_FtpDataStream.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / _FtpDataStream.cs / 1 / _FtpDataStream.cs
                        
                        
                            // ------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// ----------------------------------------------------------------------------- 
//
 
namespace System.Net { 

    using System.IO; 
    using System.Net.Sockets;
    using System.Security.Permissions;

 
    /// 
    ///  
    ///     The FtpDataStream class implements a data FTP connection, 
    /// 
    ///  
    internal class FtpDataStream : Stream, ICloseEx {

        private FtpWebRequest    m_Request;
        private NetworkStream    m_NetworkStream; 
        private bool             m_Writeable;
        private bool             m_Readable; 
        private bool             m_IsFullyRead = false; 
        bool                     m_Closing = false;
 

        internal FtpDataStream(NetworkStream networkStream, FtpWebRequest request, TriState writeOnly)  {
            GlobalLog.Print("FtpDataStream#" + ValidationHelper.HashString(this) + "::FtpDataStream");
            m_Readable = true; 
            m_Writeable = true;
            if (writeOnly == TriState.True) { 
                m_Readable = false; 
            } else if (writeOnly == TriState.False) {
                m_Writeable = false; 
            }
            m_NetworkStream = networkStream;
            m_Request = request;
        } 

        protected override void Dispose(bool disposing) 
        { 
            try {
                if (disposing) 
                    ((ICloseEx)this).CloseEx(CloseExState.Normal);
                else
                    ((ICloseEx)this).CloseEx(CloseExState.Abort | CloseExState.Silent);
            } 
            finally {
                base.Dispose(disposing); 
            } 
        }
 
        void ICloseEx.CloseEx(CloseExState closeState) {
            GlobalLog.Print("FtpDataStream#" + ValidationHelper.HashString(this) + "::CloseEx, state = " + closeState.ToString());

            lock (this) 
            {
                if (m_Closing == true) 
                    return; 
                m_Closing = true;
                m_Writeable = false; 
                m_Readable = false;
            }

            try { 
                try {
                    if ((closeState & CloseExState.Abort) == 0) 
                        m_NetworkStream.Close(Socket.DefaultCloseTimeout); 
                    else
                        m_NetworkStream.Close(0); 
                } finally {
                    m_Request.DataStreamClosed(closeState);
                }
            } 
            catch (Exception exception) {
                bool doThrow = true; 
                WebException webException = exception as WebException; 
                if (webException != null) {
                    FtpWebResponse response = webException.Response as FtpWebResponse; 
                    if (response != null)
                    {
                        if (!m_IsFullyRead
                            && response.StatusCode == FtpStatusCode.ConnectionClosed) 
                            doThrow = false;
                    } 
                } 

                if (doThrow) 
                    if ((closeState & CloseExState.Silent) == 0)
                        throw;
            }
        } 

        ///  
        ///    Rethrows the exception 
        /// 
        private void CheckError() { 
            if (m_Request.Aborted) {
                throw new WebException(
                              NetRes.GetWebStatusString(
                                  "net_requestaborted", 
                                  WebExceptionStatus.RequestCanceled),
                              WebExceptionStatus.RequestCanceled); 
            } 
        }
 

        /// 
        ///    Indicates that data can be read from the stream.
        ///  
        public override bool CanRead {
            get { 
                return m_Readable; 
            }
        } 

        /// 
        ///    Indicates that the stream is seekable
        ///  
        public override bool CanSeek {
            get { 
                return m_NetworkStream.CanSeek; 
            }
        } 


        /// 
        ///    Indicates that the stream is writeable 
        /// 
        public override bool CanWrite { 
            get { 
                return m_Writeable;
            } 
        }

        /// 
        ///    Indicates that the stream is writeable 
        /// 
        public override long Length { 
            get { 
                return m_NetworkStream.Length;
            } 
        }

        /// 
        ///    Gets or sets the position in the stream. Always throws . 
        /// 
        public override long Position { 
            get { 
                return m_NetworkStream.Position;
            } 

            set {
                m_NetworkStream.Position = value;
            } 
        }
 
        ///  
        ///    Seeks a specific position in the stream.
        ///  
        public override long Seek(long offset, SeekOrigin origin) {
            CheckError();
            try {
                return m_NetworkStream.Seek(offset, origin); 
            } catch {
                CheckError(); 
                throw; 
            }
        } 


        /// 
        ///     Reads data from the stream.  
        /// 
        public override int Read(byte[] buffer, int offset, int size) { 
            CheckError(); 
            int readBytes;
            try { 
                readBytes = m_NetworkStream.Read(buffer, offset, size);
            } catch {
                CheckError();
                throw; 
            }
            if (readBytes == 0) 
            { 
                m_IsFullyRead = true;
                Close(); 
            }
            return readBytes;
        }
 

        ///  
        ///    Writes data to the stream. 
        /// 
       public override void Write(byte[] buffer, int offset, int size) { 
            CheckError();
            try {
                m_NetworkStream.Write(buffer, offset, size);
            } catch { 
                CheckError();
                throw; 
            } 
        }
 

        private void AsyncReadCallback(IAsyncResult ar)
        {
            LazyAsyncResult userResult = (LazyAsyncResult) ar.AsyncState; 
            try {
                try { 
                    int readBytes = m_NetworkStream.EndRead(ar); 
                    if (readBytes == 0)
                    { 
                        m_IsFullyRead = true;
                        Close(); // This should block for pipeline completion
                    }
                    userResult.InvokeCallback(readBytes); 
                }
                catch (Exception exception) { 
                    // Complete with error. If already completed rethrow on the worker thread 
                    if (!userResult.IsCompleted)
                        userResult.InvokeCallback(exception); 
                }
            } catch {}
        }
 
        /// 
        ///     
        ///       Begins an asychronous read from a stream. 
        ///    
        ///  
        [HostProtection(ExternalThreading=true)]
        public override IAsyncResult BeginRead(byte[] buffer, int offset, int size, AsyncCallback callback, Object state) {
            CheckError();
            LazyAsyncResult userResult = new LazyAsyncResult(this, state, callback); 
            try {
                m_NetworkStream.BeginRead(buffer, offset, size, new AsyncCallback(AsyncReadCallback), userResult); 
            } catch { 
                CheckError();
                throw; 
            }
            return userResult;
        }
 
        /// 
        ///     
        ///       Handle the end of an asynchronous read. 
        ///    
        ///  
        public override int EndRead(IAsyncResult ar) {
            try {
                object result = ((LazyAsyncResult)ar).InternalWaitForCompletion();
 
                if (result is Exception)
                    throw (Exception) result; 
 
                return (int)result;
 
            }
            finally {
                CheckError();
            } 
        }
 
        ///  
        ///    
        ///       Begins an asynchronous write to a stream. 
        ///    
        /// 
        [HostProtection(ExternalThreading=true)]
        public override IAsyncResult BeginWrite(byte[] buffer, int offset, int size, AsyncCallback callback, Object state) { 
            CheckError();
            try { 
                return m_NetworkStream.BeginWrite(buffer, offset, size, callback, state); 
            } catch {
                CheckError(); 
                throw;
            }
        }
 
        /// 
        ///     
        ///       Handle the end of an asynchronous write. 
        ///    
        ///  
        public override void EndWrite(IAsyncResult asyncResult) {
            try {
                m_NetworkStream.EndWrite(asyncResult);
            } 
            finally {
                CheckError(); 
            } 
        }
 
        /// 
        ///    
        ///       Flushes data from the stream.
        ///     
        /// 
        public override void Flush() { 
            m_NetworkStream.Flush(); 
        }
 
        /// 
        ///    
        ///       Sets the length of the stream. Always throws 
        ///       . 
        ///    
        ///  
        public override void SetLength(long value) { 
            m_NetworkStream.SetLength(value);
        } 

        /// 
        ///    Indicates whether we can timeout
        ///  
        public override bool CanTimeout {
            get { 
                return m_NetworkStream.CanTimeout; 
            }
        } 


        /// 
        ///    Set/Get ReadTimeout 
        /// 
        public override int ReadTimeout { 
            get { 
                return m_NetworkStream.ReadTimeout;
            } 
            set {
                m_NetworkStream.ReadTimeout = value;
            }
        } 

        ///  
        ///    Set/Get WriteTimeout 
        /// 
        public override int WriteTimeout { 
            get {
                return m_NetworkStream.WriteTimeout;
            }
            set { 
                m_NetworkStream.WriteTimeout = value;
            } 
        } 

        internal void SetSocketTimeoutOption(SocketShutdown mode, int timeout, bool silent) { 
            m_NetworkStream.SetSocketTimeoutOption(mode, timeout, silent);
        }
    }
}
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