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/* Starshatter: The Open Source Project
Copyright (c) 2021-2022, Starshatter: The Open Source Project Contributors
Copyright (c) 2011-2012, Starshatter OpenSource Distribution Contributors
Copyright (c) 1997-2006, Destroyer Studios LLC.
AUTHOR: John DiCamillo
OVERVIEW
========
Datagram (UDP) packet that implements the basic
packet-oriented network protocol.
*/
#ifndef NetGram_h
#define NetGram_h
#include <cstdint>
#include "NetAddr.h"
#include "Text.h"
const std::uint32_t NET_GRAM_ACK = 0x80000000;
const std::uint32_t NET_GRAM_RELIABLE = 0x40000000;
const std::uint32_t NET_GRAM_SEQ_MASK = 0x3fffffff;
const std::uint32_t NET_GRAM_HEADER_SIZE = 4;
const std::uint32_t NET_GRAM_MAX_SIZE = 1024;
class NetGram
{
public:
static const char* TYPENAME() { return "NetGram"; }
// for receiving packets from remote hosts:
NetGram(const NetAddr& src, Text msg);
// for composing packets to send to remote hosts:
NetGram(const NetAddr& dst, Text user_data, int retries);
int operator == (const NetGram& g) const { return packet_id == g.packet_id &&
addr == g.addr; }
int operator < (const NetGram& g) const { return Sequence() < g.Sequence(); }
std::uint32_t PacketID() const { return packet_id; }
std::uint32_t Sequence() const { return packet_id & NET_GRAM_SEQ_MASK; }
std::uint32_t SendTime() const { return send_time; }
std::uint8_t* Data() const { return (std::uint8_t*) body.data(); }
std::uint8_t* UserData() const { return (std::uint8_t*) body.data() + NET_GRAM_HEADER_SIZE; }
int Size() const { return body.length(); }
const Text& Body() const { return body; }
const NetAddr& Address() const { return addr; }
bool IsAck() const { return packet_id & NET_GRAM_ACK ? true : false; }
bool IsReliable() const { return packet_id & NET_GRAM_RELIABLE ? true : false; }
int Retries() const { return retries; }
void Retry();
NetGram Ack();
void ClearAck() { packet_id &= ~NET_GRAM_ACK; }
protected:
NetGram();
NetAddr addr; // network address of remote host
int retries; // number of retries remaining (reliable packets only)
std::uint32_t send_time; // time in msec of most recent send attempt
std::uint32_t packet_id; // copy of packet id from header in body
Text body; // header plus user data
};
#endif // NetGram_h
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