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	/*
	* Copyright (c) 2002, 2006, 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.ext;

	import java.nio.ByteBuffer;
	import java.nio.CharBuffer;
	import java.nio.charset.Charset;
	import java.nio.charset.CharsetEncoder;
	import java.nio.charset.CoderResult;
	import sun.nio.cs.Surrogate;

	public abstract class DoubleByteEncoder
	extends CharsetEncoder
	{

	private short index1[];
	private String index2[];

	private final Surrogate.Parser sgp = new Surrogate.Parser();

	protected DoubleByteEncoder(Charset cs,
	short[] index1, String[] index2)
	{
	super(cs, 2.0f, 2.0f);
	this.index1 = index1;
	this.index2 = index2;
	}

	protected DoubleByteEncoder(Charset cs,
	short[] index1, String[] index2,
	float avg, float max)
	{
	super(cs, avg, max);
	this.index1 = index1;
	this.index2 = index2;
	}

	protected DoubleByteEncoder(Charset cs,
	short[] index1, String[] index2, byte[] repl)
	{
	super(cs, 2.0f, 2.0f, repl);
	this.index1 = index1;
	this.index2 = index2;
	}


	protected DoubleByteEncoder(Charset cs,
	short[] index1, String[] index2,
	byte[] repl, float avg, float max)
	{
	super(cs, avg, max,repl);
	this.index1 = index1;
	this.index2 = index2;
	}

	public boolean canEncode(char c) {
	return (encodeSingle(c) != -1 \|\|
	encodeDouble(c) != 0);
	}

	private 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];
	if (Character.isSurrogate(c)) {
	if (sgp.parse(c, sa, sp, sl) < 0)
	return sgp.error();
	if (sl - sp < 2)
	return CoderResult.UNDERFLOW;
	char c2 = sa[sp + 1];

	byte[] outputBytes = new byte[2];
	outputBytes = encodeSurrogate(c, c2);

	if (outputBytes == null) {
	return sgp.unmappableResult();
	}
	else {
	if (dl - dp < 2)
	return CoderResult.OVERFLOW;
	da[dp++] = outputBytes[0];
	da[dp++] = outputBytes[1];
	sp += 2;
	continue;
	}
	}
	if (c >= '\uFFFE')
	return CoderResult.unmappableForLength(1);

	int b = encodeSingle(c);
	if (b != -1) { // Single Byte
	if (dl - dp < 1)
	return CoderResult.OVERFLOW;
	da[dp++] = (byte)b;
	sp++;
	continue;
	}

	int ncode = encodeDouble(c);
	if (ncode != 0 && c != '\u0000' ) {
	if (dl - dp < 2)
	return CoderResult.OVERFLOW;
	da[dp++] = (byte) ((ncode & 0xff00) >> 8);
	da[dp++] = (byte) (ncode & 0xff);
	sp++;
	continue;
	}
	return CoderResult.unmappableForLength(1);
	}
	return CoderResult.UNDERFLOW;
	} finally {
	src.position(sp - src.arrayOffset());
	dst.position(dp - dst.arrayOffset());
	}
	}

	private CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) {
	int mark = src.position();

	try {
	while (src.hasRemaining()) {
	char c = src.get();
	if (Character.isSurrogate(c)) {
	int surr;
	if ((surr = sgp.parse(c, src)) < 0)
	return sgp.error();
	char c2 = Surrogate.low(surr);
	byte[] outputBytes = new byte[2];
	outputBytes = encodeSurrogate(c, c2);

	if (outputBytes == null) {
	return sgp.unmappableResult();
	} else {
	if (dst.remaining() < 2)
	return CoderResult.OVERFLOW;
	mark += 2;
	dst.put(outputBytes[0]);
	dst.put(outputBytes[1]);
	continue;
	}
	}
	if (c >= '\uFFFE')
	return CoderResult.unmappableForLength(1);
	int b = encodeSingle(c);

	if (b != -1) { // Single-byte character
	if (dst.remaining() < 1)
	return CoderResult.OVERFLOW;
	mark++;
	dst.put((byte)b);
	continue;
	}
	// Double Byte character

	int ncode = encodeDouble(c);
	if (ncode != 0 && c != '\u0000') {
	if (dst.remaining() < 2)
	return CoderResult.OVERFLOW;
	mark++;
	dst.put((byte) ((ncode & 0xff00) >> 8));
	dst.put((byte) ncode);
	continue;
	}
	return CoderResult.unmappableForLength(1);
	}

	return CoderResult.UNDERFLOW;
	} finally {
	src.position(mark);
	}
	}

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

	/*
	* Can be changed by subclass
	*/
	protected int encodeDouble(char ch) {
	int offset = index1[((ch & 0xff00) >> 8 )] << 8;
	return index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff));
	}

	/*
	* Can be changed by subclass
	*/
	protected int encodeSingle(char inputChar) {
	if (inputChar < 0x80)
	return (byte)inputChar;
	else
	return -1;
	}

	/**
	* Protected method which should be overridden by concrete DBCS
	* CharsetEncoder classes which included supplementary characters
	* within their mapping coverage.
	* null return value indicates surrogate values could not be
	* handled or encoded.
	*/
	protected byte[] encodeSurrogate(char highSurrogate, char lowSurrogate) {
	return null;
	}
	}

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