1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2001,2002,2003,2004,2005,2006 Josh Coalson
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * - Neither the name of the Xiph.org Foundation nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
41 #if defined _MSC_VER || defined __MINGW32__
42 #include <sys/utime.h> /* for utime() */
43 #include <io.h> /* for chmod() */
44 #include <sys/types.h> /* for off_t */
45 #if _MSC_VER <= 1200 /* @@@ [2G limit] */
50 #include <sys/types.h> /* some flavors of BSD (like OS X) require this to get time_t */
51 #include <utime.h> /* for utime() */
52 #include <unistd.h> /* for chown(), unlink() */
54 #include <sys/stat.h> /* for stat(), maybe chmod() */
56 #include "private/metadata.h"
58 #include "FLAC/assert.h"
59 #include "FLAC/stream_decoder.h"
64 #define max(a,b) ((a)>(b)?(a):(b))
68 #define min(a,b) ((a)<(b)?(a):(b))
71 /****************************************************************************
73 * Local function declarations
75 ***************************************************************************/
77 static void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
78 static void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
79 static void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes);
80 static FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes);
81 static FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes);
82 static FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes);
84 static FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator);
85 static FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block);
86 static FLAC__bool read_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__bool *is_last, FLAC__MetadataType *type, unsigned *length);
87 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata *block);
88 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block);
89 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_Padding *block, unsigned block_length);
90 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, unsigned block_length);
91 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, unsigned block_length);
92 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment_Entry *entry);
93 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment *block);
94 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track);
95 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block);
96 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Picture *block);
97 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, unsigned block_length);
99 static FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
100 static FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
101 static FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block);
102 static FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block);
103 static FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block);
104 static FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, unsigned block_length);
105 static FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, unsigned block_length);
106 static FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block);
107 static FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block);
108 static FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block);
109 static FLAC__bool write_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Picture *block);
110 static FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, unsigned block_length);
112 static FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block);
113 static FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last);
114 static FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append);
116 static void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator);
117 static FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator);
119 static unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb);
120 static unsigned seek_to_first_metadata_block_(FILE *f);
122 static FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append);
123 static FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, off_t fixup_is_last_flag_offset, FLAC__bool backup);
125 static FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status);
126 static FLAC__bool copy_n_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status);
127 static FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status);
128 static FLAC__bool copy_remaining_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Eof eof_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__Metadata_SimpleIteratorStatus *status);
130 static FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
131 static FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
132 static void cleanup_tempfile_(FILE **tempfile, char **tempfilename);
134 static FLAC__bool get_file_stats_(const char *filename, struct stat *stats);
135 static void set_file_stats_(const char *filename, struct stat *stats);
137 static int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence);
138 static FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle);
140 static FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status);
143 #ifdef FLAC__VALGRIND_TESTING
144 static size_t local__fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
146 size_t ret = fwrite(ptr, size, nmemb, stream);
152 #define local__fwrite fwrite
155 /****************************************************************************
157 * Level 0 implementation
159 ***************************************************************************/
161 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
162 static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
163 static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
166 FLAC__bool got_error;
167 FLAC__StreamMetadata *object;
168 } level0_client_data;
170 static FLAC__StreamMetadata *get_one_metadata_block_(const char *filename, FLAC__MetadataType type)
172 level0_client_data cd;
173 FLAC__StreamDecoder *decoder;
175 FLAC__ASSERT(0 != filename);
177 cd.got_error = false;
180 decoder = FLAC__stream_decoder_new();
185 FLAC__stream_decoder_set_md5_checking(decoder, false);
186 FLAC__stream_decoder_set_metadata_ignore_all(decoder);
187 FLAC__stream_decoder_set_metadata_respond(decoder, type);
189 if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, metadata_callback_, error_callback_, &cd) != FLAC__STREAM_DECODER_INIT_STATUS_OK || cd.got_error) {
190 FLAC__stream_decoder_finish(decoder);
191 FLAC__stream_decoder_delete(decoder);
195 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder) || cd.got_error) {
196 FLAC__stream_decoder_finish(decoder);
197 FLAC__stream_decoder_delete(decoder);
199 FLAC__metadata_object_delete(cd.object);
203 FLAC__stream_decoder_finish(decoder);
204 FLAC__stream_decoder_delete(decoder);
209 FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo)
211 FLAC__StreamMetadata *object;
213 FLAC__ASSERT(0 != filename);
214 FLAC__ASSERT(0 != streaminfo);
216 object = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_STREAMINFO);
219 /* can just copy the contents since STREAMINFO has no internal structure */
220 *streaminfo = *object;
221 FLAC__metadata_object_delete(object);
229 FLAC_API FLAC__bool FLAC__metadata_get_tags(const char *filename, FLAC__StreamMetadata **tags)
231 FLAC__ASSERT(0 != filename);
232 FLAC__ASSERT(0 != tags);
234 *tags = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_VORBIS_COMMENT);
239 FLAC_API FLAC__bool FLAC__metadata_get_cuesheet(const char *filename, FLAC__StreamMetadata **cuesheet)
241 FLAC__ASSERT(0 != filename);
242 FLAC__ASSERT(0 != cuesheet);
244 *cuesheet = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_CUESHEET);
246 return 0 != *cuesheet;
249 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
251 (void)decoder, (void)frame, (void)buffer, (void)client_data;
253 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
256 void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
258 level0_client_data *cd = (level0_client_data *)client_data;
262 * we assume we only get here when the one metadata block we were
263 * looking for was passed to us
265 if(!cd->got_error && 0 == cd->object) {
266 if(0 == (cd->object = FLAC__metadata_object_clone(metadata)))
267 cd->got_error = true;
271 void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
273 level0_client_data *cd = (level0_client_data *)client_data;
276 if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
277 cd->got_error = true;
280 FLAC_API FLAC__bool FLAC__metadata_get_picture(const char *filename, FLAC__StreamMetadata **picture, FLAC__StreamMetadata_Picture_Type type, const char *mime_type, const FLAC__byte *description, unsigned max_width, unsigned max_height, unsigned max_depth, unsigned max_colors)
282 FLAC__Metadata_SimpleIterator *it;
283 FLAC__uint64 max_area_seen = 0;
284 FLAC__uint64 max_depth_seen = 0;
286 FLAC__ASSERT(0 != filename);
287 FLAC__ASSERT(0 != picture);
291 it = FLAC__metadata_simple_iterator_new();
294 if(!FLAC__metadata_simple_iterator_init(it, filename, /*read_only=*/true, /*preserve_file_stats=*/true)) {
295 FLAC__metadata_simple_iterator_delete(it);
299 if(FLAC__metadata_simple_iterator_get_block_type(it) == FLAC__METADATA_TYPE_PICTURE) {
300 FLAC__StreamMetadata *obj = FLAC__metadata_simple_iterator_get_block(it);
301 FLAC__uint64 area = (FLAC__uint64)obj->data.picture.width * (FLAC__uint64)obj->data.picture.height;
302 /* check constraints */
304 (type == (FLAC__StreamMetadata_Picture_Type)(-1) || type == obj->data.picture.type) &&
305 (mime_type == 0 || !strcmp(mime_type, obj->data.picture.mime_type)) &&
306 (description == 0 || !strcmp((const char *)description, (const char *)obj->data.picture.description)) &&
307 obj->data.picture.width <= max_width &&
308 obj->data.picture.height <= max_height &&
309 obj->data.picture.depth <= max_depth &&
310 obj->data.picture.colors <= max_colors &&
311 (area > max_area_seen || (area == max_area_seen && obj->data.picture.depth > max_depth_seen))
314 FLAC__metadata_object_delete(*picture);
316 max_area_seen = area;
317 max_depth_seen = obj->data.picture.depth;
320 FLAC__metadata_object_delete(obj);
323 } while(FLAC__metadata_simple_iterator_next(it));
325 FLAC__metadata_simple_iterator_delete(it);
327 return (0 != *picture);
331 /****************************************************************************
333 * Level 1 implementation
335 ***************************************************************************/
337 #define SIMPLE_ITERATOR_MAX_PUSH_DEPTH (1+4)
338 /* 1 for initial offset, +4 for our own personal use */
340 struct FLAC__Metadata_SimpleIterator {
342 char *filename, *tempfile_path_prefix;
344 FLAC__bool has_stats;
345 FLAC__bool is_writable;
346 FLAC__Metadata_SimpleIteratorStatus status;
347 off_t offset[SIMPLE_ITERATOR_MAX_PUSH_DEPTH];
348 off_t first_offset; /* this is the offset to the STREAMINFO block */
350 /* this is the metadata block header of the current block we are pointing to: */
352 FLAC__MetadataType type;
356 FLAC_API const char * const FLAC__Metadata_SimpleIteratorStatusString[] = {
357 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK",
358 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT",
359 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE",
360 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE",
361 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE",
362 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA",
363 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR",
364 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR",
365 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR",
366 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR",
367 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR",
368 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR",
369 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR"
373 FLAC_API FLAC__Metadata_SimpleIterator *FLAC__metadata_simple_iterator_new()
375 FLAC__Metadata_SimpleIterator *iterator = (FLAC__Metadata_SimpleIterator*)calloc(1, sizeof(FLAC__Metadata_SimpleIterator));
379 iterator->filename = 0;
380 iterator->tempfile_path_prefix = 0;
381 iterator->has_stats = false;
382 iterator->is_writable = false;
383 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
384 iterator->first_offset = iterator->offset[0] = -1;
391 static void simple_iterator_free_guts_(FLAC__Metadata_SimpleIterator *iterator)
393 FLAC__ASSERT(0 != iterator);
395 if(0 != iterator->file) {
396 fclose(iterator->file);
398 if(iterator->has_stats)
399 set_file_stats_(iterator->filename, &iterator->stats);
401 if(0 != iterator->filename) {
402 free(iterator->filename);
403 iterator->filename = 0;
405 if(0 != iterator->tempfile_path_prefix) {
406 free(iterator->tempfile_path_prefix);
407 iterator->tempfile_path_prefix = 0;
411 FLAC_API void FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator *iterator)
413 FLAC__ASSERT(0 != iterator);
415 simple_iterator_free_guts_(iterator);
419 FLAC_API FLAC__Metadata_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator *iterator)
421 FLAC__Metadata_SimpleIteratorStatus status;
423 FLAC__ASSERT(0 != iterator);
425 status = iterator->status;
426 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
430 static FLAC__bool simple_iterator_prime_input_(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool read_only)
434 FLAC__ASSERT(0 != iterator);
436 if(read_only || 0 == (iterator->file = fopen(iterator->filename, "r+b"))) {
437 iterator->is_writable = false;
438 if(read_only || errno == EACCES) {
439 if(0 == (iterator->file = fopen(iterator->filename, "rb"))) {
440 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
445 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
450 iterator->is_writable = true;
453 ret = seek_to_first_metadata_block_(iterator->file);
457 iterator->first_offset = iterator->offset[iterator->depth] = ftello(iterator->file);
458 return read_metadata_block_header_(iterator);
460 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
463 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
466 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE;
475 @@@ If we decide to finish implementing this, put this comment back in metadata.h
477 * The 'tempfile_path_prefix' allows you to specify a directory where
478 * tempfiles should go. Remember that if your metadata edits cause the
479 * FLAC file to grow, the entire file will have to be rewritten. If
480 * 'tempfile_path_prefix' is NULL, the temp file will be written in the
481 * same directory as the original FLAC file. This makes replacing the
482 * original with the tempfile fast but requires extra space in the same
483 * partition for the tempfile. If space is a problem, you can pass a
484 * directory name belonging to a different partition in
485 * 'tempfile_path_prefix'. Note that you should use the forward slash
486 * '/' as the directory separator. A trailing slash is not needed; it
487 * will be added automatically.
489 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats, const char *tempfile_path_prefix);
492 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)
494 const char *tempfile_path_prefix = 0; /*@@@ search for comments near 'rename(...)' for what it will take to finish implementing this */
496 FLAC__ASSERT(0 != iterator);
497 FLAC__ASSERT(0 != filename);
499 simple_iterator_free_guts_(iterator);
501 if(!read_only && preserve_file_stats)
502 iterator->has_stats = get_file_stats_(filename, &iterator->stats);
504 if(0 == (iterator->filename = strdup(filename))) {
505 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
508 if(0 != tempfile_path_prefix && 0 == (iterator->tempfile_path_prefix = strdup(tempfile_path_prefix))) {
509 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
513 return simple_iterator_prime_input_(iterator, read_only);
516 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator *iterator)
518 FLAC__ASSERT(0 != iterator);
519 FLAC__ASSERT(0 != iterator->file);
521 return iterator->is_writable;
524 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator *iterator)
526 FLAC__ASSERT(0 != iterator);
527 FLAC__ASSERT(0 != iterator->file);
529 if(iterator->is_last)
532 if(0 != fseeko(iterator->file, iterator->length, SEEK_CUR)) {
533 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
537 iterator->offset[iterator->depth] = ftello(iterator->file);
539 return read_metadata_block_header_(iterator);
542 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator *iterator)
546 FLAC__ASSERT(0 != iterator);
547 FLAC__ASSERT(0 != iterator->file);
549 if(iterator->offset[iterator->depth] == iterator->first_offset)
552 if(0 != fseeko(iterator->file, iterator->first_offset, SEEK_SET)) {
553 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
556 this_offset = iterator->first_offset;
557 if(!read_metadata_block_header_(iterator))
560 /* we ignore any error from ftello() and catch it in fseeko() */
561 while(ftello(iterator->file) + (off_t)iterator->length < iterator->offset[iterator->depth]) {
562 if(0 != fseeko(iterator->file, iterator->length, SEEK_CUR)) {
563 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
566 this_offset = ftello(iterator->file);
567 if(!read_metadata_block_header_(iterator))
571 iterator->offset[iterator->depth] = this_offset;
576 FLAC_API FLAC__MetadataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator *iterator)
578 FLAC__ASSERT(0 != iterator);
579 FLAC__ASSERT(0 != iterator->file);
581 return iterator->type;
584 FLAC_API FLAC__StreamMetadata *FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator *iterator)
586 FLAC__StreamMetadata *block = FLAC__metadata_object_new(iterator->type);
588 FLAC__ASSERT(0 != iterator);
589 FLAC__ASSERT(0 != iterator->file);
592 block->is_last = iterator->is_last;
593 block->length = iterator->length;
595 if(!read_metadata_block_data_(iterator, block)) {
596 FLAC__metadata_object_delete(block);
600 /* back up to the beginning of the block data to stay consistent */
601 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH, SEEK_SET)) {
602 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
603 FLAC__metadata_object_delete(block);
608 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
613 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
615 FLAC__ASSERT_DECLARATION(off_t debug_target_offset = iterator->offset[iterator->depth];)
618 FLAC__ASSERT(0 != iterator);
619 FLAC__ASSERT(0 != iterator->file);
620 FLAC__ASSERT(0 != block);
622 if(!iterator->is_writable) {
623 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE;
627 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO || block->type == FLAC__METADATA_TYPE_STREAMINFO) {
628 if(iterator->type != block->type) {
629 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
634 block->is_last = iterator->is_last;
636 if(iterator->length == block->length)
637 return write_metadata_block_stationary_(iterator, block);
638 else if(iterator->length > block->length) {
639 if(use_padding && iterator->length >= FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) {
640 ret = write_metadata_block_stationary_with_padding_(iterator, block, iterator->length - FLAC__STREAM_METADATA_HEADER_LENGTH - block->length, block->is_last);
641 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
642 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
646 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
647 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
648 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
652 else /* iterator->length < block->length */ {
653 unsigned padding_leftover = 0;
654 FLAC__bool padding_is_last = false;
656 /* first see if we can even use padding */
657 if(iterator->is_last) {
661 const unsigned extra_padding_bytes_required = block->length - iterator->length;
662 simple_iterator_push_(iterator);
663 if(!FLAC__metadata_simple_iterator_next(iterator)) {
664 (void)simple_iterator_pop_(iterator);
667 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
671 if(FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length == extra_padding_bytes_required) {
672 padding_leftover = 0;
673 block->is_last = iterator->is_last;
675 else if(iterator->length < extra_padding_bytes_required)
678 padding_leftover = FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length - extra_padding_bytes_required;
679 padding_is_last = iterator->is_last;
680 block->is_last = false;
683 if(!simple_iterator_pop_(iterator))
688 if(padding_leftover == 0) {
689 ret = write_metadata_block_stationary_(iterator, block);
690 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
691 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
695 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
696 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
697 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
698 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
703 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
704 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
705 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
711 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
713 unsigned padding_leftover = 0;
714 FLAC__bool padding_is_last = false;
716 FLAC__ASSERT_DECLARATION(off_t debug_target_offset = iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length;)
719 FLAC__ASSERT(0 != iterator);
720 FLAC__ASSERT(0 != iterator->file);
721 FLAC__ASSERT(0 != block);
723 if(!iterator->is_writable)
726 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) {
727 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
731 block->is_last = iterator->is_last;
734 /* first see if we can even use padding */
735 if(iterator->is_last) {
739 simple_iterator_push_(iterator);
740 if(!FLAC__metadata_simple_iterator_next(iterator)) {
741 (void)simple_iterator_pop_(iterator);
744 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
748 if(iterator->length == block->length) {
749 padding_leftover = 0;
750 block->is_last = iterator->is_last;
752 else if(iterator->length < FLAC__STREAM_METADATA_HEADER_LENGTH + block->length)
755 padding_leftover = iterator->length - block->length;
756 padding_is_last = iterator->is_last;
757 block->is_last = false;
760 if(!simple_iterator_pop_(iterator))
765 /* move to the next block, which is suitable padding */
766 if(!FLAC__metadata_simple_iterator_next(iterator))
768 if(padding_leftover == 0) {
769 ret = write_metadata_block_stationary_(iterator, block);
770 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
771 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
775 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
776 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
777 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
778 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
783 ret = rewrite_whole_file_(iterator, block, /*append=*/true);
784 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
785 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
790 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool use_padding)
792 FLAC__ASSERT_DECLARATION(off_t debug_target_offset = iterator->offset[iterator->depth];)
795 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO) {
796 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
801 FLAC__StreamMetadata *padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
803 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
806 padding->length = iterator->length;
807 if(!FLAC__metadata_simple_iterator_set_block(iterator, padding, false)) {
808 FLAC__metadata_object_delete(padding);
811 FLAC__metadata_object_delete(padding);
812 if(!FLAC__metadata_simple_iterator_prev(iterator))
814 FLAC__ASSERT(iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length == debug_target_offset);
815 FLAC__ASSERT(ftello(iterator->file) + (off_t)iterator->length == debug_target_offset);
819 ret = rewrite_whole_file_(iterator, 0, /*append=*/false);
820 FLAC__ASSERT(iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length == debug_target_offset);
821 FLAC__ASSERT(ftello(iterator->file) + (off_t)iterator->length == debug_target_offset);
828 /****************************************************************************
830 * Level 2 implementation
832 ***************************************************************************/
835 typedef struct FLAC__Metadata_Node {
836 FLAC__StreamMetadata *data;
837 struct FLAC__Metadata_Node *prev, *next;
838 } FLAC__Metadata_Node;
840 struct FLAC__Metadata_Chain {
841 char *filename; /* will be NULL if using callbacks */
842 FLAC__Metadata_Node *head;
843 FLAC__Metadata_Node *tail;
845 FLAC__Metadata_ChainStatus status;
846 off_t first_offset, last_offset;
848 * This is the length of the chain initially read from the FLAC file.
849 * it is used to compare against the current length to decide whether
850 * or not the whole file has to be rewritten.
852 off_t initial_length;
855 struct FLAC__Metadata_Iterator {
856 FLAC__Metadata_Chain *chain;
857 FLAC__Metadata_Node *current;
860 FLAC_API const char * const FLAC__Metadata_ChainStatusString[] = {
861 "FLAC__METADATA_CHAIN_STATUS_OK",
862 "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT",
863 "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE",
864 "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE",
865 "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE",
866 "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA",
867 "FLAC__METADATA_CHAIN_STATUS_READ_ERROR",
868 "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR",
869 "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR",
870 "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR",
871 "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR",
872 "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR",
873 "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR",
874 "FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS",
875 "FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH",
876 "FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL"
880 static FLAC__Metadata_Node *node_new_()
882 return (FLAC__Metadata_Node*)calloc(1, sizeof(FLAC__Metadata_Node));
885 static void node_delete_(FLAC__Metadata_Node *node)
887 FLAC__ASSERT(0 != node);
889 FLAC__metadata_object_delete(node->data);
893 static void chain_init_(FLAC__Metadata_Chain *chain)
895 FLAC__ASSERT(0 != chain);
898 chain->head = chain->tail = 0;
900 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
901 chain->initial_length = 0;
904 static void chain_clear_(FLAC__Metadata_Chain *chain)
906 FLAC__Metadata_Node *node, *next;
908 FLAC__ASSERT(0 != chain);
910 for(node = chain->head; node; ) {
916 if(0 != chain->filename)
917 free(chain->filename);
922 static void chain_append_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
924 FLAC__ASSERT(0 != chain);
925 FLAC__ASSERT(0 != node);
926 FLAC__ASSERT(0 != node->data);
928 node->next = node->prev = 0;
929 node->data->is_last = true;
931 chain->tail->data->is_last = false;
936 FLAC__ASSERT(0 != chain->tail);
937 chain->tail->next = node;
938 node->prev = chain->tail;
944 static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
946 FLAC__ASSERT(0 != chain);
947 FLAC__ASSERT(0 != node);
949 if(node == chain->head)
950 chain->head = node->next;
952 node->prev->next = node->next;
954 if(node == chain->tail)
955 chain->tail = node->prev;
957 node->next->prev = node->prev;
960 chain->tail->data->is_last = true;
965 static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
967 chain_remove_node_(chain, node);
971 static off_t chain_calculate_length_(FLAC__Metadata_Chain *chain)
973 const FLAC__Metadata_Node *node;
975 for(node = chain->head; node; node = node->next)
976 length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
980 static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
982 FLAC__ASSERT(0 != node);
983 FLAC__ASSERT(0 != node->data);
984 FLAC__ASSERT(0 != iterator);
985 FLAC__ASSERT(0 != iterator->current);
986 FLAC__ASSERT(0 != iterator->chain);
987 FLAC__ASSERT(0 != iterator->chain->head);
988 FLAC__ASSERT(0 != iterator->chain->tail);
990 node->data->is_last = false;
992 node->prev = iterator->current->prev;
993 node->next = iterator->current;
996 iterator->chain->head = node;
998 node->prev->next = node;
1000 iterator->current->prev = node;
1002 iterator->chain->nodes++;
1005 static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
1007 FLAC__ASSERT(0 != node);
1008 FLAC__ASSERT(0 != node->data);
1009 FLAC__ASSERT(0 != iterator);
1010 FLAC__ASSERT(0 != iterator->current);
1011 FLAC__ASSERT(0 != iterator->chain);
1012 FLAC__ASSERT(0 != iterator->chain->head);
1013 FLAC__ASSERT(0 != iterator->chain->tail);
1015 iterator->current->data->is_last = false;
1017 node->prev = iterator->current;
1018 node->next = iterator->current->next;
1021 iterator->chain->tail = node;
1023 node->next->prev = node;
1025 node->prev->next = node;
1027 iterator->chain->tail->data->is_last = true;
1029 iterator->chain->nodes++;
1032 /* return true iff node and node->next are both padding */
1033 static FLAC__bool chain_merge_adjacent_padding_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
1035 if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) {
1036 const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length;
1037 node->data->length += growth;
1039 chain_delete_node_(chain, node->next);
1046 /* Returns the new length of the chain, or 0 if there was an error. */
1047 /* WATCHOUT: This can get called multiple times before a write, so
1048 * it should still work when this happens.
1050 /* WATCHOUT: Make sure to also update the logic in
1051 * FLAC__metadata_chain_check_if_tempfile_needed() if the logic here changes.
1053 static off_t chain_prepare_for_write_(FLAC__Metadata_Chain *chain, FLAC__bool use_padding)
1055 off_t current_length = chain_calculate_length_(chain);
1058 /* if the metadata shrank and the last block is padding, we just extend the last padding block */
1059 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1060 const off_t delta = chain->initial_length - current_length;
1061 chain->tail->data->length += delta;
1062 current_length += delta;
1063 FLAC__ASSERT(current_length == chain->initial_length);
1065 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */
1066 else if(current_length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
1067 FLAC__StreamMetadata *padding;
1068 FLAC__Metadata_Node *node;
1069 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) {
1070 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1073 padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + current_length);
1074 if(0 == (node = node_new_())) {
1075 FLAC__metadata_object_delete(padding);
1076 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1079 node->data = padding;
1080 chain_append_node_(chain, node);
1081 current_length = chain_calculate_length_(chain);
1082 FLAC__ASSERT(current_length == chain->initial_length);
1084 /* if the metadata grew but the last block is padding, try cutting the padding to restore the original length so we don't have to rewrite the whole file */
1085 else if(current_length > chain->initial_length) {
1086 const off_t delta = current_length - chain->initial_length;
1087 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1088 /* if the delta is exactly the size of the last padding block, remove the padding block */
1089 if((off_t)chain->tail->data->length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH == delta) {
1090 chain_delete_node_(chain, chain->tail);
1091 current_length = chain_calculate_length_(chain);
1092 FLAC__ASSERT(current_length == chain->initial_length);
1094 /* if there is at least 'delta' bytes of padding, trim the padding down */
1095 else if((off_t)chain->tail->data->length >= delta) {
1096 chain->tail->data->length -= delta;
1097 current_length -= delta;
1098 FLAC__ASSERT(current_length == chain->initial_length);
1104 return current_length;
1107 static FLAC__bool chain_read_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__IOCallback_Tell tell_cb)
1109 FLAC__Metadata_Node *node;
1111 FLAC__ASSERT(0 != chain);
1113 /* we assume we're already at the beginning of the file */
1115 switch(seek_to_first_metadata_block_cb_(handle, read_cb, seek_cb)) {
1119 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1122 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1125 chain->status = FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
1133 FLAC__int64 pos = tell_cb(handle);
1135 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1138 chain->first_offset = (off_t)pos;
1143 FLAC__MetadataType type;
1149 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1153 if(!read_metadata_block_header_cb_(handle, read_cb, &is_last, &type, &length)) {
1154 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1158 node->data = FLAC__metadata_object_new(type);
1159 if(0 == node->data) {
1161 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1165 node->data->is_last = is_last;
1166 node->data->length = length;
1168 chain->status = get_equivalent_status_(read_metadata_block_data_cb_(handle, read_cb, seek_cb, node->data));
1169 if(chain->status != FLAC__METADATA_CHAIN_STATUS_OK) {
1173 chain_append_node_(chain, node);
1178 FLAC__int64 pos = tell_cb(handle);
1180 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1183 chain->last_offset = (off_t)pos;
1186 chain->initial_length = chain_calculate_length_(chain);
1191 static FLAC__bool chain_rewrite_metadata_in_place_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, FLAC__IOCallback_Seek seek_cb)
1193 FLAC__Metadata_Node *node;
1195 FLAC__ASSERT(0 != chain);
1196 FLAC__ASSERT(0 != chain->head);
1198 if(0 != seek_cb(handle, chain->first_offset, SEEK_SET)) {
1199 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1203 for(node = chain->head; node; node = node->next) {
1204 if(!write_metadata_block_header_cb_(handle, write_cb, node->data)) {
1205 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1208 if(!write_metadata_block_data_cb_(handle, write_cb, node->data)) {
1209 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1214 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1216 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
1220 static FLAC__bool chain_rewrite_metadata_in_place_(FLAC__Metadata_Chain *chain)
1225 FLAC__ASSERT(0 != chain->filename);
1227 if(0 == (file = fopen(chain->filename, "r+b"))) {
1228 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1232 /* chain_rewrite_metadata_in_place_cb_() sets chain->status for us */
1233 ret = chain_rewrite_metadata_in_place_cb_(chain, (FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, fseek_wrapper_);
1240 static FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix)
1244 FLAC__Metadata_SimpleIteratorStatus status;
1245 const FLAC__Metadata_Node *node;
1247 FLAC__ASSERT(0 != chain);
1248 FLAC__ASSERT(0 != chain->filename);
1249 FLAC__ASSERT(0 != chain->head);
1251 /* copy the file prefix (data up to first metadata block */
1252 if(0 == (f = fopen(chain->filename, "rb"))) {
1253 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1256 if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) {
1257 chain->status = get_equivalent_status_(status);
1258 cleanup_tempfile_(&tempfile, &tempfilename);
1261 if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) {
1262 chain->status = get_equivalent_status_(status);
1263 cleanup_tempfile_(&tempfile, &tempfilename);
1267 /* write the metadata */
1268 for(node = chain->head; node; node = node->next) {
1269 if(!write_metadata_block_header_(tempfile, &status, node->data)) {
1270 chain->status = get_equivalent_status_(status);
1273 if(!write_metadata_block_data_(tempfile, &status, node->data)) {
1274 chain->status = get_equivalent_status_(status);
1278 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1280 /* copy the file postfix (everything after the metadata) */
1281 if(0 != fseeko(f, chain->last_offset, SEEK_SET)) {
1282 cleanup_tempfile_(&tempfile, &tempfilename);
1283 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1286 if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) {
1287 cleanup_tempfile_(&tempfile, &tempfilename);
1288 chain->status = get_equivalent_status_(status);
1292 /* move the tempfile on top of the original */
1294 if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status))
1300 /* assumes 'handle' is already at beginning of file */
1301 static FLAC__bool chain_rewrite_file_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__IOCallback_Eof eof_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb)
1303 FLAC__Metadata_SimpleIteratorStatus status;
1304 const FLAC__Metadata_Node *node;
1306 FLAC__ASSERT(0 != chain);
1307 FLAC__ASSERT(0 == chain->filename);
1308 FLAC__ASSERT(0 != chain->head);
1310 /* copy the file prefix (data up to first metadata block */
1311 if(!copy_n_bytes_from_file_cb_(handle, read_cb, temp_handle, temp_write_cb, chain->first_offset, &status)) {
1312 chain->status = get_equivalent_status_(status);
1316 /* write the metadata */
1317 for(node = chain->head; node; node = node->next) {
1318 if(!write_metadata_block_header_cb_(temp_handle, temp_write_cb, node->data)) {
1319 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1322 if(!write_metadata_block_data_cb_(temp_handle, temp_write_cb, node->data)) {
1323 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1327 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1329 /* copy the file postfix (everything after the metadata) */
1330 if(0 != seek_cb(handle, chain->last_offset, SEEK_SET)) {
1331 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1334 if(!copy_remaining_bytes_from_file_cb_(handle, read_cb, eof_cb, temp_handle, temp_write_cb, &status)) {
1335 chain->status = get_equivalent_status_(status);
1342 FLAC_API FLAC__Metadata_Chain *FLAC__metadata_chain_new()
1344 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)calloc(1, sizeof(FLAC__Metadata_Chain));
1352 FLAC_API void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain)
1354 FLAC__ASSERT(0 != chain);
1356 chain_clear_(chain);
1361 FLAC_API FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain)
1363 FLAC__Metadata_ChainStatus status;
1365 FLAC__ASSERT(0 != chain);
1367 status = chain->status;
1368 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
1372 FLAC_API FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename)
1377 FLAC__ASSERT(0 != chain);
1378 FLAC__ASSERT(0 != filename);
1380 chain_clear_(chain);
1382 if(0 == (chain->filename = strdup(filename))) {
1383 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1387 if(0 == (file = fopen(filename, "rb"))) {
1388 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1392 /* chain_read_cb_() sets chain->status for us */
1393 ret = chain_read_cb_(chain, file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, ftell_wrapper_);
1400 FLAC_API FLAC__bool FLAC__metadata_chain_read_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1402 FLAC__ASSERT(0 != chain);
1404 chain_clear_(chain);
1406 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.tell) {
1407 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1412 if(0 != callbacks.seek(handle, 0, SEEK_SET)) {
1413 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1417 if(!chain_read_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.tell))
1418 return false; /* chain->status is already set by chain_read_cb_ */
1423 FLAC_API FLAC__bool FLAC__metadata_chain_check_if_tempfile_needed(FLAC__Metadata_Chain *chain, FLAC__bool use_padding)
1425 /* This does all the same checks that are in chain_prepare_for_write_()
1426 * but doesn't actually alter the chain. Make sure to update the logic
1427 * here if chain_prepare_for_write_() changes.
1429 const off_t current_length = chain_calculate_length_(chain);
1431 FLAC__ASSERT(0 != chain);
1434 /* if the metadata shrank and the last block is padding, we just extend the last padding block */
1435 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING)
1437 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */
1438 else if(current_length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length)
1440 /* if the metadata grew but the last block is padding, try cutting the padding to restore the original length so we don't have to rewrite the whole file */
1441 else if(current_length > chain->initial_length) {
1442 const off_t delta = current_length - chain->initial_length;
1443 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1444 /* if the delta is exactly the size of the last padding block, remove the padding block */
1445 if((off_t)chain->tail->data->length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH == delta)
1447 /* if there is at least 'delta' bytes of padding, trim the padding down */
1448 else if((off_t)chain->tail->data->length >= delta)
1454 return (current_length != chain->initial_length);
1457 FLAC_API FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats)
1460 const char *tempfile_path_prefix = 0;
1461 off_t current_length;
1463 FLAC__ASSERT(0 != chain);
1465 if (0 == chain->filename) {
1466 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1470 current_length = chain_prepare_for_write_(chain, use_padding);
1472 /* a return value of 0 means there was an error; chain->status is already set */
1473 if (0 == current_length)
1476 if(preserve_file_stats)
1477 get_file_stats_(chain->filename, &stats);
1479 if(current_length == chain->initial_length) {
1480 if(!chain_rewrite_metadata_in_place_(chain))
1484 if(!chain_rewrite_file_(chain, tempfile_path_prefix))
1487 /* recompute lengths and offsets */
1489 const FLAC__Metadata_Node *node;
1490 chain->initial_length = current_length;
1491 chain->last_offset = chain->first_offset;
1492 for(node = chain->head; node; node = node->next)
1493 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1497 if(preserve_file_stats)
1498 set_file_stats_(chain->filename, &stats);
1503 FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1505 off_t current_length;
1507 FLAC__ASSERT(0 != chain);
1509 if (0 != chain->filename) {
1510 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1514 if (0 == callbacks.write || 0 == callbacks.seek) {
1515 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1519 if (FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) {
1520 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL;
1524 current_length = chain_prepare_for_write_(chain, use_padding);
1526 /* a return value of 0 means there was an error; chain->status is already set */
1527 if (0 == current_length)
1530 FLAC__ASSERT(current_length == chain->initial_length);
1532 return chain_rewrite_metadata_in_place_cb_(chain, handle, callbacks.write, callbacks.seek);
1535 FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks_and_tempfile(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks, FLAC__IOHandle temp_handle, FLAC__IOCallbacks temp_callbacks)
1537 off_t current_length;
1539 FLAC__ASSERT(0 != chain);
1541 if (0 != chain->filename) {
1542 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1546 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.eof) {
1547 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1550 if (0 == temp_callbacks.write) {
1551 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1555 if (!FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) {
1556 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL;
1560 current_length = chain_prepare_for_write_(chain, use_padding);
1562 /* a return value of 0 means there was an error; chain->status is already set */
1563 if (0 == current_length)
1566 FLAC__ASSERT(current_length != chain->initial_length);
1569 if(0 != callbacks.seek(handle, 0, SEEK_SET)) {
1570 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1574 if(!chain_rewrite_file_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.eof, temp_handle, temp_callbacks.write))
1577 /* recompute lengths and offsets */
1579 const FLAC__Metadata_Node *node;
1580 chain->initial_length = current_length;
1581 chain->last_offset = chain->first_offset;
1582 for(node = chain->head; node; node = node->next)
1583 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1589 FLAC_API void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain)
1591 FLAC__Metadata_Node *node;
1593 FLAC__ASSERT(0 != chain);
1595 for(node = chain->head; node; ) {
1596 if(!chain_merge_adjacent_padding_(chain, node))
1601 FLAC_API void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain)
1603 FLAC__Metadata_Node *node, *save;
1606 FLAC__ASSERT(0 != chain);
1609 * Don't try and be too smart... this simple algo is good enough for
1610 * the small number of nodes that we deal with.
1612 for(i = 0, node = chain->head; i < chain->nodes; i++) {
1613 if(node->data->type == FLAC__METADATA_TYPE_PADDING) {
1615 chain_remove_node_(chain, node);
1616 chain_append_node_(chain, node);
1624 FLAC__metadata_chain_merge_padding(chain);
1628 FLAC_API FLAC__Metadata_Iterator *FLAC__metadata_iterator_new()
1630 FLAC__Metadata_Iterator *iterator = (FLAC__Metadata_Iterator*)calloc(1, sizeof(FLAC__Metadata_Iterator));
1632 /* calloc() implies:
1633 iterator->current = 0;
1634 iterator->chain = 0;
1640 FLAC_API void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator)
1642 FLAC__ASSERT(0 != iterator);
1647 FLAC_API void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain)
1649 FLAC__ASSERT(0 != iterator);
1650 FLAC__ASSERT(0 != chain);
1651 FLAC__ASSERT(0 != chain->head);
1653 iterator->chain = chain;
1654 iterator->current = chain->head;
1657 FLAC_API FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator)
1659 FLAC__ASSERT(0 != iterator);
1661 if(0 == iterator->current || 0 == iterator->current->next)
1664 iterator->current = iterator->current->next;
1668 FLAC_API FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator)
1670 FLAC__ASSERT(0 != iterator);
1672 if(0 == iterator->current || 0 == iterator->current->prev)
1675 iterator->current = iterator->current->prev;
1679 FLAC_API FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator)
1681 FLAC__ASSERT(0 != iterator);
1682 FLAC__ASSERT(0 != iterator->current);
1683 FLAC__ASSERT(0 != iterator->current->data);
1685 return iterator->current->data->type;
1688 FLAC_API FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator)
1690 FLAC__ASSERT(0 != iterator);
1691 FLAC__ASSERT(0 != iterator->current);
1693 return iterator->current->data;
1696 FLAC_API FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1698 FLAC__ASSERT(0 != iterator);
1699 FLAC__ASSERT(0 != block);
1700 return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block);
1703 FLAC_API FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding)
1705 FLAC__Metadata_Node *save;
1707 FLAC__ASSERT(0 != iterator);
1708 FLAC__ASSERT(0 != iterator->current);
1710 if(0 == iterator->current->prev) {
1711 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1715 save = iterator->current->prev;
1717 if(replace_with_padding) {
1718 FLAC__metadata_object_delete_data(iterator->current->data);
1719 iterator->current->data->type = FLAC__METADATA_TYPE_PADDING;
1722 chain_delete_node_(iterator->chain, iterator->current);
1725 iterator->current = save;
1729 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1731 FLAC__Metadata_Node *node;
1733 FLAC__ASSERT(0 != iterator);
1734 FLAC__ASSERT(0 != iterator->current);
1735 FLAC__ASSERT(0 != block);
1737 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1740 if(0 == iterator->current->prev) {
1741 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1745 if(0 == (node = node_new_()))
1749 iterator_insert_node_(iterator, node);
1750 iterator->current = node;
1754 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1756 FLAC__Metadata_Node *node;
1758 FLAC__ASSERT(0 != iterator);
1759 FLAC__ASSERT(0 != iterator->current);
1760 FLAC__ASSERT(0 != block);
1762 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1765 if(0 == (node = node_new_()))
1769 iterator_insert_node_after_(iterator, node);
1770 iterator->current = node;
1775 /****************************************************************************
1777 * Local function definitions
1779 ***************************************************************************/
1781 void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1787 for(i = 0; i < bytes; i++) {
1788 *(--b) = (FLAC__byte)(val & 0xff);
1793 void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1797 for(i = 0; i < bytes; i++) {
1798 *(b++) = (FLAC__byte)(val & 0xff);
1803 void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes)
1809 for(i = 0; i < bytes; i++) {
1810 *(--b) = (FLAC__byte)(val & 0xff);
1815 FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes)
1817 FLAC__uint32 ret = 0;
1820 for(i = 0; i < bytes; i++)
1821 ret = (ret << 8) | (FLAC__uint32)(*b++);
1826 FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes)
1828 FLAC__uint32 ret = 0;
1833 for(i = 0; i < bytes; i++)
1834 ret = (ret << 8) | (FLAC__uint32)(*--b);
1839 FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes)
1841 FLAC__uint64 ret = 0;
1844 for(i = 0; i < bytes; i++)
1845 ret = (ret << 8) | (FLAC__uint64)(*b++);
1850 FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator)
1852 FLAC__ASSERT(0 != iterator);
1853 FLAC__ASSERT(0 != iterator->file);
1855 if(!read_metadata_block_header_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, &iterator->is_last, &iterator->type, &iterator->length)) {
1856 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1863 FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block)
1865 FLAC__ASSERT(0 != iterator);
1866 FLAC__ASSERT(0 != iterator->file);
1868 iterator->status = read_metadata_block_data_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, block);
1870 return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
1873 FLAC__bool read_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__bool *is_last, FLAC__MetadataType *type, unsigned *length)
1875 FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH];
1877 if(read_cb(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH)
1880 *is_last = raw_header[0] & 0x80? true : false;
1881 *type = (FLAC__MetadataType)(raw_header[0] & 0x7f);
1882 *length = unpack_uint32_(raw_header + 1, 3);
1884 /* Note that we don't check:
1885 * if(iterator->type >= FLAC__METADATA_TYPE_UNDEFINED)
1886 * we just will read in an opaque block
1892 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata *block)
1894 switch(block->type) {
1895 case FLAC__METADATA_TYPE_STREAMINFO:
1896 return read_metadata_block_data_streaminfo_cb_(handle, read_cb, &block->data.stream_info);
1897 case FLAC__METADATA_TYPE_PADDING:
1898 return read_metadata_block_data_padding_cb_(handle, seek_cb, &block->data.padding, block->length);
1899 case FLAC__METADATA_TYPE_APPLICATION:
1900 return read_metadata_block_data_application_cb_(handle, read_cb, &block->data.application, block->length);
1901 case FLAC__METADATA_TYPE_SEEKTABLE:
1902 return read_metadata_block_data_seektable_cb_(handle, read_cb, &block->data.seek_table, block->length);
1903 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1904 return read_metadata_block_data_vorbis_comment_cb_(handle, read_cb, &block->data.vorbis_comment);
1905 case FLAC__METADATA_TYPE_CUESHEET:
1906 return read_metadata_block_data_cuesheet_cb_(handle, read_cb, &block->data.cue_sheet);
1907 case FLAC__METADATA_TYPE_PICTURE:
1908 return read_metadata_block_data_picture_cb_(handle, read_cb, &block->data.picture);
1910 return read_metadata_block_data_unknown_cb_(handle, read_cb, &block->data.unknown, block->length);
1914 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block)
1916 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b;
1918 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
1919 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1923 /* we are using hardcoded numbers for simplicity but we should
1924 * probably eventually write a bit-level unpacker and use the
1925 * _STREAMINFO_ constants.
1927 block->min_blocksize = unpack_uint32_(b, 2); b += 2;
1928 block->max_blocksize = unpack_uint32_(b, 2); b += 2;
1929 block->min_framesize = unpack_uint32_(b, 3); b += 3;
1930 block->max_framesize = unpack_uint32_(b, 3); b += 3;
1931 block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4);
1932 block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
1933 block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 4) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1;
1934 block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4);
1935 memcpy(block->md5sum, b+8, 16);
1937 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1940 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_Padding *block, unsigned block_length)
1942 (void)block; /* nothing to do; we don't care about reading the padding bytes */
1944 if(0 != seek_cb(handle, block_length, SEEK_CUR))
1945 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
1947 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1950 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, unsigned block_length)
1952 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
1954 if(read_cb(block->id, 1, id_bytes, handle) != id_bytes)
1955 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1957 block_length -= id_bytes;
1959 if(block_length == 0) {
1963 if(0 == (block->data = (FLAC__byte*)malloc(block_length)))
1964 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1966 if(read_cb(block->data, 1, block_length, handle) != block_length)
1967 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1970 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1973 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, unsigned block_length)
1976 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
1978 FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0);
1980 block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1982 if(block->num_points == 0)
1984 else if(0 == (block->points = (FLAC__StreamMetadata_SeekPoint*)malloc(block->num_points * sizeof(FLAC__StreamMetadata_SeekPoint))))
1985 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
1987 for(i = 0; i < block->num_points; i++) {
1988 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
1989 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
1990 /* some MAGIC NUMBERs here */
1991 block->points[i].sample_number = unpack_uint64_(buffer, 8);
1992 block->points[i].stream_offset = unpack_uint64_(buffer+8, 8);
1993 block->points[i].frame_samples = unpack_uint32_(buffer+16, 2);
1996 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
1999 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment_Entry *entry)
2001 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
2002 FLAC__byte buffer[4]; /* magic number is asserted below */
2004 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8 == sizeof(buffer));
2006 if(read_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2007 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2008 entry->length = unpack_uint32_little_endian_(buffer, entry_length_len);
2010 if(0 != entry->entry)
2013 if(entry->length == 0) {
2017 if(0 == (entry->entry = (FLAC__byte*)malloc(entry->length+1)))
2018 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2020 if(read_cb(entry->entry, 1, entry->length, handle) != entry->length)
2021 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2023 entry->entry[entry->length] = '\0';
2026 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2029 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment *block)
2032 FLAC__Metadata_SimpleIteratorStatus status;
2033 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
2034 FLAC__byte buffer[4]; /* magic number is asserted below */
2036 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8 == sizeof(buffer));
2038 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, &(block->vendor_string))))
2041 if(read_cb(buffer, 1, num_comments_len, handle) != num_comments_len)
2042 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2043 block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len);
2045 if(block->num_comments == 0) {
2046 block->comments = 0;
2048 else if(0 == (block->comments = (FLAC__StreamMetadata_VorbisComment_Entry*)calloc(block->num_comments, sizeof(FLAC__StreamMetadata_VorbisComment_Entry))))
2049 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2051 for(i = 0; i < block->num_comments; i++) {
2052 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, block->comments + i)))
2056 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2059 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track)
2062 FLAC__byte buffer[32]; /* asserted below that this is big enough */
2064 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
2065 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
2066 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);
2068 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
2069 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
2070 if(read_cb(buffer, 1, len, handle) != len)
2071 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2072 track->offset = unpack_uint64_(buffer, len);
2074 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
2075 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
2076 if(read_cb(buffer, 1, len, handle) != len)
2077 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2078 track->number = (FLAC__byte)unpack_uint32_(buffer, len);
2080 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
2081 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
2082 if(read_cb(track->isrc, 1, len, handle) != len)
2083 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2085 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);
2086 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
2087 if(read_cb(buffer, 1, len, handle) != len)
2088 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2089 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN == 1);
2090 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN == 1);
2091 track->type = buffer[0] >> 7;
2092 track->pre_emphasis = (buffer[0] >> 6) & 1;
2094 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
2095 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
2096 if(read_cb(buffer, 1, len, handle) != len)
2097 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2098 track->num_indices = (FLAC__byte)unpack_uint32_(buffer, len);
2100 if(track->num_indices == 0) {
2103 else if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)calloc(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index))))
2104 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2106 for(i = 0; i < track->num_indices; i++) {
2107 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
2108 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
2109 if(read_cb(buffer, 1, len, handle) != len)
2110 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2111 track->indices[i].offset = unpack_uint64_(buffer, len);
2113 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
2114 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
2115 if(read_cb(buffer, 1, len, handle) != len)
2116 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2117 track->indices[i].number = (FLAC__byte)unpack_uint32_(buffer, len);
2119 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
2120 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
2121 if(read_cb(buffer, 1, len, handle) != len)
2122 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2125 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2128 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block)
2131 FLAC__Metadata_SimpleIteratorStatus status;
2132 FLAC__byte buffer[1024]; /* MSVC needs a constant expression so we put a magic number and assert */
2134 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN)/8 <= sizeof(buffer));
2135 FLAC__ASSERT(sizeof(FLAC__uint64) <= sizeof(buffer));
2137 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
2138 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
2139 if(read_cb(block->media_catalog_number, 1, len, handle) != len)
2140 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2142 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
2143 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
2144 if(read_cb(buffer, 1, len, handle) != len)
2145 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2146 block->lead_in = unpack_uint64_(buffer, len);
2148 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
2149 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
2150 if(read_cb(buffer, 1, len, handle) != len)
2151 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2152 block->is_cd = buffer[0]&0x80? true : false;
2154 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
2155 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
2156 if(read_cb(buffer, 1, len, handle) != len)
2157 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2158 block->num_tracks = unpack_uint32_(buffer, len);
2160 if(block->num_tracks == 0) {
2163 else if(0 == (block->tracks = (FLAC__StreamMetadata_CueSheet_Track*)calloc(block->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track))))
2164 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2166 for(i = 0; i < block->num_tracks; i++) {
2167 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_cuesheet_track_cb_(handle, read_cb, block->tracks + i)))
2171 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2174 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cstring_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__byte **data, FLAC__uint32 *length, FLAC__uint32 length_len)
2176 FLAC__byte buffer[sizeof(FLAC__uint32)];
2178 FLAC__ASSERT(0 != data);
2179 FLAC__ASSERT(length_len%8 == 0);
2181 length_len /= 8; /* convert to bytes */
2183 FLAC__ASSERT(sizeof(buffer) >= length_len);
2185 if(read_cb(buffer, 1, length_len, handle) != length_len)
2186 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2187 *length = unpack_uint32_(buffer, length_len);
2192 if(0 == (*data = (FLAC__byte*)malloc(*length+1)))
2193 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2196 if(read_cb(*data, 1, *length, handle) != *length)
2197 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2200 (*data)[*length] = '\0';
2202 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2205 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Picture *block)
2207 FLAC__Metadata_SimpleIteratorStatus status;
2208 FLAC__byte buffer[4]; /* asserted below that this is big enough */
2211 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8);
2212 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8);
2213 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8);
2214 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8);
2215 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8);
2217 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_TYPE_LEN % 8 == 0);
2218 len = FLAC__STREAM_METADATA_PICTURE_TYPE_LEN / 8;
2219 if(read_cb(buffer, 1, len, handle) != len)
2220 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2221 block->type = (FLAC__StreamMetadata_Picture_Type)unpack_uint32_(buffer, len);
2223 if((status = read_metadata_block_data_picture_cstring_cb_(handle, read_cb, (FLAC__byte**)(&(block->mime_type)), &len, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN)) != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK)
2226 if((status = read_metadata_block_data_picture_cstring_cb_(handle, read_cb, &(block->description), &len, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN)) != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK)
2229 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN % 8 == 0);
2230 len = FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN / 8;
2231 if(read_cb(buffer, 1, len, handle) != len)
2232 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2233 block->width = unpack_uint32_(buffer, len);
2235 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN % 8 == 0);
2236 len = FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN / 8;
2237 if(read_cb(buffer, 1, len, handle) != len)
2238 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2239 block->height = unpack_uint32_(buffer, len);
2241 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN % 8 == 0);
2242 len = FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN / 8;
2243 if(read_cb(buffer, 1, len, handle) != len)
2244 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2245 block->depth = unpack_uint32_(buffer, len);
2247 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_COLORS_LEN % 8 == 0);
2248 len = FLAC__STREAM_METADATA_PICTURE_COLORS_LEN / 8;
2249 if(read_cb(buffer, 1, len, handle) != len)
2250 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2251 block->colors = unpack_uint32_(buffer, len);
2253 /* for convenience we use read_metadata_block_data_picture_cstring_cb_() even though it adds an extra terminating NUL we don't use */
2254 if((status = read_metadata_block_data_picture_cstring_cb_(handle, read_cb, &(block->data), &(block->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN)) != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK)
2257 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2260 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, unsigned block_length)
2262 if(block_length == 0) {
2266 if(0 == (block->data = (FLAC__byte*)malloc(block_length)))
2267 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2269 if(read_cb(block->data, 1, block_length, handle) != block_length)
2270 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2273 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2276 FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
2278 FLAC__ASSERT(0 != file);
2279 FLAC__ASSERT(0 != status);
2281 if(!write_metadata_block_header_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) {
2282 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2289 FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
2291 FLAC__ASSERT(0 != file);
2292 FLAC__ASSERT(0 != status);
2294 if (write_metadata_block_data_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) {
2295 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2299 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2304 FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block)
2306 FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH];
2308 FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
2310 buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type;
2311 pack_uint32_(block->length, buffer + 1, 3);
2313 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH)
2319 FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block)
2321 FLAC__ASSERT(0 != block);
2323 switch(block->type) {
2324 case FLAC__METADATA_TYPE_STREAMINFO:
2325 return write_metadata_block_data_streaminfo_cb_(handle, write_cb, &block->data.stream_info);
2326 case FLAC__METADATA_TYPE_PADDING:
2327 return write_metadata_block_data_padding_cb_(handle, write_cb, &block->data.padding, block->length);
2328 case FLAC__METADATA_TYPE_APPLICATION:
2329 return write_metadata_block_data_application_cb_(handle, write_cb, &block->data.application, block->length);
2330 case FLAC__METADATA_TYPE_SEEKTABLE:
2331 return write_metadata_block_data_seektable_cb_(handle, write_cb, &block->data.seek_table);
2332 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
2333 return write_metadata_block_data_vorbis_comment_cb_(handle, write_cb, &block->data.vorbis_comment);
2334 case FLAC__METADATA_TYPE_CUESHEET:
2335 return write_metadata_block_data_cuesheet_cb_(handle, write_cb, &block->data.cue_sheet);
2336 case FLAC__METADATA_TYPE_PICTURE:
2337 return write_metadata_block_data_picture_cb_(handle, write_cb, &block->data.picture);
2339 return write_metadata_block_data_unknown_cb_(handle, write_cb, &block->data.unknown, block->length);
2343 FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block)
2345 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH];
2346 const unsigned channels1 = block->channels - 1;
2347 const unsigned bps1 = block->bits_per_sample - 1;
2349 /* we are using hardcoded numbers for simplicity but we should
2350 * probably eventually write a bit-level packer and use the
2351 * _STREAMINFO_ constants.
2353 pack_uint32_(block->min_blocksize, buffer, 2);
2354 pack_uint32_(block->max_blocksize, buffer+2, 2);
2355 pack_uint32_(block->min_framesize, buffer+4, 3);
2356 pack_uint32_(block->max_framesize, buffer+7, 3);
2357 buffer[10] = (block->sample_rate >> 12) & 0xff;
2358 buffer[11] = (block->sample_rate >> 4) & 0xff;
2359 buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4);
2360 buffer[13] = (FLAC__byte)(((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f));
2361 pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4);
2362 memcpy(buffer+18, block->md5sum, 16);
2364 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
2370 FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, unsigned block_length)
2372 unsigned i, n = block_length;
2373 FLAC__byte buffer[1024];
2377 memset(buffer, 0, 1024);
2379 for(i = 0; i < n/1024; i++)
2380 if(write_cb(buffer, 1, 1024, handle) != 1024)
2385 if(write_cb(buffer, 1, n, handle) != n)
2391 FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, unsigned block_length)
2393 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
2395 if(write_cb(block->id, 1, id_bytes, handle) != id_bytes)
2398 block_length -= id_bytes;
2400 if(write_cb(block->data, 1, block_length, handle) != block_length)
2406 FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block)
2409 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
2411 for(i = 0; i < block->num_points; i++) {
2412 /* some MAGIC NUMBERs here */
2413 pack_uint64_(block->points[i].sample_number, buffer, 8);
2414 pack_uint64_(block->points[i].stream_offset, buffer+8, 8);
2415 pack_uint32_(block->points[i].frame_samples, buffer+16, 2);
2416 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
2423 FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block)
2426 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
2427 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
2428 FLAC__byte buffer[4]; /* magic number is asserted below */
2430 FLAC__ASSERT(max(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8 == sizeof(buffer));
2432 pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len);
2433 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2435 if(write_cb(block->vendor_string.entry, 1, block->vendor_string.length, handle) != block->vendor_string.length)
2438 pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len);
2439 if(write_cb(buffer, 1, num_comments_len, handle) != num_comments_len)
2442 for(i = 0; i < block->num_comments; i++) {
2443 pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len);
2444 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2446 if(write_cb(block->comments[i].entry, 1, block->comments[i].length, handle) != block->comments[i].length)
2453 FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block)
2456 FLAC__byte buffer[1024]; /* asserted below that this is big enough */
2458 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
2459 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN/8);
2460 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);
2461 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
2463 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
2464 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
2465 if(write_cb(block->media_catalog_number, 1, len, handle) != len)
2468 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
2469 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
2470 pack_uint64_(block->lead_in, buffer, len);
2471 if(write_cb(buffer, 1, len, handle) != len)
2474 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
2475 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
2476 memset(buffer, 0, len);
2479 if(write_cb(buffer, 1, len, handle) != len)
2482 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
2483 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
2484 pack_uint32_(block->num_tracks, buffer, len);
2485 if(write_cb(buffer, 1, len, handle) != len)
2488 for(i = 0; i < block->num_tracks; i++) {
2489 FLAC__StreamMetadata_CueSheet_Track *track = block->tracks + i;
2491 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
2492 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
2493 pack_uint64_(track->offset, buffer, len);
2494 if(write_cb(buffer, 1, len, handle) != len)
2497 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
2498 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
2499 pack_uint32_(track->number, buffer, len);
2500 if(write_cb(buffer, 1, len, handle) != len)
2503 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
2504 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
2505 if(write_cb(track->isrc, 1, len, handle) != len)
2508 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);
2509 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
2510 memset(buffer, 0, len);
2511 buffer[0] = (track->type << 7) | (track->pre_emphasis << 6);
2512 if(write_cb(buffer, 1, len, handle) != len)
2515 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
2516 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
2517 pack_uint32_(track->num_indices, buffer, len);
2518 if(write_cb(buffer, 1, len, handle) != len)
2521 for(j = 0; j < track->num_indices; j++) {
2522 FLAC__StreamMetadata_CueSheet_Index *index = track->indices + j;
2524 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
2525 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
2526 pack_uint64_(index->offset, buffer, len);
2527 if(write_cb(buffer, 1, len, handle) != len)
2530 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
2531 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
2532 pack_uint32_(index->number, buffer, len);
2533 if(write_cb(buffer, 1, len, handle) != len)
2536 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
2537 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
2538 memset(buffer, 0, len);
2539 if(write_cb(buffer, 1, len, handle) != len)
2547 FLAC__bool write_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Picture *block)
2551 FLAC__byte buffer[4]; /* magic number is asserted below */
2553 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_TYPE_LEN%8);
2554 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN%8);
2555 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN%8);
2556 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN%8);
2557 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN%8);
2558 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN%8);
2559 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_COLORS_LEN%8);
2560 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN%8);
2561 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8);
2562 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN/8);
2563 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN/8);
2564 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8);
2565 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8);
2566 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8);
2567 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8);
2568 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN/8);
2570 len = FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8;
2571 pack_uint32_(block->type, buffer, len);
2572 if(write_cb(buffer, 1, len, handle) != len)
2575 len = FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN/8;
2576 slen = strlen(block->mime_type);
2577 pack_uint32_(slen, buffer, len);
2578 if(write_cb(buffer, 1, len, handle) != len)
2580 if(write_cb(block->mime_type, 1, slen, handle) != slen)
2583 len = FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN/8;
2584 slen = strlen((const char *)block->description);
2585 pack_uint32_(slen, buffer, len);
2586 if(write_cb(buffer, 1, len, handle) != len)
2588 if(write_cb(block->description, 1, slen, handle) != slen)
2591 len = FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8;
2592 pack_uint32_(block->width, buffer, len);
2593 if(write_cb(buffer, 1, len, handle) != len)
2596 len = FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8;
2597 pack_uint32_(block->height, buffer, len);
2598 if(write_cb(buffer, 1, len, handle) != len)
2601 len = FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8;
2602 pack_uint32_(block->depth, buffer, len);
2603 if(write_cb(buffer, 1, len, handle) != len)
2606 len = FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8;
2607 pack_uint32_(block->colors, buffer, len);
2608 if(write_cb(buffer, 1, len, handle) != len)
2611 len = FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN/8;
2612 pack_uint32_(block->data_length, buffer, len);
2613 if(write_cb(buffer, 1, len, handle) != len)
2615 if(write_cb(block->data, 1, block->data_length, handle) != block->data_length)
2621 FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, unsigned block_length)
2623 if(write_cb(block->data, 1, block_length, handle) != block_length)
2629 FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block)
2631 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2632 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2636 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
2639 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
2642 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2643 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2647 return read_metadata_block_header_(iterator);
2650 FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last)
2652 FLAC__StreamMetadata *padding;
2654 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2655 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2659 block->is_last = false;
2661 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
2664 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
2667 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)))
2668 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2670 padding->is_last = padding_is_last;
2671 padding->length = padding_length;
2673 if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) {
2674 FLAC__metadata_object_delete(padding);
2678 if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) {
2679 FLAC__metadata_object_delete(padding);
2683 FLAC__metadata_object_delete(padding);
2685 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2686 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2690 return read_metadata_block_header_(iterator);
2693 FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append)
2697 int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */
2698 off_t fixup_is_last_flag_offset = -1;
2700 FLAC__ASSERT(0 != block || append == false);
2702 if(iterator->is_last) {
2704 fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */
2705 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2707 else if(0 == block) {
2708 simple_iterator_push_(iterator);
2709 if(!FLAC__metadata_simple_iterator_prev(iterator)) {
2710 (void)simple_iterator_pop_(iterator);
2713 fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */
2714 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2715 if(!simple_iterator_pop_(iterator))
2720 if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append))
2724 if(!write_metadata_block_header_(tempfile, &iterator->status, block)) {
2725 cleanup_tempfile_(&tempfile, &tempfilename);
2729 if(!write_metadata_block_data_(tempfile, &iterator->status, block)) {
2730 cleanup_tempfile_(&tempfile, &tempfilename);
2735 if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0))
2739 return FLAC__metadata_simple_iterator_next(iterator);
2744 void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator)
2746 FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH);
2747 iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth];
2751 FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator)
2753 FLAC__ASSERT(iterator->depth > 0);
2755 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2756 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2760 return read_metadata_block_header_(iterator);
2767 * 3: not a FLAC file
2769 unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb)
2771 FLAC__byte buffer[4];
2775 FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == sizeof(buffer));
2777 /* skip any id3v2 tag */
2779 n = read_cb(buffer, 1, 4, handle);
2784 else if(0 == memcmp(buffer, "ID3", 3)) {
2785 unsigned tag_length = 0;
2787 /* skip to the tag length */
2788 if(seek_cb(handle, 2, SEEK_CUR) < 0)
2791 /* read the length */
2792 for(i = 0; i < 4; i++) {
2793 if(read_cb(buffer, 1, 1, handle) < 1 || buffer[0] & 0x80)
2796 tag_length |= (buffer[0] & 0x7f);
2799 /* skip the rest of the tag */
2800 if(seek_cb(handle, tag_length, SEEK_CUR) < 0)
2803 /* read the stream sync code */
2805 n = read_cb(buffer, 1, 4, handle);
2812 /* check for the fLaC signature */
2813 if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH))
2819 unsigned seek_to_first_metadata_block_(FILE *f)
2821 return seek_to_first_metadata_block_cb_((FLAC__IOHandle)f, (FLAC__IOCallback_Read)fread, fseek_wrapper_);
2824 FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append)
2826 const off_t offset_end = append? iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length : iterator->offset[iterator->depth];
2828 if(0 != fseeko(iterator->file, 0, SEEK_SET)) {
2829 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2832 if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) {
2833 cleanup_tempfile_(tempfile, tempfilename);
2836 if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) {
2837 cleanup_tempfile_(tempfile, tempfilename);
2844 FLAC__bool simple_iterator_copy_file_postfix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, int fixup_is_last_code, off_t fixup_is_last_flag_offset, FLAC__bool backup)
2846 off_t save_offset = iterator->offset[iterator->depth];
2847 FLAC__ASSERT(0 != *tempfile);
2849 if(0 != fseeko(iterator->file, save_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length, SEEK_SET)) {
2850 cleanup_tempfile_(tempfile, tempfilename);
2851 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2854 if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) {
2855 cleanup_tempfile_(tempfile, tempfilename);
2859 if(fixup_is_last_code != 0) {
2861 * if code == 1, it means a block was appended to the end so
2862 * we have to clear the is_last flag of the previous block
2863 * if code == -1, it means the last block was deleted so
2864 * we have to set the is_last flag of the previous block
2866 /* MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */
2868 if(0 != fseeko(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2869 cleanup_tempfile_(tempfile, tempfilename);
2870 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2873 if(fread(&x, 1, 1, *tempfile) != 1) {
2874 cleanup_tempfile_(tempfile, tempfilename);
2875 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2878 if(fixup_is_last_code > 0) {
2879 FLAC__ASSERT(x & 0x80);
2883 FLAC__ASSERT(!(x & 0x80));
2886 if(0 != fseeko(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
2887 cleanup_tempfile_(tempfile, tempfilename);
2888 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2891 if(local__fwrite(&x, 1, 1, *tempfile) != 1) {
2892 cleanup_tempfile_(tempfile, tempfilename);
2893 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2898 (void)fclose(iterator->file);
2900 if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status))
2903 if(iterator->has_stats)
2904 set_file_stats_(iterator->filename, &iterator->stats);
2906 if(!simple_iterator_prime_input_(iterator, !iterator->is_writable))
2909 while(iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length < save_offset)
2910 if(!FLAC__metadata_simple_iterator_next(iterator))
2915 /* move the iterator to it's original block faster by faking a push, then doing a pop_ */
2916 FLAC__ASSERT(iterator->depth == 0);
2917 iterator->offset[0] = save_offset;
2919 return simple_iterator_pop_(iterator);
2923 FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status)
2925 FLAC__byte buffer[8192];
2929 n = min(sizeof(buffer), bytes);
2930 if(fread(buffer, 1, n, file) != n) {
2931 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2934 if(local__fwrite(buffer, 1, n, tempfile) != n) {
2935 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2944 FLAC__bool copy_n_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status)
2946 FLAC__byte buffer[8192];
2950 n = min(sizeof(buffer), bytes);
2951 if(read_cb(buffer, 1, n, handle) != n) {
2952 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2955 if(temp_write_cb(buffer, 1, n, temp_handle) != n) {
2956 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2965 FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status)
2967 FLAC__byte buffer[8192];
2970 while(!feof(file)) {
2971 n = fread(buffer, 1, sizeof(buffer), file);
2972 if(n == 0 && !feof(file)) {
2973 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2976 if(n > 0 && local__fwrite(buffer, 1, n, tempfile) != n) {
2977 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2985 FLAC__bool copy_remaining_bytes_from_file_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Eof eof_cb, FLAC__IOHandle temp_handle, FLAC__IOCallback_Write temp_write_cb, FLAC__Metadata_SimpleIteratorStatus *status)
2987 FLAC__byte buffer[8192];
2990 while(!eof_cb(handle)) {
2991 n = read_cb(buffer, 1, sizeof(buffer), handle);
2992 if(n == 0 && !eof_cb(handle)) {
2993 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2996 if(n > 0 && temp_write_cb(buffer, 1, n, temp_handle) != n) {
2997 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3005 FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
3007 static const char *tempfile_suffix = ".metadata_edit";
3008 if(0 == tempfile_path_prefix) {
3009 if(0 == (*tempfilename = (char*)malloc(strlen(filename) + strlen(tempfile_suffix) + 1))) {
3010 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
3013 strcpy(*tempfilename, filename);
3014 strcat(*tempfilename, tempfile_suffix);
3017 const char *p = strrchr(filename, '/');
3023 if(0 == (*tempfilename = (char*)malloc(strlen(tempfile_path_prefix) + 1 + strlen(p) + strlen(tempfile_suffix) + 1))) {
3024 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
3027 strcpy(*tempfilename, tempfile_path_prefix);
3028 strcat(*tempfilename, "/");
3029 strcat(*tempfilename, p);
3030 strcat(*tempfilename, tempfile_suffix);
3033 if(0 == (*tempfile = fopen(*tempfilename, "w+b"))) {
3034 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
3041 FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
3043 FLAC__ASSERT(0 != filename);
3044 FLAC__ASSERT(0 != tempfile);
3045 FLAC__ASSERT(0 != *tempfile);
3046 FLAC__ASSERT(0 != tempfilename);
3047 FLAC__ASSERT(0 != *tempfilename);
3048 FLAC__ASSERT(0 != status);
3050 (void)fclose(*tempfile);
3053 #if defined _MSC_VER || defined __MINGW32__ || defined __EMX__
3054 /* on some flavors of windows, rename() will fail if the destination already exists */
3055 if(unlink(filename) < 0) {
3056 cleanup_tempfile_(tempfile, tempfilename);
3057 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR;
3062 /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just rename(): */
3063 if(0 != rename(*tempfilename, filename)) {
3064 cleanup_tempfile_(tempfile, tempfilename);
3065 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR;
3069 cleanup_tempfile_(tempfile, tempfilename);
3074 void cleanup_tempfile_(FILE **tempfile, char **tempfilename)
3076 if(0 != *tempfile) {
3077 (void)fclose(*tempfile);
3081 if(0 != *tempfilename) {
3082 (void)unlink(*tempfilename);
3083 free(*tempfilename);
3088 FLAC__bool get_file_stats_(const char *filename, struct stat *stats)
3090 FLAC__ASSERT(0 != filename);
3091 FLAC__ASSERT(0 != stats);
3092 return (0 == stat(filename, stats));
3095 void set_file_stats_(const char *filename, struct stat *stats)
3097 struct utimbuf srctime;
3099 FLAC__ASSERT(0 != filename);
3100 FLAC__ASSERT(0 != stats);
3102 srctime.actime = stats->st_atime;
3103 srctime.modtime = stats->st_mtime;
3104 (void)chmod(filename, stats->st_mode);
3105 (void)utime(filename, &srctime);
3106 #if !defined _MSC_VER && !defined __MINGW32__ && !defined __EMX__
3107 (void)chown(filename, stats->st_uid, -1);
3108 (void)chown(filename, -1, stats->st_gid);
3112 int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence)
3114 return fseeko((FILE*)handle, (off_t)offset, whence);
3117 FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle)
3119 return ftello((FILE*)handle);
3122 FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status)
3125 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK:
3126 return FLAC__METADATA_CHAIN_STATUS_OK;
3127 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT:
3128 return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT;
3129 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE:
3130 return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
3131 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE:
3132 return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
3133 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE:
3134 return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE;
3135 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA:
3136 return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA;
3137 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR:
3138 return FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
3139 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR:
3140 return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
3141 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR:
3142 return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
3143 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR:
3144 return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR;
3145 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR:
3146 return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR;
3147 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR:
3148 return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
3149 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR:
3151 return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;