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 import sun.nio.cs.ext.DoubleByte;

    28 import static sun.nio.cs.CharsetMapping.*;

    29 

    30 public abstract class ByteToCharEUC2 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     private DoubleByte.Decoder dec;

    40 

    41     public ByteToCharEUC2(DoubleByte.Decoder dec) {

    42         super();

    43         state = G0;

    44         this.dec = dec;

    45     }

    46 

    47     char decodeSingle(int b) {

    48         return dec.decodeSingle(b);

    49     }

    50 

    51     char decodeDouble(int b1, int b2) {

    52         return dec.decodeDouble(b1, b2);

    53     }

    54 

    55     /**

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

    57       */

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

    59        throws MalformedInputException

    60     {

    61        if (state != G0) {

    62           reset();

    63           badInputLength = 0;

    64           throw new MalformedInputException();

    65        }

    66 

    67        reset();

    68        return 0;

    69     }

    70 

    71     /**

    72      *  Resets the converter.

    73      */

    74     public void reset() {

    75        state = G0;

    76        charOff = byteOff = 0;

    77     }

    78 

    79     /**

    80      * Character conversion

    81      */

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

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

    84         throws UnknownCharacterException, MalformedInputException,

    85                ConversionBufferFullException

    86     {

    87         int       byte1;

    88         char      outputChar = UNMAPPABLE_DECODING;

    89         byteOff = inOff;

    90         charOff = outOff;

    91 

    92         while (byteOff < inEnd) {

    93             byte1 = input[byteOff] & 0xff;

    94             switch (state) {

    95             case G0:

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

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

    98                     badInputLength = 1;

    99                     throw new MalformedInputException();

   100                 }

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

   102                     outputChar = decodeSingle(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             case G1:

   113                 state = G0;

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

   115                     badInputLength = 1;

   116                     throw new MalformedInputException();

   117                 }

   118                 outputChar = decodeDouble(firstByte, byte1);

   119                 break;

   120             }

   121             if (state == G0) {

   122                 if (outputChar == UNMAPPABLE_DECODING) {

   123                     if (subMode)

   124                         outputChar = subChars[0];

   125                     else {

   126                         badInputLength = 1;

   127                         throw new UnknownCharacterException();

   128                     }

   129                 }

   130                 if (charOff >= outEnd)

   131                     throw new ConversionBufferFullException();

   132                 output[charOff++] = outputChar;

   133             }

   134             byteOff++;

   135          }

   136          return charOff - outOff;

   137     }

   138 }