------------------------------------------------------------------------------
------------------------------------------------------------------------------
-- This file is part of 'Finite Field Arithmetic', aka 'FFA'.               --
--                                                                          --
-- (C) 2017 Stanislav Datskovskiy ( www.loper-os.org )                      --
-- http://wot.deedbot.org/17215D118B7239507FAFED98B98228A001ABFFC7.html     --
--                                                                          --
-- You do not have, nor can you ever acquire the right to use, copy or      --
-- distribute this software ; Should you use this software for any purpose, --
-- or copy and distribute it to anyone or in any manner, you are breaking   --
-- the laws of whatever soi-disant jurisdiction, and you promise to         --
-- continue doing so for the indefinite future. In any case, please         --
-- always : read and understand any software ; verify any PGP signatures    --
-- that you use - for any purpose.                                          --
--                                                                          --
-- See also http://trilema.com/2015/a-new-software-licensing-paradigm .     --
------------------------------------------------------------------------------
------------------------------------------------------------------------------

with OS;       use OS;

with FZ_Type;  use FZ_Type;


package body FFA_RNG is
   
   -- Prepare an RNG for use; at given path, or will use default
   procedure Init_RNG(RNG           : out RNG_Device;
                      RNG_Unix_Path : in  String := Default_RNG_Path) is
   begin
      begin
         -- Open the RNG at the offered path:
         Word_IO.Open(File => RNG.F,
                      Mode => Word_IO.In_File,
                      Name => RNG_Unix_Path);
      exception
         when others =>
            Eggog("Could not open RNG at : " & RNG_Unix_Path & "!");
      end;
   end Init_RNG;
   
   
   -- Fill a FZ from RNG
   procedure FZ_Random(RNG : in RNG_Device;
                       N   : out FZ) is
   begin
      begin
         -- Fill the destination FZ from this RNG:
         for i in N'Range loop
            Word_IO.Read(RNG.F, N(i));
         end loop;
      exception
         when others =>
            Eggog("Could not read from RNG!");
      end;
   end FZ_Random;
   
end FFA_RNG;