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.
20 #if !defined _MSC_VER && !defined __MINGW32__
21 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
28 #if defined _MSC_VER || defined __MINGW32__
29 #include <sys/utime.h> /* for utime() */
30 #include <io.h> /* for chmod() */
32 #include <sys/types.h> /* some flavors of BSD (like OS X) require this to get time_t */
33 #include <utime.h> /* for utime() */
34 #include <unistd.h> /* for chown(), unlink() */
36 #include <sys/stat.h> /* for stat(), maybe chmod() */
38 #include "private/metadata.h"
40 #include "FLAC/assert.h"
41 #include "FLAC/file_decoder.h"
46 #define max(a,b) ((a)>(b)?(a):(b))
50 #define min(a,b) ((a)<(b)?(a):(b))
53 /****************************************************************************
55 * Local function declarations
57 ***************************************************************************/
59 static void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
60 static void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
61 static void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes);
62 static FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes);
63 static FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes);
64 static FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes);
66 static FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator);
67 static FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block);
68 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_(FILE *file, FLAC__StreamMetadata_StreamInfo *block);
69 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_(FILE *file, FLAC__StreamMetadata_Padding *block, unsigned block_length);
70 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_(FILE *file, FLAC__StreamMetadata_Application *block, unsigned block_length);
71 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_(FILE *file, FLAC__StreamMetadata_SeekTable *block, unsigned block_length);
72 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_(FILE *file, FLAC__StreamMetadata_VorbisComment_Entry *entry);
73 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_(FILE *file, FLAC__StreamMetadata_VorbisComment *block);
75 static FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
76 static FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
77 static FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_streaminfo_(FILE *file, const FLAC__StreamMetadata_StreamInfo *block);
78 static FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_padding_(FILE *file, const FLAC__StreamMetadata_Padding *block, unsigned block_length);
79 static FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_application_(FILE *file, const FLAC__StreamMetadata_Application *block, unsigned block_length);
80 static FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_seektable_(FILE *file, const FLAC__StreamMetadata_SeekTable *block);
81 static FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_vorbis_comment_(FILE *file, const FLAC__StreamMetadata_VorbisComment *block);
82 static FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block);
83 static FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last);
84 static FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append);
86 static FLAC__bool chain_rewrite_chain_(FLAC__Metadata_Chain *chain);
87 static FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix);
89 static void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator);
90 static FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator);
92 /* return 0 if OK, 1 if read error, 2 if not a FLAC file */
93 static unsigned seek_to_first_metadata_block_(FILE *f);
95 static FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append);
96 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);
98 static FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, unsigned bytes/*@@@ 4G limit*/, FLAC__Metadata_SimpleIteratorStatus *status);
99 static FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status);
101 static FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
102 static FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
103 static void cleanup_tempfile_(FILE **tempfile, char **tempfilename);
105 static FLAC__bool get_file_stats_(const char *filename, struct stat *stats);
106 static void set_file_stats_(const char *filename, struct stat *stats);
108 static FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status);
111 /****************************************************************************
113 * Level 0 implementation
115 ***************************************************************************/
117 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
118 static void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
119 static void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
122 FLAC__bool got_error;
123 FLAC__bool got_streaminfo;
124 FLAC__StreamMetadata *streaminfo;
125 } level0_client_data;
127 FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo)
129 level0_client_data cd;
130 FLAC__FileDecoder *decoder = FLAC__file_decoder_new();
135 cd.got_error = false;
136 cd.got_streaminfo = false;
137 cd.streaminfo = streaminfo;
139 FLAC__file_decoder_set_md5_checking(decoder, false);
140 FLAC__file_decoder_set_filename(decoder, filename);
141 FLAC__file_decoder_set_write_callback(decoder, write_callback_);
142 FLAC__file_decoder_set_metadata_callback(decoder, metadata_callback_);
143 FLAC__file_decoder_set_error_callback(decoder, error_callback_);
144 FLAC__file_decoder_set_client_data(decoder, &cd);
146 if(FLAC__file_decoder_init(decoder) != FLAC__FILE_DECODER_OK || cd.got_error) {
147 FLAC__file_decoder_finish(decoder);
148 FLAC__file_decoder_delete(decoder);
152 if(!FLAC__file_decoder_process_metadata(decoder) || cd.got_error) {
153 FLAC__file_decoder_finish(decoder);
154 FLAC__file_decoder_delete(decoder);
158 FLAC__file_decoder_finish(decoder);
159 FLAC__file_decoder_delete(decoder);
161 return !cd.got_error && cd.got_streaminfo;
164 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
166 (void)decoder, (void)frame, (void)buffer, (void)client_data;
168 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
171 void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
173 level0_client_data *cd = (level0_client_data *)client_data;
176 if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO && 0 != cd->streaminfo) {
177 *(cd->streaminfo) = *metadata;
178 cd->got_streaminfo = true;
182 void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
184 level0_client_data *cd = (level0_client_data *)client_data;
187 if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
188 cd->got_error = true;
192 /****************************************************************************
194 * Level 1 implementation
196 ***************************************************************************/
198 #define SIMPLE_ITERATOR_MAX_PUSH_DEPTH (1+4)
199 /* 1 for initial offset, +4 for our own personal use */
201 struct FLAC__Metadata_SimpleIterator {
203 char *filename, *tempfile_path_prefix;
205 FLAC__bool has_stats;
206 FLAC__bool is_writable;
207 FLAC__Metadata_SimpleIteratorStatus status;
208 /*@@@ 2G limits here because of the offset type: */
209 long offset[SIMPLE_ITERATOR_MAX_PUSH_DEPTH];
210 long first_offset; /* this is the offset to the STREAMINFO block */
212 /* this is the metadata block header of the current block we are pointing to: */
214 FLAC__MetadataType type;
218 const char * const FLAC__Metadata_SimpleIteratorStatusString[] = {
219 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK",
220 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT",
221 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE",
222 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE",
223 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE",
224 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA",
225 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR",
226 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR",
227 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR",
228 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR",
229 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR",
230 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR",
231 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR"
235 FLAC__Metadata_SimpleIterator *FLAC__metadata_simple_iterator_new()
237 FLAC__Metadata_SimpleIterator *iterator = malloc(sizeof(FLAC__Metadata_SimpleIterator));
241 iterator->filename = 0;
242 iterator->tempfile_path_prefix = 0;
243 iterator->has_stats = false;
244 iterator->is_writable = false;
245 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
246 iterator->first_offset = iterator->offset[0] = -1;
253 static void simple_iterator_free_guts_(FLAC__Metadata_SimpleIterator *iterator)
255 FLAC__ASSERT(0 != iterator);
257 if(0 != iterator->file) {
258 fclose(iterator->file);
260 if(iterator->has_stats)
261 set_file_stats_(iterator->filename, &iterator->stats);
263 if(0 != iterator->filename) {
264 free(iterator->filename);
265 iterator->filename = 0;
267 if(0 != iterator->tempfile_path_prefix) {
268 free(iterator->tempfile_path_prefix);
269 iterator->tempfile_path_prefix = 0;
273 void FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator *iterator)
275 FLAC__ASSERT(0 != iterator);
277 simple_iterator_free_guts_(iterator);
281 FLAC__Metadata_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator *iterator)
283 FLAC__Metadata_SimpleIteratorStatus status;
285 FLAC__ASSERT(0 != iterator);
287 status = iterator->status;
288 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
292 static FLAC__bool simple_iterator_prime_input_(FLAC__Metadata_SimpleIterator *iterator)
296 FLAC__ASSERT(0 != iterator);
298 iterator->is_writable = false;
300 if(0 == (iterator->file = fopen(iterator->filename, "r+b"))) {
301 #if !defined _MSC_VER && !defined __MINGW32__
302 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
303 if(errno == EACCES) {
305 if(0 == (iterator->file = fopen(iterator->filename, "rb"))) {
306 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
309 #if !defined _MSC_VER && !defined __MINGW32__
313 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
318 iterator->is_writable = true;
321 ret = seek_to_first_metadata_block_(iterator->file);
325 iterator->first_offset = iterator->offset[iterator->depth] = ftell(iterator->file);
326 return read_metadata_block_header_(iterator);
328 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
331 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE;
340 @@@ If we decide to finish implementing this, put this comment back in metadata.h
342 * The 'tempfile_path_prefix' allows you to specify a directory where
343 * tempfiles should go. Remember that if your metadata edits cause the
344 * FLAC file to grow, the entire file will have to be rewritten. If
345 * 'tempfile_path_prefix' is NULL, the temp file will be written in the
346 * same directory as the original FLAC file. This makes replacing the
347 * original with the tempfile fast but requires extra space in the same
348 * partition for the tempfile. If space is a problem, you can pass a
349 * directory name belonging to a different partition in
350 * 'tempfile_path_prefix'. Note that you should use the forward slash
351 * '/' as the directory separator. A trailing slash is not needed; it
352 * will be added automatically.
354 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats, const char *tempfile_path_prefix);
357 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats)
359 const char *tempfile_path_prefix = 0; /*@@@ search for comments near 'rename(...)' for what it will take to finish implementing this */
361 FLAC__ASSERT(0 != iterator);
362 FLAC__ASSERT(0 != filename);
364 simple_iterator_free_guts_(iterator);
366 if(preserve_file_stats)
367 iterator->has_stats = get_file_stats_(filename, &iterator->stats);
369 if(0 == (iterator->filename = strdup(filename))) {
370 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
373 if(0 != tempfile_path_prefix && 0 == (iterator->tempfile_path_prefix = strdup(tempfile_path_prefix))) {
374 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
378 return simple_iterator_prime_input_(iterator);
381 FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator *iterator)
383 FLAC__ASSERT(0 != iterator);
384 FLAC__ASSERT(0 != iterator->file);
386 return iterator->is_writable;
389 FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator *iterator)
391 FLAC__ASSERT(0 != iterator);
392 FLAC__ASSERT(0 != iterator->file);
394 if(iterator->is_last)
397 if(0 != fseek(iterator->file, iterator->length, SEEK_CUR)) {
398 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
402 iterator->offset[iterator->depth] = ftell(iterator->file);
404 return read_metadata_block_header_(iterator);
407 FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator *iterator)
411 FLAC__ASSERT(0 != iterator);
412 FLAC__ASSERT(0 != iterator->file);
414 if(iterator->offset[iterator->depth] == iterator->first_offset)
417 if(0 != fseek(iterator->file, iterator->first_offset, SEEK_SET)) {
418 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
421 this_offset = iterator->first_offset;
422 if(!read_metadata_block_header_(iterator))
425 /* we ignore any error from ftell() and catch it in fseek() */
426 while(ftell(iterator->file) + (long)iterator->length < iterator->offset[iterator->depth]) {
427 if(0 != fseek(iterator->file, iterator->length, SEEK_CUR)) {
428 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
431 this_offset = ftell(iterator->file);
432 if(!read_metadata_block_header_(iterator))
436 iterator->offset[iterator->depth] = this_offset;
441 FLAC__MetadataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator *iterator)
443 FLAC__ASSERT(0 != iterator);
444 FLAC__ASSERT(0 != iterator->file);
446 return iterator->type;
449 FLAC__StreamMetadata *FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator *iterator)
451 FLAC__StreamMetadata *block = FLAC__metadata_object_new(iterator->type);
453 FLAC__ASSERT(0 != iterator);
454 FLAC__ASSERT(0 != iterator->file);
457 block->is_last = iterator->is_last;
458 block->length = iterator->length;
460 if(!read_metadata_block_data_(iterator, block)) {
461 FLAC__metadata_object_delete(block);
465 /* back up to the beginning of the block data to stay consistent */
466 if(0 != fseek(iterator->file, iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH, SEEK_SET)) {
467 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
468 FLAC__metadata_object_delete(block);
473 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
478 FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
480 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth];)
483 FLAC__ASSERT(0 != iterator);
484 FLAC__ASSERT(0 != iterator->file);
486 if(!iterator->is_writable) {
487 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE;
491 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO || block->type == FLAC__METADATA_TYPE_STREAMINFO) {
492 if(iterator->type != block->type) {
493 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
498 block->is_last = iterator->is_last;
500 if(iterator->length == block->length)
501 return write_metadata_block_stationary_(iterator, block);
502 else if(iterator->length > block->length) {
503 if(use_padding && iterator->length >= FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) {
504 ret = write_metadata_block_stationary_with_padding_(iterator, block, iterator->length - FLAC__STREAM_METADATA_HEADER_LENGTH - block->length, block->is_last);
505 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
506 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
510 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
511 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
512 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
516 else /* iterator->length < block->length */ {
517 unsigned padding_leftover = 0;
518 FLAC__bool padding_is_last = false;
520 /* first see if we can even use padding */
521 if(iterator->is_last) {
525 const unsigned extra_padding_bytes_required = block->length - iterator->length;
526 simple_iterator_push_(iterator);
527 if(!FLAC__metadata_simple_iterator_next(iterator)) {
528 (void)simple_iterator_pop_(iterator);
531 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
535 if(FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length == extra_padding_bytes_required) {
536 padding_leftover = 0;
537 block->is_last = iterator->is_last;
539 else if(iterator->length < extra_padding_bytes_required)
542 padding_leftover = FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length - extra_padding_bytes_required;
543 padding_is_last = iterator->is_last;
544 block->is_last = false;
547 if(!simple_iterator_pop_(iterator))
552 if(padding_leftover == 0) {
553 ret = write_metadata_block_stationary_(iterator, block);
554 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
555 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
559 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
560 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
561 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
562 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
567 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
568 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
569 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
575 FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
577 unsigned padding_leftover = 0;
578 FLAC__bool padding_is_last = false;
580 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length;)
583 FLAC__ASSERT(0 != iterator);
584 FLAC__ASSERT(0 != iterator->file);
586 if(!iterator->is_writable)
589 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) {
590 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
594 block->is_last = iterator->is_last;
597 /* first see if we can even use padding */
598 if(iterator->is_last) {
602 simple_iterator_push_(iterator);
603 if(!FLAC__metadata_simple_iterator_next(iterator)) {
604 (void)simple_iterator_pop_(iterator);
607 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
611 if(iterator->length == block->length) {
612 padding_leftover = 0;
613 block->is_last = iterator->is_last;
615 else if(iterator->length < FLAC__STREAM_METADATA_HEADER_LENGTH + block->length)
618 padding_leftover = iterator->length - block->length;
619 padding_is_last = iterator->is_last;
620 block->is_last = false;
623 if(!simple_iterator_pop_(iterator))
628 /* move to the next block, which is suitable padding */
629 if(!FLAC__metadata_simple_iterator_next(iterator))
631 if(padding_leftover == 0) {
632 ret = write_metadata_block_stationary_(iterator, block);
633 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
634 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
638 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
639 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
640 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
641 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
646 ret = rewrite_whole_file_(iterator, block, /*append=*/true);
647 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
648 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
653 FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool use_padding)
655 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth];)
658 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO) {
659 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
664 FLAC__StreamMetadata *padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
666 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
669 padding->length = iterator->length;
670 if(!FLAC__metadata_simple_iterator_set_block(iterator, padding, false)) {
671 FLAC__metadata_object_delete(padding);
674 FLAC__metadata_object_delete(padding);
675 if(!FLAC__metadata_simple_iterator_prev(iterator))
677 FLAC__ASSERT(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length == debug_target_offset);
678 FLAC__ASSERT(ftell(iterator->file) + (long)iterator->length == debug_target_offset);
682 ret = rewrite_whole_file_(iterator, 0, /*append=*/false);
683 FLAC__ASSERT(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length == debug_target_offset);
684 FLAC__ASSERT(ftell(iterator->file) + (long)iterator->length == debug_target_offset);
691 /****************************************************************************
693 * Level 2 implementation
695 ***************************************************************************/
698 typedef struct FLAC__Metadata_Node {
699 FLAC__StreamMetadata *data;
700 struct FLAC__Metadata_Node *prev, *next;
701 } FLAC__Metadata_Node;
703 struct FLAC__Metadata_Chain {
705 FLAC__Metadata_Node *head;
706 FLAC__Metadata_Node *tail;
708 FLAC__Metadata_ChainStatus status;
709 long first_offset, last_offset; /*@@@ 2G limit */
711 * This is the length of the chain initially read from the FLAC file.
712 * it is used to compare against the current length to decide whether
713 * or not the whole file has to be rewritten.
715 unsigned initial_length; /*@@@ 4G limit */
718 struct FLAC__Metadata_Iterator {
719 FLAC__Metadata_Chain *chain;
720 FLAC__Metadata_Node *current;
723 const char * const FLAC__Metadata_ChainStatusString[] = {
724 "FLAC__METADATA_CHAIN_STATUS_OK",
725 "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT",
726 "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE",
727 "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE",
728 "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE",
729 "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA",
730 "FLAC__METADATA_CHAIN_STATUS_READ_ERROR",
731 "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR",
732 "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR",
733 "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR",
734 "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR",
735 "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR",
736 "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR"
740 static FLAC__Metadata_Node *node_new_()
742 FLAC__Metadata_Node *node = (FLAC__Metadata_Node*)malloc(sizeof(FLAC__Metadata_Node));
744 memset(node, 0, sizeof(FLAC__Metadata_Node));
748 static void node_delete_(FLAC__Metadata_Node *node)
750 FLAC__ASSERT(0 != node);
752 FLAC__metadata_object_delete(node->data);
756 static void chain_append_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
758 FLAC__ASSERT(0 != chain);
759 FLAC__ASSERT(0 != node);
760 FLAC__ASSERT(0 != node->data);
762 node->next = node->prev = 0;
763 node->data->is_last = true;
765 chain->tail->data->is_last = false;
770 FLAC__ASSERT(0 != chain->tail);
771 chain->tail->next = node;
772 node->prev = chain->tail;
778 static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
780 FLAC__ASSERT(0 != chain);
781 FLAC__ASSERT(0 != node);
783 if(node == chain->head)
784 chain->head = node->next;
786 node->prev->next = node->next;
788 if(node == chain->tail)
789 chain->tail = node->prev;
791 node->next->prev = node->prev;
794 chain->tail->data->is_last = true;
799 static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
801 chain_remove_node_(chain, node);
805 static unsigned chain_calculate_length_(FLAC__Metadata_Chain *chain)
807 const FLAC__Metadata_Node *node;
809 for(node = chain->head; node; node = node->next)
810 length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
814 static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
816 FLAC__ASSERT(0 != node);
817 FLAC__ASSERT(0 != node->data);
818 FLAC__ASSERT(0 != iterator);
819 FLAC__ASSERT(0 != iterator->current);
820 FLAC__ASSERT(0 != iterator->chain);
821 FLAC__ASSERT(0 != iterator->chain->head);
822 FLAC__ASSERT(0 != iterator->chain->tail);
824 node->data->is_last = false;
826 node->prev = iterator->current->prev;
827 node->next = iterator->current;
830 iterator->chain->head = node;
832 node->prev->next = node;
834 iterator->current->prev = node;
836 iterator->chain->nodes++;
839 static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
841 FLAC__ASSERT(0 != node);
842 FLAC__ASSERT(0 != node->data);
843 FLAC__ASSERT(0 != iterator);
844 FLAC__ASSERT(0 != iterator->current);
845 FLAC__ASSERT(0 != iterator->chain);
846 FLAC__ASSERT(0 != iterator->chain->head);
847 FLAC__ASSERT(0 != iterator->chain->tail);
849 iterator->current->data->is_last = false;
851 node->prev = iterator->current;
852 node->next = iterator->current->next;
855 iterator->chain->tail = node;
857 node->next->prev = node;
859 node->prev->next = node;
861 iterator->chain->tail->data->is_last = true;
863 iterator->chain->nodes++;
866 /* return true iff node and node->next are both padding */
867 static FLAC__bool chain_merge_adjacent_padding_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
869 if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) {
870 const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length;
871 node->data->length += growth;
873 chain_delete_node_(chain, node->next);
880 FLAC__Metadata_Chain *FLAC__metadata_chain_new()
882 FLAC__Metadata_Chain *chain = malloc(sizeof(FLAC__Metadata_Chain));
886 chain->head = chain->tail = 0;
888 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
889 chain->initial_length = 0;
895 void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain)
897 FLAC__Metadata_Node *node, *next;
899 FLAC__ASSERT(0 != chain);
901 for(node = chain->head; node; ) {
907 if(0 != chain->filename)
908 free(chain->filename);
913 FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain)
915 FLAC__Metadata_ChainStatus status;
917 FLAC__ASSERT(0 != chain);
919 status = chain->status;
920 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
924 FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename)
926 FLAC__Metadata_SimpleIterator *iterator;
927 FLAC__Metadata_Node *node;
929 FLAC__ASSERT(0 != chain);
930 FLAC__ASSERT(0 != filename);
932 if(0 == (chain->filename = strdup(filename))) {
933 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
937 if(0 == (iterator = FLAC__metadata_simple_iterator_new())) {
938 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
942 if(!FLAC__metadata_simple_iterator_init(iterator, filename, /*preserve_file_stats=*/false)) {
943 chain->status = get_equivalent_status_(iterator->status);
947 chain->first_offset = iterator->offset[iterator->depth];
952 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
955 node->data = FLAC__metadata_simple_iterator_get_block(iterator);
956 if(0 == node->data) {
958 chain->status = get_equivalent_status_(iterator->status);
961 chain_append_node_(chain, node);
962 } while(FLAC__metadata_simple_iterator_next(iterator));
964 if(!iterator->is_last || iterator->status != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) {
965 chain->status = get_equivalent_status_(iterator->status);
969 chain->last_offset = ftell(iterator->file) + iterator->length;
970 FLAC__metadata_simple_iterator_delete(iterator);
972 chain->initial_length = chain_calculate_length_(chain);
976 FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats)
979 const char *tempfile_path_prefix = 0;
980 unsigned current_length;
982 FLAC__ASSERT(0 != chain);
984 current_length = chain_calculate_length_(chain);
987 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
988 const unsigned delta = chain->initial_length - current_length;
989 chain->tail->data->length += delta;
990 current_length += delta;
991 FLAC__ASSERT(current_length == chain->initial_length);
993 else if(current_length + FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
994 FLAC__StreamMetadata *padding;
995 FLAC__Metadata_Node *node;
996 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) {
997 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1000 padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + current_length);
1001 if(0 == (node = node_new_())) {
1002 FLAC__metadata_object_delete(padding);
1003 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1006 node->data = padding;
1007 chain_append_node_(chain, node);
1008 current_length = chain_calculate_length_(chain);
1009 FLAC__ASSERT(current_length == chain->initial_length);
1011 else if(current_length > chain->initial_length) {
1012 const unsigned delta = current_length - chain->initial_length;
1013 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1014 if(chain->tail->data->length + FLAC__STREAM_METADATA_HEADER_LENGTH == delta) {
1015 chain_delete_node_(chain, chain->tail);
1016 current_length = chain_calculate_length_(chain);
1017 FLAC__ASSERT(current_length == chain->initial_length);
1019 else if(chain->tail->data->length >= delta) {
1020 chain->tail->data->length -= delta;
1021 current_length -= delta;
1022 FLAC__ASSERT(current_length == chain->initial_length);
1028 if(preserve_file_stats)
1029 get_file_stats_(chain->filename, &stats);
1031 if(current_length == chain->initial_length) {
1032 if(!chain_rewrite_chain_(chain))
1036 if(!chain_rewrite_file_(chain, tempfile_path_prefix))
1040 if(preserve_file_stats)
1041 set_file_stats_(chain->filename, &stats);
1043 /* recompute lengths and offsets if necessary */
1044 if(chain->initial_length != current_length) {
1045 const FLAC__Metadata_Node *node;
1046 chain->initial_length = current_length;
1047 chain->last_offset = chain->first_offset;
1048 for(node = chain->head; node; node = node->next)
1049 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1055 void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain)
1057 FLAC__Metadata_Node *node;
1059 FLAC__ASSERT(0 != chain);
1061 for(node = chain->head; node; ) {
1062 if(!chain_merge_adjacent_padding_(chain, node))
1067 void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain)
1069 FLAC__Metadata_Node *node, *save;
1072 FLAC__ASSERT(0 != chain);
1075 * Don't try and be too smart... this simple algo is good enough for
1076 * the small number of nodes that we deal with.
1078 for(i = 0, node = chain->head; i < chain->nodes; i++) {
1079 if(node->data->type == FLAC__METADATA_TYPE_PADDING) {
1081 chain_remove_node_(chain, node);
1082 chain_append_node_(chain, node);
1090 FLAC__metadata_chain_merge_padding(chain);
1094 FLAC__Metadata_Iterator *FLAC__metadata_iterator_new()
1096 FLAC__Metadata_Iterator *iterator = malloc(sizeof(FLAC__Metadata_Iterator));
1099 iterator->current = 0;
1100 iterator->chain = 0;
1106 void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator)
1108 FLAC__ASSERT(0 != iterator);
1114 * Initialize the iterator to point to the first metadata block in the
1117 void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain)
1119 FLAC__ASSERT(0 != iterator);
1120 FLAC__ASSERT(0 != chain);
1121 FLAC__ASSERT(0 != chain->head);
1123 iterator->chain = chain;
1124 iterator->current = chain->head;
1127 FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator)
1129 FLAC__ASSERT(0 != iterator);
1131 if(0 == iterator->current || 0 == iterator->current->next)
1134 iterator->current = iterator->current->next;
1138 FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator)
1140 FLAC__ASSERT(0 != iterator);
1142 if(0 == iterator->current || 0 == iterator->current->prev)
1145 iterator->current = iterator->current->prev;
1149 FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator)
1151 FLAC__ASSERT(0 != iterator);
1152 FLAC__ASSERT(0 != iterator->current);
1153 FLAC__ASSERT(0 != iterator->current->data);
1155 return iterator->current->data->type;
1158 FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator)
1160 FLAC__ASSERT(0 != iterator);
1161 FLAC__ASSERT(0 != iterator->current);
1163 return iterator->current->data;
1166 FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1168 return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block);
1171 FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding)
1173 FLAC__Metadata_Node *save;
1175 FLAC__ASSERT(0 != iterator);
1176 FLAC__ASSERT(0 != iterator->current);
1178 if(0 == iterator->current->prev) {
1179 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1183 save = iterator->current->prev;
1185 if(replace_with_padding) {
1186 FLAC__metadata_object_delete_data(iterator->current->data);
1187 iterator->current->data->type = FLAC__METADATA_TYPE_PADDING;
1190 chain_delete_node_(iterator->chain, iterator->current);
1193 iterator->current = save;
1197 FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1199 FLAC__Metadata_Node *node;
1201 FLAC__ASSERT(0 != iterator);
1202 FLAC__ASSERT(0 != iterator->current);
1204 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1207 if(0 == iterator->current->prev) {
1208 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1212 if(0 == (node = node_new_()))
1216 iterator_insert_node_(iterator, node);
1217 iterator->current = node;
1221 FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1223 FLAC__Metadata_Node *node;
1225 FLAC__ASSERT(0 != iterator);
1226 FLAC__ASSERT(0 != iterator->current);
1228 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1231 if(0 == (node = node_new_()))
1235 iterator_insert_node_after_(iterator, node);
1236 iterator->current = node;
1241 /****************************************************************************
1243 * Local function definitions
1245 ***************************************************************************/
1247 void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1253 for(i = 0; i < bytes; i++) {
1254 *(--b) = (FLAC__byte)(val & 0xff);
1259 void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1263 for(i = 0; i < bytes; i++) {
1264 *(b++) = (FLAC__byte)(val & 0xff);
1269 void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes)
1275 for(i = 0; i < bytes; i++) {
1276 *(--b) = (FLAC__byte)(val & 0xff);
1281 FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes)
1283 FLAC__uint32 ret = 0;
1286 for(i = 0; i < bytes; i++)
1287 ret = (ret << 8) | (FLAC__uint32)(*b++);
1292 FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes)
1294 FLAC__uint32 ret = 0;
1299 for(i = 0; i < bytes; i++)
1300 ret = (ret << 8) | (FLAC__uint32)(*--b);
1305 FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes)
1307 FLAC__uint64 ret = 0;
1310 for(i = 0; i < bytes; i++)
1311 ret = (ret << 8) | (FLAC__uint64)(*b++);
1316 FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator)
1318 FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH];
1320 FLAC__ASSERT(0 != iterator);
1321 FLAC__ASSERT(0 != iterator->file);
1323 if(fread(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, iterator->file) != FLAC__STREAM_METADATA_HEADER_LENGTH) {
1324 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1328 iterator->is_last = raw_header[0] & 0x80? true : false;
1329 iterator->type = (FLAC__MetadataType)(raw_header[0] & 0x7f);
1330 iterator->length = unpack_uint32_(raw_header + 1, 3);
1332 /* do some checking */
1333 if(iterator->type > FLAC__METADATA_TYPE_VORBIS_COMMENT) {
1334 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA;
1341 FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block)
1343 FLAC__ASSERT(0 != iterator);
1344 FLAC__ASSERT(0 != iterator->file);
1346 switch(block->type) {
1347 case FLAC__METADATA_TYPE_STREAMINFO:
1348 iterator->status = read_metadata_block_data_streaminfo_(iterator->file, &block->data.stream_info);
1350 case FLAC__METADATA_TYPE_PADDING:
1351 iterator->status = read_metadata_block_data_padding_(iterator->file, &block->data.padding, block->length);
1353 case FLAC__METADATA_TYPE_APPLICATION:
1354 iterator->status = read_metadata_block_data_application_(iterator->file, &block->data.application, block->length);
1356 case FLAC__METADATA_TYPE_SEEKTABLE:
1357 iterator->status = read_metadata_block_data_seektable_(iterator->file, &block->data.seek_table, block->length);
1359 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1360 iterator->status = read_metadata_block_data_vorbis_comment_(iterator->file, &block->data.vorbis_comment);
1364 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR;
1367 return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1370 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_(FILE *file, FLAC__StreamMetadata_StreamInfo *block)
1372 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b;
1374 FLAC__ASSERT(0 != file);
1376 if(fread(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, file) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1377 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1381 /* @@@ we are using hardcoded numbers for simplicity but we should
1382 * probably eventually write a bit-level unpacker and use the
1383 * _STREAMINFO_ constants.
1385 block->min_blocksize = unpack_uint32_(b, 2); b += 2;
1386 block->max_blocksize = unpack_uint32_(b, 2); b += 2;
1387 block->min_framesize = unpack_uint32_(b, 3); b += 3;
1388 block->max_framesize = unpack_uint32_(b, 3); b += 3;
1389 block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4);
1390 block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
1391 block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 1) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1;
1392 block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4);
1393 memcpy(block->md5sum, b+8, 16);
1395 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1399 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_(FILE *file, FLAC__StreamMetadata_Padding *block, unsigned block_length)
1401 FLAC__ASSERT(0 != file);
1403 (void)block; /* nothing to do; we don't care about reading the padding bytes */
1405 if(0 != fseek(file, block_length, SEEK_CUR))
1406 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1408 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1411 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_(FILE *file, FLAC__StreamMetadata_Application *block, unsigned block_length)
1413 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1415 FLAC__ASSERT(0 != file);
1417 if(fread(block->id, 1, id_bytes, file) != id_bytes)
1418 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1420 block_length -= id_bytes;
1422 if(block_length == 0) {
1426 if(0 == (block->data = malloc(block_length)))
1427 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1429 if(fread(block->data, 1, block_length, file) != block_length)
1430 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1433 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1436 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_(FILE *file, FLAC__StreamMetadata_SeekTable *block, unsigned block_length)
1439 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1441 FLAC__ASSERT(0 != file);
1442 FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0);
1444 block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1446 if(block->num_points == 0)
1448 else if(0 == (block->points = malloc(block->num_points * sizeof(FLAC__StreamMetadata_SeekPoint))))
1449 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1451 for(i = 0; i < block->num_points; i++) {
1452 if(fread(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, file) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1453 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1454 /*@@@ some MAGIC NUMBERs here */
1455 block->points[i].sample_number = unpack_uint64_(buffer, 8);
1456 block->points[i].stream_offset = unpack_uint64_(buffer+8, 8);
1457 block->points[i].frame_samples = unpack_uint32_(buffer+16, 2);
1460 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1463 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_(FILE *file, FLAC__StreamMetadata_VorbisComment_Entry *entry)
1465 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1466 FLAC__byte buffer[4]; /* magic number is asserted below */
1468 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8 == 4);
1469 FLAC__ASSERT(0 != file);
1471 if(fread(buffer, 1, entry_length_len, file) != entry_length_len)
1472 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1473 entry->length = unpack_uint32_little_endian_(buffer, entry_length_len);
1475 if(entry->length == 0) {
1479 if(0 == (entry->entry = malloc(entry->length)))
1480 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1482 if(fread(entry->entry, 1, entry->length, file) != entry->length)
1483 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1486 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1489 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_(FILE *file, FLAC__StreamMetadata_VorbisComment *block)
1492 FLAC__Metadata_SimpleIteratorStatus status;
1493 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
1494 FLAC__byte buffer[4]; /* magic number is asserted below */
1496 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8 == 4);
1497 FLAC__ASSERT(0 != file);
1499 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_(file, &(block->vendor_string))))
1502 if(fread(buffer, 1, num_comments_len, file) != num_comments_len)
1503 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1504 block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len);
1506 if(block->num_comments == 0) {
1507 block->comments = 0;
1509 else if(0 == (block->comments = malloc(block->num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry))))
1510 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1512 for(i = 0; i < block->num_comments; i++) {
1513 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_(file, block->comments + i)))
1517 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1520 FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
1522 FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH];
1524 FLAC__ASSERT(0 != file);
1525 FLAC__ASSERT(0 != status);
1526 FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
1528 buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type;
1529 pack_uint32_(block->length, buffer + 1, 3);
1531 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, file) != FLAC__STREAM_METADATA_HEADER_LENGTH) {
1532 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1539 FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
1541 FLAC__ASSERT(0 != file);
1542 FLAC__ASSERT(0 != status);
1544 switch(block->type) {
1545 case FLAC__METADATA_TYPE_STREAMINFO:
1546 *status = write_metadata_block_data_streaminfo_(file, &block->data.stream_info);
1548 case FLAC__METADATA_TYPE_PADDING:
1549 *status = write_metadata_block_data_padding_(file, &block->data.padding, block->length);
1551 case FLAC__METADATA_TYPE_APPLICATION:
1552 *status = write_metadata_block_data_application_(file, &block->data.application, block->length);
1554 case FLAC__METADATA_TYPE_SEEKTABLE:
1555 *status = write_metadata_block_data_seektable_(file, &block->data.seek_table);
1557 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1558 *status = write_metadata_block_data_vorbis_comment_(file, &block->data.vorbis_comment);
1562 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR;
1564 return (*status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1567 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_streaminfo_(FILE *file, const FLAC__StreamMetadata_StreamInfo *block)
1569 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH];
1570 const unsigned channels1 = block->channels - 1;
1571 const unsigned bps1 = block->bits_per_sample - 1;
1573 FLAC__ASSERT(0 != file);
1575 /* @@@ we are using hardcoded numbers for simplicity but we should
1576 * probably eventually write a bit-level packer and use the
1577 * _STREAMINFO_ constants.
1579 pack_uint32_(block->min_blocksize, buffer, 2);
1580 pack_uint32_(block->max_blocksize, buffer+2, 2);
1581 pack_uint32_(block->min_framesize, buffer+4, 3);
1582 pack_uint32_(block->max_framesize, buffer+7, 3);
1583 buffer[10] = (block->sample_rate >> 12) & 0xff;
1584 buffer[11] = (block->sample_rate >> 4) & 0xff;
1585 buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4);
1586 buffer[13] = (FLAC__byte)(((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f));
1587 pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4);
1588 memcpy(buffer+18, block->md5sum, 16);
1590 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, file) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1591 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1593 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1596 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_padding_(FILE *file, const FLAC__StreamMetadata_Padding *block, unsigned block_length)
1598 unsigned i, n = block_length;
1599 FLAC__byte buffer[1024];
1601 FLAC__ASSERT(0 != file);
1605 memset(buffer, 0, 1024);
1607 for(i = 0; i < n/1024; i++)
1608 if(fwrite(buffer, 1, 1024, file) != 1024)
1609 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1613 if(fwrite(buffer, 1, n, file) != n)
1614 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1616 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1619 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_application_(FILE *file, const FLAC__StreamMetadata_Application *block, unsigned block_length)
1621 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1623 FLAC__ASSERT(0 != file);
1625 if(fwrite(block->id, 1, id_bytes, file) != id_bytes)
1626 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1628 block_length -= id_bytes;
1630 if(fwrite(block->data, 1, block_length, file) != block_length)
1631 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1633 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1636 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_seektable_(FILE *file, const FLAC__StreamMetadata_SeekTable *block)
1639 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1641 FLAC__ASSERT(0 != file);
1643 for(i = 0; i < block->num_points; i++) {
1644 /*@@@ some MAGIC NUMBERs here */
1645 pack_uint64_(block->points[i].sample_number, buffer, 8);
1646 pack_uint64_(block->points[i].stream_offset, buffer+8, 8);
1647 pack_uint32_(block->points[i].frame_samples, buffer+16, 2);
1648 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, file) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1649 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1652 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1655 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_vorbis_comment_(FILE *file, const FLAC__StreamMetadata_VorbisComment *block)
1658 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1659 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
1660 FLAC__byte buffer[4]; /* magic number is asserted below */
1662 FLAC__ASSERT(max(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8 == 4);
1663 FLAC__ASSERT(0 != file);
1665 pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len);
1666 if(fwrite(buffer, 1, entry_length_len, file) != entry_length_len)
1667 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1668 if(fwrite(block->vendor_string.entry, 1, block->vendor_string.length, file) != block->vendor_string.length)
1669 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1671 pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len);
1672 if(fwrite(buffer, 1, num_comments_len, file) != num_comments_len)
1673 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1675 for(i = 0; i < block->num_comments; i++) {
1676 pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len);
1677 if(fwrite(buffer, 1, entry_length_len, file) != entry_length_len)
1678 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1679 if(fwrite(block->comments[i].entry, 1, block->comments[i].length, file) != block->comments[i].length)
1680 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1683 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1686 FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block)
1688 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1689 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1693 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
1696 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
1699 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1700 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1704 return read_metadata_block_header_(iterator);
1707 FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last)
1709 FLAC__StreamMetadata *padding;
1711 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1712 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1716 block->is_last = false;
1718 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
1721 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
1724 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)))
1725 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1727 padding->is_last = padding_is_last;
1728 padding->length = padding_length;
1730 if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) {
1731 FLAC__metadata_object_delete(padding);
1735 if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) {
1736 FLAC__metadata_object_delete(padding);
1740 FLAC__metadata_object_delete(padding);
1742 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1743 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1747 return read_metadata_block_header_(iterator);
1750 FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append)
1754 int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */
1755 long fixup_is_last_flag_offset = -1;
1757 FLAC__ASSERT(0 != block || append == false);
1759 if(iterator->is_last) {
1761 fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */
1762 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
1764 else if(0 == block) {
1765 simple_iterator_push_(iterator);
1766 if(!FLAC__metadata_simple_iterator_prev(iterator)) {
1767 (void)simple_iterator_pop_(iterator);
1770 fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */
1771 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
1772 if(!simple_iterator_pop_(iterator))
1777 if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append))
1781 if(!write_metadata_block_header_(tempfile, &iterator->status, block)) {
1782 cleanup_tempfile_(&tempfile, &tempfilename);
1786 if(!write_metadata_block_data_(tempfile, &iterator->status, block)) {
1787 cleanup_tempfile_(&tempfile, &tempfilename);
1792 if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0))
1796 return FLAC__metadata_simple_iterator_next(iterator);
1801 FLAC__bool chain_rewrite_chain_(FLAC__Metadata_Chain *chain)
1804 FLAC__Metadata_Node *node;
1805 FLAC__Metadata_SimpleIteratorStatus status;
1807 FLAC__ASSERT(0 != chain);
1808 FLAC__ASSERT(0 != chain->filename);
1809 FLAC__ASSERT(0 != chain->head);
1811 if(0 == (f = fopen(chain->filename, "r+b"))) {
1812 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1815 if(0 != fseek(f, chain->first_offset, SEEK_SET)) {
1816 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1820 for(node = chain->head; node; node = node->next) {
1821 if(!write_metadata_block_header_(f, &status, node->data)) {
1822 chain->status = get_equivalent_status_(status);
1825 if(!write_metadata_block_data_(f, &status, node->data)) {
1826 chain->status = get_equivalent_status_(status);
1831 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1838 FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix)
1842 FLAC__Metadata_SimpleIteratorStatus status;
1843 const FLAC__Metadata_Node *node;
1845 FLAC__ASSERT(0 != chain);
1846 FLAC__ASSERT(0 != chain->filename);
1847 FLAC__ASSERT(0 != chain->head);
1849 /* copy the file prefix (data up to first metadata block */
1850 if(0 == (f = fopen(chain->filename, "rb"))) {
1851 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1854 if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) {
1855 chain->status = get_equivalent_status_(status);
1856 cleanup_tempfile_(&tempfile, &tempfilename);
1859 if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) {
1860 chain->status = get_equivalent_status_(status);
1861 cleanup_tempfile_(&tempfile, &tempfilename);
1865 /* write the metadata */
1866 for(node = chain->head; node; node = node->next) {
1867 if(!write_metadata_block_header_(tempfile, &status, node->data)) {
1868 chain->status = get_equivalent_status_(status);
1871 if(!write_metadata_block_data_(tempfile, &status, node->data)) {
1872 chain->status = get_equivalent_status_(status);
1876 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1878 /* copy the file postfix (everything after the metadata) */
1879 if(0 != fseek(f, chain->last_offset, SEEK_SET)) {
1880 cleanup_tempfile_(&tempfile, &tempfilename);
1881 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1884 if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) {
1885 cleanup_tempfile_(&tempfile, &tempfilename);
1886 chain->status = get_equivalent_status_(status);
1890 /* move the tempfile on top of the original */
1892 if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status))
1898 void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator)
1900 FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH);
1901 iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth];
1905 FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator)
1907 FLAC__ASSERT(iterator->depth > 0);
1909 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1910 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1914 return read_metadata_block_header_(iterator);
1917 unsigned seek_to_first_metadata_block_(FILE *f)
1919 FLAC__byte buffer[4];
1923 FLAC__ASSERT(0 != f);
1924 FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == 4);
1926 /* skip any id3v2 tag */
1927 #if !defined _MSC_VER && !defined __MINGW32__
1928 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
1931 n = fread(buffer, 1, 4, f);
1932 #if !defined _MSC_VER && !defined __MINGW32__
1933 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
1940 else if(0 == memcmp(buffer, "ID3", 3)) {
1941 unsigned tag_length = 0;
1943 /* skip to the tag length */
1944 if(fseek(f, 2, SEEK_CUR) < 0)
1947 /* read the length */
1948 for(i = 0; i < 4; i++) {
1949 if(fread(buffer, 1, 1, f) < 1 || buffer[0] & 0x80)
1952 tag_length |= (buffer[0] & 0x7f);
1955 /* skip the rest of the tag */
1956 if(fseek(f, tag_length, SEEK_CUR) < 0)
1959 /* read the stream sync code */
1960 #if !defined _MSC_VER && !defined __MINGW32__
1961 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
1964 n = fread(buffer, 1, 4, f);
1965 #if !defined _MSC_VER && !defined __MINGW32__
1966 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
1975 /* check for the fLaC signature */
1976 if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH))
1982 FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append)
1984 const long offset_end = append? iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length : iterator->offset[iterator->depth];
1986 if(0 != fseek(iterator->file, 0, SEEK_SET)) {
1987 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1990 if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) {
1991 cleanup_tempfile_(tempfile, tempfilename);
1994 if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) {
1995 cleanup_tempfile_(tempfile, tempfilename);
2002 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)
2004 long save_offset = iterator->offset[iterator->depth]; /*@@@ 2G limit */
2005 FLAC__ASSERT(0 != *tempfile);
2007 if(0 != fseek(iterator->file, save_offset + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length, SEEK_SET)) {
2008 cleanup_tempfile_(tempfile, tempfilename);
2009 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2012 if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) {
2013 cleanup_tempfile_(tempfile, tempfilename);
2017 if(fixup_is_last_code != 0) {
2019 * if code == 1, it means a block was appended to the end so
2020 * we have to clear the is_last flag of the previous block
2021 * if code == -1, it means the last block was deleted so
2022 * we have to set the is_last flag of the previous block
2024 /*@@@ MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */
2026 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2027 cleanup_tempfile_(tempfile, tempfilename);
2028 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2031 if(fread(&x, 1, 1, *tempfile) != 1) {
2032 cleanup_tempfile_(tempfile, tempfilename);
2033 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2036 if(fixup_is_last_code > 0) {
2037 FLAC__ASSERT(x & 0x80);
2041 FLAC__ASSERT(!(x & 0x80));
2044 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2045 cleanup_tempfile_(tempfile, tempfilename);
2046 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2049 if(fwrite(&x, 1, 1, *tempfile) != 1) {
2050 cleanup_tempfile_(tempfile, tempfilename);
2051 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2056 (void)fclose(iterator->file);
2058 if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status))
2061 if(iterator->has_stats)
2062 set_file_stats_(iterator->filename, &iterator->stats);
2064 if(!simple_iterator_prime_input_(iterator))
2067 while(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length < save_offset)
2068 if(!FLAC__metadata_simple_iterator_next(iterator))
2073 /* move the iterator to it's original block faster by faking a push, then doing a pop_ */
2074 FLAC__ASSERT(iterator->depth == 0);
2075 iterator->offset[0] = save_offset;
2077 return simple_iterator_pop_(iterator);
2081 FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, unsigned bytes/*@@@ 4G limit*/, FLAC__Metadata_SimpleIteratorStatus *status)
2083 FLAC__byte buffer[8192];
2087 n = min(sizeof(buffer), bytes);
2088 if(fread(buffer, 1, n, file) != n) {
2089 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2092 if(fwrite(buffer, 1, n, tempfile) != n) {
2093 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2102 FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status)
2104 FLAC__byte buffer[8192];
2107 while(!feof(file)) {
2108 n = fread(buffer, 1, sizeof(buffer), file);
2109 if(n == 0 && !feof(file)) {
2110 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2113 if(n > 0 && fwrite(buffer, 1, n, tempfile) != n) {
2114 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2122 FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
2124 static const char *tempfile_suffix = ".metadata_edit";
2125 if(0 == tempfile_path_prefix) {
2126 if(0 == (*tempfilename = malloc(strlen(filename) + strlen(tempfile_suffix) + 1))) {
2127 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2130 strcpy(*tempfilename, filename);
2131 strcat(*tempfilename, tempfile_suffix);
2134 const char *p = strrchr(filename, '/');
2140 if(0 == (*tempfilename = malloc(strlen(tempfile_path_prefix) + 1 + strlen(p) + strlen(tempfile_suffix) + 1))) {
2141 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2144 strcpy(*tempfilename, tempfile_path_prefix);
2145 strcat(*tempfilename, "/");
2146 strcat(*tempfilename, p);
2147 strcat(*tempfilename, tempfile_suffix);
2150 if(0 == (*tempfile = fopen(*tempfilename, "w+b"))) {
2151 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
2158 FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
2160 FLAC__ASSERT(0 != filename);
2161 FLAC__ASSERT(0 != tempfile);
2162 FLAC__ASSERT(0 != *tempfile);
2163 FLAC__ASSERT(0 != tempfilename);
2164 FLAC__ASSERT(0 != *tempfilename);
2165 FLAC__ASSERT(0 != status);
2167 (void)fclose(*tempfile);
2170 #if defined _MSC_VER || defined __MINGW32__
2171 if(unlink(filename) < 0) {
2172 cleanup_tempfile_(tempfile, tempfilename);
2173 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR;
2178 /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just rename(): */
2179 if(0 != rename(*tempfilename, filename)) {
2180 cleanup_tempfile_(tempfile, tempfilename);
2181 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR;
2185 cleanup_tempfile_(tempfile, tempfilename);
2190 void cleanup_tempfile_(FILE **tempfile, char **tempfilename)
2192 if(0 != *tempfile) {
2193 (void)fclose(*tempfile);
2197 if(0 != *tempfilename) {
2198 (void)unlink(*tempfilename);
2199 free(*tempfilename);
2204 FLAC__bool get_file_stats_(const char *filename, struct stat *stats)
2206 FLAC__ASSERT(0 != filename);
2207 FLAC__ASSERT(0 != stats);
2208 return (0 == stat(filename, stats));
2211 void set_file_stats_(const char *filename, struct stat *stats)
2213 struct utimbuf srctime;
2215 FLAC__ASSERT(0 != filename);
2216 FLAC__ASSERT(0 != stats);
2218 srctime.actime = stats->st_atime;
2219 srctime.modtime = stats->st_mtime;
2220 (void)chmod(filename, stats->st_mode);
2221 (void)utime(filename, &srctime);
2222 #if !defined _MSC_VER && !defined __MINGW32__
2223 (void)chown(filename, stats->st_uid, -1);
2224 (void)chown(filename, -1, stats->st_gid);
2228 FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status)
2231 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK:
2232 return FLAC__METADATA_CHAIN_STATUS_OK;
2233 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT:
2234 return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT;
2235 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE:
2236 return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
2237 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE:
2238 return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
2239 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE:
2240 return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE;
2241 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA:
2242 return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA;
2243 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR:
2244 return FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
2245 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR:
2246 return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
2247 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR:
2248 return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
2249 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR:
2250 return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR;
2251 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR:
2252 return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR;
2253 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR:
2254 return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
2255 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR:
2257 return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;