[2725] | 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 volume_descriptor {
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| 24 | struct descriptor_tag {
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| 25 | uint16_t id;
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| 26 | uint16_t version;
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| 27 | uint8_t checksum;
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| 28 | uint8_t reserved;
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| 29 | uint16_t serial;
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| 30 | uint16_t crc;
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| 31 | uint16_t crc_len;
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| 32 | uint32_t location;
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| 33 | } PACKED tag;
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| 34 | union {
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| 35 | struct anchor_descriptor {
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| 36 | uint32_t length;
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| 37 | uint32_t location;
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| 38 | } PACKED anchor;
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| 39 | struct primary_descriptor {
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| 40 | uint32_t seq_num;
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| 41 | uint32_t desc_num;
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| 42 | struct dstring {
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| 43 | uint8_t clen;
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| 44 | uint8_t c[31];
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| 45 | } PACKED ident;
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| 46 | } PACKED primary;
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| 47 | } PACKED type;
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| 48 | } PACKED;
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| 49 |
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| 50 | struct volume_structure_descriptor {
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| 51 | uint8_t type;
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| 52 | uint8_t id[5];
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| 53 | uint8_t version;
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| 54 | } PACKED;
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| 55 |
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| 56 | #define UDF_VSD_OFFSET 0x8000
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| 57 |
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| 58 | int FAST_FUNC volume_id_probe_udf(struct volume_id *id /*,uint64_t off*/)
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| 59 | {
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| 60 | #define off ((uint64_t)0)
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| 61 | struct volume_descriptor *vd;
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| 62 | struct volume_structure_descriptor *vsd;
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| 63 | unsigned bs;
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| 64 | unsigned b;
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| 65 | unsigned type;
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| 66 | unsigned count;
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| 67 | unsigned loc;
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| 68 | unsigned clen;
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| 69 |
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| 70 | dbg("probing at offset 0x%llx", (unsigned long long) off);
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| 71 |
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| 72 | vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET, 0x200);
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| 73 | if (vsd == NULL)
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| 74 | return -1;
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| 75 |
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| 76 | if (memcmp(vsd->id, "NSR02", 5) == 0)
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| 77 | goto blocksize;
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| 78 | if (memcmp(vsd->id, "NSR03", 5) == 0)
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| 79 | goto blocksize;
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| 80 | if (memcmp(vsd->id, "BEA01", 5) == 0)
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| 81 | goto blocksize;
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| 82 | if (memcmp(vsd->id, "BOOT2", 5) == 0)
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| 83 | goto blocksize;
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| 84 | if (memcmp(vsd->id, "CD001", 5) == 0)
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| 85 | goto blocksize;
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| 86 | if (memcmp(vsd->id, "CDW02", 5) == 0)
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| 87 | goto blocksize;
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| 88 | if (memcmp(vsd->id, "TEA03", 5) == 0)
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| 89 | goto blocksize;
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| 90 | return -1;
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| 91 |
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| 92 | blocksize:
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| 93 | /* search the next VSD to get the logical block size of the volume */
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| 94 | for (bs = 0x800; bs < 0x8000; bs += 0x800) {
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| 95 | vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET + bs, 0x800);
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| 96 | if (vsd == NULL)
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| 97 | return -1;
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| 98 | dbg("test for blocksize: 0x%x", bs);
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| 99 | if (vsd->id[0] != '\0')
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| 100 | goto nsr;
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| 101 | }
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| 102 | return -1;
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| 103 |
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| 104 | nsr:
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| 105 | /* search the list of VSDs for a NSR descriptor */
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| 106 | for (b = 0; b < 64; b++) {
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| 107 | vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET + (b * bs), 0x800);
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| 108 | if (vsd == NULL)
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| 109 | return -1;
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| 110 |
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| 111 | dbg("vsd: %c%c%c%c%c",
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| 112 | vsd->id[0], vsd->id[1], vsd->id[2], vsd->id[3], vsd->id[4]);
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| 113 |
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| 114 | if (vsd->id[0] == '\0')
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| 115 | return -1;
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| 116 | if (memcmp(vsd->id, "NSR02", 5) == 0)
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| 117 | goto anchor;
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| 118 | if (memcmp(vsd->id, "NSR03", 5) == 0)
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| 119 | goto anchor;
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| 120 | }
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| 121 | return -1;
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| 122 |
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| 123 | anchor:
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| 124 | /* read anchor volume descriptor */
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| 125 | vd = volume_id_get_buffer(id, off + (256 * bs), 0x200);
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| 126 | if (vd == NULL)
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| 127 | return -1;
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| 128 |
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| 129 | type = le16_to_cpu(vd->tag.id);
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| 130 | if (type != 2) /* TAG_ID_AVDP */
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| 131 | goto found;
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| 132 |
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| 133 | /* get desriptor list address and block count */
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| 134 | count = le32_to_cpu(vd->type.anchor.length) / bs;
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| 135 | loc = le32_to_cpu(vd->type.anchor.location);
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| 136 | dbg("0x%x descriptors starting at logical secor 0x%x", count, loc);
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| 137 |
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| 138 | /* pick the primary descriptor from the list */
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| 139 | for (b = 0; b < count; b++) {
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| 140 | vd = volume_id_get_buffer(id, off + ((loc + b) * bs), 0x200);
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| 141 | if (vd == NULL)
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| 142 | return -1;
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| 143 |
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| 144 | type = le16_to_cpu(vd->tag.id);
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| 145 | dbg("descriptor type %i", type);
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| 146 |
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| 147 | /* check validity */
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| 148 | if (type == 0)
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| 149 | goto found;
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| 150 | if (le32_to_cpu(vd->tag.location) != loc + b)
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| 151 | goto found;
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| 152 |
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| 153 | if (type == 1) /* TAG_ID_PVD */
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| 154 | goto pvd;
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| 155 | }
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| 156 | goto found;
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| 157 |
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| 158 | pvd:
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| 159 | // volume_id_set_label_raw(id, &(vd->type.primary.ident.clen), 32);
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| 160 |
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| 161 | clen = vd->type.primary.ident.clen;
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| 162 | dbg("label string charsize=%i bit", clen);
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| 163 | if (clen == 8)
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| 164 | volume_id_set_label_string(id, vd->type.primary.ident.c, 31);
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| 165 | else if (clen == 16)
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| 166 | volume_id_set_label_unicode16(id, vd->type.primary.ident.c, BE, 31);
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| 167 |
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| 168 | found:
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| 169 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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| 170 | // id->type = "udf";
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| 171 |
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| 172 | return 0;
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| 173 | }
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