PacketHeader.hpp

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#pragma once
 
#include <SDL3/SDL_stdinc.h>
 
#include <cstdint>
 
namespace net
{

inline constexpr uint16_t k_protocolMagic = 0x3247;

inline constexpr uint8_t k_protocolVersion = 1;

inline constexpr int k_maxPacketBytes = 1200;

enum class PacketKind : uint8_t
{
    Payload = 0,

    ConnectionRequest = 1,
    ConnectionAccepted = 2,
    Disconnect = 3,
    KeepAlive = 4,
};

enum class ChannelId : uint8_t
{
    Unreliable = 0,

    UnreliableSequenced = 1,

    ReliableOrdered = 2,

    ReliableUnordered = 3,
 
    Count = 4
};
 
#pragma pack(push, 1)
struct PacketHeader
{
    uint16_t magic;        
    uint8_t version;       
    uint8_t kind;          
    uint32_t connectionId; 
    uint16_t sequence;     
    uint8_t channel;       
    uint8_t flags;         
    uint16_t fragmentInfo; 
    uint16_t _pad;         
};
#pragma pack(pop)
static_assert(sizeof(PacketHeader) == 16, "PacketHeader must be exactly 16 bytes on the wire");

inline constexpr int k_maxPayloadBytes = k_maxPacketBytes - static_cast<int>(sizeof(PacketHeader));
 
} // namespace net