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/*
* Copyright (C) 1999 by Andries Brouwer
* Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
* Copyright (C) 2001 by Andreas Dilger
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
*
* Inspired also by libvolume_id by
* Kay Sievers <kay.sievers@vrfy.org>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdint.h>
#include "superblocks.h"
/* PVD - Primary volume descriptor */
struct iso_volume_descriptor {
unsigned char vd_type;
unsigned char vd_id[5];
unsigned char vd_version;
unsigned char flags;
unsigned char system_id[32];
unsigned char volume_id[32];
unsigned char unused[8];
unsigned char space_size[8];
unsigned char escape_sequences[8];
} __attribute__((packed));
#define ISO_SUPERBLOCK_OFFSET 0x8000
#define ISO_SECTOR_SIZE 0x800
#define ISO_VD_OFFSET (ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE)
#define ISO_VD_SUPPLEMENTARY 0x2
#define ISO_VD_END 0xff
#define ISO_VD_MAX 16
struct high_sierra_volume_descriptor {
unsigned char foo[8];
unsigned char type;
unsigned char id[5];
unsigned char version;
unsigned char unused1;
unsigned char system_id[32];
unsigned char volume_id[32];
} __attribute__((packed));
/* returns 1 if the begin of @ascii is equal to @utf16 string.
*/
static int ascii_eq_utf16be(unsigned char *ascii,
unsigned char *utf16, size_t len)
{
int a, u;
for (a = 0, u = 0; u < len; a++, u += 2) {
if (utf16[u] != 0x0 || ascii[a] != utf16[u + 1])
return 0;
}
return 1;
}
/* old High Sierra format */
static int probe_iso9660_hsfs(blkid_probe pr, const struct blkid_idmag *mag)
{
struct high_sierra_volume_descriptor *iso;
iso = blkid_probe_get_sb(pr, mag, struct high_sierra_volume_descriptor);
if (!iso)
return -1;
blkid_probe_set_version(pr, "High Sierra");
blkid_probe_set_label(pr, iso->volume_id, sizeof(iso->volume_id));
return 0;
}
/* iso9660 [+ Microsoft Joliet Extension] */
static int probe_iso9660(blkid_probe pr, const struct blkid_idmag *mag)
{
struct iso_volume_descriptor *iso;
unsigned char label[32];
int i;
int off;
if (strcmp(mag->magic, "CDROM") == 0)
return probe_iso9660_hsfs(pr, mag);
iso = blkid_probe_get_sb(pr, mag, struct iso_volume_descriptor);
if (!iso)
return -1;
memcpy(label, iso->volume_id, sizeof(label));
/* Joliet Extension */
off = ISO_VD_OFFSET;
for (i = 0; i < ISO_VD_MAX; i++) {
iso = (struct iso_volume_descriptor *)
blkid_probe_get_buffer(pr,
off,
sizeof(struct iso_volume_descriptor));
if (iso == NULL || iso->vd_type == ISO_VD_END)
break;
if (iso->vd_type != ISO_VD_SUPPLEMENTARY)
continue;
if (memcmp(iso->escape_sequences, "%/@", 3) == 0 ||
memcmp(iso->escape_sequences, "%/C", 3) == 0 ||
memcmp(iso->escape_sequences, "%/E", 3) == 0) {
blkid_probe_set_version(pr, "Joliet Extension");
/* Is the Joliet (UTF16BE) label equal to the label in
* the PVD? If yes, use PVD label. The Jolied version
* of the label could be trimed (because UTF16..).
*/
if (ascii_eq_utf16be(label, iso->volume_id, 32))
break;
blkid_probe_set_utf8label(pr,
iso->volume_id,
sizeof(iso->volume_id),
BLKID_ENC_UTF16BE);
goto has_label;
}
off += ISO_SECTOR_SIZE;
}
/* Joliet not found, let use standard iso label */
blkid_probe_set_label(pr, label, sizeof(label));
has_label:
return 0;
}
const struct blkid_idinfo iso9660_idinfo =
{
.name = "iso9660",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_iso9660,
.flags = BLKID_IDINFO_TOLERANT,
.magics =
{
{ .magic = "CD001", .len = 5, .kboff = 32, .sboff = 1 },
{ .magic = "CDROM", .len = 5, .kboff = 32, .sboff = 9 },
{ NULL }
}
};
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