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;
132 FLAC__ASSERT(0 != filename);
133 FLAC__ASSERT(0 != streaminfo);
135 decoder = FLAC__file_decoder_new();
140 cd.got_error = false;
141 cd.got_streaminfo = false;
142 cd.streaminfo = streaminfo;
144 FLAC__file_decoder_set_md5_checking(decoder, false);
145 FLAC__file_decoder_set_filename(decoder, filename);
146 FLAC__file_decoder_set_write_callback(decoder, write_callback_);
147 FLAC__file_decoder_set_metadata_callback(decoder, metadata_callback_);
148 FLAC__file_decoder_set_error_callback(decoder, error_callback_);
149 FLAC__file_decoder_set_client_data(decoder, &cd);
151 if(FLAC__file_decoder_init(decoder) != FLAC__FILE_DECODER_OK || cd.got_error) {
152 FLAC__file_decoder_finish(decoder);
153 FLAC__file_decoder_delete(decoder);
157 if(!FLAC__file_decoder_process_metadata(decoder) || cd.got_error) {
158 FLAC__file_decoder_finish(decoder);
159 FLAC__file_decoder_delete(decoder);
163 FLAC__file_decoder_finish(decoder);
164 FLAC__file_decoder_delete(decoder);
166 return !cd.got_error && cd.got_streaminfo;
169 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
171 (void)decoder, (void)frame, (void)buffer, (void)client_data;
173 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
176 void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
178 level0_client_data *cd = (level0_client_data *)client_data;
181 if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO && 0 != cd->streaminfo) {
182 *(cd->streaminfo) = *metadata;
183 cd->got_streaminfo = true;
187 void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
189 level0_client_data *cd = (level0_client_data *)client_data;
192 if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
193 cd->got_error = true;
197 /****************************************************************************
199 * Level 1 implementation
201 ***************************************************************************/
203 #define SIMPLE_ITERATOR_MAX_PUSH_DEPTH (1+4)
204 /* 1 for initial offset, +4 for our own personal use */
206 struct FLAC__Metadata_SimpleIterator {
208 char *filename, *tempfile_path_prefix;
210 FLAC__bool has_stats;
211 FLAC__bool is_writable;
212 FLAC__Metadata_SimpleIteratorStatus status;
213 /*@@@ 2G limits here because of the offset type: */
214 long offset[SIMPLE_ITERATOR_MAX_PUSH_DEPTH];
215 long first_offset; /* this is the offset to the STREAMINFO block */
217 /* this is the metadata block header of the current block we are pointing to: */
219 FLAC__MetadataType type;
223 const char * const FLAC__Metadata_SimpleIteratorStatusString[] = {
224 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK",
225 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT",
226 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE",
227 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE",
228 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE",
229 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA",
230 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR",
231 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR",
232 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR",
233 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR",
234 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR",
235 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR",
236 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR"
240 FLAC__Metadata_SimpleIterator *FLAC__metadata_simple_iterator_new()
242 FLAC__Metadata_SimpleIterator *iterator = malloc(sizeof(FLAC__Metadata_SimpleIterator));
246 iterator->filename = 0;
247 iterator->tempfile_path_prefix = 0;
248 iterator->has_stats = false;
249 iterator->is_writable = false;
250 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
251 iterator->first_offset = iterator->offset[0] = -1;
258 static void simple_iterator_free_guts_(FLAC__Metadata_SimpleIterator *iterator)
260 FLAC__ASSERT(0 != iterator);
262 if(0 != iterator->file) {
263 fclose(iterator->file);
265 if(iterator->has_stats)
266 set_file_stats_(iterator->filename, &iterator->stats);
268 if(0 != iterator->filename) {
269 free(iterator->filename);
270 iterator->filename = 0;
272 if(0 != iterator->tempfile_path_prefix) {
273 free(iterator->tempfile_path_prefix);
274 iterator->tempfile_path_prefix = 0;
278 void FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator *iterator)
280 FLAC__ASSERT(0 != iterator);
282 simple_iterator_free_guts_(iterator);
286 FLAC__Metadata_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator *iterator)
288 FLAC__Metadata_SimpleIteratorStatus status;
290 FLAC__ASSERT(0 != iterator);
292 status = iterator->status;
293 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
297 static FLAC__bool simple_iterator_prime_input_(FLAC__Metadata_SimpleIterator *iterator)
301 FLAC__ASSERT(0 != iterator);
303 iterator->is_writable = false;
305 if(0 == (iterator->file = fopen(iterator->filename, "r+b"))) {
306 #if !defined _MSC_VER && !defined __MINGW32__
307 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
308 if(errno == EACCES) {
310 if(0 == (iterator->file = fopen(iterator->filename, "rb"))) {
311 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
314 #if !defined _MSC_VER && !defined __MINGW32__
317 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
323 iterator->is_writable = true;
326 ret = seek_to_first_metadata_block_(iterator->file);
330 iterator->first_offset = iterator->offset[iterator->depth] = ftell(iterator->file);
331 return read_metadata_block_header_(iterator);
333 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
336 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE;
345 @@@ If we decide to finish implementing this, put this comment back in metadata.h
347 * The 'tempfile_path_prefix' allows you to specify a directory where
348 * tempfiles should go. Remember that if your metadata edits cause the
349 * FLAC file to grow, the entire file will have to be rewritten. If
350 * 'tempfile_path_prefix' is NULL, the temp file will be written in the
351 * same directory as the original FLAC file. This makes replacing the
352 * original with the tempfile fast but requires extra space in the same
353 * partition for the tempfile. If space is a problem, you can pass a
354 * directory name belonging to a different partition in
355 * 'tempfile_path_prefix'. Note that you should use the forward slash
356 * '/' as the directory separator. A trailing slash is not needed; it
357 * will be added automatically.
359 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats, const char *tempfile_path_prefix);
362 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats)
364 const char *tempfile_path_prefix = 0; /*@@@ search for comments near 'rename(...)' for what it will take to finish implementing this */
366 FLAC__ASSERT(0 != iterator);
367 FLAC__ASSERT(0 != filename);
369 simple_iterator_free_guts_(iterator);
371 if(preserve_file_stats)
372 iterator->has_stats = get_file_stats_(filename, &iterator->stats);
374 if(0 == (iterator->filename = strdup(filename))) {
375 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
378 if(0 != tempfile_path_prefix && 0 == (iterator->tempfile_path_prefix = strdup(tempfile_path_prefix))) {
379 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
383 return simple_iterator_prime_input_(iterator);
386 FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator *iterator)
388 FLAC__ASSERT(0 != iterator);
389 FLAC__ASSERT(0 != iterator->file);
391 return iterator->is_writable;
394 FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator *iterator)
396 FLAC__ASSERT(0 != iterator);
397 FLAC__ASSERT(0 != iterator->file);
399 if(iterator->is_last)
402 if(0 != fseek(iterator->file, iterator->length, SEEK_CUR)) {
403 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
407 iterator->offset[iterator->depth] = ftell(iterator->file);
409 return read_metadata_block_header_(iterator);
412 FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator *iterator)
416 FLAC__ASSERT(0 != iterator);
417 FLAC__ASSERT(0 != iterator->file);
419 if(iterator->offset[iterator->depth] == iterator->first_offset)
422 if(0 != fseek(iterator->file, iterator->first_offset, SEEK_SET)) {
423 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
426 this_offset = iterator->first_offset;
427 if(!read_metadata_block_header_(iterator))
430 /* we ignore any error from ftell() and catch it in fseek() */
431 while(ftell(iterator->file) + (long)iterator->length < iterator->offset[iterator->depth]) {
432 if(0 != fseek(iterator->file, iterator->length, SEEK_CUR)) {
433 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
436 this_offset = ftell(iterator->file);
437 if(!read_metadata_block_header_(iterator))
441 iterator->offset[iterator->depth] = this_offset;
446 FLAC__MetadataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator *iterator)
448 FLAC__ASSERT(0 != iterator);
449 FLAC__ASSERT(0 != iterator->file);
451 return iterator->type;
454 FLAC__StreamMetadata *FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator *iterator)
456 FLAC__StreamMetadata *block = FLAC__metadata_object_new(iterator->type);
458 FLAC__ASSERT(0 != iterator);
459 FLAC__ASSERT(0 != iterator->file);
462 block->is_last = iterator->is_last;
463 block->length = iterator->length;
465 if(!read_metadata_block_data_(iterator, block)) {
466 FLAC__metadata_object_delete(block);
470 /* back up to the beginning of the block data to stay consistent */
471 if(0 != fseek(iterator->file, iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH, SEEK_SET)) {
472 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
473 FLAC__metadata_object_delete(block);
478 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
483 FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
485 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth];)
488 FLAC__ASSERT(0 != iterator);
489 FLAC__ASSERT(0 != iterator->file);
491 if(!iterator->is_writable) {
492 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE;
496 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO || block->type == FLAC__METADATA_TYPE_STREAMINFO) {
497 if(iterator->type != block->type) {
498 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
503 block->is_last = iterator->is_last;
505 if(iterator->length == block->length)
506 return write_metadata_block_stationary_(iterator, block);
507 else if(iterator->length > block->length) {
508 if(use_padding && iterator->length >= FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) {
509 ret = write_metadata_block_stationary_with_padding_(iterator, block, iterator->length - FLAC__STREAM_METADATA_HEADER_LENGTH - block->length, block->is_last);
510 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
511 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
515 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
516 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
517 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
521 else /* iterator->length < block->length */ {
522 unsigned padding_leftover = 0;
523 FLAC__bool padding_is_last = false;
525 /* first see if we can even use padding */
526 if(iterator->is_last) {
530 const unsigned extra_padding_bytes_required = block->length - iterator->length;
531 simple_iterator_push_(iterator);
532 if(!FLAC__metadata_simple_iterator_next(iterator)) {
533 (void)simple_iterator_pop_(iterator);
536 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
540 if(FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length == extra_padding_bytes_required) {
541 padding_leftover = 0;
542 block->is_last = iterator->is_last;
544 else if(iterator->length < extra_padding_bytes_required)
547 padding_leftover = FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length - extra_padding_bytes_required;
548 padding_is_last = iterator->is_last;
549 block->is_last = false;
552 if(!simple_iterator_pop_(iterator))
557 if(padding_leftover == 0) {
558 ret = write_metadata_block_stationary_(iterator, block);
559 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
560 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
564 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
565 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
566 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
567 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
572 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
573 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
574 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
580 FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
582 unsigned padding_leftover = 0;
583 FLAC__bool padding_is_last = false;
585 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length;)
588 FLAC__ASSERT(0 != iterator);
589 FLAC__ASSERT(0 != iterator->file);
591 if(!iterator->is_writable)
594 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) {
595 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
599 block->is_last = iterator->is_last;
602 /* first see if we can even use padding */
603 if(iterator->is_last) {
607 simple_iterator_push_(iterator);
608 if(!FLAC__metadata_simple_iterator_next(iterator)) {
609 (void)simple_iterator_pop_(iterator);
612 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
616 if(iterator->length == block->length) {
617 padding_leftover = 0;
618 block->is_last = iterator->is_last;
620 else if(iterator->length < FLAC__STREAM_METADATA_HEADER_LENGTH + block->length)
623 padding_leftover = iterator->length - block->length;
624 padding_is_last = iterator->is_last;
625 block->is_last = false;
628 if(!simple_iterator_pop_(iterator))
633 /* move to the next block, which is suitable padding */
634 if(!FLAC__metadata_simple_iterator_next(iterator))
636 if(padding_leftover == 0) {
637 ret = write_metadata_block_stationary_(iterator, block);
638 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
639 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
643 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
644 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
645 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
646 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
651 ret = rewrite_whole_file_(iterator, block, /*append=*/true);
652 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
653 FLAC__ASSERT(ftell(iterator->file) == debug_target_offset + (long)FLAC__STREAM_METADATA_HEADER_LENGTH);
658 FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool use_padding)
660 FLAC__ASSERT_DECLARATION(long debug_target_offset = iterator->offset[iterator->depth];)
663 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO) {
664 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
669 FLAC__StreamMetadata *padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
671 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
674 padding->length = iterator->length;
675 if(!FLAC__metadata_simple_iterator_set_block(iterator, padding, false)) {
676 FLAC__metadata_object_delete(padding);
679 FLAC__metadata_object_delete(padding);
680 if(!FLAC__metadata_simple_iterator_prev(iterator))
682 FLAC__ASSERT(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length == debug_target_offset);
683 FLAC__ASSERT(ftell(iterator->file) + (long)iterator->length == debug_target_offset);
687 ret = rewrite_whole_file_(iterator, 0, /*append=*/false);
688 FLAC__ASSERT(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length == debug_target_offset);
689 FLAC__ASSERT(ftell(iterator->file) + (long)iterator->length == debug_target_offset);
696 /****************************************************************************
698 * Level 2 implementation
700 ***************************************************************************/
703 typedef struct FLAC__Metadata_Node {
704 FLAC__StreamMetadata *data;
705 struct FLAC__Metadata_Node *prev, *next;
706 } FLAC__Metadata_Node;
708 struct FLAC__Metadata_Chain {
710 FLAC__Metadata_Node *head;
711 FLAC__Metadata_Node *tail;
713 FLAC__Metadata_ChainStatus status;
714 long first_offset, last_offset; /*@@@ 2G limit */
716 * This is the length of the chain initially read from the FLAC file.
717 * it is used to compare against the current length to decide whether
718 * or not the whole file has to be rewritten.
720 unsigned initial_length; /*@@@ 4G limit */
723 struct FLAC__Metadata_Iterator {
724 FLAC__Metadata_Chain *chain;
725 FLAC__Metadata_Node *current;
728 const char * const FLAC__Metadata_ChainStatusString[] = {
729 "FLAC__METADATA_CHAIN_STATUS_OK",
730 "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT",
731 "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE",
732 "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE",
733 "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE",
734 "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA",
735 "FLAC__METADATA_CHAIN_STATUS_READ_ERROR",
736 "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR",
737 "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR",
738 "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR",
739 "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR",
740 "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR",
741 "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR"
745 static FLAC__Metadata_Node *node_new_()
747 FLAC__Metadata_Node *node = (FLAC__Metadata_Node*)malloc(sizeof(FLAC__Metadata_Node));
749 memset(node, 0, sizeof(FLAC__Metadata_Node));
753 static void node_delete_(FLAC__Metadata_Node *node)
755 FLAC__ASSERT(0 != node);
757 FLAC__metadata_object_delete(node->data);
761 static void chain_append_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
763 FLAC__ASSERT(0 != chain);
764 FLAC__ASSERT(0 != node);
765 FLAC__ASSERT(0 != node->data);
767 node->next = node->prev = 0;
768 node->data->is_last = true;
770 chain->tail->data->is_last = false;
775 FLAC__ASSERT(0 != chain->tail);
776 chain->tail->next = node;
777 node->prev = chain->tail;
783 static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
785 FLAC__ASSERT(0 != chain);
786 FLAC__ASSERT(0 != node);
788 if(node == chain->head)
789 chain->head = node->next;
791 node->prev->next = node->next;
793 if(node == chain->tail)
794 chain->tail = node->prev;
796 node->next->prev = node->prev;
799 chain->tail->data->is_last = true;
804 static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
806 chain_remove_node_(chain, node);
810 static unsigned chain_calculate_length_(FLAC__Metadata_Chain *chain)
812 const FLAC__Metadata_Node *node;
814 for(node = chain->head; node; node = node->next)
815 length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
819 static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
821 FLAC__ASSERT(0 != node);
822 FLAC__ASSERT(0 != node->data);
823 FLAC__ASSERT(0 != iterator);
824 FLAC__ASSERT(0 != iterator->current);
825 FLAC__ASSERT(0 != iterator->chain);
826 FLAC__ASSERT(0 != iterator->chain->head);
827 FLAC__ASSERT(0 != iterator->chain->tail);
829 node->data->is_last = false;
831 node->prev = iterator->current->prev;
832 node->next = iterator->current;
835 iterator->chain->head = node;
837 node->prev->next = node;
839 iterator->current->prev = node;
841 iterator->chain->nodes++;
844 static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
846 FLAC__ASSERT(0 != node);
847 FLAC__ASSERT(0 != node->data);
848 FLAC__ASSERT(0 != iterator);
849 FLAC__ASSERT(0 != iterator->current);
850 FLAC__ASSERT(0 != iterator->chain);
851 FLAC__ASSERT(0 != iterator->chain->head);
852 FLAC__ASSERT(0 != iterator->chain->tail);
854 iterator->current->data->is_last = false;
856 node->prev = iterator->current;
857 node->next = iterator->current->next;
860 iterator->chain->tail = node;
862 node->next->prev = node;
864 node->prev->next = node;
866 iterator->chain->tail->data->is_last = true;
868 iterator->chain->nodes++;
871 /* return true iff node and node->next are both padding */
872 static FLAC__bool chain_merge_adjacent_padding_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
874 if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) {
875 const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length;
876 node->data->length += growth;
878 chain_delete_node_(chain, node->next);
885 FLAC__Metadata_Chain *FLAC__metadata_chain_new()
887 FLAC__Metadata_Chain *chain = malloc(sizeof(FLAC__Metadata_Chain));
891 chain->head = chain->tail = 0;
893 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
894 chain->initial_length = 0;
900 void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain)
902 FLAC__Metadata_Node *node, *next;
904 FLAC__ASSERT(0 != chain);
906 for(node = chain->head; node; ) {
912 if(0 != chain->filename)
913 free(chain->filename);
918 FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain)
920 FLAC__Metadata_ChainStatus status;
922 FLAC__ASSERT(0 != chain);
924 status = chain->status;
925 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
929 FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename)
931 FLAC__Metadata_SimpleIterator *iterator;
932 FLAC__Metadata_Node *node;
934 FLAC__ASSERT(0 != chain);
935 FLAC__ASSERT(0 != filename);
937 if(0 == (chain->filename = strdup(filename))) {
938 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
942 if(0 == (iterator = FLAC__metadata_simple_iterator_new())) {
943 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
947 if(!FLAC__metadata_simple_iterator_init(iterator, filename, /*preserve_file_stats=*/false)) {
948 chain->status = get_equivalent_status_(iterator->status);
952 chain->first_offset = iterator->offset[iterator->depth];
957 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
960 node->data = FLAC__metadata_simple_iterator_get_block(iterator);
961 if(0 == node->data) {
963 chain->status = get_equivalent_status_(iterator->status);
966 chain_append_node_(chain, node);
967 } while(FLAC__metadata_simple_iterator_next(iterator));
969 if(!iterator->is_last || iterator->status != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK) {
970 chain->status = get_equivalent_status_(iterator->status);
974 chain->last_offset = ftell(iterator->file) + iterator->length;
975 FLAC__metadata_simple_iterator_delete(iterator);
977 chain->initial_length = chain_calculate_length_(chain);
981 FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats)
984 const char *tempfile_path_prefix = 0;
985 unsigned current_length;
987 FLAC__ASSERT(0 != chain);
989 current_length = chain_calculate_length_(chain);
992 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
993 const unsigned delta = chain->initial_length - current_length;
994 chain->tail->data->length += delta;
995 current_length += delta;
996 FLAC__ASSERT(current_length == chain->initial_length);
998 else if(current_length + FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
999 FLAC__StreamMetadata *padding;
1000 FLAC__Metadata_Node *node;
1001 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) {
1002 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1005 padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + current_length);
1006 if(0 == (node = node_new_())) {
1007 FLAC__metadata_object_delete(padding);
1008 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1011 node->data = padding;
1012 chain_append_node_(chain, node);
1013 current_length = chain_calculate_length_(chain);
1014 FLAC__ASSERT(current_length == chain->initial_length);
1016 else if(current_length > chain->initial_length) {
1017 const unsigned delta = current_length - chain->initial_length;
1018 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1019 if(chain->tail->data->length + FLAC__STREAM_METADATA_HEADER_LENGTH == delta) {
1020 chain_delete_node_(chain, chain->tail);
1021 current_length = chain_calculate_length_(chain);
1022 FLAC__ASSERT(current_length == chain->initial_length);
1024 else if(chain->tail->data->length >= delta) {
1025 chain->tail->data->length -= delta;
1026 current_length -= delta;
1027 FLAC__ASSERT(current_length == chain->initial_length);
1033 if(preserve_file_stats)
1034 get_file_stats_(chain->filename, &stats);
1036 if(current_length == chain->initial_length) {
1037 if(!chain_rewrite_chain_(chain))
1041 if(!chain_rewrite_file_(chain, tempfile_path_prefix))
1045 if(preserve_file_stats)
1046 set_file_stats_(chain->filename, &stats);
1048 /* recompute lengths and offsets if necessary */
1049 if(chain->initial_length != current_length) {
1050 const FLAC__Metadata_Node *node;
1051 chain->initial_length = current_length;
1052 chain->last_offset = chain->first_offset;
1053 for(node = chain->head; node; node = node->next)
1054 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1060 void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain)
1062 FLAC__Metadata_Node *node;
1064 FLAC__ASSERT(0 != chain);
1066 for(node = chain->head; node; ) {
1067 if(!chain_merge_adjacent_padding_(chain, node))
1072 void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain)
1074 FLAC__Metadata_Node *node, *save;
1077 FLAC__ASSERT(0 != chain);
1080 * Don't try and be too smart... this simple algo is good enough for
1081 * the small number of nodes that we deal with.
1083 for(i = 0, node = chain->head; i < chain->nodes; i++) {
1084 if(node->data->type == FLAC__METADATA_TYPE_PADDING) {
1086 chain_remove_node_(chain, node);
1087 chain_append_node_(chain, node);
1095 FLAC__metadata_chain_merge_padding(chain);
1099 FLAC__Metadata_Iterator *FLAC__metadata_iterator_new()
1101 FLAC__Metadata_Iterator *iterator = malloc(sizeof(FLAC__Metadata_Iterator));
1104 iterator->current = 0;
1105 iterator->chain = 0;
1111 void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator)
1113 FLAC__ASSERT(0 != iterator);
1118 void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain)
1120 FLAC__ASSERT(0 != iterator);
1121 FLAC__ASSERT(0 != chain);
1122 FLAC__ASSERT(0 != chain->head);
1124 iterator->chain = chain;
1125 iterator->current = chain->head;
1128 FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator)
1130 FLAC__ASSERT(0 != iterator);
1132 if(0 == iterator->current || 0 == iterator->current->next)
1135 iterator->current = iterator->current->next;
1139 FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator)
1141 FLAC__ASSERT(0 != iterator);
1143 if(0 == iterator->current || 0 == iterator->current->prev)
1146 iterator->current = iterator->current->prev;
1150 FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator)
1152 FLAC__ASSERT(0 != iterator);
1153 FLAC__ASSERT(0 != iterator->current);
1154 FLAC__ASSERT(0 != iterator->current->data);
1156 return iterator->current->data->type;
1159 FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator)
1161 FLAC__ASSERT(0 != iterator);
1162 FLAC__ASSERT(0 != iterator->current);
1164 return iterator->current->data;
1167 FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1169 FLAC__ASSERT(0 != iterator);
1170 FLAC__ASSERT(0 != block);
1171 return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block);
1174 FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding)
1176 FLAC__Metadata_Node *save;
1178 FLAC__ASSERT(0 != iterator);
1179 FLAC__ASSERT(0 != iterator->current);
1181 if(0 == iterator->current->prev) {
1182 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1186 save = iterator->current->prev;
1188 if(replace_with_padding) {
1189 FLAC__metadata_object_delete_data(iterator->current->data);
1190 iterator->current->data->type = FLAC__METADATA_TYPE_PADDING;
1193 chain_delete_node_(iterator->chain, iterator->current);
1196 iterator->current = save;
1200 FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1202 FLAC__Metadata_Node *node;
1204 FLAC__ASSERT(0 != iterator);
1205 FLAC__ASSERT(0 != iterator->current);
1206 FLAC__ASSERT(0 != block);
1208 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1211 if(0 == iterator->current->prev) {
1212 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1216 if(0 == (node = node_new_()))
1220 iterator_insert_node_(iterator, node);
1221 iterator->current = node;
1225 FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1227 FLAC__Metadata_Node *node;
1229 FLAC__ASSERT(0 != iterator);
1230 FLAC__ASSERT(0 != iterator->current);
1231 FLAC__ASSERT(0 != block);
1233 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1236 if(0 == (node = node_new_()))
1240 iterator_insert_node_after_(iterator, node);
1241 iterator->current = node;
1246 /****************************************************************************
1248 * Local function definitions
1250 ***************************************************************************/
1252 void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1258 for(i = 0; i < bytes; i++) {
1259 *(--b) = (FLAC__byte)(val & 0xff);
1264 void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1268 for(i = 0; i < bytes; i++) {
1269 *(b++) = (FLAC__byte)(val & 0xff);
1274 void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes)
1280 for(i = 0; i < bytes; i++) {
1281 *(--b) = (FLAC__byte)(val & 0xff);
1286 FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes)
1288 FLAC__uint32 ret = 0;
1291 for(i = 0; i < bytes; i++)
1292 ret = (ret << 8) | (FLAC__uint32)(*b++);
1297 FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes)
1299 FLAC__uint32 ret = 0;
1304 for(i = 0; i < bytes; i++)
1305 ret = (ret << 8) | (FLAC__uint32)(*--b);
1310 FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes)
1312 FLAC__uint64 ret = 0;
1315 for(i = 0; i < bytes; i++)
1316 ret = (ret << 8) | (FLAC__uint64)(*b++);
1321 FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator)
1323 FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH];
1325 FLAC__ASSERT(0 != iterator);
1326 FLAC__ASSERT(0 != iterator->file);
1328 if(fread(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, iterator->file) != FLAC__STREAM_METADATA_HEADER_LENGTH) {
1329 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1333 iterator->is_last = raw_header[0] & 0x80? true : false;
1334 iterator->type = (FLAC__MetadataType)(raw_header[0] & 0x7f);
1335 iterator->length = unpack_uint32_(raw_header + 1, 3);
1337 /* do some checking */
1338 if(iterator->type > FLAC__METADATA_TYPE_VORBIS_COMMENT) {
1339 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA;
1346 FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block)
1348 FLAC__ASSERT(0 != iterator);
1349 FLAC__ASSERT(0 != iterator->file);
1351 switch(block->type) {
1352 case FLAC__METADATA_TYPE_STREAMINFO:
1353 iterator->status = read_metadata_block_data_streaminfo_(iterator->file, &block->data.stream_info);
1355 case FLAC__METADATA_TYPE_PADDING:
1356 iterator->status = read_metadata_block_data_padding_(iterator->file, &block->data.padding, block->length);
1358 case FLAC__METADATA_TYPE_APPLICATION:
1359 iterator->status = read_metadata_block_data_application_(iterator->file, &block->data.application, block->length);
1361 case FLAC__METADATA_TYPE_SEEKTABLE:
1362 iterator->status = read_metadata_block_data_seektable_(iterator->file, &block->data.seek_table, block->length);
1364 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1365 iterator->status = read_metadata_block_data_vorbis_comment_(iterator->file, &block->data.vorbis_comment);
1369 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR;
1372 return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1375 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_(FILE *file, FLAC__StreamMetadata_StreamInfo *block)
1377 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b;
1379 FLAC__ASSERT(0 != file);
1381 if(fread(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, file) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1382 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1386 /* @@@ we are using hardcoded numbers for simplicity but we should
1387 * probably eventually write a bit-level unpacker and use the
1388 * _STREAMINFO_ constants.
1390 block->min_blocksize = unpack_uint32_(b, 2); b += 2;
1391 block->max_blocksize = unpack_uint32_(b, 2); b += 2;
1392 block->min_framesize = unpack_uint32_(b, 3); b += 3;
1393 block->max_framesize = unpack_uint32_(b, 3); b += 3;
1394 block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4);
1395 block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
1396 block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 1) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1;
1397 block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4);
1398 memcpy(block->md5sum, b+8, 16);
1400 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1404 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_(FILE *file, FLAC__StreamMetadata_Padding *block, unsigned block_length)
1406 FLAC__ASSERT(0 != file);
1408 (void)block; /* nothing to do; we don't care about reading the padding bytes */
1410 if(0 != fseek(file, block_length, SEEK_CUR))
1411 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1413 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1416 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_(FILE *file, FLAC__StreamMetadata_Application *block, unsigned block_length)
1418 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1420 FLAC__ASSERT(0 != file);
1422 if(fread(block->id, 1, id_bytes, file) != id_bytes)
1423 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1425 block_length -= id_bytes;
1427 if(block_length == 0) {
1431 if(0 == (block->data = malloc(block_length)))
1432 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1434 if(fread(block->data, 1, block_length, file) != block_length)
1435 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1438 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1441 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_(FILE *file, FLAC__StreamMetadata_SeekTable *block, unsigned block_length)
1444 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1446 FLAC__ASSERT(0 != file);
1447 FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0);
1449 block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1451 if(block->num_points == 0)
1453 else if(0 == (block->points = malloc(block->num_points * sizeof(FLAC__StreamMetadata_SeekPoint))))
1454 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1456 for(i = 0; i < block->num_points; i++) {
1457 if(fread(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, file) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1458 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1459 /*@@@ some MAGIC NUMBERs here */
1460 block->points[i].sample_number = unpack_uint64_(buffer, 8);
1461 block->points[i].stream_offset = unpack_uint64_(buffer+8, 8);
1462 block->points[i].frame_samples = unpack_uint32_(buffer+16, 2);
1465 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1468 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_(FILE *file, FLAC__StreamMetadata_VorbisComment_Entry *entry)
1470 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1471 FLAC__byte buffer[4]; /* magic number is asserted below */
1473 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8 == 4);
1474 FLAC__ASSERT(0 != file);
1476 if(fread(buffer, 1, entry_length_len, file) != entry_length_len)
1477 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1478 entry->length = unpack_uint32_little_endian_(buffer, entry_length_len);
1480 if(entry->length == 0) {
1484 if(0 == (entry->entry = malloc(entry->length)))
1485 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1487 if(fread(entry->entry, 1, entry->length, file) != entry->length)
1488 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1491 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1494 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_(FILE *file, FLAC__StreamMetadata_VorbisComment *block)
1497 FLAC__Metadata_SimpleIteratorStatus status;
1498 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
1499 FLAC__byte buffer[4]; /* magic number is asserted below */
1501 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8 == 4);
1502 FLAC__ASSERT(0 != file);
1504 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_(file, &(block->vendor_string))))
1507 if(fread(buffer, 1, num_comments_len, file) != num_comments_len)
1508 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1509 block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len);
1511 if(block->num_comments == 0) {
1512 block->comments = 0;
1514 else if(0 == (block->comments = malloc(block->num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry))))
1515 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1517 for(i = 0; i < block->num_comments; i++) {
1518 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_(file, block->comments + i)))
1522 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1525 FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
1527 FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH];
1529 FLAC__ASSERT(0 != file);
1530 FLAC__ASSERT(0 != status);
1531 FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
1533 buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type;
1534 pack_uint32_(block->length, buffer + 1, 3);
1536 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, file) != FLAC__STREAM_METADATA_HEADER_LENGTH) {
1537 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1544 FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
1546 FLAC__ASSERT(0 != file);
1547 FLAC__ASSERT(0 != status);
1549 switch(block->type) {
1550 case FLAC__METADATA_TYPE_STREAMINFO:
1551 *status = write_metadata_block_data_streaminfo_(file, &block->data.stream_info);
1553 case FLAC__METADATA_TYPE_PADDING:
1554 *status = write_metadata_block_data_padding_(file, &block->data.padding, block->length);
1556 case FLAC__METADATA_TYPE_APPLICATION:
1557 *status = write_metadata_block_data_application_(file, &block->data.application, block->length);
1559 case FLAC__METADATA_TYPE_SEEKTABLE:
1560 *status = write_metadata_block_data_seektable_(file, &block->data.seek_table);
1562 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1563 *status = write_metadata_block_data_vorbis_comment_(file, &block->data.vorbis_comment);
1567 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR;
1569 return (*status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1572 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_streaminfo_(FILE *file, const FLAC__StreamMetadata_StreamInfo *block)
1574 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH];
1575 const unsigned channels1 = block->channels - 1;
1576 const unsigned bps1 = block->bits_per_sample - 1;
1578 FLAC__ASSERT(0 != file);
1580 /* @@@ we are using hardcoded numbers for simplicity but we should
1581 * probably eventually write a bit-level packer and use the
1582 * _STREAMINFO_ constants.
1584 pack_uint32_(block->min_blocksize, buffer, 2);
1585 pack_uint32_(block->max_blocksize, buffer+2, 2);
1586 pack_uint32_(block->min_framesize, buffer+4, 3);
1587 pack_uint32_(block->max_framesize, buffer+7, 3);
1588 buffer[10] = (block->sample_rate >> 12) & 0xff;
1589 buffer[11] = (block->sample_rate >> 4) & 0xff;
1590 buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4);
1591 buffer[13] = (FLAC__byte)(((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f));
1592 pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4);
1593 memcpy(buffer+18, block->md5sum, 16);
1595 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, file) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1596 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1598 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1601 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_padding_(FILE *file, const FLAC__StreamMetadata_Padding *block, unsigned block_length)
1603 unsigned i, n = block_length;
1604 FLAC__byte buffer[1024];
1606 FLAC__ASSERT(0 != file);
1610 memset(buffer, 0, 1024);
1612 for(i = 0; i < n/1024; i++)
1613 if(fwrite(buffer, 1, 1024, file) != 1024)
1614 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1618 if(fwrite(buffer, 1, n, file) != n)
1619 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1621 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1624 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_application_(FILE *file, const FLAC__StreamMetadata_Application *block, unsigned block_length)
1626 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1628 FLAC__ASSERT(0 != file);
1630 if(fwrite(block->id, 1, id_bytes, file) != id_bytes)
1631 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1633 block_length -= id_bytes;
1635 if(fwrite(block->data, 1, block_length, file) != block_length)
1636 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1638 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1641 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_seektable_(FILE *file, const FLAC__StreamMetadata_SeekTable *block)
1644 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1646 FLAC__ASSERT(0 != file);
1648 for(i = 0; i < block->num_points; i++) {
1649 /*@@@ some MAGIC NUMBERs here */
1650 pack_uint64_(block->points[i].sample_number, buffer, 8);
1651 pack_uint64_(block->points[i].stream_offset, buffer+8, 8);
1652 pack_uint32_(block->points[i].frame_samples, buffer+16, 2);
1653 if(fwrite(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, file) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1654 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1657 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1660 FLAC__Metadata_SimpleIteratorStatus write_metadata_block_data_vorbis_comment_(FILE *file, const FLAC__StreamMetadata_VorbisComment *block)
1663 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
1664 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
1665 FLAC__byte buffer[4]; /* magic number is asserted below */
1667 FLAC__ASSERT(max(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8 == 4);
1668 FLAC__ASSERT(0 != file);
1670 pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len);
1671 if(fwrite(buffer, 1, entry_length_len, file) != entry_length_len)
1672 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1673 if(fwrite(block->vendor_string.entry, 1, block->vendor_string.length, file) != block->vendor_string.length)
1674 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1676 pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len);
1677 if(fwrite(buffer, 1, num_comments_len, file) != num_comments_len)
1678 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1680 for(i = 0; i < block->num_comments; i++) {
1681 pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len);
1682 if(fwrite(buffer, 1, entry_length_len, file) != entry_length_len)
1683 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1684 if(fwrite(block->comments[i].entry, 1, block->comments[i].length, file) != block->comments[i].length)
1685 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
1688 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1691 FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block)
1693 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1694 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1698 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
1701 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
1704 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1705 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1709 return read_metadata_block_header_(iterator);
1712 FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last)
1714 FLAC__StreamMetadata *padding;
1716 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1717 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1721 block->is_last = false;
1723 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
1726 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
1729 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)))
1730 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1732 padding->is_last = padding_is_last;
1733 padding->length = padding_length;
1735 if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) {
1736 FLAC__metadata_object_delete(padding);
1740 if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) {
1741 FLAC__metadata_object_delete(padding);
1745 FLAC__metadata_object_delete(padding);
1747 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1748 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1752 return read_metadata_block_header_(iterator);
1755 FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append)
1759 int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */
1760 long fixup_is_last_flag_offset = -1;
1762 FLAC__ASSERT(0 != block || append == false);
1764 if(iterator->is_last) {
1766 fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */
1767 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
1769 else if(0 == block) {
1770 simple_iterator_push_(iterator);
1771 if(!FLAC__metadata_simple_iterator_prev(iterator)) {
1772 (void)simple_iterator_pop_(iterator);
1775 fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */
1776 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
1777 if(!simple_iterator_pop_(iterator))
1782 if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append))
1786 if(!write_metadata_block_header_(tempfile, &iterator->status, block)) {
1787 cleanup_tempfile_(&tempfile, &tempfilename);
1791 if(!write_metadata_block_data_(tempfile, &iterator->status, block)) {
1792 cleanup_tempfile_(&tempfile, &tempfilename);
1797 if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0))
1801 return FLAC__metadata_simple_iterator_next(iterator);
1806 FLAC__bool chain_rewrite_chain_(FLAC__Metadata_Chain *chain)
1809 FLAC__Metadata_Node *node;
1810 FLAC__Metadata_SimpleIteratorStatus status;
1812 FLAC__ASSERT(0 != chain);
1813 FLAC__ASSERT(0 != chain->filename);
1814 FLAC__ASSERT(0 != chain->head);
1816 if(0 == (f = fopen(chain->filename, "r+b"))) {
1817 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1820 if(0 != fseek(f, chain->first_offset, SEEK_SET)) {
1821 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1825 for(node = chain->head; node; node = node->next) {
1826 if(!write_metadata_block_header_(f, &status, node->data)) {
1827 chain->status = get_equivalent_status_(status);
1830 if(!write_metadata_block_data_(f, &status, node->data)) {
1831 chain->status = get_equivalent_status_(status);
1836 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1843 FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix)
1847 FLAC__Metadata_SimpleIteratorStatus status;
1848 const FLAC__Metadata_Node *node;
1850 FLAC__ASSERT(0 != chain);
1851 FLAC__ASSERT(0 != chain->filename);
1852 FLAC__ASSERT(0 != chain->head);
1854 /* copy the file prefix (data up to first metadata block */
1855 if(0 == (f = fopen(chain->filename, "rb"))) {
1856 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1859 if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) {
1860 chain->status = get_equivalent_status_(status);
1861 cleanup_tempfile_(&tempfile, &tempfilename);
1864 if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) {
1865 chain->status = get_equivalent_status_(status);
1866 cleanup_tempfile_(&tempfile, &tempfilename);
1870 /* write the metadata */
1871 for(node = chain->head; node; node = node->next) {
1872 if(!write_metadata_block_header_(tempfile, &status, node->data)) {
1873 chain->status = get_equivalent_status_(status);
1876 if(!write_metadata_block_data_(tempfile, &status, node->data)) {
1877 chain->status = get_equivalent_status_(status);
1881 /*FLAC__ASSERT(fflush(), ftell() == chain->last_offset);*/
1883 /* copy the file postfix (everything after the metadata) */
1884 if(0 != fseek(f, chain->last_offset, SEEK_SET)) {
1885 cleanup_tempfile_(&tempfile, &tempfilename);
1886 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1889 if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) {
1890 cleanup_tempfile_(&tempfile, &tempfilename);
1891 chain->status = get_equivalent_status_(status);
1895 /* move the tempfile on top of the original */
1897 if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status))
1903 void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator)
1905 FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH);
1906 iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth];
1910 FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator)
1912 FLAC__ASSERT(iterator->depth > 0);
1914 if(0 != fseek(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
1915 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1919 return read_metadata_block_header_(iterator);
1922 unsigned seek_to_first_metadata_block_(FILE *f)
1924 FLAC__byte buffer[4];
1928 FLAC__ASSERT(0 != f);
1929 FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == 4);
1931 /* skip any id3v2 tag */
1932 #if !defined _MSC_VER && !defined __MINGW32__
1933 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
1936 n = fread(buffer, 1, 4, f);
1937 #if !defined _MSC_VER && !defined __MINGW32__
1938 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
1945 else if(0 == memcmp(buffer, "ID3", 3)) {
1946 unsigned tag_length = 0;
1948 /* skip to the tag length */
1949 if(fseek(f, 2, SEEK_CUR) < 0)
1952 /* read the length */
1953 for(i = 0; i < 4; i++) {
1954 if(fread(buffer, 1, 1, f) < 1 || buffer[0] & 0x80)
1957 tag_length |= (buffer[0] & 0x7f);
1960 /* skip the rest of the tag */
1961 if(fseek(f, tag_length, SEEK_CUR) < 0)
1964 /* read the stream sync code */
1965 #if !defined _MSC_VER && !defined __MINGW32__
1966 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
1969 n = fread(buffer, 1, 4, f);
1970 #if !defined _MSC_VER && !defined __MINGW32__
1971 /*@@@ don't know how to resolve errno without using LIBC.LIB; must use MSVCRT.LIB only for plugins */
1980 /* check for the fLaC signature */
1981 if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH))
1987 FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append)
1989 const long offset_end = append? iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length : iterator->offset[iterator->depth];
1991 if(0 != fseek(iterator->file, 0, SEEK_SET)) {
1992 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1995 if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) {
1996 cleanup_tempfile_(tempfile, tempfilename);
1999 if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) {
2000 cleanup_tempfile_(tempfile, tempfilename);
2007 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)
2009 long save_offset = iterator->offset[iterator->depth]; /*@@@ 2G limit */
2010 FLAC__ASSERT(0 != *tempfile);
2012 if(0 != fseek(iterator->file, save_offset + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length, SEEK_SET)) {
2013 cleanup_tempfile_(tempfile, tempfilename);
2014 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2017 if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) {
2018 cleanup_tempfile_(tempfile, tempfilename);
2022 if(fixup_is_last_code != 0) {
2024 * if code == 1, it means a block was appended to the end so
2025 * we have to clear the is_last flag of the previous block
2026 * if code == -1, it means the last block was deleted so
2027 * we have to set the is_last flag of the previous block
2029 /*@@@ MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */
2031 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2032 cleanup_tempfile_(tempfile, tempfilename);
2033 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2036 if(fread(&x, 1, 1, *tempfile) != 1) {
2037 cleanup_tempfile_(tempfile, tempfilename);
2038 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2041 if(fixup_is_last_code > 0) {
2042 FLAC__ASSERT(x & 0x80);
2046 FLAC__ASSERT(!(x & 0x80));
2049 if(0 != fseek(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2050 cleanup_tempfile_(tempfile, tempfilename);
2051 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2054 if(fwrite(&x, 1, 1, *tempfile) != 1) {
2055 cleanup_tempfile_(tempfile, tempfilename);
2056 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2061 (void)fclose(iterator->file);
2063 if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status))
2066 if(iterator->has_stats)
2067 set_file_stats_(iterator->filename, &iterator->stats);
2069 if(!simple_iterator_prime_input_(iterator))
2072 while(iterator->offset[iterator->depth] + (long)FLAC__STREAM_METADATA_HEADER_LENGTH + (long)iterator->length < save_offset)
2073 if(!FLAC__metadata_simple_iterator_next(iterator))
2078 /* move the iterator to it's original block faster by faking a push, then doing a pop_ */
2079 FLAC__ASSERT(iterator->depth == 0);
2080 iterator->offset[0] = save_offset;
2082 return simple_iterator_pop_(iterator);
2086 FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, unsigned bytes/*@@@ 4G limit*/, FLAC__Metadata_SimpleIteratorStatus *status)
2088 FLAC__byte buffer[8192];
2092 n = min(sizeof(buffer), bytes);
2093 if(fread(buffer, 1, n, file) != n) {
2094 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2097 if(fwrite(buffer, 1, n, tempfile) != n) {
2098 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2107 FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status)
2109 FLAC__byte buffer[8192];
2112 while(!feof(file)) {
2113 n = fread(buffer, 1, sizeof(buffer), file);
2114 if(n == 0 && !feof(file)) {
2115 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2118 if(n > 0 && fwrite(buffer, 1, n, tempfile) != n) {
2119 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2127 FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
2129 static const char *tempfile_suffix = ".metadata_edit";
2130 if(0 == tempfile_path_prefix) {
2131 if(0 == (*tempfilename = malloc(strlen(filename) + strlen(tempfile_suffix) + 1))) {
2132 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2135 strcpy(*tempfilename, filename);
2136 strcat(*tempfilename, tempfile_suffix);
2139 const char *p = strrchr(filename, '/');
2145 if(0 == (*tempfilename = malloc(strlen(tempfile_path_prefix) + 1 + strlen(p) + strlen(tempfile_suffix) + 1))) {
2146 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2149 strcpy(*tempfilename, tempfile_path_prefix);
2150 strcat(*tempfilename, "/");
2151 strcat(*tempfilename, p);
2152 strcat(*tempfilename, tempfile_suffix);
2155 if(0 == (*tempfile = fopen(*tempfilename, "w+b"))) {
2156 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
2163 FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
2165 FLAC__ASSERT(0 != filename);
2166 FLAC__ASSERT(0 != tempfile);
2167 FLAC__ASSERT(0 != *tempfile);
2168 FLAC__ASSERT(0 != tempfilename);
2169 FLAC__ASSERT(0 != *tempfilename);
2170 FLAC__ASSERT(0 != status);
2172 (void)fclose(*tempfile);
2175 #if defined _MSC_VER || defined __MINGW32__
2176 if(unlink(filename) < 0) {
2177 cleanup_tempfile_(tempfile, tempfilename);
2178 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR;
2183 /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just rename(): */
2184 if(0 != rename(*tempfilename, filename)) {
2185 cleanup_tempfile_(tempfile, tempfilename);
2186 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR;
2190 cleanup_tempfile_(tempfile, tempfilename);
2195 void cleanup_tempfile_(FILE **tempfile, char **tempfilename)
2197 if(0 != *tempfile) {
2198 (void)fclose(*tempfile);
2202 if(0 != *tempfilename) {
2203 (void)unlink(*tempfilename);
2204 free(*tempfilename);
2209 FLAC__bool get_file_stats_(const char *filename, struct stat *stats)
2211 FLAC__ASSERT(0 != filename);
2212 FLAC__ASSERT(0 != stats);
2213 return (0 == stat(filename, stats));
2216 void set_file_stats_(const char *filename, struct stat *stats)
2218 struct utimbuf srctime;
2220 FLAC__ASSERT(0 != filename);
2221 FLAC__ASSERT(0 != stats);
2223 srctime.actime = stats->st_atime;
2224 srctime.modtime = stats->st_mtime;
2225 (void)chmod(filename, stats->st_mode);
2226 (void)utime(filename, &srctime);
2227 #if !defined _MSC_VER && !defined __MINGW32__
2228 (void)chown(filename, stats->st_uid, -1);
2229 (void)chown(filename, -1, stats->st_gid);
2233 FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status)
2236 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK:
2237 return FLAC__METADATA_CHAIN_STATUS_OK;
2238 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT:
2239 return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT;
2240 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE:
2241 return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
2242 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE:
2243 return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
2244 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE:
2245 return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE;
2246 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA:
2247 return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA;
2248 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR:
2249 return FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
2250 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR:
2251 return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
2252 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR:
2253 return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
2254 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR:
2255 return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR;
2256 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR:
2257 return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR;
2258 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR:
2259 return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
2260 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR:
2262 return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;