Integral and enum serialization

include/metadump.hpp

@@ -1,5 +0,0 @@
-#pragma once
-
-namespace metadump {
-
-}

include/metadump/metadump.hpp

@@ -0,0 +1,3 @@
+#pragma once
+#include <metadump/mono.hpp>
+#include <metadump/multi.hpp>

include/metadump/mono.hpp

@@ -0,0 +1,131 @@
+#pragma once
+#include <cstddef>
+#include <cstdint>
+#include <type_traits>
+#include <concepts>
+#include <bit>
+#include <cstring>
+
+namespace metadump {
+
+constexpr std::size_t SIZE_DYNAMIC = 0;
+
+template<std::size_t SIZE = SIZE_DYNAMIC>
+struct serializable {
+	constexpr std::size_t serial_size() const { return SIZE; };
+	virtual bool serial_dump(uint8_t* data) const = 0;
+	virtual bool serial_load(const uint8_t* data) = 0;
+};
+
+template<>
+struct serializable<SIZE_DYNAMIC> {
+	virtual std::size_t serial_size() const = 0;
+	virtual bool serial_dump(uint8_t* data, std::size_t n) const = 0;
+	virtual bool serial_load(const uint8_t* data, std::size_t n) = 0;
+};
+
+namespace mono {
+
+// Concepts to determine serialization method
+
+namespace typeswitch {
+
+template<typename T>
+concept integral = std::is_integral_v<T>;
+
+template<typename T>
+concept enumeration = std::is_enum_v<T>;
+
+/*
+template<typename I, template<typename...> typename T>
+struct is_specialization : std::false_type{};
+
+template<template<typename...> typename T, typename... IArgs>
+struct is_specialization<T<IArgs...>, T> : std::true_type{};
+
+template<typename T>
+concept is_serializable = std::is_base_of_v<Serializable, T>;
+
+is_(dynamic/fixed)_serializable
+
+template<typename T>
+concept is_container = is_specialization<T, std::vector>::value; // list, ...
+
+is_(dynamic/fixed)_container
+
+template<typename T>
+concept is_forced_default = is_specialization<T, SerialForcedDefault>::value;
+
+template<typename T>
+concept is_default = (!serial_integral<T> && !serial_enum<T> && !serial_serializable<T> &&
+	!serial_container<T> && !serial_forced_default<T>);
+
+default -> reflection to serialize all public members
+*/
+
+}
+
+template<typename T>
+struct serializer;
+
+// Integral values -> convert to LITTLE endian
+template<typeswitch::integral T>
+struct serializer<T> {
+	static constexpr bool SERIAL_SIZE_DYNAMIC = false;
+
+	static constexpr std::size_t serial_size() {
+		return sizeof(T);
+	}
+
+	static bool dump(uint8_t* data, const T& v) {
+		T tmp; // Little endian
+		if constexpr (std::endian::native == std::endian::little)
+			tmp = v;
+		else if constexpr (std::endian::native == std::endian::big)
+			tmp = std::byteswap<T>(v);
+		else
+			return false;
+
+		std::memcpy(data, &tmp, sizeof(T));
+		return true;
+	}
+
+	static bool load(const uint8_t* data, T& v) {
+		T tmp; // Little endian
+		std::memcpy(&tmp, data, sizeof(T));
+
+		if constexpr (std::endian::native == std::endian::little)
+			v = tmp;
+		else if constexpr (std::endian::native == std::endian::big)
+			v = std::byteswap<T>(tmp);
+		else
+			return false;
+
+		return true;
+	}
+};
+
+// Enum serialization -> LITTLE endian integer
+template<typeswitch::enumeration T>
+struct serializer<T> {
+	static constexpr bool SERIAL_SIZE_DYNAMIC = false;
+	using INTEGRAL_TYPE = std::underlying_type_t<T>;
+
+	static constexpr std::size_t serial_size() {
+		return serializer<INTEGRAL_TYPE>::serial_size();
+	}
+
+	static bool dump(uint8_t* data, const T& v) {
+		const INTEGRAL_TYPE& i = reinterpret_cast<const INTEGRAL_TYPE&>(v);
+		return serializer<INTEGRAL_TYPE>::dump(data, i);
+	}
+
+	static bool load(const uint8_t* data, T& v) {
+		INTEGRAL_TYPE& i = reinterpret_cast<INTEGRAL_TYPE&>(v);
+		return serializer<INTEGRAL_TYPE>::load(data, i);
+	}
+};
+
+}
+
+}

include/metadump/multi.hpp

@@ -0,0 +1,10 @@
+#pragma once
+
+namespace metadump {
+
+template<typename... Ts>
+class buffer {
+	// iovec array and per-component buffers
+};
+
+}

test/CMakeLists.txt

@@ -1,2 +1,2 @@
-add_executable(metadump_test_simple simple.cpp)
-target_link_libraries(metadump_test_simple PRIVATE metadump GTest::GTest)
+add_executable(metadump_mono mono.cpp)
+target_link_libraries(metadump_mono PRIVATE metadump GTest::GTest)

test/mono.cpp

@@ -0,0 +1,68 @@
+#include <gtest/gtest.h>
+#include <metadump/metadump.hpp>
+
+template<typename T>
+using serializer = metadump::mono::serializer<T>;
+
+TEST(MONO, INTEGRAL) {
+	uint8_t buf[8];
+
+	// Serialization of uint8_t
+
+	static_assert(!serializer<uint8_t>::SERIAL_SIZE_DYNAMIC, "Integral serialization size should be fixed (uint8_t)!");
+	static_assert(serializer<uint8_t>::serial_size() == sizeof(uint8_t), "Integral serialization size is incorrect (uint8_t)!");
+	uint8_t a8 = 0x01, b8 = 0;
+
+	ASSERT_TRUE(serializer<uint8_t>::dump(buf, a8)) << "Failed to dump uint8_t!";
+	ASSERT_TRUE(serializer<uint8_t>::load(buf, b8)) << "Failed to load uint8_t!";
+	ASSERT_EQ(a8, b8) << "Deserialized uint8_t does not match serialization input!";
+
+	// Serialization of uint16_t
+
+	static_assert(!serializer<uint16_t>::SERIAL_SIZE_DYNAMIC, "Integral serialization size should be fixed (uint16_t)!");
+	static_assert(serializer<uint16_t>::serial_size() == sizeof(uint16_t), "Integral serialization size is incorrect (uint16_t)!");
+	uint16_t a16 = 0x0102, b16 = 0;
+
+	ASSERT_TRUE(serializer<uint16_t>::dump(buf, a16)) << "Failed to dump uint16_t!";
+	ASSERT_TRUE(serializer<uint16_t>::load(buf, b16)) << "Failed to load uint16_t!";
+	ASSERT_EQ(a16, b16) << "Deserialized uint16_t does not match serialization input!";
+
+	// Serialization of uint32_t
+
+	static_assert(!serializer<uint32_t>::SERIAL_SIZE_DYNAMIC, "Integral serialization size should be fixed (uint32_t)!");
+	static_assert(serializer<uint32_t>::serial_size() == sizeof(uint32_t), "Integral serialization size is incorrect (uint32_t)!");
+	uint32_t a32 = 0x01020304, b32 = 0;
+
+	ASSERT_TRUE(serializer<uint32_t>::dump(buf, a32)) << "Failed to dump uint32_t!";
+	ASSERT_TRUE(serializer<uint32_t>::load(buf, b32)) << "Failed to load uint32_t!";
+	ASSERT_EQ(a32, b32) << "Deserialized uint32_t does not match serialization input!";
+
+	// Serialization of uint64_t
+
+	static_assert(!serializer<uint64_t>::SERIAL_SIZE_DYNAMIC, "Integral serialization size should be fixed (uint64_t)!");
+	static_assert(serializer<uint64_t>::serial_size() == sizeof(uint64_t), "Integral serialization size is incorrect (uint64_t)!");
+	uint64_t a64 = 0x0102030405060708ull, b64 = 0;
+
+	ASSERT_TRUE(serializer<uint64_t>::dump(buf, a64)) << "Failed to dump uint64_t!";
+	ASSERT_TRUE(serializer<uint64_t>::load(buf, b64)) << "Failed to load uint64_t!";
+	ASSERT_EQ(a64, b64) << "Deserialized uint64_t does not match serialization input!";
+}
+
+TEST(MONO, ENUM) {
+	uint8_t buf[4];
+	enum class ENUM : uint32_t { A, B, C, D, E };
+
+	static_assert(!serializer<ENUM>::SERIAL_SIZE_DYNAMIC, "Enum serialization size should be fixed!");
+	static_assert(serializer<ENUM>::serial_size() == sizeof(uint32_t), "Enum serialization size does not match internal type!");
+
+	ENUM a = ENUM::D, b = ENUM::A;
+
+	ASSERT_TRUE(serializer<ENUM>::dump(buf, a)) << "Failed to dump enum!";
+	ASSERT_TRUE(serializer<ENUM>::load(buf, b)) << "Failed to load enum!";
+	ASSERT_EQ(a, b) << "Deserialized enum does not match serialization input!";
+}
+
+int main(int argc, char** argv) {
+	testing::InitGoogleTest(&argc, argv);
+	return RUN_ALL_TESTS();
+}

test/simple.cpp

@@ -1,11 +0,0 @@
-#include <gtest/gtest.h>
-#include "metadump.hpp"
-
-TEST(METADUMP_SIMPLE, EMPTY) {
-	ASSERT_TRUE(false) << "Tests not implemented!";
-}
-
-int main(int argc, char** argv) {
-	testing::InitGoogleTest(&argc, argv);
-	return RUN_ALL_TESTS();
-}