75 lines
2.3 KiB
Java
75 lines
2.3 KiB
Java
/*
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* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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*
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* package private helper class which provides decoder (native->ucs)
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* mapping capability for the benefit of compound encoders/decoders
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* whose individual component submappings do not need an association with
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* an enclosing charset
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*
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*/
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public class DBCSDecoderMapping {
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/* 1rst level index */
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private short[] index1;
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/*
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* 2nd level index, provided by subclass
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* every string has 0x10*(end-start+1) characters.
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*/
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private String[] index2;
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protected int start;
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protected int end;
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protected static final char REPLACE_CHAR='\uFFFD';
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public DBCSDecoderMapping(short[] index1, String[] index2,
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int start, int end) {
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this.index1 = index1;
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this.index2 = index2;
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this.start = start;
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this.end = end;
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}
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/*
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* Can be changed by subclass
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*/
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protected char decodeSingle(int b) {
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if (b >= 0)
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return (char) b;
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return REPLACE_CHAR;
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}
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protected char decodeDouble(int byte1, int byte2) {
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if (((byte1 < 0) || (byte1 > index1.length))
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|| ((byte2 < start) || (byte2 > end)))
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return REPLACE_CHAR;
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int n = (index1[byte1] & 0xf) * (end - start + 1) + (byte2 - start);
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return index2[index1[byte1] >> 4].charAt(n);
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}
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}
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