ToolsRawDataFieldImpl.h

//
// Copyright 2015 - 2026 (C). Alex Robenko. All rights reserved.
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
 
// This file is free software: you can redistribute it and/or modify
// it under the terms of the GNU 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
#pragma once
 
#include "cc_tools_qt/details/ToolsFieldBase.h"
#include "cc_tools_qt/field/ToolsRawDataField.h"
 
#include "comms/field/ArrayList.h"
 
#include <cstdint>
#include <cassert>
#include <memory>
#include <limits>
 
namespace cc_tools_qt
{
 
namespace details
{
 
template <typename TField>
class ToolsRawDataFieldImpl : public ToolsFieldBase<cc_tools_qt::field::ToolsRawDataField, TField>
{
    using Base = ToolsFieldBase<cc_tools_qt::field::ToolsRawDataField, TField>;
    using Field = TField;
 
public:
    using SerialisedSeq = typename Base::SerialisedSeq;
    using Ptr = typename Base::Ptr;
    using ActPtr = typename Base::ActPtr;
 
    explicit ToolsRawDataFieldImpl(Field& fieldRef)
      : Base(fieldRef)
    {
    }
 
    ToolsRawDataFieldImpl(const ToolsRawDataFieldImpl&) = default;
    ToolsRawDataFieldImpl(ToolsRawDataFieldImpl&&) = default;
    virtual ~ToolsRawDataFieldImpl() noexcept = default;
 
    ToolsRawDataFieldImpl& operator=(const ToolsRawDataFieldImpl&) = delete;
 
protected:
 
    virtual QString getValueImpl() const override
    {
        QString retStr;
        auto& dataField = Base::field();
        auto& data = dataField.value();
 
        int maxLen = static_cast<int>(Base::length() * 2);
        if (Base::isTruncated()) {
            maxLen = static_cast<decltype(maxLen)>(Base::TruncateLength * 2);
        }
 
        for (auto byte : data) {
            if (maxLen <= retStr.size()) {
                break;
            }
 
            retStr.append(QString("%1").arg(static_cast<uint>(byte), 2, 16, QChar('0')));
        }
        return retStr;
    }
 
    virtual void setValueImpl(const QString& val) override
    {
        SerialisedSeq data;
        QString byteStr;
 
        auto addByteToData =
            [&data, &byteStr]() mutable
            {
                bool ok = false;
                auto intVal = byteStr.toInt(&ok, 16);
                if (!ok) {
                    return;
                }
 
                data.push_back(static_cast<typename SerialisedSeq::value_type>(intVal));
                byteStr.clear();
            };
 
        for (auto ch : val) {
            if (((ch < '0') || ('9' < ch)) &&
                ((ch.toLower() < 'a') || ('f' < ch.toLower()))) {
                continue;
            }
 
            byteStr.append(ch);
 
            if (2 <= byteStr.size()) {
                addByteToData();
            }
        }
 
        if (!byteStr.isEmpty()) {
            byteStr.append('0');
            addByteToData();
        }
 
        Base::setSerialisedValueImpl(data);
    }
 
    virtual SerialisedSeq getSerialisedValueImpl() const override
    {
        auto serValue = Base::getSerialisedValueImpl();
        if (Base::isTruncated()) {
            serValue.resize(Base::TruncateLength);
        }
 
        return serValue;
    }
 
    virtual bool setSerialisedValueImpl([[maybe_unused]] const SerialisedSeq& value) override
    {
        [[maybe_unused]] static constexpr bool Must_not_be_called = false;
        assert(Must_not_be_called);
        return false;
    }
 
    virtual int maxSizeImpl() const override
    {
        return maxSizeInternal(SizeExistanceTag());
    }
 
    virtual int minSizeImpl() const override
    {
        return minSizeInternal(SizeExistanceTag());
    }
 
    virtual Ptr cloneImpl() override
    {
        return ActPtr(new ToolsRawDataFieldImpl<TField>(Base::field()));
    }
 
private:
    struct SizeFieldExistsTag {};
    struct SerLengthFieldExistsTag {};
    struct FixedSizeTag {};
    struct NoLimitsTag {};
 
    using SizeExistanceTag =
        std::conditional_t<
            Field::hasSizeFieldPrefix(),
            SizeFieldExistsTag,
            std::conditional_t<
                Field::hasSerLengthFieldPrefix(),
                SerLengthFieldExistsTag,
                std::conditional_t<
                    Field::hasFixedSize(),
                    FixedSizeTag,
                    NoLimitsTag
                >
            >
        >;
 
    template <typename TPrefixField>
    static int maxSizeByPrefix()
    {
        if (sizeof(int) <= TPrefixField::maxLength()) {
            return std::numeric_limits<int>::max();
        }
 
        auto shift =
            TPrefixField::maxLength() * std::numeric_limits<std::uint8_t>::digits;
 
        return static_cast<int>((1U << shift) - 1);
    }
 
    static int maxSizeInternal(SizeFieldExistsTag)
    {
        using PrefixField = typename Field::SizeFieldPrefix;
        return maxSizeByPrefix<PrefixField>();
    }
 
    static int maxSizeInternal(SerLengthFieldExistsTag)
    {
        using PrefixField = typename Field::SerLengthFieldPrefix;
        return maxSizeByPrefix<PrefixField>();
    }
 
    static int maxSizeInternal(FixedSizeTag)
    {
        return static_cast<int>(Field::fixedSize());
    }
 
    int maxSizeInternal(NoLimitsTag) const
    {
        return
            static_cast<int>(
                std::min(
                    static_cast<std::size_t>(std::numeric_limits<int>::max()),
                    Base::field().value().max_size()));
    }
 
    static int minSizeInternal(SizeFieldExistsTag)
    {
        return 0;
    }
 
    static int minSizeInternal(SerLengthFieldExistsTag)
    {
        return 0;
    }
 
    static int minSizeInternal(FixedSizeTag)
    {
        return static_cast<int>(Field::fixedSize());
    }
 
    int minSizeInternal(NoLimitsTag) const
    {
        return 0;
    }
};
 
template <typename TField>
auto makeRawDataField(TField& field)
{
    return std::make_unique<ToolsRawDataFieldImpl<TField>>(field);
}
 
}  // namespace details
 
}  // namespace cc_tools_qt