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/*
Copyright (C) 2020 Fredrik Johansson
This file is part of Calcium.
Calcium is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version. See <http://www.gnu.org/licenses/>.
*/
#include "ca_poly.h"
int
ca_poly_make_monic(ca_poly_t res, const ca_poly_t poly, ca_ctx_t ctx)
{
if (poly->length == 0)
{
ca_poly_zero(res, ctx);
return 0;
}
else
{
if (ca_check_is_one(poly->coeffs + poly->length - 1, ctx) == T_TRUE)
{
ca_poly_set(res, poly, ctx);
ca_one(res->coeffs + res->length - 1, ctx);
return 1;
}
if (ca_check_is_neg_one(poly->coeffs + poly->length - 1, ctx) == T_TRUE)
{
ca_poly_neg(res, poly, ctx);
ca_one(res->coeffs + res->length - 1, ctx);
return 1;
}
ca_poly_set(res, poly, ctx);
ca_inv(res->coeffs + res->length - 1, res->coeffs + res->length - 1, ctx);
if (CA_IS_SPECIAL(res->coeffs + res->length - 1))
{
return 0;
}
else
{
_ca_vec_scalar_mul_ca(res->coeffs, res->coeffs, res->length - 1, res->coeffs + res->length - 1, ctx);
ca_one(res->coeffs + res->length - 1, ctx);
return 1;
}
}
}
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