1 /*

     2  * Copyright (c) 1996, 1999, 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 /**

    29  * @author Limin Shi

    30  */

    31 

    32 public class CharToByteEUC_JP extends CharToByteJIS0208 {

    33     CharToByteJIS0201 cbJIS0201 = new CharToByteJIS0201();

    34     CharToByteJIS0212 cbJIS0212 = new CharToByteJIS0212();

    35 

    36     public String getCharacterEncoding() {

    37         return "EUC_JP";

    38     }

    39 

    40     protected int convSingleByte(char inputChar, byte[] outputByte) {

    41         byte b;

    42 

    43         if (inputChar == 0) {

    44             outputByte[0] = (byte)0;

    45             return 1;

    46         }

    47 

    48         if ((b = cbJIS0201.getNative(inputChar)) == 0)

    49             return 0;

    50 

    51         if (b > 0 && b < 128) {

    52             outputByte[0] = b;

    53             return 1;

    54         }

    55         outputByte[0] = (byte)0x8E;

    56         outputByte[1] = b;

    57         return 2;

    58     }

    59 

    60     protected int getNative(char ch) {

    61         int offset = index1[((ch & 0xff00) >> 8 )] << 8;

    62         int r = index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff));

    63         if (r != 0)

    64             return r + 0x8080;

    65         r = cbJIS0212.getNative(ch);

    66         if (r == 0)

    67             return r;

    68         return r + 0x8F8080;

    69     }

    70 

    71 

    72     /**

    73      * Converts characters to sequences of bytes.

    74      * Conversions that result in Exceptions can be restarted by calling

    75      * convert again, with appropriately modified parameters.

    76      * @return the characters written to output.

    77      * @param input char array containing text in Unicode

    78      * @param inStart offset in input array

    79      * @param inEnd offset of last byte to be converted

    80      * @param output byte array to receive conversion result

    81      * @param outStart starting offset

    82      * @param outEnd offset of last byte to be written to

    83      * @throw UnsupportedCharacterException for any character

    84      * that cannot be converted to the external character set.

    85      */

    86     public int convert(char[] input, int inOff, int inEnd,

    87                        byte[] output, int outOff, int outEnd)

    88         throws MalformedInputException, UnknownCharacterException,

    89                ConversionBufferFullException

    90     {

    91         char    inputChar;                 // Input character to be converted

    92         byte[]  outputByte;                // Output byte written to output

    93         int     inputSize = 0;             // Size of input

    94         int     outputSize = 0;            // Size of output

    95         byte[]  tmpbuf = new byte[4];

    96 

    97         // Record beginning offsets

    98         charOff = inOff;

    99         byteOff = outOff;

   100 

   101         if (highHalfZoneCode != 0) {

   102             inputChar = highHalfZoneCode;

   103             highHalfZoneCode = 0;

   104             if (input[inOff] >= 0xdc00 && input[inOff] <= 0xdfff) {

   105                 // This is legal UTF16 sequence.

   106                 badInputLength = 1;

   107                 throw new UnknownCharacterException();

   108             } else {

   109                 // This is illegal UTF16 sequence.

   110                 badInputLength = 0;

   111                 throw new MalformedInputException();

   112             }

   113         }

   114 

   115         // Loop until we hit the end of the input

   116         while(charOff < inEnd) {

   117             inputSize = 1;

   118             outputByte = tmpbuf;

   119             inputChar = input[charOff]; // Get the input character

   120 

   121             // Is this a high surrogate?

   122             if(inputChar >= '\uD800' && inputChar <= '\uDBFF') {

   123                 // Is this the last character of the input?

   124                 if (charOff + 1 >= inEnd) {

   125                     highHalfZoneCode = inputChar;

   126                     break;

   127                 }

   128 

   129                 // Is there a low surrogate following?

   130                 inputChar = input[charOff + 1];

   131                 if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') {

   132                     // We have a valid surrogate pair.  Too bad we don't do

   133                     // surrogates.  Is substitution enabled?

   134                     if (subMode) {

   135                         outputByte = subBytes;

   136                         outputSize = subBytes.length;

   137                         inputSize = 2;

   138                     } else {

   139                         badInputLength = 2;

   140                         throw new UnknownCharacterException();

   141                     }

   142                 } else {

   143                     // We have a malformed surrogate pair

   144                     badInputLength = 1;

   145                     throw new MalformedInputException();

   146                 }

   147             }

   148             // Is this an unaccompanied low surrogate?

   149             else if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') {

   150                 badInputLength = 1;

   151                 throw new MalformedInputException();

   152             } else {

   153                 outputSize = convSingleByte(inputChar, outputByte);

   154                 if (outputSize == 0) { // DoubleByte

   155                     int ncode = getNative(inputChar);

   156                     if (ncode != 0 ) {

   157                         if ((ncode & 0xFF0000) == 0) {

   158                             outputByte[0] = (byte) ((ncode & 0xff00) >> 8);

   159                             outputByte[1] = (byte) (ncode & 0xff);

   160                             outputSize = 2;

   161                         } else {

   162                             outputByte[0] = (byte) 0x8F;

   163                             outputByte[1] = (byte) ((ncode & 0xff00) >> 8);

   164                             outputByte[2] = (byte) (ncode & 0xff);

   165                             outputSize = 3;

   166                         }

   167                     } else {

   168                         if (subMode) {

   169                             outputByte = subBytes;

   170                             outputSize = subBytes.length;

   171                         } else {

   172                             badInputLength = 1;

   173                             throw new UnknownCharacterException();

   174                         }

   175                     }

   176                 }

   177             }

   178 

   179             // If we don't have room for the output, throw an exception

   180             if (byteOff + outputSize > outEnd)

   181                 throw new ConversionBufferFullException();

   182 

   183             // Put the byte in the output buffer

   184             for (int i = 0; i < outputSize; i++) {

   185                 output[byteOff++] = outputByte[i];

   186             }

   187             charOff += inputSize;

   188         }

   189         // Return the length written to the output buffer

   190         return byteOff - outOff;

   191     }

   192 

   193 

   194     /**

   195      * the maximum number of bytes needed to hold a converted char

   196      * @returns the maximum number of bytes needed for a converted char

   197      */

   198     public int getMaxBytesPerChar() {

   199         return 3;

   200     }

   201 }