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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
namespace System.Text
{
using System;
using System.Diagnostics.Contracts;
using System.Collections;
using System.Runtime.Remoting;
using System.Globalization;
using System.Threading;
using Win32Native = Microsoft.Win32.Win32Native;
// This class overrides Encoding with the things we need for our NLS Encodings
[System.Runtime.InteropServices.ComVisible(true)]
[Serializable]
internal abstract class EncodingNLS : Encoding
{
protected EncodingNLS(int codePage) : base(codePage)
{
}
// NOTE: Many methods in this class forward to EncodingForwarder for
// validating arguments/wrapping the unsafe methods in this class
// which do the actual work. That class contains
// shared logic for doing this which is used by
// ASCIIEncoding, EncodingNLS, UnicodeEncoding, UTF32Encoding,
// UTF7Encoding, and UTF8Encoding.
// The reason the code is separated out into a static class, rather
// than a base class which overrides all of these methods for us
// (which is what EncodingNLS is for internal Encodings) is because
// that's really more of an implementation detail so it's internal.
// At the same time, C# doesn't allow a public class subclassing an
// internal/private one, so we end up having to re-override these
// methods in all of the public Encodings + EncodingNLS.
// Returns the number of bytes required to encode a range of characters in
// a character array.
public override int GetByteCount(char[] chars, int index, int count)
{
return EncodingForwarder.GetByteCount(this, chars, index, count);
}
public override int GetByteCount(String s)
{
return EncodingForwarder.GetByteCount(this, s);
}
public override unsafe int GetByteCount(char* chars, int count)
{
return EncodingForwarder.GetByteCount(this, chars, count);
}
public override int GetBytes(String s, int charIndex, int charCount,
byte[] bytes, int byteIndex)
{
return EncodingForwarder.GetBytes(this, s, charIndex, charCount, bytes, byteIndex);
}
// Encodes a range of characters in a character array into a range of bytes
// in a byte array. 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 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)
{
return EncodingForwarder.GetBytes(this, chars, charIndex, charCount, bytes, byteIndex);
}
public override unsafe int GetBytes(char* chars, int charCount, byte* bytes, int byteCount)
{
return EncodingForwarder.GetBytes(this, chars, charCount, bytes, byteCount);
}
// Returns the number of characters produced by decoding a range of bytes
// in a byte array.
public override int GetCharCount(byte[] bytes, int index, int count)
{
return EncodingForwarder.GetCharCount(this, bytes, index, count);
}
public override unsafe int GetCharCount(byte* bytes, int count)
{
return EncodingForwarder.GetCharCount(this, bytes, count);
}
public override int GetChars(byte[] bytes, int byteIndex, int byteCount,
char[] chars, int charIndex)
{
return EncodingForwarder.GetChars(this, bytes, byteIndex, byteCount, chars, charIndex);
}
public unsafe override int GetChars(byte* bytes, int byteCount, char* chars, int charCount)
{
return EncodingForwarder.GetChars(this, bytes, byteCount, chars, charCount);
}
// Returns a string containing the decoded representation of a range of
// bytes in a byte array.
public override String GetString(byte[] bytes, int index, int count)
{
return EncodingForwarder.GetString(this, bytes, index, count);
}
public override Decoder GetDecoder()
{
return new DecoderNLS(this);
}
public override Encoder GetEncoder()
{
return new EncoderNLS(this);
}
}
}
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