1 /*

     2  * Copyright (c) 1996, 2004, 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 

    26 package sun.io;

    27 

    28 import sun.nio.cs.ext.EUC_TW;

    29 

    30 /*

    31  * @author Limin Shi

    32  */

    33 public class ByteToCharEUC_TW extends ByteToCharConverter

    34 {

    35     private final byte G0 = 0;

    36     private final byte G1 = 1;

    37     private final byte G2 = 2;

    38     private final byte G3 = 3;

    39     private final byte G4 = 4;

    40     private final byte MSB = (byte) 0x80;

    41     private final byte SS2 = (byte) 0x8E;

    42 

    43     private byte firstByte = 0, state = G0;

    44     private int cnsPlane = 0;

    45 

    46     private EUC_TW.Decoder dec = (EUC_TW.Decoder)(new EUC_TW().newDecoder());

    47 

    48     public ByteToCharEUC_TW() {

    49     }

    50 

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

    52         throws MalformedInputException

    53     {

    54         if (state != G0) {

    55             state = G0;

    56             firstByte = 0;

    57             badInputLength = 0;

    58             throw new MalformedInputException();

    59         }

    60         reset();

    61         return 0;

    62     }

    63 

    64     public void reset() {

    65         dec.reset();

    66         state = G0;

    67         firstByte = 0;

    68         byteOff = charOff = 0;

    69     }

    70 

    71     /**

    72      * Character conversion

    73      */

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

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

    76         throws UnknownCharacterException, MalformedInputException,

    77                ConversionBufferFullException

    78     {

    79         int inputSize = 0;

    80         char[] c1 = new char[1];

    81 

    82         byteOff = inOff;

    83         charOff = outOff;

    84 

    85         cnsPlane = 3;

    86         while (byteOff < inEnd) {

    87             if (charOff >= outEnd)

    88                 throw new ConversionBufferFullException();

    89             char[] outputChar = null;

    90             switch (state) {

    91             case G0:

    92                 if ( (input[byteOff] & MSB) == 0) {     // ASCII

    93                     outputChar = c1;

    94                     outputChar[0] = (char) input[byteOff];

    95                 } else if (input[byteOff] == SS2) {     // Codeset 2

    96                     state = G2;

    97                 } else {                                // Codeset 1

    98                     firstByte = input[byteOff];

    99                     state = G1;

   100                 }

   101                 break;

   102             case G1:

   103                 inputSize = 2;

   104                 if ( (input[byteOff] & MSB) != 0) {     // 2nd byte

   105                     cnsPlane = 0;

   106                     outputChar = dec.toUnicode(firstByte & 0xff,

   107                                                input[byteOff] & 0xff,

   108                                                cnsPlane);

   109                 } else {                                // Error

   110                     badInputLength = 1;

   111                     throw new MalformedInputException();

   112                 }

   113                 firstByte = 0;

   114                 state = G0;

   115                 break;

   116             case G2:

   117                 cnsPlane = (input[byteOff] & (byte)0x0f);

   118                 // Adjust String array index for plan 15

   119                 cnsPlane = (cnsPlane == 15)? 8 : cnsPlane;

   120 

   121                 if (cnsPlane < 15) {

   122                      state = G3;

   123                 } else {

   124                     badInputLength = 2;

   125                     throw new MalformedInputException();

   126                 }

   127 

   128                 break;

   129             case G3:

   130                 if ( (input[byteOff] & MSB) != 0) {     // 1st byte

   131                     firstByte = input[byteOff];

   132                     state = G4;

   133                 } else {                                // Error

   134                     state = G0;

   135                     badInputLength = 2;

   136                     throw new MalformedInputException();

   137                 }

   138                 break;

   139             case G4:

   140                 if ( (input[byteOff] & MSB) != 0) {     // 2nd byte

   141                     outputChar = dec.toUnicode(firstByte & 0xff,

   142                                                input[byteOff] & 0xff,

   143                                                cnsPlane - 1);

   144                 } else {                                // Error

   145                     badInputLength = 3;

   146                     throw new MalformedInputException();

   147                 }

   148                 firstByte = 0;

   149                 state = G0;

   150                 break;

   151             }

   152             byteOff++;

   153             if (state == G0) {

   154                 if (outputChar == null) {

   155                     if (subMode) {               // substitution enabled

   156                         outputChar = c1;

   157                         outputChar[0] = subChars[0];

   158                     } else {

   159                         badInputLength = inputSize;

   160                         throw new UnknownCharacterException();

   161                     }

   162                 }

   163                 output[charOff++] = outputChar[0];

   164             }

   165         }

   166         return charOff - outOff;

   167     }

   168 

   169 

   170     /**

   171      * Return the character set ID

   172      */

   173     public String getCharacterEncoding() {

   174         return "EUC_TW";

   175     }

   176 }