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