libjava/classpath/gnu/java/nio/charset/ISO_8859_1.java

   1 /* ISO_8859_1.java --
   2    Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 package gnu.java.nio.charset;
  39
  40 import java.nio.ByteBuffer;
  41 import java.nio.CharBuffer;
  42 import java.nio.charset.Charset;
  43 import java.nio.charset.CharsetDecoder;
  44 import java.nio.charset.CharsetEncoder;
  45 import java.nio.charset.CoderResult;
  46
  47 /**
  48  * ISO-8859-1 charset.
  49  *
  50  * @author Jesse Rosenstock
  51  */
  52 final class ISO_8859_1 extends Charset
  53 {
  54   ISO_8859_1 ()
  55   {
  56     /* Canonical charset name chosen according to:
  57      * http://java.sun.com/j2se/1.5.0/docs/guide/intl/encoding.doc.html
  58      */
  59     super ("ISO-8859-1", new String[] {
  60         /* These names are provided by
  61          * http://www.iana.org/assignments/character-sets
  62          */
  63         "iso-ir-100",
  64         "ISO_8859-1",
  65         "latin1",
  66         "l1",
  67         "IBM819",
  68         "CP819",
  69         "csISOLatin1",
  70         "8859_1",
  71         /* These names are provided by
  72          * http://oss.software.ibm.com/cgi-bin/icu/convexp?s=ALL
  73          */
  74         "ISO8859_1",
  75         "ISO_8859_1",
  76         "ibm-819",
  77         "ISO_8859-1:1987",
  78         "819",
  79         "ISO8859-1"
  80         });
  81
  82   }
  83
  84   public boolean contains (Charset cs)
  85   {
  86     return cs instanceof US_ASCII || cs instanceof ISO_8859_1;
  87   }
  88
  89   public CharsetDecoder newDecoder ()
  90   {
  91     return new Decoder (this);
  92   }
  93
  94   public CharsetEncoder newEncoder ()
  95   {
  96     return new Encoder (this);
  97   }
  98
  99   private static final class Decoder extends CharsetDecoder
 100   {
 101     // Package-private to avoid a trampoline constructor.
 102     Decoder (Charset cs)
 103     {
 104       super (cs, 1.0f, 1.0f);
 105     }
 106
 107     protected CoderResult decodeLoop (ByteBuffer in, CharBuffer out)
 108     {
 109       // TODO: Optimize this in the case in.hasArray() / out.hasArray()
 110       while (in.hasRemaining ())
 111       {
 112         byte b = in.get ();
 113
 114         if (!out.hasRemaining ())
 115           {
 116             in.position (in.position () - 1);
 117             return CoderResult.OVERFLOW;
 118           }
 119
 120         out.put ((char) (b & 0xFF));
 121       }
 122
 123       return CoderResult.UNDERFLOW;
 124     }
 125   }
 126
 127   private static final class Encoder extends CharsetEncoder
 128   {
 129     // Package-private to avoid a trampoline constructor.
 130     Encoder (Charset cs)
 131     {
 132       super (cs, 1.0f, 1.0f);
 133     }
 134
 135     public boolean canEncode(char c)
 136     {
 137       return c <= 0xff;
 138     }
 139
 140     public boolean canEncode(CharSequence cs)
 141     {
 142       for (int i = 0; i < cs.length(); ++i)
 143         if (! canEncode(cs.charAt(i)))
 144           return false;
 145       return true;
 146     }
 147
 148     protected CoderResult encodeLoop (CharBuffer in, ByteBuffer out)
 149     {
 150       // TODO: Optimize this in the case in.hasArray() / out.hasArray()
 151       while (in.hasRemaining ())
 152       {
 153         char c = in.get ();
 154
 155         if (c > 0xFF)
 156           {
 157             in.position (in.position () - 1);
 158             return CoderResult.unmappableForLength (1);
 159           }
 160         if (!out.hasRemaining ())
 161           {
 162             in.position (in.position () - 1);
 163             return CoderResult.OVERFLOW;
 164           }
 165
 166         out.put ((byte) c);
 167       }
 168
 169       return CoderResult.UNDERFLOW;
 170     }
 171   }
 172 }