Re: big file warning if compressed

[Richard Stallman]

    > That is because Emacs has no way of telling how big it is
    > until after uncompressing it.

    That's not really true: GNU zip has the --list option, which generates
    output like:

    compressed  uncompr. ratio uncompressed_name
      12574759  58689536  78.5% foo.txt

1. How long does that take?  Does it get the info instantly
or does it have to effectively uncompress the data to get the info?

2. What about other compression formats?

You can try working on this, but I'd rather save it for after the
release.