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_UDF) += udf.o
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22 |
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23 | //config:
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24 | //config:config FEATURE_VOLUMEID_UDF
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25 | //config: bool "udf 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 | struct volume_descriptor {
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35 | struct descriptor_tag {
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36 | uint16_t id;
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37 | uint16_t version;
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38 | uint8_t checksum;
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39 | uint8_t reserved;
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40 | uint16_t serial;
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41 | uint16_t crc;
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42 | uint16_t crc_len;
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43 | uint32_t location;
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44 | } PACKED tag;
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45 | union {
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46 | struct anchor_descriptor {
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47 | uint32_t length;
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48 | uint32_t location;
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49 | } PACKED anchor;
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50 | struct primary_descriptor {
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51 | uint32_t seq_num;
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52 | uint32_t desc_num;
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53 | struct dstring {
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54 | uint8_t clen;
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55 | uint8_t c[31];
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56 | } PACKED ident;
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57 | } PACKED primary;
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58 | } PACKED type;
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59 | } PACKED;
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60 |
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61 | struct volume_structure_descriptor {
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62 | uint8_t type;
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63 | uint8_t id[5];
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64 | uint8_t version;
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65 | } PACKED;
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66 |
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67 | #define UDF_VSD_OFFSET 0x8000
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68 |
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69 | int FAST_FUNC volume_id_probe_udf(struct volume_id *id /*,uint64_t off*/)
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70 | {
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71 | #define off ((uint64_t)0)
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72 | struct volume_descriptor *vd;
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73 | struct volume_structure_descriptor *vsd;
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74 | unsigned bs;
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75 | unsigned b;
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76 | unsigned type;
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77 | unsigned count;
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78 | unsigned loc;
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79 | unsigned clen;
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80 |
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81 | dbg("probing at offset 0x%llx", (unsigned long long) off);
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82 |
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83 | vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET, 0x200);
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84 | if (vsd == NULL)
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85 | return -1;
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86 |
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87 | if (memcmp(vsd->id, "NSR02", 5) == 0)
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88 | goto blocksize;
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89 | if (memcmp(vsd->id, "NSR03", 5) == 0)
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90 | goto blocksize;
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91 | if (memcmp(vsd->id, "BEA01", 5) == 0)
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92 | goto blocksize;
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93 | if (memcmp(vsd->id, "BOOT2", 5) == 0)
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94 | goto blocksize;
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95 | if (memcmp(vsd->id, "CD001", 5) == 0)
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96 | goto blocksize;
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97 | if (memcmp(vsd->id, "CDW02", 5) == 0)
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98 | goto blocksize;
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99 | if (memcmp(vsd->id, "TEA03", 5) == 0)
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100 | goto blocksize;
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101 | return -1;
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102 |
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103 | blocksize:
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104 | /* search the next VSD to get the logical block size of the volume */
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105 | for (bs = 0x800; bs < 0x8000; bs += 0x800) {
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106 | vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET + bs, 0x800);
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107 | if (vsd == NULL)
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108 | return -1;
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109 | dbg("test for blocksize: 0x%x", bs);
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110 | if (vsd->id[0] != '\0')
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111 | goto nsr;
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112 | }
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113 | return -1;
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114 |
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115 | nsr:
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116 | /* search the list of VSDs for a NSR descriptor */
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117 | for (b = 0; b < 64; b++) {
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118 | vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET + (b * bs), 0x800);
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119 | if (vsd == NULL)
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120 | return -1;
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121 |
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122 | dbg("vsd: %c%c%c%c%c",
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123 | vsd->id[0], vsd->id[1], vsd->id[2], vsd->id[3], vsd->id[4]);
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124 |
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125 | if (vsd->id[0] == '\0')
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126 | return -1;
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127 | if (memcmp(vsd->id, "NSR02", 5) == 0)
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128 | goto anchor;
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129 | if (memcmp(vsd->id, "NSR03", 5) == 0)
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130 | goto anchor;
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131 | }
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132 | return -1;
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133 |
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134 | anchor:
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135 | /* read anchor volume descriptor */
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136 | vd = volume_id_get_buffer(id, off + (256 * bs), 0x200);
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137 | if (vd == NULL)
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138 | return -1;
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139 |
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140 | type = le16_to_cpu(vd->tag.id);
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141 | if (type != 2) /* TAG_ID_AVDP */
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142 | goto found;
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143 |
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144 | /* get desriptor list address and block count */
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145 | count = le32_to_cpu(vd->type.anchor.length) / bs;
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146 | loc = le32_to_cpu(vd->type.anchor.location);
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147 | dbg("0x%x descriptors starting at logical secor 0x%x", count, loc);
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148 |
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149 | /* pick the primary descriptor from the list */
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150 | for (b = 0; b < count; b++) {
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151 | vd = volume_id_get_buffer(id, off + ((loc + b) * bs), 0x200);
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152 | if (vd == NULL)
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153 | return -1;
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154 |
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155 | type = le16_to_cpu(vd->tag.id);
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156 | dbg("descriptor type %i", type);
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157 |
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158 | /* check validity */
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159 | if (type == 0)
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160 | goto found;
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161 | if (le32_to_cpu(vd->tag.location) != loc + b)
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162 | goto found;
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163 |
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164 | if (type == 1) /* TAG_ID_PVD */
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165 | goto pvd;
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166 | }
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167 | goto found;
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168 |
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169 | pvd:
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170 | // volume_id_set_label_raw(id, &(vd->type.primary.ident.clen), 32);
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171 |
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172 | clen = vd->type.primary.ident.clen;
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173 | dbg("label string charsize=%i bit", clen);
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174 | if (clen == 8)
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175 | volume_id_set_label_string(id, vd->type.primary.ident.c, 31);
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176 | else if (clen == 16)
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177 | volume_id_set_label_unicode16(id, vd->type.primary.ident.c, BE, 31);
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178 |
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179 | found:
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180 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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181 | IF_FEATURE_BLKID_TYPE(id->type = "udf";)
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182 | return 0;
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183 | }
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