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// File written by Michael Niedermayer and it is under GPL.
// Simple file compare program, it finds the number of rounding errors
// and dies if there is too large an error ( ABS(a-b)>1 ).
#include <stdio.h>
// FIXME: No checks but it is just for debugging so who cares ;)
int main(int argc, char **argv)
{
FILE *f0, *f1;
int dif=0;
if(argc!=3)
{
printf("compare <file1> <file2>\n");
exit(2);
}
f0= fopen(argv[1], "rb");
f1= fopen(argv[2], "rb");
for(;;)
{
short c0;
short c1;
int d;
int e0= fread(&c0, 2, 1, f0);
int e1= fread(&c1, 2, 1, f1);
d=c0-c1;
if(e0==0 && e1==0) break;
if(e0==0 || e1==0)
{
printf("FATAL error, files have different size!\n");
exit(1);
}
if(d<0) d=-d; // ABS
if(d>1)
{
printf("FATAL error, too large a difference found (%d)!\n", d);
exit(1);
}
if(d) dif++;
}
fclose(f0);
fclose(f1);
printf("%d (+/-1)differences found\n", dif);
exit(0);
}
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