[OT] PerlIO::gzip or Tie::Gzip?

Nicholas Clark nick at ccl4.org
Wed Feb 6 23:05:26 GMT 2008

On Wed, Feb 06, 2008 at 01:58:00PM -0800, John Costello wrote:
> I was about to install PerlIO::gzip when I encountered this in the README:
> 	**DON'T** trust it with your data.
> The data isn't critical - I'm parsing mail logs - but should be accurate.
> Tie::Gzip has the disadvantage of not warning doom, and has a few
> interesting features.
> I'm curious whether there are strong feelings either way, and whether 
> Nicholas' warning is akin to someone saying, "Here's a chef's knife.  
> Don't slice off your hand."

Well, maybe I should remove that warning. It's mostly that I'm not aware
that it's been battle tested enough to be confident that it doesn't have
bugs, and it is the sort of thing where bugs could be data loss bugs, and
could be silent data loss bugs. As in, "oops, this file we compressed isn't
readable any more"

I've personally not been using it, but I don't have a need. It was more
written because I could. It's also why there's been no drive to work out
what it might do better to cope with threads. (Specifically, what to do if
someone clones a thread while a file handle has a PerlIO::gzip layer pushed
onto it)

PerlIO::gzip may well be faster (it is pure C, after all, avoiding the tie
interface) but it doesn't do much other than compress and uncompress data.

Nicholas Clark

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