sbool fileContainsBytes(File f, byte[] data) {
  CircularByteBuffer buf = new(max(data, 65536));
  temp BufferedInputStream in = bufferedFileInputStream(data);
  int b, l = l(data);
  long counter;
  while ((b = in.read()) >= 0) {
    buf.add(b);
    ++counter;
    if (buf.size() >= l)
      for i to l: {
        long start = counter-l;
        if (buf.get(start+i) != data[i])
          continue bigLoop;
        true;
      }
  }
  false;
}