Transmitter.h

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/*
 * SNode.C - A Slim Toolkit for Network Communication
 * Copyright (C) Volker Christian <me@vchrist.at>
 *               2020, 2021, 2022, 2023, 2024, 2025
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
/*
 * MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 */
 
#ifndef WEB_WEBSOCKET_TRANSMITTER_H
#define WEB_WEBSOCKET_TRANSMITTER_H
 
namespace core::socket::stream {
 
    class SocketConnection;
 
}
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include <cstddef>
#include <cstdint>
#include <random>
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
namespace web::websocket {
 
    class Transmitter {
    public:
        Transmitter() = delete;
 
        Transmitter(const Transmitter&) = delete;
        Transmitter& operator=(const Transmitter&) = delete;
 
        virtual ~Transmitter();
 
    protected:
        Transmitter(core::socket::stream::SocketConnection* socketConnection, bool masking);
 
        void sendMessage(uint8_t opCode, const char* message, std::size_t messageLength);
 
        void sendMessageStart(uint8_t opCode, const char* message, std::size_t messageLength);
        void sendMessageFrame(const char* message, std::size_t messageLength);
        void sendMessageEnd(const char* message, std::size_t messageLength);
 
    private:
        void send(bool end, uint8_t opCode, const char* message, std::size_t messageLength);
 
        void sendFrame(bool fin, uint8_t opCode, const char* payload, uint64_t payloadLength);
 
        void sendFrameData(uint8_t data) const;
        void sendFrameData(uint16_t data) const;
        void sendFrameData(uint32_t data) const;
        void sendFrameData(uint64_t data) const;
        void sendFrameData(const char* frame, uint64_t frameLength) const;
 
        std::random_device randomDevice;
        std::uniform_int_distribution<uint32_t> distribution{0, UINT32_MAX};
 
        core::socket::stream::SocketConnection* socketConnection = nullptr;
 
        bool masking = false;
 
    protected:
        bool closeSent = false;
    };
 
} // namespace web::websocket
 
#endif // WEB_WEBSOCKET_TRANSMITTER_H