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diff --git a/nxcomp/OpcodeStore.h b/nxcomp/OpcodeStore.h
new file mode 100755
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+/**************************************************************************/
+/*                                                                        */
+/* Copyright (c) 2001, 2007 NoMachine, http://www.nomachine.com/.         */
+/*                                                                        */
+/* NXCOMP, NX protocol compression and NX extensions to this software     */
+/* are copyright of NoMachine. Redistribution and use of the present      */
+/* software is allowed according to terms specified in the file LICENSE   */
+/* which comes in the source distribution.                                */
+/*                                                                        */
+/* Check http://www.nomachine.com/licensing.html for applicability.       */
+/*                                                                        */
+/* NX and NoMachine are trademarks of NoMachine S.r.l.                    */
+/*                                                                        */
+/* All rights reserved.                                                   */
+/*                                                                        */
+/**************************************************************************/
+
+#ifndef OpcodeStore_H
+#define OpcodeStore_H
+
+#include "NXproto.h"
+
+class OpcodeStore
+{
+  public:
+
+  OpcodeStore();
+
+  ~OpcodeStore();
+
+  //
+  // Map NX protocol messages. At the moment mapping is hard-
+  // coded. Opcodes should be instead agreed with the proxied
+  // X server (by excluding all opcodes used for extensions)
+  // and exported by the proxy class to channels.
+  //
+  // Some toolkits query the server only once for extensions'
+  // opcodes and share the same settings across all channels.
+  // This could be a problem as channels needed to monitor the
+  // traffic to find out the extensions' opcodes themselves,
+  // so it is important that proxy passes an instance of this
+  // class to new channels.
+  //
+
+  unsigned char getControlParameters;
+  unsigned char getCleanupParameters;
+  unsigned char getImageParameters;
+  unsigned char getUnpackParameters;
+  unsigned char getShmemParameters;
+  unsigned char getFontParameters;
+
+  unsigned char startSplit;
+  unsigned char endSplit;
+  unsigned char commitSplit;
+  unsigned char finishSplit;
+  unsigned char abortSplit;
+
+  unsigned char splitData;
+  unsigned char splitEvent;
+
+  unsigned char setCacheParameters;
+  unsigned char setExposeParameters;
+
+  unsigned char setUnpackGeometry;
+  unsigned char setUnpackColormap;
+  unsigned char setUnpackAlpha;
+
+  unsigned char putPackedImage;
+
+  unsigned char freeUnpack;
+  unsigned char freeSplit;
+
+  unsigned char shapeExtension;
+  unsigned char renderExtension;
+
+  unsigned char noSplitNotify;
+  unsigned char startSplitNotify;
+  unsigned char commitSplitNotify;
+  unsigned char endSplitNotify;
+  unsigned char emptySplitNotify;
+};
+
+#endif /* OpcodeStore_H */