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Hi,

Anyone aware of a compression format that is targeted (and ideally already implemented) for low end systems such as SMS and has a compressor available in java?

No, but it wouldn't be hard to port one, they're not that complicated. If you want cross platform, there's an aPLib compressor in Python.

That is my current go to option using Jython. A concern was the original author Jørgen Ibsen explicitly forbid the reverse engineering of the compressor in his licence so not where the python version sits. I might pop him an email.

I do very much like aPLib and you have done all the hard work for me (many thanks).

EDIT: I should mention. Looking for an alternative that is fully done in java. Doubt it exists but fishing.

i'd say there are some RLE java classes online.

Given the format spec it's not that hard to write a compressor. Well, it's a bit painful because it's hard to be optimal, but a simple implementation is OK. Maybe go for ZX7 if the aPLib restrictions worry you.

There are a set of compressors/decompressors in AspectEdit. I lost the source code a long time ago but feel free to run that through JD-GUI or something. Take a look in the aspectedit.io package. The LevelReader/Writer classes handle Sonic 2/Sonic Chaos level formats (RLE). TTLevelReader/Writer handles Sonic Triple Trouble level compression (an LZSS variant). CompressedTilesetReader/Writer handles the art compression.
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Author	Message
psidum Joined: 01 Jan 2014 Posts: 331	Java Based Compressor Posted: Sun Aug 06, 2017 10:15 pm
psidum Joined: 01 Jan 2014 Posts: 331	Hi, Anyone aware of a compression format that is targeted (and ideally already implemented) for low end systems such as SMS and has a compressor available in java?

Maxim Site Admin Joined: 19 Oct 1999 Posts: 14738 Location: London	Posted: Mon Aug 07, 2017 6:20 am
	No, but it wouldn't be hard to port one, they're not that complicated. If you want cross platform, there's an aPLib compressor in Python.

psidum Joined: 01 Jan 2014 Posts: 331	Posted: Mon Aug 07, 2017 8:10 am
psidum Joined: 01 Jan 2014 Posts: 331	That is my current go to option using Jython. A concern was the original author Jørgen Ibsen explicitly forbid the reverse engineering of the compressor in his licence so not where the python version sits. I might pop him an email. I do very much like aPLib and you have done all the hard work for me (many thanks). EDIT: I should mention. Looking for an alternative that is fully done in java. Doubt it exists but fishing.

vbt Joined: 21 May 2007 Posts: 161	Posted: Mon Aug 07, 2017 9:25 pm
vbt Joined: 21 May 2007 Posts: 161	i'd say there are some RLE java classes online.

Maxim Site Admin Joined: 19 Oct 1999 Posts: 14738 Location: London	Posted: Mon Aug 07, 2017 10:35 pm
	Given the format spec it's not that hard to write a compressor. Well, it's a bit painful because it's hard to be optimal, but a simple implementation is OK. Maybe go for ZX7 if the aPLib restrictions worry you.

Glitch Joined: 16 Dec 2008 Posts: 38 Location: UK	Posted: Wed Aug 09, 2017 7:23 pm
Glitch Joined: 16 Dec 2008 Posts: 38 Location: UK	There are a set of compressors/decompressors in AspectEdit. I lost the source code a long time ago but feel free to run that through JD-GUI or something. Take a look in the aspectedit.io package. The LevelReader/Writer classes handle Sonic 2/Sonic Chaos level formats (RLE). TTLevelReader/Writer handles Sonic Triple Trouble level compression (an LZSS variant). CompressedTilesetReader/Writer handles the art compression. [/url]

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