[eluser]flaky[/eluser]
As you can see from the code below (download_helper.php), CodeIgniter uses php to set the headers, it doesn't have it's own set of complicated functions, but basically uses php's functions.
Code:
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 4.3.2 or newer
*
* @package CodeIgniter
* @author ExpressionEngine Dev Team
* @copyright Copyright (c) 2008 - 2009, EllisLab, Inc.
* @license http://ellislab.com/codeigniter/user-guide/license.html
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* CodeIgniter Download Helpers
*
* @package CodeIgniter
* @subpackage Helpers
* @category Helpers
* @author ExpressionEngine Dev Team
* @link http://ellislab.com/codeigniter/user-guide/helpers/download_helper.html
*/
// ------------------------------------------------------------------------
/**
* Force Download
*
* Generates headers that force a download to happen
*
* @access public
* @param string filename
* @param mixed the data to be downloaded
* @return void
*/
if ( ! function_exists('force_download'))
{
function force_download($filename = '', $data = '')
{
if ($filename == '' OR $data == '')
{
return FALSE;
}
// Try to determine if the filename includes a file extension.
// We need it in order to set the MIME type
if (FALSE === strpos($filename, '.'))
{
return FALSE;
}
// Grab the file extension
$x = explode('.', $filename);
$extension = end($x);
// Load the mime types
@include(APPPATH.'config/mimes'.EXT);
// Set a default mime if we can't find it
if ( ! isset($mimes[$extension]))
{
$mime = 'application/octet-stream';
}
else
{
$mime = (is_array($mimes[$extension])) ? $mimes[$extension][0] : $mimes[$extension];
}
// Generate the server headers
if (strstr($_SERVER['HTTP_USER_AGENT'], "MSIE"))
{
header('Content-Type: "'.$mime.'"');
header('Content-Disposition: attachment; filename="'.$filename.'"');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header("Content-Transfer-Encoding: binary");
header('Pragma: public');
header("Content-Length: ".strlen($data));
}
else
{
header('Content-Type: "'.$mime.'"');
header('Content-Disposition: attachment; filename="'.$filename.'"');
header("Content-Transfer-Encoding: binary");
header('Expires: 0');
header('Pragma: no-cache');
header("Content-Length: ".strlen($data));
}
exit($data);
}
}
/* End of file download_helper.php */
/* Location: ./system/helpers/download_helper.php */
