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Werner Koch
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326
mpi/mpiutil.c
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326
mpi/mpiutil.c
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/* mpiutil.c - Utility functions for MPI
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* Copyright (c) 1997 by Werner Koch (dd9jn)
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*
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* This file is part of G10.
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*
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* G10 is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* G10 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "mpi.h"
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#include "mpi-internal.h"
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#include "memory.h"
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#include "util.h"
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#ifdef M_DEBUG
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#undef mpi_alloc
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#undef mpi_alloc_secure
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#undef mpi_free
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#endif
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typedef struct unused_obj {
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struct unused_obj *next;
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unsigned length;
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union {
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MPI mpi;
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mpi_limb_t *limb;
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} u;
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} *unused_obj_t;
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static unused_obj_t unused_objs;
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static unused_obj_t unused_mpis;
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static unused_obj_t unused_limbs;
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MPI
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#ifdef M_DEBUG
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mpi_debug_alloc( unsigned nlimbs, const char *info )
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#else
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mpi_alloc( unsigned nlimbs )
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#endif
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{
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MPI a;
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if( unused_mpis ) {
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unused_obj_t u;
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if( DBG_MEMORY )
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log_debug("mpi_alloc(%lu) reusing\n", nlimbs*BITS_PER_MPI_LIMB );
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a = unused_mpis->u.mpi;
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u = unused_mpis;
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unused_mpis = unused_mpis->next;
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u->next = unused_objs;
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unused_objs = u;
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}
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else {
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if( DBG_MEMORY )
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log_debug("mpi_alloc(%lu) new\n", nlimbs*BITS_PER_MPI_LIMB );
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#ifdef M_DEBUG
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a = m_debug_alloc( sizeof *a, info );
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#else
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a = m_alloc( sizeof *a );
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#endif
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}
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#ifdef M_DEBUG
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a->d = mpi_debug_alloc_limb_space( nlimbs, info );
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#else
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a->d = mpi_alloc_limb_space( nlimbs );
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#endif
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a->alloced = nlimbs;
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a->nlimbs = 0;
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a->sign = 0;
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return a;
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}
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void
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mpi_m_check( MPI a )
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{
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m_check(a);
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m_check(a->d);
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}
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MPI
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#ifdef M_DEBUG
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mpi_debug_alloc_secure( unsigned nlimbs, const char *info )
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#else
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mpi_alloc_secure( unsigned nlimbs )
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#endif
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{
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MPI a;
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a = m_alloc( sizeof *a );
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#ifdef M_DEBUG
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a->d = m_debug_alloc_secure( nlimbs * sizeof(mpi_limb_t), info );
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#else
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a->d = m_alloc_secure( nlimbs * sizeof(mpi_limb_t) );
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#endif
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a->alloced = nlimbs;
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a->nlimbs = 0;
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a->sign = 0;
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return a;
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}
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mpi_ptr_t
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#ifdef M_DEBUG
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mpi_debug_alloc_limb_space( unsigned nlimbs, const char *info )
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#else
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mpi_alloc_limb_space( unsigned nlimbs )
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#endif
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{
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unused_obj_t u;
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size_t len = nlimbs * sizeof(mpi_limb_t);
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for(u=unused_limbs; u; u = u->next )
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if( u->length >= len ) {
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u->length = 0;
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if( DBG_MEMORY )
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log_debug("mpi_alloc_limb_space(%lu) reusing\n", len*8 );
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return u->u.limb;
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}
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if( DBG_MEMORY )
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log_debug("mpi_alloc_limb_space(%u) new\n", len*8 );
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#ifdef M_DEBUG
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return m_debug_alloc( len, info );
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#else
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return m_alloc( len );
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#endif
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}
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void
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#ifdef M_DEBUG
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mpi_debug_free_limb_space( mpi_ptr_t a, const char *info )
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#else
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mpi_free_limb_space( mpi_ptr_t a )
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#endif
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{
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unused_obj_t u;
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if( !a )
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return;
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if( DBG_MEMORY )
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log_debug("mpi_free_limb_space of size %lu\n", (ulong)m_size(a)*8 );
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for(u=unused_limbs; u; u = u->next )
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if( !u->length ) {
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u->length = m_size(a);
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u->u.limb = a;
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return;
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}
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if( (u=unused_objs) )
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unused_objs = unused_objs->next;
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else
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u = m_alloc( sizeof *u );
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u->length = m_size(a);
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u->u.limb = a;
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u->next = unused_limbs;
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unused_limbs = u;
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}
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void
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mpi_assign_limb_space( MPI a, mpi_ptr_t ap, unsigned nlimbs )
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{
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mpi_free_limb_space(a->d);
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a->d = ap;
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a->alloced = nlimbs;
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}
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/****************
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* Resize the array of A to NLIMBS. the additional space is cleared
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* (set to 0) [done by m_realloc()]
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*/
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void
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#ifdef M_DEBUG
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mpi_debug_resize( MPI a, unsigned nlimbs, const char *info )
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#else
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mpi_resize( MPI a, unsigned nlimbs )
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#endif
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{
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if( nlimbs <= a->alloced )
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return; /* no need to do it */
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#ifdef M_DEBUG
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if( a->d )
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a->d = m_debug_realloc(a->d, nlimbs * sizeof(mpi_limb_t), info );
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else
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a->d = m_debug_alloc_clear( nlimbs * sizeof(mpi_limb_t), info );
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#else
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if( a->d )
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a->d = m_realloc(a->d, nlimbs * sizeof(mpi_limb_t) );
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else
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a->d = m_alloc_clear( nlimbs * sizeof(mpi_limb_t) );
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#endif
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a->alloced = nlimbs;
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}
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void
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mpi_clear( MPI a )
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{
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a->nlimbs = 0;
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}
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void
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#ifdef M_DEBUG
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mpi_debug_free( MPI a, const char *info )
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#else
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mpi_free( MPI a )
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#endif
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{
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unused_obj_t u;
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if( !a )
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return;
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if( DBG_MEMORY )
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log_debug("mpi_free\n" );
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#ifdef M_DEBUG
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mpi_debug_free_limb_space(a->d, info);
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#else
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mpi_free_limb_space(a->d);
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#endif
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if( (u=unused_objs) )
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unused_objs = unused_objs->next;
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else
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u = m_alloc( sizeof *u );
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u->u.mpi = a;
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u->next = unused_mpis;
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unused_mpis = u;
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}
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MPI
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#ifdef M_DEBUG
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mpi_debug_copy( MPI a, const char *info )
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#else
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mpi_copy( MPI a )
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#endif
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{
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int i;
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MPI b;
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if( a ) {
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#ifdef M_DEBUG
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b = mpi_debug_alloc( a->nlimbs, info );
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#else
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b = mpi_alloc( a->nlimbs );
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#endif
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b->nlimbs = a->nlimbs;
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for(i=0; i < b->nlimbs; i++ )
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b->d[i] = a->d[i];
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}
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else
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b = NULL;
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return b;
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}
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void
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mpi_set( MPI w, MPI u)
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{
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mpi_ptr_t wp, up;
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mpi_size_t usize = u->nlimbs;
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int usign = u->sign;
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RESIZE_IF_NEEDED(w, usize);
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wp = w->d;
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up = u->d;
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MPN_COPY( wp, up, usize );
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w->nlimbs = usize;
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w->sign = usign;
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}
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void
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mpi_set_ui( MPI w, unsigned long u)
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{
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RESIZE_IF_NEEDED(w, 1);
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w->d[0] = u;
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w->nlimbs = u? 1:0;
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w->sign = 0;
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}
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MPI
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mpi_alloc_set_ui( unsigned long u)
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{
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#ifdef M_DEBUG
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MPI w = mpi_debug_alloc(1,"alloc_set_ui");
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#else
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MPI w = mpi_alloc(1);
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#endif
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w->d[0] = u;
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w->nlimbs = u? 1:0;
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w->sign = 0;
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return w;
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}
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void
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mpi_swap( MPI a, MPI b)
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{
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MPI x;
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x = a; a = b; b = x;
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}
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