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Re: Misc. enhancements

From: David Remahl <david_at_ittpoi.com>
Date: Tue, 29 Jul 2003 10:44:56 +0200

Hi Dan!

I just wanted to make sure that you know of a Cocoa wrapper for curl,
called CURLHandle. It is at http://curlhandle.sf.net/ and was made by
the creators of Watson.

/ Rgds, David

On tisdag 29 juli 2003, at 04.31AM, Daniel Noguerol wrote:

> Hello everyone,
>
> First off, let me say that libcurl is a very nice project and I hope
> everyone keeps up the great work being done.
>
> I am the author of Download Wizard, a Cocoa-based download manager for
> Mac OS X. I had already written the program's core network library
> (HTTP, FTP, Hotline) from scratch. I was in the process of researching
> HTTPS and FTPS support when I came across libcurl. Since its license
> allows use in commercial products and it already supported those
> protocols (as well as some others), I figured I'd put together a
> prototype of Download Wizard utilizing libcurl for both HTTP and FTP.
> This has been for the most part successful, but I had to make some
> changes to libcurl to get it behaving the way I need it to. I figured
> I'd share my experience and explain both the problems and how I chose
> to solve them. If anyone knows a better way to do these things, please
> let me know. Also, if my changes are something that might be desirable
> in the libcurl codebase, I'd be happy to share :)
>
> 1. There was no way to determine if a file on an FTP server was
> resumable. I determine if an HTTP server supports resumes by checking
> for the "Accepts-range: bytes" header (is there a better way?). My
> solution for FTP was, in the case of the user selecting the NOBODY and
> HEADER options, I send a "REST 0" after the "SIZE" command is sent. If
> I get a 350 code back, then I assume the server supports the REST
> command and return an "Accept-ranges: bytes" header in the same manner
> as is already done with "Content-Length:".
>
> 2. You can set a cookie string on an HTTP URL, but if CURL is
> redirected, even if it's on the same server, the second request won't
> include the cookies. My program supports cookies from multiple
> browsers, so pointing it at a cookie file wasn't feasible. My solution
> was to implement a "cookie callback" function in the same manner as
> the existing password callback. This callback is called if the
> CURLOPT_COOKIE option isn't set and is passed the current working URL
> as well as a buffer to copy the cookie string into.
>
> 3. I couldn't find any sort of function to externally tell CURL to
> stop downloading a file. This obviously isn't necessary for the
> command-line utility, but is needed for my GUI. In got this working by
> setting up a progress function callback and returning a 1 from that if
> the user clicked the stop button. This seems to do the trick but I
> imagine there would be some sort of performance penalty for installing
> the progress function. Is there perhaps a better way to do this?
>
> 4. I see an option to set a lower speed limit for transfers, but what
> about an upper one? Does this exist or has it been discussed?
>
> Anyhow, I'd welcome any feedback and be happy to share my code changes
> if anyone wants them.
>
> Thanks!
>
> ->Dan

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Received on 2003-07-29

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