| /* |
| * Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.io; |
| |
| import sun.nio.cs.ext.ISCII91; |
| |
| /* |
| * Copyright (c) 1998 International Business Machines. |
| * All Rights Reserved. |
| * |
| * Author : Sunanda Bera, C. Thirumalesh |
| * Last Modified : 11,December,1998 |
| * |
| * Purpose : Defines class CharToByteISCII91. |
| * |
| * |
| * Revision History |
| * ======== ======= |
| * |
| * Date By Description |
| * ---- -- ----------- |
| * March 29, 1999 John Raley Removed MalformedInputException; modified substitution logic |
| * |
| */ |
| |
| /** |
| * Converter class. Converts between ISCII91 encoding and Unicode encoding. |
| * ISCII91 is the character encoding as defined in Indian Standard document |
| * IS 13194:1991 ( Indian Script Code for Information Interchange ). |
| * |
| * @see sun.io.CharToByteConverter |
| */ |
| |
| /* |
| * {jbr} I am not sure this class adheres to code converter conventions. |
| * Need to investigate. |
| * Might should recode as a subclass of CharToByteSingleByte. |
| */ |
| |
| public class CharToByteISCII91 extends CharToByteConverter { |
| |
| private static final byte NO_CHAR = (byte)255; |
| |
| //private final static ISCII91 nioCoder = new ISCII91(); |
| private final static byte[] directMapTable = ISCII91.getEncoderMappingTable(); |
| |
| private static final char NUKTA_CHAR = '\u093c'; |
| private static final char HALANT_CHAR = '\u094d'; |
| |
| |
| /** |
| * @return true for Devanagari and ASCII range and for the special characters |
| * Zero Width Joiner and Zero Width Non-Joiner |
| * @see sun.io.CharToByteConverter#canConvert |
| * |
| */ |
| public boolean canConvert(char ch) { |
| //check for Devanagari range,ZWJ,ZWNJ and ASCII range. |
| return ((ch >= 0x0900 && ch <= 0x097f) || (ch == 0x200d || ch == 0x200c) |
| || (ch >= 0x0000 && ch <= 0x007f) ); |
| } //canConvert() |
| /** |
| * Converts both Devanagari and ASCII range of characters. |
| * @see sun.io.CharToByteConverter#convert |
| */ |
| public int convert(char[] input, int inStart, int inEnd, byte[] output, int outStart, int outEnd) throws MalformedInputException, UnknownCharacterException, ConversionBufferFullException { |
| |
| charOff = inStart; |
| byteOff = outStart; |
| |
| for (;charOff < inEnd; charOff++) { |
| |
| char inputChar = input[charOff]; |
| int index = Integer.MIN_VALUE; |
| boolean isSurrogatePair = false; |
| |
| //check if input is in ASCII RANGE |
| if (inputChar >= 0x0000 && inputChar <= 0x007f) { |
| if (byteOff >= outEnd) { |
| throw new ConversionBufferFullException(); |
| } |
| output[byteOff++] = (byte) inputChar; |
| continue; |
| } |
| |
| // if inputChar == ZWJ replace it with halant |
| // if inputChar == ZWNJ replace it with Nukta |
| if (inputChar == 0x200c) { |
| inputChar = HALANT_CHAR; |
| } |
| else if (inputChar == 0x200d) { |
| inputChar = NUKTA_CHAR; |
| } |
| |
| if (inputChar >= 0x0900 && inputChar <= 0x097f) { |
| index = ((int)(inputChar) - 0x0900)*2; |
| } |
| |
| // If input char is a high surrogate, ensure that the following |
| // char is a low surrogate. If not, throw a MalformedInputException. |
| // Leave index untouched so substitution or an UnknownCharacterException |
| // will result. |
| else if (inputChar >= 0xd800 && inputChar <= 0xdbff) { |
| if (charOff < inEnd-1) { |
| char nextChar = input[charOff]; |
| if (nextChar >= 0xdc00 && nextChar <= 0xdfff) { |
| charOff++; |
| isSurrogatePair = true; |
| } |
| } |
| if (!isSurrogatePair) { |
| badInputLength = 1; |
| throw new MalformedInputException(); |
| } |
| } |
| else if (inputChar >= 0xdc00 && inputChar <= 0xdfff) { |
| badInputLength = 1; |
| throw new MalformedInputException(); |
| } |
| |
| if (index == Integer.MIN_VALUE || directMapTable[index] == NO_CHAR) { |
| if (subMode) { |
| if (byteOff + subBytes.length >= outEnd) { |
| throw new ConversionBufferFullException(); |
| } |
| System.arraycopy(subBytes, 0, output, byteOff, subBytes.length); |
| byteOff += subBytes.length; |
| } else { |
| badInputLength = isSurrogatePair? 2 : 1; |
| throw new UnknownCharacterException(); |
| } |
| } |
| else { |
| if(byteOff >= outEnd) { |
| throw new ConversionBufferFullException(); |
| } |
| output[byteOff++] = directMapTable[index++]; |
| if(directMapTable[index] != NO_CHAR) { |
| if(byteOff >= outEnd) { |
| throw new ConversionBufferFullException(); |
| } |
| output[byteOff++] = directMapTable[index]; |
| } |
| } |
| |
| } //end for |
| |
| return byteOff - outStart; |
| } //end of routine convert. |
| |
| /** |
| * @see sun.io.CharToByteConverter#flush |
| */ |
| public int flush( byte[] output, int outStart, int outEnd ) |
| throws MalformedInputException, ConversionBufferFullException { |
| byteOff = charOff = 0; |
| return 0; |
| }//flush() |
| /** |
| * @return The character encoding as a String. |
| */ |
| public String getCharacterEncoding() { |
| return "ISCII91"; |
| }//getCharacterEncoding |
| /** |
| * @see sun.io.CharToByteConverter#getMaxBytesPerChar |
| */ |
| public int getMaxBytesPerChar() { |
| return 2; |
| }//getMaxBytesPerChar() |
| /** |
| * @see sun.io.CharToByteConverter#reset |
| */ |
| public void reset() { |
| byteOff = charOff = 0; |
| } |
| } //end of class definition |