277 lines
8.7 KiB
Java
277 lines
8.7 KiB
Java
/*
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* Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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*/
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package sun.nio.cs.ext;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.charset.Charset;
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import java.nio.charset.CharsetEncoder;
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import java.nio.charset.CoderResult;
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import sun.nio.cs.Surrogate;
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public abstract class SimpleEUCEncoder
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extends CharsetEncoder
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{
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protected short index1[];
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protected String index2;
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protected String index2a;
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protected String index2b;
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protected String index2c;
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protected int mask1;
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protected int mask2;
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protected int shift;
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private byte[] outputByte = new byte[4];
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private final Surrogate.Parser sgp = new Surrogate.Parser();
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protected SimpleEUCEncoder(Charset cs)
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{
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super(cs, 3.0f, 4.0f);
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}
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/**
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* Returns true if the given character can be converted to the
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* target character encoding.
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*/
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public boolean canEncode(char ch) {
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int index;
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String theChars;
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index = index1[((ch & mask1) >> shift)] + (ch & mask2);
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if (index < 7500)
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theChars = index2;
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else
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if (index < 15000) {
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index = index - 7500;
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theChars = index2a;
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}
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else
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if (index < 22500){
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index = index - 15000;
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theChars = index2b;
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}
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else {
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index = index - 22500;
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theChars = index2c;
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}
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if (theChars.charAt(2*index) != '\u0000' ||
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theChars.charAt(2*index + 1) != '\u0000')
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return (true);
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// only return true if input char was unicode null - all others are
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// undefined
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return( ch == '\u0000');
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}
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private CoderResult encodeArrayLoop(CharBuffer src, ByteBuffer dst) {
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char[] sa = src.array();
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int sp = src.arrayOffset() + src.position();
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int sl = src.arrayOffset() + src.limit();
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assert (sp <= sl);
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sp = (sp <= sl ? sp : sl);
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byte[] da = dst.array();
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int dp = dst.arrayOffset() + dst.position();
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int dl = dst.arrayOffset() + dst.limit();
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assert (dp <= dl);
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dp = (dp <= dl ? dp : dl);
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int index;
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int spaceNeeded;
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int i;
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try {
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while (sp < sl) {
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boolean allZeroes = true;
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char inputChar = sa[sp];
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if (Character.isSurrogate(inputChar)) {
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if (sgp.parse(inputChar, sa, sp, sl) < 0)
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return sgp.error();
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return sgp.unmappableResult();
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}
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if (inputChar >= '\uFFFE')
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return CoderResult.unmappableForLength(1);
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String theChars;
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char aChar;
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// We have a valid character, get the bytes for it
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index = index1[((inputChar & mask1) >> shift)] + (inputChar & mask2);
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if (index < 7500)
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theChars = index2;
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else if (index < 15000) {
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index = index - 7500;
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theChars = index2a;
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} else if (index < 22500){
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index = index - 15000;
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theChars = index2b;
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}
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else {
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index = index - 22500;
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theChars = index2c;
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}
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aChar = theChars.charAt(2*index);
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outputByte[0] = (byte)((aChar & 0xff00)>>8);
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outputByte[1] = (byte)(aChar & 0x00ff);
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aChar = theChars.charAt(2*index + 1);
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outputByte[2] = (byte)((aChar & 0xff00)>>8);
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outputByte[3] = (byte)(aChar & 0x00ff);
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for (i = 0; i < outputByte.length; i++) {
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if (outputByte[i] != 0x00) {
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allZeroes = false;
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break;
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}
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}
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if (allZeroes && inputChar != '\u0000') {
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return CoderResult.unmappableForLength(1);
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}
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int oindex = 0;
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for (spaceNeeded = outputByte.length;
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spaceNeeded > 1; spaceNeeded--){
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if (outputByte[oindex++] != 0x00 )
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break;
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}
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if (dp + spaceNeeded > dl)
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return CoderResult.OVERFLOW;
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for (i = outputByte.length - spaceNeeded;
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i < outputByte.length; i++) {
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da[dp++] = outputByte[i];
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}
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sp++;
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}
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return CoderResult.UNDERFLOW;
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} finally {
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src.position(sp - src.arrayOffset());
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dst.position(dp - dst.arrayOffset());
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}
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}
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private CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) {
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int index;
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int spaceNeeded;
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int i;
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int mark = src.position();
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try {
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while (src.hasRemaining()) {
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char inputChar = src.get();
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boolean allZeroes = true;
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if (Character.isSurrogate(inputChar)) {
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if (sgp.parse(inputChar, src) < 0)
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return sgp.error();
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return sgp.unmappableResult();
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}
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if (inputChar >= '\uFFFE')
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return CoderResult.unmappableForLength(1);
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String theChars;
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char aChar;
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// We have a valid character, get the bytes for it
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index = index1[((inputChar & mask1) >> shift)] + (inputChar & mask2);
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if (index < 7500)
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theChars = index2;
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else if (index < 15000) {
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index = index - 7500;
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theChars = index2a;
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} else if (index < 22500){
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index = index - 15000;
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theChars = index2b;
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}
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else {
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index = index - 22500;
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theChars = index2c;
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}
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aChar = theChars.charAt(2*index);
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outputByte[0] = (byte)((aChar & 0xff00)>>8);
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outputByte[1] = (byte)(aChar & 0x00ff);
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aChar = theChars.charAt(2*index + 1);
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outputByte[2] = (byte)((aChar & 0xff00)>>8);
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outputByte[3] = (byte)(aChar & 0x00ff);
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for (i = 0; i < outputByte.length; i++) {
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if (outputByte[i] != 0x00) {
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allZeroes = false;
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break;
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}
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}
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if (allZeroes && inputChar != '\u0000') {
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return CoderResult.unmappableForLength(1);
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}
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int oindex = 0;
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for (spaceNeeded = outputByte.length;
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spaceNeeded > 1; spaceNeeded--){
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if (outputByte[oindex++] != 0x00 )
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break;
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}
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if (dst.remaining() < spaceNeeded)
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return CoderResult.OVERFLOW;
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for (i = outputByte.length - spaceNeeded;
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i < outputByte.length; i++) {
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dst.put(outputByte[i]);
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}
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mark++;
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}
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return CoderResult.UNDERFLOW;
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} finally {
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src.position(mark);
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}
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}
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protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {
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if (true && src.hasArray() && dst.hasArray())
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return encodeArrayLoop(src, dst);
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else
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return encodeBufferLoop(src, dst);
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}
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public byte encode(char inputChar) {
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return (byte)index2.charAt(index1[(inputChar & mask1) >> shift] +
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(inputChar & mask2));
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}
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}
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