1 /*
2 * flac123 a command-line flac player
3 * Copyright (C) 2003-2007 Jake Angerman
4 *
5 * This vorbiscomment.c module heavily based upon:
6 * plugin_common - Routines common to several xmms plugins
7 * Copyright (C) 2002,2003 Josh Coalson
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
22 */
23
24 #include <string.h>
25 #include <strings.h>
26 #include <stdlib.h>
27
28 #include "flac123.h"
29
local__vcentry_matches(const char * field_name,const FLAC__StreamMetadata_VorbisComment_Entry * entry)30 static int local__vcentry_matches(const char *field_name, const FLAC__StreamMetadata_VorbisComment_Entry *entry)
31 {
32 const FLAC__byte *eq = memchr(entry->entry, '=', entry->length);
33 const unsigned field_name_length = strlen(field_name);
34 return (0 != eq && (unsigned)(eq-entry->entry) == field_name_length && 0 == strncasecmp(field_name, entry->entry, field_name_length));
35 }
36
37 /* parse a string entry and put it into dest which is of size len.
38 * len is the width of non-null bytes.
39 */
local__vcentry_parse_value(const FLAC__StreamMetadata_VorbisComment_Entry * entry,char * dest,int len)40 static void local__vcentry_parse_value(const FLAC__StreamMetadata_VorbisComment_Entry *entry, char *dest, int len)
41 {
42 const FLAC__byte * const eq = memchr(entry->entry, '=', entry->length);
43
44 if(!eq || !dest)
45 return;
46 else {
47 unsigned value_length = entry->length - (unsigned)((eq+1) - entry->entry);
48 if(value_length > len) {
49 value_length = len;
50 }
51
52 memset(dest, ' ', len);
53 memcpy(dest, eq+1, value_length);
54 dest[len] = '\0'; /* assumes char dest[len+1] */
55 }
56 }
57
get_vorbis_comments(const char * filename)58 FLAC__bool get_vorbis_comments(const char *filename)
59 {
60 FLAC__Metadata_SimpleIterator *iterator = FLAC__metadata_simple_iterator_new();
61 FLAC__bool got_vorbis_comments = false;
62
63 if(0 != iterator) {
64 if(FLAC__metadata_simple_iterator_init(iterator, filename, /*read_only=*/true, /*preserve_file_stats=*/true)) {
65 do {
66 if(FLAC__metadata_simple_iterator_get_block_type(iterator) == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
67 FLAC__StreamMetadata *block = FLAC__metadata_simple_iterator_get_block(iterator);
68 if(0 != block) {
69 int i;
70 const FLAC__StreamMetadata_VorbisComment *vc = &block->data.vorbis_comment;
71 for(i = 0; i < vc->num_comments; i++) {
72 if(local__vcentry_matches("artist", &vc->comments[i]))
73 {
74 local__vcentry_parse_value(&vc->comments[i], file_info.artist, VORBIS_TAG_LEN);
75 got_vorbis_comments = true;
76 }
77 else if(local__vcentry_matches("album", &vc->comments[i]))
78 {
79 local__vcentry_parse_value(&vc->comments[i], file_info.album, VORBIS_TAG_LEN);
80 got_vorbis_comments = true;
81 }
82 else if(local__vcentry_matches("title", &vc->comments[i]))
83 {
84 local__vcentry_parse_value(&vc->comments[i], file_info.title, VORBIS_TAG_LEN);
85 got_vorbis_comments = true;
86 }
87 else if(local__vcentry_matches("genre", &vc->comments[i]))
88 {
89 local__vcentry_parse_value(&vc->comments[i], file_info.genre, VORBIS_TAG_LEN);
90 got_vorbis_comments = true;
91 }
92 else if(local__vcentry_matches("description", &vc->comments[i]))
93 {
94 local__vcentry_parse_value(&vc->comments[i], file_info.comment, VORBIS_TAG_LEN);
95 got_vorbis_comments = true;
96 }
97 else if(local__vcentry_matches("date", &vc->comments[i]))
98 {
99 local__vcentry_parse_value(&vc->comments[i], file_info.year, VORBIS_YEAR_LEN);
100 got_vorbis_comments = true;
101 }
102 }
103 FLAC__metadata_object_delete(block);
104 }
105 }
106 } while (!got_vorbis_comments && FLAC__metadata_simple_iterator_next(iterator));
107 }
108 FLAC__metadata_simple_iterator_delete(iterator);
109 }
110 return got_vorbis_comments;
111 }
112