Publish.cpp

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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/>.
 */
 
#include "iot/mqtt/server/packets/Publish.h"
 
#include "iot/mqtt/server/Mqtt.h"
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#endif // DOXYGEN_SHOULD_SKIP_THIS
 
namespace iot::mqtt::server::packets {
 
    Publish::Publish(uint32_t remainingLength, uint8_t flags)
        : iot::mqtt::server::ControlPacketDeserializer(remainingLength, flags, flags) {
        this->flags = flags;
        this->qoS = flags >> 1 & 0x03;
        this->dup = (flags & 0x08) != 0;
        this->retain = (flags & 0x01) != 0;
 
        error = this->qoS > 2;
    }
 
    std::size_t Publish::deserializeVP(iot::mqtt::MqttContext* mqttContext) {
        std::size_t consumed = 0;
 
        switch (state) {
            case 0: // V-Header
                consumed += topic.deserialize(mqttContext);
                if (!topic.isComplete()) {
                    break;
                }
 
                state++;
                [[fallthrough]];
            case 1:
                if (qoS > 0) {
                    consumed += packetIdentifier.deserialize(mqttContext);
                    if (!packetIdentifier.isComplete()) {
                        break;
                    }
                }
 
                message.setSize(static_cast<uint16_t>(getRemainingLength() - getConsumed() - consumed));
 
                state++;
                [[fallthrough]];
            case 2: // Payload
                consumed += message.deserialize(mqttContext);
                if (!message.isComplete()) {
                    break;
                }
 
                complete = true;
                break;
        }
 
        return consumed;
    }
 
    void Publish::deliverPacket(iot::mqtt::server::Mqtt* mqtt) {
        mqtt->printVP(*this);
        mqtt->_onPublish(*this);
    }
 
} // namespace iot::mqtt::server::packets