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Implement FunctionExport serialization and fix a crash in AncestryInfo #128

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Implement FunctionExport serialization and fix a crash in AncestryInfo #128

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fae58cf
Finish FunctionExport serialization code
Nov 2, 2025
adb85a6
Fix crash in AncestryInfo.SetAsParent
Nov 2, 2025
7a5b226
FunctionExport.RepOffset is 2 bytes, not 4
Nov 2, 2025
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44 changes: 39 additions & 5 deletions UAssetAPI/ExportTypes/FunctionExport.cs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
using System.IO;
using UAssetAPI.UnrealTypes;
using System.Reflection.PortableExecutable;
using UAssetAPI.ExportTypes;
using UAssetAPI.UnrealTypes;

namespace UAssetAPI.ExportTypes
{
Expand All @@ -9,7 +10,11 @@ namespace UAssetAPI.ExportTypes
/// </summary>
public class FunctionExport : StructExport
{
public EFunctionFlags FunctionFlags;
public EFunctionFlags FunctionFlags;
public short RepOffset;
public FPackageIndex EventGraphFunction;
public int EventGraphCallOffset;

public FunctionExport(Export super) : base(super)
{
Asset = super.Asset;
Expand All @@ -30,14 +35,43 @@ public override void Read(AssetBinaryReader reader, int nextStarting)
{
base.Read(reader, nextStarting);
FunctionFlags = (EFunctionFlags)reader.ReadUInt32();
// TODO

if (FunctionFlags.HasFlag(EFunctionFlags.FUNC_Net))
{
RepOffset = reader.ReadInt16();
}
else
{
RepOffset = 0;
}

if (reader.Asset.ObjectVersion >= ObjectVersion.VER_UE4_SERIALIZE_BLUEPRINT_EVENTGRAPH_FASTCALLS_IN_UFUNCTION)
{
EventGraphFunction = new(reader.ReadInt32());
EventGraphCallOffset = reader.ReadInt32();
}
else
{
EventGraphFunction = null;
EventGraphCallOffset = 0;
}
}

public override void Write(AssetBinaryWriter writer)
{
base.Write(writer);
writer.Write((uint)FunctionFlags);
// TODO
}

if (FunctionFlags.HasFlag(EFunctionFlags.FUNC_Net))
{
writer.Write(RepOffset);
}

if (writer.Asset.ObjectVersion >= ObjectVersion.VER_UE4_SERIALIZE_BLUEPRINT_EVENTGRAPH_FASTCALLS_IN_UFUNCTION)
{
writer.Write(EventGraphFunction.Index);
writer.Write(EventGraphCallOffset);
}
}
}
}
2 changes: 1 addition & 1 deletion UAssetAPI/PropertyTypes/Objects/PropertyData.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -96,7 +96,7 @@ public void Initialize(AncestryInfo ancestors, FName dad, FName modulePath = nul

public void SetAsParent(FName dad, FName modulePath = null)
{
if (dad != null) Ancestors.Add(string.IsNullOrEmpty(modulePath?.Value?.Value) ? dad : FName.DefineDummy(null, modulePath.Value.Value + "." + dad.Value.Value));
if (dad?.Value != null) Ancestors.Add(string.IsNullOrEmpty(modulePath?.Value?.Value) ? dad : FName.DefineDummy(null, modulePath.Value.Value + "." + dad.Value.Value));
}
}

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