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
29package sun.nio.cs.ext;
30
31import java.nio.charset.Charset;
32import java.nio.ByteBuffer;
33import java.nio.CharBuffer;
34import java.nio.charset.CharsetDecoder;
35import java.nio.charset.CharsetEncoder;
36import java.nio.charset.CoderResult;
37import sun.nio.cs.HistoricallyNamedCharset;
38import sun.nio.cs.*;
39
40public 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}
103