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 it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
26 #include "libvolume_id.h"
27 #include "libvolume_id-private.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 volume_id_probe_iso9660(struct volume_id *id, uint64_t off, uint64_t size)
60 struct iso_volume_descriptor *is;
61 struct high_sierra_volume_descriptor *hs;
63 info("probing at offset 0x%llx\n", (unsigned long long) off);
65 buf = volume_id_get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200);
69 is = (struct iso_volume_descriptor *) buf;
71 if (memcmp(is->id, "CD001", 5) == 0) {
75 dbg("read label from PVD\n");
76 volume_id_set_label_raw(id, is->volume_id, 32);
77 volume_id_set_label_string(id, is->volume_id, 32);
79 dbg("looking for SVDs\n");
80 vd_offset = ISO_VD_OFFSET;
81 for (i = 0; i < ISO_VD_MAX; i++) {
82 uint8_t svd_label[64];
84 is = (struct iso_volume_descriptor *) volume_id_get_buffer(id, off + vd_offset, 0x200);
85 if (is == NULL || is->type == ISO_VD_END)
87 if (is->type != ISO_VD_SUPPLEMENTARY)
90 dbg("found SVD at offset 0x%llx\n", (unsigned long long) (off + vd_offset));
91 if (memcmp(is->escape_sequences, "%/@", 3) == 0||
92 memcmp(is->escape_sequences, "%/C", 3) == 0||
93 memcmp(is->escape_sequences, "%/E", 3) == 0) {
94 dbg("Joliet extension found\n");
95 volume_id_set_unicode16(svd_label, sizeof(svd_label), is->volume_id, BE, 32);
96 if (memcmp(id->label, svd_label, 16) == 0) {
97 dbg("SVD label is identical, use the possibly longer PVD one\n");
101 volume_id_set_label_raw(id, is->volume_id, 32);
102 volume_id_set_label_string(id, svd_label, 32);
103 strcpy(id->type_version, "Joliet Extension");
106 vd_offset += ISO_SECTOR_SIZE;
111 hs = (struct high_sierra_volume_descriptor *) buf;
113 if (memcmp(hs->id, "CDROM", 5) == 0) {
114 strcpy(id->type_version, "High Sierra");
121 volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
122 id->type = "iso9660";