Source Code Cross Referenced for CharToByteUTF8.java in  » 6.0-JDK-Modules » j2me » 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 » j2me » sun.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)CharToByteUTF8.java	1.19 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.  
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
006:         *   
007:         * This program is free software; you can redistribute it and/or  
008:         * modify it under the terms of the GNU General Public License version  
009:         * 2 only, as published by the Free Software Foundation.   
010:         *   
011:         * This program is distributed in the hope that it will be useful, but  
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of  
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
014:         * General Public License version 2 for more details (a copy is  
015:         * included at /legal/license.txt).   
016:         *   
017:         * You should have received a copy of the GNU General Public License  
018:         * version 2 along with this work; if not, write to the Free Software  
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
020:         * 02110-1301 USA   
021:         *   
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
023:         * Clara, CA 95054 or visit www.sun.com if you need additional  
024:         * information or have any questions. 
025:         *
026:         */
027:        package sun.io;
028:
029:        /**
030:         * UCS2 (UTF16) -> UCS Transformation Format 8 (UTF-8) converter
031:         * It's represented like below.
032:         *
033:         * # Bits   Bit pattern
034:         * 1    7   0xxxxxxx
035:         * 2   11   110xxxxx 10xxxxxx
036:         * 3   16   1110xxxx 10xxxxxx 10xxxxxx
037:         * 4   21   11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
038:         * 5   26   111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
039:         * 6   31   1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
040:         *
041:         *     UCS2 uses 1-3 / UTF16 uses 1-4 / UCS4 uses 1-6
042:         */
043:
044:        public class CharToByteUTF8 extends CharToByteConverter {
045:
046:            private char highHalfZoneCode;
047:
048:            public int flush(byte[] output, int outStart, int outEnd)
049:                    throws MalformedInputException {
050:                if (highHalfZoneCode != 0) {
051:                    highHalfZoneCode = 0;
052:                    badInputLength = 0;
053:                    throw new MalformedInputException();
054:                }
055:                byteOff = charOff = 0;
056:                return 0;
057:            }
058:
059:            /**
060:             * Character conversion
061:             */
062:            public int convert(char[] input, int inOff, int inEnd,
063:                    byte[] output, int outOff, int outEnd)
064:                    throws ConversionBufferFullException,
065:                    MalformedInputException {
066:                char inputChar;
067:                byte[] outputByte = new byte[6];
068:                int inputSize;
069:                int outputSize;
070:
071:                charOff = inOff;
072:                byteOff = outOff;
073:
074:                if (highHalfZoneCode != 0) {
075:                    inputChar = highHalfZoneCode;
076:                    highHalfZoneCode = 0;
077:                    if (input[inOff] >= 0xdc00 && input[inOff] <= 0xdfff) {
078:                        // This is legal UTF16 sequence.
079:                        int ucs4 = (highHalfZoneCode - 0xd800) * 0x400
080:                                + (input[inOff] - 0xdc00) + 0x10000;
081:                        output[0] = (byte) (0xf0 | ((ucs4 >> 18)) & 0x07);
082:                        output[1] = (byte) (0x80 | ((ucs4 >> 12) & 0x3f));
083:                        output[2] = (byte) (0x80 | ((ucs4 >> 6) & 0x3f));
084:                        output[3] = (byte) (0x80 | (ucs4 & 0x3f));
085:                        charOff++;
086:                        highHalfZoneCode = 0;
087:                    } else {
088:                        // This is illegal UTF16 sequence.
089:                        badInputLength = 0;
090:                        throw new MalformedInputException();
091:                    }
092:                }
093:
094:                while (charOff < inEnd) {
095:                    inputChar = input[charOff];
096:                    if (inputChar < 0x80) {
097:                        outputByte[0] = (byte) inputChar;
098:                        inputSize = 1;
099:                        outputSize = 1;
100:                    } else if (inputChar < 0x800) {
101:                        outputByte[0] = (byte) (0xc0 | ((inputChar >> 6) & 0x1f));
102:                        outputByte[1] = (byte) (0x80 | (inputChar & 0x3f));
103:                        inputSize = 1;
104:                        outputSize = 2;
105:                    } else if (inputChar >= 0xd800 && inputChar <= 0xdbff) {
106:                        // this is <high-half zone code> in UTF-16
107:                        if (charOff + 1 >= inEnd) {
108:                            highHalfZoneCode = inputChar;
109:                            break;
110:                        }
111:                        // check next char is valid <low-half zone code>
112:                        char lowChar = input[charOff + 1];
113:                        if (lowChar < 0xdc00 || lowChar > 0xdfff) {
114:                            badInputLength = 1;
115:                            throw new MalformedInputException();
116:                        }
117:                        int ucs4 = (inputChar - 0xd800) * 0x400
118:                                + (lowChar - 0xdc00) + 0x10000;
119:                        outputByte[0] = (byte) (0xf0 | ((ucs4 >> 18)) & 0x07);
120:                        outputByte[1] = (byte) (0x80 | ((ucs4 >> 12) & 0x3f));
121:                        outputByte[2] = (byte) (0x80 | ((ucs4 >> 6) & 0x3f));
122:                        outputByte[3] = (byte) (0x80 | (ucs4 & 0x3f));
123:                        outputSize = 4;
124:                        inputSize = 2;
125:                    } else {
126:                        outputByte[0] = (byte) (0xe0 | ((inputChar >> 12)) & 0x0f);
127:                        outputByte[1] = (byte) (0x80 | ((inputChar >> 6) & 0x3f));
128:                        outputByte[2] = (byte) (0x80 | (inputChar & 0x3f));
129:                        inputSize = 1;
130:                        outputSize = 3;
131:                    }
132:                    if (byteOff + outputSize > outEnd) {
133:                        throw new ConversionBufferFullException();
134:                    }
135:                    for (int i = 0; i < outputSize; i++) {
136:                        output[byteOff++] = outputByte[i];
137:                    }
138:                    charOff += inputSize;
139:                }
140:                return byteOff - outOff;
141:            }
142:
143:            public boolean canConvert(char ch) {
144:                return true;
145:            }
146:
147:            public int getMaxBytesPerChar() {
148:                return 3;
149:            }
150:
151:            public void reset() {
152:                byteOff = charOff = 0;
153:                highHalfZoneCode = 0;
154:            }
155:
156:            public String getCharacterEncoding() {
157:                return "UTF8";
158:            }
159:        }
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