unsigned long xdl_adler32(unsigned long adler, unsigned char const *buf,
                          unsigned int len)
{
   int           k;
   unsigned long s1 = adler & 0xffff;
   unsigned long s2 = (adler >> 16) & 0xffff;

   if (!buf)
   {
      return(1);
   }

   while (len > 0)
   {
      k    = len < NMAX ? len : NMAX;
      len -= k;
      while (k >= 16)
      {
         DO16(buf);
         buf += 16;
         k   -= 16;
      }
      if (k != 0)
      {
         do
         {
            s1 += *buf++;
            s2 += s1;
         } while (--k);
      }
      s1 %= BASE;
      s2 %= BASE;
   }

   return((s2 << 16) | s1);
}

void f()
{
   while (1)
   {
      if (2)
      {
         3;
      }
      else
      {
         4;
      }
   }
}