move ArrayFiller in its own file

include/sp/common/ByteSwapping.h

@@ -1,26 +1,10 @@
 #pragma once
 
-#ifdef _WIN32
-#include <winsock2.h>
-#else
-#include <arpa/inet.h>
-#endif
-
 #include <cstdint>
 
 namespace sp {
 
-template <typename T>
-void SwapBytes(T& value) {
-	char* ptr = reinterpret_cast<char*>(&value);
-	std::reverse(ptr, ptr + sizeof(T));
-}
-
-bool IsSystemBigEndian() {
-	static constexpr std::uint16_t test = 10;
-	static const bool isBigEndian = reinterpret_cast<const std::uint8_t*>(&test)[1] == 10;
-	return isBigEndian;
-}
+bool IsSystemBigEndian();
 
 /**
  * \brief Serialize value to (network byte order) big endian
@@ -29,21 +13,13 @@ template <typename T>
 void ToNetwork(T& value) {}
 
 template <>
-void ToNetwork<std::uint16_t>(std::uint16_t& value) {
-	value = htons(value);
-}
+void ToNetwork<std::uint16_t>(std::uint16_t& value);
 
 template <>
-void ToNetwork<std::uint32_t>(std::uint32_t& value) {
-	value = htonl(value);
-}
+void ToNetwork<std::uint32_t>(std::uint32_t& value);
 
 template <>
-void ToNetwork<std::uint64_t>(std::uint64_t& value) {
-	if (IsSystemBigEndian())
-		return;
-	SwapBytes(value);
-}
+void ToNetwork<std::uint64_t>(std::uint64_t& value);
 
 /**
  * \brief Deserialize value from (network byte order) big endian
@@ -52,21 +28,13 @@ template <typename T>
 void FromNetwork(T& value) {}
 
 template <>
-void FromNetwork<std::uint16_t>(std::uint16_t& value) {
-	value = ntohs(value);
-}
+void FromNetwork<std::uint16_t>(std::uint16_t& value);
 
 template <>
-void FromNetwork<std::uint32_t>(std::uint32_t& value) {
-	value = ntohl(value);
-}
+void FromNetwork<std::uint32_t>(std::uint32_t& value);
 
 template <>
-void FromNetwork<std::uint64_t>(std::uint64_t& value) {
-	if (IsSystemBigEndian())
-		return;
-	SwapBytes(value);
-}
+void FromNetwork<std::uint64_t>(std::uint64_t& value);
 
 /**
  * \brief Swap bytes if the value is any kind of integer
@@ -75,18 +43,12 @@ template <typename T>
 void TrySwapBytes(T& value) {}
 
 template <>
-void TrySwapBytes<std::uint16_t>(std::uint16_t& value) {
-	SwapBytes(value);
-}
+void TrySwapBytes<std::uint16_t>(std::uint16_t& value);
 
 template <>
-void TrySwapBytes<std::uint32_t>(std::uint32_t& value) {
-	SwapBytes(value);
-}
+void TrySwapBytes<std::uint32_t>(std::uint32_t& value);
 
 template <>
-void TrySwapBytes<std::uint64_t>(std::uint64_t& value) {
-	SwapBytes(value);
-}
+void TrySwapBytes<std::uint64_t>(std::uint64_t& value);
 
 }  // namespace sp

include/sp/default/DefaultPacketDispatcher.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <sp/default/DefaultPacket.h>
+#include <sp/default/DefaultPacketHandler.h>
+#include <sp/protocol/MessageDispatcher.h>
+
+namespace sp {
+
+using PacketDispatcher = MessageDispatcher<
+	PacketMessage::ParsedOptions::MsgIdType, 
+	PacketMessage, 
+	PacketMessage::ParsedOptions::HandlerType::HandlerT
+	>;
+
+}  // namespace sp

include/sp/extensions/Compress.h

@@ -0,0 +1,37 @@
+#pragma once
+
+/**
+ * \file Compression.h
+ * \brief File containing compress utilities
+ */
+
+#include <cstdint>
+#include <sp/common/DataBuffer.h>
+
+namespace sp {
+namespace zlib {
+
+/**
+ * \brief Compress some data
+ * \param buffer the data to compress
+ * \return the compressed data
+ */
+DataBuffer Compress(const DataBuffer& buffer);
+
+/**
+ * \brief Reads the packet lenght and uncompress it
+ * \param buffer the data to uncompress
+ * \return the uncompressed data
+ */
+DataBuffer Decompress(DataBuffer& buffer);
+
+/**
+ * \brief Uncompress some data
+ * \param buffer the data to uncompress
+ * \param packetLength lenght of data
+ * \return the uncompressed data
+ */
+DataBuffer Decompress(DataBuffer& buffer, std::uint64_t packetLength);
+
+}  // namespace zlib
+}  // namespace sp

include/sp/extensions/Extensions.h

@@ -0,0 +1,5 @@
+#pragma once
+
+#if __has_include(<sp/extensions/Compress.h>)
+	#include <sp/extensions/Compress.h>
+#endif

include/sp/protocol/MessageDispatcher.h

@@ -0,0 +1,54 @@
+#pragma once
+
+/**
+ * \file MessageDispatcher.h
+ * \brief File containing the sp::MessageDispatcher class
+ */
+
+#include <map>
+
+namespace sp {
+
+/**
+ * \class MessageDispatcher
+ * \brief Class used to dispatch messages
+ */
+template <typename MessageIdType, typename MessageBase, typename MessageHandler>
+class MessageDispatcher {
+  private:
+	std::map<MessageIdType, std::vector<std::shared_ptr<MessageHandler>>> m_Handlers;
+
+  public:
+	/**
+	 * \brief Constructor
+	 */
+	MessageDispatcher() {}
+
+	/**
+	 * \brief Dispatch a packet
+	 * \param packet The packet to dispatch
+	 */
+	void Dispatch(const MessageBase& a_Message);
+
+	/**
+	 * \brief Register a packet handler
+	 * \param type The packet type
+	 * \param handler The packet handler
+	 */
+	void RegisterHandler(MessageIdType a_MessageType, const std::shared_ptr<MessageHandler>& a_Handler);
+	/**
+	 * \brief Unregister a packet handler
+	 * \param type The packet type
+	 * \param handler The packet handler
+	 */
+	void UnregisterHandler(MessageIdType a_MessageType, const std::shared_ptr<MessageHandler>& a_Handler);
+	/**
+	 * \brief Unregister a packet handler
+	 * \param handler The packet handler
+	 */
+	void UnregisterHandler(const std::shared_ptr<MessageHandler>& a_Handler);
+};
+
+#include <sp/protocol/message/MessageDispatcherImpl.inl>
+
+}  // namespace blitz

include/sp/protocol/MessageFactory.h

@@ -7,42 +7,7 @@
 
 namespace sp {
 
-namespace details {
-
-template <typename TBase>
-using ArrayType = std::vector<std::function<std::unique_ptr<TBase>(void)>>;
-
-
-
-template <typename TBase, typename... TMessages>
-struct ArrayFiller {};
-
-template <typename TBase, typename... TMessages>
-struct ArrayFiller<TBase, std::tuple<TMessages...>> {
-	static ArrayType<TBase> ArrayCreate() {
-		ArrayType<TBase> array;
-		array.reserve(sizeof...(TMessages));
-		ArrayFiller<TBase, TMessages...>::ArrayAppend(array);
-		return array;
-	}
-};
-
-template <typename TBase, typename TMessage, typename... TMessages>
-struct ArrayFiller<TBase, TMessage, TMessages...> {
-	static void ArrayAppend(details::ArrayType<TBase>& array) {
-		ArrayFiller<TBase, TMessage>::ArrayAppend(array);
-		ArrayFiller<TBase, TMessages...>::ArrayAppend(array);
-	}
-};
-
-template <typename TBase, typename TMessage>
-struct ArrayFiller<TBase, TMessage> {
-	static void ArrayAppend(details::ArrayType<TBase>& array) {
-		array.push_back([]() -> std::unique_ptr<TBase> { return std::make_unique<TMessage>(); });
-	}
-};
-
-}  // namespace details
+#include <sp/protocol/message/ArrayFillerImpl.inl>
 
 template <typename TBase, typename TTMessages>
 class MessageFactory {

include/sp/protocol/message/ArrayFillerImpl.inl

@@ -0,0 +1,38 @@
+#pragma once
+
+namespace details {
+
+template <typename TBase>
+using ArrayType = std::vector<std::function<std::unique_ptr<TBase>(void)>>;
+
+
+
+template <typename TBase, typename... TMessages>
+struct ArrayFiller {};
+
+template <typename TBase, typename... TMessages>
+struct ArrayFiller<TBase, std::tuple<TMessages...>> {
+	static ArrayType<TBase> ArrayCreate() {
+		ArrayType<TBase> array;
+		array.reserve(sizeof...(TMessages));
+		ArrayFiller<TBase, TMessages...>::ArrayAppend(array);
+		return array;
+	}
+};
+
+template <typename TBase, typename TMessage, typename... TMessages>
+struct ArrayFiller<TBase, TMessage, TMessages...> {
+	static void ArrayAppend(details::ArrayType<TBase>& array) {
+		ArrayFiller<TBase, TMessage>::ArrayAppend(array);
+		ArrayFiller<TBase, TMessages...>::ArrayAppend(array);
+	}
+};
+
+template <typename TBase, typename TMessage>
+struct ArrayFiller<TBase, TMessage> {
+	static void ArrayAppend(details::ArrayType<TBase>& array) {
+		array.push_back([]() -> std::unique_ptr<TBase> { return std::make_unique<TMessage>(); });
+	}
+};
+
+}  // namespace details

include/sp/protocol/message/MessageDispatcherImpl.inl

@@ -0,0 +1,34 @@
+#pragma once
+
+template <typename MessageIdType, typename MessageBase, typename MessageHandler>
+void MessageDispatcher<MessageIdType, MessageBase, MessageHandler>::RegisterHandler(MessageIdType a_MessageType, const std::shared_ptr<MessageHandler>& a_Handler) {
+	auto found = std::find(m_Handlers[a_MessageType].begin(), m_Handlers[a_MessageType].end(), a_Handler);
+	if (found == m_Handlers[a_MessageType].end())
+		m_Handlers[a_MessageType].push_back(a_Handler);
+}
+
+template <typename MessageIdType, typename MessageBase, typename MessageHandler>
+void MessageDispatcher<MessageIdType, MessageBase, MessageHandler>::UnregisterHandler(MessageIdType a_MessageType, const std::shared_ptr<MessageHandler>& a_Handler) {
+	auto found = std::find(m_Handlers[a_MessageType].begin(), m_Handlers[a_MessageType].end(), a_Handler);
+	if (found != m_Handlers[a_MessageType].end())
+		m_Handlers[a_MessageType].erase(found);
+}
+
+template <typename MessageIdType, typename MessageBase, typename MessageHandler>
+void MessageDispatcher<MessageIdType, MessageBase, MessageHandler>::UnregisterHandler(const std::shared_ptr<MessageHandler>& a_Handler) {
+	for (auto& pair : m_Handlers) {
+		if (pair.second.empty())
+			continue;
+
+		MessageIdType type = pair.first;
+
+		m_Handlers[type].erase(std::remove(m_Handlers[type].begin(), m_Handlers[type].end(), a_Handler), m_Handlers[type].end());
+	}
+}
+
+template <typename MessageIdType, typename MessageBase, typename MessageHandler>
+void MessageDispatcher<MessageIdType, MessageBase, MessageHandler>::Dispatch(const MessageBase& a_Message) {
+	MessageIdType type = a_Message.GetId();
+	for (auto& handler : m_Handlers[type])
+		a_Message.Dispatch(*handler);
+}

include/sp/protocol/message/MessageInterfacesImpl.h

@@ -30,7 +30,7 @@ class MessageInterfaceBigEndian : public TBase {
 	}
 
 	template <typename T>
-	void WriteData(T value, DataBuffer& buffer) {
+	void WriteData(T value, DataBuffer& buffer) const {
 		ToNetwork(value);
 		buffer << value;
 	}
@@ -71,12 +71,12 @@ class MessageInterfaceReadBase : public TBase {
 template <typename TBase>
 class MessageInterfaceWriteBase : public TBase {
   public:
-	void Write(DataBuffer& buffer) {
+	void Write(DataBuffer& buffer) const {
 		WriteImpl(buffer);
 	}
 
   protected:
-	virtual void WriteImpl(DataBuffer& buffer) = 0;
+	virtual void WriteImpl(DataBuffer& buffer) const = 0;
 };
 
 // Handler functionality chunk
@@ -85,12 +85,12 @@ class MessageInterfaceHandlerBase : public TBase {
   public:
 	using HandlerType = typename THandler::HandlerT;
 
-	void Dispatch(HandlerType& handler) {
+	void Dispatch(HandlerType& handler) const {
 		DispatchImpl(handler);
 	}
 
   protected:
-	virtual void DispatchImpl(HandlerType& handler) = 0;
+	virtual void DispatchImpl(HandlerType& handler) const = 0;
 };
 
 // Validity functionality chunk
@@ -109,7 +109,7 @@ class MessageInterfaceValidityBase : public TBase {
 template <typename TBase>
 class MessageInterfaceWriteIdBase : public TBase {
   public:
-	void Write(DataBuffer& buffer) {
+	void Write(DataBuffer& buffer) const {
 		this->WriteData(this->GetId(), buffer);
 		this->WriteImpl(buffer);
 	}

include/sp/protocol/message/MessagesImpl.h

@@ -26,8 +26,8 @@ class MessageImplDispatchBase : public TBase {
 	using Handler = typename TBase::HandlerType;
 
   protected:
-	virtual void DispatchImpl(Handler& handler) override {
-		handler.Handle(static_cast<TActual&>(*this));
+	virtual void DispatchImpl(Handler& handler) const override {
+		handler.Handle(static_cast<const TActual&>(*this));
 	}
 };
 
@@ -113,13 +113,13 @@ class MessageImplFieldsWriteBase : public TBase {
   private:
 	// normal writing
 	template <typename TField>
-	void WriteField(Field<TField, 0>& field, DataBuffer& buffer) {
+	void WriteField(const Field<TField, 0>& field, DataBuffer& buffer) const {
 		this->WriteData(field.GetValue(), buffer);
 	}
 
 	// writing field in bitfield
 	template <typename TFieldType, typename TField, int IAlignment>
-	void WriteField(Field<TField, IAlignment>& field, TFieldType& data, std::size_t offset) {
+	void WriteField(const Field<TField, IAlignment>& field, TFieldType& data, std::size_t offset) const {
 		static constexpr std::size_t TotalBitCount = sizeof(TFieldType) * 8;
 		// we suppose that the first element is at the highest bits
 		data |= (field.GetValue() & ((1 << IAlignment) - 1)) << TotalBitCount - IAlignment - offset;
@@ -127,7 +127,7 @@ class MessageImplFieldsWriteBase : public TBase {
 
 	// writing bitfield
 	template <typename TContainer, typename TFirst, typename... TFields>
-	void WriteField(Field<BitField<TContainer, TFirst, TFields...>, 0>& field, DataBuffer& buffer) {
+	void WriteField(const Field<BitField<TContainer, TFirst, TFields...>, 0>& field, DataBuffer& buffer) const {
 		TContainer data = 0;
 		std::size_t offset = 0;
 		TupleForEach(
@@ -139,9 +139,9 @@ class MessageImplFieldsWriteBase : public TBase {
 		this->WriteData(data, buffer);
 	}
 
-	void WriteImpl(DataBuffer& buffer) override {
+	void WriteImpl(DataBuffer& buffer) const override {
 		auto& allFields = this->GetFields();
-		TupleForEach([&buffer, this](auto& field) { this->WriteField(field, buffer); }, allFields);
+		TupleForEach([&buffer, this](const auto& field) { this->WriteField(field, buffer); }, allFields);
 	}
 };
 

src/sp/common/ByteSwapping.cpp

@@ -0,0 +1,74 @@
+#include <sp/common/ByteSwapping.h>
+
+#ifdef _WIN32
+#include <winsock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+
+#include <algorithm>
+
+namespace sp {
+
+template <typename T>
+void SwapBytes(T& value) {
+	char* ptr = reinterpret_cast<char*>(&value);
+	std::reverse(ptr, ptr + sizeof(T));
+}
+
+bool IsSystemBigEndian() {
+	static constexpr std::uint16_t test = 10;
+	static const bool isBigEndian = reinterpret_cast<const std::uint8_t*>(&test)[1] == 10;
+	return isBigEndian;
+}
+
+template <>
+void ToNetwork<std::uint16_t>(std::uint16_t& value) {
+	value = htons(value);
+}
+
+template <>
+void ToNetwork<std::uint32_t>(std::uint32_t& value) {
+	value = htonl(value);
+}
+
+template <>
+void ToNetwork<std::uint64_t>(std::uint64_t& value) {
+	if (IsSystemBigEndian())
+		return;
+	SwapBytes(value);
+}
+
+template <>
+void FromNetwork<std::uint16_t>(std::uint16_t& value) {
+	value = ntohs(value);
+}
+
+template <>
+void FromNetwork<std::uint32_t>(std::uint32_t& value) {
+	value = ntohl(value);
+}
+
+template <>
+void FromNetwork<std::uint64_t>(std::uint64_t& value) {
+	if (IsSystemBigEndian())
+		return;
+	SwapBytes(value);
+}
+
+template <>
+void TrySwapBytes<std::uint16_t>(std::uint16_t& value) {
+	SwapBytes(value);
+}
+
+template <>
+void TrySwapBytes<std::uint32_t>(std::uint32_t& value) {
+	SwapBytes(value);
+}
+
+template <>
+void TrySwapBytes<std::uint64_t>(std::uint64_t& value) {
+	SwapBytes(value);
+}
+
+}  // namespace sp

src/sp/extensions/Compress.cpp

@@ -0,0 +1,86 @@
+#include <sp/extensions/Compress.h>
+
+#include <cassert>
+#include <sp/common/VarInt.h>
+#include <zlib.h>
+
+#define COMPRESSION_THRESHOLD 64
+
+namespace sp {
+namespace zlib {
+
+static DataBuffer Inflate(const std::uint8_t* source, std::size_t size, std::size_t uncompressedSize) {
+	DataBuffer result;
+	result.Resize(uncompressedSize);
+
+	uncompress(reinterpret_cast<Bytef*>(result.data()), reinterpret_cast<uLongf*>(&uncompressedSize),
+		reinterpret_cast<const Bytef*>(source), static_cast<uLong>(size));
+
+	assert(result.GetSize() == uncompressedSize);
+	return result;
+}
+
+static DataBuffer Deflate(const std::uint8_t* source, std::size_t size) {
+	DataBuffer result;
+	uLongf compressedSize = size;
+
+	result.Resize(size);  // Resize for the compressed data to fit into
+	compress(
+		reinterpret_cast<Bytef*>(result.data()), &compressedSize, reinterpret_cast<const Bytef*>(source), static_cast<uLong>(size));
+	result.Resize(compressedSize);	// Resize to cut useless data
+
+	return result;
+}
+
+DataBuffer Compress(const DataBuffer& buffer) {
+	DataBuffer packet;
+
+	if (buffer.GetSize() < COMPRESSION_THRESHOLD) {
+		// Don't compress since it's a small packet
+		VarInt compressedDataLength = 0;
+		std::uint64_t packetLength = compressedDataLength.GetSerializedLength() + buffer.GetSize();
+
+		packet << packetLength;
+		packet << compressedDataLength;
+		packet << buffer;
+		return packet;
+	}
+
+	DataBuffer compressedData = Deflate(buffer.data(), buffer.GetSize());
+
+	VarInt uncompressedDataLength = buffer.GetSize();
+	std::uint64_t packetLength = uncompressedDataLength.GetSerializedLength() + compressedData.GetSize();
+
+	packet << packetLength;
+	packet << uncompressedDataLength;
+	packet.WriteSome(compressedData.data(), compressedData.GetSize());
+	return packet;
+}
+
+DataBuffer Decompress(DataBuffer& buffer, std::uint64_t packetLength) {
+	VarInt uncompressedLength;
+	buffer >> uncompressedLength;
+
+	std::uint64_t compressedLength = packetLength - uncompressedLength.GetSerializedLength();
+
+	if (uncompressedLength.GetValue() == 0) {
+		// Data already uncompressed. Nothing to do
+		DataBuffer ret;
+		buffer.ReadSome(ret, compressedLength);
+		return ret;
+	}
+
+	assert(buffer.GetReadOffset() + compressedLength <= buffer.GetSize());
+
+	return Inflate(buffer.data() + buffer.GetReadOffset(), compressedLength, uncompressedLength.GetValue());
+}
+
+DataBuffer Decompress(DataBuffer& buffer) {
+	std::uint64_t packetLength;
+	buffer >> packetLength;
+
+	return Decompress(buffer, packetLength);
+}
+
+}  // namespace zlib
+}  // namespace sp

test/test_packets.cpp

@@ -3,6 +3,9 @@
 #include <examples/PacketExample.h>
 #include <memory>
 
+#include <sp/extensions/Extensions.h>
+#include <sp/default/DefaultPacketDispatcher.h>
+
 class KeepAliveHandler : public sp::PacketHandler {
 	void Handle(const KeepAlivePacket& packet) {
 		std::cout << "KeepAlive handled !\n";
@@ -22,8 +25,8 @@ int main() {
 
 	sp::PacketMessage* msg = upgradeTower.get();
 
-	KeepAliveHandler handler;
-	msg->Dispatch(handler);
+	auto handler = std::make_shared<KeepAliveHandler>();
+	msg->Dispatch(*handler);
 
 	sp::DataBuffer buffer;
 	msg->Write(buffer);
@@ -43,7 +46,13 @@ int main() {
 		return 1;
 	}
 	std::cout << (unsigned)packet->GetId() << std::endl;
-	packet->Dispatch(handler);
+	packet->Dispatch(*handler);
+
+	sp::PacketDispatcher dispatcher;
+	dispatcher.RegisterHandler(PacketId::KeepAlive, handler);
+	dispatcher.Dispatch(*packet);
+	dispatcher.UnregisterHandler(PacketId::KeepAlive, handler);
+	dispatcher.UnregisterHandler(handler);
 
 	return 0;
 }

xmake.lua

@@ -2,11 +2,54 @@ add_rules("mode.debug", "mode.release")
 
 set_languages("c++17")
 
+local modules = {
+    Compression = {
+        Option = "zlib",
+        Deps = {"zlib"},
+        Packages = {"zlib"},
+        Includes = {"include/(sp/extensions/Compress.h)"},
+        Sources = {"src/sp/extensions/Compress.cpp"}
+    }
+}
+
+-- Map modules to options
+for name, module in table.orderpairs(modules) do
+	if module.Option then
+		option(module.Option, { description = "Enables the " .. name .. " module", default = true, category = "Modules" })
+    end
+end
+
+-- Add modules requirements
+for name, module in table.orderpairs(modules) do
+	if module.Deps then
+        add_requires(module.Deps)
+    end
+end
+
+-- Add modules targets
+for name, module in table.orderpairs(modules) do
+	if module.Deps and has_config(module.Option) then
+        target("SimpleProtocolLib-" .. name)
+            add_includedirs("include")
+            for _, include in table.orderpairs(module.Includes) do
+                add_headerfiles(include)
+            end
+            for _, source in table.orderpairs(module.Sources) do
+                add_files(source)
+            end
+            for _, package in table.orderpairs(module.Packages) do
+                add_packages(package)
+            end
+            set_group("Library")
+            set_kind("$(kind)")
+    end
+end
+
 target("SimpleProtocolLib")
     add_includedirs("include")
-    add_headerfiles("include/(sp/**.h)")
+    add_headerfiles("include/(sp/common/**.h)", "include/(sp/common/**.h)", "include/(sp/common/**.h)")
     set_group("Library")
-    add_files("src/sp/**.cpp")
+    add_files("src/sp/common/*.cpp")
     set_kind("$(kind)")
 
 -- Tests