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| 1 | /* | ||
| 2 | * Copyright (c) 1999, 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 | package sun.io; | ||
| 27 | |||
| 28 | import sun.nio.cs.ext.ISCII91; | ||
| 29 | |||
| 30 | /* | ||
| 31 | * Copyright (c) 1998 International Business Machines. | ||
| 32 | * All Rights Reserved. | ||
| 33 | * | ||
| 34 | * Author : Sunanda Bera, C. Thirumalesh | ||
| 35 | * Last Modified : 11,December,1998 | ||
| 36 | * | ||
| 37 | * Purpose : Defines class CharToByteISCII91. | ||
| 38 | * | ||
| 39 | * | ||
| 40 | * Revision History | ||
| 41 | * ======== ======= | ||
| 42 | * | ||
| 43 | * Date By Description | ||
| 44 | * ---- -- ----------- | ||
| 45 | * March 29, 1999 John Raley Removed MalformedInputException; modified substitution logic | ||
| 46 | * | ||
| 47 | */ | ||
| 48 | |||
| 49 | /** | ||
| 50 | * Converter class. Converts between ISCII91 encoding and Unicode encoding. | ||
| 51 | * ISCII91 is the character encoding as defined in Indian Standard document | ||
| 52 | * IS 13194:1991 ( Indian Script Code for Information Interchange ). | ||
| 53 | * | ||
| 54 | * @see sun.io.CharToByteConverter | ||
| 55 | */ | ||
| 56 | |||
| 57 | /* | ||
| 58 | * {jbr} I am not sure this class adheres to code converter conventions. | ||
| 59 | * Need to investigate. | ||
| 60 | * Might should recode as a subclass of CharToByteSingleByte. | ||
| 61 | */ | ||
| 62 | |||
| 63 | public class CharToByteISCII91 extends CharToByteConverter { | ||
| 64 | |||
| 65 | private static final byte NO_CHAR = (byte)255; | ||
| 66 | |||
| 67 | //private final static ISCII91 nioCoder = new ISCII91(); | ||
| 68 | private final static byte[] directMapTable = ISCII91.getEncoderMappingTable(); | ||
| 69 | |||
| 70 | private static final char NUKTA_CHAR = '\u093c'; | ||
| 71 | private static final char HALANT_CHAR = '\u094d'; | ||
| 72 | |||
| 73 | |||
| 74 | /** | ||
| 75 | * @return true for Devanagari and ASCII range and for the special characters | ||
| 76 | * Zero Width Joiner and Zero Width Non-Joiner | ||
| 77 | * @see sun.io.CharToByteConverter#canConvert | ||
| 78 | * | ||
| 79 | */ | ||
| 80 | public boolean canConvert(char ch) { | ||
| 81 | //check for Devanagari range,ZWJ,ZWNJ and ASCII range. | ||
| 82 | return ((ch >= 0x0900 && ch <= 0x097f) || (ch == 0x200d || ch == 0x200c) | ||
| 83 | || (ch >= 0x0000 && ch <= 0x007f) ); | ||
| 84 | } //canConvert() | ||
| 85 | /** | ||
| 86 | * Converts both Devanagari and ASCII range of characters. | ||
| 87 | * @see sun.io.CharToByteConverter#convert | ||
| 88 | */ | ||
| 89 | public int convert(char[] input, int inStart, int inEnd, byte[] output, int outStart, int outEnd) throws MalformedInputException, UnknownCharacterException, ConversionBufferFullException { | ||
| 90 | |||
| 91 | charOff = inStart; | ||
| 92 | byteOff = outStart; | ||
| 93 | |||
| 94 | for (;charOff < inEnd; charOff++) { | ||
| 95 | |||
| 96 | char inputChar = input[charOff]; | ||
| 97 | int index = Integer.MIN_VALUE; | ||
| 98 | boolean isSurrogatePair = false; | ||
| 99 | |||
| 100 | //check if input is in ASCII RANGE | ||
| 101 | if (inputChar >= 0x0000 && inputChar <= 0x007f) { | ||
| 102 | if (byteOff >= outEnd) { | ||
| 103 | throw new ConversionBufferFullException(); | ||
| 104 | } | ||
| 105 | output[byteOff++] = (byte) inputChar; | ||
| 106 | continue; | ||
| 107 | } | ||
| 108 | |||
| 109 | // if inputChar == ZWJ replace it with halant | ||
| 110 | // if inputChar == ZWNJ replace it with Nukta | ||
| 111 | if (inputChar == 0x200c) { | ||
| 112 | inputChar = HALANT_CHAR; | ||
| 113 | } | ||
| 114 | else if (inputChar == 0x200d) { | ||
| 115 | inputChar = NUKTA_CHAR; | ||
| 116 | } | ||
| 117 | |||
| 118 | if (inputChar >= 0x0900 && inputChar <= 0x097f) { | ||
| 119 | index = ((int)(inputChar) - 0x0900)*2; | ||
| 120 | } | ||
| 121 | |||
| 122 | // If input char is a high surrogate, ensure that the following | ||
| 123 | // char is a low surrogate. If not, throw a MalformedInputException. | ||
| 124 | // Leave index untouched so substitution or an UnknownCharacterException | ||
| 125 | // will result. | ||
| 126 | else if (inputChar >= 0xd800 && inputChar <= 0xdbff) { | ||
| 127 | if (charOff < inEnd-1) { | ||
| 128 | char nextChar = input[charOff]; | ||
| 129 | if (nextChar >= 0xdc00 && nextChar <= 0xdfff) { | ||
| 130 | charOff++; | ||
| 131 | isSurrogatePair = true; | ||
| 132 | } | ||
| 133 | } | ||
| 134 | if (!isSurrogatePair) { | ||
| 135 | badInputLength = 1; | ||
| 136 | throw new MalformedInputException(); | ||
| 137 | } | ||
| 138 | } | ||
| 139 | else if (inputChar >= 0xdc00 && inputChar <= 0xdfff) { | ||
| 140 | badInputLength = 1; | ||
| 141 | throw new MalformedInputException(); | ||
| 142 | } | ||
| 143 | |||
| 144 | if (index == Integer.MIN_VALUE || directMapTable[index] == NO_CHAR) { | ||
| 145 | if (subMode) { | ||
| 146 | if (byteOff + subBytes.length >= outEnd) { | ||
| 147 | throw new ConversionBufferFullException(); | ||
| 148 | } | ||
| 149 | System.arraycopy(subBytes, 0, output, byteOff, subBytes.length); | ||
| 150 | byteOff += subBytes.length; | ||
| 151 | } else { | ||
| 152 | badInputLength = isSurrogatePair? 2 : 1; | ||
| 153 | throw new UnknownCharacterException(); | ||
| 154 | } | ||
| 155 | } | ||
| 156 | else { | ||
| 157 | if(byteOff >= outEnd) { | ||
| 158 | throw new ConversionBufferFullException(); | ||
| 159 | } | ||
| 160 | output[byteOff++] = directMapTable[index++]; | ||
| 161 | if(directMapTable[index] != NO_CHAR) { | ||
| 162 | if(byteOff >= outEnd) { | ||
| 163 | throw new ConversionBufferFullException(); | ||
| 164 | } | ||
| 165 | output[byteOff++] = directMapTable[index]; | ||
| 166 | } | ||
| 167 | } | ||
| 168 | |||
| 169 | } //end for | ||
| 170 | |||
| 171 | return byteOff - outStart; | ||
| 172 | } //end of routine convert. | ||
| 173 | |||
| 174 | /** | ||
| 175 | * @see sun.io.CharToByteConverter#flush | ||
| 176 | */ | ||
| 177 | public int flush( byte[] output, int outStart, int outEnd ) | ||
| 178 | throws MalformedInputException, ConversionBufferFullException { | ||
| 179 | byteOff = charOff = 0; | ||
| 180 | return 0; | ||
| 181 | }//flush() | ||
| 182 | /** | ||
| 183 | * @return The character encoding as a String. | ||
| 184 | */ | ||
| 185 | public String getCharacterEncoding() { | ||
| 186 | return "ISCII91"; | ||
| 187 | }//getCharacterEncoding | ||
| 188 | /** | ||
| 189 | * @see sun.io.CharToByteConverter#getMaxBytesPerChar | ||
| 190 | */ | ||
| 191 | public int getMaxBytesPerChar() { | ||
| 192 | return 2; | ||
| 193 | }//getMaxBytesPerChar() | ||
| 194 | /** | ||
| 195 | * @see sun.io.CharToByteConverter#reset | ||
| 196 | */ | ||
| 197 | public void reset() { | ||
| 198 | byteOff = charOff = 0; | ||
| 199 | } | ||
| 200 | } //end of class definition | ||