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 */
716 unsigned current_length; /*@@@ 4G limit */
719 struct FLAC__Metadata_Iterator {
720 FLAC__Metadata_Chain *chain;
721 FLAC__Metadata_Node *current;
724 const char * const FLAC__Metadata_ChainStatusString[] = {
725 "FLAC__METADATA_CHAIN_STATUS_OK",
726 "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT",
727 "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE",
728 "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE",
729 "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE",
730 "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA",
731 "FLAC__METADATA_CHAIN_STATUS_READ_ERROR",
732 "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR",
733 "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR",
734 "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR",
735 "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR",
736 "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR",
737 "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR"
741 static FLAC__Metadata_Node *node_new_()
743 FLAC__Metadata_Node *node = (FLAC__Metadata_Node*)malloc(sizeof(FLAC__Metadata_Node));
745 memset(node, 0, sizeof(FLAC__Metadata_Node));
749 static void node_delete_(FLAC__Metadata_Node *node)
751 FLAC__ASSERT(0 != node);
753 FLAC__metadata_object_delete(node->data);
757 static void chain_append_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
759 FLAC__ASSERT(0 != chain);
760 FLAC__ASSERT(0 != node);
761 FLAC__ASSERT(0 != node->data);
763 node->next = node->prev = 0;
764 node->data->is_last = true;
766 chain->tail->data->is_last = false;
771 FLAC__ASSERT(0 != chain->tail);
772 chain->tail->next = node;
773 node->prev = chain->tail;
777 chain->current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
780 static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
782 FLAC__ASSERT(0 != chain);
783 FLAC__ASSERT(0 != node);
785 if(node == chain->head)
786 chain->head = node->next;
788 node->prev->next = node->next;
790 if(node == chain->tail)
791 chain->tail = node->prev;
793 node->next->prev = node->prev;
796 chain->tail->data->is_last = true;
799 chain->current_length -= (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
802 static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
804 chain_remove_node_(chain, node);
808 static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
810 FLAC__ASSERT(0 != node);
811 FLAC__ASSERT(0 != node->data);
812 FLAC__ASSERT(0 != iterator);
813 FLAC__ASSERT(0 != iterator->current);
814 FLAC__ASSERT(0 != iterator->chain);
815 FLAC__ASSERT(0 != iterator->chain->head);
816 FLAC__ASSERT(0 != iterator->chain->tail);
818 node->data->is_last = false;
820 node->prev = iterator->current->prev;
821 node->next = iterator->current;
824 iterator->chain->head = node;
826 node->prev->next = node;
828 iterator->current->prev = node;
830 iterator->chain->nodes++;
831 iterator->chain->current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
834 static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
836 FLAC__ASSERT(0 != node);
837 FLAC__ASSERT(0 != node->data);
838 FLAC__ASSERT(0 != iterator);
839 FLAC__ASSERT(0 != iterator->current);
840 FLAC__ASSERT(0 != iterator->chain);
841 FLAC__ASSERT(0 != iterator->chain->head);
842 FLAC__ASSERT(0 != iterator->chain->tail);
844 iterator->current->data->is_last = false;
846 node->prev = iterator->current;
847 node->next = iterator->current->next;
850 iterator->chain->tail = node;
852 node->next->prev = node;
854 node->prev->next = node;
856 iterator->chain->tail->data->is_last = true;
858 iterator->chain->nodes++;
859 iterator->chain->current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
862 /* return true iff node and node->next are both padding */
863 static FLAC__bool chain_merge_adjacent_padding_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
865 if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) {
866 const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length;
867 node->data->length += growth;
868 chain->current_length += growth;
870 chain_delete_node_(chain, node->next);
877 FLAC__Metadata_Chain *FLAC__metadata_chain_new()
879 FLAC__Metadata_Chain *chain = malloc(sizeof(FLAC__Metadata_Chain));
883 chain->head = chain->tail = 0;
885 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
886 chain->initial_length = chain->current_length = 0;
892 void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain)
894 FLAC__Metadata_Node *node, *next;
896 FLAC__ASSERT(0 != chain);
898 for(node = chain->head; node; ) {
904 if(0 != chain->filename)
905 free(chain->filename);
910 FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain)
912 FLAC__Metadata_ChainStatus status;
914 FLAC__ASSERT(0 != chain);
916 status = chain->status;
917 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
921 FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename)
923 FLAC__Metadata_SimpleIterator *iterator;
924 FLAC__Metadata_Node *node;
926 FLAC__ASSERT(0 != chain);
927 FLAC__ASSERT(0 != filename);
929 if(0 == (chain->filename = strdup(filename))) {
930 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
934 if(0 == (iterator = FLAC__metadata_simple_iterator_new())) {
935 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
939 if(!FLAC__metadata_simple_iterator_init(iterator, filename, /*preserve_file_stats=*/false)) {
940 chain->status = get_equivalent_status_(iterator->status);
944 chain->first_offset = iterator->offset[iterator->depth];
949 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
952 node->data = FLAC__metadata_simple_iterator_get_block(iterator);
953 if(0 == node->data) {
955 chain->status = get_equivalent_status_(iterator->status);
958 chain_append_node_(chain, node);
959 } while(FLAC__metadata_simple_iterator_next(iterator));
961 if(!iterator->is_last || iterator->status != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) {
962 chain->status = get_equivalent_status_(iterator->status);
966 chain->last_offset = ftell(iterator->file) + iterator->length;
967 FLAC__metadata_simple_iterator_delete(iterator);
969 chain->initial_length = chain->current_length;
973 FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats)
976 const char *tempfile_path_prefix = 0;
979 if(chain->current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
980 const unsigned delta = chain->initial_length - chain->current_length;
981 chain->tail->data->length += delta;
982 chain->current_length += delta;
983 FLAC__ASSERT(chain->current_length == chain->initial_length);
985 else if(chain->current_length + FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
986 FLAC__StreamMetadata *padding;
987 FLAC__Metadata_Node *node;
988 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) {
989 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
992 padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + chain->current_length);
993 if(0 == (node = node_new_())) {
994 FLAC__metadata_object_delete(padding);
995 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
998 node->data = padding;
999 chain_append_node_(chain, node);
1000 FLAC__ASSERT(chain->current_length == chain->initial_length);
1002 else if(chain->current_length > chain->initial_length) {
1003 const unsigned delta = chain->current_length - chain->initial_length;
1004 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1005 if(chain->tail->data->length + FLAC__STREAM_METADATA_HEADER_LENGTH == delta) {
1006 chain_delete_node_(chain, chain->tail);
1007 FLAC__ASSERT(chain->current_length == chain->initial_length);
1009 else if(chain->tail->data->length >= delta) {
1010 chain->tail->data->length -= delta;
1011 chain->current_length -= delta;
1012 FLAC__ASSERT(chain->current_length == chain->initial_length);
1018 if(preserve_file_stats)
1019 get_file_stats_(chain->filename, &stats);
1021 if(chain->current_length == chain->initial_length) {
1022 if(!chain_rewrite_chain_(chain))
1026 if(!chain_rewrite_file_(chain, tempfile_path_prefix))
1030 if(preserve_file_stats)
1031 set_file_stats_(chain->filename, &stats);
1033 /* recompute lengths and offsets if necessary */
1034 if(chain->initial_length != chain->current_length) {
1035 const FLAC__Metadata_Node *node;
1036 chain->initial_length = chain->current_length;
1037 chain->last_offset = chain->first_offset;
1038 for(node = chain->head; node; node = node->next)
1039 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1045 void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain)
1047 FLAC__Metadata_Node *node;
1049 FLAC__ASSERT(0 != chain);
1051 for(node = chain->head; node; ) {
1052 if(!chain_merge_adjacent_padding_(chain, node))
1057 void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain)
1059 FLAC__Metadata_Node *node, *save;
1062 FLAC__ASSERT(0 != chain);
1065 * Don't try and be too smart... this simple algo is good enough for
1066 * the small number of nodes that we deal with.
1068 for(i = 0, node = chain->head; i < chain->nodes; i++) {
1069 if(node->data->type == FLAC__METADATA_TYPE_PADDING) {
1071 chain_remove_node_(chain, node);
1072 chain_append_node_(chain, node);
1080 FLAC__metadata_chain_merge_padding(chain);
1084 FLAC__Metadata_Iterator *FLAC__metadata_iterator_new()
1086 FLAC__Metadata_Iterator *iterator = malloc(sizeof(FLAC__Metadata_Iterator));
1089 iterator->current = 0;
1090 iterator->chain = 0;
1096 void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator)
1098 FLAC__ASSERT(0 != iterator);
1104 * Initialize the iterator to point to the first metadata block in the
1107 void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain)
1109 FLAC__ASSERT(0 != iterator);
1110 FLAC__ASSERT(0 != chain);
1111 FLAC__ASSERT(0 != chain->head);
1113 iterator->chain = chain;
1114 iterator->current = chain->head;
1117 FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator)
1119 FLAC__ASSERT(0 != iterator);
1121 if(0 == iterator->current || 0 == iterator->current->next)
1124 iterator->current = iterator->current->next;
1128 FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator)
1130 FLAC__ASSERT(0 != iterator);
1132 if(0 == iterator->current || 0 == iterator->current->prev)
1135 iterator->current = iterator->current->prev;
1139 FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator)
1141 FLAC__ASSERT(0 != iterator);
1142 FLAC__ASSERT(0 != iterator->current);
1143 FLAC__ASSERT(0 != iterator->current->data);
1145 return iterator->current->data->type;
1148 FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator)
1150 FLAC__ASSERT(0 != iterator);
1151 FLAC__ASSERT(0 != iterator->current);
1153 return iterator->current->data;
1156 FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1158 return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block);
1161 FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding)
1163 FLAC__Metadata_Node *save;
1165 FLAC__ASSERT(0 != iterator);
1166 FLAC__ASSERT(0 != iterator->current);
1168 if(0 == iterator->current->prev) {
1169 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1173 save = iterator->current->prev;
1175 if(replace_with_padding) {
1176 FLAC__metadata_object_delete_data(iterator->current->data);
1177 iterator->current->data->type = FLAC__METADATA_TYPE_PADDING;
1180 chain_delete_node_(iterator->chain, iterator->current);
1183 iterator->current = save;
1187 FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1189 FLAC__Metadata_Node *node;
1191 FLAC__ASSERT(0 != iterator);
1192 FLAC__ASSERT(0 != iterator->current);
1194 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1197 if(0 == iterator->current->prev) {
1198 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1202 if(0 == (node = node_new_()))
1206 iterator_insert_node_(iterator, node);
1207 iterator->current = node;
1211 FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1213 FLAC__Metadata_Node *node;
1215 FLAC__ASSERT(0 != iterator);
1216 FLAC__ASSERT(0 != iterator->current);
1218 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1221 if(0 == (node = node_new_()))
1225 iterator_insert_node_after_(iterator, node);
1226 iterator->current = node;
1231 /****************************************************************************
1233 * Local function definitions
1235 ***************************************************************************/
1237 void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1243 for(i = 0; i < bytes; i++) {
1244 *(--b) = (FLAC__byte)(val & 0xff);
1249 void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1253 for(i = 0; i < bytes; i++) {
1254 *(b++) = (FLAC__byte)(val & 0xff);
1259 void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes)
1265 for(i = 0; i < bytes; i++) {
1266 *(--b) = (FLAC__byte)(val & 0xff);
1271 FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes)
1273 FLAC__uint32 ret = 0;
1276 for(i = 0; i < bytes; i++)
1277 ret = (ret << 8) | (FLAC__uint32)(*b++);
1282 FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes)
1284 FLAC__uint32 ret = 0;
1289 for(i = 0; i < bytes; i++)
1290 ret = (ret << 8) | (FLAC__uint32)(*--b);
1295 FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes)
1297 FLAC__uint64 ret = 0;
1300 for(i = 0; i < bytes; i++)
1301 ret = (ret << 8) | (FLAC__uint64)(*b++);
1306 FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator)
1308 FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH];
1310 FLAC__ASSERT(0 != iterator);
1311 FLAC__ASSERT(0 != iterator->file);
1313 if(fread(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, iterator->file) != FLAC__STREAM_METADATA_HEADER_LENGTH) {
1314 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1318 iterator->is_last = raw_header[0] & 0x80? true : false;
1319 iterator->type = (FLAC__MetadataType)(raw_header[0] & 0x7f);
1320 iterator->length = unpack_uint32_(raw_header + 1, 3);
1322 /* do some checking */
1323 if(iterator->type > FLAC__METADATA_TYPE_VORBIS_COMMENT) {
1324 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA;
1331 FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block)
1333 FLAC__ASSERT(0 != iterator);
1334 FLAC__ASSERT(0 != iterator->file);
1336 switch(block->type) {
1337 case FLAC__METADATA_TYPE_STREAMINFO:
1338 iterator->status = read_metadata_block_data_streaminfo_(iterator->file, &block->data.stream_info);
1340 case FLAC__METADATA_TYPE_PADDING:
1341 iterator->status = read_metadata_block_data_padding_(iterator->file, &block->data.padding, block->length);
1343 case FLAC__METADATA_TYPE_APPLICATION:
1344 iterator->status = read_metadata_block_data_application_(iterator->file, &block->data.application, block->length);
1346 case FLAC__METADATA_TYPE_SEEKTABLE:
1347 iterator->status = read_metadata_block_data_seektable_(iterator->file, &block->data.seek_table, block->length);
1349 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1350 iterator->status = read_metadata_block_data_vorbis_comment_(iterator->file, &block->data.vorbis_comment);
1354 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR;
1357 return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1360 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_(FILE *file, FLAC__StreamMetadata_StreamInfo *block)
1362 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b;
1364 FLAC__ASSERT(0 != file);
1366 if(fread(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, file) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1367 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1371 /* @@@ we are using hardcoded numbers for simplicity but we should
1372 * probably eventually write a bit-level unpacker and use the
1373 * _STREAMINFO_ constants.
1375 block->min_blocksize = unpack_uint32_(b, 2); b += 2;
1376 block->max_blocksize = unpack_uint32_(b, 2); b += 2;
1377 block->min_framesize = unpack_uint32_(b, 3); b += 3;
1378 block->max_framesize = unpack_uint32_(b, 3); b += 3;
1379 block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4);
1380 block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
1381 block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 1) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1;
1382 block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4);
1383 memcpy(block->md5sum, b+8, 16);
1385 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1389 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_(FILE *file, FLAC__StreamMetadata_Padding *block, unsigned block_length)
1391 FLAC__ASSERT(0 != file);
1393 (void)block; /* nothing to do; we don't care about reading the padding bytes */
1395 if(0 != fseek(file, block_length, SEEK_CUR))
1396 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1398 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1401 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_(FILE *file, FLAC__StreamMetadata_Application *block, unsigned block_length)
1403 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1405 FLAC__ASSERT(0 != file);
1407 if(fread(block->id, 1, id_bytes, file) != id_bytes)
1408 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1410 block_length -= id_bytes;
1412 if(block_length == 0) {
1416 if(0 == (block->data = malloc(block_length)))
1417 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1419 if(fread(block->data, 1, block_length, file) != block_length)
1420 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1423 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1426 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_(FILE *file, FLAC__StreamMetadata_SeekTable *block, unsigned block_length)
1429 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1431 FLAC__ASSERT(0 != file);
1432 FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0);
1434 block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1436 if(block->num_points == 0)
1438 else if(0 == (block->points = malloc(block->num_points * sizeof(FLAC__StreamMetadata_SeekPoint))))
1439 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1441 for(i = 0; i < block->num_points; i++) {
1442 if(fread(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, file) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1443 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1444 /*@@@ some MAGIC NUMBERs here */
1445 block->points[i].sample_number = unpack_uint64_(buffer, 8);
1446 block->points[i].stream_offset = unpack_uint64_(buffer+8, 8);
1447 block->points[i].frame_samples = unpack_uint32_(buffer+16, 2);
1450 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1453 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_(FILE *file, FLAC__StreamMetadata_VorbisComment_Entry *entry)
1455 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1456 FLAC__byte buffer[4]; /* magic number is asserted below */
1458 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8 == 4);
1459 FLAC__ASSERT(0 != file);
1461 if(fread(buffer, 1, entry_length_len, file) != entry_length_len)
1462 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1463 entry->length = unpack_uint32_little_endian_(buffer, entry_length_len);
1465 if(entry->length == 0) {
1469 if(0 == (entry->entry = malloc(entry->length)))
1470 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1472 if(fread(entry->entry, 1, entry->length, file) != entry->length)
1473 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1476 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1479 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_(FILE *file, FLAC__StreamMetadata_VorbisComment *block)
1482 FLAC__Metadata_SimpleIteratorStatus status;
1483 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
1484 FLAC__byte buffer[4]; /* magic number is asserted below */
1486 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8 == 4);
1487 FLAC__ASSERT(0 != file);
1489 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_(file, &(block->vendor_string))))
1492 if(fread(buffer, 1, num_comments_len, file) != num_comments_len)
1493 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1494 block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len);
1496 if(block->num_comments == 0) {
1497 block->comments = 0;
1499 else if(0 == (block->comments = malloc(block->num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry))))
1500 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1502 for(i = 0; i < block->num_comments; i++) {
1503 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_(file, block->comments + i)))
1507 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1510 FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
1512 FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH];
1514 FLAC__ASSERT(0 != file);
1515 FLAC__ASSERT(0 != status);
1516 FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
1518 buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type;
1519 pack_uint32_(block->length, buffer + 1, 3);
1521 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, file) != FLAC__STREAM_METADATA_HEADER_LENGTH) {
1522 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1529 FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
1531 FLAC__ASSERT(0 != file);
1532 FLAC__ASSERT(0 != status);
1534 switch(block->type) {
1535 case FLAC__METADATA_TYPE_STREAMINFO:
1536 *status = write_metadata_block_data_streaminfo_(file, &block->data.stream_info);
1538 case FLAC__METADATA_TYPE_PADDING:
1539 *status = write_metadata_block_data_padding_(file, &block->data.padding, block->length);
1541 case FLAC__METADATA_TYPE_APPLICATION:
1542 *status = write_metadata_block_data_application_(file, &block->data.application, block->length);
1544 case FLAC__METADATA_TYPE_SEEKTABLE:
1545 *status = write_metadata_block_data_seektable_(file, &block->data.seek_table);
1547 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1548 *status = write_metadata_block_data_vorbis_comment_(file, &block->data.vorbis_comment);
1552 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR;
1554 return (*status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1557 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_streaminfo_(FILE *file, const FLAC__StreamMetadata_StreamInfo *block)
1559 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH];
1560 const unsigned channels1 = block->channels - 1;
1561 const unsigned bps1 = block->bits_per_sample - 1;
1563 FLAC__ASSERT(0 != file);
1565 /* @@@ we are using hardcoded numbers for simplicity but we should
1566 * probably eventually write a bit-level packer and use the
1567 * _STREAMINFO_ constants.
1569 pack_uint32_(block->min_blocksize, buffer, 2);
1570 pack_uint32_(block->max_blocksize, buffer+2, 2);
1571 pack_uint32_(block->min_framesize, buffer+4, 3);
1572 pack_uint32_(block->max_framesize, buffer+7, 3);
1573 buffer[10] = (block->sample_rate >> 12) & 0xff;
1574 buffer[11] = (block->sample_rate >> 4) & 0xff;
1575 buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4);
1576 buffer[13] = (FLAC__byte)(((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f));
1577 pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4);
1578 memcpy(buffer+18, block->md5sum, 16);
1580 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, file) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1581 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1583 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1586 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_padding_(FILE *file, const FLAC__StreamMetadata_Padding *block, unsigned block_length)
1588 unsigned i, n = block_length;
1589 FLAC__byte buffer[1024];
1591 FLAC__ASSERT(0 != file);
1595 memset(buffer, 0, 1024);
1597 for(i = 0; i < n/1024; i++)
1598 if(fwrite(buffer, 1, 1024, file) != 1024)
1599 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1603 if(fwrite(buffer, 1, n, file) != n)
1604 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1606 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1609 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_application_(FILE *file, const FLAC__StreamMetadata_Application *block, unsigned block_length)
1611 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1613 FLAC__ASSERT(0 != file);
1615 if(fwrite(block->id, 1, id_bytes, file) != id_bytes)
1616 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1618 block_length -= id_bytes;
1620 if(fwrite(block->data, 1, block_length, file) != block_length)
1621 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1623 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1626 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_seektable_(FILE *file, const FLAC__StreamMetadata_SeekTable *block)
1629 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1631 FLAC__ASSERT(0 != file);
1633 for(i = 0; i < block->num_points; i++) {
1634 /*@@@ some MAGIC NUMBERs here */
1635 pack_uint64_(block->points[i].sample_number, buffer, 8);
1636 pack_uint64_(block->points[i].stream_offset, buffer+8, 8);
1637 pack_uint32_(block->points[i].frame_samples, buffer+16, 2);
1638 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, file) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1639 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1642 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1645 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_vorbis_comment_(FILE *file, const FLAC__StreamMetadata_VorbisComment *block)
1648 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1649 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
1650 FLAC__byte buffer[4]; /* magic number is asserted below */
1652 FLAC__ASSERT(max(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8 == 4);
1653 FLAC__ASSERT(0 != file);
1655 pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len);
1656 if(fwrite(buffer, 1, entry_length_len, file) != entry_length_len)
1657 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1658 if(fwrite(block->vendor_string.entry, 1, block->vendor_string.length, file) != block->vendor_string.length)
1659 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1661 pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len);
1662 if(fwrite(buffer, 1, num_comments_len, file) != num_comments_len)
1663 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1665 for(i = 0; i < block->num_comments; i++) {
1666 pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len);
1667 if(fwrite(buffer, 1, entry_length_len, file) != entry_length_len)
1668 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1669 if(fwrite(block->comments[i].entry, 1, block->comments[i].length, file) != block->comments[i].length)
1670 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1673 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1676 FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block)
1678 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1679 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1683 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
1686 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
1689 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1690 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1694 return read_metadata_block_header_(iterator);
1697 FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last)
1699 FLAC__StreamMetadata *padding;
1701 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1702 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1706 block->is_last = false;
1708 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
1711 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
1714 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)))
1715 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1717 padding->is_last = padding_is_last;
1718 padding->length = padding_length;
1720 if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) {
1721 FLAC__metadata_object_delete(padding);
1725 if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) {
1726 FLAC__metadata_object_delete(padding);
1730 FLAC__metadata_object_delete(padding);
1732 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1733 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1737 return read_metadata_block_header_(iterator);
1740 FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append)
1744 int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */
1745 long fixup_is_last_flag_offset = -1;
1747 FLAC__ASSERT(0 != block || append == false);
1749 if(iterator->is_last) {
1751 fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */
1752 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
1754 else if(0 == block) {
1755 simple_iterator_push_(iterator);
1756 if(!FLAC__metadata_simple_iterator_prev(iterator)) {
1757 (void)simple_iterator_pop_(iterator);
1760 fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */
1761 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
1762 if(!simple_iterator_pop_(iterator))
1767 if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append))
1771 if(!write_metadata_block_header_(tempfile, &iterator->status, block)) {
1772 cleanup_tempfile_(&tempfile, &tempfilename);
1776 if(!write_metadata_block_data_(tempfile, &iterator->status, block)) {
1777 cleanup_tempfile_(&tempfile, &tempfilename);
1782 if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0))
1786 return FLAC__metadata_simple_iterator_next(iterator);
1791 FLAC__bool chain_rewrite_chain_(FLAC__Metadata_Chain *chain)
1794 FLAC__Metadata_Node *node;
1795 FLAC__Metadata_SimpleIteratorStatus status;
1797 FLAC__ASSERT(0 != chain);
1798 FLAC__ASSERT(0 != chain->filename);
1799 FLAC__ASSERT(0 != chain->head);
1801 if(0 == (f = fopen(chain->filename, "r+b"))) {
1802 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1805 if(0 != fseek(f, chain->first_offset, SEEK_SET)) {
1806 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1810 for(node = chain->head; node; node = node->next) {
1811 if(!write_metadata_block_header_(f, &status, node->data)) {
1812 chain->status = get_equivalent_status_(status);
1815 if(!write_metadata_block_data_(f, &status, node->data)) {
1816 chain->status = get_equivalent_status_(status);
1821 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1828 FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix)
1832 FLAC__Metadata_SimpleIteratorStatus status;
1833 const FLAC__Metadata_Node *node;
1835 FLAC__ASSERT(0 != chain);
1836 FLAC__ASSERT(0 != chain->filename);
1837 FLAC__ASSERT(0 != chain->head);
1839 /* copy the file prefix (data up to first metadata block */
1840 if(0 == (f = fopen(chain->filename, "rb"))) {
1841 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1844 if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) {
1845 chain->status = get_equivalent_status_(status);
1846 cleanup_tempfile_(&tempfile, &tempfilename);
1849 if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) {
1850 chain->status = get_equivalent_status_(status);
1851 cleanup_tempfile_(&tempfile, &tempfilename);
1855 /* write the metadata */
1856 for(node = chain->head; node; node = node->next) {
1857 if(!write_metadata_block_header_(tempfile, &status, node->data)) {
1858 chain->status = get_equivalent_status_(status);
1861 if(!write_metadata_block_data_(tempfile, &status, node->data)) {
1862 chain->status = get_equivalent_status_(status);
1866 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1868 /* copy the file postfix (everything after the metadata) */
1869 if(0 != fseek(f, chain->last_offset, SEEK_SET)) {
1870 cleanup_tempfile_(&tempfile, &tempfilename);
1871 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1874 if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) {
1875 cleanup_tempfile_(&tempfile, &tempfilename);
1876 chain->status = get_equivalent_status_(status);
1880 /* move the tempfile on top of the original */
1882 if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status))
1888 void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator)
1890 FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH);
1891 iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth];
1895 FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator)
1897 FLAC__ASSERT(iterator->depth > 0);
1899 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1900 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1904 return read_metadata_block_header_(iterator);
1907 unsigned seek_to_first_metadata_block_(FILE *f)
1909 FLAC__byte buffer[4];
1913 FLAC__ASSERT(0 != f);
1914 FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == 4);
1916 /* skip any id3v2 tag */
1917 #if !defined _MSC_VER && !defined __MINGW32__
1918 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
1921 n = fread(buffer, 1, 4, f);
1922 #if !defined _MSC_VER && !defined __MINGW32__
1923 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
1930 else if(0 == memcmp(buffer, "ID3", 3)) {
1931 unsigned tag_length = 0;
1933 /* skip to the tag length */
1934 if(fseek(f, 2, SEEK_CUR) < 0)
1937 /* read the length */
1938 for(i = 0; i < 4; i++) {
1939 if(fread(buffer, 1, 1, f) < 1 || buffer[0] & 0x80)
1942 tag_length |= (buffer[0] & 0x7f);
1945 /* skip the rest of the tag */
1946 if(fseek(f, tag_length, SEEK_CUR) < 0)
1949 /* read the stream sync code */
1950 #if !defined _MSC_VER && !defined __MINGW32__
1951 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
1954 n = fread(buffer, 1, 4, f);
1955 #if !defined _MSC_VER && !defined __MINGW32__
1956 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
1965 /* check for the fLaC signature */
1966 if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH))
1972 FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append)
1974 const long offset_end = append? iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length : iterator->offset[iterator->depth];
1976 if(0 != fseek(iterator->file, 0, SEEK_SET)) {
1977 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1980 if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) {
1981 cleanup_tempfile_(tempfile, tempfilename);
1984 if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) {
1985 cleanup_tempfile_(tempfile, tempfilename);
1992 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)
1994 long save_offset = iterator->offset[iterator->depth]; /*@@@ 2G limit */
1995 FLAC__ASSERT(0 != *tempfile);
1997 if(0 != fseek(iterator->file, save_offset + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length, SEEK_SET)) {
1998 cleanup_tempfile_(tempfile, tempfilename);
1999 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2002 if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) {
2003 cleanup_tempfile_(tempfile, tempfilename);
2007 if(fixup_is_last_code != 0) {
2009 * if code == 1, it means a block was appended to the end so
2010 * we have to clear the is_last flag of the previous block
2011 * if code == -1, it means the last block was deleted so
2012 * we have to set the is_last flag of the previous block
2014 /*@@@ MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */
2016 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2017 cleanup_tempfile_(tempfile, tempfilename);
2018 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2021 if(fread(&x, 1, 1, *tempfile) != 1) {
2022 cleanup_tempfile_(tempfile, tempfilename);
2023 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2026 if(fixup_is_last_code > 0) {
2027 FLAC__ASSERT(x & 0x80);
2031 FLAC__ASSERT(!(x & 0x80));
2034 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2035 cleanup_tempfile_(tempfile, tempfilename);
2036 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2039 if(fwrite(&x, 1, 1, *tempfile) != 1) {
2040 cleanup_tempfile_(tempfile, tempfilename);
2041 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2046 (void)fclose(iterator->file);
2048 if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status))
2051 if(iterator->has_stats)
2052 set_file_stats_(iterator->filename, &iterator->stats);
2054 if(!simple_iterator_prime_input_(iterator))
2057 while(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length < save_offset)
2058 if(!FLAC__metadata_simple_iterator_next(iterator))
2063 /* move the iterator to it's original block faster by faking a push, then doing a pop_ */
2064 FLAC__ASSERT(iterator->depth == 0);
2065 iterator->offset[0] = save_offset;
2067 return simple_iterator_pop_(iterator);
2071 FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, unsigned bytes/*@@@ 4G limit*/, FLAC__Metadata_SimpleIteratorStatus *status)
2073 FLAC__byte buffer[8192];
2077 n = min(sizeof(buffer), bytes);
2078 if(fread(buffer, 1, n, file) != n) {
2079 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2082 if(fwrite(buffer, 1, n, tempfile) != n) {
2083 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2092 FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status)
2094 FLAC__byte buffer[8192];
2097 while(!feof(file)) {
2098 n = fread(buffer, 1, sizeof(buffer), file);
2099 if(n == 0 && !feof(file)) {
2100 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2103 if(n > 0 && fwrite(buffer, 1, n, tempfile) != n) {
2104 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2112 FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
2114 static const char *tempfile_suffix = ".metadata_edit";
2115 if(0 == tempfile_path_prefix) {
2116 if(0 == (*tempfilename = malloc(strlen(filename) + strlen(tempfile_suffix) + 1))) {
2117 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2120 strcpy(*tempfilename, filename);
2121 strcat(*tempfilename, tempfile_suffix);
2124 const char *p = strrchr(filename, '/');
2130 if(0 == (*tempfilename = malloc(strlen(tempfile_path_prefix) + 1 + strlen(p) + strlen(tempfile_suffix) + 1))) {
2131 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2134 strcpy(*tempfilename, tempfile_path_prefix);
2135 strcat(*tempfilename, "/");
2136 strcat(*tempfilename, p);
2137 strcat(*tempfilename, tempfile_suffix);
2140 if(0 == (*tempfile = fopen(*tempfilename, "w+b"))) {
2141 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
2148 FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
2150 FLAC__ASSERT(0 != filename);
2151 FLAC__ASSERT(0 != tempfile);
2152 FLAC__ASSERT(0 != *tempfile);
2153 FLAC__ASSERT(0 != tempfilename);
2154 FLAC__ASSERT(0 != *tempfilename);
2155 FLAC__ASSERT(0 != status);
2157 (void)fclose(*tempfile);
2160 #if defined _MSC_VER || defined __MINGW32__
2161 if(unlink(filename) < 0) {
2162 cleanup_tempfile_(tempfile, tempfilename);
2163 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR;
2168 /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just rename(): */
2169 if(0 != rename(*tempfilename, filename)) {
2170 cleanup_tempfile_(tempfile, tempfilename);
2171 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR;
2175 cleanup_tempfile_(tempfile, tempfilename);
2180 void cleanup_tempfile_(FILE **tempfile, char **tempfilename)
2182 if(0 != *tempfile) {
2183 (void)fclose(*tempfile);
2187 if(0 != *tempfilename) {
2188 (void)unlink(*tempfilename);
2189 free(*tempfilename);
2194 FLAC__bool get_file_stats_(const char *filename, struct stat *stats)
2196 FLAC__ASSERT(0 != filename);
2197 FLAC__ASSERT(0 != stats);
2198 return (0 == stat(filename, stats));
2201 void set_file_stats_(const char *filename, struct stat *stats)
2203 struct utimbuf srctime;
2205 FLAC__ASSERT(0 != filename);
2206 FLAC__ASSERT(0 != stats);
2208 srctime.actime = stats->st_atime;
2209 srctime.modtime = stats->st_mtime;
2210 (void)chmod(filename, stats->st_mode);
2211 (void)utime(filename, &srctime);
2212 #if !defined _MSC_VER && !defined __MINGW32__
2213 (void)chown(filename, stats->st_uid, -1);
2214 (void)chown(filename, -1, stats->st_gid);
2218 FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status)
2221 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK:
2222 return FLAC__METADATA_CHAIN_STATUS_OK;
2223 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT:
2224 return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT;
2225 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE:
2226 return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
2227 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE:
2228 return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
2229 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE:
2230 return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE;
2231 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA:
2232 return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA;
2233 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR:
2234 return FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
2235 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR:
2236 return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
2237 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR:
2238 return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
2239 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR:
2240 return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR;
2241 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR:
2242 return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR;
2243 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR:
2244 return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
2245 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR:
2247 return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;