/*
* 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;
public abstract class ByteToCharDBCS_EBCDIC extends ByteToCharConverter
{
private static final int SBCS = 0;
private static final int DBCS = 1;
private static final int SO = 0x0e;
private static final int SI = 0x0f;
private int currentState;
private boolean savedBytePresent;
private byte savedByte;
protected String singleByteToChar;
protected short index1[];
protected String index2;
protected int mask1;
protected int mask2;
protected int shift;
public ByteToCharDBCS_EBCDIC() {
super();
currentState = SBCS;
savedBytePresent = false;
}
public int flush(char [] output, int outStart, int outEnd)
throws MalformedInputException
{
if (savedBytePresent) {
reset();
badInputLength = 0;
throw new MalformedInputException();
}
reset();
return 0;
}
/**
* Character conversion
*/
public int convert(byte[] input, int inOff, int inEnd,
char[] output, int outOff, int outEnd)
throws UnknownCharacterException, MalformedInputException,
ConversionBufferFullException
{
int inputSize;
char outputChar = '\uFFFD';
charOff = outOff;
byteOff = inOff;
while(byteOff < inEnd) {
int byte1, byte2;
int v;
if (!savedBytePresent) {
byte1 = input[byteOff];
inputSize = 1;
} else {
byte1 = savedByte;
savedBytePresent = false;
inputSize = 0;
}
if (byte1 == SO) {
// For SO characters - simply validate the state and if OK
// update the state and go to the next byte
if (currentState != SBCS) {
badInputLength = 1;
throw new MalformedInputException();
} else {
currentState = DBCS;
byteOff += inputSize;
}
}
else
if (byte1 == SI) {
// For SI characters - simply validate the state and if OK
// update the state and go to the next byte
if (currentState != DBCS) {
badInputLength = 1;
throw new MalformedInputException();
} else {
currentState = SBCS;
byteOff+= inputSize;
}
} else {
// Process the real data characters
if (byte1 < 0)
byte1 += 256;
if (currentState == SBCS) {
outputChar = singleByteToChar.charAt(byte1);
} else {
// for a DBCS character - architecture dictates the
// valid range of 1st bytes
if (byte1 < 0x40 || byte1 > 0xfe) {
badInputLength = 1;
throw new MalformedInputException();
}
if (byteOff + inputSize >= inEnd) {
// We have been split in the middle if a character
// save the first byte for next time around
savedByte = (byte)byte1;
savedBytePresent = true;
byteOff += inputSize;
break;
}
byte2 = input[byteOff+inputSize];
if (byte2 < 0)
byte2 += 256;
inputSize++;
// validate the pair of bytes meet the architecture
if ((byte1 != 0x40 || byte2 != 0x40) &&
(byte2 < 0x41 || byte2 > 0xfe)) {
badInputLength = 2;
throw new MalformedInputException();
}
// Lookup in the two level index
v = byte1 * 256 + byte2;
outputChar = index2.charAt(index1[((v & mask1) >> shift)] + (v & mask2));
}
if (outputChar == '\uFFFD') {
if (subMode)
outputChar = subChars[0];
else {
badInputLength = inputSize;
throw new UnknownCharacterException();
}
}
if (charOff >= outEnd)
throw new ConversionBufferFullException();
output[charOff++] = outputChar;
byteOff += inputSize;
}
}
return charOff - outOff;
}
/**
* Resets the converter.
*/
public void reset() {
charOff = byteOff = 0;
currentState = SBCS;
savedBytePresent = false;
}
}