netinterface.hh

流媒体传输协议的实现代码,非常有用.可以支持rtsp mms等流媒体传输协议

/**********
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)

This library 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 Lesser General Public License for
more details.

You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
**********/
// "mTunnel" multicast access service
// Copyright (c) 1996-2001 Live Networks, Inc.  All rights reserved.
// Network Interfaces
// C++ header

#ifndef _NET_INTERFACE_HH
#define _NET_INTERFACE_HH

#ifndef _NET_ADDRESS_HH
#include "NetAddress.hh"
#endif

class NetInterface {
public:
  virtual ~NetInterface();
  
  static UsageEnvironment* DefaultUsageEnvironment;
      // if non-NULL, used for each new interfaces
  
protected:
  NetInterface(); // virtual base class
};

class DirectedNetInterface: public NetInterface {
public:
  virtual ~DirectedNetInterface();
  
  virtual Boolean write(unsigned char* data, unsigned numBytes) = 0;
  
  virtual Boolean SourceAddrOKForRelaying(UsageEnvironment& env,
					  unsigned addr) = 0;
  
protected:
  DirectedNetInterface(); // virtual base class
};

class DirectedNetInterfaceSet {
public:
  DirectedNetInterfaceSet();
  virtual ~DirectedNetInterfaceSet();
  
  DirectedNetInterface* Add(DirectedNetInterface const* interf);
      // Returns the old value if different, otherwise 0
  Boolean Remove(DirectedNetInterface const* interf);
  
  Boolean IsEmpty() { return fTable->IsEmpty(); }
  
  // Used to iterate through the interfaces in the set
  class Iterator {
  public:
    Iterator(DirectedNetInterfaceSet& interfaces);
    virtual ~Iterator();
    
    DirectedNetInterface* next(); // NULL iff none
    
  private:
    HashTable::Iterator* fIter;
  };
  
private:
  friend class Iterator;
  HashTable* fTable;
};

class Socket: public NetInterface {
public:
  virtual ~Socket();
  
  virtual Boolean handleRead(unsigned char* buffer, unsigned bufferMaxSize,
			     unsigned& bytesRead,
			     struct sockaddr_in& fromAddress) = 0;
      // Returns False on error; resultData == NULL if data ignored
  
  int socketNum() const { return fSocketNum; }
  
  Port port() const {
    return fPort;
  }
  
  UsageEnvironment& env() const { return fEnv; }
  
  static int DebugLevel;
  
protected:
  Socket(UsageEnvironment& env, Port port,
	 Boolean setLoopback = True); // virtual base class
  
private:
  int fSocketNum;
  UsageEnvironment& fEnv;
  Port fPort;
};

UsageEnvironment& operator<<(UsageEnvironment& s, const Socket& sock);

// A data structure for looking up a Socket by port:

class SocketLookupTable {
public:
  virtual ~SocketLookupTable();
  
  Socket* Fetch(UsageEnvironment& env, Port port, Boolean& isNew);
  // Creates a new Socket if none already exists
  Boolean Remove(Socket const* sock);
  
protected:
  SocketLookupTable(); // abstract base class
  virtual Socket* CreateNew(UsageEnvironment& env, Port port) = 0;
  
private:
  HashTable* fTable;
};

// A data structure for counting traffic:

class NetInterfaceTrafficStats {
public:
  NetInterfaceTrafficStats();
  
  void countPacket(unsigned packetSize);
  
  float totNumPackets() const {return fTotNumPackets;}
  float totNumBytes() const {return fTotNumBytes;}
  
  Boolean haveSeenTraffic() const;
  
private:
  float fTotNumPackets;
  float fTotNumBytes;
};

#endif