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/* mpi-cmp.c - MPI functions
* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG 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 a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mpi-internal.h"
int
mpi_cmp_ui( MPI u, unsigned long v )
{
mpi_limb_t limb = v;
mpi_normalize( u );
if( !u->nlimbs && !limb )
return 0;
if( u->sign )
return -1;
if( u->nlimbs > 1 )
return 1;
if( u->d[0] == limb )
return 0;
else if( u->d[0] > limb )
return 1;
else
return -1;
}
int
mpi_cmp( MPI u, MPI v )
{
mpi_size_t usize, vsize;
int cmp;
if (mpi_is_opaque (u) || mpi_is_opaque (v))
{
if (mpi_is_opaque (u) && !mpi_is_opaque (v))
return -1;
if (!mpi_is_opaque (u) && mpi_is_opaque (v))
return 1;
if (!u->nbits && !v->nbits)
return 0; /* Empty buffers are identical. */
if (u->nbits < v->nbits)
return -1;
if (u->nbits > v->nbits)
return 1;
return memcmp (u->d, v->d, u->nbits);
}
mpi_normalize( u );
mpi_normalize( v );
usize = u->nlimbs;
vsize = v->nlimbs;
if( !u->sign && v->sign )
return 1;
if( u->sign && !v->sign )
return -1;
if( usize != vsize && !u->sign && !v->sign )
return usize - vsize;
if( usize != vsize && u->sign && v->sign )
return vsize + usize;
if( !usize )
return 0;
if( !(cmp=mpihelp_cmp( u->d, v->d, usize )) )
return 0;
if( (cmp < 0?1:0) == (u->sign?1:0))
return 1;
return -1;
}
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