>It's a stream-oriented format. There are no file-global offsets or lengths. There are some relative lengths and offsets, but they're going to be 8 or 16 bit values. Most of the tests you're suggesting don't look particularly useful.
I don't think that streaming vs file is relevant. The deflate algorithm (stream) may have no global knowledge of the eventual file size but the gzip file format does.
Anyways, even with a cursory google search, we can find a compression bug related to file sizes:
