1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2003 Poul-Henning Kamp
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /* Functions to encode or decode struct dos_partition into a bytestream
30 * of correct endianness and packing. These functions do no validation
31 * or sanity checking, they only pack/unpack the fields correctly.
32 *
33 * NB! This file must be usable both in kernel and userland.
34 */
35
36 #include <sys/types.h>
37 #include <sys/diskmbr.h>
38 #include <sys/endian.h>
39
40 #include "fdisk_mbr_enc.h"
41
42 void
dos_partition_dec(void const * pp,struct dos_partition * d)43 dos_partition_dec(void const *pp, struct dos_partition *d)
44 {
45 unsigned char const *p = pp;
46
47 d->dp_flag = p[0];
48 d->dp_shd = p[1];
49 d->dp_ssect = p[2];
50 d->dp_scyl = p[3];
51 d->dp_typ = p[4];
52 d->dp_ehd = p[5];
53 d->dp_esect = p[6];
54 d->dp_ecyl = p[7];
55 d->dp_start = le32dec(p + 8);
56 d->dp_size = le32dec(p + 12);
57 }
58
59 void
dos_partition_enc(void * pp,struct dos_partition * d)60 dos_partition_enc(void *pp, struct dos_partition *d)
61 {
62 unsigned char *p = pp;
63
64 p[0] = d->dp_flag;
65 p[1] = d->dp_shd;
66 p[2] = d->dp_ssect;
67 p[3] = d->dp_scyl;
68 p[4] = d->dp_typ;
69 p[5] = d->dp_ehd;
70 p[6] = d->dp_esect;
71 p[7] = d->dp_ecyl;
72 le32enc(p + 8, d->dp_start);
73 le32enc(p + 12, d->dp_size);
74 }
75