New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/platform/socket.hpp

@@ -0,0 +1,41 @@
+#pragma once
+
+#include <cstdint>
+#include <memory>
+#include <string>
+
+namespace platform
+{
+class Socket
+{
+public:
+  virtual ~Socket() = default;
+
+  // Open/Close contract:
+  // 1. You can call Open+Close pair multiple times for the same Socket instance.
+  // 2. There are should be Close call after each Open call.
+  // 3. Open+Open: second Open does nothing and returns false.
+  // 4. Close+Close: second Close does nothing.
+  virtual bool Open(std::string const & host, uint16_t port) = 0;
+  virtual void Close() = 0;
+
+  // Read is blocking, it waits for the 'count' data size.
+  virtual bool Read(uint8_t * data, uint32_t count) = 0;
+  virtual bool Write(uint8_t const * data, uint32_t count) = 0;
+
+  virtual void SetTimeout(uint32_t milliseconds) = 0;
+};
+
+class StubSocket final : public Socket
+{
+public:
+  // Socket overrides:
+  bool Open(std::string const &, uint16_t) override { return false; }
+  void Close() override {}
+  bool Read(uint8_t *, uint32_t) override { return false; }
+  bool Write(uint8_t const *, uint32_t) override { return false; }
+  void SetTimeout(uint32_t) override {}
+};
+
+std::unique_ptr<Socket> CreateSocket();
+}  // namespace platform