Make comparing big archive files smarter?

[przemo20]

Currently, if you select to compare two, let's say, 200 MB .ZIP files, the program first unpacks both of them and then compares the files – that's OK with different files, but if we try to compare identical archive files (just with two different names) unpacking step is unnecessary (unpacked files just take your disk space for no reason); checking like MD5 checksums (comparing file sizes, or something else that wouldn't increase the time to compare DIFFERENT, not identical files) should be the first step when comparing the archives, to see if the files are identical, if not, you can proceed unpacking the files, if yes, just display a message saying that these files are identical – I don't think there's a need to display a detailed list of each file contained in the archive with the text “Binary files are identical” next to it.