1 /*
   2  * Copyright (c) 2002, 2006, Oracle and/or its affiliates. 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * 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.*;
  38 import sun.nio.cs.HistoricallyNamedCharset;
  39 
  40 public class ISO2022_CN_GB extends ISO2022 implements HistoricallyNamedCharset
  41 {
  42     public ISO2022_CN_GB() {
  43         super("x-ISO-2022-CN-GB",
  44                ExtendedCharsets.aliasesFor("x-ISO-2022-CN-GB"));
  45     }
  46 
  47     public boolean contains(Charset cs) {
  48         // overlapping repertoire of EUC_CN, GB2312
  49         return ((cs instanceof EUC_CN) ||
  50                 (cs.name().equals("US-ASCII")) ||
  51                 (cs instanceof ISO2022_CN_GB));
  52     }
  53 
  54     public String historicalName() {
  55         return "ISO2022CN_GB";
  56     }
  57 
  58     public CharsetDecoder newDecoder() {
  59         return new ISO2022_CN.Decoder(this);
  60     }
  61 
  62     public CharsetEncoder newEncoder() {
  63         return new Encoder(this);
  64     }
  65 
  66     private static class Encoder extends ISO2022.Encoder {
  67 
  68         public Encoder(Charset cs)
  69         {
  70             super(cs);
  71             SODesig = new byte[] { '$', ')', 'A'};
  72 
  73             try {
  74                 Charset cset = Charset.forName("EUC_CN"); // GB2312
  75                 ISOEncoder = cset.newEncoder();
  76             } catch (Exception e) { }
  77         }
  78 
  79         /*
  80          * Since ISO2022-CN-GB 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 }