maskCursor.close()
      }
    } else {
      sinkBuffer.writeByte(b1)
      sinkBuffer.write(payload)
    }

    sink.flush()
  }

  @Throws(IOException::class)
  fun writeMessageFrame(
    formatOpcode: Int,
    data: ByteString,
  ) {
    if (writerClosed) throw IOException("closed")

    messageBuffer.write(data)

    var b0 = formatOpcode or B0_FLAG_FIN

        }
      }
    }

    try {
      if (pong != null) {
        writer!!.writePong(pong)
      } else if (messageOrClose is Message) {
        val message = messageOrClose
        writer!!.writeMessageFrame(message.formatOpcode, message.data)
        synchronized(this) {
          queueSize -= message.data.size.toLong()
        }
      } else if (messageOrClose is Close) {
        val close = messageOrClose