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-rw-r--r--libblkid/src/superblocks/squashfs.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/libblkid/src/superblocks/squashfs.c b/libblkid/src/superblocks/squashfs.c
new file mode 100644
index 0000000..92ab77a
--- /dev/null
+++ b/libblkid/src/superblocks/squashfs.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
+ *
+ * Inspired by libvolume_id by
+ * Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * 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 "bitops.h" /* swab16() */
+#include "superblocks.h"
+
+struct sqsh_super_block {
+ uint32_t magic;
+ uint32_t inode_count;
+ uint32_t mod_time;
+ uint32_t block_size;
+ uint32_t frag_count;
+ uint16_t compressor;
+ uint16_t block_log;
+ uint16_t flags;
+ uint16_t id_count;
+ uint16_t version_major;
+ uint16_t version_minor;
+ uint64_t root_inode;
+ uint64_t bytes_used;
+ uint64_t id_table;
+ uint64_t xattr_table;
+ uint64_t inode_table;
+ uint64_t dir_table;
+ uint64_t frag_table;
+ uint64_t export_table;
+} __attribute__((packed));
+
+static int probe_squashfs(blkid_probe pr, const struct blkid_idmag *mag)
+{
+ struct sqsh_super_block *sq;
+ uint16_t vermaj;
+ uint16_t vermin;
+
+ sq = blkid_probe_get_sb(pr, mag, struct sqsh_super_block);
+ if (!sq)
+ return errno ? -errno : 1;
+
+ vermaj = le16_to_cpu(sq->version_major);
+ vermin = le16_to_cpu(sq->version_minor);
+ if (vermaj < 4)
+ return 1;
+
+ blkid_probe_sprintf_version(pr, "%u.%u", vermaj, vermin);
+ blkid_probe_set_fsblocksize(pr, le32_to_cpu(sq->block_size));
+ blkid_probe_set_block_size(pr, le32_to_cpu(sq->block_size));
+ blkid_probe_set_fssize(pr, le64_to_cpu(sq->bytes_used));
+
+ return 0;
+}
+
+static int probe_squashfs3(blkid_probe pr, const struct blkid_idmag *mag)
+{
+ struct sqsh_super_block *sq;
+ uint16_t vermaj;
+ uint16_t vermin;
+ enum BLKID_ENDIANNESS endianness;
+
+ sq = blkid_probe_get_sb(pr, mag, struct sqsh_super_block);
+ if (!sq)
+ return errno ? -errno : 1;
+
+ if (strcmp(mag->magic, "sqsh") == 0) {
+ vermaj = be16_to_cpu(sq->version_major);
+ vermin = be16_to_cpu(sq->version_minor);
+ endianness = BLKID_ENDIANNESS_BIG;
+ } else {
+ vermaj = le16_to_cpu(sq->version_major);
+ vermin = le16_to_cpu(sq->version_minor);
+ endianness = BLKID_ENDIANNESS_LITTLE;
+ }
+
+ if (vermaj > 3)
+ return 1;
+
+ blkid_probe_sprintf_version(pr, "%u.%u", vermaj, vermin);
+
+ blkid_probe_set_fsblocksize(pr, 1024);
+ blkid_probe_set_block_size(pr, 1024);
+ blkid_probe_set_fsendianness(pr, endianness);
+
+ return 0;
+}
+
+const struct blkid_idinfo squashfs_idinfo =
+{
+ .name = "squashfs",
+ .usage = BLKID_USAGE_FILESYSTEM,
+ .probefunc = probe_squashfs,
+ .magics =
+ {
+ { .magic = "hsqs", .len = 4 },
+ { NULL }
+ }
+};
+
+const struct blkid_idinfo squashfs3_idinfo =
+{
+ .name = "squashfs3",
+ .usage = BLKID_USAGE_FILESYSTEM,
+ .probefunc = probe_squashfs3,
+ .magics =
+ {
+ { .magic = "sqsh", .len = 4 }, /* big endian */
+ { .magic = "hsqs", .len = 4 }, /* little endian */
+ { NULL }
+ }
+};
+