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aa9bc17601
BMakefiles and other bits will follow. Requested by: Andrey Chernov Made world by: Chuck Robey
102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/* mpz_inp_raw -- Input a mpz_t in raw, but endianess, and wordsize
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independent format (as output by mpz_out_raw).
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Copyright (C) 1991, 1993, 1994, 1995 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include <stdio.h>
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#include "gmp.h"
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#include "gmp-impl.h"
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size_t
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#if __STDC__
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mpz_inp_raw (mpz_ptr x, FILE *stream)
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#else
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mpz_inp_raw (x, stream)
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mpz_ptr x;
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FILE *stream;
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#endif
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{
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int i;
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mp_size_t s;
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mp_size_t xsize;
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mp_ptr xp;
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unsigned int c;
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mp_limb_t x_limb;
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mp_size_t in_bytesize;
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int neg_flag;
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if (stream == 0)
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stream = stdin;
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/* Read 4-byte size */
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in_bytesize = 0;
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for (i = 4 - 1; i >= 0; i--)
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{
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c = fgetc (stream);
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in_bytesize = (in_bytesize << BITS_PER_CHAR) | c;
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}
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/* Size is stored as a 32 bit word; sign extend in_bytesize for non-32 bit
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machines. */
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if (sizeof (mp_size_t) > 4)
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in_bytesize |= (-(in_bytesize < 0)) << 31;
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neg_flag = in_bytesize < 0;
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in_bytesize = ABS (in_bytesize);
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xsize = (in_bytesize + BYTES_PER_MP_LIMB - 1) / BYTES_PER_MP_LIMB;
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if (xsize == 0)
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{
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x->_mp_size = 0;
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return 4; /* we've read 4 bytes */
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}
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if (x->_mp_alloc < xsize)
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_mpz_realloc (x, xsize);
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xp = x->_mp_d;
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x_limb = 0;
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for (i = (in_bytesize - 1) % BYTES_PER_MP_LIMB; i >= 0; i--)
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{
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c = fgetc (stream);
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x_limb = (x_limb << BITS_PER_CHAR) | c;
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}
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xp[xsize - 1] = x_limb;
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for (s = xsize - 2; s >= 0; s--)
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{
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x_limb = 0;
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for (i = BYTES_PER_MP_LIMB - 1; i >= 0; i--)
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{
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c = fgetc (stream);
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x_limb = (x_limb << BITS_PER_CHAR) | c;
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}
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xp[s] = x_limb;
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}
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if (c == EOF)
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return 0; /* error */
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MPN_NORMALIZE (xp, xsize);
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x->_mp_size = neg_flag ? -xsize : xsize;
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return in_bytesize + 4;
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}
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