Source Code Cross Referenced for CharToByteEUC_JP_LINUX.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 2000 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:        /**
029:         * Class for converting characters to bytes for the EUC-JP encoding in
030:         * linux. This converter supports the JIS0201 and the JIS0208 encoding and
031:         * omits support for the JIS212 encoding.
032:         * 
033:         * @author Naveen Sanjeeva
034:         */
035:
036:        public class CharToByteEUC_JP_LINUX extends CharToByteJIS0208 {
037:            CharToByteJIS0201 cbJIS0201 = new CharToByteJIS0201();
038:
039:            public String getCharacterEncoding() {
040:                return "EUC_JP_LINUX";
041:            }
042:
043:            protected int convSingleByte(char inputChar, byte[] outputByte) {
044:                byte b;
045:
046:                if (inputChar == 0) {
047:                    outputByte[0] = (byte) 0;
048:                    return 1;
049:                }
050:
051:                if ((b = cbJIS0201.getNative(inputChar)) == 0)
052:                    return 0;
053:
054:                if (b > 0 && b < 128) {
055:                    outputByte[0] = b;
056:                    return 1;
057:                }
058:                outputByte[0] = (byte) 0x8E;
059:                outputByte[1] = b;
060:                return 2;
061:            }
062:
063:            protected int getNative(char ch) {
064:                int offset = index1[((ch & 0xff00) >> 8)] << 8;
065:                int r = index2[offset >> 12].charAt((offset & 0xfff)
066:                        + (ch & 0xff));
067:                if (r != 0)
068:                    return r + 0x8080;
069:                return r;
070:            }
071:
072:            /**
073:             * Converts characters to sequences of bytes.
074:             * Conversions that result in Exceptions can be restarted by calling
075:             * convert again, with appropriately modified parameters.
076:             * @return the characters written to output.
077:             * @param input char array containing text in Unicode
078:             * @param inStart offset in input array
079:             * @param inEnd offset of last byte to be converted
080:             * @param output byte array to receive conversion result
081:             * @param outStart starting offset
082:             * @param outEnd offset of last byte to be written to
083:             * @throw UnsupportedCharacterException for any character 
084:             * that cannot be converted to the external character set.
085:             */
086:            public int convert(char[] input, int inOff, int inEnd,
087:                    byte[] output, int outOff, int outEnd)
088:                    throws MalformedInputException, UnknownCharacterException,
089:                    ConversionBufferFullException {
090:                char inputChar; // Input character to be converted
091:                byte[] outputByte; // Output byte written to output
092:                int inputSize = 0; // Size of input
093:                int outputSize = 0; // Size of output
094:                byte[] tmpbuf = new byte[4];
095:
096:                // Record beginning offsets
097:                charOff = inOff;
098:                byteOff = outOff;
099:
100:                if (highHalfZoneCode != 0) {
101:                    inputChar = highHalfZoneCode;
102:                    highHalfZoneCode = 0;
103:                    if (input[inOff] >= 0xdc00 && input[inOff] <= 0xdfff) {
104:                        // This is legal UTF16 sequence.
105:                        badInputLength = 1;
106:                        throw new UnknownCharacterException();
107:                    } else {
108:                        // This is illegal UTF16 sequence.
109:                        badInputLength = 0;
110:                        throw new MalformedInputException();
111:                    }
112:                }
113:
114:                // Loop until we hit the end of the input
115:                while (charOff < inEnd) {
116:                    inputSize = 1;
117:                    outputByte = tmpbuf;
118:                    inputChar = input[charOff]; // Get the input character
119:
120:                    // Is this a high surrogate?
121:                    if (inputChar >= '\uD800' && inputChar <= '\uDBFF') {
122:                        // Is this the last character of the input?
123:                        if (charOff + 1 >= inEnd) {
124:                            highHalfZoneCode = inputChar;
125:                            break;
126:                        }
127:
128:                        // Is there a low surrogate following?
129:                        inputChar = input[charOff + 1];
130:                        if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') {
131:                            // We have a valid surrogate pair.  Too bad we don't do
132:                            // surrogates.  Is substitution enabled?
133:                            if (subMode) {
134:                                outputByte = subBytes;
135:                                outputSize = subBytes.length;
136:                                inputSize = 2;
137:                            } else {
138:                                badInputLength = 2;
139:                                throw new UnknownCharacterException();
140:                            }
141:                        } else {
142:                            // We have a malformed surrogate pair
143:                            badInputLength = 1;
144:                            throw new MalformedInputException();
145:                        }
146:                    }
147:                    // Is this an unaccompanied low surrogate?
148:                    else if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') {
149:                        badInputLength = 1;
150:                        throw new MalformedInputException();
151:                    } else {
152:                        outputSize = convSingleByte(inputChar, outputByte);
153:                        if (outputSize == 0) { // DoubleByte
154:                            int ncode = getNative(inputChar);
155:                            if (ncode != 0 && ((ncode & 0xFF0000) == 0)) {
156:                                outputByte[0] = (byte) ((ncode & 0xff00) >> 8);
157:                                outputByte[1] = (byte) (ncode & 0xff);
158:                                outputSize = 2;
159:                            } else {
160:                                if (subMode) {
161:                                    outputByte = subBytes;
162:                                    outputSize = subBytes.length;
163:                                } else {
164:                                    badInputLength = 1;
165:                                    throw new UnknownCharacterException();
166:                                }
167:                            }
168:                        }
169:                    }
170:
171:                    // If we don't have room for the output, throw an exception
172:                    if (byteOff + outputSize > outEnd)
173:                        throw new ConversionBufferFullException();
174:
175:                    // Put the byte in the output buffer
176:                    for (int i = 0; i < outputSize; i++) {
177:                        output[byteOff++] = outputByte[i];
178:                    }
179:                    charOff += inputSize;
180:                }
181:                // Return the length written to the output buffer
182:                return byteOff - outOff;
183:            }
184:
185:            /**
186:             * the maximum number of bytes needed to hold a converted char
187:             * @returns the maximum number of bytes needed for a converted char
188:             */
189:            public int getMaxBytesPerChar() {
190:                return 2;
191:            }
192:        }
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