MLangCodePageEncoding.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 / MLangCodePageEncoding.cs / 1 / MLangCodePageEncoding.cs
                        

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

// WARNING: 
// 
// This is just an IObjectReference proxy for the former MLang Encodings (V1.1)
// We keep the old name now even for the Whidbey V2.0 IObjectReference because it also 
// works with the Everett V1.1 version.
namespace System.Text
{
    using System; 
    using System.Runtime.Serialization;
    using System.Security.Permissions; 
 
    /*=================================MLangCodePageEncoding==================================
    ** This class is here only to deserialize the MLang 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 MLangCodePageEncoding : 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 MLangCodePageEncoding(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 MLangCodePageEncoding ISerializable.GetObjectData"); 
            throw new ArgumentException(Environment.GetResourceString("Arg_ExecutionEngineException"));        }

        // Same problem with the Encoder, this only happens with Everett Encoders
        [Serializable] 
        internal sealed class MLangEncoder : ISerializable, IObjectReference
        { 
            // Might need this when GetRealObjecting 
            [NonSerialized]
            private Encoding realEncoding = null; 

            // Constructor called by serialization, have to handle deserializing from Everett
            internal MLangEncoder(SerializationInfo info, StreamingContext context)
            { 
                // Any info?
                if (info==null) throw new ArgumentNullException("info"); 
 
                this.realEncoding = (Encoding)info.GetValue("m_encoding", typeof(Encoding));
            } 

            // Just get it from GetEncoder
            public Object GetRealObject(StreamingContext context)
            { 
                return this.realEncoding.GetEncoder();
            } 
 
            // 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 MLangCodePageEncoding.MLangEncoder.GetObjectData"); 
                throw new ArgumentException(Environment.GetResourceString("Arg_ExecutionEngineException"));
            } 
        } 

 
        // Same problem with the Decoder, this only happens with Everett Decoders
        [Serializable]
        internal sealed class MLangDecoder : ISerializable, IObjectReference
        { 
            // Might need this when GetRealObjecting
            [NonSerialized] 
            private Encoding realEncoding = null; 

            // Constructor called by serialization, have to handle deserializing from Everett 
            internal MLangDecoder(SerializationInfo info, StreamingContext context)
            {
                // Any info?
                if (info==null) throw new ArgumentNullException("info"); 

                this.realEncoding = (Encoding)info.GetValue("m_encoding", typeof(Encoding)); 
            } 

            // Just get it from GetDecoder 
            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 MLangCodePageEncoding.MLangDecoder.GetObjectData");
                throw new ArgumentException(Environment.GetResourceString("Arg_ExecutionEngineException"));
            } 
        }
    } 
}

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