geom_mbr_enc.c revision 116196
1163953Srrs/*- 2169382Srrs * Copyright (c) 2003 Poul-Henning Kamp 3163953Srrs * All rights reserved. 4163953Srrs * 5163953Srrs * Redistribution and use in source and binary forms, with or without 6163953Srrs * modification, are permitted provided that the following conditions 7163953Srrs * are met: 8163953Srrs * 1. Redistributions of source code must retain the above copyright 9163953Srrs * notice, this list of conditions and the following disclaimer. 10163953Srrs * 2. Redistributions in binary form must reproduce the above copyright 11163953Srrs * notice, this list of conditions and the following disclaimer in the 12163953Srrs * documentation and/or other materials provided with the distribution. 13163953Srrs * 14163953Srrs * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15163953Srrs * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16163953Srrs * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17163953Srrs * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18163953Srrs * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19163953Srrs * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20163953Srrs * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21163953Srrs * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22163953Srrs * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23163953Srrs * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24163953Srrs * SUCH DAMAGE. 25163953Srrs * 26163953Srrs * Functions to encode or decode struct dos_partition into a bytestream 27163953Srrs * of correct endianess and packing. These functions do no validation 28163953Srrs * or sanity checking, they only pack/unpack the fields correctly. 29163953Srrs * 30163953Srrs * NB! This file must be usable both in kernel and userland. 31163953Srrs */ 32163953Srrs 33163953Srrs#include <sys/cdefs.h> 34163953Srrs__FBSDID("$FreeBSD: head/sys/geom/geom_mbr_enc.c 116196 2003-06-11 06:49:16Z obrien $"); 35163953Srrs 36163953Srrs#include <sys/types.h> 37191845Szec#include <sys/diskmbr.h> 38188067Srrs#include <sys/endian.h> 39163953Srrs 40188067Srrsvoid 41163953Srrsdos_partition_dec(void const *pp, struct dos_partition *d) 42191891Srrs{ 43188067Srrs unsigned char const *p = pp; 44163953Srrs 45163953Srrs d->dp_flag = p[0]; 46188605Srrs d->dp_shd = p[1]; 47163953Srrs d->dp_ssect = p[2]; 48163953Srrs d->dp_scyl = p[3]; 49163953Srrs d->dp_typ = p[4]; 50163953Srrs d->dp_ehd = p[5]; 51163953Srrs d->dp_esect = p[6]; 52163953Srrs d->dp_ecyl = p[7]; 53163953Srrs d->dp_start = le32dec(p + 8); 54163953Srrs d->dp_size = le32dec(p + 12); 55168709Srrs} 56163953Srrs 57163953Srrsvoid 58163953Srrsdos_partition_enc(void *pp, struct dos_partition *d) 59163953Srrs{ 60163953Srrs unsigned char *p = pp; 61163953Srrs 62163953Srrs p[0] = d->dp_flag; 63163953Srrs p[1] = d->dp_shd; 64163953Srrs p[2] = d->dp_ssect; 65163953Srrs p[3] = d->dp_scyl; 66168709Srrs p[4] = d->dp_typ; 67163953Srrs p[5] = d->dp_ehd; 68163953Srrs p[6] = d->dp_esect; 69163953Srrs p[7] = d->dp_ecyl; 70163953Srrs le32enc(p + 8, d->dp_start); 71163953Srrs le32enc(p + 12, d->dp_size); 72163953Srrs} 73168709Srrs