1 files changed, 64 insertions, 0 deletions
diff --git a/extras/volume_id/lib/cramfs.c b/extras/volume_id/lib/cramfs.c
new file mode 100644
index 0000000000..beb34d5bc0
--- /dev/null
+++ b/extras/volume_id/lib/cramfs.c
@@ -0,0 +1,64 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.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 version 2 of the License.
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include "libvolume_id.h"
+#include "util.h"
+
+struct cramfs_super {
+	uint8_t		magic[4];
+	uint32_t	size;
+	uint32_t	flags;
+	uint32_t	future;
+	uint8_t		signature[16];
+	struct cramfs_info {
+		uint32_t	crc;
+		uint32_t	edition;
+		uint32_t	blocks;
+		uint32_t	files;
+	} PACKED info;
+	uint8_t		name[16];
+} PACKED;
+
+int volume_id_probe_cramfs(struct volume_id *id, uint64_t off)
+{
+	struct cramfs_super *cs;
+
+	dbg("probing at offset 0x%llx", (unsigned long long) off);
+
+	cs = (struct cramfs_super *) volume_id_get_buffer(id, off, 0x200);
+	if (cs == NULL)
+		return -1;
+
+	if (memcmp(cs->magic, "\x45\x3d\xcd\x28", 4) == 0 || memcmp(cs->magic, "\x28\xcd\x3d\x45", 4) == 0) {
+		volume_id_set_label_raw(id, cs->name, 16);
+		volume_id_set_label_string(id, cs->name, 16);
+
+		volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
+		id->type = "cramfs";
+		return 0;
+	}
+
+	return -1;
+}