[RELEASE] libLZR 0.11 - de- and encoding of LZR-compressed data

[BenHur]

This is the initial public release of libLZR - a small open source library that handles the decompression and encoding of LZR-compressed data. (LZR-compression is frequently encountered in PSP firmware resource files.) Download libLZR from here.

Decompression results of libLZR should be identical to Sonys internal decompression algorithm. Please report incompatible streams to me.

Compression in libLZR currently does not actually compress the data, but only produces a valid LZR stream. I'm thinking about implementing real compression, but - since it's not easy - I ask myself: Are there applications, where an LZR-compressor is needed? Would you have a use for LZR-compressed streams?

Cheers, BenHur

[a_noob]

It could be useful, however there is already gzip which is implemented by sony in the FW and requires no additional library. There probably is LZR too which would just need some decoding. But since gzip is soo widely common and available I do not think you need to waste time writing a LZR compressor, unless you would like a good learning experience in compression algorithms.

[BenHur]

Originally Posted by a_noob

It could be useful, however there is already gzip which is implemented by sony in the FW and requires no additional library. There probably is LZR too which would just need some decoding. But since gzip is soo widely common and available I do not think you need to waste time writing a LZR compressor, unless you would like a good learning experience in compression algorithms.

Thanks for the feedback. I had my learning experience with reversing the LZR decompression, so I'm good right now

About the applications of the compressor: it coud be used to modify data, where the firmware expects an LZR stream. E.g. to change the look-up tables for codepage conversion. Since this example doesn't make sense, I was looking for others...

But unless I know of an interesting application I'll work on other things.

Cheers, BenHur