clientWriter.writePing("Hello".encodeUtf8())
    assertData("898560b420bb28d14cd70f")
  }

  @Test fun serverEmptyPong() {
    serverWriter.writePong(EMPTY)
    assertData("8a00")
  }

  @Test fun clientEmptyPong() {
    clientWriter.writePong(EMPTY)
    assertData("8a8060b420bb")
  }

  @Test fun serverPongWithPayload() {
    serverWriter.writePong("Hello".encodeUtf8())
    assertData("8a0548656c6c6f")

  /** Send a ping with the supplied [payload]. */
  @Throws(IOException::class)
  fun writePing(payload: ByteString) {
    writeControlFrame(OPCODE_CONTROL_PING, payload)
  }

  /** Send a pong with the supplied [payload]. */
  @Throws(IOException::class)
  fun writePong(payload: ByteString) {
    writeControlFrame(OPCODE_CONTROL_PONG, payload)
  }

  /**

          }
        } else if (messageOrClose == null) {
          return false // The queue is exhausted.
        }
      }
    }

    try {
      if (pong != null) {
        writer!!.writePong(pong)
      } else if (messageOrClose is Message) {
        val message = messageOrClose as Message
        writer!!.writeMessageFrame(message.formatOpcode, message.data)
        synchronized(this) {

    out.write(0xFF & (v >> 24));
  }

  /**
   * Writes a {@code long} as specified by {@link DataOutputStream#writeLong(long)}, except using
   * little-endian byte order.
   *
   * @throws IOException if an I/O error occurs
   */
  @Override
  public void writeLong(long v) throws IOException {
    byte[] bytes = Longs.toByteArray(Long.reverseBytes(v));
    write(bytes, 0, bytes.length);
  }

    val from = nextAddress
    nextAddress += count
    return (from until nextAddress)
      .map {
        return@map InetAddress.getByAddress(
          Buffer().writeLong(0L).writeLong(it).readByteArray(),
        )
      }
  }

  @Override
  void writeByte(int v);

  @Override
  void writeShort(int v);

  @Override
  void writeChar(int v);

  @Override
  void writeInt(int v);

  @Override
  void writeLong(long v);

  @Override
  void writeFloat(float v);

  @Override
  void writeDouble(double v);

  @Override
  void writeChars(String s);

  @Override
  void writeUTF(String s);

  /**

  @Throws(InterruptedException::class)
  fun writePingAndAwaitPong() {
    writePing()
    awaitPong()
  }

  /** For testing: sends a ping to be awaited with [awaitPong]. */
  @Throws(InterruptedException::class)
  fun writePing() {
    this.withLock {
      awaitPingsSent++
    }

    // 0x4f 0x4b 0x6f 0x6b is "OKok".
    writePing(false, AWAIT_PING, 0x4f4b6f6b)
  }

  /** For testing: awaits a pong. */

        int offset = readULong(src, index + 4);
        byte[] buffer = new byte[length];
        System.arraycopy(src, offset, buffer, 0, length);
        return buffer;
    }

    static void writeULong(byte[] dest, int offset, int ulong) {
        dest[offset] = (byte) (ulong & 0xff);
        dest[offset + 1] = (byte) (ulong >> 8 & 0xff);
        dest[offset + 2] = (byte) (ulong >> 16 & 0xff);

        int offset = readULong(src, index + 4);
        byte[] buffer = new byte[length];
        System.arraycopy(src, offset, buffer, 0, length);
        return buffer;
    }


    static void writeULong ( byte[] dest, int offset, int ulong ) {
        dest[ offset ] = (byte) ( ulong & 0xff );
        dest[ offset + 1 ] = (byte) ( ulong >> 8 & 0xff );
        dest[ offset + 2 ] = (byte) ( ulong >> 16 & 0xff );

    out.writeByte(100);
    out.writeByte(-100);
    out.writeByte((byte) 200);
    out.writeChar('a');
    out.writeShort((short) -30000);
    out.writeShort((short) 50000);
    out.writeInt(0xCAFEBABE);
    out.writeLong(0xDEADBEEFCAFEBABEL);
    out.writeUTF("Herby Derby");
    out.writeFloat(Float.intBitsToFloat(0xCAFEBABE));
    out.writeDouble(Double.longBitsToDouble(0xDEADBEEFCAFEBABEL));
  }