1 /* $NetBSD: sparkcrc.c,v 1.1 2004/06/08 21:43:40 abs Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by David Brownlee 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <err.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <sys/types.h> 43 44 /* 45 * Trivial progarm to generate a crc suitable for use in a sparkive file 46 * Based on an algorithm by David Schwaderer 47 */ 48 49 uint16_t crclookup[256] = { 50 0, 49345, 49537, 320, 49921, 960, 640, 49729, 50689, 1728, 51 1920, 51009, 1280, 50625, 50305, 1088, 52225, 3264, 3456, 52 52545, 3840, 53185, 52865, 3648, 2560, 51905, 52097, 2880, 53 51457, 2496, 2176, 51265, 55297, 6336, 6528, 55617, 6912, 54 56257, 55937, 6720, 7680, 57025, 57217, 8000, 56577, 7616, 55 7296, 56385, 5120, 54465, 54657, 5440, 55041, 6080, 5760, 56 54849, 53761, 4800, 4992, 54081, 4352, 53697, 53377, 4160, 57 61441, 12480, 12672, 61761, 13056, 62401, 62081, 12864, 58 13824, 63169, 63361, 14144, 62721, 13760, 13440, 62529, 59 15360, 64705, 64897, 15680, 65281, 16320, 16000, 65089, 60 64001, 15040, 15232, 64321, 14592, 63937, 63617, 14400, 61 10240, 59585, 59777, 10560, 60161, 11200, 10880, 59969, 62 60929, 11968, 12160, 61249, 11520, 60865, 60545, 11328, 63 58369, 9408, 9600, 58689, 9984, 59329, 59009, 9792, 8704, 64 58049, 58241, 9024, 57601, 8640, 8320, 57409, 40961, 24768, 65 24960, 41281, 25344, 41921, 41601, 25152, 26112, 42689, 66 42881, 26432, 42241, 26048, 25728, 42049, 27648, 44225, 67 44417, 27968, 44801, 28608, 28288, 44609, 43521, 27328, 68 27520, 43841, 26880, 43457, 43137, 26688, 30720, 47297, 69 47489, 31040, 47873, 31680, 31360, 47681, 48641, 32448, 70 32640, 48961, 32000, 48577, 48257, 31808, 46081, 29888, 71 30080, 46401, 30464, 47041, 46721, 30272, 29184, 45761, 72 45953, 29504, 45313, 29120, 28800, 45121, 20480, 37057, 73 37249, 20800, 37633, 21440, 21120, 37441, 38401, 22208, 74 22400, 38721, 21760, 38337, 38017, 21568, 39937, 23744, 75 23936, 40257, 24320, 40897, 40577, 24128, 23040, 39617, 76 39809, 23360, 39169, 22976, 22656, 38977, 34817, 18624, 77 18816, 35137, 19200, 35777, 35457, 19008, 19968, 36545, 78 36737, 20288, 36097, 19904, 19584, 35905, 17408, 33985, 79 34177, 17728, 34561, 18368, 18048, 34369, 33281, 17088, 80 17280, 33601, 16640, 33217, 32897, 16448 81 }; 82 83 int 84 main(int argc, char **argv) 85 { 86 unsigned char buf[1024]; 87 FILE *fds; 88 int len; 89 int i; 90 int crc = 0; 91 92 if (argc != 2) { 93 fprintf(stderr, "Usage: sparkcrc filename\n"); 94 exit(0); 95 } 96 if (!(fds = fopen(argv[1], "r"))) 97 err(1, "Unable to open file '%s'", argv[1]); 98 while ((len = fread(buf, 1, sizeof(buf), fds))) 99 for (i = 0; i < len; ++i) { 100 crc = (crc >> 8) ^ crclookup[(crc & 0xff) ^ buf[i]]; 101 } 102 fclose(fds); 103 printf("%d\n", (int)crc); 104 return (0); 105 } 106