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.IBM33722;

    28 

    29 /**

    30 * @author Malcolm Ayres

    31 */

    32 public class ByteToCharCp33722 extends ByteToCharConverter

    33 {

    34     private final int G0 = 0;

    35     private final int G1 = 1;

    36     private final int G2 = 2;

    37     private final int G3 = 3;

    38     private final int G4 = 4;

    39     private final int SS2 =  0x8E;

    40     private final int SS3 =  0x8F;

    41 

    42     private int firstByte, state;

    43     private String byteToCharTable;

    44     private String mappingTableG1;

    45     private String mappingTableG2;

    46     private String mappingTableG3;

    47 

    48     private final static IBM33722 nioCoder = new IBM33722();

    49 

    50     public ByteToCharCp33722() {

    51         super();

    52         state = G0;

    53         byteToCharTable = nioCoder.getDecoderSingleByteMappings();

    54         mappingTableG1 = nioCoder.getDecoderMappingTableG1();

    55         mappingTableG2 = nioCoder.getDecoderMappingTableG2();

    56         mappingTableG3 = nioCoder.getDecoderMappingTableG3();

    57     }

    58 

    59     /**

    60       * Return the character set id

    61       */

    62     public String getCharacterEncoding()

    63     {

    64        return "Cp33722";

    65     }

    66 

    67     /**

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

    69       */

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

    71        throws MalformedInputException

    72     {

    73         if (state != G0) {

    74             reset();

    75             badInputLength = 0;

    76             throw new MalformedInputException();

    77         }

    78 

    79         reset();

    80         return 0;

    81     }

    82 

    83     /**

    84      *  Resets the converter.

    85      */

    86     public void reset() {

    87         state = G0;

    88         charOff = byteOff = 0;

    89     }

    90 

    91     /**

    92      * Character conversion

    93      */

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

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

    96         throws UnknownCharacterException, MalformedInputException,

    97                ConversionBufferFullException

    98     {

    99 

   100        int       byte1;

   101        char      outputChar = '\uFFFD';

   102 

   103        byteOff = inOff;

   104        charOff = outOff;

   105 

   106        while (byteOff < inEnd) {

   107 

   108           byte1 = input[byteOff];

   109           if (byte1 < 0)

   110             byte1 += 256;

   111 

   112           switch (state) {

   113              case G0:

   114                 if (byte1 == SS2)                       // drop into G2 set

   115                    state = G2;

   116                 else if (byte1 == SS3)                  // drop into G3 set

   117                    state = G3;

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

   119                    outputChar = byteToCharTable.charAt(byte1);

   120                 else if (byte1 < 0xa1 || byte1 > 0xfe) {  // valid G1 set 1st byte

   121                    badInputLength = 1;

   122                    throw new MalformedInputException();

   123                 } else {

   124                    firstByte = byte1;                   // save the 1st byte

   125                    state = G1;

   126                 }

   127                 break;

   128 

   129              case G1:

   130                 state = G0;

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

   132                    badInputLength = 1;

   133                    throw new MalformedInputException();

   134                 }

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

   136                 break;

   137 

   138              case G2:

   139                 state = G0;                             // valid first byte for G2

   140                 if ( byte1 < 0xa1 || byte1 > 0xfe) {

   141                    badInputLength = 1;

   142                    throw new MalformedInputException();

   143                 }

   144                 outputChar = mappingTableG2.charAt(byte1 - 0xa1);

   145                 break;

   146 

   147              case G3:

   148                 if ( byte1 < 0xa1 || byte1 > 0xfe) {    // valid first byte for G3

   149                    state = G0;

   150                    badInputLength = 1;

   151                    throw new MalformedInputException();

   152                 }

   153                 firstByte = byte1;

   154                 state = G4;

   155                 break;

   156 

   157              case G4:

   158                 state = G0;                             // valid second byte for G3

   159                 if ( byte1 < 0xa1 || byte1 > 0xfe) {

   160                    badInputLength = 1;

   161                    throw new MalformedInputException();

   162                 }

   163                 outputChar = mappingTableG3.charAt(((firstByte - 0xa1) * 94)  + byte1 - 0xa1);

   164                 break;

   165 

   166           }

   167 

   168           if (state == G0) {

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

   170                 if (subMode)

   171                    outputChar = subChars[0];

   172                 else {

   173                    badInputLength = 1;

   174                    throw new UnknownCharacterException();

   175                 }

   176              }

   177 

   178              if (charOff >= outEnd)

   179                 throw new ConversionBufferFullException();

   180 

   181              output[charOff++] = outputChar;

   182           }

   183 

   184           byteOff++;

   185 

   186        }

   187 

   188        return charOff - outOff;

   189 

   190     }

   191 }