var b1 = length
    if (isClient) {
      b1 = b1 or B1_FLAG_MASK
      sinkBuffer.writeByte(b1)

      random.nextBytes(maskKey!!)
      sinkBuffer.write(maskKey)

      if (length > 0) {
        val payloadStart = sinkBuffer.size
        sinkBuffer.write(payload)

        sinkBuffer.readAndWriteUnsafe(maskCursor!!)
        maskCursor.seek(payloadStart)
        toggleMask(maskCursor, maskKey)

    }

    /**
     * Calculate average write latency in microseconds
     *
     * @return average write latency
     */
    public double getAverageWriteLatencyMicros() {
        long writes = rdmaWrites.get();
        if (writes == 0) {
            return 0.0;
        }
        return totalWriteTime.get() / (double) writes / 1000.0; // Convert to microseconds
    }

    /**

		offset = 0

		// We have written all the blocks, write the last remaining block.
		if write < int64(len(block)) {
			n, err := dst.Write(block[:write])
			if err != nil {
				return 0, err
			}
			totalWritten += int64(n)
			break
		}

		// Copy the block.
		n, err := dst.Write(block)
		if err != nil {
			return 0, err
		}

		// Decrement output size.
		write -= int64(n)

		// Increment written.

		return
	}
	// write "Path"
	err = en.Append(0xa4, 0x50, 0x61, 0x74, 0x68)
	if err != nil {
		return
	}
	err = en.WriteString(z.Path)
	if err != nil {
		err = msgp.WrapError(err, "Path")
		return
	}
	// write "Creds"
	err = en.Append(0xa5, 0x43, 0x72, 0x65, 0x64, 0x73)
	if err != nil {
		return
	}
	// map header, size 3
	// write "AccessKey"

		return
	}
	// write "Bytes"
	err = en.Append(0xa5, 0x42, 0x79, 0x74, 0x65, 0x73)
	if err != nil {
		return
	}
	err = en.WriteFloat64(z.Curr.Bytes)
	if err != nil {
		err = msgp.WrapError(err, "Curr", "Bytes")
		return
	}
	// write "aq"
	err = en.Append(0xa2, 0x61, 0x71)
	if err != nil {
		return
	}
	// map header, size 2
	// write "Count"

				// concurrently, check for it before we
				// write the filler byte.
				select {
				case err := <-doneCh:
					if err != nil {
						write([]byte{1})
						write([]byte(err.Error()))
					} else {
						write([]byte{0})
					}
					return
				default:
				}

				// Response not ready, write a filler byte.
				write([]byte{32})
				if canWrite {
					xhttp.Flush(w)
				}

      )
    val bufferA = Buffer()
    val bufferB = Buffer()
    bufferA.writeUtf8("Dodgson!\n")
    operatorA.write(0, bufferA, 9)
    bufferB.writeUtf8("You shouldn't use my name.\n")
    operatorB.write(9, bufferB, 27)
    bufferA.writeUtf8("Dodgson, we've got Dodgson here!\n")
    operatorA.write(36, bufferA, 33)
    operatorB.read(0, bufferB, 9)
    assertThat(bufferB.readUtf8()).isEqualTo("Dodgson!\n")

  fun connectionPreface() {
    withLock {
      if (closed) throw IOException("closed")
      if (!client) return // Nothing to write; servers don't send connection headers!
      if (logger.isLoggable(FINE)) {
        logger.fine(format(">> CONNECTION ${CONNECTION_PREFACE.hex()}"))
      }
      sink.write(CONNECTION_PREFACE)
      sink.flush()
    }
  }

  /** Applies `peerSettings` and then sends a settings ACK. */

      val body = part.body

      sink!!.write(DASHDASH)
      sink.write(boundaryByteString)
      sink.write(CRLF)

      if (headers != null) {
        for (h in 0 until headers.size) {
          sink
            .writeUtf8(headers.name(h))
            .write(COLONSPACE)
            .writeUtf8(headers.value(h))
            .write(CRLF)
        }
      }

	disk.MakeVol(t.Context(), volume)

	writer := newBitrotWriter(disk, "", volume, filePath, 35, bitrotAlgo, 10)

	_, err = writer.Write([]byte("aaaaaaaaaa"))
	if err != nil {
		t.Fatal(err)
	}
	_, err = writer.Write([]byte("aaaaaaaaaa"))
	if err != nil {
		t.Fatal(err)
	}
	_, err = writer.Write([]byte("aaaaaaaaaa"))
	if err != nil {
		t.Fatal(err)
	}
	_, err = writer.Write([]byte("aaaaa"))
	if err != nil {