Re: Question: estimating size of a buffer when written to file?

[Stefan Monnier <monnier@iro.umontreal.ca>]

> Is there any reliable way to get (or conservatively estimate) 
> the size of a buffer when written to file?

How 'bout your first encode the buffer's content and then write it
instead of relying on the write to do the encoding?
This way you get to see the size trivially.

If you need this estimate faster (e.g. because you may end up not
writing the text at all depending on the result), then I think the only
way is to multiply the number of chars by the amplification factor that
is a property of the encoding (this is used in the C to allocate
a destination byte-array that's guaranteed to be large enough.  Not sure
if we currently expose it to ELisp but it would be easy to do).


        Stefan