blob: 67ba8fdd5a02ea941994ad219bcc801890d91052 [file] [log] [blame]
Denis Vlasenkode7684a2008-02-18 21:08:49 +00001/*
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
Sven-Göran Bergh3b458012013-07-31 15:45:20 +020021//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_ISO9660) += iso9660.o
22
Denis Vlasenkode7684a2008-02-18 21:08:49 +000023#include "volume_id_internal.h"
24
25#define ISO_SUPERBLOCK_OFFSET 0x8000
26#define ISO_SECTOR_SIZE 0x800
27#define ISO_VD_OFFSET (ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE)
28#define ISO_VD_PRIMARY 0x1
29#define ISO_VD_SUPPLEMENTARY 0x2
30#define ISO_VD_END 0xff
31#define ISO_VD_MAX 16
32
33struct iso_volume_descriptor {
34 uint8_t vd_type;
35 uint8_t vd_id[5];
36 uint8_t vd_version;
37 uint8_t flags;
38 uint8_t system_id[32];
39 uint8_t volume_id[32];
40 uint8_t unused[8];
41 uint8_t space_size[8];
42 uint8_t escape_sequences[8];
Denys Vlasenko8dc0e192009-09-16 00:58:11 +020043} PACKED;
Denis Vlasenkode7684a2008-02-18 21:08:49 +000044
45struct high_sierra_volume_descriptor {
46 uint8_t foo[8];
47 uint8_t type;
48 uint8_t id[4];
49 uint8_t version;
Denys Vlasenko8dc0e192009-09-16 00:58:11 +020050} PACKED;
Denis Vlasenkode7684a2008-02-18 21:08:49 +000051
Denys Vlasenko89300962009-11-01 23:07:18 +010052int FAST_FUNC volume_id_probe_iso9660(struct volume_id *id /*,uint64_t off*/)
Denis Vlasenkode7684a2008-02-18 21:08:49 +000053{
Denis Vlasenko28ea4292009-02-15 05:51:19 +000054#define off ((uint64_t)0)
Denis Vlasenkode7684a2008-02-18 21:08:49 +000055 uint8_t *buf;
56 struct iso_volume_descriptor *is;
57 struct high_sierra_volume_descriptor *hs;
58
59 dbg("probing at offset 0x%llx", (unsigned long long) off);
60
61 buf = volume_id_get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200);
62 if (buf == NULL)
63 return -1;
64
65 is = (struct iso_volume_descriptor *) buf;
66
67 if (memcmp(is->vd_id, "CD001", 5) == 0) {
68 int vd_offset;
69 int i;
70
71 dbg("read label from PVD");
Denis Vlasenkoc5b73722008-03-17 09:21:26 +000072// volume_id_set_label_raw(id, is->volume_id, 32);
Denis Vlasenkode7684a2008-02-18 21:08:49 +000073 volume_id_set_label_string(id, is->volume_id, 32);
74
75 dbg("looking for SVDs");
76 vd_offset = ISO_VD_OFFSET;
77 for (i = 0; i < ISO_VD_MAX; i++) {
78 uint8_t svd_label[64];
79
80 is = volume_id_get_buffer(id, off + vd_offset, 0x200);
81 if (is == NULL || is->vd_type == ISO_VD_END)
82 break;
83 if (is->vd_type != ISO_VD_SUPPLEMENTARY)
84 continue;
85
86 dbg("found SVD at offset 0x%llx", (unsigned long long) (off + vd_offset));
Denis Vlasenkoc5b73722008-03-17 09:21:26 +000087 if (memcmp(is->escape_sequences, "%/@", 3) == 0
88 || memcmp(is->escape_sequences, "%/C", 3) == 0
89 || memcmp(is->escape_sequences, "%/E", 3) == 0
90 ) {
Denis Vlasenkode7684a2008-02-18 21:08:49 +000091 dbg("Joliet extension found");
92 volume_id_set_unicode16((char *)svd_label, sizeof(svd_label), is->volume_id, BE, 32);
93 if (memcmp(id->label, svd_label, 16) == 0) {
94 dbg("SVD label is identical, use the possibly longer PVD one");
95 break;
96 }
97
Denis Vlasenkoc5b73722008-03-17 09:21:26 +000098// volume_id_set_label_raw(id, is->volume_id, 32);
Denis Vlasenkode7684a2008-02-18 21:08:49 +000099 volume_id_set_label_string(id, svd_label, 32);
Denis Vlasenkoc5b73722008-03-17 09:21:26 +0000100// strcpy(id->type_version, "Joliet Extension");
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000101 goto found;
102 }
103 vd_offset += ISO_SECTOR_SIZE;
104 }
105 goto found;
106 }
107
108 hs = (struct high_sierra_volume_descriptor *) buf;
109
110 if (memcmp(hs->id, "CDROM", 5) == 0) {
Denis Vlasenkoc5b73722008-03-17 09:21:26 +0000111// strcpy(id->type_version, "High Sierra");
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000112 goto found;
113 }
114
115 return -1;
116
117 found:
Denis Vlasenkoc5b73722008-03-17 09:21:26 +0000118// volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
Denys Vlasenko90615a02010-12-30 00:40:11 +0100119 IF_FEATURE_BLKID_TYPE(id->type = "iso9660";)
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000120
121 return 0;
122}