mirror of
https://github.com/systemd/systemd.git
synced 2024-11-05 15:21:37 +03:00
126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
/*
|
|
* volume_id - reads filesystem label and uuid
|
|
*
|
|
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation version 2 of the License.
|
|
*/
|
|
|
|
#ifndef _GNU_SOURCE
|
|
#define _GNU_SOURCE 1
|
|
#endif
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <ctype.h>
|
|
|
|
#include "volume_id.h"
|
|
#include "logging.h"
|
|
#include "util.h"
|
|
|
|
#define ISO_SUPERBLOCK_OFFSET 0x8000
|
|
#define ISO_SECTOR_SIZE 0x800
|
|
#define ISO_VD_OFFSET (ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE)
|
|
#define ISO_VD_PRIMARY 0x1
|
|
#define ISO_VD_SUPPLEMENTARY 0x2
|
|
#define ISO_VD_END 0xff
|
|
#define ISO_VD_MAX 16
|
|
|
|
struct iso_volume_descriptor {
|
|
uint8_t vd_type;
|
|
uint8_t vd_id[5];
|
|
uint8_t vd_version;
|
|
uint8_t flags;
|
|
uint8_t system_id[32];
|
|
uint8_t volume_id[32];
|
|
uint8_t unused[8];
|
|
uint8_t space_size[8];
|
|
uint8_t escape_sequences[8];
|
|
} __attribute__((__packed__));
|
|
|
|
struct high_sierra_volume_descriptor {
|
|
uint8_t foo[8];
|
|
uint8_t type;
|
|
uint8_t id[4];
|
|
uint8_t version;
|
|
} __attribute__((__packed__));
|
|
|
|
int volume_id_probe_iso9660(struct volume_id *id, uint64_t off)
|
|
{
|
|
uint8_t *buf;
|
|
struct iso_volume_descriptor *is;
|
|
struct high_sierra_volume_descriptor *hs;
|
|
|
|
dbg("probing at offset 0x%llx", (unsigned long long) off);
|
|
|
|
buf = volume_id_get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200);
|
|
if (buf == NULL)
|
|
return -1;
|
|
|
|
is = (struct iso_volume_descriptor *) buf;
|
|
|
|
if (memcmp(is->vd_id, "CD001", 5) == 0) {
|
|
int vd_offset;
|
|
int i;
|
|
|
|
dbg("read label from PVD");
|
|
volume_id_set_label_raw(id, is->volume_id, 32);
|
|
volume_id_set_label_string(id, is->volume_id, 32);
|
|
|
|
dbg("looking for SVDs");
|
|
vd_offset = ISO_VD_OFFSET;
|
|
for (i = 0; i < ISO_VD_MAX; i++) {
|
|
uint8_t svd_label[64];
|
|
|
|
is = (struct iso_volume_descriptor *) volume_id_get_buffer(id, off + vd_offset, 0x200);
|
|
if (is == NULL || is->vd_type == ISO_VD_END)
|
|
break;
|
|
if (is->vd_type != ISO_VD_SUPPLEMENTARY)
|
|
continue;
|
|
|
|
dbg("found SVD at offset 0x%llx", (unsigned long long) (off + vd_offset));
|
|
if (memcmp(is->escape_sequences, "%/@", 3) == 0||
|
|
memcmp(is->escape_sequences, "%/C", 3) == 0||
|
|
memcmp(is->escape_sequences, "%/E", 3) == 0) {
|
|
dbg("Joliet extension found");
|
|
volume_id_set_unicode16((char *)svd_label, sizeof(svd_label), is->volume_id, BE, 32);
|
|
if (memcmp(id->label, svd_label, 16) == 0) {
|
|
dbg("SVD label is identical, use the possibly longer PVD one");
|
|
break;
|
|
}
|
|
|
|
volume_id_set_label_raw(id, is->volume_id, 32);
|
|
volume_id_set_label_string(id, svd_label, 32);
|
|
strcpy(id->type_version, "Joliet Extension");
|
|
goto found;
|
|
}
|
|
vd_offset += ISO_SECTOR_SIZE;
|
|
}
|
|
goto found;
|
|
}
|
|
|
|
hs = (struct high_sierra_volume_descriptor *) buf;
|
|
|
|
if (memcmp(hs->id, "CDROM", 5) == 0) {
|
|
strcpy(id->type_version, "High Sierra");
|
|
goto found;
|
|
}
|
|
|
|
return -1;
|
|
|
|
found:
|
|
volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
|
|
id->type = "iso9660";
|
|
|
|
return 0;
|
|
}
|