/*

 * 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

 * particular file as subject to the "Classpath" exception as provided

 *

 * 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.

 *

 */

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);

    }

}