source: branches/3.2/mindi-busybox/util-linux/volume_id/iso9660.c @ 3232

Last change on this file since 3232 was 3232, checked in by Bruno Cornec, 7 years ago
  • Update mindi-busybox to 1.21.1
  • Property svn:eol-style set to native
File size: 3.3 KB
Line 
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#define ISO_SUPERBLOCK_OFFSET       0x8000
24#define ISO_SECTOR_SIZE         0x800
25#define ISO_VD_OFFSET           (ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE)
26#define ISO_VD_PRIMARY          0x1
27#define ISO_VD_SUPPLEMENTARY        0x2
28#define ISO_VD_END          0xff
29#define ISO_VD_MAX          16
30
31struct iso_volume_descriptor {
32    uint8_t     vd_type;
33    uint8_t     vd_id[5];
34    uint8_t     vd_version;
35    uint8_t     flags;
36    uint8_t     system_id[32];
37    uint8_t     volume_id[32];
38    uint8_t     unused[8];
39    uint8_t     space_size[8];
40    uint8_t     escape_sequences[8];
41} PACKED;
42
43struct high_sierra_volume_descriptor {
44    uint8_t     foo[8];
45    uint8_t     type;
46    uint8_t     id[4];
47    uint8_t     version;
48} PACKED;
49
50int FAST_FUNC volume_id_probe_iso9660(struct volume_id *id /*,uint64_t off*/)
51{
52#define off ((uint64_t)0)
53    uint8_t *buf;
54    struct iso_volume_descriptor *is;
55    struct high_sierra_volume_descriptor *hs;
56
57    dbg("probing at offset 0x%llx", (unsigned long long) off);
58
59    buf = volume_id_get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200);
60    if (buf == NULL)
61        return -1;
62
63    is = (struct iso_volume_descriptor *) buf;
64
65    if (memcmp(is->vd_id, "CD001", 5) == 0) {
66        int vd_offset;
67        int i;
68
69        dbg("read label from PVD");
70//      volume_id_set_label_raw(id, is->volume_id, 32);
71        volume_id_set_label_string(id, is->volume_id, 32);
72
73        dbg("looking for SVDs");
74        vd_offset = ISO_VD_OFFSET;
75        for (i = 0; i < ISO_VD_MAX; i++) {
76            uint8_t svd_label[64];
77
78            is = volume_id_get_buffer(id, off + vd_offset, 0x200);
79            if (is == NULL || is->vd_type == ISO_VD_END)
80                break;
81            if (is->vd_type != ISO_VD_SUPPLEMENTARY)
82                continue;
83
84            dbg("found SVD at offset 0x%llx", (unsigned long long) (off + vd_offset));
85            if (memcmp(is->escape_sequences, "%/@", 3) == 0
86             || memcmp(is->escape_sequences, "%/C", 3) == 0
87             || memcmp(is->escape_sequences, "%/E", 3) == 0
88            ) {
89                dbg("Joliet extension found");
90                volume_id_set_unicode16((char *)svd_label, sizeof(svd_label), is->volume_id, BE, 32);
91                if (memcmp(id->label, svd_label, 16) == 0) {
92                    dbg("SVD label is identical, use the possibly longer PVD one");
93                    break;
94                }
95
96//              volume_id_set_label_raw(id, is->volume_id, 32);
97                volume_id_set_label_string(id, svd_label, 32);
98//              strcpy(id->type_version, "Joliet Extension");
99                goto found;
100            }
101            vd_offset += ISO_SECTOR_SIZE;
102        }
103        goto found;
104    }
105
106    hs = (struct high_sierra_volume_descriptor *) buf;
107
108    if (memcmp(hs->id, "CDROM", 5) == 0) {
109//      strcpy(id->type_version, "High Sierra");
110        goto found;
111    }
112
113    return -1;
114
115 found:
116//  volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
117    IF_FEATURE_BLKID_TYPE(id->type = "iso9660";)
118
119    return 0;
120}
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