Message 185835 - Python tracker

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Author	pitrou
Recipients	christian.heimes, pitrou
Date	2013-04-02.13:23:35
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1364909015.82.0.0760723886219.issue17618@psf.upfronthosting.co.za>
In-reply-to

Content
Base85 encoding (see e.g. http://en.wikipedia.org/wiki/Ascii85 ) allows a tighter encoding than Base64: it has a 5/4 expansion ratio, rather than 4/3. It is used in Mercurial, git, and there's another variant that's used by Adobe in the PDF format. It would be nice to have a Base85 implementation in either the binascii or base64 modules. (unfortunately the Mercurial implementation is GPL'ed, although if we want to copy it we might simply ask them for a relicensing)

Base85 encoding (see e.g. http://en.wikipedia.org/wiki/Ascii85 ) allows a tighter encoding than Base64: it has a 5/4 expansion ratio, rather than 4/3.
It is used in Mercurial, git, and there's another variant that's used by Adobe in the PDF format.

It would be nice to have a Base85 implementation in either the binascii or base64 modules.

(unfortunately the Mercurial implementation is GPL'ed, although if we want to copy it we might simply ask them for a relicensing)

History
Date	User	Action	Args
2013-04-02 13:23:35	pitrou	set	recipients: + pitrou, christian.heimes
2013-04-02 13:23:35	pitrou	set	messageid: <1364909015.82.0.0760723886219.issue17618@psf.upfronthosting.co.za>
2013-04-02 13:23:35	pitrou	link	issue17618 messages
2013-04-02 13:23:35	pitrou	create