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#rb Zousar.Shaker #rnx #preflight 61badf093961edbe76d77bf1 #ROBOMERGE-AUTHOR: devin.doucette #ROBOMERGE-SOURCE: CL 18475378 in //UE5/Release-5.0/... via CL 18481136 #ROBOMERGE-BOT: STARSHIP (Release-Engine-Staging -> Release-Engine-Test) (v899-18417669) [CL 18481156 by devin doucette in ue5-release-engine-test branch]
87 lines
2.6 KiB
C++
87 lines
2.6 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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#include "Containers/Array.h"
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#include "DerivedDataBackendInterface.h"
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#include "HAL/UnrealMemory.h"
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#include "Memory/MemoryView.h"
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#include "Misc/Crc.h"
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#include "Serialization/Archive.h"
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namespace UE::DerivedData::CacheStore
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{
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/**
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* Helper class for placing a footer at the end of of a cache file.
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* No effort is made to byte-swap this as we assume local format.
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*/
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struct FDerivedDataTrailer
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{
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/** Arbitrary number used to identify corruption */
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static constexpr inline uint32 MagicConstant = 0x1e873d89;
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/** Arbitrary number used to identify corruption */
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uint32 Magic = 0;
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/** Version of the trailer */
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uint32 Version = 0;
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/** CRC of the payload, used to detect corruption */
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uint32 CRCofPayload = 0;
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/** Size of the payload, used to detect corruption */
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uint32 SizeOfPayload = 0;
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FDerivedDataTrailer() = default;
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explicit FDerivedDataTrailer(const FMemoryView Data)
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: Magic(MagicConstant)
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, Version(1)
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, CRCofPayload(FCrc::MemCrc_DEPRECATED(Data.GetData(), IntCastChecked<int32>(Data.GetSize())))
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, SizeOfPayload(uint32(Data.GetSize()))
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{
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}
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bool operator==(const FDerivedDataTrailer& Other) const
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{
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return Magic == Other.Magic
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&& Version == Other.Version
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&& CRCofPayload == Other.CRCofPayload
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&& SizeOfPayload == Other.SizeOfPayload;
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}
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};
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class FCorruptionWrapper
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{
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public:
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static bool ReadTrailer(TArray<uint8>& Data, const TCHAR* CacheName, const TCHAR* CacheKey)
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{
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if (Data.Num() < sizeof(FDerivedDataTrailer))
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{
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UE_LOG(LogDerivedDataCache, Display, TEXT("%s: Corrupted file (short), ignoring and deleting %s."), CacheName, CacheKey);
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return false;
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}
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FDerivedDataTrailer Trailer;
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FMemory::Memcpy(&Trailer, &Data[Data.Num() - sizeof(FDerivedDataTrailer)], sizeof(FDerivedDataTrailer));
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Data.RemoveAt(Data.Num() - sizeof(FDerivedDataTrailer), sizeof(FDerivedDataTrailer), /*bAllowShrinking*/ false);
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FDerivedDataTrailer RecomputedTrailer(MakeMemoryView(Data));
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if (!(Trailer == RecomputedTrailer))
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{
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UE_LOG(LogDerivedDataCache, Display, TEXT("%s: Corrupted file, ignoring and deleting %s."), CacheName, CacheKey);
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return false;
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}
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return true;
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}
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static void WriteTrailer(FArchive& Ar, TConstArrayView<uint8> Data, const TCHAR* CacheName, const TCHAR* CacheKey)
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{
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checkf(Ar.TotalSize() + sizeof(FDerivedDataTrailer) <= MAX_int32,
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TEXT("%s: Appending the trailer makes the data exceed 2 GiB for %s"), CacheName, CacheKey);
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FDerivedDataTrailer Trailer(MakeMemoryView(Data));
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Ar.Serialize(&Trailer, sizeof(FDerivedDataTrailer));
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}
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};
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} // UE::DerivedData::CacheStore
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