1 /*

     2  * Copyright (c) 2000, 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  * Class for converting characters to bytes for the EUC-JP encoding in

    30  * linux. This converter supports the JIS0201 and the JIS0208 encoding and

    31  * omits support for the JIS212 encoding.

    32  *

    33  * @author Naveen Sanjeeva

    34  */

    35 

    36 public class CharToByteEUC_JP_LINUX extends CharToByteJIS0208 {

    37     CharToByteJIS0201 cbJIS0201 = new CharToByteJIS0201();

    38 

    39     public String getCharacterEncoding() {

    40         return "EUC_JP_LINUX";

    41     }

    42 

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

    44         byte b;

    45 

    46         if (inputChar == 0) {

    47             outputByte[0] = (byte)0;

    48             return 1;

    49         }

    50 

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

    52             return 0;

    53 

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

    55             outputByte[0] = b;

    56             return 1;

    57         }

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

    59         outputByte[1] = b;

    60         return 2;

    61     }

    62 

    63     protected int getNative(char ch) {

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

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

    66         if (r != 0)

    67             return r + 0x8080;

    68         return r;

    69     }

    70 

    71     /**

    72      * Converts characters to sequences of bytes.

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

    74      * convert again, with appropriately modified parameters.

    75      * @return the characters written to output.

    76      * @param input char array containing text in Unicode

    77      * @param inStart offset in input array

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

    79      * @param output byte array to receive conversion result

    80      * @param outStart starting offset

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

    82      * @throw UnsupportedCharacterException for any character

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

    84      */

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

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

    87         throws MalformedInputException, UnknownCharacterException,

    88                ConversionBufferFullException

    89     {

    90         char    inputChar;                 // Input character to be converted

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

    92         int     inputSize = 0;             // Size of input

    93         int     outputSize = 0;            // Size of output

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

    95 

    96         // Record beginning offsets

    97         charOff = inOff;

    98         byteOff = outOff;

    99 

   100         if (highHalfZoneCode != 0) {

   101             inputChar = highHalfZoneCode;

   102             highHalfZoneCode = 0;

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

   104                 // This is legal UTF16 sequence.

   105                 badInputLength = 1;

   106                 throw new UnknownCharacterException();

   107             } else {

   108                 // This is illegal UTF16 sequence.

   109                 badInputLength = 0;

   110                 throw new MalformedInputException();

   111             }

   112         }

   113 

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

   115         while(charOff < inEnd) {

   116             inputSize = 1;

   117             outputByte = tmpbuf;

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

   119 

   120             // Is this a high surrogate?

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

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

   123                 if (charOff + 1 >= inEnd) {

   124                     highHalfZoneCode = inputChar;

   125                     break;

   126                 }

   127 

   128                 // Is there a low surrogate following?

   129                 inputChar = input[charOff + 1];

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

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

   132                     // surrogates.  Is substitution enabled?

   133                     if (subMode) {

   134                         outputByte = subBytes;

   135                         outputSize = subBytes.length;

   136                         inputSize = 2;

   137                     } else {

   138                         badInputLength = 2;

   139                         throw new UnknownCharacterException();

   140                     }

   141                 } else {

   142                     // We have a malformed surrogate pair

   143                     badInputLength = 1;

   144                     throw new MalformedInputException();

   145                 }

   146             }

   147             // Is this an unaccompanied low surrogate?

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

   149                 badInputLength = 1;

   150                 throw new MalformedInputException();

   151             } else {

   152                 outputSize = convSingleByte(inputChar, outputByte);

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

   154                     int ncode = getNative(inputChar);

   155                     if (ncode != 0 && ((ncode & 0xFF0000) == 0)) {

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

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

   158                             outputSize = 2;

   159                     } else {

   160                         if (subMode) {

   161                             outputByte = subBytes;

   162                             outputSize = subBytes.length;

   163                         } else {

   164                             badInputLength = 1;

   165                             throw new UnknownCharacterException();

   166                         }

   167                     }

   168                 }

   169             }

   170 

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

   172             if (byteOff + outputSize > outEnd)

   173                 throw new ConversionBufferFullException();

   174 

   175             // Put the byte in the output buffer

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

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

   178             }

   179             charOff += inputSize;

   180         }

   181         // Return the length written to the output buffer

   182         return byteOff - outOff;

   183     }

   184 

   185 

   186     /**

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

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

   189      */

   190     public int getMaxBytesPerChar() {

   191         return 2;

   192     }

   193 }