/// <summary>
        /// Deep copy constructor.
        /// </summary>
        public SmbOpenRequestPacket(SmbOpenRequestPacket packet)
            : base(packet)
        {
            this.InitDefaultValue();

            this.smbParameters.WordCount        = packet.SmbParameters.WordCount;
            this.smbParameters.AccessMode       = packet.SmbParameters.AccessMode;
            this.smbParameters.SearchAttributes = packet.SmbParameters.SearchAttributes;

            this.smbData.ByteCount    = packet.SmbData.ByteCount;
            this.smbData.BufferFormat = packet.SmbData.BufferFormat;

            if (packet.smbData.FileName != null)
            {
                this.smbData.FileName = new byte[packet.smbData.FileName.Length];
                Array.Copy(packet.smbData.FileName, this.smbData.FileName, packet.smbData.FileName.Length);
            }
            else
            {
                this.smbData.FileName = new byte[0];
            }
        }
        /// <summary>
        /// Deep copy constructor.
        /// </summary>
        public SmbOpenRequestPacket(SmbOpenRequestPacket packet)
            : base(packet)
        {
            this.InitDefaultValue();

            this.smbParameters.WordCount = packet.SmbParameters.WordCount;
            this.smbParameters.AccessMode = packet.SmbParameters.AccessMode;
            this.smbParameters.SearchAttributes = packet.SmbParameters.SearchAttributes;

            this.smbData.ByteCount = packet.SmbData.ByteCount;
            this.smbData.BufferFormat = packet.SmbData.BufferFormat;

            if (packet.smbData.FileName != null)
            {
                this.smbData.FileName = new byte[packet.smbData.FileName.Length];
                Array.Copy(packet.smbData.FileName, this.smbData.FileName, packet.smbData.FileName.Length);
            }
            else
            {
                this.smbData.FileName = new byte[0];
            }
        }
        /// <summary>
        /// to create a Open request packet.
        /// </summary>
        /// <param name="messageId">This field SHOULD be the multiplex ID that is used to associate a response with
        /// a request.</param>
        /// <param name="uid">This field SHOULD identify the authenticated instance of the user.</param>
        /// <param name="treeId">This field identifies the subdirectory (or tree) on the server that the client is 
        /// accessing.</param>
        /// <param name="flags">An 8-bit field of 1-bit flags describing various features in effect for the 
        /// message</param>
        /// <param name="flags2">A 16-bit field of 1-bit flags that represent various features in effect for the 
        /// message. Unspecified bits are reserved and MUST be zero.</param>
        /// <param name="accessMode">A 16-bit field for encoding the requested access mode. See section 3.2.4.5.1 
        /// for a discussion on sharing modes.</param>
        /// <param name="searchAttributes">SMB_FILE_ATTRIBUTES  Specifies the type of file desired. This field is 
        /// used as a search mask. Both the FileName and the SearchAttributes of a file MUST match for the file to 
        /// be opened. </param>
        /// <param name="fileName">STRING A null-terminated string containing the file name of the file to be 
        /// opened.</param>
        /// <returns> to create a Open request packet.</returns>
        public SmbOpenRequestPacket CreateOpenRequest(
            ushort messageId,
            ushort uid,
            ushort treeId,
            SmbFlags flags,
            SmbFlags2 flags2,
            AccessMode accessMode,
            SmbFileAttributes searchAttributes,
            string fileName)
        {
            if (fileName == null)
            {
                fileName = string.Empty;
            }

            SmbOpenRequestPacket packet = new SmbOpenRequestPacket();

            packet.SmbHeader = CifsMessageUtils.CreateSmbHeader(SmbCommand.SMB_COM_OPEN,
                messageId, uid, treeId, flags, flags2);

            SMB_COM_OPEN_Request_SMB_Parameters smbParameters = new SMB_COM_OPEN_Request_SMB_Parameters();
            smbParameters.AccessMode = (ushort)accessMode;
            smbParameters.SearchAttributes = searchAttributes;
            smbParameters.WordCount = (byte)(Marshal.SizeOf(smbParameters) / NumBytesOfWord);

            SMB_COM_OPEN_Request_SMB_Data smbData = new SMB_COM_OPEN_Request_SMB_Data();
            smbData.BufferFormat = (byte)DataBufferFormat.SmbString;
            smbData.FileName = CifsMessageUtils.ToSmbStringBytes(fileName,
                (flags2 & SmbFlags2.SMB_FLAGS2_UNICODE) == SmbFlags2.SMB_FLAGS2_UNICODE);
            smbData.ByteCount = (ushort)(Marshal.SizeOf(smbData.BufferFormat) + smbData.FileName.Length);

            packet.SmbParameters = smbParameters;
            packet.SmbData = smbData;

            return packet;
        }
        public SmbOpenResponsePacket CreateOpenResponse(
            CifsServerPerConnection connection,
            SmbOpenRequestPacket request,
            uint fileSize,
            UTime lastModified)
        {
            SmbOpenResponsePacket response = new SmbOpenResponsePacket();
            response.SmbHeader = CifsMessageUtils.CreateSmbHeader(connection, request);

            SMB_COM_OPEN_Response_SMB_Parameters smbParameters = response.SmbParameters;

            smbParameters.AccessMode = request.SmbParameters.AccessMode;
            smbParameters.FID = (ushort)connection.GenerateFID();
            smbParameters.FileAttrs = request.SmbParameters.SearchAttributes;
            smbParameters.FileSize = fileSize;
            smbParameters.LastModified = lastModified;

            smbParameters.WordCount = (byte)(TypeMarshal.GetBlockMemorySize(smbParameters) / 2);
            response.SmbParameters = smbParameters;

            return response;
        }