mirror of
https://github.com/matrix-construct/construct
synced 2024-11-17 23:40:57 +01:00
105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
/*
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* Copyright (C) 2017 Charybdis Development Team
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* Copyright (C) 2017 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.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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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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std::string
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ircd::rand::string(const std::string &dict,
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const size_t &len)
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{
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std::string ret(len, char());
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string(dict, len, reinterpret_cast<uint8_t *>(&ret.front()));
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return ret;
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}
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ircd::string_view
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ircd::rand::string(const std::string &dict,
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const size_t &len,
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char *const &buf,
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const size_t &max)
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{
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if(unlikely(!max))
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return { buf, max };
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const auto size
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{
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std::min(len, max - 1)
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};
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buf[size] = '\0';
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return string(dict, size, reinterpret_cast<uint8_t *>(buf));
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}
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ircd::string_view
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ircd::rand::string(const std::string &dict,
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const size_t &len,
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uint8_t *const &buf)
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{
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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(buf, buf + len, [&dict, &dist]
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() -> uint8_t
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{
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return dict.at(dist(mt));
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});
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return string_view
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{
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reinterpret_cast<const char *>(buf), len
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};
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}
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