void readNullArrayThrows() throws Exception {
            SmbFileInputStream in = newStream();
            assertThrows(NullPointerException.class, () -> in.read(null));
        }

        @Test
        @DisplayName("readDirect with len <= 0 returns 0")
        void readDirectZeroLen() throws Exception {
            SmbFileInputStream in = newStream();
            byte[] buf = new byte[4];

    check(!client) { "Client cannot push requests." }
    return newStream(associatedStreamId, requestHeaders, out)
  }

  /**
   * Returns a new locally-initiated stream.
   *
   * @param out true to create an output stream that we can use to send data to the remote peer.
   *     Corresponds to `FLAG_FIN`.
   */
  @Throws(IOException::class)
  fun newStream(
    requestHeaders: List<Header>,
    out: Boolean,

)

var errDiskStale = errors.New("drive stale")

// To abstract a disk over network.
type storageRESTServer struct {
	endpoint Endpoint
}

var (
	storageCheckPartsRPC       = grid.NewStream[*CheckPartsHandlerParams, grid.NoPayload, *CheckPartsResp](grid.HandlerCheckParts3, func() *CheckPartsHandlerParams { return &CheckPartsHandlerParams{} }, nil, func() *CheckPartsResp { return &CheckPartsResp{} })

	// Ensure remote has the same disk ID.
	opts.DiskID = *client.diskID.Load()
	b, err := opts.MarshalMsg(grid.GetByteBuffer()[:0])
	if err != nil {
		return toStorageErr(err)
	}

	st, err := client.gridConn.NewStream(ctx, grid.HandlerWalkDir, b)
	if err != nil {
		return toStorageErr(err)
	}
	return toStorageErr(st.Results(func(in []byte) error {
		_, err := wr.Write(in)
		return err
	}))
}

	gridConn := client.gridConn()
	if gridConn == nil {
		return
	}

	payload, err := json.Marshal(traceOpts)
	if err != nil {
		bugLogIf(ctx, err)
		return
	}

	st, err := gridConn.NewStream(ctx, grid.HandlerTrace, payload)
	if err != nil {
		return
	}
	st.Results(func(b []byte) error {
		select {
		case traceCh <- b:
		default:
			// Do not block on slow receivers.