128 lines
3.2 KiB
Ada
128 lines
3.2 KiB
Ada
-- Copyright (C) 2015 Daniel Otte <bg@nerilex.org>
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--
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-- This program is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation, either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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package body Spritz is
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procedure InitializeContext (ctx : out Context) is
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begin
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ctx.i := 0;
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ctx.j := 0;
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ctx.k := 0;
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ctx.z := 0;
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ctx.a := 0;
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ctx.w := 1;
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for i in ctx.S'Range loop
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ctx.S(i) := u8(i);
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end loop;
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end;
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procedure Output (ctx : in out Context; z : out u8) is
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begin
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ctx.z := ctx.S(ctx.j + ctx.S(ctx.i + ctx.S(ctx.z + ctx.k)));
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z := ctx.z;
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end Output;
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procedure Update (ctx : in out Context) is
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begin
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ctx.i := ctx.i + ctx.w;
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ctx.j := ctx.k + ctx.S(ctx.j + ctx.S(ctx.i));
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ctx.k := ctx.i + ctx.k + ctx.S(ctx.j);
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Swap(ctx.S(ctx.i), ctx.S(ctx.j));
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end Update;
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procedure Crush (ctx : in out Context) is
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begin
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for v in u8 range 0 .. u8(N / 2 - 1) loop
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if ctx.S(v) > ctx.S(u8(N - 1) - v) then
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Swap(ctx.S(v), ctx.S(u8(N - 1) - v));
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end if;
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end loop;
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end Crush;
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procedure Whip (ctx : in out Context) is
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begin
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for i in 0 .. (2 * N - 1) loop
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Update(ctx);
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end loop;
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ctx.w := ctx.w + 2;
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end Whip;
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procedure Shuffle (ctx : in out Context) is
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begin
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Whip(ctx);
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Crush(ctx);
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Whip(ctx);
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Crush(ctx);
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Whip(ctx);
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ctx.a := 0;
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end Shuffle;
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procedure Drip (ctx : in out Context; z : out u8) is
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begin
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if ctx.a > 0 then
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Shuffle(ctx);
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end if;
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Update(ctx);
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Output(ctx, z);
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end Drip;
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procedure Squeeze (ctx : in out Context; P : out u8_Array) is
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z : u8;
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begin
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for i in P'Range loop
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Drip(ctx, z);
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P(i) := z;
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end loop;
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end Squeeze;
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procedure AbsorbStop (ctx : in out Context) is
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begin
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if ctx.a = u8(N / 2) then
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Shuffle(ctx);
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end if;
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ctx.a := ctx.a + 1;
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end AbsorbStop;
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procedure AbsorbNibble (ctx : in out Context; x : in u8) is
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begin
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if ctx.a = u8(N / 2) then
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Shuffle(ctx);
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end if;
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Swap(ctx.S(ctx.a), ctx.S(u8(N / 2) + x));
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ctx.a := ctx.a + 1;
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end AbsorbNibble;
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procedure Absorb (ctx : in out Context; x : in u8) is
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begin
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AbsorbNibble(ctx, x and 15);
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AbsorbNibble(ctx, Shift_Right(x, 4));
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end Absorb;
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procedure Absorb (ctx : in out Context; x : access constant u8_Array) is
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begin
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for i in x'Range loop
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Absorb(ctx, x(i));
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end loop;
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end Absorb;
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procedure Absorb (ctx : in out Context; x : access constant String) is
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begin
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for i in x'Range loop
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Absorb(ctx, u8(Character'Pos(x(i))));
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end loop;
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end Absorb;
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end Spritz;
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