FCachedFileHandle Class Reference

#include <IPlatformFileCachedWrapper.h>

Inheritance diagram for FCachedFileHandle:

Public Member Functions
	FCachedFileHandle (IFileHandle *InFileHandle, bool bInReadable, bool bInWritable)
virtual	~FCachedFileHandle ()
virtual int64	Tell () override
virtual bool	Seek (int64 NewPosition) override
virtual bool	SeekFromEnd (int64 NewPositionRelativeToEnd=0) override
virtual bool	Read (uint8 *Destination, int64 BytesToRead) override
virtual bool	ReadAt (uint8 *Destination, int64 BytesToRead, int64 Offset) override
virtual bool	Write (const uint8 *Source, int64 BytesToWrite) override
virtual int64	Size () override
virtual bool	Flush (const bool bFullFlush=false) override
virtual bool	Truncate (int64 NewSize) override
virtual void	ShrinkBuffers () override
Public Member Functions inherited from IFileHandle
virtual	~IFileHandle ()

Constructor & Destructor Documentation

FCachedFileHandle()

FCachedFileHandle::FCachedFileHandle ( IFileHandle *  InFileHandle, bool  bInReadable, bool  bInWritable  )

inline

~FCachedFileHandle()

virtual FCachedFileHandle::~FCachedFileHandle ( )

inlinevirtual

Member Function Documentation

Flush()

virtual bool FCachedFileHandle::Flush ( const bool  bFullFlush = false )

inlineoverridevirtual

Flushes file handle to disk.

Parameters

bFullFlush

true to flush everything about the file (including its meta-data) with a strong guarantee that it will be on disk by the time this function returns, or false to let the operating/file system have more leeway about when the data actually gets written to disk

Returns

true if operation completed successfully.

Implements IFileHandle.

Read()

virtual bool FCachedFileHandle::Read ( uint8 *  Destination, int64  BytesToRead  )

inlineoverridevirtual

Read bytes from the file.

Parameters

Destination	Buffer to holds the results, should be at least BytesToRead in size.
BytesToRead	Number of bytes to read into the destination.

Returns

true if the operation completed successfully. Returns false if a read is attempted while the read position is already at the end of the file.

Remarks

If BytesToRead is larger than the bytes remaining in the file from the current read position the Read() will return true if the underlying file read could read all remaining bytes.

Implements IFileHandle.

ReadAt()

virtual bool FCachedFileHandle::ReadAt ( uint8 *  Destination, int64  BytesToRead, int64  Offset  )

inlineoverridevirtual

Implements IFileHandle.

Seek()

virtual bool FCachedFileHandle::Seek ( int64  NewPosition )

inlineoverridevirtual

Change the current write or read position.

Parameters

NewPosition

new write or read position

Returns

true if the operation completed successfully.

Implements IFileHandle.

SeekFromEnd()

virtual bool FCachedFileHandle::SeekFromEnd ( int64  NewPositionRelativeToEnd = 0 )

inlineoverridevirtual

Change the current write or read position, relative to the end of the file.

Parameters

NewPositionRelativeToEnd

new write or read position, relative to the end of the file should be <=0!

Returns

true if the operation completed successfully.

Implements IFileHandle.

ShrinkBuffers()

virtual void FCachedFileHandle::ShrinkBuffers ( )

inlineoverridevirtual

Minimizes optional system or process cache kept for the file.

Reimplemented from IFileHandle.

Size()

virtual int64 FCachedFileHandle::Size ( )

inlineoverridevirtual

Return the total size of the file

Reimplemented from IFileHandle.

Tell()

virtual int64 FCachedFileHandle::Tell ( )

inlineoverridevirtual

Return the current write or read position.

Implements IFileHandle.

Truncate()

virtual bool FCachedFileHandle::Truncate ( int64  NewSize )

inlineoverridevirtual

Truncate the file to the given size (in bytes).

Parameters

NewSize

Truncated file size (in bytes).

Returns

true if the operation completed successfully.

Implements IFileHandle.

Write()

virtual bool FCachedFileHandle::Write ( const uint8 *  Source, int64  BytesToWrite  )

inlineoverridevirtual

Write bytes to the file.

Parameters

Source	Buffer to write, should be at least BytesToWrite in size.
BytesToWrite	Number of bytes to write.

Returns

true if the operation completed successfully.

Implements IFileHandle.

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The documentation for this class was generated from the following file:

• Engine/Source/Runtime/Core/Public/HAL/IPlatformFileCachedWrapper.h