DBCSDecoderMapping.java revision 1245
0N/A/*
553N/A * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
0N/A * published by the Free Software Foundation. Sun designates this
0N/A * particular file as subject to the "Classpath" exception as provided
0N/A * by Sun in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
553N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
553N/A *
553N/A * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
0N/A * CA 95054 USA or visit www.sun.com if you need additional information or
0N/A * have any questions.
0N/A */
0N/A
0N/A/*
0N/A *
0N/A * package private helper class which provides decoder (native->ucs)
0N/A * mapping capability for the benefit of compound encoders/decoders
0N/A * whose individual component submappings do not need an association with
0N/A * an enclosing charset
0N/A *
0N/A */
0N/A
public class DBCSDecoderMapping {
/* 1rst level index */
private short[] index1;
/*
* 2nd level index, provided by subclass
* every string has 0x10*(end-start+1) characters.
*/
private String[] index2;
protected int start;
protected int end;
protected static final char REPLACE_CHAR='\uFFFD';
public DBCSDecoderMapping(short[] index1, String[] index2,
int start, int end) {
this.index1 = index1;
this.index2 = index2;
this.start = start;
this.end = end;
}
/*
* Can be changed by subclass
*/
protected char decodeSingle(int b) {
if (b >= 0)
return (char) b;
return REPLACE_CHAR;
}
protected char decodeDouble(int byte1, int byte2) {
if (((byte1 < 0) || (byte1 > index1.length))
|| ((byte2 < start) || (byte2 > end)))
return REPLACE_CHAR;
int n = (index1[byte1] & 0xf) * (end - start + 1) + (byte2 - start);
return index2[index1[byte1] >> 4].charAt(n);
}
}