I am trying to write a function which will accept an InputStream
with zipped file data and would return another InputStream
with unzipped data.
Unless I'm missing something, you should absolutely try and get ZipInputStream to work and there's no reason it shouldn't (I've certainly used it on several occasions).
What you should do is try and get ZipInputStream
to work and if you can't, post the code and we'll help you with whatever problems you're having.
Whatever you do though, don't try and reinvent its functionality.