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diff --git a/nxcomp/RenderExtension.h b/nxcomp/RenderExtension.h
new file mode 100755
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+++ b/nxcomp/RenderExtension.h
@@ -0,0 +1,504 @@
+/**************************************************************************/
+/*                                                                        */
+/* 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 RenderExtension_H
+#define RenderExtension_H
+
+#include "Message.h"
+
+//
+// Set the verbosity level.
+//
+
+#define PANIC
+#define WARNING
+#undef  TEST
+#undef  DEBUG
+#undef  DUMP
+
+//
+// Compression of data part is not enabled as
+// most messages of this type are smaller than
+// the current data size compression threshold.
+//
+
+#define RENDEREXTENSION_ENABLE_CACHE               1
+#define RENDEREXTENSION_ENABLE_DATA                0
+#define RENDEREXTENSION_ENABLE_SPLIT               0
+#define RENDEREXTENSION_ENABLE_COMPRESS            0
+
+#define RENDEREXTENSION_DATA_LIMIT                 6144
+#define RENDEREXTENSION_DATA_OFFSET                36
+
+#define RENDEREXTENSION_CACHE_SLOTS                6000
+#define RENDEREXTENSION_CACHE_THRESHOLD            20
+#define RENDEREXTENSION_CACHE_LOWER_THRESHOLD      10
+
+#define RENDEREXTENSION_CACHE_SLOTS_IF_PROTO_STEP_7    8000
+
+//
+// Used to build the table of minor opcodes.
+//
+
+#define RENDEREXTENSION_MINOR_OPCODE_LIMIT         256
+
+//
+// The message class.
+//
+
+class RenderMinorExtensionStore;
+
+class RenderExtensionMessage : public Message
+{
+  friend class RenderExtensionStore;
+  friend class RenderMinorExtensionStore;
+
+  friend class RenderGenericRequestStore;
+  friend class RenderCreatePictureStore;
+  friend class RenderChangePictureStore;
+  friend class RenderFreePictureStore;
+  friend class RenderPictureClipStore;
+  friend class RenderPictureTransformStore;
+  friend class RenderPictureFilterStore;
+  friend class RenderCreateGlyphSetStore;
+  friend class RenderFreeGlyphSetStore;
+  friend class RenderAddGlyphsStore;
+  friend class RenderCompositeStore;
+  friend class RenderCompositeGlyphsStore;
+  friend class RenderFillRectanglesStore;
+  friend class RenderTrapezoidsStore;
+  friend class RenderTrianglesStore;
+
+  friend class RenderCreatePictureCompatStore;
+  friend class RenderFreePictureCompatStore;
+  friend class RenderPictureClipCompatStore;
+  friend class RenderCreateGlyphSetCompatStore;
+  friend class RenderCompositeCompatStore;
+  friend class RenderCompositeGlyphsCompatStore;
+
+  public:
+
+  RenderExtensionMessage()
+  {
+  }
+
+  ~RenderExtensionMessage()
+  {
+  }
+
+  //
+  // We consider for this message a data offset of 36,
+  // that is size of the biggest among all requests of
+  // this extension. The most common requests have a
+  // specific differential encoding, others are simply
+  // encoded through an array of int or char caches.
+  //
+
+  private:
+
+  union
+  {
+    struct
+    {
+      unsigned char type;
+
+      unsigned char  char_data[32];
+      unsigned short short_data[16];
+      unsigned short long_data[8];
+    }
+    any;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned int src_id;
+      unsigned int dst_id;
+
+      unsigned int format;
+      unsigned int mask;
+    }
+    create_picture;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned int src_id;
+    }
+    change_picture;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned int src_id;
+    }
+    free_picture;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned int src_id;
+
+      unsigned short src_x;
+      unsigned short src_y;
+    }
+    picture_clip;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned int src_id;
+    }
+    picture_transform;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned int src_id;
+      unsigned int num_elm;
+    }
+    picture_filter;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned int set_id;
+      unsigned int format;
+    }
+    create_set;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned int set_id;
+    }
+    free_set;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned int set_id;
+      unsigned int num_elm;
+    }
+    add_glyphs;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned char op;
+
+      unsigned int src_id;
+      unsigned int msk_id;
+      unsigned int dst_id;
+
+      unsigned short src_x;
+      unsigned short src_y;
+
+      unsigned short msk_x;
+      unsigned short msk_y;
+
+      unsigned short dst_x;
+      unsigned short dst_y;
+
+      unsigned short width;
+      unsigned short height;
+    }
+    composite;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned char op;
+
+      unsigned char num_elm;
+
+      unsigned int src_id;
+      unsigned int dst_id;
+
+      unsigned int format;
+      unsigned int set_id;
+
+      unsigned short src_x;
+      unsigned short src_y;
+
+      unsigned short offset_x;
+      unsigned short offset_y;
+    }
+    composite_glyphs;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned char op;
+
+      unsigned int dst_id;
+    }
+    fill_rectangles;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned char op;
+
+      unsigned int src_id;
+      unsigned int dst_id;
+
+      unsigned int format;
+
+      unsigned short src_x;
+      unsigned short src_y;
+    }
+    trapezoids;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned char op;
+
+      unsigned int src_id;
+      unsigned int dst_id;
+
+      unsigned int format;
+
+      unsigned short src_x;
+      unsigned short src_y;
+    }
+    triangles;
+
+    struct
+    {
+      unsigned char type;
+
+      unsigned char op;
+
+      unsigned char num_elm;
+
+      unsigned int src_id;
+      unsigned int dst_id;
+
+      unsigned int format;
+      unsigned int set_id;
+
+      unsigned short src_x;
+      unsigned short src_y;
+
+      unsigned short delta_x;
+      unsigned short delta_y;
+    }
+    composite_glyphs_compat;
+
+  }
+  data;
+};
+
+class RenderExtensionStore : public MessageStore
+{
+  public:
+
+  RenderExtensionStore(StaticCompressor *compressor);
+
+  virtual ~RenderExtensionStore();
+
+  virtual const char *name() const
+  {
+    return "RenderExtension";
+  }
+
+  virtual unsigned char opcode() const
+  {
+    return opcode_;
+  }
+
+  virtual unsigned int storage() const
+  {
+    return sizeof(RenderExtensionMessage);
+  }
+
+  //
+  // Message handling methods.
+  //
+
+  public:
+
+  virtual Message *create() const
+  {
+    return new RenderExtensionMessage();
+  }
+
+  virtual Message *create(const Message &message) const
+  {
+    return new RenderExtensionMessage((const RenderExtensionMessage &) message);
+  }
+
+  virtual void destroy(Message *message) const
+  {
+    delete (RenderExtensionMessage *) message;
+  }
+
+  //
+  // Determine if the message must be stored
+  // in the cache.
+  //
+
+  virtual int validateMessage(const unsigned char *buffer, int size);
+
+  //
+  // Since protocol step 5 these methods are
+  // specialized in their minor opcode stores.
+  //
+
+  virtual int identitySize(const unsigned char *buffer, unsigned int size);
+
+  virtual int encodeIdentity(EncodeBuffer &encodeBuffer, const unsigned char *buffer,
+                                 const unsigned int size, int bigEndian,
+                                     ChannelCache *channelCache) const;
+
+  virtual int decodeIdentity(DecodeBuffer &decodeBuffer, unsigned char *&buffer,
+                                 unsigned int &size, int bigEndian, WriteBuffer *writeBuffer,
+                                     ChannelCache *channelCache) const;
+
+  virtual int parseIdentity(Message *message, const unsigned char *buffer,
+                                unsigned int size, int bigEndian) const;
+
+  virtual int unparseIdentity(const Message *message, unsigned char *buffer,
+                                  unsigned int size, int bigEndian) const;
+
+  virtual void updateIdentity(EncodeBuffer &encodeBuffer, const Message *message,
+                                  const Message *cachedMessage,
+                                      ChannelCache *channelCache) const;
+
+  virtual void updateIdentity(DecodeBuffer &decodeBuffer, const Message *message,
+                                  ChannelCache *channelCache) const;
+
+  virtual void identityChecksum(const Message *message, const unsigned char *buffer,
+                                    unsigned int size, int bigEndian) const;
+
+  virtual void dumpIdentity(const Message *message) const;
+
+  private:
+
+  unsigned char opcode_;
+
+  //
+  // Keep pointers to specialized classes.
+  //
+
+  RenderMinorExtensionStore *minors_[RENDEREXTENSION_MINOR_OPCODE_LIMIT];
+
+  RenderMinorExtensionStore *generic_;
+};
+
+class RenderMinorExtensionStore : public MinorMessageStore
+{
+  public:
+
+  virtual const char *name() const = 0;
+
+  virtual int identitySize(const unsigned char *buffer, unsigned int size) = 0;
+
+  virtual int encodeMessage(EncodeBuffer &encodeBuffer, const unsigned char *buffer,
+                                const unsigned int size, int bigEndian,
+                                    ChannelCache *channelCache) const = 0;
+
+  virtual int decodeMessage(DecodeBuffer &decodeBuffer, unsigned char *&buffer,
+                                unsigned int &size, unsigned char type, int bigEndian,
+                                    WriteBuffer *writeBuffer, ChannelCache *channelCache) const = 0;
+
+  virtual int parseIdentity(Message *message, const unsigned char *buffer,
+                                unsigned int size, int bigEndian) const = 0;
+
+  virtual int unparseIdentity(const Message *message, unsigned char *buffer,
+                                  unsigned int size, int bigEndian) const = 0;
+
+  virtual void updateIdentity(EncodeBuffer &encodeBuffer, const Message *message,
+                                  const Message *cachedMessage,
+                                      ChannelCache *channelCache) const = 0;
+
+  virtual void updateIdentity(DecodeBuffer &decodeBuffer, const Message *message,
+                                  ChannelCache *channelCache) const = 0;
+
+  virtual void identityChecksum(const Message *message, const unsigned char *buffer,
+                                    unsigned int size, md5_state_t *md5_state,
+                                        int bigEndian) const = 0;
+
+  //
+  // Internal encode and decode utilities.
+  //
+
+  protected:
+
+  void encodeLongData(EncodeBuffer &encodeBuffer, const unsigned char *buffer,
+                          unsigned int offset, unsigned int size, int bigEndian,
+                              ChannelCache *channelCache) const;
+ 
+  void encodeIntData(EncodeBuffer &encodeBuffer, const unsigned char *buffer,
+                         unsigned int offset, unsigned int size, int bigEndian,
+                             ChannelCache *channelCache) const;
+ 
+  void encodeCharData(EncodeBuffer &encodeBuffer, const unsigned char *buffer,
+                          unsigned int offset, unsigned int size, int bigEndian,
+                              ChannelCache *channelCache) const;
+
+  void decodeLongData(DecodeBuffer &decodeBuffer, unsigned char *buffer,
+                          unsigned int offset, unsigned int size, int bigEndian,
+                              ChannelCache *channelCache) const;
+
+  void decodeIntData(DecodeBuffer &decodeBuffer, unsigned char *buffer,
+                         unsigned int offset, unsigned int size, int bigEndian,
+                             ChannelCache *channelCache) const;
+
+  void decodeCharData(DecodeBuffer &decodeBuffer, unsigned char *buffer,
+                          unsigned int offset, unsigned int size, int bigEndian,
+                              ChannelCache *channelCache) const;
+
+  /*
+   * The following methods are only used in the
+   * encoding of the generic render request. To
+   * be removed in future.
+   */
+
+  void parseIntData(const Message *message, const unsigned char *buffer,
+                        unsigned int offset, unsigned int size,
+                            int bigEndian) const;
+
+  void unparseIntData(const Message *message, unsigned char *buffer,
+                          unsigned int offset, unsigned int size,
+                              int bigEndian) const;
+
+  void updateIntData(EncodeBuffer &encodeBuffer, const Message *message,
+                         const Message *cachedMessage, unsigned int offset,
+                             unsigned int size, ChannelCache *channelCache) const;
+
+  void updateIntData(DecodeBuffer &decodeBuffer, const Message *message,
+                         unsigned int offset, unsigned int size,
+                             ChannelCache *channelCache) const;
+};
+
+#endif /* RenderExtension_H */