151 lines
4.8 KiB
C
151 lines
4.8 KiB
C
/* $NetBSD: ukfs_disklabel.c,v 1.3 2011/02/22 15:42:15 pooka Exp $ */
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/*
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* Local copies of libutil disklabel routines. This uncouples libukfs
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* from the NetBSD-only libutil. All identifiers are prefixed with
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* ukfs or UKFS, otherwise the routines are the same.
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*/
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/*
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* From:
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* NetBSD: disklabel_scan.c,v 1.3 2009/01/18 12:13:03 lukem Exp
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*/
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/*-
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Roland C. Dowdeswell.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <string.h>
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#include <unistd.h>
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#include "ukfs_int_disklabel.h"
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#define SCAN_INCR 4
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int
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ukfs__disklabel_scan(struct ukfs__disklabel *lp, int *isswapped,
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char *buf, size_t buflen)
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{
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size_t i;
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int imswapped;
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uint16_t npart;
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/* scan for the correct magic numbers. */
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for (i=0; i <= buflen - sizeof(*lp); i += SCAN_INCR) {
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memcpy(lp, buf + i, sizeof(*lp));
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if (lp->d_magic == UKFS_DISKMAGIC &&
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lp->d_magic2 == UKFS_DISKMAGIC) {
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imswapped = 0;
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goto sanity;
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}
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if (lp->d_magic == bswap32(UKFS_DISKMAGIC) &&
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lp->d_magic2 == bswap32(UKFS_DISKMAGIC)) {
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imswapped = 1;
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goto sanity;
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}
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}
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return 1;
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sanity:
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if (imswapped)
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npart = bswap16(lp->d_npartitions);
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else
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npart = lp->d_npartitions;
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/* we've found something, let's sanity check it */
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if (npart > UKFS_MAXPARTITIONS
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|| ukfs__disklabel_dkcksum(lp, imswapped))
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return 1;
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*isswapped = imswapped;
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return 0;
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}
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/*
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* From:
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* $NetBSD: disklabel_dkcksum.c,v 1.4 2005/05/15 21:01:34 thorpej Exp
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*/
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. 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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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uint16_t
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ukfs__disklabel_dkcksum(struct ukfs__disklabel *lp, int imswapped)
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{
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uint16_t *start, *end;
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uint16_t sum;
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uint16_t npart;
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if (imswapped)
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npart = bswap16(lp->d_npartitions);
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else
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npart = lp->d_npartitions;
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sum = 0;
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start = (uint16_t *)(void *)lp;
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end = (uint16_t *)(void *)&lp->d_partitions[npart];
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while (start < end) {
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if (imswapped)
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sum ^= bswap16(*start);
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else
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sum ^= *start;
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start++;
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}
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return (sum);
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}
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