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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Dave Chapman
*
* This program 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
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <inttypes.h>
#include "system.h"
#include "metadata.h"
#include "metadata_common.h"
#include "metadata_parsers.h"
#include "structec.h"
#define APETAG_HEADER_LENGTH 32
#define APETAG_HEADER_FORMAT "8llll8"
#define APETAG_ITEM_HEADER_FORMAT "ll"
#define APETAG_ITEM_TYPE_MASK 3
#ifdef HAVE_ALBUMART
/* The AA header consists of the pseudo filename "Album Cover (Front).ext"
* whereas ".ext" is the file extension. For now ".jpg" and ".png" are
* supported by this APE metadata parser. Therefore the length is 22. */
#define APETAG_AA_HEADER_LENGTH 22
#endif
struct apetag_header
{
char id[8];
long version;
long length;
long item_count;
long flags;
char reserved[8];
};
struct apetag_item_header
{
long length;
long flags;
};
/* Read the items in an APEV2 tag. Only looks for a tag at the end of a
* file. Returns true if a tag was found and fully read, false otherwise.
*/
bool read_ape_tags(int fd, struct mp3entry* id3)
{
struct apetag_header header;
if ((lseek(fd, -APETAG_HEADER_LENGTH, SEEK_END) < 0)
|| (ecread(fd, &header, 1, APETAG_HEADER_FORMAT, IS_BIG_ENDIAN)
!= APETAG_HEADER_LENGTH)
|| (memcmp(header.id, "APETAGEX", sizeof(header.id))))
{
return false;
}
if ((header.version == 2000) && (header.item_count > 0)
&& (header.length > APETAG_HEADER_LENGTH))
{
char *buf = id3->id3v2buf;
unsigned int buf_remaining = sizeof(id3->id3v2buf)
+ sizeof(id3->id3v1buf);
unsigned int tag_remaining = header.length - APETAG_HEADER_LENGTH;
int i;
if (lseek(fd, -header.length, SEEK_END) < 0)
{
return false;
}
for (i = 0; i < header.item_count; i++)
{
struct apetag_item_header item;
char name[TAG_NAME_LENGTH];
char value[TAG_VALUE_LENGTH];
long r;
if (tag_remaining < sizeof(item))
{
break;
}
if (ecread(fd, &item, 1, APETAG_ITEM_HEADER_FORMAT, IS_BIG_ENDIAN)
< (long) sizeof(item))
{
return false;
}
tag_remaining -= sizeof(item);
r = read_string(fd, name, sizeof(name), 0, tag_remaining);
if (r == -1)
{
return false;
}
tag_remaining -= r + item.length;
if ((item.flags & APETAG_ITEM_TYPE_MASK) == 0)
{
long len;
if (read_string(fd, value, sizeof(value), -1, item.length)
!= item.length)
{
return false;
}
len = parse_tag(name, value, id3, buf, buf_remaining,
TAGTYPE_APE);
buf += len;
buf_remaining -= len;
}
else
{
#ifdef HAVE_ALBUMART
if (strcasecmp(name, "cover art (front)") == 0)
{
/* Allow to read at least APETAG_AA_HEADER_LENGTH bytes. */
r = read_string(fd, name, sizeof(name), 0, APETAG_AA_HEADER_LENGTH);
if (r == -1)
{
return false;
}
/* Gather the album art format from the pseudo file name. */
id3->albumart.type = AA_TYPE_UNKNOWN;
if (strcasecmp(name, "cover art (front).jpg") == 0)
{
id3->albumart.type = AA_TYPE_JPG;
}
else if (strcasecmp(name, "cover art (front).png") == 0)
{
id3->albumart.type = AA_TYPE_PNG;
}
/* Set the album art size and position. */
if (id3->albumart.type != AA_TYPE_UNKNOWN)
{
id3->albumart.pos = lseek(fd, 0, SEEK_CUR);
id3->albumart.size = item.length - r;
id3->embed_albumart = true;
}
/* Seek back to this APE items begin. */
if (lseek(fd, -r, SEEK_CUR) < 0)
{
return false;
}
}
#endif
/* Seek to the next APE item. */
if (lseek(fd, item.length, SEEK_CUR) < 0)
{
return false;
}
}
}
}
return true;
}
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