1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2001,2002 Josh Coalson
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
25 #if defined _MSC_VER || defined __MINGW32__
26 #include <sys/utime.h> /* for utime() */
27 #include <io.h> /* for chmod() */
29 #include <sys/types.h> /* some flavors of BSD (like OS X) require this to get time_t */
30 #include <utime.h> /* for utime() */
31 #include <unistd.h> /* for chown(), unlink() */
33 #include <sys/stat.h> /* for stat(), maybe chmod() */
35 #include "private/metadata.h"
37 #include "FLAC/assert.h"
38 #include "FLAC/file_decoder.h"
43 #define max(a,b) ((a)>(b)?(a):(b))
47 #define min(a,b) ((a)<(b)?(a):(b))
50 /****************************************************************************
52 * Local function declarations
54 ***************************************************************************/
56 static void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
57 static void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
58 static void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes);
59 static FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes);
60 static FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes);
61 static FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes);
63 static FLAC__bool read_metadata_block_header_(FLAC__MetaData_SimpleIterator *iterator);
64 static FLAC__bool read_metadata_block_data_(FLAC__MetaData_SimpleIterator *iterator, FLAC__StreamMetaData *block);
65 static FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_streaminfo_(FILE *file, FLAC__StreamMetaData_StreamInfo *block);
66 static FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_padding_(FILE *file, FLAC__StreamMetaData_Padding *block, unsigned block_length);
67 static FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_application_(FILE *file, FLAC__StreamMetaData_Application *block, unsigned block_length);
68 static FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_seektable_(FILE *file, FLAC__StreamMetaData_SeekTable *block, unsigned block_length);
69 static FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_(FILE *file, FLAC__StreamMetaData_VorbisComment_Entry *entry);
70 static FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_(FILE *file, FLAC__StreamMetaData_VorbisComment *block);
72 static FLAC__bool write_metadata_block_header_(FILE *file, FLAC__MetaData_SimpleIteratorStatus *status, const FLAC__StreamMetaData *block);
73 static FLAC__bool write_metadata_block_data_(FILE *file, FLAC__MetaData_SimpleIteratorStatus *status, const FLAC__StreamMetaData *block);
74 static FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_streaminfo_(FILE *file, const FLAC__StreamMetaData_StreamInfo *block);
75 static FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_padding_(FILE *file, const FLAC__StreamMetaData_Padding *block, unsigned block_length);
76 static FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_application_(FILE *file, const FLAC__StreamMetaData_Application *block, unsigned block_length);
77 static FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_seektable_(FILE *file, const FLAC__StreamMetaData_SeekTable *block);
78 static FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_vorbis_comment_(FILE *file, const FLAC__StreamMetaData_VorbisComment *block);
79 static FLAC__bool write_metadata_block_stationary_(FLAC__MetaData_SimpleIterator *iterator, const FLAC__StreamMetaData *block);
80 static FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__MetaData_SimpleIterator *iterator, FLAC__StreamMetaData *block, unsigned padding_length, FLAC__bool padding_is_last);
81 static FLAC__bool rewrite_whole_file_(FLAC__MetaData_SimpleIterator *iterator, FLAC__StreamMetaData *block, FLAC__bool append);
83 static FLAC__bool chain_rewrite_chain_(FLAC__MetaData_Chain *chain);
84 static FLAC__bool chain_rewrite_file_(FLAC__MetaData_Chain *chain, const char *tempfile_path_prefix);
86 static void simple_iterator_push_(FLAC__MetaData_SimpleIterator *iterator);
87 static FLAC__bool simple_iterator_pop_(FLAC__MetaData_SimpleIterator *iterator);
89 /* return 0 if OK, 1 if read error, 2 if not a FLAC file */
90 static unsigned seek_to_first_metadata_block_(FILE *f);
92 static FLAC__bool simple_iterator_copy_file_prefix_(FLAC__MetaData_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append);
93 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);
95 static FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, unsigned bytes/*@@@ 4G limit*/, FLAC__MetaData_SimpleIteratorStatus *status);
96 static FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__MetaData_SimpleIteratorStatus *status);
98 static FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__MetaData_SimpleIteratorStatus *status);
99 static FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__MetaData_SimpleIteratorStatus *status);
100 static void cleanup_tempfile_(FILE **tempfile, char **tempfilename);
102 static FLAC__bool get_file_stats_(const char *filename, struct stat *stats);
103 static void set_file_stats_(const char *filename, struct stat *stats);
105 static FLAC__MetaData_ChainStatus get_equivalent_status_(FLAC__MetaData_SimpleIteratorStatus status);
108 /****************************************************************************
110 * Level 0 implementation
112 ***************************************************************************/
114 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
115 static void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data);
116 static void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
119 FLAC__bool got_error;
120 FLAC__bool got_streaminfo;
121 FLAC__StreamMetaData_StreamInfo *streaminfo;
122 } level0_client_data;
124 FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetaData_StreamInfo *streaminfo)
126 level0_client_data cd;
127 FLAC__FileDecoder *decoder = FLAC__file_decoder_new();
132 cd.got_error = false;
133 cd.got_streaminfo = false;
134 cd.streaminfo = streaminfo;
136 FLAC__file_decoder_set_md5_checking(decoder, false);
137 FLAC__file_decoder_set_filename(decoder, filename);
138 FLAC__file_decoder_set_write_callback(decoder, write_callback_);
139 FLAC__file_decoder_set_metadata_callback(decoder, metadata_callback_);
140 FLAC__file_decoder_set_error_callback(decoder, error_callback_);
141 FLAC__file_decoder_set_client_data(decoder, &cd);
143 if(FLAC__file_decoder_init(decoder) != FLAC__FILE_DECODER_OK || cd.got_error) {
144 FLAC__file_decoder_finish(decoder);
145 FLAC__file_decoder_delete(decoder);
149 if(!FLAC__file_decoder_process_metadata(decoder) || cd.got_error) {
150 FLAC__file_decoder_finish(decoder);
151 FLAC__file_decoder_delete(decoder);
155 FLAC__file_decoder_finish(decoder);
156 FLAC__file_decoder_delete(decoder);
158 return !cd.got_error && cd.got_streaminfo;
161 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
163 (void)decoder, (void)frame, (void)buffer, (void)client_data;
165 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
168 void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data)
170 level0_client_data *cd = (level0_client_data *)client_data;
173 if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO && 0 != cd->streaminfo) {
174 *(cd->streaminfo) = metadata->data.stream_info;
175 cd->got_streaminfo = true;
179 void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
181 level0_client_data *cd = (level0_client_data *)client_data;
184 if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
185 cd->got_error = true;
189 /****************************************************************************
191 * Level 1 implementation
193 ***************************************************************************/
195 #define SIMPLE_ITERATOR_MAX_PUSH_DEPTH (1+4)
196 /* 1 for initial offset, +4 for our own personal use */
198 struct FLAC__MetaData_SimpleIterator {
200 char *filename, *tempfile_path_prefix;
202 FLAC__bool has_stats;
203 FLAC__bool is_writable;
204 FLAC__MetaData_SimpleIteratorStatus status;
205 /*@@@ 2G limits here because of the offset type: */
206 long offset[SIMPLE_ITERATOR_MAX_PUSH_DEPTH];
207 long first_offset; /* this is the offset to the STREAMINFO block */
209 /* this is the metadata block header of the current block we are pointing to: */
211 FLAC__MetaDataType type;
215 const char * const FLAC__MetaData_SimpleIteratorStatusString[] = {
216 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK",
217 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT",
218 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE",
219 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE",
220 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE",
221 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA",
222 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR",
223 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR",
224 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR",
225 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR",
226 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR",
227 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR",
228 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR"
232 FLAC__MetaData_SimpleIterator *FLAC__metadata_simple_iterator_new()
234 FLAC__MetaData_SimpleIterator *iterator = malloc(sizeof(FLAC__MetaData_SimpleIterator));
238 iterator->filename = 0;
239 iterator->tempfile_path_prefix = 0;
240 iterator->has_stats = false;
241 iterator->is_writable = false;
242 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
243 iterator->first_offset = iterator->offset[0] = -1;
250 static void simple_iterator_free_guts_(FLAC__MetaData_SimpleIterator *iterator)
252 FLAC__ASSERT(0 != iterator);
254 if(0 != iterator->file) {
255 fclose(iterator->file);
257 if(iterator->has_stats)
258 set_file_stats_(iterator->filename, &iterator->stats);
260 if(0 != iterator->filename) {
261 free(iterator->filename);
262 iterator->filename = 0;
264 if(0 != iterator->tempfile_path_prefix) {
265 free(iterator->tempfile_path_prefix);
266 iterator->tempfile_path_prefix = 0;
270 void FLAC__metadata_simple_iterator_delete(FLAC__MetaData_SimpleIterator *iterator)
272 FLAC__ASSERT(0 != iterator);
274 simple_iterator_free_guts_(iterator);
278 FLAC__MetaData_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__MetaData_SimpleIterator *iterator)
280 FLAC__MetaData_SimpleIteratorStatus status;
282 FLAC__ASSERT(0 != iterator);
284 status = iterator->status;
285 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
289 static FLAC__bool simple_iterator_prime_input_(FLAC__MetaData_SimpleIterator *iterator)
293 FLAC__ASSERT(0 != iterator);
295 iterator->is_writable = false;
297 if(0 == (iterator->file = fopen(iterator->filename, "r+b"))) {
298 if(errno == EACCES) {
299 if(0 == (iterator->file = fopen(iterator->filename, "rb"))) {
300 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
305 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
310 iterator->is_writable = true;
313 ret = seek_to_first_metadata_block_(iterator->file);
317 iterator->first_offset = iterator->offset[iterator->depth] = ftell(iterator->file);
318 return read_metadata_block_header_(iterator);
320 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
323 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE;
332 @@@ If we decide to finish implementing this, put this comment back in metadata.h
334 * The 'tempfile_path_prefix' allows you to specify a directory where
335 * tempfiles should go. Remember that if your metadata edits cause the
336 * FLAC file to grow, the entire file will have to be rewritten. If
337 * 'tempfile_path_prefix' is NULL, the temp file will be written in the
338 * same directory as the original FLAC file. This makes replacing the
339 * original with the tempfile fast but requires extra space in the same
340 * partition for the tempfile. If space is a problem, you can pass a
341 * directory name belonging to a different partition in
342 * 'tempfile_path_prefix'. Note that you should use the forward slash
343 * '/' as the directory separator. A trailing slash is not needed; it
344 * will be added automatically.
346 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__MetaData_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats, const char *tempfile_path_prefix);
349 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__MetaData_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats)
351 const char *tempfile_path_prefix = 0; /*@@@ search for comments near 'rename(...)' for what it will take to finish implementing this */
353 FLAC__ASSERT(0 != iterator);
354 FLAC__ASSERT(0 != filename);
356 simple_iterator_free_guts_(iterator);
358 if(preserve_file_stats)
359 iterator->has_stats = get_file_stats_(filename, &iterator->stats);
361 if(0 == (iterator->filename = strdup(filename))) {
362 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
365 if(0 != tempfile_path_prefix && 0 == (iterator->tempfile_path_prefix = strdup(tempfile_path_prefix))) {
366 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
370 return simple_iterator_prime_input_(iterator);
373 FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__MetaData_SimpleIterator *iterator)
375 FLAC__ASSERT(0 != iterator);
376 FLAC__ASSERT(0 != iterator->file);
378 return iterator->is_writable;
381 FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__MetaData_SimpleIterator *iterator)
383 FLAC__ASSERT(0 != iterator);
384 FLAC__ASSERT(0 != iterator->file);
386 if(iterator->is_last)
389 if(0 != fseek(iterator->file, iterator->length, SEEK_CUR)) {
390 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
394 iterator->offset[iterator->depth] = ftell(iterator->file);
396 return read_metadata_block_header_(iterator);
399 FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__MetaData_SimpleIterator *iterator)
403 FLAC__ASSERT(0 != iterator);
404 FLAC__ASSERT(0 != iterator->file);
406 if(iterator->offset[iterator->depth] == iterator->first_offset)
409 if(0 != fseek(iterator->file, iterator->first_offset, SEEK_SET)) {
410 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
413 this_offset = iterator->first_offset;
414 if(!read_metadata_block_header_(iterator))
417 /* we ignore any error from ftell() and catch it in fseek() */
418 while(ftell(iterator->file) + (long)iterator->length < iterator->offset[iterator->depth]) {
419 if(0 != fseek(iterator->file, iterator->length, SEEK_CUR)) {
420 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
423 this_offset = ftell(iterator->file);
424 if(!read_metadata_block_header_(iterator))
428 iterator->offset[iterator->depth] = this_offset;
433 FLAC__MetaDataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__MetaData_SimpleIterator *iterator)
435 FLAC__ASSERT(0 != iterator);
436 FLAC__ASSERT(0 != iterator->file);
438 return iterator->type;
441 FLAC__StreamMetaData *FLAC__metadata_simple_iterator_get_block(FLAC__MetaData_SimpleIterator *iterator)
443 FLAC__StreamMetaData *block = FLAC__metadata_object_new(iterator->type);
445 FLAC__ASSERT(0 != iterator);
446 FLAC__ASSERT(0 != iterator->file);
449 block->is_last = iterator->is_last;
450 block->length = iterator->length;
452 if(!read_metadata_block_data_(iterator, block)) {
453 FLAC__metadata_object_delete(block);
457 /* back up to the beginning of the block data to stay consistent */
458 if(0 != fseek(iterator->file, iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH, SEEK_SET)) {
459 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
460 FLAC__metadata_object_delete(block);
465 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
470 FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__MetaData_SimpleIterator *iterator, FLAC__StreamMetaData *block, FLAC__bool use_padding)
472 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth];)
475 FLAC__ASSERT(0 != iterator);
476 FLAC__ASSERT(0 != iterator->file);
478 if(!iterator->is_writable) {
479 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE;
483 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO || block->type == FLAC__METADATA_TYPE_STREAMINFO) {
484 if(iterator->type != block->type) {
485 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
490 block->is_last = iterator->is_last;
492 if(iterator->length == block->length)
493 return write_metadata_block_stationary_(iterator, block);
494 else if(iterator->length > block->length) {
495 if(use_padding && iterator->length >= FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) {
496 ret = write_metadata_block_stationary_with_padding_(iterator, block, iterator->length - FLAC__STREAM_METADATA_HEADER_LENGTH - block->length, block->is_last);
497 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
498 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
502 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
503 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
504 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
508 else /* iterator->length < block->length */ {
509 unsigned padding_leftover = 0;
510 FLAC__bool padding_is_last = false;
512 /* first see if we can even use padding */
513 if(iterator->is_last) {
517 const unsigned extra_padding_bytes_required = block->length - iterator->length;
518 simple_iterator_push_(iterator);
519 if(!FLAC__metadata_simple_iterator_next(iterator)) {
520 (void)simple_iterator_pop_(iterator);
523 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
527 if(FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length == extra_padding_bytes_required) {
528 padding_leftover = 0;
529 block->is_last = iterator->is_last;
531 else if(iterator->length < extra_padding_bytes_required)
534 padding_leftover = FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length - extra_padding_bytes_required;
535 padding_is_last = iterator->is_last;
536 block->is_last = false;
539 if(!simple_iterator_pop_(iterator))
544 if(padding_leftover == 0) {
545 ret = write_metadata_block_stationary_(iterator, block);
546 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
547 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
551 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
552 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
553 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
554 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
559 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
560 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
561 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
567 FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__MetaData_SimpleIterator *iterator, FLAC__StreamMetaData *block, FLAC__bool use_padding)
569 unsigned padding_leftover = 0;
570 FLAC__bool padding_is_last = false;
572 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length;)
575 FLAC__ASSERT(0 != iterator);
576 FLAC__ASSERT(0 != iterator->file);
578 if(!iterator->is_writable)
581 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) {
582 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
586 block->is_last = iterator->is_last;
589 /* first see if we can even use padding */
590 if(iterator->is_last) {
594 simple_iterator_push_(iterator);
595 if(!FLAC__metadata_simple_iterator_next(iterator)) {
596 (void)simple_iterator_pop_(iterator);
599 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
603 if(iterator->length == block->length) {
604 padding_leftover = 0;
605 block->is_last = iterator->is_last;
607 else if(iterator->length < FLAC__STREAM_METADATA_HEADER_LENGTH + block->length)
610 padding_leftover = iterator->length - block->length;
611 padding_is_last = iterator->is_last;
612 block->is_last = false;
615 if(!simple_iterator_pop_(iterator))
620 /* move to the next block, which is suitable padding */
621 if(!FLAC__metadata_simple_iterator_next(iterator))
623 if(padding_leftover == 0) {
624 ret = write_metadata_block_stationary_(iterator, block);
625 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
626 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
630 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
631 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
632 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
633 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
638 ret = rewrite_whole_file_(iterator, block, /*append=*/true);
639 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
640 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
645 FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__MetaData_SimpleIterator *iterator, FLAC__bool use_padding)
647 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth];)
650 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO) {
651 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
656 FLAC__StreamMetaData *padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
658 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
661 padding->length = iterator->length;
662 if(!FLAC__metadata_simple_iterator_set_block(iterator, padding, false)) {
663 FLAC__metadata_object_delete(padding);
666 FLAC__metadata_object_delete(padding);
667 if(!FLAC__metadata_simple_iterator_prev(iterator))
669 FLAC__ASSERT(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length == debug_target_offset);
670 FLAC__ASSERT(ftell(iterator->file) + (long)iterator->length == debug_target_offset);
674 ret = rewrite_whole_file_(iterator, 0, /*append=*/false);
675 FLAC__ASSERT(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length == debug_target_offset);
676 FLAC__ASSERT(ftell(iterator->file) + (long)iterator->length == debug_target_offset);
683 /****************************************************************************
685 * Level 2 implementation
687 ***************************************************************************/
690 typedef struct FLAC__MetaData_Node {
691 FLAC__StreamMetaData *data;
692 struct FLAC__MetaData_Node *prev, *next;
693 } FLAC__MetaData_Node;
695 struct FLAC__MetaData_Chain {
697 FLAC__MetaData_Node *head;
698 FLAC__MetaData_Node *tail;
700 FLAC__MetaData_ChainStatus status;
701 long first_offset, last_offset; /*@@@ 2G limit */
703 * This is the length of the chain initially read from the FLAC file.
704 * it is used to compare against the current_length to decide whether
705 * or not the whole file has to be rewritten.
707 unsigned initial_length; /*@@@ 4G limit */
708 unsigned current_length; /*@@@ 4G limit */
711 struct FLAC__MetaData_Iterator {
712 FLAC__MetaData_Chain *chain;
713 FLAC__MetaData_Node *current;
716 const char * const FLAC__MetaData_ChainStatusString[] = {
717 "FLAC__METADATA_CHAIN_STATUS_OK",
718 "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT",
719 "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE",
720 "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE",
721 "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE",
722 "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA",
723 "FLAC__METADATA_CHAIN_STATUS_READ_ERROR",
724 "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR",
725 "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR",
726 "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR",
727 "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR",
728 "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR",
729 "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR"
733 static FLAC__MetaData_Node *node_new_()
735 FLAC__MetaData_Node *node = (FLAC__MetaData_Node*)malloc(sizeof(FLAC__MetaData_Node));
737 memset(node, 0, sizeof(FLAC__MetaData_Node));
741 static void node_delete_(FLAC__MetaData_Node *node)
743 FLAC__ASSERT(0 != node);
745 FLAC__metadata_object_delete(node->data);
749 static void chain_append_node_(FLAC__MetaData_Chain *chain, FLAC__MetaData_Node *node)
751 FLAC__ASSERT(0 != chain);
752 FLAC__ASSERT(0 != node);
753 FLAC__ASSERT(0 != node->data);
755 node->next = node->prev = 0;
756 node->data->is_last = true;
758 chain->tail->data->is_last = false;
763 FLAC__ASSERT(0 != chain->tail);
764 chain->tail->next = node;
765 node->prev = chain->tail;
769 chain->current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
772 static void chain_remove_node_(FLAC__MetaData_Chain *chain, FLAC__MetaData_Node *node)
774 FLAC__ASSERT(0 != chain);
775 FLAC__ASSERT(0 != node);
777 if(node == chain->head)
778 chain->head = node->next;
780 node->prev->next = node->next;
782 if(node == chain->tail)
783 chain->tail = node->prev;
785 node->next->prev = node->prev;
788 chain->tail->data->is_last = true;
791 chain->current_length -= (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
794 static void chain_delete_node_(FLAC__MetaData_Chain *chain, FLAC__MetaData_Node *node)
796 chain_remove_node_(chain, node);
800 static void iterator_insert_node_(FLAC__MetaData_Iterator *iterator, FLAC__MetaData_Node *node)
802 FLAC__ASSERT(0 != node);
803 FLAC__ASSERT(0 != node->data);
804 FLAC__ASSERT(0 != iterator);
805 FLAC__ASSERT(0 != iterator->current);
806 FLAC__ASSERT(0 != iterator->chain);
807 FLAC__ASSERT(0 != iterator->chain->head);
808 FLAC__ASSERT(0 != iterator->chain->tail);
810 node->data->is_last = false;
812 node->prev = iterator->current->prev;
813 node->next = iterator->current;
816 iterator->chain->head = node;
818 node->prev->next = node;
820 iterator->current->prev = node;
822 iterator->chain->nodes++;
823 iterator->chain->current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
826 static void iterator_insert_node_after_(FLAC__MetaData_Iterator *iterator, FLAC__MetaData_Node *node)
828 FLAC__ASSERT(0 != node);
829 FLAC__ASSERT(0 != node->data);
830 FLAC__ASSERT(0 != iterator);
831 FLAC__ASSERT(0 != iterator->current);
832 FLAC__ASSERT(0 != iterator->chain);
833 FLAC__ASSERT(0 != iterator->chain->head);
834 FLAC__ASSERT(0 != iterator->chain->tail);
836 iterator->current->data->is_last = false;
838 node->prev = iterator->current;
839 node->next = iterator->current->next;
842 iterator->chain->tail = node;
844 node->next->prev = node;
846 node->prev->next = node;
848 iterator->chain->tail->data->is_last = true;
850 iterator->chain->nodes++;
851 iterator->chain->current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
854 /* return true iff node and node->next are both padding */
855 static FLAC__bool chain_merge_adjacent_padding_(FLAC__MetaData_Chain *chain, FLAC__MetaData_Node *node)
857 if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) {
858 const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length;
859 node->data->length += growth;
860 chain->current_length += growth;
862 chain_delete_node_(chain, node->next);
869 FLAC__MetaData_Chain *FLAC__metadata_chain_new()
871 FLAC__MetaData_Chain *chain = malloc(sizeof(FLAC__MetaData_Chain));
875 chain->head = chain->tail = 0;
877 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
878 chain->initial_length = chain->current_length = 0;
884 void FLAC__metadata_chain_delete(FLAC__MetaData_Chain *chain)
886 FLAC__MetaData_Node *node, *next;
888 FLAC__ASSERT(0 != chain);
890 for(node = chain->head; node; ) {
896 if(0 != chain->filename)
897 free(chain->filename);
902 FLAC__MetaData_ChainStatus FLAC__metadata_chain_status(FLAC__MetaData_Chain *chain)
904 FLAC__MetaData_ChainStatus status;
906 FLAC__ASSERT(0 != chain);
908 status = chain->status;
909 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
913 FLAC__bool FLAC__metadata_chain_read(FLAC__MetaData_Chain *chain, const char *filename)
915 FLAC__MetaData_SimpleIterator *iterator;
916 FLAC__MetaData_Node *node;
918 FLAC__ASSERT(0 != chain);
919 FLAC__ASSERT(0 != filename);
921 if(0 == (chain->filename = strdup(filename))) {
922 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
926 if(0 == (iterator = FLAC__metadata_simple_iterator_new())) {
927 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
931 if(!FLAC__metadata_simple_iterator_init(iterator, filename, /*preserve_file_stats=*/false)) {
932 chain->status = get_equivalent_status_(iterator->status);
936 chain->first_offset = iterator->offset[iterator->depth];
941 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
944 node->data = FLAC__metadata_simple_iterator_get_block(iterator);
945 if(0 == node->data) {
947 chain->status = get_equivalent_status_(iterator->status);
950 chain_append_node_(chain, node);
951 } while(FLAC__metadata_simple_iterator_next(iterator));
953 if(!iterator->is_last || iterator->status != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) {
954 chain->status = get_equivalent_status_(iterator->status);
958 chain->last_offset = ftell(iterator->file) + iterator->length;
959 FLAC__metadata_simple_iterator_delete(iterator);
961 chain->initial_length = chain->current_length;
965 FLAC__bool FLAC__metadata_chain_write(FLAC__MetaData_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats)
968 const char *tempfile_path_prefix = 0;
971 if(chain->current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
972 const unsigned delta = chain->initial_length - chain->current_length;
973 chain->tail->data->length += delta;
974 chain->current_length += delta;
975 FLAC__ASSERT(chain->current_length == chain->initial_length);
977 else if(chain->current_length + FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
978 FLAC__StreamMetaData *padding;
979 FLAC__MetaData_Node *node;
980 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) {
981 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
984 padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + chain->current_length);
985 if(0 == (node = node_new_())) {
986 FLAC__metadata_object_delete(padding);
987 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
990 node->data = padding;
991 chain_append_node_(chain, node);
992 FLAC__ASSERT(chain->current_length == chain->initial_length);
994 else if(chain->current_length > chain->initial_length) {
995 const unsigned delta = chain->current_length - chain->initial_length;
996 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
997 if(chain->tail->data->length + FLAC__STREAM_METADATA_HEADER_LENGTH == delta) {
998 chain_delete_node_(chain, chain->tail);
999 FLAC__ASSERT(chain->current_length == chain->initial_length);
1001 else if(chain->tail->data->length >= delta) {
1002 chain->tail->data->length -= delta;
1003 chain->current_length -= delta;
1004 FLAC__ASSERT(chain->current_length == chain->initial_length);
1010 if(preserve_file_stats)
1011 get_file_stats_(chain->filename, &stats);
1013 if(chain->current_length == chain->initial_length) {
1014 if(!chain_rewrite_chain_(chain))
1018 if(!chain_rewrite_file_(chain, tempfile_path_prefix))
1022 if(preserve_file_stats)
1023 set_file_stats_(chain->filename, &stats);
1025 /* recompute lengths and offsets if necessary */
1026 if(chain->initial_length != chain->current_length) {
1027 const FLAC__MetaData_Node *node;
1028 chain->initial_length = chain->current_length;
1029 chain->last_offset = chain->first_offset;
1030 for(node = chain->head; node; node = node->next)
1031 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1037 void FLAC__metadata_chain_merge_padding(FLAC__MetaData_Chain *chain)
1039 FLAC__MetaData_Node *node;
1041 FLAC__ASSERT(0 != chain);
1043 for(node = chain->head; node; ) {
1044 if(!chain_merge_adjacent_padding_(chain, node))
1049 void FLAC__metadata_chain_sort_padding(FLAC__MetaData_Chain *chain)
1051 FLAC__MetaData_Node *node, *save;
1054 FLAC__ASSERT(0 != chain);
1057 * Don't try and be too smart... this simple algo is good enough for
1058 * the small number of nodes that we deal with.
1060 for(i = 0, node = chain->head; i < chain->nodes; i++) {
1061 if(node->data->type == FLAC__METADATA_TYPE_PADDING) {
1063 chain_remove_node_(chain, node);
1064 chain_append_node_(chain, node);
1072 FLAC__metadata_chain_merge_padding(chain);
1076 FLAC__MetaData_Iterator *FLAC__metadata_iterator_new()
1078 FLAC__MetaData_Iterator *iterator = malloc(sizeof(FLAC__MetaData_Iterator));
1081 iterator->current = 0;
1082 iterator->chain = 0;
1088 void FLAC__metadata_iterator_delete(FLAC__MetaData_Iterator *iterator)
1090 FLAC__ASSERT(0 != iterator);
1096 * Initialize the iterator to point to the first metadata block in the
1099 void FLAC__metadata_iterator_init(FLAC__MetaData_Iterator *iterator, FLAC__MetaData_Chain *chain)
1101 FLAC__ASSERT(0 != iterator);
1102 FLAC__ASSERT(0 != chain);
1103 FLAC__ASSERT(0 != chain->head);
1105 iterator->chain = chain;
1106 iterator->current = chain->head;
1109 FLAC__bool FLAC__metadata_iterator_next(FLAC__MetaData_Iterator *iterator)
1111 FLAC__ASSERT(0 != iterator);
1113 if(0 == iterator->current || 0 == iterator->current->next)
1116 iterator->current = iterator->current->next;
1120 FLAC__bool FLAC__metadata_iterator_prev(FLAC__MetaData_Iterator *iterator)
1122 FLAC__ASSERT(0 != iterator);
1124 if(0 == iterator->current || 0 == iterator->current->prev)
1127 iterator->current = iterator->current->prev;
1131 FLAC__MetaDataType FLAC__metadata_iterator_get_block_type(const FLAC__MetaData_Iterator *iterator)
1133 FLAC__ASSERT(0 != iterator);
1134 FLAC__ASSERT(0 != iterator->current);
1135 FLAC__ASSERT(0 != iterator->current->data);
1137 return iterator->current->data->type;
1140 FLAC__StreamMetaData *FLAC__metadata_iterator_get_block(FLAC__MetaData_Iterator *iterator)
1142 FLAC__ASSERT(0 != iterator);
1143 FLAC__ASSERT(0 != iterator->current);
1145 return iterator->current->data;
1148 FLAC__bool FLAC__metadata_iterator_set_block(FLAC__MetaData_Iterator *iterator, FLAC__StreamMetaData *block)
1150 return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block);
1153 FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__MetaData_Iterator *iterator, FLAC__bool replace_with_padding)
1155 FLAC__MetaData_Node *save;
1157 FLAC__ASSERT(0 != iterator);
1158 FLAC__ASSERT(0 != iterator->current);
1160 if(0 == iterator->current->prev) {
1161 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1165 save = iterator->current->prev;
1167 if(replace_with_padding) {
1168 FLAC__metadata_object_delete_data(iterator->current->data);
1169 iterator->current->data->type = FLAC__METADATA_TYPE_PADDING;
1172 chain_delete_node_(iterator->chain, iterator->current);
1175 iterator->current = save;
1179 FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__MetaData_Iterator *iterator, FLAC__StreamMetaData *block)
1181 FLAC__MetaData_Node *node;
1183 FLAC__ASSERT(0 != iterator);
1184 FLAC__ASSERT(0 != iterator->current);
1186 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1189 if(0 == iterator->current->prev) {
1190 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1194 if(0 == (node = node_new_()))
1198 iterator_insert_node_(iterator, node);
1199 iterator->current = node;
1203 FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__MetaData_Iterator *iterator, FLAC__StreamMetaData *block)
1205 FLAC__MetaData_Node *node;
1207 FLAC__ASSERT(0 != iterator);
1208 FLAC__ASSERT(0 != iterator->current);
1210 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1213 if(0 == (node = node_new_()))
1217 iterator_insert_node_after_(iterator, node);
1218 iterator->current = node;
1223 /****************************************************************************
1225 * Local function definitions
1227 ***************************************************************************/
1229 void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1235 for(i = 0; i < bytes; i++) {
1236 *(--b) = (FLAC__byte)(val & 0xff);
1241 void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1245 for(i = 0; i < bytes; i++) {
1246 *(b++) = (FLAC__byte)(val & 0xff);
1251 void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes)
1257 for(i = 0; i < bytes; i++) {
1258 *(--b) = (FLAC__byte)(val & 0xff);
1263 FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes)
1265 FLAC__uint32 ret = 0;
1268 for(i = 0; i < bytes; i++)
1269 ret = (ret << 8) | (FLAC__uint32)(*b++);
1274 FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes)
1276 FLAC__uint32 ret = 0;
1281 for(i = 0; i < bytes; i++)
1282 ret = (ret << 8) | (FLAC__uint32)(*--b);
1287 FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes)
1289 FLAC__uint64 ret = 0;
1292 for(i = 0; i < bytes; i++)
1293 ret = (ret << 8) | (FLAC__uint64)(*b++);
1298 FLAC__bool read_metadata_block_header_(FLAC__MetaData_SimpleIterator *iterator)
1300 FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH];
1302 FLAC__ASSERT(0 != iterator);
1303 FLAC__ASSERT(0 != iterator->file);
1305 if(fread(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, iterator->file) != FLAC__STREAM_METADATA_HEADER_LENGTH) {
1306 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1310 iterator->is_last = raw_header[0] & 0x80? true : false;
1311 iterator->type = (FLAC__MetaDataType)(raw_header[0] & 0x7f);
1312 iterator->length = unpack_uint32_(raw_header + 1, 3);
1314 /* do some checking */
1315 if(iterator->type > FLAC__METADATA_TYPE_VORBIS_COMMENT) {
1316 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA;
1323 FLAC__bool read_metadata_block_data_(FLAC__MetaData_SimpleIterator *iterator, FLAC__StreamMetaData *block)
1325 FLAC__ASSERT(0 != iterator);
1326 FLAC__ASSERT(0 != iterator->file);
1328 switch(block->type) {
1329 case FLAC__METADATA_TYPE_STREAMINFO:
1330 iterator->status = read_metadata_block_data_streaminfo_(iterator->file, &block->data.stream_info);
1332 case FLAC__METADATA_TYPE_PADDING:
1333 iterator->status = read_metadata_block_data_padding_(iterator->file, &block->data.padding, block->length);
1335 case FLAC__METADATA_TYPE_APPLICATION:
1336 iterator->status = read_metadata_block_data_application_(iterator->file, &block->data.application, block->length);
1338 case FLAC__METADATA_TYPE_SEEKTABLE:
1339 iterator->status = read_metadata_block_data_seektable_(iterator->file, &block->data.seek_table, block->length);
1341 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1342 iterator->status = read_metadata_block_data_vorbis_comment_(iterator->file, &block->data.vorbis_comment);
1346 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR;
1349 return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1352 FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_streaminfo_(FILE *file, FLAC__StreamMetaData_StreamInfo *block)
1354 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b;
1356 FLAC__ASSERT(0 != file);
1358 if(fread(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, file) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1359 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1363 /* @@@ we are using hardcoded numbers for simplicity but we should
1364 * probably eventually write a bit-level unpacker and use the
1365 * _STREAMINFO_ constants.
1367 block->min_blocksize = unpack_uint32_(b, 2); b += 2;
1368 block->max_blocksize = unpack_uint32_(b, 2); b += 2;
1369 block->min_framesize = unpack_uint32_(b, 3); b += 3;
1370 block->max_framesize = unpack_uint32_(b, 3); b += 3;
1371 block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4);
1372 block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
1373 block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 1) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1;
1374 block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4);
1375 memcpy(block->md5sum, b+8, 16);
1377 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1381 FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_padding_(FILE *file, FLAC__StreamMetaData_Padding *block, unsigned block_length)
1383 FLAC__ASSERT(0 != file);
1385 (void)block; /* nothing to do; we don't care about reading the padding bytes */
1387 if(0 != fseek(file, block_length, SEEK_CUR))
1388 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1390 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1393 FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_application_(FILE *file, FLAC__StreamMetaData_Application *block, unsigned block_length)
1395 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1397 FLAC__ASSERT(0 != file);
1399 if(fread(block->id, 1, id_bytes, file) != id_bytes)
1400 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1402 block_length -= id_bytes;
1404 if(block_length == 0) {
1408 if(0 == (block->data = malloc(block_length)))
1409 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1411 if(fread(block->data, 1, block_length, file) != block_length)
1412 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1415 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1418 FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_seektable_(FILE *file, FLAC__StreamMetaData_SeekTable *block, unsigned block_length)
1421 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1423 FLAC__ASSERT(0 != file);
1424 FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0);
1426 block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1428 if(block->num_points == 0)
1430 else if(0 == (block->points = malloc(block->num_points * sizeof(FLAC__StreamMetaData_SeekPoint))))
1431 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1433 for(i = 0; i < block->num_points; i++) {
1434 if(fread(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, file) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1435 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1436 /*@@@ some MAGIC NUMBERs here */
1437 block->points[i].sample_number = unpack_uint64_(buffer, 8);
1438 block->points[i].stream_offset = unpack_uint64_(buffer+8, 8);
1439 block->points[i].frame_samples = unpack_uint32_(buffer+16, 2);
1442 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1445 FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_(FILE *file, FLAC__StreamMetaData_VorbisComment_Entry *entry)
1447 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1448 FLAC__byte buffer[4]; /* magic number is asserted below */
1450 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8 == 4);
1451 FLAC__ASSERT(0 != file);
1453 if(fread(buffer, 1, entry_length_len, file) != entry_length_len)
1454 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1455 entry->length = unpack_uint32_little_endian_(buffer, entry_length_len);
1457 if(entry->length == 0) {
1461 if(0 == (entry->entry = malloc(entry->length)))
1462 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1464 if(fread(entry->entry, 1, entry->length, file) != entry->length)
1465 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1468 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1471 FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_(FILE *file, FLAC__StreamMetaData_VorbisComment *block)
1474 FLAC__MetaData_SimpleIteratorStatus status;
1475 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
1476 FLAC__byte buffer[4]; /* magic number is asserted below */
1478 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8 == 4);
1479 FLAC__ASSERT(0 != file);
1481 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_(file, &(block->vendor_string))))
1484 if(fread(buffer, 1, num_comments_len, file) != num_comments_len)
1485 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1486 block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len);
1488 if(block->num_comments == 0) {
1489 block->comments = 0;
1491 else if(0 == (block->comments = malloc(block->num_comments * sizeof(FLAC__StreamMetaData_VorbisComment_Entry))))
1492 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1494 for(i = 0; i < block->num_comments; i++) {
1495 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_(file, block->comments + i)))
1499 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1502 FLAC__bool write_metadata_block_header_(FILE *file, FLAC__MetaData_SimpleIteratorStatus *status, const FLAC__StreamMetaData *block)
1504 FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH];
1506 FLAC__ASSERT(0 != file);
1507 FLAC__ASSERT(0 != status);
1508 FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
1510 buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type;
1511 pack_uint32_(block->length, buffer + 1, 3);
1513 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, file) != FLAC__STREAM_METADATA_HEADER_LENGTH) {
1514 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1521 FLAC__bool write_metadata_block_data_(FILE *file, FLAC__MetaData_SimpleIteratorStatus *status, const FLAC__StreamMetaData *block)
1523 FLAC__ASSERT(0 != file);
1524 FLAC__ASSERT(0 != status);
1526 switch(block->type) {
1527 case FLAC__METADATA_TYPE_STREAMINFO:
1528 *status = write_metadata_block_data_streaminfo_(file, &block->data.stream_info);
1530 case FLAC__METADATA_TYPE_PADDING:
1531 *status = write_metadata_block_data_padding_(file, &block->data.padding, block->length);
1533 case FLAC__METADATA_TYPE_APPLICATION:
1534 *status = write_metadata_block_data_application_(file, &block->data.application, block->length);
1536 case FLAC__METADATA_TYPE_SEEKTABLE:
1537 *status = write_metadata_block_data_seektable_(file, &block->data.seek_table);
1539 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1540 *status = write_metadata_block_data_vorbis_comment_(file, &block->data.vorbis_comment);
1544 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR;
1546 return (*status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1549 FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_streaminfo_(FILE *file, const FLAC__StreamMetaData_StreamInfo *block)
1551 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH];
1552 const unsigned channels1 = block->channels - 1;
1553 const unsigned bps1 = block->bits_per_sample - 1;
1555 FLAC__ASSERT(0 != file);
1557 /* @@@ we are using hardcoded numbers for simplicity but we should
1558 * probably eventually write a bit-level packer and use the
1559 * _STREAMINFO_ constants.
1561 pack_uint32_(block->min_blocksize, buffer, 2);
1562 pack_uint32_(block->max_blocksize, buffer+2, 2);
1563 pack_uint32_(block->min_framesize, buffer+4, 3);
1564 pack_uint32_(block->max_framesize, buffer+7, 3);
1565 buffer[10] = (block->sample_rate >> 12) & 0xff;
1566 buffer[11] = (block->sample_rate >> 4) & 0xff;
1567 buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4);
1568 buffer[13] = (FLAC__byte)(((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f));
1569 pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4);
1570 memcpy(buffer+18, block->md5sum, 16);
1572 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, file) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1573 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1575 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1578 FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_padding_(FILE *file, const FLAC__StreamMetaData_Padding *block, unsigned block_length)
1580 unsigned i, n = block_length;
1581 FLAC__byte buffer[1024];
1583 FLAC__ASSERT(0 != file);
1587 memset(buffer, 0, 1024);
1589 for(i = 0; i < n/1024; i++)
1590 if(fwrite(buffer, 1, 1024, file) != 1024)
1591 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1595 if(fwrite(buffer, 1, n, file) != n)
1596 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1598 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1601 FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_application_(FILE *file, const FLAC__StreamMetaData_Application *block, unsigned block_length)
1603 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1605 FLAC__ASSERT(0 != file);
1607 if(fwrite(block->id, 1, id_bytes, file) != id_bytes)
1608 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1610 block_length -= id_bytes;
1612 if(fwrite(block->data, 1, block_length, file) != block_length)
1613 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1615 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1618 FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_seektable_(FILE *file, const FLAC__StreamMetaData_SeekTable *block)
1621 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1623 FLAC__ASSERT(0 != file);
1625 for(i = 0; i < block->num_points; i++) {
1626 /*@@@ some MAGIC NUMBERs here */
1627 pack_uint64_(block->points[i].sample_number, buffer, 8);
1628 pack_uint64_(block->points[i].stream_offset, buffer+8, 8);
1629 pack_uint32_(block->points[i].frame_samples, buffer+16, 2);
1630 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, file) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1631 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1634 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1637 FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_vorbis_comment_(FILE *file, const FLAC__StreamMetaData_VorbisComment *block)
1640 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1641 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
1642 FLAC__byte buffer[4]; /* magic number is asserted below */
1644 FLAC__ASSERT(max(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8 == 4);
1645 FLAC__ASSERT(0 != file);
1647 pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len);
1648 if(fwrite(buffer, 1, entry_length_len, file) != entry_length_len)
1649 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1650 if(fwrite(block->vendor_string.entry, 1, block->vendor_string.length, file) != block->vendor_string.length)
1651 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1653 pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len);
1654 if(fwrite(buffer, 1, num_comments_len, file) != num_comments_len)
1655 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1657 for(i = 0; i < block->num_comments; i++) {
1658 pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len);
1659 if(fwrite(buffer, 1, entry_length_len, file) != entry_length_len)
1660 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1661 if(fwrite(block->comments[i].entry, 1, block->comments[i].length, file) != block->comments[i].length)
1662 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1665 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1668 FLAC__bool write_metadata_block_stationary_(FLAC__MetaData_SimpleIterator *iterator, const FLAC__StreamMetaData *block)
1670 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1671 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1675 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
1678 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
1681 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1682 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1686 return read_metadata_block_header_(iterator);
1689 FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__MetaData_SimpleIterator *iterator, FLAC__StreamMetaData *block, unsigned padding_length, FLAC__bool padding_is_last)
1691 FLAC__StreamMetaData *padding;
1693 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1694 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1698 block->is_last = false;
1700 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
1703 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
1706 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)))
1707 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1709 padding->is_last = padding_is_last;
1710 padding->length = padding_length;
1712 if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) {
1713 FLAC__metadata_object_delete(padding);
1717 if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) {
1718 FLAC__metadata_object_delete(padding);
1722 FLAC__metadata_object_delete(padding);
1724 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1725 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1729 return read_metadata_block_header_(iterator);
1732 FLAC__bool rewrite_whole_file_(FLAC__MetaData_SimpleIterator *iterator, FLAC__StreamMetaData *block, FLAC__bool append)
1736 int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */
1737 long fixup_is_last_flag_offset = -1;
1739 FLAC__ASSERT(0 != block || append == false);
1741 if(iterator->is_last) {
1743 fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */
1744 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
1746 else if(0 == block) {
1747 simple_iterator_push_(iterator);
1748 if(!FLAC__metadata_simple_iterator_prev(iterator)) {
1749 (void)simple_iterator_pop_(iterator);
1752 fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */
1753 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
1754 if(!simple_iterator_pop_(iterator))
1759 if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append))
1763 if(!write_metadata_block_header_(tempfile, &iterator->status, block)) {
1764 cleanup_tempfile_(&tempfile, &tempfilename);
1768 if(!write_metadata_block_data_(tempfile, &iterator->status, block)) {
1769 cleanup_tempfile_(&tempfile, &tempfilename);
1774 if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0))
1778 return FLAC__metadata_simple_iterator_next(iterator);
1783 FLAC__bool chain_rewrite_chain_(FLAC__MetaData_Chain *chain)
1786 FLAC__MetaData_Node *node;
1787 FLAC__MetaData_SimpleIteratorStatus status;
1789 FLAC__ASSERT(0 != chain);
1790 FLAC__ASSERT(0 != chain->filename);
1791 FLAC__ASSERT(0 != chain->head);
1793 if(0 == (f = fopen(chain->filename, "r+b"))) {
1794 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1797 if(0 != fseek(f, chain->first_offset, SEEK_SET)) {
1798 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1802 for(node = chain->head; node; node = node->next) {
1803 if(!write_metadata_block_header_(f, &status, node->data)) {
1804 chain->status = get_equivalent_status_(status);
1807 if(!write_metadata_block_data_(f, &status, node->data)) {
1808 chain->status = get_equivalent_status_(status);
1813 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1820 FLAC__bool chain_rewrite_file_(FLAC__MetaData_Chain *chain, const char *tempfile_path_prefix)
1824 FLAC__MetaData_SimpleIteratorStatus status;
1825 const FLAC__MetaData_Node *node;
1827 FLAC__ASSERT(0 != chain);
1828 FLAC__ASSERT(0 != chain->filename);
1829 FLAC__ASSERT(0 != chain->head);
1831 /* copy the file prefix (data up to first metadata block */
1832 if(0 == (f = fopen(chain->filename, "rb"))) {
1833 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1836 if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) {
1837 chain->status = get_equivalent_status_(status);
1838 cleanup_tempfile_(&tempfile, &tempfilename);
1841 if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) {
1842 chain->status = get_equivalent_status_(status);
1843 cleanup_tempfile_(&tempfile, &tempfilename);
1847 /* write the metadata */
1848 for(node = chain->head; node; node = node->next) {
1849 if(!write_metadata_block_header_(tempfile, &status, node->data)) {
1850 chain->status = get_equivalent_status_(status);
1853 if(!write_metadata_block_data_(tempfile, &status, node->data)) {
1854 chain->status = get_equivalent_status_(status);
1858 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1860 /* copy the file postfix (everything after the metadata) */
1861 if(0 != fseek(f, chain->last_offset, SEEK_SET)) {
1862 cleanup_tempfile_(&tempfile, &tempfilename);
1863 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1866 if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) {
1867 cleanup_tempfile_(&tempfile, &tempfilename);
1868 chain->status = get_equivalent_status_(status);
1872 /* move the tempfile on top of the original */
1874 if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status))
1880 void simple_iterator_push_(FLAC__MetaData_SimpleIterator *iterator)
1882 FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH);
1883 iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth];
1887 FLAC__bool simple_iterator_pop_(FLAC__MetaData_SimpleIterator *iterator)
1889 FLAC__ASSERT(iterator->depth > 0);
1891 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1892 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1896 return read_metadata_block_header_(iterator);
1899 unsigned seek_to_first_metadata_block_(FILE *f)
1901 FLAC__byte buffer[4];
1905 FLAC__ASSERT(0 != f);
1906 FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == 4);
1908 /* skip any id3v2 tag */
1910 n = fread(buffer, 1, 4, f);
1915 else if(0 == memcmp(buffer, "ID3", 3)) {
1916 unsigned tag_length = 0;
1918 /* skip to the tag length */
1919 if(fseek(f, 2, SEEK_CUR) < 0)
1922 /* read the length */
1923 for(i = 0; i < 4; i++) {
1924 if(fread(buffer, 1, 1, f) < 1 || buffer[0] & 0x80)
1927 tag_length |= (buffer[0] & 0x7f);
1930 /* skip the rest of the tag */
1931 if(fseek(f, tag_length, SEEK_CUR) < 0)
1934 /* read the stream sync code */
1936 n = fread(buffer, 1, 4, f);
1943 /* check for the fLaC signature */
1944 if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH))
1950 FLAC__bool simple_iterator_copy_file_prefix_(FLAC__MetaData_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append)
1952 const long offset_end = append? iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length : iterator->offset[iterator->depth];
1954 if(0 != fseek(iterator->file, 0, SEEK_SET)) {
1955 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1958 if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) {
1959 cleanup_tempfile_(tempfile, tempfilename);
1962 if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) {
1963 cleanup_tempfile_(tempfile, tempfilename);
1970 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)
1972 long save_offset = iterator->offset[iterator->depth]; /*@@@ 2G limit */
1973 FLAC__ASSERT(0 != *tempfile);
1975 if(0 != fseek(iterator->file, save_offset + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length, SEEK_SET)) {
1976 cleanup_tempfile_(tempfile, tempfilename);
1977 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1980 if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) {
1981 cleanup_tempfile_(tempfile, tempfilename);
1985 if(fixup_is_last_code != 0) {
1987 * if code == 1, it means a block was appended to the end so
1988 * we have to clear the is_last flag of the previous block
1989 * if code == -1, it means the last block was deleted so
1990 * we have to set the is_last flag of the previous block
1992 /*@@@ MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */
1994 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
1995 cleanup_tempfile_(tempfile, tempfilename);
1996 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1999 if(fread(&x, 1, 1, *tempfile) != 1) {
2000 cleanup_tempfile_(tempfile, tempfilename);
2001 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2004 if(fixup_is_last_code > 0) {
2005 FLAC__ASSERT(x & 0x80);
2009 FLAC__ASSERT(!(x & 0x80));
2012 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2013 cleanup_tempfile_(tempfile, tempfilename);
2014 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2017 if(fwrite(&x, 1, 1, *tempfile) != 1) {
2018 cleanup_tempfile_(tempfile, tempfilename);
2019 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2024 (void)fclose(iterator->file);
2026 if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status))
2029 if(iterator->has_stats)
2030 set_file_stats_(iterator->filename, &iterator->stats);
2032 if(!simple_iterator_prime_input_(iterator))
2035 while(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length < save_offset)
2036 if(!FLAC__metadata_simple_iterator_next(iterator))
2041 /* move the iterator to it's original block faster by faking a push, then doing a pop_ */
2042 FLAC__ASSERT(iterator->depth == 0);
2043 iterator->offset[0] = save_offset;
2045 return simple_iterator_pop_(iterator);
2049 FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, unsigned bytes/*@@@ 4G limit*/, FLAC__MetaData_SimpleIteratorStatus *status)
2051 FLAC__byte buffer[8192];
2055 n = min(sizeof(buffer), bytes);
2056 if(fread(buffer, 1, n, file) != n) {
2057 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2060 if(fwrite(buffer, 1, n, tempfile) != n) {
2061 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2070 FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__MetaData_SimpleIteratorStatus *status)
2072 FLAC__byte buffer[8192];
2075 while(!feof(file)) {
2076 n = fread(buffer, 1, sizeof(buffer), file);
2077 if(n == 0 && !feof(file)) {
2078 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2081 if(n > 0 && fwrite(buffer, 1, n, tempfile) != n) {
2082 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2090 FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__MetaData_SimpleIteratorStatus *status)
2092 static const char *tempfile_suffix = ".metadata_edit";
2093 if(0 == tempfile_path_prefix) {
2094 if(0 == (*tempfilename = malloc(strlen(filename) + strlen(tempfile_suffix) + 1))) {
2095 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2098 strcpy(*tempfilename, filename);
2099 strcat(*tempfilename, tempfile_suffix);
2102 const char *p = strrchr(filename, '/');
2108 if(0 == (*tempfilename = malloc(strlen(tempfile_path_prefix) + 1 + strlen(p) + strlen(tempfile_suffix) + 1))) {
2109 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2112 strcpy(*tempfilename, tempfile_path_prefix);
2113 strcat(*tempfilename, "/");
2114 strcat(*tempfilename, p);
2115 strcat(*tempfilename, tempfile_suffix);
2118 if(0 == (*tempfile = fopen(*tempfilename, "w+b"))) {
2119 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
2126 FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__MetaData_SimpleIteratorStatus *status)
2128 FLAC__ASSERT(0 != filename);
2129 FLAC__ASSERT(0 != tempfile);
2130 FLAC__ASSERT(0 != *tempfile);
2131 FLAC__ASSERT(0 != tempfilename);
2132 FLAC__ASSERT(0 != *tempfilename);
2133 FLAC__ASSERT(0 != status);
2135 (void)fclose(*tempfile);
2137 /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just rename(): */
2138 if(0 != rename(*tempfilename, filename)) {
2139 cleanup_tempfile_(tempfile, tempfilename);
2140 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR;
2144 cleanup_tempfile_(tempfile, tempfilename);
2149 void cleanup_tempfile_(FILE **tempfile, char **tempfilename)
2151 if(0 != *tempfile) {
2152 (void)fclose(*tempfile);
2156 if(0 != *tempfilename) {
2157 (void)unlink(*tempfilename);
2158 free(*tempfilename);
2163 FLAC__bool get_file_stats_(const char *filename, struct stat *stats)
2165 FLAC__ASSERT(0 != filename);
2166 FLAC__ASSERT(0 != stats);
2167 return (0 == stat(filename, stats));
2170 void set_file_stats_(const char *filename, struct stat *stats)
2172 struct utimbuf srctime;
2174 FLAC__ASSERT(0 != filename);
2175 FLAC__ASSERT(0 != stats);
2177 srctime.actime = stats->st_atime;
2178 srctime.modtime = stats->st_mtime;
2179 (void)chmod(filename, stats->st_mode);
2180 (void)utime(filename, &srctime);
2181 #if !defined _MSC_VER && !defined __MINGW32__
2182 (void)chown(filename, stats->st_uid, -1);
2183 (void)chown(filename, -1, stats->st_gid);
2187 FLAC__MetaData_ChainStatus get_equivalent_status_(FLAC__MetaData_SimpleIteratorStatus status)
2190 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK:
2191 return FLAC__METADATA_CHAIN_STATUS_OK;
2192 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT:
2193 return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT;
2194 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE:
2195 return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
2196 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE:
2197 return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
2198 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE:
2199 return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE;
2200 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA:
2201 return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA;
2202 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR:
2203 return FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
2204 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR:
2205 return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
2206 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR:
2207 return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
2208 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR:
2209 return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR;
2210 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR:
2211 return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR;
2212 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR:
2213 return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
2214 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR:
2216 return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;