tdesktop/Telegram/SourceFiles/mtproto/connection_tcp.h

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/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.
For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#pragma once
#include "mtproto/auth_key.h"
#include "mtproto/connection_abstract.h"
#include "base/timer.h"
namespace MTP {
namespace internal {
class TcpConnection : public AbstractConnection {
public:
TcpConnection(QThread *thread);
void setProxyOverride(const ProxyData &proxy) override;
TimeMs pingTime() const override;
void sendData(mtpBuffer &buffer) override;
void disconnectFromServer() override;
void connectToServer(
const QString &address,
int port,
const bytes::vector &protocolSecret,
int16 protocolDcId) override;
bool isConnected() const override;
int32 debugState() const override;
QString transport() const override;
QString tag() const override;
private:
enum class Status {
Waiting = 0,
Ready,
Finished,
};
static constexpr auto kShortBufferSize = 65535; // Of ints, 256 kb.
void socketRead();
void writeConnectionStart();
void socketPacket(const char *packet, uint32 length);
void socketConnected();
void socketDisconnected();
void socketError(QAbstractSocket::SocketError e);
void handleTimeout();
static mtpBuffer handleResponse(const char *packet, uint32 length);
static void handleError(QAbstractSocket::SocketError e, QTcpSocket &sock);
static uint32 fourCharsToUInt(char ch1, char ch2, char ch3, char ch4) {
char ch[4] = { ch1, ch2, ch3, ch4 };
return *reinterpret_cast<uint32*>(ch);
}
void sendBuffer(mtpBuffer &buffer);
QTcpSocket _socket;
uint32 _packetIndex = 0; // sent packet number
uint32 _packetRead = 0;
uint32 _packetLeft = 0; // reading from socket
bool _readingToShort = true;
mtpBuffer _longBuffer;
mtpPrime _shortBuffer[kShortBufferSize];
char *_currentPosition = nullptr;
uchar _sendKey[CTRState::KeySize];
CTRState _sendState;
uchar _receiveKey[CTRState::KeySize];
CTRState _receiveState;
int16 _protocolDcId = 0;
bytes::vector _protocolSecret;
Status _status = Status::Waiting;
MTPint128 _checkNonce;
QString _address;
int32 _port = 0;
int32 _timeout = 0;
base::Timer _timeoutTimer;
TimeMs _pingTime = 0;
};
} // namespace internal
} // namespace MTP