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	/*
	* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.nio.cs;

	import java.nio.ByteBuffer;
	import java.nio.CharBuffer;
	import java.nio.charset.Charset;
	import java.nio.charset.CharsetDecoder;
	import java.nio.charset.CharsetEncoder;
	import java.nio.charset.CoderResult;
	import java.util.Arrays;
	import sun.nio.cs.DoubleByte;
	import sun.nio.cs.Surrogate;
	import static sun.nio.cs.CharsetMapping.*;

	public class HKSCS {

	public static class Decoder extends DoubleByte.Decoder {
	static int b2Min = 0x40;
	static int b2Max = 0xfe;

	private char[][] b2cBmp;
	private char[][] b2cSupp;
	private DoubleByte.Decoder big5Dec;

	protected Decoder(Charset cs,
	DoubleByte.Decoder big5Dec,
	char[][] b2cBmp, char[][] b2cSupp)
	{
	// super(cs, 0.5f, 1.0f);
	// need to extends DoubleByte.Decoder so the
	// sun.io can use it. this implementation
	super(cs, 0.5f, 1.0f, null, null, 0, 0, true);
	this.big5Dec = big5Dec;
	this.b2cBmp = b2cBmp;
	this.b2cSupp = b2cSupp;
	}

	public char decodeSingle(int b) {
	return big5Dec.decodeSingle(b);
	}

	public char decodeBig5(int b1, int b2) {
	return big5Dec.decodeDouble(b1, b2);
	}

	public char decodeDouble(int b1, int b2) {
	return b2cBmp[b1][b2 - b2Min];
	}

	public char decodeDoubleEx(int b1, int b2) {
	/* if the b2cSupp is null, the subclass need
	to override the methold
	if (b2cSupp == null)
	return UNMAPPABLE_DECODING;
	*/
	return b2cSupp[b1][b2 - b2Min];
	}

	protected CoderResult decodeArrayLoop(ByteBuffer src, CharBuffer dst) {
	byte[] sa = src.array();
	int sp = src.arrayOffset() + src.position();
	int sl = src.arrayOffset() + src.limit();

	char[] da = dst.array();
	int dp = dst.arrayOffset() + dst.position();
	int dl = dst.arrayOffset() + dst.limit();

	try {
	while (sp < sl) {
	int b1 = sa[sp] & 0xff;
	char c = decodeSingle(b1);
	int inSize = 1, outSize = 1;
	char[] cc = null;
	if (c == UNMAPPABLE_DECODING) {
	if (sl - sp < 2)
	return CoderResult.UNDERFLOW;
	int b2 = sa[sp + 1] & 0xff;
	inSize++;
	if (b2 < b2Min \|\| b2 > b2Max)
	return CoderResult.unmappableForLength(2);
	c = decodeDouble(b1, b2); //bmp
	if (c == UNMAPPABLE_DECODING) {
	c = decodeDoubleEx(b1, b2); //supp
	if (c == UNMAPPABLE_DECODING) {
	c = decodeBig5(b1, b2); //big5
	if (c == UNMAPPABLE_DECODING)
	return CoderResult.unmappableForLength(2);
	} else {
	// supplementary character in u+2xxxx area
	outSize = 2;
	}
	}
	}
	if (dl - dp < outSize)
	return CoderResult.OVERFLOW;
	if (outSize == 2) {
	// supplementary characters
	da[dp++] = Surrogate.high(0x20000 + c);
	da[dp++] = Surrogate.low(0x20000 + c);
	} else {
	da[dp++] = c;
	}
	sp += inSize;
	}
	return CoderResult.UNDERFLOW;
	} finally {
	src.position(sp - src.arrayOffset());
	dst.position(dp - dst.arrayOffset());
	}
	}

	protected CoderResult decodeBufferLoop(ByteBuffer src, CharBuffer dst) {
	int mark = src.position();
	try {
	while (src.hasRemaining()) {
	char[] cc = null;
	int b1 = src.get() & 0xff;
	int inSize = 1, outSize = 1;
	char c = decodeSingle(b1);
	if (c == UNMAPPABLE_DECODING) {
	if (src.remaining() < 1)
	return CoderResult.UNDERFLOW;
	int b2 = src.get() & 0xff;
	inSize++;
	if (b2 < b2Min \|\| b2 > b2Max)
	return CoderResult.unmappableForLength(2);
	c = decodeDouble(b1, b2); //bmp
	if (c == UNMAPPABLE_DECODING) {
	c = decodeDoubleEx(b1, b2); //supp
	if (c == UNMAPPABLE_DECODING) {
	c = decodeBig5(b1, b2); //big5
	if (c == UNMAPPABLE_DECODING)
	return CoderResult.unmappableForLength(2);
	} else {
	outSize = 2;
	}
	}
	}
	if (dst.remaining() < outSize)
	return CoderResult.OVERFLOW;
	if (outSize == 2) {
	dst.put(Surrogate.high(0x20000 + c));
	dst.put(Surrogate.low(0x20000 + c));
	} else {
	dst.put(c);
	}
	mark += inSize;
	}
	return CoderResult.UNDERFLOW;
	} finally {
	src.position(mark);
	}
	}

	public int decode(byte[] src, int sp, int len, char[] dst) {
	int dp = 0;
	int sl = sp + len;
	char repl = replacement().charAt(0);
	while (sp < sl) {
	int b1 = src[sp++] & 0xff;
	char c = decodeSingle(b1);
	if (c == UNMAPPABLE_DECODING) {
	if (sl == sp) {
	c = repl;
	} else {
	int b2 = src[sp++] & 0xff;
	if (b2 < b2Min \|\| b2 > b2Max) {
	c = repl;
	} else if ((c = decodeDouble(b1, b2)) == UNMAPPABLE_DECODING) {
	c = decodeDoubleEx(b1, b2); //supp
	if (c == UNMAPPABLE_DECODING) {
	c = decodeBig5(b1, b2); //big5
	if (c == UNMAPPABLE_DECODING)
	c = repl;
	} else {
	// supplementary character in u+2xxxx area
	dst[dp++] = Surrogate.high(0x20000 + c);
	dst[dp++] = Surrogate.low(0x20000 + c);
	continue;
	}
	}
	}
	}
	dst[dp++] = c;
	}
	return dp;
	}

	public CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {
	if (src.hasArray() && dst.hasArray())
	return decodeArrayLoop(src, dst);
	else
	return decodeBufferLoop(src, dst);
	}

	public static void initb2c(char[][]b2c, String[] b2cStr)
	{
	for (int i = 0; i < b2cStr.length; i++) {
	if (b2cStr[i] == null)
	b2c[i] = DoubleByte.B2C_UNMAPPABLE;
	else
	b2c[i] = b2cStr[i].toCharArray();
	}
	}

	}

	public static class Encoder extends DoubleByte.Encoder {
	private DoubleByte.Encoder big5Enc;
	private char[][] c2bBmp;
	private char[][] c2bSupp;

	protected Encoder(Charset cs,
	DoubleByte.Encoder big5Enc,
	char[][] c2bBmp,
	char[][] c2bSupp)
	{
	super(cs, null, null, true);
	this.big5Enc = big5Enc;
	this.c2bBmp = c2bBmp;
	this.c2bSupp = c2bSupp;
	}

	public int encodeBig5(char ch) {
	return big5Enc.encodeChar(ch);
	}

	public int encodeChar(char ch) {
	int bb = c2bBmp[ch >> 8][ch & 0xff];
	if (bb == UNMAPPABLE_ENCODING)
	return encodeBig5(ch);
	return bb;
	}

	public int encodeSupp(int cp) {
	if ((cp & 0xf0000) != 0x20000)
	return UNMAPPABLE_ENCODING;
	return c2bSupp[(cp >> 8) & 0xff][cp & 0xff];
	}

	public boolean canEncode(char c) {
	return encodeChar(c) != UNMAPPABLE_ENCODING;
	}

	protected CoderResult encodeArrayLoop(CharBuffer src, ByteBuffer dst) {
	char[] sa = src.array();
	int sp = src.arrayOffset() + src.position();
	int sl = src.arrayOffset() + src.limit();

	byte[] da = dst.array();
	int dp = dst.arrayOffset() + dst.position();
	int dl = dst.arrayOffset() + dst.limit();

	try {
	while (sp < sl) {
	char c = sa[sp];
	int inSize = 1;
	int bb = encodeChar(c);
	if (bb == UNMAPPABLE_ENCODING) {
	if (Character.isSurrogate(c)) {
	int cp;
	if ((cp = sgp().parse(c, sa, sp, sl)) < 0)
	return sgp.error();
	bb = encodeSupp(cp);
	if (bb == UNMAPPABLE_ENCODING)
	return CoderResult.unmappableForLength(2);
	inSize = 2;
	} else {
	return CoderResult.unmappableForLength(1);
	}
	}
	if (bb > MAX_SINGLEBYTE) { // DoubleByte
	if (dl - dp < 2)
	return CoderResult.OVERFLOW;
	da[dp++] = (byte)(bb >> 8);
	da[dp++] = (byte)bb;
	} else { // SingleByte
	if (dl - dp < 1)
	return CoderResult.OVERFLOW;
	da[dp++] = (byte)bb;
	}
	sp += inSize;
	}
	return CoderResult.UNDERFLOW;
	} finally {
	src.position(sp - src.arrayOffset());
	dst.position(dp - dst.arrayOffset());
	}
	}

	protected CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) {
	int mark = src.position();
	try {
	while (src.hasRemaining()) {
	int inSize = 1;
	char c = src.get();
	int bb = encodeChar(c);
	if (bb == UNMAPPABLE_ENCODING) {
	if (Character.isSurrogate(c)) {
	int cp;
	if ((cp = sgp().parse(c, src)) < 0)
	return sgp.error();
	bb = encodeSupp(cp);
	if (bb == UNMAPPABLE_ENCODING)
	return CoderResult.unmappableForLength(2);
	inSize = 2;
	} else {
	return CoderResult.unmappableForLength(1);
	}
	}
	if (bb > MAX_SINGLEBYTE) { // DoubleByte
	if (dst.remaining() < 2)
	return CoderResult.OVERFLOW;
	dst.put((byte)(bb >> 8));
	dst.put((byte)(bb));
	} else {
	if (dst.remaining() < 1)
	return CoderResult.OVERFLOW;
	dst.put((byte)bb);
	}
	mark += inSize;
	}
	return CoderResult.UNDERFLOW;
	} finally {
	src.position(mark);
	}
	}

	protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {
	if (src.hasArray() && dst.hasArray())
	return encodeArrayLoop(src, dst);
	else
	return encodeBufferLoop(src, dst);
	}

	private byte[] repl = replacement();
	protected void implReplaceWith(byte[] newReplacement) {
	repl = newReplacement;
	}

	public int encode(char[] src, int sp, int len, byte[] dst) {
	int dp = 0;
	int sl = sp + len;
	while (sp < sl) {
	char c = src[sp++];
	int bb = encodeChar(c);
	if (bb == UNMAPPABLE_ENCODING) {
	if (!Character.isHighSurrogate(c) \|\| sp == sl \|\|
	!Character.isLowSurrogate(src[sp]) \|\|
	(bb = encodeSupp(Character.toCodePoint(c, src[sp++])))
	== UNMAPPABLE_ENCODING) {
	dst[dp++] = repl[0];
	if (repl.length > 1)
	dst[dp++] = repl[1];
	continue;
	}
	}
	if (bb > MAX_SINGLEBYTE) { // DoubleByte
	dst[dp++] = (byte)(bb >> 8);
	dst[dp++] = (byte)bb;
	} else { // SingleByte
	dst[dp++] = (byte)bb;
	}
	}
	return dp;
	}

	public int encodeFromUTF16(byte[] src, int sp, int len, byte[] dst) {
	int dp = 0;
	int sl = sp + len;
	int dl = dst.length;
	while (sp < sl) {
	char c = StringUTF16.getChar(src, sp++);
	int bb = encodeChar(c);
	if (bb == UNMAPPABLE_ENCODING) {
	if (!Character.isHighSurrogate(c) \|\| sp == sl \|\|
	!Character.isLowSurrogate(StringUTF16.getChar(src,sp)) \|\|
	(bb = encodeSupp(Character.toCodePoint(c, StringUTF16.getChar(src, sp++))))
	== UNMAPPABLE_ENCODING) {
	dst[dp++] = repl[0];
	if (repl.length > 1)
	dst[dp++] = repl[1];
	continue;
	}
	}
	if (bb > MAX_SINGLEBYTE) { // DoubleByte
	dst[dp++] = (byte)(bb >> 8);
	dst[dp++] = (byte)bb;
	} else { // SingleByte
	dst[dp++] = (byte)bb;
	}
	}
	return dp;
	}

	static char[] C2B_UNMAPPABLE = new char[0x100];
	static {
	Arrays.fill(C2B_UNMAPPABLE, (char)UNMAPPABLE_ENCODING);
	}

	public static void initc2b(char[][] c2b, String[] b2cStr, String pua) {
	// init c2b/c2bSupp from b2cStr and supp
	int b2Min = 0x40;
	Arrays.fill(c2b, C2B_UNMAPPABLE);
	for (int b1 = 0; b1 < 0x100; b1++) {
	String s = b2cStr[b1];
	if (s == null)
	continue;
	for (int i = 0; i < s.length(); i++) {
	char c = s.charAt(i);
	if (c == UNMAPPABLE_DECODING)
	continue;
	int hi = c >> 8;
	if (c2b[hi] == C2B_UNMAPPABLE) {
	c2b[hi] = new char[0x100];
	Arrays.fill(c2b[hi], (char)UNMAPPABLE_ENCODING);
	}
	c2b[hi][c & 0xff] = (char)((b1 << 8) \| (i + b2Min));
	}
	}
	if (pua != null) { // add the compatibility pua entries
	char c = '\ue000'; //first pua character
	for (int i = 0; i < pua.length(); i++) {
	char bb = pua.charAt(i);
	if (bb != UNMAPPABLE_DECODING) {
	int hi = c >> 8;
	if (c2b[hi] == C2B_UNMAPPABLE) {
	c2b[hi] = new char[0x100];
	Arrays.fill(c2b[hi], (char)UNMAPPABLE_ENCODING);
	}
	c2b[hi][c & 0xff] = bb;
	}
	c++;
	}
	}
	}
	}
	}

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