add a tiny version of libblkid

[project/ubox.git] / libblkid-tiny / squashfs.c

diff --git a/libblkid-tiny/squashfs.c b/libblkid-tiny/squashfs.c
new file mode 100644 (file)
index 0000000..d2033b6
--- /dev/null
+++ b/libblkid-tiny/squashfs.c
@@ -0,0 +1,87 @@
+/*
+ * 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"
+
+#include "md5.h"
+
+struct squashfs_super_block {
+       uint32_t s_magic;
+       uint32_t inodes;
+       uint32_t mkfs_time;
+       uint32_t block_size;
+       uint32_t fragments;
+       uint16_t compression;
+       uint16_t block_log;
+       uint16_t flags;
+       uint16_t no_ids;
+       uint16_t s_major;
+       uint16_t s_minor;
+       uint64_t root_inode;
+       uint64_t bytes_used;
+       uint64_t id_table_start;
+       uint64_t xattr_id_table_start;
+       uint64_t inode_table_start;
+       uint64_t directory_table_start;
+       uint64_t fragment_table_start;
+       uint64_t lookup_table_start;
+} __attribute__((packed));
+
+static int probe_squashfs(blkid_probe pr, const struct blkid_idmag *mag)
+{
+       md5_ctx_t ctx = { 0 };
+       uint8_t md5[4];
+       struct squashfs_super_block *sq;
+
+       sq = blkid_probe_get_sb(pr, mag, struct squashfs_super_block);
+       if (!sq)
+               return -1;
+
+       if (strcmp(mag->magic, "sqsh") == 0 ||
+           strcmp(mag->magic, "qshs") == 0)
+               blkid_probe_sprintf_version(pr, "%u.%u",
+                               sq->s_major,
+                               sq->s_minor);
+       else
+               blkid_probe_sprintf_version(pr, "%u.%u",
+                               swab16(sq->s_major),
+                               swab16(sq->s_minor));
+       md5_begin(&ctx);
+       md5_hash(sq, sizeof(*sq), &ctx);
+       md5_end(&md5, &ctx);
+       blkid_probe_sprintf_uuid(pr, NULL, 4, "%02x%02x-%02x%02x",
+                       md5[3], md5[2], md5[1], md5[0]);
+       return 0;
+}
+
+const struct blkid_idinfo squashfs_idinfo =
+{
+       .name           = "squashfs",
+       .usage          = BLKID_USAGE_FILESYSTEM,
+       .probefunc      = probe_squashfs,
+       .magics         =
+       {
+               { .magic = "sqsh", .len = 4 },
+               { .magic = "hsqs", .len = 4 }, /* swap */
+
+               /* LZMA version */
+               { .magic = "qshs", .len = 4 },
+               { .magic = "shsq", .len = 4 }, /* swap */
+               { NULL }
+       }
+};
+
+