CompressedFileAdapter.hh

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#ifndef COMPRESSEDFILEADAPTER_HH
#define COMPRESSEDFILEADAPTER_HH

#include "FileBase.hh"
#include "MemBuffer.hh"
#include <memory>

namespace openmsx {

class CompressedFileAdapter : public FileBase
{
public:
        struct Decompressed {
                MemBuffer<uint8_t> buf;
                size_t size;
                std::string originalName;
                std::string cachedURL;
                time_t cachedModificationDate;
        };

        void read(void* buffer, size_t num) final override;
        void write(const void* buffer, size_t num) final override;
        span<uint8_t> mmap() final override;
        void munmap() final override;
        size_t getSize() final override;
        void seek(size_t pos) final override;
        size_t getPos() final override;
        void truncate(size_t size) final override;
        void flush() final override;
        std::string getURL() const final override;
        std::string getOriginalName() final override;
        bool isReadOnly() const final override;
        time_t getModificationDate() final override;

protected:
        explicit CompressedFileAdapter(std::unique_ptr<FileBase> file);
        ~CompressedFileAdapter() override;
        virtual void decompress(FileBase& file, Decompressed& decompressed) = 0;

private:
        void decompress();

        std::unique_ptr<FileBase> file;
        std::shared_ptr<Decompressed> decompressed;
        size_t pos;
};

} // namespace openmsx

#endif