com.github.stephenc.javaisotools.iso9660.impl.ISO9660DateDataReference Maven / Gradle / Ivy

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/*
 * Copyright (c) 2010. Stephen Connolly.
 * Copyright (C) 2007. Jens Hatlak 
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

package com.github.stephenc.javaisotools.iso9660.impl;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import com.github.stephenc.javaisotools.sabre.DataReference;

public class ISO9660DateDataReference implements DataReference {

    private Date date = null;

    public ISO9660DateDataReference(Date date) {
        this.date = date;
    }

    public ISO9660DateDataReference(long date) {
        this(new Date(date));
    }

    public ISO9660DateDataReference() {
        this(new Date());
    }

    public long getLength() {
        return 17;
    }

    public InputStream createInputStream() throws IOException {
        byte[] buffer;
        if (date == null) {
            buffer = getEmptyDate();
        } else {
            buffer = getDate();
        }

        return new ByteArrayInputStream(buffer);
    }

    private byte[] getEmptyDate() {
        byte[] buffer = new byte[17];

        for (int i = 0; i < 16; i++) {
            buffer[i] = 0x30;
        }
        buffer[16] = 0;

        return buffer;
    }

    private byte[] getDate() {
        byte[] buffer = new byte[17];

        GregorianCalendar cal = new GregorianCalendar();
        cal.setTime(date);

        // Parse date
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH) + 1;
        int day = cal.get(Calendar.DAY_OF_MONTH);
        int hour = cal.get(Calendar.HOUR_OF_DAY);
        int minute = cal.get(Calendar.MINUTE);
        int second = cal.get(Calendar.SECOND);
        int hundredth_sec = cal.get(Calendar.MILLISECOND) / 10;
        int gmt_offset = cal.get(Calendar.ZONE_OFFSET) / (15 * 60 * 1000);

        // Create ISO9660 date
        StringBuffer dateString = new StringBuffer(17);
        dateString.append(padIntToString(year, 4));
        dateString.append(padIntToString(month, 2));
        dateString.append(padIntToString(day, 2));
        dateString.append(padIntToString(hour, 2));
        dateString.append(padIntToString(minute, 2));
        dateString.append(padIntToString(second, 2));
        dateString.append(padIntToString(hundredth_sec, 2));
        dateString.append(0);

        buffer = dateString.toString().getBytes();
        buffer[16] = (byte) gmt_offset;

        return buffer;
    }

    private String padIntToString(int value, int length) {
        String intValue = "" + value;
        StringBuffer buf = new StringBuffer(intValue);
        while (buf.length() < length) {
            buf.insert(0, "0");
        }
        return buf.toString();
    }
}