(*

 * ExtLib Testing Suite

 * Copyright (C) 2004 Janne Hellsten

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version,

 * with the special exception on linking described in file LICENSE.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *)

let in_range c a b = 

  let i = int_of_char c 

  and ai = int_of_char a 

  and bi = int_of_char b in

  (i >= ai && i <= bi)

let check_chars s =

  let len = String.length s in

  if len > 0 then

    begin

      for i = 0 to len-1 do

        let c = s.[i] in

        if not (in_range c 'A' 'Z') then

          if not (in_range c 'a' 'z') then

            if not (in_range c '0' '9') then

              assert (c = '/' || c = '+')

      done

    end

let () =

  Util.register1 "Base64" "random"

    (fun () -> 

       for i = 0 to 64 do

         let s = Util.random_string () in

         let enc = Base64.encode_string s in

         assert ((Base64.decode_string enc) = s);

         check_chars enc

       done)