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