1 /*
   2  * Copyright 2003-2004 Sun Microsystems, Inc.  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.  Sun designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  22  * CA 95054 USA or visit www.sun.com if you need additional information or
  23  * have any questions.
  24  */
  25 
  26 package sun.nio.cs.ext;
  27 
  28 import java.nio.charset.Charset;
  29 import java.nio.charset.CharsetDecoder;
  30 import java.nio.charset.CharsetEncoder;
  31 import java.util.Arrays;
  32 import sun.nio.cs.HistoricallyNamedCharset;
  33 
  34 public class IBM943C extends Charset implements HistoricallyNamedCharset
  35 {
  36 
  37     public IBM943C() {
  38         super("x-IBM943C", ExtendedCharsets.aliasesFor("x-IBM943C"));
  39     }
  40 
  41     public String historicalName() {
  42         return "Cp943C";
  43     }
  44 
  45     public boolean contains(Charset cs) {
  46         return ((cs.name().equals("US-ASCII"))
  47                 || (cs instanceof IBM943C));
  48     }
  49 
  50     public CharsetDecoder newDecoder() {
  51         return new DoubleByte.Decoder(this,
  52                                       IBM943.b2c,
  53                                       b2cSB,
  54                                       0x40,
  55                                       0xfc);
  56     }
  57 
  58     public CharsetEncoder newEncoder() {
  59         return new DoubleByte.Encoder(this, c2b, c2bIndex);
  60     }
  61 
  62     final static char[] b2cSB;
  63     final static char[] c2b;
  64     final static char[] c2bIndex;
  65 
  66     static {
  67         IBM943.initb2c();
  68         b2cSB = new char[0x100];
  69         for (int i = 0; i < 0x80; i++) {
  70             b2cSB[i] = (char)i;
  71         }
  72         for (int i = 0x80; i < 0x100; i++) {
  73             b2cSB[i] = IBM943.b2cSB[i];
  74         }
  75 
  76         IBM943.initc2b();
  77         c2b = Arrays.copyOf(IBM943.c2b, IBM943.c2b.length);
  78         c2bIndex = Arrays.copyOf(IBM943.c2bIndex, IBM943.c2bIndex.length);
  79         for (char c = '\0'; c < '\u0080'; ++c) {
  80             int index = c2bIndex[c >> 8];
  81             c2b[index + (c & 0xff)] = c;
  82         }
  83     }
  84 }