From: Tim Starling <tstarling@users.mediawiki.org>
Date: Fri, 17 Feb 2012 00:28:17 +0000 (+0000)
Subject: Clarified comment per CR r111701
X-Git-Tag: 1.31.0-rc.0~24658
X-Git-Url: http://git.cyclocoop.org/%7B%24admin_url%7Dmembres/modifier.php?a=commitdiff_plain;h=346181cce14dda680eefeda3a42e789d0bf297df;p=lhc%2Fweb%2Fwiklou.git

Clarified comment per CR r111701
---

diff --git a/includes/HistoryBlob.php b/includes/HistoryBlob.php
index 7887ff85d9..9e63791f8d 100644
--- a/includes/HistoryBlob.php
+++ b/includes/HistoryBlob.php
@@ -567,10 +567,11 @@ class DiffHistoryBlob implements HistoryBlob {
 	function xdiffAdler32( $s ) {
 		static $init;
 		if ( $init === null ) {
-			// The real Adler-32 checksum of this string is zero, so it 
-			// initialises the state to the LibXDiff initial value.
 			$init = str_repeat( "\xf0", 205 ) . "\xee" . str_repeat( "\xf0", 67 ) . "\x02";
 		}
+		// The real Adler-32 checksum of $init is zero, so it initialises the 
+		// state to zero, as it is at the start of LibXDiff's checksum 
+		// algorithm. Appending the subject string then simulates LibXDiff.
 		if ( function_exists( 'hash' ) ) {
 			$hash = hash( 'adler32', $init . $s, true );
 		} elseif ( function_exists( 'mhash' ) ) {