libpackage: Use libcurl directly for downloads.

- Initial step towards allowing listening for download progress.

headers/private/package/FetchFileJob.h

@@ -1,5 +1,6 @@
 /*
  * Copyright 2011, Oliver Tappe <[email protected]>
+ * Copyright 2013, Rene Gollent <[email protected]>
  * Distributed under the terms of the MIT License.
  */
 #ifndef _PACKAGE__PRIVATE__FETCH_FILE_JOB_H_
@@ -7,6 +8,7 @@
 
 
 #include <Entry.h>
+#include <File.h>
 #include <String.h>
 
 #include <package/Job.h>
@@ -31,9 +33,19 @@ protected:
 	virtual	status_t			Execute();
 	virtual	void				Cleanup(status_t jobResult);
 
+private:
+	// libcurl callbacks
+	static	int 				_ProgressCallback(void *clientp,
+									double dltotal, double dlnow,
+									double ultotal,	double ulnow);
+
+	static	size_t				_WriteCallback(void *buffer, size_t size,
+									size_t nmemb, void *userp);
+
 private:
 			BString				fFileURL;
 			BEntry				fTargetEntry;
+			BFile				fTargetFile;
 };