1 /*
   2  * Copyright 2002-2006 Sun Microsystems, Inc.  All Rights Reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Sun designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Sun in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  22  * CA 95054 USA or visit www.sun.com if you need additional information or
  23  * have any questions.
  24  */
  25 
  26 /*
  27  */
  28 
  29 package sun.nio.cs.ext;
  30 
  31 import java.nio.charset.Charset;
  32 import java.nio.ByteBuffer;
  33 import java.nio.CharBuffer;
  34 import java.nio.charset.CharsetDecoder;
  35 import java.nio.charset.CharsetEncoder;
  36 import java.nio.charset.CoderResult;
  37 import sun.nio.cs.HistoricallyNamedCharset;
  38 
  39 public class ISO2022_CN_CNS extends ISO2022 implements HistoricallyNamedCharset
  40 {
  41     public ISO2022_CN_CNS() {
  42         super("x-ISO-2022-CN-CNS", ExtendedCharsets.aliasesFor("x-ISO-2022-CN-CNS"));
  43     }
  44 
  45     public boolean contains(Charset cs) {
  46         // overlapping repertoire of EUC_TW, CNS11643
  47         return ((cs instanceof EUC_TW) ||
  48                 (cs.name().equals("US-ASCII")) ||
  49                 (cs instanceof ISO2022_CN_CNS));
  50     }
  51 
  52     public String historicalName() {
  53         return "ISO2022CN_CNS";
  54     }
  55 
  56     public CharsetDecoder newDecoder() {
  57         return new ISO2022_CN.Decoder(this);
  58     }
  59 
  60     public CharsetEncoder newEncoder() {
  61         return new Encoder(this);
  62     }
  63 
  64     private static class Encoder extends ISO2022.Encoder {
  65 
  66         public Encoder(Charset cs)
  67         {
  68             super(cs);
  69             SODesig = "$)G";
  70             SS2Desig = "$*H";
  71             SS3Desig = "$+I";
  72 
  73             try {
  74                 Charset cset = Charset.forName("EUC_TW"); // CNS11643
  75                 ISOEncoder = cset.newEncoder();
  76             } catch (Exception e) { }
  77         }
  78 
  79         /*
  80          * Since ISO2022-CN-CNS possesses a CharsetEncoder
  81          * without the corresponding CharsetDecoder half the
  82          * default replacement check needs to be overridden
  83          * since the parent class version attempts to
  84          * decode 0x3f (?).
  85          */
  86 
  87         public boolean isLegalReplacement(byte[] repl) {
  88             // 0x3f is OK as the replacement byte
  89             return (repl.length == 1 && repl[0] == (byte) 0x3f);
  90         }
  91     }
  92 }