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