Prepare fuzzing engine

src/fuzzing-engine/random_generator.hpp

@@ -0,0 +1,69 @@
+#pragma once
+#include <span>
+#include <random>
+#include <cstdint>
+
+namespace fuzzer
+{
+	class random_generator
+	{
+	public:
+		random_generator();
+
+		void fill(std::span<uint8_t> data);
+		void fill(void* data, size_t size);
+
+		template <typename T>
+			requires(std::is_trivially_copyable_v<T>)
+		T get()
+		{
+			T value{};
+			this->fill(&value, sizeof(value));
+			return value;
+		}
+
+		template <typename T>
+		T get(const T& max)
+		{
+			return this->get<T>() % max;
+		}
+
+		template <typename T>
+		T get(T min, T max)
+		{
+			if (max < min)
+			{
+				std::swap(max, min);
+			}
+
+			const auto diff = max - min;
+
+			return (this->get<T>() % diff) + min;
+		}
+
+		template <typename T>
+		T get_geometric()
+		{
+			T value{0};
+
+			while (this->get<bool>())
+			{
+				++value;
+			}
+
+			return value;
+		}
+
+	private:
+		std::mt19937 rng_;
+		std::uniform_int_distribution<std::mt19937::result_type> distribution_{};
+
+		std::mt19937::result_type generate_number();
+	};
+
+	template <>
+	inline bool random_generator::get<bool>()
+	{
+		return (this->generate_number() & 1) != 0;
+	}
+}