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construct/ircd/rand.cc

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// 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.
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decltype(ircd::rand::device) ircd::rand::device
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{
// on linux: uses RDRND or /dev/urandom
// on windows: TODO: verify construction source
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};
decltype(ircd::rand::mt) ircd::rand::mt
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{
device()
};
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decltype(ircd::rand::dict::alnum) ircd::rand::dict::alnum
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{
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
};
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decltype(ircd::rand::dict::alpha) ircd::rand::dict::alpha
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{
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
};
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decltype(ircd::rand::dict::upper) ircd::rand::dict::upper
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{
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
};
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decltype(ircd::rand::dict::lower) ircd::rand::dict::lower
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{
"abcdefghijklmnopqrstuvwxyz"
};
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decltype(ircd::rand::dict::numeric) ircd::rand::dict::numeric
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{
"0123456789"
};
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std::string
ircd::rand::string(const std::string &dict,
const size_t &len)
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{
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return ircd::util::string(len, [&dict]
(const mutable_buffer &buf)
{
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return string(dict, buf);
});
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}
ircd::string_view
ircd::rand::string(const std::string &dict,
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const mutable_buffer &out)
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{
std::uniform_int_distribution<size_t> dist
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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]
() -> char
{
return dict.at(dist(mt));
});
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return out;
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}