Add support for StuffIt X JPEG compression

[ci-macpaw]

Originally reported on Google Code with ID 146

paracelsus:

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.

[ci-macpaw]

paracelsus:

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.

[ci-macpaw]

d235j.1:

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

[ci-macpaw]

d235j.1:

Maybe similar to http://en.wikipedia.org/wiki/JPEG#Lossless_further_compression ?