1 /*

     2  * Copyright (c) 1997, 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 * @author Tom Zhou

    30 */

    31 

    32 public abstract class CharToByteISO2022 extends CharToByteConverter

    33 {

    34     private final byte ISO_ESC = 0x1b;

    35     private final byte ISO_SI = 0x0f;

    36     private final byte ISO_SO = 0x0e;

    37     private final byte ISO_SS2_7 = 0x4e;

    38     private final byte ISO_SS3_7 = 0x4f;

    39     private final byte SS2 = (byte)0x8e;

    40     private final byte P2 = (byte)0xA2;

    41     private final byte P3 = (byte)0xA3;

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

    43 

    44     protected final byte maximumDesignatorLength = 4;

    45 

    46     protected String SODesignator,

    47                      SS2Designator = null,

    48                      SS3Designator = null;

    49 

    50     protected CharToByteConverter codeConverter;

    51 

    52     private boolean shiftout = false;

    53     private boolean SODesDefined = false;

    54     private boolean SS2DesDefined = false;

    55     private boolean SS3DesDefined = false;

    56 

    57     private boolean newshiftout = false;

    58     private boolean newSODesDefined = false;

    59     private boolean newSS2DesDefined = false;

    60     private boolean newSS3DesDefined = false;

    61 

    62     public int flush(byte[] output, int outStart, int outEnd)

    63         throws MalformedInputException

    64     {

    65         reset();

    66         return 0;

    67     }

    68 

    69     public void reset() {

    70         shiftout = false;

    71         SODesDefined = false;

    72         SS2DesDefined = false;

    73         SS3DesDefined = false;

    74         byteOff = charOff = 0;

    75     }

    76 

    77     public boolean canConvert(char ch)

    78     {

    79         if (ch<0x80)

    80            return true;

    81         return codeConverter.canConvert(ch);

    82     }

    83 

    84     private int unicodeToNative(char unicode, byte ebyte[])

    85     {

    86         int     index = 0;

    87         byte    tmpByte[];

    88         byte    convByte[] = new byte[codeConverter.getMaxBytesPerChar()];

    89         char    convChar[] = {unicode};

    90         int     converted;

    91 

    92         try{

    93             converted = codeConverter.convert(convChar, 0, 1, convByte, 0,

    94                                         codeConverter.getMaxBytesPerChar());

    95         } catch(Exception e) {

    96             return -1;

    97         }

    98 

    99         if (converted == 2) {

   100             if (!SODesDefined) {

   101                 newSODesDefined = true;

   102                 ebyte[0] = ISO_ESC;

   103                 tmpByte = SODesignator.getBytes();

   104                 System.arraycopy(tmpByte,0,ebyte,1,tmpByte.length);

   105                 index = tmpByte.length+1;

   106             }

   107             if (!shiftout) {

   108                 newshiftout = true;

   109                 ebyte[index++] = ISO_SO;

   110             }

   111             ebyte[index++] = (byte)(convByte[0]&0x7f);

   112             ebyte[index++] = (byte)(convByte[1]&0x7f);

   113         } else {

   114             if((convByte[0] == SS2)&&(convByte[1] == P2)) {

   115                 if (!SS2DesDefined) {

   116                     newSS2DesDefined = true;

   117                     ebyte[0] = ISO_ESC;

   118                     tmpByte = SS2Designator.getBytes();

   119                     System.arraycopy(tmpByte,0,ebyte,1,tmpByte.length);

   120                     index = tmpByte.length+1;

   121                 }

   122                 ebyte[index++] = ISO_ESC;

   123                 ebyte[index++] = ISO_SS2_7;

   124                 ebyte[index++] = (byte)(convByte[2]&0x7f);

   125                 ebyte[index++] = (byte)(convByte[3]&0x7f);

   126             }

   127             if((convByte[0] == SS2)&&(convByte[1] == 0xA3))

   128             {

   129                 if(!SS3DesDefined){

   130                     newSS3DesDefined = true;

   131                     ebyte[0] = ISO_ESC;

   132                     tmpByte = SS3Designator.getBytes();

   133                     System.arraycopy(tmpByte,0,ebyte,1,tmpByte.length);

   134                     index = tmpByte.length+1;

   135                 }

   136                 ebyte[index++] = ISO_ESC;

   137                 ebyte[index++] = ISO_SS3_7;

   138                 ebyte[index++] = (byte)(convByte[2]&0x7f);

   139                 ebyte[index++] = (byte)(convByte[3]&0x7f);

   140             }

   141         }

   142         return index;

   143     }

   144 

   145     /**

   146      * Character conversion

   147      */

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

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

   150         throws UnknownCharacterException, MalformedInputException,

   151                ConversionBufferFullException

   152     {

   153         int outputSize;

   154         byte [] tmpbuf = new byte[this.getMaxBytesPerChar()];

   155         byte [] outputByte;

   156 

   157         byteOff = outOff;

   158 

   159         newshiftout = shiftout;

   160         newSODesDefined = SODesDefined;

   161         newSS2DesDefined = SS2DesDefined;

   162         newSS3DesDefined = SS3DesDefined;

   163 

   164         //Fixed 4122961 by bringing the charOff++ out to this

   165         // loop where it belongs, changing the loop from

   166         // while(){} to for(){}.

   167         for (charOff = inOff; charOff < inEnd; charOff++) {

   168             outputByte = tmpbuf;

   169             if (input[charOff] < 0x80) {        // ASCII

   170                 if (shiftout){

   171                     newshiftout = false;

   172                     outputSize = 2;

   173                     outputByte[0] = ISO_SI;

   174                     outputByte[1] = (byte)(input[charOff] & 0x7f);

   175                 } else {

   176                     outputSize = 1;

   177                     outputByte[0] = (byte)(input[charOff] & 0x7f);

   178                 }

   179                 if(input[charOff] == '\n'){

   180                     newSODesDefined = false;

   181                     newSS2DesDefined = false;

   182                     newSS3DesDefined = false;

   183                 }

   184             } else {

   185                 outputSize = unicodeToNative(input[charOff], outputByte);

   186             }

   187 

   188             if (outputSize == -1) {

   189                 if (subMode) {

   190                     if(!newSODesDefined){

   191                         newSODesDefined = !newSODesDefined;

   192                         outputByte[0] = ISO_SO;

   193                         outputByte[1] = (byte)'?';

   194                         outputSize = 2;

   195                     } else {

   196                         outputByte = subBytes;

   197                         outputSize = subBytes.length;

   198                     }

   199                 } else {

   200                     badInputLength = 1;

   201                     throw new UnknownCharacterException();

   202                 }

   203             }

   204 

   205             if (outEnd - byteOff < outputSize)

   206                 throw new ConversionBufferFullException();

   207 

   208             for (int i = 0; i < outputSize; i++)

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

   210 

   211             // Bug 4266772. Update statuses only when output buffer has been

   212             // updated. When ConversionBufferFullException() has been throwed

   213             // we want to keep old statuses for next call.

   214             shiftout = newshiftout;

   215             SODesDefined = newSODesDefined;

   216             SS2DesDefined = newSS2DesDefined;

   217             SS3DesDefined = newSS3DesDefined;

   218         }

   219         return byteOff - outOff;

   220     }

   221 }