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 *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);
118 FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetaData_StreamInfo *streaminfo)
120 FLAC__FileDecoder *decoder = FLAC__file_decoder_new();
125 FLAC__file_decoder_set_md5_checking(decoder, false);
126 FLAC__file_decoder_set_filename(decoder, filename);
127 FLAC__file_decoder_set_write_callback(decoder, write_callback_);
128 FLAC__file_decoder_set_metadata_callback(decoder, metadata_callback_);
129 FLAC__file_decoder_set_error_callback(decoder, error_callback_);
130 FLAC__file_decoder_set_client_data(decoder, &streaminfo);
132 if(FLAC__file_decoder_init(decoder) != FLAC__FILE_DECODER_OK)
135 if(!FLAC__file_decoder_process_metadata(decoder))
138 FLAC__file_decoder_finish(decoder);
139 FLAC__file_decoder_delete(decoder);
141 return 0 != streaminfo; /* the metadata_callback_() will set streaminfo to 0 on an error */
144 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data)
146 (void)decoder, (void)frame, (void)buffer, (void)client_data;
148 return FLAC__STREAM_DECODER_WRITE_CONTINUE;
151 void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data)
153 FLAC__StreamMetaData_StreamInfo **streaminfo = (FLAC__StreamMetaData_StreamInfo **)client_data;
156 if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO && 0 != *streaminfo)
157 **streaminfo = metadata->data.stream_info;
160 void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
162 FLAC__StreamMetaData_StreamInfo **streaminfo = (FLAC__StreamMetaData_StreamInfo **)client_data;
165 if(status != FLAC__STREAM_DECODER_ERROR_LOST_SYNC)
170 /****************************************************************************
172 * Level 1 implementation
174 ***************************************************************************/
176 #define SIMPLE_ITERATOR_MAX_PUSH_DEPTH (1+4)
177 /* 1 for initial offset, +4 for our own personal use */
179 struct FLAC__MetaData_SimpleIterator {
181 char *filename, *tempfile_path_prefix;
183 FLAC__bool has_stats;
184 FLAC__bool is_writable;
185 FLAC__MetaData_SimpleIteratorStatus status;
186 /*@@@ 2G limits here because of the offset type: */
187 long offset[SIMPLE_ITERATOR_MAX_PUSH_DEPTH];
188 long first_offset; /* this is the offset to the STREAMINFO block */
190 /* this is the metadata block header of the current block we are pointing to: */
192 FLAC__MetaDataType type;
196 const char *FLAC__MetaData_SimpleIteratorStatusString[] = {
197 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK",
198 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT",
199 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE",
200 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE",
201 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE",
202 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA",
203 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR",
204 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR",
205 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR",
206 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR",
207 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR",
208 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR",
209 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR"
213 FLAC__MetaData_SimpleIterator *FLAC__metadata_simple_iterator_new()
215 FLAC__MetaData_SimpleIterator *iterator = malloc(sizeof(FLAC__MetaData_SimpleIterator));
219 iterator->filename = 0;
220 iterator->tempfile_path_prefix = 0;
221 iterator->has_stats = false;
222 iterator->is_writable = false;
223 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
224 iterator->first_offset = iterator->offset[0] = -1;
231 static void simple_iterator_free_guts_(FLAC__MetaData_SimpleIterator *iterator)
233 FLAC__ASSERT(0 != iterator);
235 if(0 != iterator->file) {
236 fclose(iterator->file);
238 if(iterator->has_stats)
239 set_file_stats_(iterator->filename, &iterator->stats);
241 if(0 != iterator->filename) {
242 free(iterator->filename);
243 iterator->filename = 0;
245 if(0 != iterator->tempfile_path_prefix) {
246 free(iterator->tempfile_path_prefix);
247 iterator->tempfile_path_prefix = 0;
251 void FLAC__metadata_simple_iterator_delete(FLAC__MetaData_SimpleIterator *iterator)
253 FLAC__ASSERT(0 != iterator);
255 simple_iterator_free_guts_(iterator);
259 FLAC__MetaData_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__MetaData_SimpleIterator *iterator)
261 FLAC__MetaData_SimpleIteratorStatus status;
263 FLAC__ASSERT(0 != iterator);
265 status = iterator->status;
266 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
270 static FLAC__bool simple_iterator_prime_input_(FLAC__MetaData_SimpleIterator *iterator)
274 FLAC__ASSERT(0 != iterator);
276 iterator->is_writable = false;
278 if(0 == (iterator->file = fopen(iterator->filename, "r+b"))) {
279 if(errno == EACCES) {
280 if(0 == (iterator->file = fopen(iterator->filename, "rb"))) {
281 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
286 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
291 iterator->is_writable = true;
294 ret = seek_to_first_metadata_block_(iterator->file);
298 iterator->first_offset = iterator->offset[iterator->depth] = ftell(iterator->file);
299 return read_metadata_block_header_(iterator);
301 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
304 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE;
313 @@@ If we decide to finish implementing this, put this comment back in metadata.h
315 * The 'tempfile_path_prefix' allows you to specify a directory where
316 * tempfiles should go. Remember that if your metadata edits cause the
317 * FLAC file to grow, the entire file will have to be rewritten. If
318 * 'tempfile_path_prefix' is NULL, the temp file will be written in the
319 * same directory as the original FLAC file. This makes replacing the
320 * original with the tempfile fast but requires extra space in the same
321 * partition for the tempfile. If space is a problem, you can pass a
322 * directory name belonging to a different partition in
323 * 'tempfile_path_prefix'. Note that you should use the forward slash
324 * '/' as the directory separator. A trailing slash is not needed; it
325 * will be added automatically.
327 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__MetaData_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats, const char *tempfile_path_prefix);
330 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__MetaData_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats)
332 const char *tempfile_path_prefix = 0; /*@@@ search for comments near 'rename(...)' for what it will take to finish implementing this */
334 FLAC__ASSERT(0 != iterator);
335 FLAC__ASSERT(0 != filename);
337 simple_iterator_free_guts_(iterator);
339 if(preserve_file_stats)
340 iterator->has_stats = get_file_stats_(filename, &iterator->stats);
342 if(0 == (iterator->filename = strdup(filename))) {
343 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
346 if(0 != tempfile_path_prefix && 0 == (iterator->tempfile_path_prefix = strdup(tempfile_path_prefix))) {
347 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
351 return simple_iterator_prime_input_(iterator);
354 FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__MetaData_SimpleIterator *iterator)
356 FLAC__ASSERT(0 != iterator);
357 FLAC__ASSERT(0 != iterator->file);
359 return iterator->is_writable;
362 FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__MetaData_SimpleIterator *iterator)
364 FLAC__ASSERT(0 != iterator);
365 FLAC__ASSERT(0 != iterator->file);
367 if(iterator->is_last)
370 if(0 != fseek(iterator->file, iterator->length, SEEK_CUR)) {
371 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
375 iterator->offset[iterator->depth] = ftell(iterator->file);
377 return read_metadata_block_header_(iterator);
380 FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__MetaData_SimpleIterator *iterator)
384 FLAC__ASSERT(0 != iterator);
385 FLAC__ASSERT(0 != iterator->file);
387 if(iterator->offset[iterator->depth] == iterator->first_offset)
390 if(0 != fseek(iterator->file, iterator->first_offset, SEEK_SET)) {
391 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
394 this_offset = iterator->first_offset;
395 if(!read_metadata_block_header_(iterator))
398 /* we ignore any error from ftell() and catch it in fseek() */
399 while(ftell(iterator->file) + (long)iterator->length < iterator->offset[iterator->depth]) {
400 if(0 != fseek(iterator->file, iterator->length, SEEK_CUR)) {
401 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
404 this_offset = ftell(iterator->file);
405 if(!read_metadata_block_header_(iterator))
409 iterator->offset[iterator->depth] = this_offset;
414 FLAC__MetaDataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__MetaData_SimpleIterator *iterator)
416 FLAC__ASSERT(0 != iterator);
417 FLAC__ASSERT(0 != iterator->file);
419 return iterator->type;
422 FLAC__StreamMetaData *FLAC__metadata_simple_iterator_get_block(FLAC__MetaData_SimpleIterator *iterator)
424 FLAC__StreamMetaData *block = FLAC__metadata_object_new(iterator->type);
426 FLAC__ASSERT(0 != iterator);
427 FLAC__ASSERT(0 != iterator->file);
430 block->is_last = iterator->is_last;
431 block->length = iterator->length;
433 if(!read_metadata_block_data_(iterator, block)) {
434 FLAC__metadata_object_delete(block);
438 /* back up to the beginning of the block data to stay consistent */
439 if(0 != fseek(iterator->file, iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH, SEEK_SET)) {
440 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
441 FLAC__metadata_object_delete(block);
446 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
451 FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__MetaData_SimpleIterator *iterator, FLAC__StreamMetaData *block, FLAC__bool use_padding)
453 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth];)
456 FLAC__ASSERT(0 != iterator);
457 FLAC__ASSERT(0 != iterator->file);
459 if(!iterator->is_writable) {
460 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE;
464 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO || block->type == FLAC__METADATA_TYPE_STREAMINFO) {
465 if(iterator->type != block->type) {
466 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
471 block->is_last = iterator->is_last;
473 if(iterator->length == block->length)
474 return write_metadata_block_stationary_(iterator, block);
475 else if(iterator->length > block->length) {
476 if(use_padding && iterator->length >= FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) {
477 ret = write_metadata_block_stationary_with_padding_(iterator, block, iterator->length - FLAC__STREAM_METADATA_HEADER_LENGTH - block->length, block->is_last);
478 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
479 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
483 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
484 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
485 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
489 else /* iterator->length < block->length */ {
490 unsigned padding_leftover = 0;
491 FLAC__bool padding_is_last = false;
493 /* first see if we can even use padding */
494 if(iterator->is_last) {
498 const unsigned extra_padding_bytes_required = block->length - iterator->length;
499 simple_iterator_push_(iterator);
500 if(!FLAC__metadata_simple_iterator_next(iterator)) {
501 (void)simple_iterator_pop_(iterator);
504 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
508 if(FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length == extra_padding_bytes_required) {
509 padding_leftover = 0;
510 block->is_last = iterator->is_last;
512 else if(iterator->length < extra_padding_bytes_required)
515 padding_leftover = FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length - extra_padding_bytes_required;
516 padding_is_last = iterator->is_last;
517 block->is_last = false;
520 if(!simple_iterator_pop_(iterator))
525 if(padding_leftover == 0) {
526 ret = write_metadata_block_stationary_(iterator, block);
527 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
528 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
532 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
533 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
534 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
535 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
540 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
541 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
542 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
548 FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__MetaData_SimpleIterator *iterator, FLAC__StreamMetaData *block, FLAC__bool use_padding)
550 unsigned padding_leftover = 0;
551 FLAC__bool padding_is_last = false;
553 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length;)
556 FLAC__ASSERT(0 != iterator);
557 FLAC__ASSERT(0 != iterator->file);
559 if(!iterator->is_writable)
562 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) {
563 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
567 block->is_last = iterator->is_last;
570 /* first see if we can even use padding */
571 if(iterator->is_last) {
575 simple_iterator_push_(iterator);
576 if(!FLAC__metadata_simple_iterator_next(iterator)) {
577 (void)simple_iterator_pop_(iterator);
580 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
584 if(iterator->length == block->length) {
585 padding_leftover = 0;
586 block->is_last = iterator->is_last;
588 else if(iterator->length < FLAC__STREAM_METADATA_HEADER_LENGTH + block->length)
591 padding_leftover = iterator->length - block->length;
592 padding_is_last = iterator->is_last;
593 block->is_last = false;
596 if(!simple_iterator_pop_(iterator))
601 /* move to the next block, which is suitable padding */
602 if(!FLAC__metadata_simple_iterator_next(iterator))
604 if(padding_leftover == 0) {
605 ret = write_metadata_block_stationary_(iterator, block);
606 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
607 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
611 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
612 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
613 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
614 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
619 ret = rewrite_whole_file_(iterator, block, /*append=*/true);
620 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
621 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
626 FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__MetaData_SimpleIterator *iterator, FLAC__bool use_padding)
628 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth];)
631 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO) {
632 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
637 FLAC__StreamMetaData *padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
639 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
642 padding->length = iterator->length;
643 if(!FLAC__metadata_simple_iterator_set_block(iterator, padding, false)) {
644 FLAC__metadata_object_delete(padding);
647 FLAC__metadata_object_delete(padding);
648 if(!FLAC__metadata_simple_iterator_prev(iterator))
650 FLAC__ASSERT(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length == debug_target_offset);
651 FLAC__ASSERT(ftell(iterator->file) + (long)iterator->length == debug_target_offset);
655 ret = rewrite_whole_file_(iterator, 0, /*append=*/false);
656 FLAC__ASSERT(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length == debug_target_offset);
657 FLAC__ASSERT(ftell(iterator->file) + (long)iterator->length == debug_target_offset);
664 /****************************************************************************
666 * Level 2 implementation
668 ***************************************************************************/
671 typedef struct FLAC__MetaData_Node {
672 FLAC__StreamMetaData *data;
673 struct FLAC__MetaData_Node *prev, *next;
674 } FLAC__MetaData_Node;
676 struct FLAC__MetaData_Chain {
678 FLAC__MetaData_Node *head;
679 FLAC__MetaData_Node *tail;
681 FLAC__MetaData_ChainStatus status;
682 long first_offset, last_offset; /*@@@ 2G limit */
684 * This is the length of the chain initially read from the FLAC file.
685 * it is used to compare against the current_length to decide whether
686 * or not the whole file has to be rewritten.
688 unsigned initial_length; /*@@@ 4G limit */
689 unsigned current_length; /*@@@ 4G limit */
692 struct FLAC__MetaData_Iterator {
693 FLAC__MetaData_Chain *chain;
694 FLAC__MetaData_Node *current;
697 const char *FLAC__MetaData_ChainStatusString[] = {
698 "FLAC__METADATA_CHAIN_STATUS_OK",
699 "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT",
700 "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE",
701 "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE",
702 "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE",
703 "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA",
704 "FLAC__METADATA_CHAIN_STATUS_READ_ERROR",
705 "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR",
706 "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR",
707 "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR",
708 "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR",
709 "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR",
710 "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR"
714 static FLAC__MetaData_Node *node_new_()
716 FLAC__MetaData_Node *node = (FLAC__MetaData_Node*)malloc(sizeof(FLAC__MetaData_Node));
718 memset(node, 0, sizeof(FLAC__MetaData_Node));
722 static void node_delete_(FLAC__MetaData_Node *node)
724 FLAC__ASSERT(0 != node);
726 FLAC__metadata_object_delete(node->data);
730 static void chain_append_node_(FLAC__MetaData_Chain *chain, FLAC__MetaData_Node *node)
732 FLAC__ASSERT(0 != chain);
733 FLAC__ASSERT(0 != node);
734 FLAC__ASSERT(0 != node->data);
736 node->next = node->prev = 0;
737 node->data->is_last = true;
739 chain->tail->data->is_last = false;
744 FLAC__ASSERT(0 != chain->tail);
745 chain->tail->next = node;
746 node->prev = chain->tail;
750 chain->current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
753 static void chain_remove_node_(FLAC__MetaData_Chain *chain, FLAC__MetaData_Node *node)
755 FLAC__ASSERT(0 != chain);
756 FLAC__ASSERT(0 != node);
758 if(node == chain->head)
759 chain->head = node->next;
761 node->prev->next = node->next;
763 if(node == chain->tail)
764 chain->tail = node->prev;
766 node->next->prev = node->prev;
769 chain->tail->data->is_last = true;
772 chain->current_length -= (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
775 static void chain_delete_node_(FLAC__MetaData_Chain *chain, FLAC__MetaData_Node *node)
777 chain_remove_node_(chain, node);
781 static void iterator_insert_node_(FLAC__MetaData_Iterator *iterator, FLAC__MetaData_Node *node)
783 FLAC__ASSERT(0 != node);
784 FLAC__ASSERT(0 != node->data);
785 FLAC__ASSERT(0 != iterator);
786 FLAC__ASSERT(0 != iterator->current);
787 FLAC__ASSERT(0 != iterator->chain);
788 FLAC__ASSERT(0 != iterator->chain->head);
789 FLAC__ASSERT(0 != iterator->chain->tail);
791 node->data->is_last = false;
793 node->prev = iterator->current->prev;
794 node->next = iterator->current;
797 iterator->chain->head = node;
799 node->prev->next = node;
801 iterator->current->prev = node;
803 iterator->chain->nodes++;
804 iterator->chain->current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
807 static void iterator_insert_node_after_(FLAC__MetaData_Iterator *iterator, FLAC__MetaData_Node *node)
809 FLAC__ASSERT(0 != node);
810 FLAC__ASSERT(0 != node->data);
811 FLAC__ASSERT(0 != iterator);
812 FLAC__ASSERT(0 != iterator->current);
813 FLAC__ASSERT(0 != iterator->chain);
814 FLAC__ASSERT(0 != iterator->chain->head);
815 FLAC__ASSERT(0 != iterator->chain->tail);
817 iterator->current->data->is_last = false;
819 node->prev = iterator->current;
820 node->next = iterator->current->next;
823 iterator->chain->tail = node;
825 node->next->prev = node;
827 node->prev->next = node;
829 iterator->chain->tail->data->is_last = true;
831 iterator->chain->nodes++;
832 iterator->chain->current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
835 /* return true iff node and node->next are both padding */
836 static FLAC__bool chain_merge_adjacent_padding_(FLAC__MetaData_Chain *chain, FLAC__MetaData_Node *node)
838 if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) {
839 const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length;
840 node->data->length += growth;
841 chain->current_length += growth;
843 chain_delete_node_(chain, node->next);
850 FLAC__MetaData_Chain *FLAC__metadata_chain_new()
852 FLAC__MetaData_Chain *chain = malloc(sizeof(FLAC__MetaData_Chain));
856 chain->head = chain->tail = 0;
858 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
859 chain->initial_length = chain->current_length = 0;
865 void FLAC__metadata_chain_delete(FLAC__MetaData_Chain *chain)
867 FLAC__MetaData_Node *node, *next;
869 FLAC__ASSERT(0 != chain);
871 for(node = chain->head; node; ) {
877 if(0 != chain->filename)
878 free(chain->filename);
883 FLAC__MetaData_ChainStatus FLAC__metadata_chain_status(FLAC__MetaData_Chain *chain)
885 FLAC__MetaData_ChainStatus status;
887 FLAC__ASSERT(0 != chain);
889 status = chain->status;
890 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
894 FLAC__bool FLAC__metadata_chain_read(FLAC__MetaData_Chain *chain, const char *filename)
896 FLAC__MetaData_SimpleIterator *iterator;
897 FLAC__MetaData_Node *node;
899 FLAC__ASSERT(0 != chain);
900 FLAC__ASSERT(0 != filename);
902 if(0 == (chain->filename = strdup(filename))) {
903 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
907 if(0 == (iterator = FLAC__metadata_simple_iterator_new())) {
908 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
912 if(!FLAC__metadata_simple_iterator_init(iterator, filename, /*preserve_file_stats=*/false)) {
913 chain->status = get_equivalent_status_(iterator->status);
917 chain->first_offset = iterator->offset[iterator->depth];
922 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
925 node->data = FLAC__metadata_simple_iterator_get_block(iterator);
926 if(0 == node->data) {
928 chain->status = get_equivalent_status_(iterator->status);
931 chain_append_node_(chain, node);
932 } while(FLAC__metadata_simple_iterator_next(iterator));
934 if(!iterator->is_last || iterator->status != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) {
935 chain->status = get_equivalent_status_(iterator->status);
939 chain->last_offset = ftell(iterator->file) + iterator->length;
940 FLAC__metadata_simple_iterator_delete(iterator);
942 chain->initial_length = chain->current_length;
946 FLAC__bool FLAC__metadata_chain_write(FLAC__MetaData_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats)
949 const char *tempfile_path_prefix = 0;
952 if(chain->current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
953 const unsigned delta = chain->initial_length - chain->current_length;
954 chain->tail->data->length += delta;
955 chain->current_length += delta;
956 FLAC__ASSERT(chain->current_length == chain->initial_length);
958 else if(chain->current_length + FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
959 FLAC__StreamMetaData *padding;
960 FLAC__MetaData_Node *node;
961 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) {
962 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
965 padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + chain->current_length);
966 if(0 == (node = node_new_())) {
967 FLAC__metadata_object_delete(padding);
968 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
971 node->data = padding;
972 chain_append_node_(chain, node);
973 FLAC__ASSERT(chain->current_length == chain->initial_length);
975 else if(chain->current_length > chain->initial_length) {
976 const unsigned delta = chain->current_length - chain->initial_length;
977 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
978 if(chain->tail->data->length + FLAC__STREAM_METADATA_HEADER_LENGTH == delta) {
979 chain_delete_node_(chain, chain->tail);
980 FLAC__ASSERT(chain->current_length == chain->initial_length);
982 else if(chain->tail->data->length >= delta) {
983 chain->tail->data->length -= delta;
984 chain->current_length -= delta;
985 FLAC__ASSERT(chain->current_length == chain->initial_length);
991 if(preserve_file_stats)
992 get_file_stats_(chain->filename, &stats);
994 if(chain->current_length == chain->initial_length) {
995 if(!chain_rewrite_chain_(chain))
999 if(!chain_rewrite_file_(chain, tempfile_path_prefix))
1003 if(preserve_file_stats)
1004 set_file_stats_(chain->filename, &stats);
1006 /* recompute lengths and offsets if necessary */
1007 if(chain->initial_length != chain->current_length) {
1008 const FLAC__MetaData_Node *node;
1009 chain->initial_length = chain->current_length;
1010 chain->last_offset = chain->first_offset;
1011 for(node = chain->head; node; node = node->next)
1012 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1018 void FLAC__metadata_chain_merge_padding(FLAC__MetaData_Chain *chain)
1020 FLAC__MetaData_Node *node;
1022 FLAC__ASSERT(0 != chain);
1024 for(node = chain->head; node; ) {
1025 if(!chain_merge_adjacent_padding_(chain, node))
1030 void FLAC__metadata_chain_sort_padding(FLAC__MetaData_Chain *chain)
1032 FLAC__MetaData_Node *node, *save;
1035 FLAC__ASSERT(0 != chain);
1038 * Don't try and be too smart... this simple algo is good enough for
1039 * the small number of nodes that we deal with.
1041 for(i = 0, node = chain->head; i < chain->nodes; i++) {
1042 if(node->data->type == FLAC__METADATA_TYPE_PADDING) {
1044 chain_remove_node_(chain, node);
1045 chain_append_node_(chain, node);
1053 FLAC__metadata_chain_merge_padding(chain);
1057 FLAC__MetaData_Iterator *FLAC__metadata_iterator_new()
1059 FLAC__MetaData_Iterator *iterator = malloc(sizeof(FLAC__MetaData_Iterator));
1062 iterator->current = 0;
1063 iterator->chain = 0;
1069 void FLAC__metadata_iterator_delete(FLAC__MetaData_Iterator *iterator)
1071 FLAC__ASSERT(0 != iterator);
1077 * Initialize the iterator to point to the first metadata block in the
1080 void FLAC__metadata_iterator_init(FLAC__MetaData_Iterator *iterator, FLAC__MetaData_Chain *chain)
1082 FLAC__ASSERT(0 != iterator);
1083 FLAC__ASSERT(0 != chain);
1084 FLAC__ASSERT(0 != chain->head);
1086 iterator->chain = chain;
1087 iterator->current = chain->head;
1090 FLAC__bool FLAC__metadata_iterator_next(FLAC__MetaData_Iterator *iterator)
1092 FLAC__ASSERT(0 != iterator);
1094 if(0 == iterator->current || 0 == iterator->current->next)
1097 iterator->current = iterator->current->next;
1101 FLAC__bool FLAC__metadata_iterator_prev(FLAC__MetaData_Iterator *iterator)
1103 FLAC__ASSERT(0 != iterator);
1105 if(0 == iterator->current || 0 == iterator->current->prev)
1108 iterator->current = iterator->current->prev;
1112 FLAC__MetaDataType FLAC__metadata_iterator_get_block_type(const FLAC__MetaData_Iterator *iterator)
1114 FLAC__ASSERT(0 != iterator);
1115 FLAC__ASSERT(0 != iterator->current);
1116 FLAC__ASSERT(0 != iterator->current->data);
1118 return iterator->current->data->type;
1121 FLAC__StreamMetaData *FLAC__metadata_iterator_get_block(FLAC__MetaData_Iterator *iterator)
1123 FLAC__ASSERT(0 != iterator);
1124 FLAC__ASSERT(0 != iterator->current);
1126 return iterator->current->data;
1129 FLAC__bool FLAC__metadata_iterator_set_block(FLAC__MetaData_Iterator *iterator, FLAC__StreamMetaData *block)
1131 return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block);
1134 FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__MetaData_Iterator *iterator, FLAC__bool replace_with_padding)
1136 FLAC__MetaData_Node *save;
1138 FLAC__ASSERT(0 != iterator);
1139 FLAC__ASSERT(0 != iterator->current);
1141 if(0 == iterator->current->prev) {
1142 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1146 save = iterator->current->prev;
1148 if(replace_with_padding) {
1149 FLAC__metadata_object_delete_data(iterator->current->data);
1150 iterator->current->data->type = FLAC__METADATA_TYPE_PADDING;
1153 chain_delete_node_(iterator->chain, iterator->current);
1156 iterator->current = save;
1160 FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__MetaData_Iterator *iterator, FLAC__StreamMetaData *block)
1162 FLAC__MetaData_Node *node;
1164 FLAC__ASSERT(0 != iterator);
1165 FLAC__ASSERT(0 != iterator->current);
1167 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1170 if(0 == iterator->current->prev) {
1171 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1175 if(0 == (node = node_new_()))
1179 iterator_insert_node_(iterator, node);
1180 iterator->current = node;
1184 FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__MetaData_Iterator *iterator, FLAC__StreamMetaData *block)
1186 FLAC__MetaData_Node *node;
1188 FLAC__ASSERT(0 != iterator);
1189 FLAC__ASSERT(0 != iterator->current);
1191 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1194 if(0 == (node = node_new_()))
1198 iterator_insert_node_after_(iterator, node);
1199 iterator->current = node;
1204 /****************************************************************************
1206 * Local function definitions
1208 ***************************************************************************/
1210 void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1216 for(i = 0; i < bytes; i++) {
1217 *(--b) = (FLAC__byte)(val & 0xff);
1222 void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1226 for(i = 0; i < bytes; i++) {
1227 *(b++) = (FLAC__byte)(val & 0xff);
1232 void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes)
1238 for(i = 0; i < bytes; i++) {
1239 *(--b) = (FLAC__byte)(val & 0xff);
1244 FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes)
1246 FLAC__uint32 ret = 0;
1249 for(i = 0; i < bytes; i++)
1250 ret = (ret << 8) | (FLAC__uint32)(*b++);
1255 FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes)
1257 FLAC__uint32 ret = 0;
1262 for(i = 0; i < bytes; i++)
1263 ret = (ret << 8) | (FLAC__uint32)(*--b);
1268 FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes)
1270 FLAC__uint64 ret = 0;
1273 for(i = 0; i < bytes; i++)
1274 ret = (ret << 8) | (FLAC__uint64)(*b++);
1279 FLAC__bool read_metadata_block_header_(FLAC__MetaData_SimpleIterator *iterator)
1281 FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH];
1283 FLAC__ASSERT(0 != iterator);
1284 FLAC__ASSERT(0 != iterator->file);
1286 if(fread(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, iterator->file) != FLAC__STREAM_METADATA_HEADER_LENGTH) {
1287 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1291 iterator->is_last = raw_header[0] & 0x80? true : false;
1292 iterator->type = (FLAC__MetaDataType)(raw_header[0] & 0x7f);
1293 iterator->length = unpack_uint32_(raw_header + 1, 3);
1295 /* do some checking */
1296 if(iterator->type > FLAC__METADATA_TYPE_VORBIS_COMMENT) {
1297 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA;
1304 FLAC__bool read_metadata_block_data_(FLAC__MetaData_SimpleIterator *iterator, FLAC__StreamMetaData *block)
1306 FLAC__ASSERT(0 != iterator);
1307 FLAC__ASSERT(0 != iterator->file);
1309 switch(block->type) {
1310 case FLAC__METADATA_TYPE_STREAMINFO:
1311 iterator->status = read_metadata_block_data_streaminfo_(iterator->file, &block->data.stream_info);
1313 case FLAC__METADATA_TYPE_PADDING:
1314 iterator->status = read_metadata_block_data_padding_(iterator->file, &block->data.padding, block->length);
1316 case FLAC__METADATA_TYPE_APPLICATION:
1317 iterator->status = read_metadata_block_data_application_(iterator->file, &block->data.application, block->length);
1319 case FLAC__METADATA_TYPE_SEEKTABLE:
1320 iterator->status = read_metadata_block_data_seektable_(iterator->file, &block->data.seek_table, block->length);
1322 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1323 iterator->status = read_metadata_block_data_vorbis_comment_(iterator->file, &block->data.vorbis_comment);
1327 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR;
1330 return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1333 FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_streaminfo_(FILE *file, FLAC__StreamMetaData_StreamInfo *block)
1335 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b;
1337 FLAC__ASSERT(0 != file);
1339 if(fread(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, file) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1340 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1344 /* @@@ we are using hardcoded numbers for simplicity but we should
1345 * probably eventually write a bit-level unpacker and use the
1346 * _STREAMINFO_ constants.
1348 block->min_blocksize = unpack_uint32_(b, 2); b += 2;
1349 block->max_blocksize = unpack_uint32_(b, 2); b += 2;
1350 block->min_framesize = unpack_uint32_(b, 3); b += 3;
1351 block->max_framesize = unpack_uint32_(b, 3); b += 3;
1352 block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4);
1353 block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
1354 block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 1) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1;
1355 block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4);
1356 memcpy(block->md5sum, b+8, 16);
1358 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1362 FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_padding_(FILE *file, FLAC__StreamMetaData_Padding *block, unsigned block_length)
1364 FLAC__ASSERT(0 != file);
1366 (void)block; /* nothing to do; we don't care about reading the padding bytes */
1368 if(0 != fseek(file, block_length, SEEK_CUR))
1369 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1371 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1374 FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_application_(FILE *file, FLAC__StreamMetaData_Application *block, unsigned block_length)
1376 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1378 FLAC__ASSERT(0 != file);
1380 if(fread(block->id, 1, id_bytes, file) != id_bytes)
1381 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1383 block_length -= id_bytes;
1385 if(block_length == 0) {
1389 if(0 == (block->data = malloc(block_length)))
1390 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1392 if(fread(block->data, 1, block_length, file) != block_length)
1393 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1396 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1399 FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_seektable_(FILE *file, FLAC__StreamMetaData_SeekTable *block, unsigned block_length)
1402 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1404 FLAC__ASSERT(0 != file);
1405 FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0);
1407 block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1409 if(block->num_points == 0)
1411 else if(0 == (block->points = malloc(block->num_points * sizeof(FLAC__StreamMetaData_SeekPoint))))
1412 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1414 for(i = 0; i < block->num_points; i++) {
1415 if(fread(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, file) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1416 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1417 /*@@@ some MAGIC NUMBERs here */
1418 block->points[i].sample_number = unpack_uint64_(buffer, 8);
1419 block->points[i].stream_offset = unpack_uint64_(buffer+8, 8);
1420 block->points[i].frame_samples = unpack_uint32_(buffer+16, 2);
1423 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1426 FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_(FILE *file, FLAC__StreamMetaData_VorbisComment_Entry *entry)
1428 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1429 FLAC__byte buffer[FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8];
1431 FLAC__ASSERT(0 != file);
1433 if(fread(buffer, 1, entry_length_len, file) != entry_length_len)
1434 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1435 entry->length = unpack_uint32_little_endian_(buffer, entry_length_len);
1437 if(entry->length == 0) {
1441 if(0 == (entry->entry = malloc(entry->length)))
1442 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1444 if(fread(entry->entry, 1, entry->length, file) != entry->length)
1445 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1448 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1451 FLAC__MetaData_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_(FILE *file, FLAC__StreamMetaData_VorbisComment *block)
1454 FLAC__MetaData_SimpleIteratorStatus status;
1455 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
1456 FLAC__byte buffer[FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8];
1458 FLAC__ASSERT(0 != file);
1460 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_(file, &(block->vendor_string))))
1463 if(fread(buffer, 1, num_comments_len, file) != num_comments_len)
1464 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1465 block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len);
1467 if(block->num_comments == 0) {
1468 block->comments = 0;
1470 else if(0 == (block->comments = malloc(block->num_comments * sizeof(FLAC__StreamMetaData_VorbisComment_Entry))))
1471 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1473 for(i = 0; i < block->num_comments; i++) {
1474 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_(file, block->comments + i)))
1478 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1481 FLAC__bool write_metadata_block_header_(FILE *file, FLAC__MetaData_SimpleIteratorStatus *status, const FLAC__StreamMetaData *block)
1483 FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH];
1485 FLAC__ASSERT(0 != file);
1486 FLAC__ASSERT(0 != status);
1487 FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
1489 buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type;
1490 pack_uint32_(block->length, buffer + 1, 3);
1492 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, file) != FLAC__STREAM_METADATA_HEADER_LENGTH) {
1493 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1500 FLAC__bool write_metadata_block_data_(FILE *file, FLAC__MetaData_SimpleIteratorStatus *status, const FLAC__StreamMetaData *block)
1502 FLAC__ASSERT(0 != file);
1503 FLAC__ASSERT(0 != status);
1505 switch(block->type) {
1506 case FLAC__METADATA_TYPE_STREAMINFO:
1507 *status = write_metadata_block_data_streaminfo_(file, &block->data.stream_info);
1509 case FLAC__METADATA_TYPE_PADDING:
1510 *status = write_metadata_block_data_padding_(file, &block->data.padding, block->length);
1512 case FLAC__METADATA_TYPE_APPLICATION:
1513 *status = write_metadata_block_data_application_(file, &block->data.application, block->length);
1515 case FLAC__METADATA_TYPE_SEEKTABLE:
1516 *status = write_metadata_block_data_seektable_(file, &block->data.seek_table);
1518 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1519 *status = write_metadata_block_data_vorbis_comment_(file, &block->data.vorbis_comment);
1523 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR;
1525 return (*status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1528 FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_streaminfo_(FILE *file, const FLAC__StreamMetaData_StreamInfo *block)
1530 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH];
1531 const unsigned channels1 = block->channels - 1;
1532 const unsigned bps1 = block->bits_per_sample - 1;
1534 FLAC__ASSERT(0 != file);
1536 /* @@@ we are using hardcoded numbers for simplicity but we should
1537 * probably eventually write a bit-level packer and use the
1538 * _STREAMINFO_ constants.
1540 pack_uint32_(block->min_blocksize, buffer, 2);
1541 pack_uint32_(block->max_blocksize, buffer+2, 2);
1542 pack_uint32_(block->min_framesize, buffer+4, 3);
1543 pack_uint32_(block->max_framesize, buffer+7, 3);
1544 buffer[10] = (block->sample_rate >> 12) & 0xff;
1545 buffer[11] = (block->sample_rate >> 4) & 0xff;
1546 buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4);
1547 buffer[13] = ((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f);
1548 pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4);
1549 memcpy(buffer+18, block->md5sum, 16);
1551 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, file) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1552 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1554 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1557 FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_padding_(FILE *file, const FLAC__StreamMetaData_Padding *block, unsigned block_length)
1559 unsigned i, n = block_length;
1560 FLAC__byte buffer[1024];
1562 FLAC__ASSERT(0 != file);
1566 memset(buffer, 0, 1024);
1568 for(i = 0; i < n/1024; i++)
1569 if(fwrite(buffer, 1, 1024, file) != 1024)
1570 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1574 if(fwrite(buffer, 1, n, file) != n)
1575 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1577 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1580 FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_application_(FILE *file, const FLAC__StreamMetaData_Application *block, unsigned block_length)
1582 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1584 FLAC__ASSERT(0 != file);
1586 if(fwrite(block->id, 1, id_bytes, file) != id_bytes)
1587 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1589 block_length -= id_bytes;
1591 if(fwrite(block->data, 1, block_length, file) != block_length)
1592 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1594 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1597 FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_seektable_(FILE *file, const FLAC__StreamMetaData_SeekTable *block)
1600 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1602 FLAC__ASSERT(0 != file);
1604 for(i = 0; i < block->num_points; i++) {
1605 /*@@@ some MAGIC NUMBERs here */
1606 pack_uint64_(block->points[i].sample_number, buffer, 8);
1607 pack_uint64_(block->points[i].stream_offset, buffer+8, 8);
1608 pack_uint32_(block->points[i].frame_samples, buffer+16, 2);
1609 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, file) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1610 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1613 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1616 FLAC__MetaData_SimpleIteratorStatus write_metadata_block_data_vorbis_comment_(FILE *file, const FLAC__StreamMetaData_VorbisComment *block)
1619 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1620 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
1621 FLAC__byte buffer[max(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8];
1623 FLAC__ASSERT(0 != file);
1625 pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len);
1626 if(fwrite(buffer, 1, entry_length_len, file) != entry_length_len)
1627 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1628 if(fwrite(block->vendor_string.entry, 1, block->vendor_string.length, file) != block->vendor_string.length)
1629 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1631 pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len);
1632 if(fwrite(buffer, 1, num_comments_len, file) != num_comments_len)
1633 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1635 for(i = 0; i < block->num_comments; i++) {
1636 pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len);
1637 if(fwrite(buffer, 1, entry_length_len, file) != entry_length_len)
1638 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1639 if(fwrite(block->comments[i].entry, 1, block->comments[i].length, file) != block->comments[i].length)
1640 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1643 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1646 FLAC__bool write_metadata_block_stationary_(FLAC__MetaData_SimpleIterator *iterator, const FLAC__StreamMetaData *block)
1648 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1649 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1653 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
1656 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
1659 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1660 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1664 return read_metadata_block_header_(iterator);
1667 FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__MetaData_SimpleIterator *iterator, FLAC__StreamMetaData *block, unsigned padding_length, FLAC__bool padding_is_last)
1669 FLAC__StreamMetaData *padding;
1671 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1672 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1676 block->is_last = false;
1678 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
1681 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
1684 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)))
1685 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1687 padding->is_last = padding_is_last;
1688 padding->length = padding_length;
1690 if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) {
1691 FLAC__metadata_object_delete(padding);
1695 if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) {
1696 FLAC__metadata_object_delete(padding);
1700 FLAC__metadata_object_delete(padding);
1702 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1703 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1707 return read_metadata_block_header_(iterator);
1710 FLAC__bool rewrite_whole_file_(FLAC__MetaData_SimpleIterator *iterator, FLAC__StreamMetaData *block, FLAC__bool append)
1714 int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */
1715 long fixup_is_last_flag_offset = -1;
1717 FLAC__ASSERT(0 != block || append == false);
1719 if(iterator->is_last) {
1721 fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */
1722 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
1724 else if(0 == block) {
1725 simple_iterator_push_(iterator);
1726 if(!FLAC__metadata_simple_iterator_prev(iterator)) {
1727 (void)simple_iterator_pop_(iterator);
1730 fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */
1731 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
1732 if(!simple_iterator_pop_(iterator))
1737 if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append))
1741 if(!write_metadata_block_header_(tempfile, &iterator->status, block)) {
1742 cleanup_tempfile_(&tempfile, &tempfilename);
1746 if(!write_metadata_block_data_(tempfile, &iterator->status, block)) {
1747 cleanup_tempfile_(&tempfile, &tempfilename);
1752 if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0))
1756 return FLAC__metadata_simple_iterator_next(iterator);
1761 FLAC__bool chain_rewrite_chain_(FLAC__MetaData_Chain *chain)
1764 FLAC__MetaData_Node *node;
1765 FLAC__MetaData_SimpleIteratorStatus status;
1767 FLAC__ASSERT(0 != chain);
1768 FLAC__ASSERT(0 != chain->filename);
1769 FLAC__ASSERT(0 != chain->head);
1771 if(0 == (f = fopen(chain->filename, "r+b"))) {
1772 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1775 if(0 != fseek(f, chain->first_offset, SEEK_SET)) {
1776 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1780 for(node = chain->head; node; node = node->next) {
1781 if(!write_metadata_block_header_(f, &status, node->data)) {
1782 chain->status = get_equivalent_status_(status);
1785 if(!write_metadata_block_data_(f, &status, node->data)) {
1786 chain->status = get_equivalent_status_(status);
1791 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1798 FLAC__bool chain_rewrite_file_(FLAC__MetaData_Chain *chain, const char *tempfile_path_prefix)
1802 FLAC__MetaData_SimpleIteratorStatus status;
1803 const FLAC__MetaData_Node *node;
1805 FLAC__ASSERT(0 != chain);
1806 FLAC__ASSERT(0 != chain->filename);
1807 FLAC__ASSERT(0 != chain->head);
1809 /* copy the file prefix (data up to first metadata block */
1810 if(0 == (f = fopen(chain->filename, "rb"))) {
1811 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1814 if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) {
1815 chain->status = get_equivalent_status_(status);
1816 cleanup_tempfile_(&tempfile, &tempfilename);
1819 if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) {
1820 chain->status = get_equivalent_status_(status);
1821 cleanup_tempfile_(&tempfile, &tempfilename);
1825 /* write the metadata */
1826 for(node = chain->head; node; node = node->next) {
1827 if(!write_metadata_block_header_(tempfile, &status, node->data)) {
1828 chain->status = get_equivalent_status_(status);
1831 if(!write_metadata_block_data_(tempfile, &status, node->data)) {
1832 chain->status = get_equivalent_status_(status);
1836 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1838 /* copy the file postfix (everything after the metadata) */
1839 if(0 != fseek(f, chain->last_offset, SEEK_SET)) {
1840 cleanup_tempfile_(&tempfile, &tempfilename);
1841 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1844 if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) {
1845 cleanup_tempfile_(&tempfile, &tempfilename);
1846 chain->status = get_equivalent_status_(status);
1850 /* move the tempfile on top of the original */
1852 if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status))
1858 void simple_iterator_push_(FLAC__MetaData_SimpleIterator *iterator)
1860 FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH);
1861 iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth];
1865 FLAC__bool simple_iterator_pop_(FLAC__MetaData_SimpleIterator *iterator)
1867 FLAC__ASSERT(iterator->depth > 0);
1869 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1870 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1874 return read_metadata_block_header_(iterator);
1877 unsigned seek_to_first_metadata_block_(FILE *f)
1879 FLAC__byte buffer[4];
1883 FLAC__ASSERT(0 != f);
1884 FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == 4);
1886 /* skip any id3v2 tag */
1888 n = fread(buffer, 1, 4, f);
1893 else if(0 == memcmp(buffer, "ID3", 3)) {
1894 unsigned tag_length = 0;
1896 /* skip to the tag length */
1897 if(fseek(f, 2, SEEK_CUR) < 0)
1900 /* read the length */
1901 for(i = 0; i < 4; i++) {
1902 if(fread(buffer, 1, 1, f) < 1 || buffer[0] & 0x80)
1905 tag_length |= (buffer[0] & 0x7f);
1908 /* skip the rest of the tag */
1909 if(fseek(f, tag_length, SEEK_CUR) < 0)
1912 /* read the stream sync code */
1914 n = fread(buffer, 1, 4, f);
1921 /* check for the fLaC signature */
1922 if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH))
1928 FLAC__bool simple_iterator_copy_file_prefix_(FLAC__MetaData_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append)
1930 const long offset_end = append? iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length : iterator->offset[iterator->depth];
1932 if(0 != fseek(iterator->file, 0, SEEK_SET)) {
1933 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1936 if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) {
1937 cleanup_tempfile_(tempfile, tempfilename);
1940 if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) {
1941 cleanup_tempfile_(tempfile, tempfilename);
1948 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)
1950 long save_offset = iterator->offset[iterator->depth]; /*@@@ 2G limit */
1951 FLAC__ASSERT(0 != *tempfile);
1953 if(0 != fseek(iterator->file, save_offset + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length, SEEK_SET)) {
1954 cleanup_tempfile_(tempfile, tempfilename);
1955 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1958 if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) {
1959 cleanup_tempfile_(tempfile, tempfilename);
1963 if(fixup_is_last_code != 0) {
1965 * if code == 1, it means a block was appended to the end so
1966 * we have to clear the is_last flag of the previous block
1967 * if code == -1, it means the last block was deleted so
1968 * we have to set the is_last flag of the previous block
1970 /*@@@ MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */
1972 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
1973 cleanup_tempfile_(tempfile, tempfilename);
1974 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1977 if(fread(&x, 1, 1, *tempfile) != 1) {
1978 cleanup_tempfile_(tempfile, tempfilename);
1979 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1982 if(fixup_is_last_code > 0) {
1983 FLAC__ASSERT(x & 0x80);
1987 FLAC__ASSERT(!(x & 0x80));
1990 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
1991 cleanup_tempfile_(tempfile, tempfilename);
1992 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1995 if(fwrite(&x, 1, 1, *tempfile) != 1) {
1996 cleanup_tempfile_(tempfile, tempfilename);
1997 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2002 (void)fclose(iterator->file);
2004 if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status))
2007 if(iterator->has_stats)
2008 set_file_stats_(iterator->filename, &iterator->stats);
2010 if(!simple_iterator_prime_input_(iterator))
2013 while(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length < save_offset)
2014 if(!FLAC__metadata_simple_iterator_next(iterator))
2019 /* move the iterator to it's original block faster by faking a push, then doing a pop_ */
2020 FLAC__ASSERT(iterator->depth == 0);
2021 iterator->offset[0] = save_offset;
2023 return simple_iterator_pop_(iterator);
2027 FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, unsigned bytes/*@@@ 4G limit*/, FLAC__MetaData_SimpleIteratorStatus *status)
2029 FLAC__byte buffer[8192];
2033 n = min(sizeof(buffer), bytes);
2034 if(fread(buffer, 1, n, file) != n) {
2035 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2038 if(fwrite(buffer, 1, n, tempfile) != n) {
2039 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2048 FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__MetaData_SimpleIteratorStatus *status)
2050 FLAC__byte buffer[8192];
2053 while(!feof(file)) {
2054 n = fread(buffer, 1, sizeof(buffer), file);
2055 if(n == 0 && !feof(file)) {
2056 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2059 if(n > 0 && fwrite(buffer, 1, n, tempfile) != n) {
2060 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2068 FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__MetaData_SimpleIteratorStatus *status)
2070 static const char *tempfile_suffix = ".metadata_edit";
2071 if(0 == tempfile_path_prefix) {
2072 if(0 == (*tempfilename = malloc(strlen(filename) + strlen(tempfile_suffix) + 1))) {
2073 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2076 strcpy(*tempfilename, filename);
2077 strcat(*tempfilename, tempfile_suffix);
2080 const char *p = strrchr(filename, '/');
2086 if(0 == (*tempfilename = malloc(strlen(tempfile_path_prefix) + 1 + strlen(p) + strlen(tempfile_suffix) + 1))) {
2087 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2090 strcpy(*tempfilename, tempfile_path_prefix);
2091 strcat(*tempfilename, "/");
2092 strcat(*tempfilename, p);
2093 strcat(*tempfilename, tempfile_suffix);
2096 if(0 == (*tempfile = fopen(*tempfilename, "w+b"))) {
2097 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
2104 FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__MetaData_SimpleIteratorStatus *status)
2106 FLAC__ASSERT(0 != filename);
2107 FLAC__ASSERT(0 != tempfile);
2108 FLAC__ASSERT(0 != *tempfile);
2109 FLAC__ASSERT(0 != tempfilename);
2110 FLAC__ASSERT(0 != *tempfilename);
2111 FLAC__ASSERT(0 != status);
2113 (void)fclose(*tempfile);
2115 /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just rename(): */
2116 if(0 != rename(*tempfilename, filename)) {
2117 cleanup_tempfile_(tempfile, tempfilename);
2118 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR;
2122 cleanup_tempfile_(tempfile, tempfilename);
2127 void cleanup_tempfile_(FILE **tempfile, char **tempfilename)
2129 if(0 != *tempfile) {
2130 (void)fclose(*tempfile);
2134 if(0 != *tempfilename) {
2135 (void)unlink(*tempfilename);
2136 free(*tempfilename);
2141 FLAC__bool get_file_stats_(const char *filename, struct stat *stats)
2143 FLAC__ASSERT(0 != filename);
2144 FLAC__ASSERT(0 != stats);
2145 return (0 == stat(filename, stats));
2148 void set_file_stats_(const char *filename, struct stat *stats)
2150 struct utimbuf srctime;
2152 FLAC__ASSERT(0 != filename);
2153 FLAC__ASSERT(0 != stats);
2155 srctime.actime = stats->st_atime;
2156 srctime.modtime = stats->st_mtime;
2157 (void)chmod(filename, stats->st_mode);
2158 (void)utime(filename, &srctime);
2159 #if !defined _MSC_VER && !defined __MINGW32__
2160 (void)chown(filename, stats->st_uid, -1);
2161 (void)chown(filename, -1, stats->st_gid);
2165 FLAC__MetaData_ChainStatus get_equivalent_status_(FLAC__MetaData_SimpleIteratorStatus status)
2168 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK:
2169 return FLAC__METADATA_CHAIN_STATUS_OK;
2170 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT:
2171 return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT;
2172 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE:
2173 return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
2174 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE:
2175 return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
2176 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE:
2177 return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE;
2178 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA:
2179 return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA;
2180 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR:
2181 return FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
2182 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR:
2183 return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
2184 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR:
2185 return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
2186 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR:
2187 return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR;
2188 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR:
2189 return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR;
2190 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR:
2191 return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
2192 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR:
2194 return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;