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Annotation of OpenXM_contrib/gmp/mpz/inp_raw.c, Revision 1.1.1.1

1.1       maekawa     1: /* mpz_inp_raw -- Input a mpz_t in raw, but endianess, and wordsize
                      2:    independent format (as output by mpz_out_raw).
                      3:
                      4: Copyright (C) 1991, 1993, 1994, 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_inp_raw (mpz_ptr x, FILE *stream)
                     31: #else
                     32: mpz_inp_raw (x, stream)
                     33:      mpz_ptr x;
                     34:      FILE *stream;
                     35: #endif
                     36: {
                     37:   int i;
                     38:   mp_size_t s;
                     39:   mp_size_t xsize;
                     40:   mp_ptr xp;
                     41:   unsigned int c;
                     42:   mp_limb_t x_limb;
                     43:   mp_size_t in_bytesize;
                     44:   int neg_flag;
                     45:
                     46:   if (stream == 0)
                     47:     stream = stdin;
                     48:
                     49:   /* Read 4-byte size */
                     50:   in_bytesize = 0;
                     51:   for (i = 4 - 1; i >= 0; i--)
                     52:     {
                     53:       c = fgetc (stream);
                     54:       in_bytesize = (in_bytesize << BITS_PER_CHAR) | c;
                     55:     }
                     56:
                     57:   /* Size is stored as a 32 bit word; sign extend in_bytesize for non-32 bit
                     58:      machines.  */
                     59:   if (sizeof (mp_size_t) > 4)
                     60:     in_bytesize |= (-(in_bytesize < 0)) << 31;
                     61:
                     62:   neg_flag = in_bytesize < 0;
                     63:   in_bytesize = ABS (in_bytesize);
                     64:   xsize = (in_bytesize + BYTES_PER_MP_LIMB - 1) / BYTES_PER_MP_LIMB;
                     65:
                     66:   if (xsize == 0)
                     67:     {
                     68:       x->_mp_size = 0;
                     69:       return 4;                        /* we've read 4 bytes */
                     70:     }
                     71:
                     72:   if (x->_mp_alloc < xsize)
                     73:     _mpz_realloc (x, xsize);
                     74:   xp = x->_mp_d;
                     75:
                     76:   x_limb = 0;
                     77:   for (i = (in_bytesize - 1) % BYTES_PER_MP_LIMB; i >= 0; i--)
                     78:     {
                     79:       c = fgetc (stream);
                     80:       x_limb = (x_limb << BITS_PER_CHAR) | c;
                     81:     }
                     82:   xp[xsize - 1] = x_limb;
                     83:
                     84:   for (s = xsize - 2; s >= 0; s--)
                     85:     {
                     86:       x_limb = 0;
                     87:       for (i = BYTES_PER_MP_LIMB - 1; i >= 0; i--)
                     88:        {
                     89:          c = fgetc (stream);
                     90:          x_limb = (x_limb << BITS_PER_CHAR) | c;
                     91:        }
                     92:       xp[s] = x_limb;
                     93:     }
                     94:
                     95:   if (c == EOF)
                     96:     return 0;                  /* error */
                     97:
                     98:   MPN_NORMALIZE (xp, xsize);
                     99:   x->_mp_size = neg_flag ? -xsize : xsize;
                    100:   return in_bytesize + 4;
                    101: }