mqttpacket.h
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#ifndef MQTTPACKET_H
#define MQTTPACKET_H
#include "unistd.h"
#include <memory>
#include <vector>
#include <exception>
#include "forward_declarations.h"
#include "client.h"
#include "exceptions.h"
#include "types.h"
#include "subscriptionstore.h"
#include "cirbuf.h"
#include "logger.h"
struct RemainingLength
{
char bytes[4];
int len = 0;
public:
RemainingLength();
};
class MqttPacket
{
std::vector<char> bites;
size_t fixed_header_length = 0; // if 0, this packet does not contain the bytes of the fixed header.
RemainingLength remainingLength;
Client_p sender;
char first_byte = 0;
size_t pos = 0;
ProtocolVersion protocolVersion = ProtocolVersion::None;
Logger *logger = Logger::getInstance();
char *readBytes(size_t length);
char readByte();
void writeByte(char b);
void writeBytes(const char *b, size_t len);
uint16_t readTwoBytesToUInt16();
size_t remainingAfterPos();
void calculateRemainingLength();
public:
PacketType packetType = PacketType::Reserved;
MqttPacket(CirBuf &buf, size_t packet_len, size_t fixed_header_length, Client_p &sender); // Constructor for parsing incoming packets.
// Constructor for outgoing packets. These may not allocate room for the fixed header, because we don't (always) know the length in advance.
MqttPacket(const ConnAck &connAck);
MqttPacket(const SubAck &subAck);
MqttPacket(const Publish &publish);
void handle();
void handleConnect();
void handleSubscribe();
void handlePing();
void handlePublish();
size_t getSizeIncludingNonPresentHeader() const;
const std::vector<char> &getBites() const { return bites; }
Client_p getSender() const;
void setSender(const Client_p &value);
bool containsFixedHeader() const;
char getFirstByte() const;
RemainingLength getRemainingLength() const;
};
#endif // MQTTPACKET_H