fetcher: Move high level functions into "fetcher-util"

Conceptually these now lay on top of the core API, and don't reference libsoup.
This is preparation for libcurl porting, but it's also just generally better.

Closes: #636
Approved by: jlebon

src/libostree/ostree-fetcher-util.h

@@ -0,0 +1,49 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
+ *
+ * Copyright (C) 2016 Colin Walters <walters@verbum.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#pragma once
+
+#ifndef __GI_SCANNER__
+
+#include "ostree-fetcher.h"
+
+G_BEGIN_DECLS
+
+gboolean _ostree_fetcher_mirrored_request_to_membuf (OstreeFetcher *fetcher,
+                                                     GPtrArray     *mirrorlist,
+                                                     const char    *filename,
+                                                     gboolean       add_nul,
+                                                     gboolean       allow_noent,
+                                                     GBytes         **out_contents,
+                                                     guint64        max_size,
+                                                     GCancellable   *cancellable,
+                                                     GError         **error);
+
+gboolean _ostree_fetcher_request_uri_to_membuf (OstreeFetcher *fetcher,
+                                                OstreeFetcherURI *uri,
+                                                gboolean       add_nul,
+                                                gboolean       allow_noent,
+                                                GBytes         **out_contents,
+                                                guint64        max_size,
+                                                GCancellable   *cancellable,
+                                                GError         **error);
+G_END_DECLS
+
+#endif