liba52/compare.c

   1 // File written by Michael Niedermayer and its under GPL
   2 // simple file compare program, it finds the number of rounding errors
   3 // and dies if there is a larger error ( ABS(a-b)>1 )
   4
   5 #include <stdio.h>
   6
   7 // FIXME no checks but its just for debuging so who cares ;)
   8
   9 int main(int argc, char **argv)
  10 {
  11         FILE *f0, *f1;
  12         int dif=0;
  13
  14         if(argc!=3)
  15         {
  16                 printf("compare <file1> <file2>\n");
  17                 exit(2);
  18         }
  19
  20         f0= fopen(argv[1], "rb");
  21         f1= fopen(argv[2], "rb");
  22
  23         for(;;)
  24         {
  25                 short c0;
  26                 short c1;
  27                 int d;
  28
  29                 int e0= fread(&c0, 2, 1, f0);
  30                 int e1= fread(&c1, 2, 1, f1);
  31
  32                 d=c0-c1;
  33                 if(e0==0 && e1==0) break;
  34                 if(e0==0 || e1==0)
  35                 {
  36                         printf("FATAL error, files have different size!\n");
  37                         exit(1);
  38                 }
  39
  40                 if(d<0) d=-d; // ABS
  41                 if(d>1)
  42                 {
  43                         printf("FATAL error, too large differnce found (%d)!\n", d);
  44                         exit(1);
  45                 }
  46
  47                 if(d) dif++;
  48         }
  49
  50         fclose(f0);
  51         fclose(f1);
  52
  53         printf("%d (+/-1)differences found\n", dif);
  54         exit(0);
  55 }