/src/botan/build/include/botan/internal/rounding.h
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * Integer Rounding Functions |
3 | | * (C) 1999-2007 Jack Lloyd |
4 | | * |
5 | | * Botan is released under the Simplified BSD License (see license.txt) |
6 | | */ |
7 | | |
8 | | #ifndef BOTAN_ROUNDING_H_ |
9 | | #define BOTAN_ROUNDING_H_ |
10 | | |
11 | | #include <botan/types.h> |
12 | | |
13 | | namespace Botan { |
14 | | |
15 | | /** |
16 | | * Round up |
17 | | * @param n a non-negative integer |
18 | | * @param align_to the alignment boundary |
19 | | * @return n rounded up to a multiple of align_to |
20 | | */ |
21 | | inline size_t round_up(size_t n, size_t align_to) |
22 | 1.36M | { |
23 | 1.36M | BOTAN_ARG_CHECK(align_to != 0, "align_to must not be 0"); |
24 | 1.36M | |
25 | 1.36M | if(n % align_to) |
26 | 1.00M | n += align_to - (n % align_to); |
27 | 1.36M | return n; |
28 | 1.36M | } |
29 | | |
30 | | /** |
31 | | * Round down |
32 | | * @param n an integer |
33 | | * @param align_to the alignment boundary |
34 | | * @return n rounded down to a multiple of align_to |
35 | | */ |
36 | | template<typename T> |
37 | | inline constexpr T round_down(T n, T align_to) |
38 | | { |
39 | | return (align_to == 0) ? n : (n - (n % align_to)); |
40 | | } |
41 | | |
42 | | /** |
43 | | * Clamp |
44 | | */ |
45 | | inline size_t clamp(size_t n, size_t lower_bound, size_t upper_bound) |
46 | 0 | { |
47 | 0 | if(n < lower_bound) |
48 | 0 | return lower_bound; |
49 | 0 | if(n > upper_bound) |
50 | 0 | return upper_bound; |
51 | 0 | return n; |
52 | 0 | } |
53 | | |
54 | | } |
55 | | |
56 | | #endif |