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/*
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* Copyright (c) 1997, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.io;
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/**
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* @author Malcolm Ayres
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*/
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public abstract class ByteToCharEUC extends ByteToCharConverter
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{
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private final int G0 = 0;
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private final int G1 = 1;
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private final int SS2 = 0x8E;
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private final int SS3 = 0x8F;
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private int firstByte, state;
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protected String mappingTableG1;
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protected String byteToCharTable;
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public ByteToCharEUC() {
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super();
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state = G0;
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}
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/**
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* flush out any residual data and reset the buffer state
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*/
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public int flush(char[] output, int outStart, int outEnd)
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throws MalformedInputException
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{
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if (state != G0) {
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reset();
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badInputLength = 0;
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throw new MalformedInputException();
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}
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reset();
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return 0;
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}
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/**
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* Resets the converter.
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*/
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public void reset() {
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state = G0;
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charOff = byteOff = 0;
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}
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/**
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* Character conversion
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*/
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public int convert(byte[] input, int inOff, int inEnd,
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char[] output, int outOff, int outEnd)
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throws UnknownCharacterException, MalformedInputException,
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ConversionBufferFullException
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{
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int byte1;
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char outputChar = '\uFFFD';
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byteOff = inOff;
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charOff = outOff;
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while (byteOff < inEnd) {
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byte1 = input[byteOff];
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if (byte1 < 0)
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byte1 += 256;
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switch (state) {
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case G0:
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if (byte1 == SS2 || // no general support
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byte1 == SS3 ) { // for g2 or g3
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badInputLength = 1;
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throw new MalformedInputException();
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}
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if ( byte1 <= 0x9f ) // < 0x9f has its own table
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outputChar = byteToCharTable.charAt(byte1);
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else
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if (byte1 < 0xa1 || byte1 > 0xfe) { // byte within range?
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badInputLength = 1;
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throw new MalformedInputException();
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} else { // G1 set first byte
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firstByte = byte1;
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state = G1;
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}
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break;
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case G1:
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state = G0;
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if ( byte1 < 0xa1 || byte1 > 0xfe) { // valid G1 set second byte
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badInputLength = 1;
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throw new MalformedInputException();
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}
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outputChar = mappingTableG1.charAt(((firstByte - 0xa1) * 94) + byte1 - 0xa1);
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break;
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}
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if (state == G0) {
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if (outputChar == '\uFFFD') {
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if (subMode)
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outputChar = subChars[0];
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else {
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badInputLength = 1;
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throw new UnknownCharacterException();
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}
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}
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if (charOff >= outEnd)
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throw new ConversionBufferFullException();
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output[charOff++] = outputChar;
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}
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byteOff++;
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}
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return charOff - outOff;
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}
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}
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