From 2f567dd62ede3cf979e426738925446f1182ba52 Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay.sievers@suse.de>
Date: Wed, 8 Mar 2006 19:44:28 +0100
Subject: [PATCH] volume_id: add squashfs detection

---
 extras/volume_id/libvolume_id/Makefile    |  1 +
 extras/volume_id/libvolume_id/squashfs.c  | 53 +++++++++++++++++++++++
 extras/volume_id/libvolume_id/volume_id.c |  3 ++
 extras/volume_id/libvolume_id/volume_id.h |  3 +-
 4 files changed, 59 insertions(+), 1 deletion(-)
 create mode 100644 extras/volume_id/libvolume_id/squashfs.c

diff --git a/extras/volume_id/libvolume_id/Makefile b/extras/volume_id/libvolume_id/Makefile
index 07f6662f2..2a86e931a 100644
--- a/extras/volume_id/libvolume_id/Makefile
+++ b/extras/volume_id/libvolume_id/Makefile
@@ -38,6 +38,7 @@ OBJS=				\
 	luks.o			\
 	ocfs.o			\
 	vxfs.o			\
+	squashfs.o		\
 	volume_id.o		\
 	util.o
 
diff --git a/extras/volume_id/libvolume_id/squashfs.c b/extras/volume_id/libvolume_id/squashfs.c
new file mode 100644
index 000000000..f220721d7
--- /dev/null
+++ b/extras/volume_id/libvolume_id/squashfs.c
@@ -0,0 +1,53 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2006 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 "volume_id.h"
+#include "logging.h"
+#include "util.h"
+
+#define SQUASHFS_MAGIC		0x73717368
+
+struct squashfs_super {
+	uint32_t		s_magic;
+} PACKED;
+
+int volume_id_probe_squashfs(struct volume_id *id, uint64_t off)
+{
+	struct squashfs_super *sqs;
+
+	dbg("probing at offset 0x%llx", (unsigned long long) off);
+
+	sqs = (struct squashfs_super *) volume_id_get_buffer(id, off + 0x200, 0x200);
+	if (sqs == NULL)
+		return -1;
+
+	if (sqs->s_magic == SQUASHFS_MAGIC || sqs->s_magic == bswap_32(SQUASHFS_MAGIC)) {
+		volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
+		id->type = "squashfs";
+		return 0;
+	}
+
+	return -1;
+}
diff --git a/extras/volume_id/libvolume_id/volume_id.c b/extras/volume_id/libvolume_id/volume_id.c
index 6a900ab28..fdecf396c 100644
--- a/extras/volume_id/libvolume_id/volume_id.c
+++ b/extras/volume_id/libvolume_id/volume_id.c
@@ -149,6 +149,9 @@ int volume_id_probe_filesystem(struct volume_id *id, uint64_t off, uint64_t size
 	if (volume_id_probe_vxfs(id, off) == 0)
 		goto found;
 
+	if (volume_id_probe_squashfs(id, off) == 0)
+		goto found;
+
 	return -1;
 
 found:
diff --git a/extras/volume_id/libvolume_id/volume_id.h b/extras/volume_id/libvolume_id/volume_id.h
index 78baf5982..15f1ac01f 100644
--- a/extras/volume_id/libvolume_id/volume_id.h
+++ b/extras/volume_id/libvolume_id/volume_id.h
@@ -14,7 +14,7 @@
 #include <stdint.h>
 #include <stddef.h>
 
-#define VOLUME_ID_VERSION		58
+#define VOLUME_ID_VERSION		59
 
 #ifndef PACKED
 #define PACKED				__attribute__((packed))
@@ -96,6 +96,7 @@ extern int volume_id_probe_udf(struct volume_id *id, uint64_t off);
 extern int volume_id_probe_ufs(struct volume_id *id, uint64_t off);
 extern int volume_id_probe_vxfs(struct volume_id *id, uint64_t off);
 extern int volume_id_probe_xfs(struct volume_id *id, uint64_t off);
+extern int volume_id_probe_squashfs(struct volume_id *id, uint64_t off);
 
 /* special formats */
 extern int volume_id_probe_linux_swap(struct volume_id *id, uint64_t off);
-- 
2.30.2