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

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    1 /*-
    2  * Copyright (c) 2003 Poul-Henning Kamp
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 /* Functions to encode or decode struct dos_partition into a bytestream
   28  * of correct endianess and packing.  These functions do no validation
   29  * or sanity checking, they only pack/unpack the fields correctly.
   30  *
   31  * NB!  This file must be usable both in kernel and userland.
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/8.2/sys/geom/geom_mbr_enc.c 199583 2009-11-20 15:27:52Z jhb $");
   36 
   37 #include <sys/types.h>
   38 #include <sys/diskmbr.h>
   39 #include <sys/endian.h>
   40 
   41 void
   42 dos_partition_dec(void const *pp, struct dos_partition *d)
   43 {
   44         unsigned char const *p = pp;
   45 
   46         d->dp_flag = p[0];
   47         d->dp_shd = p[1];
   48         d->dp_ssect = p[2];
   49         d->dp_scyl = p[3];
   50         d->dp_typ = p[4];
   51         d->dp_ehd = p[5];
   52         d->dp_esect = p[6];
   53         d->dp_ecyl = p[7];
   54         d->dp_start = le32dec(p + 8);
   55         d->dp_size = le32dec(p + 12);
   56 }
   57 
   58 void
   59 dos_partition_enc(void *pp, struct dos_partition *d)
   60 {
   61         unsigned char *p = pp;
   62 
   63         p[0] = d->dp_flag;
   64         p[1] = d->dp_shd;
   65         p[2] = d->dp_ssect;
   66         p[3] = d->dp_scyl;
   67         p[4] = d->dp_typ;
   68         p[5] = d->dp_ehd;
   69         p[6] = d->dp_esect;
   70         p[7] = d->dp_ecyl;
   71         le32enc(p + 8, d->dp_start);
   72         le32enc(p + 12, d->dp_size);
   73 }

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