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