1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2001,2002,2003,2004,2005,2006,2007,2008,2009 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 __BORLANDC__ || defined __MINGW32__
42 #if defined __BORLANDC__
43 #include <utime.h> /* for utime() */
45 #include <sys/utime.h> /* for utime() */
47 #include <io.h> /* for chmod() */
48 #include <sys/types.h> /* for off_t */
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"
60 #include "share/alloc.h"
61 #include "share/compat.h"
66 #define max(a,b) ((a)>(b)?(a):(b))
70 #define min(a,b) ((a)<(b)?(a):(b))
73 /****************************************************************************
75 * Local function declarations
77 ***************************************************************************/
79 static void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
80 static void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes);
81 static void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes);
82 static FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes);
83 static FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes);
84 static FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes);
86 static FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator);
87 static FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block);
88 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);
89 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);
90 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block);
91 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);
92 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);
93 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);
94 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);
95 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment *block);
96 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track);
97 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block);
98 static FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Picture *block);
99 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);
101 static FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
102 static FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block);
103 static FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block);
104 static FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block);
105 static FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block);
106 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);
107 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);
108 static FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block);
109 static FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block);
110 static FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block);
111 static FLAC__bool write_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Picture *block);
112 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);
114 static FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block);
115 static FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last);
116 static FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append);
118 static void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator);
119 static FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator);
121 static unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb);
122 static unsigned seek_to_first_metadata_block_(FILE *f);
124 static FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append);
125 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);
127 static FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status);
128 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);
129 static FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status);
130 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);
132 static FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
133 static FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status);
134 static void cleanup_tempfile_(FILE **tempfile, char **tempfilename);
136 static FLAC__bool get_file_stats_(const char *filename, struct stat *stats);
137 static void set_file_stats_(const char *filename, struct stat *stats);
139 static int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence);
140 static FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle);
142 static FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status);
145 #ifdef FLAC__VALGRIND_TESTING
146 static size_t local__fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
148 size_t ret = fwrite(ptr, size, nmemb, stream);
154 #define local__fwrite fwrite
157 /****************************************************************************
159 * Level 0 implementation
161 ***************************************************************************/
163 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
164 static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
165 static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
168 FLAC__bool got_error;
169 FLAC__StreamMetadata *object;
170 } level0_client_data;
172 static FLAC__StreamMetadata *get_one_metadata_block_(const char *filename, FLAC__MetadataType type)
174 level0_client_data cd;
175 FLAC__StreamDecoder *decoder;
177 FLAC__ASSERT(0 != filename);
179 cd.got_error = false;
182 decoder = FLAC__stream_decoder_new();
187 FLAC__stream_decoder_set_md5_checking(decoder, false);
188 FLAC__stream_decoder_set_metadata_ignore_all(decoder);
189 FLAC__stream_decoder_set_metadata_respond(decoder, type);
191 if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, metadata_callback_, error_callback_, &cd) != FLAC__STREAM_DECODER_INIT_STATUS_OK || cd.got_error) {
192 (void)FLAC__stream_decoder_finish(decoder);
193 FLAC__stream_decoder_delete(decoder);
197 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder) || cd.got_error) {
198 (void)FLAC__stream_decoder_finish(decoder);
199 FLAC__stream_decoder_delete(decoder);
201 FLAC__metadata_object_delete(cd.object);
205 (void)FLAC__stream_decoder_finish(decoder);
206 FLAC__stream_decoder_delete(decoder);
211 FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo)
213 FLAC__StreamMetadata *object;
215 FLAC__ASSERT(0 != filename);
216 FLAC__ASSERT(0 != streaminfo);
218 object = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_STREAMINFO);
221 /* can just copy the contents since STREAMINFO has no internal structure */
222 *streaminfo = *object;
223 FLAC__metadata_object_delete(object);
231 FLAC_API FLAC__bool FLAC__metadata_get_tags(const char *filename, FLAC__StreamMetadata **tags)
233 FLAC__ASSERT(0 != filename);
234 FLAC__ASSERT(0 != tags);
236 *tags = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_VORBIS_COMMENT);
241 FLAC_API FLAC__bool FLAC__metadata_get_cuesheet(const char *filename, FLAC__StreamMetadata **cuesheet)
243 FLAC__ASSERT(0 != filename);
244 FLAC__ASSERT(0 != cuesheet);
246 *cuesheet = get_one_metadata_block_(filename, FLAC__METADATA_TYPE_CUESHEET);
248 return 0 != *cuesheet;
251 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
253 (void)decoder, (void)frame, (void)buffer, (void)client_data;
255 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
258 void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
260 level0_client_data *cd = (level0_client_data *)client_data;
264 * we assume we only get here when the one metadata block we were
265 * looking for was passed to us
267 if(!cd->got_error && 0 == cd->object) {
268 if(0 == (cd->object = FLAC__metadata_object_clone(metadata)))
269 cd->got_error = true;
273 void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
275 level0_client_data *cd = (level0_client_data *)client_data;
278 if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
279 cd->got_error = true;
282 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)
284 FLAC__Metadata_SimpleIterator *it;
285 FLAC__uint64 max_area_seen = 0;
286 FLAC__uint64 max_depth_seen = 0;
288 FLAC__ASSERT(0 != filename);
289 FLAC__ASSERT(0 != picture);
293 it = FLAC__metadata_simple_iterator_new();
296 if(!FLAC__metadata_simple_iterator_init(it, filename, /*read_only=*/true, /*preserve_file_stats=*/true)) {
297 FLAC__metadata_simple_iterator_delete(it);
301 if(FLAC__metadata_simple_iterator_get_block_type(it) == FLAC__METADATA_TYPE_PICTURE) {
302 FLAC__StreamMetadata *obj = FLAC__metadata_simple_iterator_get_block(it);
303 FLAC__uint64 area = (FLAC__uint64)obj->data.picture.width * (FLAC__uint64)obj->data.picture.height;
304 /* check constraints */
306 (type == (FLAC__StreamMetadata_Picture_Type)(-1) || type == obj->data.picture.type) &&
307 (mime_type == 0 || !strcmp(mime_type, obj->data.picture.mime_type)) &&
308 (description == 0 || !strcmp((const char *)description, (const char *)obj->data.picture.description)) &&
309 obj->data.picture.width <= max_width &&
310 obj->data.picture.height <= max_height &&
311 obj->data.picture.depth <= max_depth &&
312 obj->data.picture.colors <= max_colors &&
313 (area > max_area_seen || (area == max_area_seen && obj->data.picture.depth > max_depth_seen))
316 FLAC__metadata_object_delete(*picture);
318 max_area_seen = area;
319 max_depth_seen = obj->data.picture.depth;
322 FLAC__metadata_object_delete(obj);
325 } while(FLAC__metadata_simple_iterator_next(it));
327 FLAC__metadata_simple_iterator_delete(it);
329 return (0 != *picture);
333 /****************************************************************************
335 * Level 1 implementation
337 ***************************************************************************/
339 #define SIMPLE_ITERATOR_MAX_PUSH_DEPTH (1+4)
340 /* 1 for initial offset, +4 for our own personal use */
342 struct FLAC__Metadata_SimpleIterator {
344 char *filename, *tempfile_path_prefix;
346 FLAC__bool has_stats;
347 FLAC__bool is_writable;
348 FLAC__Metadata_SimpleIteratorStatus status;
349 off_t offset[SIMPLE_ITERATOR_MAX_PUSH_DEPTH];
350 off_t first_offset; /* this is the offset to the STREAMINFO block */
352 /* this is the metadata block header of the current block we are pointing to: */
354 FLAC__MetadataType type;
358 FLAC_API const char * const FLAC__Metadata_SimpleIteratorStatusString[] = {
359 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK",
360 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT",
361 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE",
362 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE",
363 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE",
364 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA",
365 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR",
366 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR",
367 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR",
368 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR",
369 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR",
370 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR",
371 "FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR"
375 FLAC_API FLAC__Metadata_SimpleIterator *FLAC__metadata_simple_iterator_new(void)
377 FLAC__Metadata_SimpleIterator *iterator = calloc(1, sizeof(FLAC__Metadata_SimpleIterator));
381 iterator->filename = 0;
382 iterator->tempfile_path_prefix = 0;
383 iterator->has_stats = false;
384 iterator->is_writable = false;
385 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
386 iterator->first_offset = iterator->offset[0] = -1;
393 static void simple_iterator_free_guts_(FLAC__Metadata_SimpleIterator *iterator)
395 FLAC__ASSERT(0 != iterator);
397 if(0 != iterator->file) {
398 fclose(iterator->file);
400 if(iterator->has_stats)
401 set_file_stats_(iterator->filename, &iterator->stats);
403 if(0 != iterator->filename) {
404 free(iterator->filename);
405 iterator->filename = 0;
407 if(0 != iterator->tempfile_path_prefix) {
408 free(iterator->tempfile_path_prefix);
409 iterator->tempfile_path_prefix = 0;
413 FLAC_API void FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator *iterator)
415 FLAC__ASSERT(0 != iterator);
417 simple_iterator_free_guts_(iterator);
421 FLAC_API FLAC__Metadata_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator *iterator)
423 FLAC__Metadata_SimpleIteratorStatus status;
425 FLAC__ASSERT(0 != iterator);
427 status = iterator->status;
428 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
432 static FLAC__bool simple_iterator_prime_input_(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool read_only)
436 FLAC__ASSERT(0 != iterator);
438 if(read_only || 0 == (iterator->file = fopen(iterator->filename, "r+b"))) {
439 iterator->is_writable = false;
440 if(read_only || errno == EACCES) {
441 if(0 == (iterator->file = fopen(iterator->filename, "rb"))) {
442 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
447 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
452 iterator->is_writable = true;
455 ret = seek_to_first_metadata_block_(iterator->file);
459 iterator->first_offset = iterator->offset[iterator->depth] = ftello(iterator->file);
460 return read_metadata_block_header_(iterator);
462 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
465 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
468 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE;
477 @@@ If we decide to finish implementing this, put this comment back in metadata.h
479 * The 'tempfile_path_prefix' allows you to specify a directory where
480 * tempfiles should go. Remember that if your metadata edits cause the
481 * FLAC file to grow, the entire file will have to be rewritten. If
482 * 'tempfile_path_prefix' is NULL, the temp file will be written in the
483 * same directory as the original FLAC file. This makes replacing the
484 * original with the tempfile fast but requires extra space in the same
485 * partition for the tempfile. If space is a problem, you can pass a
486 * directory name belonging to a different partition in
487 * 'tempfile_path_prefix'. Note that you should use the forward slash
488 * '/' as the directory separator. A trailing slash is not needed; it
489 * will be added automatically.
491 FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool preserve_file_stats, const char *tempfile_path_prefix);
494 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)
496 const char *tempfile_path_prefix = 0; /*@@@ search for comments near 'rename(...)' for what it will take to finish implementing this */
498 FLAC__ASSERT(0 != iterator);
499 FLAC__ASSERT(0 != filename);
501 simple_iterator_free_guts_(iterator);
503 if(!read_only && preserve_file_stats)
504 iterator->has_stats = get_file_stats_(filename, &iterator->stats);
506 if(0 == (iterator->filename = strdup(filename))) {
507 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
510 if(0 != tempfile_path_prefix && 0 == (iterator->tempfile_path_prefix = strdup(tempfile_path_prefix))) {
511 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
515 return simple_iterator_prime_input_(iterator, read_only);
518 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator *iterator)
520 FLAC__ASSERT(0 != iterator);
521 FLAC__ASSERT(0 != iterator->file);
523 return iterator->is_writable;
526 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator *iterator)
528 FLAC__ASSERT(0 != iterator);
529 FLAC__ASSERT(0 != iterator->file);
531 if(iterator->is_last)
534 if(0 != fseeko(iterator->file, iterator->length, SEEK_CUR)) {
535 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
539 iterator->offset[iterator->depth] = ftello(iterator->file);
541 return read_metadata_block_header_(iterator);
544 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator *iterator)
548 FLAC__ASSERT(0 != iterator);
549 FLAC__ASSERT(0 != iterator->file);
551 if(iterator->offset[iterator->depth] == iterator->first_offset)
554 if(0 != fseeko(iterator->file, iterator->first_offset, SEEK_SET)) {
555 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
558 this_offset = iterator->first_offset;
559 if(!read_metadata_block_header_(iterator))
562 /* we ignore any error from ftello() and catch it in fseeko() */
563 while(ftello(iterator->file) + (off_t)iterator->length < iterator->offset[iterator->depth]) {
564 if(0 != fseeko(iterator->file, iterator->length, SEEK_CUR)) {
565 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
568 this_offset = ftello(iterator->file);
569 if(!read_metadata_block_header_(iterator))
573 iterator->offset[iterator->depth] = this_offset;
579 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_last(const FLAC__Metadata_SimpleIterator *iterator)
581 FLAC__ASSERT(0 != iterator);
582 FLAC__ASSERT(0 != iterator->file);
584 return iterator->is_last;
588 FLAC_API off_t FLAC__metadata_simple_iterator_get_block_offset(const FLAC__Metadata_SimpleIterator *iterator)
590 FLAC__ASSERT(0 != iterator);
591 FLAC__ASSERT(0 != iterator->file);
593 return iterator->offset[iterator->depth];
596 FLAC_API FLAC__MetadataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator *iterator)
598 FLAC__ASSERT(0 != iterator);
599 FLAC__ASSERT(0 != iterator->file);
601 return iterator->type;
605 FLAC_API unsigned FLAC__metadata_simple_iterator_get_block_length(const FLAC__Metadata_SimpleIterator *iterator)
607 FLAC__ASSERT(0 != iterator);
608 FLAC__ASSERT(0 != iterator->file);
610 return iterator->length;
614 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_get_application_id(FLAC__Metadata_SimpleIterator *iterator, FLAC__byte *id)
616 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
618 FLAC__ASSERT(0 != iterator);
619 FLAC__ASSERT(0 != iterator->file);
620 FLAC__ASSERT(0 != id);
622 if(iterator->type != FLAC__METADATA_TYPE_APPLICATION) {
623 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
627 if(fread(id, 1, id_bytes, iterator->file) != id_bytes) {
628 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
633 if(0 != fseeko(iterator->file, -((int)id_bytes), SEEK_CUR)) {
634 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
641 FLAC_API FLAC__StreamMetadata *FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator *iterator)
643 FLAC__StreamMetadata *block = FLAC__metadata_object_new(iterator->type);
645 FLAC__ASSERT(0 != iterator);
646 FLAC__ASSERT(0 != iterator->file);
649 block->is_last = iterator->is_last;
650 block->length = iterator->length;
652 if(!read_metadata_block_data_(iterator, block)) {
653 FLAC__metadata_object_delete(block);
657 /* back up to the beginning of the block data to stay consistent */
658 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH, SEEK_SET)) {
659 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
660 FLAC__metadata_object_delete(block);
665 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
670 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
672 FLAC__ASSERT_DECLARATION(off_t debug_target_offset = iterator->offset[iterator->depth];)
675 FLAC__ASSERT(0 != iterator);
676 FLAC__ASSERT(0 != iterator->file);
677 FLAC__ASSERT(0 != block);
679 if(!iterator->is_writable) {
680 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE;
684 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO || block->type == FLAC__METADATA_TYPE_STREAMINFO) {
685 if(iterator->type != block->type) {
686 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
691 block->is_last = iterator->is_last;
693 if(iterator->length == block->length)
694 return write_metadata_block_stationary_(iterator, block);
695 else if(iterator->length > block->length) {
696 if(use_padding && iterator->length >= FLAC__STREAM_METADATA_HEADER_LENGTH + block->length) {
697 ret = write_metadata_block_stationary_with_padding_(iterator, block, iterator->length - FLAC__STREAM_METADATA_HEADER_LENGTH - block->length, block->is_last);
698 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
699 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);
709 else /* iterator->length < block->length */ {
710 unsigned padding_leftover = 0;
711 FLAC__bool padding_is_last = false;
713 /* first see if we can even use padding */
714 if(iterator->is_last) {
718 const unsigned extra_padding_bytes_required = block->length - iterator->length;
719 simple_iterator_push_(iterator);
720 if(!FLAC__metadata_simple_iterator_next(iterator)) {
721 (void)simple_iterator_pop_(iterator);
724 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
728 if(FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length == extra_padding_bytes_required) {
729 padding_leftover = 0;
730 block->is_last = iterator->is_last;
732 else if(iterator->length < extra_padding_bytes_required)
735 padding_leftover = FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length - extra_padding_bytes_required;
736 padding_is_last = iterator->is_last;
737 block->is_last = false;
740 if(!simple_iterator_pop_(iterator))
745 if(padding_leftover == 0) {
746 ret = write_metadata_block_stationary_(iterator, block);
747 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
748 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
752 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
753 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
754 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
755 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
760 ret = rewrite_whole_file_(iterator, block, /*append=*/false);
761 FLAC__ASSERT(!ret || iterator->offset[iterator->depth] == debug_target_offset);
762 FLAC__ASSERT(!ret || ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
768 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding)
770 unsigned padding_leftover = 0;
771 FLAC__bool padding_is_last = false;
773 FLAC__ASSERT_DECLARATION(off_t debug_target_offset = iterator->offset[iterator->depth] + FLAC__STREAM_METADATA_HEADER_LENGTH + iterator->length;)
776 FLAC__ASSERT(0 != iterator);
777 FLAC__ASSERT(0 != iterator->file);
778 FLAC__ASSERT(0 != block);
780 if(!iterator->is_writable)
783 if(block->type == FLAC__METADATA_TYPE_STREAMINFO) {
784 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
788 block->is_last = iterator->is_last;
791 /* first see if we can even use padding */
792 if(iterator->is_last) {
796 simple_iterator_push_(iterator);
797 if(!FLAC__metadata_simple_iterator_next(iterator)) {
798 (void)simple_iterator_pop_(iterator);
801 if(iterator->type != FLAC__METADATA_TYPE_PADDING) {
805 if(iterator->length == block->length) {
806 padding_leftover = 0;
807 block->is_last = iterator->is_last;
809 else if(iterator->length < FLAC__STREAM_METADATA_HEADER_LENGTH + block->length)
812 padding_leftover = iterator->length - block->length;
813 padding_is_last = iterator->is_last;
814 block->is_last = false;
817 if(!simple_iterator_pop_(iterator))
822 /* move to the next block, which is suitable padding */
823 if(!FLAC__metadata_simple_iterator_next(iterator))
825 if(padding_leftover == 0) {
826 ret = write_metadata_block_stationary_(iterator, block);
827 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
828 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
832 FLAC__ASSERT(padding_leftover >= FLAC__STREAM_METADATA_HEADER_LENGTH);
833 ret = write_metadata_block_stationary_with_padding_(iterator, block, padding_leftover - FLAC__STREAM_METADATA_HEADER_LENGTH, padding_is_last);
834 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
835 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
840 ret = rewrite_whole_file_(iterator, block, /*append=*/true);
841 FLAC__ASSERT(iterator->offset[iterator->depth] == debug_target_offset);
842 FLAC__ASSERT(ftello(iterator->file) == debug_target_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH);
847 FLAC_API FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool use_padding)
849 FLAC__ASSERT_DECLARATION(off_t debug_target_offset = iterator->offset[iterator->depth];)
852 if(iterator->type == FLAC__METADATA_TYPE_STREAMINFO) {
853 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT;
858 FLAC__StreamMetadata *padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
860 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
863 padding->length = iterator->length;
864 if(!FLAC__metadata_simple_iterator_set_block(iterator, padding, false)) {
865 FLAC__metadata_object_delete(padding);
868 FLAC__metadata_object_delete(padding);
869 if(!FLAC__metadata_simple_iterator_prev(iterator))
871 FLAC__ASSERT(iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length == debug_target_offset);
872 FLAC__ASSERT(ftello(iterator->file) + (off_t)iterator->length == debug_target_offset);
876 ret = rewrite_whole_file_(iterator, 0, /*append=*/false);
877 FLAC__ASSERT(iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length == debug_target_offset);
878 FLAC__ASSERT(ftello(iterator->file) + (off_t)iterator->length == debug_target_offset);
885 /****************************************************************************
887 * Level 2 implementation
889 ***************************************************************************/
892 typedef struct FLAC__Metadata_Node {
893 FLAC__StreamMetadata *data;
894 struct FLAC__Metadata_Node *prev, *next;
895 } FLAC__Metadata_Node;
897 struct FLAC__Metadata_Chain {
898 char *filename; /* will be NULL if using callbacks */
900 FLAC__Metadata_Node *head;
901 FLAC__Metadata_Node *tail;
903 FLAC__Metadata_ChainStatus status;
904 off_t first_offset, last_offset;
906 * This is the length of the chain initially read from the FLAC file.
907 * it is used to compare against the current length to decide whether
908 * or not the whole file has to be rewritten.
910 off_t initial_length;
911 /* @@@ hacky, these are currently only needed by ogg reader */
912 FLAC__IOHandle handle;
913 FLAC__IOCallback_Read read_cb;
916 struct FLAC__Metadata_Iterator {
917 FLAC__Metadata_Chain *chain;
918 FLAC__Metadata_Node *current;
921 FLAC_API const char * const FLAC__Metadata_ChainStatusString[] = {
922 "FLAC__METADATA_CHAIN_STATUS_OK",
923 "FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT",
924 "FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE",
925 "FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE",
926 "FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE",
927 "FLAC__METADATA_CHAIN_STATUS_BAD_METADATA",
928 "FLAC__METADATA_CHAIN_STATUS_READ_ERROR",
929 "FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR",
930 "FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR",
931 "FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR",
932 "FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR",
933 "FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR",
934 "FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR",
935 "FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS",
936 "FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH",
937 "FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL"
941 static FLAC__Metadata_Node *node_new_(void)
943 return calloc(1, sizeof(FLAC__Metadata_Node));
946 static void node_delete_(FLAC__Metadata_Node *node)
948 FLAC__ASSERT(0 != node);
950 FLAC__metadata_object_delete(node->data);
954 static void chain_init_(FLAC__Metadata_Chain *chain)
956 FLAC__ASSERT(0 != chain);
959 chain->is_ogg = false;
960 chain->head = chain->tail = 0;
962 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
963 chain->initial_length = 0;
967 static void chain_clear_(FLAC__Metadata_Chain *chain)
969 FLAC__Metadata_Node *node, *next;
971 FLAC__ASSERT(0 != chain);
973 for(node = chain->head; node; ) {
979 if(0 != chain->filename)
980 free(chain->filename);
985 static void chain_append_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
987 FLAC__ASSERT(0 != chain);
988 FLAC__ASSERT(0 != node);
989 FLAC__ASSERT(0 != node->data);
991 node->next = node->prev = 0;
992 node->data->is_last = true;
994 chain->tail->data->is_last = false;
999 FLAC__ASSERT(0 != chain->tail);
1000 chain->tail->next = node;
1001 node->prev = chain->tail;
1007 static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
1009 FLAC__ASSERT(0 != chain);
1010 FLAC__ASSERT(0 != node);
1012 if(node == chain->head)
1013 chain->head = node->next;
1015 node->prev->next = node->next;
1017 if(node == chain->tail)
1018 chain->tail = node->prev;
1020 node->next->prev = node->prev;
1022 if(0 != chain->tail)
1023 chain->tail->data->is_last = true;
1028 static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
1030 chain_remove_node_(chain, node);
1034 static off_t chain_calculate_length_(FLAC__Metadata_Chain *chain)
1036 const FLAC__Metadata_Node *node;
1038 for(node = chain->head; node; node = node->next)
1039 length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1043 static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
1045 FLAC__ASSERT(0 != node);
1046 FLAC__ASSERT(0 != node->data);
1047 FLAC__ASSERT(0 != iterator);
1048 FLAC__ASSERT(0 != iterator->current);
1049 FLAC__ASSERT(0 != iterator->chain);
1050 FLAC__ASSERT(0 != iterator->chain->head);
1051 FLAC__ASSERT(0 != iterator->chain->tail);
1053 node->data->is_last = false;
1055 node->prev = iterator->current->prev;
1056 node->next = iterator->current;
1059 iterator->chain->head = node;
1061 node->prev->next = node;
1063 iterator->current->prev = node;
1065 iterator->chain->nodes++;
1068 static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
1070 FLAC__ASSERT(0 != node);
1071 FLAC__ASSERT(0 != node->data);
1072 FLAC__ASSERT(0 != iterator);
1073 FLAC__ASSERT(0 != iterator->current);
1074 FLAC__ASSERT(0 != iterator->chain);
1075 FLAC__ASSERT(0 != iterator->chain->head);
1076 FLAC__ASSERT(0 != iterator->chain->tail);
1078 iterator->current->data->is_last = false;
1080 node->prev = iterator->current;
1081 node->next = iterator->current->next;
1084 iterator->chain->tail = node;
1086 node->next->prev = node;
1088 node->prev->next = node;
1090 iterator->chain->tail->data->is_last = true;
1092 iterator->chain->nodes++;
1095 /* return true iff node and node->next are both padding */
1096 static FLAC__bool chain_merge_adjacent_padding_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
1098 if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) {
1099 const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length;
1100 node->data->length += growth;
1102 chain_delete_node_(chain, node->next);
1109 /* Returns the new length of the chain, or 0 if there was an error. */
1110 /* WATCHOUT: This can get called multiple times before a write, so
1111 * it should still work when this happens.
1113 /* WATCHOUT: Make sure to also update the logic in
1114 * FLAC__metadata_chain_check_if_tempfile_needed() if the logic here changes.
1116 static off_t chain_prepare_for_write_(FLAC__Metadata_Chain *chain, FLAC__bool use_padding)
1118 off_t current_length = chain_calculate_length_(chain);
1121 /* if the metadata shrank and the last block is padding, we just extend the last padding block */
1122 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1123 const off_t delta = chain->initial_length - current_length;
1124 chain->tail->data->length += delta;
1125 current_length += delta;
1126 FLAC__ASSERT(current_length == chain->initial_length);
1128 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */
1129 else if(current_length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
1130 FLAC__StreamMetadata *padding;
1131 FLAC__Metadata_Node *node;
1132 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) {
1133 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1136 padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + current_length);
1137 if(0 == (node = node_new_())) {
1138 FLAC__metadata_object_delete(padding);
1139 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1142 node->data = padding;
1143 chain_append_node_(chain, node);
1144 current_length = chain_calculate_length_(chain);
1145 FLAC__ASSERT(current_length == chain->initial_length);
1147 /* 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 */
1148 else if(current_length > chain->initial_length) {
1149 const off_t delta = current_length - chain->initial_length;
1150 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1151 /* if the delta is exactly the size of the last padding block, remove the padding block */
1152 if((off_t)chain->tail->data->length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH == delta) {
1153 chain_delete_node_(chain, chain->tail);
1154 current_length = chain_calculate_length_(chain);
1155 FLAC__ASSERT(current_length == chain->initial_length);
1157 /* if there is at least 'delta' bytes of padding, trim the padding down */
1158 else if((off_t)chain->tail->data->length >= delta) {
1159 chain->tail->data->length -= delta;
1160 current_length -= delta;
1161 FLAC__ASSERT(current_length == chain->initial_length);
1167 return current_length;
1170 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)
1172 FLAC__Metadata_Node *node;
1174 FLAC__ASSERT(0 != chain);
1176 /* we assume we're already at the beginning of the file */
1178 switch(seek_to_first_metadata_block_cb_(handle, read_cb, seek_cb)) {
1182 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1185 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1188 chain->status = FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
1196 FLAC__int64 pos = tell_cb(handle);
1198 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1201 chain->first_offset = (off_t)pos;
1206 FLAC__MetadataType type;
1212 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1216 if(!read_metadata_block_header_cb_(handle, read_cb, &is_last, &type, &length)) {
1218 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1222 node->data = FLAC__metadata_object_new(type);
1223 if(0 == node->data) {
1225 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1229 node->data->is_last = is_last;
1230 node->data->length = length;
1232 chain->status = get_equivalent_status_(read_metadata_block_data_cb_(handle, read_cb, seek_cb, node->data));
1233 if(chain->status != FLAC__METADATA_CHAIN_STATUS_OK) {
1237 chain_append_node_(chain, node);
1242 FLAC__int64 pos = tell_cb(handle);
1244 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
1247 chain->last_offset = (off_t)pos;
1250 chain->initial_length = chain_calculate_length_(chain);
1255 static FLAC__StreamDecoderReadStatus chain_read_ogg_read_cb_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
1257 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data;
1259 if(*bytes > 0 && chain->status == FLAC__METADATA_CHAIN_STATUS_OK) {
1260 *bytes = chain->read_cb(buffer, sizeof(FLAC__byte), *bytes, chain->handle);
1262 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
1264 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
1267 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
1270 static FLAC__StreamDecoderWriteStatus chain_read_ogg_write_cb_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
1272 (void)decoder, (void)frame, (void)buffer, (void)client_data;
1273 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
1276 static void chain_read_ogg_metadata_cb_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
1278 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data;
1279 FLAC__Metadata_Node *node;
1285 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1289 node->data = FLAC__metadata_object_clone(metadata);
1290 if(0 == node->data) {
1292 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1296 chain_append_node_(chain, node);
1299 static void chain_read_ogg_error_cb_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
1301 FLAC__Metadata_Chain *chain = (FLAC__Metadata_Chain*)client_data;
1302 (void)decoder, (void)status;
1303 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */
1306 static FLAC__bool chain_read_ogg_cb_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb)
1308 FLAC__StreamDecoder *decoder;
1310 FLAC__ASSERT(0 != chain);
1312 /* we assume we're already at the beginning of the file */
1314 chain->handle = handle;
1315 chain->read_cb = read_cb;
1316 if(0 == (decoder = FLAC__stream_decoder_new())) {
1317 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1320 FLAC__stream_decoder_set_metadata_respond_all(decoder);
1321 if(FLAC__stream_decoder_init_ogg_stream(decoder, chain_read_ogg_read_cb_, /*seek_callback=*/0, /*tell_callback=*/0, /*length_callback=*/0, /*eof_callback=*/0, chain_read_ogg_write_cb_, chain_read_ogg_metadata_cb_, chain_read_ogg_error_cb_, chain) != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
1322 FLAC__stream_decoder_delete(decoder);
1323 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */
1327 chain->first_offset = 0; /*@@@ wrong; will need to be set correctly to implement metadata writing for Ogg FLAC */
1329 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder))
1330 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR; /*@@@ maybe needs better error code */
1331 if(chain->status != FLAC__METADATA_CHAIN_STATUS_OK) {
1332 FLAC__stream_decoder_delete(decoder);
1336 FLAC__stream_decoder_delete(decoder);
1338 chain->last_offset = 0; /*@@@ wrong; will need to be set correctly to implement metadata writing for Ogg FLAC */
1340 chain->initial_length = chain_calculate_length_(chain);
1345 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)
1347 FLAC__Metadata_Node *node;
1349 FLAC__ASSERT(0 != chain);
1350 FLAC__ASSERT(0 != chain->head);
1352 if(0 != seek_cb(handle, chain->first_offset, SEEK_SET)) {
1353 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1357 for(node = chain->head; node; node = node->next) {
1358 if(!write_metadata_block_header_cb_(handle, write_cb, node->data)) {
1359 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1362 if(!write_metadata_block_data_cb_(handle, write_cb, node->data)) {
1363 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1368 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1370 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
1374 static FLAC__bool chain_rewrite_metadata_in_place_(FLAC__Metadata_Chain *chain)
1379 FLAC__ASSERT(0 != chain->filename);
1381 if(0 == (file = fopen(chain->filename, "r+b"))) {
1382 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1386 /* chain_rewrite_metadata_in_place_cb_() sets chain->status for us */
1387 ret = chain_rewrite_metadata_in_place_cb_(chain, (FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, fseek_wrapper_);
1394 static FLAC__bool chain_rewrite_file_(FLAC__Metadata_Chain *chain, const char *tempfile_path_prefix)
1398 FLAC__Metadata_SimpleIteratorStatus status;
1399 const FLAC__Metadata_Node *node;
1401 FLAC__ASSERT(0 != chain);
1402 FLAC__ASSERT(0 != chain->filename);
1403 FLAC__ASSERT(0 != chain->head);
1405 /* copy the file prefix (data up to first metadata block */
1406 if(0 == (f = fopen(chain->filename, "rb"))) {
1407 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1410 if(!open_tempfile_(chain->filename, tempfile_path_prefix, &tempfile, &tempfilename, &status)) {
1411 chain->status = get_equivalent_status_(status);
1414 if(!copy_n_bytes_from_file_(f, tempfile, chain->first_offset, &status)) {
1415 chain->status = get_equivalent_status_(status);
1419 /* write the metadata */
1420 for(node = chain->head; node; node = node->next) {
1421 if(!write_metadata_block_header_(tempfile, &status, node->data)) {
1422 chain->status = get_equivalent_status_(status);
1425 if(!write_metadata_block_data_(tempfile, &status, node->data)) {
1426 chain->status = get_equivalent_status_(status);
1430 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1432 /* copy the file postfix (everything after the metadata) */
1433 if(0 != fseeko(f, chain->last_offset, SEEK_SET)) {
1434 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1437 if(!copy_remaining_bytes_from_file_(f, tempfile, &status)) {
1438 chain->status = get_equivalent_status_(status);
1442 /* move the tempfile on top of the original */
1444 if(!transport_tempfile_(chain->filename, &tempfile, &tempfilename, &status))
1451 cleanup_tempfile_(&tempfile, &tempfilename);
1455 /* assumes 'handle' is already at beginning of file */
1456 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)
1458 FLAC__Metadata_SimpleIteratorStatus status;
1459 const FLAC__Metadata_Node *node;
1461 FLAC__ASSERT(0 != chain);
1462 FLAC__ASSERT(0 == chain->filename);
1463 FLAC__ASSERT(0 != chain->head);
1465 /* copy the file prefix (data up to first metadata block */
1466 if(!copy_n_bytes_from_file_cb_(handle, read_cb, temp_handle, temp_write_cb, chain->first_offset, &status)) {
1467 chain->status = get_equivalent_status_(status);
1471 /* write the metadata */
1472 for(node = chain->head; node; node = node->next) {
1473 if(!write_metadata_block_header_cb_(temp_handle, temp_write_cb, node->data)) {
1474 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1477 if(!write_metadata_block_data_cb_(temp_handle, temp_write_cb, node->data)) {
1478 chain->status = FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
1482 /*FLAC__ASSERT(fflush(), ftello() == chain->last_offset);*/
1484 /* copy the file postfix (everything after the metadata) */
1485 if(0 != seek_cb(handle, chain->last_offset, SEEK_SET)) {
1486 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1489 if(!copy_remaining_bytes_from_file_cb_(handle, read_cb, eof_cb, temp_handle, temp_write_cb, &status)) {
1490 chain->status = get_equivalent_status_(status);
1497 FLAC_API FLAC__Metadata_Chain *FLAC__metadata_chain_new(void)
1499 FLAC__Metadata_Chain *chain = calloc(1, sizeof(FLAC__Metadata_Chain));
1507 FLAC_API void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain)
1509 FLAC__ASSERT(0 != chain);
1511 chain_clear_(chain);
1516 FLAC_API FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain)
1518 FLAC__Metadata_ChainStatus status;
1520 FLAC__ASSERT(0 != chain);
1522 status = chain->status;
1523 chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
1527 static FLAC__bool chain_read_(FLAC__Metadata_Chain *chain, const char *filename, FLAC__bool is_ogg)
1532 FLAC__ASSERT(0 != chain);
1533 FLAC__ASSERT(0 != filename);
1535 chain_clear_(chain);
1537 if(0 == (chain->filename = strdup(filename))) {
1538 chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
1542 chain->is_ogg = is_ogg;
1544 if(0 == (file = fopen(filename, "rb"))) {
1545 chain->status = FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
1549 /* the function also sets chain->status for us */
1551 chain_read_ogg_cb_(chain, file, (FLAC__IOCallback_Read)fread) :
1552 chain_read_cb_(chain, file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, ftell_wrapper_)
1560 FLAC_API FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename)
1562 return chain_read_(chain, filename, /*is_ogg=*/false);
1565 /*@@@@add to tests*/
1566 FLAC_API FLAC__bool FLAC__metadata_chain_read_ogg(FLAC__Metadata_Chain *chain, const char *filename)
1568 return chain_read_(chain, filename, /*is_ogg=*/true);
1571 static FLAC__bool chain_read_with_callbacks_(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks, FLAC__bool is_ogg)
1575 FLAC__ASSERT(0 != chain);
1577 chain_clear_(chain);
1579 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.tell) {
1580 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1584 chain->is_ogg = is_ogg;
1587 if(0 != callbacks.seek(handle, 0, SEEK_SET)) {
1588 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1592 /* the function also sets chain->status for us */
1594 chain_read_ogg_cb_(chain, handle, callbacks.read) :
1595 chain_read_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.tell)
1601 FLAC_API FLAC__bool FLAC__metadata_chain_read_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1603 return chain_read_with_callbacks_(chain, handle, callbacks, /*is_ogg=*/false);
1606 /*@@@@add to tests*/
1607 FLAC_API FLAC__bool FLAC__metadata_chain_read_ogg_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1609 return chain_read_with_callbacks_(chain, handle, callbacks, /*is_ogg=*/true);
1612 FLAC_API FLAC__bool FLAC__metadata_chain_check_if_tempfile_needed(FLAC__Metadata_Chain *chain, FLAC__bool use_padding)
1614 /* This does all the same checks that are in chain_prepare_for_write_()
1615 * but doesn't actually alter the chain. Make sure to update the logic
1616 * here if chain_prepare_for_write_() changes.
1618 const off_t current_length = chain_calculate_length_(chain);
1620 FLAC__ASSERT(0 != chain);
1623 /* if the metadata shrank and the last block is padding, we just extend the last padding block */
1624 if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING)
1626 /* if the metadata shrank more than 4 bytes then there's room to add another padding block */
1627 else if(current_length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length)
1629 /* 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 */
1630 else if(current_length > chain->initial_length) {
1631 const off_t delta = current_length - chain->initial_length;
1632 if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
1633 /* if the delta is exactly the size of the last padding block, remove the padding block */
1634 if((off_t)chain->tail->data->length + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH == delta)
1636 /* if there is at least 'delta' bytes of padding, trim the padding down */
1637 else if((off_t)chain->tail->data->length >= delta)
1643 return (current_length != chain->initial_length);
1646 FLAC_API FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats)
1649 const char *tempfile_path_prefix = 0;
1650 off_t current_length;
1652 FLAC__ASSERT(0 != chain);
1654 if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */
1655 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;
1659 if (0 == chain->filename) {
1660 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1664 current_length = chain_prepare_for_write_(chain, use_padding);
1666 /* a return value of 0 means there was an error; chain->status is already set */
1667 if (0 == current_length)
1670 if(preserve_file_stats)
1671 get_file_stats_(chain->filename, &stats);
1673 if(current_length == chain->initial_length) {
1674 if(!chain_rewrite_metadata_in_place_(chain))
1678 if(!chain_rewrite_file_(chain, tempfile_path_prefix))
1681 /* recompute lengths and offsets */
1683 const FLAC__Metadata_Node *node;
1684 chain->initial_length = current_length;
1685 chain->last_offset = chain->first_offset;
1686 for(node = chain->head; node; node = node->next)
1687 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1691 if(preserve_file_stats)
1692 set_file_stats_(chain->filename, &stats);
1697 FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks)
1699 off_t current_length;
1701 FLAC__ASSERT(0 != chain);
1703 if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */
1704 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;
1708 if (0 != chain->filename) {
1709 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1713 if (0 == callbacks.write || 0 == callbacks.seek) {
1714 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1718 if (FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) {
1719 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL;
1723 current_length = chain_prepare_for_write_(chain, use_padding);
1725 /* a return value of 0 means there was an error; chain->status is already set */
1726 if (0 == current_length)
1729 FLAC__ASSERT(current_length == chain->initial_length);
1731 return chain_rewrite_metadata_in_place_cb_(chain, handle, callbacks.write, callbacks.seek);
1734 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)
1736 off_t current_length;
1738 FLAC__ASSERT(0 != chain);
1740 if (chain->is_ogg) { /* cannot write back to Ogg FLAC yet */
1741 chain->status = FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;
1745 if (0 != chain->filename) {
1746 chain->status = FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH;
1750 if (0 == callbacks.read || 0 == callbacks.seek || 0 == callbacks.eof) {
1751 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1754 if (0 == temp_callbacks.write) {
1755 chain->status = FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS;
1759 if (!FLAC__metadata_chain_check_if_tempfile_needed(chain, use_padding)) {
1760 chain->status = FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL;
1764 current_length = chain_prepare_for_write_(chain, use_padding);
1766 /* a return value of 0 means there was an error; chain->status is already set */
1767 if (0 == current_length)
1770 FLAC__ASSERT(current_length != chain->initial_length);
1773 if(0 != callbacks.seek(handle, 0, SEEK_SET)) {
1774 chain->status = FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
1778 if(!chain_rewrite_file_cb_(chain, handle, callbacks.read, callbacks.seek, callbacks.eof, temp_handle, temp_callbacks.write))
1781 /* recompute lengths and offsets */
1783 const FLAC__Metadata_Node *node;
1784 chain->initial_length = current_length;
1785 chain->last_offset = chain->first_offset;
1786 for(node = chain->head; node; node = node->next)
1787 chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
1793 FLAC_API void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain)
1795 FLAC__Metadata_Node *node;
1797 FLAC__ASSERT(0 != chain);
1799 for(node = chain->head; node; ) {
1800 if(!chain_merge_adjacent_padding_(chain, node))
1805 FLAC_API void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain)
1807 FLAC__Metadata_Node *node, *save;
1810 FLAC__ASSERT(0 != chain);
1813 * Don't try and be too smart... this simple algo is good enough for
1814 * the small number of nodes that we deal with.
1816 for(i = 0, node = chain->head; i < chain->nodes; i++) {
1817 if(node->data->type == FLAC__METADATA_TYPE_PADDING) {
1819 chain_remove_node_(chain, node);
1820 chain_append_node_(chain, node);
1828 FLAC__metadata_chain_merge_padding(chain);
1832 FLAC_API FLAC__Metadata_Iterator *FLAC__metadata_iterator_new(void)
1834 FLAC__Metadata_Iterator *iterator = calloc(1, sizeof(FLAC__Metadata_Iterator));
1836 /* calloc() implies:
1837 iterator->current = 0;
1838 iterator->chain = 0;
1844 FLAC_API void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator)
1846 FLAC__ASSERT(0 != iterator);
1851 FLAC_API void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain)
1853 FLAC__ASSERT(0 != iterator);
1854 FLAC__ASSERT(0 != chain);
1855 FLAC__ASSERT(0 != chain->head);
1857 iterator->chain = chain;
1858 iterator->current = chain->head;
1861 FLAC_API FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator)
1863 FLAC__ASSERT(0 != iterator);
1865 if(0 == iterator->current || 0 == iterator->current->next)
1868 iterator->current = iterator->current->next;
1872 FLAC_API FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator)
1874 FLAC__ASSERT(0 != iterator);
1876 if(0 == iterator->current || 0 == iterator->current->prev)
1879 iterator->current = iterator->current->prev;
1883 FLAC_API FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator)
1885 FLAC__ASSERT(0 != iterator);
1886 FLAC__ASSERT(0 != iterator->current);
1887 FLAC__ASSERT(0 != iterator->current->data);
1889 return iterator->current->data->type;
1892 FLAC_API FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator)
1894 FLAC__ASSERT(0 != iterator);
1895 FLAC__ASSERT(0 != iterator->current);
1897 return iterator->current->data;
1900 FLAC_API FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1902 FLAC__ASSERT(0 != iterator);
1903 FLAC__ASSERT(0 != block);
1904 return FLAC__metadata_iterator_delete_block(iterator, false) && FLAC__metadata_iterator_insert_block_after(iterator, block);
1907 FLAC_API FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding)
1909 FLAC__Metadata_Node *save;
1911 FLAC__ASSERT(0 != iterator);
1912 FLAC__ASSERT(0 != iterator->current);
1914 if(0 == iterator->current->prev) {
1915 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1919 save = iterator->current->prev;
1921 if(replace_with_padding) {
1922 FLAC__metadata_object_delete_data(iterator->current->data);
1923 iterator->current->data->type = FLAC__METADATA_TYPE_PADDING;
1926 chain_delete_node_(iterator->chain, iterator->current);
1929 iterator->current = save;
1933 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1935 FLAC__Metadata_Node *node;
1937 FLAC__ASSERT(0 != iterator);
1938 FLAC__ASSERT(0 != iterator->current);
1939 FLAC__ASSERT(0 != block);
1941 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1944 if(0 == iterator->current->prev) {
1945 FLAC__ASSERT(iterator->current->data->type == FLAC__METADATA_TYPE_STREAMINFO);
1949 if(0 == (node = node_new_()))
1953 iterator_insert_node_(iterator, node);
1954 iterator->current = node;
1958 FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block)
1960 FLAC__Metadata_Node *node;
1962 FLAC__ASSERT(0 != iterator);
1963 FLAC__ASSERT(0 != iterator->current);
1964 FLAC__ASSERT(0 != block);
1966 if(block->type == FLAC__METADATA_TYPE_STREAMINFO)
1969 if(0 == (node = node_new_()))
1973 iterator_insert_node_after_(iterator, node);
1974 iterator->current = node;
1979 /****************************************************************************
1981 * Local function definitions
1983 ***************************************************************************/
1985 void pack_uint32_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
1991 for(i = 0; i < bytes; i++) {
1992 *(--b) = (FLAC__byte)(val & 0xff);
1997 void pack_uint32_little_endian_(FLAC__uint32 val, FLAC__byte *b, unsigned bytes)
2001 for(i = 0; i < bytes; i++) {
2002 *(b++) = (FLAC__byte)(val & 0xff);
2007 void pack_uint64_(FLAC__uint64 val, FLAC__byte *b, unsigned bytes)
2013 for(i = 0; i < bytes; i++) {
2014 *(--b) = (FLAC__byte)(val & 0xff);
2019 FLAC__uint32 unpack_uint32_(FLAC__byte *b, unsigned bytes)
2021 FLAC__uint32 ret = 0;
2024 for(i = 0; i < bytes; i++)
2025 ret = (ret << 8) | (FLAC__uint32)(*b++);
2030 FLAC__uint32 unpack_uint32_little_endian_(FLAC__byte *b, unsigned bytes)
2032 FLAC__uint32 ret = 0;
2037 for(i = 0; i < bytes; i++)
2038 ret = (ret << 8) | (FLAC__uint32)(*--b);
2043 FLAC__uint64 unpack_uint64_(FLAC__byte *b, unsigned bytes)
2045 FLAC__uint64 ret = 0;
2048 for(i = 0; i < bytes; i++)
2049 ret = (ret << 8) | (FLAC__uint64)(*b++);
2054 FLAC__bool read_metadata_block_header_(FLAC__Metadata_SimpleIterator *iterator)
2056 FLAC__ASSERT(0 != iterator);
2057 FLAC__ASSERT(0 != iterator->file);
2059 if(!read_metadata_block_header_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, &iterator->is_last, &iterator->type, &iterator->length)) {
2060 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2067 FLAC__bool read_metadata_block_data_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block)
2069 FLAC__ASSERT(0 != iterator);
2070 FLAC__ASSERT(0 != iterator->file);
2072 iterator->status = read_metadata_block_data_cb_((FLAC__IOHandle)iterator->file, (FLAC__IOCallback_Read)fread, fseek_wrapper_, block);
2074 return (iterator->status == FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK);
2077 FLAC__bool read_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__bool *is_last, FLAC__MetadataType *type, unsigned *length)
2079 FLAC__byte raw_header[FLAC__STREAM_METADATA_HEADER_LENGTH];
2081 if(read_cb(raw_header, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH)
2084 *is_last = raw_header[0] & 0x80? true : false;
2085 *type = (FLAC__MetadataType)(raw_header[0] & 0x7f);
2086 *length = unpack_uint32_(raw_header + 1, 3);
2088 /* Note that we don't check:
2089 * if(iterator->type >= FLAC__METADATA_TYPE_UNDEFINED)
2090 * we just will read in an opaque block
2096 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata *block)
2098 switch(block->type) {
2099 case FLAC__METADATA_TYPE_STREAMINFO:
2100 return read_metadata_block_data_streaminfo_cb_(handle, read_cb, &block->data.stream_info);
2101 case FLAC__METADATA_TYPE_PADDING:
2102 return read_metadata_block_data_padding_cb_(handle, seek_cb, &block->data.padding, block->length);
2103 case FLAC__METADATA_TYPE_APPLICATION:
2104 return read_metadata_block_data_application_cb_(handle, read_cb, &block->data.application, block->length);
2105 case FLAC__METADATA_TYPE_SEEKTABLE:
2106 return read_metadata_block_data_seektable_cb_(handle, read_cb, &block->data.seek_table, block->length);
2107 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
2108 return read_metadata_block_data_vorbis_comment_cb_(handle, read_cb, &block->data.vorbis_comment);
2109 case FLAC__METADATA_TYPE_CUESHEET:
2110 return read_metadata_block_data_cuesheet_cb_(handle, read_cb, &block->data.cue_sheet);
2111 case FLAC__METADATA_TYPE_PICTURE:
2112 return read_metadata_block_data_picture_cb_(handle, read_cb, &block->data.picture);
2114 return read_metadata_block_data_unknown_cb_(handle, read_cb, &block->data.unknown, block->length);
2118 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_StreamInfo *block)
2120 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH], *b;
2122 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
2123 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2127 /* we are using hardcoded numbers for simplicity but we should
2128 * probably eventually write a bit-level unpacker and use the
2129 * _STREAMINFO_ constants.
2131 block->min_blocksize = unpack_uint32_(b, 2); b += 2;
2132 block->max_blocksize = unpack_uint32_(b, 2); b += 2;
2133 block->min_framesize = unpack_uint32_(b, 3); b += 3;
2134 block->max_framesize = unpack_uint32_(b, 3); b += 3;
2135 block->sample_rate = (unpack_uint32_(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4);
2136 block->channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
2137 block->bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 4) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1;
2138 block->total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64_(b+4, 4);
2139 memcpy(block->md5sum, b+8, 16);
2141 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2144 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Seek seek_cb, FLAC__StreamMetadata_Padding *block, unsigned block_length)
2146 (void)block; /* nothing to do; we don't care about reading the padding bytes */
2148 if(0 != seek_cb(handle, block_length, SEEK_CUR))
2149 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2151 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2154 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Application *block, unsigned block_length)
2156 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
2158 if(read_cb(block->id, 1, id_bytes, handle) != id_bytes)
2159 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2161 if(block_length < id_bytes)
2162 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2164 block_length -= id_bytes;
2166 if(block_length == 0) {
2170 if(0 == (block->data = malloc(block_length)))
2171 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2173 if(read_cb(block->data, 1, block_length, handle) != block_length)
2174 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2177 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2180 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_SeekTable *block, unsigned block_length)
2183 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
2185 FLAC__ASSERT(block_length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH == 0);
2187 block->num_points = block_length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
2189 if(block->num_points == 0)
2191 else if(0 == (block->points = safe_malloc_mul_2op_(block->num_points, /*times*/sizeof(FLAC__StreamMetadata_SeekPoint))))
2192 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2194 for(i = 0; i < block->num_points; i++) {
2195 if(read_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
2196 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2197 /* some MAGIC NUMBERs here */
2198 block->points[i].sample_number = unpack_uint64_(buffer, 8);
2199 block->points[i].stream_offset = unpack_uint64_(buffer+8, 8);
2200 block->points[i].frame_samples = unpack_uint32_(buffer+16, 2);
2203 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2206 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_entry_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment_Entry *entry)
2208 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
2209 FLAC__byte buffer[4]; /* magic number is asserted below */
2211 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8 == sizeof(buffer));
2213 if(read_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2214 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2215 entry->length = unpack_uint32_little_endian_(buffer, entry_length_len);
2217 if(0 != entry->entry)
2220 if(entry->length == 0) {
2224 if(0 == (entry->entry = safe_malloc_add_2op_(entry->length, /*+*/1)))
2225 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2227 if(read_cb(entry->entry, 1, entry->length, handle) != entry->length)
2228 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2230 entry->entry[entry->length] = '\0';
2233 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2236 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_VorbisComment *block)
2239 FLAC__Metadata_SimpleIteratorStatus status;
2240 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
2241 FLAC__byte buffer[4]; /* magic number is asserted below */
2243 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8 == sizeof(buffer));
2245 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, &(block->vendor_string))))
2248 if(read_cb(buffer, 1, num_comments_len, handle) != num_comments_len)
2249 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2250 block->num_comments = unpack_uint32_little_endian_(buffer, num_comments_len);
2252 if(block->num_comments == 0) {
2253 block->comments = 0;
2255 else if(0 == (block->comments = calloc(block->num_comments, sizeof(FLAC__StreamMetadata_VorbisComment_Entry))))
2256 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2258 for(i = 0; i < block->num_comments; i++) {
2259 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_vorbis_comment_entry_cb_(handle, read_cb, block->comments + i)))
2263 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2266 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_track_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet_Track *track)
2269 FLAC__byte buffer[32]; /* asserted below that this is big enough */
2271 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
2272 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
2273 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);
2275 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
2276 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
2277 if(read_cb(buffer, 1, len, handle) != len)
2278 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2279 track->offset = unpack_uint64_(buffer, len);
2281 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
2282 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
2283 if(read_cb(buffer, 1, len, handle) != len)
2284 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2285 track->number = (FLAC__byte)unpack_uint32_(buffer, len);
2287 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
2288 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
2289 if(read_cb(track->isrc, 1, len, handle) != len)
2290 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2292 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);
2293 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
2294 if(read_cb(buffer, 1, len, handle) != len)
2295 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2296 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN == 1);
2297 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN == 1);
2298 track->type = buffer[0] >> 7;
2299 track->pre_emphasis = (buffer[0] >> 6) & 1;
2301 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
2302 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
2303 if(read_cb(buffer, 1, len, handle) != len)
2304 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2305 track->num_indices = (FLAC__byte)unpack_uint32_(buffer, len);
2307 if(track->num_indices == 0) {
2310 else if(0 == (track->indices = calloc(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index))))
2311 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2313 for(i = 0; i < track->num_indices; i++) {
2314 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
2315 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
2316 if(read_cb(buffer, 1, len, handle) != len)
2317 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2318 track->indices[i].offset = unpack_uint64_(buffer, len);
2320 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
2321 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
2322 if(read_cb(buffer, 1, len, handle) != len)
2323 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2324 track->indices[i].number = (FLAC__byte)unpack_uint32_(buffer, len);
2326 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
2327 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
2328 if(read_cb(buffer, 1, len, handle) != len)
2329 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2332 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2335 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_CueSheet *block)
2338 FLAC__Metadata_SimpleIteratorStatus status;
2339 FLAC__byte buffer[1024]; /* MSVC needs a constant expression so we put a magic number and assert */
2341 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN)/8 <= sizeof(buffer));
2342 FLAC__ASSERT(sizeof(FLAC__uint64) <= sizeof(buffer));
2344 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
2345 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
2346 if(read_cb(block->media_catalog_number, 1, len, handle) != len)
2347 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2349 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
2350 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
2351 if(read_cb(buffer, 1, len, handle) != len)
2352 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2353 block->lead_in = unpack_uint64_(buffer, len);
2355 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
2356 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
2357 if(read_cb(buffer, 1, len, handle) != len)
2358 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2359 block->is_cd = buffer[0]&0x80? true : false;
2361 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
2362 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
2363 if(read_cb(buffer, 1, len, handle) != len)
2364 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2365 block->num_tracks = unpack_uint32_(buffer, len);
2367 if(block->num_tracks == 0) {
2370 else if(0 == (block->tracks = calloc(block->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track))))
2371 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2373 for(i = 0; i < block->num_tracks; i++) {
2374 if(FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK != (status = read_metadata_block_data_cuesheet_track_cb_(handle, read_cb, block->tracks + i)))
2378 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2381 static 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)
2383 FLAC__byte buffer[sizeof(FLAC__uint32)];
2385 FLAC__ASSERT(0 != data);
2386 FLAC__ASSERT(length_len%8 == 0);
2388 length_len /= 8; /* convert to bytes */
2390 FLAC__ASSERT(sizeof(buffer) >= length_len);
2392 if(read_cb(buffer, 1, length_len, handle) != length_len)
2393 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2394 *length = unpack_uint32_(buffer, length_len);
2399 if(0 == (*data = safe_malloc_add_2op_(*length, /*+*/1)))
2400 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2403 if(read_cb(*data, 1, *length, handle) != *length)
2404 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2407 (*data)[*length] = '\0';
2409 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2412 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Picture *block)
2414 FLAC__Metadata_SimpleIteratorStatus status;
2415 FLAC__byte buffer[4]; /* asserted below that this is big enough */
2418 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8);
2419 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8);
2420 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8);
2421 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8);
2422 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8);
2424 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_TYPE_LEN % 8 == 0);
2425 len = FLAC__STREAM_METADATA_PICTURE_TYPE_LEN / 8;
2426 if(read_cb(buffer, 1, len, handle) != len)
2427 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2428 block->type = (FLAC__StreamMetadata_Picture_Type)unpack_uint32_(buffer, len);
2430 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)
2433 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)
2436 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN % 8 == 0);
2437 len = FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN / 8;
2438 if(read_cb(buffer, 1, len, handle) != len)
2439 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2440 block->width = unpack_uint32_(buffer, len);
2442 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN % 8 == 0);
2443 len = FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN / 8;
2444 if(read_cb(buffer, 1, len, handle) != len)
2445 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2446 block->height = unpack_uint32_(buffer, len);
2448 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN % 8 == 0);
2449 len = FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN / 8;
2450 if(read_cb(buffer, 1, len, handle) != len)
2451 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2452 block->depth = unpack_uint32_(buffer, len);
2454 FLAC__ASSERT(FLAC__STREAM_METADATA_PICTURE_COLORS_LEN % 8 == 0);
2455 len = FLAC__STREAM_METADATA_PICTURE_COLORS_LEN / 8;
2456 if(read_cb(buffer, 1, len, handle) != len)
2457 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2458 block->colors = unpack_uint32_(buffer, len);
2460 /* for convenience we use read_metadata_block_data_picture_cstring_cb_() even though it adds an extra terminating NUL we don't use */
2461 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)
2464 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2467 FLAC__Metadata_SimpleIteratorStatus read_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__StreamMetadata_Unknown *block, unsigned block_length)
2469 if(block_length == 0) {
2473 if(0 == (block->data = malloc(block_length)))
2474 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2476 if(read_cb(block->data, 1, block_length, handle) != block_length)
2477 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
2480 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2483 FLAC__bool write_metadata_block_header_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
2485 FLAC__ASSERT(0 != file);
2486 FLAC__ASSERT(0 != status);
2488 if(!write_metadata_block_header_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) {
2489 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2496 FLAC__bool write_metadata_block_data_(FILE *file, FLAC__Metadata_SimpleIteratorStatus *status, const FLAC__StreamMetadata *block)
2498 FLAC__ASSERT(0 != file);
2499 FLAC__ASSERT(0 != status);
2501 if (write_metadata_block_data_cb_((FLAC__IOHandle)file, (FLAC__IOCallback_Write)fwrite, block)) {
2502 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK;
2506 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
2511 FLAC__bool write_metadata_block_header_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block)
2513 FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH];
2515 FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
2517 buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type;
2518 pack_uint32_(block->length, buffer + 1, 3);
2520 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_HEADER_LENGTH, handle) != FLAC__STREAM_METADATA_HEADER_LENGTH)
2526 FLAC__bool write_metadata_block_data_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata *block)
2528 FLAC__ASSERT(0 != block);
2530 switch(block->type) {
2531 case FLAC__METADATA_TYPE_STREAMINFO:
2532 return write_metadata_block_data_streaminfo_cb_(handle, write_cb, &block->data.stream_info);
2533 case FLAC__METADATA_TYPE_PADDING:
2534 return write_metadata_block_data_padding_cb_(handle, write_cb, &block->data.padding, block->length);
2535 case FLAC__METADATA_TYPE_APPLICATION:
2536 return write_metadata_block_data_application_cb_(handle, write_cb, &block->data.application, block->length);
2537 case FLAC__METADATA_TYPE_SEEKTABLE:
2538 return write_metadata_block_data_seektable_cb_(handle, write_cb, &block->data.seek_table);
2539 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
2540 return write_metadata_block_data_vorbis_comment_cb_(handle, write_cb, &block->data.vorbis_comment);
2541 case FLAC__METADATA_TYPE_CUESHEET:
2542 return write_metadata_block_data_cuesheet_cb_(handle, write_cb, &block->data.cue_sheet);
2543 case FLAC__METADATA_TYPE_PICTURE:
2544 return write_metadata_block_data_picture_cb_(handle, write_cb, &block->data.picture);
2546 return write_metadata_block_data_unknown_cb_(handle, write_cb, &block->data.unknown, block->length);
2550 FLAC__bool write_metadata_block_data_streaminfo_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_StreamInfo *block)
2552 FLAC__byte buffer[FLAC__STREAM_METADATA_STREAMINFO_LENGTH];
2553 const unsigned channels1 = block->channels - 1;
2554 const unsigned bps1 = block->bits_per_sample - 1;
2556 /* we are using hardcoded numbers for simplicity but we should
2557 * probably eventually write a bit-level packer and use the
2558 * _STREAMINFO_ constants.
2560 pack_uint32_(block->min_blocksize, buffer, 2);
2561 pack_uint32_(block->max_blocksize, buffer+2, 2);
2562 pack_uint32_(block->min_framesize, buffer+4, 3);
2563 pack_uint32_(block->max_framesize, buffer+7, 3);
2564 buffer[10] = (block->sample_rate >> 12) & 0xff;
2565 buffer[11] = (block->sample_rate >> 4) & 0xff;
2566 buffer[12] = ((block->sample_rate & 0x0f) << 4) | (channels1 << 1) | (bps1 >> 4);
2567 buffer[13] = (FLAC__byte)(((bps1 & 0x0f) << 4) | ((block->total_samples >> 32) & 0x0f));
2568 pack_uint32_((FLAC__uint32)block->total_samples, buffer+14, 4);
2569 memcpy(buffer+18, block->md5sum, 16);
2571 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_STREAMINFO_LENGTH, handle) != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
2577 FLAC__bool write_metadata_block_data_padding_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Padding *block, unsigned block_length)
2579 unsigned i, n = block_length;
2580 FLAC__byte buffer[1024];
2584 memset(buffer, 0, 1024);
2586 for(i = 0; i < n/1024; i++)
2587 if(write_cb(buffer, 1, 1024, handle) != 1024)
2592 if(write_cb(buffer, 1, n, handle) != n)
2598 FLAC__bool write_metadata_block_data_application_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Application *block, unsigned block_length)
2600 const unsigned id_bytes = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
2602 if(write_cb(block->id, 1, id_bytes, handle) != id_bytes)
2605 block_length -= id_bytes;
2607 if(write_cb(block->data, 1, block_length, handle) != block_length)
2613 FLAC__bool write_metadata_block_data_seektable_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_SeekTable *block)
2616 FLAC__byte buffer[FLAC__STREAM_METADATA_SEEKPOINT_LENGTH];
2618 for(i = 0; i < block->num_points; i++) {
2619 /* some MAGIC NUMBERs here */
2620 pack_uint64_(block->points[i].sample_number, buffer, 8);
2621 pack_uint64_(block->points[i].stream_offset, buffer+8, 8);
2622 pack_uint32_(block->points[i].frame_samples, buffer+16, 2);
2623 if(write_cb(buffer, 1, FLAC__STREAM_METADATA_SEEKPOINT_LENGTH, handle) != FLAC__STREAM_METADATA_SEEKPOINT_LENGTH)
2630 FLAC__bool write_metadata_block_data_vorbis_comment_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_VorbisComment *block)
2633 const unsigned entry_length_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN / 8;
2634 const unsigned num_comments_len = FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN / 8;
2635 FLAC__byte buffer[4]; /* magic number is asserted below */
2637 FLAC__ASSERT(max(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN, FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8 == sizeof(buffer));
2639 pack_uint32_little_endian_(block->vendor_string.length, buffer, entry_length_len);
2640 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2642 if(write_cb(block->vendor_string.entry, 1, block->vendor_string.length, handle) != block->vendor_string.length)
2645 pack_uint32_little_endian_(block->num_comments, buffer, num_comments_len);
2646 if(write_cb(buffer, 1, num_comments_len, handle) != num_comments_len)
2649 for(i = 0; i < block->num_comments; i++) {
2650 pack_uint32_little_endian_(block->comments[i].length, buffer, entry_length_len);
2651 if(write_cb(buffer, 1, entry_length_len, handle) != entry_length_len)
2653 if(write_cb(block->comments[i].entry, 1, block->comments[i].length, handle) != block->comments[i].length)
2660 FLAC__bool write_metadata_block_data_cuesheet_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_CueSheet *block)
2663 FLAC__byte buffer[1024]; /* asserted below that this is big enough */
2665 FLAC__ASSERT(sizeof(buffer) >= sizeof(FLAC__uint64));
2666 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN/8);
2667 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);
2668 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN/8);
2670 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
2671 len = FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN / 8;
2672 if(write_cb(block->media_catalog_number, 1, len, handle) != len)
2675 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN % 8 == 0);
2676 len = FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN / 8;
2677 pack_uint64_(block->lead_in, buffer, len);
2678 if(write_cb(buffer, 1, len, handle) != len)
2681 FLAC__ASSERT((FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) % 8 == 0);
2682 len = (FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN + FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN) / 8;
2683 memset(buffer, 0, len);
2686 if(write_cb(buffer, 1, len, handle) != len)
2689 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN % 8 == 0);
2690 len = FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN / 8;
2691 pack_uint32_(block->num_tracks, buffer, len);
2692 if(write_cb(buffer, 1, len, handle) != len)
2695 for(i = 0; i < block->num_tracks; i++) {
2696 FLAC__StreamMetadata_CueSheet_Track *track = block->tracks + i;
2698 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN % 8 == 0);
2699 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN / 8;
2700 pack_uint64_(track->offset, buffer, len);
2701 if(write_cb(buffer, 1, len, handle) != len)
2704 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN % 8 == 0);
2705 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN / 8;
2706 pack_uint32_(track->number, buffer, len);
2707 if(write_cb(buffer, 1, len, handle) != len)
2710 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
2711 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN / 8;
2712 if(write_cb(track->isrc, 1, len, handle) != len)
2715 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);
2716 len = (FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN + FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN) / 8;
2717 memset(buffer, 0, len);
2718 buffer[0] = (track->type << 7) | (track->pre_emphasis << 6);
2719 if(write_cb(buffer, 1, len, handle) != len)
2722 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN % 8 == 0);
2723 len = FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN / 8;
2724 pack_uint32_(track->num_indices, buffer, len);
2725 if(write_cb(buffer, 1, len, handle) != len)
2728 for(j = 0; j < track->num_indices; j++) {
2729 FLAC__StreamMetadata_CueSheet_Index *index = track->indices + j;
2731 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN % 8 == 0);
2732 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN / 8;
2733 pack_uint64_(index->offset, buffer, len);
2734 if(write_cb(buffer, 1, len, handle) != len)
2737 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN % 8 == 0);
2738 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN / 8;
2739 pack_uint32_(index->number, buffer, len);
2740 if(write_cb(buffer, 1, len, handle) != len)
2743 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN % 8 == 0);
2744 len = FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN / 8;
2745 memset(buffer, 0, len);
2746 if(write_cb(buffer, 1, len, handle) != len)
2754 FLAC__bool write_metadata_block_data_picture_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Picture *block)
2758 FLAC__byte buffer[4]; /* magic number is asserted below */
2760 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_TYPE_LEN%8);
2761 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN%8);
2762 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN%8);
2763 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN%8);
2764 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN%8);
2765 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN%8);
2766 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_COLORS_LEN%8);
2767 FLAC__ASSERT(0 == FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN%8);
2768 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8);
2769 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN/8);
2770 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN/8);
2771 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8);
2772 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8);
2773 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8);
2774 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8);
2775 FLAC__ASSERT(sizeof(buffer) >= FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN/8);
2777 len = FLAC__STREAM_METADATA_PICTURE_TYPE_LEN/8;
2778 pack_uint32_(block->type, buffer, len);
2779 if(write_cb(buffer, 1, len, handle) != len)
2782 len = FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN/8;
2783 slen = strlen(block->mime_type);
2784 pack_uint32_(slen, buffer, len);
2785 if(write_cb(buffer, 1, len, handle) != len)
2787 if(write_cb(block->mime_type, 1, slen, handle) != slen)
2790 len = FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN/8;
2791 slen = strlen((const char *)block->description);
2792 pack_uint32_(slen, buffer, len);
2793 if(write_cb(buffer, 1, len, handle) != len)
2795 if(write_cb(block->description, 1, slen, handle) != slen)
2798 len = FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN/8;
2799 pack_uint32_(block->width, buffer, len);
2800 if(write_cb(buffer, 1, len, handle) != len)
2803 len = FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN/8;
2804 pack_uint32_(block->height, buffer, len);
2805 if(write_cb(buffer, 1, len, handle) != len)
2808 len = FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN/8;
2809 pack_uint32_(block->depth, buffer, len);
2810 if(write_cb(buffer, 1, len, handle) != len)
2813 len = FLAC__STREAM_METADATA_PICTURE_COLORS_LEN/8;
2814 pack_uint32_(block->colors, buffer, len);
2815 if(write_cb(buffer, 1, len, handle) != len)
2818 len = FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN/8;
2819 pack_uint32_(block->data_length, buffer, len);
2820 if(write_cb(buffer, 1, len, handle) != len)
2822 if(write_cb(block->data, 1, block->data_length, handle) != block->data_length)
2828 FLAC__bool write_metadata_block_data_unknown_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Write write_cb, const FLAC__StreamMetadata_Unknown *block, unsigned block_length)
2830 if(write_cb(block->data, 1, block_length, handle) != block_length)
2836 FLAC__bool write_metadata_block_stationary_(FLAC__Metadata_SimpleIterator *iterator, const FLAC__StreamMetadata *block)
2838 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2839 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2843 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
2846 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
2849 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2850 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2854 return read_metadata_block_header_(iterator);
2857 FLAC__bool write_metadata_block_stationary_with_padding_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, unsigned padding_length, FLAC__bool padding_is_last)
2859 FLAC__StreamMetadata *padding;
2861 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2862 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2866 block->is_last = false;
2868 if(!write_metadata_block_header_(iterator->file, &iterator->status, block))
2871 if(!write_metadata_block_data_(iterator->file, &iterator->status, block))
2874 if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)))
2875 return FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
2877 padding->is_last = padding_is_last;
2878 padding->length = padding_length;
2880 if(!write_metadata_block_header_(iterator->file, &iterator->status, padding)) {
2881 FLAC__metadata_object_delete(padding);
2885 if(!write_metadata_block_data_(iterator->file, &iterator->status, padding)) {
2886 FLAC__metadata_object_delete(padding);
2890 FLAC__metadata_object_delete(padding);
2892 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2893 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2897 return read_metadata_block_header_(iterator);
2900 FLAC__bool rewrite_whole_file_(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool append)
2902 FILE *tempfile = NULL;
2903 char *tempfilename = NULL;
2904 int fixup_is_last_code = 0; /* 0 => no need to change any is_last flags */
2905 off_t fixup_is_last_flag_offset = -1;
2907 FLAC__ASSERT(0 != block || append == false);
2909 if(iterator->is_last) {
2911 fixup_is_last_code = 1; /* 1 => clear the is_last flag at the following offset */
2912 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2914 else if(0 == block) {
2915 simple_iterator_push_(iterator);
2916 if(!FLAC__metadata_simple_iterator_prev(iterator)) {
2917 (void)simple_iterator_pop_(iterator);
2920 fixup_is_last_code = -1; /* -1 => set the is_last the flag at the following offset */
2921 fixup_is_last_flag_offset = iterator->offset[iterator->depth];
2922 if(!simple_iterator_pop_(iterator))
2927 if(!simple_iterator_copy_file_prefix_(iterator, &tempfile, &tempfilename, append))
2931 if(!write_metadata_block_header_(tempfile, &iterator->status, block)) {
2932 cleanup_tempfile_(&tempfile, &tempfilename);
2936 if(!write_metadata_block_data_(tempfile, &iterator->status, block)) {
2937 cleanup_tempfile_(&tempfile, &tempfilename);
2942 if(!simple_iterator_copy_file_postfix_(iterator, &tempfile, &tempfilename, fixup_is_last_code, fixup_is_last_flag_offset, block==0))
2946 return FLAC__metadata_simple_iterator_next(iterator);
2951 void simple_iterator_push_(FLAC__Metadata_SimpleIterator *iterator)
2953 FLAC__ASSERT(iterator->depth+1 < SIMPLE_ITERATOR_MAX_PUSH_DEPTH);
2954 iterator->offset[iterator->depth+1] = iterator->offset[iterator->depth];
2958 FLAC__bool simple_iterator_pop_(FLAC__Metadata_SimpleIterator *iterator)
2960 FLAC__ASSERT(iterator->depth > 0);
2962 if(0 != fseeko(iterator->file, iterator->offset[iterator->depth], SEEK_SET)) {
2963 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
2967 return read_metadata_block_header_(iterator);
2974 * 3: not a FLAC file
2976 unsigned seek_to_first_metadata_block_cb_(FLAC__IOHandle handle, FLAC__IOCallback_Read read_cb, FLAC__IOCallback_Seek seek_cb)
2978 FLAC__byte buffer[4];
2982 FLAC__ASSERT(FLAC__STREAM_SYNC_LENGTH == sizeof(buffer));
2984 /* skip any id3v2 tag */
2986 n = read_cb(buffer, 1, 4, handle);
2991 else if(0 == memcmp(buffer, "ID3", 3)) {
2992 unsigned tag_length = 0;
2994 /* skip to the tag length */
2995 if(seek_cb(handle, 2, SEEK_CUR) < 0)
2998 /* read the length */
2999 for(i = 0; i < 4; i++) {
3000 if(read_cb(buffer, 1, 1, handle) < 1 || buffer[0] & 0x80)
3003 tag_length |= (buffer[0] & 0x7f);
3006 /* skip the rest of the tag */
3007 if(seek_cb(handle, tag_length, SEEK_CUR) < 0)
3010 /* read the stream sync code */
3012 n = read_cb(buffer, 1, 4, handle);
3019 /* check for the fLaC signature */
3020 if(0 == memcmp(FLAC__STREAM_SYNC_STRING, buffer, FLAC__STREAM_SYNC_LENGTH))
3026 unsigned seek_to_first_metadata_block_(FILE *f)
3028 return seek_to_first_metadata_block_cb_((FLAC__IOHandle)f, (FLAC__IOCallback_Read)fread, fseek_wrapper_);
3031 FLAC__bool simple_iterator_copy_file_prefix_(FLAC__Metadata_SimpleIterator *iterator, FILE **tempfile, char **tempfilename, FLAC__bool append)
3033 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];
3035 if(0 != fseeko(iterator->file, 0, SEEK_SET)) {
3036 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
3039 if(!open_tempfile_(iterator->filename, iterator->tempfile_path_prefix, tempfile, tempfilename, &iterator->status)) {
3040 cleanup_tempfile_(tempfile, tempfilename);
3043 if(!copy_n_bytes_from_file_(iterator->file, *tempfile, offset_end, &iterator->status)) {
3044 cleanup_tempfile_(tempfile, tempfilename);
3051 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)
3053 off_t save_offset = iterator->offset[iterator->depth];
3054 FLAC__ASSERT(0 != *tempfile);
3056 if(0 != fseeko(iterator->file, save_offset + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length, SEEK_SET)) {
3057 cleanup_tempfile_(tempfile, tempfilename);
3058 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
3061 if(!copy_remaining_bytes_from_file_(iterator->file, *tempfile, &iterator->status)) {
3062 cleanup_tempfile_(tempfile, tempfilename);
3066 if(fixup_is_last_code != 0) {
3068 * if code == 1, it means a block was appended to the end so
3069 * we have to clear the is_last flag of the previous block
3070 * if code == -1, it means the last block was deleted so
3071 * we have to set the is_last flag of the previous block
3073 /* MAGIC NUMBERs here; we know the is_last flag is the high bit of the byte at this location */
3075 if(0 != fseeko(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
3076 cleanup_tempfile_(tempfile, tempfilename);
3077 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
3080 if(fread(&x, 1, 1, *tempfile) != 1) {
3081 cleanup_tempfile_(tempfile, tempfilename);
3082 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3085 if(fixup_is_last_code > 0) {
3086 FLAC__ASSERT(x & 0x80);
3090 FLAC__ASSERT(!(x & 0x80));
3093 if(0 != fseeko(*tempfile, fixup_is_last_flag_offset, SEEK_SET)) {
3094 cleanup_tempfile_(tempfile, tempfilename);
3095 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR;
3098 if(local__fwrite(&x, 1, 1, *tempfile) != 1) {
3099 cleanup_tempfile_(tempfile, tempfilename);
3100 iterator->status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3105 (void)fclose(iterator->file);
3107 if(!transport_tempfile_(iterator->filename, tempfile, tempfilename, &iterator->status))
3110 if(iterator->has_stats)
3111 set_file_stats_(iterator->filename, &iterator->stats);
3113 if(!simple_iterator_prime_input_(iterator, !iterator->is_writable))
3116 while(iterator->offset[iterator->depth] + (off_t)FLAC__STREAM_METADATA_HEADER_LENGTH + (off_t)iterator->length < save_offset)
3117 if(!FLAC__metadata_simple_iterator_next(iterator))
3122 /* move the iterator to it's original block faster by faking a push, then doing a pop_ */
3123 FLAC__ASSERT(iterator->depth == 0);
3124 iterator->offset[0] = save_offset;
3126 return simple_iterator_pop_(iterator);
3130 FLAC__bool copy_n_bytes_from_file_(FILE *file, FILE *tempfile, off_t bytes, FLAC__Metadata_SimpleIteratorStatus *status)
3132 FLAC__byte buffer[8192];
3135 FLAC__ASSERT(bytes >= 0);
3137 n = min(sizeof(buffer), (size_t)bytes);
3138 if(fread(buffer, 1, n, file) != n) {
3139 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3142 if(local__fwrite(buffer, 1, n, tempfile) != n) {
3143 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3152 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)
3154 FLAC__byte buffer[8192];
3157 FLAC__ASSERT(bytes >= 0);
3159 n = min(sizeof(buffer), (size_t)bytes);
3160 if(read_cb(buffer, 1, n, handle) != n) {
3161 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3164 if(temp_write_cb(buffer, 1, n, temp_handle) != n) {
3165 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3174 FLAC__bool copy_remaining_bytes_from_file_(FILE *file, FILE *tempfile, FLAC__Metadata_SimpleIteratorStatus *status)
3176 FLAC__byte buffer[8192];
3179 while(!feof(file)) {
3180 n = fread(buffer, 1, sizeof(buffer), file);
3181 if(n == 0 && !feof(file)) {
3182 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3185 if(n > 0 && local__fwrite(buffer, 1, n, tempfile) != n) {
3186 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3194 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)
3196 FLAC__byte buffer[8192];
3199 while(!eof_cb(handle)) {
3200 n = read_cb(buffer, 1, sizeof(buffer), handle);
3201 if(n == 0 && !eof_cb(handle)) {
3202 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR;
3205 if(n > 0 && temp_write_cb(buffer, 1, n, temp_handle) != n) {
3206 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR;
3214 FLAC__bool open_tempfile_(const char *filename, const char *tempfile_path_prefix, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
3216 static const char *tempfile_suffix = ".metadata_edit";
3217 if(0 == tempfile_path_prefix) {
3218 if(0 == (*tempfilename = safe_malloc_add_3op_(strlen(filename), /*+*/strlen(tempfile_suffix), /*+*/1))) {
3219 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
3222 strcpy(*tempfilename, filename);
3223 strcat(*tempfilename, tempfile_suffix);
3226 const char *p = strrchr(filename, '/');
3232 if(0 == (*tempfilename = safe_malloc_add_4op_(strlen(tempfile_path_prefix), /*+*/strlen(p), /*+*/strlen(tempfile_suffix), /*+*/2))) {
3233 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR;
3236 strcpy(*tempfilename, tempfile_path_prefix);
3237 strcat(*tempfilename, "/");
3238 strcat(*tempfilename, p);
3239 strcat(*tempfilename, tempfile_suffix);
3242 if(0 == (*tempfile = fopen(*tempfilename, "w+b"))) {
3243 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE;
3250 FLAC__bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename, FLAC__Metadata_SimpleIteratorStatus *status)
3252 FLAC__ASSERT(0 != filename);
3253 FLAC__ASSERT(0 != tempfile);
3254 FLAC__ASSERT(0 != *tempfile);
3255 FLAC__ASSERT(0 != tempfilename);
3256 FLAC__ASSERT(0 != *tempfilename);
3257 FLAC__ASSERT(0 != status);
3259 (void)fclose(*tempfile);
3262 #if defined _MSC_VER || defined __BORLANDC__ || defined __MINGW32__ || defined __EMX__
3263 /* on some flavors of windows, rename() will fail if the destination already exists */
3264 if(unlink(filename) < 0) {
3265 cleanup_tempfile_(tempfile, tempfilename);
3266 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR;
3271 /*@@@ to fully support the tempfile_path_prefix we need to update this piece to actually copy across filesystems instead of just rename(): */
3272 if(0 != rename(*tempfilename, filename)) {
3273 cleanup_tempfile_(tempfile, tempfilename);
3274 *status = FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR;
3278 cleanup_tempfile_(tempfile, tempfilename);
3283 void cleanup_tempfile_(FILE **tempfile, char **tempfilename)
3285 if(0 != *tempfile) {
3286 (void)fclose(*tempfile);
3290 if(0 != *tempfilename) {
3291 (void)unlink(*tempfilename);
3292 free(*tempfilename);
3297 FLAC__bool get_file_stats_(const char *filename, struct stat *stats)
3299 FLAC__ASSERT(0 != filename);
3300 FLAC__ASSERT(0 != stats);
3301 return (0 == stat(filename, stats));
3304 void set_file_stats_(const char *filename, struct stat *stats)
3306 struct utimbuf srctime;
3308 FLAC__ASSERT(0 != filename);
3309 FLAC__ASSERT(0 != stats);
3311 srctime.actime = stats->st_atime;
3312 srctime.modtime = stats->st_mtime;
3313 (void)chmod(filename, stats->st_mode);
3314 (void)utime(filename, &srctime);
3315 #if !defined _MSC_VER && !defined __BORLANDC__ && !defined __MINGW32__
3316 (void)chown(filename, stats->st_uid, -1);
3317 (void)chown(filename, -1, stats->st_gid);
3321 int fseek_wrapper_(FLAC__IOHandle handle, FLAC__int64 offset, int whence)
3323 return fseeko((FILE*)handle, (off_t)offset, whence);
3326 FLAC__int64 ftell_wrapper_(FLAC__IOHandle handle)
3328 return ftello((FILE*)handle);
3331 FLAC__Metadata_ChainStatus get_equivalent_status_(FLAC__Metadata_SimpleIteratorStatus status)
3334 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK:
3335 return FLAC__METADATA_CHAIN_STATUS_OK;
3336 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT:
3337 return FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT;
3338 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE:
3339 return FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE;
3340 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE:
3341 return FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE;
3342 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE:
3343 return FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE;
3344 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA:
3345 return FLAC__METADATA_CHAIN_STATUS_BAD_METADATA;
3346 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR:
3347 return FLAC__METADATA_CHAIN_STATUS_READ_ERROR;
3348 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR:
3349 return FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR;
3350 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR:
3351 return FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR;
3352 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR:
3353 return FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR;
3354 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR:
3355 return FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR;
3356 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR:
3357 return FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
3358 case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR:
3360 return FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR;