From f38c9c29e32e86d453c820bdc13abdd9c2a1a765 Mon Sep 17 00:00:00 2001
From: Andrey Andreev <narf@devilix.net>
Date: Wed, 27 Aug 2014 14:56:31 +0300
Subject: Close #3205

---
 system/libraries/Upload.php         | 22 ++++------------------
 user_guide_src/source/changelog.rst |  1 +
 2 files changed, 5 insertions(+), 18 deletions(-)

diff --git a/system/libraries/Upload.php b/system/libraries/Upload.php
index 7946111cc..49c69a32c 100644
--- a/system/libraries/Upload.php
+++ b/system/libraries/Upload.php
@@ -1158,28 +1158,14 @@ class CI_Upload {
 	 */
 	protected function _prep_filename($filename)
 	{
-		if ($this->mod_mime_fix === FALSE OR $this->allowed_types === '*' OR strpos($filename, '.') === FALSE)
+		if ($this->mod_mime_fix === FALSE OR $this->allowed_types === '*' OR ($ext_pos = strrpos($filename, '.')) === FALSE)
 		{
 			return $filename;
 		}
 
-		$parts		= explode('.', $filename);
-		$ext		= array_pop($parts);
-		$filename	= array_shift($parts);
-
-		foreach ($parts as $part)
-		{
-			if ( ! in_array(strtolower($part), $this->allowed_types) OR ! isset($this->_mimes[strtolower($part)]))
-			{
-				$filename .= '.'.$part.'_';
-			}
-			else
-			{
-				$filename .= '.'.$part;
-			}
-		}
-
-		return $filename.'.'.$ext;
+		$ext = substr($filename, $ext_pos);
+		$filename = substr($filename, 0, $ext_pos);
+		return str_replace('.', '_', $filename).$ext;
 	}
 
 	// --------------------------------------------------------------------
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 766cb3172..5c233efac 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -306,6 +306,7 @@ Release Date: Not Released
       -  Added a ``$reset`` parameter to method ``initialize()``.
       -  Removed method ``clean_file_name()`` and its usage in favor of :doc:`Security Library <libraries/security>`'s ``sanitize_filename()``.
       -  Removed method ``mimes_types()``.
+      -  Changed ``CI_Upload::_prep_filename()`` to simply replace all (but the last) dots in the filename with underscores, instead of suffixing them.
 
    -  :doc:`Calendar Library <libraries/calendar>` changes include:
 
-- 
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