#include<assert.h>
#include<stdio.h>
#include<stdlib.h>
#include<time.h>

int main(void)
{
   FILE *outfile;
   int i, j, x, z;
   unsigned char string[1024];

   srand((unsigned)time(NULL));

   /* Create file of uniform content*/
   outfile = fopen("large1.dat", "wb+");
   assert(outfile != NULL);
   while( (x = rand() & 0xff) == 0 );
   for(i = 0; i < 0x4000; i++)
      fputc(x, outfile);
   fclose(outfile);

   /* Create file with long runs */
   outfile = fopen("large2.dat", "wb+");
   assert(outfile != NULL);
   for(i = 0; i < 32; i++)
   {
      x = rand() & 0xff;
      z = rand() & 0x3c0;
      for(j = 0; j < z; j++)
         fputc(x, outfile);
   }
   fclose(outfile);

   /* Create file with bursty noise */
   outfile = fopen("large3.dat", "wb+");
   x = rand() & 0xff;
   for(i = 0; i < 0x10000; i++)
   {
      if( (rand() & 0xff) == 0 )
      {
         fputc(rand() & 0xff, outfile);
         if( (rand() & 1) == 0 )
            fputc(rand() & 0xff, outfile);
      }
      else
      {
         fputc(x, outfile);
      }
   }
   fclose(outfile);

   /* Create file with almost recurrent patterns */
   outfile = fopen("large4.dat", "wb+");
   for(i = 0; i < 1024; string[i++] = (char)(rand() & 0xff));
   for(i = 0; i < 64; i++)
   {
      fwrite(string, 1024 - (rand() & 15), 1, outfile);
      fputc(rand() & 0xff, outfile);
   }
   fclose(outfile);

   return 0;
}