138 lines
4.4 KiB
C#
138 lines
4.4 KiB
C#
//
|
|
// 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;
|
|
private bool isReadOnly;
|
|
private EncoderFallback encoderFallback;
|
|
private DecoderFallback decoderFallback;
|
|
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));
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
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 (!this.isReadOnly) {
|
|
encoding = (Encoding) encoding.Clone ();
|
|
encoding.EncoderFallback = this.encoderFallback;
|
|
encoding.DecoderFallback = this.decoderFallback;
|
|
}
|
|
|
|
this.realObject = encoding;
|
|
}
|
|
|
|
return this.realObject;
|
|
}
|
|
}
|
|
}
|