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geom_bsd_enc.c
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geom_bsd_enc.c
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/*-
* Copyright (c) 2002 Poul-Henning Kamp
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by Poul-Henning Kamp
* and NAI Labs, the Security Research Division of Network Associates, Inc.
* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
* DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the authors may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: src/sys/geom/geom_bsd_enc.c,v 1.4 2003/05/04 18:48:25 phk Exp $
*
* Functions to encode and decode struct disklabel and struct partition into
* a bytestream of little endianess and correct packing.
*
* NB! This file must be usable both in kernel and userland.
*
*/
#include <sys/types.h>
#include <sys/endian.h>
#include <sys/disklabel.h>
#include <sys/errno.h>
#ifdef _KERNEL
#include <sys/systm.h>
#else
#include <string.h>
#endif
void
bsd_partition_le_dec(u_char *ptr, struct partition *d)
{
d->p_size = le32dec(ptr + 0);
d->p_offset = le32dec(ptr + 4);
d->p_fsize = le32dec(ptr + 8);
d->p_fstype = ptr[12];
d->p_frag = ptr[13];
d->p_cpg = le16dec(ptr + 14);
}
int
bsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart)
{
int i;
u_char *p, *pe;
uint16_t sum;
d->d_magic = le32dec(ptr + 0);
if (d->d_magic != DISKMAGIC)
return(EINVAL);
d->d_magic2 = le32dec(ptr + 132);
if (d->d_magic2 != DISKMAGIC) {
return(EINVAL);
}
d->d_npartitions = le16dec(ptr + 138);
if (d->d_npartitions > maxpart) {
return(EINVAL);
}
pe = ptr + 148 + 16 * d->d_npartitions;
sum = 0;
for (p = ptr; p < pe; p += 2)
sum ^= le16dec(p);
if (sum != 0) {
return(EINVAL);
}
d->d_type = le16dec(ptr + 4);
d->d_subtype = le16dec(ptr + 6);
bcopy(ptr + 8, d->d_typename, 16);
bcopy(ptr + 24, d->d_packname, 16);
d->d_secsize = le32dec(ptr + 40);
d->d_nsectors = le32dec(ptr + 44);
d->d_ntracks = le32dec(ptr + 48);
d->d_ncylinders = le32dec(ptr + 52);
d->d_secpercyl = le32dec(ptr + 56);
d->d_secperunit = le32dec(ptr + 60);
d->d_sparespertrack = le16dec(ptr + 64);
d->d_sparespercyl = le16dec(ptr + 66);
d->d_acylinders = le32dec(ptr + 68);
d->d_rpm = le16dec(ptr + 72);
d->d_interleave = le16dec(ptr + 74);
d->d_trackskew = le16dec(ptr + 76);
d->d_cylskew = le16dec(ptr + 78);
d->d_headswitch = le32dec(ptr + 80);
d->d_trkseek = le32dec(ptr + 84);
d->d_flags = le32dec(ptr + 88);
d->d_drivedata[0] = le32dec(ptr + 92);
d->d_drivedata[1] = le32dec(ptr + 96);
d->d_drivedata[2] = le32dec(ptr + 100);
d->d_drivedata[3] = le32dec(ptr + 104);
d->d_drivedata[4] = le32dec(ptr + 108);
d->d_spare[0] = le32dec(ptr + 112);
d->d_spare[1] = le32dec(ptr + 116);
d->d_spare[2] = le32dec(ptr + 120);
d->d_spare[3] = le32dec(ptr + 124);
d->d_spare[4] = le32dec(ptr + 128);
d->d_checksum = le16dec(ptr + 136);
d->d_npartitions = le16dec(ptr + 138);
d->d_bbsize = le32dec(ptr + 140);
d->d_sbsize = le32dec(ptr + 144);
for (i = 0; i < MAXPARTITIONS; i++)
bsd_partition_le_dec(ptr + 148 + 16 * i, &d->d_partitions[i]);
return(0);
}
void
bsd_partition_le_enc(u_char *ptr, struct partition *d)
{
le32enc(ptr + 0, d->p_size);
le32enc(ptr + 4, d->p_offset);
le32enc(ptr + 8, d->p_fsize);
ptr[12] = d->p_fstype;
ptr[13] = d->p_frag;
le16enc(ptr + 14, d->p_cpg);
}
void
bsd_disklabel_le_enc(u_char *ptr, struct disklabel *d)
{
int i;
u_char *p, *pe;
uint16_t sum;
le32enc(ptr + 0, d->d_magic);
le16enc(ptr + 4, d->d_type);
le16enc(ptr + 6, d->d_subtype);
bcopy(d->d_typename, ptr + 8, 16);
bcopy(d->d_packname, ptr + 24, 16);
le32enc(ptr + 40, d->d_secsize);
le32enc(ptr + 44, d->d_nsectors);
le32enc(ptr + 48, d->d_ntracks);
le32enc(ptr + 52, d->d_ncylinders);
le32enc(ptr + 56, d->d_secpercyl);
le32enc(ptr + 60, d->d_secperunit);
le16enc(ptr + 64, d->d_sparespertrack);
le16enc(ptr + 66, d->d_sparespercyl);
le32enc(ptr + 68, d->d_acylinders);
le16enc(ptr + 72, d->d_rpm);
le16enc(ptr + 74, d->d_interleave);
le16enc(ptr + 76, d->d_trackskew);
le16enc(ptr + 78, d->d_cylskew);
le32enc(ptr + 80, d->d_headswitch);
le32enc(ptr + 84, d->d_trkseek);
le32enc(ptr + 88, d->d_flags);
le32enc(ptr + 92, d->d_drivedata[0]);
le32enc(ptr + 96, d->d_drivedata[1]);
le32enc(ptr + 100, d->d_drivedata[2]);
le32enc(ptr + 104, d->d_drivedata[3]);
le32enc(ptr + 108, d->d_drivedata[4]);
le32enc(ptr + 112, d->d_spare[0]);
le32enc(ptr + 116, d->d_spare[1]);
le32enc(ptr + 120, d->d_spare[2]);
le32enc(ptr + 124, d->d_spare[3]);
le32enc(ptr + 128, d->d_spare[4]);
le32enc(ptr + 132, d->d_magic2);
le16enc(ptr + 136, 0);
le16enc(ptr + 138, d->d_npartitions);
le32enc(ptr + 140, d->d_bbsize);
le32enc(ptr + 144, d->d_sbsize);
for (i = 0; i < d->d_npartitions; i++)
bsd_partition_le_enc(ptr + 148 + 16 * i, &d->d_partitions[i]);
pe = ptr + 148 + 16 * d->d_npartitions;
sum = 0;
for (p = ptr; p < pe; p += 2)
sum ^= le16dec(p);
le16enc(ptr + 136, sum);
}