// The file.Read() function will happily read a tiny file in to a large
	// byte slice, but io.ReadFull() will return an
	// error if the file is smaller than the byte slice.
	byteSlice := make([]byte, 2)
	numBytesRead, err := io.ReadFull(file, byteSlice)
	if err != nil {
		log.Fatal(err)
	}
	log.Printf("Number of bytes read: %d\n", numBytesRead)
	log.Printf("Data read: %s\n", byteSlice)