[deliverable/linux.git] / lib / mpi / mpiutil.c

/* mpiutil.ac  -  Utility functions for MPI
 * Copyright (C) 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
 */

#include "mpi-internal.h"

/****************
 * Note:  It was a bad idea to use the number of limbs to allocate
 *	  because on a alpha the limbs are large but we normally need
 *	  integers of n bits - So we should chnage this to bits (or bytes).
 *
 *	  But mpi_alloc is used in a lot of places :-)
 */
MPI mpi_alloc(unsigned nlimbs)
{
	MPI a;

	a = kmalloc(sizeof *a, GFP_KERNEL);
	if (!a)
		return a;

	if (nlimbs) {
		a->d = mpi_alloc_limb_space(nlimbs);
		if (!a->d) {
			kfree(a);
			return NULL;
		}
	} else {
		a->d = NULL;
	}

	a->alloced = nlimbs;
	a->nlimbs = 0;
	a->sign = 0;
	a->flags = 0;
	a->nbits = 0;
	return a;
}
EXPORT_SYMBOL_GPL(mpi_alloc);

mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs)
{
	size_t len = nlimbs * sizeof(mpi_limb_t);

	if (!len)
		return NULL;

	return kmalloc(len, GFP_KERNEL);
}

void mpi_free_limb_space(mpi_ptr_t a)
{
	if (!a)
		return;

	kfree(a);
}

void mpi_assign_limb_space(MPI a, mpi_ptr_t ap, unsigned nlimbs)
{
	mpi_free_limb_space(a->d);
	a->d = ap;
	a->alloced = nlimbs;
}

/****************
 * Resize the array of A to NLIMBS. the additional space is cleared
 * (set to 0) [done by m_realloc()]
 */
int mpi_resize(MPI a, unsigned nlimbs)
{
	void *p;

	if (nlimbs <= a->alloced)
		return 0;	/* no need to do it */

	if (a->d) {
		p = kmalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL);
		if (!p)
			return -ENOMEM;
		memcpy(p, a->d, a->alloced * sizeof(mpi_limb_t));
		kfree(a->d);
		a->d = p;
	} else {
		a->d = kzalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL);
		if (!a->d)
			return -ENOMEM;
	}
	a->alloced = nlimbs;
	return 0;
}

void mpi_free(MPI a)
{
	if (!a)
		return;

	if (a->flags & 4)
		kfree(a->d);
	else
		mpi_free_limb_space(a->d);

	if (a->flags & ~7)
		pr_info("invalid flag value in mpi\n");
	kfree(a);
}
EXPORT_SYMBOL_GPL(mpi_free);

MODULE_DESCRIPTION("Multiprecision maths library");
MODULE_LICENSE("GPL");
Commit	Line	Data
cdec9cb5 DK	1	/* mpiutil.ac - Utility functions for MPI
	2	* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
	3	*
	4	* This file is part of GnuPG.
	5	*
	6	* GnuPG is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* GnuPG is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
	19	*/
	20
	21	#include "mpi-internal.h"
	22
	23	/****************
	24	* Note: It was a bad idea to use the number of limbs to allocate
	25	* because on a alpha the limbs are large but we normally need
	26	* integers of n bits - So we should chnage this to bits (or bytes).
	27	*
	28	* But mpi_alloc is used in a lot of places :-)
	29	*/
	30	MPI mpi_alloc(unsigned nlimbs)
	31	{
	32	MPI a;
	33
	34	a = kmalloc(sizeof *a, GFP_KERNEL);
	35	if (!a)
	36	return a;
	37
	38	if (nlimbs) {
	39	a->d = mpi_alloc_limb_space(nlimbs);
	40	if (!a->d) {
	41	kfree(a);
	42	return NULL;
	43	}
	44	} else {
	45	a->d = NULL;
	46	}
	47
	48	a->alloced = nlimbs;
	49	a->nlimbs = 0;
	50	a->sign = 0;
	51	a->flags = 0;
	52	a->nbits = 0;
	53	return a;
	54	}
	55	EXPORT_SYMBOL_GPL(mpi_alloc);
	56
	57	mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs)
	58	{
	59	size_t len = nlimbs * sizeof(mpi_limb_t);
	60
4877e056 DK	61	if (!len)
	62	return NULL;
	63
cdec9cb5 DK	64	return kmalloc(len, GFP_KERNEL);
	65	}
	66
	67	void mpi_free_limb_space(mpi_ptr_t a)
	68	{
	69	if (!a)
	70	return;
	71
	72	kfree(a);
	73	}
	74
	75	void mpi_assign_limb_space(MPI a, mpi_ptr_t ap, unsigned nlimbs)
	76	{
	77	mpi_free_limb_space(a->d);
	78	a->d = ap;
	79	a->alloced = nlimbs;
	80	}
	81
	82	/****************
	83	* Resize the array of A to NLIMBS. the additional space is cleared
	84	* (set to 0) [done by m_realloc()]
	85	*/
	86	int mpi_resize(MPI a, unsigned nlimbs)
	87	{
	88	void *p;
	89
	90	if (nlimbs <= a->alloced)
	91	return 0; /* no need to do it */
	92
	93	if (a->d) {
	94	p = kmalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL);
	95	if (!p)
	96	return -ENOMEM;
	97	memcpy(p, a->d, a->alloced * sizeof(mpi_limb_t));
	98	kfree(a->d);
	99	a->d = p;
	100	} else {
	101	a->d = kzalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL);
	102	if (!a->d)
	103	return -ENOMEM;
	104	}
	105	a->alloced = nlimbs;
	106	return 0;
	107	}
	108
cdec9cb5 DK	109	void mpi_free(MPI a)
	110	{
	111	if (!a)
	112	return;
	113
	114	if (a->flags & 4)
	115	kfree(a->d);
	116	else
	117	mpi_free_limb_space(a->d);
	118
	119	if (a->flags & ~7)
	120	pr_info("invalid flag value in mpi\n");
	121	kfree(a);
	122	}
	123	EXPORT_SYMBOL_GPL(mpi_free);
4ff15822 KK	124
	125	MODULE_DESCRIPTION("Multiprecision maths library");
	126	MODULE_LICENSE("GPL");