git.maemo.org Git - busybox4maemo/blob - util-linux/volume_id/unused_mac.c

   1 /*
   2  * volume_id - reads filesystem label and uuid
   3  *
   4  * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
   5  *
   6  *      This library is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU Lesser General Public
   8  *      License as published by the Free Software Foundation; either
   9  *      version 2.1 of the License, or (at your option) any later version.
  10  *
  11  *      This library is distributed in the hope that it will be useful,
  12  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14  *      Lesser General Public License for more details.
  15  *
  16  *      You should have received a copy of the GNU Lesser General Public
  17  *      License along with this library; if not, write to the Free Software
  18  *      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  */
  20
  21 #include "volume_id_internal.h"
  22
  23 struct mac_driver_desc {
  24         uint8_t         signature[2];
  25         uint16_t        block_size;
  26         uint32_t        block_count;
  27 } __attribute__((__packed__));
  28
  29 struct mac_partition {
  30         uint8_t         signature[2];
  31         uint16_t        res1;
  32         uint32_t        map_count;
  33         uint32_t        start_block;
  34         uint32_t        block_count;
  35         uint8_t         name[32];
  36         uint8_t         type[32];
  37 } __attribute__((__packed__));
  38
  39 int volume_id_probe_mac_partition_map(struct volume_id *id, uint64_t off)
  40 {
  41         const uint8_t *buf;
  42         struct mac_driver_desc *driver;
  43         struct mac_partition *part;
  44
  45         dbg("probing at offset 0x%llx", (unsigned long long) off);
  46
  47         buf = volume_id_get_buffer(id, off, 0x200);
  48         if (buf == NULL)
  49                 return -1;
  50
  51         part = (struct mac_partition *) buf;
  52         if (part->signature[0] == 'P' && part->signature[1] == 'M' /* "PM" */
  53          && (memcmp(part->type, "Apple_partition_map", 19) == 0)
  54         ) {
  55                 /* linux creates an own subdevice for the map
  56                  * just return the type if the drive header is missing */
  57 //              volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
  58 //              id->type = "mac_partition_map";
  59                 return 0;
  60         }
  61
  62         driver = (struct mac_driver_desc *) buf;
  63         if (driver->signature[0] == 'E' && driver->signature[1] == 'R') { /* "ER" */
  64                 /* we are on a main device, like a CD
  65                  * just try to probe the first partition from the map */
  66                 unsigned bsize = be16_to_cpu(driver->block_size);
  67                 int part_count;
  68                 int i;
  69
  70                 /* get first entry of partition table */
  71                 buf = volume_id_get_buffer(id, off +  bsize, 0x200);
  72                 if (buf == NULL)
  73                         return -1;
  74
  75                 part = (struct mac_partition *) buf;
  76                 if (part->signature[0] != 'P' || part->signature[1] != 'M') /* not "PM" */
  77                         return -1;
  78
  79                 part_count = be32_to_cpu(part->map_count);
  80                 dbg("expecting %d partition entries", part_count);
  81
  82                 if (id->partitions != NULL)
  83                         free(id->partitions);
  84                 id->partitions = xzalloc(part_count * sizeof(struct volume_id_partition));
  85
  86                 id->partition_count = part_count;
  87
  88                 for (i = 0; i < part_count; i++) {
  89                         uint64_t poff;
  90                         uint64_t plen;
  91
  92                         buf = volume_id_get_buffer(id, off + ((i+1) * bsize), 0x200);
  93                         if (buf == NULL)
  94                                 return -1;
  95
  96                         part = (struct mac_partition *) buf;
  97                         if (part->signature[0] != 'P' || part->signature[1] != 'M') /* not "PM" */
  98                                 return -1;
  99
 100                         poff = be32_to_cpu(part->start_block) * bsize;
 101                         plen = be32_to_cpu(part->block_count) * bsize;
 102                         dbg("found '%s' partition entry at 0x%llx, len 0x%llx",
 103                                         part->type, (unsigned long long) poff,
 104                                         (unsigned long long) plen);
 105
 106 //                      id->partitions[i].pt_off = poff;
 107 //                      id->partitions[i].pt_len = plen;
 108
 109 //                      if (memcmp(part->type, "Apple_Free", 10) == 0) {
 110 //                              volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_UNUSED);
 111 //                      } else if (memcmp(part->type, "Apple_partition_map", 19) == 0) {
 112 //                              volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_PARTITIONTABLE);
 113 //                      } else {
 114 //                              volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_UNPROBED);
 115 //                      }
 116                 }
 117 //              volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
 118 //              id->type = "mac_partition_map";
 119                 return 0;
 120         }
 121
 122         return -1;
 123 }