public FObjectExport(FPackageFileSummary InSum)
{
Sum = InSum;
}
private static void ProcessFile(string Path, string OutPath)
{
using (var Input = File.OpenRead(Path))
{
using (var Reader = new BinaryReader(Input))
{
var Sum = new FPackageFileSummary();
Sum.Deserialize(Reader);
if ((Sum.CompressionFlags & ECompressionFlags.COMPRESS_ZLIB) == 0)
{
throw new Exception("Unsupported CompressionFlags");
}
// Decrypt the rest of the package header
var EncryptedSize = Sum.TotalHeaderSize - Sum.GarbageSize - Sum.NameOffset;
EncryptedSize = (EncryptedSize + 15) & ~15; // Round up to the next block
var EncryptedData = new byte[EncryptedSize];
Input.Seek(Sum.NameOffset, SeekOrigin.Begin);
Input.Read(EncryptedData, 0, EncryptedData.Length);
var DecryptedData = Decrypt(EncryptedData);
var ChunkInfo = new TArray <FCompressedChunkInfo>(() => new FCompressedChunkInfo(Sum));
using (var DecryptedStream = new MemoryStream(DecryptedData))
{
using (var DecryptedReader = new BinaryReader(DecryptedStream))
{
// Get the compressed chunk info from inside the encrypted data
DecryptedStream.Seek(Sum.CompressedChunkInfoOffset, SeekOrigin.Begin);
ChunkInfo.Deserialize(DecryptedReader);
// Store exports for reserialization
DecryptedStream.Seek(Sum.ExportOffset - Sum.NameOffset, SeekOrigin.Begin);
}
}
// Copy the original file data
var FileBuf = new byte[Input.Length];
Input.Seek(0, SeekOrigin.Begin);
Input.Read(FileBuf, 0, FileBuf.Length);
// Save to output file
using (var Output = File.Open(OutPath, FileMode.Create))
{
Output.Write(FileBuf, 0, FileBuf.Length);
// Write decrypted data
Output.Seek(Sum.NameOffset, SeekOrigin.Begin);
Output.Write(DecryptedData, 0, DecryptedData.Length);
// Decompress compressed chunks
foreach (var Chunk in ChunkInfo)
{
Input.Seek(Chunk.CompressedOffset, SeekOrigin.Begin);
var Header = new FCompressedChunkHeader();
Header.Deserialize(Reader);
var TotalBlockSize = 0;
var Blocks = new List <FCompressedChunkBlock>();
while (TotalBlockSize < Header.Sum.UncompressedSize)
{
var Block = new FCompressedChunkBlock();
Block.Deserialize(Reader);
Blocks.Add(Block);
TotalBlockSize += Block.UncompressedSize;
}
Output.Seek(Chunk.UncompressedOffset, SeekOrigin.Begin);
foreach (var Block in Blocks)
{
var CompressedData = new byte[Block.CompressedSize];
Input.Read(CompressedData, 0, CompressedData.Length);
// Zlib inflate
var ZlibStream = new InflaterInputStream(new MemoryStream(CompressedData));
ZlibStream.CopyTo(Output);
}
}
}
}
}
}
public FCompressedChunkInfo(FPackageFileSummary InSum)
{
Sum = InSum;
}
