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- /*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * 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.
- */
- /*
- * Functions to encode and decode struct disklabel and struct partition into
- * a bytestream of little endianness 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 < d->d_npartitions; 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);
- }
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