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/*
* Lifted from kpartx's mac.c
*
* Integrated to partx (utils-linux-ng)
* Davidlohr Bueso <dave@gnu.org>
*/
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include "bitops.h"
#include "partx.h"
#define MAC_PARTITION_MAGIC 0x504d
#define MAC_DRIVER_MAGIC 0x4552
struct mac_partition {
uint16_t signature; /* expected to be MAC_PARTITION_MAGIC */
uint16_t res1;
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 */
/* there is more stuff after this that we don't need */
};
/* Driver descriptor structure, in block 0 */
struct mac_driver_desc {
uint16_t signature; /* expected to be MAC_DRIVER_MAGIC */
uint16_t block_size;
uint32_t block_count;
};
int
read_mac_pt(int fd, struct slice all, struct slice *sp, int ns) {
struct mac_driver_desc *md;
struct mac_partition *part;
unsigned secsize;
unsigned char *data;
int blk, blocks_in_map;
int n = 0;
md = (struct mac_driver_desc *) getblock(fd, 0);
if (md == NULL)
return -1;
if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC)
return -1;
secsize = be16_to_cpu(md->block_size);
data = getblock(fd, secsize/512);
if (!data)
return -1;
part = (struct mac_partition *) (data + secsize%512);
if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
return -1;
blocks_in_map = be32_to_cpu(part->map_count);
for (blk = 1; blk <= blocks_in_map && blk <= ns; ++blk, ++n) {
int pos = blk * secsize;
data = getblock(fd, pos/512);
if (!data)
return -1;
part = (struct mac_partition *) (data + pos%512);
if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
break;
sp[n].start = be32_to_cpu(part->start_block) * (secsize/512);
sp[n].size = be32_to_cpu(part->block_count) * (secsize/512);
}
return n;
}
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