[Jazzlib-developers] java.util.ZipFile fix

[<joe...@gm...>]

Hello,

you have done a good job, I use jazzlib as a replacement for java.util.zip 
(which does not work) for a Swing-based Zip tool.

First let me allow the hint that Sun does not permit the usage of "java.util" 
packages for third parties. Maybe you get into trouble.

Now my contribution. There is a bug in your java.util.ZipFile. 

According to 

    www.pkware.com/support/appnote.html

there can be variable-length comments at the end of the file. Your code 
assumes the central directory size is fixed, but it's not. Some "odd" Zips 
will fail with a ZipException "Missing end of central directory".

Attached you find a util.ZipFile source file for your convenience.  It fixes 
this bug by seeking backward from end of file minus minimum size of the 
central directory. All Zips I have are recognized now.

My fix throws a "invalid zip or broken" if it fails to find the header 
signature.

Cheers and continue your good work

Jörg