At Mon, 18 Oct 2010 18:43:59 +0200 (CEST),
Vincent Torri wrote:
> On Mon, 18 Oct 2010, Raphael Kubo da Costa wrote:
> 
> > At Sun, 17 Oct 2010 22:49:16 +0900,
> > Carsten Haitzler (The Rasterman) wrote:
> >>
> >> On Sun, 17 Oct 2010 07:51:14 -0200 Raphael Kubo da Costa 
> >> <k...@profusion.mobi>
> >> said:
> >>
> >>> At Sun, 17 Oct 2010 13:48:09 +0900,
> >>> Carsten Haitzler (The Rasterman) wrote:
> >>>>
> >>>> this is actually a good q... shouldnt it be unsigned long at any rate? 
> >>>> (tho
> >>>> to be honest int is probably enough... but as u have to send in 1 go... 
> >>>> 2gb
> >>>> might possibly be a limiting factor?)
> >>>
> >>> We have libcurl as a limiting factor anyway: values passed to
> >>> POSTFIELDSIZE will always be read as a long; additionally, a value of
> >>> -1 is used to tell libcurl we want it to calculate the size of our
> >>> POST fields with strlen().
> >>>
> >>> If you really want to send huge files via POST, there's a
> >>> POSTFIELDSIZE_LARGE option that reads a curl_off_t instead of a long
> >>> (with the same -1 twist). We can always use that instead of
> >>> POSTFIELDSIZE, however this means we'd need to accept a curl_off_t (or
> >>> an off_t) as a parameter type, which in turn takes us to my other
> >>> email about using void* in ecore_con_http_post_send :)
> >>
> >> hmm i don't much like this -1 for that. size of 0 makes more sense... as 
> >> such
> >> we shouldnt really care too much about curl's limits. on 64bit machines 
> >> this
> >> limit will be... bigger... if we make it a long (or unsigned long). as 
> >> such we
> >> need a way to give an error anyway - one error would be "too big". as such
> >> though this is pointing to this memory. we need to ACTUALLY fit this in
> >> accessible memory space. that means malloc it, put it on the stack or mmap 
> >> it
> >> directly from disk. in this regard long is probably fine. any limit curl 
> >> may
> >> have we should abstract. remember too this is a post of a file as a single 
> >> http
> >> command. sending it all as a single 2gb or even bigger lump is most... 
> >> well..
> >> odd, peculiar or at least unreliable. anything sending that kind of volume 
> >> of
> >> data likely would do it across many posts able to handle disconnects and
> >> re-sends etc.
> >
> > Sorry, I've kind of missed the point while reading your message ;)
> >
> > Are you saying we should use an unsigned long even though it will be
> > read as a long by curl, or that we shoulduse POSTFIELDSIZE_LARGE, or
> > that it's OK as it is?
> 
> on Windows 64 bits, long is of size 32 bits and not 64 bits. What about 
> using int64_t ?

We could do that, however when libcurl reads the value we pass to it
that value will be cast to a long anyway, no?

--
Raphael Kubo da Costa
ProFUSION embedded systems
http://profusion.mobi

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