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
21 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_ISO9660) += iso9660.o
23 //config:config FEATURE_VOLUMEID_ISO9660
24 //config: bool "iso9660 filesystem"
26 //config: depends on VOLUMEID
28 #include "volume_id_internal.h"
30 #define ISO_SUPERBLOCK_OFFSET 0x8000
31 #define ISO_SECTOR_SIZE 0x800
32 #define ISO_VD_OFFSET (ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE)
33 #define ISO_VD_PRIMARY 0x1
34 #define ISO_VD_SUPPLEMENTARY 0x2
35 #define ISO_VD_END 0xff
38 struct iso_volume_descriptor {
43 uint8_t system_id[32];
44 uint8_t volume_id[32];
46 uint8_t space_size[8];
47 uint8_t escape_sequences[8];
50 struct high_sierra_volume_descriptor {
57 int FAST_FUNC volume_id_probe_iso9660(struct volume_id *id /*,uint64_t off*/)
59 #define off ((uint64_t)0)
61 struct iso_volume_descriptor *is;
62 struct high_sierra_volume_descriptor *hs;
64 dbg("probing at offset 0x%llx", (unsigned long long) off);
66 buf = volume_id_get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200);
70 is = (struct iso_volume_descriptor *) buf;
72 if (memcmp(is->vd_id, "CD001", 5) == 0) {
76 dbg("read label from PVD");
77 // volume_id_set_label_raw(id, is->volume_id, 32);
78 volume_id_set_label_string(id, is->volume_id, 32);
80 dbg("looking for SVDs");
81 vd_offset = ISO_VD_OFFSET;
82 for (i = 0; i < ISO_VD_MAX; i++) {
83 uint8_t svd_label[64];
85 is = volume_id_get_buffer(id, off + vd_offset, 0x200);
86 if (is == NULL || is->vd_type == ISO_VD_END)
88 if (is->vd_type != ISO_VD_SUPPLEMENTARY)
91 dbg("found SVD at offset 0x%llx", (unsigned long long) (off + vd_offset));
92 if (memcmp(is->escape_sequences, "%/@", 3) == 0
93 || memcmp(is->escape_sequences, "%/C", 3) == 0
94 || memcmp(is->escape_sequences, "%/E", 3) == 0
96 dbg("Joliet extension found");
97 volume_id_set_unicode16((char *)svd_label, sizeof(svd_label), is->volume_id, BE, 32);
98 if (memcmp(id->label, svd_label, 16) == 0) {
99 dbg("SVD label is identical, use the possibly longer PVD one");
103 // volume_id_set_label_raw(id, is->volume_id, 32);
104 volume_id_set_label_string(id, svd_label, 32);
105 // strcpy(id->type_version, "Joliet Extension");
108 vd_offset += ISO_SECTOR_SIZE;
113 hs = (struct high_sierra_volume_descriptor *) buf;
115 if (memcmp(hs->id, "CDROM", 5) == 0) {
116 // strcpy(id->type_version, "High Sierra");
123 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
124 IF_FEATURE_BLKID_TYPE(id->type = "iso9660";)