diff --git a/common/rdr/FdOutStream.cxx b/common/rdr/FdOutStream.cxx
new file mode 100644
index 0000000..07ac04c
--- /dev/null
+++ b/common/rdr/FdOutStream.cxx
@@ -0,0 +1,159 @@
+/* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#ifdef _WIN32
+#include <winsock2.h>
+#define write(s,b,l) send(s,(const char*)b,l,0)
+#define EWOULDBLOCK WSAEWOULDBLOCK
+#undef errno
+#define errno WSAGetLastError()
+#undef EINTR
+#define EINTR WSAEINTR
+#else
+#include <sys/types.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/time.h>
+#endif
+
+// XXX Lynx/OS 2.3: protos for select(), bzero()
+#ifdef Lynx
+#include <sys/proto.h>
+#endif
+
+#include <rdr/FdOutStream.h>
+#include <rdr/Exception.h>
+
+
+using namespace rdr;
+
+enum { DEFAULT_BUF_SIZE = 16384 };
+
+FdOutStream::FdOutStream(int fd_, int timeoutms_, int bufSize_)
+  : fd(fd_), timeoutms(timeoutms_),
+    bufSize(bufSize_ ? bufSize_ : DEFAULT_BUF_SIZE), offset(0)
+{
+  ptr = start = new U8[bufSize];
+  end = start + bufSize;
+}
+
+FdOutStream::~FdOutStream()
+{
+  try {
+    flush();
+  } catch (Exception&) {
+  }
+  delete [] start;
+}
+
+void FdOutStream::setTimeout(int timeoutms_) {
+  timeoutms = timeoutms_;
+}
+
+int FdOutStream::length()
+{
+  return offset + ptr - start;
+}
+
+void FdOutStream::flush()
+{
+  U8* sentUpTo = start;
+  while (sentUpTo < ptr) {
+    int n = writeWithTimeout((const void*) sentUpTo, ptr - sentUpTo);
+    sentUpTo += n;
+    offset += n;
+  }
+
+  ptr = start;
+}
+
+
+int FdOutStream::overrun(int itemSize, int nItems)
+{
+  if (itemSize > bufSize)
+    throw Exception("FdOutStream overrun: max itemSize exceeded");
+
+  flush();
+
+  if (itemSize * nItems > end - ptr)
+    nItems = (end - ptr) / itemSize;
+
+  return nItems;
+}
+
+//
+// writeWithTimeout() writes up to the given length in bytes from the given
+// buffer to the file descriptor.  If there is a timeout set and that timeout
+// expires, it throws a TimedOut exception.  Otherwise it returns the number of
+// bytes written.  It never attempts to write() unless select() indicates that
+// the fd is writable - this means it can be used on an fd which has been set
+// non-blocking.  It also has to cope with the annoying possibility of both
+// select() and write() returning EINTR.
+//
+
+int FdOutStream::writeWithTimeout(const void* data, int length)
+{
+  int n;
+
+  do {
+
+    do {
+      fd_set fds;
+      struct timeval tv;
+      struct timeval* tvp = &tv;
+
+      if (timeoutms != -1) {
+        tv.tv_sec = timeoutms / 1000;
+        tv.tv_usec = (timeoutms % 1000) * 1000;
+      } else {
+        tvp = 0;
+      }
+
+      FD_ZERO(&fds);
+      FD_SET(fd, &fds);
+#ifdef _WIN32_WCE
+      // NB: This fixes a broken Winsock2 select() behaviour.  select()
+      // never returns for non-blocking sockets, unless they're already
+      // ready to be written to...
+      u_long zero = 0; ioctlsocket(fd, FIONBIO, &zero);
+#endif
+      n = select(fd+1, 0, &fds, 0, tvp);
+#ifdef _WIN32_WCE
+      u_long one = 0; ioctlsocket(fd, FIONBIO, &one);
+#endif
+    } while (n < 0 && errno == EINTR);
+
+    if (n < 0) throw SystemException("select",errno);
+
+    if (n == 0) throw TimedOut();
+
+    do {
+      n = ::write(fd, data, length);
+    } while (n < 0 && (errno == EINTR));
+      
+    // NB: This outer loop simply fixes a broken Winsock2 EWOULDBLOCK
+    // condition, found only under Win98 (first edition), with slow
+    // network connections.  Should in fact never ever happen...
+  } while (n < 0 && (errno == EWOULDBLOCK));
+
+  if (n < 0) throw SystemException("write",errno);
+
+  return n;
+}