102 lines
3.3 KiB
Java
102 lines
3.3 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.charset.Charset;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.charset.CharsetDecoder;
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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.HistoricallyNamedCharset;
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public class ISO2022_CN_CNS extends ISO2022 implements HistoricallyNamedCharset
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{
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public ISO2022_CN_CNS() {
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super("x-ISO-2022-CN-CNS", ExtendedCharsets.aliasesFor("x-ISO-2022-CN-CNS"));
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}
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public boolean contains(Charset cs) {
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// overlapping repertoire of EUC_TW, CNS11643
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return ((cs instanceof EUC_TW) ||
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(cs.name().equals("US-ASCII")) ||
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(cs instanceof ISO2022_CN_CNS));
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}
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public String historicalName() {
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return "ISO2022CN_CNS";
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}
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public CharsetDecoder newDecoder() {
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return new ISO2022_CN.Decoder(this);
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}
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public CharsetEncoder newEncoder() {
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return new Encoder(this);
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}
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private static class Encoder extends ISO2022.Encoder {
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public Encoder(Charset cs)
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{
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super(cs);
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SODesig = "$)G";
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SS2Desig = "$*H";
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SS3Desig = "$+I";
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try {
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Charset cset = Charset.forName("EUC_TW"); // CNS11643
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ISOEncoder = cset.newEncoder();
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} catch (Exception e) { }
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}
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private byte[] bb = new byte[4];
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public boolean canEncode(char c) {
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int n = 0;
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return (c <= '\u007f' ||
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(n = ((EUC_TW.Encoder)ISOEncoder).toEUC(c, bb)) == 2 ||
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(n == 4 && bb[0] == SS2 &&
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(bb[1] == PLANE2 || bb[1] == PLANE3)));
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}
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/*
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* Since ISO2022-CN-CNS possesses a CharsetEncoder
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* without the corresponding CharsetDecoder half the
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* default replacement check needs to be overridden
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* since the parent class version attempts to
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* decode 0x3f (?).
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*/
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public boolean isLegalReplacement(byte[] repl) {
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// 0x3f is OK as the replacement byte
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return (repl.length == 1 && repl[0] == (byte) 0x3f);
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}
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}
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}
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