From 02fd99793fd6e33f5ac35a5a45cac6e7ee2791c9 Mon Sep 17 00:00:00 2001
From: Brion Vibber <brion@users.mediawiki.org>
Date: Wed, 26 Nov 2008 02:13:40 +0000
Subject: [PATCH] * (bug 16440) Broken 0-byte math renderings are now deleted
 and re-rendered  when page is re-parsed.

---
 RELEASE-NOTES     |  2 ++
 includes/Math.php | 10 ++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/RELEASE-NOTES b/RELEASE-NOTES
index 25b1c40f77..3addd8f649 100644
--- a/RELEASE-NOTES
+++ b/RELEASE-NOTES
@@ -366,6 +366,8 @@ The following extensions are migrated into MediaWiki 1.14:
 * (bug 7726) Searches for words less than 4 characters now work without
   requiring customization of MySQL server settings
 * Honour unchecked "Leave a redirect behind" for moved subpages
+* (bug 16440) Broken 0-byte math renderings are now deleted and re-rendered
+  when page is re-parsed.
 
 === API changes in 1.14 ===
 
diff --git a/includes/Math.php b/includes/Math.php
index ca225d6c22..090400e18b 100644
--- a/includes/Math.php
+++ b/includes/Math.php
@@ -209,8 +209,14 @@ class MathRenderer {
 			$this->html = $rpage->math_html;
 			$this->mathml = $rpage->math_mathml;
 
-			if( file_exists( $this->_getHashPath() . "/{$this->hash}.png" ) ) {
-				return true;
+			$filename = $this->_getHashPath() . "/{$this->hash}.png";
+			if( file_exists( $filename ) ) {
+				if( filesize( $filename ) == 0 ) {
+					// Some horrible error corrupted stuff :(
+					@unlink( $filename );
+				} else {
+					return true;
+				}
 			}
 
 			if( file_exists( $wgMathDirectory . "/{$this->hash}.png" ) ) {
-- 
2.20.1