[OT] how to make a folder be a jar file

[Ralph DiMola]

Colin,

I ran into this a few years ago when I cracked open an epub and re-zipping /re-naming it back to .ePub. I believe it was either the type of compression selected or trailing nulls in the recompressed file(or both?). Are the sizes of the original compressed file the same as the uncompressed/recompressed file the same? I will look back at old emails to find out what exactly happened. 

Ralph DiMola
IT Director
Evergreen Information Services
rdimola at evergreeninfo.net

-----Original Message-----
From: use-livecode [mailto:use-livecode-bounces at lists.runrev.com] On Behalf Of Colin Holgate
Sent: Friday, May 29, 2015 4:14 PM
To: How to use LiveCode
Subject: [OT] how to make a folder be a jar file

I have a need to edit a single character in a class file inside a jar file. My steps are:

rename the file to .zip
expand it
use a hex editor to make the single character change compress the folder rename back to jar

The jar file I get is seen to be bad. If I leave out the class editing, and just rename, decompress, compress, rename, that’s enough for the jar to not work.

Anyone have some insights as to how to expand and archive a jar file, without breaking it?
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