If you dont mind using zlib you could use this:

http://www.swissdelphicenter.ch/torr...ode.php?id=822

I was also able to find HKStreams:
http://topic.csdn.net/t/20020526/21/754530.html
But I have no idea how good it is.

else have alook at this list:

http://bsdg.org/resources/Delphi_Fre...ml#Compression