A while ago, I wrote a small Go app that reads things from zip files. I
tested it with various zip files (usually Java jar files), and it has
always worked perfectly fine.
Today I'm looking at another jar file. The Java "jar" command likes it
perfectly fine. I could list the contents and extract all the files. Java
had no particular trouble running with the jar file.
When I try to call "zip.OpenReader()" on this jar file, it just gives me
""zip: not a valid zip file"". Well, great.
I then ran a command to run the same command on every jar file in my home
directory tree, where there are a couple of thousand from various tool
distributions. I counted how many failed with that same error. I found
just the one I already have.
This jar file is a little over 12mb. Several of the jar files that don't
fail are quite a bit larger than this. Most of the ones that don't fail are
smaller than this. The permissions on this jar are the same as the others.
I then tried passing this jar file to "unzip". It was able to unzip it, but
it did print this:
warning [<jar file name>]: 3624 extra bytes at beginning or within
zipfile
(attempting to process anyway)
I tried this on some of the working jar files, and it didn't print this
warning.
So, it appears that if anything, this jar file is "nonstandard", but both
unzip and jar have no problem with it, and jar didn't even say there was an
issue with it. The zip package, however, bombs on this with no information.
I'm going to go to the people who gave me that jar file and ask them how
they produced it, but I think it's clear it's not fatally broken.
I haven't submitted a bug report for this package yet, as I wanted some
feedback on this first.
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