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/*
This file is part of libextractor.
(C) 2002, 2003, 2004, 2006, 2009 Vidyut Samanta and Christian Grothoff
libextractor is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, or (at your
option) any later version.
libextractor is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with libextractor; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include "platform.h"
#include "extractor.h"
#ifndef MINGW
#include <sys/mman.h>
#endif
#include "convert.h"
#define DEBUG_EXTRACT_ID3v2 0
typedef struct
{
const char *text;
enum EXTRACTOR_MetaType type;
} Matches;
static Matches tmap[] = {
{"TAL", EXTRACTOR_METATYPE_TITLE},
{"TT1", EXTRACTOR_METATYPE_GROUP},
{"TT2", EXTRACTOR_METATYPE_TITLE},
{"TT3", EXTRACTOR_METATYPE_TITLE},
{"TXT", EXTRACTOR_METATYPE_DESCRIPTION},
{"TPB", EXTRACTOR_METATYPE_PUBLISHER},
{"WAF", EXTRACTOR_METATYPE_LOCATION},
{"WAR", EXTRACTOR_METATYPE_LOCATION},
{"WAS", EXTRACTOR_METATYPE_LOCATION},
{"WCP", EXTRACTOR_METATYPE_COPYRIGHT},
{"WAF", EXTRACTOR_METATYPE_LOCATION},
{"WCM", EXTRACTOR_METATYPE_DISCLAIMER},
{"TSS", EXTRACTOR_METATYPE_FORMAT},
{"TYE", EXTRACTOR_METATYPE_DATE},
{"TLA", EXTRACTOR_METATYPE_LANGUAGE},
{"TP1", EXTRACTOR_METATYPE_ARTIST},
{"TP2", EXTRACTOR_METATYPE_ARTIST},
{"TP3", EXTRACTOR_METATYPE_CONDUCTOR},
{"TP4", EXTRACTOR_METATYPE_INTERPRET},
{"IPL", EXTRACTOR_METATYPE_CONTRIBUTOR},
{"TOF", EXTRACTOR_METATYPE_FILENAME},
{"TEN", EXTRACTOR_METATYPE_PRODUCER},
{"TCO", EXTRACTOR_METATYPE_SUBJECT},
{"TCR", EXTRACTOR_METATYPE_COPYRIGHT},
{"SLT", EXTRACTOR_METATYPE_LYRICS},
{"TOA", EXTRACTOR_METATYPE_ARTIST},
{"TRC", EXTRACTOR_METATYPE_ISRC},
{"TRK", EXTRACTOR_METATYPE_TRACK_NUMBER},
{"TCM", EXTRACTOR_METATYPE_CREATOR},
{"TOT", EXTRACTOR_METATYPE_ALBUM},
{"TOL", EXTRACTOR_METATYPE_AUTHOR},
{"COM", EXTRACTOR_METATYPE_COMMENT},
{"", EXTRACTOR_METATYPE_KEYWORDS},
{NULL, 0},
};
/* mimetype = audio/mpeg */
int
EXTRACTOR_id3v2_extract (const unsigned char *data,
size_t size,
EXTRACTOR_MetaDataProcessor proc,
void *proc_cls,
const char *options)
{
int unsync;
unsigned int tsize;
unsigned int pos;
if ((size < 16) ||
(data[0] != 0x49) ||
(data[1] != 0x44) ||
(data[2] != 0x33) || (data[3] != 0x02) || (data[4] != 0x00))
return 0;
unsync = (data[5] & 0x80) > 0;
tsize = (((data[6] & 0x7F) << 21) |
((data[7] & 0x7F) << 14) |
((data[8] & 0x7F) << 07) | ((data[9] & 0x7F) << 00));
if (tsize + 10 > size)
return 0;
pos = 10;
while (pos < tsize)
{
size_t csize;
int i;
if (pos + 6 > tsize)
return 0;
csize = (data[pos + 3] << 16) + (data[pos + 4] << 8) + data[pos + 5];
if ((pos + 6 + csize > tsize) || (csize > tsize) || (csize == 0))
break;
i = 0;
while (tmap[i].text != NULL)
{
if (0 == strncmp (tmap[i].text, (const char *) &data[pos], 3))
{
char *word;
/* this byte describes the encoding
try to convert strings to UTF-8
if it fails, then forget it */
switch (data[pos + 6])
{
case 0x00:
word = EXTRACTOR_common_convert_to_utf8 ((const char *) &data[pos + 7],
csize, "ISO-8859-1");
break;
case 0x01:
word = EXTRACTOR_common_convert_to_utf8 ((const char *) &data[pos + 7],
csize, "UCS-2");
break;
default:
/* bad encoding byte,
try to convert from iso-8859-1 */
word = EXTRACTOR_common_convert_to_utf8 ((const char *) &data[pos + 7],
csize, "ISO-8859-1");
break;
}
pos++;
csize--;
if ((word != NULL) && (strlen (word) > 0))
{
prev = addKeyword (prev, word, tmap[i].type);
}
else
{
free (word);
}
break;
}
i++;
}
pos += 6 + csize;
}
return 0;
}
/* end of id3v2_extractor.c */
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