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Annotation of OpenXM_contrib/gmp/mpz/out_raw.c, Revision 1.1

1.1     ! maekawa     1: /* mpz_out_raw -- Output a mpz_t in binary.  Use an endianess and word size
        !             2:    independent format.
        !             3:
        !             4: Copyright (C) 1995 Free Software Foundation, Inc.
        !             5:
        !             6: This file is part of the GNU MP Library.
        !             7:
        !             8: The GNU MP Library is free software; you can redistribute it and/or modify
        !             9: it under the terms of the GNU Library General Public License as published by
        !            10: the Free Software Foundation; either version 2 of the License, or (at your
        !            11: option) any later version.
        !            12:
        !            13: The GNU MP Library is distributed in the hope that it will be useful, but
        !            14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            16: License for more details.
        !            17:
        !            18: You should have received a copy of the GNU Library General Public License
        !            19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: MA 02111-1307, USA. */
        !            22:
        !            23: #include <stdio.h>
        !            24:
        !            25: #include "gmp.h"
        !            26: #include "gmp-impl.h"
        !            27:
        !            28: size_t
        !            29: #if __STDC__
        !            30: mpz_out_raw (FILE *stream, mpz_srcptr x)
        !            31: #else
        !            32: mpz_out_raw (stream, x)
        !            33:      FILE *stream;
        !            34:      mpz_srcptr x;
        !            35: #endif
        !            36: {
        !            37:   int i;
        !            38:   mp_size_t s;
        !            39:   mp_size_t xsize = ABS (x->_mp_size);
        !            40:   mp_srcptr xp = x->_mp_d;
        !            41:   mp_size_t out_bytesize;
        !            42:   mp_limb_t hi_limb;
        !            43:   int n_bytes_in_hi_limb;
        !            44:
        !            45:   if (stream == 0)
        !            46:     stream = stdout;
        !            47:
        !            48:   if (xsize == 0)
        !            49:     {
        !            50:       for (i = 4 - 1; i >= 0; i--)
        !            51:        fputc (0, stream);
        !            52:       return ferror (stream) ? 0 : 4;
        !            53:     }
        !            54:
        !            55:   hi_limb = xp[xsize - 1];
        !            56:   for (i = BYTES_PER_MP_LIMB - 1; i > 0; i--)
        !            57:     {
        !            58:       if ((hi_limb >> i * BITS_PER_CHAR) != 0)
        !            59:        break;
        !            60:     }
        !            61:   n_bytes_in_hi_limb = i + 1;
        !            62:   out_bytesize = BYTES_PER_MP_LIMB * (xsize - 1) + n_bytes_in_hi_limb;
        !            63:   if (x->_mp_size < 0)
        !            64:     out_bytesize = -out_bytesize;
        !            65:
        !            66:   /* Make the size 4 bytes on all machines, to make the format portable.  */
        !            67:   for (i = 4 - 1; i >= 0; i--)
        !            68:     fputc ((out_bytesize >> (i * BITS_PER_CHAR)) % (1 << BITS_PER_CHAR),
        !            69:           stream);
        !            70:
        !            71:   /* Output from the most significant limb to the least significant limb,
        !            72:      with each limb also output in decreasing significance order.  */
        !            73:
        !            74:   /* Output the most significant limb separately, since we will only
        !            75:      output some of its bytes.  */
        !            76:   for (i = n_bytes_in_hi_limb - 1; i >= 0; i--)
        !            77:     fputc ((hi_limb >> (i * BITS_PER_CHAR)) % (1 << BITS_PER_CHAR), stream);
        !            78:
        !            79:   /* Output the remaining limbs.  */
        !            80:   for (s = xsize - 2; s >= 0; s--)
        !            81:     {
        !            82:       mp_limb_t x_limb;
        !            83:
        !            84:       x_limb = xp[s];
        !            85:       for (i = BYTES_PER_MP_LIMB - 1; i >= 0; i--)
        !            86:        fputc ((x_limb >> (i * BITS_PER_CHAR)) % (1 << BITS_PER_CHAR), stream);
        !            87:     }
        !            88:   return ferror (stream) ? 0 : ABS (out_bytesize) + 4;
        !            89: }