update to CI 2.0

Signed-off-by: Florian Pritz <bluewind@server-speed.net>

1 files changed, 503 insertions, 0 deletions

diff --git a/system/core/Common.php b/system/core/Common.php
new file mode 100755
index 000000000..b5adfacb3
--- /dev/null
+++ b/system/core/Common.php
@@ -0,0 +1,503 @@
+<?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 1.0
+ * @filesource
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * Common Functions
+ *
+ * Loads the base classes and executes the request.
+ *
+ * @package		CodeIgniter
+ * @subpackage	codeigniter
+ * @category	Common Functions
+ * @author		ExpressionEngine Dev Team
+ * @link		http://codeigniter.com/user_guide/
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+* Determines if the current version of PHP is greater then the supplied value
+*
+* Since there are a few places where we conditionally test for PHP > 5
+* we'll set a static variable.
+*
+* @access	public
+* @param	string
+* @return	bool	TRUE if the current version is $version or higher
+*/
+	function is_php($version = '5.0.0')
+	{
+		static $_is_php;
+		$version = (string)$version;
+
+		if ( ! isset($_is_php[$version]))
+		{
+			$_is_php[$version] = (version_compare(PHP_VERSION, $version) < 0) ? FALSE : TRUE;
+		}
+
+		return $_is_php[$version];
+	}
+
+// ------------------------------------------------------------------------
+
+/**
+ * Tests for file writability
+ *
+ * is_writable() returns TRUE on Windows servers when you really can't write to
+ * the file, based on the read-only attribute.  is_writable() is also unreliable
+ * on Unix servers if safe_mode is on.
+ *
+ * @access	private
+ * @return	void
+ */
+	function is_really_writable($file)
+	{
+		// If we're on a Unix server with safe_mode off we call is_writable
+		if (DIRECTORY_SEPARATOR == '/' AND @ini_get("safe_mode") == FALSE)
+		{
+			return is_writable($file);
+		}
+
+		// For windows servers and safe_mode "on" installations we'll actually
+		// write a file then read it.  Bah...
+		if (is_dir($file))
+		{
+			$file = rtrim($file, '/').'/'.md5(mt_rand(1,100).mt_rand(1,100));
+
+			if (($fp = @fopen($file, FOPEN_WRITE_CREATE)) === FALSE)
+			{
+				return FALSE;
+			}
+
+			fclose($fp);
+			@chmod($file, DIR_WRITE_MODE);
+			@unlink($file);
+			return TRUE;
+		}
+		elseif (($fp = @fopen($file, FOPEN_WRITE_CREATE)) === FALSE)
+		{
+			return FALSE;
+		}
+
+		fclose($fp);
+		return TRUE;
+	}
+
+// ------------------------------------------------------------------------
+
+/**
+* Class registry
+*
+* This function acts as a singleton.  If the requested class does not
+* exist it is instantiated and set to a static variable.  If it has
+* previously been instantiated the variable is returned.
+*
+* @access	public
+* @param	string	the class name being requested
+* @param	string	the directory where the class should be found
+* @param	string	the class name prefix
+* @return	object
+*/
+	function &load_class($class, $directory = 'libraries', $prefix = 'CI_')
+	{
+		static $_classes = array();
+
+		// Does the class exist?  If so, we're done...
+		if (isset($_classes[$class]))
+		{
+			return $_classes[$class];
+		}
+
+		$name = FALSE;
+
+		// Look for the class first in the native system/libraries folder
+		// thenin the local application/libraries folder
+		foreach (array(BASEPATH, APPPATH) as $path)
+		{
+			if (file_exists($path.$directory.'/'.$class.EXT))
+			{
+				$name = $prefix.$class;
+
+				if (class_exists($name) === FALSE)
+				{
+					require($path.$directory.'/'.$class.EXT);
+				}
+
+				break;
+			}
+		}
+
+		// Is the request a class extension?  If so we load it too
+		if (file_exists(APPPATH.$directory.'/'.config_item('subclass_prefix').$class.EXT))
+		{
+			$name = config_item('subclass_prefix').$class;
+
+			if (class_exists($name) === FALSE)
+			{
+				require(APPPATH.$directory.'/'.config_item('subclass_prefix').$class.EXT);
+			}
+		}
+
+		// Did we find the class?
+		if ($name === FALSE)
+		{
+			// Note: We use exit() rather then show_error() in order to avoid a
+			// self-referencing loop with the Excptions class
+			exit('Unable to locate the specified class: '.$class.EXT);
+		}
+
+		// Keep track of what we just loaded
+		is_loaded($class);
+
+		$_classes[$class] = new $name();
+		return $_classes[$class];
+	}
+
+// --------------------------------------------------------------------
+
+/**
+* Keeps track of which libraries have been loaded.  This function is
+* called by the load_class() function above
+*
+* @access	public
+* @return	array
+*/
+	function is_loaded($class = '')
+	{
+		static $_is_loaded = array();
+
+		if ($class != '')
+		{
+			$_is_loaded[strtolower($class)] = $class;
+		}
+
+		return $_is_loaded;
+	}
+
+// ------------------------------------------------------------------------
+
+/**
+* Loads the main config.php file
+*
+* This function lets us grab the config file even if the Config class
+* hasn't been instantiated yet
+*
+* @access	private
+* @return	array
+*/
+	function &get_config($replace = array())
+	{
+		static $_config;
+
+		if (isset($_config))
+		{
+			return $_config[0];
+		}
+
+		// Fetch the config file
+		if ( ! file_exists(APPPATH.'config/config'.EXT))
+		{
+			exit('The configuration file does not exist.');
+		}
+		else
+		{
+			require(APPPATH.'config/config'.EXT);
+		}
+
+		// Does the $config array exist in the file?
+		if ( ! isset($config) OR ! is_array($config))
+		{
+			exit('Your config file does not appear to be formatted correctly.');
+		}
+
+		// Are any values being dynamically replaced?
+		if (count($replace) > 0)
+		{
+			foreach ($replace as $key => $val)
+			{
+				if (isset($config[$key]))
+				{
+					$config[$key] = $val;
+				}
+			}
+		}
+
+		return $_config[0] =& $config;
+	}
+
+// ------------------------------------------------------------------------
+
+/**
+* Returns the specified config item
+*
+* @access	public
+* @return	mixed
+*/
+	function config_item($item)
+	{
+		static $_config_item = array();
+
+		if ( ! isset($_config_item[$item]))
+		{
+			$config =& get_config();
+
+			if ( ! isset($config[$item]))
+			{
+				return FALSE;
+			}
+			$_config_item[$item] = $config[$item];
+		}
+
+		return $_config_item[$item];
+	}
+
+// ------------------------------------------------------------------------
+
+/**
+* Error Handler
+*
+* This function lets us invoke the exception class and
+* display errors using the standard error template located
+* in application/errors/errors.php
+* This function will send the error page directly to the
+* browser and exit.
+*
+* @access	public
+* @return	void
+*/
+	function show_error($message, $status_code = 500, $heading = 'An Error Was Encountered')
+	{
+		$_error =& load_class('Exceptions', 'core');
+		echo $_error->show_error($heading, $message, 'error_general', $status_code);
+		exit;
+	}
+
+// ------------------------------------------------------------------------
+
+/**
+* 404 Page Handler
+*
+* This function is similar to the show_error() function above
+* However, instead of the standard error template it displays
+* 404 errors.
+*
+* @access	public
+* @return	void
+*/
+	function show_404($page = '', $log_error = TRUE)
+	{
+		$_error =& load_class('Exceptions', 'core');
+		$_error->show_404($page, $log_error);
+		exit;
+	}
+
+// ------------------------------------------------------------------------
+
+/**
+* Error Logging Interface
+*
+* We use this as a simple mechanism to access the logging
+* class and send messages to be logged.
+*
+* @access	public
+* @return	void
+*/
+	function log_message($level = 'error', $message, $php_error = FALSE)
+	{
+		static $_log;
+
+		if (config_item('log_threshold') == 0)
+		{
+			return;
+		}
+
+		$_log =& load_class('Log');
+		$_log->write_log($level, $message, $php_error);
+	}
+
+// ------------------------------------------------------------------------
+
+/**
+ * Set HTTP Status Header
+ *
+ * @access	public
+ * @param	int		the status code
+ * @param	string
+ * @return	void
+ */
+	function set_status_header($code = 200, $text = '')
+	{
+		$stati = array(
+							200	=> 'OK',
+							201	=> 'Created',
+							202	=> 'Accepted',
+							203	=> 'Non-Authoritative Information',
+							204	=> 'No Content',
+							205	=> 'Reset Content',
+							206	=> 'Partial Content',
+
+							300	=> 'Multiple Choices',
+							301	=> 'Moved Permanently',
+							302	=> 'Found',
+							304	=> 'Not Modified',
+							305	=> 'Use Proxy',
+							307	=> 'Temporary Redirect',
+
+							400	=> 'Bad Request',
+							401	=> 'Unauthorized',
+							403	=> 'Forbidden',
+							404	=> 'Not Found',
+							405	=> 'Method Not Allowed',
+							406	=> 'Not Acceptable',
+							407	=> 'Proxy Authentication Required',
+							408	=> 'Request Timeout',
+							409	=> 'Conflict',
+							410	=> 'Gone',
+							411	=> 'Length Required',
+							412	=> 'Precondition Failed',
+							413	=> 'Request Entity Too Large',
+							414	=> 'Request-URI Too Long',
+							415	=> 'Unsupported Media Type',
+							416	=> 'Requested Range Not Satisfiable',
+							417	=> 'Expectation Failed',
+
+							500	=> 'Internal Server Error',
+							501	=> 'Not Implemented',
+							502	=> 'Bad Gateway',
+							503	=> 'Service Unavailable',
+							504	=> 'Gateway Timeout',
+							505	=> 'HTTP Version Not Supported'
+						);
+
+		if ($code == '' OR ! is_numeric($code))
+		{
+			show_error('Status codes must be numeric', 500);
+		}
+
+		if (isset($stati[$code]) AND $text == '')
+		{
+			$text = $stati[$code];
+		}
+
+		if ($text == '')
+		{
+			show_error('No status text available.  Please check your status code number or supply your own message text.', 500);
+		}
+
+		$server_protocol = (isset($_SERVER['SERVER_PROTOCOL'])) ? $_SERVER['SERVER_PROTOCOL'] : FALSE;
+
+		if (substr(php_sapi_name(), 0, 3) == 'cgi')
+		{
+			header("Status: {$code} {$text}", TRUE);
+		}
+		elseif ($server_protocol == 'HTTP/1.1' OR $server_protocol == 'HTTP/1.0')
+		{
+			header($server_protocol." {$code} {$text}", TRUE, $code);
+		}
+		else
+		{
+			header("HTTP/1.1 {$code} {$text}", TRUE, $code);
+		}
+	}
+
+// --------------------------------------------------------------------
+
+/**
+* Exception Handler
+*
+* This is the custom exception handler that is declaired at the top
+* of Codeigniter.php.  The main reason we use this is to permit
+* PHP errors to be logged in our own log files since the user may
+* not have access to server logs. Since this function
+* effectively intercepts PHP errors, however, we also need
+* to display errors based on the current error_reporting level.
+* We do that with the use of a PHP error template.
+*
+* @access	private
+* @return	void
+*/
+	function _exception_handler($severity, $message, $filepath, $line)
+	{
+		 // We don't bother with "strict" notices since they tend to fill up
+		 // the log file with excess information that isn't normally very helpful.
+		 // For example, if you are running PHP 5 and you use version 4 style
+		 // class functions (without prefixes like "public", "private", etc.)
+		 // you'll get notices telling you that these have been deprecated.
+		if ($severity == E_STRICT)
+		{
+			return;
+		}
+
+		$_error =& load_class('Exceptions', 'core');
+
+		// Should we display the error? We'll get the current error_reporting
+		// level and add its bits with the severity bits to find out.
+		if (($severity & error_reporting()) == $severity)
+		{
+			$_error->show_php_error($severity, $message, $filepath, $line);
+		}
+
+		// Should we log the error?  No?  We're done...
+		if (config_item('log_threshold') == 0)
+		{
+			return;
+		}
+
+		$_error->log_exception($severity, $message, $filepath, $line);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Remove Invisible Characters
+	 *
+	 * This prevents sandwiching null characters
+	 * between ascii characters, like Java\0script.
+	 *
+	 * @access	public
+	 * @param	string
+	 * @return	string
+	 */
+	function remove_invisible_characters($str)
+	{
+		static $non_displayables;
+
+		if ( ! isset($non_displayables))
+		{
+			// every control character except newline (dec 10), carriage return (dec 13), and horizontal tab (dec 09),
+			$non_displayables = array(
+										'/%0[0-8bcef]/',			// url encoded 00-08, 11, 12, 14, 15
+										'/%1[0-9a-f]/',				// url encoded 16-31
+										'/[\x00-\x08]/',			// 00-08
+										'/\x0b/', '/\x0c/',			// 11, 12
+										'/[\x0e-\x1f]/'				// 14-31
+									);
+		}
+
+		do
+		{
+			$cleaned = $str;
+			$str = preg_replace($non_displayables, '', $str);
+		}
+		while ($cleaned != $str);
+
+		return $str;
+	}
+
+
+/* End of file Common.php */
+/* Location: ./system/core/Common.php */
\ No newline at end of file