1 /*
2 * Copyright (c) 2000, 2004, 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
29 package sun.nio.cs;
30
31 import java.nio.ByteBuffer;
32 import java.nio.CharBuffer;
33 import java.nio.charset.Charset;
34 import java.nio.charset.CharsetEncoder;
35 import java.nio.charset.CoderResult;
36 import java.nio.charset.CharacterCodingException;
37 import java.nio.charset.MalformedInputException;
38 import java.nio.charset.UnmappableCharacterException;
39 import sun.nio.cs.Surrogate;
40
41
42 public abstract class SingleByteEncoder
43 extends CharsetEncoder
44 {
45
46 private final short index1[];
47 private final String index2;
48 private final int mask1;
49 private final int mask2;
50 private final int shift;
51
52 private final Surrogate.Parser sgp = new Surrogate.Parser();
53
54 protected SingleByteEncoder(Charset cs,
55 short[] index1, String index2,
56 int mask1, int mask2, int shift)
57 {
58 super(cs, 1.0f, 1.0f);
59 this.index1 = index1;
60 this.index2 = index2;
61 this.mask1 = mask1;
62 this.mask2 = mask2;
63 this.shift = shift;
64 }
65
66 public boolean canEncode(char c) {
67 char testEncode = index2.charAt(index1[(c & mask1) >> shift]
68 + (c & mask2));
69 return testEncode != '\u0000' || c == '\u0000';
70 }
71
72 private CoderResult encodeArrayLoop(CharBuffer src, ByteBuffer dst) {
73 char[] sa = src.array();
74 int sp = src.arrayOffset() + src.position();
75 int sl = src.arrayOffset() + src.limit();
76 assert (sp <= sl);
77 sp = (sp <= sl ? sp : sl);
78 byte[] da = dst.array();
79 int dp = dst.arrayOffset() + dst.position();
80 int dl = dst.arrayOffset() + dst.limit();
81 assert (dp <= dl);
82 dp = (dp <= dl ? dp : dl);
83
84 try {
85 while (sp < sl) {
86 char c = sa[sp];
87 if (Character.isSurrogate(c)) {
88 if (sgp.parse(c, sa, sp, sl) < 0)
89 return sgp.error();
90 return sgp.unmappableResult();
91 }
92 if (c >= '\uFFFE')
93 return CoderResult.unmappableForLength(1);
94 if (dl - dp < 1)
95 return CoderResult.OVERFLOW;
96
97 char e = index2.charAt(index1[(c & mask1) >> shift]
98 + (c & mask2));
99
100 // If output byte is zero because input char is zero
101 // then character is mappable, o.w. fail
102 if (e == '\u0000' && c != '\u0000')
103 return CoderResult.unmappableForLength(1);
104
105 sp++;
106 da[dp++] = (byte)e;
107 }
108 return CoderResult.UNDERFLOW;
109 } finally {
110 src.position(sp - src.arrayOffset());
111 dst.position(dp - dst.arrayOffset());
112 }
113 }
114
115 private CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) {
116 int mark = src.position();
117 try {
118 while (src.hasRemaining()) {
119 char c = src.get();
120 if (Character.isSurrogate(c)) {
121 if (sgp.parse(c, src) < 0)
122 return sgp.error();
123 return sgp.unmappableResult();
124 }
125 if (c >= '\uFFFE')
126 return CoderResult.unmappableForLength(1);
127 if (!dst.hasRemaining())
128 return CoderResult.OVERFLOW;
129
130 char e = index2.charAt(index1[(c & mask1) >> shift]
131 + (c & mask2));
132
133 // If output byte is zero because input char is zero
134 // then character is mappable, o.w. fail
135 if (e == '\u0000' && c != '\u0000')
136 return CoderResult.unmappableForLength(1);
137
138 mark++;
139 dst.put((byte)e);
140 }
141 return CoderResult.UNDERFLOW;
142 } finally {
143 src.position(mark);
144 }
145 }
146
147 protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {
148 if (true && src.hasArray() && dst.hasArray())
149 return encodeArrayLoop(src, dst);
150 else
151 return encodeBufferLoop(src, dst);
152 }
153
154 public byte encode(char inputChar) {
155 return (byte)index2.charAt(index1[(inputChar & mask1) >> shift] +
156 (inputChar & mask2));
157 }
158 }