Does anyone know what compression algorithm is used in this file?

0x00 Compress Size

0x05 Size After Decompression

Any help, no matter how small, would be greatly appreciated by me.
EDIT:The compression algorithm of this file is the same as the .das file in Resident Evil 4 GameCube version.

Sengoku Basara 2.zip

Edited March 29, 20242 yr by Sadamekaze

On 3/29/2024 at 8:11 PM, Sadamekaze said:

Does anyone know what compression algorithm is used in this file?

0x00 Compress Size

0x05 Size After Decompression

Any help, no matter how small, would be greatly appreciated by me.
EDIT:The compression algorithm of this file is the same as the .das file in Resident Evil 4 GameCube version.

Sengoku Basara 2.zip 280.28 kB · 8 downloads

I don't know exactly what the compression method is. but last week I made a tool to decompress it. but to compress it back is a bit difficult. The solution is to replace the compression method with a more frequently used one, like the lz family maybe, I use lz01x to compress back in my edited sb2h, it works well.

SB2H_DEC.zip

On 5/5/2024 at 12:05 PM, Gil_Unx said:

I don't know exactly what the compression method is. but last week I made a tool to decompress it. but to compress it back is a bit difficult. The solution is to replace the compression method with a more frequently used one, like the lz family maybe, I use lz01x to compress back in my edited sb2h, it works well.

SB2H_DEC.zip 17.5 kB · 6 downloads

Thank you very much for the tools and solutions.

On 5/5/2024 at 12:05 PM, Gil_Unx said:

I don't know exactly what the compression method is. but last week I made a tool to decompress it. but to compress it back is a bit difficult. The solution is to replace the compression method with a more frequently used one, like the lz family maybe, I use lz01x to compress back in my edited sb2h, it works well.

SB2H_DEC.zip 17.5 kB · 6 downloads

Sorry to bother you. Could you please send me the file that has been compressed using lz01x, for example?

2 hours ago, Sadamekaze said:

Sorry to bother you. Could you please send me the file that has been compressed using lz01x, for example?

What do you mean? It depends on what game you are editing, I edited Sengoku Basara 2 Heroes, SLPM_668.48, you need to change the decompression routines in that file (I took the LZ01X decompressor from the Havest Moon STH game), and change all the compressed files to LZ01X, if you like. If you're interested in  modified this game  continue this chat in PM.

Edited May 6, 20242 yr by Gil_Unx

11 minutes ago, Gil_Unx said:

What do you mean? It depends on what game you are editing, I edited Sengoku Basara 2 Heroes, SLPM_668.48, you need to change the decompression routines in that file (I took the LZ01X decompressor from the Havest Moon STH game), and change all the compressed files to LZ01X, if you like. If you're interested, I can send you the application and the files I edited.

Can you send it and how to change the decompression routine of SLPM_668.48? I'm really confused about this game compression issue. Thank you so much for helping me.

On 5/5/2024 at 11:05 AM, Gil_Unx said:

I don't know exactly what the compression method is. but last week I made a tool to decompress it. but to compress it back is a bit difficult. The solution is to replace the compression method with a more frequently used one, like the lz family maybe, I use lz01x to compress back in my edited sb2h, it works well.

SB2H_DEC.zip

Sorry, but this tool cannot be used to unpack the "msg.pack" file. I not sure if this script is useful, but when I tested it, it worked to unpack the "msg.pack" file and generate .dat files. msg pack Unpacker.py

sub_file_000.rar

Edited July 19Jul 19 by Jinxmargo

This looks like Capcom's YZ2 compressor. Kind of like LZ compression, but it uses Capcom's own dictionary and range coding system.

I only downloaded the ISO (SLPM_66447) as I needed to figure out how the compressor worked. I have no idea if the recompressed file will actually work in the game. I will leave that for you to figure out.

# Decompress
python .\YZ2.py .\msg.pack .\msg.fpk

# Compress
python .\YZ2.py --compress .\msg.fpk .\msg.pack

There also seems to be a #fpk archive in the decompressed output, but that is beyond the scope of this script. I could take a look at that, if needed.

YZ2.py

Edited yesterday at 06:01 AM1 day by Falkrian
Spelling

8 hours ago, Falkrian said:

This looks like Capcom's YZ2 compressor. Kind of like LZ compression, but it uses Capcom's own dictionary and range coding system.

I only downloaded the ISO (SLPM_66447) as I needed to figure out how the compressor worked. I have no idea if the recompressed file will actually work in the game. I will leave that for you to figure out.

# Decompress
python .\YZ2.py .\msg.pack .\msg.fpk

# Compress
python .\YZ2.py --compress .\msg.fpk .\msg.pack

There also seems to be a #fpk archive in the decompressed output, but that is beyond the scope of this script. I could take a look at that, if needed.

YZ2.py

I using the ISO (SLPM668.48).

2 minutes ago, Jinxmargo said:

~ Snip ~

Hey,

Have you tried to decompress and/or recompress to see if it works or not?

I went with SLPM_66447 because I assumed that is what the topic author is using judging by the screenshot. Could I ask you to share a *.pack file from SLPM_66848 or at least some file that has the compression? I will try to get my hands on SLPM_66848 myself and see if there is any difference.

---

UPDATE #1

I have managed to get my hands on SLPM_66848 and can confirm that there was only one minor change to Capcom's YZ2 compressor. I have managed to extract msg.pack from LINKDATA.AFS and decompressed/recompressed the file with the slightly modified script. The original file and recompressed file are identical.

YZ2.py

Edited yesterday at 03:41 PM1 day by Falkrian

18 hours ago, Falkrian said:

Hey,

Have you tried to decompress and/or recompress to see if it works or not?

I went with SLPM_66447 because I assumed that is what the topic author is using judging by the screenshot. Could I ask you to share a *.pack file from SLPM_66848 or at least some file that has the compression? I will try to get my hands on SLPM_66848 myself and see if there is any difference.

---

UPDATE #1

I have managed to get my hands on SLPM_66848 and can confirm that there was only one minor change to Capcom's YZ2 compressor. I have managed to extract msg.pack from LINKDATA.AFS and decompressed/recompressed the file with the slightly modified script. The original file and recompressed file are identical.

YZ2.py

Where you can get the file "msg.fpk" I can't find it

Edited 11 hours ago11 hr by Jinxmargo

You need to extract msg.pack from LINKDATA.AFS and then decompress with the attached python script to get msg.fpk.

python .\YZ2.py .\msg.pack .\msg.fpk

Edited 10 hours ago10 hr by Falkrian
Grammar

30 minutes ago, Falkrian said:

You need to extract msg.pack from LINKDATA.AFS and then decompress with the attached python script to get msg.fpk.

python .\YZ2.py .\msg.pack .\msg.fpk

I managed to decompress it. Can you check this file?msg.rar

Edited 9 hours ago9 hr by Jinxmargo

I have checked the files you've uploaded. Our files are pretty much identical. I also extracted the files after figuring out the FPK archive format. 👍

I have completed what I set out to do here. The OP wanted to know the compression used and two years later he/she finally received the answer, heh.

I have no idea what your goals are but I sincerely hope you will achieve them. Good luck!

MSG_FPK_Extracted.7z

Edited 8 hours ago8 hr by Falkrian
Attached extracted files

1 hour ago, Falkrian said:

I have checked the files you've uploaded. Our files are pretty much identical. I also extracted the files after figuring out the FPK archive format. 👍

I have completed what I set out to do here. The OP wanted to know the compression used and two years later he/she finally received the answer, heh.

I have no idea what your goals are but I sincerely hope you will achieve them. Good luck!

MSG_FPK_Extracted.7z

I want to translate this game. Thanks for your help.

4 hours ago, Jinxmargo said:

I want to translate this game. Thanks for your help.

I don't know the function of this file.

https://docs.google.com/spreadsheets/u/0/d/1KjeKed67OZX2e39cFMlTmvie0qvrVFD2atiXyYQZ0vw/htmlview#gid=993223486

Edited 2 hours ago2 hr by Lord Buggy