FileRegionArchive.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Containers/Array.h"
#include "Serialization/FileRegions.h"
#include "Serialization/LargeMemoryWriter.h"
 
template<typename ArchiveType>
class TFileRegionArchive
    : public ArchiveType
{
public:
    using ArchiveType::ArchiveType;
    using ArchiveType::Tell;
 
    const TArray<FFileRegion>& GetFileRegions() const
    {
        return FileRegions;
    }
 
    virtual void PushFileRegionType(EFileRegionType Type) override final
    {
        check(CurrentRegion.Offset == 0);
        CurrentRegion.Offset = Tell();
        CurrentRegion.Type = Type;
    }
 
    virtual void PopFileRegionType() override final
    {
        CurrentRegion.Length = Tell() - CurrentRegion.Offset;
        FileRegions.Add(CurrentRegion);
        CurrentRegion = FFileRegion();
    }
 
private:
    TArray<FFileRegion> FileRegions;
    FFileRegion CurrentRegion;
};
 
using FFileRegionMemoryWriter = TFileRegionArchive<FLargeMemoryWriter>;