Improve error message when attempting to open an empty zip
The bug report states that the behaviour of ZipFile has changed between 4.3 and
4.4 when opening an empty zip file. I did some investigation and it appears as
though the reference implementation also throws an exception in that case so I
decided that 4.4 is working as designed. However, to make it clearer I made a
minor change to explicitly check for an empty zip file so that we can report a
slightly improved message explaining that they are not supported. I added a
test for various forms of empty streams and zip files and removed part of an
older test from harmony tests as it is no longer necessary.
Bug: https://code.google.com/p/android/issues/detail?id=65380
Change-Id: I1f2fcbf6bbaedb7dbccf8dd4f1cec4e330274524
6 files changed