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/* mpz_out_raw -- write an mpz_t in raw format.
Copyright 2001, 2002 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 Lesser General Public License as published by
the Free Software Foundation; either version 3 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
#include <stdio.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "longlong.h"
/* HTON_LIMB_STORE takes a normal host byte order limb and stores it as
network byte order (ie. big endian). */
#if HAVE_LIMB_BIG_ENDIAN
#define HTON_LIMB_STORE(dst, limb) do { *(dst) = (limb); } while (0)
#endif
#if HAVE_LIMB_LITTLE_ENDIAN
#define HTON_LIMB_STORE(dst, limb) BSWAP_LIMB_STORE (dst, limb)
#endif
#ifndef HTON_LIMB_STORE
#define HTON_LIMB_STORE(dst, limb) \
do { \
mp_limb_t __limb = (limb); \
char *__p = (char *) (dst); \
int __i; \
for (__i = 0; __i < BYTES_PER_MP_LIMB; __i++) \
__p[__i] = (char) (__limb >> ((BYTES_PER_MP_LIMB-1 - __i) * 8)); \
} while (0)
#endif
size_t
mpz_out_raw (FILE *fp, mpz_srcptr x)
{
mp_size_t xsize, abs_xsize, bytes, i;
mp_srcptr xp;
char *tp, *bp;
mp_limb_t xlimb;
int zeros;
size_t tsize, ssize;
xsize = SIZ(x);
abs_xsize = ABS (xsize);
bytes = (abs_xsize * GMP_NUMB_BITS + 7) / 8;
tsize = ROUND_UP_MULTIPLE ((unsigned) 4, BYTES_PER_MP_LIMB) + bytes;
tp = __GMP_ALLOCATE_FUNC_TYPE (tsize, char);
bp = tp + ROUND_UP_MULTIPLE ((unsigned) 4, BYTES_PER_MP_LIMB);
if (bytes != 0)
{
bp += bytes;
xp = PTR (x);
i = abs_xsize;
if (GMP_NAIL_BITS == 0)
{
/* reverse limb order, and byte swap if necessary */
#ifdef _CRAY
_Pragma ("_CRI ivdep");
#endif
do
{
bp -= BYTES_PER_MP_LIMB;
xlimb = *xp;
HTON_LIMB_STORE ((mp_ptr) bp, xlimb);
xp++;
}
while (--i > 0);
/* strip high zero bytes (without fetching from bp) */
count_leading_zeros (zeros, xlimb);
zeros /= 8;
bp += zeros;
bytes -= zeros;
}
else
{
mp_limb_t new_xlimb;
int bits;
ASSERT_CODE (char *bp_orig = bp - bytes);
ASSERT_ALWAYS (GMP_NUMB_BITS >= 8);
bits = 0;
xlimb = 0;
for (;;)
{
while (bits >= 8)
{
ASSERT (bp > bp_orig);
*--bp = xlimb & 0xFF;
xlimb >>= 8;
bits -= 8;
}
if (i == 0)
break;
new_xlimb = *xp++;
i--;
ASSERT (bp > bp_orig);
*--bp = (xlimb | (new_xlimb << bits)) & 0xFF;
xlimb = new_xlimb >> (8 - bits);
bits += GMP_NUMB_BITS - 8;
}
if (bits != 0)
{
ASSERT (bp > bp_orig);
*--bp = xlimb;
}
ASSERT (bp == bp_orig);
while (*bp == 0)
{
bp++;
bytes--;
}
}
}
/* total bytes to be written */
ssize = 4 + bytes;
/* twos complement negative for the size value */
bytes = (xsize >= 0 ? bytes : -bytes);
/* so we don't rely on sign extension in ">>" */
ASSERT_ALWAYS (sizeof (bytes) >= 4);
bp[-4] = bytes >> 24;
bp[-3] = bytes >> 16;
bp[-2] = bytes >> 8;
bp[-1] = bytes;
bp -= 4;
if (fp == 0)
fp = stdout;
if (fwrite (bp, ssize, 1, fp) != 1)
ssize = 0;
(*__gmp_free_func) (tp, tsize);
return ssize;
}
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