Subversion-Projekte lars-tiefland.ci

<?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;
        }
}