distrib/utils/sparkcrc/sparkcrc.c

   1 /*      $NetBSD: sparkcrc.c,v 1.2 2004/11/10 03:57:23 jmc 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  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #if HAVE_NBTOOL_CONFIG_H
  33 #include "nbtool_config.h"
  34 #endif
  35
  36 #include <err.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <sys/types.h>
  40
  41 /*
  42  * Trivial progarm to generate a crc suitable for use in a sparkive file
  43  * Based on an algorithm by David Schwaderer
  44  */
  45
  46 uint16_t crclookup[256] = {
  47         0, 49345, 49537, 320, 49921, 960, 640, 49729, 50689, 1728,
  48         1920, 51009, 1280, 50625, 50305, 1088, 52225, 3264, 3456,
  49         52545, 3840, 53185, 52865, 3648, 2560, 51905, 52097, 2880,
  50         51457, 2496, 2176, 51265, 55297, 6336, 6528, 55617, 6912,
  51         56257, 55937, 6720, 7680, 57025, 57217, 8000, 56577, 7616,
  52         7296, 56385, 5120, 54465, 54657, 5440, 55041, 6080, 5760,
  53         54849, 53761, 4800, 4992, 54081, 4352, 53697, 53377, 4160,
  54         61441, 12480, 12672, 61761, 13056, 62401, 62081, 12864,
  55         13824, 63169, 63361, 14144, 62721, 13760, 13440, 62529,
  56         15360, 64705, 64897, 15680, 65281, 16320, 16000, 65089,
  57         64001, 15040, 15232, 64321, 14592, 63937, 63617, 14400,
  58         10240, 59585, 59777, 10560, 60161, 11200, 10880, 59969,
  59         60929, 11968, 12160, 61249, 11520, 60865, 60545, 11328,
  60         58369, 9408, 9600, 58689, 9984, 59329, 59009, 9792, 8704,
  61         58049, 58241, 9024, 57601, 8640, 8320, 57409, 40961, 24768,
  62         24960, 41281, 25344, 41921, 41601, 25152, 26112, 42689,
  63         42881, 26432, 42241, 26048, 25728, 42049, 27648, 44225,
  64         44417, 27968, 44801, 28608, 28288, 44609, 43521, 27328,
  65         27520, 43841, 26880, 43457, 43137, 26688, 30720, 47297,
  66         47489, 31040, 47873, 31680, 31360, 47681, 48641, 32448,
  67         32640, 48961, 32000, 48577, 48257, 31808, 46081, 29888,
  68         30080, 46401, 30464, 47041, 46721, 30272, 29184, 45761,
  69         45953, 29504, 45313, 29120, 28800, 45121, 20480, 37057,
  70         37249, 20800, 37633, 21440, 21120, 37441, 38401, 22208,
  71         22400, 38721, 21760, 38337, 38017, 21568, 39937, 23744,
  72         23936, 40257, 24320, 40897, 40577, 24128, 23040, 39617,
  73         39809, 23360, 39169, 22976, 22656, 38977, 34817, 18624,
  74         18816, 35137, 19200, 35777, 35457, 19008, 19968, 36545,
  75         36737, 20288, 36097, 19904, 19584, 35905, 17408, 33985,
  76         34177, 17728, 34561, 18368, 18048, 34369, 33281, 17088,
  77         17280, 33601, 16640, 33217, 32897, 16448
  78 };
  79
  80 int
  81 main(int argc, char **argv)
  82 {
  83         unsigned char buf[1024];
  84         FILE *fds;
  85         int len;
  86         int i;
  87         int crc = 0;
  88
  89         if (argc != 2) {
  90                 fprintf(stderr, "Usage: sparkcrc filename\n");
  91                 exit(0);
  92         }
  93         if (!(fds = fopen(argv[1], "r")))
  94                 err(1, "Unable to open file '%s'", argv[1]);
  95         while ((len = fread(buf, 1, sizeof(buf), fds)))
  96                 for (i = 0; i < len; ++i) {
  97                         crc = (crc >> 8) ^ crclookup[(crc & 0xff) ^ buf[i]];
  98                 }
  99         fclose(fds);
 100         printf("%d\n", (int)crc);
 101         return (0);
 102 }