91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
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/*-
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* Copyright (c) 2003 Poul-Henning Kamp
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* Functions to encode or decode struct dos_partition into a bytestream
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* of correct endianess and packing. These functions do no validation
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* or sanity checking, they only pack/unpack the fields correctly.
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*
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* NB! This file must be usable both in kernel and userland.
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*/
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#include <sys/types.h>
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#include <sys/endian.h>
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#include "diskmbr.h"
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static __inline uint32_t __unused
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le32dec(const void *buf)
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{
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const uint8_t *p = (const uint8_t *)buf;
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return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
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}
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static __inline void
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le32enc(void *pp, uint32_t u)
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{
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unsigned char *p = (unsigned char *)pp;
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p[0] = u & 0xff;
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p[1] = (u >> 8) & 0xff;
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p[2] = (u >> 16) & 0xff;
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p[3] = (u >> 24) & 0xff;
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}
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void
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dos_partition_dec(void const *pp, struct dos_partition *d)
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{
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unsigned char const *p = pp;
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d->dp_flag = p[0];
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d->dp_shd = p[1];
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d->dp_ssect = p[2];
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d->dp_scyl = p[3];
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d->dp_typ = p[4];
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d->dp_ehd = p[5];
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d->dp_esect = p[6];
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d->dp_ecyl = p[7];
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d->dp_start = le32dec(p + 8);
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d->dp_size = le32dec(p + 12);
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}
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void
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dos_partition_enc(void *pp, struct dos_partition *d)
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{
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unsigned char *p = pp;
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p[0] = d->dp_flag;
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p[1] = d->dp_shd;
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p[2] = d->dp_ssect;
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p[3] = d->dp_scyl;
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p[4] = d->dp_typ;
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p[5] = d->dp_ehd;
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p[6] = d->dp_esect;
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p[7] = d->dp_ecyl;
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le32enc(p + 8, d->dp_start);
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le32enc(p + 12, d->dp_size);
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}
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