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/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * Copyright 2000, 2010 Oracle and/or its affiliates.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org 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 Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/

/**
 *  Contains common static methods and contants for use within the package.
 *
 *  @author    Herbie Ong
 */

public final class PDBUtil {

    /** difference in seconds from Jan 01, 1904 to Jan 01, 1970 */
    final static long TIME_DIFF = 2082844800;

    /** encoding scheme used */
    final static String ENCODING = "8859_1";

    /** size of a pdb header in bytes */
    final static int HEADER_SIZE = 78;

    /**
     *  This method converts a 4 letter string into the Palm ID integer.
     *
     *  It is normally used to convert the Palm creator ID string into
     *  the integer version of it.  Also use for data types, etc.
     *
     *  @param   s    4 character string.
     *  @return   int    Palm ID representing the string.
     *  @throws   ArrayIndexOutOfBoundsException    if string parameter
     *                contains less than 4 characters.
     */

    public static int intID(String s) {

        int id = -1;
        int temp = 0;

        // grab the first char and put it in the high bits
        // note that we only want 8 lower bits of it.
        temp = (int) s.charAt(0);
        id = temp << 24;

        // grab the second char and add it in.
        temp = ((int) s.charAt(1)) & 0x00ff;
        id += temp << 16;

        // grab the second char and add it in.
        temp = ((int) s.charAt(2)) & 0x00ff;
        id += temp << 8;

        // grab the last char and add it in
        id += ((int) s.charAt(3)) & 0x00ff;

        return id;
    }

    /**
     *  This method converts an integer into a String given
     *  the Palm ID format.
     *
     *  @param  i   Palm id.
     *  @return  String   string representation.
     */

    public static String stringID(int i) {

        char ch[] = new char[4];
        ch[0] = (char) (i >>> 24);
        ch[1] = (char) ((i >> 16) & 0x00ff);
        ch[2] = (char) ((i >> 8) & 0x00ff);
        ch[3] = (char) (i & 0x00ff);

        return new String(ch);
    }
}