115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
/*-
|
|
* Copyright (c) 2007 Oliver Lehmann <oliver@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* $Id: crc.c,v 1.2 2007/04/16 04:12:11 olivleh1 Exp $
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
|
|
static void usage(char *);
|
|
|
|
int main(int argc, char **argv) {
|
|
char d,e,a1,a2;
|
|
int i,begin=0,end=-1,c;
|
|
FILE *f;
|
|
char *filename;
|
|
|
|
if(argc < 2 || argc > 4 )
|
|
usage(argv[0]);
|
|
|
|
filename = argv[1];
|
|
|
|
if(argc > 2)
|
|
begin = atoi(argv[2]);
|
|
|
|
if(argc > 3)
|
|
end = atoi(argv[3]);
|
|
|
|
if( end != -1 && begin > end ) {
|
|
fprintf(stderr, "begin adress cannot be higher than end adress\n");
|
|
usage(argv[0]);
|
|
}
|
|
|
|
if( ! ( f = fopen(filename, "rb") ) ) {
|
|
fprintf(stderr, "cannot open %s \n", filename);
|
|
usage(argv[0]);
|
|
}
|
|
|
|
fseek(f,begin,SEEK_SET);
|
|
|
|
d=0xff; e=0xff;
|
|
|
|
c=begin;
|
|
|
|
while(!feof(f)) {
|
|
if( end != -1 && c == end )
|
|
break;
|
|
else
|
|
c++;
|
|
a1 = fgetc(f);
|
|
if( ferror(f) ) {
|
|
printf("File error\n");
|
|
break;
|
|
}
|
|
if( feof(f) ) {
|
|
break;
|
|
}
|
|
a1=a1 ^ d;
|
|
d=a1;
|
|
for (i=0;i<4;i++)
|
|
{if ((a1 & 1)> 0) {a1=a1 >> 1; a1=a1 | 0x80;}
|
|
else {a1=a1 >> 1; a1=a1 & 0x7f;}}
|
|
a1=a1 & 0x0f;
|
|
a1=a1 ^ d;
|
|
d=a1;
|
|
for (i=0;i<3;i++)
|
|
{if ((a1 & 1)>0) {a1=a1 >> 1; a1=a1 | 0x80;}
|
|
else {a1=a1 >> 1; a1=a1 & 0x7f;}}
|
|
a2=a1;
|
|
a1=a1 & 0x1f;
|
|
a1=a1 ^ e;
|
|
e=a1;
|
|
a1=a2;
|
|
if ((a1 & 1)>0) {a1=a1 >> 1; a1=a1 | 0x80;}
|
|
else {a1=a1 >> 1; a1=a1 & 0x7f;}
|
|
a1=a1 & 0xf0;
|
|
a1=a1 ^ e;
|
|
e=a1;
|
|
a1=a2;
|
|
a1=a1 & 0xe0;
|
|
a1=a1 ^ d;
|
|
d=e;
|
|
e=a1;
|
|
}
|
|
fclose(f);
|
|
printf ("%s %02x%02x\n","crc_checksum:",d & 0xff,e & 0xff);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void usage(char *progname) {
|
|
printf("usage: %s file [start adress] [end adress]\n", progname);
|
|
exit(1);
|
|
}
|