2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
11 * This program 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
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
31 #include "libvolume_id.h"
32 #include "libvolume_id-private.h"
34 #define ISO_SUPERBLOCK_OFFSET 0x8000
35 #define ISO_SECTOR_SIZE 0x800
36 #define ISO_VD_OFFSET (ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE)
37 #define ISO_VD_PRIMARY 0x1
38 #define ISO_VD_SUPPLEMENTARY 0x2
39 #define ISO_VD_END 0xff
42 struct iso_volume_descriptor {
47 uint8_t system_id[32];
48 uint8_t volume_id[32];
50 uint8_t space_size[8];
51 uint8_t escape_sequences[8];
54 struct high_sierra_volume_descriptor {
61 int volume_id_probe_iso9660(struct volume_id *id, uint64_t off, uint64_t size)
64 struct iso_volume_descriptor *is;
65 struct high_sierra_volume_descriptor *hs;
67 info("probing at offset 0x%llx\n", (unsigned long long) off);
69 buf = volume_id_get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200);
73 is = (struct iso_volume_descriptor *) buf;
75 if (memcmp(is->id, "CD001", 5) == 0) {
79 dbg("read label from PVD\n");
80 volume_id_set_label_raw(id, is->volume_id, 32);
81 volume_id_set_label_string(id, is->volume_id, 32);
83 dbg("looking for SVDs\n");
84 vd_offset = ISO_VD_OFFSET;
85 for (i = 0; i < ISO_VD_MAX; i++) {
86 uint8_t svd_label[64];
88 is = (struct iso_volume_descriptor *) volume_id_get_buffer(id, off + vd_offset, 0x200);
89 if (is == NULL || is->type == ISO_VD_END)
91 if (is->type != ISO_VD_SUPPLEMENTARY)
94 dbg("found SVD at offset 0x%llx\n", (unsigned long long) (off + vd_offset));
95 if (memcmp(is->escape_sequences, "%/@", 3) == 0||
96 memcmp(is->escape_sequences, "%/C", 3) == 0||
97 memcmp(is->escape_sequences, "%/E", 3) == 0) {
98 dbg("Joliet extension found\n");
99 volume_id_set_unicode16(svd_label, sizeof(svd_label), is->volume_id, BE, 32);
100 if (memcmp(id->label, svd_label, 16) == 0) {
101 dbg("SVD label is identical, use the possibly longer PVD one\n");
105 volume_id_set_label_raw(id, is->volume_id, 32);
106 volume_id_set_label_string(id, svd_label, 32);
107 strcpy(id->type_version, "Joliet Extension");
110 vd_offset += ISO_SECTOR_SIZE;
115 hs = (struct high_sierra_volume_descriptor *) buf;
117 if (memcmp(hs->id, "CDROM", 5) == 0) {
118 strcpy(id->type_version, "High Sierra");
125 volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
126 id->type = "iso9660";