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
21 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_UDF) += udf.o
22
23 //config:
24 //config:config FEATURE_VOLUMEID_UDF
25 //config: bool "udf filesystem"
26 //config: default y
27 //config: depends on VOLUMEID
28 //config: help
29 //config: TODO
30 //config:
31
32 #include "volume_id_internal.h"
33
34 struct volume_descriptor {
35 struct descriptor_tag {
36 uint16_t id;
37 uint16_t version;
38 uint8_t checksum;
39 uint8_t reserved;
40 uint16_t serial;
41 uint16_t crc;
42 uint16_t crc_len;
43 uint32_t location;
44 } PACKED tag;
45 union {
46 struct anchor_descriptor {
47 uint32_t length;
48 uint32_t location;
49 } PACKED anchor;
50 struct primary_descriptor {
51 uint32_t seq_num;
52 uint32_t desc_num;
53 struct dstring {
54 uint8_t clen;
55 uint8_t c[31];
56 } PACKED ident;
57 } PACKED primary;
58 } PACKED type;
59 } PACKED;
60
61 struct volume_structure_descriptor {
62 uint8_t type;
63 uint8_t id[5];
64 uint8_t version;
65 } PACKED;
66
67 #define UDF_VSD_OFFSET 0x8000
68
volume_id_probe_udf(struct volume_id * id)69 int FAST_FUNC volume_id_probe_udf(struct volume_id *id /*,uint64_t off*/)
70 {
71 #define off ((uint64_t)0)
72 struct volume_descriptor *vd;
73 struct volume_structure_descriptor *vsd;
74 unsigned bs;
75 unsigned b;
76 unsigned type;
77 unsigned count;
78 unsigned loc;
79 unsigned clen;
80
81 dbg("probing at offset 0x%llx", (unsigned long long) off);
82
83 vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET, 0x200);
84 if (vsd == NULL)
85 return -1;
86
87 if (memcmp(vsd->id, "NSR02", 5) == 0)
88 goto blocksize;
89 if (memcmp(vsd->id, "NSR03", 5) == 0)
90 goto blocksize;
91 if (memcmp(vsd->id, "BEA01", 5) == 0)
92 goto blocksize;
93 if (memcmp(vsd->id, "BOOT2", 5) == 0)
94 goto blocksize;
95 if (memcmp(vsd->id, "CD001", 5) == 0)
96 goto blocksize;
97 if (memcmp(vsd->id, "CDW02", 5) == 0)
98 goto blocksize;
99 if (memcmp(vsd->id, "TEA03", 5) == 0)
100 goto blocksize;
101 return -1;
102
103 blocksize:
104 /* search the next VSD to get the logical block size of the volume */
105 for (bs = 0x800; bs < 0x8000; bs += 0x800) {
106 vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET + bs, 0x800);
107 if (vsd == NULL)
108 return -1;
109 dbg("test for blocksize: 0x%x", bs);
110 if (vsd->id[0] != '\0')
111 goto nsr;
112 }
113 return -1;
114
115 nsr:
116 /* search the list of VSDs for a NSR descriptor */
117 for (b = 0; b < 64; b++) {
118 vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET + (b * bs), 0x800);
119 if (vsd == NULL)
120 return -1;
121
122 dbg("vsd: %c%c%c%c%c",
123 vsd->id[0], vsd->id[1], vsd->id[2], vsd->id[3], vsd->id[4]);
124
125 if (vsd->id[0] == '\0')
126 return -1;
127 if (memcmp(vsd->id, "NSR02", 5) == 0)
128 goto anchor;
129 if (memcmp(vsd->id, "NSR03", 5) == 0)
130 goto anchor;
131 }
132 return -1;
133
134 anchor:
135 /* read anchor volume descriptor */
136 vd = volume_id_get_buffer(id, off + (256 * bs), 0x200);
137 if (vd == NULL)
138 return -1;
139
140 type = le16_to_cpu(vd->tag.id);
141 if (type != 2) /* TAG_ID_AVDP */
142 goto found;
143
144 /* get desriptor list address and block count */
145 count = le32_to_cpu(vd->type.anchor.length) / bs;
146 loc = le32_to_cpu(vd->type.anchor.location);
147 dbg("0x%x descriptors starting at logical secor 0x%x", count, loc);
148
149 /* pick the primary descriptor from the list */
150 for (b = 0; b < count; b++) {
151 vd = volume_id_get_buffer(id, off + ((loc + b) * bs), 0x200);
152 if (vd == NULL)
153 return -1;
154
155 type = le16_to_cpu(vd->tag.id);
156 dbg("descriptor type %i", type);
157
158 /* check validity */
159 if (type == 0)
160 goto found;
161 if (le32_to_cpu(vd->tag.location) != loc + b)
162 goto found;
163
164 if (type == 1) /* TAG_ID_PVD */
165 goto pvd;
166 }
167 goto found;
168
169 pvd:
170 // volume_id_set_label_raw(id, &(vd->type.primary.ident.clen), 32);
171
172 clen = vd->type.primary.ident.clen;
173 dbg("label string charsize=%i bit", clen);
174 if (clen == 8)
175 volume_id_set_label_string(id, vd->type.primary.ident.c, 31);
176 else if (clen == 16)
177 volume_id_set_label_unicode16(id, vd->type.primary.ident.c, BE, 31);
178
179 found:
180 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
181 IF_FEATURE_BLKID_TYPE(id->type = "udf";)
182 return 0;
183 }
184