1 /*
   2  * Copyright (c) 1996, 2012, 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.awt.motif;
  27 
  28 import java.nio.ByteBuffer;
  29 import java.nio.CharBuffer;
  30 import java.nio.charset.*;
  31 import static sun.awt.motif.DoubleByte.*;
  32 
  33 public class X11JIS0201 extends Charset {
  34 
  35     private static Charset jis0201 = null;
  36     private static CharsetEncoder enc = null;
  37 
  38     static {
  39         jis0201 = Charset.forName("JIS_X0201");
  40         if (jis0201 != null) {
  41            enc = jis0201.newEncoder();
  42            enc.onMalformedInput(CodingErrorAction.REPORT);
  43            enc.onUnmappableCharacter(CodingErrorAction.REPORT);
  44         }
  45     }
  46 
  47     public X11JIS0201 () {
  48         super("X11JIS0201", null);
  49     }
  50 
  51     public CharsetEncoder newEncoder() {
  52         return new Encoder(this);
  53     }
  54 
  55     public CharsetDecoder newDecoder() {
  56         return jis0201.newDecoder();
  57     }
  58 
  59     public boolean contains(Charset cs) {
  60         return cs instanceof X11JIS0201;
  61     }
  62 
  63     private class Encoder extends CharsetEncoder {
  64 
  65         public Encoder(Charset cs) {
  66             super(cs, 1.0f, 1.0f);
  67         }
  68 
  69         public boolean canEncode(char c){
  70             if ((c >= 0xff61 && c <= 0xff9f)
  71                 || c == 0x203e
  72                 || c == 0xa5) {
  73                 return true;
  74             }
  75             return false;
  76         }
  77 
  78         private SurrogateParser sgp;
  79         protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {
  80 
  81             CoderResult cr = CoderResult.UNDERFLOW;
  82             if (enc == null) { /* essentially bail */
  83                 return cr;
  84             }
  85             char[] sa = src.array();
  86             int sp = src.arrayOffset() + src.position();
  87             int sl = src.arrayOffset() + src.limit();
  88 
  89             byte[] da = dst.array();
  90             int dp = dst.arrayOffset() + dst.position();
  91             int dl = dst.arrayOffset() + dst.limit();
  92             if ((dl - dp) < (sl - sp)) {
  93                 sl = sp + (dl - dp);
  94                 cr = CoderResult.OVERFLOW;
  95             }
  96             try {
  97                 char[] buf = new char[1];
  98                 while (sp < sl) {
  99                     boolean mapped = false;
 100                     char c = sa[sp];
 101                     ByteBuffer bb = null;
 102                     /* CharsetEncoders may not be thread safe */
 103                     synchronized (enc) {
 104                         if (enc.canEncode(c)) {
 105                             buf[0] = c;
 106                             CharBuffer cb = CharBuffer.wrap(buf);
 107                             try {
 108                                 bb = enc.encode(cb);
 109                                 mapped = true;
 110                             } catch (CharacterCodingException cce) {
 111                             }
 112                         }
 113                     }
 114                     if (mapped && bb != null) {
 115                         da[dp++] = bb.get();
 116                         sp++;
 117                     } else {
 118                         if (Character.isSurrogate(c)) {
 119                             if (sgp == null)
 120                                 sgp = new SurrogateParser();
 121                             if (sgp.parse(c, sa, sp, sl) >= 0)
 122                                 return CoderResult.unmappableForLength(2);
 123                         }
 124                         return CoderResult.unmappableForLength(1);
 125                     }
 126                 }
 127                 return cr;
 128             } finally {
 129                 src.position(sp - src.arrayOffset());
 130                 dst.position(dp - dst.arrayOffset());
 131             }
 132         }
 133     }
 134 }
 135