+let normalize_dir s = (* append "/" if missing *)
+ let len = String.length s in
+ try
+ if s.[len - 1] = '/' then s
+ else s ^ "/"
+ with Invalid_argument _ -> (* string is empty *) "/"
+
+let strip_trailing_slash s =
+ try
+ let len = String.length s in
+ if s.[len - 1] = '/' then String.sub s 0 (len - 1)
+ else s
+ with Invalid_argument _ -> s
+
+let strip_suffix ~suffix s =
+ try
+ let s_len = String.length s in
+ let suffix_len = String.length suffix in
+ let suffix_sub = String.sub s (s_len - suffix_len) suffix_len in
+ if suffix_sub <> suffix then raise (Invalid_argument "");
+ String.sub s 0 (s_len - suffix_len)
+ with Invalid_argument _ ->
+ raise (Invalid_argument "Http_getter_misc.strip_suffix")
+
+let rec list_uniq = function
+ | [] -> []
+ | h::[] -> [h]
+ | h1::h2::tl when h1 = h2 -> list_uniq (h2 :: tl)
+ | h1::tl (* when h1 <> h2 *) -> h1 :: list_uniq tl
+
+let extension s =
+ let idx = String.rindex s '.' in
+ String.sub s idx (String.length s - idx)
+