tag: moved APE code to tag_ape.c

1 files changed, 145 insertions, 0 deletions

diff --git a/src/tag_ape.c b/src/tag_ape.c
new file mode 100644
index 00000000..c38b07a5
--- /dev/null
+++ b/src/tag_ape.c
@@ -0,0 +1,145 @@
+/*
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "tag_ape.h"
+#include "tag.h"
+
+#include <glib.h>
+
+#include <stdio.h>
+
+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;
+	int i;
+	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;
+
+	const char *apeItems[7] = {
+		"title",
+		"artist",
+		"album",
+		"comment",
+		"genre",
+		"track",
+		"year"
+	};
+
+	int tagItems[7] = {
+		TAG_ITEM_TITLE,
+		TAG_ITEM_ARTIST,
+		TAG_ITEM_ALBUM,
+		TAG_ITEM_COMMENT,
+		TAG_ITEM_GENRE,
+		TAG_ITEM_TRACK,
+		TAG_ITEM_DATE,
+	};
+
+	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))
+		goto fail;
+	if (fseek(fp, size - tagLen, SEEK_SET))
+		goto fail;
+
+	/* read tag into buffer */
+	tagLen -= sizeof(footer);
+	if (tagLen <= 0)
+		goto fail;
+	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 > 0 && *p != '\0') {
+			p++;
+			tagLen--;
+		}
+		p++;
+		tagLen--;
+
+		/* get the value */
+		if (tagLen < size)
+			goto fail;
+
+		/* we only care about utf-8 text tags */
+		if (!(flags & (0x3 << 1))) {
+			for (i = 0; i < 7; i++) {
+				if (strcasecmp(key, apeItems[i]) == 0) {
+					if (!ret)
+						ret = tag_new();
+					tag_add_item_n(ret, tagItems[i],
+						       p, size);
+				}
+			}
+		}
+		p += size;
+		tagLen -= size;
+	}
+
+fail:
+	if (fp)
+		fclose(fp);
+	g_free(buffer);
+	return ret;
+}