Source for gnu.javax.imageio.png.PNGTime

   1: /* PNGTime.java --
   2:    Copyright (C) 2006 Free Software Foundation
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: package gnu.javax.imageio.png;
  39: 
  40: import java.util.Date;
  41: 
  42: /**
  43:  * A PNG tIME chunk.
  44:  */
  45: public class PNGTime extends PNGChunk
  46: {
  47:   private Date date;
  48: 
  49:   protected PNGTime( int type, byte[] data, int crc ) throws PNGException
  50:   {
  51:     super( type, data, crc );
  52:     if( data.length < 7 )
  53:       throw new PNGException("Unexpectedly short time chunk. ("+data.length+" bytes)");
  54: 
  55:     // PNG value is absolute (2006, not 106 or 06), java is from 1900.
  56:     int year = ( (data[0] & 0xFF) << 8 ) | (data[1] & 0xFF);
  57:     int month = (data[2] & 0xFF); // java counts from 0. PNG from 1.
  58:     int day = (data[3] & 0xFF);
  59:     int hour = (data[4] & 0xFF);
  60:     int minute = (data[5] & 0xFF);
  61:     int second = (data[6] & 0xFF);
  62:     date = new Date( year - 1900, month - 1, day, hour, minute, second );
  63:   }
  64: 
  65:   public PNGTime( Date d )
  66:   {
  67:     super( TYPE_TIME );
  68:     data = new byte[ 7 ];
  69:     int tmp = d.getYear() + 1900;
  70:     data[0] = (byte)((tmp & 0xFF00) >> 8);
  71:     data[1] = (byte)(tmp & 0x00FF);
  72:     data[2] = (byte)(d.getMonth() + 1);
  73:     data[3] = (byte)(d.getDay());
  74:     data[4] = (byte)(d.getHours());
  75:     data[5] = (byte)(d.getMinutes());
  76:     data[6] = (byte)(d.getSeconds());
  77:   }
  78: 
  79:   public String toString()
  80:   {
  81:     return "PNG Time chunk: "+date;
  82:   }
  83: }