LZMA is a relatively new compression algorithm. It is used in more and more places: 7-zip, the Linux kernel and deb and RPM packages. So adding LZMA to Strigi was a desirable step. The code for LZMA can be downloaded from the 7-zip website. It is in the public domain.
For decompression, only 3 c files are required. I’ve
added these to the Strigi repository directly. The decompression
interface of LZMA is similar to that of GZip and BZip2. It nevertheless
cost me quite a bit of time to figure out how to use it exactly. The
result is a Strigi::InputStream class that can be used
in the same way as the other decompression classes.
Once the InputStream was written, adding LZMA support to
.deb files, .rpm files and jstream:/
was simple.
This improvement, along with a better index, will be released in Strigi 0.6.4 this week.
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