mirror of
https://github.com/matrix-construct/construct
synced 2024-11-18 07:50:57 +01:00
150 lines
2.6 KiB
C++
150 lines
2.6 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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decltype(ircd::rand::device) ircd::rand::device
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{
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// on linux: uses RDRND or /dev/urandom
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// on windows: TODO: verify construction source
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};
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decltype(ircd::rand::mt) ircd::rand::mt
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{
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device()
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};
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decltype(ircd::rand::dict::alnum) ircd::rand::dict::alnum
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{
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"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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};
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decltype(ircd::rand::dict::alpha) ircd::rand::dict::alpha
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{
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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};
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decltype(ircd::rand::dict::upper) ircd::rand::dict::upper
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{
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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};
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decltype(ircd::rand::dict::lower) ircd::rand::dict::lower
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{
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"abcdefghijklmnopqrstuvwxyz"
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};
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decltype(ircd::rand::dict::numeric) ircd::rand::dict::numeric
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{
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"0123456789"
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};
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ircd::string_view
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ircd::rand::string(const mutable_buffer &out,
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const std::string &dict)
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noexcept
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{
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assert(!dict.empty());
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std::uniform_int_distribution<size_t> dist
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{
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0, dict.size() - 1
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};
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std::generate(data(out), data(out) + size(out), [&dict, &dist]
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() -> char
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{
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const auto &pos(dist(mt));
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assert(pos < dict.size());
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return dict[pos];
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});
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return out;
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}
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ircd::const_buffer
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ircd::rand::fill(const mutable_buffer &out)
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noexcept
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{
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uint64_t *const __restrict__ val
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{
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reinterpret_cast<uint64_t *>(data(out))
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};
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constexpr size_t word_size
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{
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sizeof(*val)
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};
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size_t i(0);
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for(; i < size(out) / word_size; ++i)
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val[i] = integer();
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for(size_t j(i * word_size); j < size(out) % word_size; ++j)
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out[j] = integer();
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return out;
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}
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template<>
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ircd::u512x1
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ircd::rand::vector()
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noexcept
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{
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return u64x8
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{
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integer(), integer(),
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integer(), integer(),
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integer(), integer(),
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integer(), integer(),
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};
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}
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template<>
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ircd::u256x1
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ircd::rand::vector()
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noexcept
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{
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return u64x4
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{
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integer(), integer(),
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integer(), integer(),
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};
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}
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template<>
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ircd::u128x1
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ircd::rand::vector()
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noexcept
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{
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return u64x2
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{
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integer(), integer()
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};
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}
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/// Random integer in range (inclusive)
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uint64_t
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ircd::rand::integer(const uint64_t &min,
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const uint64_t &max)
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noexcept
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{
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std::uniform_int_distribution<uint64_t> dist
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{
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min, max
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};
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return dist(mt);
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}
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/// Random 64-bits
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uint64_t
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ircd::rand::integer()
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noexcept
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{
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return mt();
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}
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