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Bitbreaker
Registered: Oct 2002
Posts: 508 |
Doynamite 1.x
Hi Folx,
after doynamite was used in some recent productions and people often stumbled over the .prg/.bin pitfall i decided to make some improvements to the packer, it can now spit out a sfx, level-packed data including a valid load-address and depack-address, as well as forward literals to keep the safety margin low. Raw data can still be loaded and output without any bytes added. Also the optimal bitlengths can be iterated now and the optimal table be glued to the output file.
I also happend to make a leaner version that lets the files get slightly bigger, but shrinks the depacker to $e0 bytes and makes depacking 5-10% faster. This might be of good use for demo systems where size matters a lot.
Any more things one could wish? |
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WVL
Registered: Mar 2002
Posts: 902 |
Score \o/ |
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ChristopherJam
Registered: Aug 2004
Posts: 1409 |
Yes, well done!
All I can say in my defence is my decoder's even smaller than yours ;) |
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Bitbreaker
Registered: Oct 2002
Posts: 508 |
A bad ratio still spoils the fun, no matter how fast and tiny the depackers get. Here's some benchmark results for loading + depacking the first side (well most of, not those 2 going under IO) of CL13:
bb hclfix $0ac4
lzwvl $0a08
doynax $08a9
doynax_small $08e8
doynax_small loaddecomp $0749
So the additional loading overhead kills all the speed advantage. Loading and decompressing in one go gives the best results, but bloats the code a lot. The spindle system suffers from the same problem, a bad ratio due to having references in only one block. It feels still fast though and i get testfiles loaded around the same speed as with loaddecomp (is there a framecounter available in spindle to proof the feeling?) |
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HCL
Registered: Feb 2003
Posts: 728 |
Thanx, now i will not waste my time ;). *this* will not keep me from winning any compo in the future, though perhaps other things will :P. |
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enthusi
Registered: May 2004
Posts: 677 |
I get the feeling that it really doesnt matter much :)
Rather for crackers and onefilers or one-siders maybe? :) |
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ChristopherJam
Registered: Aug 2004
Posts: 1409 |
Well, the main reason I was optimising for decoder size with tinycrunch was because that was all I had room for once the demo was decoded. It's admittedly a fairly special case, it's not often I'm scraping for every last fraction of a page.
Even the music data was interleaved into unused fragments of the character definitions (only 5 bytes of every 8 were visible).
Agreed that total time for load+decrunch is usually more significant, except in cases where you can background load into some free space, but then need to quickly decrunch between ending one part and starting the next. |
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