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<?php
/******************************************************************************
*
* Filename: get_exif_thumb.php
*
* Description: This script extracts a EXIF thumbnail from the first IFD of a
* JPEG file and allows it to be displayed
*
* Usage: get_exif_thumb?filename=<filename>
*
* Author: Evan Hunter
*
* Date: 23/7/2004
*
* Project: PHP JPEG Metadata Toolkit
*
* Revision: 1.00
*
* URL: http://electronics.ozhiker.com
*
* Copyright: Copyright Evan Hunter 2004
*
* License: This file is part of the PHP JPEG Metadata Toolkit.
*
* The PHP JPEG Metadata Toolkit is free software; you can
* redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* The PHP JPEG Metadata Toolkit 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 General Public License
* for more details.
*
* You should have received a copy of the GNU General Public
* License along with the PHP JPEG Metadata Toolkit; if not,
* write to the Free Software Foundation, Inc., 59 Temple
* Place, Suite 330, Boston, MA 02111-1307 USA
*
* If you require a different license for commercial or other
* purposes, please contact the author: evan@ozhiker.com
*
******************************************************************************/
// Ensure that nothing can write to the standard io, before we get the header out
ob_start( );
require_once 'JPEG.php';
require_once 'EXIF.php';
// retrieve the filename from the URL parameters
$filename = $GLOBALS['HTTP_GET_VARS']['filename'];
// Retrieve any EXIF data in the file
$Exif_array = get_EXIF_JPEG( $filename );
// Check if EXIF data was retrieved
if ( $Exif_array === FALSE )
{
// No EXIF data could be retrieved - abort
ob_end_clean ( );
echo "<p>EXIF segment could not be retrieved</p>\n";
return;
}
// Check if the First IFD exists ( The First IFD is actually the second, since there is also the zeroth IFD)
if ( count( $Exif_array ) < 2 )
{
ob_end_clean ( );
echo "<p>Couldn't find Thumbnail IFD</p>\n";
return;
}
// Check if the First IFD contains the Thumbnail tag
if ( array_key_exists( 513, $Exif_array[1] ) )
{
// Output the thumbnail
ob_end_clean ( );
header("Content-type: image/jpeg");
print $Exif_array[1][513]['Data'];
}
else
{
ob_end_clean ( );
echo "<p>Couldn't find Thumbnail Tag</p>\n";
return;
}
?>
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