QGCArchiveDeviceBase.h

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#pragma once
 
 
#include <QtCore/QBuffer>
#include <QtCore/QFile>
#include <QtCore/QIODevice>
 
#include <memory>
 
struct archive;
 
class QGCArchiveDeviceBase : public QIODevice
{
    Q_OBJECT
 
public:
    ~QGCArchiveDeviceBase() override;
 
    // QIODevice interface
    void close() override;
    bool isSequential() const override { return true; }
    qint64 bytesAvailable() const override;
 
    QString errorString() const;
 
    QString formatName() const { return _formatName; }
 
    QString filterName() const { return _filterName; }
 
protected:
    explicit QGCArchiveDeviceBase(const QString &filePath, QObject *parent = nullptr);
 
    explicit QGCArchiveDeviceBase(QIODevice *source, QObject *parent = nullptr);
 
    // QIODevice interface
    qint64 readData(char *data, qint64 maxSize) override;
    qint64 writeData(const char *data, qint64 maxSize) override;
 
    bool initSourceFromPath();
 
    virtual bool initArchive() = 0;
 
    virtual bool prepareForReading() = 0;
 
    virtual bool isReadyToRead() const = 0;
 
    void configureArchiveFormats(bool allFormats);
 
    bool openArchive();
 
    bool fillBuffer();
 
    void captureFormatInfo();
 
    virtual void resetState();
 
    // Source management
    QString _filePath;
    QIODevice *_sourceDevice = nullptr;
    bool _ownsSource = false;
    std::unique_ptr<QIODevice> _ownedSource;
 
    // libarchive state
    struct archive *_archive = nullptr;
    QByteArray _resourceData;  // For Qt resources (must outlive archive)
    bool _eof = false;
 
    // Decompressed data buffer
    QByteArray _buffer;
 
    // Error state
    QString _errorString;
 
    // Format info (populated after first header read)
    QString _formatName;
    QString _filterName;
};