1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <sys/types.h> 40 #include <sys/diskmbr.h> 41 #include <sys/endian.h> 42 43 #include "fdisk_mbr_enc.h" 44 45 void 46 dos_partition_dec(void const *pp, struct dos_partition *d) 47 { 48 unsigned char const *p = pp; 49 50 d->dp_flag = p[0]; 51 d->dp_shd = p[1]; 52 d->dp_ssect = p[2]; 53 d->dp_scyl = p[3]; 54 d->dp_typ = p[4]; 55 d->dp_ehd = p[5]; 56 d->dp_esect = p[6]; 57 d->dp_ecyl = p[7]; 58 d->dp_start = le32dec(p + 8); 59 d->dp_size = le32dec(p + 12); 60 } 61 62 void 63 dos_partition_enc(void *pp, struct dos_partition *d) 64 { 65 unsigned char *p = pp; 66 67 p[0] = d->dp_flag; 68 p[1] = d->dp_shd; 69 p[2] = d->dp_ssect; 70 p[3] = d->dp_scyl; 71 p[4] = d->dp_typ; 72 p[5] = d->dp_ehd; 73 p[6] = d->dp_esect; 74 p[7] = d->dp_ecyl; 75 le32enc(p + 8, d->dp_start); 76 le32enc(p + 12, d->dp_size); 77 } 78