151 lines
3.4 KiB
C
151 lines
3.4 KiB
C
/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "tag_ape.h"
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#include "tag.h"
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#include <glib.h>
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#include <assert.h>
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#include <stdio.h>
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static const char *const ape_tag_names[] = {
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[TAG_ITEM_TITLE] = "title",
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[TAG_ITEM_ARTIST] = "artist",
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[TAG_ITEM_ALBUM] = "album",
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[TAG_ITEM_COMMENT] = "comment",
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[TAG_ITEM_GENRE] = "genre",
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[TAG_ITEM_TRACK] = "track",
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[TAG_ITEM_DATE] = "year"
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};
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static struct tag *
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tag_ape_import_item(struct tag *tag, unsigned long flags,
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const char *key, const char *value, size_t value_length)
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{
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/* we only care about utf-8 text tags */
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if ((flags & (0x3 << 1)) != 0)
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return tag;
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for (unsigned i = 0; i < G_N_ELEMENTS(ape_tag_names); i++) {
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if (ape_tag_names[i] != NULL &&
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g_ascii_strcasecmp(key, ape_tag_names[i]) == 0) {
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if (tag == NULL)
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tag = tag_new();
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tag_add_item_n(tag, i, value, value_length);
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}
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}
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return tag;
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}
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struct tag *
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tag_ape_load(const char *file)
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{
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struct tag *ret = NULL;
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FILE *fp;
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int tagCount;
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char *buffer = NULL;
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char *p;
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size_t tagLen;
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size_t size;
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unsigned long flags;
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char *key;
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struct {
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unsigned char id[8];
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uint32_t version;
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uint32_t length;
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uint32_t tagCount;
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unsigned char flags[4];
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unsigned char reserved[8];
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} footer;
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fp = fopen(file, "r");
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if (!fp)
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return NULL;
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/* determine if file has an apeV2 tag */
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if (fseek(fp, 0, SEEK_END))
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goto fail;
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size = (size_t)ftell(fp);
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if (fseek(fp, size - sizeof(footer), SEEK_SET))
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goto fail;
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if (fread(&footer, 1, sizeof(footer), fp) != sizeof(footer))
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goto fail;
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if (memcmp(footer.id, "APETAGEX", sizeof(footer.id)) != 0)
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goto fail;
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if (GUINT32_FROM_LE(footer.version) != 2000)
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goto fail;
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/* find beginning of ape tag */
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tagLen = GUINT32_FROM_LE(footer.length);
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if (tagLen <= sizeof(footer) + 10)
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goto fail;
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if (tagLen > 1024 * 1024)
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/* refuse to load more than one megabyte of tag data */
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goto fail;
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if (fseek(fp, size - tagLen, SEEK_SET))
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goto fail;
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/* read tag into buffer */
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tagLen -= sizeof(footer);
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assert(tagLen > 10);
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buffer = g_malloc(tagLen);
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if (fread(buffer, 1, tagLen, fp) != tagLen)
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goto fail;
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/* read tags */
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tagCount = GUINT32_FROM_LE(footer.tagCount);
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p = buffer;
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while (tagCount-- && tagLen > 10) {
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size = GUINT32_FROM_LE(*(const uint32_t *)p);
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p += 4;
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tagLen -= 4;
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flags = GUINT32_FROM_LE(*(const uint32_t *)p);
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p += 4;
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tagLen -= 4;
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/* get the key */
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key = p;
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while (tagLen > size && *p != '\0') {
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p++;
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tagLen--;
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}
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p++;
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tagLen--;
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/* get the value */
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if (tagLen < size)
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goto fail;
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ret = tag_ape_import_item(ret, flags, key, p, size);
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p += size;
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tagLen -= size;
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}
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fail:
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if (fp)
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fclose(fp);
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g_free(buffer);
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return ret;
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}
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