1 /*

     2  * Copyright (c) 1997, 2003, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 package sun.io;

    26 

    27 import sun.nio.cs.ext.IBM964;

    28 

    29 /**

    30 * @author Malcolm Ayres

    31 */

    32 public class ByteToCharCp964 extends ByteToCharConverter

    33 {

    34     private final static IBM964 nioCoder = new IBM964();

    35 

    36     private final int G0 = 0;

    37     private final int G1 = 1;

    38     private final int G2 = 2;

    39     private final int G3 = 3;

    40     private final int G4 = 4;

    41     private final int SS2 =  0x8E;

    42     private final int SS3 =  0x8F;

    43 

    44     private int firstByte, state;

    45 

    46     private String byteToCharTable;

    47     private String mappingTableG1;

    48     private String mappingTableG2;

    49     private String mappingTableG2a2;

    50     private String mappingTableG2ac;

    51     private String mappingTableG2ad;

    52 

    53 

    54     public ByteToCharCp964() {

    55        super();

    56        state = G0;

    57        byteToCharTable = nioCoder.getDecoderSingleByteMappings();

    58        mappingTableG1 = nioCoder.getDecoderMappingTableG1();

    59        mappingTableG2a2 = nioCoder.getDecoderMappingTableG2a2();

    60        mappingTableG2ac = nioCoder.getDecoderMappingTableG2ac();

    61        mappingTableG2ad = nioCoder.getDecoderMappingTableG2ad();

    62     }

    63 

    64     /**

    65       * Return the character set id

    66       */

    67     public String getCharacterEncoding()

    68     {

    69        return "Cp964";

    70     }

    71 

    72     /**

    73       * flush out any residual data and reset the buffer state

    74       */

    75     public int flush(char[] output, int outStart, int outEnd)

    76        throws MalformedInputException

    77     {

    78        if (state != G0) {

    79           reset();

    80           badInputLength = 0;

    81           throw new MalformedInputException();

    82        }

    83 

    84        reset();

    85        return 0;

    86     }

    87 

    88     /**

    89      *  Resets the converter.

    90      */

    91     public void reset() {

    92        state = G0;

    93        charOff = byteOff = 0;

    94     }

    95 

    96     /**

    97      * Character conversion

    98      */

    99     public int convert(byte[] input, int inOff, int inEnd,

   100                        char[] output, int outOff, int outEnd)

   101         throws UnknownCharacterException, MalformedInputException,

   102                ConversionBufferFullException

   103     {

   104 

   105        int       byte1;

   106        char      outputChar = '\uFFFD';

   107 

   108        byteOff = inOff;

   109        charOff = outOff;

   110 

   111        while (byteOff < inEnd) {

   112 

   113           byte1 = input[byteOff];

   114           if (byte1 < 0)

   115             byte1 += 256;

   116 

   117           switch (state) {

   118              case G0:

   119                 if (byte1 == SS2)

   120                    state = G2;

   121                 else if (byte1 == SS3) {

   122                    badInputLength = 1;

   123                    throw new MalformedInputException();

   124                 }

   125                 else if ( byte1 <= 0x9f )               // valid single byte

   126                    outputChar = byteToCharTable.charAt(byte1);

   127                 else if (byte1 < 0xa1 || byte1 > 0xfe) {

   128                    badInputLength = 1;

   129                    throw new MalformedInputException();

   130                 } else {                                // valid 1st byte for G1

   131                    firstByte = byte1;

   132                    state = G1;

   133                 }

   134                 break;

   135 

   136              case G1:

   137                 state = G0;

   138                 if ( byte1 < 0xa1 || byte1 > 0xfe) {   // valid second byte for G1

   139                    badInputLength = 1;

   140                    throw new MalformedInputException();

   141                 }

   142                 outputChar = mappingTableG1.charAt(((firstByte - 0xa1) * 94)  + byte1 - 0xa1);

   143                 break;

   144 

   145              case G2:

   146                 // set the correct mapping table for supported G2 sets

   147                 if ( byte1 == 0xa2)

   148                   mappingTableG2 = mappingTableG2a2;

   149                 else

   150                 if ( byte1 == 0xac)

   151                   mappingTableG2 = mappingTableG2ac;

   152                 else

   153                 if ( byte1 == 0xad)

   154                   mappingTableG2 = mappingTableG2ad;

   155                 else {

   156                    state = G0;

   157                    badInputLength = 1;

   158                    throw new MalformedInputException();

   159                 }

   160                 state = G3;

   161                 break;

   162 

   163              case G3:

   164                 if ( byte1 < 0xa1 || byte1 > 0xfe) {  // valid 1st byte for G2 set

   165                    state = G0;

   166                    badInputLength = 1;

   167                    throw new MalformedInputException();

   168                 }

   169                 firstByte = byte1;

   170                 state = G4;

   171                 break;

   172 

   173              case G4:

   174                 state = G0;

   175                 if ( byte1 < 0xa1 || byte1 > 0xfe) { // valid 2nd byte for G2 set

   176                    badInputLength = 1;

   177                    throw new MalformedInputException();

   178                 }

   179                 outputChar = mappingTableG2.charAt(((firstByte - 0xa1) * 94)  + byte1 - 0xa1);

   180                 break;

   181 

   182           }

   183 

   184           if (state == G0) {

   185              if (outputChar == '\uFFFD') {

   186                 if (subMode)

   187                    outputChar = subChars[0];

   188                 else {

   189                    badInputLength = 1;

   190                    throw new UnknownCharacterException();

   191                 }

   192              }

   193 

   194              if (charOff >= outEnd)

   195                 throw new ConversionBufferFullException();

   196 

   197              output[charOff++] = outputChar;

   198           }

   199 

   200           byteOff++;

   201 

   202        }

   203 

   204        return charOff - outOff;

   205 

   206     }

   207 }