/* * 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;    }}