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//
// System.Text.CodePageEncoding.cs
//
// Author:
// Kornél Pál <http://www.kornelpal.hu/>
//
// Copyright (C) 2006 Kornél Pál
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//
// These proxy classes implement IObjectReference.GetRealObject() that returns
// an instance of the appropriate Encoding, Encoder or Decoder class.
// As a result serialized objects of these types will transparently be
// deserialized to instances of the above described classes.
//
// Use SerializationInfo.SetType() in ISerializable.GetObjectData() method of
// serializable classes to serialize their instances using a proxy class.
//
// All of these proxy classes are non-public thus they only have to be
// serialization compatible with .NET Framework.
//
//
// .NET Framework 1.x uses this class for internal encodings and
// .NET Framework 2.0 serializes internal encodings using a proxy.
// This class supports serialization compatibility.
//
using System;
using System.Runtime.Serialization;
namespace System.Text
{
[Serializable]
internal sealed class CodePageEncoding : ISerializable, IObjectReference
{
//
// .NET Framework 1.x uses this class for internal decoders and
// .NET Framework 2.0 can deserialize them using a proxy.
// This class supports serialization compatibility.
//
[Serializable]
private sealed class Decoder : ISerializable, IObjectReference
{
private Encoding encoding;
private System.Text.Decoder realObject;
private Decoder (SerializationInfo info, StreamingContext context)
{
if (info == null)
throw new ArgumentNullException ("info");
this.encoding = (Encoding) info.GetValue ("encoding", typeof (Encoding));
}
public void GetObjectData (SerializationInfo info, StreamingContext context)
{
throw new ArgumentException ("This class cannot be serialized.");
}
public object GetRealObject (StreamingContext context)
{
if (this.realObject == null)
this.realObject = this.encoding.GetDecoder ();
return this.realObject;
}
}
private int codePage;
#if NET_2_0
private bool isReadOnly;
private EncoderFallback encoderFallback;
private DecoderFallback decoderFallback;
#endif
private Encoding realObject;
private CodePageEncoding (SerializationInfo info, StreamingContext context)
{
if (info == null)
throw new ArgumentNullException ("info");
this.codePage = (int) info.GetValue ("m_codePage", typeof (int));
#if NET_2_0
try {
this.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) {
// .NET Framework 1.x has no fallbacks
this.isReadOnly = true;
}
#endif
}
public void GetObjectData (SerializationInfo info, StreamingContext context)
{
throw new ArgumentException ("This class cannot be serialized.");
}
public object GetRealObject (StreamingContext context)
{
if (this.realObject == null) {
Encoding encoding = Encoding.GetEncoding (this.codePage);
#if NET_2_0
if (!this.isReadOnly) {
encoding = (Encoding) encoding.Clone ();
encoding.EncoderFallback = this.encoderFallback;
encoding.DecoderFallback = this.decoderFallback;
}
#endif
this.realObject = encoding;
}
return this.realObject;
}
}
}
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