)

  /**
   * Lookup table for valid flags for DATA, HEADERS, CONTINUATION. Invalid combinations are
   * represented in binary.
   */
  private val FLAGS = arrayOfNulls<String>(0x40) // Highest bit flag is 0x20.
  private val BINARY =
    Array(256) {
      format("%8s", Integer.toBinaryString(it)).replace(' ', '0')
    }

  init {
    FLAGS[FLAG_NONE] = ""
    FLAGS[FLAG_END_STREAM] = "END_STREAM"