1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START 3*7c478bd9Sstevel@tonic-gate * 4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*7c478bd9Sstevel@tonic-gate * with the License. 8*7c478bd9Sstevel@tonic-gate * 9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 12*7c478bd9Sstevel@tonic-gate * and limitations under the License. 13*7c478bd9Sstevel@tonic-gate * 14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*7c478bd9Sstevel@tonic-gate * 20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END 21*7c478bd9Sstevel@tonic-gate */ 22*7c478bd9Sstevel@tonic-gate /* 23*7c478bd9Sstevel@tonic-gate * Copyright (c) 2000 by Sun Microsystems, Inc. 24*7c478bd9Sstevel@tonic-gate * All rights reserved. 25*7c478bd9Sstevel@tonic-gate */ 26*7c478bd9Sstevel@tonic-gate 27*7c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*7c478bd9Sstevel@tonic-gate 29*7c478bd9Sstevel@tonic-gate #include <string.h> 30*7c478bd9Sstevel@tonic-gate #include <limits.h> 31*7c478bd9Sstevel@tonic-gate 32*7c478bd9Sstevel@tonic-gate #include "crcmodel.h" 33*7c478bd9Sstevel@tonic-gate 34*7c478bd9Sstevel@tonic-gate #if defined(LITTLE_ENDIAN) 35*7c478bd9Sstevel@tonic-gate 36*7c478bd9Sstevel@tonic-gate /* Little-endian architectures need byte-swapping. */ 37*7c478bd9Sstevel@tonic-gate 38*7c478bd9Sstevel@tonic-gate #define sws(x) (((x >> 8) & 0x00ff) | ((x << 8) & 0xff00)) 39*7c478bd9Sstevel@tonic-gate #define swl(x) (sws(x >> 16) | (sws(x) << 16)) 40*7c478bd9Sstevel@tonic-gate 41*7c478bd9Sstevel@tonic-gate #define swap_short(x) (x = sws(x)) 42*7c478bd9Sstevel@tonic-gate #define swap_long(x) (x = swl(x)) 43*7c478bd9Sstevel@tonic-gate 44*7c478bd9Sstevel@tonic-gate #else /* if !LITTLE_ENDIAN */ 45*7c478bd9Sstevel@tonic-gate 46*7c478bd9Sstevel@tonic-gate /* Big-endian anchictectures don't need byte-swapping. */ 47*7c478bd9Sstevel@tonic-gate 48*7c478bd9Sstevel@tonic-gate #define sws(x) (x) 49*7c478bd9Sstevel@tonic-gate #define swl(x) (x) 50*7c478bd9Sstevel@tonic-gate 51*7c478bd9Sstevel@tonic-gate #define swap_short(x) (x = sws(x)) 52*7c478bd9Sstevel@tonic-gate #define swap_long(x) (x = swl(x)) 53*7c478bd9Sstevel@tonic-gate 54*7c478bd9Sstevel@tonic-gate #endif /* LITTLE_ENDIAN */ 55*7c478bd9Sstevel@tonic-gate 56*7c478bd9Sstevel@tonic-gate unsigned char 57*7c478bd9Sstevel@tonic-gate compute_crc8(unsigned char *bytes, int length) 58*7c478bd9Sstevel@tonic-gate { 59*7c478bd9Sstevel@tonic-gate cm_t crc_mdl; 60*7c478bd9Sstevel@tonic-gate p_cm_t p_crc; 61*7c478bd9Sstevel@tonic-gate int i; 62*7c478bd9Sstevel@tonic-gate unsigned char aCRC; 63*7c478bd9Sstevel@tonic-gate 64*7c478bd9Sstevel@tonic-gate p_crc = &crc_mdl; 65*7c478bd9Sstevel@tonic-gate 66*7c478bd9Sstevel@tonic-gate p_crc->cm_width = 8; 67*7c478bd9Sstevel@tonic-gate p_crc->cm_poly = 0x107; /* = X^8 + x^2 + x + 1 */ 68*7c478bd9Sstevel@tonic-gate p_crc->cm_init = 0; 69*7c478bd9Sstevel@tonic-gate p_crc->cm_refin = TRUE; 70*7c478bd9Sstevel@tonic-gate p_crc->cm_refot = TRUE; 71*7c478bd9Sstevel@tonic-gate p_crc->cm_xorot = 0; 72*7c478bd9Sstevel@tonic-gate 73*7c478bd9Sstevel@tonic-gate cm_ini(p_crc); 74*7c478bd9Sstevel@tonic-gate 75*7c478bd9Sstevel@tonic-gate for (i = 0; i < length; i++) { 76*7c478bd9Sstevel@tonic-gate cm_nxt(p_crc, bytes[i]); 77*7c478bd9Sstevel@tonic-gate } 78*7c478bd9Sstevel@tonic-gate 79*7c478bd9Sstevel@tonic-gate aCRC = (unsigned char)cm_crc(p_crc); 80*7c478bd9Sstevel@tonic-gate 81*7c478bd9Sstevel@tonic-gate return (aCRC); 82*7c478bd9Sstevel@tonic-gate } 83*7c478bd9Sstevel@tonic-gate 84*7c478bd9Sstevel@tonic-gate uint32_t 85*7c478bd9Sstevel@tonic-gate compute_crc32(unsigned char *bytes, int length) 86*7c478bd9Sstevel@tonic-gate { 87*7c478bd9Sstevel@tonic-gate cm_t crc_mdl; 88*7c478bd9Sstevel@tonic-gate p_cm_t p_crc; 89*7c478bd9Sstevel@tonic-gate int i; 90*7c478bd9Sstevel@tonic-gate uint32_t aCRC; 91*7c478bd9Sstevel@tonic-gate 92*7c478bd9Sstevel@tonic-gate p_crc = &crc_mdl; 93*7c478bd9Sstevel@tonic-gate 94*7c478bd9Sstevel@tonic-gate p_crc->cm_width = 32; 95*7c478bd9Sstevel@tonic-gate p_crc->cm_poly = 0x04c11db7; 96*7c478bd9Sstevel@tonic-gate p_crc->cm_init = 0xffffffff; 97*7c478bd9Sstevel@tonic-gate p_crc->cm_refin = TRUE; 98*7c478bd9Sstevel@tonic-gate p_crc->cm_refot = TRUE; 99*7c478bd9Sstevel@tonic-gate p_crc->cm_xorot = 0xffffffff; 100*7c478bd9Sstevel@tonic-gate 101*7c478bd9Sstevel@tonic-gate cm_ini(p_crc); 102*7c478bd9Sstevel@tonic-gate 103*7c478bd9Sstevel@tonic-gate for (i = 0; i < length; i++) { 104*7c478bd9Sstevel@tonic-gate cm_nxt(p_crc, bytes[i]); 105*7c478bd9Sstevel@tonic-gate } 106*7c478bd9Sstevel@tonic-gate 107*7c478bd9Sstevel@tonic-gate aCRC = (uint32_t)cm_crc(p_crc); 108*7c478bd9Sstevel@tonic-gate 109*7c478bd9Sstevel@tonic-gate return (aCRC); 110*7c478bd9Sstevel@tonic-gate } 111*7c478bd9Sstevel@tonic-gate 112*7c478bd9Sstevel@tonic-gate /* 113*7c478bd9Sstevel@tonic-gate * This is the max value an uint32_t value can hold... 114*7c478bd9Sstevel@tonic-gate * Define this for Windows compilers which don't have "limits.h" or equivalant 115*7c478bd9Sstevel@tonic-gate */ 116*7c478bd9Sstevel@tonic-gate #define UINT32_T_MAX 0xFFFFFFFF 117*7c478bd9Sstevel@tonic-gate 118*7c478bd9Sstevel@tonic-gate uint32_t 119*7c478bd9Sstevel@tonic-gate compute_checksum32(unsigned char *bytes, int length) 120*7c478bd9Sstevel@tonic-gate { 121*7c478bd9Sstevel@tonic-gate uint32_t regval = 0; 122*7c478bd9Sstevel@tonic-gate int i, j, k; 123*7c478bd9Sstevel@tonic-gate uint32_t next4bytes; 124*7c478bd9Sstevel@tonic-gate unsigned char tailbytes[4] = { 0x00, 0x00, 0x00, 0x00 }; 125*7c478bd9Sstevel@tonic-gate 126*7c478bd9Sstevel@tonic-gate /* Grab bytes in 4-byte chunks */ 127*7c478bd9Sstevel@tonic-gate for (i = 0; i < length-4; i += 4) { 128*7c478bd9Sstevel@tonic-gate /* Grab chunk as an int */ 129*7c478bd9Sstevel@tonic-gate (void) memcpy(&next4bytes, &(bytes[i]), 4); 130*7c478bd9Sstevel@tonic-gate swap_long(next4bytes); 131*7c478bd9Sstevel@tonic-gate 132*7c478bd9Sstevel@tonic-gate if (next4bytes > UINT32_T_MAX - regval) { 133*7c478bd9Sstevel@tonic-gate next4bytes -= UINT32_T_MAX - regval; 134*7c478bd9Sstevel@tonic-gate regval = 0; 135*7c478bd9Sstevel@tonic-gate } 136*7c478bd9Sstevel@tonic-gate 137*7c478bd9Sstevel@tonic-gate /* Add intval to regval */ 138*7c478bd9Sstevel@tonic-gate regval += next4bytes; 139*7c478bd9Sstevel@tonic-gate } 140*7c478bd9Sstevel@tonic-gate 141*7c478bd9Sstevel@tonic-gate /* Grab any remaining bytes at the end */ 142*7c478bd9Sstevel@tonic-gate for (j = length-1, k = 3; j >= i; j--, k--) { 143*7c478bd9Sstevel@tonic-gate tailbytes[k] = bytes[j]; 144*7c478bd9Sstevel@tonic-gate } 145*7c478bd9Sstevel@tonic-gate 146*7c478bd9Sstevel@tonic-gate /* 147*7c478bd9Sstevel@tonic-gate * Treat any remaining bytes put into tailbytes as if they were 148*7c478bd9Sstevel@tonic-gate * a left-zero-padded unsigned int (uint32_t == 4 bytes!) 149*7c478bd9Sstevel@tonic-gate */ 150*7c478bd9Sstevel@tonic-gate (void) memcpy(&next4bytes, tailbytes, 4); 151*7c478bd9Sstevel@tonic-gate swap_long(next4bytes); 152*7c478bd9Sstevel@tonic-gate if (next4bytes > UINT32_T_MAX - regval) { 153*7c478bd9Sstevel@tonic-gate next4bytes -= UINT32_T_MAX - regval; 154*7c478bd9Sstevel@tonic-gate regval = 0; 155*7c478bd9Sstevel@tonic-gate } 156*7c478bd9Sstevel@tonic-gate regval += next4bytes; 157*7c478bd9Sstevel@tonic-gate 158*7c478bd9Sstevel@tonic-gate return ((uint32_t)regval); 159*7c478bd9Sstevel@tonic-gate } 160