interpretor/libsndfile-1.0.25/src/id3.c

   1 /*
   2 ** Copyright (C) 2010-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
   3 **
   4 ** This program is free software; you can redistribute it and/or modify
   5 ** it under the terms of the GNU Lesser General Public License as published by
   6 ** the Free Software Foundation; either version 2.1 of the License, or
   7 ** (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 Lesser General Public License for more details.
  13 **
  14 ** You should have received a copy of the GNU Lesser 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        "sfconfig.h"
  20
  21 #include        <stdio.h>
  22 #include        <fcntl.h>
  23 #include        <string.h>
  24 #include        <ctype.h>
  25
  26 #include        "sndfile.h"
  27 #include        "sfendian.h"
  28 #include        "common.h"
  29
  30 int
  31 id3_skip (SF_PRIVATE * psf)
  32 {       unsigned char   buf [10] ;
  33
  34         memset (buf, 0, sizeof (buf)) ;
  35         psf_binheader_readf (psf, "pb", 0, buf, 10) ;
  36
  37         if (buf [0] == 'I' && buf [1] == 'D' && buf [2] == '3')
  38         {       int     offset = buf [6] & 0x7f ;
  39                 offset = (offset << 7) | (buf [7] & 0x7f) ;
  40                 offset = (offset << 7) | (buf [8] & 0x7f) ;
  41                 offset = (offset << 7) | (buf [9] & 0x7f) ;
  42
  43                 psf_binheader_readf (psf, "j", make_size_t (offset)) ;
  44
  45                 psf_log_printf (psf, "ID3 length : %d\n--------------------\n", offset) ;
  46
  47                 psf->fileoffset = 10 + offset ;
  48                 return 1 ;
  49                 } ;
  50
  51         return 0 ;
  52 } /* id3_skip */