1 /*
   2  * Copyright (c) 1996, 2005, 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 
  32 public class X11Dingbats extends Charset {
  33     public X11Dingbats () {
  34         super("X11Dingbats", null);
  35     }
  36 
  37     public CharsetEncoder newEncoder() {
  38         return new Encoder(this);
  39     }
  40 
  41     /* Seems like supporting a decoder is required, but we aren't going
  42      * to be publically exposing this class, so no need to waste work
  43      */
  44     public CharsetDecoder newDecoder() {
  45         throw new Error("Decoder is not supported by X11Dingbats Charset");
  46     }
  47 
  48     public boolean contains(Charset cs) {
  49         return cs instanceof X11Dingbats;
  50     }
  51 
  52     private static class Encoder extends CharsetEncoder {
  53         public Encoder(Charset cs) {
  54             super(cs, 1.0f, 1.0f);
  55         }
  56 
  57         public boolean canEncode(char ch) {
  58             if (ch >= 0x2701 && ch <= 0x275e) { // direct map
  59                 return true;
  60             }
  61             if (ch >= 0x2761 && ch <= 0x27be) {
  62                 return (table[ch - 0x2761] != 0x00);
  63             }
  64             return false;
  65         }
  66 
  67         protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {
  68             char[] sa = src.array();
  69             int sp = src.arrayOffset() + src.position();
  70             int sl = src.arrayOffset() + src.limit();
  71             assert (sp <= sl);
  72             sp = (sp <= sl ? sp : sl);
  73             byte[] da = dst.array();
  74             int dp = dst.arrayOffset() + dst.position();
  75             int dl = dst.arrayOffset() + dst.limit();
  76             assert (dp <= dl);
  77             dp = (dp <= dl ? dp : dl);
  78 
  79             try {
  80                 while (sp < sl) {
  81                     char c = sa[sp];
  82                     if (dl - dp < 1)
  83                         return CoderResult.OVERFLOW;
  84 
  85                     if (!canEncode(c))
  86                         return CoderResult.unmappableForLength(1);
  87                     sp++;
  88                     if (c >= 0x2761){
  89                         da[dp++] = table[c - 0x2761]; // table lookup
  90                     } else {
  91                         da[dp++] = (byte)(c + 0x20 - 0x2700); // direct map
  92                     }
  93                 }
  94                 return CoderResult.UNDERFLOW;
  95             } finally {
  96                 src.position(sp - src.arrayOffset());
  97                 dst.position(dp - dst.arrayOffset());
  98             }
  99         }
 100 
 101         private static byte[] table = {
 102             (byte)0xa1, (byte)0xa2, (byte)0xa3, (byte)0xa4,
 103             (byte)0xa5, (byte)0xa6, (byte)0xa7,
 104             (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
 105             (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
 106             (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
 107             (byte)0x00, (byte)0x00, (byte)0xb6, (byte)0xb7,
 108             (byte)0xb8, (byte)0xb9, (byte)0xba, (byte)0xbb,
 109             (byte)0xbc, (byte)0xbd, (byte)0xbe, (byte)0xbf,
 110             (byte)0xc0, (byte)0xc1, (byte)0xc2, (byte)0xc3,
 111             (byte)0xc4, (byte)0xc5, (byte)0xc6, (byte)0xc7,
 112             (byte)0xc8, (byte)0xc9, (byte)0xca, (byte)0xcb,
 113             (byte)0xcc, (byte)0xcd, (byte)0xce, (byte)0xcf,
 114             (byte)0xd0, (byte)0xd1, (byte)0xd2, (byte)0xd3,
 115             (byte)0xd4, (byte)0x00, (byte)0x00, (byte)0x00,
 116             (byte)0xd8, (byte)0xd9, (byte)0xda, (byte)0xdb,
 117             (byte)0xdc, (byte)0xdd, (byte)0xde, (byte)0x00,
 118             (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
 119             (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
 120             (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
 121             (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
 122             (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
 123             (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
 124             (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
 125             (byte)0x00, (byte)0x00, (byte)0x00};
 126 
 127         /* The default implementation creates a decoder and we don't have one */
 128         public boolean isLegalReplacement(byte[] repl) {
 129             return true;
 130         }
 131     }
 132 }