189 lines
6 KiB
C
189 lines
6 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2005 Dave Chapman
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <inttypes.h>
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#include "metadata.h"
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#include "metadata_common.h"
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#include "metadata_parsers.h"
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#include "structec.h"
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#define APETAG_HEADER_LENGTH 32
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#define APETAG_HEADER_FORMAT "8llll8"
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#define APETAG_ITEM_HEADER_FORMAT "ll"
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#define APETAG_ITEM_TYPE_MASK 3
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struct apetag_header
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{
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char id[8];
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uint32_t version;
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uint32_t length;
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uint32_t item_count;
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uint32_t flags;
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char reserved[8];
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};
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struct apetag_item_header
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{
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int32_t length;
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uint32_t flags;
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};
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/* Read the items in an APEV2 tag. Only looks for a tag at the end of a
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* file. Returns true if a tag was found and fully read, false otherwise.
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*/
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bool read_ape_tags(int fd, struct mp3entry* id3)
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{
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struct apetag_header header;
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if ((lseek(fd, -APETAG_HEADER_LENGTH, SEEK_END) < 0)
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|| (ecread(fd, &header, 1, APETAG_HEADER_FORMAT, IS_BIG_ENDIAN)
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!= APETAG_HEADER_LENGTH)
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|| (memcmp(header.id, "APETAGEX", sizeof(header.id))))
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{
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return false;
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}
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if ((header.version == 2000) && (header.item_count > 0)
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&& (header.length > APETAG_HEADER_LENGTH))
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{
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char *buf = id3->id3v2buf;
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unsigned int buf_remaining = sizeof(id3->id3v2buf)
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+ sizeof(id3->id3v1buf);
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unsigned int tag_remaining = header.length - APETAG_HEADER_LENGTH;
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unsigned int i;
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if (lseek(fd, -((int)header.length), SEEK_END) < 0)
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{
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return false;
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}
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for (i = 0; i < header.item_count; i++)
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{
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struct apetag_item_header item;
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char name[TAG_NAME_LENGTH];
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char value[TAG_VALUE_LENGTH];
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long r;
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if (tag_remaining < sizeof(item))
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{
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break;
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}
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if (ecread(fd, &item, 1, APETAG_ITEM_HEADER_FORMAT, IS_BIG_ENDIAN)
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< (long) sizeof(item))
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{
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return false;
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}
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tag_remaining -= sizeof(item);
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r = read_string(fd, name, sizeof(name), 0, tag_remaining);
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if (r == -1)
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{
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return false;
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}
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tag_remaining -= r + item.length;
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if ((item.flags & APETAG_ITEM_TYPE_MASK) == 0)
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{
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long len;
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if (read_string(fd, value, sizeof(value), -1, item.length)
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!= item.length)
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{
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return false;
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}
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if (strcasecmp(name, "cuesheet") == 0)
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{
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id3->has_embedded_cuesheet = true;
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id3->embedded_cuesheet.pos = lseek(fd, 0, SEEK_CUR)-item.length;
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id3->embedded_cuesheet.size = item.length;
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id3->embedded_cuesheet.encoding = CHAR_ENC_UTF_8;
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}
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else
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{
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len = parse_tag(name, value, id3, buf, buf_remaining,
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TAGTYPE_APE);
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buf += len;
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buf_remaining -= len;
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}
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}
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else
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{
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#ifdef HAVE_ALBUMART
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if (strcasecmp(name, "cover art (front)") == 0)
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{
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/* Skip any file name. */
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r = read_string(fd, value, sizeof(value), 0, -1);
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r += read_string(fd, value, sizeof(value), -1, 4);
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if (r == -1)
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{
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return false;
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}
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/* Gather the album art format from the magic number of the embedded binary. */
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id3->albumart.type = AA_TYPE_UNKNOWN;
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if (memcmp(value, "\xFF\xD8\xFF", 3) == 0)
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{
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id3->albumart.type = AA_TYPE_JPG;
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}
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else if (memcmp(value, "\x42\x4D", 2) == 0)
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{
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id3->albumart.type = AA_TYPE_BMP;
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}
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else if (memcmp(value, "\x89\x50\x4E\x47", 4) == 0)
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{
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id3->albumart.type = AA_TYPE_PNG;
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}
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/* Set the album art size and position. */
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if (id3->albumart.type != AA_TYPE_UNKNOWN)
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{
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id3->albumart.pos = lseek(fd, - 4, SEEK_CUR);
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id3->albumart.size = item.length - r;
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id3->has_embedded_albumart = true;
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}
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/* Seek back to this APE items begin. */
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if (lseek(fd, -r, SEEK_CUR) < 0)
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{
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return false;
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}
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}
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#endif
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/* Seek to the next APE item. */
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if (lseek(fd, item.length, SEEK_CUR) < 0)
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{
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return false;
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}
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}
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}
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}
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return true;
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}
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