The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_mbr_enc.c

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    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: releng/12.0/sys/geom/geom_mbr_enc.c 326270 2017-11-27 15:17:37Z pfg $");
   38 
   39 #include <sys/types.h>
   40 #include <sys/diskmbr.h>
   41 #include <sys/endian.h>
   42 
   43 void
   44 dos_partition_dec(void const *pp, struct dos_partition *d)
   45 {
   46         unsigned char const *p = pp;
   47 
   48         d->dp_flag = p[0];
   49         d->dp_shd = p[1];
   50         d->dp_ssect = p[2];
   51         d->dp_scyl = p[3];
   52         d->dp_typ = p[4];
   53         d->dp_ehd = p[5];
   54         d->dp_esect = p[6];
   55         d->dp_ecyl = p[7];
   56         d->dp_start = le32dec(p + 8);
   57         d->dp_size = le32dec(p + 12);
   58 }
   59 
   60 void
   61 dos_partition_enc(void *pp, struct dos_partition *d)
   62 {
   63         unsigned char *p = pp;
   64 
   65         p[0] = d->dp_flag;
   66         p[1] = d->dp_shd;
   67         p[2] = d->dp_ssect;
   68         p[3] = d->dp_scyl;
   69         p[4] = d->dp_typ;
   70         p[5] = d->dp_ehd;
   71         p[6] = d->dp_esect;
   72         p[7] = d->dp_ecyl;
   73         le32enc(p + 8, d->dp_start);
   74         le32enc(p + 12, d->dp_size);
   75 }

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