RewriteEngine on
RewriteCond %{HTTP_REFERER} google\.com
RewriteRule .* - [F]
RewriteCond %{HTTP_USER_AGENT} ^googlebot 
RewriteRule ^.* - [F,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*) index.php?xwi=$1 [QSA]