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Java file server with SMB, FTP/FTPS and NFS support, virtual filesystems, database filesystems
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/*
 * Copyright (C) 2006-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco 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 for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see .
 */

package org.filesys.smb;

import java.util.Calendar;
import java.util.Date;

/**
 * SMB date/time class.
 *
 * Date/time encoding returned by older SMB requests.
 *
 * @author gkspencer
 */
public final class SMBDate extends Date {

    // Constants
    //
    // Bit masks for extracting the date/time fields from an SMB encoded date/time.
    //
    private static final int Days   = 0x001F;
    private static final int Month  = 0x01E0;
    private static final int Year   = 0xFE00;

    private static final int TwoSeconds = 0x001F;
    private static final int Minutes    = 0x07E0;
    private static final int Hours      = 0xF800;

    /**
     * Construct the SMBDate using a seconds since 1-Jan-1970 00:00:00 value.
     *
     * @param secs Seconds since base date/time 1970 value
     */
    public SMBDate(int secs) {
        super(secs & 0x7FFFFFFF);
    }

    /**
     * Construct the SMBDate using the SMB encoded date/time values.
     *
     * @param dat SMB encoded date value
     * @param tim SMB encoded time value
     */
    public SMBDate(int dat, int tim) {

        //  Extract the date from the SMB encoded value
        int days = dat & Days;
        int months = (dat & Month) >> 5;
        int year = (dat & Year) >> 9;

        //  Extract the time from the SMB encoded value
        int secs = (tim & TwoSeconds) * 2;
        int mins = (tim & Minutes) >> 5;
        int hours = (tim & Hours) >> 11;

        //  Use a calendar object to create the date/time value
        Calendar cal = Calendar.getInstance();
        cal.clear();
        cal.set(year + 1980, months - 1, days, hours, mins, secs);

        //  Initialize this dates raw value
        this.setTime(cal.getTime().getTime());
    }

    /**
     * Create a new SMBDate using the long time value.
     *
     * @param dattim long
     */
    public SMBDate(long dattim) {
        super(dattim);
    }

    /**
     * Return this date as an SMB encoded date.
     *
     * @return SMB encoded date value.
     */

    public final int asSMBDate() {

        //  Use a calendar object to get the day, month and year values
        Calendar cal = Calendar.getInstance();
        cal.setTime(this);

        //  Build the SMB encoded date value
        int smbDate = cal.get(Calendar.DAY_OF_MONTH);
        smbDate += (cal.get(Calendar.MONTH) + 1) << 5;
        smbDate += (cal.get(Calendar.YEAR) - 1980) << 9;

        //  Return the SMB encoded date value
        return smbDate;
    }

    /**
     * Return this time as an SMB encoded time.
     *
     * @return SMB encoded time value.
     */

    public final int asSMBTime() {

        //  Use a calendar object to get the hour, minutes and seconds values
        Calendar cal = Calendar.getInstance();
        cal.setTime(this);

        //  Build the SMB encoded time value
        int smbTime = cal.get(Calendar.SECOND) / 2;
        smbTime += cal.get(Calendar.MINUTE) << 5;
        smbTime += cal.get(Calendar.HOUR_OF_DAY) << 11;

        //  Return the SMB encoded time value
        return smbTime;
    }
}