How with sharpziplib get a zip file in memorystream or byte array format and unpack it

I have 开发者_如何学Goan app that downloads from ftp and gets the format in memorystream or byte array-it gets the zip file ALREADY ZIPPED ,how can i use sharpziplib with this input to unpack that content to a specific place on my harddrive

Wrap the raw data in a MemoryStream and then pass this to the zip library instead of a FileStream.