Added get_dir_file_info(), get_file_info(), and get_mime_by_extension() to the File Helper.

Changed ( ! condition) into (! condition) within the code
diff --git a/system/libraries/Zip.php b/system/libraries/Zip.php
index fab8e7f..4bdc925 100644
--- a/system/libraries/Zip.php
+++ b/system/libraries/Zip.php
@@ -57,7 +57,7 @@
 	{

 		foreach ((array)$directory as $dir)

 		{

-			if ( ! preg_match("|.+/$|", $dir))

+			if (! preg_match("|.+/$|", $dir))

 			{

 				$dir .= '/';

 			}

@@ -196,7 +196,7 @@
 	 */	

 	function read_file($path, $preserve_filepath = FALSE)

 	{

-		if ( ! file_exists($path))

+		if (! file_exists($path))

 		{

 			return FALSE;

 		}

@@ -301,7 +301,7 @@
 	 */	

 	function archive($filepath)

 	{

-		if ( ! ($fp = @fopen($filepath, "wb")))

+		if (! ($fp = @fopen($filepath, "wb")))

 		{

 			return FALSE;

 		}

@@ -326,7 +326,7 @@
 	 */		

 	function download($filename = 'backup.zip')

 	{

-		if ( ! preg_match("|.+?\.zip$|", $filename))

+		if (! preg_match("|.+?\.zip$|", $filename))

 		{

 			$filename .= '.zip';

 		}