FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_bsd_enc.c

     /*-
      * 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/cdefs.h>
    __FBSDID("$FreeBSD: releng/11.2/sys/geom/geom_bsd_enc.c 298808 2016-04-29 20:56:58Z pfg $");
    
    #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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