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