1/* 2 * volume_id - reads filesystem label and uuid 3 * 4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> 5 * 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. 9 */ 10 11#ifndef _GNU_SOURCE 12#define _GNU_SOURCE 1 13#endif 14 15#ifdef HAVE_CONFIG_H 16# include <config.h> 17#endif 18 19#include <stdio.h> 20#include <stdlib.h> 21#include <unistd.h> 22#include <string.h> 23#include <errno.h> 24#include <ctype.h> 25 26#include "libvolume_id.h" 27#include "util.h" 28 29#define ISO_SUPERBLOCK_OFFSET 0x8000 30#define ISO_SECTOR_SIZE 0x800 31#define ISO_VD_OFFSET (ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE) 32#define ISO_VD_PRIMARY 0x1 33#define ISO_VD_SUPPLEMENTARY 0x2 34#define ISO_VD_END 0xff 35#define ISO_VD_MAX 16 36 37struct iso_volume_descriptor { 38 uint8_t type; 39 uint8_t id[5]; 40 uint8_t version; 41 uint8_t flags; 42 uint8_t system_id[32]; 43 uint8_t volume_id[32]; 44 uint8_t unused[8]; 45 uint8_t space_size[8]; 46 uint8_t escape_sequences[8]; 47} PACKED; 48 49struct high_sierra_volume_descriptor { 50 uint8_t foo[8]; 51 uint8_t type; 52 uint8_t id[5]; 53 uint8_t version; 54} PACKED; 55 56int volume_id_probe_iso9660(struct volume_id *id, uint64_t off, uint64_t size) 57{ 58 uint8_t *buf; 59 struct iso_volume_descriptor *is; 60 struct high_sierra_volume_descriptor *hs; 61 62 info("probing at offset 0x%llx", (unsigned long long) off); 63 64 buf = volume_id_get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200); 65 if (buf == NULL) 66 return -1; 67 68 is = (struct iso_volume_descriptor *) buf; 69 70 if (memcmp(is->id, "CD001", 5) == 0) { 71 int vd_offset; 72 int i; 73 74 dbg("read label from PVD"); 75 volume_id_set_label_raw(id, is->volume_id, 32); 76 volume_id_set_label_string(id, is->volume_id, 32); 77 78 dbg("looking for SVDs"); 79 vd_offset = ISO_VD_OFFSET; 80 for (i = 0; i < ISO_VD_MAX; i++) { 81 uint8_t svd_label[64]; 82 83 is = (struct iso_volume_descriptor *) volume_id_get_buffer(id, off + vd_offset, 0x200); 84 if (is == NULL || is->type == ISO_VD_END) 85 break; 86 if (is->type != ISO_VD_SUPPLEMENTARY) 87 continue; 88 89 dbg("found SVD at offset 0x%llx", (unsigned long long) (off + vd_offset)); 90 if (memcmp(is->escape_sequences, "%/@", 3) == 0|| 91 memcmp(is->escape_sequences, "%/C", 3) == 0|| 92 memcmp(is->escape_sequences, "%/E", 3) == 0) { 93 dbg("Joliet extension found"); 94 volume_id_set_unicode16(svd_label, sizeof(svd_label), is->volume_id, BE, 32); 95 if (memcmp(id->label, svd_label, 16) == 0) { 96 dbg("SVD label is identical, use the possibly longer PVD one"); 97 break; 98 } 99 100 volume_id_set_label_raw(id, is->volume_id, 32); 101 volume_id_set_label_string(id, svd_label, 32); 102 strcpy(id->type_version, "Joliet Extension"); 103 goto found; 104 } 105 vd_offset += ISO_SECTOR_SIZE; 106 } 107 goto found; 108 } 109 110 hs = (struct high_sierra_volume_descriptor *) buf; 111 112 if (memcmp(hs->id, "CDROM", 5) == 0) { 113 strcpy(id->type_version, "High Sierra"); 114 goto found; 115 } 116 117 return -1; 118 119found: 120 volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); 121 id->type = "iso9660"; 122 123 return 0; 124} 125