this.options = WRITE_OPTIONS;
                this.access = SmbConstants.FILE_READ_DATA | SmbConstants.FILE_WRITE_DATA;
            }
            else {
                throw new IllegalArgumentException("Invalid mode");
            }

            try ( SmbFileHandle h = ensureOpen() ) {}
            this.readSize = th.getReceiveBufferSize() - 70;
            this.writeSize = th.getSendBufferSize() - 70;

            write_andx_resp = new SmbComWriteAndXResponse();
            options = WRITE_OPTIONS;
            access = SmbConstants.FILE_READ_DATA | SmbConstants.FILE_WRITE_DATA;
        } else {
            throw new IllegalArgumentException( "Invalid mode" );
        }
        file.open( openFlags, access, SmbFile.ATTR_NORMAL, options );
        readSize = file.tree.session.transport.rcv_buf_size - 70;