mirror of git://git.gnupg.org/gnupg.git
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
/* mpi-cmp.c - MPI functions
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* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG 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 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG 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, see <http://www.gnu.org/licenses/>.
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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 <string.h>
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#include "mpi-internal.h"
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int
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mpi_cmp_ui( MPI u, unsigned long v )
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{
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mpi_limb_t limb = v;
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mpi_normalize( u );
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if( !u->nlimbs && !limb )
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return 0;
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if( u->sign )
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return -1;
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if( u->nlimbs > 1 )
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return 1;
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if( u->d[0] == limb )
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return 0;
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else if( u->d[0] > limb )
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return 1;
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else
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return -1;
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}
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int
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mpi_cmp( MPI u, MPI v )
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{
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mpi_size_t usize, vsize;
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int cmp;
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if (mpi_is_opaque (u) || mpi_is_opaque (v))
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{
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if (mpi_is_opaque (u) && !mpi_is_opaque (v))
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return -1;
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if (!mpi_is_opaque (u) && mpi_is_opaque (v))
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return 1;
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if (!u->nbits && !v->nbits)
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return 0; /* Empty buffers are identical. */
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if (u->nbits < v->nbits)
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return -1;
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if (u->nbits > v->nbits)
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return 1;
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return memcmp (u->d, v->d, u->nbits);
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}
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mpi_normalize( u );
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mpi_normalize( v );
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usize = u->nlimbs;
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vsize = v->nlimbs;
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if( !u->sign && v->sign )
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return 1;
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if( u->sign && !v->sign )
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return -1;
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if( usize != vsize && !u->sign && !v->sign )
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return usize - vsize;
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if( usize != vsize && u->sign && v->sign )
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return vsize + usize;
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if( !usize )
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return 0;
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if( !(cmp=mpihelp_cmp( u->d, v->d, usize )) )
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return 0;
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if( (cmp < 0?1:0) == (u->sign?1:0))
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return 1;
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return -1;
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}
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