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#rb devin.doucette #jira none #ROBOMERGE-SOURCE: CL 17056895 in //UE5/Main/... #ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v850-17047176) [CL 17056908 by stefan boberg in ue5-release-engine-test branch]
54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "Containers/Array.h"
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#include "HAL/Platform.h"
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#include "HAL/UnrealMemory.h"
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#include "Memory/CompositeBuffer.h"
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#include "Memory/SharedBuffer.h"
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#include "Misc/AssertionMacros.h"
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namespace UE::Zen {
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/** Copy Size bytes from Source at offset SourceOffset into Dest at offset 0. */
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inline void Memcpy(void* Dest, const FCompositeBuffer& Source, size_t SourceOffset, size_t Size)
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{
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uint64 Offset = 0;
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uint64 EndOffset = SourceOffset + Size;
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for (const FSharedBuffer& Segment : Source.GetSegments())
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{
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uint64 SegmentEnd = Offset + Segment.GetSize();
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bool bDone = false;
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if (SegmentEnd > EndOffset)
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{
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bDone = true;
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SegmentEnd = EndOffset;
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}
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if (Offset < SourceOffset)
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{
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if (SegmentEnd >= SourceOffset)
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{
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const uint8* SegData = reinterpret_cast<const uint8*>(Segment.GetData()) + (SourceOffset - Offset);
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uint64 CopySize = SegmentEnd - SourceOffset;
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FMemory::Memcpy(Dest, SegData, CopySize);
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Dest = static_cast<uint8*>(Dest) + CopySize;
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}
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}
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else
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{
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uint64 CopySize = SegmentEnd - Offset;
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FMemory::Memcpy(Dest, Segment.GetData(), CopySize);
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Dest = static_cast<uint8*>(Dest) + CopySize;
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}
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Offset = SegmentEnd;
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if (bDone)
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{
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break;
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}
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}
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check(Offset == EndOffset);
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}
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} // namespace UE::Zen
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