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{*****************************************************************************
written by
   Yunhong Gu, last updated 12/02/2007
translated by
   Zhengcheng Zhang, last updated 10/10/2008
*****************************************************************************}

Unit udt;

Interface

{$INCLUDE mcompile.inc}

 Uses
  SysUtils, Classes,
  {$IFDEF DELPHI}
  Windows, Winsock, JwaWinsock2, JwaWS2tcpip,
  {$ENDIF}
  {$IFDEF KYLIX}
  Libc,
  {$ENDIF}
  StrUtils
  ;

 Const
  ERROR = -1;
  INVALID_SOCK = -1;
  {$IFDEF DELPHI}
  UDTLIB = 'udt.dll';
  {$ENDIF}
  {$IFDEF KYLIX}
  UDTLIB = 'libudt.so';
  {$ENDIF}

 Type
  {$IFDEF KYLIX}
  pAddrInfo = pAddressInfo;
  {$ENDIF}
  UDTSOCKET = Integer;
  pInteger = ^Integer;
  pUDTSOCKET = ^UDTSOCKET;
  
  UDTOpt = (
   UDT_MSS,             // the Maximum Transfer Unit
   UDT_SNDSYN,          // if sending is blocking
   UDT_RCVSYN,          // if receiving is blocking
   UDT_CC,              // custom congestion control algorithm
   UDT_FC,		          // Flight flag size (window size)
   UDT_SNDBUF,          // maximum buffer in sending queue
   UDT_RCVBUF,          // UDT receiving buffer size
   UDT_LINGER,          // waiting for unsent data when closing
   UDP_SNDBUF,          // UDP sending buffer size
   UDP_RCVBUF,          // UDP receiving buffer size
   UDT_MAXMSG,          // maximum datagram message size
   UDT_MSGTTL,          // time-to-live of a datagram message
   UDT_RENDEZVOUS,      // rendezvous connection mode
   UDT_SNDTIMEO,        // send() timeout
   UDT_RCVTIMEO,        // recv() timeout
   UDT_REUSEADDR	      // reuse an existing port or create a new one
  );

  CPerfMon = Record
   // global measurements
   msTimeStamp: Int64;                 // time since the UDT entity is started, in milliseconds
   pktSentTotal: Int64;                // total number of sent data packets, including retransmissions
   pktRecvTotal: Int64;                // total number of received packets
   pktSndLossTotal: Integer;           // total number of lost packets (sender side)
   pktRcvLossTotal: Integer;           // total number of lost packets (receiver side)
   pktRetransTotal: Integer;           // total number of retransmitted packets
   pktSentACKTotal: Integer;           // total number of sent ACK packets
   pktRecvACKTotal: Integer;           // total number of received ACK packets
   pktSentNAKTotal: Integer;           // total number of sent NAK packets
   pktRecvNAKTotal: Integer;           // total number of received NAK packets

   // local measurements
   pktSent: Int64;                     // number of sent data packets, including retransmissions
   pktRecv: Int64;                     // number of received packets
   pktSndLoss: Integer;                      // number of lost packets (sender side)
   pktRcvLoss: Integer;                      // number of lost packets (receiverer side)
   pktRetrans: Integer;                      // number of retransmitted packets
   pktSentACK: Integer;                      // number of sent ACK packets
   pktRecvACK: Integer;                      // number of received ACK packets
   pktSentNAK: Integer;                      // number of sent NAK packets
   pktRecvNAK: Integer;                      // number of received NAK packets
   mbpsSendRate: Double;                 // sending rate in Mb/s
   mbpsRecvRate: Double;                 // receiving rate in Mb/s

   // instant measurements
   usPktSndPeriod: Double;               // packet sending period, in microseconds
   pktFlowWindow: Integer;                   // flow window size, in number of packets
   pktCongestionWindow: Integer;             // congestion window size, in number of packets
   pktFlightSize: Integer;                   // number of packets on flight
   msRTT: Double;                        // RTT, in milliseconds
   mbpsBandwidth: Double;                // estimated bandwidth, in Mb/s
   byteAvailSndBuf: Integer;                 // available UDT sender buffer size
   byteAvailRcvBuf: Integer;                 // available UDT receiver buffer size
  End;

  timeval = Record
   tv_sec: LongInt;
   tv_usec: LongInt;
  End;

 SOCKOPT = UDTOpt;
 TRACEINFO = CPerfMon;
 pTRACEINFO = ^TRACEINFO;
 pTimeVal = ^TimeVal;
 pUDSET = Pointer;

Function socket(af, type_, protocol: Integer): UDTSOCKET; Cdecl; External UDTLIB Name 'udt_socket';
Function bind(u: UDTSOCKET; Const name: pSockAddr; namelen: Integer): Integer; Cdecl; External UDTLIB Name 'udt_bind';
Function listen(u: UDTSOCKET; backlog: Integer): Integer; Cdecl; External UDTLIB Name 'udt_listen';
Function accept(u: UDTSOCKET; addr: pSockAddr; addrlen: pInteger): UDTSOCKET; Cdecl; External UDTLIB Name 'udt_accept';
Function connect(u: UDTSOCKET; Const name: pSockAddr; namelen: Integer): Integer; Cdecl; External UDTLIB Name 'udt_connect';
Function close(u: UDTSOCKET): Integer; Cdecl; External UDTLIB Name 'udt_close';
Function getpeername(u: UDTSOCKET; name: pSockAddr; namelen: pInteger): Integer; Cdecl; External UDTLIB Name 'udt_getpeername';
Function getsockname(u: UDTSOCKET; name: pSockAddr; namelen: pInteger): Integer; Cdecl; External UDTLIB Name 'udt_getsockname';
Function getsockopt(u: UDTSOCKET; level: Integer; optname: SOCKOPT; optval: Pointer; optlen: pInteger): Integer; Cdecl; External UDTLIB Name 'udt_getsockopt';
Function setsockopt(u: UDTSOCKET; level: Integer; optname: SOCKOPT; Const optval: Pointer; optlen: Integer): Integer; Cdecl; External UDTLIB Name 'udt_setsockopt';
Function send(u: UDTSOCKET; Const buf: pChar; len, flags: Integer): Integer; Cdecl; External UDTLIB Name 'udt_send';
Function recv(u: UDTSOCKET; buf: pChar; len, flags: Integer): Integer; Cdecl; External UDTLIB Name 'udt_recv';
Function sendmsg(u: UDTSOCKET; Const buf: pChar; len: Integer; ttl: Integer = -1; inorder: Boolean = false): Integer; Cdecl; External UDTLIB Name 'udt_sendmsg';
Function recvmsg(u: UDTSOCKET; buf: pChar; len: Integer): Integer; Cdecl; External UDTLIB Name 'udt_recvmsg';
Function perfmon(u: UDTSOCKET; perf: pTRACEINFO; clear: Boolean = True): Integer; Cdecl; External UDTLIB Name 'udt_perfmon';
Function getlasterror: pChar; Cdecl; External UDTLIB Name 'udt_getlasterror';
Function select(nfds: Integer; readfds, writefds, exceptfds: pUDSET; Const timeout: pTimeVal): Integer; Cdecl; External UDTLIB Name 'udt_select';
Function write_set(u: pUDTSOCKET; uslen: Integer): pUDSET; Cdecl; External UDTLIB;
Procedure read_set(u: pUDSET; us: pUDTSOCKET; uslen: pInteger); Cdecl; External UDTLIB;Procedure free_set(u: pUDSET); Cdecl; External UDTLIB;

Implementation

End.