I plan to do this as an alias of bzcat, with changes required to create/overwrite/error on writing to file. Restoring the original file modes. As this is all that I need for the moment.
regards, Ashwini On Thu, Oct 16, 2014 at 4:38 PM, Rob Landley <r...@landley.net> wrote: > On 10/15/14 23:53, Ashwini Sharma wrote: > > Hi Rob, List, > > > > I was looking into 'bzcat' code. > > Can't this be used as bunzip2 or as __base__ to bunzip2, as I am > > interested in > > bunzip2 utility. > > > > At a glance it looked to me that it can be used, please share your > opinion. > > Yes, it can. > > The only reason I haven't done so yet is busybox tar requires the gunzip > and bunzip it uses to be built-in, so I can't drop the decompression > utilities from the busybox config in aboriginal linux (my main test > harness for toybox) until I switch over to using toybox tar. > > Also, I need to implement the relevant compression-side utilities. I > have about 1/3 of a gzip compressor implemented here (got distracted > while researching when to do dictionary resets; nobody quite seems to > agree on that one), and I did half a bzip2 implementation ages ago (the > fiddly bit is that the string sorting algorithms in the original are > kind of magic and unexplained; it seems to get constant time out of a > somewhat arbitrary set of sorting algorithms which give up and fall back > to the next one after doing a certain amount of work, but I don't > understand how/why it's set up that way. I need to stare at it some more.) > > And then there's the whole "cleanup xz decompression, implement xz > compression" part to look forward to... > > If you want to do a proper bunzip wrapper, be my guest. I did bzcat to > prove the engine works and left the rest on the todo list. I have a note > that loopfiles() needs a replace mode so bunzip and sed -i and maybe > patch can share code, but I can clean that up later. (And I need test > suite code to check that "bunzip blah.bz2" fails when blah already > exists...) > > > Thanks, > > Ashwini > > Rob >
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