UIntV.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/types/UIntV.h"
 
#include "iot/mqtt/MqttContext.h"
#include "iot/mqtt/types/TypeBase.hpp" // IWYU pragma: keep
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include <vector>
 
#endif // DOXYGEN_SHOULD_SKIP_THIS
 
namespace iot::mqtt::types {
 
    UIntV::UIntV()
        : TypeBase(0) {
    }
 
    UIntV::~UIntV() {
    }
 
    std::size_t UIntV::deserialize(MqttContext* mqttContext) {
        std::size_t consumed = 0;
 
        do {
            char byte = 0;
            consumed = mqttContext->recv(&byte, 1);
 
            if (consumed > 0) {
                value.push_back(byte);
 
                if (value.size() > sizeof(uint32_t)) {
                    error = true;
                } else {
                    complete = (byte & 0x80) == 0;
                }
            }
        } while (consumed > 0 && !complete && !error);
 
        return consumed;
    }
 
    UIntV& UIntV::operator=(const uint32_t& newValue) {
        uint32_t remainingValue = newValue;
        value.clear();
 
        do {
            char encodedByte = static_cast<char>(remainingValue % 0x80);
 
            remainingValue /= 0x80;
            if (remainingValue > 0) {
                encodedByte |= static_cast<char>(0x80);
            }
 
            value.push_back(encodedByte);
        } while (remainingValue > 0);
 
        return *this;
    }
 
    UIntV::operator uint32_t() const {
        uint32_t uint32Value = 0;
        uint32_t multiplicator = 1;
 
        for (std::size_t i = 0; i < value.size(); i++, multiplicator *= 0x80) {
            uint32Value += static_cast<uint8_t>(value[i] & 0x7F) * multiplicator;
        }
 
        return uint32Value;
    }
 
    bool UIntV::isError() const {
        return error;
    }
 
    void UIntV::reset([[maybe_unused]] std::size_t size) {
        error = false;
 
        TypeBase::reset(0);
    }
 
} // namespace iot::mqtt::types