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/*
* Copyright 1997 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package sun.io;
import sun.nio.cs.ext.DoubleByte;
import static sun.nio.cs.CharsetMapping.*;
public abstract class ByteToCharEUC2 extends ByteToCharConverter
{
private final int G0 = 0;
private final int G1 = 1;
private final int SS2 = 0x8E;
private final int SS3 = 0x8F;
private int firstByte, state;
private DoubleByte.Decoder dec;
public ByteToCharEUC2(DoubleByte.Decoder dec) {
super();
state = G0;
this.dec = dec;
}
char decodeSingle(int b) {
return dec.decodeSingle(b);
}
char decodeDouble(int b1, int b2) {
return dec.decodeDouble(b1, b2);
}
/**
* flush out any residual data and reset the buffer state
*/
public int flush(char[] output, int outStart, int outEnd)
throws MalformedInputException
{
if (state != G0) {
reset();
badInputLength = 0;
throw new MalformedInputException();
}
reset();
return 0;
}
/**
* Resets the converter.
*/
public void reset() {
state = G0;
charOff = byteOff = 0;
}
/**
* Character conversion
*/
public int convert(byte[] input, int inOff, int inEnd,
char[] output, int outOff, int outEnd)
throws UnknownCharacterException, MalformedInputException,
ConversionBufferFullException
{
int byte1;
char outputChar = UNMAPPABLE_DECODING;
byteOff = inOff;
charOff = outOff;
while (byteOff < inEnd) {
byte1 = input[byteOff] & 0xff;
switch (state) {
case G0:
if (byte1 == SS2 || // no general support
byte1 == SS3 ) { // for g2 or g3
badInputLength = 1;
throw new MalformedInputException();
}
if ( byte1 <= 0x9f ) // < 0x9f has its own table
outputChar = decodeSingle(byte1);
else
if (byte1 < 0xa1 || byte1 > 0xfe) { // byte within range?
badInputLength = 1;
throw new MalformedInputException();
} else { // G1 set first byte
firstByte = byte1;
state = G1;
}
break;
case G1:
state = G0;
if ( byte1 < 0xa1 || byte1 > 0xfe) { // valid G1 set second byte
badInputLength = 1;
throw new MalformedInputException();
}
outputChar = decodeDouble(firstByte, byte1);
break;
}
if (state == G0) {
if (outputChar == UNMAPPABLE_DECODING) {
if (subMode)
outputChar = subChars[0];
else {
badInputLength = 1;
throw new UnknownCharacterException();
}
}
if (charOff >= outEnd)
throw new ConversionBufferFullException();
output[charOff++] = outputChar;
}
byteOff++;
}
return charOff - outOff;
}
}
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