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7e8dec91 DK |
1 | /* mpi-cmp.c - MPI functions |
2 | * Copyright (C) 1998, 1999 Free Software Foundation, Inc. | |
3 | * | |
4 | * This file is part of GnuPG. | |
5 | * | |
6 | * GnuPG is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * GnuPG is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA | |
19 | */ | |
20 | ||
21 | #include "mpi-internal.h" | |
22 | ||
23 | int mpi_cmp_ui(MPI u, unsigned long v) | |
24 | { | |
25 | mpi_limb_t limb = v; | |
26 | ||
27 | mpi_normalize(u); | |
28 | if (!u->nlimbs && !limb) | |
29 | return 0; | |
30 | if (u->sign) | |
31 | return -1; | |
32 | if (u->nlimbs > 1) | |
33 | return 1; | |
34 | ||
35 | if (u->d[0] == limb) | |
36 | return 0; | |
37 | else if (u->d[0] > limb) | |
38 | return 1; | |
39 | else | |
40 | return -1; | |
41 | } | |
42 | ||
43 | int mpi_cmp(MPI u, MPI v) | |
44 | { | |
45 | mpi_size_t usize, vsize; | |
46 | int cmp; | |
47 | ||
48 | mpi_normalize(u); | |
49 | mpi_normalize(v); | |
50 | usize = u->nlimbs; | |
51 | vsize = v->nlimbs; | |
52 | if (!u->sign && v->sign) | |
53 | return 1; | |
54 | if (u->sign && !v->sign) | |
55 | return -1; | |
56 | if (usize != vsize && !u->sign && !v->sign) | |
57 | return usize - vsize; | |
58 | if (usize != vsize && u->sign && v->sign) | |
59 | return vsize + usize; | |
60 | if (!usize) | |
61 | return 0; | |
62 | cmp = mpihelp_cmp(u->d, v->d, usize); | |
63 | if (!cmp) | |
64 | return 0; | |
65 | if ((cmp < 0 ? 1 : 0) == (u->sign ? 1 : 0)) | |
66 | return 1; | |
67 | return -1; | |
68 | } |