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 //kbuild:### lib-$(CONFIG_FEATURE_VOLUMEID_MAC) += mac.o
  22
  23 //config:
  24 //config:### config FEATURE_VOLUMEID_MAC
  25 //config:###    bool "mac filesystem"
  26 //config:###    default y
  27 //config:###    depends on VOLUMEID
  28 //config:###    help
  29 //config:###      TODO
  30 //config:
  31
  32 #include "volume_id_internal.h"
  33
  34 struct mac_driver_desc {
  35         uint8_t         signature[2];
  36         uint16_t        block_size;
  37         uint32_t        block_count;
  38 } PACKED;
  39
  40 struct mac_partition {
  41         uint8_t         signature[2];
  42         uint16_t        res1;
  43         uint32_t        map_count;
  44         uint32_t        start_block;
  45         uint32_t        block_count;
  46         uint8_t         name[32];
  47         uint8_t         type[32];
  48 } PACKED;
  49
  50 int FAST_FUNC volume_id_probe_mac_partition_map(struct volume_id *id, uint64_t off)
  51 {
  52         const uint8_t *buf;
  53         struct mac_driver_desc *driver;
  54         struct mac_partition *part;
  55
  56         dbg("probing at offset 0x%llx", (unsigned long long) off);
  57
  58         buf = volume_id_get_buffer(id, off, 0x200);
  59         if (buf == NULL)
  60                 return -1;
  61
  62         part = (struct mac_partition *) buf;
  63         if (part->signature[0] == 'P' && part->signature[1] == 'M' /* "PM" */
  64          && (memcmp(part->type, "Apple_partition_map", 19) == 0)
  65         ) {
  66                 /* linux creates an own subdevice for the map
  67                  * just return the type if the drive header is missing */
  68 //              volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
  69 //              id->type = "mac_partition_map";
  70                 return 0;
  71         }
  72
  73         driver = (struct mac_driver_desc *) buf;
  74         if (driver->signature[0] == 'E' && driver->signature[1] == 'R') { /* "ER" */
  75                 /* we are on a main device, like a CD
  76                  * just try to probe the first partition from the map */
  77                 unsigned bsize = be16_to_cpu(driver->block_size);
  78                 int part_count;
  79                 int i;
  80
  81                 /* get first entry of partition table */
  82                 buf = volume_id_get_buffer(id, off +  bsize, 0x200);
  83                 if (buf == NULL)
  84                         return -1;
  85
  86                 part = (struct mac_partition *) buf;
  87                 if (part->signature[0] != 'P' || part->signature[1] != 'M') /* not "PM" */
  88                         return -1;
  89
  90                 part_count = be32_to_cpu(part->map_count);
  91                 dbg("expecting %d partition entries", part_count);
  92
  93                 if (id->partitions != NULL)
  94                         free(id->partitions);
  95                 id->partitions = xzalloc(part_count * sizeof(struct volume_id_partition));
  96
  97                 id->partition_count = part_count;
  98
  99                 for (i = 0; i < part_count; i++) {
 100                         uint64_t poff;
 101                         uint64_t plen;
 102
 103                         buf = volume_id_get_buffer(id, off + ((i+1) * bsize), 0x200);
 104                         if (buf == NULL)
 105                                 return -1;
 106
 107                         part = (struct mac_partition *) buf;
 108                         if (part->signature[0] != 'P' || part->signature[1] != 'M') /* not "PM" */
 109                                 return -1;
 110
 111                         poff = be32_to_cpu(part->start_block) * bsize;
 112                         plen = be32_to_cpu(part->block_count) * bsize;
 113                         dbg("found '%s' partition entry at 0x%llx, len 0x%llx",
 114                                         part->type, (unsigned long long) poff,
 115                                         (unsigned long long) plen);
 116
 117 //                      id->partitions[i].pt_off = poff;
 118 //                      id->partitions[i].pt_len = plen;
 119
 120 //                      if (memcmp(part->type, "Apple_Free", 10) == 0) {
 121 //                              volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_UNUSED);
 122 //                      } else if (memcmp(part->type, "Apple_partition_map", 19) == 0) {
 123 //                              volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_PARTITIONTABLE);
 124 //                      } else {
 125 //                              volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_UNPROBED);
 126 //                      }
 127                 }
 128 //              volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
 129 //              id->type = "mac_partition_map";
 130                 return 0;
 131         }
 132
 133         return -1;
 134 }