static Func<bool> GzipFinished(GZipStream ins)
{
try
{
var g = ins.GetType().GetField("deflateStream", BindingFlags.Instance | BindingFlags.NonPublic);
if (g == null) return null;
var s = (DeflateStream)g.GetValue(ins);
if (s == null) return null;
var f = s.GetType().GetField("inflater", BindingFlags.Instance | BindingFlags.NonPublic);
if (f == null) return null;
var fo = f.GetValue(s);
var avf = fo.GetType().GetProperty("AvailableOutput");
var bterm = fo.GetType().GetField("bfinal", BindingFlags.Instance | BindingFlags.NonPublic);
if (avf == null || bterm == null) return null;
return () =>
(int) avf.GetValue(fo, new object[0]) == 0 // no more data in decode buffer
&& (int)bterm.GetValue(fo) == 1; // have reached end of stream
}
catch (Exception)
{
return null;
}
}