unused_mac.c 3.7 KB

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