Added the packet class from bakanet and renamed it for general use

src/bakatools/data_struct/data_stream.h

@@ -0,0 +1,58 @@
+#pragma once
+
+namespace Bk::Net {
+	class DataStream 
+	{
+	public:
+		DataStream() = default;
+		DataStream(std::vector<char> data)
+		: payload(data) {}
+
+		int size() { return payload.size(); }
+
+		template <typename T>
+		void push(const T& data)
+		{
+			static_assert(std::is_standard_layout<T>::value, "Data is too complex to be pushed into vector");
+			size_t i = payload.size();
+			payload.resize(i + sizeof(T));
+			std::memcpy(payload.data() + i, &data, sizeof(T));
+		}
+
+		template <typename T>
+		void push(const T* data, int size)
+		{
+			for(int i = 0; i < size; i++) push<T>(data[i]);	
+		}
+
+		template <typename T>
+		T pull()
+		{
+			static_assert(std::is_standard_layout<T>::value, "Data is too complex to be pulled from vector");
+			T data;
+			size_t i = payload.size() - sizeof(T);
+			std::memcpy(&data, payload.data() + i, sizeof(T));
+			payload.resize(i);
+			return data;
+		}
+
+		template <typename T>
+		std::unique_ptr<T[]> pull(int size)
+		{
+			std::unique_ptr<T[]> data(new T[size]);
+			for(int i = size - 1; i >= 0; i--) data[i] = pull<T>();
+			return data;
+		}
+
+		bool append_data(std::vector<char> data)
+		{
+			if (!data.size()) return false;
+			size_t i = payload.size();
+			payload.resize(i + data.size());
+			std::memcpy(payload.data() + i, data.data(), sizeof(char) * data.size());
+			return true;
+		}
+	
+		std::vector<char> payload;
+	};
+}