Source Code Cross Referenced for CharToByteEUC_TW.java in  » 6.0-JDK-Modules-sun » io » sun » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules sun » io » sun.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 1996-2003 Sun Microsystems, Inc.  All Rights Reserved.
003:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004:         *
005:         * This code is free software; you can redistribute it and/or modify it
006:         * under the terms of the GNU General Public License version 2 only, as
007:         * published by the Free Software Foundation.  Sun designates this
008:         * particular file as subject to the "Classpath" exception as provided
009:         * by Sun in the LICENSE file that accompanied this code.
010:         *
011:         * This code is distributed in the hope that it will be useful, but WITHOUT
012:         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013:         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014:         * version 2 for more details (a copy is included in the LICENSE file that
015:         * accompanied this code).
016:         *
017:         * You should have received a copy of the GNU General Public License version
018:         * 2 along with this work; if not, write to the Free Software Foundation,
019:         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020:         *
021:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022:         * CA 95054 USA or visit www.sun.com if you need additional information or
023:         * have any questions.
024:         */
025:
026:        package sun.io;
027:
028:        import sun.nio.cs.ext.EUC_TW;
029:
030:        /*
031:         * @author Limin Shi
032:         */
033:
034:        public class CharToByteEUC_TW extends CharToByteConverter {
035:            private final byte MSB = (byte) 0x80;
036:            private final byte SS2 = (byte) 0x8E;
037:            private final byte P2 = (byte) 0xA2;
038:            private final byte P3 = (byte) 0xA3;
039:
040:            private final static EUC_TW nioCoder = new EUC_TW();
041:
042:            private static String uniTab1 = nioCoder.getUniTab1();
043:            private static String uniTab2 = nioCoder.getUniTab2();
044:            private static String uniTab3 = nioCoder.getUniTab3();
045:            private static String cnsTab1 = nioCoder.getCNSTab1();
046:            private static String cnsTab2 = nioCoder.getCNSTab2();
047:            private static String cnsTab3 = nioCoder.getCNSTab3();
048:
049:            public int flush(byte[] output, int outStart, int outEnd)
050:                    throws MalformedInputException {
051:                reset();
052:                return 0;
053:            }
054:
055:            public void reset() {
056:                byteOff = charOff = 0;
057:            }
058:
059:            public boolean canConvert(char ch) {
060:                if (((0xFF00 & ch) != 0) && (getNative(ch) != -1)) {
061:                    return true;
062:                }
063:                return false;
064:            }
065:
066:            /**
067:             * Character conversion
068:             */
069:            public int convert(char[] input, int inOff, int inEnd,
070:                    byte[] output, int outOff, int outEnd)
071:                    throws UnknownCharacterException, MalformedInputException,
072:                    ConversionBufferFullException {
073:                int outputSize;
074:                byte[] tmpbuf = new byte[4];
075:                byte[] outputByte;
076:
077:                byteOff = outOff;
078:
079:                //Fixed 4122961 by bringing the charOff++ out to this
080:                // loop where it belongs, changing the loop from
081:                // while(){} to for(){}.
082:                for (charOff = inOff; charOff < inEnd; charOff++) {
083:                    outputByte = tmpbuf;
084:                    if (input[charOff] < 0x80) { // ASCII
085:                        outputSize = 1;
086:                        outputByte[0] = (byte) (input[charOff] & 0x7f);
087:                    } else {
088:                        outputSize = unicodeToEUC(input[charOff], outputByte);
089:                    }
090:
091:                    if (outputSize == -1) {
092:                        if (subMode) {
093:                            outputByte = subBytes;
094:                            outputSize = subBytes.length;
095:                        } else {
096:                            badInputLength = 1;
097:                            throw new UnknownCharacterException();
098:                        }
099:                    }
100:
101:                    if (outEnd - byteOff < outputSize)
102:                        throw new ConversionBufferFullException();
103:
104:                    for (int i = 0; i < outputSize; i++)
105:                        output[byteOff++] = outputByte[i];
106:                }
107:
108:                return byteOff - outOff;
109:
110:            }
111:
112:            /**
113:             * returns the maximum number of bytes needed to convert a char
114:             */
115:            public int getMaxBytesPerChar() {
116:                return 4;
117:            }
118:
119:            /**
120:             * Return the character set ID
121:             */
122:            public String getCharacterEncoding() {
123:                return "EUC_TW";
124:            }
125:
126:            protected int getNative(char unicode) {
127:                int i, cns; // 2 chars in CNS table make 1 CNS code
128:
129:                if (unicode < UniTab2[0]) {
130:                    if ((i = searchTab(unicode, UniTab1)) == -1)
131:                        return -1;
132:                    cns = (CNSTab1[2 * i] << 16) + CNSTab1[2 * i + 1];
133:                    return cns;
134:                } else if (unicode < UniTab3[0]) {
135:                    if ((i = searchTab(unicode, UniTab2)) == -1)
136:                        return -1;
137:                    cns = (CNSTab2[2 * i] << 16) + CNSTab2[2 * i + 1];
138:                    return cns;
139:                } else {
140:                    if ((i = searchTab(unicode, UniTab3)) == -1)
141:                        return -1;
142:                    cns = (CNSTab3[2 * i] << 16) + CNSTab3[2 * i + 1];
143:                    return cns;
144:                }
145:            }
146:
147:            protected int searchTab(char code, char[] table) {
148:                int i = 0, l, h;
149:
150:                for (l = 0, h = table.length - 1; l < h;) {
151:                    if (table[l] == code) {
152:                        i = l;
153:                        break;
154:                    }
155:                    if (table[h] == code) {
156:                        i = h;
157:                        break;
158:                    }
159:                    i = (l + h) / 2;
160:                    if (table[i] == code)
161:                        break;
162:                    if (table[i] < code)
163:                        l = i + 1;
164:                    else
165:                        h = i - 1;
166:                }
167:                if (code == table[i]) {
168:                    return i;
169:                } else {
170:                    return -1;
171:                }
172:            }
173:
174:            private int unicodeToEUC(char unicode, byte ebyte[]) {
175:                int cns = getNative(unicode);
176:
177:                if ((cns >> 16) == 0x01) { // Plane 1
178:                    ebyte[0] = (byte) (((cns & 0xff00) >> 8) | MSB);
179:                    ebyte[1] = (byte) ((cns & 0xff) | MSB);
180:                    return 2;
181:                }
182:
183:                byte cnsPlane = (byte) (cns >> 16);
184:                if (cnsPlane >= (byte) 0x02) { // Plane 2
185:                    ebyte[0] = SS2;
186:                    ebyte[1] = (byte) (cnsPlane | (byte) 0xA0);
187:                    ebyte[2] = (byte) (((cns & 0xff00) >> 8) | MSB);
188:                    ebyte[3] = (byte) ((cns & 0xff) | MSB);
189:                    return 4;
190:                }
191:
192:                return -1;
193:            }
194:
195:            protected int unicodeToEUC(char unicode) {
196:                if (unicode <= 0x7F) { // ASCII falls into EUC_TW CS0
197:                    return unicode;
198:                }
199:
200:                int cns = getNative(unicode);
201:                int plane = cns >> 16;
202:                int euc = (cns & 0x0000FFFF) | 0x00008080;
203:
204:                if (plane == 1) {
205:                    return euc;
206:                } else if (plane == 2) {
207:                    return ((SS2 << 24) & 0xFF000000)
208:                            | ((P2 << 16) & 0x00FF0000) | euc;
209:                } else if (plane == 3) {
210:                    return ((SS2 << 24) & 0xFF000000)
211:                            | ((P3 << 16) & 0x00FF0000) | euc;
212:                }
213:
214:                return -1;
215:            }
216:
217:            private char[] UniTab1 = uniTab1.toCharArray();
218:            private char[] UniTab2 = uniTab2.toCharArray();
219:            private char[] UniTab3 = uniTab3.toCharArray();
220:            private char[] CNSTab1 = cnsTab1.toCharArray();
221:            private char[] CNSTab2 = cnsTab2.toCharArray();
222:            private char[] CNSTab3 = cnsTab3.toCharArray();
223:        }
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