pqc/external/flint-2.4.3/fmpq_poly/is_canonical.c

65 lines
1.8 KiB
C
Raw Normal View History

2014-05-18 22:03:37 +00:00
/*=============================================================================
This file is part of FLINT.
FLINT 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.
FLINT 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 FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2010 Sebastian Pancratz
******************************************************************************/
#include <gmp.h>
#include <stdlib.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_vec.h"
#include "fmpq_poly.h"
int _fmpq_poly_is_canonical(const fmpz * poly, const fmpz_t den, slong len)
{
if (len)
{
int ans;
fmpz_t c;
if (fmpz_is_zero(poly + len - 1))
return 0;
if (fmpz_sgn(den) < 0)
return 0;
fmpz_init(c);
_fmpz_poly_content(c, poly, len);
fmpz_gcd(c, c, den);
ans = (*c == WORD(1));
fmpz_clear(c);
return ans;
}
else
{
return (*den == WORD(1));
}
}
int fmpq_poly_is_canonical(const fmpq_poly_t poly)
{
return _fmpq_poly_is_canonical(poly->coeffs, poly->den, poly->length);
}