1 files changed, 97 insertions, 0 deletions
diff --git a/wiretap/mp4.c b/wiretap/mp4.c
new file mode 100644
index 00000000..36a43a71
--- /dev/null
+++ b/wiretap/mp4.c
@@ -0,0 +1,97 @@
+/* mp4.c
+ *
+ * MP4 (ISO/IEC 14496-12) file format decoder for the Wiretap library.
+ *
+ * Wiretap Library
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "mp4.h"
+
+#include <string.h>
+
+#include "file_wrappers.h"
+#include "wtap-int.h"
+
+static const guint8 mp4_magic[] = { 'f', 't', 'y', 'p' };
+static const guint8 mp4_magic_sidx[] = { 's', 'i', 'd', 'x' };
+static const guint8 mp4_magic_styp[] = { 's', 't', 'y', 'p' };
+
+static int mp4_file_type_subtype = -1;
+
+void register_mp4(void);
+
+wtap_open_return_val
+mp4_open(wtap *wth, int *err, gchar **err_info)
+{
+	char magic_buf[8];
+	int bytes_read;
+
+	bytes_read = file_read(magic_buf, sizeof (magic_buf), wth->fh);
+
+	if (bytes_read < 0) {
+		*err = file_error(wth->fh, err_info);
+		return WTAP_OPEN_ERROR;
+	}
+	if (bytes_read == 0)
+		return WTAP_OPEN_NOT_MINE;
+
+	if (bytes_read == sizeof (magic_buf) &&
+			memcmp(magic_buf + 4, mp4_magic, sizeof (mp4_magic)) &&
+			memcmp(magic_buf + 4, mp4_magic_sidx, sizeof (mp4_magic_sidx)) &&
+			memcmp(magic_buf + 4, mp4_magic_styp, sizeof (mp4_magic_styp)))
+		return WTAP_OPEN_NOT_MINE;
+
+	if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
+		return WTAP_OPEN_ERROR;
+
+	wth->file_type_subtype = mp4_file_type_subtype;
+	wth->file_encap = WTAP_ENCAP_MP4;
+	wth->file_tsprec = WTAP_TSPREC_SEC;
+	wth->subtype_read = wtap_full_file_read;
+	wth->subtype_seek_read = wtap_full_file_seek_read;
+	wth->snapshot_length = 0;
+
+	return WTAP_OPEN_MINE;
+}
+
+static const struct supported_block_type mp4_blocks_supported[] = {
+	/*
+	 * This is a file format that we dissect, so we provide
+	 * only one "packet" with the file's contents, and don't
+	 * support any options.
+	 */
+	{ WTAP_BLOCK_PACKET, ONE_BLOCK_SUPPORTED, NO_OPTIONS_SUPPORTED }
+};
+
+static const struct file_type_subtype_info mp4_info = {
+	"MP4 media", "mp4", "mp4", NULL,
+	FALSE, BLOCKS_SUPPORTED(mp4_blocks_supported),
+	NULL, NULL, NULL
+};
+
+void register_mp4(void)
+{
+	mp4_file_type_subtype = wtap_register_file_type_subtype(&mp4_info);
+
+	/*
+	 * Register name for backwards compatibility with the
+	 * wtap_filetypes table in Lua.
+	 */
+	wtap_register_backwards_compatibility_lua_name("MP4",
+	    mp4_file_type_subtype);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ *
+ * vi: set shiftwidth=8 tabstop=8 noexpandtab:
+ * :indentSize=8:tabSize=8:noTabs=false:
+ */