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.
37 #if defined _MSC_VER || defined __MINGW32__
38 #include <sys/utime.h> /* for utime() */
39 #include <io.h> /* for chmod() */
41 #include <sys/types.h> /* some flavors of BSD (like OS X) require this to get time_t */
42 #include <utime.h> /* for utime() */
43 #include <unistd.h> /* for chown(), unlink() */
45 #include <sys/stat.h> /* for stat(), maybe chmod() */
47 #include "private/metadata.h"
49 #include "FLAC/assert.h"
50 #include "FLAC/file_decoder.h"
55 #define max(a,b) ((a)>(b)?(a):(b))
59 #define min(a,b) ((a)<(b)?(a):(b))
62 /****************************************************************************
64 * Local function declarations
66 ***************************************************************************/
68 static void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
69 static void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
70 static void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes);
71 static FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes);
72 static FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes);
73 static FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes);
75 static FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator);
76 static FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block);
77 static FLAC__bool read_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__bool *is_last, FLAC__MetadataType *type, unsigned *length);
78 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata *block);
79 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block);
80 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_Padding *block, unsigned block_length);
81 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, unsigned block_length);
82 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, unsigned block_length);
83 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment_Entry *entry);
84 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment *block);
85 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track);
86 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block);
87 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, unsigned block_length);
89 static FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
90 static FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
91 static FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block);
92 static FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block);
93 static FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block);
94 static FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, unsigned block_length);
95 static FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, unsigned block_length);
96 static FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block);
97 static FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block);
98 static FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block);
99 static FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, unsigned block_length);
101 static FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block);
102 static FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last);
103 static FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append);
105 static void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator);
106 static FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator);
108 static unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb);
109 static unsigned seek_to_first_metadata_block_(FILE *f);
111 static FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append);
112 static FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, long fixup_is_last_flag_offset, FLAC__bool backup);
114 static FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, unsigned bytes/*@@@ 4G limit*/, FLAC__Metadata_SimpleIteratorStatus *status);
115 static FLAC__bool copy_n_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, unsigned bytes/*@@@ 4G limit*/, FLAC__Metadata_SimpleIteratorStatus *status);
116 static FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status);
117 static FLAC__bool copy_remaining_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Eof eof_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__Metadata_SimpleIteratorStatus *status);
119 static FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
120 static FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
121 static void cleanup_tempfile_(FILE **tempfile, char **tempfilename);
123 static FLAC__bool get_file_stats_(const char *filename, struct stat *stats);
124 static void set_file_stats_(const char *filename, struct stat *stats);
126 static int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence);
127 static FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle);
129 static FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status);
132 #ifdef FLAC__VALGRIND_TESTING
133 static size_t local__fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
135 size_t ret = fwrite(ptr, size, nmemb, stream);
141 #define local__fwrite fwrite
144 /****************************************************************************
146 * Level 0 implementation
148 ***************************************************************************/
150 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
151 static void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
152 static void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
155 FLAC__bool got_error;
156 FLAC__StreamMetadata *object;
157 } level0_client_data;
159 static FLAC__StreamMetadata *get_one_metadata_block_(const char *filename, FLAC__MetadataType type)
161 level0_client_data cd;
162 FLAC__FileDecoder *decoder;
164 FLAC__ASSERT(0 != filename);
166 cd.got_error = false;
169 decoder = FLAC__file_decoder_new();
174 FLAC__file_decoder_set_md5_checking(decoder, false);
175 FLAC__file_decoder_set_filename(decoder, filename);
176 FLAC__file_decoder_set_metadata_ignore_all(decoder);
177 FLAC__file_decoder_set_metadata_respond(decoder, type);
178 FLAC__file_decoder_set_write_callback(decoder, write_callback_);
179 FLAC__file_decoder_set_metadata_callback(decoder, metadata_callback_);
180 FLAC__file_decoder_set_error_callback(decoder, error_callback_);
181 FLAC__file_decoder_set_client_data(decoder, &cd);
183 if(FLAC__file_decoder_init(decoder) != FLAC__FILE_DECODER_OK || cd.got_error) {
184 FLAC__file_decoder_finish(decoder);
185 FLAC__file_decoder_delete(decoder);
189 if(!FLAC__file_decoder_process_until_end_of_metadata(decoder) || cd.got_error) {
190 FLAC__file_decoder_finish(decoder);
191 FLAC__file_decoder_delete(decoder);
193 FLAC__metadata_object_delete(cd.object);
197 FLAC__file_decoder_finish(decoder);
198 FLAC__file_decoder_delete(decoder);
203 FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo)
205 FLAC__StreamMetadata *object;
207 FLAC__ASSERT(0 != filename);
208 FLAC__ASSERT(0 != streaminfo);
210 object = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_STREAMINFO);
213 /* can just copy the contents since STREAMINFO has no internal structure */
214 *streaminfo = *object;
215 FLAC__metadata_object_delete(object);
223 FLAC_API FLAC__bool FLAC__metadata_get_tags(const char *filename, FLAC__StreamMetadata **tags)
225 FLAC__ASSERT(0 != filename);
226 FLAC__ASSERT(0 != tags);
228 *tags = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_VORBIS_COMMENT);
233 FLAC_API FLAC__bool FLAC__metadata_get_cuesheet(const char *filename, FLAC__StreamMetadata **cuesheet)
235 FLAC__ASSERT(0 != filename);
236 FLAC__ASSERT(0 != cuesheet);
238 *cuesheet = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_CUESHEET);
240 return 0 != *cuesheet;
243 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
245 (void)decoder, (void)frame, (void)buffer, (void)client_data;
247 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
250 void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
252 level0_client_data *cd = (level0_client_data *)client_data;
256 * we assume we only get here when the one metadata block we were
257 * looking for was passed to us
259 if(!cd->got_error && 0 == cd->object) {
260 if(0 == (cd->object = FLAC__metadata_object_clone(metadata)))
261 cd->got_error = true;
265 void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
267 level0_client_data *cd = (level0_client_data *)client_data;
270 if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
271 cd->got_error = true;
275 /****************************************************************************
277 * Level 1 implementation
279 ***************************************************************************/
281 #define SIMPLE_ITERATOR_MAX_PUSH_DEPTH (1+4)
282 /* 1 for initial offset, +4 for our own personal use */
284 struct FLAC__Metadata_SimpleIterator {
286 char *filename, *tempfile_path_prefix;
288 FLAC__bool has_stats;
289 FLAC__bool is_writable;
290 FLAC__Metadata_SimpleIteratorStatus status;
291 /*@@@ 2G limits here because of the offset type: */
292 long offset[SIMPLE_ITERATOR_MAX_PUSH_DEPTH];
293 long first_offset; /* this is the offset to the STREAMINFO block */
295 /* this is the metadata block header of the current block we are pointing to: */
297 FLAC__MetadataType type;
301 FLAC_API const char * const FLAC__Metadata_SimpleIteratorStatusString[] = {
302 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK",
303 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT",
304 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE",
305 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE",
306 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE",
307 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA",
308 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR",
309 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR",
310 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR",
311 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR",
312 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR",
313 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR",
314 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR"
318 FLAC_API FLAC__Metadata_SimpleIterator *FLAC__metadata_simple_iterator_new()
320 FLAC__Metadata_SimpleIterator *iterator = (FLAC__Metadata_SimpleIterator*)calloc(1, sizeof(FLAC__Metadata_SimpleIterator));
324 iterator->filename = 0;
325 iterator->tempfile_path_prefix = 0;
326 iterator->has_stats = false;
327 iterator->is_writable = false;
328 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
329 iterator->first_offset = iterator->offset[0] = -1;
336 static void simple_iterator_free_guts_(FLAC__Metadata_SimpleIterator *iterator)
338 FLAC__ASSERT(0 != iterator);
340 if(0 != iterator->file) {
341 fclose(iterator->file);
343 if(iterator->has_stats)
344 set_file_stats_(iterator->filename, &iterator->stats);
346 if(0 != iterator->filename) {
347 free(iterator->filename);
348 iterator->filename = 0;
350 if(0 != iterator->tempfile_path_prefix) {
351 free(iterator->tempfile_path_prefix);
352 iterator->tempfile_path_prefix = 0;
356 FLAC_API void FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator *iterator)
358 FLAC__ASSERT(0 != iterator);
360 simple_iterator_free_guts_(iterator);
364 FLAC_API FLAC__Metadata_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator *iterator)
366 FLAC__Metadata_SimpleIteratorStatus status;
368 FLAC__ASSERT(0 != iterator);
370 status = iterator->status;
371 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
375 static FLAC__bool simple_iterator_prime_input_(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool read_only)
379 FLAC__ASSERT(0 != iterator);
381 if(read_only || 0 == (iterator->file = fopen(iterator->filename, "r+b"))) {
382 iterator->is_writable = false;
383 if(read_only || errno == EACCES) {
384 if(0 == (iterator->file = fopen(iterator->filename, "rb"))) {
385 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
390 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
395 iterator->is_writable = true;
398 ret = seek_to_first_metadata_block_(iterator->file);
402 iterator->first_offset = iterator->offset[iterator->depth] = ftell(iterator->file);
403 return read_metadata_block_header_(iterator);
405 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
408 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
411 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE;
420 @@@ If we decide to finish implementing this, put this comment back in metadata.h
422 * The 'tempfile_path_prefix' allows you to specify a directory where
423 * tempfiles should go. Remember that if your metadata edits cause the
424 * FLAC file to grow, the entire file will have to be rewritten. If
425 * 'tempfile_path_prefix' is NULL, the temp file will be written in the
426 * same directory as the original FLAC file. This makes replacing the
427 * original with the tempfile fast but requires extra space in the same
428 * partition for the tempfile. If space is a problem, you can pass a
429 * directory name belonging to a different partition in
430 * 'tempfile_path_prefix'. Note that you should use the forward slash
431 * '/' as the directory separator. A trailing slash is not needed; it
432 * will be added automatically.
434 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats, const char *tempfile_path_prefix);
437 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)
439 const char *tempfile_path_prefix = 0; /*@@@ search for comments near 'rename(...)' for what it will take to finish implementing this */
441 FLAC__ASSERT(0 != iterator);
442 FLAC__ASSERT(0 != filename);
444 simple_iterator_free_guts_(iterator);
446 if(!read_only && preserve_file_stats)
447 iterator->has_stats = get_file_stats_(filename, &iterator->stats);
449 if(0 == (iterator->filename = strdup(filename))) {
450 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
453 if(0 != tempfile_path_prefix && 0 == (iterator->tempfile_path_prefix = strdup(tempfile_path_prefix))) {
454 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
458 return simple_iterator_prime_input_(iterator, read_only);
461 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator *iterator)
463 FLAC__ASSERT(0 != iterator);
464 FLAC__ASSERT(0 != iterator->file);
466 return iterator->is_writable;
469 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator *iterator)
471 FLAC__ASSERT(0 != iterator);
472 FLAC__ASSERT(0 != iterator->file);
474 if(iterator->is_last)
477 if(0 != fseek(iterator->file, iterator->length, SEEK_CUR)) {
478 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
482 iterator->offset[iterator->depth] = ftell(iterator->file);
484 return read_metadata_block_header_(iterator);
487 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator *iterator)
491 FLAC__ASSERT(0 != iterator);
492 FLAC__ASSERT(0 != iterator->file);
494 if(iterator->offset[iterator->depth] == iterator->first_offset)
497 if(0 != fseek(iterator->file, iterator->first_offset, SEEK_SET)) {
498 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
501 this_offset = iterator->first_offset;
502 if(!read_metadata_block_header_(iterator))
505 /* we ignore any error from ftell() and catch it in fseek() */
506 while(ftell(iterator->file) + (long)iterator->length < iterator->offset[iterator->depth]) {
507 if(0 != fseek(iterator->file, iterator->length, SEEK_CUR)) {
508 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
511 this_offset = ftell(iterator->file);
512 if(!read_metadata_block_header_(iterator))
516 iterator->offset[iterator->depth] = this_offset;
521 FLAC_API FLAC__MetadataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator *iterator)
523 FLAC__ASSERT(0 != iterator);
524 FLAC__ASSERT(0 != iterator->file);
526 return iterator->type;
529 FLAC_API FLAC__StreamMetadata *FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator *iterator)
531 FLAC__StreamMetadata *block = FLAC__metadata_object_new(iterator->type);
533 FLAC__ASSERT(0 != iterator);
534 FLAC__ASSERT(0 != iterator->file);
537 block->is_last = iterator->is_last;
538 block->length = iterator->length;
540 if(!read_metadata_block_data_(iterator, block)) {
541 FLAC__metadata_object_delete(block);
545 /* back up to the beginning of the block data to stay consistent */
546 if(0 != fseek(iterator->file, iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH, SEEK_SET)) {
547 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
548 FLAC__metadata_object_delete(block);
553 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
558 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
560 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth];)
563 FLAC__ASSERT(0 != iterator);
564 FLAC__ASSERT(0 != iterator->file);
565 FLAC__ASSERT(0 != block);
567 if(!iterator->is_writable) {
568 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE;
572 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO || block->type == FLAC__METADATA_TYPE_STREAMINFO) {
573 if(iterator->type != block->type) {
574 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
579 block->is_last = iterator->is_last;
581 if(iterator->length == block->length)
582 return write_metadata_block_stationary_(iterator, block);
583 else if(iterator->length > block->length) {
584 if(use_padding && iterator->length >= FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) {
585 ret = write_metadata_block_stationary_with_padding_(iterator, block, iterator->length - FLAC__STREAM_METADATA_HEADER_LENGTH - block->length, block->is_last);
586 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
587 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
591 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
592 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
593 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
597 else /* iterator->length < block->length */ {
598 unsigned padding_leftover = 0;
599 FLAC__bool padding_is_last = false;
601 /* first see if we can even use padding */
602 if(iterator->is_last) {
606 const unsigned extra_padding_bytes_required = block->length - iterator->length;
607 simple_iterator_push_(iterator);
608 if(!FLAC__metadata_simple_iterator_next(iterator)) {
609 (void)simple_iterator_pop_(iterator);
612 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
616 if(FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length == extra_padding_bytes_required) {
617 padding_leftover = 0;
618 block->is_last = iterator->is_last;
620 else if(iterator->length < extra_padding_bytes_required)
623 padding_leftover = FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length - extra_padding_bytes_required;
624 padding_is_last = iterator->is_last;
625 block->is_last = false;
628 if(!simple_iterator_pop_(iterator))
633 if(padding_leftover == 0) {
634 ret = write_metadata_block_stationary_(iterator, block);
635 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
636 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
640 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
641 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
642 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
643 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
648 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
649 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
650 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
656 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
658 unsigned padding_leftover = 0;
659 FLAC__bool padding_is_last = false;
661 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length;)
664 FLAC__ASSERT(0 != iterator);
665 FLAC__ASSERT(0 != iterator->file);
666 FLAC__ASSERT(0 != block);
668 if(!iterator->is_writable)
671 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) {
672 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
676 block->is_last = iterator->is_last;
679 /* first see if we can even use padding */
680 if(iterator->is_last) {
684 simple_iterator_push_(iterator);
685 if(!FLAC__metadata_simple_iterator_next(iterator)) {
686 (void)simple_iterator_pop_(iterator);
689 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
693 if(iterator->length == block->length) {
694 padding_leftover = 0;
695 block->is_last = iterator->is_last;
697 else if(iterator->length < FLAC__STREAM_METADATA_HEADER_LENGTH + block->length)
700 padding_leftover = iterator->length - block->length;
701 padding_is_last = iterator->is_last;
702 block->is_last = false;
705 if(!simple_iterator_pop_(iterator))
710 /* move to the next block, which is suitable padding */
711 if(!FLAC__metadata_simple_iterator_next(iterator))
713 if(padding_leftover == 0) {
714 ret = write_metadata_block_stationary_(iterator, block);
715 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
716 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
720 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
721 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
722 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
723 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
728 ret = rewrite_whole_file_(iterator, block, /*append=*/true);
729 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
730 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
735 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool use_padding)
737 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth];)
740 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO) {
741 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
746 FLAC__StreamMetadata *padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
748 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
751 padding->length = iterator->length;
752 if(!FLAC__metadata_simple_iterator_set_block(iterator, padding, false)) {
753 FLAC__metadata_object_delete(padding);
756 FLAC__metadata_object_delete(padding);
757 if(!FLAC__metadata_simple_iterator_prev(iterator))
759 FLAC__ASSERT(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length == debug_target_offset);
760 FLAC__ASSERT(ftell(iterator->file) + (long)iterator->length == debug_target_offset);
764 ret = rewrite_whole_file_(iterator, 0, /*append=*/false);
765 FLAC__ASSERT(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length == debug_target_offset);
766 FLAC__ASSERT(ftell(iterator->file) + (long)iterator->length == debug_target_offset);
773 /****************************************************************************
775 * Level 2 implementation
777 ***************************************************************************/
780 typedef struct FLAC__Metadata_Node {
781 FLAC__StreamMetadata *data;
782 struct FLAC__Metadata_Node *prev, *next;
783 } FLAC__Metadata_Node;
785 struct FLAC__Metadata_Chain {
786 char *filename; /* will be NULL if using callbacks */
787 FLAC__Metadata_Node *head;
788 FLAC__Metadata_Node *tail;
790 FLAC__Metadata_ChainStatus status;
791 long first_offset, last_offset; /*@@@ 2G limit */
793 * This is the length of the chain initially read from the FLAC file.
794 * it is used to compare against the current length to decide whether
795 * or not the whole file has to be rewritten.
797 unsigned initial_length; /*@@@ 4G limit */
800 struct FLAC__Metadata_Iterator {
801 FLAC__Metadata_Chain *chain;
802 FLAC__Metadata_Node *current;
805 FLAC_API const char * const FLAC__Metadata_ChainStatusString[] = {
806 "FLAC__METADATA_CHAIN_STATUS_OK",
807 "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT",
808 "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE",
809 "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE",
810 "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE",
811 "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA",
812 "FLAC__METADATA_CHAIN_STATUS_READ_ERROR",
813 "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR",
814 "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR",
815 "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR",
816 "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR",
817 "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR",
818 "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR",
819 "FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS",
820 "FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH",
821 "FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL"
825 static FLAC__Metadata_Node *node_new_()
827 return (FLAC__Metadata_Node*)calloc(1, sizeof(FLAC__Metadata_Node));
830 static void node_delete_(FLAC__Metadata_Node *node)
832 FLAC__ASSERT(0 != node);
834 FLAC__metadata_object_delete(node->data);
838 static void chain_init_(FLAC__Metadata_Chain *chain)
840 FLAC__ASSERT(0 != chain);
843 chain->head = chain->tail = 0;
845 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
846 chain->initial_length = 0;
849 static void chain_clear_(FLAC__Metadata_Chain *chain)
851 FLAC__Metadata_Node *node, *next;
853 FLAC__ASSERT(0 != chain);
855 for(node = chain->head; node; ) {
861 if(0 != chain->filename)
862 free(chain->filename);
867 static void chain_append_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
869 FLAC__ASSERT(0 != chain);
870 FLAC__ASSERT(0 != node);
871 FLAC__ASSERT(0 != node->data);
873 node->next = node->prev = 0;
874 node->data->is_last = true;
876 chain->tail->data->is_last = false;
881 FLAC__ASSERT(0 != chain->tail);
882 chain->tail->next = node;
883 node->prev = chain->tail;
889 static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
891 FLAC__ASSERT(0 != chain);
892 FLAC__ASSERT(0 != node);
894 if(node == chain->head)
895 chain->head = node->next;
897 node->prev->next = node->next;
899 if(node == chain->tail)
900 chain->tail = node->prev;
902 node->next->prev = node->prev;
905 chain->tail->data->is_last = true;
910 static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
912 chain_remove_node_(chain, node);
916 static unsigned chain_calculate_length_(FLAC__Metadata_Chain *chain)
918 const FLAC__Metadata_Node *node;
920 for(node = chain->head; node; node = node->next)
921 length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
925 static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
927 FLAC__ASSERT(0 != node);
928 FLAC__ASSERT(0 != node->data);
929 FLAC__ASSERT(0 != iterator);
930 FLAC__ASSERT(0 != iterator->current);
931 FLAC__ASSERT(0 != iterator->chain);
932 FLAC__ASSERT(0 != iterator->chain->head);
933 FLAC__ASSERT(0 != iterator->chain->tail);
935 node->data->is_last = false;
937 node->prev = iterator->current->prev;
938 node->next = iterator->current;
941 iterator->chain->head = node;
943 node->prev->next = node;
945 iterator->current->prev = node;
947 iterator->chain->nodes++;
950 static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
952 FLAC__ASSERT(0 != node);
953 FLAC__ASSERT(0 != node->data);
954 FLAC__ASSERT(0 != iterator);
955 FLAC__ASSERT(0 != iterator->current);
956 FLAC__ASSERT(0 != iterator->chain);
957 FLAC__ASSERT(0 != iterator->chain->head);
958 FLAC__ASSERT(0 != iterator->chain->tail);
960 iterator->current->data->is_last = false;
962 node->prev = iterator->current;
963 node->next = iterator->current->next;
966 iterator->chain->tail = node;
968 node->next->prev = node;
970 node->prev->next = node;
972 iterator->chain->tail->data->is_last = true;
974 iterator->chain->nodes++;
977 /* return true iff node and node->next are both padding */
978 static FLAC__bool chain_merge_adjacent_padding_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
980 if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) {
981 const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length;
982 node->data->length += growth;
984 chain_delete_node_(chain, node->next);
991 /* Returns the new length of the chain, or 0 if there was an error. */
992 /* WATCHOUT: This can get called multiple times before a write, so
993 * it should still work when this happens.
995 /* WATCHOUT: Make sure to also update the logic in
996 * FLAC__metadata_chain_check_if_tempfile_needed() if the logic here changes.
998 static unsigned chain_prepare_for_write_(FLAC__Metadata_Chain *chain, FLAC__bool use_padding)
1000 unsigned current_length = chain_calculate_length_(chain);
1003 /* if the metadata shrank and the last block is padding, we just extend the last padding block */
1004 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1005 const unsigned delta = chain->initial_length - current_length;
1006 chain->tail->data->length += delta;
1007 current_length += delta;
1008 FLAC__ASSERT(current_length == chain->initial_length);
1010 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */
1011 else if(current_length + FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
1012 FLAC__StreamMetadata *padding;
1013 FLAC__Metadata_Node *node;
1014 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) {
1015 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1018 padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + current_length);
1019 if(0 == (node = node_new_())) {
1020 FLAC__metadata_object_delete(padding);
1021 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1024 node->data = padding;
1025 chain_append_node_(chain, node);
1026 current_length = chain_calculate_length_(chain);
1027 FLAC__ASSERT(current_length == chain->initial_length);
1029 /* 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 */
1030 else if(current_length > chain->initial_length) {
1031 const unsigned delta = current_length - chain->initial_length;
1032 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1033 /* if the delta is exactly the size of the last padding block, remove the padding block */
1034 if(chain->tail->data->length + FLAC__STREAM_METADATA_HEADER_LENGTH == delta) {
1035 chain_delete_node_(chain, chain->tail);
1036 current_length = chain_calculate_length_(chain);
1037 FLAC__ASSERT(current_length == chain->initial_length);
1039 /* if there is at least 'delta' bytes of padding, trim the padding down */
1040 else if(chain->tail->data->length >= delta) {
1041 chain->tail->data->length -= delta;
1042 current_length -= delta;
1043 FLAC__ASSERT(current_length == chain->initial_length);
1049 return current_length;
1052 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)
1054 FLAC__Metadata_Node *node;
1056 FLAC__ASSERT(0 != chain);
1058 /* we assume we're already at the beginning of the file */
1060 switch(seek_to_first_metadata_block_cb_(handle, read_cb, seek_cb)) {
1064 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1067 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1070 chain->status = FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
1078 FLAC__int64 pos = tell_cb(handle);
1080 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1083 chain->first_offset = (long)pos;
1088 FLAC__MetadataType type;
1094 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1098 if(!read_metadata_block_header_cb_(handle, read_cb, &is_last, &type, &length)) {
1099 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1103 node->data = FLAC__metadata_object_new(type);
1104 if(0 == node->data) {
1106 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1110 node->data->is_last = is_last;
1111 node->data->length = length;
1113 chain->status = get_equivalent_status_(read_metadata_block_data_cb_(handle, read_cb, seek_cb, node->data));
1114 if(chain->status != FLAC__METADATA_CHAIN_STATUS_OK) {
1118 chain_append_node_(chain, node);
1123 FLAC__int64 pos = tell_cb(handle);
1125 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1128 chain->last_offset = (long)pos;
1131 chain->initial_length = chain_calculate_length_(chain);
1136 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)
1138 FLAC__Metadata_Node *node;
1140 FLAC__ASSERT(0 != chain);
1141 FLAC__ASSERT(0 != chain->head);
1143 if(0 != seek_cb(handle, chain->first_offset, SEEK_SET)) {
1144 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1148 for(node = chain->head; node; node = node->next) {
1149 if(!write_metadata_block_header_cb_(handle, write_cb, node->data)) {
1150 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1153 if(!write_metadata_block_data_cb_(handle, write_cb, node->data)) {
1154 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1159 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1161 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
1165 static FLAC__bool chain_rewrite_metadata_in_place_(FLAC__Metadata_Chain *chain)
1170 FLAC__ASSERT(0 != chain->filename);
1172 if(0 == (file = fopen(chain->filename, "r+b"))) {
1173 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1177 /* chain_rewrite_metadata_in_place_cb_() sets chain->status for us */
1178 ret = chain_rewrite_metadata_in_place_cb_(chain, (FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, fseek_wrapper_);
1185 static FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix)
1189 FLAC__Metadata_SimpleIteratorStatus status;
1190 const FLAC__Metadata_Node *node;
1192 FLAC__ASSERT(0 != chain);
1193 FLAC__ASSERT(0 != chain->filename);
1194 FLAC__ASSERT(0 != chain->head);
1196 /* copy the file prefix (data up to first metadata block */
1197 if(0 == (f = fopen(chain->filename, "rb"))) {
1198 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1201 if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) {
1202 chain->status = get_equivalent_status_(status);
1203 cleanup_tempfile_(&tempfile, &tempfilename);
1206 if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) {
1207 chain->status = get_equivalent_status_(status);
1208 cleanup_tempfile_(&tempfile, &tempfilename);
1212 /* write the metadata */
1213 for(node = chain->head; node; node = node->next) {
1214 if(!write_metadata_block_header_(tempfile, &status, node->data)) {
1215 chain->status = get_equivalent_status_(status);
1218 if(!write_metadata_block_data_(tempfile, &status, node->data)) {
1219 chain->status = get_equivalent_status_(status);
1223 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1225 /* copy the file postfix (everything after the metadata) */
1226 if(0 != fseek(f, chain->last_offset, SEEK_SET)) {
1227 cleanup_tempfile_(&tempfile, &tempfilename);
1228 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1231 if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) {
1232 cleanup_tempfile_(&tempfile, &tempfilename);
1233 chain->status = get_equivalent_status_(status);
1237 /* move the tempfile on top of the original */
1239 if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status))
1245 /* assumes 'handle' is already at beginning of file */
1246 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)
1248 FLAC__Metadata_SimpleIteratorStatus status;
1249 const FLAC__Metadata_Node *node;
1251 FLAC__ASSERT(0 != chain);
1252 FLAC__ASSERT(0 == chain->filename);
1253 FLAC__ASSERT(0 != chain->head);
1255 /* copy the file prefix (data up to first metadata block */
1256 if(!copy_n_bytes_from_file_cb_(handle, read_cb, temp_handle, temp_write_cb, chain->first_offset, &status)) {
1257 chain->status = get_equivalent_status_(status);
1261 /* write the metadata */
1262 for(node = chain->head; node; node = node->next) {
1263 if(!write_metadata_block_header_cb_(temp_handle, temp_write_cb, node->data)) {
1264 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1267 if(!write_metadata_block_data_cb_(temp_handle, temp_write_cb, node->data)) {
1268 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1272 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1274 /* copy the file postfix (everything after the metadata) */
1275 if(0 != seek_cb(handle, chain->last_offset, SEEK_SET)) {
1276 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1279 if(!copy_remaining_bytes_from_file_cb_(handle, read_cb, eof_cb, temp_handle, temp_write_cb, &status)) {
1280 chain->status = get_equivalent_status_(status);
1287 FLAC_API FLAC__Metadata_Chain *FLAC__metadata_chain_new()
1289 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)calloc(1, sizeof(FLAC__Metadata_Chain));
1297 FLAC_API void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain)
1299 FLAC__ASSERT(0 != chain);
1301 chain_clear_(chain);
1306 FLAC_API FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain)
1308 FLAC__Metadata_ChainStatus status;
1310 FLAC__ASSERT(0 != chain);
1312 status = chain->status;
1313 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
1317 FLAC_API FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename)
1322 FLAC__ASSERT(0 != chain);
1323 FLAC__ASSERT(0 != filename);
1325 chain_clear_(chain);
1327 if(0 == (chain->filename = strdup(filename))) {
1328 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1332 if(0 == (file = fopen(filename, "rb"))) {
1333 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1337 /* chain_read_cb_() sets chain->status for us */
1338 ret = chain_read_cb_(chain, file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, ftell_wrapper_);
1345 FLAC_API FLAC__bool FLAC__metadata_chain_read_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1347 FLAC__ASSERT(0 != chain);
1349 chain_clear_(chain);
1351 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.tell) {
1352 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1357 if(0 != callbacks.seek(handle, 0, SEEK_SET)) {
1358 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1362 if(!chain_read_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.tell))
1363 return false; /* chain->status is already set by chain_read_cb_ */
1368 FLAC_API FLAC__bool FLAC__metadata_chain_check_if_tempfile_needed(FLAC__Metadata_Chain *chain, FLAC__bool use_padding)
1370 /* This does all the same checks that are in chain_prepare_for_write_()
1371 * but doesn't actually alter the chain. Make sure to update the logic
1372 * here if chain_prepare_for_write_() changes.
1374 const unsigned current_length = chain_calculate_length_(chain);
1376 FLAC__ASSERT(0 != chain);
1379 /* if the metadata shrank and the last block is padding, we just extend the last padding block */
1380 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING)
1382 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */
1383 else if(current_length + FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length)
1385 /* 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 */
1386 else if(current_length > chain->initial_length) {
1387 const unsigned delta = current_length - chain->initial_length;
1388 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1389 /* if the delta is exactly the size of the last padding block, remove the padding block */
1390 if(chain->tail->data->length + FLAC__STREAM_METADATA_HEADER_LENGTH == delta)
1392 /* if there is at least 'delta' bytes of padding, trim the padding down */
1393 else if(chain->tail->data->length >= delta)
1399 return (current_length != chain->initial_length);
1402 FLAC_API FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats)
1405 const char *tempfile_path_prefix = 0;
1406 unsigned current_length;
1408 FLAC__ASSERT(0 != chain);
1410 if (0 == chain->filename) {
1411 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1415 current_length = chain_prepare_for_write_(chain, use_padding);
1417 /* a return value of 0 means there was an error; chain->status is already set */
1418 if (0 == current_length)
1421 if(preserve_file_stats)
1422 get_file_stats_(chain->filename, &stats);
1424 if(current_length == chain->initial_length) {
1425 if(!chain_rewrite_metadata_in_place_(chain))
1429 if(!chain_rewrite_file_(chain, tempfile_path_prefix))
1432 /* recompute lengths and offsets */
1434 const FLAC__Metadata_Node *node;
1435 chain->initial_length = current_length;
1436 chain->last_offset = chain->first_offset;
1437 for(node = chain->head; node; node = node->next)
1438 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1442 if(preserve_file_stats)
1443 set_file_stats_(chain->filename, &stats);
1448 FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1450 unsigned current_length;
1452 FLAC__ASSERT(0 != chain);
1454 if (0 != chain->filename) {
1455 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1459 if (0 == callbacks.write || 0 == callbacks.seek) {
1460 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1464 if (FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) {
1465 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL;
1469 current_length = chain_prepare_for_write_(chain, use_padding);
1471 /* a return value of 0 means there was an error; chain->status is already set */
1472 if (0 == current_length)
1475 FLAC__ASSERT(current_length == chain->initial_length);
1477 return chain_rewrite_metadata_in_place_cb_(chain, handle, callbacks.write, callbacks.seek);
1480 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)
1482 unsigned current_length;
1484 FLAC__ASSERT(0 != chain);
1486 if (0 != chain->filename) {
1487 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1491 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.eof) {
1492 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1495 if (0 == temp_callbacks.write) {
1496 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1500 if (!FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) {
1501 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL;
1505 current_length = chain_prepare_for_write_(chain, use_padding);
1507 /* a return value of 0 means there was an error; chain->status is already set */
1508 if (0 == current_length)
1511 FLAC__ASSERT(current_length != chain->initial_length);
1514 if(0 != callbacks.seek(handle, 0, SEEK_SET)) {
1515 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1519 if(!chain_rewrite_file_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.eof, temp_handle, temp_callbacks.write))
1522 /* recompute lengths and offsets */
1524 const FLAC__Metadata_Node *node;
1525 chain->initial_length = current_length;
1526 chain->last_offset = chain->first_offset;
1527 for(node = chain->head; node; node = node->next)
1528 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1534 FLAC_API void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain)
1536 FLAC__Metadata_Node *node;
1538 FLAC__ASSERT(0 != chain);
1540 for(node = chain->head; node; ) {
1541 if(!chain_merge_adjacent_padding_(chain, node))
1546 FLAC_API void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain)
1548 FLAC__Metadata_Node *node, *save;
1551 FLAC__ASSERT(0 != chain);
1554 * Don't try and be too smart... this simple algo is good enough for
1555 * the small number of nodes that we deal with.
1557 for(i = 0, node = chain->head; i < chain->nodes; i++) {
1558 if(node->data->type == FLAC__METADATA_TYPE_PADDING) {
1560 chain_remove_node_(chain, node);
1561 chain_append_node_(chain, node);
1569 FLAC__metadata_chain_merge_padding(chain);
1573 FLAC_API FLAC__Metadata_Iterator *FLAC__metadata_iterator_new()
1575 FLAC__Metadata_Iterator *iterator = (FLAC__Metadata_Iterator*)calloc(1, sizeof(FLAC__Metadata_Iterator));
1577 /* calloc() implies:
1578 iterator->current = 0;
1579 iterator->chain = 0;
1585 FLAC_API void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator)
1587 FLAC__ASSERT(0 != iterator);
1592 FLAC_API void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain)
1594 FLAC__ASSERT(0 != iterator);
1595 FLAC__ASSERT(0 != chain);
1596 FLAC__ASSERT(0 != chain->head);
1598 iterator->chain = chain;
1599 iterator->current = chain->head;
1602 FLAC_API FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator)
1604 FLAC__ASSERT(0 != iterator);
1606 if(0 == iterator->current || 0 == iterator->current->next)
1609 iterator->current = iterator->current->next;
1613 FLAC_API FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator)
1615 FLAC__ASSERT(0 != iterator);
1617 if(0 == iterator->current || 0 == iterator->current->prev)
1620 iterator->current = iterator->current->prev;
1624 FLAC_API FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator)
1626 FLAC__ASSERT(0 != iterator);
1627 FLAC__ASSERT(0 != iterator->current);
1628 FLAC__ASSERT(0 != iterator->current->data);
1630 return iterator->current->data->type;
1633 FLAC_API FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator)
1635 FLAC__ASSERT(0 != iterator);
1636 FLAC__ASSERT(0 != iterator->current);
1638 return iterator->current->data;
1641 FLAC_API FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1643 FLAC__ASSERT(0 != iterator);
1644 FLAC__ASSERT(0 != block);
1645 return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block);
1648 FLAC_API FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding)
1650 FLAC__Metadata_Node *save;
1652 FLAC__ASSERT(0 != iterator);
1653 FLAC__ASSERT(0 != iterator->current);
1655 if(0 == iterator->current->prev) {
1656 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1660 save = iterator->current->prev;
1662 if(replace_with_padding) {
1663 FLAC__metadata_object_delete_data(iterator->current->data);
1664 iterator->current->data->type = FLAC__METADATA_TYPE_PADDING;
1667 chain_delete_node_(iterator->chain, iterator->current);
1670 iterator->current = save;
1674 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1676 FLAC__Metadata_Node *node;
1678 FLAC__ASSERT(0 != iterator);
1679 FLAC__ASSERT(0 != iterator->current);
1680 FLAC__ASSERT(0 != block);
1682 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1685 if(0 == iterator->current->prev) {
1686 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1690 if(0 == (node = node_new_()))
1694 iterator_insert_node_(iterator, node);
1695 iterator->current = node;
1699 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1701 FLAC__Metadata_Node *node;
1703 FLAC__ASSERT(0 != iterator);
1704 FLAC__ASSERT(0 != iterator->current);
1705 FLAC__ASSERT(0 != block);
1707 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1710 if(0 == (node = node_new_()))
1714 iterator_insert_node_after_(iterator, node);
1715 iterator->current = node;
1720 /****************************************************************************
1722 * Local function definitions
1724 ***************************************************************************/
1726 void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1732 for(i = 0; i < bytes; i++) {
1733 *(--b) = (FLAC__byte)(val & 0xff);
1738 void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1742 for(i = 0; i < bytes; i++) {
1743 *(b++) = (FLAC__byte)(val & 0xff);
1748 void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes)
1754 for(i = 0; i < bytes; i++) {
1755 *(--b) = (FLAC__byte)(val & 0xff);
1760 FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes)
1762 FLAC__uint32 ret = 0;
1765 for(i = 0; i < bytes; i++)
1766 ret = (ret << 8) | (FLAC__uint32)(*b++);
1771 FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes)
1773 FLAC__uint32 ret = 0;
1778 for(i = 0; i < bytes; i++)
1779 ret = (ret << 8) | (FLAC__uint32)(*--b);
1784 FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes)
1786 FLAC__uint64 ret = 0;
1789 for(i = 0; i < bytes; i++)
1790 ret = (ret << 8) | (FLAC__uint64)(*b++);
1795 FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator)
1797 FLAC__ASSERT(0 != iterator);
1798 FLAC__ASSERT(0 != iterator->file);
1800 if(!read_metadata_block_header_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, &iterator->is_last, &iterator->type, &iterator->length)) {
1801 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1808 FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block)
1810 FLAC__ASSERT(0 != iterator);
1811 FLAC__ASSERT(0 != iterator->file);
1813 iterator->status = read_metadata_block_data_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, block);
1815 return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1818 FLAC__bool read_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__bool *is_last, FLAC__MetadataType *type, unsigned *length)
1820 FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH];
1822 if(read_cb(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH)
1825 *is_last = raw_header[0] & 0x80? true : false;
1826 *type = (FLAC__MetadataType)(raw_header[0] & 0x7f);
1827 *length = unpack_uint32_(raw_header + 1, 3);
1829 /* Note that we don't check:
1830 * if(iterator->type >= FLAC__METADATA_TYPE_UNDEFINED)
1831 * we just will read in an opaque block
1837 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata *block)
1839 switch(block->type) {
1840 case FLAC__METADATA_TYPE_STREAMINFO:
1841 return read_metadata_block_data_streaminfo_cb_(handle, read_cb, &block->data.stream_info);
1842 case FLAC__METADATA_TYPE_PADDING:
1843 return read_metadata_block_data_padding_cb_(handle, seek_cb, &block->data.padding, block->length);
1844 case FLAC__METADATA_TYPE_APPLICATION:
1845 return read_metadata_block_data_application_cb_(handle, read_cb, &block->data.application, block->length);
1846 case FLAC__METADATA_TYPE_SEEKTABLE:
1847 return read_metadata_block_data_seektable_cb_(handle, read_cb, &block->data.seek_table, block->length);
1848 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1849 return read_metadata_block_data_vorbis_comment_cb_(handle, read_cb, &block->data.vorbis_comment);
1850 case FLAC__METADATA_TYPE_CUESHEET:
1851 return read_metadata_block_data_cuesheet_cb_(handle, read_cb, &block->data.cue_sheet);
1853 return read_metadata_block_data_unknown_cb_(handle, read_cb, &block->data.unknown, block->length);
1857 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block)
1859 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b;
1861 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1862 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1866 /* we are using hardcoded numbers for simplicity but we should
1867 * probably eventually write a bit-level unpacker and use the
1868 * _STREAMINFO_ constants.
1870 block->min_blocksize = unpack_uint32_(b, 2); b += 2;
1871 block->max_blocksize = unpack_uint32_(b, 2); b += 2;
1872 block->min_framesize = unpack_uint32_(b, 3); b += 3;
1873 block->max_framesize = unpack_uint32_(b, 3); b += 3;
1874 block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4);
1875 block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
1876 block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 4) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1;
1877 block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4);
1878 memcpy(block->md5sum, b+8, 16);
1880 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1884 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_Padding *block, unsigned block_length)
1886 (void)block; /* nothing to do; we don't care about reading the padding bytes */
1888 if(0 != seek_cb(handle, block_length, SEEK_CUR))
1889 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1891 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1894 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, unsigned block_length)
1896 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1898 if(read_cb(block->id, 1, id_bytes, handle) != id_bytes)
1899 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1901 block_length -= id_bytes;
1903 if(block_length == 0) {
1907 if(0 == (block->data = (FLAC__byte*)malloc(block_length)))
1908 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1910 if(read_cb(block->data, 1, block_length, handle) != block_length)
1911 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1914 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1917 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, unsigned block_length)
1920 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1922 FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0);
1924 block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1926 if(block->num_points == 0)
1928 else if(0 == (block->points = (FLAC__StreamMetadata_SeekPoint*)malloc(block->num_points * sizeof(FLAC__StreamMetadata_SeekPoint))))
1929 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1931 for(i = 0; i < block->num_points; i++) {
1932 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1933 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1934 /* some MAGIC NUMBERs here */
1935 block->points[i].sample_number = unpack_uint64_(buffer, 8);
1936 block->points[i].stream_offset = unpack_uint64_(buffer+8, 8);
1937 block->points[i].frame_samples = unpack_uint32_(buffer+16, 2);
1940 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1943 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment_Entry *entry)
1945 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1946 FLAC__byte buffer[4]; /* magic number is asserted below */
1948 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8 == 4);
1950 if(read_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
1951 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1952 entry->length = unpack_uint32_little_endian_(buffer, entry_length_len);
1954 if(0 != entry->entry)
1957 if(entry->length == 0) {
1961 if(0 == (entry->entry = (FLAC__byte*)malloc(entry->length+1)))
1962 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1964 if(read_cb(entry->entry, 1, entry->length, handle) != entry->length)
1965 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1967 entry->entry[entry->length] = '\0';
1970 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1973 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment *block)
1976 FLAC__Metadata_SimpleIteratorStatus status;
1977 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
1978 FLAC__byte buffer[4]; /* magic number is asserted below */
1980 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8 == 4);
1982 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, &(block->vendor_string))))
1985 if(read_cb(buffer, 1, num_comments_len, handle) != num_comments_len)
1986 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1987 block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len);
1989 if(block->num_comments == 0) {
1990 block->comments = 0;
1992 else if(0 == (block->comments = (FLAC__StreamMetadata_VorbisComment_Entry*)calloc(block->num_comments, sizeof(FLAC__StreamMetadata_VorbisComment_Entry))))
1993 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1995 for(i = 0; i < block->num_comments; i++) {
1996 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, block->comments + i)))
2000 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2003 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track)
2006 FLAC__byte buffer[32]; /* asserted below that this is big enough */
2008 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
2009 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
2010 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);
2012 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
2013 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
2014 if(read_cb(buffer, 1, len, handle) != len)
2015 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2016 track->offset = unpack_uint64_(buffer, len);
2018 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
2019 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
2020 if(read_cb(buffer, 1, len, handle) != len)
2021 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2022 track->number = (FLAC__byte)unpack_uint32_(buffer, len);
2024 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
2025 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
2026 if(read_cb(track->isrc, 1, len, handle) != len)
2027 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2029 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);
2030 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
2031 if(read_cb(buffer, 1, len, handle) != len)
2032 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2033 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN == 1);
2034 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN == 1);
2035 track->type = buffer[0] >> 7;
2036 track->pre_emphasis = (buffer[0] >> 6) & 1;
2038 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
2039 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
2040 if(read_cb(buffer, 1, len, handle) != len)
2041 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2042 track->num_indices = (FLAC__byte)unpack_uint32_(buffer, len);
2044 if(track->num_indices == 0) {
2047 else if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)calloc(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index))))
2048 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2050 for(i = 0; i < track->num_indices; i++) {
2051 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
2052 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
2053 if(read_cb(buffer, 1, len, handle) != len)
2054 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2055 track->indices[i].offset = unpack_uint64_(buffer, len);
2057 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
2058 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
2059 if(read_cb(buffer, 1, len, handle) != len)
2060 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2061 track->indices[i].number = (FLAC__byte)unpack_uint32_(buffer, len);
2063 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
2064 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
2065 if(read_cb(buffer, 1, len, handle) != len)
2066 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2069 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2072 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block)
2075 FLAC__Metadata_SimpleIteratorStatus status;
2076 FLAC__byte buffer[1024]; /* MSVC needs a constant expression so we put a magic number and assert */
2078 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN)/8 <= sizeof(buffer));
2079 FLAC__ASSERT(sizeof(FLAC__uint64) <= sizeof(buffer));
2081 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
2082 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
2083 if(read_cb(block->media_catalog_number, 1, len, handle) != len)
2084 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2086 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
2087 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
2088 if(read_cb(buffer, 1, len, handle) != len)
2089 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2090 block->lead_in = unpack_uint64_(buffer, len);
2092 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
2093 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
2094 if(read_cb(buffer, 1, len, handle) != len)
2095 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2096 block->is_cd = buffer[0]&0x80? true : false;
2098 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
2099 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
2100 if(read_cb(buffer, 1, len, handle) != len)
2101 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2102 block->num_tracks = unpack_uint32_(buffer, len);
2104 if(block->num_tracks == 0) {
2107 else if(0 == (block->tracks = (FLAC__StreamMetadata_CueSheet_Track*)calloc(block->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track))))
2108 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2110 for(i = 0; i < block->num_tracks; i++) {
2111 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_cuesheet_track_cb_(handle, read_cb, block->tracks + i)))
2115 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2118 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, unsigned block_length)
2120 if(block_length == 0) {
2124 if(0 == (block->data = (FLAC__byte*)malloc(block_length)))
2125 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2127 if(read_cb(block->data, 1, block_length, handle) != block_length)
2128 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2131 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2134 FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
2136 FLAC__ASSERT(0 != file);
2137 FLAC__ASSERT(0 != status);
2139 if(!write_metadata_block_header_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) {
2140 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2147 FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
2149 FLAC__ASSERT(0 != file);
2150 FLAC__ASSERT(0 != status);
2152 if (write_metadata_block_data_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) {
2153 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2157 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2162 FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block)
2164 FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH];
2166 FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
2168 buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type;
2169 pack_uint32_(block->length, buffer + 1, 3);
2171 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH)
2177 FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block)
2179 FLAC__ASSERT(0 != block);
2181 switch(block->type) {
2182 case FLAC__METADATA_TYPE_STREAMINFO:
2183 return write_metadata_block_data_streaminfo_cb_(handle, write_cb, &block->data.stream_info);
2184 case FLAC__METADATA_TYPE_PADDING:
2185 return write_metadata_block_data_padding_cb_(handle, write_cb, &block->data.padding, block->length);
2186 case FLAC__METADATA_TYPE_APPLICATION:
2187 return write_metadata_block_data_application_cb_(handle, write_cb, &block->data.application, block->length);
2188 case FLAC__METADATA_TYPE_SEEKTABLE:
2189 return write_metadata_block_data_seektable_cb_(handle, write_cb, &block->data.seek_table);
2190 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
2191 return write_metadata_block_data_vorbis_comment_cb_(handle, write_cb, &block->data.vorbis_comment);
2192 case FLAC__METADATA_TYPE_CUESHEET:
2193 return write_metadata_block_data_cuesheet_cb_(handle, write_cb, &block->data.cue_sheet);
2195 return write_metadata_block_data_unknown_cb_(handle, write_cb, &block->data.unknown, block->length);
2199 FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block)
2201 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH];
2202 const unsigned channels1 = block->channels - 1;
2203 const unsigned bps1 = block->bits_per_sample - 1;
2205 /* we are using hardcoded numbers for simplicity but we should
2206 * probably eventually write a bit-level packer and use the
2207 * _STREAMINFO_ constants.
2209 pack_uint32_(block->min_blocksize, buffer, 2);
2210 pack_uint32_(block->max_blocksize, buffer+2, 2);
2211 pack_uint32_(block->min_framesize, buffer+4, 3);
2212 pack_uint32_(block->max_framesize, buffer+7, 3);
2213 buffer[10] = (block->sample_rate >> 12) & 0xff;
2214 buffer[11] = (block->sample_rate >> 4) & 0xff;
2215 buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4);
2216 buffer[13] = (FLAC__byte)(((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f));
2217 pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4);
2218 memcpy(buffer+18, block->md5sum, 16);
2220 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
2226 FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, unsigned block_length)
2228 unsigned i, n = block_length;
2229 FLAC__byte buffer[1024];
2233 memset(buffer, 0, 1024);
2235 for(i = 0; i < n/1024; i++)
2236 if(write_cb(buffer, 1, 1024, handle) != 1024)
2241 if(write_cb(buffer, 1, n, handle) != n)
2247 FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, unsigned block_length)
2249 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
2251 if(write_cb(block->id, 1, id_bytes, handle) != id_bytes)
2254 block_length -= id_bytes;
2256 if(write_cb(block->data, 1, block_length, handle) != block_length)
2262 FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block)
2265 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
2267 for(i = 0; i < block->num_points; i++) {
2268 /* some MAGIC NUMBERs here */
2269 pack_uint64_(block->points[i].sample_number, buffer, 8);
2270 pack_uint64_(block->points[i].stream_offset, buffer+8, 8);
2271 pack_uint32_(block->points[i].frame_samples, buffer+16, 2);
2272 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
2279 FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block)
2282 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
2283 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
2284 FLAC__byte buffer[4]; /* magic number is asserted below */
2286 FLAC__ASSERT(max(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8 == 4);
2288 pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len);
2289 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2291 if(write_cb(block->vendor_string.entry, 1, block->vendor_string.length, handle) != block->vendor_string.length)
2294 pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len);
2295 if(write_cb(buffer, 1, num_comments_len, handle) != num_comments_len)
2298 for(i = 0; i < block->num_comments; i++) {
2299 pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len);
2300 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2302 if(write_cb(block->comments[i].entry, 1, block->comments[i].length, handle) != block->comments[i].length)
2309 FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block)
2312 FLAC__byte buffer[1024]; /* asserted below that this is big enough */
2314 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
2315 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN/8);
2316 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);
2317 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
2319 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
2320 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
2321 if(write_cb(block->media_catalog_number, 1, len, handle) != len)
2324 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
2325 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
2326 pack_uint64_(block->lead_in, buffer, len);
2327 if(write_cb(buffer, 1, len, handle) != len)
2330 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
2331 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
2332 memset(buffer, 0, len);
2335 if(write_cb(buffer, 1, len, handle) != len)
2338 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
2339 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
2340 pack_uint32_(block->num_tracks, buffer, len);
2341 if(write_cb(buffer, 1, len, handle) != len)
2344 for(i = 0; i < block->num_tracks; i++) {
2345 FLAC__StreamMetadata_CueSheet_Track *track = block->tracks + i;
2347 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
2348 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
2349 pack_uint64_(track->offset, buffer, len);
2350 if(write_cb(buffer, 1, len, handle) != len)
2353 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
2354 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
2355 pack_uint32_(track->number, buffer, len);
2356 if(write_cb(buffer, 1, len, handle) != len)
2359 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
2360 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
2361 if(write_cb(track->isrc, 1, len, handle) != len)
2364 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);
2365 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
2366 memset(buffer, 0, len);
2367 buffer[0] = (track->type << 7) | (track->pre_emphasis << 6);
2368 if(write_cb(buffer, 1, len, handle) != len)
2371 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
2372 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
2373 pack_uint32_(track->num_indices, buffer, len);
2374 if(write_cb(buffer, 1, len, handle) != len)
2377 for(j = 0; j < track->num_indices; j++) {
2378 FLAC__StreamMetadata_CueSheet_Index *index = track->indices + j;
2380 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
2381 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
2382 pack_uint64_(index->offset, buffer, len);
2383 if(write_cb(buffer, 1, len, handle) != len)
2386 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
2387 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
2388 pack_uint32_(index->number, buffer, len);
2389 if(write_cb(buffer, 1, len, handle) != len)
2392 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
2393 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
2394 memset(buffer, 0, len);
2395 if(write_cb(buffer, 1, len, handle) != len)
2403 FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, unsigned block_length)
2405 if(write_cb(block->data, 1, block_length, handle) != block_length)
2411 FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block)
2413 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2414 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2418 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
2421 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
2424 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2425 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2429 return read_metadata_block_header_(iterator);
2432 FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last)
2434 FLAC__StreamMetadata *padding;
2436 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2437 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2441 block->is_last = false;
2443 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
2446 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
2449 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)))
2450 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2452 padding->is_last = padding_is_last;
2453 padding->length = padding_length;
2455 if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) {
2456 FLAC__metadata_object_delete(padding);
2460 if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) {
2461 FLAC__metadata_object_delete(padding);
2465 FLAC__metadata_object_delete(padding);
2467 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2468 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2472 return read_metadata_block_header_(iterator);
2475 FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append)
2479 int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */
2480 long fixup_is_last_flag_offset = -1;
2482 FLAC__ASSERT(0 != block || append == false);
2484 if(iterator->is_last) {
2486 fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */
2487 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2489 else if(0 == block) {
2490 simple_iterator_push_(iterator);
2491 if(!FLAC__metadata_simple_iterator_prev(iterator)) {
2492 (void)simple_iterator_pop_(iterator);
2495 fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */
2496 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2497 if(!simple_iterator_pop_(iterator))
2502 if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append))
2506 if(!write_metadata_block_header_(tempfile, &iterator->status, block)) {
2507 cleanup_tempfile_(&tempfile, &tempfilename);
2511 if(!write_metadata_block_data_(tempfile, &iterator->status, block)) {
2512 cleanup_tempfile_(&tempfile, &tempfilename);
2517 if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0))
2521 return FLAC__metadata_simple_iterator_next(iterator);
2526 void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator)
2528 FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH);
2529 iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth];
2533 FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator)
2535 FLAC__ASSERT(iterator->depth > 0);
2537 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2538 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2542 return read_metadata_block_header_(iterator);
2549 * 3: not a FLAC file
2551 unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb)
2553 FLAC__byte buffer[4];
2557 FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == 4);
2559 /* skip any id3v2 tag */
2561 n = read_cb(buffer, 1, 4, handle);
2566 else if(0 == memcmp(buffer, "ID3", 3)) {
2567 unsigned tag_length = 0;
2569 /* skip to the tag length */
2570 if(seek_cb(handle, 2, SEEK_CUR) < 0)
2573 /* read the length */
2574 for(i = 0; i < 4; i++) {
2575 if(read_cb(buffer, 1, 1, handle) < 1 || buffer[0] & 0x80)
2578 tag_length |= (buffer[0] & 0x7f);
2581 /* skip the rest of the tag */
2582 if(seek_cb(handle, tag_length, SEEK_CUR) < 0)
2585 /* read the stream sync code */
2587 n = read_cb(buffer, 1, 4, handle);
2594 /* check for the fLaC signature */
2595 if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH))
2601 unsigned seek_to_first_metadata_block_(FILE *f)
2603 return seek_to_first_metadata_block_cb_((FLAC__IOHandle)f, (FLAC__IOCallback_Read)fread, fseek_wrapper_);
2606 FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append)
2608 const long offset_end = append? iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length : iterator->offset[iterator->depth];
2610 if(0 != fseek(iterator->file, 0, SEEK_SET)) {
2611 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2614 if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) {
2615 cleanup_tempfile_(tempfile, tempfilename);
2618 if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) {
2619 cleanup_tempfile_(tempfile, tempfilename);
2626 FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, long fixup_is_last_flag_offset, FLAC__bool backup)
2628 long save_offset = iterator->offset[iterator->depth]; /*@@@ 2G limit */
2629 FLAC__ASSERT(0 != *tempfile);
2631 if(0 != fseek(iterator->file, save_offset + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length, SEEK_SET)) {
2632 cleanup_tempfile_(tempfile, tempfilename);
2633 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2636 if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) {
2637 cleanup_tempfile_(tempfile, tempfilename);
2641 if(fixup_is_last_code != 0) {
2643 * if code == 1, it means a block was appended to the end so
2644 * we have to clear the is_last flag of the previous block
2645 * if code == -1, it means the last block was deleted so
2646 * we have to set the is_last flag of the previous block
2648 /* MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */
2650 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2651 cleanup_tempfile_(tempfile, tempfilename);
2652 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2655 if(fread(&x, 1, 1, *tempfile) != 1) {
2656 cleanup_tempfile_(tempfile, tempfilename);
2657 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2660 if(fixup_is_last_code > 0) {
2661 FLAC__ASSERT(x & 0x80);
2665 FLAC__ASSERT(!(x & 0x80));
2668 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2669 cleanup_tempfile_(tempfile, tempfilename);
2670 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2673 if(local__fwrite(&x, 1, 1, *tempfile) != 1) {
2674 cleanup_tempfile_(tempfile, tempfilename);
2675 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2680 (void)fclose(iterator->file);
2682 if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status))
2685 if(iterator->has_stats)
2686 set_file_stats_(iterator->filename, &iterator->stats);
2688 if(!simple_iterator_prime_input_(iterator, !iterator->is_writable))
2691 while(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length < save_offset)
2692 if(!FLAC__metadata_simple_iterator_next(iterator))
2697 /* move the iterator to it's original block faster by faking a push, then doing a pop_ */
2698 FLAC__ASSERT(iterator->depth == 0);
2699 iterator->offset[0] = save_offset;
2701 return simple_iterator_pop_(iterator);
2705 FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, unsigned bytes/*@@@ 4G limit*/, FLAC__Metadata_SimpleIteratorStatus *status)
2707 FLAC__byte buffer[8192];
2711 n = min(sizeof(buffer), bytes);
2712 if(fread(buffer, 1, n, file) != n) {
2713 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2716 if(local__fwrite(buffer, 1, n, tempfile) != n) {
2717 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2726 FLAC__bool copy_n_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, unsigned bytes/*@@@ 4G limit*/, FLAC__Metadata_SimpleIteratorStatus *status)
2728 FLAC__byte buffer[8192];
2732 n = min(sizeof(buffer), bytes);
2733 if(read_cb(buffer, 1, n, handle) != n) {
2734 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2737 if(temp_write_cb(buffer, 1, n, temp_handle) != n) {
2738 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2747 FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status)
2749 FLAC__byte buffer[8192];
2752 while(!feof(file)) {
2753 n = fread(buffer, 1, sizeof(buffer), file);
2754 if(n == 0 && !feof(file)) {
2755 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2758 if(n > 0 && local__fwrite(buffer, 1, n, tempfile) != n) {
2759 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2767 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)
2769 FLAC__byte buffer[8192];
2772 while(!eof_cb(handle)) {
2773 n = read_cb(buffer, 1, sizeof(buffer), handle);
2774 if(n == 0 && !eof_cb(handle)) {
2775 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2778 if(n > 0 && temp_write_cb(buffer, 1, n, temp_handle) != n) {
2779 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2787 FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
2789 static const char *tempfile_suffix = ".metadata_edit";
2790 if(0 == tempfile_path_prefix) {
2791 if(0 == (*tempfilename = (char*)malloc(strlen(filename) + strlen(tempfile_suffix) + 1))) {
2792 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2795 strcpy(*tempfilename, filename);
2796 strcat(*tempfilename, tempfile_suffix);
2799 const char *p = strrchr(filename, '/');
2805 if(0 == (*tempfilename = (char*)malloc(strlen(tempfile_path_prefix) + 1 + strlen(p) + strlen(tempfile_suffix) + 1))) {
2806 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2809 strcpy(*tempfilename, tempfile_path_prefix);
2810 strcat(*tempfilename, "/");
2811 strcat(*tempfilename, p);
2812 strcat(*tempfilename, tempfile_suffix);
2815 if(0 == (*tempfile = fopen(*tempfilename, "w+b"))) {
2816 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
2823 FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
2825 FLAC__ASSERT(0 != filename);
2826 FLAC__ASSERT(0 != tempfile);
2827 FLAC__ASSERT(0 != *tempfile);
2828 FLAC__ASSERT(0 != tempfilename);
2829 FLAC__ASSERT(0 != *tempfilename);
2830 FLAC__ASSERT(0 != status);
2832 (void)fclose(*tempfile);
2835 #if defined _MSC_VER || defined __MINGW32__ || defined __EMX__
2836 if(unlink(filename) < 0) {
2837 cleanup_tempfile_(tempfile, tempfilename);
2838 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR;
2843 /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just rename(): */
2844 if(0 != rename(*tempfilename, filename)) {
2845 cleanup_tempfile_(tempfile, tempfilename);
2846 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR;
2850 cleanup_tempfile_(tempfile, tempfilename);
2855 void cleanup_tempfile_(FILE **tempfile, char **tempfilename)
2857 if(0 != *tempfile) {
2858 (void)fclose(*tempfile);
2862 if(0 != *tempfilename) {
2863 (void)unlink(*tempfilename);
2864 free(*tempfilename);
2869 FLAC__bool get_file_stats_(const char *filename, struct stat *stats)
2871 FLAC__ASSERT(0 != filename);
2872 FLAC__ASSERT(0 != stats);
2873 return (0 == stat(filename, stats));
2876 void set_file_stats_(const char *filename, struct stat *stats)
2878 struct utimbuf srctime;
2880 FLAC__ASSERT(0 != filename);
2881 FLAC__ASSERT(0 != stats);
2883 srctime.actime = stats->st_atime;
2884 srctime.modtime = stats->st_mtime;
2885 (void)chmod(filename, stats->st_mode);
2886 (void)utime(filename, &srctime);
2887 #if !defined _MSC_VER && !defined __MINGW32__ && !defined __EMX__
2888 (void)chown(filename, stats->st_uid, -1);
2889 (void)chown(filename, -1, stats->st_gid);
2894 * We cast FLAC__int64 to long and use fseek()/ftell() because
2895 * none of our operations on metadata is ever likely to go past
2898 int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence)
2900 FLAC__ASSERT(offset <= 0x7fffffff);
2901 return fseek((FILE*)handle, (long)offset, whence);
2904 FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle)
2906 return (long)ftell((FILE*)handle);
2909 FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status)
2912 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK:
2913 return FLAC__METADATA_CHAIN_STATUS_OK;
2914 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT:
2915 return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT;
2916 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE:
2917 return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
2918 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE:
2919 return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
2920 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE:
2921 return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE;
2922 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA:
2923 return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA;
2924 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR:
2925 return FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
2926 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR:
2927 return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
2928 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR:
2929 return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
2930 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR:
2931 return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR;
2932 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR:
2933 return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR;
2934 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR:
2935 return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
2936 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR:
2938 return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;