<?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;

	}



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



	/**

	 * 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;

	}



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



	/**

	 * 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);

	}



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



}

// End Utf8 Class



/* End of file Utf8.php */

/* Location: ./system/core/Utf8.php */