apps/metadata/vorbis.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 Dave Chapman
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19 #include <stdio.h>
  20 #include <string.h>
  21 #include <stdlib.h>
  22 #include <ctype.h>
  23 #include <inttypes.h>
  24
  25 #include "system.h"
  26 #include "id3.h"
  27 #include "metadata_common.h"
  28 #include "metadata_parsers.h"
  29 #include "structec.h"
  30 #include "logf.h"
  31
  32 /* Read the items in a Vorbis comment packet. Returns true the items were
  33  * fully read, false otherwise.
  34  */
  35 bool read_vorbis_tags(int fd, struct mp3entry *id3,
  36     long tag_remaining)
  37 {
  38     char *buf = id3->id3v2buf;
  39     int32_t comment_count;
  40     int32_t len;
  41     int buf_remaining = sizeof(id3->id3v2buf) + sizeof(id3->id3v1buf);
  42     int i;
  43
  44     if (ecread(fd, &len, 1, "l", IS_BIG_ENDIAN) < (long) sizeof(len))
  45     {
  46         return false;
  47     }
  48
  49     if ((lseek(fd, len, SEEK_CUR) < 0)
  50         || (ecread(fd, &comment_count, 1, "l", IS_BIG_ENDIAN)
  51             < (long) sizeof(comment_count)))
  52     {
  53         return false;
  54     }
  55
  56     tag_remaining -= len + sizeof(len) + sizeof(comment_count);
  57
  58     if (tag_remaining <= 0)
  59     {
  60         return true;
  61     }
  62
  63     for (i = 0; i < comment_count; i++)
  64     {
  65         char name[TAG_NAME_LENGTH];
  66         char value[TAG_VALUE_LENGTH];
  67         int32_t read_len;
  68
  69         if (tag_remaining < 4)
  70         {
  71             break;
  72         }
  73
  74         if (ecread(fd, &len, 1, "l", IS_BIG_ENDIAN) < (long) sizeof(len))
  75         {
  76             return false;
  77         }
  78
  79         tag_remaining -= 4;
  80
  81         /* Quit if we've passed the end of the page */
  82         if (tag_remaining < len)
  83         {
  84             break;
  85         }
  86
  87         tag_remaining -= len;
  88         read_len = read_string(fd, name, sizeof(name), '=', len);
  89
  90         if (read_len < 0)
  91         {
  92             return false;
  93         }
  94
  95         len -= read_len;
  96
  97         if (read_string(fd, value, sizeof(value), -1, len) < 0)
  98         {
  99             return false;
 100         }
 101
 102         len = parse_tag(name, value, id3, buf, buf_remaining,
 103             TAGTYPE_VORBIS);
 104         buf += len;
 105         buf_remaining -= len;
 106     }
 107
 108     /* Skip to the end of the block */
 109     if (tag_remaining)
 110     {
 111         if (lseek(fd, tag_remaining, SEEK_CUR) < 0)
 112         {
 113             return false;
 114         }
 115     }
 116
 117     return true;
 118 }