diff --git a/common/rdr/Exception.h b/common/rdr/Exception.h
new file mode 100644
index 0000000..1b92f77
--- /dev/null
+++ b/common/rdr/Exception.h
@@ -0,0 +1,58 @@
+/* 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.
+ */
+
+#ifndef __RDR_EXCEPTION_H__
+#define __RDR_EXCEPTION_H__
+
+#include <stdio.h>
+#include <string.h>
+
+namespace rdr {
+
+  struct Exception {
+    enum { len = 256 };
+    char str_[len];
+    Exception(const char* s=0) {
+      str_[0] = 0;
+      if (s)
+        strncat(str_, s, len-1);
+      else
+        strcat(str_, "Exception");
+    }
+    virtual const char* str() const { return str_; }
+  };
+
+  struct SystemException : public Exception {
+    int err;
+    SystemException(const char* s, int err_);
+  }; 
+
+  struct TimedOut : public Exception {
+    TimedOut(const char* s="Timed out") : Exception(s) {}
+  };
+ 
+  struct EndOfStream : public Exception {
+    EndOfStream(const char* s="End of stream") : Exception(s) {}
+  };
+
+  struct FrameException : public Exception {
+    FrameException(const char* s="Frame exception") : Exception(s) {}
+  };
+}
+
+#endif