LZ4 MOD for *certain* game's data archives | repacks

[L33THAK0R]

Originally Posted by FitGirl

LZ4 has been released only in 2011, it could not exist in Demon's Souls. If any LZ algo is used in there - it's something custom, like LZSS, Japanese devs love it.

Rats! I hadn't considered that, that begs the question how ztool was used in the repacks I mentioned to be able to pack these streams. It'll definitely be interesting to see if anyones able to figure this one out, but given how niche this hobby is, and more niche still with console game-data compression, I think this might just remain a mystery for a while longer!

[Masquerade]

Originally Posted by L33THAK0R

Rats! I hadn't considered that, that begs the question how ztool was used in the repacks I mentioned to be able to pack these streams. It'll definitely be interesting to see if anyones able to figure this one out, but given how niche this hobby is, and more niche still with console game-data compression, I think this might just remain a mystery for a while longer!

Well if you can see what plugin was used for ZTool, that might help you.

[L33THAK0R]

Originally Posted by Masquerade

Well if you can see what plugin was used for ZTool, that might help you.

All I was able to gather from the installer and testing the archives was that, at least for Gnarys repack of the title, "plz4" was used. I haven't been able to look at the Darack teams repack of it as no mirrors of it exist currently, but I theorise a similar method was used.

[FitGirl]

Originally Posted by L33THAK0R

Rats! I hadn't considered that, that begs the question how ztool was used in the repacks I mentioned to be able to pack these streams. It'll definitely be interesting to see if anyones able to figure this one out, but given how niche this hobby is, and more niche still with console game-data compression, I think this might just remain a mystery for a while longer!

It means those streams were picked up by detector wrongfully and it generated some delta for restoring non-existing streams. I bet packing the game w/o LZ4 precompression will give better result than with it.

Headerless LZ4s are very hard to detect, so many false streams are found. They even decompress, but are not real streams

Razor would tell you a whole book of such stories.

[L33THAK0R]

Originally Posted by FitGirl

It means those streams were picked up by detector wrongfully and it generated some delta for restoring non-existing streams.

Alright I think I understand the gist of this, I didn't realise this could happen, its quite interesting honestly.

Originally Posted by FitGirl

I bet packing the game w/o LZ4 precompression will give better result than with it.

I hope I'll be able to figure out how to squash the main data-files down, since it seems the title can be compressed a considerable amount.

Originally Posted by FitGirl

Headerless LZ4s are very hard to detect, so many false streams are found. They even decompress, but are not real streams

Thankfully I'm yet to encounter many titles that use this algorithm, fingers crossed one day I'll be equipped to handle such a monster!

Originally Posted by FitGirl

Razor would tell you a whole book of such stories.

If he ever comes back, I'd honestly love to hear more about this