source: MondoRescue/branches/2.2.9/mindi-busybox/util-linux/volume_id/unused_mac.c@ 2725

/*
 * volume_id - reads filesystem label and uuid
 *
 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "volume_id_internal.h"

struct mac_driver_desc {
    uint8_t     signature[2];
    uint16_t    block_size;
    uint32_t    block_count;
} 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];
} PACKED;

int FAST_FUNC 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 (part->signature[0] == 'P' && part->signature[1] == 'M' /* "PM" */
     && (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 (driver->signature[0] == 'E' && driver->signature[1] == 'R') { /* "ER" */
        /* we are on a main device, like a CD
         * just try to probe the first partition from the map */
        unsigned 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 (part->signature[0] != 'P' || part->signature[1] != 'M') /* not "PM" */
            return -1;

        part_count = be32_to_cpu(part->map_count);
        dbg("expecting %d partition entries", part_count);

        if (id->partitions != NULL)
            free(id->partitions);
        id->partitions = xzalloc(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 (part->signature[0] != 'P' || part->signature[1] != 'M') /* not "PM" */
                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].pt_off = poff;
//          id->partitions[i].pt_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;
}