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arves100, posted Mon Dec 30, 2019 11:03 am (52899)

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Digimon Story Cyber Sleuth steam edition uses the file format MVGL for packing it's files.
In this situation, the MVGL files are XORed by two table that I was not able to dump correctly (it was also using the XMM registry if I remember correctly), I've decided to make a simple DLL that will decode this files, so could be unpacked.

I've attached a precompiled DLL and the source code (under GPLv3) in the 7zip archive.
Simply inject the DLL after the game has been started and follow the instructions in the console that has been spawned.

The following script made by chrrox will be able to decompressed the decoded files:

Code:

#Chaos Rings 3
#quickbms script by chrrox
#http://www.chaosrings.com/3/
comtype doboz
IDSTRING "MDB1"
get COUNT1 short
get COUNT2 short
get FILES long
get BASE long
get ARCHIVE_SIZE long

for i = 0 < COUNT1
   get UNK01 short
   get UNK02 short
   get UNK03 short
   get UNK04 short
   putarray 0 i UNK01
   putarray 1 i UNK02
   putarray 2 i UNK03
   putarray 3 i UNK04
next i

for i = 0 < COUNT2
   getdstring EXT 4
   getdstring NAME 0x3C
   putarray 4 i NAME
   putarray 5 i EXT
next i

for i = 0 < FILES
   get OFFSET long
   math OFFSET  = BASE
   get SIZE long
   get ZSIZE long
   putarray 6 i OFFSET
   putarray 7 i SIZE
   putarray 8 i ZSIZE
next i

for i = 0 < COUNT1
   getarray VAR1 1 i
   if VAR1 != 0xFFFF
      getarray NAME 4 i
      getarray EXT 5 i
      if EXT == "img "
          set EXT string "pvr"
      endif
      string NAME  = "."
      string NAME  = EXT
      getarray OFFSET 6 VAR1
      getarray SIZE   7 VAR1
      getarray ZSIZE  8 VAR1 
      if ZSIZE == SIZE
         log NAME OFFSET ZSIZE
      else
         clog NAME OFFSET ZSIZE SIZE
      endif
   endif
next i

MVGLDllDecoder_Release.7z

GabrielProudmore, posted Wed Jan 29, 2020 5:12 pm (53590)

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Ok, but how exactly works? I have put the extracted .rar data (.dll and all) on the same folder of the mvgl, but no console show up when the game start or anything.