197 lines
6.1 KiB
C
197 lines
6.1 KiB
C
/*-
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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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. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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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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/*
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* Functions to encode and decode struct disklabel and struct partition into
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* a bytestream of little endianness and correct packing.
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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/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/endian.h>
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#include <sys/disklabel.h>
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#include <sys/errno.h>
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#ifdef _KERNEL
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#include <sys/systm.h>
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#else
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#include <string.h>
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#endif
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void
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bsd_partition_le_dec(u_char *ptr, struct partition *d)
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{
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d->p_size = le32dec(ptr + 0);
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d->p_offset = le32dec(ptr + 4);
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d->p_fsize = le32dec(ptr + 8);
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d->p_fstype = ptr[12];
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d->p_frag = ptr[13];
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d->p_cpg = le16dec(ptr + 14);
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}
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int
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bsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart)
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{
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int i;
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u_char *p, *pe;
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uint16_t sum;
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d->d_magic = le32dec(ptr + 0);
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if (d->d_magic != DISKMAGIC)
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return(EINVAL);
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d->d_magic2 = le32dec(ptr + 132);
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if (d->d_magic2 != DISKMAGIC) {
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return(EINVAL);
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}
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d->d_npartitions = le16dec(ptr + 138);
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if (d->d_npartitions > maxpart) {
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return(EINVAL);
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}
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pe = ptr + 148 + 16 * d->d_npartitions;
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sum = 0;
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for (p = ptr; p < pe; p += 2)
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sum ^= le16dec(p);
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if (sum != 0) {
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return(EINVAL);
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}
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d->d_type = le16dec(ptr + 4);
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d->d_subtype = le16dec(ptr + 6);
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bcopy(ptr + 8, d->d_typename, 16);
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bcopy(ptr + 24, d->d_packname, 16);
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d->d_secsize = le32dec(ptr + 40);
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d->d_nsectors = le32dec(ptr + 44);
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d->d_ntracks = le32dec(ptr + 48);
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d->d_ncylinders = le32dec(ptr + 52);
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d->d_secpercyl = le32dec(ptr + 56);
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d->d_secperunit = le32dec(ptr + 60);
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d->d_sparespertrack = le16dec(ptr + 64);
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d->d_sparespercyl = le16dec(ptr + 66);
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d->d_acylinders = le32dec(ptr + 68);
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d->d_rpm = le16dec(ptr + 72);
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d->d_interleave = le16dec(ptr + 74);
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d->d_trackskew = le16dec(ptr + 76);
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d->d_cylskew = le16dec(ptr + 78);
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d->d_headswitch = le32dec(ptr + 80);
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d->d_trkseek = le32dec(ptr + 84);
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d->d_flags = le32dec(ptr + 88);
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d->d_drivedata[0] = le32dec(ptr + 92);
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d->d_drivedata[1] = le32dec(ptr + 96);
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d->d_drivedata[2] = le32dec(ptr + 100);
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d->d_drivedata[3] = le32dec(ptr + 104);
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d->d_drivedata[4] = le32dec(ptr + 108);
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d->d_spare[0] = le32dec(ptr + 112);
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d->d_spare[1] = le32dec(ptr + 116);
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d->d_spare[2] = le32dec(ptr + 120);
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d->d_spare[3] = le32dec(ptr + 124);
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d->d_spare[4] = le32dec(ptr + 128);
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d->d_checksum = le16dec(ptr + 136);
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d->d_npartitions = le16dec(ptr + 138);
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d->d_bbsize = le32dec(ptr + 140);
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d->d_sbsize = le32dec(ptr + 144);
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for (i = 0; i < d->d_npartitions; i++)
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bsd_partition_le_dec(ptr + 148 + 16 * i, &d->d_partitions[i]);
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return(0);
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}
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void
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bsd_partition_le_enc(u_char *ptr, struct partition *d)
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{
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le32enc(ptr + 0, d->p_size);
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le32enc(ptr + 4, d->p_offset);
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le32enc(ptr + 8, d->p_fsize);
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ptr[12] = d->p_fstype;
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ptr[13] = d->p_frag;
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le16enc(ptr + 14, d->p_cpg);
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}
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void
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bsd_disklabel_le_enc(u_char *ptr, struct disklabel *d)
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{
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int i;
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u_char *p, *pe;
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uint16_t sum;
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le32enc(ptr + 0, d->d_magic);
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le16enc(ptr + 4, d->d_type);
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le16enc(ptr + 6, d->d_subtype);
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bcopy(d->d_typename, ptr + 8, 16);
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bcopy(d->d_packname, ptr + 24, 16);
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le32enc(ptr + 40, d->d_secsize);
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le32enc(ptr + 44, d->d_nsectors);
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le32enc(ptr + 48, d->d_ntracks);
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le32enc(ptr + 52, d->d_ncylinders);
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le32enc(ptr + 56, d->d_secpercyl);
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le32enc(ptr + 60, d->d_secperunit);
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le16enc(ptr + 64, d->d_sparespertrack);
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le16enc(ptr + 66, d->d_sparespercyl);
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le32enc(ptr + 68, d->d_acylinders);
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le16enc(ptr + 72, d->d_rpm);
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le16enc(ptr + 74, d->d_interleave);
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le16enc(ptr + 76, d->d_trackskew);
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le16enc(ptr + 78, d->d_cylskew);
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le32enc(ptr + 80, d->d_headswitch);
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le32enc(ptr + 84, d->d_trkseek);
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le32enc(ptr + 88, d->d_flags);
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le32enc(ptr + 92, d->d_drivedata[0]);
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le32enc(ptr + 96, d->d_drivedata[1]);
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le32enc(ptr + 100, d->d_drivedata[2]);
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le32enc(ptr + 104, d->d_drivedata[3]);
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le32enc(ptr + 108, d->d_drivedata[4]);
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le32enc(ptr + 112, d->d_spare[0]);
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le32enc(ptr + 116, d->d_spare[1]);
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le32enc(ptr + 120, d->d_spare[2]);
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le32enc(ptr + 124, d->d_spare[3]);
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le32enc(ptr + 128, d->d_spare[4]);
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le32enc(ptr + 132, d->d_magic2);
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le16enc(ptr + 136, 0);
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le16enc(ptr + 138, d->d_npartitions);
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le32enc(ptr + 140, d->d_bbsize);
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le32enc(ptr + 144, d->d_sbsize);
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for (i = 0; i < d->d_npartitions; i++)
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bsd_partition_le_enc(ptr + 148 + 16 * i, &d->d_partitions[i]);
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pe = ptr + 148 + 16 * d->d_npartitions;
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sum = 0;
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for (p = ptr; p < pe; p += 2)
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sum ^= le16dec(p);
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le16enc(ptr + 136, sum);
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}
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