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https://github.com/fergalmoran/ladybird.git
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8293a0ff36
This way subclasses only have to implement readBlock() and writeBlock(). read() and write() require that the offset and length are both divisible by the blockSize().
34 lines
956 B
C++
34 lines
956 B
C++
#pragma once
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#include "DiskDevice.h"
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#include <AK/RetainPtr.h>
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#include <AK/String.h>
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#include <AK/Types.h>
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#include <stdio.h>
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class FileBackedDiskDevice final : public DiskDevice {
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public:
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static RetainPtr<FileBackedDiskDevice> create(String&& imagePath, unsigned blockSize);
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virtual ~FileBackedDiskDevice() override;
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bool isValid() const { return m_file; }
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virtual unsigned blockSize() const override;
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virtual bool readBlock(unsigned index, byte* out) const override;
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virtual bool writeBlock(unsigned index, const byte*) override;
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private:
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virtual const char* className() const override;
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bool readInternal(qword offset, unsigned length, byte* out) const;
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bool writeInternal(qword offset, unsigned length, const byte* data);
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FileBackedDiskDevice(String&& imagePath, unsigned blockSize);
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String m_imagePath;
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FILE* m_file { nullptr };
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qword m_fileLength { 0 };
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unsigned m_blockSize { 0 };
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};
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