1 /*
2 * Copyright (c) 2001, 2008, 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 package sun.awt.motif;
27
28 import java.nio.CharBuffer;
29 import java.nio.ByteBuffer;
30 import java.nio.charset.*;
31 import sun.nio.cs.*;
32 import sun.nio.cs.ext.*;
33
34 public abstract class X11CNS11643 extends Charset {
35 private final int plane;
36 public X11CNS11643 (int plane, String name) {
37 super(name, null);
38 switch (plane) {
39 case 1:
40 this.plane = 0; // CS1
41 break;
42 case 2:
43 case 3:
44 this.plane = plane;
45 break;
46 default:
47 throw new IllegalArgumentException
48 ("Only planes 1, 2, and 3 supported");
49 }
50 }
51
52 public CharsetEncoder newEncoder() {
53 return new Encoder(this, plane);
54 }
55
56 public CharsetDecoder newDecoder() {
57 return new Decoder(this, plane);
58 }
59
60 public boolean contains(Charset cs) {
61 return cs instanceof X11CNS11643;
62 }
63
64 private class Encoder extends EUC_TW.Encoder {
65 private int plane;
66 public Encoder(Charset cs, int plane) {
67 super(cs);
68 this.plane = plane;
69 }
70
71 private byte[] bb = new byte[4];
72 public boolean canEncode(char c) {
73 if (c <= 0x7F) {
74 return false;
75 }
76 int nb = toEUC(c, bb);
77 if (nb == -1)
78 return false;
79 int p = 0;
80 if (nb == 4)
81 p = (bb[1] & 0xff) - 0xa0;
82 return (p == plane);
83 }
84
85 public boolean isLegalReplacement(byte[] repl) {
86 return true;
87 }
88
89 protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {
90 char[] sa = src.array();
91 int sp = src.arrayOffset() + src.position();
92 int sl = src.arrayOffset() + src.limit();
93 byte[] da = dst.array();
94 int dp = dst.arrayOffset() + dst.position();
95 int dl = dst.arrayOffset() + dst.limit();
96
97 try {
98 while (sp < sl) {
99 char c = sa[sp];
100 if ( c > '\u007f'&& c < '\uFFFE') {
101 int nb = toEUC(c, bb);
102 if (nb != -1) {
103 int p = 0;
104 if (nb == 4)
105 p = (bb[1] & 0xff) - 0xa0;
106 if (p == plane) {
107 if (dl - dp < 2)
108 return CoderResult.OVERFLOW;
109 if (nb == 2) {
110 da[dp++] = (byte)(bb[0] & 0x7f);
111 da[dp++] = (byte)(bb[1] & 0x7f);
112 } else {
113 da[dp++] = (byte)(bb[2] & 0x7f);
114 da[dp++] = (byte)(bb[3] & 0x7f);
115 }
116 sp++;
117 continue;
118 }
119 }
120 }
121 return CoderResult.unmappableForLength(1);
122 }
123 return CoderResult.UNDERFLOW;
124 } finally {
125 src.position(sp - src.arrayOffset());
126 dst.position(dp - dst.arrayOffset());
127 }
128 }
129 }
130
131 private class Decoder extends EUC_TW.Decoder {
132 int plane;
133 private String table;
134 protected Decoder(Charset cs, int plane) {
135 super(cs);
136 if (plane == 0)
137 this.plane = plane;
138 else if (plane == 2 || plane == 3)
139 this.plane = plane - 1;
140 else
141 throw new IllegalArgumentException
142 ("Only planes 1, 2, and 3 supported");
143 }
144
145 //we only work on array backed buffer.
146 protected CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {
147 byte[] sa = src.array();
148 int sp = src.arrayOffset() + src.position();
149 int sl = src.arrayOffset() + src.limit();
150
151 char[] da = dst.array();
152 int dp = dst.arrayOffset() + dst.position();
153 int dl = dst.arrayOffset() + dst.limit();
154
155 try {
156 while (sp < sl) {
157 if ( sl - sp < 2) {
158 return CoderResult.UNDERFLOW;
159 }
160 int b1 = (sa[sp] & 0xff) | 0x80;
161 int b2 = (sa[sp + 1] & 0xff) | 0x80;
162 char[] cc = toUnicode(b1, b2, plane);
163 // plane3 has non-bmp characters(added), x11cnsp3
164 // however does not support them
165 if (cc == null || cc.length == 2)
166 return CoderResult.unmappableForLength(2);
167 if (dl - dp < 1)
168 return CoderResult.OVERFLOW;
169 da[dp++] = cc[0];
170 sp +=2;
171 }
172 return CoderResult.UNDERFLOW;
173 } finally {
174 src.position(sp - src.arrayOffset());
175 dst.position(dp - dst.arrayOffset());
176 }
177 }
178 }
179 }