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diff --git a/src/stlplus/portability/tcp_sockets.cpp b/src/stlplus/portability/tcp_sockets.cpp
new file mode 100644
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--- /dev/null
+++ b/src/stlplus/portability/tcp_sockets.cpp
@@ -0,0 +1,119 @@
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+////////////////////////////////////////////////////////////////////////////////
+
+#include "tcp_sockets.hpp"
+
+////////////////////////////////////////////////////////////////////////////////
+
+namespace stlplus
+{
+
+  //////////////////////////////////////////////////////////////////////////////
+  // TCP Connection
+
+
+  TCP_connection::TCP_connection(const IP_socket& socket) : IP_socket(socket)
+  {
+  }
+
+  TCP_connection::TCP_connection(void) : IP_socket(TCP)
+  {
+  }
+
+  unsigned short TCP_connection::port(void) const
+  {
+    return remote_port();
+  }
+
+  ////////////////////////////////////////////////////////////////////////////////
+  // Server
+
+  TCP_server::TCP_server(void) : IP_socket(TCP)
+  {
+  }
+
+  TCP_server::TCP_server(unsigned short port, unsigned short queue) : IP_socket(TCP)
+  {
+    initialise(port,queue);
+  }
+
+  bool TCP_server::initialise(unsigned short port, unsigned short queue)
+  {
+    if (!IP_socket::bind_any(port)) return false;
+    return IP_socket::listen(queue);
+  }
+
+  TCP_connection TCP_server::accept(void)
+  {
+    return TCP_connection(IP_socket::accept());
+  }
+
+  bool TCP_server::connection_ready(unsigned timeout)
+  {
+    return accept_ready(timeout);
+  }
+
+  TCP_connection TCP_server::connection(void)
+  {
+    return accept();
+  }
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Client
+
+  TCP_client::TCP_client(void) : IP_socket(TCP)
+  {
+  }
+
+  TCP_client::TCP_client(const std::string& address, unsigned short port, unsigned int timeout) : IP_socket(TCP)
+  {
+    initialise(address,port,timeout);
+  }
+
+  TCP_client::TCP_client(unsigned long address, unsigned short port, unsigned int timeout) : IP_socket(TCP)
+  {
+    initialise(address,port,timeout);
+  }
+
+  bool TCP_client::initialise(unsigned long remote_address, unsigned short remote_port, unsigned int timeout)
+  {
+    if (!IP_socket::connect(remote_address, remote_port))
+    {
+      close();
+      return false;
+    }
+    if (timeout && !IP_socket::connected(timeout))
+    {
+      close();
+      return false;
+    }
+    return true;
+  }
+
+  bool TCP_client::initialise(const std::string& address, unsigned short remote_port, unsigned int timeout)
+  {
+    // lookup the address and convert it into an IP number
+    unsigned long remote_address = IP_socket::ip_lookup(address);
+    if (!remote_address) return false;
+    return initialise(remote_address, remote_port, timeout);
+  }
+
+  unsigned short TCP_client::port(void) const
+  {
+    return remote_port();
+  }
+
+  unsigned long TCP_client::address(void) const
+  {
+    return remote_address();
+  }
+
+  ////////////////////////////////////////////////////////////////////////////////
+
+} // end namespace stlplus