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/*-
* Copyright (c) 2003 Poul-Henning Kamp
* All rights reserved.
*
* 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.
*
* 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.
*/
/* Functions to encode or decode struct dos_partition into a bytestream
* of correct endianess and packing. These functions do no validation
* or sanity checking, they only pack/unpack the fields correctly.
*
* NB! This file must be usable both in kernel and userland.
*/
#include <sys/types.h>
#include <sys/endian.h>
#include "diskmbr.h"
static __inline uint32_t __unused
le32dec(const void *buf)
{
const uint8_t *p = (const uint8_t *)buf;
return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
}
static __inline void
le32enc(void *pp, uint32_t u)
{
unsigned char *p = (unsigned char *)pp;
p[0] = u & 0xff;
p[1] = (u >> 8) & 0xff;
p[2] = (u >> 16) & 0xff;
p[3] = (u >> 24) & 0xff;
}
void
dos_partition_dec(void const *pp, struct dos_partition *d)
{
unsigned char const *p = pp;
d->dp_flag = p[0];
d->dp_shd = p[1];
d->dp_ssect = p[2];
d->dp_scyl = p[3];
d->dp_typ = p[4];
d->dp_ehd = p[5];
d->dp_esect = p[6];
d->dp_ecyl = p[7];
d->dp_start = le32dec(p + 8);
d->dp_size = le32dec(p + 12);
}
void
dos_partition_enc(void *pp, struct dos_partition *d)
{
unsigned char *p = pp;
p[0] = d->dp_flag;
p[1] = d->dp_shd;
p[2] = d->dp_ssect;
p[3] = d->dp_scyl;
p[4] = d->dp_typ;
p[5] = d->dp_ehd;
p[6] = d->dp_esect;
p[7] = d->dp_ecyl;
le32enc(p + 8, d->dp_start);
le32enc(p + 12, d->dp_size);
}
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