public async Task <int> BuildCompressedChunkBlockData(ByteArrayReader reader)
{
UncompressedSize = reader.Remaining;
byte[] compressed = await reader.Compress();
CompressedData = ByteArrayReader.CreateNew(compressed, 0);
await CompressedData.Encrypt(); // TODO: Fix this to use the flag
CompressedSize = CompressedData.Remaining;
return(CompressedSize + sizeof(int) * 2);
}