118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/*-
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* Copyright (c) 2007 Oliver Lehmann <oliver@FreeBSD.org>
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: crc.c,v 1.3 2007/04/16 17:20:32 olivleh1 Exp $
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*/
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#include <stdio.h>
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#ifndef SEEK_SET
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#define SEEK_SET 0
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#endif
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static void usage();
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main(argc, argv)
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char **argv;
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{
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char d,e,a1,a2;
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int i,c = 0;
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int begin = 0;
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int end = -1;
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int f;
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char *filename;
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if(argc < 2 || argc > 4 )
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usage(argv[1]);
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filename = argv[1];
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if(argc > 2)
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begin = atoi(argv[2]);
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if(argc > 3)
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end = atoi(argv[3]);
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if( end != -1 && begin > end ) {
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fprintf(stderr, "begin adress cannot be higher than end adress\n");
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usage(argv[1]);
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}
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f = open(filename, 0);
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if (f<0) {
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fprintf(stderr, "cannot open %s \n", filename);
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usage(argv[1]);
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}
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d=0xff; e=0xff;
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while( read(f, &a1, sizeof(a1)) ) {
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if( c == end )
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break;
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if( c >= begin ) {
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a1=a1 ^ d;
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d=a1;
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for (i=0;i<4;i++)
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{if ((a1 & 1)> 0) {a1=a1 >> 1; a1=a1 | 0x80;}
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else {a1=a1 >> 1; a1=a1 & 0x7f;}}
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a1=a1 & 0x0f;
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a1=a1 ^ d;
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d=a1;
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for (i=0;i<3;i++)
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{if ((a1 & 1)>0) {a1=a1 >> 1; a1=a1 | 0x80;}
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else {a1=a1 >> 1; a1=a1 & 0x7f;}}
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a2=a1;
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a1=a1 & 0x1f;
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a1=a1 ^ e;
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e=a1;
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a1=a2;
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if ((a1 & 1)>0) {a1=a1 >> 1; a1=a1 | 0x80;}
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else {a1=a1 >> 1; a1=a1 & 0x7f;}
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a1=a1 & 0xf0;
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a1=a1 ^ e;
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e=a1;
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a1=a2;
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a1=a1 & 0xe0;
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a1=a1 ^ d;
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d=e;
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e=a1;
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a1=0xff;
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}
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c++;
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}
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close(f);
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printf ("%s %02x%02x\n","crc_checksum:",d & 0xff,e & 0xff);
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return 0;
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}
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static void usage(progname)
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char *progname;
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{
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printf("usage: %s file [start adress] [end adress]\n", progname);
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exit(1);
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}
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