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72 lines
1.5 KiB
C++
72 lines
1.5 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreTypes.h"
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namespace UE {
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namespace Trace {
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////////////////////////////////////////////////////////////////////////////////
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class FStreamReader
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{
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public:
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~FStreamReader();
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template <typename Type>
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Type const* GetPointer();
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const uint8* GetPointer(uint32 Size);
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void Advance(uint32 Size);
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bool IsEmpty() const;
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struct FMark* SaveMark() const;
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void RestoreMark(struct FMark* Mark);
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protected:
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uint8* Buffer = nullptr;
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uint32 DemandHint = 0;
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uint32 Cursor = 0;
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uint32 End = 0;
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};
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////////////////////////////////////////////////////////////////////////////////
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template <typename Type>
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Type const* FStreamReader::GetPointer()
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{
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return (Type const*)GetPointer(sizeof(Type));
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}
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////////////////////////////////////////////////////////////////////////////////
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class FStreamBuffer
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: public FStreamReader
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{
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public:
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template <typename Lambda>
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int32 Fill(Lambda&& Source);
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void Append(const uint8* Data, uint32 Size);
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uint8* Append(uint32 Size);
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protected:
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void Consolidate();
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uint32 BufferSize = 0;
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};
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////////////////////////////////////////////////////////////////////////////////
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template <typename Lambda>
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inline int32 FStreamBuffer::Fill(Lambda&& Source)
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{
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Consolidate();
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uint8* Dest = Buffer + End;
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int32 ReadSize = Source(Dest, BufferSize - End);
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if (ReadSize > 0)
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{
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End += ReadSize;
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}
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return ReadSize;
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}
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} // namespace Trace
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} // namespace UE
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