www.pudn.com > UDP-based_Reliable_Data_Transfer_Library.zip > channel.h
/*****************************************************************************
Copyright © 2001 - 2006, The Board of Trustees of the University of Illinois.
All Rights Reserved.
UDP-based Data Transfer Library (UDT) version 3
Laboratory for Advanced Computing (LAC)
National Center for Data Mining (NCDM)
University of Illinois at Chicago
http://www.lac.uic.edu/
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.
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.
*****************************************************************************/
/*****************************************************************************
This header file contains the definition of the UDP channel.
*****************************************************************************/
/*****************************************************************************
written by
Yunhong Gu [gu@lac.uic.edu], last updated 02/14/2006
*****************************************************************************/
#ifndef __UDT_CHANNEL_H__
#define __UDT_CHANNEL_H__
#include "udt.h"
#include "packet.h"
class CChannel
{
public:
CChannel();
CChannel(const __int32& version);
~CChannel();
// Functionality:
// Opne a UDP channel.
// Parameters:
// 0) [in] addr: The local address that UDP will use.
// Returned value:
// None.
void open(const sockaddr* addr = NULL);
// Functionality:
// Send data through the channel.
// Parameters:
// 0) [in] buffer: pointer to the data to be sent.
// 1) [in] size: size of the buffer.
// Returned value:
// Actual size of data sent.
__int32 send(char* buffer, const __int32& size) const;
// Functionality:
// Receive data from the channel.
// Parameters:
// 0) [out] buffer: received data.
// 1) [in] size: size of the expected data received.
// Returned value:
// Actual size of data received.
__int32 recv(char* buffer, const __int32& size) const;
// Functionality:
// Read the data from the channel but the data is not removed from UDP buffer.
// Parameters:
// 0) [out] buffer: previewed received data.
// 1) [in] size: size of the expected data received.
// Returned value:
// Actual size of data received.
__int32 peek(char* buffer, const __int32& size) const;
// Functionality:
// Send a packet through the channel.
// Parameters:
// 0) [in] packet: reference to a CPacket entity.
// Returned value:
// The channel itself for serial output.
const CChannel& operator<<(CPacket& packet) const;
// Functionality:
// Receive a packet from the channel.
// Parameters:
// 0) [out] packet: reference to a CPacket entity.
// Returned value:
// The channel itself for serial input.
const CChannel& operator>>(CPacket& packet) const;
// Functionality:
// Send a packet to the given address.
// Parameters:
// 0) [in] packet: reference to a CPacket entity.
// 1) [in] addr: pointer to the destination address.
// Returned value:
// Actual size of data sent.
__int32 sendto(CPacket& packet, const sockaddr* addr) const;
// Functionality:
// Receive a packet from the channel and record the source address.
// Parameters:
// 0) [in] packet: reference to a CPacket entity.
// 1) [in] addr: pointer to the source address.
// Returned value:
// Actual size of data received.
__int32 recvfrom(CPacket& packet, sockaddr* addr) const;
// Functionality:
// Connect to the peer side whose address is in the sockaddr structure.
// Parameters:
// 0) [in] addr: pointer to the peer side address.
// Returned value:
// None.
void connect(const sockaddr* addr);
// Functionality:
// Disconnect and close the UDP entity.
// Parameters:
// None.
// Returned value:
// None.
void disconnect() const;
// Functionality:
// Get the UDP sending buffer size.
// Parameters:
// None.
// Returned value:
// Current UDP sending buffer size.
__int32 getSndBufSize();
// Functionality:
// Get the UDP receiving buffer size.
// Parameters:
// None.
// Returned value:
// Current UDP receiving buffer size.
__int32 getRcvBufSize();
// Functionality:
// Set the UDP sending buffer size.
// Parameters:
// 0) [in] size: expected UDP sending buffer size.
// Returned value:
// None.
void setSndBufSize(const __int32& size);
// Functionality:
// Set the UDP receiving buffer size.
// Parameters:
// 0) [in] size: expected UDP receiving buffer size.
// Returned value:
// None.
void setRcvBufSize(const __int32& size);
// Functionality:
// Query the socket address that the channel is using.
// Parameters:
// 0) [out] addr: pointer to store the returned socket address.
// Returned value:
// None.
void getSockAddr(sockaddr* addr) const;
// Functionality:
// Query the peer side socket address that the channel is connect to.
// Parameters:
// 0) [out] addr: pointer to store the returned socket address.
// Returned value:
// None.
void getPeerAddr(sockaddr* addr) const;
private:
__int32 m_iIPversion;
#ifndef WIN32
__int32 m_iSocket; // socket descriptor
#else
SOCKET m_iSocket;
#endif
__int32 m_iSndBufSize; // UDP sending buffer size
__int32 m_iRcvBufSize; // UDP receiving buffer size
char* m_pcChannelBuf; // buffer for temporally storage of in/out data
private:
void setChannelOpt();
};
#endif