XeNTaX

rman2 wrote:here is a quickbms code I wrote to extract .bdae files from the actors.gla file.

Code: Select all

endian BIG
get UNK long
get START long
get BDAEOFFSET long
get FILES long
for i = 0 < FILES
get OFFSET long 
get SIZE long
get CURSET long
Math CURSET + BDAEOFFSET
savepos END 
goto CURSET
getdstring NAME 0x32
goto END
get UNK long


log NAME OFFSET SIZE
next i

the bdae files seem to contain the textures and 3ds max files, they have the header BRES.

rman2 wrote:I'll have a look at it but I'm new to this, this is the first thing I've ever written :s

GMMan wrote:I have a GLA extractor on hand with decryption implemented. I just disassembled the NOVA3 code, and it contains better code flow than what I derived from NOVA2, so I'll be tidying up the code a bit.

Note: for DDS files you need The Decompressonator to convert to a standard DDS.

GMMan wrote:I'm done tidying up my code, so it's time for a release. Attached you will find the extractor build, extractor source, and encryption algorithm source. This program is written in C#, with the encryption implemented in C++ because it's easier to deal with arbitrary amounts of bytes and shifting and what not in C++ than C#. Anyway, just drag and drop the .gla file over the extractor executable and it'll extract the files into a folder with the same name as the .gla file with "_extracted" appended to it. In the extractor is an implementation of CCustomPakFileReader, which is the pak reader used in Gameloft games. It's not identical (I'm too lazy to go try to emulate it exactly), but its methods should return more or less what you would expect from the corresponding methods in Gameloft's games. The extractor can be included as a referenced assembly if anyone wants to use it as a reader in their Gameloft game modding program.

A pak writer is not implemented, though a quick test with the ENCODE_XOR32 method seems to produce the correct encrypted files.

Please note there are many types of archives used by Gameloft games. There's one used for their older games (I have a quickly whipped up extractor called GameloftCrapEngineExtract, because the games made with their old engine are crap (Assassin's Creed: Altair's Chronicles, anybody?)), this one, scrambled ZIP (used in Asphalt 6 for audio, can be converted with a quick binary search and replace plus recovering byte patterns that has been mistakenly replaced in the process), and something using a different type of encryption that I haven't gotten to (also with .gla extension). Make sure you stick the right type of file into the extractor, or else it will choke and crash. This particular format is in big endian, 16 bytes of header, and the an array of 16 byte entries. You'll see a lot of zeros in the first kilobyte or so of the file. The last column of 4 bytes for entries is either 0 (no encryption) or 1 (encrypted). All file names are encrypted, but file data may or may not be encrypted. Note this program may not be compatible with .gla files that do not have file names encrypted.

For further study: Vox Native audio (Vox is the sound engine used in Glitch games, and the native format can specify effects, playlists, and segments while storing audio data in a big chunk), and Binary Collada (BDAE) models (tried once, very confusing; will try again with symbols, and hopefully it's easier).

Note: Pending posting to tools blog. Source code will be available there.

GMMan wrote:Download: blog/?p=659