Add missing new I18N DefaultEncoder class.

mcs/class/I18N/Common/DefaultEncoder.cs

@@ -0,0 +1,148 @@
+// This is partially copied source from referencesource/mscorlib/system/text/encoding.cs, modifying a bit.
+
+// ==++==
+//
+//   Copyright (c) Microsoft Corporation.  All rights reserved.
+//
+// ==--==
+
+
+using System;
+using System.Diagnostics.CodeAnalysis;
+using System.Diagnostics.Contracts;
+using System.Runtime.InteropServices;
+using System.Runtime.Serialization;
+using System.Text;
+
+namespace I18N.Common
+{
+        [Serializable]
+        public class ReferenceSourceDefaultEncoder : Encoder, IObjectReference
+        {
+            private Encoding m_encoding;
+            [NonSerialized] private bool m_hasInitializedEncoding;
+
+            [NonSerialized] internal char charLeftOver;
+
+            public ReferenceSourceDefaultEncoder(Encoding encoding)
+            {
+                m_encoding = encoding;
+                m_hasInitializedEncoding = true;
+            }
+
+            // Constructor called by serialization, have to handle deserializing from Everett
+            internal ReferenceSourceDefaultEncoder(SerializationInfo info, StreamingContext context)
+            {
+                if (info==null) throw new ArgumentNullException("info");
+                Contract.EndContractBlock();
+
+                // All we have is our encoding
+                this.m_encoding = (Encoding)info.GetValue("encoding", typeof(Encoding));
+
+                try 
+                {
+                    //this.m_fallback     = (EncoderFallback) info.GetValue("m_fallback",   typeof(EncoderFallback));
+                    this.charLeftOver   = (Char)            info.GetValue("charLeftOver", typeof(Char));
+                }
+                catch (SerializationException)
+                {
+                }
+            }
+
+            // Just get it from GetEncoding
+            [System.Security.SecurityCritical]  // auto-generated
+            public Object GetRealObject(StreamingContext context)
+            {
+                // upon deserialization since the DefaultEncoder implement IObjectReference the 
+                // serialization code tries to do the fixup. The fixup returns another 
+                // IObjectReference (the DefaultEncoder) class and hence so on and on. 
+                // Finally the deserialization logics fails after following maximum references
+                // unless we short circuit with the following
+                if (m_hasInitializedEncoding)
+                {
+                    return this;
+                }
+
+                Encoder encoder = m_encoding.GetEncoder();
+                /*
+                if (m_fallback != null)
+                    encoder.m_fallback = m_fallback;
+                if (charLeftOver != (char) 0)
+                {
+                    EncoderNLS encoderNls = encoder as EncoderNLS;
+                    if (encoderNls != null)
+                        encoderNls.charLeftOver = charLeftOver;
+                }
+                */
+                return encoder;
+            }
+
+#if FEATURE_SERIALIZATION
+            // ISerializable implementation, get data for this object
+            [System.Security.SecurityCritical]  // auto-generated_required
+            void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)
+            {
+                // Any info?
+                if (info==null) throw new ArgumentNullException("info");
+                Contract.EndContractBlock();
+
+                // All we have is our encoding
+                info.AddValue("encoding", this.m_encoding);
+            }
+#endif
+
+            // Returns the number of bytes the next call to GetBytes will
+            // produce if presented with the given range of characters and the given
+            // value of the flush parameter. The returned value takes into
+            // account the state in which the encoder was left following the last call
+            // to GetBytes. The state of the encoder is not affected by a call
+            // to this method.
+            //
+
+            public override int GetByteCount(char[] chars, int index, int count, bool flush)
+            {
+                return m_encoding.GetByteCount(chars, index, count);
+            }
+
+            [System.Security.SecurityCritical]  // auto-generated
+            [SuppressMessage("Microsoft.Contracts", "CC1055")]  // Skip extra error checking to avoid *potential* AppCompat problems.
+            public unsafe override int GetByteCount(char* chars, int count, bool flush)
+            {
+                return m_encoding.GetByteCount(chars, count);
+            }
+
+            // Encodes a range of characters in a character array into a range of bytes
+            // in a byte array. The method encodes charCount characters from
+            // chars starting at index charIndex, storing the resulting
+            // bytes in bytes starting at index byteIndex. The encoding
+            // takes into account the state in which the encoder was left following the
+            // last call to this method. The flush parameter indicates whether
+            // the encoder should flush any shift-states and partial characters at the
+            // end of the conversion. To ensure correct termination of a sequence of
+            // blocks of encoded bytes, the last call to GetBytes should specify
+            // a value of true for the flush parameter.
+            //
+            // An exception occurs if the byte array is not large enough to hold the
+            // complete encoding of the characters. The GetByteCount method can
+            // be used to determine the exact number of bytes that will be produced for
+            // a given range of characters. Alternatively, the GetMaxByteCount
+            // method of the Encoding that produced this encoder can be used to
+            // determine the maximum number of bytes that will be produced for a given
+            // number of characters, regardless of the actual character values.
+            //
+
+            public override int GetBytes(char[] chars, int charIndex, int charCount,
+                                          byte[] bytes, int byteIndex, bool flush)
+            {
+                return m_encoding.GetBytes(chars, charIndex, charCount, bytes, byteIndex);
+            }
+
+            [System.Security.SecurityCritical]  // auto-generated
+            [SuppressMessage("Microsoft.Contracts", "CC1055")]  // Skip extra error checking to avoid *potential* AppCompat problems.
+            public unsafe override int GetBytes(char* chars, int charCount,
+                                                 byte* bytes, int byteCount, bool flush)
+            {
+                return m_encoding.GetBytes(chars, charCount, bytes, byteCount);
+            }
+        }
+}