1/*
2 * Copyright (c) 2000, 2012, 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
30import java.nio.ByteBuffer;
31import java.nio.CharBuffer;
32import java.nio.charset.Charset;
33import java.nio.charset.CharsetEncoder;
34import java.nio.charset.CoderResult;
35import java.nio.charset.CharacterCodingException;
36import java.nio.charset.MalformedInputException;
37import java.nio.charset.UnmappableCharacterException;
38import sun.nio.cs.Surrogate;
39
40
41public abstract class SingleByteEncoder
42    extends CharsetEncoder
43{
44
45    private final short index1[];
46    private final String index2;
47    private final int mask1;
48    private final int mask2;
49    private final int shift;
50
51    private final Surrogate.Parser sgp = new Surrogate.Parser();
52
53    protected SingleByteEncoder(Charset cs,
54                                short[] index1, String index2,
55                                int mask1, int mask2, int shift)
56    {
57        super(cs, 1.0f, 1.0f);
58        this.index1 = index1;
59        this.index2 = index2;
60        this.mask1 = mask1;
61        this.mask2 = mask2;
62        this.shift = shift;
63    }
64
65    public boolean canEncode(char c) {
66        char testEncode = index2.charAt(index1[(c & mask1) >> shift]
67                                        + (c & mask2));
68        return testEncode != '\u0000' || c == '\u0000';
69    }
70
71    private CoderResult encodeArrayLoop(CharBuffer src, ByteBuffer dst) {
72        char[] sa = src.array();
73        int sp = src.arrayOffset() + src.position();
74        int sl = src.arrayOffset() + src.limit();
75        assert (sp <= sl);
76        sp = (sp <= sl ? sp : sl);
77        byte[] da = dst.array();
78        int dp = dst.arrayOffset() + dst.position();
79        int dl = dst.arrayOffset() + dst.limit();
80        assert (dp <= dl);
81        dp = (dp <= dl ? dp : dl);
82
83        try {
84            while (sp < sl) {
85                char c = sa[sp];
86                if (Character.isSurrogate(c)) {
87                    if (sgp.parse(c, sa, sp, sl) < 0)
88                        return sgp.error();
89                    return sgp.unmappableResult();
90                }
91                if (c >= '\uFFFE')
92                    return CoderResult.unmappableForLength(1);
93                if (dl - dp < 1)
94                    return CoderResult.OVERFLOW;
95
96                char e = index2.charAt(index1[(c & mask1) >> shift]
97                                       + (c & mask2));
98
99                // If output byte is zero because input char is zero
100                // then character is mappable, o.w. fail
101                if (e == '\u0000' && c != '\u0000')
102                    return CoderResult.unmappableForLength(1);
103
104                sp++;
105                da[dp++] = (byte)e;
106            }
107            return CoderResult.UNDERFLOW;
108        } finally {
109            src.position(sp - src.arrayOffset());
110            dst.position(dp - dst.arrayOffset());
111        }
112    }
113
114    private CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) {
115        int mark = src.position();
116        try {
117            while (src.hasRemaining()) {
118                char c = src.get();
119                if (Character.isSurrogate(c)) {
120                    if (sgp.parse(c, src) < 0)
121                        return sgp.error();
122                    return sgp.unmappableResult();
123                }
124                if (c >= '\uFFFE')
125                    return CoderResult.unmappableForLength(1);
126                if (!dst.hasRemaining())
127                    return CoderResult.OVERFLOW;
128
129                char e = index2.charAt(index1[(c & mask1) >> shift]
130                                       + (c & mask2));
131
132                // If output byte is zero because input char is zero
133                // then character is mappable, o.w. fail
134                if (e == '\u0000' && c != '\u0000')
135                    return CoderResult.unmappableForLength(1);
136
137                mark++;
138                dst.put((byte)e);
139            }
140            return CoderResult.UNDERFLOW;
141        } finally {
142            src.position(mark);
143        }
144    }
145
146    protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {
147        if (true && src.hasArray() && dst.hasArray())
148            return encodeArrayLoop(src, dst);
149        else
150            return encodeBufferLoop(src, dst);
151    }
152
153    public byte encode(char inputChar) {
154        return (byte)index2.charAt(index1[(inputChar & mask1) >> shift] +
155                (inputChar & mask2));
156    }
157}
158