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/*
 *  mplogic.h
 *
 *  Bitwise logical operations on MPI values
 *
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is the MPI Arbitrary Precision Integer Arithmetic
 * library.
 *
 * The Initial Developer of the Original Code is Michael J. Fromberger.
 * Portions created by Michael J. Fromberger are 
 * Copyright (C) 1998, 1999, 2000 Michael J. Fromberger. 
 * All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable
 * instead of those above.  If you wish to allow use of your
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the GPL.
 *
 *  $Id: mplogic.h,v 1.5 2000/08/01 01:38:29 nelsonb%netscape.com Exp $
 */

#ifndef _H_MPLOGIC_
#define _H_MPLOGIC_

#include "mpi.h"

/*
  The logical operations treat an mp_int as if it were a bit vector,
  without regard to its sign (an mp_int is represented in a signed
  magnitude format).  Values are treated as if they had an infinite
  string of zeros left of the most-significant bit.
 */

/* Parity results                    */

#define MP_EVEN       MP_YES
#define MP_ODD        MP_NO

/* Bitwise functions                 */

mp_err mpl_not(mp_int *a, mp_int *b);            /* one's complement  */
mp_err mpl_and(mp_int *a, mp_int *b, mp_int *c); /* bitwise AND       */
mp_err mpl_or(mp_int *a, mp_int *b, mp_int *c);  /* bitwise OR        */
mp_err mpl_xor(mp_int *a, mp_int *b, mp_int *c); /* bitwise XOR       */

/* Shift functions                   */

mp_err mpl_rsh(const mp_int *a, mp_int *b, mp_digit d);   /* right shift    */
mp_err mpl_lsh(const mp_int *a, mp_int *b, mp_digit d);   /* left shift     */

/* Bit count and parity              */

mp_err mpl_num_set(mp_int *a, int *num);         /* count set bits    */
mp_err mpl_num_clear(mp_int *a, int *num);       /* count clear bits  */
mp_err mpl_parity(mp_int *a);                    /* determine parity  */

/* Get & Set the value of a bit */

mp_err mpl_set_bit(mp_int *a, mp_size bitNum, mp_size value);
mp_err mpl_get_bit(const mp_int *a, mp_size bitNum);
mp_err mpl_get_bits(const mp_int *a, mp_size lsbNum, mp_size numBits);
mp_err mpl_significant_bits(const mp_int *a);

#endif /* end _H_MPLOGIC_ */