d3409d5e |
1 | /* -*-c-*- |
2 | * |
5fbe3846 |
3 | * $Id: mp-misc.c,v 1.3 2000/07/29 17:03:31 mdw Exp $ |
d3409d5e |
4 | * |
5 | * Miscellaneous multiprecision support functions |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: mp-misc.c,v $ |
5fbe3846 |
33 | * Revision 1.3 2000/07/29 17:03:31 mdw |
34 | * Add support for left-to-right bitscanning, for use in modular |
35 | * exponentiation. |
36 | * |
d34decd2 |
37 | * Revision 1.2 2000/06/17 11:45:09 mdw |
38 | * Major memory management overhaul. Added arena support. Use the secure |
39 | * arena for secret integers. Replace and improve the MP management macros |
40 | * (e.g., replace MP_MODIFY by MP_DEST). |
41 | * |
d3409d5e |
42 | * Revision 1.1 1999/11/17 18:02:16 mdw |
43 | * New multiprecision integer arithmetic suite. |
44 | * |
45 | */ |
46 | |
47 | /*----- Header files ------------------------------------------------------*/ |
48 | |
49 | #include "mp.h" |
50 | |
d3409d5e |
51 | /*----- Basic manipulation ------------------------------------------------*/ |
52 | |
53 | /* --- @mp_shrink@ --- * |
54 | * |
55 | * Arguments: @mp *m@ = pointer to a multiprecision integer |
56 | * |
57 | * Returns: --- |
58 | * |
59 | * Use: Reduces the recorded length of an integer. This doesn't |
60 | * reduce the amount of memory used, although it can improve |
61 | * performance a bit. To reduce memory, use @mp_minimize@ |
62 | * instead. This can't change the value of an integer, and is |
63 | * therefore safe to use even when there are multiple |
64 | * references. |
65 | */ |
66 | |
67 | void mp_shrink(mp *m) { MP_SHRINK(m); } |
68 | |
69 | /* --- @mp_minimize@ --- * |
70 | * |
71 | * Arguments: @mp *m@ = pointer to a multiprecision integer |
72 | * |
73 | * Returns: --- |
74 | * |
75 | * Use: Reduces the amount of memory an integer uses. It's best to |
76 | * do this to numbers which aren't going to change in the |
77 | * future. |
78 | */ |
79 | |
80 | void mp_minimize(mp *m) |
81 | { |
82 | MP_SHRINK(m); |
83 | MP_RESIZE(m, MP_LEN(m)); |
84 | } |
85 | |
86 | /*----- Bit scanning ------------------------------------------------------*/ |
87 | |
88 | /* --- @mp_scan@ --- * |
89 | * |
90 | * Arguments: @mpscan *sc@ = pointer to bitscanner block |
91 | * @const mp *m@ = pointer to a multiprecision integer |
92 | * |
93 | * Returns: --- |
94 | * |
95 | * Use: Initializes a bitscanner on a multiprecision integer. |
96 | */ |
97 | |
98 | void mp_scan(mpscan *sc, const mp *m) { MP_SCAN(sc, m); } |
99 | |
5fbe3846 |
100 | /* --- @mp_scan@ --- * |
101 | * |
102 | * Arguments: @mpscan *sc@ = pointer to bitscanner block |
103 | * @const mp *m@ = pointer to a multiprecision integer |
104 | * |
105 | * Returns: --- |
106 | * |
107 | * Use: Initializes a reverse bitscanner on a multiprecision |
108 | * integer. |
109 | */ |
110 | |
111 | void mp_rscan(mpscan *sc, const mp *m) { MP_RSCAN(sc, m); } |
112 | |
d3409d5e |
113 | /*----- That's all, folks -------------------------------------------------*/ |