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Mysticus, posted Sat Aug 15, 2020 5:00 pm (58087)

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Does anybody of you know some program or script to extract this assets.pka file from Trails of Cold Steel 3?
I tried with the ToCS script of Luigi but I ended up with the big dat file.
Also the script doesn't work well with pkg files.
I need help please.

aluigi, posted Mon Aug 17, 2020 10:27 am (58114)

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The parts of the table containing offset and size of the files are encrypted.
The demo of the game doesn't use encryption.
I don't think I can do anything but I will keep you update if I have news.

Ekey, posted Mon Aug 17, 2020 6:29 pm (58126)

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I'm not sure about encrypted values because they are repeated in the next table, it looks more like 2 hashes like MD5/SHA1. The second table has values more similar to toc.

I think it looks like this:
First table - filenames hashes
The second table - hashes toc

Example for first entry > asset_D3D11.xml :

We have a two values (hashes) after the file name in first table

Code:

17 3E BC 7E 83 09 36 69 F8 EA 57 0B 2C F6 DE 9E
97 02 C7 75 8F 97 2D 0A 5C F5 6C FE CF D5 7B FF

These hashes are also in the second table:

Code:

17 3E BC 7E 83 09 36 69 F8 EA 57 0B 2C F6 DE 9E
97 02 C7 75 8F 97 2D 0A 5C F5 6C FE CF D5 7B FF

And toc after them with structure (Int64, Int, Int, Int) (Offset, ZSize, Size, CompType)

Code:

30 3D A1 01 00 00 00 00 3D 04 00 00 EA 0F 00 00 04 00 00 00

The table is quite huge since the archive size is 20GB, therefore, the cutted piece on first post is not complete

I cut out 20mb - that's enough for research: https://www112.zippyshare.com/v/fWq9fBrL/file.html

Edited:

Code:

  if ( CompType & 1 )
  {
    Type = "LZSS";
  }
  else if ( CompType & 4 )
  {
    Type = "LZ4";
  }
  else if ( CompType & 8 )
  {
    Type = "LZMA";
  }
  else
  {
    Type = "none";
    if ( CompType & 0x10 )
      Type = "ZSTD";
  }

Edited2: I can confirm i was right



Offset
303DA10100000000 -> 27344176

ZSize
3D040000 -> 1085

Size
EA0F0000 -> 4074

Comtype -> 4 (LZ4)

Code:

aluigi, posted Mon Aug 17, 2020 8:45 pm (58127)

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Where is this second TOC?
In the sample there is only filename hashes.

*edit* ok it was in the part not available in the sample

aluigi, posted Mon Aug 17, 2020 9:30 pm (58128)

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http://aluigi.org/bms/legend_of_heroes3.bms

Ekey, posted Tue Aug 18, 2020 12:08 am (58130)

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Good job

Mysticus, posted Tue Aug 18, 2020 7:40 am (58153)

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Thank you very much for being so kind, Luigi!
I deeply owe you one.

aluigi, posted Thu Nov 19, 2020 12:03 pm (60429)

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I have a couple of questions about this game and the script I made:

1) are we sure the compression of Type & 1 is "lzss"?
In my original script of 2017 I used "nislzs" (with ZSIZE and SIZE repeated in the first 8 bytes)

2) the new script doesn't work with the PKG file provided by Mysticus in the first topic and those of the demo too.
So is the script supposed for the PKA files only?

aluigi, posted Thu Nov 19, 2020 1:01 pm (60438)

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I just checked on my own and I was right.
PKA and PKG are different.
And yes, it's nislzs.
I removed the script above and put everything in the following:
http://aluigi.org/bms/legend_of_heroes.bms