/*
* Copyright (c) 1996, 1998, 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 sun.io;
/**
* @author Limin Shi
* @author Mark Son-Bell
*/
public class CharToByteSJIS extends CharToByteJIS0208 {
CharToByteJIS0201 cbJIS0201 = new CharToByteJIS0201();
public String getCharacterEncoding() {
return "SJIS";
}
protected int convSingleByte(char inputChar, byte[] outputByte) {
byte b;
// \u0000 - \u007F map straight through
if ((inputChar & 0xFF80) == 0) {
outputByte[0] = (byte)inputChar;
return 1;
}
if ((b = cbJIS0201.getNative(inputChar)) == 0)
return 0;
outputByte[0] = b;
return 1;
}
protected int getNative(char ch) {
int offset = index1[ch >> 8] << 8;
int pos = index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff));
if (pos == 0) {
/* Zero value indicates this Unicode has no mapping to JIS0208.
* We bail here because the JIS -> SJIS algorithm produces
* bogus SJIS values for invalid JIS input. Zero should be the
* only invalid JIS value in our table.
*/
return 0;
}
/*
* This algorithm for converting from JIS to SJIS comes from Ken Lunde's
* "Understanding Japanese Information Processing", pg 163.
*/
int c1 = (pos >> 8) & 0xff;
int c2 = pos & 0xff;
int rowOffset = c1 < 0x5F ? 0x70 : 0xB0;
int cellOffset = (c1 % 2 == 1) ? (c2 > 0x5F ? 0x20 : 0x1F) : 0x7E;
return ((((c1 + 1 ) >> 1) + rowOffset) << 8) | (c2 + cellOffset);
}
}