// Get frame length, optionally reading from follow-up bytes if indicated by special values.
    frameLength = (b1 and B1_MASK_LENGTH).toLong()
    if (frameLength == PAYLOAD_SHORT.toLong()) {
      frameLength = (source.readShort() and 0xffff).toLong() // Value is unsigned.
    } else if (frameLength == PAYLOAD_LONG.toLong()) {
      frameLength = source.readLong()
      if (frameLength < 0L) {
        throw ProtocolException(

            }
          }
        }

        else -> {
          throw ProtocolException("unsupported address type: $addressType")
        }
      }

    val port = fromSource.readShort() and 0xffff

    when (command) {
      COMMAND_CONNECT -> {
        val toSocket = Socket(toAddress, port)
        val localAddress = toSocket.localAddress.address
        if (localAddress.size != 4) {

    assertEquals(100, in.readByte());
    assertEquals(-100, in.readByte());
    assertEquals(200, in.readUnsignedByte());
    assertEquals('\u6100', in.readChar());
    assertEquals(-12150, in.readShort());
    assertEquals(20675, in.readUnsignedShort());
    assertEquals(0xBEBAFECA, in.readInt());
    assertEquals(0xBEBAFECAEFBEADDEL, in.readLong());
    assertThat(in.readUTF()).isEqualTo("Herby Derby");

    assertEquals(100, in.readByte());
    assertEquals(-100, in.readByte());
    assertEquals(200, in.readUnsignedByte());
    assertEquals('\u6100', in.readChar());
    assertEquals(-12150, in.readShort());
    assertEquals(20675, in.readUnsignedShort());
    assertEquals(0xBEBAFECA, in.readInt());
    assertEquals(0xBEBAFECAEFBEADDEL, in.readLong());
    assertThat(in.readUTF()).isEqualTo("Herby Derby");

    assertEquals(100, in.readByte());
    assertEquals(-100, in.readByte());
    assertEquals(200, in.readUnsignedByte());
    assertEquals('\u6100', in.readChar());
    assertEquals(-12150, in.readShort());
    assertEquals(20675, in.readUnsignedShort());
    assertEquals(0xBEBAFECA, in.readInt());
    assertEquals(0xBEBAFECAEFBEADDEL, in.readLong());
    assertThat(in.readUTF()).isEqualTo("Herby Derby");

      try {
        return input.readUnsignedByte();
      } catch (IOException e) {
        throw new IllegalStateException(e);
      }
    }

    @Override
    public short readShort() {
      try {
        return input.readShort();
      } catch (IOException e) {
        throw new IllegalStateException(e);
      }
    }

    @Override
    public int readUnsignedShort() {
      try {

      return
    }

    if (length % 6 != 0) throw IOException("TYPE_SETTINGS length % 6 != 0: $length")
    val settings = Settings()
    for (i in 0 until length step 6) {
      val id = source.readShort() and 0xffff
      val value = source.readInt()

      when (id) {
        // SETTINGS_HEADER_TABLE_SIZE
        1 -> {
        }

        // SETTINGS_ENABLE_PUSH
        2 -> {

    Inet4Address server = getInet4Address(Arrays.copyOfRange(bytes, 4, 8));

    int flags = ByteStreams.newDataInput(bytes, 8).readShort() & 0xffff;

    // Teredo obfuscates the mapped client port, per section 4 of the RFC.
    int port = ~ByteStreams.newDataInput(bytes, 10).readShort() & 0xffff;

    byte[] clientBytes = Arrays.copyOfRange(bytes, 12, 16);
    for (int i = 0; i < clientBytes.length; i++) {