On Thu, 10 Nov 2016, Johan Uppman wrote:
I just recently created a simple function for uploading files to a HTTP
server using libcurl and noticed a strange behavior when I used the
CURLOPT_RESUME_FROM/CURLOPT_RESUME_FROM_LARGE. I will try to explain the
situation and behavior below.
...
Thus if no seek function is specified libcurl will simply reduce the number
of bytes to read and read them from the beginning of the file. Should not
the proper behavior be to fallback to the "readuntil" method if not seek
function is specified or possible to indicate an error, not silently go
ahead and upload the wrong bytes?
That does indeed sound like a reasonable thing to do.
Just note that resumed uploads are not a defined thing in HTTP. Ie it won't
work univerally and thus this is a fairly unused code path, which could
explain why nobody else has fixed/reported it before.
Did you try to adjust the code and see if it made your case work?
--
/ daniel.haxx.se
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