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.HistoricallyNamedCharset; 38 import sun.nio.cs.*; 39 40 public class ISO2022_CN_CNS extends ISO2022 implements HistoricallyNamedCharset 41 { 42 public ISO2022_CN_CNS() { 43 super("x-ISO-2022-CN-CNS", ExtendedCharsets.aliasesFor("x-ISO-2022-CN-CNS")); 44 } 45 46 public boolean contains(Charset cs) { 47 // overlapping repertoire of EUC_TW, CNS11643 48 return ((cs instanceof EUC_TW) || 49 (cs.name().equals("US-ASCII")) || 50 (cs instanceof ISO2022_CN_CNS)); 51 } 52 53 public String historicalName() { 54 return "ISO2022CN_CNS"; 55 } 56 57 public CharsetDecoder newDecoder() { 58 return new ISO2022_CN.Decoder(this); 59 } 60 61 public CharsetEncoder newEncoder() { 62 return new Encoder(this); 63 } 64 65 private static class Encoder extends ISO2022.Encoder { 66 67 public Encoder(Charset cs) 68 { 69 super(cs); 70 SODesig = new byte[] {'$', ')', 'G' }; 71 SS2Desig = new byte[] {'$', '*', 'H' }; 72 SS3Desig = new byte[] {'$', '+', 'I' }; 73 74 try { 75 Charset cset = Charset.forName("EUC_TW"); // CNS11643 76 ISOEncoder = cset.newEncoder(); 77 } catch (Exception e) { } 78 } 79 80 private byte[] bb = new byte[4]; 81 public boolean canEncode(char c) { 82 int n = 0; 83 return (c <= '\u007f' || 84 (n = ((EUC_TW.Encoder)ISOEncoder).toEUC(c, bb)) == 2 || 85 (n == 4 && bb[0] == SS2 && 86 (bb[1] == PLANE2 || bb[1] == PLANE3))); 87 } 88 89 /* 90 * Since ISO2022-CN-CNS possesses a CharsetEncoder 91 * without the corresponding CharsetDecoder half the 92 * default replacement check needs to be overridden 93 * since the parent class version attempts to 94 * decode 0x3f (?). 95 */ 96 97 public boolean isLegalReplacement(byte[] repl) { 98 // 0x3f is OK as the replacement byte 99 return (repl.length == 1 && repl[0] == (byte) 0x3f); 100 } 101 } 102 }