1 /* 2 * Copyright (c) 2000, 2006, 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 /* 27 */ 28 29 package sun.nio.cs; 30 31 import java.nio.ByteBuffer; 32 import java.nio.CharBuffer; 33 import java.nio.charset.Charset; 34 import java.nio.charset.CharsetDecoder; 35 import java.nio.charset.CoderResult; 36 import java.nio.charset.CharacterCodingException; 37 import java.nio.charset.MalformedInputException; 38 import java.nio.charset.UnmappableCharacterException; 39 40 41 public abstract class SingleByteDecoder 42 extends CharsetDecoder 43 { 44 45 private final String byteToCharTable; 46 47 protected SingleByteDecoder(Charset cs, String byteToCharTable) { 48 super(cs, 1.0f, 1.0f); 49 this.byteToCharTable = byteToCharTable; 50 } 51 52 private CoderResult decodeArrayLoop(ByteBuffer src, CharBuffer dst) { 53 byte[] sa = src.array(); 54 int sp = src.arrayOffset() + src.position(); 55 int sl = src.arrayOffset() + src.limit(); 56 assert (sp <= sl); 57 sp = (sp <= sl ? sp : sl); 58 char[] da = dst.array(); 59 int dp = dst.arrayOffset() + dst.position(); 60 int dl = dst.arrayOffset() + dst.limit(); 61 assert (dp <= dl); 62 dp = (dp <= dl ? dp : dl); 63 64 try { 65 while (sp < sl) { 66 int b = sa[sp]; 67 68 char c = decode(b); 69 if (c == '\uFFFD') 70 return CoderResult.unmappableForLength(1); 71 if (dl - dp < 1) 72 return CoderResult.OVERFLOW; 73 da[dp++] = c; 74 sp++; 75 } 76 return CoderResult.UNDERFLOW; 77 } finally { 78 src.position(sp - src.arrayOffset()); 79 dst.position(dp - dst.arrayOffset()); 80 } 81 } 82 83 private CoderResult decodeBufferLoop(ByteBuffer src, CharBuffer dst) { 84 int mark = src.position(); 85 try { 86 while (src.hasRemaining()) { 87 int b = src.get(); 88 89 char c = decode(b); 90 if (c == '\uFFFD') 91 return CoderResult.unmappableForLength(1); 92 if (!dst.hasRemaining()) 93 return CoderResult.OVERFLOW; 94 mark++; 95 dst.put(c); 96 } 97 return CoderResult.UNDERFLOW; 98 } finally { 99 src.position(mark); 100 } 101 } 102 103 protected CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) { 104 if (true && src.hasArray() && dst.hasArray()) 105 return decodeArrayLoop(src, dst); 106 else 107 return decodeBufferLoop(src, dst); 108 } 109 110 public char decode(int byteIndex) { 111 int n = byteIndex + 128; 112 if (n >= byteToCharTable.length() || n < 0) 113 return '\uFFFD'; 114 return byteToCharTable.charAt(n); 115 } 116 }