pqc/external/flint-2.4.3/fmpq_mat/set_fmpz_mat_mod_fmpz.c

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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) 2011 Fredrik Johansson
******************************************************************************/
#include "fmpq_mat.h"
int
fmpq_mat_set_fmpz_mat_mod_fmpz(fmpq_mat_t X,
const fmpz_mat_t Xmod, const fmpz_t mod)
{
fmpz_t num, den, t, u, d;
slong i, j;
int success = 1;
fmpz_init(num);
fmpz_init(den);
fmpz_init(d);
fmpz_init(t);
fmpz_init(u);
fmpz_one(d);
for (i = 0; i < Xmod->r; i++)
{
for (j = 0; j < Xmod->c; j++)
{
/* TODO: handle various special cases efficiently; zeros,
small integers, etc. */
fmpz_mul(t, d, fmpz_mat_entry(Xmod, i, j));
fmpz_fdiv_qr(u, t, t, mod);
success = _fmpq_reconstruct_fmpz(num, den, t, mod);
fmpz_mul(den, den, d);
fmpz_set(d, den);
if (!success)
goto cleanup;
fmpz_set(fmpq_mat_entry_num(X, i, j), num);
fmpz_set(fmpq_mat_entry_den(X, i, j), den);
fmpq_canonicalise(fmpq_mat_entry(X, i, j));
}
}
cleanup:
fmpz_clear(num);
fmpz_clear(den);
fmpz_clear(d);
fmpz_clear(t);
fmpz_clear(u);
return success;
}