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.ext.*;
32 import static sun.nio.cs.CharsetMapping.*;
33
34 public class X11GB2312 extends Charset {
35 public X11GB2312 () {
36 super("X11GB2312", null);
37 }
38 public CharsetEncoder newEncoder() {
39 return new Encoder(this);
40 }
41 public CharsetDecoder newDecoder() {
42 return new Decoder(this);
43 }
44
45 public boolean contains(Charset cs) {
46 return cs instanceof X11GB2312;
47 }
48
49 private class Encoder extends CharsetEncoder {
50 private DoubleByte.Encoder enc = (DoubleByte.Encoder)new EUC_CN().newEncoder();
51
52 public Encoder(Charset cs) {
53 super(cs, 2.0f, 2.0f);
54 }
55
56 public boolean canEncode(char c) {
57 if (c <= 0x7F) {
58 return false;
59 }
60 return enc.canEncode(c);
61 }
62
63 protected int encodeDouble(char c) {
64 return enc.encodeChar(c);
65 }
66
67 protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {
68 char[] sa = src.array();
69 int sp = src.arrayOffset() + src.position();
70 int sl = src.arrayOffset() + src.limit();
71
72 byte[] da = dst.array();
73 int dp = dst.arrayOffset() + dst.position();
74 int dl = dst.arrayOffset() + dst.limit();
75
76 try {
77 while (sp < sl) {
78 char c = sa[sp];
79 if (c <= '\u007f')
80 return CoderResult.unmappableForLength(1);
81 int ncode = encodeDouble(c);
82 if (ncode != 0 && c != '\u0000' ) {
83 da[dp++] = (byte) ((ncode >> 8) & 0x7f);
84 da[dp++] = (byte) (ncode & 0x7f);
85 sp++;
86 continue;
87 }
88 return CoderResult.unmappableForLength(1);
89 }
90 return CoderResult.UNDERFLOW;
91 } finally {
92 src.position(sp - src.arrayOffset());
93 dst.position(dp - dst.arrayOffset());
94 }
95 }
96 public boolean isLegalReplacement(byte[] repl) {
97 return true;
98 }
99 }
100
101 private class Decoder extends CharsetDecoder {
102 private DoubleByte.Decoder dec = (DoubleByte.Decoder)new EUC_CN().newDecoder();
103
104 public Decoder(Charset cs) {
105 super(cs, 0.5f, 1.0f);
106 }
107
108 protected char decodeDouble(int b1, int b2) {
109 return dec.decodeDouble(b1, b2);
110 }
111
112 protected CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {
113 byte[] sa = src.array();
114 int sp = src.arrayOffset() + src.position();
115 int sl = src.arrayOffset() + src.limit();
116 assert (sp <= sl);
117 sp = (sp <= sl ? sp : sl);
118 char[] da = dst.array();
119 int dp = dst.arrayOffset() + dst.position();
120 int dl = dst.arrayOffset() + dst.limit();
121 assert (dp <= dl);
122 dp = (dp <= dl ? dp : dl);
123
124 try {
125 while (sp < sl) {
126 if ( sl - sp < 2) {
127 return CoderResult.UNDERFLOW;
128 }
129 int b1 = sa[sp] & 0xFF | 0x80;
130 int b2 = sa[sp + 1] & 0xFF | 0x80;
131 char c = decodeDouble(b1, b2);
132 if (c == UNMAPPABLE_DECODING) {
133 return CoderResult.unmappableForLength(2);
134 }
135 if (dl - dp < 1)
136 return CoderResult.OVERFLOW;
137 da[dp++] = c;
138 sp +=2;
139 }
140 return CoderResult.UNDERFLOW;
141 } finally {
142 src.position(sp - src.arrayOffset());
143 dst.position(dp - dst.arrayOffset());
144 }
145
146 }
147 }
148
149 }