J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2000-2006 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 | /* |
| 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 | } |