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/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include "volume_id.h"
#include "logging.h"
#include "util.h"
struct mac_driver_desc {
uint8_t signature[2];
uint16_t block_size;
uint32_t block_count;
} __attribute__((__packed__));
struct mac_partition {
uint8_t signature[2];
uint16_t res1;
uint32_t map_count;
uint32_t start_block;
uint32_t block_count;
uint8_t name[32];
uint8_t type[32];
} __attribute__((__packed__));
int volume_id_probe_mac_partition_map(struct volume_id *id, uint64_t off)
{
const uint8_t *buf;
struct mac_driver_desc *driver;
struct mac_partition *part;
dbg("probing at offset 0x%llx", (unsigned long long) off);
buf = volume_id_get_buffer(id, off, 0x200);
if (buf == NULL)
return -1;
part = (struct mac_partition *) buf;
if ((memcmp(part->signature, "PM", 2) == 0) &&
(memcmp(part->type, "Apple_partition_map", 19) == 0)) {
/* linux creates an own subdevice for the map
* just return the type if the drive header is missing */
volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
id->type = "mac_partition_map";
return 0;
}
driver = (struct mac_driver_desc *) buf;
if (memcmp(driver->signature, "ER", 2) == 0) {
/* we are on a main device, like a CD
* just try to probe the first partition from the map */
unsigned int bsize = be16_to_cpu(driver->block_size);
int part_count;
int i;
/* get first entry of partition table */
buf = volume_id_get_buffer(id, off + bsize, 0x200);
if (buf == NULL)
return -1;
part = (struct mac_partition *) buf;
if (memcmp(part->signature, "PM", 2) != 0)
return -1;
part_count = be32_to_cpu(part->map_count);
dbg("expecting %d partition entries", part_count);
if (part_count < 1 || part_count > 256)
return -1;
if (id->partitions != NULL)
free(id->partitions);
id->partitions = malloc(part_count * sizeof(struct volume_id_partition));
if (id->partitions == NULL)
return -1;
memset(id->partitions, 0x00, part_count * sizeof(struct volume_id_partition));
id->partition_count = part_count;
for (i = 0; i < part_count; i++) {
uint64_t poff;
uint64_t plen;
buf = volume_id_get_buffer(id, off + ((i+1) * bsize), 0x200);
if (buf == NULL)
return -1;
part = (struct mac_partition *) buf;
if (memcmp(part->signature, "PM", 2) != 0)
return -1;
poff = be32_to_cpu(part->start_block) * bsize;
plen = be32_to_cpu(part->block_count) * bsize;
dbg("found '%s' partition entry at 0x%llx, len 0x%llx",
part->type, (unsigned long long) poff, (unsigned long long) plen);
id->partitions[i].off = poff;
id->partitions[i].len = plen;
if (memcmp(part->type, "Apple_Free", 10) == 0) {
volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_UNUSED);
} else if (memcmp(part->type, "Apple_partition_map", 19) == 0) {
volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_PARTITIONTABLE);
} else {
volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_UNPROBED);
}
}
volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
id->type = "mac_partition_map";
return 0;
}
return -1;
}
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