/* mpi-inline.h  -  Internal to the Multi Precision Integers *	Copyright (C) 1994, 1996, 1998, 1999 Free Software Foundation, Inc. * * This file is part of GnuPG. * * GnuPG 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. * * GnuPG 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 program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA * * Note: This code is heavily based on the GNU MP Library. *	 Actually it's the same code with only minor changes in the *	 way the data is stored; this is to support the abstraction *	 of an optional secure memory allocation which may be used *	 to avoid revealing of sensitive data due to paging etc. *	 The GNU MP Library itself is published under the LGPL; *	 however I decided to publish this code under the plain GPL. */ #ifndef G10_MPI_INLINE_H#define G10_MPI_INLINE_H #ifndef G10_MPI_INLINE_DECL#define G10_MPI_INLINE_DECL  extern inline#endif G10_MPI_INLINE_DECL mpi_limb_tmpihelp_add_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,	      mpi_size_t s1_size, mpi_limb_t s2_limb){	mpi_limb_t x; 	x = *s1_ptr++;	s2_limb += x;	*res_ptr++ = s2_limb;	if (s2_limb < x) {	/* sum is less than the left operand: handle carry */		while (--s1_size) {			x = *s1_ptr++ + 1;	/* add carry */			*res_ptr++ = x;	/* and store */			if (x)	/* not 0 (no overflow): we can stop */				goto leave;		}		return 1;	/* return carry (size of s1 to small) */	} leave:	if (res_ptr != s1_ptr) {	/* not the same variable */		mpi_size_t i;	/* copy the rest */		for (i = 0; i < s1_size - 1; i++)			res_ptr[i] = s1_ptr[i];	}	return 0;		/* no carry */} G10_MPI_INLINE_DECL mpi_limb_tmpihelp_add(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,	    mpi_ptr_t s2_ptr, mpi_size_t s2_size){	mpi_limb_t cy = 0; 	if (s2_size)		cy = mpihelp_add_n(res_ptr, s1_ptr, s2_ptr, s2_size); 	if (s1_size - s2_size)		cy = mpihelp_add_1(res_ptr + s2_size, s1_ptr + s2_size,				   s1_size - s2_size, cy);	return cy;} G10_MPI_INLINE_DECL mpi_limb_tmpihelp_sub_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,	      mpi_size_t s1_size, mpi_limb_t s2_limb){	mpi_limb_t x; 	x = *s1_ptr++;	s2_limb = x - s2_limb;	*res_ptr++ = s2_limb;	if (s2_limb > x) {		while (--s1_size) {			x = *s1_ptr++;			*res_ptr++ = x - 1;			if (x)				goto leave;		}		return 1;	} leave:	if (res_ptr != s1_ptr) {		mpi_size_t i;		for (i = 0; i < s1_size - 1; i++)			res_ptr[i] = s1_ptr[i];	}	return 0;} G10_MPI_INLINE_DECL mpi_limb_tmpihelp_sub(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,	    mpi_ptr_t s2_ptr, mpi_size_t s2_size){	mpi_limb_t cy = 0; 	if (s2_size)		cy = mpihelp_sub_n(res_ptr, s1_ptr, s2_ptr, s2_size); 	if (s1_size - s2_size)		cy = mpihelp_sub_1(res_ptr + s2_size, s1_ptr + s2_size,				   s1_size - s2_size, cy);	return cy;} #endif /*G10_MPI_INLINE_H */