GenericRequest.h

/**************************************************************************/
/*                                                                        */
/* Copyright (c) 2001, 2010 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 Medialogic S.p.A.                   */
/*                                                                        */
/* All rights reserved.                                                   */
/*                                                                        */
/**************************************************************************/

#ifndef GenericRequest_H
#define GenericRequest_H

#include "Message.h"

//
// Set the verbosity level.
//

#define PANIC
#define WARNING
#undef  TEST
#undef  DEBUG
#undef  DUMP

//
// Set default values.
//

#define GENERICREQUEST_ENABLE_CACHE                      1
#define GENERICREQUEST_ENABLE_DATA                       1
#define GENERICREQUEST_ENABLE_SPLIT                      0
#define GENERICREQUEST_ENABLE_COMPRESS                   1

#define GENERICREQUEST_DATA_LIMIT                        262144 - 20
#define GENERICREQUEST_DATA_OFFSET                       20

#define GENERICREQUEST_CACHE_SLOTS                       400
#define GENERICREQUEST_CACHE_THRESHOLD                   5
#define GENERICREQUEST_CACHE_LOWER_THRESHOLD             1

#define GENERICREQUEST_ENABLE_COMPRESS_IF_PROTO_STEP_7   0

//
// The message class.
//

class GenericRequestMessage : public Message
{
  friend class GenericRequestStore;

  public:

  GenericRequestMessage()
  {
  }

  ~GenericRequestMessage()
  {
  }

  //
  // Note that we consider for this message a data offset
  // of 4 (or 20 starting from protocol 3). Bytes from 9
  // to 20, if present, are taken as part of identity and
  // encoded through an array of int caches.
  //

  private:

  unsigned char  opcode;
  unsigned short data[8];
};

class GenericRequestStore : public MessageStore
{
  public:

  GenericRequestStore(StaticCompressor *compressor);

  virtual ~GenericRequestStore();

  virtual const char *name() const
  {
    return "GenericRequest";
  }

  virtual unsigned char opcode() const
  {
    return X_NXInternalGenericRequest;
  }

  virtual unsigned int storage() const
  {
    return sizeof(GenericRequestMessage);
  }

  //
  // Message handling methods.
  //

  public:

  virtual Message *create() const
  {
    return new GenericRequestMessage();
  }

  virtual Message *create(const Message &message) const
  {
    return new GenericRequestMessage((const GenericRequestMessage &) message);
  }

  virtual void destroy(Message *message) const
  {
    delete (GenericRequestMessage *) message;
  }

  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;
};

#endif /* GenericRequest_H */