/*
* 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 CharToByteEUC extends CharToByteConverter
{
private char highHalfZoneCode;
private byte[] outputByte;
protected short index1[];
protected String index2;
protected String index2a;
protected String index2b;
protected String index2c;
protected int mask1;
protected int mask2;
protected int shift;
private byte[] workByte = new byte[4];
/**
* flush out any residual data and reset the buffer state
*/
public int flush(byte [] output, int outStart, int outEnd)
throws MalformedInputException, ConversionBufferFullException
{
if (highHalfZoneCode != 0) {
reset();
badInputLength = 0;
throw new MalformedInputException();
}
reset();
return 0;
}
/**
* Character conversion
*/
public int convert(char[] input, int inOff, int inEnd,
byte[] output, int outOff, int outEnd)
throws UnknownCharacterException, MalformedInputException,
ConversionBufferFullException
{
char inputChar;
int inputSize;
byteOff = outOff;
charOff = inOff;
while(charOff < inEnd) {
outputByte = workByte;
int index;
int theBytes;
int spaceNeeded;
boolean allZeroes = true;
int i;
if (highHalfZoneCode == 0) {
inputChar = input[charOff];
inputSize = 1;
} else {
inputChar = highHalfZoneCode;
inputSize = 0;
highHalfZoneCode = 0;
}
// Is this a high surrogate?
if(inputChar >= '\ud800' && inputChar <= '\udbff') {
// Is this the last character of the input?
if (charOff + inputSize >= inEnd) {
highHalfZoneCode = inputChar;
charOff += inputSize;
break;
}
// Is there a low surrogate following?
inputChar = input[charOff + inputSize];
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;
inputSize++;
} 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 {
String theChars;
char aChar;
// We have a valid character, get the bytes for it
index = index1[((inputChar & mask1) >> shift)] + (inputChar & mask2);
if (index < 7500)
theChars = index2;
else
if (index < 15000) {
index = index - 7500;
theChars = index2a;
}
else
if (index < 22500){
index = index - 15000;
theChars = index2b;
}
else {
index = index - 22500;
theChars = index2c;
}
aChar = theChars.charAt(2*index);
outputByte[0] = (byte)((aChar & 0xff00)>>8);
outputByte[1] = (byte)(aChar & 0x00ff);
aChar = theChars.charAt(2*index + 1);
outputByte[2] = (byte)((aChar & 0xff00)>>8);
outputByte[3] = (byte)(aChar & 0x00ff);
}
// if there was no mapping - look for substitution characters
for (i = 0; i < outputByte.length; i++) {
if (outputByte[i] != 0x00) {
allZeroes = false;
break;
}
}
if (allZeroes && inputChar != '\u0000')
{
if (subMode) {
outputByte = subBytes;
} else {
badInputLength = 1;
throw new UnknownCharacterException();
}
}
int oindex = 0;
for (spaceNeeded = outputByte.length; spaceNeeded > 1; spaceNeeded--){
if (outputByte[oindex++] != 0x00 )
break;
}
if (byteOff + spaceNeeded > outEnd)
throw new ConversionBufferFullException();
for (i = outputByte.length - spaceNeeded; i < outputByte.length; i++) {
output[byteOff++] = outputByte[i];
}
charOff += inputSize;
}
return byteOff - outOff;
}
/**
* Resets converter to its initial state.
*/
public void reset() {
charOff = byteOff = 0;
highHalfZoneCode = 0;
}
/**
* Returns the maximum number of bytes needed to convert a char.
*/
public int getMaxBytesPerChar() {
return 2;
}
/**
* Returns true if the given character can be converted to the
* target character encoding.
*/
public boolean canConvert(char ch) {
int index;
String theChars;
index = index1[((ch & mask1) >> shift)] + (ch & mask2);
if (index < 7500)
theChars = index2;
else
if (index < 15000) {
index = index - 7500;
theChars = index2a;
}
else
if (index < 22500){
index = index - 15000;
theChars = index2b;
}
else {
index = index - 22500;
theChars = index2c;
}
if (theChars.charAt(2*index) != '\u0000' ||
theChars.charAt(2*index + 1) != '\u0000')
return (true);
// only return true if input char was unicode null - all others are
// undefined
return( ch == '\u0000');
}
}