File : acf-types-base32.adb
------------------------------------------------------------------------------
-- ADAGIO - ADALID - AENEA. --
-- --
-- Copyright (C) 2003 --
-- A. Mosteo. --
-- --
-- Authors: A. Mosteo. (adagio@mosteo.com) --
-- --
-- If you have any questions in regard to this software, please address --
-- them to the above email. --
-- --
-- This program is free software; you can redistribute it and/or modify --
-- it under the terms of the GNU General Public License as published by --
-- the Free Software Foundation; either version 2 of the License, or (at --
-- your option) any later version. --
-- --
-- This program 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 --
-- General Public License for more details. --
-- --
-- You should have received a copy of the GNU 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. --
-- --
-- You are not allowed to use any part of this code to develop a program --
-- whose output would be used to harass or prosecute other users of the --
-- networks Adagio connects with. All data collected with Adagio or a tool --
-- containing Adagio code about other network users must remain --
-- confidential and cannot be made public by any mean, nor be used to --
-- harass or legally prosecute these users. --
------------------------------------------------------------------------------
-- $Id: acf-types-base32.adb,v 1.3 2004/01/21 21:05:40 Jano Exp $
with Bit_arrays;
with Bit_arrays.Modular;
with Bit_arrays.Numbers;
package body Acf.Types.Base32 is
package Byte_bit is new Bit_arrays.Modular (Byte);
function To_base32 (Bytes : in Byte_array) return String is
use Bit_arrays;
Base32 : array (0 .. 31) of Character :=
"ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
Raw : Bit_array (1 .. Bytes'Length * 8);
Pos : Natural := Raw'First;
s : String (1 .. Raw'Length / 5);
B : Byte_array (Bytes'range);
begin
-- Reverse Bytes:
for N in 0 .. 7 loop
B (B'First + N) := Bytes (Bytes'First + 7 - N);
end loop;
for N in 8 .. 15 loop
B (B'First + N) := Bytes (Bytes'First + 15 - N + 8);
end loop;
for N in 16 .. 23 loop
B (B'First + N) := Bytes (Bytes'First + 23 - N + 16);
end loop;
-- Init the bit array:
for i in Bytes'range loop
Raw (Pos .. Pos + 7) := Byte_bit.To_bit_array_BE (B (i));
Pos:= Pos + 8;
end loop;
-- Churn the base32 representation:
Pos := Raw'First;
for i in s'range loop
s (i) :=
Base32 (Bit_arrays.Numbers.To_number_BE (Raw (Pos .. Pos + 4)));
Pos := Pos + 5;
end loop;
return s;
end To_Base32;
end Acf.Types.Base32;