242 lines
7.9 KiB
Java
242 lines
7.9 KiB
Java
/*
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* Copyright (c) 2002, 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 DoubleByteEncoder
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extends CharsetEncoder
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{
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private short index1[];
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private String index2[];
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private final Surrogate.Parser sgp = new Surrogate.Parser();
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protected DoubleByteEncoder(Charset cs,
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short[] index1, String[] index2)
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{
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super(cs, 2.0f, 2.0f);
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this.index1 = index1;
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this.index2 = index2;
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}
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protected DoubleByteEncoder(Charset cs,
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short[] index1, String[] index2,
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float avg, float max)
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{
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super(cs, avg, max);
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this.index1 = index1;
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this.index2 = index2;
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}
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protected DoubleByteEncoder(Charset cs,
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short[] index1, String[] index2, byte[] repl)
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{
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super(cs, 2.0f, 2.0f, repl);
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this.index1 = index1;
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this.index2 = index2;
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}
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protected DoubleByteEncoder(Charset cs,
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short[] index1, String[] index2,
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byte[] repl, float avg, float max)
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{
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super(cs, avg, max,repl);
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this.index1 = index1;
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this.index2 = index2;
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}
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public boolean canEncode(char c) {
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return (encodeSingle(c) != -1 ||
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encodeDouble(c) != 0);
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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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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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try {
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while (sp < sl) {
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char c = sa[sp];
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if (Surrogate.is(c)) {
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if (sgp.parse(c, sa, sp, sl) < 0)
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return sgp.error();
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if (sl - sp < 2)
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return CoderResult.UNDERFLOW;
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char c2 = sa[sp + 1];
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byte[] outputBytes = new byte[2];
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outputBytes = encodeSurrogate(c, c2);
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if (outputBytes == null) {
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return sgp.unmappableResult();
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}
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else {
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if (dl - dp < 2)
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return CoderResult.OVERFLOW;
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da[dp++] = outputBytes[0];
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da[dp++] = outputBytes[1];
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sp += 2;
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continue;
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}
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}
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if (c >= '\uFFFE')
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return CoderResult.unmappableForLength(1);
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int b = encodeSingle(c);
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if (b != -1) { // Single Byte
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if (dl - dp < 1)
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return CoderResult.OVERFLOW;
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da[dp++] = (byte)b;
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sp++;
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continue;
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}
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int ncode = encodeDouble(c);
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if (ncode != 0 && c != '\u0000' ) {
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if (dl - dp < 2)
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return CoderResult.OVERFLOW;
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da[dp++] = (byte) ((ncode & 0xff00) >> 8);
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da[dp++] = (byte) (ncode & 0xff);
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sp++;
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continue;
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}
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return CoderResult.unmappableForLength(1);
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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 mark = src.position();
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try {
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while (src.hasRemaining()) {
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char c = src.get();
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if (Surrogate.is(c)) {
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int surr;
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if ((surr = sgp.parse(c, src)) < 0)
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return sgp.error();
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char c2 = Surrogate.low(surr);
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byte[] outputBytes = new byte[2];
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outputBytes = encodeSurrogate(c, c2);
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if (outputBytes == null) {
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return sgp.unmappableResult();
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} else {
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if (dst.remaining() < 2)
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return CoderResult.OVERFLOW;
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mark += 2;
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dst.put(outputBytes[0]);
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dst.put(outputBytes[1]);
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continue;
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}
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}
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if (c >= '\uFFFE')
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return CoderResult.unmappableForLength(1);
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int b = encodeSingle(c);
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if (b != -1) { // Single-byte character
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if (dst.remaining() < 1)
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return CoderResult.OVERFLOW;
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mark++;
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dst.put((byte)b);
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continue;
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}
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// Double Byte character
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int ncode = encodeDouble(c);
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if (ncode != 0 && c != '\u0000') {
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if (dst.remaining() < 2)
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return CoderResult.OVERFLOW;
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mark++;
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dst.put((byte) ((ncode & 0xff00) >> 8));
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dst.put((byte) ncode);
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continue;
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}
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return CoderResult.unmappableForLength(1);
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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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/*
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* Can be changed by subclass
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*/
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protected int encodeDouble(char ch) {
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int offset = index1[((ch & 0xff00) >> 8 )] << 8;
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return index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff));
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}
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/*
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* Can be changed by subclass
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*/
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protected int encodeSingle(char inputChar) {
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if (inputChar < 0x80)
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return (byte)inputChar;
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else
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return -1;
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}
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/**
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* Protected method which should be overridden by concrete DBCS
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* CharsetEncoder classes which included supplementary characters
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* within their mapping coverage.
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* null return value indicates surrogate values could not be
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* handled or encoded.
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*/
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protected byte[] encodeSurrogate(char highSurrogate, char lowSurrogate) {
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return null;
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}
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}
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