diff --git a/rfb/SMsgWriterV3.cxx b/rfb/SMsgWriterV3.cxx
new file mode 100644
index 0000000..20a7280
--- /dev/null
+++ b/rfb/SMsgWriterV3.cxx
@@ -0,0 +1,173 @@
+/* Copyright (C) 2002-2004 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 <rdr/OutStream.h>
+#include <rdr/MemOutStream.h>
+#include <rfb/msgTypes.h>
+#include <rfb/Exception.h>
+#include <rfb/ConnParams.h>
+#include <rfb/SMsgWriterV3.h>
+
+using namespace rfb;
+
+SMsgWriterV3::SMsgWriterV3(ConnParams* cp, rdr::OutStream* os)
+  : SMsgWriter(cp, os), updateOS(0), realOS(os), nRectsInUpdate(0),
+    nRectsInHeader(0), wsccb(0),
+    needSetDesktopSize(false)
+{
+}
+
+SMsgWriterV3::~SMsgWriterV3()
+{
+  delete updateOS;
+}
+
+void SMsgWriterV3::writeServerInit()
+{
+  os->writeU16(cp->width);
+  os->writeU16(cp->height);
+  cp->pf().write(os);
+  os->writeString(cp->name());
+  endMsg();
+}
+
+void SMsgWriterV3::startMsg(int type)
+{
+  if (os != realOS)
+    throw Exception("startMsg called while writing an update?");
+
+  os->writeU8(type);
+}
+
+void SMsgWriterV3::endMsg()
+{
+  os->flush();
+}
+
+bool SMsgWriterV3::writeSetDesktopSize() {
+  if (!cp->supportsDesktopResize) return false;
+  needSetDesktopSize = true;
+  return true;
+}
+
+void SMsgWriterV3::cursorChange(WriteSetCursorCallback* cb)
+{
+  wsccb = cb;
+}
+
+void SMsgWriterV3::writeSetCursor(int width, int height, int hotspotX,
+                                  int hotspotY, void* data, void* mask)
+{
+  if (!wsccb) return;
+  if (++nRectsInUpdate > nRectsInHeader && nRectsInHeader)
+    throw Exception("SMsgWriterV3::writeSetCursor: nRects out of sync");
+  os->writeS16(hotspotX);
+  os->writeS16(hotspotY);
+  os->writeU16(width);
+  os->writeU16(height);
+  os->writeU32(pseudoEncodingCursor);
+  os->writeBytes(data, width * height * (cp->pf().bpp/8));
+  os->writeBytes(mask, (width+7)/8 * height);
+}
+
+void SMsgWriterV3::writeFramebufferUpdateStart(int nRects)
+{
+  startMsg(msgTypeFramebufferUpdate);
+  os->pad(1);
+  if (wsccb) nRects++;
+  if (needSetDesktopSize) nRects++;
+  os->writeU16(nRects);
+  nRectsInUpdate = 0;
+  nRectsInHeader = nRects;
+  if (wsccb) {
+    wsccb->writeSetCursorCallback();
+    wsccb = 0;
+  }
+}
+
+void SMsgWriterV3::writeFramebufferUpdateStart()
+{
+  nRectsInUpdate = nRectsInHeader = 0;
+  if (!updateOS)
+    updateOS = new rdr::MemOutStream;
+  os = updateOS;
+}
+
+void SMsgWriterV3::writeFramebufferUpdateEnd()
+{
+  if (needSetDesktopSize) {
+    if (++nRectsInUpdate > nRectsInHeader && nRectsInHeader)
+      throw Exception("SMsgWriterV3 setDesktopSize: nRects out of sync");
+    os->writeS16(0);
+    os->writeS16(0);
+    os->writeU16(cp->width);
+    os->writeU16(cp->height);
+    os->writeU32(pseudoEncodingDesktopSize);
+    needSetDesktopSize = false;
+  }
+
+  if (nRectsInUpdate != nRectsInHeader && nRectsInHeader)
+    throw Exception("SMsgWriterV3::writeFramebufferUpdateEnd: "
+                    "nRects out of sync");
+  if (os == updateOS) {
+    os = realOS;
+    startMsg(msgTypeFramebufferUpdate);
+    os->pad(1);
+    os->writeU16(nRectsInUpdate);
+    os->writeBytes(updateOS->data(), updateOS->length());
+    updateOS->clear();
+  }
+
+  updatesSent++;
+  endMsg();
+}
+
+bool SMsgWriterV3::needFakeUpdate()
+{
+  return wsccb || needSetDesktopSize;
+}
+
+void SMsgWriterV3::startRect(const Rect& r, unsigned int encoding)
+{
+  if (++nRectsInUpdate > nRectsInHeader && nRectsInHeader)
+    throw Exception("SMsgWriterV3::startRect: nRects out of sync");
+
+  currentEncoding = encoding;
+  lenBeforeRect = os->length();
+  if (encoding != encodingCopyRect)
+    rawBytesEquivalent += 12 + r.width() * r.height() * (bpp()/8);
+
+  os->writeS16(r.tl.x);
+  os->writeS16(r.tl.y);
+  os->writeU16(r.width());
+  os->writeU16(r.height());
+  os->writeU32(encoding);
+}
+
+void SMsgWriterV3::endRect()
+{
+  if (currentEncoding <= encodingMax) {
+    bytesSent[currentEncoding] += os->length() - lenBeforeRect;
+    rectsSent[currentEncoding]++;
+  }
+}
+
+void SMsgWriterV3::setOutStream(rdr::OutStream* os_)
+{
+  SMsgWriter::setOutStream(os_);
+  realOS = os;
+}