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 | //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_ISO9660) += iso9660.o
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22 |
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23 | //config:
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24 | //config:config FEATURE_VOLUMEID_ISO9660
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25 | //config: bool "iso9660 filesystem"
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26 | //config: default y
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27 | //config: depends on VOLUMEID
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28 | //config: help
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29 | //config: TODO
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30 | //config:
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31 |
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32 | #include "volume_id_internal.h"
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33 |
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34 | #define ISO_SUPERBLOCK_OFFSET 0x8000
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35 | #define ISO_SECTOR_SIZE 0x800
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36 | #define ISO_VD_OFFSET (ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE)
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37 | #define ISO_VD_PRIMARY 0x1
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38 | #define ISO_VD_SUPPLEMENTARY 0x2
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39 | #define ISO_VD_END 0xff
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40 | #define ISO_VD_MAX 16
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41 |
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42 | struct iso_volume_descriptor {
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43 | uint8_t vd_type;
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44 | uint8_t vd_id[5];
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45 | uint8_t vd_version;
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46 | uint8_t flags;
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47 | uint8_t system_id[32];
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48 | uint8_t volume_id[32];
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49 | uint8_t unused[8];
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50 | uint8_t space_size[8];
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51 | uint8_t escape_sequences[8];
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52 | } PACKED;
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53 |
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54 | struct high_sierra_volume_descriptor {
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55 | uint8_t foo[8];
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56 | uint8_t type;
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57 | uint8_t id[4];
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58 | uint8_t version;
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59 | } PACKED;
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60 |
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61 | int FAST_FUNC volume_id_probe_iso9660(struct volume_id *id /*,uint64_t off*/)
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62 | {
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63 | #define off ((uint64_t)0)
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64 | uint8_t *buf;
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65 | struct iso_volume_descriptor *is;
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66 | struct high_sierra_volume_descriptor *hs;
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67 |
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68 | dbg("probing at offset 0x%llx", (unsigned long long) off);
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69 |
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70 | buf = volume_id_get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200);
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71 | if (buf == NULL)
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72 | return -1;
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73 |
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74 | is = (struct iso_volume_descriptor *) buf;
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75 |
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76 | if (memcmp(is->vd_id, "CD001", 5) == 0) {
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77 | int vd_offset;
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78 | int i;
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79 |
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80 | dbg("read label from PVD");
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81 | // volume_id_set_label_raw(id, is->volume_id, 32);
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82 | volume_id_set_label_string(id, is->volume_id, 32);
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83 |
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84 | dbg("looking for SVDs");
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85 | vd_offset = ISO_VD_OFFSET;
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86 | for (i = 0; i < ISO_VD_MAX; i++) {
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87 | uint8_t svd_label[64];
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88 |
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89 | is = volume_id_get_buffer(id, off + vd_offset, 0x200);
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90 | if (is == NULL || is->vd_type == ISO_VD_END)
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91 | break;
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92 | if (is->vd_type != ISO_VD_SUPPLEMENTARY)
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93 | continue;
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94 |
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95 | dbg("found SVD at offset 0x%llx", (unsigned long long) (off + vd_offset));
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96 | if (memcmp(is->escape_sequences, "%/@", 3) == 0
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97 | || memcmp(is->escape_sequences, "%/C", 3) == 0
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98 | || memcmp(is->escape_sequences, "%/E", 3) == 0
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99 | ) {
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100 | dbg("Joliet extension found");
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101 | volume_id_set_unicode16((char *)svd_label, sizeof(svd_label), is->volume_id, BE, 32);
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102 | if (memcmp(id->label, svd_label, 16) == 0) {
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103 | dbg("SVD label is identical, use the possibly longer PVD one");
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104 | break;
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105 | }
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106 |
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107 | // volume_id_set_label_raw(id, is->volume_id, 32);
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108 | volume_id_set_label_string(id, svd_label, 32);
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109 | // strcpy(id->type_version, "Joliet Extension");
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110 | goto found;
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111 | }
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112 | vd_offset += ISO_SECTOR_SIZE;
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113 | }
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114 | goto found;
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115 | }
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116 |
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117 | hs = (struct high_sierra_volume_descriptor *) buf;
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118 |
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119 | if (memcmp(hs->id, "CDROM", 5) == 0) {
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120 | // strcpy(id->type_version, "High Sierra");
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121 | goto found;
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122 | }
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123 |
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124 | return -1;
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125 |
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126 | found:
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127 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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128 | IF_FEATURE_BLKID_TYPE(id->type = "iso9660";)
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129 |
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130 | return 0;
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131 | }
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