<?php


/**


 * CodeIgniter


 *


 * An open source application development framework for PHP


 *


 * This content is released under the MIT License (MIT)


 *


 * Copyright (c) 2014 - 2019, British Columbia Institute of Technology


 *


 * Permission is hereby granted, free of charge, to any person obtaining a copy


 * of this software and associated documentation files (the "Software"), to deal


 * in the Software without restriction, including without limitation the rights


 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell


 * copies of the Software, and to permit persons to whom the Software is


 * furnished to do so, subject to the following conditions:


 *


 * The above copyright notice and this permission notice shall be included in


 * all copies or substantial portions of the Software.


 *


 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR


 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,


 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE


 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER


 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,


 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN


 * THE SOFTWARE.


 *


 * @package	CodeIgniter


 * @author	EllisLab Dev Team


 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)


 * @copyright	Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)


 * @license	https://opensource.org/licenses/MIT	MIT License


 * @link	https://codeigniter.com


 * @since	Version 1.0.0


 * @filesource


 */


defined('BASEPATH') OR exit('No direct script access allowed');





/**


 * CodeIgniter Download Helpers


 *


 * @package		CodeIgniter


 * @subpackage	Helpers


 * @category	Helpers


 * @author		EllisLab Dev Team


 * @link		https://codeigniter.com/user_guide/helpers/download_helper.html


 */





// ------------------------------------------------------------------------





if ( ! function_exists('force_download'))


{


	/**


	 * Force Download


	 *


	 * Generates headers that force a download to happen


	 *


	 * @param	string	filename


	 * @param	mixed	the data to be downloaded


	 * @param	bool	whether to try and send the actual file MIME type


	 * @return	void


	 */


	function force_download($filename = '', $data = '', $set_mime = FALSE)


	{


		if ($filename === '' OR $data === '')


		{


			return;


		}


		elseif ($data === NULL)


		{


			if ( ! @is_file($filename) OR ($filesize = @filesize($filename)) === FALSE)


			{


				return;


			}





			$filepath = $filename;


			$filename = explode('/', str_replace(DIRECTORY_SEPARATOR, '/', $filename));


			$filename = end($filename);


		}


		else


		{


			$filesize = strlen($data);


		}





		// Set the default MIME type to send


		$mime = 'application/octet-stream';





		$x = explode('.', $filename);


		$extension = end($x);





		if ($set_mime === TRUE)


		{


			if (count($x) === 1 OR $extension === '')


			{


				/* If we're going to detect the MIME type,


				 * we'll need a file extension.


				 */


				return;


			}





			// Load the mime types


			$mimes =& get_mimes();





			// Only change the default MIME if we can find one


			if (isset($mimes[$extension]))


			{


				$mime = is_array($mimes[$extension]) ? $mimes[$extension][0] : $mimes[$extension];


			}


		}





		/* It was reported that browsers on Android 2.1 (and possibly older as well)


		 * need to have the filename extension upper-cased in order to be able to


		 * download it.


		 *


		 * Reference: http://digiblog.de/2011/04/19/android-and-the-download-file-headers/


		 */


		if (count($x) !== 1 && isset($_SERVER['HTTP_USER_AGENT']) && preg_match('/Android\s(1|2\.[01])/', $_SERVER['HTTP_USER_AGENT']))


		{


			$x[count($x) - 1] = strtoupper($extension);


			$filename = implode('.', $x);


		}





		if ($data === NULL && ($fp = @fopen($filepath, 'rb')) === FALSE)


		{


			return;


		}





		// Clean output buffer


		if (ob_get_level() !== 0 && @ob_end_clean() === FALSE)


		{


			@ob_clean();


		}





		// Generate the server headers


		header('Content-Type: '.$mime);


		header('Content-Disposition: attachment; filename="'.$filename.'"');


		header('Expires: 0');


		header('Content-Transfer-Encoding: binary');


		header('Content-Length: '.$filesize);


		header('Cache-Control: private, no-transform, no-store, must-revalidate');





		// If we have raw data - just dump it


		if ($data !== NULL)


		{


			exit($data);


		}





		// Flush 1MB chunks of data


		while ( ! feof($fp) && ($data = fread($fp, 1048576)) !== FALSE)


		{


			echo $data;


		}





		fclose($fp);


		exit;


	}


}


