src/metadataChunk.c

   1 /* the Music Player Daemon (MPD)
   2  * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
   3  * This project's homepage is: http://www.musicpd.org
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  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 "metadataChunk.h"
  20 #include "gcc.h"
  21
  22 #include <string.h>
  23
  24 static void initMetadataChunk(MetadataChunk * chunk)
  25 {
  26         chunk->name = -1;
  27         chunk->artist = -1;
  28         chunk->album = -1;
  29         chunk->title = -1;
  30 }
  31
  32 #define dupElementToTag(item, element) { \
  33         if(element >= 0 && element < METADATA_BUFFER_LENGTH) { \
  34                 addItemToMpdTag(ret, item, chunk->buffer+element); \
  35         } \
  36 }
  37
  38 MpdTag *metadataChunkToMpdTagDup(MetadataChunk * chunk)
  39 {
  40         MpdTag *ret = newMpdTag();
  41
  42         chunk->buffer[METADATA_BUFFER_LENGTH - 1] = '\0';
  43
  44         dupElementToTag(TAG_ITEM_NAME, chunk->name);
  45         dupElementToTag(TAG_ITEM_TITLE, chunk->title);
  46         dupElementToTag(TAG_ITEM_ARTIST, chunk->artist);
  47         dupElementToTag(TAG_ITEM_ALBUM, chunk->album);
  48
  49         return ret;
  50 }
  51
  52 #define copyStringToChunk(string, element) { \
  53         if(element < 0 && string && (slen = strlen(string)) && \
  54                         pos < METADATA_BUFFER_LENGTH-1) \
  55         { \
  56                 size_t len = slen; \
  57                 size_t max = METADATA_BUFFER_LENGTH - 1 - pos; \
  58                 if (mpd_unlikely(len > max)) \
  59                         len = max; \
  60                 memcpy(chunk->buffer+pos, string, len); \
  61                 *(chunk->buffer+pos+len) = '\0'; \
  62                 element = pos; \
  63                 pos += slen+1; \
  64         } \
  65 }
  66
  67 void copyMpdTagToMetadataChunk(MpdTag * tag, MetadataChunk * chunk)
  68 {
  69         int pos = 0;
  70         int slen;
  71         int i;
  72
  73         initMetadataChunk(chunk);
  74
  75         if (!tag)
  76                 return;
  77
  78         for (i = 0; i < tag->numOfItems; i++) {
  79                 switch (tag->items[i].type) {
  80                 case TAG_ITEM_NAME:
  81                         copyStringToChunk(tag->items[i].value, chunk->name);
  82                         break;
  83                 case TAG_ITEM_TITLE:
  84                         copyStringToChunk(tag->items[i].value, chunk->title);
  85                         break;
  86                 case TAG_ITEM_ARTIST:
  87                         copyStringToChunk(tag->items[i].value, chunk->artist);
  88                         break;
  89                 case TAG_ITEM_ALBUM:
  90                         copyStringToChunk(tag->items[i].value, chunk->album);
  91                         break;
  92                 }
  93         }
  94 }