moving core library files out of libraries into new core folder

1 files changed, 421 insertions, 0 deletions

diff --git a/system/core/Common.php b/system/core/Common.php
new file mode 100644
index 000000000..9a35062a4
--- /dev/null
+++ b/system/core/Common.php
@@ -0,0 +1,421 @@
+<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 4.3.2 or newer
+ *
+ * @package		CodeIgniter
+ * @author		ExpressionEngine Dev Team
+ * @copyright	Copyright (c) 2008 - 2010, EllisLab, Inc.
+ * @license		http://codeigniter.com/user_guide/license.html
+ * @link		http://codeigniter.com
+ * @since		Version 1.0
+ * @filesource
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+* 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
+*/
+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	bool	optional flag that lets classes get loaded but not instantiated
+* @return	object
+*/
+function &load_class($class, $instantiate = TRUE)
+{
+	static $objects = array();
+
+	// Does the class exist?  If so, we're done...
+	if (isset($objects[$class]))
+	{
+		return $objects[$class];
+	}
+
+	// If the requested class does not exist in the application/libraries
+	// folder we'll load the native class from the system/libraries folder.	
+	if (file_exists(APPPATH.'libraries/'.config_item('subclass_prefix').$class.EXT))
+	{
+		require(BASEPATH.'libraries/'.$class.EXT);
+		require(APPPATH.'libraries/'.config_item('subclass_prefix').$class.EXT);
+		$is_subclass = TRUE;
+	}
+	else
+	{
+		if (file_exists(APPPATH.'libraries/'.$class.EXT))
+		{
+			require(APPPATH.'libraries/'.$class.EXT);
+			$is_subclass = FALSE;
+		}
+		else
+		{
+			require(BASEPATH.'libraries/'.$class.EXT);
+			$is_subclass = FALSE;
+		}
+	}
+
+	if ($instantiate == FALSE)
+	{
+		$objects[$class] = TRUE;
+		return $objects[$class];
+	}
+
+	if ($is_subclass == TRUE)
+	{
+		$name = config_item('subclass_prefix').$class;
+
+		$objects[$class] =& instantiate_class(new $name());
+		return $objects[$class];
+	}
+
+	$name = ($class != 'Controller') ? 'CI_'.$class : $class;
+
+	$objects[$class] =& instantiate_class(new $name());
+	return $objects[$class];
+}
+
+/**
+ * Instantiate Class
+ *
+ * Returns a new class object by reference, used by load_class() and the DB class.
+ * Required to retain PHP 4 compatibility and also not make PHP 5.3 cry.
+ *
+ * Use: $obj =& instantiate_class(new Foo());
+ * 
+ * @access	public
+ * @param	object
+ * @return	object
+ */
+function &instantiate_class(&$class_object)
+{
+	return $class_object;
+}
+
+/**
+* Loads the main config.php file
+*
+* @access	private
+* @return	array
+*/
+function &get_config()
+{
+	static $main_conf;
+
+	if ( ! isset($main_conf))
+	{
+		if ( ! file_exists(APPPATH.'config/config'.EXT))
+		{
+			exit('The configuration file config'.EXT.' does not exist.');
+		}
+
+		require(APPPATH.'config/config'.EXT);
+
+		if ( ! isset($config) OR ! is_array($config))
+		{
+			exit('Your config file does not appear to be formatted correctly.');
+		}
+
+		$main_conf[0] =& $config;
+	}
+	return $main_conf[0];
+}
+
+/**
+* Gets a config item
+*
+* @access	public
+* @return	mixed
+*/
+function config_item($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)
+{
+	$error =& load_class('Exceptions');
+	echo $error->show_error('An Error Was Encountered', $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 = '')
+{
+	$error =& load_class('Exceptions');
+	$error->show_404($page);
+	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;
+	
+	$config =& get_config();
+	if ($config['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, $code);
+	}
+}
+
+
+/**
+* Exception Handler
+*
+* This is the custom exception handler that is declaired at the top
+* of Codeigniter.php.  The main reason we use this is permit
+* PHP errors to be logged in our own log files since we may
+* not have access to server logs. Since this function
+* effectively intercepts PHP errors, however, we also need
+* to display errors based on the current error_reporting level.
+* We do that with the use of a PHP error template.
+*
+* @access	private
+* @return	void
+*/
+function _exception_handler($severity, $message, $filepath, $line)
+{	
+	 // We don't bother with "strict" notices since they will fill up
+	 // the log file with information that isn't normally very
+	 // helpful.  For example, if you are running PHP 5 and you
+	 // use version 4 style class functions (without prefixes
+	 // like "public", "private", etc.) you'll get notices telling
+	 // you that these have been deprecated.
+	
+	if ($severity == E_STRICT)
+	{
+		return;
+	}
+
+	$error =& load_class('Exceptions');
+
+	// Should we display the error?
+	// We'll get the current error_reporting level and add its bits
+	// with the severity bits to find out.
+	
+	if (($severity & error_reporting()) == $severity)
+	{
+		$error->show_php_error($severity, $message, $filepath, $line);
+	}
+	
+	// Should we log the error?  No?  We're done...
+	$config =& get_config();
+	if ($config['log_threshold'] == 0)
+	{
+		return;
+	}
+
+	$error->log_exception($severity, $message, $filepath, $line);
+}
+
+
+
+/* End of file Common.php */
+/* Location: ./system/codeigniter/Common.php */
\ No newline at end of file