adding some fopen constants
diff --git a/system/application/config/constants.php b/system/application/config/constants.php
index ace3f8b..3909941 100644
--- a/system/application/config/constants.php
+++ b/system/application/config/constants.php
@@ -18,4 +18,20 @@
define('DIR_READ_MODE', 0755);
define('DIR_WRITE_MODE', 0777);
+/*
+|--------------------------------------------------------------------------
+| File Stream Modes
+|--------------------------------------------------------------------------
+|
+| These modes are used when working with fopen()/popen()
+|
+*/
+define('FOPEN_READ_BOF', 'rb');
+define('FOPEN_READ_WRITE_BOF', 'r+b');
+define('FOPEN_WRITE_CREATE_BOF', 'wb'); // truncates existing file data, use with care
+define('FOPEN_READ_WRITE_CREATE_BOF', 'w+b'); // truncates existing file data, use with care
+define('FOPEN_WRITE_CREATE_EOF', 'ab');
+define('FOPEN_READ_WRITE_CREATE_EOF', 'a+b');
+define('FOPEN_WRITE_CREATE_STRICT', 'xb');
+define('FOPEN_READ_WRITE_CREATE_STRICT','x+b');
?>
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