Start implementing network connectivity.

Change-Id: I82875bfd1c3a086033d22de636d4fb43455ebac3

src/tcpsockets/TCPStream.h

@@ -0,0 +1,72 @@
+/*
+   TCPStream.h
+
+   TCPStream class interface. TCPStream provides methods to trasnfer
+   data between peers over a TCP/IP connection.
+
+   ------------------------------------------
+
+   Copyright © 2013 [Vic Hargrave - http://vichargrave.com]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+#ifndef TCPSOCKETS_TCPSTREAM_H_
+#define TCPSOCKETS_TCPSTREAM_H_
+
+#include <cstddef>
+#include <string>
+
+#ifdef _WIN32
+#include <winsock2.h>
+#else
+#include <sys/socket.h>
+#endif
+
+#include "llvm/StringRef.h"
+
+class TCPStream {
+  int m_sd;
+  std::string m_peerIP;
+  int m_peerPort;
+
+ public:
+  friend class TCPAcceptor;
+  friend class TCPConnector;
+
+  ~TCPStream();
+
+  enum Error {
+    kConnectionClosed = 0,
+    kConnectionReset = -1,
+    kConnectionTimedOut = -2
+  };
+
+  std::size_t send(const char* buffer, std::size_t len, Error* err);
+  std::size_t receive(char* buffer, std::size_t len, Error* err,
+                      int timeout = 0);
+  void close();
+
+  llvm::StringRef getPeerIP() const { return m_peerIP; }
+  int getPeerPort() const { return m_peerPort; }
+
+  TCPStream(const TCPStream& stream) = delete;
+  TCPStream& operator=(const TCPStream&) = delete;
+ private:
+  bool WaitForReadEvent(int timeout);
+
+  TCPStream(int sd, struct sockaddr_in* address);
+  TCPStream() = delete;
+};
+
+#endif