2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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.
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.
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
36 #include "volume_id.h"
41 struct volume_descriptor {
42 struct descriptor_tag {
51 } __attribute__((__packed__)) tag;
53 struct anchor_descriptor {
56 } __attribute__((__packed__)) anchor;
57 struct primary_descriptor {
63 } __attribute__((__packed__)) ident;
64 } __attribute__((__packed__)) primary;
65 } __attribute__((__packed__)) type;
66 } __attribute__((__packed__));
68 struct volume_structure_descriptor {
72 } __attribute__((__packed__));
74 #define UDF_VSD_OFFSET 0x8000
76 int volume_id_probe_udf(struct volume_id *id, uint64_t off)
78 struct volume_descriptor *vd;
79 struct volume_structure_descriptor *vsd;
87 dbg("probing at offset 0x%llx", (unsigned long long) off);
89 vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET, 0x200);
93 if (memcmp(vsd->id, "NSR02", 5) == 0)
95 if (memcmp(vsd->id, "NSR03", 5) == 0)
97 if (memcmp(vsd->id, "BEA01", 5) == 0)
99 if (memcmp(vsd->id, "BOOT2", 5) == 0)
101 if (memcmp(vsd->id, "CD001", 5) == 0)
103 if (memcmp(vsd->id, "CDW02", 5) == 0)
105 if (memcmp(vsd->id, "TEA03", 5) == 0)
110 /* search the next VSD to get the logical block size of the volume */
111 for (bs = 0x800; bs < 0x8000; bs += 0x800) {
112 vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET + bs, 0x800);
115 dbg("test for blocksize: 0x%x", bs);
116 if (vsd->id[0] != '\0')
122 /* search the list of VSDs for a NSR descriptor */
123 for (b = 0; b < 64; b++) {
124 vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET + (b * bs), 0x800);
128 dbg("vsd: %c%c%c%c%c",
129 vsd->id[0], vsd->id[1], vsd->id[2], vsd->id[3], vsd->id[4]);
131 if (vsd->id[0] == '\0')
133 if (memcmp(vsd->id, "NSR02", 5) == 0)
135 if (memcmp(vsd->id, "NSR03", 5) == 0)
141 /* read anchor volume descriptor */
142 vd = (struct volume_descriptor *) volume_id_get_buffer(id, off + (256 * bs), 0x200);
146 type = le16_to_cpu(vd->tag.id);
147 if (type != 2) /* TAG_ID_AVDP */
150 /* get desriptor list address and block count */
151 count = le32_to_cpu(vd->type.anchor.length) / bs;
152 loc = le32_to_cpu(vd->type.anchor.location);
153 dbg("0x%x descriptors starting at logical secor 0x%x", count, loc);
155 /* pick the primary descriptor from the list */
156 for (b = 0; b < count; b++) {
157 vd = (struct volume_descriptor *) volume_id_get_buffer(id, off + ((loc + b) * bs), 0x200);
161 type = le16_to_cpu(vd->tag.id);
162 dbg("descriptor type %i", type);
167 if (le32_to_cpu(vd->tag.location) != loc + b)
170 if (type == 1) /* TAG_ID_PVD */
176 volume_id_set_label_raw(id, &(vd->type.primary.ident.clen), 32);
178 clen = vd->type.primary.ident.clen;
179 dbg("label string charsize=%i bit", clen);
181 volume_id_set_label_string(id, vd->type.primary.ident.c, 31);
183 volume_id_set_label_unicode16(id, vd->type.primary.ident.c, BE,31);
186 volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);