HttpResponseHeader.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / fx / src / xsp / System / Web / HttpResponseHeader.cs / 3 / HttpResponseHeader.cs
                        

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

/* 
 * Single http header representation 
 *
 * Copyright (c) 1998 Microsoft Corporation 
 */

namespace System.Web {
 
    using System.Collections;
    using System.Text; 
 
    /*
     * Response header (either known or unknown) 
     */
    internal class HttpResponseHeader {
        private String _unknownHeader;
        private int _knownHeaderIndex; 
        private String _value;
 
        private static readonly string[] EncodingTable = new string[] {     "%00", "%01", "%02", "%03", "%04", 
                                                                            "%05", "%06", "%07", "%08", "%09",
                                                                            "%0a", "%0b", "%0c", "%0d", "%0e", 
                                                                            "%0f", "%10", "%11", "%12", "%13",
                                                                            "%14", "%15", "%16", "%17", "%18",
                                                                            "%19", "%1a", "%1b", "%1c", "%1d",
                                                                            "%1e", "%1f" }; 

 
        internal HttpResponseHeader(int knownHeaderIndex, String value) { 
            _unknownHeader = null;
            _knownHeaderIndex = knownHeaderIndex; 

            // encode header value if
            if(HttpRuntime.EnableHeaderChecking) {
                _value = MaybeEncodeHeader(value); 
            }
            else { 
                _value = value; 
            }
        } 

        internal HttpResponseHeader(String unknownHeader, String value) {
            if(HttpRuntime.EnableHeaderChecking) {
                _unknownHeader = MaybeEncodeHeader(unknownHeader); 
                _knownHeaderIndex = HttpWorkerRequest.GetKnownResponseHeaderIndex(_unknownHeader);
                _value = MaybeEncodeHeader(value); 
            } 
            else {
                _unknownHeader = unknownHeader; 
                _knownHeaderIndex = HttpWorkerRequest.GetKnownResponseHeaderIndex(_unknownHeader);
                _value = value;
            }
        } 

        internal virtual String Name { 
            get { 
                if (_unknownHeader != null)
                    return _unknownHeader; 
                else
                    return HttpWorkerRequest.GetKnownResponseHeaderName(_knownHeaderIndex);
            }
        } 

        internal String Value { 
            get { return _value;} 
        }
 
        internal void Send(HttpWorkerRequest wr) {
            if (_knownHeaderIndex >= 0)
                wr.SendKnownResponseHeader(_knownHeaderIndex, _value);
            else 
                wr.SendUnknownResponseHeader(_unknownHeader, _value);
        } 
 
        // Encode the header if it contains a CRLF pair
        // 
        internal static string MaybeEncodeHeader(string value) {
            string sanitizedHeader = value;
            if (NeedsEncoding(value)) {
                // DevDiv Bugs 146028 
                // Denial Of Service scenarios involving
                // control characters are possible. 
                // We are encoding the following characters: 
                // - All CTL characters except HT (horizontal tab)
                // - DEL character (\x7f) 
                StringBuilder sb = new StringBuilder();
                foreach (char c in value) {
                    if (c < 32 && c != 9) {
                        sb.Append(EncodingTable[c]); 
                    }
                    else if (c == 127) { 
                        sb.Append("%7f"); 
                    }
                    else { 
                        sb.Append(c);
                    }
                }
                sanitizedHeader = sb.ToString(); 
            }
 
            return sanitizedHeader; 
        }
 
        // Returns true if the string contains a control character (other than horizontal tab) or the DEL character.
        internal static bool NeedsEncoding(string value) {
            foreach (char c in value) {
                if ((c < 32 && c != 9) || (c == 127)) { 
                    return true;
                } 
            } 
            return false;
        } 
    }
}

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

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