ArrayReader.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "HAL/UnrealMemory.h"
#include "Containers/Array.h"
#include "Containers/UnrealString.h"
#include "Serialization/MemoryArchive.h"
 
class FArrayReader final : public FMemoryArchive, public TArray<uint8>
{
public:
    FArrayReader( bool bIsPersistent=false )
    {
        this->SetIsLoading(true);
        this->SetIsPersistent(bIsPersistent);
    }
 
    /**
    * Returns the name of the Archive.  Useful for getting the name of the package a struct or object
    * is in when a loading error occurs.
    *
    * This is overridden for the specific Archive Types
    **/
    virtual FString GetArchiveName() const { return TEXT("FArrayReader"); }
 
    int64 TotalSize()
    {
        return (int64)Num();
    }
 
    void Serialize(void* Data, int64 Count)
    {
        if (Count && !IsError())
        {
            // Only serialize if we have the requested amount of data
            if (Offset + Count <= Num())
            {
                FMemory::Memcpy(Data, &((*this)[(int32)Offset]), Count);
                Offset += Count;
            }
            else
            {
                SetError();
            }
        }
    }
};