src/plugin_common/vorbiscomment.c

   1 /* plugin_common - Routines common to several plugins
   2  * Copyright (C) 2002  Josh Coalson
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #include <string.h>
  20 #include <stdlib.h>
  21
  22 #include "vorbiscomment.h"
  23 #include "FLAC/metadata.h"
  24
  25 static int local__vcentry_matches(const char *field_name, const FLAC__StreamMetadata_VorbisComment_Entry *entry)
  26 {
  27         const FLAC__byte *eq = memchr(entry->entry, '=', entry->length);
  28         const unsigned field_name_length = strlen(field_name);
  29         return (0 != eq && (unsigned)(eq-entry->entry) == field_name_length && 0 == strncasecmp(field_name, entry->entry, field_name_length));
  30 }
  31
  32 static void local__vcentry_parse_value(const FLAC__StreamMetadata_VorbisComment_Entry *entry, char **dest)
  33 {
  34         const FLAC__byte *eq = memchr(entry->entry, '=', entry->length);
  35
  36         if(0 == eq)
  37                 return;
  38         else {
  39                 const unsigned value_length = entry->length - (unsigned)((++eq) - entry->entry);
  40
  41                 *dest = malloc(value_length + 1);
  42                 if(0 != *dest) {
  43                         memcpy(*dest, eq, value_length);
  44                         (*dest)[value_length] = '\0';
  45                 }
  46         }
  47 }
  48
  49 void FLAC_plugin__vorbiscomment_get(const char *filename, FLAC_Plugin__CanonicalTag *tag)
  50 {
  51         FLAC__Metadata_SimpleIterator *iterator = FLAC__metadata_simple_iterator_new();
  52         if(0 != iterator) {
  53                 if(FLAC__metadata_simple_iterator_init(iterator, filename, /*read_only=*/true, /*preserve_file_stats=*/true)) {
  54                         FLAC__bool got_vorbis_comments = false;
  55                         do {
  56                                 if(FLAC__metadata_simple_iterator_get_block_type(iterator) == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
  57                                         FLAC__StreamMetadata *block = FLAC__metadata_simple_iterator_get_block(iterator);
  58                                         if(0 != block) {
  59                                                 unsigned i;
  60                                                 const FLAC__StreamMetadata_VorbisComment *vc = &block->data.vorbis_comment;
  61                                                 for(i = 0; i < vc->num_comments; i++) {
  62                                                         if(local__vcentry_matches("artist", &vc->comments[i]))
  63                                                                 local__vcentry_parse_value(&vc->comments[i], &tag->composer);
  64                                                         else if(local__vcentry_matches("performer", &vc->comments[i]))
  65                                                                 local__vcentry_parse_value(&vc->comments[i], &tag->performer);
  66                                                         else if(local__vcentry_matches("album", &vc->comments[i]))
  67                                                                 local__vcentry_parse_value(&vc->comments[i], &tag->album);
  68                                                         else if(local__vcentry_matches("title", &vc->comments[i]))
  69                                                                 local__vcentry_parse_value(&vc->comments[i], &tag->title);
  70                                                         else if(local__vcentry_matches("tracknumber", &vc->comments[i]))
  71                                                                 local__vcentry_parse_value(&vc->comments[i], &tag->track_number);
  72                                                         else if(local__vcentry_matches("genre", &vc->comments[i]))
  73                                                                 local__vcentry_parse_value(&vc->comments[i], &tag->genre);
  74                                                         else if(local__vcentry_matches("description", &vc->comments[i]))
  75                                                                 local__vcentry_parse_value(&vc->comments[i], &tag->comment);
  76                                                 }
  77                                                 FLAC__metadata_object_delete(block);
  78                                                 got_vorbis_comments = true;
  79                                         }
  80                                 }
  81                         } while (!got_vorbis_comments && FLAC__metadata_simple_iterator_next(iterator));
  82                 }
  83                 FLAC__metadata_simple_iterator_delete(iterator);
  84         }
  85 }