blob: 35409b583734d7d8f9f2a62f33a583bdf58c4e16 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
//
// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//
#ifndef BOOST_BEAST_WEBSOCKET_DETAIL_PRNG_HPP
#define BOOST_BEAST_WEBSOCKET_DETAIL_PRNG_HPP
#include <boost/beast/core/detail/config.hpp>
#include <cstdint>
#include <limits>
#include <random>
namespace boost {
namespace beast {
namespace websocket {
namespace detail {
// Type-erased UniformRandomBitGenerator
// with 32-bit unsigned integer value_type
//
class prng
{
protected:
virtual ~prng() = default;
virtual prng& acquire() noexcept = 0;
virtual void release() noexcept = 0;
virtual std::uint32_t operator()() noexcept = 0;
public:
using value_type = std::uint32_t;
class ref
{
prng& p_;
public:
ref& operator=(ref const&) = delete;
~ref()
{
p_.release();
}
explicit
ref(prng& p) noexcept
: p_(p.acquire())
{
}
ref(ref const& other) noexcept
: p_(other.p_.acquire())
{
}
value_type
operator()() noexcept
{
return p_();
}
static
value_type constexpr
min() noexcept
{
return (std::numeric_limits<
value_type>::min)();
}
static
value_type constexpr
max() noexcept
{
return (std::numeric_limits<
value_type>::max)();
}
};
};
//------------------------------------------------------------------------------
// Manually seed the prngs, must be called
// before acquiring a prng for the first time.
//
BOOST_BEAST_DECL
std::uint32_t const*
prng_seed(std::seed_seq* ss = nullptr);
// Acquire a PRNG using the no-TLS implementation
//
BOOST_BEAST_DECL
prng::ref
make_prng_no_tls(bool secure);
// Acquire a PRNG using the TLS implementation
//
#ifndef BOOST_NO_CXX11_THREAD_LOCAL
BOOST_BEAST_DECL
prng::ref
make_prng_tls(bool secure);
#endif
// Acquire a PRNG using the TLS implementation if it
// is available, otherwise using the no-TLS implementation.
//
BOOST_BEAST_DECL
prng::ref
make_prng(bool secure);
} // detail
} // websocket
} // beast
} // boost
#ifdef BOOST_BEAST_HEADER_ONLY
#include <boost/beast/websocket/detail/prng.ipp>
#endif
#endif
|
