public FByteBulkDataHeader(FAssetArchive Ar)
{
BulkDataFlags = Ar.Read <EBulkDataFlags>();
ElementCount = BulkDataFlags.HasFlag(BULKDATA_Size64Bit) ? (int)Ar.Read <long>() : Ar.Read <int>();
SizeOnDisk = BulkDataFlags.HasFlag(BULKDATA_Size64Bit) ? (uint)Ar.Read <long>() : Ar.Read <uint>();
OffsetInFile = Ar.Ver >= EUnrealEngineObjectUE4Version.BULKDATA_AT_LARGE_OFFSETS ? Ar.Read <long>() : Ar.Read <int>();
if (!BulkDataFlags.HasFlag(BULKDATA_NoOffsetFixUp)) // UE4.26 flag
{
OffsetInFile += Ar.Owner.Summary.BulkDataStartOffset;
}
if (BulkDataFlags.HasFlag(BULKDATA_BadDataVersion))
{
Ar.Position += sizeof(ushort);
BulkDataFlags &= ~BULKDATA_BadDataVersion;
}
}
public FByteBulkData(FAssetArchive Ar)
{
Header = new FByteBulkDataHeader(Ar);
BulkDataFlags = Header.BulkDataFlags;
if (Header.ElementCount == 0)
{
// Nothing to do here
}
else if (BulkDataFlags.HasFlag(BULKDATA_Unused))
{
Log.Warning("Bulk with no data");
}
else if (BulkDataFlags.HasFlag(BULKDATA_ForceInlinePayload))
{
#if DEBUG
Log.Debug($"bulk data in .uexp file (Force Inline Payload) (flags={BulkDataFlags}, pos={Header.OffsetInFile}, size={Header.SizeOnDisk}))");
#endif
Data = new byte[Header.ElementCount];
Ar.Read(Data, 0, Header.ElementCount);
}
else if (BulkDataFlags.HasFlag(BULKDATA_OptionalPayload))
{
#if DEBUG
Log.Debug($"bulk data in .uptnl file (Optional Payload) (flags={BulkDataFlags}, pos={Header.OffsetInFile}, size={Header.SizeOnDisk}))");
#endif
if (!Ar.TryGetPayload(PayloadType.UPTNL, out var uptnlAr) || uptnlAr == null)
{
return;
}
Data = new byte[Header.ElementCount];
uptnlAr.Position = Header.OffsetInFile;
uptnlAr.Read(Data, 0, Header.ElementCount);
}
else if (BulkDataFlags.HasFlag(BULKDATA_PayloadInSeperateFile))
{
#if DEBUG
Log.Debug($"bulk data in .ubulk file (Payload In Separate File) (flags={BulkDataFlags}, pos={Header.OffsetInFile}, size={Header.SizeOnDisk}))");
#endif
if (!Ar.TryGetPayload(PayloadType.UBULK, out var ubulkAr) || ubulkAr == null)
{
return;
}
Data = new byte[Header.ElementCount];
ubulkAr.Position = Header.OffsetInFile;
ubulkAr.Read(Data, 0, Header.ElementCount);
}
else if (BulkDataFlags.HasFlag(BULKDATA_PayloadAtEndOfFile))
{
#if DEBUG
Log.Debug($"bulk data in .uexp file (Payload At End Of File) (flags={BulkDataFlags}, pos={Header.OffsetInFile}, size={Header.SizeOnDisk}))");
#endif
//stored in same file, but at different position
//save archive position
var savePos = Ar.Position;
if (Header.OffsetInFile + Header.ElementCount <= Ar.Length)
{
Data = new byte[Header.ElementCount];
Ar.Position = Header.OffsetInFile;
Ar.Read(Data, 0, Header.ElementCount);
}
else
{
throw new ParserException(Ar, $"Failed to read PayloadAtEndOfFile, {Header.OffsetInFile} is out of range");
}
Ar.Position = savePos;
}
else if (BulkDataFlags.HasFlag(BULKDATA_CompressedZlib))
{
throw new ParserException(Ar, "TODO: CompressedZlib");
}
}