cksum.c revision 1.1.1.1.2.2
1 1.1.1.1.2.2 leo /* $NetBSD: cksum.c,v 1.1.1.1.2.2 2000/08/14 07:59:59 leo Exp $ */ 2 1.1.1.1.2.2 leo 3 1.1.1.1.2.2 leo /* 4 1.1.1.1.2.2 leo * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 1.1.1.1.2.2 leo * All rights reserved. 6 1.1.1.1.2.2 leo * 7 1.1.1.1.2.2 leo * This code is derived from software contributed to The NetBSD Foundation 8 1.1.1.1.2.2 leo * by Julian Coleman, Waldi Ravens and Leo Weppelman. 9 1.1.1.1.2.2 leo * 10 1.1.1.1.2.2 leo * Redistribution and use in source and binary forms, with or without 11 1.1.1.1.2.2 leo * modification, are permitted provided that the following conditions 12 1.1.1.1.2.2 leo * are met: 13 1.1.1.1.2.2 leo * 1. Redistributions of source code must retain the above copyright 14 1.1.1.1.2.2 leo * notice, this list of conditions and the following disclaimer. 15 1.1.1.1.2.2 leo * 2. Redistributions in binary form must reproduce the above copyright 16 1.1.1.1.2.2 leo * notice, this list of conditions and the following disclaimer in the 17 1.1.1.1.2.2 leo * documentation and/or other materials provided with the distribution. 18 1.1.1.1.2.2 leo * 3. All advertising materials mentioning features or use of this software 19 1.1.1.1.2.2 leo * must display the following acknowledgement: 20 1.1.1.1.2.2 leo * This product includes software developed by the NetBSD 21 1.1.1.1.2.2 leo * Foundation, Inc. and its contributors. 22 1.1.1.1.2.2 leo * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.1.1.1.2.2 leo * contributors may be used to endorse or promote products derived 24 1.1.1.1.2.2 leo * from this software without specific prior written permission. 25 1.1.1.1.2.2 leo * 26 1.1.1.1.2.2 leo * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.1.1.1.2.2 leo * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.1.1.1.2.2 leo * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.1.1.1.2.2 leo * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.1.1.1.2.2 leo * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.1.1.1.2.2 leo * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.1.1.1.2.2 leo * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.1.1.1.2.2 leo * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.1.1.1.2.2 leo * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.1.1.1.2.2 leo * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.1.1.1.2.2 leo * POSSIBILITY OF SUCH DAMAGE. 37 1.1.1.1.2.2 leo */ 38 1.1.1.1.2.2 leo 39 1.1.1.1.2.2 leo #include "privahdi.h" 40 1.1.1.1.2.2 leo 41 1.1.1.1.2.2 leo /* 42 1.1.1.1.2.2 leo * Disklabel checksum. 43 1.1.1.1.2.2 leo */ 44 1.1.1.1.2.2 leo 45 1.1.1.1.2.2 leo int 46 1.1.1.1.2.2 leo dkcksum (dl) 47 1.1.1.1.2.2 leo struct disklabel *dl; 48 1.1.1.1.2.2 leo { 49 1.1.1.1.2.2 leo u_short *start, *end, sum = 0; 50 1.1.1.1.2.2 leo 51 1.1.1.1.2.2 leo start = (u_short *)dl; 52 1.1.1.1.2.2 leo end = (u_short *)&dl->d_partitions[dl->d_npartitions]; 53 1.1.1.1.2.2 leo while (start < end) 54 1.1.1.1.2.2 leo sum ^= *start++; 55 1.1.1.1.2.2 leo return (sum); 56 1.1.1.1.2.2 leo } 57 1.1.1.1.2.2 leo 58 1.1.1.1.2.2 leo /* 59 1.1.1.1.2.2 leo * AHDI root sector checksum. 60 1.1.1.1.2.2 leo */ 61 1.1.1.1.2.2 leo 62 1.1.1.1.2.2 leo u_int16_t 63 1.1.1.1.2.2 leo ahdi_cksum (buf) 64 1.1.1.1.2.2 leo void *buf; 65 1.1.1.1.2.2 leo { 66 1.1.1.1.2.2 leo u_int16_t *p = (u_int16_t *)buf; 67 1.1.1.1.2.2 leo u_int16_t csum = 0; 68 1.1.1.1.2.2 leo int i; 69 1.1.1.1.2.2 leo 70 1.1.1.1.2.2 leo for (i = 0; i < 256; i++) 71 1.1.1.1.2.2 leo csum += *p++; 72 1.1.1.1.2.2 leo return ((0x1234 - csum) & 0xffff); 73 1.1.1.1.2.2 leo } 74
Indexes created Sat Oct 25 10:09:55 GMT 2025