$dhb = new DiffHistoryBlob;
$myHash = $dhb->xdiffAdler32( $input );
$this->assertSame( bin2hex( $xdiffHash ), bin2hex( $myHash ),
$dhb = new DiffHistoryBlob;
$myHash = $dhb->xdiffAdler32( $input );
$this->assertSame( bin2hex( $xdiffHash ), bin2hex( $myHash ),