> But it's not!

I was basing my belief on what www.gzip.org paragraph about the files
over 4 Gb problem. It said :

----8>----8>----8>

Files already compressed without the patch are correct; the patch is
useful only for decompression. Decompression with zcat outputs the
correct data plus an error message length error that you can ignore
for a single file. For example you can decompress with

     gunzip < file.gz > file

zcat on multiple files will stop at the first error so use the patch
to avoid any problem.

----8>----8>----8>

But since our gzip already has the patch inside as it was said in
another message, this look weird.

The modulo idea is very good :)

As long our gzip files can be decompressed by gzip elsewhere it's ok I
guess >:>

--
unzip ; strip ; touch ; grep ; finger ; mount ; fsck ; more ; yes ;
fsck ; umount ; sleep