## redirect <2.4 thumbnails hotlinks to i.php
RewriteRule ^upload/(.*)/'.preg_quote($conf['dir_thumbnail']).'/'.preg_quote($conf['prefix_thumbnail']).'(.*)\.([a-z0-9]{3,4})$ i.php?/upload/$1/$2-th.$3 [L]
RewriteRule ^galleries/(.*)/'.preg_quote($conf['dir_thumbnail']).'/'.preg_quote($conf['prefix_thumbnail']).'(.*)\.([a-z0-9]{3,4})$ i.php?/galleries/$1/$2-th.$3 [L]

## redirect <2.4 high-def hotlinks to original file
RewriteRule ^upload/(.*)/pwg_high/(.*)\.([a-z0-9]{3,4})$ upload/$1/$2.$3 [L]
RewriteRule ^galleries/(.*)/pwg_high/(.*)\.([a-z0-9]{3,4})$ galleries/$1/$2.$3 [L]

## redirect <2.4 low-def hotlinks to i.php
RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?'.preg_quote($_SERVER['SERVER_NAME']).'/.*$ [NC]
RewriteRule ^upload/(.*)/(.*)\.([a-z0-9]{3,4})$ i.php?/upload/$1/$2-me.$3 [L]
RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?'.preg_quote($_SERVER['SERVER_NAME']).'/.*$ [NC]
RewriteRule ^galleries(.*)/(.*)\.([a-z0-9]{3,4})$ i.php?/galleries/$1/$2-me.$3 [L]