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#include "seed.hpp"
#include <random>
seed_t seed_t::system()
{
seed_t seed;
// Use system's random device for seeding.
std::random_device random_device;
std::uniform_int_distribution<std::uint8_t> distribution;
// Extract the number of bytes we need.
for (std::size_t i = 0; i < n_bytes; i++)
{
seed.m_data[i] = distribution(random_device);
}
// Done
return seed;
}
seed_t seed_t::from_bytes(std::uint8_t bytes[n_bytes])
{
seed_t seed;
// Copy
for (std::size_t i = 0; i < n_bytes; i++)
{
seed.m_data[i] = bytes[i];
}
// Done
return seed;
}
void seed_t::to_bytes(std::uint8_t bytes[n_bytes]) const
{
// Copy
for (std::size_t i = 0; i < n_bytes; i++)
{
bytes[i] = m_data[i];
}
}
void seed_t::to_uint32(std::uint32_t seed_seq_data[n_uint32]) const
{
for (std::size_t i = 0; i < n_uint32; i++)
{
// Position in the byte-oriented data.
std::size_t p = 4 * i;
// Pack m_data[p + 0], ..., m_data[p + 3] into a single uint32_t
seed_seq_data[i] = 0;
seed_seq_data[i] |= (uint32_t(m_data[p + 0]) << (0 * 8));
seed_seq_data[i] |= (uint32_t(m_data[p + 1]) << (1 * 8));
seed_seq_data[i] |= (uint32_t(m_data[p + 2]) << (2 * 8));
seed_seq_data[i] |= (uint32_t(m_data[p + 3]) << (3 * 8));
}
}
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