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	/*
	* Copyright (c) 2008, 2012, 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.Buffer;
	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 static sun.nio.cs.CharsetMapping.*;

	public class SingleByte
	{
	private static final CoderResult withResult(CoderResult cr,
	Buffer src, int sp,
	Buffer dst, int dp)
	{
	src.position(sp - src.arrayOffset());
	dst.position(dp - dst.arrayOffset());
	return cr;
	}

	final public static class Decoder extends CharsetDecoder
	implements ArrayDecoder {
	private final char[] b2c;

	public Decoder(Charset cs, char[] b2c) {
	super(cs, 1.0f, 1.0f);
	this.b2c = b2c;
	}

	private 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();

	CoderResult cr = CoderResult.UNDERFLOW;
	if ((dl - dp) < (sl - sp)) {
	sl = sp + (dl - dp);
	cr = CoderResult.OVERFLOW;
	}

	while (sp < sl) {
	char c = decode(sa[sp]);
	if (c == UNMAPPABLE_DECODING) {
	return withResult(CoderResult.unmappableForLength(1),
	src, sp, dst, dp);
	}
	da[dp++] = c;
	sp++;
	}
	return withResult(cr, src, sp, dst, dp);
	}

	private CoderResult decodeBufferLoop(ByteBuffer src, CharBuffer dst) {
	int mark = src.position();
	try {
	while (src.hasRemaining()) {
	char c = decode(src.get());
	if (c == UNMAPPABLE_DECODING)
	return CoderResult.unmappableForLength(1);
	if (!dst.hasRemaining())
	return CoderResult.OVERFLOW;
	dst.put(c);
	mark++;
	}
	return CoderResult.UNDERFLOW;
	} finally {
	src.position(mark);
	}
	}

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

	public final char decode(int b) {
	return b2c[b + 128];
	}

	private char repl = '\uFFFD';
	protected void implReplaceWith(String newReplacement) {
	repl = newReplacement.charAt(0);
	}

	public int decode(byte[] src, int sp, int len, char[] dst) {
	if (len > dst.length)
	len = dst.length;
	int dp = 0;
	while (dp < len) {
	dst[dp] = decode(src[sp++]);
	if (dst[dp] == UNMAPPABLE_DECODING) {
	dst[dp] = repl;
	}
	dp++;
	}
	return dp;
	}
	}

	final public static class Encoder extends CharsetEncoder
	implements ArrayEncoder {
	private Surrogate.Parser sgp;
	private final char[] c2b;
	private final char[] c2bIndex;

	public Encoder(Charset cs, char[] c2b, char[] c2bIndex) {
	super(cs, 1.0f, 1.0f);
	this.c2b = c2b;
	this.c2bIndex = c2bIndex;
	}

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

	public boolean isLegalReplacement(byte[] repl) {
	return ((repl.length == 1 && repl[0] == (byte)'?') \|\|
	super.isLegalReplacement(repl));
	}

	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();

	CoderResult cr = CoderResult.UNDERFLOW;
	if ((dl - dp) < (sl - sp)) {
	sl = sp + (dl - dp);
	cr = CoderResult.OVERFLOW;
	}

	while (sp < sl) {
	char c = sa[sp];
	int b = encode(c);
	if (b == UNMAPPABLE_ENCODING) {
	if (Character.isSurrogate(c)) {
	if (sgp == null)
	sgp = new Surrogate.Parser();
	if (sgp.parse(c, sa, sp, sl) < 0)
	return withResult(sgp.error(), src, sp, dst, dp);
	return withResult(sgp.unmappableResult(), src, sp, dst, dp);
	}
	return withResult(CoderResult.unmappableForLength(1),
	src, sp, dst, dp);
	}
	da[dp++] = (byte)b;
	sp++;
	}
	return withResult(cr, src, sp, dst, dp);
	}

	private CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) {
	int mark = src.position();
	try {
	while (src.hasRemaining()) {
	char c = src.get();
	int b = encode(c);
	if (b == UNMAPPABLE_ENCODING) {
	if (Character.isSurrogate(c)) {
	if (sgp == null)
	sgp = new Surrogate.Parser();
	if (sgp.parse(c, src) < 0)
	return sgp.error();
	return sgp.unmappableResult();
	}
	return CoderResult.unmappableForLength(1);
	}
	if (!dst.hasRemaining())
	return CoderResult.OVERFLOW;
	dst.put((byte)b);
	mark++;
	}
	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);
	}

	public final int encode(char ch) {
	char index = c2bIndex[ch >> 8];
	if (index == UNMAPPABLE_ENCODING)
	return UNMAPPABLE_ENCODING;
	return c2b[index + (ch & 0xff)];
	}

	private byte repl = (byte)'?';
	protected void implReplaceWith(byte[] newReplacement) {
	repl = newReplacement[0];
	}

	public int encode(char[] src, int sp, int len, byte[] dst) {
	int dp = 0;
	int sl = sp + Math.min(len, dst.length);
	while (sp < sl) {
	char c = src[sp++];
	int b = encode(c);
	if (b != UNMAPPABLE_ENCODING) {
	dst[dp++] = (byte)b;
	continue;
	}
	if (Character.isHighSurrogate(c) && sp < sl &&
	Character.isLowSurrogate(src[sp])) {
	if (len > dst.length) {
	sl++;
	len--;
	}
	sp++;
	}
	dst[dp++] = repl;
	}
	return dp;
	}
	}

	// init the c2b and c2bIndex tables from b2c.
	public static void initC2B(char[] b2c, char[] c2bNR,
	char[] c2b, char[] c2bIndex) {
	for (int i = 0; i < c2bIndex.length; i++)
	c2bIndex[i] = UNMAPPABLE_ENCODING;
	for (int i = 0; i < c2b.length; i++)
	c2b[i] = UNMAPPABLE_ENCODING;
	int off = 0;
	for (int i = 0; i < b2c.length; i++) {
	char c = b2c[i];
	if (c == UNMAPPABLE_DECODING)
	continue;
	int index = (c >> 8);
	if (c2bIndex[index] == UNMAPPABLE_ENCODING) {
	c2bIndex[index] = (char)off;
	off += 0x100;
	}
	index = c2bIndex[index] + (c & 0xff);
	c2b[index] = (char)((i>=0x80)?(i-0x80):(i+0x80));
	}
	if (c2bNR != null) {
	// c-->b nr entries
	int i = 0;
	while (i < c2bNR.length) {
	char b = c2bNR[i++];
	char c = c2bNR[i++];
	int index = (c >> 8);
	if (c2bIndex[index] == UNMAPPABLE_ENCODING) {
	c2bIndex[index] = (char)off;
	off += 0x100;
	}
	index = c2bIndex[index] + (c & 0xff);
	c2b[index] = b;
	}
	}
	}
	}

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