| J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003 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 | * package private helper class which provides decoder (native->ucs) |
| 29 | * mapping capability for the benefit of compound encoders/decoders |
| 30 | * whose individual component submappings do not need an association with |
| 31 | * an enclosing charset |
| 32 | * |
| 33 | */ |
| 34 | |
| 35 | package sun.nio.cs.ext; |
| 36 | |
| 37 | public class DBCSDecoderMapping { |
| 38 | |
| 39 | /* 1rst level index */ |
| 40 | private short[] index1; |
| 41 | /* |
| 42 | * 2nd level index, provided by subclass |
| 43 | * every string has 0x10*(end-start+1) characters. |
| 44 | */ |
| 45 | private String[] index2; |
| 46 | |
| 47 | protected int start; |
| 48 | protected int end; |
| 49 | |
| 50 | protected static final char REPLACE_CHAR='\uFFFD'; |
| 51 | |
| 52 | public DBCSDecoderMapping(short[] index1, String[] index2, |
| 53 | int start, int end) { |
| 54 | this.index1 = index1; |
| 55 | this.index2 = index2; |
| 56 | this.start = start; |
| 57 | this.end = end; |
| 58 | } |
| 59 | |
| 60 | /* |
| 61 | * Can be changed by subclass |
| 62 | */ |
| 63 | protected char decodeSingle(int b) { |
| 64 | if (b >= 0) |
| 65 | return (char) b; |
| 66 | return REPLACE_CHAR; |
| 67 | } |
| 68 | |
| 69 | protected char decodeDouble(int byte1, int byte2) { |
| 70 | if (((byte1 < 0) || (byte1 > index1.length)) |
| 71 | || ((byte2 < start) || (byte2 > end))) |
| 72 | return REPLACE_CHAR; |
| 73 | |
| 74 | int n = (index1[byte1] & 0xf) * (end - start + 1) + (byte2 - start); |
| 75 | return index2[index1[byte1] >> 4].charAt(n); |
| 76 | } |
| 77 | } |