/*
 * CP51932.cs - Japanese EUC-JP code page.
 *
 * It is based on CP932.cs from Portable.NET
 *
 * Author:
 *	Atsushi Enomoto <atsushi@ximian.com>
 *
 * Below are original (CP932.cs) copyright lines
 *
 * (C)2004 Novell Inc.
 *
 * Copyright (c) 2002  Southern Storm Software, Pty Ltd
 *
 * 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.
 */
/*
	Well, there looks no jis.table source. Thus, it seems like it is 
	generated from text files from Unicode Home Page such like
	ftp://ftp.unicode.org/Public/MAPPINGS/OBSOLETE/EASTASIA/JIS/JIS0208.TXT
	However, it is non-normative and in Japan it is contains many problem.
	FIXME:  Some characters such as 0xFF0B (wide "plus") are missing in
		that table.
*/
/*
	0x00-0x1F, 0x7F   : control characters
	0x20-0x7E         : ASCII
	0xA1A1-0xFEFE     : Kanji (precisely, both bytes contain only A1-FE)
	0x8EA1-0x8EDF     : half-width Katakana
	0x8FA1A1-0x8FFEFE : Complemental Kanji
*/
namespace I18N.CJK
{
using System;
using System.Text;
using I18N.Common;
#if DISABLE_UNSAFE
using MonoEncoder = I18N.Common.MonoSafeEncoder;
using MonoEncoding = I18N.Common.MonoSafeEncoding;
#endif
[Serializable]
public class CP51932 : MonoEncoding
{
	// Magic number used by Windows for the EUC-JP code page.
	private const int EUC_JP_CODE_PAGE = 51932;
	// Constructor.
	public CP51932 () : base (EUC_JP_CODE_PAGE, 932)
	{
	}
#if !DISABLE_UNSAFE
	public unsafe override int GetByteCountImpl (char* chars, int count)
	{
		return new CP51932Encoder (this).GetByteCountImpl (chars, count, true);
	}
	public unsafe override int GetBytesImpl (char* chars, int charCount, byte* bytes, int byteCount)
	{
		return new CP51932Encoder (this).GetBytesImpl (chars, charCount, bytes, byteCount, true);
	}
#else
	public override int GetByteCount (char [] chars, int index, int length)
	{
		return new CP51932Encoder (this).GetByteCount (chars, index, length, true);
	}
	public override int GetBytes(char[] chars, int charIndex, int charCount, byte[] bytes, int byteIndex)
	{
		return new CP51932Encoder (this).GetBytes (chars, charIndex, charCount, bytes, byteIndex, true);
	}
#endif
	public override int GetCharCount (byte [] bytes, int index, int count)
	{
		return new CP51932Decoder ().GetCharCount (
			bytes, index, count, true);
	}
	public override int GetChars (
		byte [] bytes, int byteIndex, int byteCount,
		char [] chars, int charIndex)
	{
		return new CP51932Decoder ().GetChars (bytes,
			byteIndex, byteCount, chars, charIndex, true);
	}
	// Get the maximum number of bytes needed to encode a
	// specified number of characters.
	public override int GetMaxByteCount(int charCount)
	{
		if(charCount < 0)
		{
			throw new ArgumentOutOfRangeException
				("charCount",
				 Strings.GetString("ArgRange_NonNegative"));
		}
		return charCount * 3;
	}
	// Get the maximum number of characters needed to decode a
	// specified number of bytes.
	public override int GetMaxCharCount(int byteCount)
	{
		if(byteCount < 0)
		{
			throw new ArgumentOutOfRangeException
				("byteCount",
				 Strings.GetString ("ArgRange_NonNegative"));
		}
		return byteCount;
	}
	public override Encoder GetEncoder ()
	{
		return new CP51932Encoder (this);
	}
	public override Decoder GetDecoder ()
	{
		return new CP51932Decoder ();
	}
#if !ECMA_COMPAT
	// Get the mail body name for this encoding.
	public override String BodyName {
		get { return "euc-jp"; }
	}
	// Get the human-readable name for this encoding.
	public override String EncodingName {
		get { return "Japanese (EUC)"; }
	}
	// Get the mail agent header name for this encoding.
	public override String HeaderName {
		get { return "euc-jp"; }
	}
	// Determine if this encoding can be displayed in a Web browser.
	public override bool IsBrowserDisplay {
		get { return true; }
	}
	// Determine if this encoding can be saved from a Web browser.
	public override bool IsBrowserSave {
		get { return true; }
	}
	// Determine if this encoding can be displayed in a mail/news agent.
	public override bool IsMailNewsDisplay {
		get { return true; }
	}
	// Determine if this encoding can be saved from a mail/news agent.
	public override bool IsMailNewsSave {
		get { return true; }
	}
	// Get the IANA-preferred Web name for this encoding.
	public override String WebName {
		get { return "euc-jp"; }
	}
} // CP51932
#endif // !ECMA_COMPAT
public class CP51932Encoder : MonoEncoder
{
	public CP51932Encoder (MonoEncoding encoding)
		: base (encoding)
	{
	}
#if !DISABLE_UNSAFE
	// Get the number of bytes needed to encode a character buffer.
	public unsafe override int GetByteCountImpl (
		char* chars, int count, bool refresh)
	{
		// Determine the length of the final output.
		int index = 0;
		int length = 0;
		int ch, value;
		byte [] cjkToJis = JISConvert.Convert.cjkToJis;
		byte [] extraToJis = JISConvert.Convert.extraToJis;
		while (count > 0) {
			ch = chars [index++];
			--count;
			++length;
			if (ch < 0x0080) {
				// Character maps to itself.
				continue;
			} else if (ch < 0x0100) {
				// Check for special Latin 1 characters that
				// can be mapped to double-byte code points.
				if(ch == 0x00A2 || ch == 0x00A3 || ch == 0x00A7 ||
				   ch == 0x00A8 || ch == 0x00AC || ch == 0x00B0 ||
				   ch == 0x00B1 || ch == 0x00B4 || ch == 0x00B6 ||
				   ch == 0x00D7 || ch == 0x00F7)
				{
					++length;
				}
			} else if (ch >= 0x0391 && ch <= 0x0451) {
				// Greek subset characters.
				++length;
			} else if (ch >= 0x2010 && ch <= 0x9FA5) {
				// This range contains the bulk of the CJK set.
				value = (ch - 0x2010) * 2;
				value = ((int) (cjkToJis[value])) | (((int)(cjkToJis[value + 1])) << 8);
				if(value >= 0x0100)
					++length;
			} else if(ch >= 0xFF01 && ch < 0xFF60) {
				// This range contains extra characters.
				value = (ch - 0xFF01) * 2;
				value = ((int)(extraToJis[value])) |
						(((int)(extraToJis[value + 1])) << 8);
				if(value >= 0x0100)
					++length;
			} else if(ch >= 0xFF60 && ch <= 0xFFA0) {
				++length; // half-width kana
			}
		}
		// Return the length to the caller.
		return length;
	}
	// Get the bytes that result from encoding a character buffer.
	public unsafe override int GetBytesImpl (
		char* chars, int charCount, byte* bytes, int byteCount, bool refresh)
	{
		int charIndex = 0;
		int byteIndex = 0;
		int end = charCount;
		// Convert the characters into their byte form.
		int posn = byteIndex;
		int byteLength = byteCount;
		int ch, value;
		byte[] cjkToJis = JISConvert.Convert.cjkToJis;
		byte[] greekToJis = JISConvert.Convert.greekToJis;
		byte[] extraToJis = JISConvert.Convert.extraToJis;
		for (int i = charIndex; i < end; i++, charCount--) {
			ch = chars [i];
			if (posn >= byteLength) {
				throw new ArgumentException (Strings.GetString ("Arg_InsufficientSpace"), "bytes");
			}
			if (ch < 0x0080) {
				// Character maps to itself.
				bytes[posn++] = (byte)ch;
				continue;
			} else if (ch >= 0x0391 && ch <= 0x0451) {
				// Greek subset characters.
				value = (ch - 0x0391) * 2;
				value = ((int)(greekToJis[value])) |
						(((int)(greekToJis[value + 1])) << 8);
			} else if (ch >= 0x2010 && ch <= 0x9FA5) {
				// This range contains the bulk of the CJK set.
				value = (ch - 0x2010) * 2;
				value = ((int) (cjkToJis[value])) |
						(((int)(cjkToJis[value + 1])) << 8);
			} else if (ch >= 0xFF01 && ch <= 0xFF60) {
				// This range contains extra characters,
				// including half-width katakana.
				value = (ch - 0xFF01) * 2;
				value = ((int) (extraToJis [value])) |
						(((int) (extraToJis [value + 1])) << 8);
			} else if (ch >= 0xFF60 && ch <= 0xFFA0) {


Answer: 				value = ch - 0xFF60 + 0x8EA0;