[librsvg] rsvg_handle_set_base_gfile(): Port the implementation to Rust

[Federico Mena Quintero <federico src gnome org>]

commit 8de888f02f2bcc5ec36f767355def6c61f915552
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Jan 8 17:48:21 2019 -0600

    rsvg_handle_set_base_gfile(): Port the implementation to Rust

 librsvg/rsvg-handle.c        |  7 ++-----
 rsvg_internals/src/handle.rs | 24 +++++++++++++++++++++++-
 rsvg_internals/src/lib.rs    |  1 +
 3 files changed, 26 insertions(+), 6 deletions(-)
---
diff --git a/librsvg/rsvg-handle.c b/librsvg/rsvg-handle.c
index adb85776..082c57a9 100644
--- a/librsvg/rsvg-handle.c
+++ b/librsvg/rsvg-handle.c
@@ -151,6 +151,7 @@ extern double rsvg_handle_rust_get_dpi_y (RsvgHandleRust *raw_handle);
 extern void rsvg_handle_rust_set_dpi_x (RsvgHandleRust *raw_handle, double dpi_x);
 extern void rsvg_handle_rust_set_dpi_y (RsvgHandleRust *raw_handle, double dpi_y);
 extern void rsvg_handle_rust_set_base_url (RsvgHandleRust *raw_handle, const char *uri);
+extern void rsvg_handle_rust_set_base_gfile (RsvgHandleRust *raw_handle, GFile *file);
 extern const char *rsvg_handle_rust_get_base_url (RsvgHandleRust *raw_handle);
 extern GFile *rsvg_handle_rust_get_base_gfile (RsvgHandleRust *raw_handle);
 extern guint rsvg_handle_rust_get_flags (RsvgHandleRust *raw_handle);
@@ -817,14 +818,10 @@ void
 rsvg_handle_set_base_gfile (RsvgHandle *handle,
                             GFile      *base_file)
 {
-    char *uri;
-
     g_return_if_fail (RSVG_IS_HANDLE (handle));
     g_return_if_fail (G_IS_FILE (base_file));
 
-    uri = g_file_get_uri (base_file);
-    rsvg_handle_rust_set_base_url (handle->priv->rust_handle, uri);
-    g_free (uri);
+    rsvg_handle_rust_set_base_gfile (handle->priv->rust_handle, base_file);
 }
 
 /**
diff --git a/rsvg_internals/src/handle.rs b/rsvg_internals/src/handle.rs
index e2e33821..16497567 100644
--- a/rsvg_internals/src/handle.rs
+++ b/rsvg_internals/src/handle.rs
@@ -9,7 +9,7 @@ use cairo::{self, ImageSurface, Status};
 use cairo_sys;
 use gdk_pixbuf::{Colorspace, Pixbuf, PixbufLoader, PixbufLoaderExt};
 use gdk_pixbuf_sys;
-use gio::File as GFile;
+use gio::{File as GFile, FileExt};
 use gio_sys;
 use glib::translate::*;
 use glib_sys;
@@ -194,6 +194,14 @@ impl Handle {
         }
     }
 
+    fn set_base_gfile(&self, file: &GFile) {
+        if let Some(uri) = file.get_uri() {
+            self.set_base_url(&uri);
+        } else {
+            rsvg_g_warning("file has no URI; will not set the base URI");
+        }
+    }
+
     pub fn read_stream_sync(
         &mut self,
         handle: *mut RsvgHandle,
@@ -751,6 +759,20 @@ pub unsafe extern "C" fn rsvg_handle_rust_get_base_gfile(
     }
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn rsvg_handle_rust_set_base_gfile(
+    raw_handle: *const Handle,
+    raw_gfile: *mut gio_sys::GFile,
+) {
+    let handle = &*raw_handle;
+
+    assert!(!raw_gfile.is_null());
+
+    let file: GFile = from_glib_none(raw_gfile);
+
+    handle.set_base_gfile(&file);
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn rsvg_handle_rust_get_base_url(
     raw_handle: *const Handle,
diff --git a/rsvg_internals/src/lib.rs b/rsvg_internals/src/lib.rs
index 66637c0a..4ee9766c 100644
--- a/rsvg_internals/src/lib.rs
+++ b/rsvg_internals/src/lib.rs
@@ -55,6 +55,7 @@ pub use handle::{
     rsvg_handle_rust_new,
     rsvg_handle_rust_read_stream_sync,
     rsvg_handle_rust_render_cairo_sub,
+    rsvg_handle_rust_set_base_gfile,
     rsvg_handle_rust_set_base_url,
     rsvg_handle_rust_set_dpi_x,
     rsvg_handle_rust_set_dpi_y,