/**
     * SMB2 protocol header template with magic number 0xFE 'SMB'
     */
    public static final byte[] SMB2_HEADER = { (byte) 0xFE, (byte) 'S', (byte) 'M', (byte) 'B', // ProtocolId
            (byte) 64, (byte) 0x00, // StructureSize (LE)
            (byte) 0x00, (byte) 0x00, // CreditCharge (reserved 2.0.2)

     */
    private void buildHeader(byte[] buf, int start, int status, int command, long sessionId) {
        System.arraycopy(SMBUtil.SMB2_HEADER, 0, buf, start, SMBUtil.SMB2_HEADER.length);
        // Status at +8
        SMBUtil.writeInt4(status, buf, start + 8);
        // Command at +12
        SMBUtil.writeInt2(command, buf, start + 12);