Contents of /trunk/mkinitrd-magellan/busybox/util-linux/volume_id/udf.c
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Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
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Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
File MIME type: text/plain
File size: 4428 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
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 | #include "volume_id_internal.h" |
22 | |
23 | struct volume_descriptor { |
24 | struct descriptor_tag { |
25 | uint16_t id; |
26 | uint16_t version; |
27 | uint8_t checksum; |
28 | uint8_t reserved; |
29 | uint16_t serial; |
30 | uint16_t crc; |
31 | uint16_t crc_len; |
32 | uint32_t location; |
33 | } PACKED tag; |
34 | union { |
35 | struct anchor_descriptor { |
36 | uint32_t length; |
37 | uint32_t location; |
38 | } PACKED anchor; |
39 | struct primary_descriptor { |
40 | uint32_t seq_num; |
41 | uint32_t desc_num; |
42 | struct dstring { |
43 | uint8_t clen; |
44 | uint8_t c[31]; |
45 | } PACKED ident; |
46 | } PACKED primary; |
47 | } PACKED type; |
48 | } PACKED; |
49 | |
50 | struct volume_structure_descriptor { |
51 | uint8_t type; |
52 | uint8_t id[5]; |
53 | uint8_t version; |
54 | } PACKED; |
55 | |
56 | #define UDF_VSD_OFFSET 0x8000 |
57 | |
58 | int FAST_FUNC volume_id_probe_udf(struct volume_id *id /*,uint64_t off*/) |
59 | { |
60 | #define off ((uint64_t)0) |
61 | struct volume_descriptor *vd; |
62 | struct volume_structure_descriptor *vsd; |
63 | unsigned bs; |
64 | unsigned b; |
65 | unsigned type; |
66 | unsigned count; |
67 | unsigned loc; |
68 | unsigned clen; |
69 | |
70 | dbg("probing at offset 0x%llx", (unsigned long long) off); |
71 | |
72 | vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET, 0x200); |
73 | if (vsd == NULL) |
74 | return -1; |
75 | |
76 | if (memcmp(vsd->id, "NSR02", 5) == 0) |
77 | goto blocksize; |
78 | if (memcmp(vsd->id, "NSR03", 5) == 0) |
79 | goto blocksize; |
80 | if (memcmp(vsd->id, "BEA01", 5) == 0) |
81 | goto blocksize; |
82 | if (memcmp(vsd->id, "BOOT2", 5) == 0) |
83 | goto blocksize; |
84 | if (memcmp(vsd->id, "CD001", 5) == 0) |
85 | goto blocksize; |
86 | if (memcmp(vsd->id, "CDW02", 5) == 0) |
87 | goto blocksize; |
88 | if (memcmp(vsd->id, "TEA03", 5) == 0) |
89 | goto blocksize; |
90 | return -1; |
91 | |
92 | blocksize: |
93 | /* search the next VSD to get the logical block size of the volume */ |
94 | for (bs = 0x800; bs < 0x8000; bs += 0x800) { |
95 | vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET + bs, 0x800); |
96 | if (vsd == NULL) |
97 | return -1; |
98 | dbg("test for blocksize: 0x%x", bs); |
99 | if (vsd->id[0] != '\0') |
100 | goto nsr; |
101 | } |
102 | return -1; |
103 | |
104 | nsr: |
105 | /* search the list of VSDs for a NSR descriptor */ |
106 | for (b = 0; b < 64; b++) { |
107 | vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET + (b * bs), 0x800); |
108 | if (vsd == NULL) |
109 | return -1; |
110 | |
111 | dbg("vsd: %c%c%c%c%c", |
112 | vsd->id[0], vsd->id[1], vsd->id[2], vsd->id[3], vsd->id[4]); |
113 | |
114 | if (vsd->id[0] == '\0') |
115 | return -1; |
116 | if (memcmp(vsd->id, "NSR02", 5) == 0) |
117 | goto anchor; |
118 | if (memcmp(vsd->id, "NSR03", 5) == 0) |
119 | goto anchor; |
120 | } |
121 | return -1; |
122 | |
123 | anchor: |
124 | /* read anchor volume descriptor */ |
125 | vd = volume_id_get_buffer(id, off + (256 * bs), 0x200); |
126 | if (vd == NULL) |
127 | return -1; |
128 | |
129 | type = le16_to_cpu(vd->tag.id); |
130 | if (type != 2) /* TAG_ID_AVDP */ |
131 | goto found; |
132 | |
133 | /* get desriptor list address and block count */ |
134 | count = le32_to_cpu(vd->type.anchor.length) / bs; |
135 | loc = le32_to_cpu(vd->type.anchor.location); |
136 | dbg("0x%x descriptors starting at logical secor 0x%x", count, loc); |
137 | |
138 | /* pick the primary descriptor from the list */ |
139 | for (b = 0; b < count; b++) { |
140 | vd = volume_id_get_buffer(id, off + ((loc + b) * bs), 0x200); |
141 | if (vd == NULL) |
142 | return -1; |
143 | |
144 | type = le16_to_cpu(vd->tag.id); |
145 | dbg("descriptor type %i", type); |
146 | |
147 | /* check validity */ |
148 | if (type == 0) |
149 | goto found; |
150 | if (le32_to_cpu(vd->tag.location) != loc + b) |
151 | goto found; |
152 | |
153 | if (type == 1) /* TAG_ID_PVD */ |
154 | goto pvd; |
155 | } |
156 | goto found; |
157 | |
158 | pvd: |
159 | // volume_id_set_label_raw(id, &(vd->type.primary.ident.clen), 32); |
160 | |
161 | clen = vd->type.primary.ident.clen; |
162 | dbg("label string charsize=%i bit", clen); |
163 | if (clen == 8) |
164 | volume_id_set_label_string(id, vd->type.primary.ident.c, 31); |
165 | else if (clen == 16) |
166 | volume_id_set_label_unicode16(id, vd->type.primary.ident.c, BE, 31); |
167 | |
168 | found: |
169 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); |
170 | // id->type = "udf"; |
171 | |
172 | return 0; |
173 | } |