/*
* Copyright (c) 1997, 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;
/**
* @author Malcolm Ayres
*/
public abstract class ByteToCharEUC 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;
protected String mappingTableG1;
protected String byteToCharTable;
public ByteToCharEUC() {
super();
state = G0;
}
/**
* 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 = '\uFFFD';
byteOff = inOff;
charOff = outOff;
while (byteOff < inEnd) {
byte1 = input[byteOff];
if (byte1 < 0)
byte1 += 256;
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 = byteToCharTable.charAt(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 = mappingTableG1.charAt(((firstByte - 0xa1) * 94) + byte1 - 0xa1);
break;
}
if (state == G0) {
if (outputChar == '\uFFFD') {
if (subMode)
outputChar = subChars[0];
else {
badInputLength = 1;
throw new UnknownCharacterException();
}
}
if (charOff >= outEnd)
throw new ConversionBufferFullException();
output[charOff++] = outputChar;
}
byteOff++;
}
return charOff - outOff;
}
}