<?php

/**
 * $Id:$
 *
 * KnowledgeTree Open Source Edition
 * Document Management Made Simple
 * Copyright (C) 2004 - 2007 The Jam Warehouse Software (Pty) Limited
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 3 as published by the
 * Free Software Foundation.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * You can contact The Jam Warehouse Software (Pty) Limited, Unit 1, Tramber Place,
 * Blake Street, Observatory, 7925 South Africa. or email info@knowledgetree.com.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "Powered by
 * KnowledgeTree" logo and retain the original copyright notice. If the display of the
 * logo is not reasonably feasible for technical reasons, the Appropriate Legal Notices
 * must display the words "Powered by KnowledgeTree" and retain the original
 * copyright notice.
 * Contributor( s): ______________________________________
 *
 */

class ExifExtractor extends DocumentExtractor
{
	public function getDisplayName()
	{
		return _kt('Exif Extractor');
	}

	public function getSupportedMimeTypes()
	{
		return array(
			'image/tiff',
			'image/jpeg'
		);
	}

	public function extractTextContent()
	{
		$exif = exif_read_data($this->sourcefile, 0, true);
		$content = '';
		foreach ($exif as $key => $section)
		{
			foreach ($section as $name => $val)
			{
				if (is_numeric($val))
				{
					// no point indexing numeric content. it will be ignored anyways!
					continue;
				}
				if ($key =='FILE' && in_array($name, array('MimeType', 'SectionsFound')))
				{
					continue;
				}

				$content .= "$val\n";
			}
		}

		$result = file_put_contents($this->targetfile, $content);

		return false !== $result;
	}

	public function diagnose()
	{
		if (!function_exists('exif_read_data'))
		{
			return sprintf(_kt('The Exif extractor requires the module exif php extension. Please include this in the php.ini.'));
		}

		return null;
	}
}

?>