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condemn, posted Wed Aug 10, 2022 2:28 pm (72953)

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Hi guys !

The game is Idle Huntress, the game archive containing .unity3d files is inside a 1GB .pak file

I've attached two samples from filecutter.

Any idea to extract the files ? Thanks !

Ekey, posted Wed Aug 10, 2022 4:56 pm (72956)

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Code:

# Idle Huntress (PAK) format
# script for QuickBMS http://quickbms.aluigi.org

idstring "MFS"
get DUMMY long
get VERSION byte
get FILES long

for i = 0 < FILES
   get NSIZE byte
   getdstring NAME NSIZE
   get SIZE long
   get OFFSET longlong
   putarray 0 i NAME
   putarray 1 i SIZE
   putarray 2 i OFFSET
next i

savepos BASE_OFFSET

for i = 0 < FILES
   getarray NAME 0 i
   getarray SIZE 1 i
   getarray OFFSET 2 i
   math OFFSET  = BASE_OFFSET
   log NAME OFFSET SIZE
next i

condemn, posted Wed Aug 10, 2022 6:24 pm (72957)

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Thank you so much !

It seems all the extracted .unity3d files have a double UnityFS header, which is fine because I just need to delete the first 14 bytes to get AssetStudio to read them.

But since there are 9000 files, is there a way or script to delete the first UnityFS header ?

rabatini, posted Wed Aug 10, 2022 6:40 pm (72960)

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condemn wrote:

Thank you so much !

It seems all the extracted .unity3d files have a double UnityFS header, which is fine because I just need to delete the first 14 bytes to get AssetStudio to read them.

But since there are 9000 files, is there a way or script to delete the first UnityFS header ?

put

Code:

xmath offset "(offset   0x0e)"
xmath size "(size - 0x0e)"

before

Code:

log NAME OFFSET SIZE

condemn, posted Wed Aug 10, 2022 7:23 pm (72961)

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Thanks !

I haven't tested yet because I opened more files in Hex editor just to see some don't have double UnityFS header or some have it the engine version which would not work with the script ?

here is a screenshot from 3 different files



Checking each file for potential different header will take a long time..

spiritovod, posted Wed Aug 10, 2022 8:31 pm (72962)

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You need this instead of "log NAME OFFSET SIZE":

Code:

log MEMORY_FILE OFFSET SIZE
get DUMMY byte MEMORY_FILE
findloc BEGIN string "UnityFS" MEMORY_FILE ""
math SIZE - BEGIN
log NAME BEGIN SIZE MEMORY_FILE

condemn, posted Wed Aug 10, 2022 8:42 pm (72963)

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It works perfectly, thanks to the three of you !

Again, thanks for your time.

rabatini, posted Wed Aug 10, 2022 8:48 pm (72964)

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condemn wrote:

It works perfectly, thanks to the three of you !

Again, thanks for your time.

Now you have 2 modification that do the same thing lol, pick one.

i am not expert in unity stuff, but i managed to open in assetstudio.

regards.