1 /*
2 * Copyright (c) 1996, 2005, 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 import static sun.nio.cs.CharsetMapping.*;
34
35 public class X11GB2312 extends Charset {
36 public X11GB2312 () {
37 super("X11GB2312", null);
38 }
39 public CharsetEncoder newEncoder() {
40 return new Encoder(this);
41 }
42 public CharsetDecoder newDecoder() {
43 return new Decoder(this);
44 }
45
46 public boolean contains(Charset cs) {
47 return cs instanceof X11GB2312;
48 }
49
50 private class Encoder extends CharsetEncoder {
51 private DoubleByte.Encoder enc = (DoubleByte.Encoder)new EUC_CN().newEncoder();
52
53 public Encoder(Charset cs) {
54 super(cs, 2.0f, 2.0f);
55 }
56
57 public boolean canEncode(char c) {
58 if (c <= 0x7F) {
59 return false;
60 }
61 return enc.canEncode(c);
62 }
63
64 protected int encodeDouble(char c) {
65 return enc.encodeChar(c);
66 }
67
68 protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {
69 char[] sa = src.array();
70 int sp = src.arrayOffset() + src.position();
71 int sl = src.arrayOffset() + src.limit();
72
73 byte[] da = dst.array();
74 int dp = dst.arrayOffset() + dst.position();
75 int dl = dst.arrayOffset() + dst.limit();
76
77 try {
78 while (sp < sl) {
79 char c = sa[sp];
80 if (c <= '\u007f')
81 return CoderResult.unmappableForLength(1);
82 int ncode = encodeDouble(c);
83 if (ncode != 0 && c != '\u0000' ) {
84 da[dp++] = (byte) ((ncode >> 8) & 0x7f);
85 da[dp++] = (byte) (ncode & 0x7f);
86 sp++;
87 continue;
88 }
89 return CoderResult.unmappableForLength(1);
90 }
91 return CoderResult.UNDERFLOW;
92 } finally {
93 src.position(sp - src.arrayOffset());
94 dst.position(dp - dst.arrayOffset());
95 }
96 }
97 public boolean isLegalReplacement(byte[] repl) {
98 return true;
99 }
100 }
101
102 private class Decoder extends CharsetDecoder {
103 private DoubleByte.Decoder dec = (DoubleByte.Decoder)new EUC_CN().newDecoder();
104
105 public Decoder(Charset cs) {
106 super(cs, 0.5f, 1.0f);
107 }
108
109 protected char decodeDouble(int b1, int b2) {
110 return dec.decodeDouble(b1, b2);
111 }
112
113 protected CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {
114 byte[] sa = src.array();
115 int sp = src.arrayOffset() + src.position();
116 int sl = src.arrayOffset() + src.limit();
117 assert (sp <= sl);
118 sp = (sp <= sl ? sp : sl);
119 char[] da = dst.array();
120 int dp = dst.arrayOffset() + dst.position();
121 int dl = dst.arrayOffset() + dst.limit();
122 assert (dp <= dl);
123 dp = (dp <= dl ? dp : dl);
124
125 try {
126 while (sp < sl) {
127 if ( sl - sp < 2) {
128 return CoderResult.UNDERFLOW;
129 }
130 int b1 = sa[sp] & 0xFF | 0x80;
131 int b2 = sa[sp + 1] & 0xFF | 0x80;
132 char c = decodeDouble(b1, b2);
133 if (c == UNMAPPABLE_DECODING) {
134 return CoderResult.unmappableForLength(2);
135 }
136 if (dl - dp < 1)
137 return CoderResult.OVERFLOW;
138 da[dp++] = c;
139 sp +=2;
140 }
141 return CoderResult.UNDERFLOW;
142 } finally {
143 src.position(sp - src.arrayOffset());
144 dst.position(dp - dst.arrayOffset());
145 }
146
147 }
148 }
149
150 }