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/* mpz_export -- create word data from mpz.
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Copyright 2002, 2003, 2012 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 either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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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 General Public License
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for more details.
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You should have received copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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#include <stdio.h> /* for NULL */
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "longlong.h"
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#if HAVE_LIMB_BIG_ENDIAN
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#define HOST_ENDIAN 1
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#endif
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#if HAVE_LIMB_LITTLE_ENDIAN
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#define HOST_ENDIAN (-1)
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#endif
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#ifndef HOST_ENDIAN
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static const mp_limb_t endian_test = (CNST_LIMB(1) << (GMP_LIMB_BITS-7)) - 1;
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#define HOST_ENDIAN (* (signed char *) &endian_test)
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#endif
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void *
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mpz_export (void *data, size_t *countp, int order,
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size_t size, int endian, size_t nail, mpz_srcptr z)
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{
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mp_size_t zsize;
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mp_srcptr zp;
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size_t count, dummy;
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unsigned long numb;
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unsigned align;
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ASSERT (order == 1 || order == -1);
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ASSERT (endian == 1 || endian == 0 || endian == -1);
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ASSERT (nail <= 8*size);
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ASSERT (nail < 8*size || SIZ(z) == 0); /* nail < 8*size+(SIZ(z)==0) */
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if (countp == NULL)
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countp = &dummy;
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zsize = SIZ(z);
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if (zsize == 0)
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{
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*countp = 0;
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return data;
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}
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zsize = ABS (zsize);
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zp = PTR(z);
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numb = 8*size - nail;
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MPN_SIZEINBASE_2EXP (count, zp, zsize, numb);
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*countp = count;
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if (data == NULL)
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data = (*__gmp_allocate_func) (count*size);
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if (endian == 0)
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endian = HOST_ENDIAN;
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align = ((char *) data - (char *) NULL) % sizeof (mp_limb_t);
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if (nail == GMP_NAIL_BITS)
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{
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if (size == sizeof (mp_limb_t) && align == 0)
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{
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if (order == -1 && endian == HOST_ENDIAN)
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{
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MPN_COPY ((mp_ptr) data, zp, (mp_size_t) count);
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return data;
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}
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if (order == 1 && endian == HOST_ENDIAN)
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{
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MPN_REVERSE ((mp_ptr) data, zp, (mp_size_t) count);
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return data;
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}
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if (order == -1 && endian == -HOST_ENDIAN)
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{
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MPN_BSWAP ((mp_ptr) data, zp, (mp_size_t) count);
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return data;
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}
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if (order == 1 && endian == -HOST_ENDIAN)
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{
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MPN_BSWAP_REVERSE ((mp_ptr) data, zp, (mp_size_t) count);
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return data;
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}
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}
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}
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{
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mp_limb_t limb, wbitsmask;
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size_t i, numb;
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mp_size_t j, wbytes, woffset;
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unsigned char *dp;
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int lbits, wbits;
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mp_srcptr zend;
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numb = size * 8 - nail;
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/* whole bytes per word */
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wbytes = numb / 8;
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/* possible partial byte */
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wbits = numb % 8;
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wbitsmask = (CNST_LIMB(1) << wbits) - 1;
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/* offset to get to the next word */
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woffset = (endian >= 0 ? size : - (mp_size_t) size)
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+ (order < 0 ? size : - (mp_size_t) size);
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/* least significant byte */
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dp = (unsigned char *) data
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+ (order >= 0 ? (count-1)*size : 0) + (endian >= 0 ? size-1 : 0);
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#define EXTRACT(N, MASK) \
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do { \
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if (lbits >= (N)) \
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{ \
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*dp = limb MASK; \
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limb >>= (N); \
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lbits -= (N); \
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} \
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else \
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{ \
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mp_limb_t newlimb; \
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newlimb = (zp == zend ? 0 : *zp++); \
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*dp = (limb | (newlimb << lbits)) MASK; \
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limb = newlimb >> ((N)-lbits); \
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lbits += GMP_NUMB_BITS - (N); \
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} \
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} while (0)
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zend = zp + zsize;
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lbits = 0;
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limb = 0;
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for (i = 0; i < count; i++)
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{
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for (j = 0; j < wbytes; j++)
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{
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EXTRACT (8, + 0);
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dp -= endian;
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}
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if (wbits != 0)
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{
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EXTRACT (wbits, & wbitsmask);
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dp -= endian;
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j++;
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}
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for ( ; j < size; j++)
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{
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*dp = '\0';
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dp -= endian;
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}
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dp += woffset;
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}
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ASSERT (zp == PTR(z) + ABSIZ(z));
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/* low byte of word after most significant */
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ASSERT (dp == (unsigned char *) data
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+ (order < 0 ? count*size : - (mp_size_t) size)
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+ (endian >= 0 ? (mp_size_t) size - 1 : 0));
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}
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return data;
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}
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