Moved to PHP folder

php/system/core/Utf8.php

@@ -0,0 +1,164 @@
+<?php
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP
+ *
+ * This content is released under the MIT License (MIT)
+ *
+ * Copyright (c) 2014 - 2018, 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 - 2018, 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);
+	}
+
+}