<?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 2.0
 * @filesource
 */

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

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

    /**
     * Constructor
     *
     * Determines if UTF-8 support is to be enabled
     *
     */
    function __construct() {
        log_message('debug', "Utf8 Class Initialized");

        global $CFG;

        if (preg_match('/./u', 'é') === 1                    // PCRE must support UTF-8 AND function_exists('iconv')                    // iconv must be installed AND ini_get('mbstring.func_overload') != 1        // Multibyte string function overloading cannot be enabled AND $CFG->item('charset') == 'UTF-8'            // Application charset must be UTF-8
        ) {
            log_message('debug', "UTF-8 Support Enabled");

            define('UTF8_ENABLED', TRUE);

            // set internal encoding for multibyte string functions if necessary
            // and set a flag so we don't have to repeatedly use extension_loaded()
            // or function_exists()
            if (extension_loaded('mbstring')) {
                define('MB_ENABLED', TRUE);
                mb_internal_encoding('UTF-8');
            } else {
                define('MB_ENABLED', FALSE);
            }
        } else {
            log_message('debug', "UTF-8 Support Disabled");
            define('UTF8_ENABLED', FALSE);
        }
    }

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

    /**
     * Clean UTF-8 strings
     *
     * Ensures strings are UTF-8
     *
     * @access    public
     * @param    string
     * @return    string
     */
    function clean_string($str) {
        if ($this->_is_ascii($str) === FALSE) {
            $str = @iconv('UTF-8', 'UTF-8//IGNORE', $str);
        }

        return $str;
    }

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

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

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

    /**
     * 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
     *
     * @access    public
     * @param    string
     * @return    string
     */
    function safe_ascii_for_xml($str) {
        return remove_invisible_characters($str, FALSE);
    }

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

    /**
     * Convert to UTF-8
     *
     * Attempts to convert a string to UTF-8
     *
     * @access    public
     * @param    string
     * @param    string - input encoding
     * @return    string
     */
    function convert_to_utf8($str, $encoding) {
        if (function_exists('iconv')) {
            $str = @iconv($encoding, 'UTF-8', $str);
        } elseif (function_exists('mb_convert_encoding')) {
            $str = @mb_convert_encoding($str, 'UTF-8', $encoding);
        } else {
            return FALSE;
        }

        return $str;
    }

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

}
// End Utf8 Class

/* End of file Utf8.php */
/* Location: ./system/core/Utf8.php */