mirror of
https://github.com/matrix-construct/construct
synced 2024-11-25 08:12:37 +01:00
150 lines
2.6 KiB
C++
150 lines
2.6 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
decltype(ircd::rand::device) ircd::rand::device
|
|
{
|
|
// on linux: uses RDRND or /dev/urandom
|
|
// on windows: TODO: verify construction source
|
|
};
|
|
|
|
decltype(ircd::rand::mt) ircd::rand::mt
|
|
{
|
|
device()
|
|
};
|
|
|
|
decltype(ircd::rand::dict::alnum) ircd::rand::dict::alnum
|
|
{
|
|
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
|
|
};
|
|
|
|
decltype(ircd::rand::dict::alpha) ircd::rand::dict::alpha
|
|
{
|
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
|
|
};
|
|
|
|
decltype(ircd::rand::dict::upper) ircd::rand::dict::upper
|
|
{
|
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
|
|
};
|
|
|
|
decltype(ircd::rand::dict::lower) ircd::rand::dict::lower
|
|
{
|
|
"abcdefghijklmnopqrstuvwxyz"
|
|
};
|
|
|
|
decltype(ircd::rand::dict::numeric) ircd::rand::dict::numeric
|
|
{
|
|
"0123456789"
|
|
};
|
|
|
|
ircd::string_view
|
|
ircd::rand::string(const mutable_buffer &out,
|
|
const std::string &dict)
|
|
noexcept
|
|
{
|
|
assert(!dict.empty());
|
|
std::uniform_int_distribution<size_t> dist
|
|
{
|
|
0, dict.size() - 1
|
|
};
|
|
|
|
std::generate(data(out), data(out) + size(out), [&dict, &dist]
|
|
() -> char
|
|
{
|
|
const auto &pos(dist(mt));
|
|
assert(pos < dict.size());
|
|
return dict[pos];
|
|
});
|
|
|
|
return out;
|
|
}
|
|
|
|
ircd::const_buffer
|
|
ircd::rand::fill(const mutable_buffer &out)
|
|
noexcept
|
|
{
|
|
uint64_t *const __restrict__ val
|
|
{
|
|
reinterpret_cast<uint64_t *>(data(out))
|
|
};
|
|
|
|
constexpr size_t word_size
|
|
{
|
|
sizeof(*val)
|
|
};
|
|
|
|
size_t i(0);
|
|
for(; i < size(out) / word_size; ++i)
|
|
val[i] = integer();
|
|
|
|
for(size_t j(i * word_size); j < size(out) % word_size; ++j)
|
|
out[j] = integer();
|
|
|
|
return out;
|
|
}
|
|
|
|
template<>
|
|
ircd::u512x1
|
|
ircd::rand::vector()
|
|
noexcept
|
|
{
|
|
return u64x8
|
|
{
|
|
integer(), integer(),
|
|
integer(), integer(),
|
|
integer(), integer(),
|
|
integer(), integer(),
|
|
};
|
|
}
|
|
|
|
template<>
|
|
ircd::u256x1
|
|
ircd::rand::vector()
|
|
noexcept
|
|
{
|
|
return u64x4
|
|
{
|
|
integer(), integer(),
|
|
integer(), integer(),
|
|
};
|
|
}
|
|
|
|
template<>
|
|
ircd::u128x1
|
|
ircd::rand::vector()
|
|
noexcept
|
|
{
|
|
return u64x2
|
|
{
|
|
integer(), integer()
|
|
};
|
|
}
|
|
|
|
/// Random integer in range (inclusive)
|
|
uint64_t
|
|
ircd::rand::integer(const uint64_t &min,
|
|
const uint64_t &max)
|
|
noexcept
|
|
{
|
|
std::uniform_int_distribution<uint64_t> dist
|
|
{
|
|
min, max
|
|
};
|
|
|
|
return dist(mt);
|
|
}
|
|
|
|
/// Random 64-bits
|
|
uint64_t
|
|
ircd::rand::integer()
|
|
noexcept
|
|
{
|
|
return mt();
|
|
}
|