http://www.mediawiki.org/wiki/Special:Code/MediaWiki/90036

Revision: 90036
Author:   tstarling
Date:     2011-06-14 06:10:10 +0000 (Tue, 14 Jun 2011)
Log Message:
-----------
Reverted r89927 and applied a more appropriate fix for the reported hash 
mismatches.

Modified Paths:
--------------
    branches/wmf/1.17wmf1/includes/HistoryBlob.php

Modified: branches/wmf/1.17wmf1/includes/HistoryBlob.php
===================================================================
--- branches/wmf/1.17wmf1/includes/HistoryBlob.php      2011-06-14 06:07:20 UTC 
(rev 90035)
+++ branches/wmf/1.17wmf1/includes/HistoryBlob.php      2011-06-14 06:10:10 UTC 
(rev 90036)
@@ -453,13 +453,17 @@
                $header = unpack( 'Vofp/Vcsize', substr( $diff, 0, 8 ) );
                
                # Check the checksum if mhash is available
-               if ( function_exists( 'mhash' ) ) {
+               # TEMPORARY WMF PATCH -- temporarily disable hash check, since 
a large number of 
+               # revisions appear to have hash mismatches
+               /*
+               if ( extension_loaded( 'mhash' ) ) {
                        $ofp = mhash( MHASH_ADLER32, $base );
                        if ( $ofp !== substr( $diff, 0, 4 ) ) {
                                wfDebug( __METHOD__. ": incorrect base 
checksum\n" );
                                return false;
                        }
-               }
+               }*/
+               #### END WMF PATCH
                if ( $header['csize'] != strlen( $base ) ) {
                        wfDebug( __METHOD__. ": incorrect base length\n" );
                        return false;


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