VirtualFileSystem/FileBackedDiskDevice.h


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#pragma once

#include "DiskDevice.h"
#include <AK/RetainPtr.h>
#include <AK/AKString.h>
#include <AK/Types.h>
#include <stdio.h>

class FileBackedDiskDevice final : public DiskDevice {
public:
    static RetainPtr<FileBackedDiskDevice> create(String&& image_path, unsigned block_size);
    virtual ~FileBackedDiskDevice() override;

    bool is_valid() const { return m_file; }

    virtual unsigned block_size() const override;
    virtual bool read_block(unsigned index, byte* out) const override;
    virtual bool write_block(unsigned index, const byte*) override;

private:
    virtual const char* class_name() const override;

    bool read_internal(DiskOffset, unsigned length, byte* out) const;
    bool write_internal(DiskOffset, unsigned length, const byte* data);

    FileBackedDiskDevice(String&& imagePath, unsigned block_size);

    String m_image_path;
    FILE* m_file { nullptr };
    DiskOffset m_file_length { 0 };
    unsigned m_block_size { 0 };
};