X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/gfx.h

diff --git a/gfx.h b/gfx.h
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-/* -*-c-*-
- *
- * $Id: gfx.h,v 1.3 2004/04/08 01:36:15 mdw Exp $
- *
- * Low-level arithmetic on binary polynomials
- *
- * (c) 2000 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of Catacomb.
- *
- * Catacomb is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * Catacomb 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 Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with Catacomb; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-#ifndef CATACOMB_GFX_H
-#define CATACOMB_GFX_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#ifndef CATACOMB_MPX_H
-#  include "mpx.h"
-#endif
-
-/*----- Functions provided ------------------------------------------------*/
-
-/* --- @gfx_add@ --- *
- *
- * Arguments:	@mpw *dv, *dvl@ = destination vector base and limit
- *		@const mpw *av, *avl@ = first addend vector base and limit
- *		@const mpw *bv, *bvl@ = second addend vector base and limit
- *
- * Returns:	---
- *
- * Use:		Adds two %$\gf{2}$% polynomials.  This is the same as
- *		subtraction.
- */
-
-extern void gfx_add(mpw */*dv*/, mpw */*dvl*/,
-		    const mpw */*av*/, const mpw */*avl*/,
-		    const mpw */*bv*/, const mpw */*bvl*/);
-
-/* --- @gfx_acc@ --- *
- *
- * Arguments:	@mpw *dv, *dvl@ = destination vector base and limit
- *		@const mpw *av, *avl@ = addend vector base and limit
- *
- * Returns:	---
- *
- * Use:		Adds the addend into the destination.  This is considerably
- *		faster than the three-address add call.
- */
-
-extern void gfx_acc(mpw */*dv*/, mpw */*dvl*/,
-		    const mpw */*av*/, const mpw */*avl*/);
-
-/* --- @gfx_accshift@ --- *
- *
- * Arguments:	@mpw *dv, *dvl@ = destination vector base and limit
- *		@const mpw *av, *avl@ = addend vector base and limit
- *		@size_t n@ = number of bits to shift
- *
- * Returns:	---
- *
- * Use:		Shifts the argument left by %$n$% places and adds it to the
- *		destination.  This is a primitive used by multiplication and
- *		division.
- */
-
-extern void gfx_accshift(mpw */*dv*/, mpw */*dvl*/,
-			 const mpw */*av*/, const mpw */*avl*/,
-			 size_t /*n*/);
-
-/* --- @gfx_mul@ --- *
- *
- * Arguments:	@mpw *dv, *dvl@ = destination vector base and limit
- *		@const mpw *av, *avl@ = first argument vector base and limit
- *		@const mpw *bv, *bvl@ = second argument vector base and limit
- *
- * Returns:	---
- *
- * Use:		Does multiplication of polynomials over %$\gf{2}$%.
- */
-
-extern void gfx_mul(mpw */*dv*/, mpw */*dvl*/,
-		    const mpw */*av*/, const mpw */*avl*/,
-		    const mpw */*bv*/, const mpw */*bvl*/);
-
-/* --- @gfx_sqr@ --- *
- *
- * Arguments:	@mpw *dv, *dvl@ = destination vector base and limit
- *		@const mpw *av, *avl@ = argument vector base and limit
- *
- * Returns:	---
- *
- * Use:		Performs squaring of binary polynomials.
- */
-
-extern void gfx_sqr(mpw */*dv*/, mpw */*dvl*/,
-		    const mpw */*av*/, const mpw */*avl*/);
-
-/* --- @gfx_div@ --- *
- *
- * Arguments:	@mpw *qv, *qvl@ = quotient vector base and limit
- *		@mpw *rv, *rvl@ = dividend/remainder vector base and limit
- *		@const mpw *dv, *dvl@ = divisor vector base and limit
- *
- * Returns:	---
- *
- * Use:		Performs division on polynomials over %$\gf{2}$%.
- */
-
-extern void gfx_div(mpw */*qv*/, mpw */*qvl*/, mpw */*rv*/, mpw */*rvl*/,
-		    const mpw */*dv*/, const mpw */*dvl*/);
-
-/*----- Karatsuba multiplication algorithms -------------------------------*/
-
-/* --- @GFK_THRESH@ --- *
- *
- * This is the limiting length for using Karatsuba algorithms.  It's best to
- * use the simpler classical multiplication method on numbers smaller than
- * this.
- */
-
-#define GFK_THRESH 2
-
-/* --- @gfx_kmul@ --- *
- *
- * Arguments:	@mpw *dv, *dvl@ = pointer to destination buffer
- *		@const mpw *av, *avl@ = pointer to first argument
- *		@const mpw *bv, *bvl@ = pointer to second argument
- *		@mpw *sv, *svl@ = pointer to scratch workspace
- *
- * Returns:	---
- *
- * Use:		Multiplies two binary polynomials using Karatsuba's
- *		algorithm.  This is rather faster than traditional long
- *		multiplication (e.g., @gfx_umul@) on polynomials with large
- *		degree, although more expensive on small ones.
- *
- *		The destination must be twice as large as the larger
- *		argument.  The scratch space must be twice as large as the
- *		larger argument.
- */
-
-extern void gfx_kmul(mpw */*dv*/, mpw */*dvl*/,
-		     const mpw */*av*/, const mpw */*avl*/,
-		     const mpw */*bv*/, const mpw */*bvl*/,
-		     mpw */*sv*/, mpw */*svl*/);
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif