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/*=============================================================================
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) 2007 David Howden
Copyright (C) 2007, 2008, 2009, 2010 William Hart
Copyright (C) 2008 Richard Howell-Peak
Copyright (C) 2011 Fredrik Johansson
******************************************************************************/
#include "nmod_poly.h"
#include "ulong_extras.h"
void
nmod_poly_factor_equal_deg(nmod_poly_factor_t factors,
const nmod_poly_t pol, slong d)
{
if (pol->length == d + 1)
{
nmod_poly_factor_insert(factors, pol, 1);
}
else
{
nmod_poly_t f, g;
flint_rand_t state;
nmod_poly_init_preinv(f, pol->mod.n, pol->mod.ninv);
flint_randinit(state);
while (!nmod_poly_factor_equal_deg_prob(f, state, pol, d)) {};
flint_randclear(state);
nmod_poly_init_preinv(g, pol->mod.n, pol->mod.ninv);
nmod_poly_div(g, pol, f);
nmod_poly_factor_equal_deg(factors, f, d);
nmod_poly_clear(f);
nmod_poly_factor_equal_deg(factors, g, d);
nmod_poly_clear(g);
}
}
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