[gtk+/wip/alexl/file-chooser-portal] Add methods to serialize GtkFileFilter to a GVariant

[Matthias Clasen <matthiasc src gnome org>]

commit ccadf57ee323a6146058082dc3386b4b79aba2ae
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jun 11 00:45:27 2016 -0400

    Add methods to serialize GtkFileFilter to a GVariant
    
    This will be used to send filters of D-Bus in future commits.

 gtk/gtkfilefilter.c        |   79 ++++++++++++++++++++++++++++++++++++++++++++
 gtk/gtkfilefilterprivate.h |    2 +
 2 files changed, 81 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkfilefilter.c b/gtk/gtkfilefilter.c
index c4751e2..43f766f 100644
--- a/gtk/gtkfilefilter.c
+++ b/gtk/gtkfilefilter.c
@@ -718,3 +718,82 @@ gtk_file_filter_filter (GtkFileFilter           *filter,
 
   return FALSE;
 }
+
+GVariant *
+gtk_file_filter_to_gvariant (GtkFileFilter *filter)
+{
+  GVariantBuilder builder;
+  GSList *l;
+
+  g_variant_builder_init (&builder, G_VARIANT_TYPE ("a(us)"));
+  for (l = filter->rules; l; l = l->next)
+    {
+      FilterRule *rule = l->data;
+
+      switch (rule->type)
+        {
+        case FILTER_RULE_PATTERN:
+          g_variant_builder_add (&builder, "(us)", 0, rule->u.mime_type);
+          break;
+        case FILTER_RULE_MIME_TYPE:
+          g_variant_builder_add (&builder, "(us)", 1, rule->u.mime_type);
+          break;
+        case FILTER_RULE_PIXBUF_FORMATS:
+          {
+           GSList *f;
+
+           for (f = rule->u.pixbuf_formats; f; f = f->next)
+             {
+                GdkPixbufFormat *fmt = f->data;
+                gchar **mime_types;
+                int i;
+
+                mime_types = gdk_pixbuf_format_get_mime_types (fmt);
+                for (i = 0; mime_types[i]; i++)
+                  g_variant_builder_add (&builder, "(us)", 1, mime_types[i]);
+                g_strfreev (mime_types);
+              }
+          }
+          break;
+        case FILTER_RULE_CUSTOM:
+        default:
+          break;
+        }
+    }
+
+  return g_variant_new ("(s a(us))", filter->name, g_variant_builder_end (&builder));
+}
+
+GtkFileFilter *
+gtk_file_filter_from_gvariant (GVariant *variant)
+{
+  GtkFileFilter *filter;
+  GVariantIter *iter;
+  const char *name;
+  int type;
+  char *tmp;
+
+  filter = gtk_file_filter_new ();
+
+  g_variant_get (variant, "(&sa(us))", &name, &iter);
+
+  gtk_file_filter_set_name (filter, name);
+
+  while (g_variant_iter_next (iter, "(u&s)", &type, &tmp))
+    {
+      switch (type)
+        {
+        case 0:
+          gtk_file_filter_add_pattern (filter, tmp);
+          break;
+        case 1:
+          gtk_file_filter_add_mime_type (filter, tmp);
+          break;
+        default:
+          break;
+       }
+    }
+  g_variant_iter_free (iter);
+
+  return filter;
+}
diff --git a/gtk/gtkfilefilterprivate.h b/gtk/gtkfilefilterprivate.h
index 0a3d4a4..80c2e77 100644
--- a/gtk/gtkfilefilterprivate.h
+++ b/gtk/gtkfilefilterprivate.h
@@ -25,6 +25,8 @@ G_BEGIN_DECLS
 
 char ** _gtk_file_filter_get_as_patterns (GtkFileFilter      *filter);
 
+GVariant      *gtk_file_filter_to_gvariant   (GtkFileFilter *filter);
+GtkFileFilter *gtk_file_filter_from_gvariant (GVariant      *variant);
 G_END_DECLS
 
 #endif /* __GTK_FILE_FILTER_PRIVATE_H__ */