RemoteWebConfigurationHostStream.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / Configuration / RemoteWebConfigurationHostStream.cs / 1305376 / RemoteWebConfigurationHostStream.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.Configuration { 
    using System.Collections; 
    using System.Configuration;
    using System.Web; 
    using System.Web.Util;
    using System.Security;
    using System.Security.Principal;
    using System.IO; 
    using System.Web.Hosting;
    using System.Runtime.InteropServices; 
    using System.Security.Permissions; 

    [SecurityPermission(SecurityAction.Demand, Unrestricted = true)] 
    internal class RemoteWebConfigurationHostStream : Stream
    {
        private string                      _FileName;
        private string                      _TemplateFileName; 
        private string                      _Server;
        private MemoryStream                _MemoryStream; 
        private bool                        _IsDirty = false; 
        private long                        _ReadTime = 0;
        private WindowsIdentity             _Identity; 
        private string                      _Username;
        private string                      _Domain;
        private string                      _Password;
        private bool                        _streamForWrite; 

        internal RemoteWebConfigurationHostStream(bool streamForWrite, string serverName, string streamName, string templateStreamName, string username, string domain, string password, WindowsIdentity identity) { 
            _Server = serverName; 
            _FileName = streamName;
            _TemplateFileName = templateStreamName; 
            _Username = username;
            _Domain = domain;
            _Password = password;
            _Identity = identity; 
            _streamForWrite = streamForWrite;
        } 
 
        private void Init()
        { 
#if !FEATURE_PAL // FEATURE_PAL does not enable COM
            if (_MemoryStream != null)
                return;
 
            byte[]                            buf     = null;
            WindowsImpersonationContext       wiContext = null; 
 
            try
            { 
                ////////////////////////////////////////////////////////////
                // Step 1: Set the impersonation if required
                if (_Identity != null)
                { 
                    wiContext = _Identity.Impersonate();
                } 
 
                try
                { 
                    IRemoteWebConfigurationHostServer remoteSrv = RemoteWebConfigurationHost.CreateRemoteObject(_Server, _Username, _Domain, _Password);
                    try
                    {
                        // If we open the stream for writing, we only need to get the _ReadTime because 
                        // we will create an empty memory stream for write.
                        buf = remoteSrv.GetData(_FileName, _streamForWrite, out _ReadTime); 
                    } 
                    finally
                    { 
                        while (Marshal.ReleaseComObject(remoteSrv) > 0)
                        {
                        }
                    } 
                }
                catch 
                { 
                    throw;
                } 
                finally
                {
                    if (wiContext != null)
                    { 
                        wiContext.Undo(); // revert impersonation
                    } 
                } 
            }
            catch 
            {
                throw;
            }
 
            if (buf == null || buf.Length < 1)
            { 
                _MemoryStream = new MemoryStream(); 
            }
            else 
            {
                _MemoryStream = new MemoryStream(buf.Length);
                _MemoryStream.Write(buf, 0, buf.Length);
                _MemoryStream.Position = 0; 
            }
#else // !FEATURE_PAL 
            throw new NotSupportedException(); 
#endif // !FEATURE_PAL
        } 

        public override bool CanRead { get { return true; } }
        public override bool CanSeek { get { return true; } }
        public override bool CanWrite { get { return true; } } 
        public override long Length
        { 
            get 
            {
                Init(); 
                return _MemoryStream.Length;
            }
        }
 
        public override long Position
        { 
            get 
            {
                Init(); 
                return _MemoryStream.Position;
            }
            set
            { 
                Init();
                _MemoryStream.Position = value; 
            } 
        }
 
        public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
        {
            Init();
            return _MemoryStream.BeginRead(buffer, offset, count, callback, state); 
        }
 
        public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state) 
        {
            _IsDirty = true; 
            Init();
            if (offset + count > _MemoryStream.Length)
                _MemoryStream.SetLength(offset + count);
            return _MemoryStream.BeginWrite(buffer, offset, count, callback, state); 
        }
 
        protected override void Dispose(bool disposing) 
        {
            try { 
                if (disposing && _MemoryStream != null) {
                    Flush();
                    _MemoryStream.Close();
                } 
            }
            finally { 
                base.Dispose(disposing); 
            }
        } 

        public override System.Runtime.Remoting.ObjRef CreateObjRef(Type requestedType)
        {
            throw new System.Runtime.Remoting.RemotingException(); 
        }
 
        public override int EndRead(IAsyncResult asyncResult) 
        {
            Init(); 
            return _MemoryStream.EndRead(asyncResult);
        }

        public override void EndWrite(IAsyncResult asyncResult) 
        {
            Init(); 
            _MemoryStream.EndWrite(asyncResult); 
        }
 
        public override void Flush()
        {
            // It's a memory stream.  Don't need to flush anything.
        } 

        internal void FlushForWriteCompleted() 
        { 
#if !FEATURE_PAL // FEATURE_PAL does not enable COM
            if (_IsDirty && _MemoryStream != null) 
            {
                WindowsImpersonationContext wiContext = null;

                try 
                {
                    //////////////////////////////////////////////////////////// 
                    // Step 1: Set the impersonation if required 
                    if (_Identity != null)
                    { 
                        wiContext = _Identity.Impersonate();
                    }

                    try 
                    {
                        IRemoteWebConfigurationHostServer remoteSrv = RemoteWebConfigurationHost.CreateRemoteObject(_Server, _Username, _Domain, _Password); 
                        try 
                        {
                            remoteSrv.WriteData(_FileName, _TemplateFileName, _MemoryStream.ToArray(), ref _ReadTime); 
                        }
                        catch
                        {
                            throw; 
                        }
                        finally 
                        { 
                            while (Marshal.ReleaseComObject(remoteSrv) > 0)
                            { 
                            }
                        }
                    }
                    catch 
                    {
                        throw; 
                    } 
                    finally
                    { 
                        if (wiContext != null)
                        {
                            wiContext.Undo();
                        } 
                    }
                } 
                catch 
                {
                    throw; 
                }

                _MemoryStream.Flush();
                _IsDirty = false; 
            }
#else // !FEATURE_PAL 
            throw new NotSupportedException(); 
#endif // !FEATURE_PAL
        } 
        public override object InitializeLifetimeService()
        {
            Init();
            return _MemoryStream.InitializeLifetimeService(); 
        }
 
        public override int Read(byte[] buffer, int offset, int count) 
        {
            Init(); 
            return _MemoryStream.Read(buffer, offset, count);
        }

        public override int ReadByte() 
        {
            Init(); 
            return _MemoryStream.ReadByte(); 
        }
 
        public override long Seek(long offset, SeekOrigin origin)
        {
            Init();
            return _MemoryStream.Seek(offset, origin); 
        }
 
        public override void SetLength(long val) 
        {
            _IsDirty = true; 
            Init();
            _MemoryStream.SetLength(val);
        }
 
        public override void Write(byte[] buffer, int offset, int count)
        { 
            _IsDirty = true; 
            Init();
            if (offset + count > _MemoryStream.Length) 
                _MemoryStream.SetLength(offset + count);
            _MemoryStream.Write(buffer, offset, count);

        } 

        public override void WriteByte(byte val) 
        { 
            _IsDirty = true;
            Init(); 
            _MemoryStream.WriteByte(val);
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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RemoteWebConfigurationHostStream.cs source code in C# .NET

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