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

145 lines
3.8 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) 2011 Sebastian Pancratz
Copyright (C) 2013 Mike Hansen
******************************************************************************/
#include <stdio.h>
#include <string.h>
#include "fmpz_vec.h"
#include "padic.h"
#include "qadic.h"
#define FLINT_SRC_CPIMPORT "../qadic/CPimport.txt"
#ifndef FLINT_CPIMPORT
#define FLINT_CPIMPORT FLINT_SRC_CPIMPORT
#endif
void qadic_ctx_init_conway(qadic_ctx_t ctx,
const fmpz_t p, slong d, slong min, slong max,
const char *var, enum padic_print_mode mode)
{
char *buf;
FILE *file;
if (fmpz_cmp_ui(p, 109987) > 0)
{
flint_printf("Exception (qadic_ctx_init_conway). Conway polynomials \n");
flint_printf("are only available for primes up to 109987.\n");
abort();
}
buf = flint_malloc(832);
file = fopen(FLINT_CPIMPORT, "r");
if (!file)
file = fopen(FLINT_SRC_CPIMPORT, "r");
if (!file)
{
file = fopen("CPimport.txt", "r");
if (!file)
{
flint_printf("Exception (qadic_ctx_init_conway). File loading.\n");
abort();
}
}
while (fgets(buf, 832, file))
{
char *tmp = buf;
/* Different prime? */
if (fmpz_cmp_ui(p, atoi(tmp)))
continue;
while (*tmp++ != ' ') ;
/* Same degree? */
if (d == atoi(tmp))
{
slong i, j;
char *ptr;
/* Find number of non-zero coefficients */
ctx->len = 1;
ptr = tmp;
for (i = 0; i < d; i++)
{
while (*ptr++ != ' ') ;
if (atoi(ptr))
ctx->len ++;
}
ctx->a = _fmpz_vec_init(ctx->len);
ctx->j = flint_malloc(ctx->len * sizeof(slong));
/* Copy the polynomial */
j = 0;
ptr = tmp;
for (i = 0; i < d; i++)
{
int coeff;
while (*ptr++ != ' ') ;
coeff = atoi(ptr);
if (coeff)
{
fmpz_set_ui(ctx->a + j, coeff);
ctx->j[j] = i;
j++;
}
}
fmpz_set_ui(ctx->a + j, 1);
ctx->j[j] = d;
/* Complete the initialisation of the context */
padic_ctx_init(&ctx->pctx, p, min, max, mode);
ctx->var = flint_malloc(strlen(var) + 1);
strcpy(ctx->var, var);
fclose(file);
flint_free(buf);
return;
}
}
fclose(file);
flint_free(buf);
flint_printf("Exception (qadic_ctx_init_conway). The polynomial for \n");
flint_printf("(p,d) = (%wd,%wd) is not present in the database.\n", *p, d);
abort();
}