Subj : Fmail Compression and Decompression
To   : Wilfred van Velzen
From : Michiel van der Vlist
Date : Mon Aug 21 2023 02:30 pm

Hello Wilfred,

On Sunday August 20 2023 16:50, you wrote to me:

MvdV>> I was thinking about allowing the user to define his own
MvdV>> compression method. A method that is not in the list (yet).
MvdV>> There is an option "Custom" but I am unsure how that works.

WV> Packing is simple, just use it...

Indeed..

WV> For unpacking you need some kind of detection mechanism.

That could be circumveneted by allowing the user to not only specify a compression method for outgoing mail but to als allow the user to specify a decompression method per node. To be used if autodetection fails.

Or let the user specify the "fingerprint" for a custom compression method. From what I remember it is enough to look at the first two bytes of a compressed file. Fingerprint for ZIP is "PK"

OTOH... It may not be worth the effort this late in the game...

WV> Which incase of FMail is left to the "General Unpack Shell". Which is
WV> fed everything that is unknown to FMail itself...

GUS... I never used it myself, never had a need for it. It is still under development or is it abandonware like so many other FTN stuff?


Cheers, Michiel

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