Curl support RFC

[Jonas Drewsen]

Hi,

    So I've spent some time trying to wrap libcurl for D. There is a lot 
of things that you can do with libcurl which I did not know so I'm 
starting out small.

For now I've created all the declarations for the latest public curl C 
api. I have put that in the etc.c.curl module.

On top of that I've created a more D like api as seen below. This is 
located in the 'etc.curl' module. What you can see below currently works 
but before proceeding further down this road I would like to get your 
comments on it.

//
// Simple HTTP GET with sane defaults
// provides the .content, .headers and .status
//
writeln( Http.get("http://www.google.com").content );

//
// GET with custom data receiver delegates
//
Http http = new Http("http://www.google.dk");
http.setReceiveHeaderCallback( (string key, string value) {
	writeln(key ~ ":" ~ value);
} );
http.setReceiveCallback( (string data) { /* drop */ } );
http.perform;

//
// POST with some timouts
//
http.setUrl("http://www.testing.com/test.cgi");
http.setReceiveCallback( (string data) { writeln(data); } );
http.setConnectTimeout(1000);
http.setDataTimeout(1000);
http.setDnsTimeout(1000);
http.setPostData("The quick....");
http.perform;

//
// PUT with data sender delegate
//
string msg = "Hello world";
size_t len = msg.length; /* using chuncked transfer if omitted */

http.setSendCallback( delegate size_t(char[] data) {
     if (msg.empty) return 0;
     auto l = msg.length;
     data[0..l] = msg[0..$];
     msg.length = 0;
     return l;
     },
     HttpMethod.put, len );
http.perform;

//
// HTTPS
//
writeln(Http.get("https://mail.google.com").content);

//
// FTP
//
writeln(Ftp.get("ftp://ftp.digitalmars.com/sieve.ds",
                 "./downloaded-file"));


// ... authenication, cookies, interface select, progress callback
// etc. is also implemented this way.


/Jonas