Set<String> request = new HashSet<String>();
request.add(".Data.Player");
Map<String, AnyTag> result = NamedTag.quickParse(in, request);
in.close();
AnyTag playerTag = result.get(".Data.Player");
System.out.println("writing output to "+outFn);
DataOutputStream out = new DataOutputStream(new GZIPOutputStream(new FileOutputStream(outFn)));
NamedTag rootTag = new NamedTag(new StringTag(""), (CompoundTag) playerTag);
rootTag.write(out);