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added on the 2025-11-08 16:20:43 by leonard  |
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Thank you Leonard!
rulez added on the 2025-11-08 17:32:39 by Depeche 
L-Packer is a new Atari & Amiga executable compressor! Optimized for 64K-style demos, it balances high compression ratios with decent decompression speed. To sum up it stands right in the middle between Shrinkler and Cranker/UPX. Currently support both inflate & ZX0 algorithms. More technical details here: https://github.com/arnaud-carre/L-Packer
Testing & feedback are welcome!
Testing & feedback are welcome!
Nice work
Thanks. Here is the mandatory thumb up!
Cool
Super!
Yep
Nice !
So I tested it for my 3 intros :
original shrinkler l-packer
Yes! 134248 60984 66968
The pixalated world 163220 64196 70524
Magical OCS 147596 61856 67808
It's a little over 64kb, but not by much, so it can probably be improved.
The problem is that the exe files no longer work: I get a crash while the cursor is flashing.
The three intros are in Amos, so they have a similar structure.
If you want, I can provide you with the uncompressed exe files.
So I tested it for my 3 intros :
original shrinkler l-packer
Yes! 134248 60984 66968
The pixalated world 163220 64196 70524
Magical OCS 147596 61856 67808
It's a little over 64kb, but not by much, so it can probably be improved.
The problem is that the exe files no longer work: I get a crash while the cursor is flashing.
The three intros are in Amos, so they have a similar structure.
If you want, I can provide you with the uncompressed exe files.
Nice to have a new packer for Amiga. Tested with no particular problem here. I'm waiting for the no-flash option :)
nice one !
Quote:
Nice ! It's a little over 64kb, but not by much, so it can probably be improved.
Yes, nothing could beat arithmetic coder of shrinkler (or STrinkler on atari). L-Packer is made when you can't afford too long depacking time with large exe such as 64KiB or more. So it's expected to be bigger than shrinkler, but should be smaller than any other amiga exe packers ( I hope :) )
Quote:
The three intros are in Amos, so they have a similar structure. If you want, I can provide you with the uncompressed exe files.
Yes I know Amiga bootstrap is not fully compatible right now (doesn't work with C compiled stuff). Probably same issue with AMOS exe. I have to investigate that for future v1.0. Ok you can provide an uncompressed AMOS exe so I can have a look
Quote:
I'm waiting for the no-flash option :)
I just added the option, please download again :)
Hey! This cruncher is great, but it would be even better if there was a Linux version (like there are Linux versions of Shrinkler and Cranker).
Just think about that, Leonard. :]
Just think about that, Leonard. :]
Definitely fills a - left empty for too long - space. Depacking time is very fast.
@leonard
Post in the eab forum thread
Post in the eab forum thread
just updated to v0.92. Now Amiga version also supports depack-in-place
This sounds great - quick(er) depack time, good ratio, muli-algo, working in-place. Surely will test it with the next prod. Thank you for releasing it to public, respect!
fast and tight packing
+1 for continuing to mess with packers :)
Some remarks and questions, summary:
- Shrinkler depack time is overstated by (at least) 15%
- Licensing
- Charts, I love charts:
- Including shrinkler file size in the chart
- Including depack time in the chart
- Including depacker disk overhead in bytes for Amiga and Atari
- Including depacker mem overhead in bytes for Amiga and Atari
- Including the pareto front, a simple log log chart with:
- X axis speed (KB/s) vs Y axis size (bytes)
It would be nice to see some more algorithms (Titanics, PowerPacker, PackFire, Doynamite, lha) in the charts.
Can you clarify how does the license apply to code packed with L-Packer? Do you have expectations of being credited in the prods using it?
As far as shrinkler goes, Shrinkler decompression routine does around 350 clocks per compressed bit on an Amiga 500. With standard 2bpl hires DMA interference, we're looking at around 2.5KB/s, so 26 seconds, unless you are having something like 1000 relocs in your hunks (but why do that in a 64k intro?). Probably more than 10% faster on Atari ST, so 23 seconds, but I don't know Atari..
If you have a 64k file that takes 30 secs with shrinkler, please lmk, I'd love to take a look at it..
Thanks for continuing to innovate, I love seeing your work pop up everywhere :)
Some remarks and questions, summary:
- Shrinkler depack time is overstated by (at least) 15%
- Licensing
- Charts, I love charts:
- Including shrinkler file size in the chart
- Including depack time in the chart
- Including depacker disk overhead in bytes for Amiga and Atari
- Including depacker mem overhead in bytes for Amiga and Atari
- Including the pareto front, a simple log log chart with:
- X axis speed (KB/s) vs Y axis size (bytes)
It would be nice to see some more algorithms (Titanics, PowerPacker, PackFire, Doynamite, lha) in the charts.
Can you clarify how does the license apply to code packed with L-Packer? Do you have expectations of being credited in the prods using it?
As far as shrinkler goes, Shrinkler decompression routine does around 350 clocks per compressed bit on an Amiga 500. With standard 2bpl hires DMA interference, we're looking at around 2.5KB/s, so 26 seconds, unless you are having something like 1000 relocs in your hunks (but why do that in a 64k intro?). Probably more than 10% faster on Atari ST, so 23 seconds, but I don't know Atari..
If you have a 64k file that takes 30 secs with shrinkler, please lmk, I'd love to take a look at it..
Thanks for continuing to innovate, I love seeing your work pop up everywhere :)
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