82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/*
|
|
* Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
|
|
#include "mpdecimal.h"
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <assert.h>
|
|
#include "bits.h"
|
|
#include "difradix2.h"
|
|
#include "numbertheory.h"
|
|
#include "fnt.h"
|
|
|
|
|
|
/* Bignum: Fast transform for medium-sized coefficients. */
|
|
|
|
|
|
/* forward transform, sign = -1 */
|
|
int
|
|
std_fnt(mpd_uint_t *a, mpd_size_t n, int modnum)
|
|
{
|
|
struct fnt_params *tparams;
|
|
|
|
assert(ispower2(n));
|
|
assert(n >= 4);
|
|
assert(n <= 3*MPD_MAXTRANSFORM_2N);
|
|
|
|
if ((tparams = _mpd_init_fnt_params(n, -1, modnum)) == NULL) {
|
|
return 0;
|
|
}
|
|
fnt_dif2(a, n, tparams);
|
|
|
|
mpd_free(tparams);
|
|
return 1;
|
|
}
|
|
|
|
/* reverse transform, sign = 1 */
|
|
int
|
|
std_inv_fnt(mpd_uint_t *a, mpd_size_t n, int modnum)
|
|
{
|
|
struct fnt_params *tparams;
|
|
|
|
assert(ispower2(n));
|
|
assert(n >= 4);
|
|
assert(n <= 3*MPD_MAXTRANSFORM_2N);
|
|
|
|
if ((tparams = _mpd_init_fnt_params(n, 1, modnum)) == NULL) {
|
|
return 0;
|
|
}
|
|
fnt_dif2(a, n, tparams);
|
|
|
|
mpd_free(tparams);
|
|
return 1;
|
|
}
|
|
|
|
|
|
|