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authorMax Kellermann <max@duempel.org>2009-03-02 18:12:44 +0100
committerMax Kellermann <max@duempel.org>2009-03-02 18:12:44 +0100
commit2f438e5d238840b96414079d17f1b56ab1fba9a5 (patch)
treebc7f4453279deb3121025b8f546dc4fd0181cff8 /src/aiff.c
parent336f624277933a34a049d1d5e88f1357bf8048d8 (diff)
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tag_id3: parse ID3 tags in AIFF files
Added a small AIFF parser library, code copied from the RIFF parser (big-endian integers). Look for an "ID3" chunk, and let libid3tag parse it.
Diffstat (limited to '')
-rw-r--r--src/aiff.c103
1 files changed, 103 insertions, 0 deletions
diff --git a/src/aiff.c b/src/aiff.c
new file mode 100644
index 000000000..768e99373
--- /dev/null
+++ b/src/aiff.c
@@ -0,0 +1,103 @@
+/*
+ * 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 "aiff.h"
+
+#include <glib.h>
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "aiff"
+
+struct aiff_header {
+ char id[4];
+ uint32_t size;
+ char format[4];
+};
+
+struct aiff_chunk_header {
+ char id[4];
+ uint32_t size;
+};
+
+size_t
+aiff_seek_id3(FILE *file)
+{
+ int ret;
+ struct stat st;
+ struct aiff_header header;
+ struct aiff_chunk_header chunk;
+ size_t size;
+
+ /* determine the file size */
+
+ ret = fstat(fileno(file), &st);
+ if (ret < 0) {
+ g_warning("Failed to stat file descriptor: %s",
+ strerror(errno));
+ return 0;
+ }
+
+ /* seek to the beginning and read the AIFF header */
+
+ ret = fseek(file, 0, SEEK_SET);
+ if (ret != 0) {
+ g_warning("Failed to seek: %s", g_strerror(errno));
+ return 0;
+ }
+
+ size = fread(&header, sizeof(header), 1, file);
+ if (size != 1 ||
+ memcmp(header.id, "FORM", 4) != 0 ||
+ GUINT32_FROM_BE(header.size) > st.st_size ||
+ memcmp(header.format, "AIFF", 4) != 0)
+ /* not a AIFF file */
+ return 0;
+
+ while (true) {
+ /* read the chunk header */
+
+ size = fread(&chunk, sizeof(chunk), 1, file);
+ if (size != 1)
+ return 0;
+
+ size = GUINT32_FROM_BE(chunk.size);
+ if (size % 2 != 0)
+ /* pad byte */
+ ++size;
+
+ if (memcmp(chunk.id, "ID3 ", 4) == 0)
+ /* found it! */
+ return size;
+
+ if ((off_t)size < 0)
+ /* integer underflow after cast to signed
+ type */
+ return 0;
+
+ ret = fseek(file, size, SEEK_CUR);
+ if (ret != 0)
+ return 0;
+ }
+}