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/*
* Copyright (C) 2003-2009 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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 program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "tag_ape.h"
#include "tag.h"
#include <glib.h>
#include <assert.h>
#include <stdio.h>
static const char *const ape_tag_names[] = {
[TAG_ITEM_TITLE] = "title",
[TAG_ITEM_ARTIST] = "artist",
[TAG_ITEM_ALBUM] = "album",
[TAG_ITEM_COMMENT] = "comment",
[TAG_ITEM_GENRE] = "genre",
[TAG_ITEM_TRACK] = "track",
[TAG_ITEM_DATE] = "year"
};
static struct tag *
tag_ape_import_item(struct tag *tag, unsigned long flags,
const char *key, const char *value, size_t value_length)
{
/* we only care about utf-8 text tags */
if ((flags & (0x3 << 1)) != 0)
return tag;
for (unsigned i = 0; i < G_N_ELEMENTS(ape_tag_names); i++) {
if (ape_tag_names[i] != NULL &&
g_ascii_strcasecmp(key, ape_tag_names[i]) == 0) {
if (tag == NULL)
tag = tag_new();
tag_add_item_n(tag, i, value, value_length);
}
}
return tag;
}
struct tag *
tag_ape_load(const char *file)
{
struct tag *ret = NULL;
FILE *fp;
int tagCount;
char *buffer = NULL;
char *p;
size_t tagLen;
size_t size;
unsigned long flags;
char *key;
struct {
unsigned char id[8];
uint32_t version;
uint32_t length;
uint32_t tagCount;
unsigned char flags[4];
unsigned char reserved[8];
} footer;
fp = fopen(file, "r");
if (!fp)
return NULL;
/* determine if file has an apeV2 tag */
if (fseek(fp, 0, SEEK_END))
goto fail;
size = (size_t)ftell(fp);
if (fseek(fp, size - sizeof(footer), SEEK_SET))
goto fail;
if (fread(&footer, 1, sizeof(footer), fp) != sizeof(footer))
goto fail;
if (memcmp(footer.id, "APETAGEX", sizeof(footer.id)) != 0)
goto fail;
if (GUINT32_FROM_LE(footer.version) != 2000)
goto fail;
/* find beginning of ape tag */
tagLen = GUINT32_FROM_LE(footer.length);
if (tagLen <= sizeof(footer) + 10)
goto fail;
if (tagLen > 1024 * 1024)
/* refuse to load more than one megabyte of tag data */
goto fail;
if (fseek(fp, size - tagLen, SEEK_SET))
goto fail;
/* read tag into buffer */
tagLen -= sizeof(footer);
assert(tagLen > 10);
buffer = g_malloc(tagLen);
if (fread(buffer, 1, tagLen, fp) != tagLen)
goto fail;
/* read tags */
tagCount = GUINT32_FROM_LE(footer.tagCount);
p = buffer;
while (tagCount-- && tagLen > 10) {
size = GUINT32_FROM_LE(*(const uint32_t *)p);
p += 4;
tagLen -= 4;
flags = GUINT32_FROM_LE(*(const uint32_t *)p);
p += 4;
tagLen -= 4;
/* get the key */
key = p;
while (tagLen > size && *p != '\0') {
p++;
tagLen--;
}
p++;
tagLen--;
/* get the value */
if (tagLen < size)
goto fail;
ret = tag_ape_import_item(ret, flags, key, p, size);
p += size;
tagLen -= size;
}
fail:
if (fp)
fclose(fp);
g_free(buffer);
return ret;
}
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