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[lhc/web/wiklou.git] / includes / HistoryBlob.php

diff --git a/includes/HistoryBlob.php b/includes/HistoryBlob.php
index 1af733a..31aa0f8 100644 (file)
--- a/includes/HistoryBlob.php
+++ b/includes/HistoryBlob.php
@@ -143,7 +143,7 @@ class ConcatenatedGzipHistoryBlob implements HistoryBlob
         * Compress the bulk data in the object
         */
        public function compress() {
-               if ( !$this->mCompressed  ) {
+               if ( !$this->mCompressed ) {
                        $this->mItems = gzdeflate( serialize( $this->mItems ) );
                        $this->mCompressed = true;
                }
@@ -231,16 +231,16 @@ class HistoryBlobStub {
         * @return string
         */
        function getText() {
-               if( isset( self::$blobCache[$this->mOldId] ) ) {
+               if ( isset( self::$blobCache[$this->mOldId] ) ) {
                        $obj = self::$blobCache[$this->mOldId];
                } else {
                        $dbr = wfGetDB( DB_SLAVE );
                        $row = $dbr->selectRow( 'text', array( 'old_flags', 'old_text' ), array( 'old_id' => $this->mOldId ) );
-                       if( !$row ) {
+                       if ( !$row ) {
                                return false;
                        }
                        $flags = explode( ',', $row->old_flags );
-                       if( in_array( 'external', $flags ) ) {
+                       if ( in_array( 'external', $flags ) ) {
                                $url = $row->old_text;
                                $parts = explode( '://', $url, 2 );
                                if ( !isset( $parts[1] ) || $parts[1] == '' ) {
@@ -249,11 +249,11 @@ class HistoryBlobStub {
                                $row->old_text = ExternalStore::fetchFromUrl( $url );
 
                        }
-                       if( !in_array( 'object', $flags ) ) {
+                       if ( !in_array( 'object', $flags ) ) {
                                return false;
                        }
 
-                       if( in_array( 'gzip', $flags ) ) {
+                       if ( in_array( 'gzip', $flags ) ) {
                                // This shouldn't happen, but a bug in the compress script
                                // may at times gzip-compress a HistoryBlob object row.
                                $obj = unserialize( gzinflate( $row->old_text ) );
@@ -261,7 +261,7 @@ class HistoryBlobStub {
                                $obj = unserialize( $row->old_text );
                        }
 
-                       if( !is_object( $obj ) ) {
+                       if ( !is_object( $obj ) ) {
                                // Correct for old double-serialization bug.
                                $obj = unserialize( $obj );
                        }
@@ -318,7 +318,7 @@ class HistoryBlobCurStub {
        function getText() {
                $dbr = wfGetDB( DB_SLAVE );
                $row = $dbr->selectRow( 'cur', array( 'cur_text' ), array( 'cur_id' => $this->mCurId ) );
-               if( !$row ) {
+               if ( !$row ) {
                        return false;
                }
                return $row->cur_text;
@@ -530,7 +530,7 @@ class DiffHistoryBlob implements HistoryBlob {
 
                $header = unpack( 'Vofp/Vcsize', substr( $diff, 0, 8 ) );
 
-               # Check the checksum if hash/mhash is available
+               # Check the checksum if hash extension is available
                $ofp = $this->xdiffAdler32( $base );
                if ( $ofp !== false && $ofp !== substr( $diff, 0, 4 ) ) {
                        wfDebug( __METHOD__ . ": incorrect base checksum\n" );
@@ -577,24 +577,23 @@ class DiffHistoryBlob implements HistoryBlob {
         * Compute a binary "Adler-32" checksum as defined by LibXDiff, i.e. with
         * the bytes backwards and initialised with 0 instead of 1. See bug 34428.
         *
-        * Returns false if no hashing library is available
+        * @param string $s
+        * @return string|bool: false if the hash extension is not available
         */
        function xdiffAdler32( $s ) {
+               if ( !function_exists( 'hash' ) ) {
+                       return false;
+               }
+
                static $init;
                if ( $init === null ) {
                        $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' ) ) {
-                       $hash = mhash( MHASH_ADLER32, $init . $s );
-               } else {
-                       return false;
-               }
-               return strrev( $hash );
+               return strrev( hash( 'adler32', $init . $s, true ) );
        }
 
        function uncompress() {