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

diff --git a/mp-mem.c b/mp-mem.c
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-/* -*-c-*-
- *
- * $Id: mp-mem.c,v 1.8 2004/04/08 16:17:32 mdw Exp $
- *
- * Memory management for multiprecision numbers
- *
- * (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 <mLib/sub.h>
-
-
-#include "mp.h"
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @mp_new@ --- *
- *
- * Arguments:	@size_t sz@ = size of vector required
- *		@unsigned f@ = flags to set
- *
- * Returns:	Pointer to a new MP structure.
- *
- * Use:		Allocates a new multiprecision integer.  The data space is
- *		allocated from either the standard global or secret arena,
- *		depending on the initial flags requested.
- */
-
-mp *mp_new(size_t sz, unsigned f)
-{
-  mp *m = CREATE(mp);
-  m->a = (f & MP_BURN) ? MPARENA_SECURE : MPARENA_GLOBAL;
-  m->v = mpalloc(m->a, sz);
-  m->vl = m->v + sz;
-  m->sz = sz;
-  m->f = f & ~(MP_CONST | MP_DESTROYED);
-  m->ref = 1;
-  return (m);
-}
-
-/* --- @mp_create@ --- *
- *
- * Arguments:	@size_t sz@ = size of vector required
- *
- * Returns:	Pointer to pristine new MP structure with enough memory
- *		bolted onto it.
- *
- * Use:		Creates a new multiprecision integer, initially zero.  The
- *		integer has a single reference.
- */
-
-mp *mp_create(size_t sz)
-{
-  mp *m = CREATE(mp);
-  m->v = mpalloc(MPARENA_GLOBAL, sz);
-  m->vl = m->v + sz;
-  m->sz = sz;
-  m->a = MPARENA_GLOBAL;
-  m->f = MP_UNDEF;
-  m->ref = 1;
-  return (m);
-}
-
-/* --- @mp_createsecure@ --- *
- *
- * Arguments:	@size_t sz@ = size of vector required
- *
- * Returns:	Pointer to pristine new MP structure with enough memory
- *		bolted onto it.
- *
- * Use:		Creates a new multiprecision integer with indeterminate
- *		contents.  The integer has a single reference.  The integer's
- *		data space is allocated from the secure arena.  Its burn flag
- *		is set.
- */
-
-mp *mp_createsecure(size_t sz)
-{
-  mp *m = CREATE(mp);
-  m->v = mpalloc(MPARENA_SECURE, sz);
-  m->vl = m->v + sz;
-  m->sz = sz;
-  m->a = MPARENA_SECURE;
-  m->f = MP_UNDEF | MP_BURN;
-  m->ref = 1;
-  return (m);
-}
-
-/* --- @mp_build@ --- *
- *
- * Arguments:	@mp *m@ = pointer to an MP block to fill in
- *		@mpw *v@ = pointer to a word array
- *		@mpw *vl@ = pointer just past end of array
- *
- * Returns:	---
- *
- * Use:		Creates a multiprecision integer representing some smallish
- *		number.  You must provide storage for the number and dispose
- *		of it when you've finished with it.  The number is marked as
- *		constant while it exists.
- */
-
-void mp_build(mp *m, mpw *v, mpw *vl)
-{
-  m->v = v;
-  m->vl = vl;
-  m->sz = vl - v;
-  m->a = MPARENA_GLOBAL;
-  m->f = MP_CONST;
-  m->ref = 1;
-}
-
-/* --- @mp_destroy@ --- *
- *
- * Arguments:	@mp *m@ = pointer to a multiprecision integer
- *
- * Returns:	---
- *
- * Use:		Destroys a multiprecision integer. The reference count isn't
- *		checked.  Don't use this function if you don't know what
- *		you're doing: use @mp_drop@ instead.
- */
-
-void mp_destroy(mp *m)
-{
-  assert(((void)"Destroying a free integer", !(m->f & MP_DESTROYED)));
-  assert(((void)"Attempted to destroy a constant", !(m->f & MP_CONST)));
-  if (m->f & MP_BURN)
-    memset(m->v, 0, MPWS(m->sz));
-  mpfree(m->a, m->v);
-  m->f |= MP_DESTROYED;
-  DESTROY(m);
-}
-
-/* --- @mp_copy@ --- *
- *
- * Arguments:	@mp *m@ = pointer to a multiprecision integer
- *
- * Returns:	A copy of the given multiprecision integer.
- *
- * Use:		Copies the given integer.  In fact you just get another
- *		reference to the same old one again.
- */
-
-mp *mp_copy(mp *m) { return MP_COPY(m); }
-
-/* --- @mp_drop@ --- *
- *
- * Arguments:	@mp *m@ = pointer to a multiprecision integer
- *
- * Returns:	---
- *
- * Use:		Drops a reference to an integer which isn't wanted any more.
- *		If there are no more references, the integer is destroyed.
- */
-
-void mp_drop(mp *m) { if (m) MP_DROP(m); }
-
-/* --- @mp_split@ --- *
- *
- * Arguments:	@mp *m@ = pointer to a multiprecision integer
- *
- * Returns:	A reference to the same integer, possibly with a different
- *		address.
- *
- * Use:		Splits off a modifiable version of the integer referred to.
- */
-
-mp *mp_split(mp *m) { MP_SPLIT(m); return (m); }
-
-/* --- @mp_resize@ --- *
- *
- * Arguments:	@mp *m@ = pointer to a multiprecision integer
- *		@size_t sz@ = new size
- *
- * Returns:	---
- *
- * Use:		Changes an integer's size.  The length and value are not
- *		changed.  It is an error to
- */
-
-void mp_resize(mp *m, size_t sz) { MP_RESIZE(m, sz); }
-
-/* --- @mp_ensure@ --- *
- *
- * Arguments:	@mp *m@ = pointer to a multiprecision integer
- *		@size_t sz@ = required length
- *
- * Returns:	---
- *
- * Use:		Changes an integer's length.  If there is not enough space
- *		allocated for the new length then the size is increased.  It
- */
-
-void mp_ensure(mp *m, size_t sz) { MP_ENSURE(m, sz); }
-
-/* --- @mp_dest@ --- *
- *
- * Arguments:	@mp *m@ = a suggested destination integer
- *		@size_t sz@ = size required for result, in digits
- *		@unsigned f@ = various flags
- *
- * Returns:	A pointer to an appropriate destination.
- *
- * Use:		Converts a suggested destination into a real destination with
- *		the required properties.  If the real destination is @d@,
- *		then the following properties will hold:
- *
- *		  * @d@ will have exactly one reference.
- *
- *		  * If @m@ is not @MP_NEW@, then the contents of @m@ will not
- *		    change, unless @f@ has the @MP_UNDEF@ flag set.
- *
- *		  * If @m@ is not @MP_NEW@, then he reference count of @m@ on
- *		    entry is equal to the sum of the counts of @d@ and @m@ on
- *		    exit.
- *
- *		  * The size of @d@ will be at least @sz@.
- *
- *		  * If @f@ has the @MP_BURN@ flag set, then @d@ will be
- *		    allocated from @MPARENA_SECURE@.
- *
- *		Understanding this function is crucial to using Catacomb's
- *		multiprecision integer library effectively.
- */
-
-mp *mp_dest(mp *m, size_t sz, unsigned f)
-{
-  /* --- If no destination, make one --- */
-
-  if (m == MP_NEWSEC)
-    m = mp_new(sz, f | MP_UNDEF | MP_BURN);
-  else if (m == MP_NEW)
-    m = mp_new(sz, f | MP_UNDEF);
-  else {
-    size_t len = MP_LEN(m);
-    unsigned undef = (m->f | f) & MP_UNDEF;
-
-    /* --- If the value must be preserved, the block can't shrink --- */
-
-    if (!undef && sz < len)
-      sz = len;
-
-    /* --- Otherwise check whether the destination is suitable --- */
-
-    if (m->ref > 1 || (m->f & MP_CONST) ||
-	sz > m->sz || ((f & ~m->f) & MP_BURN)) {
-
-      /* --- No -- allocate a new buffer --- *
-       *
-       * The buffer must be secure if (a) the caller requested a secure
-       * buffer, or (b) the old buffer is secure and I'm not allowed to
-       * discard the old contents.
-       */
-
-      mparena *a;
-      mpw *v;
-
-      if ((f & MP_BURN) || (!undef && (m->f & MP_BURN)))
-	a = MPARENA_SECURE;
-      else
-	a = MPARENA_GLOBAL;
-      v = mpalloc(a, sz);
-
-      /* --- Copy the data over --- */
-
-      if (!undef) {
-	memcpy(v, m->v, MPWS(len));
-	if (sz - len > 0)
-	  memset(v + len, 0, MPWS(sz - len));
-      }
-
-      /* --- If @m@ has other references, make a new node --- *
-       *
-       * Otherwise dispose of the old buffer.
-       */
-
-      if (!(m->f & MP_CONST) && m->ref == 1) {
-	if (m->f & MP_BURN)
-	  memset(m->v, 0, MPWS(m->sz));
-	mpfree(m->a, m->v);
-      } else {
-	mp *mm = CREATE(mp);
-	mm->ref = 1;
-	mm->f = m->f;
-	m->ref--;
-	m = mm;
-      }
-
-      /* --- Fix up the node --- */
-
-      m->v = v;
-      m->vl = v + sz;
-      m->sz = sz;
-      m->f = ((m->f & ~(MP_CONST | MP_BURN)) |
-	      (f & (MP_BURN | MP_UNDEF)));
-      m->a = a;
-    }
-
-    /* --- If the number is growing in its buffer, fix it up --- */
-
-    else if (sz > len) {
-      if (!undef)
-	memset(m->vl, 0, MPWS(sz - len));
-      m->vl = m->v + sz;
-    }
-  }
-
-  /* --- Done --- */
-
-  return (m);
-}
-
-/*----- That's all, folks -------------------------------------------------*/