- struct upkg_export *export;
- struct upkg_import *iclass, *ipackage;
- unsigned long pkg_idx;
-
- if (idx >= pkg->export_count)
- return NULL;
-
- export = &pkg->priv->exports[idx];
-
- /* Assumption: class references are always imports. */
- format_assert(export->class <= 0, return NULL);
-
- /* Get the class. */
- if (export->class == 0) {
- if (package) *package = "Core";
- return "Class";
- }
-
- pkg_idx = -(export->class + 1);
- if (pkg_idx >= pkg->import_count)
- return NULL;
- iclass = &pkg->priv->imports[pkg_idx];
-
- /* Assumption: class references are always Core.Class. */
- format_assert(!strcmp(iclass->class_package, "Core"), return NULL);
- format_assert(!strcmp(iclass->class_name, "Class"), return NULL);
-
- /* Assumption: package references are always imports. */
- format_assert(iclass->package <= 0, return NULL);