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258ba71363
This change silences a dummy warning, which is breaking builds with GCC 12 (but not newer versions of GCC) in release mode only.
85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2014, Vinnie Falco <vinnie.falco@gmail.com>
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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 appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef BEAST_RANDOM_RNGFILL_H_INCLUDED
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#define BEAST_RANDOM_RNGFILL_H_INCLUDED
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#include <xrpl/beast/utility/instrumentation.h>
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#include <array>
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#include <cstdint>
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#include <cstring>
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#include <type_traits>
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namespace beast {
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template <class Generator>
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void
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rngfill(void* buffer, std::size_t bytes, Generator& g)
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{
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using result_type = typename Generator::result_type;
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while (bytes >= sizeof(result_type))
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{
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auto const v = g();
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std::memcpy(buffer, &v, sizeof(v));
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buffer = reinterpret_cast<std::uint8_t*>(buffer) + sizeof(v);
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bytes -= sizeof(v);
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}
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XRPL_ASSERT(
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bytes < sizeof(result_type), "beast::rngfill(void*) : maximum bytes");
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#ifdef __GNUC__
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// gcc 11.1 (falsely) warns about an array-bounds overflow in release mode.
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// gcc 12.1 (also falsely) warns about an string overflow in release mode.
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Warray-bounds"
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#pragma GCC diagnostic ignored "-Wstringop-overflow"
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#endif
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if (bytes > 0)
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{
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auto const v = g();
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std::memcpy(buffer, &v, bytes);
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}
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#ifdef __GNUC__
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#pragma GCC diagnostic pop
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#endif
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}
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template <
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class Generator,
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std::size_t N,
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class = std::enable_if_t<N % sizeof(typename Generator::result_type) == 0>>
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void
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rngfill(std::array<std::uint8_t, N>& a, Generator& g)
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{
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using result_type = typename Generator::result_type;
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auto i = N / sizeof(result_type);
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result_type* p = reinterpret_cast<result_type*>(a.data());
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while (i--)
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*p++ = g();
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}
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} // namespace beast
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#endif
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