diff --git a/common/rdr/HexOutStream.cxx b/common/rdr/HexOutStream.cxx
new file mode 100644
index 0000000..9b0b6c4
--- /dev/null
+++ b/common/rdr/HexOutStream.cxx
@@ -0,0 +1,110 @@
+/* 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 <rdr/HexOutStream.h>
+#include <rdr/Exception.h>
+
+using namespace rdr;
+
+const int DEFAULT_BUF_LEN = 16384;
+
+static inline int min(int a, int b) {return a<b ? a : b;}
+
+HexOutStream::HexOutStream(OutStream& os, int buflen)
+: out_stream(os), offset(0), bufSize(buflen ? buflen : DEFAULT_BUF_LEN)
+{
+  if (bufSize % 2)
+    bufSize--;
+  ptr = start = new U8[bufSize];
+  end = start + bufSize;
+}
+
+HexOutStream::~HexOutStream() {
+  delete [] start;
+}
+
+
+char HexOutStream::intToHex(int i) {
+  if ((i>=0) && (i<=9))
+    return '0'+i;
+  else if ((i>=10) && (i<=15))
+    return 'a'+(i-10);
+  else
+    throw rdr::Exception("intToHex failed");
+}
+
+char* HexOutStream::binToHexStr(const char* data, int length) {
+  char* buffer = new char[length*2+1];
+  for (int i=0; i<length; i++) {
+    buffer[i*2] = intToHex((data[i] >> 4) & 15);
+    buffer[i*2+1] = intToHex((data[i] & 15));
+    if (!buffer[i*2] || !buffer[i*2+1]) {
+      delete [] buffer;
+      return 0;
+    }
+  }
+  buffer[length*2] = 0;
+  return buffer;
+}
+
+
+void
+HexOutStream::writeBuffer() {
+  U8* pos = start;
+  while (pos != ptr) {
+    out_stream.check(2);
+    U8* optr = out_stream.getptr();
+    U8* oend = out_stream.getend();
+    int length = min(ptr-pos, (oend-optr)/2);
+
+    for (int i=0; i<length; i++) {
+      optr[i*2] = intToHex((pos[i] >> 4) & 0xf);
+      optr[i*2+1] = intToHex(pos[i] & 0xf);
+    }
+
+    out_stream.setptr(optr + length*2);
+    pos += length;
+  }
+  offset += ptr - start;
+  ptr = start;
+}
+
+int HexOutStream::length()
+{
+  return offset + ptr - start;
+}
+
+void
+HexOutStream::flush() {
+  writeBuffer();
+  out_stream.flush();
+}
+
+int
+HexOutStream::overrun(int itemSize, int nItems) {
+  if (itemSize > bufSize)
+    throw Exception("HexOutStream overrun: max itemSize exceeded");
+
+  writeBuffer();
+
+  if (itemSize * nItems > end - ptr)
+    nItems = (end - ptr) / itemSize;
+
+  return nItems;
+}
+