2 // System.Text.MLangCodePageEncoding.cs
5 // Kornél Pál <http://www.kornelpal.hu/>
7 // Copyright (C) 2006 Kornél Pál
11 // Permission is hereby granted, free of charge, to any person obtaining
12 // a copy of this software and associated documentation files (the
13 // "Software"), to deal in the Software without restriction, including
14 // without limitation the rights to use, copy, modify, merge, publish,
15 // distribute, sublicense, and/or sell copies of the Software, and to
16 // permit persons to whom the Software is furnished to do so, subject to
17 // the following conditions:
19 // The above copyright notice and this permission notice shall be
20 // included in all copies or substantial portions of the Software.
22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
32 // These proxy classes implement IObjectReference.GetRealObject() that returns
33 // an instance of the appropriate Encoding, Encoder or Decoder class.
34 // As a result serialized objects of these types will transparently be
35 // deserialized to instances of the above described classes.
37 // Use SerializationInfo.SetType() in ISerializable.GetObjectData() method of
38 // serializable classes to serialize their instances using a proxy class.
40 // All of these proxy classes are non-public thus they only have to be
41 // serialization compatible with .NET Framework.
45 // .NET Framework 1.x uses this class for internal encodings and
46 // .NET Framework 2.0 serializes internal encodings using a proxy.
47 // This class supports serialization compatibility.
51 using System.Runtime.Serialization;
56 internal sealed class MLangCodePageEncoding : ISerializable, IObjectReference
59 // .NET Framework 1.x uses this class for internal encoders.
60 // .NET Framework 2.0 can deserialize them using a proxy although
61 // this class is not serializable in .NET Framework 1.x.
62 // This class supports serialization compatibility.
66 private sealed class MLangEncoder : ISerializable, IObjectReference
68 private Encoding encoding;
69 private Encoder realObject;
71 private MLangEncoder (SerializationInfo info, StreamingContext context)
74 throw new ArgumentNullException ("info");
76 this.encoding = (Encoding) info.GetValue ("m_encoding", typeof (Encoding));
79 public void GetObjectData (SerializationInfo info, StreamingContext context)
81 throw new ArgumentException ("This class cannot be serialized.");
84 public object GetRealObject (StreamingContext context)
86 if (this.realObject == null)
87 this.realObject = this.encoding.GetEncoder ();
89 return this.realObject;
94 // .NET Framework 1.x uses this class for internal decoders.
95 // .NET Framework 2.0 can deserialize them using a proxy although
96 // this class is not serializable in .NET Framework 1.x.
97 // This class supports serialization compatibility.
101 private sealed class MLangDecoder : ISerializable, IObjectReference
103 private Encoding encoding;
104 private Decoder realObject;
106 private MLangDecoder (SerializationInfo info, StreamingContext context)
109 throw new ArgumentNullException ("info");
111 this.encoding = (Encoding) info.GetValue ("m_encoding", typeof (Encoding));
114 public void GetObjectData (SerializationInfo info, StreamingContext context)
116 throw new ArgumentException ("This class cannot be serialized.");
119 public object GetRealObject (StreamingContext context)
121 if (this.realObject == null)
122 this.realObject = this.encoding.GetDecoder ();
124 return this.realObject;
128 private int codePage;
129 private bool isReadOnly;
130 private EncoderFallback encoderFallback;
131 private DecoderFallback decoderFallback;
132 private Encoding realObject;
134 private MLangCodePageEncoding (SerializationInfo info, StreamingContext context)
137 throw new ArgumentNullException ("info");
139 this.codePage = (int) info.GetValue ("m_codePage", typeof (int));
142 this.isReadOnly = (bool) info.GetValue ("m_isReadOnly", typeof (bool));
143 this.encoderFallback = (EncoderFallback) info.GetValue ("encoderFallback", typeof (EncoderFallback));
144 this.decoderFallback = (DecoderFallback) info.GetValue ("decoderFallback", typeof (DecoderFallback));
145 } catch (SerializationException) {
146 // .NET Framework 1.x has no fallbacks
147 this.isReadOnly = true;
151 public void GetObjectData (SerializationInfo info, StreamingContext context)
153 throw new ArgumentException ("This class cannot be serialized.");
156 public object GetRealObject (StreamingContext context)
158 if (this.realObject == null) {
159 Encoding encoding = Encoding.GetEncoding (this.codePage);
161 if (!this.isReadOnly) {
162 encoding = (Encoding) encoding.Clone ();
163 encoding.EncoderFallback = this.encoderFallback;
164 encoding.DecoderFallback = this.decoderFallback;
166 this.realObject = encoding;
169 return this.realObject;