public static void Compute(Loop loop, string file)
{
var @in = new UVFileStream(loop);
@in.Open(file, UVFileAccess.Read, (ex) => {
HashStream.ComputeString(SHA1Managed.Create(), @in, (str) => {
Console.WriteLine ("{0} {1}", str, file);
});
@in.Resume();
});
}