source: pro-violet-viettel/sourcecode/system/helpers/download_helper.php

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package             CodeIgniter
 * @author              ExpressionEngine Dev Team
 * @copyright   Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license             http://codeigniter.com/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://codeigniter.com/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
                if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'))
                {
                        include(APPPATH.'config/'.ENVIRONMENT.'/mimes.php');
                }
                elseif (is_file(APPPATH.'config/mimes.php'))
                {
                        include(APPPATH.'config/mimes.php');
                }

                // 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 (strpos($_SERVER['HTTP_USER_AGENT'], "MSIE") !== FALSE)
                {
                        header('Content-Type: "'.$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 */