use libblkid to get filesystem type
we can now use libblkid to detect exfat
diff --git a/libblkid/mac.c b/libblkid/mac.c
new file mode 100644
index 0000000..e18896c
--- /dev/null
+++ b/libblkid/mac.c
@@ -0,0 +1,183 @@
+/*
+ * mac partitions parsing code
+ *
+ * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ *
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "partitions.h"
+
+#define MAC_PARTITION_MAGIC 0x504d
+#define MAC_PARTITION_MAGIC_OLD 0x5453
+
+/*
+ * Mac partition entry
+ * http://developer.apple.com/legacy/mac/library/documentation/mac/Devices/Devices-126.html
+ */
+struct mac_partition {
+ uint16_t signature; /* expected to be MAC_PARTITION_MAGIC */
+ uint16_t reserved; /* reserved */
+ uint32_t map_count; /* # blocks in partition map */
+ uint32_t start_block; /* absolute starting block # of partition */
+ uint32_t block_count; /* number of blocks in partition */
+ char name[32]; /* partition name */
+ char type[32]; /* string type description */
+ uint32_t data_start; /* rel block # of first data block */
+ uint32_t data_count; /* number of data blocks */
+ uint32_t status; /* partition status bits */
+ uint32_t boot_start; /* first logical block of boot code */
+ uint32_t boot_size; /* size of boot code, in bytes */
+ uint32_t boot_load; /* boot code load address */
+ uint32_t boot_load2; /* reserved */
+ uint32_t boot_entry; /* boot code entry point */
+ uint32_t boot_entry2; /* reserved */
+ uint32_t boot_cksum; /* boot code checksum */
+ char processor[16]; /* identifies ISA of boot */
+
+ /* there is more stuff after this that we don't need */
+} __attribute__((packed));
+
+/*
+ * Driver descriptor structure, in block 0
+ * http://developer.apple.com/legacy/mac/library/documentation/mac/Devices/Devices-121.html
+ */
+struct mac_driver_desc {
+ uint16_t signature; /* expected to be MAC_DRIVER_MAGIC */
+ uint16_t block_size; /* block size of the device */
+ uint32_t block_count; /* number of blocks on the device */
+
+ /* there is more stuff after this that we don't need */
+} __attribute__((packed));
+
+static inline unsigned char *get_mac_block(
+ blkid_probe pr,
+ uint16_t block_size,
+ uint32_t num)
+{
+ return blkid_probe_get_buffer(pr,
+ (blkid_loff_t) num * block_size, block_size);
+}
+
+static inline int has_part_signature(struct mac_partition *p)
+{
+ return be16_to_cpu(p->signature) == MAC_PARTITION_MAGIC ||
+ be16_to_cpu(p->signature) == MAC_PARTITION_MAGIC_OLD;
+}
+
+static int probe_mac_pt(blkid_probe pr,
+ const struct blkid_idmag *mag __attribute__((__unused__)))
+{
+ struct mac_driver_desc *md;
+ struct mac_partition *p;
+ blkid_parttable tab = NULL;
+ blkid_partlist ls;
+ uint16_t block_size;
+ uint16_t ssf; /* sector size fragment */
+ uint32_t nblks, i;
+
+
+ /* The driver descriptor record is always located at physical block 0,
+ * the first block on the disk.
+ */
+ md = (struct mac_driver_desc *) blkid_probe_get_sector(pr, 0);
+ if (!md)
+ goto nothing;
+
+ block_size = be16_to_cpu(md->block_size);
+
+ /* The partition map always begins at physical block 1,
+ * the second block on the disk.
+ */
+ p = (struct mac_partition *) get_mac_block(pr, block_size, 1);
+ if (!p)
+ goto nothing;
+
+ /* check the first partition signature */
+ if (!has_part_signature(p))
+ goto nothing;
+
+ if (blkid_partitions_need_typeonly(pr))
+ /* caller does not ask for details about partitions */
+ return 0;
+
+ ls = blkid_probe_get_partlist(pr);
+ if (!ls)
+ goto err;
+
+ tab = blkid_partlist_new_parttable(ls, "mac", 0);
+ if (!tab)
+ goto err;
+
+ ssf = block_size / 512;
+ nblks = be32_to_cpu(p->map_count);
+
+ for (i = 1; i <= nblks; ++i) {
+ blkid_partition par;
+ uint32_t start;
+ uint32_t size;
+
+ p = (struct mac_partition *) get_mac_block(pr, block_size, i);
+ if (!p)
+ goto nothing;
+ if (!has_part_signature(p))
+ goto nothing;
+
+ if (be32_to_cpu(p->map_count) != nblks) {
+ DBG(DEBUG_LOWPROBE, printf(
+ "mac: inconsisten map_count in partition map, "
+ "entry[0]: %d, entry[%d]: %d\n",
+ nblks, i - 1,
+ be32_to_cpu(p->map_count)));
+ }
+
+ /*
+ * note that libparted ignores some mac partitions according to
+ * the partition name (e.g. "Apple_Free" or "Apple_Void"). We
+ * follows Linux kernel and all partitions are visible
+ */
+
+ start = be32_to_cpu(p->start_block) * ssf;
+ size = be32_to_cpu(p->block_count) * ssf;
+
+ par = blkid_partlist_add_partition(ls, tab, start, size);
+ if (!par)
+ goto err;
+
+ blkid_partition_set_name(par, (unsigned char *) p->name,
+ sizeof(p->name));
+
+ blkid_partition_set_type_string(par, (unsigned char *) p->type,
+ sizeof(p->type));
+ }
+
+ return 0;
+
+nothing:
+ return 1;
+err:
+ return -1;
+}
+
+/*
+ * Mac disk always begin with "Driver Descriptor Record"
+ * (struct mac_driver_desc) and magic 0x4552.
+ */
+const struct blkid_idinfo mac_pt_idinfo =
+{
+ .name = "mac",
+ .probefunc = probe_mac_pt,
+ .magics =
+ {
+ /* big-endian magic string */
+ { .magic = "\x45\x52", .len = 2 },
+ { NULL }
+ }
+};
+