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 - 2017, 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 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
 * @license     http://opensource.org/licenses/MIT      MIT License
 * @link        https://codeigniter.com
 * @since       Version 2.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Utf8 Class
 *
 * Provides support for UTF-8 environments
 *
 * @package             CodeIgniter
 * @subpackage  Libraries
 * @category    UTF-8
 * @author              EllisLab Dev Team
 * @link                https://codeigniter.com/user_guide/libraries/utf8.html
 */
class CI_Utf8 {

        /**
         * Class constructor
         *
         * Determines if UTF-8 support is to be enabled.
         *
         * @return      void
         */
        public function __construct()
        {
                if (
                        defined('PREG_BAD_UTF8_ERROR')                          // PCRE must support UTF-8
                        && (ICONV_ENABLED === TRUE OR MB_ENABLED === TRUE)      // iconv or mbstring must be installed
                        && strtoupper(config_item('charset')) === 'UTF-8'       // Application charset must be UTF-8
                        )
                {
                        define('UTF8_ENABLED', TRUE);
                        log_message('debug', 'UTF-8 Support Enabled');
                }
                else
                {
                        define('UTF8_ENABLED', FALSE);
                        log_message('debug', 'UTF-8 Support Disabled');
                }

                log_message('info', 'Utf8 Class Initialized');
        }

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

        /**
         * Clean UTF-8 strings
         *
         * Ensures strings contain only valid UTF-8 characters.
         *
         * @param       string  $str    String to clean
         * @return      string
         */
        public function clean_string($str)
        {
                if ($this->is_ascii($str) === FALSE)
                {
                        if (MB_ENABLED)
                        {
                                $str = mb_convert_encoding($str, 'UTF-8', 'UTF-8');
                        }
                        elseif (ICONV_ENABLED)
                        {
                                $str = @iconv('UTF-8', 'UTF-8//IGNORE', $str);
                        }
                }

                return $str;
        }

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

        /**
         * Remove ASCII control characters
         *
         * Removes all ASCII control characters except horizontal tabs,
         * line feeds, and carriage returns, as all others can cause
         * problems in XML.
         *
         * @param       string  $str    String to clean
         * @return      string
         */
        public function safe_ascii_for_xml($str)
        {
                return remove_invisible_characters($str, FALSE);
        }

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

        /**
         * Convert to UTF-8
         *
         * Attempts to convert a string to UTF-8.
         *
         * @param       string  $str            Input string
         * @param       string  $encoding       Input encoding
         * @return      string  $str encoded in UTF-8 or FALSE on failure
         */
        public function convert_to_utf8($str, $encoding)
        {
                if (MB_ENABLED)
                {
                        return mb_convert_encoding($str, 'UTF-8', $encoding);
                }
                elseif (ICONV_ENABLED)
                {
                        return @iconv($encoding, 'UTF-8', $str);
                }

                return FALSE;
        }

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

        /**
         * Is ASCII?
         *
         * Tests if a string is standard 7-bit ASCII or not.
         *
         * @param       string  $str    String to check
         * @return      bool
         */
        public function is_ascii($str)
        {
                return (preg_match('/[^\x00-\x7F]/S', $str) === 0);
        }

}