[hytek1999]

Ok. This might not be directly related to Open Rails, but I know that some of the devs hang around here. I'm writing a replacement utility for TSUNPACK. I'm really starting to love mini-routes especially with the support that OR is giving them. But I really hate that I have to change my registry key every time I want to unpackage a new activity.

Anyway, I've got to the point where I can extract the files and even convert the APK to a ZIP file. But my question is this, all of the files have an extra 2 bytes (unicode) character at the end of them. I think this might be some sort of checksum, but I can't really tell for sure. Has any hacked the APK file and figured out what those are? I just think it might be nice for my utility to be able to package APK files as well as unpackage them and I'm pretty sure TSUNPACK will throw a fit if I don't get this right.

Thanks.

[engmod]

>I'm writing a replacement utility for TSUNPACK

Why not have a pop up screen so you can point to your mini route?

cheers

[James Ross]

hytek1999, on 24 October 2013 - 06:27 PM, said:

But my question is this, all of the files have an extra 2 bytes (unicode) character at the end of them. I think this might be some sort of checksum, but I can't really tell for sure. Has any hacked the APK file and figured out what those are? I just think it might be nice for my utility to be able to package APK files as well as unpackage them and I'm pretty sure TSUNPACK will throw a fit if I don't get this right.

I've not looked at one of these files in detail, but if it is a 2-byte checksum I'd say the most likely is the common CRC-16 (called "CRC-16-IBM" on http://en.wikipedia....edundancy_check).

As someone who's spent lots and lots of time breaking apart and reassembling file formats, I'd suggest you actually try leaving those two bytes as 0 and see what TSUNPACK does. It might crash or error out, in which case you know it needs something, but it might also completely ignore them. ;)

[conductorchris]

Boy, what a service you are doing. TSUnpack seems to be an endless source of problems and just plain doesn't work a good portion of the time (in Windows 7 even after changing the registry key).
thanks
Christopher

[hytek1999]

Good. I'm glad to hear there is an interest in it. I'm probably going to revisit the repackaging feature later. For now it is probably just better to keep it simple. If any one wants to check it out, I've got it hosted up on Google Code: https://code.google....-apk-extractor/

The code needs a few more comments and I'm sure there are issues that I haven't accounted for, but it works pretty well. I've put up a quick and dirty wiki entry to explains the basic usage of the utility. Hopefully it will be a help to some people.