Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Add one extra GMP patch to our list (#109)
* Add one extra GMP patch to our list. * Can we have CMake please?
- Loading branch information
1 parent
964a96f
commit c352ccb
Showing
3 changed files
with
174 additions
and
1 deletion.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,172 @@ | ||
/* mpz_inp_raw -- read an mpz_t in raw format. | ||
Copyright 2001, 2002, 2005, 2012, 2016 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 either: | ||
* 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. | ||
or | ||
* the GNU General Public License as published by the Free Software | ||
Foundation; either version 2 of the License, or (at your option) any | ||
later version. | ||
or both in parallel, as here. | ||
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 General Public License | ||
for more details. | ||
You should have received copies of the GNU General Public License and the | ||
GNU Lesser General Public License along with the GNU MP Library. If not, | ||
see https://www.gnu.org/licenses/. */ | ||
|
||
#include <stdio.h> | ||
#include "gmp-impl.h" | ||
|
||
|
||
/* NTOH_LIMB_FETCH fetches a limb which is in network byte order (ie. big | ||
endian) and produces a normal host byte order result. */ | ||
|
||
#if HAVE_LIMB_BIG_ENDIAN | ||
#define NTOH_LIMB_FETCH(limb, src) do { (limb) = *(src); } while (0) | ||
#endif | ||
|
||
#if HAVE_LIMB_LITTLE_ENDIAN | ||
#define NTOH_LIMB_FETCH(limb, src) BSWAP_LIMB_FETCH (limb, src) | ||
#endif | ||
|
||
#ifndef NTOH_LIMB_FETCH | ||
#define NTOH_LIMB_FETCH(limb, src) \ | ||
do { \ | ||
const unsigned char *__p = (const unsigned char *) (src); \ | ||
mp_limb_t __limb; \ | ||
int __i; \ | ||
__limb = 0; \ | ||
for (__i = 0; __i < GMP_LIMB_BYTES; __i++) \ | ||
__limb = (__limb << 8) | __p[__i]; \ | ||
(limb) = __limb; \ | ||
} while (0) | ||
#endif | ||
|
||
|
||
/* Enhancement: The byte swap loop ought to be safe to vectorize on Cray | ||
etc, but someone who knows what they're doing needs to check it. */ | ||
|
||
size_t | ||
mpz_inp_raw (mpz_ptr x, FILE *fp) | ||
{ | ||
unsigned char csize_bytes[4]; | ||
mp_size_t csize, abs_xsize, i; | ||
size_t size; | ||
size_t abs_csize; | ||
char *cp; | ||
mp_ptr xp, sp, ep; | ||
mp_limb_t slimb, elimb; | ||
|
||
if (fp == 0) | ||
fp = stdin; | ||
|
||
/* 4 bytes for size */ | ||
if (fread (csize_bytes, sizeof (csize_bytes), 1, fp) != 1) | ||
return 0; | ||
|
||
size = (((size_t) csize_bytes[0] << 24) + ((size_t) csize_bytes[1] << 16) + | ||
((size_t) csize_bytes[2] << 8) + ((size_t) csize_bytes[3])); | ||
|
||
if (size < 0x80000000u) | ||
csize = size; | ||
else | ||
csize = size - 0x80000000u - 0x80000000u; | ||
|
||
abs_csize = ABS (csize); | ||
|
||
if (UNLIKELY (abs_csize > ~(mp_bitcnt_t) 0 / 8)) | ||
return 0; /* Bit size overflows */ | ||
|
||
/* round up to a multiple of limbs */ | ||
abs_xsize = BITS_TO_LIMBS ((mp_bitcnt_t) abs_csize * 8); | ||
|
||
if (abs_xsize != 0) | ||
{ | ||
xp = MPZ_NEWALLOC (x, abs_xsize); | ||
|
||
/* Get limb boundaries right in the read, for the benefit of the | ||
non-nails case. */ | ||
xp[0] = 0; | ||
cp = (char *) (xp + abs_xsize) - abs_csize; | ||
if (fread (cp, abs_csize, 1, fp) != 1) | ||
return 0; | ||
|
||
if (GMP_NAIL_BITS == 0) | ||
{ | ||
/* Reverse limbs to least significant first, and byte swap. If | ||
abs_xsize is odd then on the last iteration elimb and slimb are | ||
the same. It doesn't seem extra code to handle that case | ||
separately, to save an NTOH. */ | ||
sp = xp; | ||
ep = xp + abs_xsize-1; | ||
for (i = 0; i < (abs_xsize+1)/2; i++) | ||
{ | ||
NTOH_LIMB_FETCH (elimb, ep); | ||
NTOH_LIMB_FETCH (slimb, sp); | ||
*sp++ = elimb; | ||
*ep-- = slimb; | ||
} | ||
} | ||
else | ||
{ | ||
/* It ought to be possible to do the transformation in-place, but | ||
for now it's easier to use an extra temporary area. */ | ||
mp_limb_t byte, limb; | ||
int bits; | ||
mp_size_t tpos; | ||
mp_ptr tp; | ||
TMP_DECL; | ||
|
||
TMP_MARK; | ||
tp = TMP_ALLOC_LIMBS (abs_xsize); | ||
limb = 0; | ||
bits = 0; | ||
tpos = 0; | ||
for (i = abs_csize-1; i >= 0; i--) | ||
{ | ||
byte = (unsigned char) cp[i]; | ||
limb |= (byte << bits); | ||
bits += 8; | ||
if (bits >= GMP_NUMB_BITS) | ||
{ | ||
ASSERT (tpos < abs_xsize); | ||
tp[tpos++] = limb & GMP_NUMB_MASK; | ||
bits -= GMP_NUMB_BITS; | ||
ASSERT (bits < 8); | ||
limb = byte >> (8 - bits); | ||
} | ||
} | ||
if (bits != 0) | ||
{ | ||
ASSERT (tpos < abs_xsize); | ||
tp[tpos++] = limb; | ||
} | ||
ASSERT (tpos == abs_xsize); | ||
|
||
MPN_COPY (xp, tp, abs_xsize); | ||
TMP_FREE; | ||
} | ||
|
||
/* GMP 1.x mpz_out_raw wrote high zero bytes, strip any high zero | ||
limbs resulting from this. Should be a non-zero value here, but | ||
for safety don't assume that. */ | ||
MPN_NORMALIZE (xp, abs_xsize); | ||
} | ||
|
||
SIZ(x) = (csize >= 0 ? abs_xsize : -abs_xsize); | ||
return abs_csize + 4; | ||
} |