X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/mp-io.c

diff --git a/mp-io.c b/mp-io.c
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--- a/mp-io.c
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-/* -*-c-*-
- *
- * $Id$
- *
- * Loading and storing of multiprecision integers
- *
- * (c) 1999 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of Catacomb.
- *
- * Catacomb 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.
- *
- * Catacomb 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 Catacomb; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#include "mp.h"
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @mp_octets@ --- *
- *
- * Arguments:	@const mp *m@ = a multiprecision integer
- *
- * Returns:	The number of octets required to represent @m@.
- *
- * Use:		Calculates the external storage required for a multiprecision
- *		integer.
- */
-
-size_t mp_octets(const mp *m)
-{
-  size_t sz;
-  MPX_OCTETS(sz, m->v, m->vl);
-  return (sz);
-}
-
-/* --- @mp_octets2c@ --- *
- *
- * Arguments:	@const mp *m@ = a multiprecision integer
- *
- * Returns:	The number of octets required to represent @m@.
- *
- * Use:		Calculates the external storage required for a multiprecision
- *		integer represented as two's complement.
- */
-
-size_t mp_octets2c(const mp *m)
-{
-  size_t sz;
-  MPX_OCTETS2C(sz, m->v, m->vl);
-  return (sz);
-}
-
-/* --- @mp_bits@ --- *
- *
- * Arguments:	@const mp *m@ = a multiprecision integer
- *
- * Returns:	The number of bits required to represent @m@.
- *
- * Use:		Calculates the external storage required for a multiprecision
- *		integer.
- */
-
-unsigned long mp_bits(const mp *m)
-{
-  unsigned long bits;
-  MPX_BITS(bits, m->v, m->vl);
-  return (bits);
-}
-
-/* --- @mp_loadl@ --- *
- *
- * Arguments:	@mp *d@ = destination
- *		@const void *pv@ = pointer to source data
- *		@size_t sz@ = size of the source data
- *
- * Returns:	Resulting multiprecision number.
- *
- * Use:		Loads a multiprecision number from an array of octets.  The
- *		first byte in the array is the least significant.  More
- *		formally, if the bytes are %$b_0, b_1, \ldots, b_{n-1}$%
- *		then the result is %$N = \sum_{0 \le i < n} b_i 2^{8i}$%.
- */
-
-mp *mp_loadl(mp *d, const void *pv, size_t sz)
-{
-  MP_DEST(d, MPW_RQ(sz), MP_UNDEF);
-  mpx_loadl(d->v, d->vl, pv, sz);
-  d->f &= ~(MP_UNDEF | MP_NEG);
-  mp_shrink(d);
-  return (d);
-}
-
-/* --- @mp_storel@ --- *
- *
- * Arguments:	@const mp *m@ = source
- *		@void *pv@ = pointer to output array
- *		@size_t sz@ = size of the output array
- *
- * Returns:	---
- *
- * Use:		Stores a multiprecision number in an array of octets.  The
- *		first byte in the array is the least significant.  If the
- *		array is too small to represent the number, high-order bits
- *		are truncated; if the array is too large, high order bytes
- *		are filled with zeros.  More formally, if the number is
- *		%$N = \sum{0 \le i} b_i 2^{8i}$% where %$0 \le b_i < 256$%,
- *		then the array is %$b_0, b_1, \ldots, b_{n-1}$%.
- */
-
-void mp_storel(const mp *m, void *pv, size_t sz)
-{
-  mpx_storel(m->v, m->vl, pv, sz);
-}
-
-/* --- @mp_loadb@ --- *
- *
- * Arguments:	@mp *d@ = destination
- *		@const void *pv@ = pointer to source data
- *		@size_t sz@ = size of the source data
- *
- * Returns:	Resulting multiprecision number.
- *
- * Use:		Loads a multiprecision number from an array of octets.  The
- *		last byte in the array is the least significant.  More
- *		formally, if the bytes are %$b_{n-1}, b_{n-2}, \ldots, b_0$%
- *		then the result is %$N = \sum_{0 \le i < n} b_i 2^{8i}$%.
- */
-
-mp *mp_loadb(mp *d, const void *pv, size_t sz)
-{
-  MP_DEST(d, MPW_RQ(sz), MP_UNDEF);
-  mpx_loadb(d->v, d->vl, pv, sz);
-  d->f &= ~(MP_UNDEF | MP_NEG);
-  mp_shrink(d);
-  return (d);
-}
-
-/* --- @mp_storeb@ --- *
- *
- * Arguments:	@const mp *m@ = source
- *		@void *pv@ = pointer to output array
- *		@size_t sz@ = size of the output array
- *
- * Returns:	---
- *
- * Use:		Stores a multiprecision number in an array of octets.  The
- *		last byte in the array is the least significant.  If the
- *		array is too small to represent the number, high-order bits
- *		are truncated; if the array is too large, high order bytes
- *		are filled with zeros.  More formally, if the number is
- *		%$N = \sum{0 \le i} b_i 2^{8i}$% where %$0 \le b_i < 256$%,
- *		then the array is %$b_{n-1}, b_{n-2}, \ldots, b_0$%.
- */
-
-void mp_storeb(const mp *m, void *pv, size_t sz)
-{
-  mpx_storeb(m->v, m->vl, pv, sz);
-}
-
-/* --- @mp_loadl2c@ --- *
- *
- * Arguments:	@mp *d@ = destination
- *		@const void *pv@ = pointer to source data
- *		@size_t sz@ = size of the source data
- *
- * Returns:	Resulting multiprecision number.
- *
- * Use:		Loads a multiprecision number from an array of octets as
- *		two's complement.  The first byte in the array is the least
- *		significant.
- */
-
-mp *mp_loadl2c(mp *d, const void *pv, size_t sz)
-{
-  const octet *ov = pv;
-  MP_DEST(d, MPW_RQ(sz), MP_UNDEF);
-  if (!sz || !(ov[sz - 1] & 0x80)) {
-    mpx_loadl(d->v, d->vl, pv, sz);
-    d->f &= ~MP_NEG;
-  } else {
-    mpx_loadl2cn(d->v, d->vl, pv, sz);
-    d->f |= MP_NEG;
-  }
-  d->f &= ~MP_UNDEF;
-  mp_shrink(d);
-  return (d);
-}
-
-/* --- @mp_storel2c@ --- *
- *
- * Arguments:	@const mp *m@ = source
- *		@void *pv@ = pointer to output array
- *		@size_t sz@ = size of the output array
- *
- * Returns:	---
- *
- * Use:		Stores a multiprecision number in an array of octets as two's
- *		complement.  The first byte in the array is the least
- *		significant.  If the array is too small to represent the
- *		number, high-order bits are truncated; if the array is too
- *		large, high order bytes are sign-extended.
- */
-
-void mp_storel2c(const mp *m, void *pv, size_t sz)
-{
-  if (MP_NEGP(m))
-    mpx_storel2cn(m->v, m->vl, pv, sz);
-  else
-    mpx_storel(m->v, m->vl, pv, sz);
-}
-
-/* --- @mp_loadb2c@ --- *
- *
- * Arguments:	@mp *d@ = destination
- *		@const void *pv@ = pointer to source data
- *		@size_t sz@ = size of the source data
- *
- * Returns:	Resulting multiprecision number.
- *
- * Use:		Loads a multiprecision number from an array of octets as
- *		two's complement.  The last byte in the array is the least
- *		significant.
- */
-
-mp *mp_loadb2c(mp *d, const void *pv, size_t sz)
-{
-  const octet *ov = pv;
-  MP_DEST(d, MPW_RQ(sz), MP_UNDEF);
-  if (!sz || !(ov[0] & 0x80)) {
-    mpx_loadb(d->v, d->vl, pv, sz);
-    d->f &= ~MP_NEG;
-  } else {
-    mpx_loadb2cn(d->v, d->vl, pv, sz);
-    d->f |= MP_NEG;
-  }
-  d->f &= ~MP_UNDEF;
-  mp_shrink(d);
-  return (d);
-}
-
-/* --- @mp_storeb2c@ --- *
- *
- * Arguments:	@const mp *m@ = source
- *		@void *pv@ = pointer to output array
- *		@size_t sz@ = size of the output array
- *
- * Returns:	---
- *
- * Use:		Stores a multiprecision number in an array of octets, as
- *		two's complement.  The last byte in the array is the least
- *		significant.  If the array is too small to represent the
- *		number, high-order bits are truncated; if the array is too
- *		large, high order bytes are sign-extended.
- */
-
-void mp_storeb2c(const mp *m, void *pv, size_t sz)
-{
-  if (MP_NEGP(m))
-    mpx_storeb2cn(m->v, m->vl, pv, sz);
-  else
-    mpx_storeb(m->v, m->vl, pv, sz);
-}
-
-/*----- That's all, folks -------------------------------------------------*/