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1d42c4f6de
Per XLS-0095, we are taking steps to rename ripple(d) to xrpl(d). This change specifically removes all copyright notices referencing Ripple, XRPLF, and certain affiliated contributors upon mutual agreement, so the notice in the LICENSE.md file applies throughout. Copyright notices referencing external contributions remain as-is. Duplicate verbiage is also removed.
56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
#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* const buffer, std::size_t const bytes, Generator& g)
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{
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using result_type = typename Generator::result_type;
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constexpr std::size_t result_size = sizeof(result_type);
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std::uint8_t* const buffer_start = static_cast<std::uint8_t*>(buffer);
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std::size_t const complete_iterations = bytes / result_size;
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std::size_t const bytes_remaining = bytes % result_size;
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for (std::size_t count = 0; count < complete_iterations; ++count)
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{
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result_type const v = g();
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std::size_t const offset = count * result_size;
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std::memcpy(buffer_start + offset, &v, result_size);
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}
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if (bytes_remaining > 0)
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{
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result_type const v = g();
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std::size_t const offset = complete_iterations * result_size;
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std::memcpy(buffer_start + offset, &v, bytes_remaining);
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}
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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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