fun writeData(
    streamId: Int,
    outFinished: Boolean,
    buffer: Buffer?,
    byteCount: Long,
  ) {
    // Empty data frames are not flow-controlled.
    if (byteCount == 0L) {
      writer.data(outFinished, streamId, buffer, 0)
      return
    }

    var byteCount = byteCount
    while (byteCount > 0L) {
      var toWrite: Int
      withLock {
        try {

        buf[1] = 0x66; // andxCommand
        ServerMessageBlock.writeInt2(50, buf, 3); // andxOffset
        ServerMessageBlock.writeInt2(20, buf, 9); // byteCount for main block

        // At offset 50, the implementation writes andx.wordCount (0) to buffer
        // Then reads byteCount at offset 51
        ServerMessageBlock.writeInt2(20, buf, 51);

        int n = block.readAndXWireFormat(buf, 0);
        assertTrue(n > 0);

    internal var closed: Boolean = false

    @Throws(IOException::class)
    override fun read(
      sink: Buffer,
      byteCount: Long,
    ): Long {
      require(byteCount >= 0L) { "byteCount < 0: $byteCount" }

      while (true) {
        var tryAgain = false
        var readBytesDelivered = -1L
        var errorExceptionToDeliver: IOException? = null

        SMBUtil.writeInt2(83, buffer, 36); // andxOffset (33 + 50)
        SMBUtil.writeInt2(20, buffer, 42); // byteCount

        // Setup andx command data at offset 83 (absolute position from buffer start)
        buffer[83] = 2; // andx wordCount
        SMBUtil.writeInt2(10, buffer, 88); // andx byteCount

        int length = testBlock.decode(buffer, 0);

        assertTrue(length > 0);

) : ForwardingSink(delegate) {
  private var hasErrors = false

  override fun write(
    source: Buffer,
    byteCount: Long,
  ) {
    if (hasErrors) {
      source.skip(byteCount)
      return
    }
    try {
      super.write(source, byteCount)
    } catch (e: IOException) {
      hasErrors = true
      onException(e)
    }
  }

  override fun flush() {
    if (hasErrors) {

                + Hexdump.toHexString(server.capabilities, 8) + ",serverTime=" + new Date(server.serverTime) + ",serverTimeZone="
                + server.serverTimeZone + ",encryptionKeyLength=" + server.encryptionKeyLength + ",byteCount=" + byteCount
                + ",oemDomainName=" + server.oemDomainName + "]");
    }

    private Source source(Source source) {
      return new ForwardingSource(source) {
        long totalBytesRead = 0L;

        @Override public long read(Buffer sink, long byteCount) throws IOException {
          long bytesRead = super.read(sink, byteCount);
          // read() returns the number of bytes read, or -1 if this source is exhausted.
          totalBytesRead += bytesRead != -1 ? bytesRead : 0;

  ) = onEvent(RequestHeadersEnd(System.nanoTime(), call, request.headers.byteCount()))

  override fun requestBodyStart(call: Call) =
    onEvent(
      RequestBodyStart(
        System.nanoTime(),
        call,
      ),
    )

  override fun requestBodyEnd(
    call: Call,
    byteCount: Long,
  ) = onEvent(RequestBodyEnd(System.nanoTime(), call, byteCount))

  override fun requestFailed(
    call: Call,

      contentType: MediaType? = null,
      offset: Int = 0,
      byteCount: Int = size,
    ): RequestBody {
      checkOffsetAndCount(size.toLong(), offset.toLong(), byteCount.toLong())
      return object : RequestBody() {
        override fun contentType() = contentType

        override fun contentLength() = byteCount.toLong()

        override fun writeTo(sink: BufferedSink) {

          private var completed = false

          override fun write(
            source: Buffer,
            byteCount: Long,
          ) {
            super.write(source, byteCount)
            totalBytesWritten += byteCount
            progressListener.update(totalBytesWritten, contentLength(), completed)
          }

          override fun close() {
            super.close()