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util.hpp
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1#ifndef LIBFILEZILLA_UTIL_HEADER
2#define LIBFILEZILLA_UTIL_HEADER
3
4#include "libfilezilla.hpp"
5#include "time.hpp"
6
7#include <cstdint>
8
13namespace fz {
14
23void FZ_PUBLIC_SYMBOL sleep(duration const& d);
24
29void FZ_PUBLIC_SYMBOL yield();
30
35int64_t FZ_PUBLIC_SYMBOL random_number(int64_t min, int64_t max);
36
41std::vector<uint8_t> FZ_PUBLIC_SYMBOL random_bytes(size_t size);
42
43void FZ_PUBLIC_SYMBOL random_bytes(size_t size, uint8_t* destination);
44
51uint64_t FZ_PUBLIC_SYMBOL bitscan(uint64_t v);
52
59uint64_t FZ_PUBLIC_SYMBOL bitscan_reverse(uint64_t v);
60
66bool FZ_PUBLIC_SYMBOL equal_consttime(std::basic_string_view<uint8_t> const& lhs, std::basic_string_view<uint8_t> const& rhs);
67
68template <typename First, typename Second,
69 std::enable_if_t<sizeof(typename First::value_type) == sizeof(uint8_t) &&
70 sizeof(typename Second::value_type) == sizeof(uint8_t)>* = nullptr>
71inline bool equal_consttime(First const& lhs, Second const& rhs)
72{
73 return equal_consttime(std::basic_string_view<uint8_t>(reinterpret_cast<uint8_t const*>(lhs.data()), lhs.size()),
74 std::basic_string_view<uint8_t>(reinterpret_cast<uint8_t const*>(rhs.data()), rhs.size()));
75}
76
91template<typename T, typename std::enable_if_t<std::is_final_v<T>>* = nullptr>
92T& move_assign_through_move_constructor(T* p, T&& op) noexcept
93{
94 p->~T();
95 new (p)T(std::move(op));
96 return *p;
97}
98
99}
100
101#endif
The duration class represents a time interval in milliseconds.
Definition: time.hpp:291
Sets some global macros and further includes string.hpp.
The namespace used by libfilezilla.
Definition: apply.hpp:17
std::vector< uint8_t > random_bytes(size_t size)
Get random uniformly distributed bytes.
T & move_assign_through_move_constructor(T *p, T &&op) noexcept
Definition: util.hpp:92
void yield()
Relinquish control for a brief amount of time.
uint64_t bitscan(uint64_t v)
Returns index of the least-significant set bit.
int64_t random_number(int64_t min, int64_t max)
Get a secure random integer uniformly distributed in the closed interval [min, max].
void sleep(duration const &d)
Sleep current thread for the specified duration.
uint64_t bitscan_reverse(uint64_t v)
Returns index of the most-significant set bit.
bool equal_consttime(std::basic_string_view< uint8_t > const &lhs, std::basic_string_view< uint8_t > const &rhs)
Secure equality test in constant time.
Assorted classes dealing with time.