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<?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;
}
}