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package sun.io;
Class for converting characters to bytes for the EUC-JP encoding in
linux. This converter supports the JIS0201 and the JIS0208 encoding and
omits support for the JIS212 encoding.
Author: Naveen Sanjeeva
/**
* Class for converting characters to bytes for the EUC-JP encoding in
* linux. This converter supports the JIS0201 and the JIS0208 encoding and
* omits support for the JIS212 encoding.
*
* @author Naveen Sanjeeva
*/
public class CharToByteEUC_JP_LINUX extends CharToByteJIS0208 {
CharToByteJIS0201 cbJIS0201 = new CharToByteJIS0201();
public String getCharacterEncoding() {
return "EUC_JP_LINUX";
}
protected int convSingleByte(char inputChar, byte[] outputByte) {
byte b;
if (inputChar == 0) {
outputByte[0] = (byte)0;
return 1;
}
if ((b = cbJIS0201.getNative(inputChar)) == 0)
return 0;
if (b > 0 && b < 128) {
outputByte[0] = b;
return 1;
}
outputByte[0] = (byte)0x8E;
outputByte[1] = b;
return 2;
}
protected int getNative(char ch) {
int offset = index1[((ch & 0xff00) >> 8 )] << 8;
int r = index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff));
if (r != 0)
return r + 0x8080;
return r;
}
Converts characters to sequences of bytes.
Conversions that result in Exceptions can be restarted by calling
convert again, with appropriately modified parameters.
Params: - input – char array containing text in Unicode
- inStart – offset in input array
- inEnd – offset of last byte to be converted
- output – byte array to receive conversion result
- outStart – starting offset
- outEnd – offset of last byte to be written to
Returns: the characters written to output. @throw UnsupportedCharacterException for any character
that cannot be converted to the external character set.
/**
* Converts characters to sequences of bytes.
* Conversions that result in Exceptions can be restarted by calling
* convert again, with appropriately modified parameters.
* @return the characters written to output.
* @param input char array containing text in Unicode
* @param inStart offset in input array
* @param inEnd offset of last byte to be converted
* @param output byte array to receive conversion result
* @param outStart starting offset
* @param outEnd offset of last byte to be written to
* @throw UnsupportedCharacterException for any character
* that cannot be converted to the external character set.
*/
public int convert(char[] input, int inOff, int inEnd,
byte[] output, int outOff, int outEnd)
throws MalformedInputException, UnknownCharacterException,
ConversionBufferFullException
{
char inputChar; // Input character to be converted
byte[] outputByte; // Output byte written to output
int inputSize = 0; // Size of input
int outputSize = 0; // Size of output
byte[] tmpbuf = new byte[4];
// Record beginning offsets
charOff = inOff;
byteOff = outOff;
if (highHalfZoneCode != 0) {
inputChar = highHalfZoneCode;
highHalfZoneCode = 0;
if (input[inOff] >= 0xdc00 && input[inOff] <= 0xdfff) {
// This is legal UTF16 sequence.
badInputLength = 1;
throw new UnknownCharacterException();
} else {
// This is illegal UTF16 sequence.
badInputLength = 0;
throw new MalformedInputException();
}
}
// Loop until we hit the end of the input
while(charOff < inEnd) {
inputSize = 1;
outputByte = tmpbuf;
inputChar = input[charOff]; // Get the input character
// Is this a high surrogate?
if(inputChar >= '\uD800' && inputChar <= '\uDBFF') {
// Is this the last character of the input?
if (charOff + 1 >= inEnd) {
highHalfZoneCode = inputChar;
break;
}
// Is there a low surrogate following?
inputChar = input[charOff + 1];
if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') {
// We have a valid surrogate pair. Too bad we don't do
// surrogates. Is substitution enabled?
if (subMode) {
outputByte = subBytes;
outputSize = subBytes.length;
inputSize = 2;
} else {
badInputLength = 2;
throw new UnknownCharacterException();
}
} else {
// We have a malformed surrogate pair
badInputLength = 1;
throw new MalformedInputException();
}
}
// Is this an unaccompanied low surrogate?
else if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') {
badInputLength = 1;
throw new MalformedInputException();
} else {
outputSize = convSingleByte(inputChar, outputByte);
if (outputSize == 0) { // DoubleByte
int ncode = getNative(inputChar);
if (ncode != 0 && ((ncode & 0xFF0000) == 0)) {
outputByte[0] = (byte) ((ncode & 0xff00) >> 8);
outputByte[1] = (byte) (ncode & 0xff);
outputSize = 2;
} else {
if (subMode) {
outputByte = subBytes;
outputSize = subBytes.length;
} else {
badInputLength = 1;
throw new UnknownCharacterException();
}
}
}
}
// If we don't have room for the output, throw an exception
if (byteOff + outputSize > outEnd)
throw new ConversionBufferFullException();
// Put the byte in the output buffer
for (int i = 0; i < outputSize; i++) {
output[byteOff++] = outputByte[i];
}
charOff += inputSize;
}
// Return the length written to the output buffer
return byteOff - outOff;
}
the maximum number of bytes needed to hold a converted char
@returns the maximum number of bytes needed for a converted char
/**
* the maximum number of bytes needed to hold a converted char
* @returns the maximum number of bytes needed for a converted char
*/
public int getMaxBytesPerChar() {
return 2;
}
}