HttpWebResponse.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / Net / System / Net / HttpWebResponse.cs / 1 / HttpWebResponse.cs

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

namespace System.Net { 
    using System.IO; 
    using System.IO.Compression;
    using System.Runtime.Serialization; 
    using System.Globalization;
    using System.Security.Cryptography.X509Certificates;
    using System.Security.Permissions;
 
    //
    // HttpWebResponse - Handles retrival of HTTP Response headers, und Data reads. 
    // 

    ///  
    ///    
    ///    An HTTP-specific implementation of the
    ///     class.
    ///  
    /// 
    [Serializable] 
    public class HttpWebResponse : WebResponse, ISerializable 
    {
        // response Uri generated by the request. 
        private Uri m_Uri;
        // response Verb gernated by the request
        private KnownHttpVerb m_Verb;
        // response values 
        private HttpStatusCode m_StatusCode;
        private string m_StatusDescription; 
        // ConnectStream - for reading actual data 
        private Stream m_ConnectStream;
 
        private WebHeaderCollection m_HttpResponseHeaders;

        // Content Length needed for symantics, -1 if chunked
        private long m_ContentLength; 

        // for which response ContentType we will look for and parse the CharacterSet 
        private string m_MediaType; 
        private string m_CharacterSet = null;
 
        private bool m_IsVersionHttp11;

#if !FEATURE_PAL
        // server certificate for secure connections 
        internal X509Certificate m_Certificate;
#endif // !FEATURE_PAL 
 
        private CookieCollection m_cookies;
        private bool m_disposed; // = false; 
        private bool m_propertiesDisposed;
        private bool m_UsesProxySemantics;
        private bool m_IsMutuallyAuthenticated;
 
        //
        // Internal Access to the Response Stream, 
        //  public method is GetResponseStream 
        //
        internal Stream ResponseStream { 
            get {
                return m_ConnectStream;
            }
            set { 
                m_ConnectStream = value;
            } 
        } 
        //
        public override bool IsMutuallyAuthenticated { 
            get {
                return m_IsMutuallyAuthenticated;
            }
        } 
        internal bool InternalSetIsMutuallyAuthenticated {
            set { 
                m_IsMutuallyAuthenticated = value; 
            }
        } 

        /// 
        ///    [To be supplied.]
        ///  
        public CookieCollection Cookies {
            get { 
                CheckDisposed(); 
                if (m_cookies == null) {
                    m_cookies = new CookieCollection(); 
                }
                return m_cookies;
            }
            set { 
                CheckDisposed();
                m_cookies = value; 
            } 
        }
 
        // retreives response header object
        /// 
        ///    
        ///       Gets 
        ///       the headers associated with this response from the server.
        ///     
        ///  
        public override WebHeaderCollection Headers {
            get { 
                return m_HttpResponseHeaders;
            }
        }
 
        // ContentLength, -1 indicates unknown value
        ///  
        ///     
        ///       Gets the lenght of the content returned by the request.
        ///     
        /// 
        public override long ContentLength {
            get {
                return m_ContentLength; 
            }
        } 
 
        /// 
        ///     
        ///       Gets the
        ///       method used to encode the body of the response.
        ///    
        ///  
        public String ContentEncoding {
            get { 
                CheckDisposed(); 
                string contentEncoding = m_HttpResponseHeaders[HttpKnownHeaderNames.ContentEncoding];
                return contentEncoding == null ? string.Empty : contentEncoding; 
            }
        }

        // Returns the Content-Type of the response. 

        ///  
        ///     
        ///       Gets the content type of the
        ///       response. 
        ///    
        /// 
        public override string ContentType {
            get { 
                CheckDisposed();
                string contentType = m_HttpResponseHeaders.ContentType; 
                return contentType == null ? string.Empty : contentType; 
            }
        } 


        /// 
        ///    [To be supplied.] 
        /// 
        public string CharacterSet { 
            get { 
                CheckDisposed();
                string contentType = m_HttpResponseHeaders.ContentType; 

                if (m_CharacterSet == null && !ValidationHelper.IsBlankString(contentType)) {

                    //sets characterset so the branch is never executed again. 
                    m_CharacterSet = String.Empty;
 
                    //first string is the media type 
                    string srchString = contentType.ToLower(CultureInfo.InvariantCulture);
 
                    //media subtypes of text type has a default as specified by rfc 2616
                    if (srchString.Trim().StartsWith("text/")) {
                        m_CharacterSet = "ISO-8859-1";
                    } 

                    //one of the parameters may be the character set 
                    //there must be at least a mediatype for this to be valid 
                    int i = srchString.IndexOf(";");
                    if (i > 0) { 

                        //search the parameters
                        while ((i = srchString.IndexOf("charset",i)) >= 0){
 
                            i+=7;
 
                            //make sure the word starts with charset 
                            if (srchString[i-8] == ';' || srchString[i-8] == ' '){
 
                                //skip whitespace
                                while (i < srchString.Length && srchString[i] == ' ')
                                    i++;
 
                                //only process if next character is '='
                                //and there is a character after that 
                                if (i < srchString.Length - 1 && srchString[i] == '=') { 
                                   i++;
 
                                   //get and trim character set substring
                                   int j = srchString.IndexOf(';',i);
                                   //In the past we used
                                   //Substring(i, j). J is the offset not the length 
                                   //the qfe is to fix the second parameter so that this it is the
                                   //length. since j points to the next ; the operation j -i 
                                   //gives the length of the charset 
                                   if (j>i)
                                       m_CharacterSet = contentType.Substring(i,j - i).Trim(); 
                                   else
                                       m_CharacterSet = contentType.Substring(i).Trim();

                                   //done 
                                   break;
                                } 
                            } 
                        }
                    } 
                }
                return m_CharacterSet;
            }
        } 

        ///  
        ///     
        ///       Gets the name of the server that sent the response.
        ///     
        /// 
        public string Server {
            get {
                CheckDisposed(); 
                string server = m_HttpResponseHeaders.Server;
                return server == null ? string.Empty : server; 
            } 
        }
 
        /// 
        ///    
        ///       Gets the last
        ///       date and time that the content of the response was modified. 
        ///    
        ///  
        public  DateTime LastModified { 
            get {
                CheckDisposed(); 

                string lastmodHeaderValue = m_HttpResponseHeaders.LastModified;

                if (lastmodHeaderValue == null) { 
                    return DateTime.Now;
                } 
                return HttpProtocolUtils.string2date(lastmodHeaderValue); 
            }
        } 

        // returns StatusCode
        /// 
        ///     
        ///       Gets
        ///       a number indicating the status of the response. 
        ///     
        /// 
        public HttpStatusCode StatusCode { 
            get {
                return m_StatusCode;
            }
        } 

        // returns StatusDescription 
        ///  
        ///    
        ///       Gets the status description returned with the response. 
        ///    
        /// 
        public string StatusDescription {
            get { 
                CheckDisposed();
                return m_StatusDescription; 
            } 
        }
 
        // HTTP Version
        /// 
        ///    
        ///       Gets 
        ///       the version of the HTTP protocol used in the response.
        ///     
        ///  
        public Version ProtocolVersion {
            get { 
                CheckDisposed();
                return m_IsVersionHttp11 ? HttpVersion.Version11 : HttpVersion.Version10;
            }
        } 

 
        internal bool KeepAlive { 
            get {
                // 
                // QFE  - DevDiv bug: 37757
                // If there is proxy involved, independen of the Http Version, we should honor the
                // proxy indicated Proxy-Connection header value.
                // This header value is not RFC mandated, but is a legacy from Netscape documentations. 
                // It indicates that the proxy wants to keep the connection.
                // Functionally it is equivalent of a Keep-Alive AND/OR Connection header. 
                // 
                // The absence of this check will result in HTTP/1.0 responsen be considered to be not
                // Keeping the connection alive. 
                //
                // This will result in a state mismatch between the connection pool and HttpWebRequest object
                // when the decision to drain the connection and putting it back to the idle pool is made.
                // 
                if (m_UsesProxySemantics)
                { 
                    string connectionHeader = Headers[HttpKnownHeaderNames.ProxyConnection]; 
                    if (connectionHeader != null)
                    { 
                        return connectionHeader.ToLower(CultureInfo.InvariantCulture).IndexOf("close") < 0 ||
                               connectionHeader.ToLower(CultureInfo.InvariantCulture).IndexOf("keep-alive") >= 0;
                    }
                } 

                if (ProtocolVersion==HttpVersion.Version10) { 
                    string keepAliveHeader = Headers[HttpKnownHeaderNames.KeepAlive]; 
                    return keepAliveHeader!=null;
                } 
                if (ProtocolVersion>=HttpVersion.Version11) {
                    string connectionHeader;
                    connectionHeader = Headers[HttpKnownHeaderNames.Connection];
                    return connectionHeader==null || connectionHeader.ToLower(CultureInfo.InvariantCulture).IndexOf("close")<0 || connectionHeader.ToLower(CultureInfo.InvariantCulture).IndexOf("keep-alive")>=0; 
                }
                return false; 
            } 
        }
 

        /*++

            ResponseStream - Return the response stream. 

            This property returns the response stream for this response. The 
            response stream will do de-chunking, etc. as needed. 

            Input: Nothing. Property is readonly. 

            Returns: Response stream for response.

        --*/ 

 
        ///  
        ///    Gets the stream used for reading the body of the response from the
        ///       server. 
        /// 
        public override Stream GetResponseStream() {
            if(Logging.On)Logging.Enter(Logging.Web, this, "GetResponseStream", "");
            CheckDisposed(); 

            if (!CanGetResponseStream()) 
            { 
                // give a blank stream in the HEAD case, which = 0 bytes of data
                if(Logging.On)Logging.Exit(Logging.Web, this, "GetResponseStream", Stream.Null); 
                return Stream.Null;
            }
            if(Logging.On)Logging.PrintInfo(Logging.Web, "ContentLength="+m_ContentLength);
            if(Logging.On)Logging.Exit(Logging.Web, this, "GetResponseStream", m_ConnectStream); 
            return m_ConnectStream;
        } 
 
        /*++
 
            Close - Closes the Response after the use.

            This causes the read stream to be closed.
 
        --*/
 
        public override void Close() { 
            if(Logging.On)Logging.Enter(Logging.Web, this, "Close", "");
            if (!m_disposed) 
            {
                m_disposed = true;
                Stream stream = m_ConnectStream;
                ICloseEx icloseEx = stream as ICloseEx; 
                if (icloseEx != null)
                { 
                    icloseEx.CloseEx(CloseExState.Normal /* | CloseExState.Silent */); 
                }
                else if (stream != null) 
                {
                    stream.Close();
                }
            } 
            if(Logging.On)Logging.Exit(Logging.Web, this, "Close", "");
        } 
 
        internal void Abort() {
            Stream stream = m_ConnectStream; 
            ICloseEx icloseEx = stream as ICloseEx;
            try
            {
                if (icloseEx != null) { 
                    icloseEx.CloseEx(CloseExState.Abort);
                } 
                else if (stream != null) { 
                    stream.Close();
                } 
            }
            catch { }
        }
 
        // for backward compat
        internal override void OnDispose(){ 
            m_propertiesDisposed = true; 
        }
 
        // true if we success a call to get ResponseStream, note this code
        // is duplicated and should use code out of the HttpWebRequest
        internal bool CanGetResponseStream() {
            return !m_Verb.ExpectNoContentResponse; 

        } 
 

        internal HttpWebResponse(Uri responseUri, KnownHttpVerb verb, CoreResponseData coreData, string mediaType, bool usesProxySemantics, DecompressionMethods decompressionMethod) { 
            m_Uri                       = responseUri;
            m_Verb                      = verb;
            m_MediaType                 = mediaType;
            m_UsesProxySemantics        = usesProxySemantics; 

            m_ConnectStream             = coreData.m_ConnectStream; 
            m_HttpResponseHeaders       = coreData.m_ResponseHeaders; 
            m_ContentLength             = coreData.m_ContentLength;
            m_StatusCode                = coreData.m_StatusCode; 
            m_StatusDescription         = coreData.m_StatusDescription;
            m_IsVersionHttp11           = coreData.m_IsVersionHttp11;

 
            //if the returned contentlength is zero, preemptively invoke calldone on the stream.
            //this will wake up any pending reads. 
            if (m_ContentLength == 0 && m_ConnectStream is ConnectStream) { 
                ((ConnectStream)m_ConnectStream).CallDone();
            } 

            // handle Content-Location header, by combining it with the orginal request.
            string contentLocation = m_HttpResponseHeaders[HttpKnownHeaderNames.ContentLocation];
 
            if (contentLocation != null) {
                try { 
                    m_Uri = new Uri(m_Uri, contentLocation); 
                } catch (UriFormatException e) {
                    GlobalLog.Assert("Exception on response Uri parsing.", e.ToString()); 
                }
            }
            // decompress responses by hooking up a final response Stream - only if user required it
            if(decompressionMethod != DecompressionMethods.None) { 
                string contentEncoding = m_HttpResponseHeaders[HttpKnownHeaderNames.ContentEncoding];
                if (contentEncoding != null){ 
                    if(((decompressionMethod & DecompressionMethods.GZip) != 0) && contentEncoding.IndexOf(HttpWebRequest.GZipHeader) != -1) { 
                        m_ConnectStream = new GZipWrapperStream(m_ConnectStream, CompressionMode.Decompress);
                        m_ContentLength = -1; // unknown on compressed streams 

                        // Setting a response header after parsing will ruin the Common Header optimization.
                        // This seems like a corner case.  ContentEncoding could be added as a common header, with a special
                        // property allowing it to be nulled. 
                        m_HttpResponseHeaders[HttpKnownHeaderNames.ContentEncoding] = null;
                    } 
                    else if (((decompressionMethod & DecompressionMethods.Deflate) != 0) && contentEncoding.IndexOf(HttpWebRequest.DeflateHeader) != -1) { 
                        m_ConnectStream = new DeflateWrapperStream(m_ConnectStream, CompressionMode.Decompress);
                        m_ContentLength = -1; // unknown on compressed streams 

                        // Setting a response header after parsing will ruin the Common Header optimization.
                        // This seems like a corner case.  ContentEncoding could be added as a common header, with a special
                        // property allowing it to be nulled. 
                        m_HttpResponseHeaders[HttpKnownHeaderNames.ContentEncoding] = null;
                    } 
                } 
            }
        } 

        //
        // ISerializable constructor
        // 
        /// 
        ///    [To be supplied.] 
        ///  

        [Obsolete("Serialization is obsoleted for this type.  http://go.microsoft.com/fwlink/?linkid=14202")] 
        protected HttpWebResponse(SerializationInfo serializationInfo, StreamingContext streamingContext):base(serializationInfo, streamingContext) {
            m_HttpResponseHeaders   = (WebHeaderCollection)serializationInfo.GetValue("m_HttpResponseHeaders", typeof(WebHeaderCollection));
            m_Uri                   = (Uri)serializationInfo.GetValue("m_Uri", typeof(Uri));
#if !FEATURE_PAL 
            m_Certificate           = (X509Certificate)serializationInfo.GetValue("m_Certificate", typeof(X509Certificate));
#endif // !FEATURE_PAL 
            Version version         = (Version)serializationInfo.GetValue("m_Version", typeof(Version)); 
            m_IsVersionHttp11       = version.Equals(HttpVersion.Version11);
            m_StatusCode            = (HttpStatusCode)serializationInfo.GetInt32("m_StatusCode"); 
            m_ContentLength         = serializationInfo.GetInt64("m_ContentLength");
            m_Verb                  = KnownHttpVerb.Parse(serializationInfo.GetString("m_Verb"));
            m_StatusDescription     = serializationInfo.GetString("m_StatusDescription");
            m_MediaType             = serializationInfo.GetString("m_MediaType"); 
        }
 
        // 
        // ISerializable method
        // 
        /// 
        [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter, SerializationFormatter=true)]
        void ISerializable.GetObjectData(SerializationInfo serializationInfo, StreamingContext streamingContext)
        { 
            GetObjectData(serializationInfo, streamingContext);
        } 
 
        //
        // FxCop: provide a way for derived classes to access this method even if they reimplement ISerializable. 
        //

        [SecurityPermission(SecurityAction.Demand, SerializationFormatter=true)]
        protected override void GetObjectData(SerializationInfo serializationInfo, StreamingContext streamingContext) 
        {
            // 
            // for now disregard streamingContext. 
            // just Add all the members we need to deserialize to construct
            // the object at deserialization time 
            //
            // the following runtime types already support serialization:
            // Boolean, Char, SByte, Byte, Int16, UInt16, Int32, UInt32, Int64, UInt64, Single, Double, DateTime
            // for the others we need to provide our own serialization 
            //
            serializationInfo.AddValue("m_HttpResponseHeaders", m_HttpResponseHeaders, typeof(WebHeaderCollection)); 
            serializationInfo.AddValue("m_Uri", m_Uri, typeof(Uri)); 
#if !FEATURE_PAL
            serializationInfo.AddValue("m_Certificate", m_Certificate, typeof(X509Certificate)); 
#endif // !FEATURE_PAL
            serializationInfo.AddValue("m_Version", ProtocolVersion, typeof(Version));
            serializationInfo.AddValue("m_StatusCode", m_StatusCode);
            serializationInfo.AddValue("m_ContentLength", m_ContentLength); 
            serializationInfo.AddValue("m_Verb", m_Verb.Name);
            serializationInfo.AddValue("m_StatusDescription", m_StatusDescription); 
            serializationInfo.AddValue("m_MediaType", m_MediaType); 
            base.GetObjectData(serializationInfo, streamingContext);
        } 

        /*++

        Routine Description: 

            Gets response headers from parsed server response 
 
        Arguments:
 
            headerName - HTTP header to search for matching header on.

        Return Value:
 
            string - contains the matched entry, if found
 
        --*/ 
        /// 
        ///     
        ///       Gets a specified header value returned with the response.
        ///    
        /// 
        public string GetResponseHeader( string headerName ) { 
            CheckDisposed();
 
            string headerValue = m_HttpResponseHeaders[headerName]; 

            return ( (headerValue==null) ? String.Empty : headerValue ); 
        }

#if HTTP_HEADER_EXTENSIONS_SUPPORTED
        // searches for extension header in response 
        /// 
        ///    [To be supplied.] 
        ///  
        public string GetExtension(HttpExtension extension, string header) {
            CheckDisposed(); 
            return GetResponseHeader(header);
        }
#endif
 
        /*++
 
            ResponseUri  - Gets the final Response Uri, that includes any 
             changes that may have transpired from the orginal Request
 
            This property returns Uri for this WebResponse.

            Input: Nothing.
 
            Returns: Response Uri for response.
 
                    read-only 

        --*/ 

        /// 
        ///    
        ///       Gets the Uniform Resource Indentifier (Uri) of the resource that returned the 
        ///       response.
        ///     
        ///  
        public override Uri ResponseUri {                               // read-only
            get { 
                CheckDisposed();
                return m_Uri;
            }
        } 

        /* 
            Accessor:   Method 

            Gets/Sets the http method of this request. 
            This method represents the Verb,
            after any redirects

            Returns: Method currently being used. 

 
        */ 
        /// 
        ///     
        ///       Gets the value of the method used to return the response.
        ///    
        /// 
        public string Method { 
            get {
                CheckDisposed(); 
                return m_Verb.Name; 
            }
        } 

        private void CheckDisposed() {
            if (m_propertiesDisposed) {
                throw new ObjectDisposedException(this.GetType().FullName); 
            }
        } 
 
    } // class HttpWebResponse
 
    // transfer ICloseEx behavior to nested compound stream.
    internal class GZipWrapperStream : GZipStream, ICloseEx {

        public GZipWrapperStream(Stream stream, CompressionMode mode) : base( stream, mode, false) { 
        }
 
        void ICloseEx.CloseEx(CloseExState closeState) { 
            ICloseEx icloseEx = BaseStream as ICloseEx;
            if (icloseEx != null) { 
                // since the internal Close() of GZipStream just does Close on our base stream
                // we don't have to call it anymore at this point
                icloseEx.CloseEx(closeState);
            } 
            else {
                Close(); 
            } 
        }
 


        public override IAsyncResult BeginRead(byte[] buffer, int offset, int size, AsyncCallback callback, Object state) {
 
            if (buffer==null) {
                throw new ArgumentNullException("buffer"); 
            } 
            if (offset<0 || offset>buffer.Length) {
                throw new ArgumentOutOfRangeException("offset"); 
            }
            if (size<0 || size>buffer.Length-offset) {
                throw new ArgumentOutOfRangeException("size");
            } 

            try{ 
                return base.BeginRead(buffer, offset, size, callback, state); 
            }
            catch(Exception e){ 
                try{
                    if (NclUtilities.IsFatal(e)) throw;
                    if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){
                        Close(); 
                    }
                } 
                catch{ 
                }
                throw e; 
            }
        }

        public override int EndRead(IAsyncResult asyncResult) { 

            if (asyncResult==null) { 
                throw new ArgumentNullException("asyncResult"); 
            }
 
            try{
                return base.EndRead(asyncResult);
            }
            catch(Exception e){ 
                try{
                    if (NclUtilities.IsFatal(e)) throw; 
                    if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){ 
                        Close();
                    } 
                }
                catch{
                }
                throw e; 
            }
        } 
 
        public override int Read(byte[] buffer, int offset, int size) {
 
            if (buffer==null) {
                throw new ArgumentNullException("buffer");
            }
            if (offset<0 || offset>buffer.Length) { 
                throw new ArgumentOutOfRangeException("offset");
            } 
            if (size<0 || size>buffer.Length-offset) { 
                throw new ArgumentOutOfRangeException("size");
            } 

            try{
                return base.Read(buffer, offset, size);
            } 
            catch(Exception e){
                try{ 
                    if (NclUtilities.IsFatal(e)) throw; 

                    if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){ 
                        Close();
                    }
                }
                catch{ 
                }
                throw e; 
            } 
        }
    } 


    internal class DeflateWrapperStream : DeflateStream, ICloseEx {
 
        public DeflateWrapperStream(Stream stream, CompressionMode mode) : base( stream, mode, false) {
        } 
 
        void ICloseEx.CloseEx(CloseExState closeState) {
            ICloseEx icloseEx = BaseStream as ICloseEx; 
            if (icloseEx != null) {
                // since the internal Close() of GZipStream just does Close on our base stream
                // we don't have to call it anymore at this point
                icloseEx.CloseEx(closeState); 
            }
            else { 
                Close(); 
            }
        } 


        public override IAsyncResult BeginRead(byte[] buffer, int offset, int size, AsyncCallback callback, Object state) {
 
            if (buffer==null) {
                throw new ArgumentNullException("buffer"); 
            } 
            if (offset<0 || offset>buffer.Length) {
                throw new ArgumentOutOfRangeException("offset"); 
            }
            if (size<0 || size>buffer.Length-offset) {
                throw new ArgumentOutOfRangeException("size");
            } 

            try{ 
                return base.BeginRead(buffer, offset, size, callback, state); 
            }
            catch(Exception e){ 
                try{
                    if (NclUtilities.IsFatal(e)) throw;
                    if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){
                        Close(); 
                    }
                } 
                catch{ 
                }
                throw e; 
            }
        }

        public override int EndRead(IAsyncResult asyncResult) { 

            if (asyncResult==null) { 
                throw new ArgumentNullException("asyncResult"); 
            }
 
            try{
                return base.EndRead(asyncResult);
            }
            catch(Exception e){ 
                try{
                    if (NclUtilities.IsFatal(e)) throw; 
                    if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){ 
                        Close();
                    } 
                }
                catch{
                }
                throw e; 
            }
        } 
 
        public override int Read(byte[] buffer, int offset, int size) {
 
            if (buffer==null) {
                throw new ArgumentNullException("buffer");
            }
            if (offset<0 || offset>buffer.Length) { 
                throw new ArgumentOutOfRangeException("offset");
            } 
            if (size<0 || size>buffer.Length-offset) { 
                throw new ArgumentOutOfRangeException("size");
            } 

            try{
                return base.Read(buffer, offset, size);
            } 
            catch(Exception e){
                try{ 
                    if (NclUtilities.IsFatal(e)) throw; 
                    if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){
                        Close(); 
                    }
                }
                catch{
                } 
                throw e;
            } 
        } 
    }
 


} // namespace System.Net

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net { 
    using System.IO; 
    using System.IO.Compression;
    using System.Runtime.Serialization; 
    using System.Globalization;
    using System.Security.Cryptography.X509Certificates;
    using System.Security.Permissions;
 
    //
    // HttpWebResponse - Handles retrival of HTTP Response headers, und Data reads. 
    // 

    ///  
    ///    
    ///    An HTTP-specific implementation of the
    ///     class.
    ///  
    /// 
    [Serializable] 
    public class HttpWebResponse : WebResponse, ISerializable 
    {
        // response Uri generated by the request. 
        private Uri m_Uri;
        // response Verb gernated by the request
        private KnownHttpVerb m_Verb;
        // response values 
        private HttpStatusCode m_StatusCode;
        private string m_StatusDescription; 
        // ConnectStream - for reading actual data 
        private Stream m_ConnectStream;
 
        private WebHeaderCollection m_HttpResponseHeaders;

        // Content Length needed for symantics, -1 if chunked
        private long m_ContentLength; 

        // for which response ContentType we will look for and parse the CharacterSet 
        private string m_MediaType; 
        private string m_CharacterSet = null;
 
        private bool m_IsVersionHttp11;

#if !FEATURE_PAL
        // server certificate for secure connections 
        internal X509Certificate m_Certificate;
#endif // !FEATURE_PAL 
 
        private CookieCollection m_cookies;
        private bool m_disposed; // = false; 
        private bool m_propertiesDisposed;
        private bool m_UsesProxySemantics;
        private bool m_IsMutuallyAuthenticated;
 
        //
        // Internal Access to the Response Stream, 
        //  public method is GetResponseStream 
        //
        internal Stream ResponseStream { 
            get {
                return m_ConnectStream;
            }
            set { 
                m_ConnectStream = value;
            } 
        } 
        //
        public override bool IsMutuallyAuthenticated { 
            get {
                return m_IsMutuallyAuthenticated;
            }
        } 
        internal bool InternalSetIsMutuallyAuthenticated {
            set { 
                m_IsMutuallyAuthenticated = value; 
            }
        } 

        /// 
        ///    [To be supplied.]
        ///  
        public CookieCollection Cookies {
            get { 
                CheckDisposed(); 
                if (m_cookies == null) {
                    m_cookies = new CookieCollection(); 
                }
                return m_cookies;
            }
            set { 
                CheckDisposed();
                m_cookies = value; 
            } 
        }
 
        // retreives response header object
        /// 
        ///    
        ///       Gets 
        ///       the headers associated with this response from the server.
        ///     
        ///  
        public override WebHeaderCollection Headers {
            get { 
                return m_HttpResponseHeaders;
            }
        }
 
        // ContentLength, -1 indicates unknown value
        ///  
        ///     
        ///       Gets the lenght of the content returned by the request.
        ///     
        /// 
        public override long ContentLength {
            get {
                return m_ContentLength; 
            }
        } 
 
        /// 
        ///     
        ///       Gets the
        ///       method used to encode the body of the response.
        ///    
        ///  
        public String ContentEncoding {
            get { 
                CheckDisposed(); 
                string contentEncoding = m_HttpResponseHeaders[HttpKnownHeaderNames.ContentEncoding];
                return contentEncoding == null ? string.Empty : contentEncoding; 
            }
        }

        // Returns the Content-Type of the response. 

        ///  
        ///     
        ///       Gets the content type of the
        ///       response. 
        ///    
        /// 
        public override string ContentType {
            get { 
                CheckDisposed();
                string contentType = m_HttpResponseHeaders.ContentType; 
                return contentType == null ? string.Empty : contentType; 
            }
        } 


        /// 
        ///    [To be supplied.] 
        /// 
        public string CharacterSet { 
            get { 
                CheckDisposed();
                string contentType = m_HttpResponseHeaders.ContentType; 

                if (m_CharacterSet == null && !ValidationHelper.IsBlankString(contentType)) {

                    //sets characterset so the branch is never executed again. 
                    m_CharacterSet = String.Empty;
 
                    //first string is the media type 
                    string srchString = contentType.ToLower(CultureInfo.InvariantCulture);
 
                    //media subtypes of text type has a default as specified by rfc 2616
                    if (srchString.Trim().StartsWith("text/")) {
                        m_CharacterSet = "ISO-8859-1";
                    } 

                    //one of the parameters may be the character set 
                    //there must be at least a mediatype for this to be valid 
                    int i = srchString.IndexOf(";");
                    if (i > 0) { 

                        //search the parameters
                        while ((i = srchString.IndexOf("charset",i)) >= 0){
 
                            i+=7;
 
                            //make sure the word starts with charset 
                            if (srchString[i-8] == ';' || srchString[i-8] == ' '){
 
                                //skip whitespace
                                while (i < srchString.Length && srchString[i] == ' ')
                                    i++;
 
                                //only process if next character is '='
                                //and there is a character after that 
                                if (i < srchString.Length - 1 && srchString[i] == '=') { 
                                   i++;
 
                                   //get and trim character set substring
                                   int j = srchString.IndexOf(';',i);
                                   //In the past we used
                                   //Substring(i, j). J is the offset not the length 
                                   //the qfe is to fix the second parameter so that this it is the
                                   //length. since j points to the next ; the operation j -i 
                                   //gives the length of the charset 
                                   if (j>i)
                                       m_CharacterSet = contentType.Substring(i,j - i).Trim(); 
                                   else
                                       m_CharacterSet = contentType.Substring(i).Trim();

                                   //done 
                                   break;
                                } 
                            } 
                        }
                    } 
                }
                return m_CharacterSet;
            }
        } 

        ///  
        ///     
        ///       Gets the name of the server that sent the response.
        ///     
        /// 
        public string Server {
            get {
                CheckDisposed(); 
                string server = m_HttpResponseHeaders.Server;
                return server == null ? string.Empty : server; 
            } 
        }
 
        /// 
        ///    
        ///       Gets the last
        ///       date and time that the content of the response was modified. 
        ///    
        ///  
        public  DateTime LastModified { 
            get {
                CheckDisposed(); 

                string lastmodHeaderValue = m_HttpResponseHeaders.LastModified;

                if (lastmodHeaderValue == null) { 
                    return DateTime.Now;
                } 
                return HttpProtocolUtils.string2date(lastmodHeaderValue); 
            }
        } 

        // returns StatusCode
        /// 
        ///     
        ///       Gets
        ///       a number indicating the status of the response. 
        ///     
        /// 
        public HttpStatusCode StatusCode { 
            get {
                return m_StatusCode;
            }
        } 

        // returns StatusDescription 
        ///  
        ///    
        ///       Gets the status description returned with the response. 
        ///    
        /// 
        public string StatusDescription {
            get { 
                CheckDisposed();
                return m_StatusDescription; 
            } 
        }
 
        // HTTP Version
        /// 
        ///    
        ///       Gets 
        ///       the version of the HTTP protocol used in the response.
        ///     
        ///  
        public Version ProtocolVersion {
            get { 
                CheckDisposed();
                return m_IsVersionHttp11 ? HttpVersion.Version11 : HttpVersion.Version10;
            }
        } 

 
        internal bool KeepAlive { 
            get {
                // 
                // QFE  - DevDiv bug: 37757
                // If there is proxy involved, independen of the Http Version, we should honor the
                // proxy indicated Proxy-Connection header value.
                // This header value is not RFC mandated, but is a legacy from Netscape documentations. 
                // It indicates that the proxy wants to keep the connection.
                // Functionally it is equivalent of a Keep-Alive AND/OR Connection header. 
                // 
                // The absence of this check will result in HTTP/1.0 responsen be considered to be not
                // Keeping the connection alive. 
                //
                // This will result in a state mismatch between the connection pool and HttpWebRequest object
                // when the decision to drain the connection and putting it back to the idle pool is made.
                // 
                if (m_UsesProxySemantics)
                { 
                    string connectionHeader = Headers[HttpKnownHeaderNames.ProxyConnection]; 
                    if (connectionHeader != null)
                    { 
                        return connectionHeader.ToLower(CultureInfo.InvariantCulture).IndexOf("close") < 0 ||
                               connectionHeader.ToLower(CultureInfo.InvariantCulture).IndexOf("keep-alive") >= 0;
                    }
                } 

                if (ProtocolVersion==HttpVersion.Version10) { 
                    string keepAliveHeader = Headers[HttpKnownHeaderNames.KeepAlive]; 
                    return keepAliveHeader!=null;
                } 
                if (ProtocolVersion>=HttpVersion.Version11) {
                    string connectionHeader;
                    connectionHeader = Headers[HttpKnownHeaderNames.Connection];
                    return connectionHeader==null || connectionHeader.ToLower(CultureInfo.InvariantCulture).IndexOf("close")<0 || connectionHeader.ToLower(CultureInfo.InvariantCulture).IndexOf("keep-alive")>=0; 
                }
                return false; 
            } 
        }
 

        /*++

            ResponseStream - Return the response stream. 

            This property returns the response stream for this response. The 
            response stream will do de-chunking, etc. as needed. 

            Input: Nothing. Property is readonly. 

            Returns: Response stream for response.

        --*/ 

 
        ///  
        ///    Gets the stream used for reading the body of the response from the
        ///       server. 
        /// 
        public override Stream GetResponseStream() {
            if(Logging.On)Logging.Enter(Logging.Web, this, "GetResponseStream", "");
            CheckDisposed(); 

            if (!CanGetResponseStream()) 
            { 
                // give a blank stream in the HEAD case, which = 0 bytes of data
                if(Logging.On)Logging.Exit(Logging.Web, this, "GetResponseStream", Stream.Null); 
                return Stream.Null;
            }
            if(Logging.On)Logging.PrintInfo(Logging.Web, "ContentLength="+m_ContentLength);
            if(Logging.On)Logging.Exit(Logging.Web, this, "GetResponseStream", m_ConnectStream); 
            return m_ConnectStream;
        } 
 
        /*++
 
            Close - Closes the Response after the use.

            This causes the read stream to be closed.
 
        --*/
 
        public override void Close() { 
            if(Logging.On)Logging.Enter(Logging.Web, this, "Close", "");
            if (!m_disposed) 
            {
                m_disposed = true;
                Stream stream = m_ConnectStream;
                ICloseEx icloseEx = stream as ICloseEx; 
                if (icloseEx != null)
                { 
                    icloseEx.CloseEx(CloseExState.Normal /* | CloseExState.Silent */); 
                }
                else if (stream != null) 
                {
                    stream.Close();
                }
            } 
            if(Logging.On)Logging.Exit(Logging.Web, this, "Close", "");
        } 
 
        internal void Abort() {
            Stream stream = m_ConnectStream; 
            ICloseEx icloseEx = stream as ICloseEx;
            try
            {
                if (icloseEx != null) { 
                    icloseEx.CloseEx(CloseExState.Abort);
                } 
                else if (stream != null) { 
                    stream.Close();
                } 
            }
            catch { }
        }
 
        // for backward compat
        internal override void OnDispose(){ 
            m_propertiesDisposed = true; 
        }
 
        // true if we success a call to get ResponseStream, note this code
        // is duplicated and should use code out of the HttpWebRequest
        internal bool CanGetResponseStream() {
            return !m_Verb.ExpectNoContentResponse; 

        } 
 

        internal HttpWebResponse(Uri responseUri, KnownHttpVerb verb, CoreResponseData coreData, string mediaType, bool usesProxySemantics, DecompressionMethods decompressionMethod) { 
            m_Uri                       = responseUri;
            m_Verb                      = verb;
            m_MediaType                 = mediaType;
            m_UsesProxySemantics        = usesProxySemantics; 

            m_ConnectStream             = coreData.m_ConnectStream; 
            m_HttpResponseHeaders       = coreData.m_ResponseHeaders; 
            m_ContentLength             = coreData.m_ContentLength;
            m_StatusCode                = coreData.m_StatusCode; 
            m_StatusDescription         = coreData.m_StatusDescription;
            m_IsVersionHttp11           = coreData.m_IsVersionHttp11;

 
            //if the returned contentlength is zero, preemptively invoke calldone on the stream.
            //this will wake up any pending reads. 
            if (m_ContentLength == 0 && m_ConnectStream is ConnectStream) { 
                ((ConnectStream)m_ConnectStream).CallDone();
            } 

            // handle Content-Location header, by combining it with the orginal request.
            string contentLocation = m_HttpResponseHeaders[HttpKnownHeaderNames.ContentLocation];
 
            if (contentLocation != null) {
                try { 
                    m_Uri = new Uri(m_Uri, contentLocation); 
                } catch (UriFormatException e) {
                    GlobalLog.Assert("Exception on response Uri parsing.", e.ToString()); 
                }
            }
            // decompress responses by hooking up a final response Stream - only if user required it
            if(decompressionMethod != DecompressionMethods.None) { 
                string contentEncoding = m_HttpResponseHeaders[HttpKnownHeaderNames.ContentEncoding];
                if (contentEncoding != null){ 
                    if(((decompressionMethod & DecompressionMethods.GZip) != 0) && contentEncoding.IndexOf(HttpWebRequest.GZipHeader) != -1) { 
                        m_ConnectStream = new GZipWrapperStream(m_ConnectStream, CompressionMode.Decompress);
                        m_ContentLength = -1; // unknown on compressed streams 

                        // Setting a response header after parsing will ruin the Common Header optimization.
                        // This seems like a corner case.  ContentEncoding could be added as a common header, with a special
                        // property allowing it to be nulled. 
                        m_HttpResponseHeaders[HttpKnownHeaderNames.ContentEncoding] = null;
                    } 
                    else if (((decompressionMethod & DecompressionMethods.Deflate) != 0) && contentEncoding.IndexOf(HttpWebRequest.DeflateHeader) != -1) { 
                        m_ConnectStream = new DeflateWrapperStream(m_ConnectStream, CompressionMode.Decompress);
                        m_ContentLength = -1; // unknown on compressed streams 

                        // Setting a response header after parsing will ruin the Common Header optimization.
                        // This seems like a corner case.  ContentEncoding could be added as a common header, with a special
                        // property allowing it to be nulled. 
                        m_HttpResponseHeaders[HttpKnownHeaderNames.ContentEncoding] = null;
                    } 
                } 
            }
        } 

        //
        // ISerializable constructor
        // 
        /// 
        ///    [To be supplied.] 
        ///  

        [Obsolete("Serialization is obsoleted for this type.  http://go.microsoft.com/fwlink/?linkid=14202")] 
        protected HttpWebResponse(SerializationInfo serializationInfo, StreamingContext streamingContext):base(serializationInfo, streamingContext) {
            m_HttpResponseHeaders   = (WebHeaderCollection)serializationInfo.GetValue("m_HttpResponseHeaders", typeof(WebHeaderCollection));
            m_Uri                   = (Uri)serializationInfo.GetValue("m_Uri", typeof(Uri));
#if !FEATURE_PAL 
            m_Certificate           = (X509Certificate)serializationInfo.GetValue("m_Certificate", typeof(X509Certificate));
#endif // !FEATURE_PAL 
            Version version         = (Version)serializationInfo.GetValue("m_Version", typeof(Version)); 
            m_IsVersionHttp11       = version.Equals(HttpVersion.Version11);
            m_StatusCode            = (HttpStatusCode)serializationInfo.GetInt32("m_StatusCode"); 
            m_ContentLength         = serializationInfo.GetInt64("m_ContentLength");
            m_Verb                  = KnownHttpVerb.Parse(serializationInfo.GetString("m_Verb"));
            m_StatusDescription     = serializationInfo.GetString("m_StatusDescription");
            m_MediaType             = serializationInfo.GetString("m_MediaType"); 
        }
 
        // 
        // ISerializable method
        // 
        /// 
        [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter, SerializationFormatter=true)]
        void ISerializable.GetObjectData(SerializationInfo serializationInfo, StreamingContext streamingContext)
        { 
            GetObjectData(serializationInfo, streamingContext);
        } 
 
        //
        // FxCop: provide a way for derived classes to access this method even if they reimplement ISerializable. 
        //

        [SecurityPermission(SecurityAction.Demand, SerializationFormatter=true)]
        protected override void GetObjectData(SerializationInfo serializationInfo, StreamingContext streamingContext) 
        {
            // 
            // for now disregard streamingContext. 
            // just Add all the members we need to deserialize to construct
            // the object at deserialization time 
            //
            // the following runtime types already support serialization:
            // Boolean, Char, SByte, Byte, Int16, UInt16, Int32, UInt32, Int64, UInt64, Single, Double, DateTime
            // for the others we need to provide our own serialization 
            //
            serializationInfo.AddValue("m_HttpResponseHeaders", m_HttpResponseHeaders, typeof(WebHeaderCollection)); 
            serializationInfo.AddValue("m_Uri", m_Uri, typeof(Uri)); 
#if !FEATURE_PAL
            serializationInfo.AddValue("m_Certificate", m_Certificate, typeof(X509Certificate)); 
#endif // !FEATURE_PAL
            serializationInfo.AddValue("m_Version", ProtocolVersion, typeof(Version));
            serializationInfo.AddValue("m_StatusCode", m_StatusCode);
            serializationInfo.AddValue("m_ContentLength", m_ContentLength); 
            serializationInfo.AddValue("m_Verb", m_Verb.Name);
            serializationInfo.AddValue("m_StatusDescription", m_StatusDescription); 
            serializationInfo.AddValue("m_MediaType", m_MediaType); 
            base.GetObjectData(serializationInfo, streamingContext);
        } 

        /*++

        Routine Description: 

            Gets response headers from parsed server response 
 
        Arguments:
 
            headerName - HTTP header to search for matching header on.

        Return Value:
 
            string - contains the matched entry, if found
 
        --*/ 
        /// 
        ///     
        ///       Gets a specified header value returned with the response.
        ///    
        /// 
        public string GetResponseHeader( string headerName ) { 
            CheckDisposed();
 
            string headerValue = m_HttpResponseHeaders[headerName]; 

            return ( (headerValue==null) ? String.Empty : headerValue ); 
        }

#if HTTP_HEADER_EXTENSIONS_SUPPORTED
        // searches for extension header in response 
        /// 
        ///    [To be supplied.] 
        ///  
        public string GetExtension(HttpExtension extension, string header) {
            CheckDisposed(); 
            return GetResponseHeader(header);
        }
#endif
 
        /*++
 
            ResponseUri  - Gets the final Response Uri, that includes any 
             changes that may have transpired from the orginal Request
 
            This property returns Uri for this WebResponse.

            Input: Nothing.
 
            Returns: Response Uri for response.
 
                    read-only 

        --*/ 

        /// 
        ///    
        ///       Gets the Uniform Resource Indentifier (Uri) of the resource that returned the 
        ///       response.
        ///     
        ///  
        public override Uri ResponseUri {                               // read-only
            get { 
                CheckDisposed();
                return m_Uri;
            }
        } 

        /* 
            Accessor:   Method 

            Gets/Sets the http method of this request. 
            This method represents the Verb,
            after any redirects

            Returns: Method currently being used. 

 
        */ 
        /// 
        ///     
        ///       Gets the value of the method used to return the response.
        ///    
        /// 
        public string Method { 
            get {
                CheckDisposed(); 
                return m_Verb.Name; 
            }
        } 

        private void CheckDisposed() {
            if (m_propertiesDisposed) {
                throw new ObjectDisposedException(this.GetType().FullName); 
            }
        } 
 
    } // class HttpWebResponse
 
    // transfer ICloseEx behavior to nested compound stream.
    internal class GZipWrapperStream : GZipStream, ICloseEx {

        public GZipWrapperStream(Stream stream, CompressionMode mode) : base( stream, mode, false) { 
        }
 
        void ICloseEx.CloseEx(CloseExState closeState) { 
            ICloseEx icloseEx = BaseStream as ICloseEx;
            if (icloseEx != null) { 
                // since the internal Close() of GZipStream just does Close on our base stream
                // we don't have to call it anymore at this point
                icloseEx.CloseEx(closeState);
            } 
            else {
                Close(); 
            } 
        }
 


        public override IAsyncResult BeginRead(byte[] buffer, int offset, int size, AsyncCallback callback, Object state) {
 
            if (buffer==null) {
                throw new ArgumentNullException("buffer"); 
            } 
            if (offset<0 || offset>buffer.Length) {
                throw new ArgumentOutOfRangeException("offset"); 
            }
            if (size<0 || size>buffer.Length-offset) {
                throw new ArgumentOutOfRangeException("size");
            } 

            try{ 
                return base.BeginRead(buffer, offset, size, callback, state); 
            }
            catch(Exception e){ 
                try{
                    if (NclUtilities.IsFatal(e)) throw;
                    if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){
                        Close(); 
                    }
                } 
                catch{ 
                }
                throw e; 
            }
        }

        public override int EndRead(IAsyncResult asyncResult) { 

            if (asyncResult==null) { 
                throw new ArgumentNullException("asyncResult"); 
            }
 
            try{
                return base.EndRead(asyncResult);
            }
            catch(Exception e){ 
                try{
                    if (NclUtilities.IsFatal(e)) throw; 
                    if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){ 
                        Close();
                    } 
                }
                catch{
                }
                throw e; 
            }
        } 
 
        public override int Read(byte[] buffer, int offset, int size) {
 
            if (buffer==null) {
                throw new ArgumentNullException("buffer");
            }
            if (offset<0 || offset>buffer.Length) { 
                throw new ArgumentOutOfRangeException("offset");
            } 
            if (size<0 || size>buffer.Length-offset) { 
                throw new ArgumentOutOfRangeException("size");
            } 

            try{
                return base.Read(buffer, offset, size);
            } 
            catch(Exception e){
                try{ 
                    if (NclUtilities.IsFatal(e)) throw; 

                    if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){ 
                        Close();
                    }
                }
                catch{ 
                }
                throw e; 
            } 
        }
    } 


    internal class DeflateWrapperStream : DeflateStream, ICloseEx {
 
        public DeflateWrapperStream(Stream stream, CompressionMode mode) : base( stream, mode, false) {
        } 
 
        void ICloseEx.CloseEx(CloseExState closeState) {
            ICloseEx icloseEx = BaseStream as ICloseEx; 
            if (icloseEx != null) {
                // since the internal Close() of GZipStream just does Close on our base stream
                // we don't have to call it anymore at this point
                icloseEx.CloseEx(closeState); 
            }
            else { 
                Close(); 
            }
        } 


        public override IAsyncResult BeginRead(byte[] buffer, int offset, int size, AsyncCallback callback, Object state) {
 
            if (buffer==null) {
                throw new ArgumentNullException("buffer"); 
            } 
            if (offset<0 || offset>buffer.Length) {
                throw new ArgumentOutOfRangeException("offset"); 
            }
            if (size<0 || size>buffer.Length-offset) {
                throw new ArgumentOutOfRangeException("size");
            } 

            try{ 
                return base.BeginRead(buffer, offset, size, callback, state); 
            }
            catch(Exception e){ 
                try{
                    if (NclUtilities.IsFatal(e)) throw;
                    if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){
                        Close(); 
                    }
                } 
                catch{ 
                }
                throw e; 
            }
        }

        public override int EndRead(IAsyncResult asyncResult) { 

            if (asyncResult==null) { 
                throw new ArgumentNullException("asyncResult"); 
            }
 
            try{
                return base.EndRead(asyncResult);
            }
            catch(Exception e){ 
                try{
                    if (NclUtilities.IsFatal(e)) throw; 
                    if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){ 
                        Close();
                    } 
                }
                catch{
                }
                throw e; 
            }
        } 
 
        public override int Read(byte[] buffer, int offset, int size) {
 
            if (buffer==null) {
                throw new ArgumentNullException("buffer");
            }
            if (offset<0 || offset>buffer.Length) { 
                throw new ArgumentOutOfRangeException("offset");
            } 
            if (size<0 || size>buffer.Length-offset) { 
                throw new ArgumentOutOfRangeException("size");
            } 

            try{
                return base.Read(buffer, offset, size);
            } 
            catch(Exception e){
                try{ 
                    if (NclUtilities.IsFatal(e)) throw; 
                    if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){
                        Close(); 
                    }
                }
                catch{
                } 
                throw e;
            } 
        } 
    }
 


} // namespace System.Net

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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