[2725] | 1 | /*
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| 2 | * volume_id - reads filesystem label and uuid
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| 3 | *
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| 4 | * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the GNU Lesser General Public
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| 8 | * License as published by the Free Software Foundation; either
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| 9 | * version 2.1 of the License, or (at your option) any later version.
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| 10 | *
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| 11 | * This library is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | * Lesser General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU Lesser General Public
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| 17 | * License along with this library; if not, write to the Free Software
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| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 19 | */
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| 20 |
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[3621] | 21 | //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_ISO9660) += iso9660.o
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| 22 |
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| 23 | //config:
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| 24 | //config:config FEATURE_VOLUMEID_ISO9660
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| 25 | //config: bool "iso9660 filesystem"
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| 26 | //config: default y
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| 27 | //config: depends on VOLUMEID
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| 28 | //config: help
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| 29 | //config: TODO
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| 30 | //config:
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| 31 |
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[2725] | 32 | #include "volume_id_internal.h"
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| 33 |
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| 34 | #define ISO_SUPERBLOCK_OFFSET 0x8000
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| 35 | #define ISO_SECTOR_SIZE 0x800
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| 36 | #define ISO_VD_OFFSET (ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE)
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| 37 | #define ISO_VD_PRIMARY 0x1
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| 38 | #define ISO_VD_SUPPLEMENTARY 0x2
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| 39 | #define ISO_VD_END 0xff
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| 40 | #define ISO_VD_MAX 16
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| 41 |
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| 42 | struct iso_volume_descriptor {
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| 43 | uint8_t vd_type;
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| 44 | uint8_t vd_id[5];
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| 45 | uint8_t vd_version;
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| 46 | uint8_t flags;
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| 47 | uint8_t system_id[32];
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| 48 | uint8_t volume_id[32];
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| 49 | uint8_t unused[8];
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| 50 | uint8_t space_size[8];
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| 51 | uint8_t escape_sequences[8];
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| 52 | } PACKED;
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| 53 |
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| 54 | struct high_sierra_volume_descriptor {
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| 55 | uint8_t foo[8];
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| 56 | uint8_t type;
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| 57 | uint8_t id[4];
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| 58 | uint8_t version;
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| 59 | } PACKED;
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| 60 |
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| 61 | int FAST_FUNC volume_id_probe_iso9660(struct volume_id *id /*,uint64_t off*/)
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| 62 | {
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| 63 | #define off ((uint64_t)0)
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| 64 | uint8_t *buf;
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| 65 | struct iso_volume_descriptor *is;
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| 66 | struct high_sierra_volume_descriptor *hs;
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| 67 |
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| 68 | dbg("probing at offset 0x%llx", (unsigned long long) off);
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| 69 |
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| 70 | buf = volume_id_get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200);
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| 71 | if (buf == NULL)
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| 72 | return -1;
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| 73 |
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| 74 | is = (struct iso_volume_descriptor *) buf;
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| 75 |
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| 76 | if (memcmp(is->vd_id, "CD001", 5) == 0) {
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| 77 | int vd_offset;
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| 78 | int i;
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| 79 |
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| 80 | dbg("read label from PVD");
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| 81 | // volume_id_set_label_raw(id, is->volume_id, 32);
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| 82 | volume_id_set_label_string(id, is->volume_id, 32);
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| 83 |
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| 84 | dbg("looking for SVDs");
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| 85 | vd_offset = ISO_VD_OFFSET;
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| 86 | for (i = 0; i < ISO_VD_MAX; i++) {
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| 87 | uint8_t svd_label[64];
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| 88 |
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| 89 | is = volume_id_get_buffer(id, off + vd_offset, 0x200);
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| 90 | if (is == NULL || is->vd_type == ISO_VD_END)
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| 91 | break;
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| 92 | if (is->vd_type != ISO_VD_SUPPLEMENTARY)
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| 93 | continue;
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| 94 |
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| 95 | dbg("found SVD at offset 0x%llx", (unsigned long long) (off + vd_offset));
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| 96 | if (memcmp(is->escape_sequences, "%/@", 3) == 0
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| 97 | || memcmp(is->escape_sequences, "%/C", 3) == 0
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| 98 | || memcmp(is->escape_sequences, "%/E", 3) == 0
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| 99 | ) {
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| 100 | dbg("Joliet extension found");
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| 101 | volume_id_set_unicode16((char *)svd_label, sizeof(svd_label), is->volume_id, BE, 32);
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| 102 | if (memcmp(id->label, svd_label, 16) == 0) {
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| 103 | dbg("SVD label is identical, use the possibly longer PVD one");
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| 104 | break;
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| 105 | }
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| 106 |
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| 107 | // volume_id_set_label_raw(id, is->volume_id, 32);
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| 108 | volume_id_set_label_string(id, svd_label, 32);
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| 109 | // strcpy(id->type_version, "Joliet Extension");
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| 110 | goto found;
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| 111 | }
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| 112 | vd_offset += ISO_SECTOR_SIZE;
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| 113 | }
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| 114 | goto found;
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| 115 | }
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| 116 |
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| 117 | hs = (struct high_sierra_volume_descriptor *) buf;
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| 118 |
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| 119 | if (memcmp(hs->id, "CDROM", 5) == 0) {
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| 120 | // strcpy(id->type_version, "High Sierra");
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| 121 | goto found;
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| 122 | }
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| 123 |
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| 124 | return -1;
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| 125 |
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| 126 | found:
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| 127 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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[3232] | 128 | IF_FEATURE_BLKID_TYPE(id->type = "iso9660";)
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[2725] | 129 |
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| 130 | return 0;
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| 131 | }
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