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Annotation of OpenXM_contrib/gmp/mpz/out_raw.c, Revision 1.1.1.2

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
1.1.1.2 ! maekawa     9: it under the terms of the GNU Lesser General Public License as published by
        !            10: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    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
1.1.1.2 ! maekawa    15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    16: License for more details.
                     17:
1.1.1.2 ! maekawa    18: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    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: }