1 /*
   2  * Copyright (c) 2003, 2004, 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.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.DoubleByte;
  33 import sun.nio.cs.HistoricallyNamedCharset;
  34 import static sun.nio.cs.CharsetMapping.*;
  35 
  36 public class IBM942C extends Charset implements HistoricallyNamedCharset
  37 {
  38     public IBM942C() {
  39         super("x-IBM942C", ExtendedCharsets.aliasesFor("x-IBM942C"));
  40     }
  41 
  42     public String historicalName() {
  43         return "Cp942C";
  44     }
  45 
  46     public boolean contains(Charset cs) {
  47         return ((cs.name().equals("US-ASCII"))
  48                 || (cs instanceof IBM942C));
  49     }
  50 
  51     public CharsetDecoder newDecoder() {
  52         return new DoubleByte.Decoder(this,
  53                                       IBM942.b2c,
  54                                       b2cSB,
  55                                       0x40,
  56                                       0xfc);
  57     }
  58 
  59     public CharsetEncoder newEncoder() {
  60         return new DoubleByte.Encoder(this, c2b, c2bIndex);
  61     }
  62 
  63     final static char[] b2cSB;
  64     final static char[] c2b;
  65     final static char[] c2bIndex;
  66 
  67     static {
  68         IBM942.initb2c();
  69 
  70         // the mappings need udpate are
  71         //    u+001a  <-> 0x1a
  72         //    u+001c  <-> 0x1c
  73         //    u+005c  <-> 0x5c
  74         //    u+007e  <-> 0x7e
  75         //    u+007f  <-> 0x7f
  76 
  77         b2cSB = Arrays.copyOf(IBM942.b2cSB, IBM942.b2cSB.length);
  78         b2cSB[0x1a] = 0x1a;
  79         b2cSB[0x1c] = 0x1c;
  80         b2cSB[0x5c] = 0x5c;
  81         b2cSB[0x7e] = 0x7e;
  82         b2cSB[0x7f] = 0x7f;
  83 
  84         IBM942.initc2b();
  85         c2b = Arrays.copyOf(IBM942.c2b, IBM942.c2b.length);
  86         c2bIndex = Arrays.copyOf(IBM942.c2bIndex, IBM942.c2bIndex.length);
  87         c2b[c2bIndex[0] + 0x1a] = 0x1a;
  88         c2b[c2bIndex[0] + 0x1c] = 0x1c;
  89         c2b[c2bIndex[0] + 0x5c] = 0x5c;
  90         c2b[c2bIndex[0] + 0x7e] = 0x7e;
  91         c2b[c2bIndex[0] + 0x7f] = 0x7f;
  92     }
  93 }