CodePageEncoding.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Text / CodePageEncoding.cs / 1 / CodePageEncoding.cs
                        

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

// WARNING: 
// 
// This is just an IObjectReference proxy for the Code Page Encodings.
namespace System.Text 
{
    using System;
    using System.Runtime.Serialization;
    using System.Security.Permissions; 

    /*=================================CodePageEncoding================================== 
    ** This class is here only to deserialize the Code Page classes from Everett (V1.1) into 
    ** Appropriate Whidbey (V2.0) objects.  We also serialize the Whidbey classes
    ** using this proxy since we pretty much need one anyway and that solves Whidbey 
    ** to Everett compatibility as well.
    ==============================================================================*/

    [Serializable()] 
    internal sealed class CodePageEncoding : ISerializable, IObjectReference
    { 
        // Temp stuff 
        [NonSerialized]
        private int m_codePage; 
        [NonSerialized]
        private bool m_isReadOnly;
        [NonSerialized]
        private bool m_deserializedFromEverett = false; 

        [NonSerialized] 
        private EncoderFallback encoderFallback = null; 
        [NonSerialized]
        private DecoderFallback decoderFallback = null; 

        // Might need this when GetRealObjecting
        [NonSerialized]
        private Encoding realEncoding = null; 

        // Constructor called by serialization. 
        internal CodePageEncoding(SerializationInfo info, StreamingContext context) 
        {
            // Any info? 
            if (info==null) throw new ArgumentNullException("info");

            // All versions have a code page
            this.m_codePage = (int)info.GetValue("m_codePage", typeof(int)); 

            // See if we have a code page 
            try 
            {
                // 
                // Try Whidbey V2.0 Fields
                //
                this.m_isReadOnly = (bool)info.GetValue("m_isReadOnly", typeof(bool));
 
                this.encoderFallback = (EncoderFallback)info.GetValue("encoderFallback", typeof(EncoderFallback));
                this.decoderFallback = (DecoderFallback)info.GetValue("decoderFallback", typeof(DecoderFallback)); 
            } 
            catch (SerializationException)
            { 
                //
                // Didn't have Whidbey things, must be Everett
                //
                this.m_deserializedFromEverett = true; 

                // May as well be read only 
                this.m_isReadOnly = true; 
            }
        } 

        // Just get it from GetEncoding
        public Object GetRealObject(StreamingContext context)
        { 
            // Get our encoding (Note: This has default fallbacks for readonly and everett cases)
            this.realEncoding = Encoding.GetEncoding(this.m_codePage); 
 
            // If its read only then it uses default fallbacks, otherwise pick up the new ones
            // Otherwise we want to leave the new one read only 
            if (!this.m_deserializedFromEverett && !this.m_isReadOnly)
            {
                this.realEncoding = (Encoding)this.realEncoding.Clone();
                this.realEncoding.EncoderFallback = this.encoderFallback; 
                this.realEncoding.DecoderFallback = this.decoderFallback;
            } 
 
            return this.realEncoding;
        } 

        // ISerializable implementation
        [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)]
        void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) 
        {
            // We cannot ever call this. 
            BCLDebug.Assert(false, "Didn't expect to make it to CodePageEncoding ISerializable.GetObjectData"); 
            throw new ArgumentException(Environment.GetResourceString("Arg_ExecutionEngineException"));
        } 

        // Same problem with the Decoder, this only happens with Everett Decoders
        [Serializable]
        internal sealed class Decoder : ISerializable, IObjectReference 
        {
            // Might need this when GetRealObjecting 
            [NonSerialized] 
            private Encoding realEncoding = null;
 
            // Constructor called by serialization, have to handle deserializing from Everett
            internal Decoder(SerializationInfo info, StreamingContext context)
            {
                // Any info? 
                if (info==null) throw new ArgumentNullException("info");
 
                this.realEncoding = (Encoding)info.GetValue("encoding", typeof(Encoding)); 
            }
 
            // Just get it from GetDecider
            public Object GetRealObject(StreamingContext context)
            {
                return this.realEncoding.GetDecoder(); 
            }
 
            // ISerializable implementation, get data for this object 
            [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)]
            void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) 
            {
                // We cannot ever call this.
                BCLDebug.Assert(false, "Didn't expect to make it to CodePageEncoding.Decoder.GetObjectData");
                throw new ArgumentException(Environment.GetResourceString("Arg_ExecutionEngineException")); 
            }
        } 
    } 
}

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