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20 November 2010, 20:20
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#1 |
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Junior Member
Join Date: Dec 2002
Location: The Streets
Age: 39
Posts: 2,731
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Trouble decrunching specific data in Shadow Fighter AGA
Whereas the ECS version makes it easy to find the crunched part of the disk holding the protection screen data, the AGA version seems to make it damn near impossible.
I've attached the ripped part of the disk I'm having trouble with. The ECS version has something similar to this (crunched file inside another crunched file) but at least you can take it out and ProPack and xfdDecrunch will still be able to unpack it afterwards without a problem. With the AGA version, no matter how much of the file I rip out from 'RNC' onwards (and there's only one instance of 'RNC' inside said file), both apps will report that the data is corrupt and refuse to unpack it. I even tried just ripping from 'RNC' to the very end of the file and I still get the same problem. Is this thing designed to be unpacked or not? Or is the game just well protected and it uses a custom/proprietary unpacker to get around it? It *has* to be accessible somehow - Prestige managed to crack the AGA version and have it skip the protection screen altogether, and it wasn't with a boot patch either! Note: I did try WRip but that can't seem to find the correct length either - doing WRip "file" xfdScan will rip a file named "ProP 8C8D 9621", but it can't be unpacked, as before. |
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21 November 2010, 14:13
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#2 |
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This cat is no more
Join Date: Dec 2004
Location: FRANCE
Age: 52
Posts: 8,162
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Just a hunch: file is 300Kb but winzip shrinks it down to 80Kb: my guess is that this is not a packed file or winzip could not have been done a lot better than RN packer.
You (and wrip) could have mistaken decruncher code (with RNC\01 tag check) for a packed file header. |
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21 November 2010, 16:36
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#3 |
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Junior Member
Join Date: Aug 2001
Location: France
Posts: 1,385
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it could be the decrunch routine and not a packed file
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21 November 2010, 18:56
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#4 |
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Junior Member
Join Date: Dec 2002
Location: The Streets
Age: 39
Posts: 2,731
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JOTD: It's not the whole file itself that needs decrunching - it *was* crunched before, but I unpacked it before upping it here. What I'm talking about is the smaller RNC block inside the file that I'm having trouble ripping. Nothing seems to be able to find the end part of it.
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22 November 2010, 22:34
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#5 |
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2 contact me: email only!
Join Date: May 2001
Location: Auckland / New Zealand
Posts: 3,182
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As JOTD and Frog have just said, it's probably the RNC decrunch routine in the file!
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23 November 2010, 01:45
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#6 |
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Junior Member
Join Date: Dec 2002
Location: The Streets
Age: 39
Posts: 2,731
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So.......... telling the difference between an RNC header and an RNC decrunch routine is another thing I have to learn, I take it?
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23 November 2010, 03:07
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#7 |
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2 contact me: email only!
Join Date: May 2001
Location: Auckland / New Zealand
Posts: 3,182
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Yes, but it's easy. If it's a packed file, you will have the RNC header (one long), then the crunched length (one long) and the decrunched length (one long). (Maybe swapped around, I'm going from memory).
If it's the decrunch routine, you will see code rather than "random" junk. |
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