src/plugin_common/canonical_tag.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 <stdlib.h>
  20 #include <stdio.h>
  21
  22 #include "canonical_tag.h"
  23 #include "id3v2.h"
  24 #include "vorbiscomment.h"
  25 #include "FLAC/assert.h"
  26 #include "FLAC/metadata.h"
  27
  28 static void local__safe_free(void *object)
  29 {
  30         if(0 != object)
  31                 free(object);
  32 }
  33
  34 static void local__copy_field(char **dest, const char *src, unsigned n)
  35 {
  36         if(n > 0) {
  37                 const char *p = src + n;
  38                 while(p > src && *(--p) == ' ')
  39                         ;
  40                 n = p - src + 1;
  41                 if(0 != (*dest = malloc(n+1))) {
  42                         memcpy(*dest, src, n);
  43                         (*dest)[n] = '\0';
  44                 }
  45         }
  46         else
  47                 *dest = 0;
  48 }
  49
  50 static FLAC__bool local__get_id3v1_tag_as_canonical(const char *filename, FLAC_Plugin__CanonicalTag *tag)
  51 {
  52         FLAC_Plugin__Id3v1_Tag id3v1_tag;
  53
  54         if(FLAC_plugin__id3v1_tag_get(filename, &id3v1_tag)) {
  55                 FLAC_plugin__canonical_tag_convert_from_id3v1(tag, &id3v1_tag);
  56                 return true;
  57         }
  58         return false;
  59 }
  60
  61 FLAC_Plugin__CanonicalTag *FLAC_plugin__canonical_tag_new()
  62 {
  63         FLAC_Plugin__CanonicalTag *object = (FLAC_Plugin__CanonicalTag*)malloc(sizeof(FLAC_Plugin__CanonicalTag));
  64         if(0 != object)
  65                 FLAC_plugin__canonical_tag_init(object);
  66         return object;
  67 }
  68
  69 void FLAC_plugin__canonical_tag_delete(FLAC_Plugin__CanonicalTag *object)
  70 {
  71         FLAC__ASSERT(0 != object);
  72         FLAC_plugin__canonical_tag_clear(object);
  73         free(object);
  74 }
  75
  76 void FLAC_plugin__canonical_tag_init(FLAC_Plugin__CanonicalTag *object)
  77 {
  78         FLAC__ASSERT(0 != object);
  79         object->title = 0;
  80         object->composer = 0;
  81         object->performer = 0;
  82         object->album = 0;
  83         object->year_recorded = 0;
  84         object->year_performed = 0;
  85         object->track_number = 0;
  86         object->tracks_in_album = 0;
  87         object->genre = 0;
  88         object->comment = 0;
  89 }
  90
  91 void FLAC_plugin__canonical_tag_clear(FLAC_Plugin__CanonicalTag *object)
  92 {
  93         FLAC__ASSERT(0 != object);
  94         local__safe_free(object->title);
  95         local__safe_free(object->composer);
  96         local__safe_free(object->performer);
  97         local__safe_free(object->album);
  98         local__safe_free(object->year_recorded);
  99         local__safe_free(object->year_performed);
 100         local__safe_free(object->track_number);
 101         local__safe_free(object->tracks_in_album);
 102         local__safe_free(object->genre);
 103         local__safe_free(object->comment);
 104         FLAC_plugin__canonical_tag_init(object);
 105 }
 106
 107 static void local__grab(char **dest, char **src)
 108 {
 109         if(0 == *dest) {
 110                 *dest = *src;
 111                 *src = 0;
 112         }
 113 }
 114
 115 void FLAC_plugin__canonical_tag_merge(FLAC_Plugin__CanonicalTag *dest, FLAC_Plugin__CanonicalTag *src)
 116 {
 117         local__grab(&dest->title, &src->title);
 118         local__grab(&dest->composer, &src->composer);
 119         local__grab(&dest->performer, &src->performer);
 120         local__grab(&dest->album, &src->album);
 121         local__grab(&dest->year_recorded, &src->year_recorded);
 122         local__grab(&dest->year_performed, &src->year_performed);
 123         local__grab(&dest->track_number, &src->track_number);
 124         local__grab(&dest->tracks_in_album, &src->tracks_in_album);
 125         local__grab(&dest->genre, &src->genre);
 126         local__grab(&dest->comment, &src->comment);
 127 }
 128
 129 void FLAC_plugin__canonical_tag_convert_from_id3v1(FLAC_Plugin__CanonicalTag *object, const FLAC_Plugin__Id3v1_Tag *id3v1_tag)
 130 {
 131         local__copy_field(&object->title, id3v1_tag->title, 30);
 132         local__copy_field(&object->composer, id3v1_tag->artist, 30);
 133         local__copy_field(&object->performer, id3v1_tag->artist, 30);
 134         local__copy_field(&object->album, id3v1_tag->album, 30);
 135         local__copy_field(&object->year_performed, id3v1_tag->year, 4);
 136
 137         /* Check for v1.1 tags. */
 138         if (id3v1_tag->comment.v1_1.zero == 0) {
 139                 if(0 != (object->track_number = malloc(4)))
 140                         sprintf(object->track_number, "%u", (unsigned)id3v1_tag->comment.v1_1.track);
 141                 local__copy_field(&object->comment, id3v1_tag->comment.v1_1.comment, 28);
 142         }
 143         else {
 144                 object->track_number = strdup("0");
 145                 local__copy_field(&object->comment, id3v1_tag->comment.v1_0.comment, 30);
 146         }
 147
 148         object->genre = strdup(FLAC_plugin__id3v1_tag_get_genre_as_string(id3v1_tag->genre));
 149 }
 150
 151 void FLAC_plugin__canonical_tag_get_combined(const char *filename, FLAC_Plugin__CanonicalTag *tag)
 152 {
 153         FLAC_Plugin__CanonicalTag id3v1_tag, id3v2_tag;
 154
 155         FLAC_plugin__vorbiscomment_get(filename, tag);
 156
 157         FLAC_plugin__canonical_tag_init(&id3v2_tag);
 158         (void)FLAC_plugin__id3v2_tag_get(filename, &id3v2_tag);
 159
 160         FLAC_plugin__canonical_tag_init(&id3v1_tag);
 161         (void)local__get_id3v1_tag_as_canonical(filename, &id3v1_tag);
 162
 163         /* merge tags, preferring, in order: vorbis comments, id3v2, id3v1 */
 164         FLAC_plugin__canonical_tag_merge(tag, &id3v2_tag);
 165         FLAC_plugin__canonical_tag_merge(tag, &id3v1_tag);
 166
 167         FLAC_plugin__canonical_tag_clear(&id3v1_tag);
 168         FLAC_plugin__canonical_tag_clear(&id3v2_tag);
 169 }