OutputDeviceMemory.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Containers/Array.h"
#include "CoreTypes.h"
#include "HAL/CriticalSection.h"
#include "Logging/LogVerbosity.h"
#include "Misc/OutputDevice.h"
#include "Serialization/Archive.h"
#include "UObject/NameTypes.h"
 
class FOutputDeviceMemory : public FOutputDevice
{
public:
    CORE_API FOutputDeviceMemory(int32 InPreserveSize = 256 * 1024, int32 InBufferSize = 2048 * 1024, bool bInSuppressEventTag = false);
    
    CORE_API ~FOutputDeviceMemory();
 
    CORE_API virtual void Dump(FArchive& Ar) override;
 
    //~ Begin FOutputDevice Interface.
    CORE_API virtual void TearDown() override;
 
    CORE_API virtual void Flush() override;
 
    CORE_API virtual void Serialize( const TCHAR* Data, ELogVerbosity::Type Verbosity, const class FName& Category, const double Time ) override;
    CORE_API virtual void Serialize( const TCHAR* Data, ELogVerbosity::Type Verbosity, const class FName& Category) override;
    virtual bool CanBeUsedOnAnyThread() const override
    {
        return true;
    }
    virtual bool CanBeUsedOnPanicThread() const override
    {
        return true;
    }
    virtual bool IsMemoryOnly() const override
    {
        return true;
    }
    //~ End FOutputDevice Interface.
 
private:
    
    CORE_API void SerializeToBuffer(ANSICHAR* Data, int32 Length);
 
 
    class FOutputDeviceMemoryProxyArchive : public FArchive
    {
        FOutputDeviceMemory& OutputDevice;
    public:
        FOutputDeviceMemoryProxyArchive(FOutputDeviceMemory& InOutputDevice)
            : OutputDevice(InOutputDevice)
        {}
        virtual void Serialize(void* V, int64 Length) override
        {
            OutputDevice.SerializeToBuffer((ANSICHAR*)V, Length / sizeof(ANSICHAR));
        }
    } ArchiveProxy;
 
    TArray<ANSICHAR> Buffer;
    int32 BufferStartPos;
    int32 BufferLength;
    int32 PreserveSize;
    FCriticalSection BufferPosCritical;
};