Kingsley G. Morse Jr. on 2005-03-13 09:36:37 -0800: > Package: rzip > Version: 2.0-2 > Severity: minor > Tags: sid
<snip> > What does compression level 0 do? > > Does compression level 0 skip the bzip2 stage? As I read the code (look for struct level in rzip.c), level 0 skips bzip2 compression and uses a more limited hash table for finding similar blocks than level 1. > If so, wouldn't compression level 0 permit it to > be used as a filter, which is vital for speeding > up network transfers by allowing simultaneous > compression, sending and decompression? You need to have the entire blob you want to compress before you may begin compressing it; the author has said that he does not envision making rzip act in the manner gzip and bzip2 do (e.g., through a pipe or with a stream) without significant work. The algorithms behind rsync and rzip are similar, though, so if you want a program that implements 'rzip'd file transfers' you should look at that. As far as having something like zlib which can be hooked into the kernel, I am sceptical. If you're interested in pursuing this, I suggest you contact the author. This report seems to be seeking information and not a bug fix; may I close it?
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