterator->stats);
405 }
406 if(0 != iterator->filename) {
407 free(iterator->filename);
408 iterator->filename = 0;
409 }
410 if(0 != iterator->tempfile_path_prefix) {
411 free(iterator->tempfile_path_prefix);
412 iterator->tempfile_path_prefix = 0;
413 }
414 }
415
FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator * iterator)416 FLAC_API void FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator *iterator)
417 {
418 FLAC__ASSERT(0 != iterator);
419
420 simple_iterator_free_guts_(iterator);
421 free(iterator);
422 }
423
FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator * iterator)424 FLAC_API FLAC__Metadata_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator *iterator)
425 {
426 FLAC__Metadata_SimpleIteratorStatus status;
427
428 FLAC__ASSERT(0 != iterator);
429
430 status = iterator->status;
431 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
432 return status;
433 }
434
simple_iterator_prime_input_(FLAC__Metadata_SimpleIterator * iterator,FLAC__bool read_only)435 static FLAC__bool simple_iterator_prime_input_(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool read_only)
436 {
437 unsigned ret;
438
439 FLAC__ASSERT(0 != iterator);
440
441 if(read_only || 0 == (iterator->file = fopen(iterator->filename, "r+b"))) {
442 iterator->is_writable = false;
443 if(read_only || errno == EACCES) {
444 if(0 == (iterator->file = fopen(iterator->filename, "rb"))) {
445 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
446 return false;
447 }
448 }
449 else {
450 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
451 return false;
452 }
453 }
454 else {
455 iterator->is_writable = true;
456 }
457
458 ret = seek_to_first_metadata_block_(iterator->file);
459 switch(ret) {
460 case 0:
461 iterator->depth = 0;
462 iterator->first_offset = iterator->offset[iterator->depth] = ftello(iterator->file);
463 return read_metadata_block_header_(iterator);
464 case 1:
465 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
466 return false;
467 case 2:
468 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
469 return false;
470 case 3:
471 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE;
472 return false;
473 default:
474 FLAC__ASSERT(0);
475 return false;
476 }
477 }
478
479 #if 0
480 @@@ If we decide to finish implementing this, put this comment back in metadata.h
481 /*
482 * The 'tempfile_path_prefix' allows you to specify a directory where
483 * tempfiles should go. Remember that if your metadata edits cause the
484 * FLAC file to grow, the entire file will have to be rewritten. If
485 * 'tempfile_path_prefix' is NULL, the temp file will be written in the
486 * same directory as the original FLAC file. This makes replacing the
487 * original with the tempfile fast but requires extra space in the same
488 * partition for the tempfile. If space is a problem, you can pass a
489 * directory name belonging to a different partition in
490 * 'tempfile_path_prefix'. Note that you should use the forward slash
491 * '/' as the directory separator. A trailing slash is not needed; it
492 * will be added automatically.
493 */
494 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats, const char *tempfile_path_prefix);
495 #endif
496
FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator * iterator,const char * filename,FLAC__bool read_only,FLAC__bool preserve_file_stats)497 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)
498 {
499 const char *tempfile_path_prefix = 0; /*@@@ search for comments near 'rename(...)' for what it will take to finish implementing this */
500
501 FLAC__ASSERT(0 != iterator);
502 FLAC__ASSERT(0 != filename);
503
504 simple_iterator_free_guts_(iterator);
505
506 if(!read_only && preserve_file_stats)
507 iterator->has_stats = get_file_stats_(filename, &iterator->stats);
508
509 if(0 == (iterator->filename = strdup(filename))) {
510 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
511 return false;
512 }
513 if(0 != tempfile_path_prefix && 0 == (iterator->tempfile_path_prefix = strdup(tempfile_path_prefix))) {
514 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
515 return false;
516 }
517
518 return simple_iterator_prime_input_(iterator, read_only);
519 }
520
FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator * iterator)521 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator *iterator)
522 {
523 FLAC__ASSERT(0 != iterator);
524 FLAC__ASSERT(0 != iterator->file);
525
526 return iterator->is_writable;
527 }
528
FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator * iterator)529 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator *iterator)
530 {
531 FLAC__ASSERT(0 != iterator);
532 FLAC__ASSERT(0 != iterator->file);
533
534 if(iterator->is_last)
535 return false;
536
537 if(0 != fseeko(iterator->file, iterator->length, SEEK_CUR)) {
538 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
539 return false;
540 }
541
542 iterator->offset[iterator->depth] = ftello(iterator->file);
543
544 return read_metadata_block_header_(iterator);
545 }
546
FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator * iterator)547 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator *iterator)
548 {
549 off_t this_offset;
550
551 FLAC__ASSERT(0 != iterator);
552 FLAC__ASSERT(0 != iterator->file);
553
554 if(iterator->offset[iterator->depth] == iterator->first_offset)
555 return false;
556
557 if(0 != fseeko(iterator->file, iterator->first_offset, SEEK_SET)) {
558 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
559 return false;
560 }
561 this_offset = iterator->first_offset;
562 if(!read_metadata_block_header_(iterator))
563 return false;
564
565 /* we ignore any error from ftello() and catch it in fseeko() */
566 while(ftello(iterator->file) + (off_t)iterator->length < iterator->offset[iterator->depth]) {
567 if(0 != fseeko(iterator->file, iterator->length, SEEK_CUR)) {
568 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
569 return false;
570 }
571 this_offset = ftello(iterator->file);
572 if(!read_metadata_block_header_(iterator))
573 return false;
574 }
575
576 iterator->offset[iterator->depth] = this_offset;
577
578 return true;
579 }
580
581 /*@@@@add to tests*/
FLAC__metadata_simple_iterator_is_last(const FLAC__Metadata_SimpleIterator * iterator)582 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_last(const FLAC__Metadata_SimpleIterator *iterator)
583 {
584 FLAC__ASSERT(0 != iterator);
585 FLAC__ASSERT(0 != iterator->file);
586
587 return iterator->is_last;
588 }
589
590 /*@@@@add to tests*/
FLAC__metadata_simple_iterator_get_block_offset(const FLAC__Metadata_SimpleIterator * iterator)591 FLAC_API off_t FLAC__metadata_simple_iterator_get_block_offset(const FLAC__Metadata_SimpleIterator *iterator)
592 {
593 FLAC__ASSERT(0 != iterator);
594 FLAC__ASSERT(0 != iterator->file);
595
596 return iterator->offset[iterator->depth];
597 }
598
FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator * iterator)599 FLAC_API FLAC__MetadataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator *iterator)
600 {
601 FLAC__ASSERT(0 != iterator);
602 FLAC__ASSERT(0 != iterator->file);
603
604 return iterator->type;
605 }
606
607 /*@@@@add to tests*/
FLAC__metadata_simple_iterator_get_block_length(const FLAC__Metadata_SimpleIterator * iterator)608 FLAC_API unsigned FLAC__metadata_simple_iterator_get_block_length(const FLAC__Metadata_SimpleIterator *iterator)
609 {
610 FLAC__ASSERT(0 != iterator);
611 FLAC__ASSERT(0 != iterator->file);
612
613 return iterator->length;
614 }
615
616 /*@@@@add to tests*/
FLAC__metadata_simple_iterator_get_application_id(FLAC__Metadata_SimpleIterator * iterator,FLAC__byte * id)617 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_get_application_id(FLAC__Metadata_SimpleIterator *iterator, FLAC__byte *id)
618 {
619 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
620
621 FLAC__ASSERT(0 != iterator);
622 FLAC__ASSERT(0 != iterator->file);
623 FLAC__ASSERT(0 != id);
624
625 if(iterator->type != FLAC__METADATA_TYPE_APPLICATION) {
626 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
627 return false;
628 }
629
630 if(fread(id, 1, id_bytes, iterator->file) != id_bytes) {
631 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
632 return false;
633 }
634
635 /* back up */
636 if(0 != fseeko(iterator->file, -((int)id_bytes), SEEK_CUR)) {
637 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
638 return false;
639 }
640
641 return true;
642 }
643
FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator * iterator)644 FLAC_API FLAC__StreamMetadata *FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator *iterator)
645 {
646 FLAC__StreamMetadata *block = FLAC__metadata_object_new(iterator->type);
647
648 FLAC__ASSERT(0 != iterator);
649 FLAC__ASSERT(0 != iterator->file);
650
651 if(0 != block) {
652 block->is_last = iterator->is_last;
653 block->length = iterator->length;
654
655 if(!read_metadata_block_data_(iterator, block)) {
656 FLAC__metadata_object_delete(block);
657 return 0;
658 }
659
660 /* back up to the beginning of the block data to stay consistent */
661 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH, SEEK_SET)) {
662 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
663 FLAC__metadata_object_delete(block);
664 return 0;
665 }
666 }
667 else
668 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
669
670 return block;
671 }
672
FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator * iterator,FLAC__StreamMetadata * block,FLAC__bool use_padding)673 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
674 {
675 FLAC__ASSERT_DECLARATION(off_t debug_target_offset = iterator->offset[iterator->depth];)
676 FLAC__bool ret;
677
678 FLAC__ASSERT(0 != iterator);
679 FLAC__ASSERT(0 != iterator->file);
680 FLAC__ASSERT(0 != block);
681
682 if(!iterator->is_writable) {
683 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE;
684 return false;
685 }
686
687 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO || block->type == FLAC__METADATA_TYPE_STREAMINFO) {
688 if(iterator->type != block->type) {
689 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
690 return false;
691 }
692 }
693
694 block->is_last = iterator->is_last;
695
696 if(iterator->length == block->length)
697 return write_metadata_block_stationary_(iterator, block);
698 else if(iterator->length > block->length) {
699 if(use_padding && iterator->length >= FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) {
700 ret = write_metadata_block_stationary_with_padding_(iterator, block, iterator->length - FLAC__STREAM_METADATA_HEADER_LENGTH - block->length, block->is_last);
701 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
702 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
703 return ret;
704 }
705 else {
706 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
707 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
708 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
709 return ret;
710 }
711 }
712 else /* iterator->length < block->length */ {
713 unsigned padding_leftover = 0;
714 FLAC__bool padding_is_last = false;
715 if(use_padding) {
716 /* first see if we can even use padding */
717 if(iterator->is_last) {
718 use_padding = false;
719 }
720 else {
721 const unsigned extra_padding_bytes_required = block->length - iterator->length;
722 simple_iterator_push_(iterator);
723 if(!FLAC__metadata_simple_iterator_next(iterator)) {
724 (void)simple_iterator_pop_(iterator);
725 return false;
726 }
727 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
728 use_padding = false;
729 }
730 else {
731 if(FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length == extra_padding_bytes_required) {
732 padding_leftover = 0;
733 block->is_last = iterator->is_last;
734 }
735 else if(iterator->length < extra_padding_bytes_required)
736 use_padding = false;
737 else {
738 padding_leftover = FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length - extra_padding_bytes_required;
739 padding_is_last = iterator->is_last;
740 block->is_last = false;
741 }
742 }
743 if(!simple_iterator_pop_(iterator))
744 return false;
745 }
746 }
747 if(use_padding) {
748 if(padding_leftover == 0) {
749 ret = write_metadata_block_stationary_(iterator, block);
750 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
751 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
752 return ret;
753 }
754 else {
755 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
756 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
757 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
758 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
759 return ret;
760 }
761 }
762 else {
763 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
764 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
765 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
766 return ret;
767 }
768 }
769 }
770
FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator * iterator,FLAC__StreamMetadata * block,FLAC__bool use_padding)771 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
772 {
773 unsigned padding_leftover = 0;
774 FLAC__bool padding_is_last = false;
775
776 FLAC__ASSERT_DECLARATION(off_t debug_target_offset = iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length;)
777 FLAC__bool ret;
778
779 FLAC__ASSERT(0 != iterator);
780 FLAC__ASSERT(0 != iterator->file);
781 FLAC__ASSERT(0 != block);
782
783 if(!iterator->is_writable)
784 return false;
785
786 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) {
787 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
788 return false;
789 }
790
791 block->is_last = iterator->is_last;
792
793 if(use_padding) {
794 /* first see if we can even use padding */
795 if(iterator->is_last) {
796 use_padding = false;
797 }
798 else {
799 simple_iterator_push_(iterator);
800 if(!FLAC__metadata_simple_iterator_next(iterator)) {
801 (void)simple_iterator_pop_(iterator);
802 return false;
803 }
804 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
805 use_padding = false;
806 }
807 else {
808 if(iterator->length == block->length) {
809 padding_leftover = 0;
810 block->is_last = iterator->is_last;
811 }
812 else if(iterator->length < FLAC__STREAM_METADATA_HEADER_LENGTH + block->length)
813 use_padding = false;
814 else {
815 padding_leftover = iterator->length - block->length;
816 padding_is_last = iterator->is_last;
817 block->is_last = false;
818 }
819 }
820 if(!simple_iterator_pop_(iterator))
821 return false;
822 }
823 }
824 if(use_padding) {
825 /* move to the next block, which is suitable padding */
826 if(!FLAC__metadata_simple_iterator_next(iterator))
827 return false;
828 if(padding_leftover == 0) {
829 ret = write_metadata_block_stationary_(iterator, block);
830 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
831 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
832 return ret;
833 }
834 else {
835 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
836 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
837 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
838 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
839 return ret;
840 }
841 }
842 else {
843 ret = rewrite_whole_file_(iterator, block, /*append=*/true);
844 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
845 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
846 return ret;
847 }
848 }
849
FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator * iterator,FLAC__bool use_padding)850 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool use_padding)
851 {
852 FLAC__ASSERT_DECLARATION(off_t debug_target_offset = iterator->offset[iterator->depth];)
853 FLAC__bool ret;
854
855 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO) {
856 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
857 return false;
858 }
859
860 if(use_padding) {
861 FLAC__StreamMetadata *padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
862 if(0 == padding) {
863 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
864 return false;
865 }
866 padding->length = iterator->length;
867 if(!FLAC__metadata_simple_iterator_set_block(iterator, padding, false)) {
868 FLAC__metadata_object_delete(padding);
869 return false;
870 }
871 FLAC__metadata_object_delete(padding);
872 if(!FLAC__metadata_simple_iterator_prev(iterator))
873 return false;
874 FLAC__ASSERT(iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length == debug_target_offset);
875 FLAC__ASSERT(ftello(iterator->file) + (off_t)iterator->length == debug_target_offset);
876 return true;
877 }
878 else {
879 ret = rewrite_whole_file_(iterator, 0, /*append=*/false);
880 FLAC__ASSERT(iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length == debug_target_offset);
881 FLAC__ASSERT(ftello(iterator->file) + (off_t)iterator->length == debug_target_offset);
882 return ret;
883 }
884 }
885
886
887
888 /****************************************************************************
889 *
890 * Level 2 implementation
891 *
892 ***************************************************************************/
893
894
895 typedef struct FLAC__Metadata_Node {
896 FLAC__StreamMetadata *data;
897 struct FLAC__Metadata_Node *prev, *next;
898 } FLAC__Metadata_Node;
899
900 struct FLAC__Metadata_Chain {
901 char *filename; /* will be NULL if using callbacks */
902 FLAC__bool is_ogg;
903 FLAC__Metadata_Node *head;
904 FLAC__Metadata_Node *tail;
905 unsigned nodes;
906 FLAC__Metadata_ChainStatus status;
907 off_t first_offset, last_offset;
908 /*
909 * This is the length of the chain initially read from the FLAC file.
910 * it is used to compare against the current length to decide whether
911 * or not the whole file has to be rewritten.
912 */
913 off_t initial_length;
914 /* @@@ hacky, these are currently only needed by ogg reader */
915 FLAC__IOHandle handle;
916 FLAC__IOCallback_Read read_cb;
917 };
918
919 struct FLAC__Metadata_Iterator {
920 FLAC__Metadata_Chain *chain;
921 FLAC__Metadata_Node *current;
922 };
923
924 FLAC_API const char * const FLAC__Metadata_ChainStatusString[] = {
925 "FLAC__METADATA_CHAIN_STATUS_OK",
926 "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT",
927 "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE",
928 "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE",
929 "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE",
930 "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA",
931 "FLAC__METADATA_CHAIN_STATUS_READ_ERROR",
932 "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR",
933 "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR",
934 "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR",
935 "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR",
936 "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR",
937 "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR",
938 "FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS",
939 "FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH",
940 "FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL"
941 };
942
943
node_new_(void)944 static FLAC__Metadata_Node *node_new_(void)
945 {
946 return (FLAC__Metadata_Node*)calloc(1, sizeof(FLAC__Metadata_Node));
947 }
948
node_delete_(FLAC__Metadata_Node * node)949 static void node_delete_(FLAC__Metadata_Node *node)
950 {
951 FLAC__ASSERT(0 != node);
952 if(0 != node->data)
953 FLAC__metadata_object_delete(node->data);
954 free(node);
955 }
956
chain_init_(FLAC__Metadata_Chain * chain)957 static void chain_init_(FLAC__Metadata_Chain *chain)
958 {
959 FLAC__ASSERT(0 != chain);
960
961 chain->filename = 0;
962 chain->is_ogg = false;
963 chain->head = chain->tail = 0;
964 chain->nodes = 0;
965 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
966 chain->initial_length = 0;
967 chain->read_cb = 0;
968 }
969
chain_clear_(FLAC__Metadata_Chain * chain)970 static void chain_clear_(FLAC__Metadata_Chain *chain)
971 {
972 FLAC__Metadata_Node *node, *next;
973
974 FLAC__ASSERT(0 != chain);
975
976 for(node = chain->head; node; ) {
977 next = node->next;
978 node_delete_(node);
979 node = next;
980 }
981
982 if(0 != chain->filename)
983 free(chain->filename);
984
985 chain_init_(chain);
986 }
987
chain_append_node_(FLAC__Metadata_Chain * chain,FLAC__Metadata_Node * node)988 static void chain_append_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
989 {
990 FLAC__ASSERT(0 != chain);
991 FLAC__ASSERT(0 != node);
992 FLAC__ASSERT(0 != node->data);
993
994 node->next = node->prev = 0;
995 node->data->is_last = true;
996 if(0 != chain->tail)
997 chain->tail->data->is_last = false;
998
999 if(0 == chain->head)
1000 chain->head = node;
1001 else {
1002 FLAC__ASSERT(0 != chain->tail);
1003 chain->tail->next = node;
1004 node->prev = chain->tail;
1005 }
1006 chain->tail = node;
1007 chain->nodes++;
1008 }
1009
chain_remove_node_(FLAC__Metadata_Chain * chain,FLAC__Metadata_Node * node)1010 static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
1011 {
1012 FLAC__ASSERT(0 != chain);
1013 FLAC__ASSERT(0 != node);
1014
1015 if(node == chain->head)
1016 chain->head = node->next;
1017 else
1018 node->prev->next = node->next;
1019
1020 if(node == chain->tail)
1021 chain->tail = node->prev;
1022 else
1023 node->next->prev = node->prev;
1024
1025 if(0 != chain->tail)
1026 chain->tail->data->is_last = true;
1027
1028 chain->nodes--;
1029 }
1030
chain_delete_node_(FLAC__Metadata_Chain * chain,FLAC__Metadata_Node * node)1031 static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
1032 {
1033 chain_remove_node_(chain, node);
1034 node_delete_(node);
1035 }
1036
chain_calculate_length_(FLAC__Metadata_Chain * chain)1037 static off_t chain_calculate_length_(FLAC__Metadata_Chain *chain)
1038 {
1039 const FLAC__Metadata_Node *node;
1040 off_t length = 0;
1041 for(node = chain->head; node; node = node->next)
1042 length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1043 return length;
1044 }
1045
iterator_insert_node_(FLAC__Metadata_Iterator * iterator,FLAC__Metadata_Node * node)1046 static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
1047 {
1048 FLAC__ASSERT(0 != node);
1049 FLAC__ASSERT(0 != node->data);
1050 FLAC__ASSERT(0 != iterator);
1051 FLAC__ASSERT(0 != iterator->current);
1052 FLAC__ASSERT(0 != iterator->chain);
1053 FLAC__ASSERT(0 != iterator->chain->head);
1054 FLAC__ASSERT(0 != iterator->chain->tail);
1055
1056 node->data->is_last = false;
1057
1058 node->prev = iterator->current->prev;
1059 node->next = iterator->current;
1060
1061 if(0 == node->prev)
1062 iterator->chain->head = node;
1063 else
1064 node->prev->next = node;
1065
1066 iterator->current->prev = node;
1067
1068 iterator->chain->nodes++;
1069 }
1070
iterator_insert_node_after_(FLAC__Metadata_Iterator * iterator,FLAC__Metadata_Node * node)1071 static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
1072 {
1073 FLAC__ASSERT(0 != node);
1074 FLAC__ASSERT(0 != node->data);
1075 FLAC__ASSERT(0 != iterator);
1076 FLAC__ASSERT(0 != iterator->current);
1077 FLAC__ASSERT(0 != iterator->chain);
1078 FLAC__ASSERT(0 != iterator->chain->head);
1079 FLAC__ASSERT(0 != iterator->chain->tail);
1080
1081 iterator->current->data->is_last = false;
1082
1083 node->prev = iterator->current;
1084 node->next = iterator->current->next;
1085
1086 if(0 == node->next)
1087 iterator->chain->tail = node;
1088 else
1089 node->next->prev = node;
1090
1091 node->prev->next = node;
1092
1093 iterator->chain->tail->data->is_last = true;
1094
1095 iterator->chain->nodes++;
1096 }
1097
1098 /* return true iff node and node->next are both padding */
chain_merge_adjacent_padding_(FLAC__Metadata_Chain * chain,FLAC__Metadata_Node * node)1099 static FLAC__bool chain_merge_adjacent_padding_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
1100 {
1101 if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) {
1102 const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length;
1103 node->data->length += growth;
1104
1105 chain_delete_node_(chain, node->next);
1106 return true;
1107 }
1108 else
1109 return false;
1110 }
1111
1112 /* Returns the new length of the chain, or 0 if there was an error. */
1113 /* WATCHOUT: This can get called multiple times before a write, so
1114 * it should still work when this happens.
1115 */
1116 /* WATCHOUT: Make sure to also update the logic in
1117 * FLAC__metadata_chain_check_if_tempfile_needed() if the logic here changes.
1118 */
chain_prepare_for_write_(FLAC__Metadata_Chain * chain,FLAC__bool use_padding)1119 static off_t chain_prepare_for_write_(FLAC__Metadata_Chain *chain, FLAC__bool use_padding)
1120 {
1121 off_t current_length = chain_calculate_length_(chain);
1122
1123 if(use_padding) {
1124 /* if the metadata shrank and the last block is padding, we just extend the last padding block */
1125 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1126 const off_t delta = chain->initial_length - current_length;
1127 chain->tail->data->length += delta;
1128 current_length += delta;
1129 FLAC__ASSERT(current_length == chain->initial_length);
1130 }
1131 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */
1132 else if(current_length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
1133 FLAC__StreamMetadata *padding;
1134 FLAC__Metadata_Node *node;
1135 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) {
1136 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1137 return 0;
1138 }
1139 padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + current_length);
1140 if(0 == (node = node_new_())) {
1141 FLAC__metadata_object_delete(padding);
1142 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1143 return 0;
1144 }
1145 node->data = padding;
1146 chain_append_node_(chain, node);
1147 current_length = chain_calculate_length_(chain);
1148 FLAC__ASSERT(current_length == chain->initial_length);
1149 }
1150 /* 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 */
1151 else if(current_length > chain->initial_length) {
1152 const off_t delta = current_length - chain->initial_length;
1153 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1154 /* if the delta is exactly the size of the last padding block, remove the padding block */
1155 if((off_t)chain->tail->data->length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH == delta) {
1156 chain_delete_node_(chain, chain->tail);
1157 current_length = chain_calculate_length_(chain);
1158 FLAC__ASSERT(current_length == chain->initial_length);
1159 }
1160 /* if there is at least 'delta' bytes of padding, trim the padding down */
1161 else if((off_t)chain->tail->data->length >= delta) {
1162 chain->tail->data->length -= delta;
1163 current_length -= delta;
1164 FLAC__ASSERT(current_length == chain->initial_length);
1165 }
1166 }
1167 }
1168 }
1169
1170 return current_length;
1171 }
1172
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)1173 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)
1174 {
1175 FLAC__Metadata_Node *node;
1176
1177 FLAC__ASSERT(0 != chain);
1178
1179 /* we assume we're already at the beginning of the file */
1180
1181 switch(seek_to_first_metadata_block_cb_(handle, read_cb, seek_cb)) {
1182 case 0:
1183 break;
1184 case 1:
1185 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1186 return false;
1187 case 2:
1188 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1189 return false;
1190 case 3:
1191 chain->status = FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
1192 return false;
1193 default:
1194 FLAC__ASSERT(0);
1195 return false;
1196 }
1197
1198 {
1199 FLAC__int64 pos = tell_cb(handle);
1200 if(pos < 0) {
1201 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1202 return false;
1203 }
1204 chain->first_offset = (off_t)pos;
1205 }
1206
1207 {
1208 FLAC__bool is_last;
1209 FLAC__MetadataType type;
1210 unsigned length;
1211
1212 do {
1213 node = node_new_();
1214 if(0 == node) {
1215 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1216 return false;
1217 }
1218
1219 if(!read_metadata_block_header_cb_(handle, read_cb, &is_last, &type, &length)) {
1220 node_delete_(node);
1221 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1222 return false;
1223 }
1224
1225 node->data = FLAC__metadata_object_new(type);
1226 if(0 == node->data) {
1227 node_delete_(node);
1228 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1229 return false;
1230 }
1231
1232 node->data->is_last = is_last;
1233 node->data->length = length;
1234
1235 chain->status = get_equivalent_status_(read_metadata_block_data_cb_(handle, read_cb, seek_cb, node->data));
1236 if(chain->status != FLAC__METADATA_CHAIN_STATUS_OK) {
1237 node_delete_(node);
1238 return false;
1239 }
1240 chain_append_node_(chain, node);
1241 } while(!is_last);
1242 }
1243
1244 {
1245 FLAC__int64 pos = tell_cb(handle);
1246 if(pos < 0) {
1247 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1248 return false;
1249 }
1250 chain->last_offset = (off_t)pos;
1251 }
1252
1253 chain->initial_length = chain_calculate_length_(chain);
1254
1255 return true;
1256 }
1257
chain_read_ogg_read_cb_(const FLAC__StreamDecoder * decoder,FLAC__byte buffer[],size_t * bytes,void * client_data)1258 static FLAC__StreamDecoderReadStatus chain_read_ogg_read_cb_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
1259 {
1260 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data;
1261 (void)decoder;
1262 if(*bytes > 0 && chain->status == FLAC__METADATA_CHAIN_STATUS_OK) {
1263 *bytes = chain->read_cb(buffer, sizeof(FLAC__byte), *bytes, chain->handle);
1264 if(*bytes == 0)
1265 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
1266 else
1267 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
1268 }
1269 else
1270 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
1271 }
1272
chain_read_ogg_write_cb_(const FLAC__StreamDecoder * decoder,const FLAC__Frame * frame,const FLAC__int32 * const buffer[],void * client_data)1273 static FLAC__StreamDecoderWriteStatus chain_read_ogg_write_cb_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
1274 {
1275 (void)decoder, (void)frame, (void)buffer, (void)client_data;
1276 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
1277 }
1278
chain_read_ogg_metadata_cb_(const FLAC__StreamDecoder * decoder,const FLAC__StreamMetadata * metadata,void * client_data)1279 static void chain_read_ogg_metadata_cb_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
1280 {
1281 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data;
1282 FLAC__Metadata_Node *node;
1283
1284 (void)decoder;
1285
1286 node = node_new_();
1287 if(0 == node) {
1288 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1289 return;
1290 }
1291
1292 node->data = FLAC__metadata_object_clone(metadata);
1293 if(0 == node->data) {
1294 node_delete_(node);
1295 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1296 return;
1297 }
1298
1299 chain_append_node_(chain, node);
1300 }
1301
chain_read_ogg_error_cb_(const FLAC__StreamDecoder * decoder,FLAC__StreamDecoderErrorStatus status,void * client_data)1302 static void chain_read_ogg_error_cb_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
1303 {
1304 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data;
1305 (void)decoder, (void)status;
1306 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */
1307 }
1308
chain_read_ogg_cb_(FLAC__Metadata_Chain * chain,FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb)1309 static FLAC__bool chain_read_ogg_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb)
1310 {
1311 FLAC__StreamDecoder *decoder;
1312
1313 FLAC__ASSERT(0 != chain);
1314
1315 /* we assume we're already at the beginning of the file */
1316
1317 chain->handle = handle;
1318 chain->read_cb = read_cb;
1319 if(0 == (decoder = FLAC__stream_decoder_new())) {
1320 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1321 return false;
1322 }
1323 FLAC__stream_decoder_set_metadata_respond_all(decoder);
1324 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) {
1325 FLAC__stream_decoder_delete(decoder);
1326 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */
1327 return false;
1328 }
1329
1330 chain->first_offset = 0; /*@@@ wrong; will need to be set correctly to implement metadata writing for Ogg FLAC */
1331
1332 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder))
1333 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */
1334 if(chain->status != FLAC__METADATA_CHAIN_STATUS_OK) {
1335 FLAC__stream_decoder_delete(decoder);
1336 return false;
1337 }
1338
1339 FLAC__stream_decoder_delete(decoder);
1340
1341 chain->last_offset = 0; /*@@@ wrong; will need to be set correctly to implement metadata writing for Ogg FLAC */
1342
1343 chain->initial_length = chain_calculate_length_(chain);
1344
1345 return true;
1346 }
1347
chain_rewrite_metadata_in_place_cb_(FLAC__Metadata_Chain * chain,FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,FLAC__IOCallback_Seek seek_cb)1348 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)
1349 {
1350 FLAC__Metadata_Node *node;
1351
1352 FLAC__ASSERT(0 != chain);
1353 FLAC__ASSERT(0 != chain->head);
1354
1355 if(0 != seek_cb(handle, chain->first_offset, SEEK_SET)) {
1356 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1357 return false;
1358 }
1359
1360 for(node = chain->head; node; node = node->next) {
1361 if(!write_metadata_block_header_cb_(handle, write_cb, node->data)) {
1362 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1363 return false;
1364 }
1365 if(!write_metadata_block_data_cb_(handle, write_cb, node->data)) {
1366 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1367 return false;
1368 }
1369 }
1370
1371 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1372
1373 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
1374 return true;
1375 }
1376
chain_rewrite_metadata_in_place_(FLAC__Metadata_Chain * chain)1377 static FLAC__bool chain_rewrite_metadata_in_place_(FLAC__Metadata_Chain *chain)
1378 {
1379 FILE *file;
1380 FLAC__bool ret;
1381
1382 FLAC__ASSERT(0 != chain->filename);
1383
1384 if(0 == (file = fopen(chain->filename, "r+b"))) {
1385 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1386 return false;
1387 }
1388
1389 /* chain_rewrite_metadata_in_place_cb_() sets chain->status for us */
1390 ret = chain_rewrite_metadata_in_place_cb_(chain, (FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, fseek_wrapper_);
1391
1392 fclose(file);
1393
1394 return ret;
1395 }
1396
chain_rewrite_file_(FLAC__Metadata_Chain * chain,const char * tempfile_path_prefix)1397 static FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix)
1398 {
1399 FILE *f, *tempfile;
1400 char *tempfilename;
1401 FLAC__Metadata_SimpleIteratorStatus status;
1402 const FLAC__Metadata_Node *node;
1403
1404 FLAC__ASSERT(0 != chain);
1405 FLAC__ASSERT(0 != chain->filename);
1406 FLAC__ASSERT(0 != chain->head);
1407
1408 /* copy the file prefix (data up to first metadata block */
1409 if(0 == (f = fopen(chain->filename, "rb"))) {
1410 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1411 return false;
1412 }
1413 if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) {
1414 chain->status = get_equivalent_status_(status);
1415 cleanup_tempfile_(&tempfile, &tempfilename);
1416 return false;
1417 }
1418 if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) {
1419 chain->status = get_equivalent_status_(status);
1420 cleanup_tempfile_(&tempfile, &tempfilename);
1421 return false;
1422 }
1423
1424 /* write the metadata */
1425 for(node = chain->head; node; node = node->next) {
1426 if(!write_metadata_block_header_(tempfile, &status, node->data)) {
1427 chain->status = get_equivalent_status_(status);
1428 return false;
1429 }
1430 if(!write_metadata_block_data_(tempfile, &status, node->data)) {
1431 chain->status = get_equivalent_status_(status);
1432 return false;
1433 }
1434 }
1435 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1436
1437 /* copy the file postfix (everything after the metadata) */
1438 if(0 != fseeko(f, chain->last_offset, SEEK_SET)) {
1439 cleanup_tempfile_(&tempfile, &tempfilename);
1440 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1441 return false;
1442 }
1443 if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) {
1444 cleanup_tempfile_(&tempfile, &tempfilename);
1445 chain->status = get_equivalent_status_(status);
1446 return false;
1447 }
1448
1449 /* move the tempfile on top of the original */
1450 (void)fclose(f);
1451 if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status))
1452 return false;
1453
1454 return true;
1455 }
1456
1457 /* 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)1458 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)
1459 {
1460 FLAC__Metadata_SimpleIteratorStatus status;
1461 const FLAC__Metadata_Node *node;
1462
1463 FLAC__ASSERT(0 != chain);
1464 FLAC__ASSERT(0 == chain->filename);
1465 FLAC__ASSERT(0 != chain->head);
1466
1467 /* copy the file prefix (data up to first metadata block */
1468 if(!copy_n_bytes_from_file_cb_(handle, read_cb, temp_handle, temp_write_cb, chain->first_offset, &status)) {
1469 chain->status = get_equivalent_status_(status);
1470 return false;
1471 }
1472
1473 /* write the metadata */
1474 for(node = chain->head; node; node = node->next) {
1475 if(!write_metadata_block_header_cb_(temp_handle, temp_write_cb, node->data)) {
1476 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1477 return false;
1478 }
1479 if(!write_metadata_block_data_cb_(temp_handle, temp_write_cb, node->data)) {
1480 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1481 return false;
1482 }
1483 }
1484 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1485
1486 /* copy the file postfix (everything after the metadata) */
1487 if(0 != seek_cb(handle, chain->last_offset, SEEK_SET)) {
1488 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1489 return false;
1490 }
1491 if(!copy_remaining_bytes_from_file_cb_(handle, read_cb, eof_cb, temp_handle, temp_write_cb, &status)) {
1492 chain->status = get_equivalent_status_(status);
1493 return false;
1494 }
1495
1496 return true;
1497 }
1498
FLAC__metadata_chain_new(void)1499 FLAC_API FLAC__Metadata_Chain *FLAC__metadata_chain_new(void)
1500 {
1501 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)calloc(1, sizeof(FLAC__Metadata_Chain));
1502
1503 if(0 != chain)
1504 chain_init_(chain);
1505
1506 return chain;
1507 }
1508
FLAC__metadata_chain_delete(FLAC__Metadata_Chain * chain)1509 FLAC_API void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain)
1510 {
1511 FLAC__ASSERT(0 != chain);
1512
1513 chain_clear_(chain);
1514
1515 free(chain);
1516 }
1517
FLAC__metadata_chain_status(FLAC__Metadata_Chain * chain)1518 FLAC_API FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain)
1519 {
1520 FLAC__Metadata_ChainStatus status;
1521
1522 FLAC__ASSERT(0 != chain);
1523
1524 status = chain->status;
1525 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
1526 return status;
1527 }
1528
chain_read_(FLAC__Metadata_Chain * chain,const char * filename,FLAC__bool is_ogg)1529 static FLAC__bool chain_read_(FLAC__Metadata_Chain *chain, const char *filename, FLAC__bool is_ogg)
1530 {
1531 FILE *file;
1532 FLAC__bool ret;
1533
1534 FLAC__ASSERT(0 != chain);
1535 FLAC__ASSERT(0 != filename);
1536
1537 chain_clear_(chain);
1538
1539 if(0 == (chain->filename = strdup(filename))) {
1540 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1541 return false;
1542 }
1543
1544 chain->is_ogg = is_ogg;
1545
1546 if(0 == (file = fopen(filename, "rb"))) {
1547 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1548 return false;
1549 }
1550
1551 /* the function also sets chain->status for us */
1552 ret = is_ogg?
1553 chain_read_ogg_cb_(chain, file, (FLAC__IOCallback_Read)fread) :
1554 chain_read_cb_(chain, file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, ftell_wrapper_)
1555 ;
1556
1557 fclose(file);
1558
1559 return ret;
1560 }
1561
FLAC__metadata_chain_read(FLAC__Metadata_Chain * chain,const char * filename)1562 FLAC_API FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename)
1563 {
1564 return chain_read_(chain, filename, /*is_ogg=*/false);
1565 }
1566
1567 /*@@@@add to tests*/
FLAC__metadata_chain_read_ogg(FLAC__Metadata_Chain * chain,const char * filename)1568 FLAC_API FLAC__bool FLAC__metadata_chain_read_ogg(FLAC__Metadata_Chain *chain, const char *filename)
1569 {
1570 return chain_read_(chain, filename, /*is_ogg=*/true);
1571 }
1572
chain_read_with_callbacks_(FLAC__Metadata_Chain * chain,FLAC__IOHandle handle,FLAC__IOCallbacks callbacks,FLAC__bool is_ogg)1573 static FLAC__bool chain_read_with_callbacks_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks, FLAC__bool is_ogg)
1574 {
1575 FLAC__bool ret;
1576
1577 FLAC__ASSERT(0 != chain);
1578
1579 chain_clear_(chain);
1580
1581 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.tell) {
1582 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1583 return false;
1584 }
1585
1586 chain->is_ogg = is_ogg;
1587
1588 /* rewind */
1589 if(0 != callbacks.seek(handle, 0, SEEK_SET)) {
1590 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1591 return false;
1592 }
1593
1594 /* the function also sets chain->status for us */
1595 ret = is_ogg?
1596 chain_read_ogg_cb_(chain, handle, callbacks.read) :
1597 chain_read_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.tell)
1598 ;
1599
1600 return ret;
1601 }
1602
FLAC__metadata_chain_read_with_callbacks(FLAC__Metadata_Chain * chain,FLAC__IOHandle handle,FLAC__IOCallbacks callbacks)1603 FLAC_API FLAC__bool FLAC__metadata_chain_read_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1604 {
1605 return chain_read_with_callbacks_(chain, handle, callbacks, /*is_ogg=*/false);
1606 }
1607
1608 /*@@@@add to tests*/
FLAC__metadata_chain_read_ogg_with_callbacks(FLAC__Metadata_Chain * chain,FLAC__IOHandle handle,FLAC__IOCallbacks callbacks)1609 FLAC_API FLAC__bool FLAC__metadata_chain_read_ogg_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1610 {
1611 return chain_read_with_callbacks_(chain, handle, callbacks, /*is_ogg=*/true);
1612 }
1613
FLAC__metadata_chain_check_if_tempfile_needed(FLAC__Metadata_Chain * chain,FLAC__bool use_padding)1614 FLAC_API FLAC__bool FLAC__metadata_chain_check_if_tempfile_needed(FLAC__Metadata_Chain *chain, FLAC__bool use_padding)
1615 {
1616 /* This does all the same checks that are in chain_prepare_for_write_()
1617 * but doesn't actually alter the chain. Make sure to update the logic
1618 * here if chain_prepare_for_write_() changes.
1619 */
1620 const off_t current_length = chain_calculate_length_(chain);
1621
1622 FLAC__ASSERT(0 != chain);
1623
1624 if(use_padding) {
1625 /* if the metadata shrank and the last block is padding, we just extend the last padding block */
1626 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING)
1627 return false;
1628 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */
1629 else if(current_length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length)
1630 return false;
1631 /* 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 */
1632 else if(current_length > chain->initial_length) {
1633 const off_t delta = current_length - chain->initial_length;
1634 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1635 /* if the delta is exactly the size of the last padding block, remove the padding block */
1636 if((off_t)chain->tail->data->length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH == delta)
1637 return false;
1638 /* if there is at least 'delta' bytes of padding, trim the padding down */
1639 else if((off_t)chain->tail->data->length >= delta)
1640 return false;
1641 }
1642 }
1643 }
1644
1645 return (current_length != chain->initial_length);
1646 }
1647
FLAC__metadata_chain_write(FLAC__Metadata_Chain * chain,FLAC__bool use_padding,FLAC__bool preserve_file_stats)1648 FLAC_API FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats)
1649 {
1650 struct stat stats;
1651 const char *tempfile_path_prefix = 0;
1652 off_t current_length;
1653
1654 FLAC__ASSERT(0 != chain);
1655
1656 if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */
1657 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;
1658 return false;
1659 }
1660
1661 if (0 == chain->filename) {
1662 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1663 return false;
1664 }
1665
1666 current_length = chain_prepare_for_write_(chain, use_padding);
1667
1668 /* a return value of 0 means there was an error; chain->status is already set */
1669 if (0 == current_length)
1670 return false;
1671
1672 if(preserve_file_stats)
1673 get_file_stats_(chain->filename, &stats);
1674
1675 if(current_length == chain->initial_length) {
1676 if(!chain_rewrite_metadata_in_place_(chain))
1677 return false;
1678 }
1679 else {
1680 if(!chain_rewrite_file_(chain, tempfile_path_prefix))
1681 return false;
1682
1683 /* recompute lengths and offsets */
1684 {
1685 const FLAC__Metadata_Node *node;
1686 chain->initial_length = current_length;
1687 chain->last_offset = chain->first_offset;
1688 for(node = chain->head; node; node = node->next)
1689 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1690 }
1691 }
1692
1693 if(preserve_file_stats)
1694 set_file_stats_(chain->filename, &stats);
1695
1696 return true;
1697 }
1698
FLAC__metadata_chain_write_with_callbacks(FLAC__Metadata_Chain * chain,FLAC__bool use_padding,FLAC__IOHandle handle,FLAC__IOCallbacks callbacks)1699 FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1700 {
1701 off_t current_length;
1702
1703 FLAC__ASSERT(0 != chain);
1704
1705 if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */
1706 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;
1707 return false;
1708 }
1709
1710 if (0 != chain->filename) {
1711 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1712 return false;
1713 }
1714
1715 if (0 == callbacks.write || 0 == callbacks.seek) {
1716 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1717 return false;
1718 }
1719
1720 if (FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) {
1721 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL;
1722 return false;
1723 }
1724
1725 current_length = chain_prepare_for_write_(chain, use_padding);
1726
1727 /* a return value of 0 means there was an error; chain->status is already set */
1728 if (0 == current_length)
1729 return false;
1730
1731 FLAC__ASSERT(current_length == chain->initial_length);
1732
1733 return chain_rewrite_metadata_in_place_cb_(chain, handle, callbacks.write, callbacks.seek);
1734 }
1735
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)1736 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)
1737 {
1738 off_t current_length;
1739
1740 FLAC__ASSERT(0 != chain);
1741
1742 if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */
1743 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;
1744 return false;
1745 }
1746
1747 if (0 != chain->filename) {
1748 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1749 return false;
1750 }
1751
1752 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.eof) {
1753 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1754 return false;
1755 }
1756 if (0 == temp_callbacks.write) {
1757 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1758 return false;
1759 }
1760
1761 if (!FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) {
1762 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL;
1763 return false;
1764 }
1765
1766 current_length = chain_prepare_for_write_(chain, use_padding);
1767
1768 /* a return value of 0 means there was an error; chain->status is already set */
1769 if (0 == current_length)
1770 return false;
1771
1772 FLAC__ASSERT(current_length != chain->initial_length);
1773
1774 /* rewind */
1775 if(0 != callbacks.seek(handle, 0, SEEK_SET)) {
1776 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1777 return false;
1778 }
1779
1780 if(!chain_rewrite_file_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.eof, temp_handle, temp_callbacks.write))
1781 return false;
1782
1783 /* recompute lengths and offsets */
1784 {
1785 const FLAC__Metadata_Node *node;
1786 chain->initial_length = current_length;
1787 chain->last_offset = chain->first_offset;
1788 for(node = chain->head; node; node = node->next)
1789 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1790 }
1791
1792 return true;
1793 }
1794
FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain * chain)1795 FLAC_API void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain)
1796 {
1797 FLAC__Metadata_Node *node;
1798
1799 FLAC__ASSERT(0 != chain);
1800
1801 for(node = chain->head; node; ) {
1802 if(!chain_merge_adjacent_padding_(chain, node))
1803 node = node->next;
1804 }
1805 }
1806
FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain * chain)1807 FLAC_API void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain)
1808 {
1809 FLAC__Metadata_Node *node, *save;
1810 unsigned i;
1811
1812 FLAC__ASSERT(0 != chain);
1813
1814 /*
1815 * Don't try and be too smart... this simple algo is good enough for
1816 * the small number of nodes that we deal with.
1817 */
1818 for(i = 0, node = chain->head; i < chain->nodes; i++) {
1819 if(node->data->type == FLAC__METADATA_TYPE_PADDING) {
1820 save = node->next;
1821 chain_remove_node_(chain, node);
1822 chain_append_node_(chain, node);
1823 node = save;
1824 }
1825 else {
1826 node = node->next;
1827 }
1828 }
1829
1830 FLAC__metadata_chain_merge_padding(chain);
1831 }
1832
1833
FLAC__metadata_iterator_new(void)1834 FLAC_API FLAC__Metadata_Iterator *FLAC__metadata_iterator_new(void)
1835 {
1836 FLAC__Metadata_Iterator *iterator = (FLAC__Metadata_Iterator*)calloc(1, sizeof(FLAC__Metadata_Iterator));
1837
1838 /* calloc() implies:
1839 iterator->current = 0;
1840 iterator->chain = 0;
1841 */
1842
1843 return iterator;
1844 }
1845
FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator * iterator)1846 FLAC_API void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator)
1847 {
1848 FLAC__ASSERT(0 != iterator);
1849
1850 free(iterator);
1851 }
1852
FLAC__metadata_iterator_init(FLAC__Metadata_Iterator * iterator,FLAC__Metadata_Chain * chain)1853 FLAC_API void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain)
1854 {
1855 FLAC__ASSERT(0 != iterator);
1856 FLAC__ASSERT(0 != chain);
1857 FLAC__ASSERT(0 != chain->head);
1858
1859 iterator->chain = chain;
1860 iterator->current = chain->head;
1861 }
1862
FLAC__metadata_iterator_next(FLAC__Metadata_Iterator * iterator)1863 FLAC_API FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator)
1864 {
1865 FLAC__ASSERT(0 != iterator);
1866
1867 if(0 == iterator->current || 0 == iterator->current->next)
1868 return false;
1869
1870 iterator->current = iterator->current->next;
1871 return true;
1872 }
1873
FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator * iterator)1874 FLAC_API FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator)
1875 {
1876 FLAC__ASSERT(0 != iterator);
1877
1878 if(0 == iterator->current || 0 == iterator->current->prev)
1879 return false;
1880
1881 iterator->current = iterator->current->prev;
1882 return true;
1883 }
1884
FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator * iterator)1885 FLAC_API FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator)
1886 {
1887 FLAC__ASSERT(0 != iterator);
1888 FLAC__ASSERT(0 != iterator->current);
1889 FLAC__ASSERT(0 != iterator->current->data);
1890
1891 return iterator->current->data->type;
1892 }
1893
FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator * iterator)1894 FLAC_API FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator)
1895 {
1896 FLAC__ASSERT(0 != iterator);
1897 FLAC__ASSERT(0 != iterator->current);
1898
1899 return iterator->current->data;
1900 }
1901
FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator * iterator,FLAC__StreamMetadata * block)1902 FLAC_API FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1903 {
1904 FLAC__ASSERT(0 != iterator);
1905 FLAC__ASSERT(0 != block);
1906 return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block);
1907 }
1908
FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator * iterator,FLAC__bool replace_with_padding)1909 FLAC_API FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding)
1910 {
1911 FLAC__Metadata_Node *save;
1912
1913 FLAC__ASSERT(0 != iterator);
1914 FLAC__ASSERT(0 != iterator->current);
1915
1916 if(0 == iterator->current->prev) {
1917 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1918 return false;
1919 }
1920
1921 save = iterator->current->prev;
1922
1923 if(replace_with_padding) {
1924 FLAC__metadata_object_delete_data(iterator->current->data);
1925 iterator->current->data->type = FLAC__METADATA_TYPE_PADDING;
1926 }
1927 else {
1928 chain_delete_node_(iterator->chain, iterator->current);
1929 }
1930
1931 iterator->current = save;
1932 return true;
1933 }
1934
FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator * iterator,FLAC__StreamMetadata * block)1935 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1936 {
1937 FLAC__Metadata_Node *node;
1938
1939 FLAC__ASSERT(0 != iterator);
1940 FLAC__ASSERT(0 != iterator->current);
1941 FLAC__ASSERT(0 != block);
1942
1943 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1944 return false;
1945
1946 if(0 == iterator->current->prev) {
1947 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1948 return false;
1949 }
1950
1951 if(0 == (node = node_new_()))
1952 return false;
1953
1954 node->data = block;
1955 iterator_insert_node_(iterator, node);
1956 iterator->current = node;
1957 return true;
1958 }
1959
FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator * iterator,FLAC__StreamMetadata * block)1960 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1961 {
1962 FLAC__Metadata_Node *node;
1963
1964 FLAC__ASSERT(0 != iterator);
1965 FLAC__ASSERT(0 != iterator->current);
1966 FLAC__ASSERT(0 != block);
1967
1968 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1969 return false;
1970
1971 if(0 == (node = node_new_()))
1972 return false;
1973
1974 node->data = block;
1975 iterator_insert_node_after_(iterator, node);
1976 iterator->current = node;
1977 return true;
1978 }
1979
1980
1981 /****************************************************************************
1982 *
1983 * Local function definitions
1984 *
1985 ***************************************************************************/
1986
pack_uint32_(FLAC__uint32 val,FLAC__byte * b,unsigned bytes)1987 void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1988 {
1989 unsigned i;
1990
1991 b += bytes;
1992
1993 for(i = 0; i < bytes; i++) {
1994 *(--b) = (FLAC__byte)(val & 0xff);
1995 val >>= 8;
1996 }
1997 }
1998
pack_uint32_little_endian_(FLAC__uint32 val,FLAC__byte * b,unsigned bytes)1999 void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
2000 {
2001 unsigned i;
2002
2003 for(i = 0; i < bytes; i++) {
2004 *(b++) = (FLAC__byte)(val & 0xff);
2005 val >>= 8;
2006 }
2007 }
2008
pack_uint64_(FLAC__uint64 val,FLAC__byte * b,unsigned bytes)2009 void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes)
2010 {
2011 unsigned i;
2012
2013 b += bytes;
2014
2015 for(i = 0; i < bytes; i++) {
2016 *(--b) = (FLAC__byte)(val & 0xff);
2017 val >>= 8;
2018 }
2019 }
2020
unpack_uint32_(FLAC__byte * b,unsigned bytes)2021 FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes)
2022 {
2023 FLAC__uint32 ret = 0;
2024 unsigned i;
2025
2026 for(i = 0; i < bytes; i++)
2027 ret = (ret << 8) | (FLAC__uint32)(*b++);
2028
2029 return ret;
2030 }
2031
unpack_uint32_little_endian_(FLAC__byte * b,unsigned bytes)2032 FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes)
2033 {
2034 FLAC__uint32 ret = 0;
2035 unsigned i;
2036
2037 b += bytes;
2038
2039 for(i = 0; i < bytes; i++)
2040 ret = (ret << 8) | (FLAC__uint32)(*--b);
2041
2042 return ret;
2043 }
2044
unpack_uint64_(FLAC__byte * b,unsigned bytes)2045 FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes)
2046 {
2047 FLAC__uint64 ret = 0;
2048 unsigned i;
2049
2050 for(i = 0; i < bytes; i++)
2051 ret = (ret << 8) | (FLAC__uint64)(*b++);
2052
2053 return ret;
2054 }
2055
read_metadata_block_header_(FLAC__Metadata_SimpleIterator * iterator)2056 FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator)
2057 {
2058 FLAC__ASSERT(0 != iterator);
2059 FLAC__ASSERT(0 != iterator->file);
2060
2061 if(!read_metadata_block_header_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, &iterator->is_last, &iterator->type, &iterator->length)) {
2062 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2063 return false;
2064 }
2065
2066 return true;
2067 }
2068
read_metadata_block_data_(FLAC__Metadata_SimpleIterator * iterator,FLAC__StreamMetadata * block)2069 FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block)
2070 {
2071 FLAC__ASSERT(0 != iterator);
2072 FLAC__ASSERT(0 != iterator->file);
2073
2074 iterator->status = read_metadata_block_data_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, block);
2075
2076 return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
2077 }
2078
read_metadata_block_header_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__bool * is_last,FLAC__MetadataType * type,unsigned * length)2079 FLAC__bool read_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__bool *is_last, FLAC__MetadataType *type, unsigned *length)
2080 {
2081 FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH];
2082
2083 if(read_cb(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH)
2084 return false;
2085
2086 *is_last = raw_header[0] & 0x80? true : false;
2087 *type = (FLAC__MetadataType)(raw_header[0] & 0x7f);
2088 *length = unpack_uint32_(raw_header + 1, 3);
2089
2090 /* Note that we don't check:
2091 * if(iterator->type >= FLAC__METADATA_TYPE_UNDEFINED)
2092 * we just will read in an opaque block
2093 */
2094
2095 return true;
2096 }
2097
read_metadata_block_data_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__IOCallback_Seek seek_cb,FLAC__StreamMetadata * block)2098 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata *block)
2099 {
2100 switch(block->type) {
2101 case FLAC__METADATA_TYPE_STREAMINFO:
2102 return read_metadata_block_data_streaminfo_cb_(handle, read_cb, &block->data.stream_info);
2103 case FLAC__METADATA_TYPE_PADDING:
2104 return read_metadata_block_data_padding_cb_(handle, seek_cb, &block->data.padding, block->length);
2105 case FLAC__METADATA_TYPE_APPLICATION:
2106 return read_metadata_block_data_application_cb_(handle, read_cb, &block->data.application, block->length);
2107 case FLAC__METADATA_TYPE_SEEKTABLE:
2108 return read_metadata_block_data_seektable_cb_(handle, read_cb, &block->data.seek_table, block->length);
2109 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
2110 return read_metadata_block_data_vorbis_comment_cb_(handle, read_cb, &block->data.vorbis_comment);
2111 case FLAC__METADATA_TYPE_CUESHEET:
2112 return read_metadata_block_data_cuesheet_cb_(handle, read_cb, &block->data.cue_sheet);
2113 case FLAC__METADATA_TYPE_PICTURE:
2114 return read_metadata_block_data_picture_cb_(handle, read_cb, &block->data.picture);
2115 default:
2116 return read_metadata_block_data_unknown_cb_(handle, read_cb, &block->data.unknown, block->length);
2117 }
2118 }
2119
read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_StreamInfo * block)2120 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block)
2121 {
2122 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b;
2123
2124 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
2125 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2126
2127 b = buffer;
2128
2129 /* we are using hardcoded numbers for simplicity but we should
2130 * probably eventually write a bit-level unpacker and use the
2131 * _STREAMINFO_ constants.
2132 */
2133 block->min_blocksize = unpack_uint32_(b, 2); b += 2;
2134 block->max_blocksize = unpack_uint32_(b, 2); b += 2;
2135 block->min_framesize = unpack_uint32_(b, 3); b += 3;
2136 block->max_framesize = unpack_uint32_(b, 3); b += 3;
2137 block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4);
2138 block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
2139 block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 4) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1;
2140 block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4);
2141 memcpy(block->md5sum, b+8, 16);
2142
2143 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2144 }
2145
read_metadata_block_data_padding_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Seek seek_cb,FLAC__StreamMetadata_Padding * block,unsigned block_length)2146 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_Padding *block, unsigned block_length)
2147 {
2148 (void)block; /* nothing to do; we don't care about reading the padding bytes */
2149
2150 if(0 != seek_cb(handle, block_length, SEEK_CUR))
2151 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2152
2153 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2154 }
2155
read_metadata_block_data_application_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_Application * block,unsigned block_length)2156 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, unsigned block_length)
2157 {
2158 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
2159
2160 if(read_cb(block->id, 1, id_bytes, handle) != id_bytes)
2161 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2162
2163 if(block_length < id_bytes)
2164 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2165
2166 block_length -= id_bytes;
2167
2168 if(block_length == 0) {
2169 block->data = 0;
2170 }
2171 else {
2172 if(0 == (block->data = (FLAC__byte*)malloc(block_length)))
2173 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2174
2175 if(read_cb(block->data, 1, block_length, handle) != block_length)
2176 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2177 }
2178
2179 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2180 }
2181
read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_SeekTable * block,unsigned block_length)2182 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, unsigned block_length)
2183 {
2184 unsigned i;
2185 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
2186
2187 FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0);
2188
2189 block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
2190
2191 if(block->num_points == 0)
2192 block->points = 0;
2193 else if(0 == (block->points = (FLAC__StreamMetadata_SeekPoint*)safe_malloc_mul_2op_(block->num_points, /*times*/sizeof(FLAC__StreamMetadata_SeekPoint))))
2194 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2195
2196 for(i = 0; i < block->num_points; i++) {
2197 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
2198 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2199 /* some MAGIC NUMBERs here */
2200 block->points[i].sample_number = unpack_uint64_(buffer, 8);
2201 block->points[i].stream_offset = unpack_uint64_(buffer+8, 8);
2202 block->points[i].frame_samples = unpack_uint32_(buffer+16, 2);
2203 }
2204
2205 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2206 }
2207
read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_VorbisComment_Entry * entry)2208 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment_Entry *entry)
2209 {
2210 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
2211 FLAC__byte buffer[4]; /* magic number is asserted below */
2212
2213 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8 == sizeof(buffer));
2214
2215 if(read_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2216 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2217 entry->length = unpack_uint32_little_endian_(buffer, entry_length_len);
2218
2219 if(0 != entry->entry)
2220 free(entry->entry);
2221
2222 if(entry->length == 0) {
2223 entry->entry = 0;
2224 }
2225 else {
2226 if(0 == (entry->entry = (FLAC__byte*)safe_malloc_add_2op_(entry->length, /*+*/1)))
2227 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2228
2229 if(read_cb(entry->entry, 1, entry->length, handle) != entry->length)
2230 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2231
2232 entry->entry[entry->length] = '\0';
2233 }
2234
2235 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2236 }
2237
read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_VorbisComment * block)2238 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment *block)
2239 {
2240 unsigned i;
2241 FLAC__Metadata_SimpleIteratorStatus status;
2242 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
2243 FLAC__byte buffer[4]; /* magic number is asserted below */
2244
2245 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8 == sizeof(buffer));
2246
2247 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, &(block->vendor_string))))
2248 return status;
2249
2250 if(read_cb(buffer, 1, num_comments_len, handle) != num_comments_len)
2251 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2252 block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len);
2253
2254 if(block->num_comments == 0) {
2255 block->comments = 0;
2256 }
2257 else if(0 == (block->comments = (FLAC__StreamMetadata_VorbisComment_Entry*)calloc(block->num_comments, sizeof(FLAC__StreamMetadata_VorbisComment_Entry))))
2258 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2259
2260 for(i = 0; i < block->num_comments; i++) {
2261 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, block->comments + i)))
2262 return status;
2263 }
2264
2265 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2266 }
2267
read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_CueSheet_Track * track)2268 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track)
2269 {
2270 unsigned i, len;
2271 FLAC__byte buffer[32]; /* asserted below that this is big enough */
2272
2273 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
2274 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
2275 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);
2276
2277 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
2278 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
2279 if(read_cb(buffer, 1, len, handle) != len)
2280 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2281 track->offset = unpack_uint64_(buffer, len);
2282
2283 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
2284 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
2285 if(read_cb(buffer, 1, len, handle) != len)
2286 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2287 track->number = (FLAC__byte)unpack_uint32_(buffer, len);
2288
2289 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
2290 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
2291 if(read_cb(track->isrc, 1, len, handle) != len)
2292 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2293
2294 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);
2295 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
2296 if(read_cb(buffer, 1, len, handle) != len)
2297 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2298 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN == 1);
2299 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN == 1);
2300 track->type = buffer[0] >> 7;
2301 track->pre_emphasis = (buffer[0] >> 6) & 1;
2302
2303 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
2304 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
2305 if(read_cb(buffer, 1, len, handle) != len)
2306 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2307 track->num_indices = (FLAC__byte)unpack_uint32_(buffer, len);
2308
2309 if(track->num_indices == 0) {
2310 track->indices = 0;
2311 }
2312 else if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)calloc(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index))))
2313 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2314
2315 for(i = 0; i < track->num_indices; i++) {
2316 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
2317 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
2318 if(read_cb(buffer, 1, len, handle) != len)
2319 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2320 track->indices[i].offset = unpack_uint64_(buffer, len);
2321
2322 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
2323 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
2324 if(read_cb(buffer, 1, len, handle) != len)
2325 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2326 track->indices[i].number = (FLAC__byte)unpack_uint32_(buffer, len);
2327
2328 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
2329 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
2330 if(read_cb(buffer, 1, len, handle) != len)
2331 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2332 }
2333
2334 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2335 }
2336
read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_CueSheet * block)2337 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block)
2338 {
2339 unsigned i, len;
2340 FLAC__Metadata_SimpleIteratorStatus status;
2341 FLAC__byte buffer[1024]; /* MSVC needs a constant expression so we put a magic number and assert */
2342
2343 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN)/8 <= sizeof(buffer));
2344 FLAC__ASSERT(sizeof(FLAC__uint64) <= sizeof(buffer));
2345
2346 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
2347 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
2348 if(read_cb(block->media_catalog_number, 1, len, handle) != len)
2349 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2350
2351 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
2352 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
2353 if(read_cb(buffer, 1, len, handle) != len)
2354 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2355 block->lead_in = unpack_uint64_(buffer, len);
2356
2357 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
2358 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
2359 if(read_cb(buffer, 1, len, handle) != len)
2360 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2361 block->is_cd = buffer[0]&0x80? true : false;
2362
2363 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
2364 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
2365 if(read_cb(buffer, 1, len, handle) != len)
2366 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2367 block->num_tracks = unpack_uint32_(buffer, len);
2368
2369 if(block->num_tracks == 0) {
2370 block->tracks = 0;
2371 }
2372 else if(0 == (block->tracks = (FLAC__StreamMetadata_CueSheet_Track*)calloc(block->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track))))
2373 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2374
2375 for(i = 0; i < block->num_tracks; i++) {
2376 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_cuesheet_track_cb_(handle, read_cb, block->tracks + i)))
2377 return status;
2378 }
2379
2380 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2381 }
2382
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)2383 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)
2384 {
2385 FLAC__byte buffer[sizeof(FLAC__uint32)];
2386
2387 FLAC__ASSERT(0 != data);
2388 FLAC__ASSERT(length_len%8 == 0);
2389
2390 length_len /= 8; /* convert to bytes */
2391
2392 FLAC__ASSERT(sizeof(buffer) >= length_len);
2393
2394 if(read_cb(buffer, 1, length_len, handle) != length_len)
2395 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2396 *length = unpack_uint32_(buffer, length_len);
2397
2398 if(0 != *data)
2399 free(*data);
2400
2401 if(0 == (*data = (FLAC__byte*)safe_malloc_add_2op_(*length, /*+*/1)))
2402 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2403
2404 if(*length > 0) {
2405 if(read_cb(*data, 1, *length, handle) != *length)
2406 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2407 }
2408
2409 (*data)[*length] = '\0';
2410
2411 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2412 }
2413
read_metadata_block_data_picture_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_Picture * block)2414 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Picture *block)
2415 {
2416 FLAC__Metadata_SimpleIteratorStatus status;
2417 FLAC__byte buffer[4]; /* asserted below that this is big enough */
2418 FLAC__uint32 len;
2419
2420 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8);
2421 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8);
2422 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8);
2423 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8);
2424 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8);
2425
2426 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_TYPE_LEN % 8 == 0);
2427 len = FLAC__STREAM_METADATA_PICTURE_TYPE_LEN / 8;
2428 if(read_cb(buffer, 1, len, handle) != len)
2429 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2430 block->type = (FLAC__StreamMetadata_Picture_Type)unpack_uint32_(buffer, len);
2431
2432 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)
2433 return status;
2434
2435 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)
2436 return status;
2437
2438 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN % 8 == 0);
2439 len = FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN / 8;
2440 if(read_cb(buffer, 1, len, handle) != len)
2441 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2442 block->width = unpack_uint32_(buffer, len);
2443
2444 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN % 8 == 0);
2445 len = FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN / 8;
2446 if(read_cb(buffer, 1, len, handle) != len)
2447 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2448 block->height = unpack_uint32_(buffer, len);
2449
2450 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN % 8 == 0);
2451 len = FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN / 8;
2452 if(read_cb(buffer, 1, len, handle) != len)
2453 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2454 block->depth = unpack_uint32_(buffer, len);
2455
2456 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_COLORS_LEN % 8 == 0);
2457 len = FLAC__STREAM_METADATA_PICTURE_COLORS_LEN / 8;
2458 if(read_cb(buffer, 1, len, handle) != len)
2459 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2460 block->colors = unpack_uint32_(buffer, len);
2461
2462 /* for convenience we use read_metadata_block_data_picture_cstring_cb_() even though it adds an extra terminating NUL we don't use */
2463 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)
2464 return status;
2465
2466 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2467 }
2468
read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__StreamMetadata_Unknown * block,unsigned block_length)2469 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, unsigned block_length)
2470 {
2471 if(block_length == 0) {
2472 block->data = 0;
2473 }
2474 else {
2475 if(0 == (block->data = (FLAC__byte*)malloc(block_length)))
2476 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2477
2478 if(read_cb(block->data, 1, block_length, handle) != block_length)
2479 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2480 }
2481
2482 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2483 }
2484
write_metadata_block_header_(FILE * file,FLAC__Metadata_SimpleIteratorStatus * status,const FLAC__StreamMetadata * block)2485 FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
2486 {
2487 FLAC__ASSERT(0 != file);
2488 FLAC__ASSERT(0 != status);
2489
2490 if(!write_metadata_block_header_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) {
2491 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2492 return false;
2493 }
2494
2495 return true;
2496 }
2497
write_metadata_block_data_(FILE * file,FLAC__Metadata_SimpleIteratorStatus * status,const FLAC__StreamMetadata * block)2498 FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
2499 {
2500 FLAC__ASSERT(0 != file);
2501 FLAC__ASSERT(0 != status);
2502
2503 if (write_metadata_block_data_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) {
2504 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2505 return true;
2506 }
2507 else {
2508 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2509 return false;
2510 }
2511 }
2512
write_metadata_block_header_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata * block)2513 FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block)
2514 {
2515 FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH];
2516
2517 FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
2518
2519 buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type;
2520 pack_uint32_(block->length, buffer + 1, 3);
2521
2522 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH)
2523 return false;
2524
2525 return true;
2526 }
2527
write_metadata_block_data_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata * block)2528 FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block)
2529 {
2530 FLAC__ASSERT(0 != block);
2531
2532 switch(block->type) {
2533 case FLAC__METADATA_TYPE_STREAMINFO:
2534 return write_metadata_block_data_streaminfo_cb_(handle, write_cb, &block->data.stream_info);
2535 case FLAC__METADATA_TYPE_PADDING:
2536 return write_metadata_block_data_padding_cb_(handle, write_cb, &block->data.padding, block->length);
2537 case FLAC__METADATA_TYPE_APPLICATION:
2538 return write_metadata_block_data_application_cb_(handle, write_cb, &block->data.application, block->length);
2539 case FLAC__METADATA_TYPE_SEEKTABLE:
2540 return write_metadata_block_data_seektable_cb_(handle, write_cb, &block->data.seek_table);
2541 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
2542 return write_metadata_block_data_vorbis_comment_cb_(handle, write_cb, &block->data.vorbis_comment);
2543 case FLAC__METADATA_TYPE_CUESHEET:
2544 return write_metadata_block_data_cuesheet_cb_(handle, write_cb, &block->data.cue_sheet);
2545 case FLAC__METADATA_TYPE_PICTURE:
2546 return write_metadata_block_data_picture_cb_(handle, write_cb, &block->data.picture);
2547 default:
2548 return write_metadata_block_data_unknown_cb_(handle, write_cb, &block->data.unknown, block->length);
2549 }
2550 }
2551
write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_StreamInfo * block)2552 FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block)
2553 {
2554 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH];
2555 const unsigned channels1 = block->channels - 1;
2556 const unsigned bps1 = block->bits_per_sample - 1;
2557
2558 /* we are using hardcoded numbers for simplicity but we should
2559 * probably eventually write a bit-level packer and use the
2560 * _STREAMINFO_ constants.
2561 */
2562 pack_uint32_(block->min_blocksize, buffer, 2);
2563 pack_uint32_(block->max_blocksize, buffer+2, 2);
2564 pack_uint32_(block->min_framesize, buffer+4, 3);
2565 pack_uint32_(block->max_framesize, buffer+7, 3);
2566 buffer[10] = (block->sample_rate >> 12) & 0xff;
2567 buffer[11] = (block->sample_rate >> 4) & 0xff;
2568 buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4);
2569 buffer[13] = (FLAC__byte)(((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f));
2570 pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4);
2571 memcpy(buffer+18, block->md5sum, 16);
2572
2573 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
2574 return false;
2575
2576 return true;
2577 }
2578
write_metadata_block_data_padding_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_Padding * block,unsigned block_length)2579 FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, unsigned block_length)
2580 {
2581 unsigned i, n = block_length;
2582 FLAC__byte buffer[1024];
2583
2584 (void)block;
2585
2586 memset(buffer, 0, 1024);
2587
2588 for(i = 0; i < n/1024; i++)
2589 if(write_cb(buffer, 1, 1024, handle) != 1024)
2590 return false;
2591
2592 n %= 1024;
2593
2594 if(write_cb(buffer, 1, n, handle) != n)
2595 return false;
2596
2597 return true;
2598 }
2599
write_metadata_block_data_application_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_Application * block,unsigned block_length)2600 FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, unsigned block_length)
2601 {
2602 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
2603
2604 if(write_cb(block->id, 1, id_bytes, handle) != id_bytes)
2605 return false;
2606
2607 block_length -= id_bytes;
2608
2609 if(write_cb(block->data, 1, block_length, handle) != block_length)
2610 return false;
2611
2612 return true;
2613 }
2614
write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_SeekTable * block)2615 FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block)
2616 {
2617 unsigned i;
2618 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
2619
2620 for(i = 0; i < block->num_points; i++) {
2621 /* some MAGIC NUMBERs here */
2622 pack_uint64_(block->points[i].sample_number, buffer, 8);
2623 pack_uint64_(block->points[i].stream_offset, buffer+8, 8);
2624 pack_uint32_(block->points[i].frame_samples, buffer+16, 2);
2625 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
2626 return false;
2627 }
2628
2629 return true;
2630 }
2631
write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_VorbisComment * block)2632 FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block)
2633 {
2634 unsigned i;
2635 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
2636 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
2637 FLAC__byte buffer[4]; /* magic number is asserted below */
2638
2639 FLAC__ASSERT(max(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8 == sizeof(buffer));
2640
2641 pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len);
2642 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2643 return false;
2644 if(write_cb(block->vendor_string.entry, 1, block->vendor_string.length, handle) != block->vendor_string.length)
2645 return false;
2646
2647 pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len);
2648 if(write_cb(buffer, 1, num_comments_len, handle) != num_comments_len)
2649 return false;
2650
2651 for(i = 0; i < block->num_comments; i++) {
2652 pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len);
2653 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2654 return false;
2655 if(write_cb(block->comments[i].entry, 1, block->comments[i].length, handle) != block->comments[i].length)
2656 return false;
2657 }
2658
2659 return true;
2660 }
2661
write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_CueSheet * block)2662 FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block)
2663 {
2664 unsigned i, j, len;
2665 FLAC__byte buffer[1024]; /* asserted below that this is big enough */
2666
2667 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
2668 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN/8);
2669 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);
2670 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
2671
2672 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
2673 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
2674 if(write_cb(block->media_catalog_number, 1, len, handle) != len)
2675 return false;
2676
2677 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
2678 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
2679 pack_uint64_(block->lead_in, buffer, len);
2680 if(write_cb(buffer, 1, len, handle) != len)
2681 return false;
2682
2683 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
2684 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
2685 memset(buffer, 0, len);
2686 if(block->is_cd)
2687 buffer[0] |= 0x80;
2688 if(write_cb(buffer, 1, len, handle) != len)
2689 return false;
2690
2691 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
2692 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
2693 pack_uint32_(block->num_tracks, buffer, len);
2694 if(write_cb(buffer, 1, len, handle) != len)
2695 return false;
2696
2697 for(i = 0; i < block->num_tracks; i++) {
2698 FLAC__StreamMetadata_CueSheet_Track *track = block->tracks + i;
2699
2700 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
2701 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
2702 pack_uint64_(track->offset, buffer, len);
2703 if(write_cb(buffer, 1, len, handle) != len)
2704 return false;
2705
2706 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
2707 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
2708 pack_uint32_(track->number, buffer, len);
2709 if(write_cb(buffer, 1, len, handle) != len)
2710 return false;
2711
2712 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
2713 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
2714 if(write_cb(track->isrc, 1, len, handle) != len)
2715 return false;
2716
2717 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);
2718 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
2719 memset(buffer, 0, len);
2720 buffer[0] = (track->type << 7) | (track->pre_emphasis << 6);
2721 if(write_cb(buffer, 1, len, handle) != len)
2722 return false;
2723
2724 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
2725 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
2726 pack_uint32_(track->num_indices, buffer, len);
2727 if(write_cb(buffer, 1, len, handle) != len)
2728 return false;
2729
2730 for(j = 0; j < track->num_indices; j++) {
2731 FLAC__StreamMetadata_CueSheet_Index *index = track->indices + j;
2732
2733 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
2734 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
2735 pack_uint64_(index->offset, buffer, len);
2736 if(write_cb(buffer, 1, len, handle) != len)
2737 return false;
2738
2739 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
2740 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
2741 pack_uint32_(index->number, buffer, len);
2742 if(write_cb(buffer, 1, len, handle) != len)
2743 return false;
2744
2745 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
2746 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
2747 memset(buffer, 0, len);
2748 if(write_cb(buffer, 1, len, handle) != len)
2749 return false;
2750 }
2751 }
2752
2753 return true;
2754 }
2755
write_metadata_block_data_picture_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_Picture * block)2756 FLAC__bool write_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Picture *block)
2757 {
2758 unsigned len;
2759 size_t slen;
2760 FLAC__byte buffer[4]; /* magic number is asserted below */
2761
2762 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_TYPE_LEN%8);
2763 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN%8);
2764 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN%8);
2765 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN%8);
2766 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN%8);
2767 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN%8);
2768 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_COLORS_LEN%8);
2769 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN%8);
2770 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8);
2771 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN/8);
2772 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN/8);
2773 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8);
2774 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8);
2775 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8);
2776 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8);
2777 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN/8);
2778
2779 len = FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8;
2780 pack_uint32_(block->type, buffer, len);
2781 if(write_cb(buffer, 1, len, handle) != len)
2782 return false;
2783
2784 len = FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN/8;
2785 slen = strlen(block->mime_type);
2786 pack_uint32_(slen, buffer, len);
2787 if(write_cb(buffer, 1, len, handle) != len)
2788 return false;
2789 if(write_cb(block->mime_type, 1, slen, handle) != slen)
2790 return false;
2791
2792 len = FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN/8;
2793 slen = strlen((const char *)block->description);
2794 pack_uint32_(slen, buffer, len);
2795 if(write_cb(buffer, 1, len, handle) != len)
2796 return false;
2797 if(write_cb(block->description, 1, slen, handle) != slen)
2798 return false;
2799
2800 len = FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8;
2801 pack_uint32_(block->width, buffer, len);
2802 if(write_cb(buffer, 1, len, handle) != len)
2803 return false;
2804
2805 len = FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8;
2806 pack_uint32_(block->height, buffer, len);
2807 if(write_cb(buffer, 1, len, handle) != len)
2808 return false;
2809
2810 len = FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8;
2811 pack_uint32_(block->depth, buffer, len);
2812 if(write_cb(buffer, 1, len, handle) != len)
2813 return false;
2814
2815 len = FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8;
2816 pack_uint32_(block->colors, buffer, len);
2817 if(write_cb(buffer, 1, len, handle) != len)
2818 return false;
2819
2820 len = FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN/8;
2821 pack_uint32_(block->data_length, buffer, len);
2822 if(write_cb(buffer, 1, len, handle) != len)
2823 return false;
2824 if(write_cb(block->data, 1, block->data_length, handle) != block->data_length)
2825 return false;
2826
2827 return true;
2828 }
2829
write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Write write_cb,const FLAC__StreamMetadata_Unknown * block,unsigned block_length)2830 FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, unsigned block_length)
2831 {
2832 if(write_cb(block->data, 1, block_length, handle) != block_length)
2833 return false;
2834
2835 return true;
2836 }
2837
write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator * iterator,const FLAC__StreamMetadata * block)2838 FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block)
2839 {
2840 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2841 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2842 return false;
2843 }
2844
2845 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
2846 return false;
2847
2848 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
2849 return false;
2850
2851 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2852 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2853 return false;
2854 }
2855
2856 return read_metadata_block_header_(iterator);
2857 }
2858
write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator * iterator,FLAC__StreamMetadata * block,unsigned padding_length,FLAC__bool padding_is_last)2859 FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last)
2860 {
2861 FLAC__StreamMetadata *padding;
2862
2863 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2864 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2865 return false;
2866 }
2867
2868 block->is_last = false;
2869
2870 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
2871 return false;
2872
2873 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
2874 return false;
2875
2876 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)))
2877 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2878
2879 padding->is_last = padding_is_last;
2880 padding->length = padding_length;
2881
2882 if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) {
2883 FLAC__metadata_object_delete(padding);
2884 return false;
2885 }
2886
2887 if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) {
2888 FLAC__metadata_object_delete(padding);
2889 return false;
2890 }
2891
2892 FLAC__metadata_object_delete(padding);
2893
2894 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2895 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2896 return false;
2897 }
2898
2899 return read_metadata_block_header_(iterator);
2900 }
2901
rewrite_whole_file_(FLAC__Metadata_SimpleIterator * iterator,FLAC__StreamMetadata * block,FLAC__bool append)2902 FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append)
2903 {
2904 FILE *tempfile;
2905 char *tempfilename;
2906 int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */
2907 off_t fixup_is_last_flag_offset = -1;
2908
2909 FLAC__ASSERT(0 != block || append == false);
2910
2911 if(iterator->is_last) {
2912 if(append) {
2913 fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */
2914 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2915 }
2916 else if(0 == block) {
2917 simple_iterator_push_(iterator);
2918 if(!FLAC__metadata_simple_iterator_prev(iterator)) {
2919 (void)simple_iterator_pop_(iterator);
2920 return false;
2921 }
2922 fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */
2923 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2924 if(!simple_iterator_pop_(iterator))
2925 return false;
2926 }
2927 }
2928
2929 if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append))
2930 return false;
2931
2932 if(0 != block) {
2933 if(!write_metadata_block_header_(tempfile, &iterator->status, block)) {
2934 cleanup_tempfile_(&tempfile, &tempfilename);
2935 return false;
2936 }
2937
2938 if(!write_metadata_block_data_(tempfile, &iterator->status, block)) {
2939 cleanup_tempfile_(&tempfile, &tempfilename);
2940 return false;
2941 }
2942 }
2943
2944 if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0))
2945 return false;
2946
2947 if(append)
2948 return FLAC__metadata_simple_iterator_next(iterator);
2949
2950 return true;
2951 }
2952
simple_iterator_push_(FLAC__Metadata_SimpleIterator * iterator)2953 void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator)
2954 {
2955 FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH);
2956 iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth];
2957 iterator->depth++;
2958 }
2959
simple_iterator_pop_(FLAC__Metadata_SimpleIterator * iterator)2960 FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator)
2961 {
2962 FLAC__ASSERT(iterator->depth > 0);
2963 iterator->depth--;
2964 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2965 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2966 return false;
2967 }
2968
2969 return read_metadata_block_header_(iterator);
2970 }
2971
2972 /* return meanings:
2973 * 0: ok
2974 * 1: read error
2975 * 2: seek error
2976 * 3: not a FLAC file
2977 */
seek_to_first_metadata_block_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__IOCallback_Seek seek_cb)2978 unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb)
2979 {
2980 FLAC__byte buffer[4];
2981 size_t n;
2982 unsigned i;
2983
2984 FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == sizeof(buffer));
2985
2986 /* skip any id3v2 tag */
2987 errno = 0;
2988 n = read_cb(buffer, 1, 4, handle);
2989 if(errno)
2990 return 1;
2991 else if(n != 4)
2992 return 3;
2993 else if(0 == memcmp(buffer, "ID3", 3)) {
2994 unsigned tag_length = 0;
2995
2996 /* skip to the tag length */
2997 if(seek_cb(handle, 2, SEEK_CUR) < 0)
2998 return 2;
2999
3000 /* read the length */
3001 for(i = 0; i < 4; i++) {
3002 if(read_cb(buffer, 1, 1, handle) < 1 || buffer[0] & 0x80)
3003 return 1;
3004 tag_length <<= 7;
3005 tag_length |= (buffer[0] & 0x7f);
3006 }
3007
3008 /* skip the rest of the tag */
3009 if(seek_cb(handle, tag_length, SEEK_CUR) < 0)
3010 return 2;
3011
3012 /* read the stream sync code */
3013 errno = 0;
3014 n = read_cb(buffer, 1, 4, handle);
3015 if(errno)
3016 return 1;
3017 else if(n != 4)
3018 return 3;
3019 }
3020
3021 /* check for the fLaC signature */
3022 if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH))
3023 return 0;
3024 else
3025 return 3;
3026 }
3027
seek_to_first_metadata_block_(FILE * f)3028 unsigned seek_to_first_metadata_block_(FILE *f)
3029 {
3030 return seek_to_first_metadata_block_cb_((FLAC__IOHandle)f, (FLAC__IOCallback_Read)fread, fseek_wrapper_);
3031 }
3032
simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator * iterator,FILE ** tempfile,char ** tempfilename,FLAC__bool append)3033 FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append)
3034 {
3035 const off_t offset_end = append? iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length : iterator->offset[iterator->depth];
3036
3037 if(0 != fseeko(iterator->file, 0, SEEK_SET)) {
3038 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
3039 return false;
3040 }
3041 if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) {
3042 cleanup_tempfile_(tempfile, tempfilename);
3043 return false;
3044 }
3045 if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) {
3046 cleanup_tempfile_(tempfile, tempfilename);
3047 return false;
3048 }
3049
3050 return true;
3051 }
3052
simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator * iterator,FILE ** tempfile,char ** tempfilename,int fixup_is_last_code,off_t fixup_is_last_flag_offset,FLAC__bool backup)3053 FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, off_t fixup_is_last_flag_offset, FLAC__bool backup)
3054 {
3055 off_t save_offset = iterator->offset[iterator->depth];
3056 FLAC__ASSERT(0 != *tempfile);
3057
3058 if(0 != fseeko(iterator->file, save_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length, SEEK_SET)) {
3059 cleanup_tempfile_(tempfile, tempfilename);
3060 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
3061 return false;
3062 }
3063 if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) {
3064 cleanup_tempfile_(tempfile, tempfilename);
3065 return false;
3066 }
3067
3068 if(fixup_is_last_code != 0) {
3069 /*
3070 * if code == 1, it means a block was appended to the end so
3071 * we have to clear the is_last flag of the previous block
3072 * if code == -1, it means the last block was deleted so
3073 * we have to set the is_last flag of the previous block
3074 */
3075 /* MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */
3076 FLAC__byte x;
3077 if(0 != fseeko(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
3078 cleanup_tempfile_(tempfile, tempfilename);
3079 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
3080 return false;
3081 }
3082 if(fread(&x, 1, 1, *tempfile) != 1) {
3083 cleanup_tempfile_(tempfile, tempfilename);
3084 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3085 return false;
3086 }
3087 if(fixup_is_last_code > 0) {
3088 FLAC__ASSERT(x & 0x80);
3089 x &= 0x7f;
3090 }
3091 else {
3092 FLAC__ASSERT(!(x & 0x80));
3093 x |= 0x80;
3094 }
3095 if(0 != fseeko(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
3096 cleanup_tempfile_(tempfile, tempfilename);
3097 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
3098 return false;
3099 }
3100 if(local__fwrite(&x, 1, 1, *tempfile) != 1) {
3101 cleanup_tempfile_(tempfile, tempfilename);
3102 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3103 return false;
3104 }
3105 }
3106
3107 (void)fclose(iterator->file);
3108
3109 if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status))
3110 return false;
3111
3112 if(iterator->has_stats)
3113 set_file_stats_(iterator->filename, &iterator->stats);
3114
3115 if(!simple_iterator_prime_input_(iterator, !iterator->is_writable))
3116 return false;
3117 if(backup) {
3118 while(iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length < save_offset)
3119 if(!FLAC__metadata_simple_iterator_next(iterator))
3120 return false;
3121 return true;
3122 }
3123 else {
3124 /* move the iterator to it's original block faster by faking a push, then doing a pop_ */
3125 FLAC__ASSERT(iterator->depth == 0);
3126 iterator->offset[0] = save_offset;
3127 iterator->depth++;
3128 return simple_iterator_pop_(iterator);
3129 }
3130 }
3131
copy_n_bytes_from_file_(FILE * file,FILE * tempfile,off_t bytes,FLAC__Metadata_SimpleIteratorStatus * status)3132 FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status)
3133 {
3134 FLAC__byte buffer[8192];
3135 size_t n;
3136
3137 FLAC__ASSERT(bytes >= 0);
3138 while(bytes > 0) {
3139 n = min(sizeof(buffer), (size_t)bytes);
3140 if(fread(buffer, 1, n, file) != n) {
3141 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3142 return false;
3143 }
3144 if(local__fwrite(buffer, 1, n, tempfile) != n) {
3145 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3146 return false;
3147 }
3148 bytes -= n;
3149 }
3150
3151 return true;
3152 }
3153
copy_n_bytes_from_file_cb_(FLAC__IOHandle handle,FLAC__IOCallback_Read read_cb,FLAC__IOHandle temp_handle,FLAC__IOCallback_Write temp_write_cb,off_t bytes,FLAC__Metadata_SimpleIteratorStatus * status)3154 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, off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status)
3155 {
3156 FLAC__byte buffer[8192];
3157 size_t n;
3158
3159 FLAC__ASSERT(bytes >= 0);
3160 while(bytes > 0) {
3161 n = min(sizeof(buffer), (size_t)bytes);
3162 if(read_cb(buffer, 1, n, handle) != n) {
3163 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3164 return false;
3165 }
3166 if(temp_write_cb(buffer, 1, n, temp_handle) != n) {
3167 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3168 return false;
3169 }
3170 bytes -= n;
3171 }
3172
3173 return true;
3174 }
3175
copy_remaining_bytes_from_file_(FILE * file,FILE * tempfile,FLAC__Metadata_SimpleIteratorStatus * status)3176 FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status)
3177 {
3178 FLAC__byte buffer[8192];
3179 size_t n;
3180
3181 while(!feof(file)) {
3182 n = fread(buffer, 1, sizeof(buffer), file);
3183 if(n == 0 && !feof(file)) {
3184 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3185 return false;
3186 }
3187 if(n > 0 && local__fwrite(buffer, 1, n, tempfile) != n) {
3188 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3189 return false;
3190 }
3191 }
3192
3193 return true;
3194 }
3195
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)3196 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)
3197 {
3198 FLAC__byte buffer[8192];
3199 size_t n;
3200
3201 while(!eof_cb(handle)) {
3202 n = read_cb(buffer, 1, sizeof(buffer), handle);
3203 if(n == 0 && !eof_cb(handle)) {
3204 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3205 return false;
3206 }
3207 if(n > 0 && temp_write_cb(buffer, 1, n, temp_handle) != n) {
3208 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3209 return false;
3210 }
3211 }
3212
3213 return true;
3214 }
3215
open_tempfile_(const char * filename,const char * tempfile_path_prefix,FILE ** tempfile,char ** tempfilename,FLAC__Metadata_SimpleIteratorStatus * status)3216 FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
3217 {
3218 static const char *tempfile_suffix = ".metadata_edit";
3219 if(0 == tempfile_path_prefix) {
3220 if(0 == (*tempfilename = (char*)safe_malloc_add_3op_(strlen(filename), /*+*/strlen(tempfile_suffix), /*+*/1))) {
3221 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
3222 return false;
3223 }
3224 strcpy(*tempfilename, filename);
3225 strcat(*tempfilename, tempfile_suffix);
3226 }
3227 else {
3228 const char *p = strrchr(filename, '/');
3229 if(0 == p)
3230 p = filename;
3231 else
3232 p++;
3233
3234 if(0 == (*tempfilename = (char*)safe_malloc_add_4op_(strlen(tempfile_path_prefix), /*+*/strlen(p), /*+*/strlen(tempfile_suffix), /*+*/2))) {
3235 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
3236 return false;
3237 }
3238 strcpy(*tempfilename, tempfile_path_prefix);
3239 strcat(*tempfilename, "/");
3240 strcat(*tempfilename, p);
3241 strcat(*tempfilename, tempfile_suffix);
3242 }
3243
3244 if(0 == (*tempfile = fopen(*tempfilename, "w+b"))) {
3245 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
3246 return false;
3247 }
3248
3249 return true;
3250 }
3251
transport_tempfile_(const char * filename,FILE ** tempfile,char ** tempfilename,FLAC__Metadata_SimpleIteratorStatus * status)3252 FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
3253 {
3254 FLAC__ASSERT(0 != filename);
3255 FLAC__ASSERT(0 != tempfile);
3256 FLAC__ASSERT(0 != *tempfile);
3257 FLAC__ASSERT(0 != tempfilename);
3258 FLAC__ASSERT(0 != *tempfilename);
3259 FLAC__ASSERT(0 != status);
3260
3261 (void)fclose(*tempfile);
3262 *tempfile = 0;
3263
3264 #if defined _MSC_VER || defined __BORLANDC__ || defined __MINGW32__ || defined __EMX__
3265 /* on some flavors of windows, rename() will fail if the destination already exists */
3266 if(unlink(filename) < 0) {
3267 cleanup_tempfile_(tempfile, tempfilename);
3268 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR;
3269 return false;
3270 }
3271 #endif
3272
3273 /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just rename(): */
3274 if(0 != rename(*tempfilename, filename)) {
3275 cleanup_tempfile_(tempfile, tempfilename);
3276 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR;
3277 return false;
3278 }
3279
3280 cleanup_tempfile_(tempfile, tempfilename);
3281
3282 return true;
3283 }
3284
cleanup_tempfile_(FILE ** tempfile,char ** tempfilename)3285 void cleanup_tempfile_(FILE **tempfile, char **tempfilename)
3286 {
3287 if(0 != *tempfile) {
3288 (void)fclose(*tempfile);
3289 *tempfile = 0;
3290 }
3291
3292 if(0 != *tempfilename) {
3293 (void)unlink(*tempfilename);
3294 free(*tempfilename);
3295 *tempfilename = 0;
3296 }
3297 }
3298
get_file_stats_(const char * filename,struct stat * stats)3299 FLAC__bool get_file_stats_(const char *filename, struct stat *stats)
3300 {
3301 FLAC__ASSERT(0 != filename);
3302 FLAC__ASSERT(0 != stats);
3303 return (0 == stat(filename, stats));
3304 }
3305
set_file_stats_(const char * filename,struct stat * stats)3306 void set_file_stats_(const char *filename, struct stat *stats)
3307 {
3308 struct utimbuf srctime;
3309
3310 FLAC__ASSERT(0 != filename);
3311 FLAC__ASSERT(0 != stats);
3312
3313 srctime.actime = stats->st_atime;
3314 srctime.modtime = stats->st_mtime;
3315 (void)chmod(filename, stats->st_mode);
3316 (void)utime(filename, &srctime);
3317 #if !defined _MSC_VER && !defined __BORLANDC__ && !defined __MINGW32__ && !defined __EMX__
3318 (void)chown(filename, stats->st_uid, -1);
3319 (void)chown(filename, -1, stats->st_gid);
3320 #endif
3321 }
3322
fseek_wrapper_(FLAC__IOHandle handle,FLAC__int64 offset,int whence)3323 int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence)
3324 {
3325 return fseeko((FILE*)handle, (off_t)offset, whence);
3326 }
3327
ftell_wrapper_(FLAC__IOHandle handle)3328 FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle)
3329 {
3330 return ftello((FILE*)handle);
3331 }
3332
get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status)3333 FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status)
3334 {
3335 switch(status) {
3336 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK:
3337 return FLAC__METADATA_CHAIN_STATUS_OK;
3338 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT:
3339 return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT;
3340 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE:
3341 return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
3342 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE:
3343 return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
3344 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE:
3345 return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE;
3346 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA:
3347 return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA;
3348 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR:
3349 return FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
3350 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR:
3351 return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
3352 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR:
3353 return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
3354 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR:
3355 return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR;
3356 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR:
3357 return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR;
3358 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR:
3359 return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
3360 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR:
3361 default:
3362 return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;
3363 }
3364 }
3365