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Re: When CURLOPT_RANGE is specified in the FTP protocol, does it ever write out-of-range data?
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From: Yoshimasa Ohno via curl-library <curl-library_at_lists.haxx.se>
Date: Fri, 8 Aug 2025 05:23:57 +0900
> FTP has a command to
instruct the server where to start reading from, and then curl stops reading
at the end of the range.
Thanks for the reply.
I see that curl will process to the specified RANGE before passing it to
WRITEFUNCTION.
I will implement it with that expectation.
2025年8月8日(金) 0:27 Daniel Stenberg <daniel_at_haxx.se>:
> 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!
>
> --
>
> / daniel.haxx.se || https://rock-solid.curl.dev
>
Date: Fri, 8 Aug 2025 05:23:57 +0900
> FTP has a command to
instruct the server where to start reading from, and then curl stops reading
at the end of the range.
Thanks for the reply.
I see that curl will process to the specified RANGE before passing it to
WRITEFUNCTION.
I will implement it with that expectation.
2025年8月8日(金) 0:27 Daniel Stenberg <daniel_at_haxx.se>:
> 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!
>
> --
>
> / daniel.haxx.se || https://rock-solid.curl.dev
>
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