MimeMagic: Prevent PHP warning when trying to read zero bytes

Honestly, there's no reason why fread() should warn when asked to read
zero bytes. It should just return zero bytes of content. Eh, PHP.

Bug: T130813
Change-Id: I56c4826759390bdbf6af04da28e2d9ed07781bca

diff --git a/includes/MimeMagic.php b/includes/MimeMagic.php
index aedfd8f..a432d44 100644 (file)
--- a/includes/MimeMagic.php
+++ b/includes/MimeMagic.php
@@ -645,7 +645,7 @@ class MimeMagic {
                        throw new MWException(
                                "Seeking $tailLength bytes from EOF failed in " . __METHOD__ );
                }
-               $tail = fread( $f, $tailLength );
+               $tail = $tailLength ? fread( $f, $tailLength ) : '';
                fclose( $f );
 
                wfDebug( __METHOD__ . ": analyzing head and tail of $file for magic numbers.\n" );