jdk/src/share/classes/sun/io/ByteToCharCp964.java
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/*
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 * Copyright (c) 1997, 2003, 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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import sun.nio.cs.ext.IBM964;
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/**
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* @author Malcolm Ayres
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*/
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public class ByteToCharCp964 extends ByteToCharConverter
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{
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    private final static IBM964 nioCoder = new IBM964();
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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 G2 = 2;
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    private final int G3 = 3;
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    private final int G4 = 4;
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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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    private String byteToCharTable;
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    private String mappingTableG1;
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    private String mappingTableG2;
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    private String mappingTableG2a2;
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    private String mappingTableG2ac;
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    private String mappingTableG2ad;
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    public ByteToCharCp964() {
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       super();
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       state = G0;
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       byteToCharTable = nioCoder.getDecoderSingleByteMappings();
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       mappingTableG1 = nioCoder.getDecoderMappingTableG1();
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       mappingTableG2a2 = nioCoder.getDecoderMappingTableG2a2();
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       mappingTableG2ac = nioCoder.getDecoderMappingTableG2ac();
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       mappingTableG2ad = nioCoder.getDecoderMappingTableG2ad();
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    }
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    /**
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      * Return the character set id
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      */
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    public String getCharacterEncoding()
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    {
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       return "Cp964";
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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)
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                   state = G2;
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                else if (byte1 == SS3) {
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                   badInputLength = 1;
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                   throw new MalformedInputException();
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                }
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                else if ( byte1 <= 0x9f )               // valid single byte
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                   outputChar = byteToCharTable.charAt(byte1);
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                else if (byte1 < 0xa1 || byte1 > 0xfe) {
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                   badInputLength = 1;
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                   throw new MalformedInputException();
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                } else {                                // valid 1st byte for G1
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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 second byte for G1
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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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             case G2:
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                // set the correct mapping table for supported G2 sets
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                if ( byte1 == 0xa2)
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                  mappingTableG2 = mappingTableG2a2;
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                else
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                if ( byte1 == 0xac)
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                  mappingTableG2 = mappingTableG2ac;
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                else
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                if ( byte1 == 0xad)
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                  mappingTableG2 = mappingTableG2ad;
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                else {
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                   state = G0;
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                   badInputLength = 1;
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                   throw new MalformedInputException();
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                }
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                state = G3;
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                break;
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             case G3:
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                if ( byte1 < 0xa1 || byte1 > 0xfe) {  // valid 1st byte for G2 set
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                   state = G0;
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                   badInputLength = 1;
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                   throw new MalformedInputException();
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                }
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                firstByte = byte1;
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                state = G4;
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                break;
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             case G4:
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                state = G0;
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                if ( byte1 < 0xa1 || byte1 > 0xfe) { // valid 2nd byte for G2 set
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                   badInputLength = 1;
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                   throw new MalformedInputException();
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                }
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                outputChar = mappingTableG2.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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}