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new version also compiles with WEGA

This commit is contained in:
Oliver Lehmann 2007-04-16 17:20:32 +00:00
parent 8501c12b43
commit 4826ec2472
1 changed files with 55 additions and 52 deletions
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107
WEGA/contrib/crc.c
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@ -22,21 +22,29 @@
* (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 $
* $Id: crc.c,v 1.3 2007/04/16 17:20:32 olivleh1 Exp $
*/
#include <stdio.h>
static void usage(char *);
#ifndef SEEK_SET
#define SEEK_SET 0
#endif
int main(int argc, char **argv) {
static void usage();
main(argc, argv)
char **argv;
{
char d,e,a1,a2;
int i,begin=0,end=-1,c;
FILE *f;
int i,c = 0;
int begin = 0;
int end = -1;
int f;
char *filename;
if(argc < 2 || argc > 4 )
usage(argv[0]);
usage(argv[1]);
filename = argv[1];
@ -48,67 +56,62 @@ int main(int argc, char **argv) {
if( end != -1 && begin > end ) {
fprintf(stderr, "begin adress cannot be higher than end adress\n");
usage(argv[0]);
usage(argv[1]);
}
if( ! ( f = fopen(filename, "rb") ) ) {
f = open(filename, 0);
if (f<0) {
fprintf(stderr, "cannot open %s \n", filename);
usage(argv[0]);
usage(argv[1]);
}
fseek(f,begin,SEEK_SET);
d=0xff; e=0xff;
c=begin;
while( read(f, &a1, sizeof(a1)) ) {
if( c == end )
break;
while(!feof(f)) {
if( end != -1 && c == end )
break;
else
c++;
a1 = fgetc(f);
if( ferror(f) ) {
printf("File error\n");
break;
if( c >= begin ) {
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;
a1=0xff;
}
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;
c++;
}
fclose(f);
close(f);
printf ("%s %02x%02x\n","crc_checksum:",d & 0xff,e & 0xff);
return 0;
}
static void usage(char *progname) {
static void usage(progname)
char *progname;
{
printf("usage: %s file [start adress] [end adress]\n", progname);
exit(1);
}