[Standards] Binary data over XMPP

Michal 'vorner' Vaner vorner at ucw.cz
Wed Nov 7 18:00:34 UTC 2007


On Wed, Nov 07, 2007 at 04:11:21PM +0000, Dave Cridland wrote:
> On Wed Nov  7 15:02:57 2007, Michal 'vorner' Vaner wrote:
>> Can't compression solve this? Does anyone know, how the base64 encoded
>> data grow/shrink, if they are put trough zlib? Would be nice to know,
>> how far it is worth going with the blob transfers & modifications to
>> protocol.
> I've been accused - on this list - of treating compression as a panacea. 
> But it's not a substitute for efficiency. Base64 encoding is recovered to a 
> degree by a good minimal redundancy algorithm, but it tends to shield 
> patterns from a dictionary algorithm. DEFLATE uses a Lempel-Ziv dictionary 
> algorithm first, then Huffman, a minimal redundancy algorithm.

Sure it is not optimal. I was just wondering, how far we want to go in
solving it - how bug the problem is. I still think redefining XMMP from
the ground because of this is not the right way.

The problem with graduate students, in general, is that they have
to sleep every few days.

Michal 'vorner' Vaner
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