1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2001,2002,2003,2004,2005 Josh Coalson
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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.
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.
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.
37 #if defined _MSC_VER || defined __MINGW32__
38 #include <sys/utime.h> /* for utime() */
39 #include <io.h> /* for chmod() */
41 #include <sys/types.h> /* some flavors of BSD (like OS X) require this to get time_t */
42 #include <utime.h> /* for utime() */
43 #include <unistd.h> /* for chown(), unlink() */
45 #include <sys/stat.h> /* for stat(), maybe chmod() */
47 #include "private/metadata.h"
49 #include "FLAC/assert.h"
50 #include "FLAC/file_decoder.h"
55 #define max(a,b) ((a)>(b)?(a):(b))
59 #define min(a,b) ((a)<(b)?(a):(b))
62 /****************************************************************************
64 * Local function declarations
66 ***************************************************************************/
68 static void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
69 static void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
70 static void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes);
71 static FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes);
72 static FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes);
73 static FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes);
75 static FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator);
76 static FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block);
77 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);
78 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);
79 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block);
80 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);
81 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);
82 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);
83 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);
84 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment *block);
85 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track);
86 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block);
87 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, unsigned block_length);
89 static FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
90 static FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
91 static FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block);
92 static FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block);
93 static FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block);
94 static FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, unsigned block_length);
95 static FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, unsigned block_length);
96 static FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block);
97 static FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block);
98 static FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block);
99 static FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, unsigned block_length);
101 static FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block);
102 static FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last);
103 static FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append);
105 static void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator);
106 static FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator);
108 static unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb);
109 static unsigned seek_to_first_metadata_block_(FILE *f);
111 static FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append);
112 static FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, long fixup_is_last_flag_offset, FLAC__bool backup);
114 static FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, unsigned bytes/*@@@ 4G limit*/, FLAC__Metadata_SimpleIteratorStatus *status);
115 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, unsigned bytes/*@@@ 4G limit*/, FLAC__Metadata_SimpleIteratorStatus *status);
116 static FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status);
117 static FLAC__bool copy_remaining_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Eof eof_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__Metadata_SimpleIteratorStatus *status);
119 static FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
120 static FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
121 static void cleanup_tempfile_(FILE **tempfile, char **tempfilename);
123 static FLAC__bool get_file_stats_(const char *filename, struct stat *stats);
124 static void set_file_stats_(const char *filename, struct stat *stats);
126 static int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence);
127 static FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle);
129 static FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status);
132 #ifdef FLAC__VALGRIND_TESTING
133 static size_t local__fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
135 size_t ret = fwrite(ptr, size, nmemb, stream);
141 #define local__fwrite fwrite
144 /****************************************************************************
146 * Level 0 implementation
148 ***************************************************************************/
150 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
151 static void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
152 static void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
155 FLAC__bool got_error;
156 FLAC__bool got_object;
157 FLAC__StreamMetadata *object;
158 } level0_client_data;
160 FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo)
162 level0_client_data cd;
163 FLAC__FileDecoder *decoder;
165 FLAC__ASSERT(0 != filename);
166 FLAC__ASSERT(0 != streaminfo);
168 decoder = FLAC__file_decoder_new();
173 cd.got_error = false;
174 cd.got_object = false;
177 FLAC__file_decoder_set_md5_checking(decoder, false);
178 FLAC__file_decoder_set_filename(decoder, filename);
179 FLAC__file_decoder_set_metadata_ignore_all(decoder);
180 FLAC__file_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO);
181 FLAC__file_decoder_set_write_callback(decoder, write_callback_);
182 FLAC__file_decoder_set_metadata_callback(decoder, metadata_callback_);
183 FLAC__file_decoder_set_error_callback(decoder, error_callback_);
184 FLAC__file_decoder_set_client_data(decoder, &cd);
186 if(FLAC__file_decoder_init(decoder) != FLAC__FILE_DECODER_OK || cd.got_error) {
187 FLAC__file_decoder_finish(decoder);
188 FLAC__file_decoder_delete(decoder);
192 if(!FLAC__file_decoder_process_until_end_of_metadata(decoder) || cd.got_error) {
193 FLAC__file_decoder_finish(decoder);
194 FLAC__file_decoder_delete(decoder);
196 FLAC__metadata_object_delete(cd.object);
200 FLAC__file_decoder_finish(decoder);
201 FLAC__file_decoder_delete(decoder);
204 /* can just copy the contents since STREAMINFO has no internal structure */
205 *streaminfo = *(cd.object);
209 FLAC__metadata_object_delete(cd.object);
211 return cd.got_object;
214 FLAC_API FLAC__bool FLAC__metadata_get_tags(const char *filename, FLAC__StreamMetadata **tags)
216 level0_client_data cd;
217 FLAC__FileDecoder *decoder;
219 FLAC__ASSERT(0 != filename);
220 FLAC__ASSERT(0 != tags);
222 decoder = FLAC__file_decoder_new();
229 cd.got_error = false;
230 cd.got_object = false;
233 FLAC__file_decoder_set_md5_checking(decoder, false);
234 FLAC__file_decoder_set_filename(decoder, filename);
235 FLAC__file_decoder_set_metadata_ignore_all(decoder);
236 FLAC__file_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_VORBIS_COMMENT);
237 FLAC__file_decoder_set_write_callback(decoder, write_callback_);
238 FLAC__file_decoder_set_metadata_callback(decoder, metadata_callback_);
239 FLAC__file_decoder_set_error_callback(decoder, error_callback_);
240 FLAC__file_decoder_set_client_data(decoder, &cd);
242 if(FLAC__file_decoder_init(decoder) != FLAC__FILE_DECODER_OK || cd.got_error) {
243 FLAC__file_decoder_finish(decoder);
244 FLAC__file_decoder_delete(decoder);
248 if(!FLAC__file_decoder_process_until_end_of_metadata(decoder) || cd.got_error) {
249 FLAC__file_decoder_finish(decoder);
250 FLAC__file_decoder_delete(decoder);
252 FLAC__metadata_object_delete(cd.object);
256 FLAC__file_decoder_finish(decoder);
257 FLAC__file_decoder_delete(decoder);
262 return cd.got_object;
265 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
267 (void)decoder, (void)frame, (void)buffer, (void)client_data;
269 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
272 void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
274 level0_client_data *cd = (level0_client_data *)client_data;
278 * we assume we only get here when the one metadata block we were
279 * looking for was passed to us
281 if(!cd->got_object) {
282 if(0 == (cd->object = FLAC__metadata_object_clone(metadata)))
283 cd->got_error = true;
285 cd->got_object = true;
289 void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
291 level0_client_data *cd = (level0_client_data *)client_data;
294 if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
295 cd->got_error = true;
299 /****************************************************************************
301 * Level 1 implementation
303 ***************************************************************************/
305 #define SIMPLE_ITERATOR_MAX_PUSH_DEPTH (1+4)
306 /* 1 for initial offset, +4 for our own personal use */
308 struct FLAC__Metadata_SimpleIterator {
310 char *filename, *tempfile_path_prefix;
312 FLAC__bool has_stats;
313 FLAC__bool is_writable;
314 FLAC__Metadata_SimpleIteratorStatus status;
315 /*@@@ 2G limits here because of the offset type: */
316 long offset[SIMPLE_ITERATOR_MAX_PUSH_DEPTH];
317 long first_offset; /* this is the offset to the STREAMINFO block */
319 /* this is the metadata block header of the current block we are pointing to: */
321 FLAC__MetadataType type;
325 FLAC_API const char * const FLAC__Metadata_SimpleIteratorStatusString[] = {
326 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK",
327 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT",
328 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE",
329 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE",
330 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE",
331 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA",
332 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR",
333 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR",
334 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR",
335 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR",
336 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR",
337 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR",
338 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR"
342 FLAC_API FLAC__Metadata_SimpleIterator *FLAC__metadata_simple_iterator_new()
344 FLAC__Metadata_SimpleIterator *iterator = (FLAC__Metadata_SimpleIterator*)calloc(1, sizeof(FLAC__Metadata_SimpleIterator));
348 iterator->filename = 0;
349 iterator->tempfile_path_prefix = 0;
350 iterator->has_stats = false;
351 iterator->is_writable = false;
352 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
353 iterator->first_offset = iterator->offset[0] = -1;
360 static void simple_iterator_free_guts_(FLAC__Metadata_SimpleIterator *iterator)
362 FLAC__ASSERT(0 != iterator);
364 if(0 != iterator->file) {
365 fclose(iterator->file);
367 if(iterator->has_stats)
368 set_file_stats_(iterator->filename, &iterator->stats);
370 if(0 != iterator->filename) {
371 free(iterator->filename);
372 iterator->filename = 0;
374 if(0 != iterator->tempfile_path_prefix) {
375 free(iterator->tempfile_path_prefix);
376 iterator->tempfile_path_prefix = 0;
380 FLAC_API void FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator *iterator)
382 FLAC__ASSERT(0 != iterator);
384 simple_iterator_free_guts_(iterator);
388 FLAC_API FLAC__Metadata_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator *iterator)
390 FLAC__Metadata_SimpleIteratorStatus status;
392 FLAC__ASSERT(0 != iterator);
394 status = iterator->status;
395 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
399 static FLAC__bool simple_iterator_prime_input_(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool read_only)
403 FLAC__ASSERT(0 != iterator);
405 if(read_only || 0 == (iterator->file = fopen(iterator->filename, "r+b"))) {
406 iterator->is_writable = false;
407 if(read_only || errno == EACCES) {
408 if(0 == (iterator->file = fopen(iterator->filename, "rb"))) {
409 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
414 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
419 iterator->is_writable = true;
422 ret = seek_to_first_metadata_block_(iterator->file);
426 iterator->first_offset = iterator->offset[iterator->depth] = ftell(iterator->file);
427 return read_metadata_block_header_(iterator);
429 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
432 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
435 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE;
444 @@@ If we decide to finish implementing this, put this comment back in metadata.h
446 * The 'tempfile_path_prefix' allows you to specify a directory where
447 * tempfiles should go. Remember that if your metadata edits cause the
448 * FLAC file to grow, the entire file will have to be rewritten. If
449 * 'tempfile_path_prefix' is NULL, the temp file will be written in the
450 * same directory as the original FLAC file. This makes replacing the
451 * original with the tempfile fast but requires extra space in the same
452 * partition for the tempfile. If space is a problem, you can pass a
453 * directory name belonging to a different partition in
454 * 'tempfile_path_prefix'. Note that you should use the forward slash
455 * '/' as the directory separator. A trailing slash is not needed; it
456 * will be added automatically.
458 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats, const char *tempfile_path_prefix);
461 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)
463 const char *tempfile_path_prefix = 0; /*@@@ search for comments near 'rename(...)' for what it will take to finish implementing this */
465 FLAC__ASSERT(0 != iterator);
466 FLAC__ASSERT(0 != filename);
468 simple_iterator_free_guts_(iterator);
470 if(!read_only && preserve_file_stats)
471 iterator->has_stats = get_file_stats_(filename, &iterator->stats);
473 if(0 == (iterator->filename = strdup(filename))) {
474 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
477 if(0 != tempfile_path_prefix && 0 == (iterator->tempfile_path_prefix = strdup(tempfile_path_prefix))) {
478 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
482 return simple_iterator_prime_input_(iterator, read_only);
485 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator *iterator)
487 FLAC__ASSERT(0 != iterator);
488 FLAC__ASSERT(0 != iterator->file);
490 return iterator->is_writable;
493 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator *iterator)
495 FLAC__ASSERT(0 != iterator);
496 FLAC__ASSERT(0 != iterator->file);
498 if(iterator->is_last)
501 if(0 != fseek(iterator->file, iterator->length, SEEK_CUR)) {
502 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
506 iterator->offset[iterator->depth] = ftell(iterator->file);
508 return read_metadata_block_header_(iterator);
511 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator *iterator)
515 FLAC__ASSERT(0 != iterator);
516 FLAC__ASSERT(0 != iterator->file);
518 if(iterator->offset[iterator->depth] == iterator->first_offset)
521 if(0 != fseek(iterator->file, iterator->first_offset, SEEK_SET)) {
522 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
525 this_offset = iterator->first_offset;
526 if(!read_metadata_block_header_(iterator))
529 /* we ignore any error from ftell() and catch it in fseek() */
530 while(ftell(iterator->file) + (long)iterator->length < iterator->offset[iterator->depth]) {
531 if(0 != fseek(iterator->file, iterator->length, SEEK_CUR)) {
532 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
535 this_offset = ftell(iterator->file);
536 if(!read_metadata_block_header_(iterator))
540 iterator->offset[iterator->depth] = this_offset;
545 FLAC_API FLAC__MetadataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator *iterator)
547 FLAC__ASSERT(0 != iterator);
548 FLAC__ASSERT(0 != iterator->file);
550 return iterator->type;
553 FLAC_API FLAC__StreamMetadata *FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator *iterator)
555 FLAC__StreamMetadata *block = FLAC__metadata_object_new(iterator->type);
557 FLAC__ASSERT(0 != iterator);
558 FLAC__ASSERT(0 != iterator->file);
561 block->is_last = iterator->is_last;
562 block->length = iterator->length;
564 if(!read_metadata_block_data_(iterator, block)) {
565 FLAC__metadata_object_delete(block);
569 /* back up to the beginning of the block data to stay consistent */
570 if(0 != fseek(iterator->file, iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH, SEEK_SET)) {
571 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
572 FLAC__metadata_object_delete(block);
577 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
582 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
584 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth];)
587 FLAC__ASSERT(0 != iterator);
588 FLAC__ASSERT(0 != iterator->file);
589 FLAC__ASSERT(0 != block);
591 if(!iterator->is_writable) {
592 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE;
596 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO || block->type == FLAC__METADATA_TYPE_STREAMINFO) {
597 if(iterator->type != block->type) {
598 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
603 block->is_last = iterator->is_last;
605 if(iterator->length == block->length)
606 return write_metadata_block_stationary_(iterator, block);
607 else if(iterator->length > block->length) {
608 if(use_padding && iterator->length >= FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) {
609 ret = write_metadata_block_stationary_with_padding_(iterator, block, iterator->length - FLAC__STREAM_METADATA_HEADER_LENGTH - block->length, block->is_last);
610 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
611 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
615 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
616 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
617 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
621 else /* iterator->length < block->length */ {
622 unsigned padding_leftover = 0;
623 FLAC__bool padding_is_last = false;
625 /* first see if we can even use padding */
626 if(iterator->is_last) {
630 const unsigned extra_padding_bytes_required = block->length - iterator->length;
631 simple_iterator_push_(iterator);
632 if(!FLAC__metadata_simple_iterator_next(iterator)) {
633 (void)simple_iterator_pop_(iterator);
636 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
640 if(FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length == extra_padding_bytes_required) {
641 padding_leftover = 0;
642 block->is_last = iterator->is_last;
644 else if(iterator->length < extra_padding_bytes_required)
647 padding_leftover = FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length - extra_padding_bytes_required;
648 padding_is_last = iterator->is_last;
649 block->is_last = false;
652 if(!simple_iterator_pop_(iterator))
657 if(padding_leftover == 0) {
658 ret = write_metadata_block_stationary_(iterator, block);
659 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
660 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
664 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
665 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
666 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
667 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
672 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
673 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
674 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
680 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
682 unsigned padding_leftover = 0;
683 FLAC__bool padding_is_last = false;
685 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length;)
688 FLAC__ASSERT(0 != iterator);
689 FLAC__ASSERT(0 != iterator->file);
690 FLAC__ASSERT(0 != block);
692 if(!iterator->is_writable)
695 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) {
696 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
700 block->is_last = iterator->is_last;
703 /* first see if we can even use padding */
704 if(iterator->is_last) {
708 simple_iterator_push_(iterator);
709 if(!FLAC__metadata_simple_iterator_next(iterator)) {
710 (void)simple_iterator_pop_(iterator);
713 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
717 if(iterator->length == block->length) {
718 padding_leftover = 0;
719 block->is_last = iterator->is_last;
721 else if(iterator->length < FLAC__STREAM_METADATA_HEADER_LENGTH + block->length)
724 padding_leftover = iterator->length - block->length;
725 padding_is_last = iterator->is_last;
726 block->is_last = false;
729 if(!simple_iterator_pop_(iterator))
734 /* move to the next block, which is suitable padding */
735 if(!FLAC__metadata_simple_iterator_next(iterator))
737 if(padding_leftover == 0) {
738 ret = write_metadata_block_stationary_(iterator, block);
739 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
740 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
744 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
745 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
746 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
747 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
752 ret = rewrite_whole_file_(iterator, block, /*append=*/true);
753 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
754 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
759 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool use_padding)
761 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth];)
764 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO) {
765 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
770 FLAC__StreamMetadata *padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
772 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
775 padding->length = iterator->length;
776 if(!FLAC__metadata_simple_iterator_set_block(iterator, padding, false)) {
777 FLAC__metadata_object_delete(padding);
780 FLAC__metadata_object_delete(padding);
781 if(!FLAC__metadata_simple_iterator_prev(iterator))
783 FLAC__ASSERT(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length == debug_target_offset);
784 FLAC__ASSERT(ftell(iterator->file) + (long)iterator->length == debug_target_offset);
788 ret = rewrite_whole_file_(iterator, 0, /*append=*/false);
789 FLAC__ASSERT(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length == debug_target_offset);
790 FLAC__ASSERT(ftell(iterator->file) + (long)iterator->length == debug_target_offset);
797 /****************************************************************************
799 * Level 2 implementation
801 ***************************************************************************/
804 typedef struct FLAC__Metadata_Node {
805 FLAC__StreamMetadata *data;
806 struct FLAC__Metadata_Node *prev, *next;
807 } FLAC__Metadata_Node;
809 struct FLAC__Metadata_Chain {
810 char *filename; /* will be NULL if using callbacks */
811 FLAC__Metadata_Node *head;
812 FLAC__Metadata_Node *tail;
814 FLAC__Metadata_ChainStatus status;
815 long first_offset, last_offset; /*@@@ 2G limit */
817 * This is the length of the chain initially read from the FLAC file.
818 * it is used to compare against the current length to decide whether
819 * or not the whole file has to be rewritten.
821 unsigned initial_length; /*@@@ 4G limit */
824 struct FLAC__Metadata_Iterator {
825 FLAC__Metadata_Chain *chain;
826 FLAC__Metadata_Node *current;
829 FLAC_API const char * const FLAC__Metadata_ChainStatusString[] = {
830 "FLAC__METADATA_CHAIN_STATUS_OK",
831 "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT",
832 "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE",
833 "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE",
834 "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE",
835 "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA",
836 "FLAC__METADATA_CHAIN_STATUS_READ_ERROR",
837 "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR",
838 "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR",
839 "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR",
840 "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR",
841 "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR",
842 "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR",
843 "FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS",
844 "FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH",
845 "FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL"
849 static FLAC__Metadata_Node *node_new_()
851 return (FLAC__Metadata_Node*)calloc(1, sizeof(FLAC__Metadata_Node));
854 static void node_delete_(FLAC__Metadata_Node *node)
856 FLAC__ASSERT(0 != node);
858 FLAC__metadata_object_delete(node->data);
862 static void chain_init_(FLAC__Metadata_Chain *chain)
864 FLAC__ASSERT(0 != chain);
867 chain->head = chain->tail = 0;
869 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
870 chain->initial_length = 0;
873 static void chain_clear_(FLAC__Metadata_Chain *chain)
875 FLAC__Metadata_Node *node, *next;
877 FLAC__ASSERT(0 != chain);
879 for(node = chain->head; node; ) {
885 if(0 != chain->filename)
886 free(chain->filename);
891 static void chain_append_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
893 FLAC__ASSERT(0 != chain);
894 FLAC__ASSERT(0 != node);
895 FLAC__ASSERT(0 != node->data);
897 node->next = node->prev = 0;
898 node->data->is_last = true;
900 chain->tail->data->is_last = false;
905 FLAC__ASSERT(0 != chain->tail);
906 chain->tail->next = node;
907 node->prev = chain->tail;
913 static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
915 FLAC__ASSERT(0 != chain);
916 FLAC__ASSERT(0 != node);
918 if(node == chain->head)
919 chain->head = node->next;
921 node->prev->next = node->next;
923 if(node == chain->tail)
924 chain->tail = node->prev;
926 node->next->prev = node->prev;
929 chain->tail->data->is_last = true;
934 static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
936 chain_remove_node_(chain, node);
940 static unsigned chain_calculate_length_(FLAC__Metadata_Chain *chain)
942 const FLAC__Metadata_Node *node;
944 for(node = chain->head; node; node = node->next)
945 length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
949 static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
951 FLAC__ASSERT(0 != node);
952 FLAC__ASSERT(0 != node->data);
953 FLAC__ASSERT(0 != iterator);
954 FLAC__ASSERT(0 != iterator->current);
955 FLAC__ASSERT(0 != iterator->chain);
956 FLAC__ASSERT(0 != iterator->chain->head);
957 FLAC__ASSERT(0 != iterator->chain->tail);
959 node->data->is_last = false;
961 node->prev = iterator->current->prev;
962 node->next = iterator->current;
965 iterator->chain->head = node;
967 node->prev->next = node;
969 iterator->current->prev = node;
971 iterator->chain->nodes++;
974 static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
976 FLAC__ASSERT(0 != node);
977 FLAC__ASSERT(0 != node->data);
978 FLAC__ASSERT(0 != iterator);
979 FLAC__ASSERT(0 != iterator->current);
980 FLAC__ASSERT(0 != iterator->chain);
981 FLAC__ASSERT(0 != iterator->chain->head);
982 FLAC__ASSERT(0 != iterator->chain->tail);
984 iterator->current->data->is_last = false;
986 node->prev = iterator->current;
987 node->next = iterator->current->next;
990 iterator->chain->tail = node;
992 node->next->prev = node;
994 node->prev->next = node;
996 iterator->chain->tail->data->is_last = true;
998 iterator->chain->nodes++;
1001 /* return true iff node and node->next are both padding */
1002 static FLAC__bool chain_merge_adjacent_padding_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
1004 if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) {
1005 const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length;
1006 node->data->length += growth;
1008 chain_delete_node_(chain, node->next);
1015 /* Returns the new length of the chain, or 0 if there was an error. */
1016 /* WATCHOUT: This can get called multiple times before a write, so
1017 * it should still work when this happens.
1019 /* WATCHOUT: Make sure to also update the logic in
1020 * FLAC__metadata_chain_check_if_tempfile_needed() if the logic here changes.
1022 static unsigned chain_prepare_for_write_(FLAC__Metadata_Chain *chain, FLAC__bool use_padding)
1024 unsigned current_length = chain_calculate_length_(chain);
1027 /* if the metadata shrank and the last block is padding, we just extend the last padding block */
1028 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1029 const unsigned delta = chain->initial_length - current_length;
1030 chain->tail->data->length += delta;
1031 current_length += delta;
1032 FLAC__ASSERT(current_length == chain->initial_length);
1034 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */
1035 else if(current_length + FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
1036 FLAC__StreamMetadata *padding;
1037 FLAC__Metadata_Node *node;
1038 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) {
1039 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1042 padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + current_length);
1043 if(0 == (node = node_new_())) {
1044 FLAC__metadata_object_delete(padding);
1045 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1048 node->data = padding;
1049 chain_append_node_(chain, node);
1050 current_length = chain_calculate_length_(chain);
1051 FLAC__ASSERT(current_length == chain->initial_length);
1053 /* 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 */
1054 else if(current_length > chain->initial_length) {
1055 const unsigned delta = current_length - chain->initial_length;
1056 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1057 /* if the delta is exactly the size of the last padding block, remove the padding block */
1058 if(chain->tail->data->length + FLAC__STREAM_METADATA_HEADER_LENGTH == delta) {
1059 chain_delete_node_(chain, chain->tail);
1060 current_length = chain_calculate_length_(chain);
1061 FLAC__ASSERT(current_length == chain->initial_length);
1063 /* if there is at least 'delta' bytes of padding, trim the padding down */
1064 else if(chain->tail->data->length >= delta) {
1065 chain->tail->data->length -= delta;
1066 current_length -= delta;
1067 FLAC__ASSERT(current_length == chain->initial_length);
1073 return current_length;
1076 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)
1078 FLAC__Metadata_Node *node;
1080 FLAC__ASSERT(0 != chain);
1082 /* we assume we're already at the beginning of the file */
1084 switch(seek_to_first_metadata_block_cb_(handle, read_cb, seek_cb)) {
1088 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1091 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1094 chain->status = FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
1102 FLAC__int64 pos = tell_cb(handle);
1104 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1107 chain->first_offset = (long)pos;
1112 FLAC__MetadataType type;
1118 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1122 if(!read_metadata_block_header_cb_(handle, read_cb, &is_last, &type, &length)) {
1123 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1127 node->data = FLAC__metadata_object_new(type);
1128 if(0 == node->data) {
1130 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1134 node->data->is_last = is_last;
1135 node->data->length = length;
1137 chain->status = get_equivalent_status_(read_metadata_block_data_cb_(handle, read_cb, seek_cb, node->data));
1138 if(chain->status != FLAC__METADATA_CHAIN_STATUS_OK) {
1142 chain_append_node_(chain, node);
1147 FLAC__int64 pos = tell_cb(handle);
1149 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1152 chain->last_offset = (long)pos;
1155 chain->initial_length = chain_calculate_length_(chain);
1160 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)
1162 FLAC__Metadata_Node *node;
1164 FLAC__ASSERT(0 != chain);
1165 FLAC__ASSERT(0 != chain->head);
1167 if(0 != seek_cb(handle, chain->first_offset, SEEK_SET)) {
1168 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1172 for(node = chain->head; node; node = node->next) {
1173 if(!write_metadata_block_header_cb_(handle, write_cb, node->data)) {
1174 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1177 if(!write_metadata_block_data_cb_(handle, write_cb, node->data)) {
1178 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1183 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1185 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
1189 static FLAC__bool chain_rewrite_metadata_in_place_(FLAC__Metadata_Chain *chain)
1194 FLAC__ASSERT(0 != chain->filename);
1196 if(0 == (file = fopen(chain->filename, "r+b"))) {
1197 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1201 /* chain_rewrite_metadata_in_place_cb_() sets chain->status for us */
1202 ret = chain_rewrite_metadata_in_place_cb_(chain, (FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, fseek_wrapper_);
1209 static FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix)
1213 FLAC__Metadata_SimpleIteratorStatus status;
1214 const FLAC__Metadata_Node *node;
1216 FLAC__ASSERT(0 != chain);
1217 FLAC__ASSERT(0 != chain->filename);
1218 FLAC__ASSERT(0 != chain->head);
1220 /* copy the file prefix (data up to first metadata block */
1221 if(0 == (f = fopen(chain->filename, "rb"))) {
1222 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1225 if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) {
1226 chain->status = get_equivalent_status_(status);
1227 cleanup_tempfile_(&tempfile, &tempfilename);
1230 if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) {
1231 chain->status = get_equivalent_status_(status);
1232 cleanup_tempfile_(&tempfile, &tempfilename);
1236 /* write the metadata */
1237 for(node = chain->head; node; node = node->next) {
1238 if(!write_metadata_block_header_(tempfile, &status, node->data)) {
1239 chain->status = get_equivalent_status_(status);
1242 if(!write_metadata_block_data_(tempfile, &status, node->data)) {
1243 chain->status = get_equivalent_status_(status);
1247 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1249 /* copy the file postfix (everything after the metadata) */
1250 if(0 != fseek(f, chain->last_offset, SEEK_SET)) {
1251 cleanup_tempfile_(&tempfile, &tempfilename);
1252 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1255 if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) {
1256 cleanup_tempfile_(&tempfile, &tempfilename);
1257 chain->status = get_equivalent_status_(status);
1261 /* move the tempfile on top of the original */
1263 if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status))
1269 /* assumes 'handle' is already at beginning of file */
1270 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)
1272 FLAC__Metadata_SimpleIteratorStatus status;
1273 const FLAC__Metadata_Node *node;
1275 FLAC__ASSERT(0 != chain);
1276 FLAC__ASSERT(0 == chain->filename);
1277 FLAC__ASSERT(0 != chain->head);
1279 /* copy the file prefix (data up to first metadata block */
1280 if(!copy_n_bytes_from_file_cb_(handle, read_cb, temp_handle, temp_write_cb, chain->first_offset, &status)) {
1281 chain->status = get_equivalent_status_(status);
1285 /* write the metadata */
1286 for(node = chain->head; node; node = node->next) {
1287 if(!write_metadata_block_header_cb_(temp_handle, temp_write_cb, node->data)) {
1288 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1291 if(!write_metadata_block_data_cb_(temp_handle, temp_write_cb, node->data)) {
1292 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1296 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1298 /* copy the file postfix (everything after the metadata) */
1299 if(0 != seek_cb(handle, chain->last_offset, SEEK_SET)) {
1300 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1303 if(!copy_remaining_bytes_from_file_cb_(handle, read_cb, eof_cb, temp_handle, temp_write_cb, &status)) {
1304 chain->status = get_equivalent_status_(status);
1311 FLAC_API FLAC__Metadata_Chain *FLAC__metadata_chain_new()
1313 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)calloc(1, sizeof(FLAC__Metadata_Chain));
1321 FLAC_API void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain)
1323 FLAC__ASSERT(0 != chain);
1325 chain_clear_(chain);
1330 FLAC_API FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain)
1332 FLAC__Metadata_ChainStatus status;
1334 FLAC__ASSERT(0 != chain);
1336 status = chain->status;
1337 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
1341 FLAC_API FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename)
1346 FLAC__ASSERT(0 != chain);
1347 FLAC__ASSERT(0 != filename);
1349 chain_clear_(chain);
1351 if(0 == (chain->filename = strdup(filename))) {
1352 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1356 if(0 == (file = fopen(filename, "rb"))) {
1357 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1361 /* chain_read_cb_() sets chain->status for us */
1362 ret = chain_read_cb_(chain, file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, ftell_wrapper_);
1369 FLAC_API FLAC__bool FLAC__metadata_chain_read_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1371 FLAC__ASSERT(0 != chain);
1373 chain_clear_(chain);
1375 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.tell) {
1376 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1381 if(0 != callbacks.seek(handle, 0, SEEK_SET)) {
1382 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1386 if(!chain_read_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.tell))
1387 return false; /* chain->status is already set by chain_read_cb_ */
1392 FLAC_API FLAC__bool FLAC__metadata_chain_check_if_tempfile_needed(FLAC__Metadata_Chain *chain, FLAC__bool use_padding)
1394 /* This does all the same checks that are in chain_prepare_for_write_()
1395 * but doesn't actually alter the chain. Make sure to update the logic
1396 * here if chain_prepare_for_write_() changes.
1398 const unsigned current_length = chain_calculate_length_(chain);
1400 FLAC__ASSERT(0 != chain);
1403 /* if the metadata shrank and the last block is padding, we just extend the last padding block */
1404 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING)
1406 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */
1407 else if(current_length + FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length)
1409 /* 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 */
1410 else if(current_length > chain->initial_length) {
1411 const unsigned delta = current_length - chain->initial_length;
1412 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1413 /* if the delta is exactly the size of the last padding block, remove the padding block */
1414 if(chain->tail->data->length + FLAC__STREAM_METADATA_HEADER_LENGTH == delta)
1416 /* if there is at least 'delta' bytes of padding, trim the padding down */
1417 else if(chain->tail->data->length >= delta)
1423 return (current_length != chain->initial_length);
1426 FLAC_API FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats)
1429 const char *tempfile_path_prefix = 0;
1430 unsigned current_length;
1432 FLAC__ASSERT(0 != chain);
1434 if (0 == chain->filename) {
1435 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1439 current_length = chain_prepare_for_write_(chain, use_padding);
1441 /* a return value of 0 means there was an error; chain->status is already set */
1442 if (0 == current_length)
1445 if(preserve_file_stats)
1446 get_file_stats_(chain->filename, &stats);
1448 if(current_length == chain->initial_length) {
1449 if(!chain_rewrite_metadata_in_place_(chain))
1453 if(!chain_rewrite_file_(chain, tempfile_path_prefix))
1456 /* recompute lengths and offsets */
1458 const FLAC__Metadata_Node *node;
1459 chain->initial_length = current_length;
1460 chain->last_offset = chain->first_offset;
1461 for(node = chain->head; node; node = node->next)
1462 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1466 if(preserve_file_stats)
1467 set_file_stats_(chain->filename, &stats);
1472 FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1474 unsigned current_length;
1476 FLAC__ASSERT(0 != chain);
1478 if (0 != chain->filename) {
1479 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1483 if (0 == callbacks.write || 0 == callbacks.seek) {
1484 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1488 if (FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) {
1489 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL;
1493 current_length = chain_prepare_for_write_(chain, use_padding);
1495 /* a return value of 0 means there was an error; chain->status is already set */
1496 if (0 == current_length)
1499 FLAC__ASSERT(current_length == chain->initial_length);
1501 return chain_rewrite_metadata_in_place_cb_(chain, handle, callbacks.write, callbacks.seek);
1504 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)
1506 unsigned current_length;
1508 FLAC__ASSERT(0 != chain);
1510 if (0 != chain->filename) {
1511 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1515 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.eof) {
1516 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1519 if (0 == temp_callbacks.write) {
1520 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1524 if (!FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) {
1525 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL;
1529 current_length = chain_prepare_for_write_(chain, use_padding);
1531 /* a return value of 0 means there was an error; chain->status is already set */
1532 if (0 == current_length)
1535 FLAC__ASSERT(current_length != chain->initial_length);
1538 if(0 != callbacks.seek(handle, 0, SEEK_SET)) {
1539 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1543 if(!chain_rewrite_file_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.eof, temp_handle, temp_callbacks.write))
1546 /* recompute lengths and offsets */
1548 const FLAC__Metadata_Node *node;
1549 chain->initial_length = current_length;
1550 chain->last_offset = chain->first_offset;
1551 for(node = chain->head; node; node = node->next)
1552 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1558 FLAC_API void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain)
1560 FLAC__Metadata_Node *node;
1562 FLAC__ASSERT(0 != chain);
1564 for(node = chain->head; node; ) {
1565 if(!chain_merge_adjacent_padding_(chain, node))
1570 FLAC_API void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain)
1572 FLAC__Metadata_Node *node, *save;
1575 FLAC__ASSERT(0 != chain);
1578 * Don't try and be too smart... this simple algo is good enough for
1579 * the small number of nodes that we deal with.
1581 for(i = 0, node = chain->head; i < chain->nodes; i++) {
1582 if(node->data->type == FLAC__METADATA_TYPE_PADDING) {
1584 chain_remove_node_(chain, node);
1585 chain_append_node_(chain, node);
1593 FLAC__metadata_chain_merge_padding(chain);
1597 FLAC_API FLAC__Metadata_Iterator *FLAC__metadata_iterator_new()
1599 FLAC__Metadata_Iterator *iterator = (FLAC__Metadata_Iterator*)calloc(1, sizeof(FLAC__Metadata_Iterator));
1601 /* calloc() implies:
1602 iterator->current = 0;
1603 iterator->chain = 0;
1609 FLAC_API void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator)
1611 FLAC__ASSERT(0 != iterator);
1616 FLAC_API void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain)
1618 FLAC__ASSERT(0 != iterator);
1619 FLAC__ASSERT(0 != chain);
1620 FLAC__ASSERT(0 != chain->head);
1622 iterator->chain = chain;
1623 iterator->current = chain->head;
1626 FLAC_API FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator)
1628 FLAC__ASSERT(0 != iterator);
1630 if(0 == iterator->current || 0 == iterator->current->next)
1633 iterator->current = iterator->current->next;
1637 FLAC_API FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator)
1639 FLAC__ASSERT(0 != iterator);
1641 if(0 == iterator->current || 0 == iterator->current->prev)
1644 iterator->current = iterator->current->prev;
1648 FLAC_API FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator)
1650 FLAC__ASSERT(0 != iterator);
1651 FLAC__ASSERT(0 != iterator->current);
1652 FLAC__ASSERT(0 != iterator->current->data);
1654 return iterator->current->data->type;
1657 FLAC_API FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator)
1659 FLAC__ASSERT(0 != iterator);
1660 FLAC__ASSERT(0 != iterator->current);
1662 return iterator->current->data;
1665 FLAC_API FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1667 FLAC__ASSERT(0 != iterator);
1668 FLAC__ASSERT(0 != block);
1669 return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block);
1672 FLAC_API FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding)
1674 FLAC__Metadata_Node *save;
1676 FLAC__ASSERT(0 != iterator);
1677 FLAC__ASSERT(0 != iterator->current);
1679 if(0 == iterator->current->prev) {
1680 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1684 save = iterator->current->prev;
1686 if(replace_with_padding) {
1687 FLAC__metadata_object_delete_data(iterator->current->data);
1688 iterator->current->data->type = FLAC__METADATA_TYPE_PADDING;
1691 chain_delete_node_(iterator->chain, iterator->current);
1694 iterator->current = save;
1698 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1700 FLAC__Metadata_Node *node;
1702 FLAC__ASSERT(0 != iterator);
1703 FLAC__ASSERT(0 != iterator->current);
1704 FLAC__ASSERT(0 != block);
1706 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1709 if(0 == iterator->current->prev) {
1710 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1714 if(0 == (node = node_new_()))
1718 iterator_insert_node_(iterator, node);
1719 iterator->current = node;
1723 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1725 FLAC__Metadata_Node *node;
1727 FLAC__ASSERT(0 != iterator);
1728 FLAC__ASSERT(0 != iterator->current);
1729 FLAC__ASSERT(0 != block);
1731 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1734 if(0 == (node = node_new_()))
1738 iterator_insert_node_after_(iterator, node);
1739 iterator->current = node;
1744 /****************************************************************************
1746 * Local function definitions
1748 ***************************************************************************/
1750 void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1756 for(i = 0; i < bytes; i++) {
1757 *(--b) = (FLAC__byte)(val & 0xff);
1762 void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1766 for(i = 0; i < bytes; i++) {
1767 *(b++) = (FLAC__byte)(val & 0xff);
1772 void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes)
1778 for(i = 0; i < bytes; i++) {
1779 *(--b) = (FLAC__byte)(val & 0xff);
1784 FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes)
1786 FLAC__uint32 ret = 0;
1789 for(i = 0; i < bytes; i++)
1790 ret = (ret << 8) | (FLAC__uint32)(*b++);
1795 FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes)
1797 FLAC__uint32 ret = 0;
1802 for(i = 0; i < bytes; i++)
1803 ret = (ret << 8) | (FLAC__uint32)(*--b);
1808 FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes)
1810 FLAC__uint64 ret = 0;
1813 for(i = 0; i < bytes; i++)
1814 ret = (ret << 8) | (FLAC__uint64)(*b++);
1819 FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator)
1821 FLAC__ASSERT(0 != iterator);
1822 FLAC__ASSERT(0 != iterator->file);
1824 if(!read_metadata_block_header_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, &iterator->is_last, &iterator->type, &iterator->length)) {
1825 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1832 FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block)
1834 FLAC__ASSERT(0 != iterator);
1835 FLAC__ASSERT(0 != iterator->file);
1837 iterator->status = read_metadata_block_data_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, block);
1839 return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1842 FLAC__bool read_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__bool *is_last, FLAC__MetadataType *type, unsigned *length)
1844 FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH];
1846 if(read_cb(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH)
1849 *is_last = raw_header[0] & 0x80? true : false;
1850 *type = (FLAC__MetadataType)(raw_header[0] & 0x7f);
1851 *length = unpack_uint32_(raw_header + 1, 3);
1853 /* Note that we don't check:
1854 * if(iterator->type >= FLAC__METADATA_TYPE_UNDEFINED)
1855 * we just will read in an opaque block
1861 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata *block)
1863 switch(block->type) {
1864 case FLAC__METADATA_TYPE_STREAMINFO:
1865 return read_metadata_block_data_streaminfo_cb_(handle, read_cb, &block->data.stream_info);
1866 case FLAC__METADATA_TYPE_PADDING:
1867 return read_metadata_block_data_padding_cb_(handle, seek_cb, &block->data.padding, block->length);
1868 case FLAC__METADATA_TYPE_APPLICATION:
1869 return read_metadata_block_data_application_cb_(handle, read_cb, &block->data.application, block->length);
1870 case FLAC__METADATA_TYPE_SEEKTABLE:
1871 return read_metadata_block_data_seektable_cb_(handle, read_cb, &block->data.seek_table, block->length);
1872 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1873 return read_metadata_block_data_vorbis_comment_cb_(handle, read_cb, &block->data.vorbis_comment);
1874 case FLAC__METADATA_TYPE_CUESHEET:
1875 return read_metadata_block_data_cuesheet_cb_(handle, read_cb, &block->data.cue_sheet);
1877 return read_metadata_block_data_unknown_cb_(handle, read_cb, &block->data.unknown, block->length);
1881 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block)
1883 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b;
1885 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1886 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1890 /* we are using hardcoded numbers for simplicity but we should
1891 * probably eventually write a bit-level unpacker and use the
1892 * _STREAMINFO_ constants.
1894 block->min_blocksize = unpack_uint32_(b, 2); b += 2;
1895 block->max_blocksize = unpack_uint32_(b, 2); b += 2;
1896 block->min_framesize = unpack_uint32_(b, 3); b += 3;
1897 block->max_framesize = unpack_uint32_(b, 3); b += 3;
1898 block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4);
1899 block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
1900 block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 4) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1;
1901 block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4);
1902 memcpy(block->md5sum, b+8, 16);
1904 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1908 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_Padding *block, unsigned block_length)
1910 (void)block; /* nothing to do; we don't care about reading the padding bytes */
1912 if(0 != seek_cb(handle, block_length, SEEK_CUR))
1913 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1915 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1918 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, unsigned block_length)
1920 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1922 if(read_cb(block->id, 1, id_bytes, handle) != id_bytes)
1923 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1925 block_length -= id_bytes;
1927 if(block_length == 0) {
1931 if(0 == (block->data = (FLAC__byte*)malloc(block_length)))
1932 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1934 if(read_cb(block->data, 1, block_length, handle) != block_length)
1935 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1938 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1941 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, unsigned block_length)
1944 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1946 FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0);
1948 block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1950 if(block->num_points == 0)
1952 else if(0 == (block->points = (FLAC__StreamMetadata_SeekPoint*)malloc(block->num_points * sizeof(FLAC__StreamMetadata_SeekPoint))))
1953 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1955 for(i = 0; i < block->num_points; i++) {
1956 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1957 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1958 /* some MAGIC NUMBERs here */
1959 block->points[i].sample_number = unpack_uint64_(buffer, 8);
1960 block->points[i].stream_offset = unpack_uint64_(buffer+8, 8);
1961 block->points[i].frame_samples = unpack_uint32_(buffer+16, 2);
1964 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1967 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment_Entry *entry)
1969 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1970 FLAC__byte buffer[4]; /* magic number is asserted below */
1972 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8 == 4);
1974 if(read_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
1975 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1976 entry->length = unpack_uint32_little_endian_(buffer, entry_length_len);
1978 if(0 != entry->entry)
1981 if(entry->length == 0) {
1985 if(0 == (entry->entry = (FLAC__byte*)malloc(entry->length+1)))
1986 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1988 if(read_cb(entry->entry, 1, entry->length, handle) != entry->length)
1989 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1991 entry->entry[entry->length] = '\0';
1994 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1997 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment *block)
2000 FLAC__Metadata_SimpleIteratorStatus status;
2001 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
2002 FLAC__byte buffer[4]; /* magic number is asserted below */
2004 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8 == 4);
2006 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, &(block->vendor_string))))
2009 if(read_cb(buffer, 1, num_comments_len, handle) != num_comments_len)
2010 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2011 block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len);
2013 if(block->num_comments == 0) {
2014 block->comments = 0;
2016 else if(0 == (block->comments = (FLAC__StreamMetadata_VorbisComment_Entry*)calloc(block->num_comments, sizeof(FLAC__StreamMetadata_VorbisComment_Entry))))
2017 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2019 for(i = 0; i < block->num_comments; i++) {
2020 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, block->comments + i)))
2024 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2027 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track)
2030 FLAC__byte buffer[32]; /* asserted below that this is big enough */
2032 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
2033 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
2034 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);
2036 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
2037 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
2038 if(read_cb(buffer, 1, len, handle) != len)
2039 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2040 track->offset = unpack_uint64_(buffer, len);
2042 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
2043 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
2044 if(read_cb(buffer, 1, len, handle) != len)
2045 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2046 track->number = (FLAC__byte)unpack_uint32_(buffer, len);
2048 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
2049 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
2050 if(read_cb(track->isrc, 1, len, handle) != len)
2051 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2053 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);
2054 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
2055 if(read_cb(buffer, 1, len, handle) != len)
2056 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2057 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN == 1);
2058 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN == 1);
2059 track->type = buffer[0] >> 7;
2060 track->pre_emphasis = (buffer[0] >> 6) & 1;
2062 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
2063 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
2064 if(read_cb(buffer, 1, len, handle) != len)
2065 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2066 track->num_indices = (FLAC__byte)unpack_uint32_(buffer, len);
2068 if(track->num_indices == 0) {
2071 else if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)calloc(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index))))
2072 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2074 for(i = 0; i < track->num_indices; i++) {
2075 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
2076 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
2077 if(read_cb(buffer, 1, len, handle) != len)
2078 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2079 track->indices[i].offset = unpack_uint64_(buffer, len);
2081 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
2082 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
2083 if(read_cb(buffer, 1, len, handle) != len)
2084 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2085 track->indices[i].number = (FLAC__byte)unpack_uint32_(buffer, len);
2087 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
2088 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
2089 if(read_cb(buffer, 1, len, handle) != len)
2090 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2093 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2096 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block)
2099 FLAC__Metadata_SimpleIteratorStatus status;
2100 FLAC__byte buffer[1024]; /* MSVC needs a constant expression so we put a magic number and assert */
2102 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN)/8 <= sizeof(buffer));
2103 FLAC__ASSERT(sizeof(FLAC__uint64) <= sizeof(buffer));
2105 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
2106 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
2107 if(read_cb(block->media_catalog_number, 1, len, handle) != len)
2108 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2110 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
2111 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
2112 if(read_cb(buffer, 1, len, handle) != len)
2113 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2114 block->lead_in = unpack_uint64_(buffer, len);
2116 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
2117 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
2118 if(read_cb(buffer, 1, len, handle) != len)
2119 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2120 block->is_cd = buffer[0]&0x80? true : false;
2122 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
2123 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
2124 if(read_cb(buffer, 1, len, handle) != len)
2125 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2126 block->num_tracks = unpack_uint32_(buffer, len);
2128 if(block->num_tracks == 0) {
2131 else if(0 == (block->tracks = (FLAC__StreamMetadata_CueSheet_Track*)calloc(block->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track))))
2132 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2134 for(i = 0; i < block->num_tracks; i++) {
2135 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_cuesheet_track_cb_(handle, read_cb, block->tracks + i)))
2139 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2142 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, unsigned block_length)
2144 if(block_length == 0) {
2148 if(0 == (block->data = (FLAC__byte*)malloc(block_length)))
2149 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2151 if(read_cb(block->data, 1, block_length, handle) != block_length)
2152 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2155 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2158 FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
2160 FLAC__ASSERT(0 != file);
2161 FLAC__ASSERT(0 != status);
2163 if(!write_metadata_block_header_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) {
2164 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2171 FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
2173 FLAC__ASSERT(0 != file);
2174 FLAC__ASSERT(0 != status);
2176 if (write_metadata_block_data_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) {
2177 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2181 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2186 FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block)
2188 FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH];
2190 FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
2192 buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type;
2193 pack_uint32_(block->length, buffer + 1, 3);
2195 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH)
2201 FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block)
2203 FLAC__ASSERT(0 != block);
2205 switch(block->type) {
2206 case FLAC__METADATA_TYPE_STREAMINFO:
2207 return write_metadata_block_data_streaminfo_cb_(handle, write_cb, &block->data.stream_info);
2208 case FLAC__METADATA_TYPE_PADDING:
2209 return write_metadata_block_data_padding_cb_(handle, write_cb, &block->data.padding, block->length);
2210 case FLAC__METADATA_TYPE_APPLICATION:
2211 return write_metadata_block_data_application_cb_(handle, write_cb, &block->data.application, block->length);
2212 case FLAC__METADATA_TYPE_SEEKTABLE:
2213 return write_metadata_block_data_seektable_cb_(handle, write_cb, &block->data.seek_table);
2214 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
2215 return write_metadata_block_data_vorbis_comment_cb_(handle, write_cb, &block->data.vorbis_comment);
2216 case FLAC__METADATA_TYPE_CUESHEET:
2217 return write_metadata_block_data_cuesheet_cb_(handle, write_cb, &block->data.cue_sheet);
2219 return write_metadata_block_data_unknown_cb_(handle, write_cb, &block->data.unknown, block->length);
2223 FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block)
2225 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH];
2226 const unsigned channels1 = block->channels - 1;
2227 const unsigned bps1 = block->bits_per_sample - 1;
2229 /* we are using hardcoded numbers for simplicity but we should
2230 * probably eventually write a bit-level packer and use the
2231 * _STREAMINFO_ constants.
2233 pack_uint32_(block->min_blocksize, buffer, 2);
2234 pack_uint32_(block->max_blocksize, buffer+2, 2);
2235 pack_uint32_(block->min_framesize, buffer+4, 3);
2236 pack_uint32_(block->max_framesize, buffer+7, 3);
2237 buffer[10] = (block->sample_rate >> 12) & 0xff;
2238 buffer[11] = (block->sample_rate >> 4) & 0xff;
2239 buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4);
2240 buffer[13] = (FLAC__byte)(((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f));
2241 pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4);
2242 memcpy(buffer+18, block->md5sum, 16);
2244 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
2250 FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, unsigned block_length)
2252 unsigned i, n = block_length;
2253 FLAC__byte buffer[1024];
2257 memset(buffer, 0, 1024);
2259 for(i = 0; i < n/1024; i++)
2260 if(write_cb(buffer, 1, 1024, handle) != 1024)
2265 if(write_cb(buffer, 1, n, handle) != n)
2271 FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, unsigned block_length)
2273 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
2275 if(write_cb(block->id, 1, id_bytes, handle) != id_bytes)
2278 block_length -= id_bytes;
2280 if(write_cb(block->data, 1, block_length, handle) != block_length)
2286 FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block)
2289 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
2291 for(i = 0; i < block->num_points; i++) {
2292 /* some MAGIC NUMBERs here */
2293 pack_uint64_(block->points[i].sample_number, buffer, 8);
2294 pack_uint64_(block->points[i].stream_offset, buffer+8, 8);
2295 pack_uint32_(block->points[i].frame_samples, buffer+16, 2);
2296 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
2303 FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block)
2306 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
2307 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
2308 FLAC__byte buffer[4]; /* magic number is asserted below */
2310 FLAC__ASSERT(max(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8 == 4);
2312 pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len);
2313 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2315 if(write_cb(block->vendor_string.entry, 1, block->vendor_string.length, handle) != block->vendor_string.length)
2318 pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len);
2319 if(write_cb(buffer, 1, num_comments_len, handle) != num_comments_len)
2322 for(i = 0; i < block->num_comments; i++) {
2323 pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len);
2324 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2326 if(write_cb(block->comments[i].entry, 1, block->comments[i].length, handle) != block->comments[i].length)
2333 FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block)
2336 FLAC__byte buffer[1024]; /* asserted below that this is big enough */
2338 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
2339 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN/8);
2340 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);
2341 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
2343 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
2344 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
2345 if(write_cb(block->media_catalog_number, 1, len, handle) != len)
2348 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
2349 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
2350 pack_uint64_(block->lead_in, buffer, len);
2351 if(write_cb(buffer, 1, len, handle) != len)
2354 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
2355 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
2356 memset(buffer, 0, len);
2359 if(write_cb(buffer, 1, len, handle) != len)
2362 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
2363 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
2364 pack_uint32_(block->num_tracks, buffer, len);
2365 if(write_cb(buffer, 1, len, handle) != len)
2368 for(i = 0; i < block->num_tracks; i++) {
2369 FLAC__StreamMetadata_CueSheet_Track *track = block->tracks + i;
2371 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
2372 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
2373 pack_uint64_(track->offset, buffer, len);
2374 if(write_cb(buffer, 1, len, handle) != len)
2377 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
2378 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
2379 pack_uint32_(track->number, buffer, len);
2380 if(write_cb(buffer, 1, len, handle) != len)
2383 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
2384 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
2385 if(write_cb(track->isrc, 1, len, handle) != len)
2388 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);
2389 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
2390 memset(buffer, 0, len);
2391 buffer[0] = (track->type << 7) | (track->pre_emphasis << 6);
2392 if(write_cb(buffer, 1, len, handle) != len)
2395 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
2396 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
2397 pack_uint32_(track->num_indices, buffer, len);
2398 if(write_cb(buffer, 1, len, handle) != len)
2401 for(j = 0; j < track->num_indices; j++) {
2402 FLAC__StreamMetadata_CueSheet_Index *index = track->indices + j;
2404 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
2405 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
2406 pack_uint64_(index->offset, buffer, len);
2407 if(write_cb(buffer, 1, len, handle) != len)
2410 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
2411 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
2412 pack_uint32_(index->number, buffer, len);
2413 if(write_cb(buffer, 1, len, handle) != len)
2416 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
2417 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
2418 memset(buffer, 0, len);
2419 if(write_cb(buffer, 1, len, handle) != len)
2427 FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, unsigned block_length)
2429 if(write_cb(block->data, 1, block_length, handle) != block_length)
2435 FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block)
2437 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2438 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2442 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
2445 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
2448 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2449 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2453 return read_metadata_block_header_(iterator);
2456 FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last)
2458 FLAC__StreamMetadata *padding;
2460 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2461 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2465 block->is_last = false;
2467 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
2470 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
2473 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)))
2474 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2476 padding->is_last = padding_is_last;
2477 padding->length = padding_length;
2479 if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) {
2480 FLAC__metadata_object_delete(padding);
2484 if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) {
2485 FLAC__metadata_object_delete(padding);
2489 FLAC__metadata_object_delete(padding);
2491 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2492 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2496 return read_metadata_block_header_(iterator);
2499 FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append)
2503 int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */
2504 long fixup_is_last_flag_offset = -1;
2506 FLAC__ASSERT(0 != block || append == false);
2508 if(iterator->is_last) {
2510 fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */
2511 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2513 else if(0 == block) {
2514 simple_iterator_push_(iterator);
2515 if(!FLAC__metadata_simple_iterator_prev(iterator)) {
2516 (void)simple_iterator_pop_(iterator);
2519 fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */
2520 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2521 if(!simple_iterator_pop_(iterator))
2526 if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append))
2530 if(!write_metadata_block_header_(tempfile, &iterator->status, block)) {
2531 cleanup_tempfile_(&tempfile, &tempfilename);
2535 if(!write_metadata_block_data_(tempfile, &iterator->status, block)) {
2536 cleanup_tempfile_(&tempfile, &tempfilename);
2541 if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0))
2545 return FLAC__metadata_simple_iterator_next(iterator);
2550 void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator)
2552 FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH);
2553 iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth];
2557 FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator)
2559 FLAC__ASSERT(iterator->depth > 0);
2561 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2562 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2566 return read_metadata_block_header_(iterator);
2573 * 3: not a FLAC file
2575 unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb)
2577 FLAC__byte buffer[4];
2581 FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == 4);
2583 /* skip any id3v2 tag */
2585 n = read_cb(buffer, 1, 4, handle);
2590 else if(0 == memcmp(buffer, "ID3", 3)) {
2591 unsigned tag_length = 0;
2593 /* skip to the tag length */
2594 if(seek_cb(handle, 2, SEEK_CUR) < 0)
2597 /* read the length */
2598 for(i = 0; i < 4; i++) {
2599 if(read_cb(buffer, 1, 1, handle) < 1 || buffer[0] & 0x80)
2602 tag_length |= (buffer[0] & 0x7f);
2605 /* skip the rest of the tag */
2606 if(seek_cb(handle, tag_length, SEEK_CUR) < 0)
2609 /* read the stream sync code */
2611 n = read_cb(buffer, 1, 4, handle);
2618 /* check for the fLaC signature */
2619 if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH))
2625 unsigned seek_to_first_metadata_block_(FILE *f)
2627 return seek_to_first_metadata_block_cb_((FLAC__IOHandle)f, (FLAC__IOCallback_Read)fread, fseek_wrapper_);
2630 FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append)
2632 const long offset_end = append? iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length : iterator->offset[iterator->depth];
2634 if(0 != fseek(iterator->file, 0, SEEK_SET)) {
2635 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2638 if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) {
2639 cleanup_tempfile_(tempfile, tempfilename);
2642 if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) {
2643 cleanup_tempfile_(tempfile, tempfilename);
2650 FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, long fixup_is_last_flag_offset, FLAC__bool backup)
2652 long save_offset = iterator->offset[iterator->depth]; /*@@@ 2G limit */
2653 FLAC__ASSERT(0 != *tempfile);
2655 if(0 != fseek(iterator->file, save_offset + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length, SEEK_SET)) {
2656 cleanup_tempfile_(tempfile, tempfilename);
2657 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2660 if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) {
2661 cleanup_tempfile_(tempfile, tempfilename);
2665 if(fixup_is_last_code != 0) {
2667 * if code == 1, it means a block was appended to the end so
2668 * we have to clear the is_last flag of the previous block
2669 * if code == -1, it means the last block was deleted so
2670 * we have to set the is_last flag of the previous block
2672 /* MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */
2674 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2675 cleanup_tempfile_(tempfile, tempfilename);
2676 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2679 if(fread(&x, 1, 1, *tempfile) != 1) {
2680 cleanup_tempfile_(tempfile, tempfilename);
2681 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2684 if(fixup_is_last_code > 0) {
2685 FLAC__ASSERT(x & 0x80);
2689 FLAC__ASSERT(!(x & 0x80));
2692 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2693 cleanup_tempfile_(tempfile, tempfilename);
2694 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2697 if(local__fwrite(&x, 1, 1, *tempfile) != 1) {
2698 cleanup_tempfile_(tempfile, tempfilename);
2699 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2704 (void)fclose(iterator->file);
2706 if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status))
2709 if(iterator->has_stats)
2710 set_file_stats_(iterator->filename, &iterator->stats);
2712 if(!simple_iterator_prime_input_(iterator, !iterator->is_writable))
2715 while(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length < save_offset)
2716 if(!FLAC__metadata_simple_iterator_next(iterator))
2721 /* move the iterator to it's original block faster by faking a push, then doing a pop_ */
2722 FLAC__ASSERT(iterator->depth == 0);
2723 iterator->offset[0] = save_offset;
2725 return simple_iterator_pop_(iterator);
2729 FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, unsigned bytes/*@@@ 4G limit*/, FLAC__Metadata_SimpleIteratorStatus *status)
2731 FLAC__byte buffer[8192];
2735 n = min(sizeof(buffer), bytes);
2736 if(fread(buffer, 1, n, file) != n) {
2737 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2740 if(local__fwrite(buffer, 1, n, tempfile) != n) {
2741 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2750 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, unsigned bytes/*@@@ 4G limit*/, FLAC__Metadata_SimpleIteratorStatus *status)
2752 FLAC__byte buffer[8192];
2756 n = min(sizeof(buffer), bytes);
2757 if(read_cb(buffer, 1, n, handle) != n) {
2758 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2761 if(temp_write_cb(buffer, 1, n, temp_handle) != n) {
2762 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2771 FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status)
2773 FLAC__byte buffer[8192];
2776 while(!feof(file)) {
2777 n = fread(buffer, 1, sizeof(buffer), file);
2778 if(n == 0 && !feof(file)) {
2779 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2782 if(n > 0 && local__fwrite(buffer, 1, n, tempfile) != n) {
2783 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2791 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)
2793 FLAC__byte buffer[8192];
2796 while(!eof_cb(handle)) {
2797 n = read_cb(buffer, 1, sizeof(buffer), handle);
2798 if(n == 0 && !eof_cb(handle)) {
2799 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2802 if(n > 0 && temp_write_cb(buffer, 1, n, temp_handle) != n) {
2803 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2811 FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
2813 static const char *tempfile_suffix = ".metadata_edit";
2814 if(0 == tempfile_path_prefix) {
2815 if(0 == (*tempfilename = (char*)malloc(strlen(filename) + strlen(tempfile_suffix) + 1))) {
2816 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2819 strcpy(*tempfilename, filename);
2820 strcat(*tempfilename, tempfile_suffix);
2823 const char *p = strrchr(filename, '/');
2829 if(0 == (*tempfilename = (char*)malloc(strlen(tempfile_path_prefix) + 1 + strlen(p) + strlen(tempfile_suffix) + 1))) {
2830 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2833 strcpy(*tempfilename, tempfile_path_prefix);
2834 strcat(*tempfilename, "/");
2835 strcat(*tempfilename, p);
2836 strcat(*tempfilename, tempfile_suffix);
2839 if(0 == (*tempfile = fopen(*tempfilename, "w+b"))) {
2840 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
2847 FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
2849 FLAC__ASSERT(0 != filename);
2850 FLAC__ASSERT(0 != tempfile);
2851 FLAC__ASSERT(0 != *tempfile);
2852 FLAC__ASSERT(0 != tempfilename);
2853 FLAC__ASSERT(0 != *tempfilename);
2854 FLAC__ASSERT(0 != status);
2856 (void)fclose(*tempfile);
2859 #if defined _MSC_VER || defined __MINGW32__
2860 if(unlink(filename) < 0) {
2861 cleanup_tempfile_(tempfile, tempfilename);
2862 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR;
2867 /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just rename(): */
2868 if(0 != rename(*tempfilename, filename)) {
2869 cleanup_tempfile_(tempfile, tempfilename);
2870 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR;
2874 cleanup_tempfile_(tempfile, tempfilename);
2879 void cleanup_tempfile_(FILE **tempfile, char **tempfilename)
2881 if(0 != *tempfile) {
2882 (void)fclose(*tempfile);
2886 if(0 != *tempfilename) {
2887 (void)unlink(*tempfilename);
2888 free(*tempfilename);
2893 FLAC__bool get_file_stats_(const char *filename, struct stat *stats)
2895 FLAC__ASSERT(0 != filename);
2896 FLAC__ASSERT(0 != stats);
2897 return (0 == stat(filename, stats));
2900 void set_file_stats_(const char *filename, struct stat *stats)
2902 struct utimbuf srctime;
2904 FLAC__ASSERT(0 != filename);
2905 FLAC__ASSERT(0 != stats);
2907 srctime.actime = stats->st_atime;
2908 srctime.modtime = stats->st_mtime;
2909 (void)chmod(filename, stats->st_mode);
2910 (void)utime(filename, &srctime);
2911 #if !defined _MSC_VER && !defined __MINGW32__
2912 (void)chown(filename, stats->st_uid, -1);
2913 (void)chown(filename, -1, stats->st_gid);
2918 * We cast FLAC__int64 to long and use fseek()/ftell() because
2919 * none of our operations on metadata is ever likely to go past
2922 int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence)
2924 FLAC__ASSERT(offset <= 0x7fffffff);
2925 return fseek((FILE*)handle, (long)offset, whence);
2928 FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle)
2930 return (long)ftell((FILE*)handle);
2933 FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status)
2936 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK:
2937 return FLAC__METADATA_CHAIN_STATUS_OK;
2938 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT:
2939 return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT;
2940 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE:
2941 return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
2942 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE:
2943 return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
2944 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE:
2945 return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE;
2946 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA:
2947 return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA;
2948 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR:
2949 return FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
2950 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR:
2951 return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
2952 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR:
2953 return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
2954 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR:
2955 return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR;
2956 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR:
2957 return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR;
2958 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR:
2959 return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
2960 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR:
2962 return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;