jdk/src/share/classes/sun/io/CharToBytePCK.java

/*
 * Copyright 2003 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package sun.io;

import sun.nio.cs.ext.JIS_X_0208_Solaris_Encoder;

/**
 * @author Limin Shi
 * @author Mark Son-Bell
 * @author Ian Little
 *
 * PCK char->byte converter for Solaris platform containing additional
 * mappings for vendor defined chars (NEC row 13 & IBM extension chars)
 * (bugID 4765370)
 */
public class CharToBytePCK extends CharToByteSJIS {
    CharToByteJIS0201 cbJIS0201 = new CharToByteJIS0201();
    short[] j0208Index1 = JIS_X_0208_Solaris_Encoder.getIndex1();
    String[] j0208Index2 = JIS_X_0208_Solaris_Encoder.getIndex2();

    public String getCharacterEncoding() {
        return "PCK";
    }

    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 result = 0;

         switch (ch) {
            case '\u2015':
                return (int)0x815C;
            case '\u2014':
                return 0;
            default:
                break;
        }

        if ((result = super.getNative(ch)) != 0) {
            return result;
        } else {
            int offset = j0208Index1[ch >> 8] << 8;
            int pos = j0208Index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff));

            if (pos != 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;
                result =  ((((c1 + 1 ) >> 1) + rowOffset) << 8) | (c2 + cellOffset);
            }
        }
        return result;
    }
}