78 lines
2.7 KiB
Java
78 lines
2.7 KiB
Java
/*
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* Copyright 1996-1998 Sun Microsystems, Inc. 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. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.io;
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/**
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* @author Limin Shi
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* @author Mark Son-Bell
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*/
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public class CharToByteSJIS extends CharToByteJIS0208 {
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CharToByteJIS0201 cbJIS0201 = new CharToByteJIS0201();
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public String getCharacterEncoding() {
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return "SJIS";
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}
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protected int convSingleByte(char inputChar, byte[] outputByte) {
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byte b;
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// \u0000 - \u007F map straight through
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if ((inputChar & 0xFF80) == 0) {
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outputByte[0] = (byte)inputChar;
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return 1;
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}
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if ((b = cbJIS0201.getNative(inputChar)) == 0)
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return 0;
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outputByte[0] = b;
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return 1;
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}
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protected int getNative(char ch) {
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int offset = index1[ch >> 8] << 8;
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int pos = index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff));
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if (pos == 0) {
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/* Zero value indicates this Unicode has no mapping to JIS0208.
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* We bail here because the JIS -> SJIS algorithm produces
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* bogus SJIS values for invalid JIS input. Zero should be the
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* only invalid JIS value in our table.
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*/
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return 0;
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}
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/*
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* This algorithm for converting from JIS to SJIS comes from Ken Lunde's
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* "Understanding Japanese Information Processing", pg 163.
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*/
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int c1 = (pos >> 8) & 0xff;
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int c2 = pos & 0xff;
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int rowOffset = c1 < 0x5F ? 0x70 : 0xB0;
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int cellOffset = (c1 % 2 == 1) ? (c2 > 0x5F ? 0x20 : 0x1F) : 0x7E;
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return ((((c1 + 1 ) >> 1) + rowOffset) << 8) | (c2 + cellOffset);
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}
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}
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