125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
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/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2012 Andres Goens
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Copyright (C) 2012 Sebastian Pancratz
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Copyright (C) 2013 Mike Hansen
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******************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include "fq_nmod.h"
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int _fq_nmod_ctx_init_conway(fq_nmod_ctx_t ctx, const fmpz_t p, slong d, const char *var)
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{
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char *buf;
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FILE *file;
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if (fmpz_cmp_ui(p, 109987) > 0)
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{
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return 0;
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}
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buf = flint_malloc(832);
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file = fopen(FLINT_CPIMPORT, "r");
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if (!file)
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{
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file = fopen("../qadic/CPimport.txt", "r");
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if (!file)
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{
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flint_printf("Exception (fq_nmod_ctx_init_conway). File loading.\n");
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abort();
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}
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}
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while (fgets(buf, 832, file))
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{
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char *tmp = buf;
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/* Different prime? */
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if (fmpz_cmp_ui(p, atoi(tmp)))
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continue;
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while (*tmp++ != ' ') ;
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/* Same degree? */
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if (d == atoi(tmp))
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{
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nmod_poly_t mod;
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slong i;
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char *ptr;
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nmod_poly_init(mod, fmpz_get_ui(p));
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/* Copy the polynomial */
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ptr = tmp;
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for (i = 0; i < d; i++)
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{
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int coeff;
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while (*ptr++ != ' ') ;
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coeff = atoi(ptr);
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nmod_poly_set_coeff_ui(mod, i, coeff);
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}
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nmod_poly_set_coeff_ui(mod, d, 1);
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fq_nmod_ctx_init_modulus(ctx, mod, var);
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nmod_poly_clear(mod);
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fclose(file);
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flint_free(buf);
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return 1;
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}
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}
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fclose(file);
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flint_free(buf);
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return 0;
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}
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void fq_nmod_ctx_init_conway(fq_nmod_ctx_t ctx, const fmpz_t p, slong d, const char *var)
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{
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int result;
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if (fmpz_cmp_ui(p, 109987) > 0)
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{
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flint_printf("Exception (fq_nmod_ctx_init_conway). Conway polynomials \n");
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flint_printf("are only available for primes up to 109987.\n");
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abort();
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}
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result = _fq_nmod_ctx_init_conway(ctx, p, d, var);
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if (!result) {
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flint_printf("Exception (fq_nmod_ctx_init_conway). The polynomial for \n(p,d) = (");
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fmpz_print(p), flint_printf(",%wd) is not present in the database.\n", d);
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abort();
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}
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}
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