File : fz_divis.ads
1 ------------------------------------------------------------------------------
2 ------------------------------------------------------------------------------
3 -- This file is part of 'Finite Field Arithmetic', aka 'FFA'. --
4 -- --
5 -- (C) 2019 Stanislav Datskovskiy ( www.loper-os.org ) --
6 -- http://wot.deedbot.org/17215D118B7239507FAFED98B98228A001ABFFC7.html --
7 -- --
8 -- You do not have, nor can you ever acquire the right to use, copy or --
9 -- distribute this software ; Should you use this software for any purpose, --
10 -- or copy and distribute it to anyone or in any manner, you are breaking --
11 -- the laws of whatever soi-disant jurisdiction, and you promise to --
12 -- continue doing so for the indefinite future. In any case, please --
13 -- always : read and understand any software ; verify any PGP signatures --
14 -- that you use - for any purpose. --
15 -- --
16 -- See also http://trilema.com/2015/a-new-software-licensing-paradigm . --
17 ------------------------------------------------------------------------------
18 ------------------------------------------------------------------------------
19
20 with FZ_Type; use FZ_Type;
21
22
23 package FZ_Divis is
24
25 pragma Pure;
26
27 -- Dividend is divided by Divisor, producing Quotient and Remainder.
28 -- WARNING: NO div0 test here! Caller must test.
29 procedure FZ_IDiv(Dividend : in FZ;
30 Divisor : in FZ;
31 Quotient : out FZ;
32 Remainder : out FZ)
33 with Pre => Dividend'Length = Divisor'Length and
34 Quotient'Length = Remainder'Length and
35 Dividend'Length = Quotient'Length;
36
37 -- Exactly same thing as IDiv, but keep only the Quotient
38 procedure FZ_Div(Dividend : in FZ;
39 Divisor : in FZ;
40 Quotient : out FZ)
41 with Pre => Dividend'Length = Divisor'Length and
42 Dividend'Length = Quotient'Length;
43
44 -- Modulus. Permits the asymmetric Dividend and Divisor in FZ_Mod_Exp.
45 procedure FZ_Mod(Dividend : in FZ;
46 Divisor : in FZ;
47 Remainder : out FZ)
48 with Pre => Dividend'Length >= Divisor'Length and
49 Divisor'Length = Remainder'Length;
50
51 end FZ_Divis;