1 /* US_ASCII.java -- 2 Copyright (C) 2002 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., 59 Temple Place, Suite 330, Boston, MA 19 02111-1307 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 * US-ASCII charset. 49 * 50 * @author Jesse Rosenstock 51 */ 52 final class US_ASCII extends Charset 53 { US_ASCII()54 US_ASCII () 55 { 56 super ("US-ASCII", new String[]{"ISO646-US"}); 57 } 58 contains(Charset cs)59 public boolean contains (Charset cs) 60 { 61 return cs instanceof US_ASCII; 62 } 63 newDecoder()64 public CharsetDecoder newDecoder () 65 { 66 return new Decoder (this); 67 } 68 newEncoder()69 public CharsetEncoder newEncoder () 70 { 71 return new Encoder (this); 72 } 73 74 private static final class Decoder extends CharsetDecoder 75 { Decoder(Charset cs)76 private Decoder (Charset cs) 77 { 78 super (cs, 1.0f, 1.0f); 79 } 80 decodeLoop(ByteBuffer in, CharBuffer out)81 protected CoderResult decodeLoop (ByteBuffer in, CharBuffer out) 82 { 83 // TODO: Optimize this in the case in.hasArray() / out.hasArray() 84 while (in.hasRemaining ()) 85 { 86 byte b = in.get (); 87 88 if (b < 0) 89 { 90 in.position (in.position () - 1); 91 return CoderResult.malformedForLength (1); 92 } 93 if (!out.hasRemaining ()) 94 { 95 in.position (in.position () - 1); 96 return CoderResult.OVERFLOW; 97 } 98 99 out.put ((char) b); 100 } 101 102 return CoderResult.UNDERFLOW; 103 } 104 } 105 106 private static final class Encoder extends CharsetEncoder 107 { Encoder(Charset cs)108 private Encoder (Charset cs) 109 { 110 super (cs, 1.0f, 1.0f); 111 } 112 encodeLoop(CharBuffer in, ByteBuffer out)113 protected CoderResult encodeLoop (CharBuffer in, ByteBuffer out) 114 { 115 // TODO: Optimize this in the case in.hasArray() / out.hasArray() 116 while (in.hasRemaining ()) 117 { 118 char c = in.get (); 119 120 if (c > Byte.MAX_VALUE) 121 { 122 in.position (in.position () - 1); 123 return CoderResult.unmappableForLength (1); 124 } 125 if (!out.hasRemaining ()) 126 { 127 in.position (in.position () - 1); 128 return CoderResult.OVERFLOW; 129 } 130 131 out.put ((byte) c); 132 } 133 134 return CoderResult.UNDERFLOW; 135 } 136 } 137 } 138