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matiaz / theunarchiver

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Add support for StuffIt X JPEG compression #146

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
StuffIt X has a custom JPEG compressor. This one consists of huge amounts
of code, and I do not currently have the time to find out how it works.

Any help here would be appreciated.

Original issue reported on code.google.com by paracel...@gmail.com on 1 Feb 2009 at 8:53

GoogleCodeExporter commented 9 years ago 
Maybe similar to http://en.wikipedia.org/wiki/JPEG#Lossless_further_compression 
?

Original comment by d235...@gmail.com on 1 Oct 2010 at 5:38

GoogleCodeExporter commented 9 years ago 
This appears to be the patent for this compression format:
http://www.google.com/patents/US7502514
http://www.google.com/patents/EP1815398A2

Original comment by d235...@gmail.com on 3 Dec 2012 at 1:10

GoogleCodeExporter commented 9 years ago 
That does look like it's it.

Unfortunately, it doesn't seem detailed enough that you could use it to write a 
decompressor directly. However, it might be handy in combination with reverse 
engineering.

Also, it does look like it only covers compression, and not decompression, 
which would good.

Original comment by paracel...@gmail.com on 3 Dec 2012 at 1:17