// Status
        SMBUtil.writeInt4(0, buffer, headerStart + 8);
        // Command (READ = 0x0008)
        SMBUtil.writeInt2(0x0008, buffer, headerStart + 12);
        // Credit request/response
        SMBUtil.writeInt2(1, buffer, headerStart + 14);
        // Flags
        SMBUtil.writeInt4(0, buffer, headerStart + 16);
        // Next command
        SMBUtil.writeInt4(0, buffer, headerStart + 20);

            assertArrayEquals(testFileId, Arrays.copyOfRange(buffer, headerStart + 16, headerStart + 32)); // File ID
            assertEquals(0, SMBUtil.readInt4(buffer, headerStart + 32)); // Channel
            assertEquals(500, SMBUtil.readInt4(buffer, headerStart + 36)); // Remaining bytes
            assertEquals(0, SMBUtil.readInt2(buffer, headerStart + 40)); // WriteChannelInfoOffset

    void testWriteBytesWireFormat() throws Exception {
        // Given
        byte[] buffer = new byte[512];
        int headerStart = 50;
        int bodyOffset = headerStart + Smb2Constants.SMB2_HEADER_LENGTH;

        // Encode the full message to set headerStart
        request.encode(buffer, headerStart);

        // Then - verify the body was written correctly

        } else {

            /*
             * Set bufferIndex according to andxOffset
             */

            bufferIndex = headerStart + andxOffset;

            andx.headerStart = headerStart;
            andx.command = andxCommand;
            andx.errorCode = errorCode;
            andx.flags = flags;
            andx.flags2 = flags2;
            andx.tid = tid;

     * bufferIndex, and thus headerStart, would be 4).(NOTE: If one where
     * looking for a way to improve perfomance this is precisly what you
     * would want to do as the jcifs.smb1.netbios.SocketXxxputStream classes
     * arraycopy all data read or written into a new buffer shifted over 4!)
     */

    byte command, flags;

        // Given
        request.setSessionBinding(true);
        byte[] buffer = new byte[512];
        int headerStart = 50;

        // Encode the full message to set headerStart
        request.encode(buffer, headerStart);

        // Then - verify the body was written correctly
        int bodyOffset = headerStart + Smb2Constants.SMB2_HEADER_LENGTH;

        // Verify structure size (25)

            this.retainPayload = retain;
        }

        public byte[] getRawPayload() {
            return rawPayload;
        }

        // Expose headerStart for testing
        public int getHeaderStart() {
            return headerStart;
        }
    }

    /**
     * Test implementation of SmbComNTCreateAndXResponse for testing
     */

        SMBUtil.writeInt4(8, buffer, bufferIndex + 4);

        response = spy(response);
        when(response.getHeaderStart()).thenReturn(headerStart);

        // Write FileInternalInfo data at calculated offset (headerStart + bufferOffset)
        SMBUtil.writeInt8(0xFEDCBA9876543210L, buffer, headerStart + 300);

        int result = response.readBytesWireFormat(buffer, bufferIndex);

    private void setHeaderStart(Smb2ChangeNotifyResponse response, int headerStart) throws Exception {
        Method method = ServerMessageBlock2.class.getDeclaredMethod("getHeaderStart");
        method.setAccessible(true);

        Field field = ServerMessageBlock2.class.getDeclaredField("headerStart");
        field.setAccessible(true);
        field.setInt(response, headerStart);
    }

    /**

            System.arraycopy(buffer, bufferIndex, this.txn_buf, this.bufParameterStart + this.parameterDisplacement, this.parameterCount);
            bufferIndex += this.parameterCount;
        }
        if (this.dataCount > 0) {
            bufferIndex += this.pad1 = this.dataOffset - (bufferIndex - this.headerStart);