glib: add Array len(), data() and element_size()

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>

glib/src/array.rs

@@ -1,7 +1,10 @@
 // Take a look at the license at the top of the repository in the LICENSE file.
 
+use crate::translate::*;
+use std::fmt;
+
 wrapper! {
-    #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+    #[derive(PartialEq, Eq, PartialOrd, Ord, Hash)]
     pub struct Array(Shared<ffi::GArray>);
 
     match fn {
@@ -10,3 +13,31 @@ wrapper! {
         get_type => || ffi::g_array_get_type(),
     }
 }
+
+impl Array {
+    pub fn len(&self) -> usize {
+        unsafe { (*self.to_glib_none().0).len as usize }
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.len() == 0
+    }
+
+    pub fn data(&self) -> *mut libc::c_void {
+        unsafe { (*self.to_glib_none().0).data as _ }
+    }
+
+    pub fn element_size(&self) -> usize {
+        unsafe { ffi::g_array_get_element_size(self.to_glib_none().0) as usize }
+    }
+}
+
+impl fmt::Debug for Array {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("Array")
+            .field("len", &self.len())
+            .field("data", &self.data())
+            .field("element_size", &self.element_size())
+            .finish()
+    }
+}