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/*=============================================================================
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
******************************************************************************/
#include "padic.h"
void padic_ctx_init(padic_ctx_t ctx, const fmpz_t p, long N,
enum padic_print_mode mode)
{
fmpz_init(ctx->p);
fmpz_set(ctx->p, p);
ctx->N = N;
ctx->pinv = (!COEFF_IS_MPZ(*p)) ? n_precompute_inverse(fmpz_get_ui(p)) : 0;
if (N > 0)
{
long i, len;
ctx->min = FLINT_MAX(1, N - 10);
ctx->max = N + 10;
len = ctx->max - ctx->min;
ctx->pow = _fmpz_vec_init(len);
fmpz_pow_ui(ctx->pow, p, ctx->min);
for (i = 1; i < len; i++)
fmpz_mul(ctx->pow + i, ctx->pow + (i - 1), p);
}
else
{
ctx->min = 0;
ctx->max = 0;
ctx->pow = NULL;
}
ctx->mode = mode;
}
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