bswap.c revision 1.1
1 /* $NetBSD: bswap.c,v 1.1 2010/01/05 15:45:26 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (c) 2009 Izumi Tsutsui. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 /* 28 * Copyright (c) 1982, 1986, 1988 Regents of the University of California. 29 * All rights reserved. 30 * 31 * Redistribution and use in source and binary forms, with or without 32 * modification, are permitted provided that the following conditions 33 * are met: 34 * 1. Redistributions of source code must retain the above copyright 35 * notice, this list of conditions and the following disclaimer. 36 * 2. Redistributions in binary form must reproduce the above copyright 37 * notice, this list of conditions and the following disclaimer in the 38 * documentation and/or other materials provided with the distribution. 39 * 3. Neither the name of the University nor the names of its contributors 40 * may be used to endorse or promote products derived from this software 41 * without specific prior written permission. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 * 55 * @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91 56 */ 57 58 #if HAVE_NBTOOL_CONFIG_H 59 #include "nbtool_config.h" 60 #endif 61 62 #include <sys/types.h> 63 #if HAVE_NBTOOL_CONFIG_H 64 #include <nbinclude/sys/disklabel.h> 65 #else 66 #include <sys/disklabel.h> 67 #endif /* HAVE_NBTOOL_CONFIG_H */ 68 69 #include "bswap.h" 70 #include "dkcksum.h" 71 72 #if TARGET_BYTE_ORDER != BYTE_ORDER 73 static void bswaplabel(struct disklabel *nlp, struct disklabel *olp); 74 75 void 76 bswaplabel(struct disklabel *nlp, struct disklabel *olp) 77 { 78 int i; 79 80 nlp->d_magic = bswap32(olp->d_magic); 81 nlp->d_type = bswap16(olp->d_type); 82 nlp->d_subtype = bswap16(olp->d_subtype); 83 84 /* no need to swap char strings */ 85 memcpy(nlp->d_typename, olp->d_typename, sizeof(nlp->d_typename)); 86 87 /* XXX What should we do for d_un (an union of char and pointers) ? */ 88 memcpy(nlp->d_packname, olp->d_packname, sizeof(nlp->d_packname)); 89 90 nlp->d_secsize = bswap32(olp->d_secsize); 91 nlp->d_nsectors = bswap32(olp->d_nsectors); 92 nlp->d_ntracks = bswap32(olp->d_ntracks); 93 nlp->d_ncylinders = bswap32(olp->d_ncylinders); 94 nlp->d_secpercyl = bswap32(olp->d_secpercyl); 95 nlp->d_secperunit = bswap32(olp->d_secperunit); 96 97 nlp->d_sparespertrack = bswap16(olp->d_sparespertrack); 98 nlp->d_sparespercyl = bswap16(olp->d_sparespercyl); 99 100 nlp->d_acylinders = bswap32(olp->d_acylinders); 101 102 nlp->d_rpm = bswap16(olp->d_rpm); 103 nlp->d_interleave = bswap16(olp->d_interleave); 104 nlp->d_trackskew = bswap16(olp->d_trackskew); 105 nlp->d_cylskew = bswap16(olp->d_cylskew); 106 nlp->d_headswitch = bswap32(olp->d_headswitch); 107 nlp->d_trkseek = bswap32(olp->d_trkseek); 108 nlp->d_flags = bswap32(olp->d_flags); 109 110 for (i = 0; i < NDDATA; i++) 111 nlp->d_drivedata[i] = bswap32(olp->d_drivedata[i]); 112 113 for (i = 0; i < NSPARE; i++) 114 nlp->d_spare[i] = bswap32(olp->d_spare[i]); 115 116 nlp->d_magic2 = bswap32(olp->d_magic2); 117 nlp->d_checksum = bswap16(olp->d_checksum); 118 119 /* filesystem and partition information: */ 120 nlp->d_npartitions = bswap16(olp->d_npartitions); 121 nlp->d_bbsize = bswap32(olp->d_bbsize); 122 nlp->d_sbsize = bswap32(olp->d_sbsize); 123 124 for (i = 0; i < MAXPARTITIONS; i++) { 125 nlp->d_partitions[i].p_size = 126 bswap32(olp->d_partitions[i].p_size); 127 nlp->d_partitions[i].p_offset = 128 bswap32(olp->d_partitions[i].p_offset); 129 nlp->d_partitions[i].p_fsize = 130 bswap32(olp->d_partitions[i].p_fsize); 131 /* p_fstype and p_frag is uint8_t, so no need to swap */ 132 nlp->d_partitions[i].p_fstype = olp->d_partitions[i].p_fstype; 133 nlp->d_partitions[i].p_frag = olp->d_partitions[i].p_frag; 134 nlp->d_partitions[i].p_cpg = 135 bswap16(olp->d_partitions[i].p_cpg); 136 } 137 } 138 139 void 140 targettohlabel(struct disklabel *hlp, struct disklabel *tlp) 141 { 142 143 bswaplabel(hlp, tlp); 144 /* update checksum in host endian */ 145 hlp->d_checksum = 0; 146 hlp->d_checksum = dkcksum(hlp); 147 } 148 149 void 150 htotargetlabel(struct disklabel *tlp, struct disklabel *hlp) 151 { 152 153 bswaplabel(tlp, hlp); 154 /* update checksum in target endian */ 155 tlp->d_checksum = 0; 156 tlp->d_checksum = dkcksum_re(tlp); 157 } 158 159 uint16_t 160 dkcksum_re(struct disklabel *lp) 161 { 162 uint16_t npartitions; 163 164 /* we can assume lp is reversed, but check it again for sanity */ 165 if (lp->d_magic == DISKMAGIC) 166 npartitions = lp->d_npartitions; 167 else if (bswap32(lp->d_magic) == DISKMAGIC) 168 npartitions = bswap16(lp->d_npartitions); 169 else 170 npartitions = 0; 171 172 if (npartitions > MAXPARTITIONS) 173 npartitions = 0; 174 175 return dkcksum_sized(lp, npartitions); 176 } 177 #endif 178
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