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Jul - General Game/ROM Hacking - NDS Rom Decompression/Recompression New poll - New thread - New reply
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origamiguy
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Posted on 11-08-09 03:25:00 PM Link | Quote
I am looking for some code snippets for NDS rom decompression/recompression/extraction/insertion, preferably in C# although i can do some VB as well.

Any help would be greatly appreciated (Treeki, i'm looking at you....).

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messiaen
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Posted on 11-08-09 07:44:16 PM Link | Quote
NSMB editor source.
origamiguy
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Posted on 11-08-09 08:56:17 PM Link | Quote
a few questions:
Is it possible to create a .nds file from a filesystem on a computer?
How does a .nds file define the folder structure and the offsets to each file?
Where are the Icon, Name, and Developer details stored?


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NASA spent $12 billion making pens that work upside down and in zero gravity. The Russians used pencils.
dirbaio
For future reference, "Responsible disclosure" isn't "acting like a douche about an exploit and demanding compensation".
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Posted on 11-09-09 06:32:37 PM Link | Quote
http://nocash.emubase.de/gbatek.htm

(under ds cartridges/encription/firmware)

Look at the NDS Cartridge header. It specifies offsets for the binaries and the file system tables.
Look at NitroROM file system to see how the file system works.
origamiguy
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Posted on 11-09-09 10:41:41 PM Link | Quote

Wow.
Thanks!

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NASA spent $12 billion making pens that work upside down and in zero gravity. The Russians used pencils.
dirbaio
For future reference, "Responsible disclosure" isn't "acting like a douche about an exploit and demanding compensation".
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Posted on 11-10-09 07:09:11 PM Link | Quote
hmm i forgot to tell you this:

Files in the filesystem have a name but also an ID. Some games use the name to load files and others use the ID (like NSMB). There are tools that let you decompress the whole filesystem and then compress it back, but they dont keep the original file ids, so the games that load the file ids wont work with that method.

And another thing: Some games use LZ77 compression to compress files, usually graphics or 3d data... You can have a loook at the source of NSMBEditor for code to compress/decompress it, i think in FileSystem.cs

good luck
origamiguy
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Posted on 11-10-09 08:09:46 PM (last edited by origamiguy at 11-10-09 05:13 PM) Link | Quote
Originally posted by dirbaio
Files in the filesystem have a name but also an ID. .... There are tools that let you decompress the whole filesystem and then compress it back, but they dont keep the original file ids...


I have made note of this, my program will create a "project" file, which keeps track of every file and the associated ID number.

I have written code to extract the ENTIRE file-system to a location on the hard-drive.
I also wrote code to extract the game's icon completely by myself, simply by reading that (incredibly useful) documentation and poking around in a hex editor.

Also, some advice to anyone doing this kind of thing:
If you're gonna use hex and decimal in the same program, make sure you don't get them confused. I accidentally read 20 bytes when I actually wanted 32 (20 in hex, notated as 0x20 or 20h), and broke the whole program.

[/rant]

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Jul - General Game/ROM Hacking - NDS Rom Decompression/Recompression New poll - New thread - New reply


Rusted Logic

Acmlmboard - commit 47be4dc [2021-08-23]
©2000-2022 Acmlm, Xkeeper, Kaito Sinclaire, et al.

29 database queries, 3 query cache hits.
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