1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2001,2002,2003,2004,2005,2006 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.
41 #if defined _MSC_VER || defined __MINGW32__
42 #include <sys/utime.h> /* for utime() */
43 #include <io.h> /* for chmod() */
44 #include <sys/types.h> /* for off_t */
45 //@@@ [2G limit] hacks for MSVC6
49 #include <sys/types.h> /* some flavors of BSD (like OS X) require this to get time_t */
50 #include <utime.h> /* for utime() */
51 #include <unistd.h> /* for chown(), unlink() */
53 #include <sys/stat.h> /* for stat(), maybe chmod() */
55 #include "private/metadata.h"
57 #include "FLAC/assert.h"
58 #include "FLAC/stream_decoder.h"
63 #define max(a,b) ((a)>(b)?(a):(b))
67 #define min(a,b) ((a)<(b)?(a):(b))
70 /****************************************************************************
72 * Local function declarations
74 ***************************************************************************/
76 static void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
77 static void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
78 static void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes);
79 static FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes);
80 static FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes);
81 static FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes);
83 static FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator);
84 static FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block);
85 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);
86 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);
87 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block);
88 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);
89 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);
90 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);
91 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);
92 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment *block);
93 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track);
94 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block);
95 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);
97 static FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
98 static FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
99 static FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block);
100 static FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block);
101 static FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block);
102 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);
103 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);
104 static FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block);
105 static FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block);
106 static FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block);
107 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);
109 static FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block);
110 static FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last);
111 static FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append);
113 static void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator);
114 static FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator);
116 static unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb);
117 static unsigned seek_to_first_metadata_block_(FILE *f);
119 static FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append);
120 static FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, off_t fixup_is_last_flag_offset, FLAC__bool backup);
122 static FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status);
123 static FLAC__bool copy_n_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status);
124 static FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status);
125 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);
127 static FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
128 static FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
129 static void cleanup_tempfile_(FILE **tempfile, char **tempfilename);
131 static FLAC__bool get_file_stats_(const char *filename, struct stat *stats);
132 static void set_file_stats_(const char *filename, struct stat *stats);
134 static int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence);
135 static FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle);
137 static FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status);
140 #ifdef FLAC__VALGRIND_TESTING
141 static size_t local__fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
143 size_t ret = fwrite(ptr, size, nmemb, stream);
149 #define local__fwrite fwrite
152 /****************************************************************************
154 * Level 0 implementation
156 ***************************************************************************/
158 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
159 static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
160 static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
163 FLAC__bool got_error;
164 FLAC__StreamMetadata *object;
165 } level0_client_data;
167 static FLAC__StreamMetadata *get_one_metadata_block_(const char *filename, FLAC__MetadataType type)
169 level0_client_data cd;
170 FLAC__StreamDecoder *decoder;
172 FLAC__ASSERT(0 != filename);
174 cd.got_error = false;
177 decoder = FLAC__stream_decoder_new();
182 FLAC__stream_decoder_set_md5_checking(decoder, false);
183 FLAC__stream_decoder_set_metadata_ignore_all(decoder);
184 FLAC__stream_decoder_set_metadata_respond(decoder, type);
186 if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, metadata_callback_, error_callback_, &cd) != FLAC__STREAM_DECODER_INIT_STATUS_OK || cd.got_error) {
187 FLAC__stream_decoder_finish(decoder);
188 FLAC__stream_decoder_delete(decoder);
192 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder) || cd.got_error) {
193 FLAC__stream_decoder_finish(decoder);
194 FLAC__stream_decoder_delete(decoder);
196 FLAC__metadata_object_delete(cd.object);
200 FLAC__stream_decoder_finish(decoder);
201 FLAC__stream_decoder_delete(decoder);
206 FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo)
208 FLAC__StreamMetadata *object;
210 FLAC__ASSERT(0 != filename);
211 FLAC__ASSERT(0 != streaminfo);
213 object = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_STREAMINFO);
216 /* can just copy the contents since STREAMINFO has no internal structure */
217 *streaminfo = *object;
218 FLAC__metadata_object_delete(object);
226 FLAC_API FLAC__bool FLAC__metadata_get_tags(const char *filename, FLAC__StreamMetadata **tags)
228 FLAC__ASSERT(0 != filename);
229 FLAC__ASSERT(0 != tags);
231 *tags = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_VORBIS_COMMENT);
236 FLAC_API FLAC__bool FLAC__metadata_get_cuesheet(const char *filename, FLAC__StreamMetadata **cuesheet)
238 FLAC__ASSERT(0 != filename);
239 FLAC__ASSERT(0 != cuesheet);
241 *cuesheet = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_CUESHEET);
243 return 0 != *cuesheet;
246 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
248 (void)decoder, (void)frame, (void)buffer, (void)client_data;
250 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
253 void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
255 level0_client_data *cd = (level0_client_data *)client_data;
259 * we assume we only get here when the one metadata block we were
260 * looking for was passed to us
262 if(!cd->got_error && 0 == cd->object) {
263 if(0 == (cd->object = FLAC__metadata_object_clone(metadata)))
264 cd->got_error = true;
268 void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
270 level0_client_data *cd = (level0_client_data *)client_data;
273 if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
274 cd->got_error = true;
278 /****************************************************************************
280 * Level 1 implementation
282 ***************************************************************************/
284 #define SIMPLE_ITERATOR_MAX_PUSH_DEPTH (1+4)
285 /* 1 for initial offset, +4 for our own personal use */
287 struct FLAC__Metadata_SimpleIterator {
289 char *filename, *tempfile_path_prefix;
291 FLAC__bool has_stats;
292 FLAC__bool is_writable;
293 FLAC__Metadata_SimpleIteratorStatus status;
294 off_t offset[SIMPLE_ITERATOR_MAX_PUSH_DEPTH];
295 off_t first_offset; /* this is the offset to the STREAMINFO block */
297 /* this is the metadata block header of the current block we are pointing to: */
299 FLAC__MetadataType type;
303 FLAC_API const char * const FLAC__Metadata_SimpleIteratorStatusString[] = {
304 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK",
305 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT",
306 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE",
307 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE",
308 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE",
309 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA",
310 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR",
311 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR",
312 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR",
313 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR",
314 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR",
315 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR",
316 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR"
320 FLAC_API FLAC__Metadata_SimpleIterator *FLAC__metadata_simple_iterator_new()
322 FLAC__Metadata_SimpleIterator *iterator = (FLAC__Metadata_SimpleIterator*)calloc(1, sizeof(FLAC__Metadata_SimpleIterator));
326 iterator->filename = 0;
327 iterator->tempfile_path_prefix = 0;
328 iterator->has_stats = false;
329 iterator->is_writable = false;
330 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
331 iterator->first_offset = iterator->offset[0] = -1;
338 static void simple_iterator_free_guts_(FLAC__Metadata_SimpleIterator *iterator)
340 FLAC__ASSERT(0 != iterator);
342 if(0 != iterator->file) {
343 fclose(iterator->file);
345 if(iterator->has_stats)
346 set_file_stats_(iterator->filename, &iterator->stats);
348 if(0 != iterator->filename) {
349 free(iterator->filename);
350 iterator->filename = 0;
352 if(0 != iterator->tempfile_path_prefix) {
353 free(iterator->tempfile_path_prefix);
354 iterator->tempfile_path_prefix = 0;
358 FLAC_API void FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator *iterator)
360 FLAC__ASSERT(0 != iterator);
362 simple_iterator_free_guts_(iterator);
366 FLAC_API FLAC__Metadata_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator *iterator)
368 FLAC__Metadata_SimpleIteratorStatus status;
370 FLAC__ASSERT(0 != iterator);
372 status = iterator->status;
373 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
377 static FLAC__bool simple_iterator_prime_input_(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool read_only)
381 FLAC__ASSERT(0 != iterator);
383 if(read_only || 0 == (iterator->file = fopen(iterator->filename, "r+b"))) {
384 iterator->is_writable = false;
385 if(read_only || errno == EACCES) {
386 if(0 == (iterator->file = fopen(iterator->filename, "rb"))) {
387 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
392 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
397 iterator->is_writable = true;
400 ret = seek_to_first_metadata_block_(iterator->file);
404 iterator->first_offset = iterator->offset[iterator->depth] = ftello(iterator->file);
405 return read_metadata_block_header_(iterator);
407 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
410 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
413 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE;
422 @@@ If we decide to finish implementing this, put this comment back in metadata.h
424 * The 'tempfile_path_prefix' allows you to specify a directory where
425 * tempfiles should go. Remember that if your metadata edits cause the
426 * FLAC file to grow, the entire file will have to be rewritten. If
427 * 'tempfile_path_prefix' is NULL, the temp file will be written in the
428 * same directory as the original FLAC file. This makes replacing the
429 * original with the tempfile fast but requires extra space in the same
430 * partition for the tempfile. If space is a problem, you can pass a
431 * directory name belonging to a different partition in
432 * 'tempfile_path_prefix'. Note that you should use the forward slash
433 * '/' as the directory separator. A trailing slash is not needed; it
434 * will be added automatically.
436 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats, const char *tempfile_path_prefix);
439 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)
441 const char *tempfile_path_prefix = 0; /*@@@ search for comments near 'rename(...)' for what it will take to finish implementing this */
443 FLAC__ASSERT(0 != iterator);
444 FLAC__ASSERT(0 != filename);
446 simple_iterator_free_guts_(iterator);
448 if(!read_only && preserve_file_stats)
449 iterator->has_stats = get_file_stats_(filename, &iterator->stats);
451 if(0 == (iterator->filename = strdup(filename))) {
452 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
455 if(0 != tempfile_path_prefix && 0 == (iterator->tempfile_path_prefix = strdup(tempfile_path_prefix))) {
456 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
460 return simple_iterator_prime_input_(iterator, read_only);
463 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator *iterator)
465 FLAC__ASSERT(0 != iterator);
466 FLAC__ASSERT(0 != iterator->file);
468 return iterator->is_writable;
471 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator *iterator)
473 FLAC__ASSERT(0 != iterator);
474 FLAC__ASSERT(0 != iterator->file);
476 if(iterator->is_last)
479 if(0 != fseeko(iterator->file, iterator->length, SEEK_CUR)) {
480 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
484 iterator->offset[iterator->depth] = ftello(iterator->file);
486 return read_metadata_block_header_(iterator);
489 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator *iterator)
493 FLAC__ASSERT(0 != iterator);
494 FLAC__ASSERT(0 != iterator->file);
496 if(iterator->offset[iterator->depth] == iterator->first_offset)
499 if(0 != fseeko(iterator->file, iterator->first_offset, SEEK_SET)) {
500 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
503 this_offset = iterator->first_offset;
504 if(!read_metadata_block_header_(iterator))
507 /* we ignore any error from ftello() and catch it in fseeko() */
508 while(ftello(iterator->file) + (off_t)iterator->length < iterator->offset[iterator->depth]) {
509 if(0 != fseeko(iterator->file, iterator->length, SEEK_CUR)) {
510 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
513 this_offset = ftello(iterator->file);
514 if(!read_metadata_block_header_(iterator))
518 iterator->offset[iterator->depth] = this_offset;
523 FLAC_API FLAC__MetadataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator *iterator)
525 FLAC__ASSERT(0 != iterator);
526 FLAC__ASSERT(0 != iterator->file);
528 return iterator->type;
531 FLAC_API FLAC__StreamMetadata *FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator *iterator)
533 FLAC__StreamMetadata *block = FLAC__metadata_object_new(iterator->type);
535 FLAC__ASSERT(0 != iterator);
536 FLAC__ASSERT(0 != iterator->file);
539 block->is_last = iterator->is_last;
540 block->length = iterator->length;
542 if(!read_metadata_block_data_(iterator, block)) {
543 FLAC__metadata_object_delete(block);
547 /* back up to the beginning of the block data to stay consistent */
548 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH, SEEK_SET)) {
549 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
550 FLAC__metadata_object_delete(block);
555 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
560 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
562 FLAC__ASSERT_DECLARATION(off_t debug_target_offset = iterator->offset[iterator->depth];)
565 FLAC__ASSERT(0 != iterator);
566 FLAC__ASSERT(0 != iterator->file);
567 FLAC__ASSERT(0 != block);
569 if(!iterator->is_writable) {
570 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE;
574 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO || block->type == FLAC__METADATA_TYPE_STREAMINFO) {
575 if(iterator->type != block->type) {
576 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
581 block->is_last = iterator->is_last;
583 if(iterator->length == block->length)
584 return write_metadata_block_stationary_(iterator, block);
585 else if(iterator->length > block->length) {
586 if(use_padding && iterator->length >= FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) {
587 ret = write_metadata_block_stationary_with_padding_(iterator, block, iterator->length - FLAC__STREAM_METADATA_HEADER_LENGTH - block->length, block->is_last);
588 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
589 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
593 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
594 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
595 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
599 else /* iterator->length < block->length */ {
600 unsigned padding_leftover = 0;
601 FLAC__bool padding_is_last = false;
603 /* first see if we can even use padding */
604 if(iterator->is_last) {
608 const unsigned extra_padding_bytes_required = block->length - iterator->length;
609 simple_iterator_push_(iterator);
610 if(!FLAC__metadata_simple_iterator_next(iterator)) {
611 (void)simple_iterator_pop_(iterator);
614 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
618 if(FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length == extra_padding_bytes_required) {
619 padding_leftover = 0;
620 block->is_last = iterator->is_last;
622 else if(iterator->length < extra_padding_bytes_required)
625 padding_leftover = FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length - extra_padding_bytes_required;
626 padding_is_last = iterator->is_last;
627 block->is_last = false;
630 if(!simple_iterator_pop_(iterator))
635 if(padding_leftover == 0) {
636 ret = write_metadata_block_stationary_(iterator, block);
637 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
638 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
642 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
643 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
644 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
645 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
650 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
651 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
652 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
658 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
660 unsigned padding_leftover = 0;
661 FLAC__bool padding_is_last = false;
663 FLAC__ASSERT_DECLARATION(off_t debug_target_offset = iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length;)
666 FLAC__ASSERT(0 != iterator);
667 FLAC__ASSERT(0 != iterator->file);
668 FLAC__ASSERT(0 != block);
670 if(!iterator->is_writable)
673 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) {
674 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
678 block->is_last = iterator->is_last;
681 /* first see if we can even use padding */
682 if(iterator->is_last) {
686 simple_iterator_push_(iterator);
687 if(!FLAC__metadata_simple_iterator_next(iterator)) {
688 (void)simple_iterator_pop_(iterator);
691 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
695 if(iterator->length == block->length) {
696 padding_leftover = 0;
697 block->is_last = iterator->is_last;
699 else if(iterator->length < FLAC__STREAM_METADATA_HEADER_LENGTH + block->length)
702 padding_leftover = iterator->length - block->length;
703 padding_is_last = iterator->is_last;
704 block->is_last = false;
707 if(!simple_iterator_pop_(iterator))
712 /* move to the next block, which is suitable padding */
713 if(!FLAC__metadata_simple_iterator_next(iterator))
715 if(padding_leftover == 0) {
716 ret = write_metadata_block_stationary_(iterator, block);
717 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
718 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
722 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
723 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
724 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
725 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
730 ret = rewrite_whole_file_(iterator, block, /*append=*/true);
731 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
732 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
737 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool use_padding)
739 FLAC__ASSERT_DECLARATION(off_t debug_target_offset = iterator->offset[iterator->depth];)
742 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO) {
743 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
748 FLAC__StreamMetadata *padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
750 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
753 padding->length = iterator->length;
754 if(!FLAC__metadata_simple_iterator_set_block(iterator, padding, false)) {
755 FLAC__metadata_object_delete(padding);
758 FLAC__metadata_object_delete(padding);
759 if(!FLAC__metadata_simple_iterator_prev(iterator))
761 FLAC__ASSERT(iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length == debug_target_offset);
762 FLAC__ASSERT(ftello(iterator->file) + (off_t)iterator->length == debug_target_offset);
766 ret = rewrite_whole_file_(iterator, 0, /*append=*/false);
767 FLAC__ASSERT(iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length == debug_target_offset);
768 FLAC__ASSERT(ftello(iterator->file) + (off_t)iterator->length == debug_target_offset);
775 /****************************************************************************
777 * Level 2 implementation
779 ***************************************************************************/
782 typedef struct FLAC__Metadata_Node {
783 FLAC__StreamMetadata *data;
784 struct FLAC__Metadata_Node *prev, *next;
785 } FLAC__Metadata_Node;
787 struct FLAC__Metadata_Chain {
788 char *filename; /* will be NULL if using callbacks */
789 FLAC__Metadata_Node *head;
790 FLAC__Metadata_Node *tail;
792 FLAC__Metadata_ChainStatus status;
793 off_t first_offset, last_offset;
795 * This is the length of the chain initially read from the FLAC file.
796 * it is used to compare against the current length to decide whether
797 * or not the whole file has to be rewritten.
799 off_t initial_length;
802 struct FLAC__Metadata_Iterator {
803 FLAC__Metadata_Chain *chain;
804 FLAC__Metadata_Node *current;
807 FLAC_API const char * const FLAC__Metadata_ChainStatusString[] = {
808 "FLAC__METADATA_CHAIN_STATUS_OK",
809 "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT",
810 "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE",
811 "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE",
812 "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE",
813 "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA",
814 "FLAC__METADATA_CHAIN_STATUS_READ_ERROR",
815 "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR",
816 "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR",
817 "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR",
818 "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR",
819 "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR",
820 "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR",
821 "FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS",
822 "FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH",
823 "FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL"
827 static FLAC__Metadata_Node *node_new_()
829 return (FLAC__Metadata_Node*)calloc(1, sizeof(FLAC__Metadata_Node));
832 static void node_delete_(FLAC__Metadata_Node *node)
834 FLAC__ASSERT(0 != node);
836 FLAC__metadata_object_delete(node->data);
840 static void chain_init_(FLAC__Metadata_Chain *chain)
842 FLAC__ASSERT(0 != chain);
845 chain->head = chain->tail = 0;
847 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
848 chain->initial_length = 0;
851 static void chain_clear_(FLAC__Metadata_Chain *chain)
853 FLAC__Metadata_Node *node, *next;
855 FLAC__ASSERT(0 != chain);
857 for(node = chain->head; node; ) {
863 if(0 != chain->filename)
864 free(chain->filename);
869 static void chain_append_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
871 FLAC__ASSERT(0 != chain);
872 FLAC__ASSERT(0 != node);
873 FLAC__ASSERT(0 != node->data);
875 node->next = node->prev = 0;
876 node->data->is_last = true;
878 chain->tail->data->is_last = false;
883 FLAC__ASSERT(0 != chain->tail);
884 chain->tail->next = node;
885 node->prev = chain->tail;
891 static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
893 FLAC__ASSERT(0 != chain);
894 FLAC__ASSERT(0 != node);
896 if(node == chain->head)
897 chain->head = node->next;
899 node->prev->next = node->next;
901 if(node == chain->tail)
902 chain->tail = node->prev;
904 node->next->prev = node->prev;
907 chain->tail->data->is_last = true;
912 static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
914 chain_remove_node_(chain, node);
918 static off_t chain_calculate_length_(FLAC__Metadata_Chain *chain)
920 const FLAC__Metadata_Node *node;
922 for(node = chain->head; node; node = node->next)
923 length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
927 static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
929 FLAC__ASSERT(0 != node);
930 FLAC__ASSERT(0 != node->data);
931 FLAC__ASSERT(0 != iterator);
932 FLAC__ASSERT(0 != iterator->current);
933 FLAC__ASSERT(0 != iterator->chain);
934 FLAC__ASSERT(0 != iterator->chain->head);
935 FLAC__ASSERT(0 != iterator->chain->tail);
937 node->data->is_last = false;
939 node->prev = iterator->current->prev;
940 node->next = iterator->current;
943 iterator->chain->head = node;
945 node->prev->next = node;
947 iterator->current->prev = node;
949 iterator->chain->nodes++;
952 static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
954 FLAC__ASSERT(0 != node);
955 FLAC__ASSERT(0 != node->data);
956 FLAC__ASSERT(0 != iterator);
957 FLAC__ASSERT(0 != iterator->current);
958 FLAC__ASSERT(0 != iterator->chain);
959 FLAC__ASSERT(0 != iterator->chain->head);
960 FLAC__ASSERT(0 != iterator->chain->tail);
962 iterator->current->data->is_last = false;
964 node->prev = iterator->current;
965 node->next = iterator->current->next;
968 iterator->chain->tail = node;
970 node->next->prev = node;
972 node->prev->next = node;
974 iterator->chain->tail->data->is_last = true;
976 iterator->chain->nodes++;
979 /* return true iff node and node->next are both padding */
980 static FLAC__bool chain_merge_adjacent_padding_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
982 if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) {
983 const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length;
984 node->data->length += growth;
986 chain_delete_node_(chain, node->next);
993 /* Returns the new length of the chain, or 0 if there was an error. */
994 /* WATCHOUT: This can get called multiple times before a write, so
995 * it should still work when this happens.
997 /* WATCHOUT: Make sure to also update the logic in
998 * FLAC__metadata_chain_check_if_tempfile_needed() if the logic here changes.
1000 static off_t chain_prepare_for_write_(FLAC__Metadata_Chain *chain, FLAC__bool use_padding)
1002 off_t current_length = chain_calculate_length_(chain);
1005 /* if the metadata shrank and the last block is padding, we just extend the last padding block */
1006 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1007 const off_t delta = chain->initial_length - current_length;
1008 chain->tail->data->length += delta;
1009 current_length += delta;
1010 FLAC__ASSERT(current_length == chain->initial_length);
1012 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */
1013 else if(current_length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
1014 FLAC__StreamMetadata *padding;
1015 FLAC__Metadata_Node *node;
1016 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) {
1017 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1020 padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + current_length);
1021 if(0 == (node = node_new_())) {
1022 FLAC__metadata_object_delete(padding);
1023 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1026 node->data = padding;
1027 chain_append_node_(chain, node);
1028 current_length = chain_calculate_length_(chain);
1029 FLAC__ASSERT(current_length == chain->initial_length);
1031 /* 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 */
1032 else if(current_length > chain->initial_length) {
1033 const off_t delta = current_length - chain->initial_length;
1034 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1035 /* if the delta is exactly the size of the last padding block, remove the padding block */
1036 if((off_t)chain->tail->data->length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH == delta) {
1037 chain_delete_node_(chain, chain->tail);
1038 current_length = chain_calculate_length_(chain);
1039 FLAC__ASSERT(current_length == chain->initial_length);
1041 /* if there is at least 'delta' bytes of padding, trim the padding down */
1042 else if((off_t)chain->tail->data->length >= delta) {
1043 chain->tail->data->length -= delta;
1044 current_length -= delta;
1045 FLAC__ASSERT(current_length == chain->initial_length);
1051 return current_length;
1054 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)
1056 FLAC__Metadata_Node *node;
1058 FLAC__ASSERT(0 != chain);
1060 /* we assume we're already at the beginning of the file */
1062 switch(seek_to_first_metadata_block_cb_(handle, read_cb, seek_cb)) {
1066 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1069 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1072 chain->status = FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
1080 FLAC__int64 pos = tell_cb(handle);
1082 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1085 chain->first_offset = (off_t)pos;
1090 FLAC__MetadataType type;
1096 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1100 if(!read_metadata_block_header_cb_(handle, read_cb, &is_last, &type, &length)) {
1101 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1105 node->data = FLAC__metadata_object_new(type);
1106 if(0 == node->data) {
1108 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1112 node->data->is_last = is_last;
1113 node->data->length = length;
1115 chain->status = get_equivalent_status_(read_metadata_block_data_cb_(handle, read_cb, seek_cb, node->data));
1116 if(chain->status != FLAC__METADATA_CHAIN_STATUS_OK) {
1120 chain_append_node_(chain, node);
1125 FLAC__int64 pos = tell_cb(handle);
1127 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1130 chain->last_offset = (off_t)pos;
1133 chain->initial_length = chain_calculate_length_(chain);
1138 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)
1140 FLAC__Metadata_Node *node;
1142 FLAC__ASSERT(0 != chain);
1143 FLAC__ASSERT(0 != chain->head);
1145 if(0 != seek_cb(handle, chain->first_offset, SEEK_SET)) {
1146 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1150 for(node = chain->head; node; node = node->next) {
1151 if(!write_metadata_block_header_cb_(handle, write_cb, node->data)) {
1152 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1155 if(!write_metadata_block_data_cb_(handle, write_cb, node->data)) {
1156 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1161 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1163 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
1167 static FLAC__bool chain_rewrite_metadata_in_place_(FLAC__Metadata_Chain *chain)
1172 FLAC__ASSERT(0 != chain->filename);
1174 if(0 == (file = fopen(chain->filename, "r+b"))) {
1175 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1179 /* chain_rewrite_metadata_in_place_cb_() sets chain->status for us */
1180 ret = chain_rewrite_metadata_in_place_cb_(chain, (FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, fseek_wrapper_);
1187 static FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix)
1191 FLAC__Metadata_SimpleIteratorStatus status;
1192 const FLAC__Metadata_Node *node;
1194 FLAC__ASSERT(0 != chain);
1195 FLAC__ASSERT(0 != chain->filename);
1196 FLAC__ASSERT(0 != chain->head);
1198 /* copy the file prefix (data up to first metadata block */
1199 if(0 == (f = fopen(chain->filename, "rb"))) {
1200 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1203 if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) {
1204 chain->status = get_equivalent_status_(status);
1205 cleanup_tempfile_(&tempfile, &tempfilename);
1208 if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) {
1209 chain->status = get_equivalent_status_(status);
1210 cleanup_tempfile_(&tempfile, &tempfilename);
1214 /* write the metadata */
1215 for(node = chain->head; node; node = node->next) {
1216 if(!write_metadata_block_header_(tempfile, &status, node->data)) {
1217 chain->status = get_equivalent_status_(status);
1220 if(!write_metadata_block_data_(tempfile, &status, node->data)) {
1221 chain->status = get_equivalent_status_(status);
1225 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1227 /* copy the file postfix (everything after the metadata) */
1228 if(0 != fseeko(f, chain->last_offset, SEEK_SET)) {
1229 cleanup_tempfile_(&tempfile, &tempfilename);
1230 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1233 if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) {
1234 cleanup_tempfile_(&tempfile, &tempfilename);
1235 chain->status = get_equivalent_status_(status);
1239 /* move the tempfile on top of the original */
1241 if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status))
1247 /* assumes 'handle' is already at beginning of file */
1248 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)
1250 FLAC__Metadata_SimpleIteratorStatus status;
1251 const FLAC__Metadata_Node *node;
1253 FLAC__ASSERT(0 != chain);
1254 FLAC__ASSERT(0 == chain->filename);
1255 FLAC__ASSERT(0 != chain->head);
1257 /* copy the file prefix (data up to first metadata block */
1258 if(!copy_n_bytes_from_file_cb_(handle, read_cb, temp_handle, temp_write_cb, chain->first_offset, &status)) {
1259 chain->status = get_equivalent_status_(status);
1263 /* write the metadata */
1264 for(node = chain->head; node; node = node->next) {
1265 if(!write_metadata_block_header_cb_(temp_handle, temp_write_cb, node->data)) {
1266 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1269 if(!write_metadata_block_data_cb_(temp_handle, temp_write_cb, node->data)) {
1270 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1274 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1276 /* copy the file postfix (everything after the metadata) */
1277 if(0 != seek_cb(handle, chain->last_offset, SEEK_SET)) {
1278 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1281 if(!copy_remaining_bytes_from_file_cb_(handle, read_cb, eof_cb, temp_handle, temp_write_cb, &status)) {
1282 chain->status = get_equivalent_status_(status);
1289 FLAC_API FLAC__Metadata_Chain *FLAC__metadata_chain_new()
1291 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)calloc(1, sizeof(FLAC__Metadata_Chain));
1299 FLAC_API void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain)
1301 FLAC__ASSERT(0 != chain);
1303 chain_clear_(chain);
1308 FLAC_API FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain)
1310 FLAC__Metadata_ChainStatus status;
1312 FLAC__ASSERT(0 != chain);
1314 status = chain->status;
1315 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
1319 FLAC_API FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename)
1324 FLAC__ASSERT(0 != chain);
1325 FLAC__ASSERT(0 != filename);
1327 chain_clear_(chain);
1329 if(0 == (chain->filename = strdup(filename))) {
1330 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1334 if(0 == (file = fopen(filename, "rb"))) {
1335 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1339 /* chain_read_cb_() sets chain->status for us */
1340 ret = chain_read_cb_(chain, file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, ftell_wrapper_);
1347 FLAC_API FLAC__bool FLAC__metadata_chain_read_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1349 FLAC__ASSERT(0 != chain);
1351 chain_clear_(chain);
1353 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.tell) {
1354 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1359 if(0 != callbacks.seek(handle, 0, SEEK_SET)) {
1360 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1364 if(!chain_read_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.tell))
1365 return false; /* chain->status is already set by chain_read_cb_ */
1370 FLAC_API FLAC__bool FLAC__metadata_chain_check_if_tempfile_needed(FLAC__Metadata_Chain *chain, FLAC__bool use_padding)
1372 /* This does all the same checks that are in chain_prepare_for_write_()
1373 * but doesn't actually alter the chain. Make sure to update the logic
1374 * here if chain_prepare_for_write_() changes.
1376 const off_t current_length = chain_calculate_length_(chain);
1378 FLAC__ASSERT(0 != chain);
1381 /* if the metadata shrank and the last block is padding, we just extend the last padding block */
1382 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING)
1384 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */
1385 else if(current_length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length)
1387 /* 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 */
1388 else if(current_length > chain->initial_length) {
1389 const off_t delta = current_length - chain->initial_length;
1390 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1391 /* if the delta is exactly the size of the last padding block, remove the padding block */
1392 if((off_t)chain->tail->data->length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH == delta)
1394 /* if there is at least 'delta' bytes of padding, trim the padding down */
1395 else if((off_t)chain->tail->data->length >= delta)
1401 return (current_length != chain->initial_length);
1404 FLAC_API FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats)
1407 const char *tempfile_path_prefix = 0;
1408 off_t current_length;
1410 FLAC__ASSERT(0 != chain);
1412 if (0 == chain->filename) {
1413 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1417 current_length = chain_prepare_for_write_(chain, use_padding);
1419 /* a return value of 0 means there was an error; chain->status is already set */
1420 if (0 == current_length)
1423 if(preserve_file_stats)
1424 get_file_stats_(chain->filename, &stats);
1426 if(current_length == chain->initial_length) {
1427 if(!chain_rewrite_metadata_in_place_(chain))
1431 if(!chain_rewrite_file_(chain, tempfile_path_prefix))
1434 /* recompute lengths and offsets */
1436 const FLAC__Metadata_Node *node;
1437 chain->initial_length = current_length;
1438 chain->last_offset = chain->first_offset;
1439 for(node = chain->head; node; node = node->next)
1440 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1444 if(preserve_file_stats)
1445 set_file_stats_(chain->filename, &stats);
1450 FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1452 off_t current_length;
1454 FLAC__ASSERT(0 != chain);
1456 if (0 != chain->filename) {
1457 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1461 if (0 == callbacks.write || 0 == callbacks.seek) {
1462 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1466 if (FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) {
1467 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL;
1471 current_length = chain_prepare_for_write_(chain, use_padding);
1473 /* a return value of 0 means there was an error; chain->status is already set */
1474 if (0 == current_length)
1477 FLAC__ASSERT(current_length == chain->initial_length);
1479 return chain_rewrite_metadata_in_place_cb_(chain, handle, callbacks.write, callbacks.seek);
1482 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)
1484 off_t current_length;
1486 FLAC__ASSERT(0 != chain);
1488 if (0 != chain->filename) {
1489 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1493 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.eof) {
1494 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1497 if (0 == temp_callbacks.write) {
1498 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1502 if (!FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) {
1503 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL;
1507 current_length = chain_prepare_for_write_(chain, use_padding);
1509 /* a return value of 0 means there was an error; chain->status is already set */
1510 if (0 == current_length)
1513 FLAC__ASSERT(current_length != chain->initial_length);
1516 if(0 != callbacks.seek(handle, 0, SEEK_SET)) {
1517 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1521 if(!chain_rewrite_file_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.eof, temp_handle, temp_callbacks.write))
1524 /* recompute lengths and offsets */
1526 const FLAC__Metadata_Node *node;
1527 chain->initial_length = current_length;
1528 chain->last_offset = chain->first_offset;
1529 for(node = chain->head; node; node = node->next)
1530 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1536 FLAC_API void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain)
1538 FLAC__Metadata_Node *node;
1540 FLAC__ASSERT(0 != chain);
1542 for(node = chain->head; node; ) {
1543 if(!chain_merge_adjacent_padding_(chain, node))
1548 FLAC_API void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain)
1550 FLAC__Metadata_Node *node, *save;
1553 FLAC__ASSERT(0 != chain);
1556 * Don't try and be too smart... this simple algo is good enough for
1557 * the small number of nodes that we deal with.
1559 for(i = 0, node = chain->head; i < chain->nodes; i++) {
1560 if(node->data->type == FLAC__METADATA_TYPE_PADDING) {
1562 chain_remove_node_(chain, node);
1563 chain_append_node_(chain, node);
1571 FLAC__metadata_chain_merge_padding(chain);
1575 FLAC_API FLAC__Metadata_Iterator *FLAC__metadata_iterator_new()
1577 FLAC__Metadata_Iterator *iterator = (FLAC__Metadata_Iterator*)calloc(1, sizeof(FLAC__Metadata_Iterator));
1579 /* calloc() implies:
1580 iterator->current = 0;
1581 iterator->chain = 0;
1587 FLAC_API void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator)
1589 FLAC__ASSERT(0 != iterator);
1594 FLAC_API void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain)
1596 FLAC__ASSERT(0 != iterator);
1597 FLAC__ASSERT(0 != chain);
1598 FLAC__ASSERT(0 != chain->head);
1600 iterator->chain = chain;
1601 iterator->current = chain->head;
1604 FLAC_API FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator)
1606 FLAC__ASSERT(0 != iterator);
1608 if(0 == iterator->current || 0 == iterator->current->next)
1611 iterator->current = iterator->current->next;
1615 FLAC_API FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator)
1617 FLAC__ASSERT(0 != iterator);
1619 if(0 == iterator->current || 0 == iterator->current->prev)
1622 iterator->current = iterator->current->prev;
1626 FLAC_API FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator)
1628 FLAC__ASSERT(0 != iterator);
1629 FLAC__ASSERT(0 != iterator->current);
1630 FLAC__ASSERT(0 != iterator->current->data);
1632 return iterator->current->data->type;
1635 FLAC_API FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator)
1637 FLAC__ASSERT(0 != iterator);
1638 FLAC__ASSERT(0 != iterator->current);
1640 return iterator->current->data;
1643 FLAC_API FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1645 FLAC__ASSERT(0 != iterator);
1646 FLAC__ASSERT(0 != block);
1647 return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block);
1650 FLAC_API FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding)
1652 FLAC__Metadata_Node *save;
1654 FLAC__ASSERT(0 != iterator);
1655 FLAC__ASSERT(0 != iterator->current);
1657 if(0 == iterator->current->prev) {
1658 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1662 save = iterator->current->prev;
1664 if(replace_with_padding) {
1665 FLAC__metadata_object_delete_data(iterator->current->data);
1666 iterator->current->data->type = FLAC__METADATA_TYPE_PADDING;
1669 chain_delete_node_(iterator->chain, iterator->current);
1672 iterator->current = save;
1676 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1678 FLAC__Metadata_Node *node;
1680 FLAC__ASSERT(0 != iterator);
1681 FLAC__ASSERT(0 != iterator->current);
1682 FLAC__ASSERT(0 != block);
1684 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1687 if(0 == iterator->current->prev) {
1688 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1692 if(0 == (node = node_new_()))
1696 iterator_insert_node_(iterator, node);
1697 iterator->current = node;
1701 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1703 FLAC__Metadata_Node *node;
1705 FLAC__ASSERT(0 != iterator);
1706 FLAC__ASSERT(0 != iterator->current);
1707 FLAC__ASSERT(0 != block);
1709 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1712 if(0 == (node = node_new_()))
1716 iterator_insert_node_after_(iterator, node);
1717 iterator->current = node;
1722 /****************************************************************************
1724 * Local function definitions
1726 ***************************************************************************/
1728 void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1734 for(i = 0; i < bytes; i++) {
1735 *(--b) = (FLAC__byte)(val & 0xff);
1740 void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1744 for(i = 0; i < bytes; i++) {
1745 *(b++) = (FLAC__byte)(val & 0xff);
1750 void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes)
1756 for(i = 0; i < bytes; i++) {
1757 *(--b) = (FLAC__byte)(val & 0xff);
1762 FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes)
1764 FLAC__uint32 ret = 0;
1767 for(i = 0; i < bytes; i++)
1768 ret = (ret << 8) | (FLAC__uint32)(*b++);
1773 FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes)
1775 FLAC__uint32 ret = 0;
1780 for(i = 0; i < bytes; i++)
1781 ret = (ret << 8) | (FLAC__uint32)(*--b);
1786 FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes)
1788 FLAC__uint64 ret = 0;
1791 for(i = 0; i < bytes; i++)
1792 ret = (ret << 8) | (FLAC__uint64)(*b++);
1797 FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator)
1799 FLAC__ASSERT(0 != iterator);
1800 FLAC__ASSERT(0 != iterator->file);
1802 if(!read_metadata_block_header_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, &iterator->is_last, &iterator->type, &iterator->length)) {
1803 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1810 FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block)
1812 FLAC__ASSERT(0 != iterator);
1813 FLAC__ASSERT(0 != iterator->file);
1815 iterator->status = read_metadata_block_data_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, block);
1817 return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1820 FLAC__bool read_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__bool *is_last, FLAC__MetadataType *type, unsigned *length)
1822 FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH];
1824 if(read_cb(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH)
1827 *is_last = raw_header[0] & 0x80? true : false;
1828 *type = (FLAC__MetadataType)(raw_header[0] & 0x7f);
1829 *length = unpack_uint32_(raw_header + 1, 3);
1831 /* Note that we don't check:
1832 * if(iterator->type >= FLAC__METADATA_TYPE_UNDEFINED)
1833 * we just will read in an opaque block
1839 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata *block)
1841 switch(block->type) {
1842 case FLAC__METADATA_TYPE_STREAMINFO:
1843 return read_metadata_block_data_streaminfo_cb_(handle, read_cb, &block->data.stream_info);
1844 case FLAC__METADATA_TYPE_PADDING:
1845 return read_metadata_block_data_padding_cb_(handle, seek_cb, &block->data.padding, block->length);
1846 case FLAC__METADATA_TYPE_APPLICATION:
1847 return read_metadata_block_data_application_cb_(handle, read_cb, &block->data.application, block->length);
1848 case FLAC__METADATA_TYPE_SEEKTABLE:
1849 return read_metadata_block_data_seektable_cb_(handle, read_cb, &block->data.seek_table, block->length);
1850 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1851 return read_metadata_block_data_vorbis_comment_cb_(handle, read_cb, &block->data.vorbis_comment);
1852 case FLAC__METADATA_TYPE_CUESHEET:
1853 return read_metadata_block_data_cuesheet_cb_(handle, read_cb, &block->data.cue_sheet);
1855 return read_metadata_block_data_unknown_cb_(handle, read_cb, &block->data.unknown, block->length);
1859 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block)
1861 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b;
1863 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1864 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1868 /* we are using hardcoded numbers for simplicity but we should
1869 * probably eventually write a bit-level unpacker and use the
1870 * _STREAMINFO_ constants.
1872 block->min_blocksize = unpack_uint32_(b, 2); b += 2;
1873 block->max_blocksize = unpack_uint32_(b, 2); b += 2;
1874 block->min_framesize = unpack_uint32_(b, 3); b += 3;
1875 block->max_framesize = unpack_uint32_(b, 3); b += 3;
1876 block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4);
1877 block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
1878 block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 4) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1;
1879 block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4);
1880 memcpy(block->md5sum, b+8, 16);
1882 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1886 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_Padding *block, unsigned block_length)
1888 (void)block; /* nothing to do; we don't care about reading the padding bytes */
1890 if(0 != seek_cb(handle, block_length, SEEK_CUR))
1891 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1893 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1896 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, unsigned block_length)
1898 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1900 if(read_cb(block->id, 1, id_bytes, handle) != id_bytes)
1901 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1903 block_length -= id_bytes;
1905 if(block_length == 0) {
1909 if(0 == (block->data = (FLAC__byte*)malloc(block_length)))
1910 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1912 if(read_cb(block->data, 1, block_length, handle) != block_length)
1913 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1916 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1919 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, unsigned block_length)
1922 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1924 FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0);
1926 block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1928 if(block->num_points == 0)
1930 else if(0 == (block->points = (FLAC__StreamMetadata_SeekPoint*)malloc(block->num_points * sizeof(FLAC__StreamMetadata_SeekPoint))))
1931 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1933 for(i = 0; i < block->num_points; i++) {
1934 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1935 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1936 /* some MAGIC NUMBERs here */
1937 block->points[i].sample_number = unpack_uint64_(buffer, 8);
1938 block->points[i].stream_offset = unpack_uint64_(buffer+8, 8);
1939 block->points[i].frame_samples = unpack_uint32_(buffer+16, 2);
1942 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1945 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment_Entry *entry)
1947 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1948 FLAC__byte buffer[4]; /* magic number is asserted below */
1950 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8 == 4);
1952 if(read_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
1953 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1954 entry->length = unpack_uint32_little_endian_(buffer, entry_length_len);
1956 if(0 != entry->entry)
1959 if(entry->length == 0) {
1963 if(0 == (entry->entry = (FLAC__byte*)malloc(entry->length+1)))
1964 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1966 if(read_cb(entry->entry, 1, entry->length, handle) != entry->length)
1967 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1969 entry->entry[entry->length] = '\0';
1972 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1975 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment *block)
1978 FLAC__Metadata_SimpleIteratorStatus status;
1979 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
1980 FLAC__byte buffer[4]; /* magic number is asserted below */
1982 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8 == 4);
1984 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, &(block->vendor_string))))
1987 if(read_cb(buffer, 1, num_comments_len, handle) != num_comments_len)
1988 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1989 block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len);
1991 if(block->num_comments == 0) {
1992 block->comments = 0;
1994 else if(0 == (block->comments = (FLAC__StreamMetadata_VorbisComment_Entry*)calloc(block->num_comments, sizeof(FLAC__StreamMetadata_VorbisComment_Entry))))
1995 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1997 for(i = 0; i < block->num_comments; i++) {
1998 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, block->comments + i)))
2002 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2005 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track)
2008 FLAC__byte buffer[32]; /* asserted below that this is big enough */
2010 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
2011 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
2012 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);
2014 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
2015 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
2016 if(read_cb(buffer, 1, len, handle) != len)
2017 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2018 track->offset = unpack_uint64_(buffer, len);
2020 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
2021 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
2022 if(read_cb(buffer, 1, len, handle) != len)
2023 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2024 track->number = (FLAC__byte)unpack_uint32_(buffer, len);
2026 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
2027 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
2028 if(read_cb(track->isrc, 1, len, handle) != len)
2029 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2031 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);
2032 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
2033 if(read_cb(buffer, 1, len, handle) != len)
2034 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2035 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN == 1);
2036 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN == 1);
2037 track->type = buffer[0] >> 7;
2038 track->pre_emphasis = (buffer[0] >> 6) & 1;
2040 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
2041 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
2042 if(read_cb(buffer, 1, len, handle) != len)
2043 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2044 track->num_indices = (FLAC__byte)unpack_uint32_(buffer, len);
2046 if(track->num_indices == 0) {
2049 else if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)calloc(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index))))
2050 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2052 for(i = 0; i < track->num_indices; i++) {
2053 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
2054 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
2055 if(read_cb(buffer, 1, len, handle) != len)
2056 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2057 track->indices[i].offset = unpack_uint64_(buffer, len);
2059 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
2060 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
2061 if(read_cb(buffer, 1, len, handle) != len)
2062 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2063 track->indices[i].number = (FLAC__byte)unpack_uint32_(buffer, len);
2065 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
2066 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
2067 if(read_cb(buffer, 1, len, handle) != len)
2068 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2071 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2074 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block)
2077 FLAC__Metadata_SimpleIteratorStatus status;
2078 FLAC__byte buffer[1024]; /* MSVC needs a constant expression so we put a magic number and assert */
2080 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN)/8 <= sizeof(buffer));
2081 FLAC__ASSERT(sizeof(FLAC__uint64) <= sizeof(buffer));
2083 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
2084 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
2085 if(read_cb(block->media_catalog_number, 1, len, handle) != len)
2086 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2088 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
2089 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
2090 if(read_cb(buffer, 1, len, handle) != len)
2091 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2092 block->lead_in = unpack_uint64_(buffer, len);
2094 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
2095 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
2096 if(read_cb(buffer, 1, len, handle) != len)
2097 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2098 block->is_cd = buffer[0]&0x80? true : false;
2100 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
2101 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
2102 if(read_cb(buffer, 1, len, handle) != len)
2103 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2104 block->num_tracks = unpack_uint32_(buffer, len);
2106 if(block->num_tracks == 0) {
2109 else if(0 == (block->tracks = (FLAC__StreamMetadata_CueSheet_Track*)calloc(block->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track))))
2110 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2112 for(i = 0; i < block->num_tracks; i++) {
2113 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_cuesheet_track_cb_(handle, read_cb, block->tracks + i)))
2117 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2120 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, unsigned block_length)
2122 if(block_length == 0) {
2126 if(0 == (block->data = (FLAC__byte*)malloc(block_length)))
2127 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2129 if(read_cb(block->data, 1, block_length, handle) != block_length)
2130 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2133 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2136 FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
2138 FLAC__ASSERT(0 != file);
2139 FLAC__ASSERT(0 != status);
2141 if(!write_metadata_block_header_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) {
2142 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2149 FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
2151 FLAC__ASSERT(0 != file);
2152 FLAC__ASSERT(0 != status);
2154 if (write_metadata_block_data_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) {
2155 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2159 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2164 FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block)
2166 FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH];
2168 FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
2170 buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type;
2171 pack_uint32_(block->length, buffer + 1, 3);
2173 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH)
2179 FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block)
2181 FLAC__ASSERT(0 != block);
2183 switch(block->type) {
2184 case FLAC__METADATA_TYPE_STREAMINFO:
2185 return write_metadata_block_data_streaminfo_cb_(handle, write_cb, &block->data.stream_info);
2186 case FLAC__METADATA_TYPE_PADDING:
2187 return write_metadata_block_data_padding_cb_(handle, write_cb, &block->data.padding, block->length);
2188 case FLAC__METADATA_TYPE_APPLICATION:
2189 return write_metadata_block_data_application_cb_(handle, write_cb, &block->data.application, block->length);
2190 case FLAC__METADATA_TYPE_SEEKTABLE:
2191 return write_metadata_block_data_seektable_cb_(handle, write_cb, &block->data.seek_table);
2192 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
2193 return write_metadata_block_data_vorbis_comment_cb_(handle, write_cb, &block->data.vorbis_comment);
2194 case FLAC__METADATA_TYPE_CUESHEET:
2195 return write_metadata_block_data_cuesheet_cb_(handle, write_cb, &block->data.cue_sheet);
2197 return write_metadata_block_data_unknown_cb_(handle, write_cb, &block->data.unknown, block->length);
2201 FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block)
2203 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH];
2204 const unsigned channels1 = block->channels - 1;
2205 const unsigned bps1 = block->bits_per_sample - 1;
2207 /* we are using hardcoded numbers for simplicity but we should
2208 * probably eventually write a bit-level packer and use the
2209 * _STREAMINFO_ constants.
2211 pack_uint32_(block->min_blocksize, buffer, 2);
2212 pack_uint32_(block->max_blocksize, buffer+2, 2);
2213 pack_uint32_(block->min_framesize, buffer+4, 3);
2214 pack_uint32_(block->max_framesize, buffer+7, 3);
2215 buffer[10] = (block->sample_rate >> 12) & 0xff;
2216 buffer[11] = (block->sample_rate >> 4) & 0xff;
2217 buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4);
2218 buffer[13] = (FLAC__byte)(((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f));
2219 pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4);
2220 memcpy(buffer+18, block->md5sum, 16);
2222 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
2228 FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, unsigned block_length)
2230 unsigned i, n = block_length;
2231 FLAC__byte buffer[1024];
2235 memset(buffer, 0, 1024);
2237 for(i = 0; i < n/1024; i++)
2238 if(write_cb(buffer, 1, 1024, handle) != 1024)
2243 if(write_cb(buffer, 1, n, handle) != n)
2249 FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, unsigned block_length)
2251 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
2253 if(write_cb(block->id, 1, id_bytes, handle) != id_bytes)
2256 block_length -= id_bytes;
2258 if(write_cb(block->data, 1, block_length, handle) != block_length)
2264 FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block)
2267 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
2269 for(i = 0; i < block->num_points; i++) {
2270 /* some MAGIC NUMBERs here */
2271 pack_uint64_(block->points[i].sample_number, buffer, 8);
2272 pack_uint64_(block->points[i].stream_offset, buffer+8, 8);
2273 pack_uint32_(block->points[i].frame_samples, buffer+16, 2);
2274 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
2281 FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block)
2284 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
2285 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
2286 FLAC__byte buffer[4]; /* magic number is asserted below */
2288 FLAC__ASSERT(max(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8 == 4);
2290 pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len);
2291 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2293 if(write_cb(block->vendor_string.entry, 1, block->vendor_string.length, handle) != block->vendor_string.length)
2296 pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len);
2297 if(write_cb(buffer, 1, num_comments_len, handle) != num_comments_len)
2300 for(i = 0; i < block->num_comments; i++) {
2301 pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len);
2302 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2304 if(write_cb(block->comments[i].entry, 1, block->comments[i].length, handle) != block->comments[i].length)
2311 FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block)
2314 FLAC__byte buffer[1024]; /* asserted below that this is big enough */
2316 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
2317 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN/8);
2318 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);
2319 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
2321 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
2322 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
2323 if(write_cb(block->media_catalog_number, 1, len, handle) != len)
2326 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
2327 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
2328 pack_uint64_(block->lead_in, buffer, len);
2329 if(write_cb(buffer, 1, len, handle) != len)
2332 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
2333 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
2334 memset(buffer, 0, len);
2337 if(write_cb(buffer, 1, len, handle) != len)
2340 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
2341 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
2342 pack_uint32_(block->num_tracks, buffer, len);
2343 if(write_cb(buffer, 1, len, handle) != len)
2346 for(i = 0; i < block->num_tracks; i++) {
2347 FLAC__StreamMetadata_CueSheet_Track *track = block->tracks + i;
2349 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
2350 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
2351 pack_uint64_(track->offset, buffer, len);
2352 if(write_cb(buffer, 1, len, handle) != len)
2355 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
2356 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
2357 pack_uint32_(track->number, buffer, len);
2358 if(write_cb(buffer, 1, len, handle) != len)
2361 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
2362 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
2363 if(write_cb(track->isrc, 1, len, handle) != len)
2366 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);
2367 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
2368 memset(buffer, 0, len);
2369 buffer[0] = (track->type << 7) | (track->pre_emphasis << 6);
2370 if(write_cb(buffer, 1, len, handle) != len)
2373 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
2374 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
2375 pack_uint32_(track->num_indices, buffer, len);
2376 if(write_cb(buffer, 1, len, handle) != len)
2379 for(j = 0; j < track->num_indices; j++) {
2380 FLAC__StreamMetadata_CueSheet_Index *index = track->indices + j;
2382 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
2383 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
2384 pack_uint64_(index->offset, buffer, len);
2385 if(write_cb(buffer, 1, len, handle) != len)
2388 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
2389 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
2390 pack_uint32_(index->number, buffer, len);
2391 if(write_cb(buffer, 1, len, handle) != len)
2394 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
2395 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
2396 memset(buffer, 0, len);
2397 if(write_cb(buffer, 1, len, handle) != len)
2405 FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, unsigned block_length)
2407 if(write_cb(block->data, 1, block_length, handle) != block_length)
2413 FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block)
2415 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2416 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2420 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
2423 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
2426 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2427 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2431 return read_metadata_block_header_(iterator);
2434 FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last)
2436 FLAC__StreamMetadata *padding;
2438 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2439 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2443 block->is_last = false;
2445 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
2448 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
2451 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)))
2452 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2454 padding->is_last = padding_is_last;
2455 padding->length = padding_length;
2457 if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) {
2458 FLAC__metadata_object_delete(padding);
2462 if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) {
2463 FLAC__metadata_object_delete(padding);
2467 FLAC__metadata_object_delete(padding);
2469 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2470 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2474 return read_metadata_block_header_(iterator);
2477 FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append)
2481 int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */
2482 off_t fixup_is_last_flag_offset = -1;
2484 FLAC__ASSERT(0 != block || append == false);
2486 if(iterator->is_last) {
2488 fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */
2489 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2491 else if(0 == block) {
2492 simple_iterator_push_(iterator);
2493 if(!FLAC__metadata_simple_iterator_prev(iterator)) {
2494 (void)simple_iterator_pop_(iterator);
2497 fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */
2498 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2499 if(!simple_iterator_pop_(iterator))
2504 if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append))
2508 if(!write_metadata_block_header_(tempfile, &iterator->status, block)) {
2509 cleanup_tempfile_(&tempfile, &tempfilename);
2513 if(!write_metadata_block_data_(tempfile, &iterator->status, block)) {
2514 cleanup_tempfile_(&tempfile, &tempfilename);
2519 if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0))
2523 return FLAC__metadata_simple_iterator_next(iterator);
2528 void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator)
2530 FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH);
2531 iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth];
2535 FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator)
2537 FLAC__ASSERT(iterator->depth > 0);
2539 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2540 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2544 return read_metadata_block_header_(iterator);
2551 * 3: not a FLAC file
2553 unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb)
2555 FLAC__byte buffer[4];
2559 FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == 4);
2561 /* skip any id3v2 tag */
2563 n = read_cb(buffer, 1, 4, handle);
2568 else if(0 == memcmp(buffer, "ID3", 3)) {
2569 unsigned tag_length = 0;
2571 /* skip to the tag length */
2572 if(seek_cb(handle, 2, SEEK_CUR) < 0)
2575 /* read the length */
2576 for(i = 0; i < 4; i++) {
2577 if(read_cb(buffer, 1, 1, handle) < 1 || buffer[0] & 0x80)
2580 tag_length |= (buffer[0] & 0x7f);
2583 /* skip the rest of the tag */
2584 if(seek_cb(handle, tag_length, SEEK_CUR) < 0)
2587 /* read the stream sync code */
2589 n = read_cb(buffer, 1, 4, handle);
2596 /* check for the fLaC signature */
2597 if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH))
2603 unsigned seek_to_first_metadata_block_(FILE *f)
2605 return seek_to_first_metadata_block_cb_((FLAC__IOHandle)f, (FLAC__IOCallback_Read)fread, fseek_wrapper_);
2608 FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append)
2610 const off_t offset_end = append? iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length : iterator->offset[iterator->depth];
2612 if(0 != fseeko(iterator->file, 0, SEEK_SET)) {
2613 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2616 if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) {
2617 cleanup_tempfile_(tempfile, tempfilename);
2620 if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) {
2621 cleanup_tempfile_(tempfile, tempfilename);
2628 FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, off_t fixup_is_last_flag_offset, FLAC__bool backup)
2630 off_t save_offset = iterator->offset[iterator->depth];
2631 FLAC__ASSERT(0 != *tempfile);
2633 if(0 != fseeko(iterator->file, save_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length, SEEK_SET)) {
2634 cleanup_tempfile_(tempfile, tempfilename);
2635 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2638 if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) {
2639 cleanup_tempfile_(tempfile, tempfilename);
2643 if(fixup_is_last_code != 0) {
2645 * if code == 1, it means a block was appended to the end so
2646 * we have to clear the is_last flag of the previous block
2647 * if code == -1, it means the last block was deleted so
2648 * we have to set the is_last flag of the previous block
2650 /* MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */
2652 if(0 != fseeko(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2653 cleanup_tempfile_(tempfile, tempfilename);
2654 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2657 if(fread(&x, 1, 1, *tempfile) != 1) {
2658 cleanup_tempfile_(tempfile, tempfilename);
2659 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2662 if(fixup_is_last_code > 0) {
2663 FLAC__ASSERT(x & 0x80);
2667 FLAC__ASSERT(!(x & 0x80));
2670 if(0 != fseeko(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2671 cleanup_tempfile_(tempfile, tempfilename);
2672 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2675 if(local__fwrite(&x, 1, 1, *tempfile) != 1) {
2676 cleanup_tempfile_(tempfile, tempfilename);
2677 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2682 (void)fclose(iterator->file);
2684 if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status))
2687 if(iterator->has_stats)
2688 set_file_stats_(iterator->filename, &iterator->stats);
2690 if(!simple_iterator_prime_input_(iterator, !iterator->is_writable))
2693 while(iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length < save_offset)
2694 if(!FLAC__metadata_simple_iterator_next(iterator))
2699 /* move the iterator to it's original block faster by faking a push, then doing a pop_ */
2700 FLAC__ASSERT(iterator->depth == 0);
2701 iterator->offset[0] = save_offset;
2703 return simple_iterator_pop_(iterator);
2707 FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status)
2709 FLAC__byte buffer[8192];
2713 n = min(sizeof(buffer), bytes);
2714 if(fread(buffer, 1, n, file) != n) {
2715 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2718 if(local__fwrite(buffer, 1, n, tempfile) != n) {
2719 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2728 FLAC__bool copy_n_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status)
2730 FLAC__byte buffer[8192];
2734 n = min(sizeof(buffer), bytes);
2735 if(read_cb(buffer, 1, n, handle) != n) {
2736 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2739 if(temp_write_cb(buffer, 1, n, temp_handle) != n) {
2740 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2749 FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status)
2751 FLAC__byte buffer[8192];
2754 while(!feof(file)) {
2755 n = fread(buffer, 1, sizeof(buffer), file);
2756 if(n == 0 && !feof(file)) {
2757 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2760 if(n > 0 && local__fwrite(buffer, 1, n, tempfile) != n) {
2761 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2769 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)
2771 FLAC__byte buffer[8192];
2774 while(!eof_cb(handle)) {
2775 n = read_cb(buffer, 1, sizeof(buffer), handle);
2776 if(n == 0 && !eof_cb(handle)) {
2777 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2780 if(n > 0 && temp_write_cb(buffer, 1, n, temp_handle) != n) {
2781 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2789 FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
2791 static const char *tempfile_suffix = ".metadata_edit";
2792 if(0 == tempfile_path_prefix) {
2793 if(0 == (*tempfilename = (char*)malloc(strlen(filename) + strlen(tempfile_suffix) + 1))) {
2794 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2797 strcpy(*tempfilename, filename);
2798 strcat(*tempfilename, tempfile_suffix);
2801 const char *p = strrchr(filename, '/');
2807 if(0 == (*tempfilename = (char*)malloc(strlen(tempfile_path_prefix) + 1 + strlen(p) + strlen(tempfile_suffix) + 1))) {
2808 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2811 strcpy(*tempfilename, tempfile_path_prefix);
2812 strcat(*tempfilename, "/");
2813 strcat(*tempfilename, p);
2814 strcat(*tempfilename, tempfile_suffix);
2817 if(0 == (*tempfile = fopen(*tempfilename, "w+b"))) {
2818 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
2825 FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
2827 FLAC__ASSERT(0 != filename);
2828 FLAC__ASSERT(0 != tempfile);
2829 FLAC__ASSERT(0 != *tempfile);
2830 FLAC__ASSERT(0 != tempfilename);
2831 FLAC__ASSERT(0 != *tempfilename);
2832 FLAC__ASSERT(0 != status);
2834 (void)fclose(*tempfile);
2837 #if defined _MSC_VER || defined __MINGW32__ || defined __EMX__
2838 /* on some flavors of windows, rename() will fail if the destination already exists */
2839 if(unlink(filename) < 0) {
2840 cleanup_tempfile_(tempfile, tempfilename);
2841 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR;
2846 /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just rename(): */
2847 if(0 != rename(*tempfilename, filename)) {
2848 cleanup_tempfile_(tempfile, tempfilename);
2849 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR;
2853 cleanup_tempfile_(tempfile, tempfilename);
2858 void cleanup_tempfile_(FILE **tempfile, char **tempfilename)
2860 if(0 != *tempfile) {
2861 (void)fclose(*tempfile);
2865 if(0 != *tempfilename) {
2866 (void)unlink(*tempfilename);
2867 free(*tempfilename);
2872 FLAC__bool get_file_stats_(const char *filename, struct stat *stats)
2874 FLAC__ASSERT(0 != filename);
2875 FLAC__ASSERT(0 != stats);
2876 return (0 == stat(filename, stats));
2879 void set_file_stats_(const char *filename, struct stat *stats)
2881 struct utimbuf srctime;
2883 FLAC__ASSERT(0 != filename);
2884 FLAC__ASSERT(0 != stats);
2886 srctime.actime = stats->st_atime;
2887 srctime.modtime = stats->st_mtime;
2888 (void)chmod(filename, stats->st_mode);
2889 (void)utime(filename, &srctime);
2890 #if !defined _MSC_VER && !defined __MINGW32__ && !defined __EMX__
2891 (void)chown(filename, stats->st_uid, -1);
2892 (void)chown(filename, -1, stats->st_gid);
2896 int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence)
2898 return fseeko((FILE*)handle, (off_t)offset, whence);
2901 FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle)
2903 return ftello((FILE*)handle);
2906 FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status)
2909 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK:
2910 return FLAC__METADATA_CHAIN_STATUS_OK;
2911 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT:
2912 return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT;
2913 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE:
2914 return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
2915 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE:
2916 return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
2917 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE:
2918 return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE;
2919 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA:
2920 return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA;
2921 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR:
2922 return FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
2923 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR:
2924 return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
2925 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR:
2926 return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
2927 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR:
2928 return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR;
2929 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR:
2930 return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR;
2931 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR:
2932 return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
2933 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR:
2935 return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;