1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2001,2002,2003 Josh Coalson
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
25 #if defined _MSC_VER || defined __MINGW32__
26 #include <sys/utime.h> /* for utime() */
27 #include <io.h> /* for chmod() */
29 #include <sys/types.h> /* some flavors of BSD (like OS X) require this to get time_t */
30 #include <utime.h> /* for utime() */
31 #include <unistd.h> /* for chown(), unlink() */
33 #include <sys/stat.h> /* for stat(), maybe chmod() */
35 #include "private/metadata.h"
37 #include "FLAC/assert.h"
38 #include "FLAC/file_decoder.h"
43 #define max(a,b) ((a)>(b)?(a):(b))
47 #define min(a,b) ((a)<(b)?(a):(b))
50 /****************************************************************************
52 * Local function declarations
54 ***************************************************************************/
56 static void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
57 static void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
58 static void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes);
59 static FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes);
60 static FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes);
61 static FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes);
63 static FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator);
64 static FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block);
65 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_(FILE *file, FLAC__StreamMetadata_StreamInfo *block);
66 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_(FILE *file, FLAC__StreamMetadata_Padding *block, unsigned block_length);
67 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_(FILE *file, FLAC__StreamMetadata_Application *block, unsigned block_length);
68 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_(FILE *file, FLAC__StreamMetadata_SeekTable *block, unsigned block_length);
69 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_(FILE *file, FLAC__StreamMetadata_VorbisComment_Entry *entry);
70 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_(FILE *file, FLAC__StreamMetadata_VorbisComment *block);
71 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_(FILE *file, FLAC__StreamMetadata_CueSheet_Track *track);
72 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_(FILE *file, FLAC__StreamMetadata_CueSheet *block);
73 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_(FILE *file, FLAC__StreamMetadata_Unknown *block, unsigned block_length);
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__Metadata_SimpleIteratorStatus write_metadata_block_data_cuesheet_(FILE *file, const FLAC__StreamMetadata_CueSheet *block);
83 static FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_unknown_(FILE *file, const FLAC__StreamMetadata_Unknown *block, unsigned block_length);
84 static FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block);
85 static FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last);
86 static FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append);
88 static FLAC__bool chain_rewrite_chain_(FLAC__Metadata_Chain *chain);
89 static FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix);
91 static void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator);
92 static FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator);
94 /* return 0 if OK, 1 if read error, 2 if not a FLAC file */
95 static unsigned seek_to_first_metadata_block_(FILE *f);
97 static FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append);
98 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);
100 static FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, unsigned bytes/*@@@ 4G limit*/, FLAC__Metadata_SimpleIteratorStatus *status);
101 static FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status);
103 static FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
104 static FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
105 static void cleanup_tempfile_(FILE **tempfile, char **tempfilename);
107 static FLAC__bool get_file_stats_(const char *filename, struct stat *stats);
108 static void set_file_stats_(const char *filename, struct stat *stats);
110 static FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status);
113 #ifdef FLAC__VALGRIND_TESTING
114 static size_t local__fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
116 size_t ret = fwrite(ptr, size, nmemb, stream);
122 #define local__fwrite fwrite
125 /****************************************************************************
127 * Level 0 implementation
129 ***************************************************************************/
131 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
132 static void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
133 static void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
136 FLAC__bool got_error;
137 FLAC__bool got_streaminfo;
138 FLAC__StreamMetadata *streaminfo;
139 } level0_client_data;
141 FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo)
143 level0_client_data cd;
144 FLAC__FileDecoder *decoder;
146 FLAC__ASSERT(0 != filename);
147 FLAC__ASSERT(0 != streaminfo);
149 decoder = FLAC__file_decoder_new();
154 cd.got_error = false;
155 cd.got_streaminfo = false;
156 cd.streaminfo = streaminfo;
158 FLAC__file_decoder_set_md5_checking(decoder, false);
159 FLAC__file_decoder_set_filename(decoder, filename);
160 FLAC__file_decoder_set_metadata_ignore_all(decoder);
161 FLAC__file_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO);
162 FLAC__file_decoder_set_write_callback(decoder, write_callback_);
163 FLAC__file_decoder_set_metadata_callback(decoder, metadata_callback_);
164 FLAC__file_decoder_set_error_callback(decoder, error_callback_);
165 FLAC__file_decoder_set_client_data(decoder, &cd);
167 if(FLAC__file_decoder_init(decoder) != FLAC__FILE_DECODER_OK || cd.got_error) {
168 FLAC__file_decoder_finish(decoder);
169 FLAC__file_decoder_delete(decoder);
173 /* the first thing decoded must be the STREAMINFO block: */
174 if(!FLAC__file_decoder_process_until_end_of_metadata(decoder) || cd.got_error) {
175 FLAC__file_decoder_finish(decoder);
176 FLAC__file_decoder_delete(decoder);
180 FLAC__file_decoder_finish(decoder);
181 FLAC__file_decoder_delete(decoder);
183 return !cd.got_error && cd.got_streaminfo;
186 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
188 (void)decoder, (void)frame, (void)buffer, (void)client_data;
190 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
193 void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
195 level0_client_data *cd = (level0_client_data *)client_data;
198 if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO && 0 != cd->streaminfo) {
199 *(cd->streaminfo) = *metadata;
200 cd->got_streaminfo = true;
204 void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
206 level0_client_data *cd = (level0_client_data *)client_data;
209 if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
210 cd->got_error = true;
214 /****************************************************************************
216 * Level 1 implementation
218 ***************************************************************************/
220 #define SIMPLE_ITERATOR_MAX_PUSH_DEPTH (1+4)
221 /* 1 for initial offset, +4 for our own personal use */
223 struct FLAC__Metadata_SimpleIterator {
225 char *filename, *tempfile_path_prefix;
227 FLAC__bool has_stats;
228 FLAC__bool is_writable;
229 FLAC__Metadata_SimpleIteratorStatus status;
230 /*@@@ 2G limits here because of the offset type: */
231 long offset[SIMPLE_ITERATOR_MAX_PUSH_DEPTH];
232 long first_offset; /* this is the offset to the STREAMINFO block */
234 /* this is the metadata block header of the current block we are pointing to: */
236 FLAC__MetadataType type;
240 FLAC_API const char * const FLAC__Metadata_SimpleIteratorStatusString[] = {
241 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK",
242 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT",
243 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE",
244 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE",
245 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE",
246 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA",
247 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR",
248 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR",
249 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR",
250 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR",
251 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR",
252 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR",
253 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR"
257 FLAC_API FLAC__Metadata_SimpleIterator *FLAC__metadata_simple_iterator_new()
259 FLAC__Metadata_SimpleIterator *iterator = (FLAC__Metadata_SimpleIterator*)calloc(1, sizeof(FLAC__Metadata_SimpleIterator));
263 iterator->filename = 0;
264 iterator->tempfile_path_prefix = 0;
265 iterator->has_stats = false;
266 iterator->is_writable = false;
267 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
268 iterator->first_offset = iterator->offset[0] = -1;
275 static void simple_iterator_free_guts_(FLAC__Metadata_SimpleIterator *iterator)
277 FLAC__ASSERT(0 != iterator);
279 if(0 != iterator->file) {
280 fclose(iterator->file);
282 if(iterator->has_stats)
283 set_file_stats_(iterator->filename, &iterator->stats);
285 if(0 != iterator->filename) {
286 free(iterator->filename);
287 iterator->filename = 0;
289 if(0 != iterator->tempfile_path_prefix) {
290 free(iterator->tempfile_path_prefix);
291 iterator->tempfile_path_prefix = 0;
295 FLAC_API void FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator *iterator)
297 FLAC__ASSERT(0 != iterator);
299 simple_iterator_free_guts_(iterator);
303 FLAC_API FLAC__Metadata_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator *iterator)
305 FLAC__Metadata_SimpleIteratorStatus status;
307 FLAC__ASSERT(0 != iterator);
309 status = iterator->status;
310 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
314 static FLAC__bool simple_iterator_prime_input_(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool read_only)
318 FLAC__ASSERT(0 != iterator);
320 if(read_only || 0 == (iterator->file = fopen(iterator->filename, "r+b"))) {
321 iterator->is_writable = false;
322 if(read_only || errno == EACCES) {
323 if(0 == (iterator->file = fopen(iterator->filename, "rb"))) {
324 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
329 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
334 iterator->is_writable = true;
337 ret = seek_to_first_metadata_block_(iterator->file);
341 iterator->first_offset = iterator->offset[iterator->depth] = ftell(iterator->file);
342 return read_metadata_block_header_(iterator);
344 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
347 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE;
356 @@@ If we decide to finish implementing this, put this comment back in metadata.h
358 * The 'tempfile_path_prefix' allows you to specify a directory where
359 * tempfiles should go. Remember that if your metadata edits cause the
360 * FLAC file to grow, the entire file will have to be rewritten. If
361 * 'tempfile_path_prefix' is NULL, the temp file will be written in the
362 * same directory as the original FLAC file. This makes replacing the
363 * original with the tempfile fast but requires extra space in the same
364 * partition for the tempfile. If space is a problem, you can pass a
365 * directory name belonging to a different partition in
366 * 'tempfile_path_prefix'. Note that you should use the forward slash
367 * '/' as the directory separator. A trailing slash is not needed; it
368 * will be added automatically.
370 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats, const char *tempfile_path_prefix);
373 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool read_only, FLAC__bool preserve_file_stats)
375 const char *tempfile_path_prefix = 0; /*@@@ search for comments near 'rename(...)' for what it will take to finish implementing this */
377 FLAC__ASSERT(0 != iterator);
378 FLAC__ASSERT(0 != filename);
380 simple_iterator_free_guts_(iterator);
382 if(!read_only && preserve_file_stats)
383 iterator->has_stats = get_file_stats_(filename, &iterator->stats);
385 if(0 == (iterator->filename = strdup(filename))) {
386 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
389 if(0 != tempfile_path_prefix && 0 == (iterator->tempfile_path_prefix = strdup(tempfile_path_prefix))) {
390 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
394 return simple_iterator_prime_input_(iterator, read_only);
397 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator *iterator)
399 FLAC__ASSERT(0 != iterator);
400 FLAC__ASSERT(0 != iterator->file);
402 return iterator->is_writable;
405 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator *iterator)
407 FLAC__ASSERT(0 != iterator);
408 FLAC__ASSERT(0 != iterator->file);
410 if(iterator->is_last)
413 if(0 != fseek(iterator->file, iterator->length, SEEK_CUR)) {
414 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
418 iterator->offset[iterator->depth] = ftell(iterator->file);
420 return read_metadata_block_header_(iterator);
423 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator *iterator)
427 FLAC__ASSERT(0 != iterator);
428 FLAC__ASSERT(0 != iterator->file);
430 if(iterator->offset[iterator->depth] == iterator->first_offset)
433 if(0 != fseek(iterator->file, iterator->first_offset, SEEK_SET)) {
434 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
437 this_offset = iterator->first_offset;
438 if(!read_metadata_block_header_(iterator))
441 /* we ignore any error from ftell() and catch it in fseek() */
442 while(ftell(iterator->file) + (long)iterator->length < iterator->offset[iterator->depth]) {
443 if(0 != fseek(iterator->file, iterator->length, SEEK_CUR)) {
444 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
447 this_offset = ftell(iterator->file);
448 if(!read_metadata_block_header_(iterator))
452 iterator->offset[iterator->depth] = this_offset;
457 FLAC_API FLAC__MetadataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator *iterator)
459 FLAC__ASSERT(0 != iterator);
460 FLAC__ASSERT(0 != iterator->file);
462 return iterator->type;
465 FLAC_API FLAC__StreamMetadata *FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator *iterator)
467 FLAC__StreamMetadata *block = FLAC__metadata_object_new(iterator->type);
469 FLAC__ASSERT(0 != iterator);
470 FLAC__ASSERT(0 != iterator->file);
473 block->is_last = iterator->is_last;
474 block->length = iterator->length;
476 if(!read_metadata_block_data_(iterator, block)) {
477 FLAC__metadata_object_delete(block);
481 /* back up to the beginning of the block data to stay consistent */
482 if(0 != fseek(iterator->file, iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH, SEEK_SET)) {
483 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
484 FLAC__metadata_object_delete(block);
489 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
494 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
496 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth];)
499 FLAC__ASSERT(0 != iterator);
500 FLAC__ASSERT(0 != iterator->file);
501 FLAC__ASSERT(0 != block);
503 if(!iterator->is_writable) {
504 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE;
508 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO || block->type == FLAC__METADATA_TYPE_STREAMINFO) {
509 if(iterator->type != block->type) {
510 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
515 block->is_last = iterator->is_last;
517 if(iterator->length == block->length)
518 return write_metadata_block_stationary_(iterator, block);
519 else if(iterator->length > block->length) {
520 if(use_padding && iterator->length >= FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) {
521 ret = write_metadata_block_stationary_with_padding_(iterator, block, iterator->length - FLAC__STREAM_METADATA_HEADER_LENGTH - block->length, block->is_last);
522 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
523 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
527 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
528 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
529 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
533 else /* iterator->length < block->length */ {
534 unsigned padding_leftover = 0;
535 FLAC__bool padding_is_last = false;
537 /* first see if we can even use padding */
538 if(iterator->is_last) {
542 const unsigned extra_padding_bytes_required = block->length - iterator->length;
543 simple_iterator_push_(iterator);
544 if(!FLAC__metadata_simple_iterator_next(iterator)) {
545 (void)simple_iterator_pop_(iterator);
548 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
552 if(FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length == extra_padding_bytes_required) {
553 padding_leftover = 0;
554 block->is_last = iterator->is_last;
556 else if(iterator->length < extra_padding_bytes_required)
559 padding_leftover = FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length - extra_padding_bytes_required;
560 padding_is_last = iterator->is_last;
561 block->is_last = false;
564 if(!simple_iterator_pop_(iterator))
569 if(padding_leftover == 0) {
570 ret = write_metadata_block_stationary_(iterator, block);
571 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
572 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
576 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
577 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
578 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
579 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
584 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
585 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
586 FLAC__ASSERT(!ret || ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
592 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
594 unsigned padding_leftover = 0;
595 FLAC__bool padding_is_last = false;
597 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length;)
600 FLAC__ASSERT(0 != iterator);
601 FLAC__ASSERT(0 != iterator->file);
602 FLAC__ASSERT(0 != block);
604 if(!iterator->is_writable)
607 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) {
608 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
612 block->is_last = iterator->is_last;
615 /* first see if we can even use padding */
616 if(iterator->is_last) {
620 simple_iterator_push_(iterator);
621 if(!FLAC__metadata_simple_iterator_next(iterator)) {
622 (void)simple_iterator_pop_(iterator);
625 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
629 if(iterator->length == block->length) {
630 padding_leftover = 0;
631 block->is_last = iterator->is_last;
633 else if(iterator->length < FLAC__STREAM_METADATA_HEADER_LENGTH + block->length)
636 padding_leftover = iterator->length - block->length;
637 padding_is_last = iterator->is_last;
638 block->is_last = false;
641 if(!simple_iterator_pop_(iterator))
646 /* move to the next block, which is suitable padding */
647 if(!FLAC__metadata_simple_iterator_next(iterator))
649 if(padding_leftover == 0) {
650 ret = write_metadata_block_stationary_(iterator, block);
651 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
652 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
656 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
657 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
658 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
659 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
664 ret = rewrite_whole_file_(iterator, block, /*append=*/true);
665 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
666 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
671 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool use_padding)
673 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth];)
676 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO) {
677 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
682 FLAC__StreamMetadata *padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
684 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
687 padding->length = iterator->length;
688 if(!FLAC__metadata_simple_iterator_set_block(iterator, padding, false)) {
689 FLAC__metadata_object_delete(padding);
692 FLAC__metadata_object_delete(padding);
693 if(!FLAC__metadata_simple_iterator_prev(iterator))
695 FLAC__ASSERT(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length == debug_target_offset);
696 FLAC__ASSERT(ftell(iterator->file) + (long)iterator->length == debug_target_offset);
700 ret = rewrite_whole_file_(iterator, 0, /*append=*/false);
701 FLAC__ASSERT(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length == debug_target_offset);
702 FLAC__ASSERT(ftell(iterator->file) + (long)iterator->length == debug_target_offset);
709 /****************************************************************************
711 * Level 2 implementation
713 ***************************************************************************/
716 typedef struct FLAC__Metadata_Node {
717 FLAC__StreamMetadata *data;
718 struct FLAC__Metadata_Node *prev, *next;
719 } FLAC__Metadata_Node;
721 struct FLAC__Metadata_Chain {
723 FLAC__Metadata_Node *head;
724 FLAC__Metadata_Node *tail;
726 FLAC__Metadata_ChainStatus status;
727 long first_offset, last_offset; /*@@@ 2G limit */
729 * This is the length of the chain initially read from the FLAC file.
730 * it is used to compare against the current length to decide whether
731 * or not the whole file has to be rewritten.
733 unsigned initial_length; /*@@@ 4G limit */
736 struct FLAC__Metadata_Iterator {
737 FLAC__Metadata_Chain *chain;
738 FLAC__Metadata_Node *current;
741 FLAC_API const char * const FLAC__Metadata_ChainStatusString[] = {
742 "FLAC__METADATA_CHAIN_STATUS_OK",
743 "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT",
744 "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE",
745 "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE",
746 "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE",
747 "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA",
748 "FLAC__METADATA_CHAIN_STATUS_READ_ERROR",
749 "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR",
750 "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR",
751 "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR",
752 "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR",
753 "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR",
754 "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR"
758 static FLAC__Metadata_Node *node_new_()
760 return (FLAC__Metadata_Node*)calloc(1, sizeof(FLAC__Metadata_Node));
763 static void node_delete_(FLAC__Metadata_Node *node)
765 FLAC__ASSERT(0 != node);
767 FLAC__metadata_object_delete(node->data);
771 static void chain_append_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
773 FLAC__ASSERT(0 != chain);
774 FLAC__ASSERT(0 != node);
775 FLAC__ASSERT(0 != node->data);
777 node->next = node->prev = 0;
778 node->data->is_last = true;
780 chain->tail->data->is_last = false;
785 FLAC__ASSERT(0 != chain->tail);
786 chain->tail->next = node;
787 node->prev = chain->tail;
793 static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
795 FLAC__ASSERT(0 != chain);
796 FLAC__ASSERT(0 != node);
798 if(node == chain->head)
799 chain->head = node->next;
801 node->prev->next = node->next;
803 if(node == chain->tail)
804 chain->tail = node->prev;
806 node->next->prev = node->prev;
809 chain->tail->data->is_last = true;
814 static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
816 chain_remove_node_(chain, node);
820 static unsigned chain_calculate_length_(FLAC__Metadata_Chain *chain)
822 const FLAC__Metadata_Node *node;
824 for(node = chain->head; node; node = node->next)
825 length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
829 static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
831 FLAC__ASSERT(0 != node);
832 FLAC__ASSERT(0 != node->data);
833 FLAC__ASSERT(0 != iterator);
834 FLAC__ASSERT(0 != iterator->current);
835 FLAC__ASSERT(0 != iterator->chain);
836 FLAC__ASSERT(0 != iterator->chain->head);
837 FLAC__ASSERT(0 != iterator->chain->tail);
839 node->data->is_last = false;
841 node->prev = iterator->current->prev;
842 node->next = iterator->current;
845 iterator->chain->head = node;
847 node->prev->next = node;
849 iterator->current->prev = node;
851 iterator->chain->nodes++;
854 static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
856 FLAC__ASSERT(0 != node);
857 FLAC__ASSERT(0 != node->data);
858 FLAC__ASSERT(0 != iterator);
859 FLAC__ASSERT(0 != iterator->current);
860 FLAC__ASSERT(0 != iterator->chain);
861 FLAC__ASSERT(0 != iterator->chain->head);
862 FLAC__ASSERT(0 != iterator->chain->tail);
864 iterator->current->data->is_last = false;
866 node->prev = iterator->current;
867 node->next = iterator->current->next;
870 iterator->chain->tail = node;
872 node->next->prev = node;
874 node->prev->next = node;
876 iterator->chain->tail->data->is_last = true;
878 iterator->chain->nodes++;
881 /* return true iff node and node->next are both padding */
882 static FLAC__bool chain_merge_adjacent_padding_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
884 if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) {
885 const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length;
886 node->data->length += growth;
888 chain_delete_node_(chain, node->next);
895 FLAC_API FLAC__Metadata_Chain *FLAC__metadata_chain_new()
897 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)calloc(1, sizeof(FLAC__Metadata_Chain));
901 chain->head = chain->tail = 0;
903 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
904 chain->initial_length = 0;
910 FLAC_API void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain)
912 FLAC__Metadata_Node *node, *next;
914 FLAC__ASSERT(0 != chain);
916 for(node = chain->head; node; ) {
922 if(0 != chain->filename)
923 free(chain->filename);
928 FLAC_API FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain)
930 FLAC__Metadata_ChainStatus status;
932 FLAC__ASSERT(0 != chain);
934 status = chain->status;
935 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
939 FLAC_API FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename)
941 FLAC__Metadata_SimpleIterator *iterator;
942 FLAC__Metadata_Node *node;
944 FLAC__ASSERT(0 != chain);
945 FLAC__ASSERT(0 != filename);
947 if(0 == (chain->filename = strdup(filename))) {
948 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
952 if(0 == (iterator = FLAC__metadata_simple_iterator_new())) {
953 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
957 if(!FLAC__metadata_simple_iterator_init(iterator, filename, /*read_only=*/true, /*preserve_file_stats=*/false)) {
958 chain->status = get_equivalent_status_(iterator->status);
962 chain->first_offset = iterator->offset[iterator->depth];
967 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
970 node->data = FLAC__metadata_simple_iterator_get_block(iterator);
971 if(0 == node->data) {
973 chain->status = get_equivalent_status_(iterator->status);
976 chain_append_node_(chain, node);
977 } while(FLAC__metadata_simple_iterator_next(iterator));
979 if(!iterator->is_last || iterator->status != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) {
980 chain->status = get_equivalent_status_(iterator->status);
984 chain->last_offset = ftell(iterator->file) + iterator->length;
985 FLAC__metadata_simple_iterator_delete(iterator);
987 chain->initial_length = chain_calculate_length_(chain);
991 FLAC_API FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats)
994 const char *tempfile_path_prefix = 0;
995 unsigned current_length;
997 FLAC__ASSERT(0 != chain);
999 current_length = chain_calculate_length_(chain);
1002 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1003 const unsigned delta = chain->initial_length - current_length;
1004 chain->tail->data->length += delta;
1005 current_length += delta;
1006 FLAC__ASSERT(current_length == chain->initial_length);
1008 else if(current_length + FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
1009 FLAC__StreamMetadata *padding;
1010 FLAC__Metadata_Node *node;
1011 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) {
1012 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1015 padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + current_length);
1016 if(0 == (node = node_new_())) {
1017 FLAC__metadata_object_delete(padding);
1018 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1021 node->data = padding;
1022 chain_append_node_(chain, node);
1023 current_length = chain_calculate_length_(chain);
1024 FLAC__ASSERT(current_length == chain->initial_length);
1026 else if(current_length > chain->initial_length) {
1027 const unsigned delta = current_length - chain->initial_length;
1028 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1029 if(chain->tail->data->length + FLAC__STREAM_METADATA_HEADER_LENGTH == delta) {
1030 chain_delete_node_(chain, chain->tail);
1031 current_length = chain_calculate_length_(chain);
1032 FLAC__ASSERT(current_length == chain->initial_length);
1034 else if(chain->tail->data->length >= delta) {
1035 chain->tail->data->length -= delta;
1036 current_length -= delta;
1037 FLAC__ASSERT(current_length == chain->initial_length);
1043 if(preserve_file_stats)
1044 get_file_stats_(chain->filename, &stats);
1046 if(current_length == chain->initial_length) {
1047 if(!chain_rewrite_chain_(chain))
1051 if(!chain_rewrite_file_(chain, tempfile_path_prefix))
1055 if(preserve_file_stats)
1056 set_file_stats_(chain->filename, &stats);
1058 /* recompute lengths and offsets if necessary */
1059 if(chain->initial_length != current_length) {
1060 const FLAC__Metadata_Node *node;
1061 chain->initial_length = current_length;
1062 chain->last_offset = chain->first_offset;
1063 for(node = chain->head; node; node = node->next)
1064 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1070 FLAC_API void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain)
1072 FLAC__Metadata_Node *node;
1074 FLAC__ASSERT(0 != chain);
1076 for(node = chain->head; node; ) {
1077 if(!chain_merge_adjacent_padding_(chain, node))
1082 FLAC_API void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain)
1084 FLAC__Metadata_Node *node, *save;
1087 FLAC__ASSERT(0 != chain);
1090 * Don't try and be too smart... this simple algo is good enough for
1091 * the small number of nodes that we deal with.
1093 for(i = 0, node = chain->head; i < chain->nodes; i++) {
1094 if(node->data->type == FLAC__METADATA_TYPE_PADDING) {
1096 chain_remove_node_(chain, node);
1097 chain_append_node_(chain, node);
1105 FLAC__metadata_chain_merge_padding(chain);
1109 FLAC_API FLAC__Metadata_Iterator *FLAC__metadata_iterator_new()
1111 FLAC__Metadata_Iterator *iterator = (FLAC__Metadata_Iterator*)calloc(1, sizeof(FLAC__Metadata_Iterator));
1113 /* calloc() implies:
1114 iterator->current = 0;
1115 iterator->chain = 0;
1121 FLAC_API void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator)
1123 FLAC__ASSERT(0 != iterator);
1128 FLAC_API void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain)
1130 FLAC__ASSERT(0 != iterator);
1131 FLAC__ASSERT(0 != chain);
1132 FLAC__ASSERT(0 != chain->head);
1134 iterator->chain = chain;
1135 iterator->current = chain->head;
1138 FLAC_API FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator)
1140 FLAC__ASSERT(0 != iterator);
1142 if(0 == iterator->current || 0 == iterator->current->next)
1145 iterator->current = iterator->current->next;
1149 FLAC_API FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator)
1151 FLAC__ASSERT(0 != iterator);
1153 if(0 == iterator->current || 0 == iterator->current->prev)
1156 iterator->current = iterator->current->prev;
1160 FLAC_API FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator)
1162 FLAC__ASSERT(0 != iterator);
1163 FLAC__ASSERT(0 != iterator->current);
1164 FLAC__ASSERT(0 != iterator->current->data);
1166 return iterator->current->data->type;
1169 FLAC_API FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator)
1171 FLAC__ASSERT(0 != iterator);
1172 FLAC__ASSERT(0 != iterator->current);
1174 return iterator->current->data;
1177 FLAC_API FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1179 FLAC__ASSERT(0 != iterator);
1180 FLAC__ASSERT(0 != block);
1181 return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block);
1184 FLAC_API FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding)
1186 FLAC__Metadata_Node *save;
1188 FLAC__ASSERT(0 != iterator);
1189 FLAC__ASSERT(0 != iterator->current);
1191 if(0 == iterator->current->prev) {
1192 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1196 save = iterator->current->prev;
1198 if(replace_with_padding) {
1199 FLAC__metadata_object_delete_data(iterator->current->data);
1200 iterator->current->data->type = FLAC__METADATA_TYPE_PADDING;
1203 chain_delete_node_(iterator->chain, iterator->current);
1206 iterator->current = save;
1210 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1212 FLAC__Metadata_Node *node;
1214 FLAC__ASSERT(0 != iterator);
1215 FLAC__ASSERT(0 != iterator->current);
1216 FLAC__ASSERT(0 != block);
1218 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1221 if(0 == iterator->current->prev) {
1222 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1226 if(0 == (node = node_new_()))
1230 iterator_insert_node_(iterator, node);
1231 iterator->current = node;
1235 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1237 FLAC__Metadata_Node *node;
1239 FLAC__ASSERT(0 != iterator);
1240 FLAC__ASSERT(0 != iterator->current);
1241 FLAC__ASSERT(0 != block);
1243 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1246 if(0 == (node = node_new_()))
1250 iterator_insert_node_after_(iterator, node);
1251 iterator->current = node;
1256 /****************************************************************************
1258 * Local function definitions
1260 ***************************************************************************/
1262 void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1268 for(i = 0; i < bytes; i++) {
1269 *(--b) = (FLAC__byte)(val & 0xff);
1274 void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1278 for(i = 0; i < bytes; i++) {
1279 *(b++) = (FLAC__byte)(val & 0xff);
1284 void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes)
1290 for(i = 0; i < bytes; i++) {
1291 *(--b) = (FLAC__byte)(val & 0xff);
1296 FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes)
1298 FLAC__uint32 ret = 0;
1301 for(i = 0; i < bytes; i++)
1302 ret = (ret << 8) | (FLAC__uint32)(*b++);
1307 FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes)
1309 FLAC__uint32 ret = 0;
1314 for(i = 0; i < bytes; i++)
1315 ret = (ret << 8) | (FLAC__uint32)(*--b);
1320 FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes)
1322 FLAC__uint64 ret = 0;
1325 for(i = 0; i < bytes; i++)
1326 ret = (ret << 8) | (FLAC__uint64)(*b++);
1331 FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator)
1333 FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH];
1335 FLAC__ASSERT(0 != iterator);
1336 FLAC__ASSERT(0 != iterator->file);
1338 if(fread(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, iterator->file) != FLAC__STREAM_METADATA_HEADER_LENGTH) {
1339 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1343 iterator->is_last = raw_header[0] & 0x80? true : false;
1344 iterator->type = (FLAC__MetadataType)(raw_header[0] & 0x7f);
1345 iterator->length = unpack_uint32_(raw_header + 1, 3);
1347 /* Note that we don't check:
1348 * if(iterator->type >= FLAC__METADATA_TYPE_UNDEFINED)
1349 * we just will read in an opaque block
1355 FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block)
1357 FLAC__ASSERT(0 != iterator);
1358 FLAC__ASSERT(0 != iterator->file);
1360 switch(block->type) {
1361 case FLAC__METADATA_TYPE_STREAMINFO:
1362 iterator->status = read_metadata_block_data_streaminfo_(iterator->file, &block->data.stream_info);
1364 case FLAC__METADATA_TYPE_PADDING:
1365 iterator->status = read_metadata_block_data_padding_(iterator->file, &block->data.padding, block->length);
1367 case FLAC__METADATA_TYPE_APPLICATION:
1368 iterator->status = read_metadata_block_data_application_(iterator->file, &block->data.application, block->length);
1370 case FLAC__METADATA_TYPE_SEEKTABLE:
1371 iterator->status = read_metadata_block_data_seektable_(iterator->file, &block->data.seek_table, block->length);
1373 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1374 iterator->status = read_metadata_block_data_vorbis_comment_(iterator->file, &block->data.vorbis_comment);
1376 case FLAC__METADATA_TYPE_CUESHEET:
1377 iterator->status = read_metadata_block_data_cuesheet_(iterator->file, &block->data.cue_sheet);
1380 iterator->status = read_metadata_block_data_unknown_(iterator->file, &block->data.unknown, block->length);
1384 return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1387 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_(FILE *file, FLAC__StreamMetadata_StreamInfo *block)
1389 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b;
1391 FLAC__ASSERT(0 != file);
1393 if(fread(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, file) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1394 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1398 /* @@@ we are using hardcoded numbers for simplicity but we should
1399 * probably eventually write a bit-level unpacker and use the
1400 * _STREAMINFO_ constants.
1402 block->min_blocksize = unpack_uint32_(b, 2); b += 2;
1403 block->max_blocksize = unpack_uint32_(b, 2); b += 2;
1404 block->min_framesize = unpack_uint32_(b, 3); b += 3;
1405 block->max_framesize = unpack_uint32_(b, 3); b += 3;
1406 block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4);
1407 block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
1408 block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 4) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1;
1409 block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4);
1410 memcpy(block->md5sum, b+8, 16);
1412 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1416 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_(FILE *file, FLAC__StreamMetadata_Padding *block, unsigned block_length)
1418 FLAC__ASSERT(0 != file);
1420 (void)block; /* nothing to do; we don't care about reading the padding bytes */
1422 if(0 != fseek(file, block_length, SEEK_CUR))
1423 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1425 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1428 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_(FILE *file, FLAC__StreamMetadata_Application *block, unsigned block_length)
1430 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1432 FLAC__ASSERT(0 != file);
1434 if(fread(block->id, 1, id_bytes, file) != id_bytes)
1435 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1437 block_length -= id_bytes;
1439 if(block_length == 0) {
1443 if(0 == (block->data = (FLAC__byte*)malloc(block_length)))
1444 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1446 if(fread(block->data, 1, block_length, file) != block_length)
1447 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1450 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1453 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_(FILE *file, FLAC__StreamMetadata_SeekTable *block, unsigned block_length)
1456 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1458 FLAC__ASSERT(0 != file);
1459 FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0);
1461 block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1463 if(block->num_points == 0)
1465 else if(0 == (block->points = (FLAC__StreamMetadata_SeekPoint*)malloc(block->num_points * sizeof(FLAC__StreamMetadata_SeekPoint))))
1466 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1468 for(i = 0; i < block->num_points; i++) {
1469 if(fread(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, file) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1470 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1471 /*@@@ some MAGIC NUMBERs here */
1472 block->points[i].sample_number = unpack_uint64_(buffer, 8);
1473 block->points[i].stream_offset = unpack_uint64_(buffer+8, 8);
1474 block->points[i].frame_samples = unpack_uint32_(buffer+16, 2);
1477 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1480 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_(FILE *file, FLAC__StreamMetadata_VorbisComment_Entry *entry)
1482 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1483 FLAC__byte buffer[4]; /* magic number is asserted below */
1485 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8 == 4);
1486 FLAC__ASSERT(0 != file);
1488 if(fread(buffer, 1, entry_length_len, file) != entry_length_len)
1489 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1490 entry->length = unpack_uint32_little_endian_(buffer, entry_length_len);
1492 if(0 != entry->entry)
1495 if(entry->length == 0) {
1499 if(0 == (entry->entry = (FLAC__byte*)malloc(entry->length)))
1500 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1502 if(fread(entry->entry, 1, entry->length, file) != entry->length)
1503 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1506 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1509 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_(FILE *file, FLAC__StreamMetadata_VorbisComment *block)
1512 FLAC__Metadata_SimpleIteratorStatus status;
1513 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
1514 FLAC__byte buffer[4]; /* magic number is asserted below */
1516 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8 == 4);
1517 FLAC__ASSERT(0 != file);
1519 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_(file, &(block->vendor_string))))
1522 if(fread(buffer, 1, num_comments_len, file) != num_comments_len)
1523 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1524 block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len);
1526 if(block->num_comments == 0) {
1527 block->comments = 0;
1529 else if(0 == (block->comments = (FLAC__StreamMetadata_VorbisComment_Entry*)calloc(block->num_comments, sizeof(FLAC__StreamMetadata_VorbisComment_Entry))))
1530 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1532 for(i = 0; i < block->num_comments; i++) {
1533 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_(file, block->comments + i)))
1537 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1540 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_(FILE *file, FLAC__StreamMetadata_CueSheet_Track *track)
1543 FLAC__byte buffer[32]; /* asserted below that this is big enough */
1545 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
1546 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
1547 FLAC__ASSERT(sizeof(buffer) >= (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8);
1549 FLAC__ASSERT(0 != file);
1551 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
1552 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
1553 if(fread(buffer, 1, len, file) != len)
1554 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1555 track->offset = unpack_uint64_(buffer, len);
1557 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
1558 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
1559 if(fread(buffer, 1, len, file) != len)
1560 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1561 track->number = (FLAC__byte)unpack_uint32_(buffer, len);
1563 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
1564 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
1565 if(fread(track->isrc, 1, len, file) != len)
1566 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1568 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) % 8 == 0);
1569 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
1570 if(fread(buffer, 1, len, file) != len)
1571 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1572 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN == 1);
1573 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN == 1);
1574 track->type = buffer[0] >> 7;
1575 track->pre_emphasis = (buffer[0] >> 6) & 1;
1577 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
1578 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
1579 if(fread(buffer, 1, len, file) != len)
1580 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1581 track->num_indices = (FLAC__byte)unpack_uint32_(buffer, len);
1583 if(track->num_indices == 0) {
1586 else if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)calloc(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index))))
1587 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1589 for(i = 0; i < track->num_indices; i++) {
1590 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
1591 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
1592 if(fread(buffer, 1, len, file) != len)
1593 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1594 track->indices[i].offset = unpack_uint64_(buffer, len);
1596 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
1597 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
1598 if(fread(buffer, 1, len, file) != len)
1599 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1600 track->indices[i].number = (FLAC__byte)unpack_uint32_(buffer, len);
1602 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
1603 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
1604 if(fread(buffer, 1, len, file) != len)
1605 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1608 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1611 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_(FILE *file, FLAC__StreamMetadata_CueSheet *block)
1614 FLAC__Metadata_SimpleIteratorStatus status;
1615 FLAC__byte buffer[1024]; /* MSVC needs a constant expression so we put a magic number and assert */
1617 FLAC__ASSERT(0 != file);
1618 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN)/8 <= sizeof(buffer));
1619 FLAC__ASSERT(sizeof(FLAC__uint64) <= sizeof(buffer));
1621 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
1622 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
1623 if(fread(block->media_catalog_number, 1, len, file) != len)
1624 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1626 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
1627 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
1628 if(fread(buffer, 1, len, file) != len)
1629 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1630 block->lead_in = unpack_uint64_(buffer, len);
1632 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
1633 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
1634 if(fread(buffer, 1, len, file) != len)
1635 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1636 block->is_cd = buffer[0]&0x80? true : false;
1638 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
1639 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
1640 if(fread(buffer, 1, len, file) != len)
1641 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1642 block->num_tracks = unpack_uint32_(buffer, len);
1644 if(block->num_tracks == 0) {
1647 else if(0 == (block->tracks = (FLAC__StreamMetadata_CueSheet_Track*)calloc(block->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track))))
1648 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1650 for(i = 0; i < block->num_tracks; i++) {
1651 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_cuesheet_track_(file, block->tracks + i)))
1655 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1658 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_(FILE *file, FLAC__StreamMetadata_Unknown *block, unsigned block_length)
1660 FLAC__ASSERT(0 != file);
1662 if(block_length == 0) {
1666 if(0 == (block->data = (FLAC__byte*)malloc(block_length)))
1667 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1669 if(fread(block->data, 1, block_length, file) != block_length)
1670 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1673 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1676 FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
1678 FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH];
1680 FLAC__ASSERT(0 != file);
1681 FLAC__ASSERT(0 != status);
1682 FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
1684 buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type;
1685 pack_uint32_(block->length, buffer + 1, 3);
1687 if(local__fwrite(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, file) != FLAC__STREAM_METADATA_HEADER_LENGTH) {
1688 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1695 FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
1697 FLAC__ASSERT(0 != file);
1698 FLAC__ASSERT(0 != status);
1700 switch(block->type) {
1701 case FLAC__METADATA_TYPE_STREAMINFO:
1702 *status = write_metadata_block_data_streaminfo_(file, &block->data.stream_info);
1704 case FLAC__METADATA_TYPE_PADDING:
1705 *status = write_metadata_block_data_padding_(file, &block->data.padding, block->length);
1707 case FLAC__METADATA_TYPE_APPLICATION:
1708 *status = write_metadata_block_data_application_(file, &block->data.application, block->length);
1710 case FLAC__METADATA_TYPE_SEEKTABLE:
1711 *status = write_metadata_block_data_seektable_(file, &block->data.seek_table);
1713 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1714 *status = write_metadata_block_data_vorbis_comment_(file, &block->data.vorbis_comment);
1716 case FLAC__METADATA_TYPE_CUESHEET:
1717 *status = write_metadata_block_data_cuesheet_(file, &block->data.cue_sheet);
1720 *status = write_metadata_block_data_unknown_(file, &block->data.unknown, block->length);
1723 return (*status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1726 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_streaminfo_(FILE *file, const FLAC__StreamMetadata_StreamInfo *block)
1728 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH];
1729 const unsigned channels1 = block->channels - 1;
1730 const unsigned bps1 = block->bits_per_sample - 1;
1732 FLAC__ASSERT(0 != file);
1734 /* @@@ we are using hardcoded numbers for simplicity but we should
1735 * probably eventually write a bit-level packer and use the
1736 * _STREAMINFO_ constants.
1738 pack_uint32_(block->min_blocksize, buffer, 2);
1739 pack_uint32_(block->max_blocksize, buffer+2, 2);
1740 pack_uint32_(block->min_framesize, buffer+4, 3);
1741 pack_uint32_(block->max_framesize, buffer+7, 3);
1742 buffer[10] = (block->sample_rate >> 12) & 0xff;
1743 buffer[11] = (block->sample_rate >> 4) & 0xff;
1744 buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4);
1745 buffer[13] = (FLAC__byte)(((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f));
1746 pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4);
1747 memcpy(buffer+18, block->md5sum, 16);
1749 if(local__fwrite(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, file) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1750 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1752 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1755 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_padding_(FILE *file, const FLAC__StreamMetadata_Padding *block, unsigned block_length)
1757 unsigned i, n = block_length;
1758 FLAC__byte buffer[1024];
1760 FLAC__ASSERT(0 != file);
1764 memset(buffer, 0, 1024);
1766 for(i = 0; i < n/1024; i++)
1767 if(local__fwrite(buffer, 1, 1024, file) != 1024)
1768 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1772 if(local__fwrite(buffer, 1, n, file) != n)
1773 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1775 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1778 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_application_(FILE *file, const FLAC__StreamMetadata_Application *block, unsigned block_length)
1780 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1782 FLAC__ASSERT(0 != file);
1784 if(local__fwrite(block->id, 1, id_bytes, file) != id_bytes)
1785 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1787 block_length -= id_bytes;
1789 if(local__fwrite(block->data, 1, block_length, file) != block_length)
1790 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1792 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1795 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_seektable_(FILE *file, const FLAC__StreamMetadata_SeekTable *block)
1798 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1800 FLAC__ASSERT(0 != file);
1802 for(i = 0; i < block->num_points; i++) {
1803 /*@@@ some MAGIC NUMBERs here */
1804 pack_uint64_(block->points[i].sample_number, buffer, 8);
1805 pack_uint64_(block->points[i].stream_offset, buffer+8, 8);
1806 pack_uint32_(block->points[i].frame_samples, buffer+16, 2);
1807 if(local__fwrite(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, file) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1808 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1811 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1814 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_vorbis_comment_(FILE *file, const FLAC__StreamMetadata_VorbisComment *block)
1817 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1818 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
1819 FLAC__byte buffer[4]; /* magic number is asserted below */
1821 FLAC__ASSERT(max(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8 == 4);
1822 FLAC__ASSERT(0 != file);
1824 pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len);
1825 if(local__fwrite(buffer, 1, entry_length_len, file) != entry_length_len)
1826 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1827 if(local__fwrite(block->vendor_string.entry, 1, block->vendor_string.length, file) != block->vendor_string.length)
1828 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1830 pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len);
1831 if(local__fwrite(buffer, 1, num_comments_len, file) != num_comments_len)
1832 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1834 for(i = 0; i < block->num_comments; i++) {
1835 pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len);
1836 if(local__fwrite(buffer, 1, entry_length_len, file) != entry_length_len)
1837 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1838 if(local__fwrite(block->comments[i].entry, 1, block->comments[i].length, file) != block->comments[i].length)
1839 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1842 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1845 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_cuesheet_(FILE *file, const FLAC__StreamMetadata_CueSheet *block)
1848 FLAC__byte buffer[1024]; /* asserted below that this is big enough */
1850 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
1851 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN/8);
1852 FLAC__ASSERT(sizeof(buffer) >= (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN)/8);
1853 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
1855 FLAC__ASSERT(0 != file);
1857 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
1858 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
1859 if(local__fwrite(block->media_catalog_number, 1, len, file) != len)
1860 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1862 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
1863 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
1864 pack_uint64_(block->lead_in, buffer, len);
1865 if(local__fwrite(buffer, 1, len, file) != len)
1866 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1868 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
1869 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
1870 memset(buffer, 0, len);
1873 if(local__fwrite(buffer, 1, len, file) != len)
1874 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1876 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
1877 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
1878 pack_uint32_(block->num_tracks, buffer, len);
1879 if(local__fwrite(buffer, 1, len, file) != len)
1880 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1882 for(i = 0; i < block->num_tracks; i++) {
1883 FLAC__StreamMetadata_CueSheet_Track *track = block->tracks + i;
1885 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
1886 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
1887 pack_uint64_(track->offset, buffer, len);
1888 if(local__fwrite(buffer, 1, len, file) != len)
1889 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1891 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
1892 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
1893 pack_uint32_(track->number, buffer, len);
1894 if(local__fwrite(buffer, 1, len, file) != len)
1895 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1897 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
1898 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
1899 if(local__fwrite(track->isrc, 1, len, file) != len)
1900 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1902 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) % 8 == 0);
1903 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
1904 memset(buffer, 0, len);
1905 buffer[0] = (track->type << 7) | (track->pre_emphasis << 6);
1906 if(local__fwrite(buffer, 1, len, file) != len)
1907 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1909 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
1910 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
1911 pack_uint32_(track->num_indices, buffer, len);
1912 if(local__fwrite(buffer, 1, len, file) != len)
1913 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1915 for(j = 0; j < track->num_indices; j++) {
1916 FLAC__StreamMetadata_CueSheet_Index *index = track->indices + j;
1918 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
1919 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
1920 pack_uint64_(index->offset, buffer, len);
1921 if(local__fwrite(buffer, 1, len, file) != len)
1922 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1924 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
1925 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
1926 pack_uint32_(index->number, buffer, len);
1927 if(local__fwrite(buffer, 1, len, file) != len)
1928 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1930 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
1931 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
1932 memset(buffer, 0, len);
1933 if(local__fwrite(buffer, 1, len, file) != len)
1934 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1938 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1941 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_unknown_(FILE *file, const FLAC__StreamMetadata_Unknown *block, unsigned block_length)
1943 FLAC__ASSERT(0 != file);
1945 if(local__fwrite(block->data, 1, block_length, file) != block_length)
1946 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1948 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1951 FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block)
1953 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1954 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1958 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
1961 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
1964 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1965 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1969 return read_metadata_block_header_(iterator);
1972 FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last)
1974 FLAC__StreamMetadata *padding;
1976 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1977 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1981 block->is_last = false;
1983 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
1986 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
1989 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)))
1990 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1992 padding->is_last = padding_is_last;
1993 padding->length = padding_length;
1995 if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) {
1996 FLAC__metadata_object_delete(padding);
2000 if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) {
2001 FLAC__metadata_object_delete(padding);
2005 FLAC__metadata_object_delete(padding);
2007 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2008 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2012 return read_metadata_block_header_(iterator);
2015 FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append)
2019 int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */
2020 long fixup_is_last_flag_offset = -1;
2022 FLAC__ASSERT(0 != block || append == false);
2024 if(iterator->is_last) {
2026 fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */
2027 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2029 else if(0 == block) {
2030 simple_iterator_push_(iterator);
2031 if(!FLAC__metadata_simple_iterator_prev(iterator)) {
2032 (void)simple_iterator_pop_(iterator);
2035 fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */
2036 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2037 if(!simple_iterator_pop_(iterator))
2042 if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append))
2046 if(!write_metadata_block_header_(tempfile, &iterator->status, block)) {
2047 cleanup_tempfile_(&tempfile, &tempfilename);
2051 if(!write_metadata_block_data_(tempfile, &iterator->status, block)) {
2052 cleanup_tempfile_(&tempfile, &tempfilename);
2057 if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0))
2061 return FLAC__metadata_simple_iterator_next(iterator);
2066 FLAC__bool chain_rewrite_chain_(FLAC__Metadata_Chain *chain)
2069 FLAC__Metadata_Node *node;
2070 FLAC__Metadata_SimpleIteratorStatus status;
2072 FLAC__ASSERT(0 != chain);
2073 FLAC__ASSERT(0 != chain->filename);
2074 FLAC__ASSERT(0 != chain->head);
2076 if(0 == (f = fopen(chain->filename, "r+b"))) {
2077 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
2080 if(0 != fseek(f, chain->first_offset, SEEK_SET)) {
2081 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
2085 for(node = chain->head; node; node = node->next) {
2086 if(!write_metadata_block_header_(f, &status, node->data)) {
2087 chain->status = get_equivalent_status_(status);
2090 if(!write_metadata_block_data_(f, &status, node->data)) {
2091 chain->status = get_equivalent_status_(status);
2096 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
2103 FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix)
2107 FLAC__Metadata_SimpleIteratorStatus status;
2108 const FLAC__Metadata_Node *node;
2110 FLAC__ASSERT(0 != chain);
2111 FLAC__ASSERT(0 != chain->filename);
2112 FLAC__ASSERT(0 != chain->head);
2114 /* copy the file prefix (data up to first metadata block */
2115 if(0 == (f = fopen(chain->filename, "rb"))) {
2116 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
2119 if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) {
2120 chain->status = get_equivalent_status_(status);
2121 cleanup_tempfile_(&tempfile, &tempfilename);
2124 if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) {
2125 chain->status = get_equivalent_status_(status);
2126 cleanup_tempfile_(&tempfile, &tempfilename);
2130 /* write the metadata */
2131 for(node = chain->head; node; node = node->next) {
2132 if(!write_metadata_block_header_(tempfile, &status, node->data)) {
2133 chain->status = get_equivalent_status_(status);
2136 if(!write_metadata_block_data_(tempfile, &status, node->data)) {
2137 chain->status = get_equivalent_status_(status);
2141 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
2143 /* copy the file postfix (everything after the metadata) */
2144 if(0 != fseek(f, chain->last_offset, SEEK_SET)) {
2145 cleanup_tempfile_(&tempfile, &tempfilename);
2146 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
2149 if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) {
2150 cleanup_tempfile_(&tempfile, &tempfilename);
2151 chain->status = get_equivalent_status_(status);
2155 /* move the tempfile on top of the original */
2157 if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status))
2163 void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator)
2165 FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH);
2166 iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth];
2170 FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator)
2172 FLAC__ASSERT(iterator->depth > 0);
2174 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2175 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2179 return read_metadata_block_header_(iterator);
2182 unsigned seek_to_first_metadata_block_(FILE *f)
2184 FLAC__byte buffer[4];
2188 FLAC__ASSERT(0 != f);
2189 FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == 4);
2191 /* skip any id3v2 tag */
2193 n = fread(buffer, 1, 4, f);
2199 else if(0 == memcmp(buffer, "ID3", 3)) {
2200 unsigned tag_length = 0;
2202 /* skip to the tag length */
2203 if(fseek(f, 2, SEEK_CUR) < 0)
2206 /* read the length */
2207 for(i = 0; i < 4; i++) {
2208 if(fread(buffer, 1, 1, f) < 1 || buffer[0] & 0x80)
2211 tag_length |= (buffer[0] & 0x7f);
2214 /* skip the rest of the tag */
2215 if(fseek(f, tag_length, SEEK_CUR) < 0)
2218 /* read the stream sync code */
2220 n = fread(buffer, 1, 4, f);
2228 /* check for the fLaC signature */
2229 if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH))
2235 FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append)
2237 const long offset_end = append? iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length : iterator->offset[iterator->depth];
2239 if(0 != fseek(iterator->file, 0, SEEK_SET)) {
2240 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2243 if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) {
2244 cleanup_tempfile_(tempfile, tempfilename);
2247 if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) {
2248 cleanup_tempfile_(tempfile, tempfilename);
2255 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)
2257 long save_offset = iterator->offset[iterator->depth]; /*@@@ 2G limit */
2258 FLAC__ASSERT(0 != *tempfile);
2260 if(0 != fseek(iterator->file, save_offset + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length, SEEK_SET)) {
2261 cleanup_tempfile_(tempfile, tempfilename);
2262 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2265 if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) {
2266 cleanup_tempfile_(tempfile, tempfilename);
2270 if(fixup_is_last_code != 0) {
2272 * if code == 1, it means a block was appended to the end so
2273 * we have to clear the is_last flag of the previous block
2274 * if code == -1, it means the last block was deleted so
2275 * we have to set the is_last flag of the previous block
2277 /*@@@ MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */
2279 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2280 cleanup_tempfile_(tempfile, tempfilename);
2281 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2284 if(fread(&x, 1, 1, *tempfile) != 1) {
2285 cleanup_tempfile_(tempfile, tempfilename);
2286 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2289 if(fixup_is_last_code > 0) {
2290 FLAC__ASSERT(x & 0x80);
2294 FLAC__ASSERT(!(x & 0x80));
2297 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2298 cleanup_tempfile_(tempfile, tempfilename);
2299 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2302 if(local__fwrite(&x, 1, 1, *tempfile) != 1) {
2303 cleanup_tempfile_(tempfile, tempfilename);
2304 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2309 (void)fclose(iterator->file);
2311 if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status))
2314 if(iterator->has_stats)
2315 set_file_stats_(iterator->filename, &iterator->stats);
2317 if(!simple_iterator_prime_input_(iterator, !iterator->is_writable))
2320 while(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length < save_offset)
2321 if(!FLAC__metadata_simple_iterator_next(iterator))
2326 /* move the iterator to it's original block faster by faking a push, then doing a pop_ */
2327 FLAC__ASSERT(iterator->depth == 0);
2328 iterator->offset[0] = save_offset;
2330 return simple_iterator_pop_(iterator);
2334 FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, unsigned bytes/*@@@ 4G limit*/, FLAC__Metadata_SimpleIteratorStatus *status)
2336 FLAC__byte buffer[8192];
2340 n = min(sizeof(buffer), bytes);
2341 if(fread(buffer, 1, n, file) != n) {
2342 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2345 if(local__fwrite(buffer, 1, n, tempfile) != n) {
2346 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2355 FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status)
2357 FLAC__byte buffer[8192];
2360 while(!feof(file)) {
2361 n = fread(buffer, 1, sizeof(buffer), file);
2362 if(n == 0 && !feof(file)) {
2363 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2366 if(n > 0 && local__fwrite(buffer, 1, n, tempfile) != n) {
2367 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2375 FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
2377 static const char *tempfile_suffix = ".metadata_edit";
2378 if(0 == tempfile_path_prefix) {
2379 if(0 == (*tempfilename = (char*)malloc(strlen(filename) + strlen(tempfile_suffix) + 1))) {
2380 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2383 strcpy(*tempfilename, filename);
2384 strcat(*tempfilename, tempfile_suffix);
2387 const char *p = strrchr(filename, '/');
2393 if(0 == (*tempfilename = (char*)malloc(strlen(tempfile_path_prefix) + 1 + strlen(p) + strlen(tempfile_suffix) + 1))) {
2394 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2397 strcpy(*tempfilename, tempfile_path_prefix);
2398 strcat(*tempfilename, "/");
2399 strcat(*tempfilename, p);
2400 strcat(*tempfilename, tempfile_suffix);
2403 if(0 == (*tempfile = fopen(*tempfilename, "w+b"))) {
2404 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
2411 FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
2413 FLAC__ASSERT(0 != filename);
2414 FLAC__ASSERT(0 != tempfile);
2415 FLAC__ASSERT(0 != *tempfile);
2416 FLAC__ASSERT(0 != tempfilename);
2417 FLAC__ASSERT(0 != *tempfilename);
2418 FLAC__ASSERT(0 != status);
2420 (void)fclose(*tempfile);
2423 #if defined _MSC_VER || defined __MINGW32__
2424 if(unlink(filename) < 0) {
2425 cleanup_tempfile_(tempfile, tempfilename);
2426 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR;
2431 /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just rename(): */
2432 if(0 != rename(*tempfilename, filename)) {
2433 cleanup_tempfile_(tempfile, tempfilename);
2434 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR;
2438 cleanup_tempfile_(tempfile, tempfilename);
2443 void cleanup_tempfile_(FILE **tempfile, char **tempfilename)
2445 if(0 != *tempfile) {
2446 (void)fclose(*tempfile);
2450 if(0 != *tempfilename) {
2451 (void)unlink(*tempfilename);
2452 free(*tempfilename);
2457 FLAC__bool get_file_stats_(const char *filename, struct stat *stats)
2459 FLAC__ASSERT(0 != filename);
2460 FLAC__ASSERT(0 != stats);
2461 return (0 == stat(filename, stats));
2464 void set_file_stats_(const char *filename, struct stat *stats)
2466 struct utimbuf srctime;
2468 FLAC__ASSERT(0 != filename);
2469 FLAC__ASSERT(0 != stats);
2471 srctime.actime = stats->st_atime;
2472 srctime.modtime = stats->st_mtime;
2473 (void)chmod(filename, stats->st_mode);
2474 (void)utime(filename, &srctime);
2475 #if !defined _MSC_VER && !defined __MINGW32__
2476 (void)chown(filename, stats->st_uid, -1);
2477 (void)chown(filename, -1, stats->st_gid);
2481 FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status)
2484 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK:
2485 return FLAC__METADATA_CHAIN_STATUS_OK;
2486 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT:
2487 return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT;
2488 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE:
2489 return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
2490 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE:
2491 return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
2492 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE:
2493 return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE;
2494 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA:
2495 return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA;
2496 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR:
2497 return FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
2498 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR:
2499 return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
2500 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR:
2501 return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
2502 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR:
2503 return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR;
2504 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR:
2505 return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR;
2506 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR:
2507 return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
2508 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR:
2510 return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;