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.font;
  27 
  28 import java.nio.CharBuffer;
  29 import java.nio.ByteBuffer;
  30 import java.nio.charset.*;
  31 import sun.nio.cs.*;

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