/*
* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* package private helper class which provides decoder (native->ucs)
* mapping capability for the benefit of compound encoders/decoders
* whose individual component submappings do not need an association with
* an enclosing charset
*
*/
package sun.nio.cs.ext;
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);
}
}