1 /*

     2  * Copyright (c) 1997, 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 /**

    28 * @author Malcolm Ayres

    29 */

    30 public abstract class ByteToCharEUC extends ByteToCharConverter

    31 {

    32     private final int G0 = 0;

    33     private final int G1 = 1;

    34     private final int SS2 =  0x8E;

    35     private final int SS3 =  0x8F;

    36 

    37     private int firstByte, state;

    38 

    39     protected String  mappingTableG1;

    40     protected String  byteToCharTable;

    41 

    42 

    43     public ByteToCharEUC() {

    44         super();

    45         state = G0;

    46     }

    47 

    48     /**

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

    50       */

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

    52        throws MalformedInputException

    53     {

    54        if (state != G0) {

    55           reset();

    56           badInputLength = 0;

    57           throw new MalformedInputException();

    58        }

    59 

    60        reset();

    61        return 0;

    62     }

    63 

    64     /**

    65      *  Resets the converter.

    66      */

    67     public void reset() {

    68        state = G0;

    69        charOff = byteOff = 0;

    70     }

    71 

    72     /**

    73      * Character conversion

    74      */

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

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

    77         throws UnknownCharacterException, MalformedInputException,

    78                ConversionBufferFullException

    79     {

    80 

    81        int       byte1;

    82        char      outputChar = '\uFFFD';

    83 

    84        byteOff = inOff;

    85        charOff = outOff;

    86 

    87        while (byteOff < inEnd) {

    88 

    89           byte1 = input[byteOff];

    90           if (byte1 < 0)

    91              byte1 += 256;

    92 

    93           switch (state) {

    94              case G0:

    95                 if (byte1 == SS2 ||                // no general support

    96                     byte1 == SS3 ) {               //    for g2 or g3

    97                    badInputLength = 1;

    98                    throw new MalformedInputException();

    99                 }

   100 

   101                 if ( byte1 <= 0x9f )               // < 0x9f has its own table

   102                    outputChar = byteToCharTable.charAt(byte1);

   103                 else

   104                    if (byte1 < 0xa1 || byte1 > 0xfe) {  // byte within range?

   105                       badInputLength = 1;

   106                       throw new MalformedInputException();

   107                    } else {                       // G1 set first byte

   108                       firstByte = byte1;

   109                       state = G1;

   110                    }

   111                 break;

   112 

   113              case G1:

   114 

   115                 state = G0;

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

   117                    badInputLength = 1;

   118                    throw new MalformedInputException();

   119                 }

   120 

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

   122                 break;

   123 

   124           }

   125 

   126           if (state == G0) {

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

   128                 if (subMode)

   129                    outputChar = subChars[0];

   130                 else {

   131                    badInputLength = 1;

   132                    throw new UnknownCharacterException();

   133                 }

   134              }

   135 

   136              if (charOff >= outEnd)

   137                 throw new ConversionBufferFullException();

   138 

   139              output[charOff++] = outputChar;

   140           }

   141 

   142           byteOff++;

   143 

   144        }

   145 

   146        return charOff - outOff;

   147 

   148    }

   149 

   150 }