pqc/external/flint-2.4.3/fq_poly_templates/deflate.c
2014-05-24 23:16:06 +02:00

62 lines
1.9 KiB
C

/*=============================================================================
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 William Hart
Copyright (C) 2011 Fredrik Johansson
Copyright (C) 2013 Mike Hansen
******************************************************************************/
#ifdef T
#include "templates.h"
void
TEMPLATE(T, poly_deflate) (TEMPLATE(T, poly_t) result,
const TEMPLATE(T, poly_t) input, ulong deflation,
const TEMPLATE(T, ctx_t) ctx)
{
slong res_length, i;
if (deflation == 0)
{
TEMPLATE_PRINTF("Exception (%s_poly_deflate). Division by zero.\n", T);
abort();
}
if (input->length <= 1 || deflation == 1)
{
TEMPLATE(T, poly_set) (result, input, ctx);
return;
}
res_length = (input->length - 1) / deflation + 1;
TEMPLATE(T, poly_fit_length) (result, res_length, ctx);
for (i = 0; i < res_length; i++)
TEMPLATE(T, set) (result->coeffs + i, input->coeffs + (i * deflation),
ctx);
result->length = res_length;
}
#endif