On Thu, 7 Aug 2025, Yoshimasa Ohno via curl-library wrote:
In the application, I am trying to specify the retrieval range in
CURLOPT_RANGE and write incoming data through CURLOPT_WRITEFUNCTION.
As far as I can tell, the callback to CURLOPT_WRITEFUNCTION doesn't seem to
pass over data outside the range specified by CURLOPT_RANGE. Is this a
coincidence? Or is it designed that way?
It is designed that way. You ask for a range, you get that range.
Since the FTP protocol does not have a range specification (end-of-range
specification) mechanism, we expect that the libcurl side is designed to
ignore out-of-range data.
curl makes sure to deliver what the user asks for! FTP has a command to
instruct the server where to start reading from, and then curl stops reading
at the end of the range. Easy peacy!
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/ daniel.haxx.se || https://rock-solid.curl.dev
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