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*
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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*
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* 2 along with this work; if not, write to the Free Software Foundation,
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*
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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 Also: - CharToByteConverter
/**
* 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';
See Also: Returns: true for Devanagari and ASCII range and for the special characters
Zero Width Joiner and Zero Width Non-Joiner
/**
* @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 Also: - convert.convert
/**
* 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 Also:
/**
* @see sun.io.CharToByteConverter#flush
*/
public int flush( byte[] output, int outStart, int outEnd )
throws MalformedInputException, ConversionBufferFullException {
byteOff = charOff = 0;
return 0;
}//flush()
Returns: The character encoding as a String.
/**
* @return The character encoding as a String.
*/
public String getCharacterEncoding() {
return "ISCII91";
}//getCharacterEncoding
See Also: - getMaxBytesPerChar.getMaxBytesPerChar
/**
* @see sun.io.CharToByteConverter#getMaxBytesPerChar
*/
public int getMaxBytesPerChar() {
return 2;
}//getMaxBytesPerChar()
See Also: - reset.reset
/**
* @see sun.io.CharToByteConverter#reset
*/
public void reset() {
byteOff = charOff = 0;
}
} //end of class definition