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1 | /* -*-c-*- |
2 | * | |
05dfc037 | 3 | * $Id$ |
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4 | * |
5 | * Arithmetic mod %$2^{24}$% | |
6 | * | |
7 | * (c) 2000 Mark Wooding | |
8 | */ | |
9 | ||
10 | /*----- Licensing notice --------------------------------------------------* | |
11 | * | |
12 | * Copyright (c) 2000 Mark Wooding | |
13 | * All rights reserved. | |
14 | * | |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions are | |
17 | * met: | |
18 | * | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * | |
22 | * 2, Redistributions in binary form must reproduce the above copyright | |
23 | * notice, this list of conditions and the following disclaimer in the | |
24 | * documentation and/or other materials provided with the distribution. | |
25 | * | |
26 | * 3. The name of the authors may not be used to endorse or promote | |
27 | * products derived from this software without specific prior written | |
28 | * permission. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
31 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
32 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
6b2d9d76 | 33 | * NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
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34 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
35 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
36 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
37 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
38 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | |
39 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
40 | * POSSIBILITY OF SUCH DAMAGE. | |
41 | * | |
42 | * Instead of accepting the above terms, you may redistribute and/or modify | |
43 | * this software under the terms of either the GNU General Public License, | |
44 | * or the GNU Library General Public License, published by the Free | |
45 | * Software Foundation; either version 2 of the License, or (at your | |
46 | * option) any later version. | |
47 | */ | |
48 | ||
49 | /*----- Revision history --------------------------------------------------* | |
50 | * | |
51 | * $Log: arith24.h,v $ | |
6b2d9d76 MW |
52 | * Revision 1.2 2000/07/02 15:21:20 mdw |
53 | * Fix licence text. | |
54 | * | |
e6e0e332 MW |
55 | * Revision 1.1 2000/05/21 11:28:30 mdw |
56 | * Initial check-in. | |
57 | * | |
58 | */ | |
59 | ||
60 | #ifndef ARITH24_H | |
61 | #define ARITH24_H | |
62 | ||
63 | #ifdef __cplusplus | |
64 | extern "C" { | |
65 | #endif | |
66 | ||
67 | /*----- Header files ------------------------------------------------------*/ | |
68 | ||
69 | #ifndef BITS_H | |
70 | # include "bits.h" | |
71 | #endif | |
72 | ||
73 | /*----- Functions provided ------------------------------------------------*/ | |
74 | ||
75 | /* --- @inv24@ --- * | |
76 | * | |
77 | * Arguments: @uint24 x@ = a number to invert | |
78 | * | |
79 | * Returns: The multiplicative inverse %$x^{-1}$% of %$x$% (mod | |
80 | * %$2^{24}$%, if %$x$% is odd, or zero if %$x$% is even (and | |
81 | * hence uninvertible). | |
82 | * | |
83 | * Use: Computes multiplicative inverses mod %$2^{24}$%. | |
84 | */ | |
85 | ||
86 | extern uint24 inv24(uint24 /*x*/); | |
87 | ||
88 | /*----- That's all, folks -------------------------------------------------*/ | |
89 | ||
90 | #ifdef __cplusplus | |
91 | } | |
92 | #endif | |
93 | ||
94 | #endif |