100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
/*=============================================================================
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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) 2010 William Hart
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******************************************************************************/
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#include <gmp.h>
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#include "flint.h"
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#include "fmpz.h"
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#include "fmpz_poly.h"
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void
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_fmpz_poly_bit_pack(mp_ptr arr, const fmpz * poly, slong len,
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mp_bitcnt_t bit_size, int negate)
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{
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mp_bitcnt_t bits = 0;
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mp_size_t limbs = 0;
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mp_bitcnt_t b = bit_size % FLINT_BITS;
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mp_size_t l = bit_size / FLINT_BITS;
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int borrow = 0;
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slong i;
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for (i = 0; i < len; i++)
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{
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borrow =
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fmpz_bit_pack(arr + limbs, bits, bit_size, poly + i, negate,
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borrow);
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limbs += l;
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bits += b;
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if (bits >= FLINT_BITS)
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{
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bits -= FLINT_BITS;
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limbs++;
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}
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}
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}
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void
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fmpz_poly_bit_pack(fmpz_t f, const fmpz_poly_t poly,
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mp_bitcnt_t bit_size)
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{
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slong len;
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__mpz_struct * mpz;
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slong i, d;
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int negate;
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len = fmpz_poly_length(poly);
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if (len == 0 || bit_size == 0)
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{
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fmpz_zero(f);
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return;
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}
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mpz = _fmpz_promote(f);
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mpz_realloc2(mpz, len * bit_size);
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d = mpz->_mp_alloc;
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flint_mpn_zero(mpz->_mp_d, d);
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if (fmpz_sgn(fmpz_poly_lead(poly)) < 0)
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negate = -1;
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else
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negate = 0;
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_fmpz_poly_bit_pack(mpz->_mp_d, poly->coeffs, len, bit_size, negate);
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for (i = d - 1; i >= 0; i--)
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{
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if (mpz->_mp_d[i] != 0)
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break;
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}
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d = i + 1;
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mpz->_mp_size = d;
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_fmpz_demote_val(f);
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if (negate)
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fmpz_neg(f, f);
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}
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