Java Encode encodeUTCTime(long time, OutputStream os)

Description

encode UTC Time

License

Open Source License

Declaration

public static void encodeUTCTime(long time, OutputStream os) throws IOException 

Method Source Code

//package com.java2s;
/**/*from   w w  w  .  j  a va  2  s .com*/
   DERUtils.java
    
   Copyright (C) 1999, Claymore Systems, Inc.
   All Rights Reserved.
    
   ekr@rtfm.com  Sat Jul 24 21:24:06 1999
    
   This package is a SSLv3/TLS implementation written by Eric Rescorla
   <ekr\@rtfm.com> and licensed by Claymore Systems, Inc.
    
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:
   1. Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in the
  documentation and/or other materials provided with the distribution.
   3. All advertising materials mentioning features or use of this software
  must display the following acknowledgement:
  This product includes software developed by Claymore Systems, Inc.
   4. Neither the name of Claymore Systems, Inc. nor the name of Eric
  Rescorla may be used to endorse or promote products derived from this
  software without specific prior written permission.
    
   THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   SUCH DAMAGE.
    
    
   $Id: DERUtils.java,v 1.1.1.1 2003/05/09 20:36:14 gawor Exp $
    
*/

import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.TimeZone;
import java.util.Date;
import java.io.*;

public class Main {
    public static final byte UTCTIME = (byte) (0x17);

    public static void encodeUTCTime(long time, OutputStream os) throws IOException {
        byte[] tbuf = new byte[13];
        int offset = 0;

        Date d = new Date(time);
        TimeZone tz = TimeZone.getTimeZone("GMT");
        Calendar cal = new GregorianCalendar(tz);
        cal.setTime(d);

        /* Now fill in the data */
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH);
        month += 1; // compensate for zero numbering 
        int day = cal.get(Calendar.DAY_OF_MONTH);
        int hr = cal.get(Calendar.HOUR_OF_DAY);
        int min = cal.get(Calendar.MINUTE);
        int sec = cal.get(Calendar.SECOND);

        if (year < 1950)
            throw new InternalError("Bad time to encode " + cal.toString());
        if (year > 2049)
            throw new InternalError("Bad time to encode " + cal.toString());
        if (year < 2000) {
            year -= 1900;
        } else {
            year -= 2000;
        }

        put2digits(tbuf, year, offset);
        offset += 2;
        put2digits(tbuf, month, offset);
        offset += 2;
        put2digits(tbuf, day, offset);
        offset += 2;
        put2digits(tbuf, hr, offset);
        offset += 2;
        put2digits(tbuf, min, offset);
        offset += 2;
        put2digits(tbuf, sec, offset);
        offset += 2;
        tbuf[offset] = (byte) 'Z';

        encodeBytes(UTCTIME, tbuf, os);
    }

    private static void put2digits(byte[] buf, int val, int offset) {
        if (val > 99)
            throw new InternalError("Illegal value");
        if (val < 0)
            throw new InternalError("Illegal value");

        buf[offset++] = (byte) (((val / 10) + 48) & 0xff); // Who asked Java to require the & 0xff
        buf[offset++] = (byte) (((val % 10) + 48) & 0xff);
    }

    private static void encodeBytes(byte type, byte[] in, OutputStream os) throws IOException {
        os.write(type);
        writeLength(in.length, os);
        os.write(in);
    }

    private static void writeLength(int length, OutputStream os) throws IOException {
        if (length < 128) {
            os.write((byte) length);
        } else {
            ByteArrayOutputStream bs = new ByteArrayOutputStream();
            int i;

            for (i = 1; length > 0; i++) {
                bs.write((byte) (length & 0xff));
                length >>= 8;
            }

            byte[] b = bs.toByteArray();
            os.write((byte) (0x80 | b.length));

            for (i = 0; i < b.length; i++) {
                os.write(b[b.length - (i + 1)]);
            }
        }
    }
}

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