title: Find the size of the file inside a GZIP file
body: <p>Is there a way to find out the size of the original file which is inside a GZIP file in java?</p>
  
  <p>As in, I have a file a.txt of 15 MB which has been GZipped to a.gz of size 3MB. I want to know the size of a.txt present inside a.gz, without unzipping a.gz.</p>