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// File written by Michael Niedermayer and its under GPL
// simple file compare program, it finds the number of rounding errors
// and dies if there is a larger error ( ABS(a-b)>1 )
#include <stdio.h>
// FIXME no checks but its just for debuging 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(;;)
{
int c0= fgetc(f0);
int c1= fgetc(f1);
int d= c0-c1;
if(c0<0 && c1<0) break;
if(c0<0 || c1<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 differnce found!\n");
exit(1);
}
if(d) dif++;
}
fclose(f0);
fclose(f1);
printf("%d (+/-1)differences found\n", dif);
exit(0);
}
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