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      1 /*
      2  * libjingle
      3  * Copyright 2004--2010, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_BASE_ASYNCTCPSOCKET_H_
     29 #define TALK_BASE_ASYNCTCPSOCKET_H_
     30 
     31 #include "talk/base/asyncpacketsocket.h"
     32 #include "talk/base/scoped_ptr.h"
     33 #include "talk/base/socketfactory.h"
     34 
     35 namespace talk_base {
     36 
     37 // Simulates UDP semantics over TCP.  Send and Recv packet sizes
     38 // are preserved, and drops packets silently on Send, rather than
     39 // buffer them in user space.
     40 class AsyncTCPSocket : public AsyncPacketSocket {
     41  public:
     42   static AsyncTCPSocket* Create(SocketFactory* factory, bool listen);
     43   explicit AsyncTCPSocket(AsyncSocket* socket, bool listen);
     44   virtual ~AsyncTCPSocket();
     45 
     46   virtual SocketAddress GetLocalAddress(bool* allocated) const;
     47   virtual SocketAddress GetRemoteAddress() const;
     48   virtual int Send(const void *pv, size_t cb);
     49   virtual int SendTo(const void *pv, size_t cb, const SocketAddress& addr);
     50   virtual int Close();
     51 
     52   virtual Socket::ConnState GetState() const;
     53   virtual int GetOption(Socket::Option opt, int* value);
     54   virtual int SetOption(Socket::Option opt, int value);
     55   virtual int GetError() const;
     56   virtual void SetError(int error);
     57 
     58  protected:
     59   int SendRaw(const void* pv, size_t cb);
     60   virtual void ProcessInput(char* data, size_t& len);
     61 
     62  private:
     63   int Flush();
     64 
     65   // Called by the underlying socket
     66   void OnConnectEvent(AsyncSocket* socket);
     67   void OnReadEvent(AsyncSocket* socket);
     68   void OnWriteEvent(AsyncSocket* socket);
     69   void OnCloseEvent(AsyncSocket* socket, int error);
     70 
     71   scoped_ptr<AsyncSocket> socket_;
     72   bool listen_;
     73   char* inbuf_, * outbuf_;
     74   size_t insize_, inpos_, outsize_, outpos_;
     75 
     76   DISALLOW_EVIL_CONSTRUCTORS(AsyncTCPSocket);
     77 };
     78 
     79 }  // namespace talk_base
     80 
     81 #endif  // TALK_BASE_ASYNCTCPSOCKET_H_
     82