pqc/external/flint-2.4.3/fmpz_mat/fread.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 Andy Novocin
******************************************************************************/
#include "fmpz_mat.h"
int
fmpz_mat_fread(FILE* file, fmpz_mat_t mat)
{
slong r, c, i, j;
int byte_count;
mpz_t t;
/* first number in file should be row dimension */
mpz_init(t);
byte_count = mpz_inp_str(t, file, 10);
if (byte_count == 0)
{
mpz_clear(t);
return 0;
}
if (!mpz_fits_slong_p(t))
{
flint_printf("Exception (fmpz_mat_fread). "
"Number of rows does not fit into a slong.\n");
abort();
}
r = flint_mpz_get_si(t);
/* second number in file should be column dimension */
byte_count = mpz_inp_str(t, file, 10);
if (byte_count == 0)
{
mpz_clear(t);
return 0;
}
if (!mpz_fits_slong_p(t))
{
flint_printf("Exception (fmpz_mat_fread). "
"Number of columns does not fit into a slong.\n");
abort();
}
c = flint_mpz_get_si(t);
mpz_clear(t);
/* if the input is 0 by 0 then set the dimensions to r and c */
if (mat->r == 0 && mat->c == 0)
{
fmpz_mat_clear(mat);
fmpz_mat_init(mat,r,c);
}
else if (mat->r == 0 && mat->c == 0)
{
flint_printf("Exception (fmpz_mat_fread). \n"
"Dimensions are non-zero and do not match input dimensions.\n");
abort();
}
for (i = 0; i < r; i++)
{
for (j = 0; j < c; j++)
{
if (!fmpz_fread(file, fmpz_mat_entry(mat, i, j)))
return 0;
}
}
/* a return value of 0 means a problem with
the file stream a value of 1 means success*/
return 1;
}