Adding upstream version 2.39.3.upstream/2.39.3

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 112 insertions, 0 deletions

diff --git a/libblkid/src/superblocks/cramfs.c b/libblkid/src/superblocks/cramfs.c
new file mode 100644
index 0000000..2a87acd
--- /dev/null
+++ b/libblkid/src/superblocks/cramfs.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 1999 by Andries Brouwer
+ * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
+ * Copyright (C) 2001 by Andreas Dilger
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "superblocks.h"
+#include "crc32.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;
+	} __attribute__((packed)) info;
+	uint8_t		name[16];
+} __attribute__((packed));
+
+#define CRAMFS_FLAG_FSID_VERSION_2	0x00000001	/* fsid version #2 */
+
+static int cramfs_is_little_endian(const struct blkid_idmag *mag)
+{
+	assert(mag->len == 4);
+	return memcmp(mag->magic, "\x45\x3d\xcd\x28", 4) == 0;
+}
+
+static uint32_t cfs32_to_cpu(int le, uint32_t value)
+{
+	if (le)
+		return le32_to_cpu(value);
+	else
+		return be32_to_cpu(value);
+}
+
+static int cramfs_verify_csum(blkid_probe pr, const struct blkid_idmag *mag,
+		struct cramfs_super *cs, int le)
+{
+	uint32_t crc, expected, csummed_size;
+	unsigned char *csummed;
+
+	expected = cfs32_to_cpu(le, cs->info.crc);
+	csummed_size = cfs32_to_cpu(le, cs->size);
+
+	if (csummed_size > (1 << 16)
+	    || csummed_size < sizeof(struct cramfs_super))
+		return 0;
+
+	csummed = blkid_probe_get_sb_buffer(pr, mag, csummed_size);
+	if (!csummed)
+		return 0;
+	memset(csummed + offsetof(struct cramfs_super, info.crc), 0, sizeof(uint32_t));
+
+	crc = ~ul_crc32(~0LL, csummed, csummed_size);
+
+	return blkid_probe_verify_csum(pr, crc, expected);
+}
+
+static int probe_cramfs(blkid_probe pr, const struct blkid_idmag *mag)
+{
+	struct cramfs_super *cs;
+
+	cs = blkid_probe_get_sb(pr, mag, struct cramfs_super);
+	if (!cs)
+		return errno ? -errno : 1;
+
+	int le = cramfs_is_little_endian(mag);
+	int v2 = cfs32_to_cpu(le, cs->flags) & CRAMFS_FLAG_FSID_VERSION_2;
+
+	if (v2 && !cramfs_verify_csum(pr, mag, cs, le))
+		return 1;
+
+	blkid_probe_set_label(pr, cs->name, sizeof(cs->name));
+	blkid_probe_set_fssize(pr, cfs32_to_cpu(le, cs->size));
+	blkid_probe_sprintf_version(pr, "%d", v2 ? 2 : 1);
+	blkid_probe_set_fsendianness(pr,
+			le ? BLKID_ENDIANNESS_LITTLE : BLKID_ENDIANNESS_BIG);
+	return 0;
+}
+
+const struct blkid_idinfo cramfs_idinfo =
+{
+	.name		= "cramfs",
+	.usage		= BLKID_USAGE_FILESYSTEM,
+	.probefunc	= probe_cramfs,
+	.magics		=
+	{
+		{ .magic = "\x45\x3d\xcd\x28", .len = 4 },
+		{ .magic = "\x28\xcd\x3d\x45", .len = 4 },
+		{ NULL }
+	}
+};
+
+