1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include "volume_id.h"
#include "logging.h"
#include "util.h"
struct volume_descriptor {
struct descriptor_tag {
uint16_t id;
uint16_t version;
uint8_t checksum;
uint8_t reserved;
uint16_t serial;
uint16_t crc;
uint16_t crc_len;
uint32_t location;
} __attribute__((__packed__)) tag;
union {
struct anchor_descriptor {
uint32_t length;
uint32_t location;
} __attribute__((__packed__)) anchor;
struct primary_descriptor {
uint32_t seq_num;
uint32_t desc_num;
struct dstring {
uint8_t clen;
uint8_t c[31];
} __attribute__((__packed__)) ident;
} __attribute__((__packed__)) primary;
} __attribute__((__packed__)) type;
} __attribute__((__packed__));
struct volume_structure_descriptor {
uint8_t type;
uint8_t id[5];
uint8_t version;
} __attribute__((__packed__));
#define UDF_VSD_OFFSET 0x8000
int volume_id_probe_udf(struct volume_id *id, uint64_t off)
{
struct volume_descriptor *vd;
struct volume_structure_descriptor *vsd;
unsigned int bs;
unsigned int b;
unsigned int type;
unsigned int count;
unsigned int loc;
unsigned int clen;
dbg("probing at offset 0x%llx", (unsigned long long) off);
vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET, 0x200);
if (vsd == NULL)
return -1;
if (memcmp(vsd->id, "NSR02", 5) == 0)
goto blocksize;
if (memcmp(vsd->id, "NSR03", 5) == 0)
goto blocksize;
if (memcmp(vsd->id, "BEA01", 5) == 0)
goto blocksize;
if (memcmp(vsd->id, "BOOT2", 5) == 0)
goto blocksize;
if (memcmp(vsd->id, "CD001", 5) == 0)
goto blocksize;
if (memcmp(vsd->id, "CDW02", 5) == 0)
goto blocksize;
if (memcmp(vsd->id, "TEA03", 5) == 0)
goto blocksize;
return -1;
blocksize:
/* search the next VSD to get the logical block size of the volume */
for (bs = 0x800; bs < 0x8000; bs += 0x800) {
vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET + bs, 0x800);
if (vsd == NULL)
return -1;
dbg("test for blocksize: 0x%x", bs);
if (vsd->id[0] != '\0')
goto nsr;
}
return -1;
nsr:
/* search the list of VSDs for a NSR descriptor */
for (b = 0; b < 64; b++) {
vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET + (b * bs), 0x800);
if (vsd == NULL)
return -1;
dbg("vsd: %c%c%c%c%c",
vsd->id[0], vsd->id[1], vsd->id[2], vsd->id[3], vsd->id[4]);
if (vsd->id[0] == '\0')
return -1;
if (memcmp(vsd->id, "NSR02", 5) == 0)
goto anchor;
if (memcmp(vsd->id, "NSR03", 5) == 0)
goto anchor;
}
return -1;
anchor:
/* read anchor volume descriptor */
vd = (struct volume_descriptor *) volume_id_get_buffer(id, off + (256 * bs), 0x200);
if (vd == NULL)
return -1;
type = le16_to_cpu(vd->tag.id);
if (type != 2) /* TAG_ID_AVDP */
goto found;
/* get desriptor list address and block count */
count = le32_to_cpu(vd->type.anchor.length) / bs;
loc = le32_to_cpu(vd->type.anchor.location);
dbg("0x%x descriptors starting at logical secor 0x%x", count, loc);
/* pick the primary descriptor from the list */
for (b = 0; b < count; b++) {
vd = (struct volume_descriptor *) volume_id_get_buffer(id, off + ((loc + b) * bs), 0x200);
if (vd == NULL)
return -1;
type = le16_to_cpu(vd->tag.id);
dbg("descriptor type %i", type);
/* check validity */
if (type == 0)
goto found;
if (le32_to_cpu(vd->tag.location) != loc + b)
goto found;
if (type == 1) /* TAG_ID_PVD */
goto pvd;
}
goto found;
pvd:
volume_id_set_label_raw(id, &(vd->type.primary.ident.clen), 32);
clen = vd->type.primary.ident.clen;
dbg("label string charsize=%i bit", clen);
if (clen == 8)
volume_id_set_label_string(id, vd->type.primary.ident.c, 31);
else if (clen == 16)
volume_id_set_label_unicode16(id, vd->type.primary.ident.c, BE,31);
found:
volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
id->type = "udf";
return 0;
}
|
