115 lines
3.8 KiB
C++
115 lines
3.8 KiB
C++
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// Copyright Epic Games, Inc. All Rights Reserved.
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#include "Serialization/ArchiveObjectCrc32.h"
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#include "UObject/Object.h"
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DEFINE_LOG_CATEGORY_STATIC(LogArchiveObjectCrc32, Log, All);
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// #define DEBUG_ARCHIVE_OBJECT_CRC32
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/*----------------------------------------------------------------------------
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FArchiveObjectCrc32
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----------------------------------------------------------------------------*/
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FArchiveObjectCrc32::FArchiveObjectCrc32()
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: MemoryWriter(SerializedObjectData), ObjectBeingSerialized(NULL), RootObject(NULL)
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{
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ArIgnoreOuterRef = true;
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// Set FArchiveObjectCrc32 to be a saving archive instead of a reference collector.
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// Reference collection causes FSoftObjectPtrs to be serialized by their weak pointer,
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// which doesn't give a stable CRC. Serializing these to a saving archive will
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// use a string reference instead, which is a more meaningful CRC'able state.
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SetIsSaving(true);
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}
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void FArchiveObjectCrc32::Serialize(void* Data, int64 Length)
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{
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MemoryWriter.Serialize(Data, Length);
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}
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FArchive& FArchiveObjectCrc32::operator<<(class FName& Name)
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{
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checkSlow(ObjectBeingSerialized);
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// Don't include the name of the object being serialized, since that isn't technically part of the object's state
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if (Name != ObjectBeingSerialized->GetFName())
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{
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MemoryWriter << Name;
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}
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return *this;
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}
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FArchive& FArchiveObjectCrc32::operator<<(class UObject*& Object)
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{
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FArchive& Ar = *this;
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if (!Object || !Object->IsIn(RootObject))
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{
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auto UniqueName = GetPathNameSafe(Object);
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Ar << UniqueName;
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}
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else
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{
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ObjectsToSerialize.Enqueue(Object);
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}
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return Ar;
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}
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uint32 FArchiveObjectCrc32::Crc32(UObject* Object, uint32 CRC)
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{
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#ifdef DEBUG_ARCHIVE_OBJECT_CRC32
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const double StartTime = FPlatformTime::Seconds();
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UE_LOG(LogArchiveObjectCrc32, Log, TEXT("### Calculating CRC for object: %s with outer: %s"), *Object->GetName(), Object->GetOuter() ? *Object->GetOuter()->GetName() : TEXT("NULL"));
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#endif
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RootObject = Object;
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if (Object)
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{
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TSet<UObject*> SerializedObjects;
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// Start with the given object
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ObjectsToSerialize.Enqueue(Object);
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// Continue until we no longer have any objects to serialized
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while (ObjectsToSerialize.Dequeue(Object))
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{
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bool bAlreadyProcessed = false;
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SerializedObjects.Add(Object, &bAlreadyProcessed);
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// If we haven't already serialized this object
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if (!bAlreadyProcessed)
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{
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#ifdef DEBUG_ARCHIVE_OBJECT_CRC32
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UE_LOG(LogArchiveObjectCrc32, Log, TEXT("- Serializing object: %s with outer: %s"), *Object->GetName(), Object->GetOuter() ? *Object->GetOuter()->GetName() : TEXT("NULL"));
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#endif
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// Serialize it
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ObjectBeingSerialized = Object;
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if (!CustomSerialize(Object))
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{
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Object->Serialize(*this);
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}
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ObjectBeingSerialized = NULL;
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// Calculate the CRC, compounding it with the checksum calculated from the previous object
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CRC = FCrc::MemCrc32(SerializedObjectData.GetData(), SerializedObjectData.Num(), CRC);
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#ifdef DEBUG_ARCHIVE_OBJECT_CRC32
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UE_LOG(LogArchiveObjectCrc32, Log, TEXT("=> object: '%s', total size: %d bytes, checksum: 0x%08x"), *GetPathNameSafe(Object), SerializedObjectData.Num(), CRC);
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#endif
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// Cleanup
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MemoryWriter.Seek(0L);
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SerializedObjectData.Empty();
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}
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}
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// Cleanup
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SerializedObjects.Empty();
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RootObject = NULL;
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}
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#ifdef DEBUG_ARCHIVE_OBJECT_CRC32
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UE_LOG(LogArchiveObjectCrc32, Log, TEXT("### Finished (%.02f ms), final checksum: 0x%08x"), (FPlatformTime::Seconds() - StartTime) * 1000.0f, CRC);
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#endif
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return CRC;
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}
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