1 /*
   2  * Copyright (c) 2001, 2008, 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.CharBuffer;
  29 import java.nio.ByteBuffer;
  30 import java.nio.charset.*;
  31 import sun.nio.cs.*;
  32 import sun.nio.cs.ext.*;
  33 
  34 public abstract class X11CNS11643 extends Charset {
  35     private final int plane;
  36     public X11CNS11643 (int plane, String name) {
  37         super(name, null);
  38         switch (plane) {
  39         case 1:
  40             this.plane = 0; // CS1
  41             break;
  42         case 2:
  43         case 3:
  44             this.plane = plane;
  45             break;
  46         default:
  47             throw new IllegalArgumentException
  48                 ("Only planes 1, 2, and 3 supported");
  49         }
  50     }
  51 
  52     public CharsetEncoder newEncoder() {
  53         return new Encoder(this, plane);
  54     }
  55 
  56     public CharsetDecoder newDecoder() {
  57         return new Decoder(this, plane);
  58     }
  59 
  60     public boolean contains(Charset cs) {
  61         return cs instanceof X11CNS11643;
  62     }
  63 
  64     private class Encoder extends EUC_TW.Encoder {
  65         private int plane;
  66         public Encoder(Charset cs, int plane) {
  67             super(cs);
  68             this.plane = plane;
  69         }
  70 
  71         private byte[] bb = new byte[4];
  72         public boolean canEncode(char c) {
  73             if (c <= 0x7F) {
  74                 return false;
  75             }
  76             int nb = toEUC(c, bb);
  77             if (nb == -1)
  78                 return false;
  79             int p = 0;
  80             if (nb == 4)
  81                 p = (bb[1] & 0xff) - 0xa0;
  82             return (p == plane);
  83         }
  84 
  85         public boolean isLegalReplacement(byte[] repl) {
  86             return true;
  87         }
  88 
  89         protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {
  90             char[] sa = src.array();
  91             int sp = src.arrayOffset() + src.position();
  92             int sl = src.arrayOffset() + src.limit();
  93             byte[] da = dst.array();
  94             int dp = dst.arrayOffset() + dst.position();
  95             int dl = dst.arrayOffset() + dst.limit();
  96 
  97             try {
  98                 while (sp < sl) {
  99                     char c = sa[sp];
 100                     if ( c > '\u007f'&& c < '\uFFFE') {
 101                         int nb = toEUC(c, bb);
 102                         if (nb != -1) {
 103                             int p = 0;
 104                             if (nb == 4)
 105                                 p = (bb[1] & 0xff) - 0xa0;
 106                             if (p == plane) {
 107                                 if (dl - dp < 2)
 108                                     return CoderResult.OVERFLOW;
 109                                 if (nb == 2) {
 110                                     da[dp++] = (byte)(bb[0] & 0x7f);
 111                                     da[dp++] = (byte)(bb[1] & 0x7f);
 112                                 } else {
 113                                     da[dp++] = (byte)(bb[2] & 0x7f);
 114                                     da[dp++] = (byte)(bb[3] & 0x7f);
 115                                 }
 116                                 sp++;
 117                                 continue;
 118                             }
 119                         }
 120                     }
 121                     return CoderResult.unmappableForLength(1);
 122                 }
 123                 return CoderResult.UNDERFLOW;
 124             } finally {
 125                 src.position(sp - src.arrayOffset());
 126                 dst.position(dp - dst.arrayOffset());
 127             }
 128         }
 129     }
 130 
 131     private class Decoder extends EUC_TW.Decoder {
 132         int plane;
 133         private String table;
 134         protected Decoder(Charset cs, int plane) {
 135             super(cs);
 136             if (plane == 0)
 137                 this.plane = plane;
 138             else if (plane == 2 || plane == 3)
 139                 this.plane = plane - 1;
 140             else
 141                 throw new IllegalArgumentException
 142                     ("Only planes 1, 2, and 3 supported");
 143         }
 144 
 145         //we only work on array backed buffer.
 146         protected CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {
 147             byte[] sa = src.array();
 148             int sp = src.arrayOffset() + src.position();
 149             int sl = src.arrayOffset() + src.limit();
 150 
 151             char[] da = dst.array();
 152             int dp = dst.arrayOffset() + dst.position();
 153             int dl = dst.arrayOffset() + dst.limit();
 154 
 155             try {
 156                 while (sp < sl) {
 157                     if ( sl - sp < 2) {
 158                         return CoderResult.UNDERFLOW;
 159                     }
 160                     int b1 = (sa[sp] & 0xff) | 0x80;
 161                     int b2 = (sa[sp + 1] & 0xff) | 0x80;
 162                     char[] cc = toUnicode(b1, b2, plane);
 163                     // plane3 has non-bmp characters(added), x11cnsp3
 164                     // however does not support them
 165                     if (cc == null || cc.length == 2)
 166                         return CoderResult.unmappableForLength(2);
 167                     if (dl - dp < 1)
 168                         return CoderResult.OVERFLOW;
 169                     da[dp++] = cc[0];
 170                     sp +=2;
 171                 }
 172                 return CoderResult.UNDERFLOW;
 173             } finally {
 174                 src.position(sp - src.arrayOffset());
 175                 dst.position(dp - dst.arrayOffset());
 176             }
 177         }
 178     }
 179 }
--- EOF ---