filewebresponse.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 / filewebresponse.cs / 1 / filewebresponse.cs
                        

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

namespace System.Net { 
    using System.Runtime.Serialization; 
    using System.IO;
    using System.Globalization; 
    using System.Security.Permissions;

    [Serializable]
    public class FileWebResponse : WebResponse, ISerializable, ICloseEx 
    {
        const int DefaultFileStreamBufferSize = 8192; 
        const string DefaultFileContentType = "application/octet-stream"; 

    // fields 

        bool m_closed;
        long m_contentLength;
        FileAccess m_fileAccess; 
        WebHeaderCollection m_headers;
        Stream m_stream; 
        Uri m_uri; 

    // constructors 

        internal FileWebResponse(FileWebRequest request, Uri uri, FileAccess access, bool asyncHint) {
            GlobalLog.Enter("FileWebResponse::FileWebResponse", "uri="+uri+", access="+access+", asyncHint="+asyncHint);
            try { 
                m_fileAccess = access;
                if (access == FileAccess.Write) { 
                    m_stream = Stream.Null; 
                } else {
 
                    //
                    // apparently, specifying async when the stream will be read
                    // synchronously, or vice versa, can lead to a 10x perf hit.
                    // While we don't know how the app will read the stream, we 
                    // use the hint from whether the app called BeginGetResponse
                    // or GetResponse to supply the async flag to the stream ctor 
                    // 

                    m_stream = new FileWebStream(request, 
                                                 uri.LocalPath,
                                                 FileMode.Open,
                                                 FileAccess.Read,
                                                 FileShare.Read, 
                                                 DefaultFileStreamBufferSize,
                                                 asyncHint 
                                                 ); 
                    m_contentLength = m_stream.Length;
                } 
                m_headers = new WebHeaderCollection(WebHeaderCollectionType.FileWebResponse);
                m_headers.AddInternal(HttpKnownHeaderNames.ContentLength, m_contentLength.ToString(NumberFormatInfo.InvariantInfo));
                m_headers.AddInternal(HttpKnownHeaderNames.ContentType, DefaultFileContentType);
                m_uri = uri; 
            } catch (Exception e) {
                Exception ex = new WebException(e.Message, e, WebExceptionStatus.ConnectFailure, null); 
                GlobalLog.LeaveException("FileWebResponse::FileWebResponse", ex); 
                throw ex;
            } 
            catch {
                Exception ex = new WebException(string.Empty, new Exception(SR.GetString(SR.net_nonClsCompliantException)), WebExceptionStatus.ConnectFailure, null);
                GlobalLog.LeaveException("FileWebResponse::FileWebResponse", ex);
                throw ex; 
            }
            GlobalLog.Leave("FileWebResponse::FileWebResponse"); 
        } 

        // 
        // ISerializable constructor
        //
        [Obsolete("Serialization is obsoleted for this type. http://go.microsoft.com/fwlink/?linkid=14202")]
        protected FileWebResponse(SerializationInfo serializationInfo, StreamingContext streamingContext):base(serializationInfo, streamingContext) { 
            m_headers       = (WebHeaderCollection)serializationInfo.GetValue("headers", typeof(WebHeaderCollection));
            m_uri           = (Uri)serializationInfo.GetValue("uri", typeof(Uri)); 
            m_contentLength = serializationInfo.GetInt64("contentLength"); 
            m_fileAccess    = (FileAccess )serializationInfo.GetInt32("fileAccess");
        } 

        //
        // ISerializable method
        // 
        /// 
        [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter, SerializationFormatter=true)] 
        void ISerializable.GetObjectData(SerializationInfo serializationInfo, StreamingContext streamingContext) 
        {
            GetObjectData(serializationInfo, streamingContext); 
        }

        //
        // FxCop: provide some way for derived classes to access GetObjectData even if the derived class 
        // explicitly re-inherits ISerializable.
        // 
        [SecurityPermission(SecurityAction.Demand, SerializationFormatter=true)] 
        protected override void GetObjectData(SerializationInfo serializationInfo, StreamingContext streamingContext)
        { 
            serializationInfo.AddValue("headers", m_headers, typeof(WebHeaderCollection));
            serializationInfo.AddValue("uri", m_uri, typeof(Uri));
            serializationInfo.AddValue("contentLength", m_contentLength);
            serializationInfo.AddValue("fileAccess", m_fileAccess); 
            base.GetObjectData(serializationInfo, streamingContext);
        } 
 
    // properties
 
        public override long ContentLength {
            get {
                CheckDisposed();
                return m_contentLength; 
            }
        } 
 
        public override string ContentType {
            get { 
                CheckDisposed();
                return DefaultFileContentType;
            }
        } 

        public override WebHeaderCollection Headers { 
            get { 
                CheckDisposed();
                return m_headers; 
            }
        }

        public override Uri ResponseUri { 
            get {
                CheckDisposed(); 
                return m_uri; 
            }
        } 

    // methods

        private void CheckDisposed() { 
            if (m_closed) {
                throw new ObjectDisposedException(this.GetType().FullName); 
            } 
        }
 
        public override void Close() {
            ((ICloseEx)this).CloseEx(CloseExState.Normal);
        }
 
        void ICloseEx.CloseEx(CloseExState closeState) {
            GlobalLog.Enter("FileWebResponse::Close()"); 
            try { 
                if (!m_closed) {
                    m_closed = true; 

                    Stream chkStream = m_stream;
                    if (chkStream!=null) {
                        if (chkStream is ICloseEx) 
                            ((ICloseEx)chkStream).CloseEx(closeState);
                        else 
                            chkStream.Close(); 
                        m_stream = null;
                    } 
                }
            }
            finally {
                GlobalLog.Leave("FileWebResponse::Close()"); 
            }
        } 
 
        public override Stream GetResponseStream() {
            GlobalLog.Enter("FileWebResponse::GetResponseStream()"); 
            try {
                CheckDisposed();
            }
            finally { 
                GlobalLog.Leave("FileWebResponse::GetResponseStream()");
            } 
            return m_stream; 
        }
    } 
}

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