mirror of
https://github.com/ptitSeb/Serious-Engine
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196 lines
7.2 KiB
C++
196 lines
7.2 KiB
C++
/* Copyright (c) 2002-2012 Croteam Ltd.
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This program is free software; you can redistribute it and/or modify
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it under the terms of version 2 of the GNU General Public License as published by
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the Free Software Foundation
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */
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#ifndef SE_INCL_PACKET_H
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#define SE_INCL_PACKET_H
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#ifdef PRAGMA_ONCE
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#pragma once
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#endif
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#include <Engine/Base/Lists.h>
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#include <Engine/Base/Timer.h>
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// The total size of the UDP packet should be below 1450 bytes, to reduce the
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// packet drop rate caused by routers dropping large UDP packets. UDP_BLOCK_SIZE is the
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// maximum length of real data, not counting the packet header (ulPacketSequence, bReliable,uwID)
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#define MAX_UDP_BLOCK_SIZE 1400
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#define MAX_HEADER_SIZE (sizeof(UBYTE) + sizeof(ULONG) + sizeof(UWORD) + sizeof(ULONG)) // pa_bReliable + pa_ulPacketSequence + pa_uwID + pa_ulTransferSize
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#define MAX_PACKET_SIZE (MAX_UDP_BLOCK_SIZE + MAX_HEADER_SIZE)
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// flags for different kinds of packets used by the netcode - note that the acknowledge packets are unreliable
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#define UDP_PACKET_UNRELIABLE 0
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#define UDP_PACKET_RELIABLE 1
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#define UDP_PACKET_RELIABLE_HEAD 2
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#define UDP_PACKET_RELIABLE_TAIL 4
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#define UDP_PACKET_ACKNOWLEDGE 8
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#define UDP_PACKET_CONNECT_REQUEST 16
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#define UDP_PACKET_CONNECT_RESPONSE 32
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// constants for CPacket::CanRetry() function - they describe the retry state of the packet
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#define RS_NOW 0 // the packet should be resent immediately
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#define RS_NOTNOW 1 // the packet should be resent at a later time
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#define RS_NOTATALL 2 // the packet has reached the maximum number of retries - give up
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class CAddress {
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public:
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ULONG adr_ulAddress; // host address
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UWORD adr_uwPort; // host port
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UWORD adr_uwID; // host id
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void MakeBroadcast(void);
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void Clear(void) {
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adr_ulAddress = 0;
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adr_uwPort = 0;
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adr_uwID = 0;
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}
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};
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/*
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* A class that contains a single UDP packet.
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*/
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class CPacket {
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public:
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ULONG pa_ulSequence; // Sequence number of this packet
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UBYTE pa_ubReliable; // Is packet reliable or not
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SLONG pa_slSize; // Number of data bytes in packet (without header)
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SLONG pa_slTransferSize; // Number of data bytes in a data transfer unit this packet belongs to
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UBYTE pa_ubRetryNumber; // How many retries so far for this packet
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CTimerValue pa_tvSendWhen; // When to try sending this packet (includes latency bandwidth limitations
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// as well as retry intervals)
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UBYTE pa_pubPacketData[MAX_PACKET_SIZE]; // Packet header + actual data contained in the packet
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CListNode pa_lnListNode; // used to create a linked list of packets - buffer
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CAddress pa_adrAddress; // packet address, port and client ID
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// Constructors/destructors
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CPacket() { Clear(); } // Default Constructor
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CPacket(CPacket &paOriginal); // Copy constructor
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~CPacket() { Clear(); }
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// Reset all packet data and free allocated memory
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void Clear();
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// Write data to the packet and add header data
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BOOL WriteToPacket(void* pv,SLONG slSize,UBYTE ubReliable,ULONG ulSequence,UWORD uwClientID,SLONG slTransferSize);
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// Write raw data to the packet and extract header data from the data
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BOOL WriteToPacketRaw(void* pv,SLONG slSize);
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// Read data from the packet (no header data)
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BOOL ReadFromPacket(void* pv,SLONG &slExpectedSize);
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// Is packet reliable
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BOOL IsReliable();
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// Is packet a head of a reliable stream?
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BOOL IsReliableHead();
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// Is packet a tail of a reliable stream?
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BOOL IsReliableTail();
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// Is the packet from a broadcast address (pa_uwID not assigned)
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BOOL IsBroadcast();
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// Get the sequence number of the packet (must be reliable)
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ULONG GetSequence();
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// What is the current retry status?
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UBYTE CanRetry();
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// Drop the packet from the list
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void Drop();
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// get the size of data transfer unit this packet belongs to
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SLONG CPacket::GetTransferSize();
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// Copy operator
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void operator=(const CPacket &paOriginal);
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};
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// data used to limit bandwidth/lantency and calculate statistics in packet-buffers
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class CPacketBufferStats {
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public:
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FLOAT pbs_fLatencyLimit; // minimum latency in seconds
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FLOAT pbs_fLatencyVariation;// additional latency variation
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FLOAT pbs_fBandwidthLimit; // maximum bandwidth in bps (bits per second)
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CTimerValue pbs_tvTimeNextPacketStart; // next point in time free for data receiving
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void Clear(void);
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// get time when the packet will be allowed to leave the buffer
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CTimerValue GetPacketSendTime(SLONG slSize);
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};
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class CPacketBuffer {
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public:
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ULONG pb_ulTotalSize; // Total size of data in packets stored in this buffer (no headers)
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ULONG pb_ulLastSequenceOut; // Sequence number of the last packet taken out of the buffer
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CListHead pb_lhPacketStorage;
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ULONG pb_ulNumOfPackets; // Total number of packets currently in storage
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ULONG pb_ulNumOfReliablePackets; // Number of reliable packets in storage (0 if no reliable stream in progress)
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CPacketBufferStats *pb_ppbsStats; // for bandwidth/latency emulation stats and limits
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CPacketBufferStats pb_pbsLimits; // maximum output BPS for the buffer, to prevent client flooding
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CPacketBuffer() { Clear(); };
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~CPacketBuffer() { Clear(); };
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// Empty the packet buffer
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void Clear();
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// Is the packet buffer empty?
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BOOL IsEmpty();
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// Calculate when the packet can be output from the buffer
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CTimerValue GetPacketSendTime(SLONG slSize);
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// Adds a packet to the end of the packet buffer
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BOOL AppendPacket(CPacket &paPacket,BOOL bDelay);
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// Inserts the packet in the buffer, according to it's sequence number
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BOOL InsertPacket(CPacket &paPacket,BOOL bDelay);
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// Bumps up the retry count and time, and appends the packet to the buffer
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BOOL Retry(CPacket &paPacket);
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// Reads the data from the first packet in the bufffer, but does not remove it
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CPacket* PeekFirstPacket();
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// Reads the first packet in the bufffer
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CPacket* GetFirstPacket();
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// Reads the data from the packet with the requested sequence, but does not remove it
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CPacket* PeekPacket(ULONG ulSequence);
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// Reads the packet with the requested sequence
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CPacket* GetPacket(ULONG ulSequence);
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// Reads the first connection request packet from the buffer
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CPacket* GetConnectRequestPacket();
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// Removes the first packet from the buffer
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BOOL RemoveFirstPacket(BOOL bDelete);
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// Removes the packet with the requested sequence from the buffer
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BOOL RemovePacket(ULONG ulSequence,BOOL bDelete);
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// Remove connect response packets from the buffer
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BOOL RemoveConnectResponsePackets();
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// Gets the sequence number of the first packet in the buffer
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ULONG GetFirstSequence();
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// Gets the sequence number of the last packet in the buffer
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ULONG GetLastSequence();
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// Is the packet with the given sequence in the buffer?
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BOOL IsSequenceInBuffer(ULONG ulSequence);
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// Check if the buffer contains a complete sequence of reliable packets at the start of the buffer
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BOOL CheckSequence(SLONG &slSize);
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};
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#endif /* include-once check. */
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