cd9660.c revision 277435 
1/*-
2 * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * Copyright (c) 2014 The FreeBSD Foundation
4 * All rights reserved.
5 *
6 * This software was developed by Edward Tomasz Napierala under sponsorship
7 * from the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: stable/10/usr.sbin/fstyp/cd9660.c 277435 2015-01-20 20:41:32Z trasz $");
33
34#include <stdio.h>
35#include <stdlib.h>
36#include <string.h>
37
38#include "fstyp.h"
39
40#define	ISO9660_MAGIC	"\x01" "CD001" "\x01\x00"
41#define	ISO9660_OFFSET	0x8000
42#define	VOLUME_LEN	32
43
44int
45fstyp_cd9660(FILE *fp, char *label, size_t size)
46{
47	char *sector, *volume;
48	int i;
49
50	sector = read_buf(fp, ISO9660_OFFSET, 512);
51	if (sector == NULL)
52		return (1);
53	if (bcmp(sector, ISO9660_MAGIC, sizeof(ISO9660_MAGIC) - 1) != 0) {
54		free(sector);
55		return (1);
56	}
57	volume = sector + 0x28;
58	bzero(label, size);
59	strlcpy(label, volume, MIN(size, VOLUME_LEN));
60	free(sector);
61	for (i = size - 1; i > 0; i--) {
62		if (label[i] == '\0')
63			continue;
64		else if (label[i] == ' ')
65			label[i] = '\0';
66		else
67			break;
68	}
69	return (0);
70}
71