Annotation of OpenXM/src/kan96xx/gmp-2.0.2/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: }
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