DelegatedStream.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / Mail / DelegatedStream.cs / 1 / DelegatedStream.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net 
{ 
    using System;
    using System.Net.Sockets; 
    using System.IO;

    internal class DelegatedStream : Stream
    { 
        Stream stream;
        NetworkStream netStream; 
 
        protected DelegatedStream() {
        } 
        protected DelegatedStream(Stream stream)
        {
            if (stream == null)
                throw new ArgumentNullException("stream"); 

            this.stream = stream; 
            netStream = stream as NetworkStream; 
        }
 
        protected Stream BaseStream
        {
            get
            { 
                return this.stream;
            } 
        } 

        public override bool CanRead 
        {
            get
            {
                return this.stream.CanRead; 
            }
        } 
 
        public override bool CanSeek
        { 
            get
            {
                return this.stream.CanSeek;
            } 
        }
 
        public override bool CanWrite 
        {
            get 
            {
                return this.stream.CanWrite;
            }
        } 

        public override long Length 
        { 
            get
            { 
                if (!CanSeek)
                    throw new NotSupportedException(SR.GetString(SR.SeekNotSupported));

                return this.stream.Length; 
            }
        } 
 
        public override long Position
        { 
            get
            {
                if (!CanSeek)
                    throw new NotSupportedException(SR.GetString(SR.SeekNotSupported)); 

                return this.stream.Position; 
            } 
            set
            { 
                if (!CanSeek)
                    throw new NotSupportedException(SR.GetString(SR.SeekNotSupported));

                this.stream.Position = value; 
            }
        } 
 
        public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
        { 
            if (!CanRead)
                throw new NotSupportedException(SR.GetString(SR.ReadNotSupported));

            IAsyncResult result = null; 

            if(netStream != null){ 
                result = this.netStream.UnsafeBeginRead (buffer, offset, count, callback, state); 
            }
            else{ 
                result = this.stream.BeginRead (buffer, offset, count, callback, state);
            }
            return result;
        } 

        public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state) 
        { 
            if (!CanWrite)
                throw new NotSupportedException(SR.GetString(SR.WriteNotSupported)); 

            IAsyncResult result = null;

            if(netStream != null){ 
                result = this.netStream.UnsafeBeginWrite(buffer, offset, count, callback, state);
            } 
            else{ 
                result = this.stream.BeginWrite (buffer, offset, count, callback, state);
            } 
            return result;
        }

        //This calls close on the inner stream 
        //however, the stream may not be actually closed, but simpy flushed
        public override void Close() 
        { 
            this.stream.Close();
        } 

        public override int EndRead(IAsyncResult asyncResult)
        {
            if (!CanRead) 
                throw new NotSupportedException(SR.GetString(SR.ReadNotSupported));
 
            int read = this.stream.EndRead (asyncResult); 
            return read;
        } 

        public override void EndWrite(IAsyncResult asyncResult)
        {
            if (!CanWrite) 
                throw new NotSupportedException(SR.GetString(SR.WriteNotSupported));
 
            this.stream.EndWrite (asyncResult); 
        }
 
        public override void Flush()
        {
            this.stream.Flush();
        } 

        public override int Read(byte[] buffer, int offset, int count) 
        { 
            if (!CanRead)
                throw new NotSupportedException(SR.GetString(SR.ReadNotSupported)); 

            int read = this.stream.Read(buffer, offset, count);
            return read;
        } 

        public override long Seek(long offset, SeekOrigin origin) 
        { 
            if (!CanSeek)
                throw new NotSupportedException(SR.GetString(SR.SeekNotSupported)); 

            long position = this.stream.Seek(offset, origin);
            return position;
        } 

        public override void SetLength(long value) 
        { 
            if (!CanSeek)
                throw new NotSupportedException(SR.GetString(SR.SeekNotSupported)); 

            this.stream.SetLength(value);
        }
 
        public override void Write(byte[] buffer, int offset, int count)
        { 
            if (!CanWrite) 
                throw new NotSupportedException(SR.GetString(SR.WriteNotSupported));
 
            this.stream.Write(buffer, offset, count);
        }
    }
}

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