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