qlit: add qobject_from_qlit()

Instantiate a QObject* from a literal QLitObject.

LitObject only supports int64_t for now.  uint64_t and double aren't
implemented.
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
Message-Id: <20180305172951.2150-4-marcandre.lureau@redhat.com>
Signed-off-by: NEric Blake <eblake@redhat.com>

include/qapi/qmp/qlit.h

@@ -50,4 +50,6 @@ struct QLitDictEntry {
 
 bool qlit_equal_qobject(const QLitObject *lhs, const QObject *rhs);
 
+QObject *qobject_from_qlit(const QLitObject *qlit);
+
 #endif /* QLIT_H */

qobject/qlit.c

@@ -21,6 +21,7 @@
 #include "qapi/qmp/qnum.h"
 #include "qapi/qmp/qdict.h"
 #include "qapi/qmp/qstring.h"
+#include "qapi/qmp/qnull.h"
 
 static bool qlit_equal_qdict(const QLitObject *lhs, const QDict *qdict)
 {
@@ -86,3 +87,39 @@ bool qlit_equal_qobject(const QLitObject *lhs, const QObject *rhs)
 
     return false;
 }
+
+QObject *qobject_from_qlit(const QLitObject *qlit)
+{
+    switch (qlit->type) {
+    case QTYPE_QNULL:
+        return QOBJECT(qnull());
+    case QTYPE_QNUM:
+        return QOBJECT(qnum_from_int(qlit->value.qnum));
+    case QTYPE_QSTRING:
+        return QOBJECT(qstring_from_str(qlit->value.qstr));
+    case QTYPE_QDICT: {
+        QDict *qdict = qdict_new();
+        QLitDictEntry *e;
+
+        for (e = qlit->value.qdict; e->key; e++) {
+            qdict_put_obj(qdict, e->key, qobject_from_qlit(&e->value));
+        }
+        return QOBJECT(qdict);
+    }
+    case QTYPE_QLIST: {
+        QList *qlist = qlist_new();
+        QLitObject *e;
+
+        for (e = qlit->value.qlist; e->type != QTYPE_NONE; e++) {
+            qlist_append_obj(qlist, qobject_from_qlit(e));
+        }
+        return QOBJECT(qlist);
+    }
+    case QTYPE_QBOOL:
+        return QOBJECT(qbool_from_bool(qlit->value.qbool));
+    default:
+        assert(0);
+    }
+
+    return NULL;
+}

tests/check-qlit.c

@@ -9,9 +9,11 @@
 
 #include "qemu/osdep.h"
 
+#include "qapi/qmp/qbool.h"
 #include "qapi/qmp/qdict.h"
 #include "qapi/qmp/qlist.h"
 #include "qapi/qmp/qlit.h"
+#include "qapi/qmp/qnum.h"
 #include "qapi/qmp/qstring.h"
 
 static QLitObject qlit = QLIT_QDICT(((QLitDictEntry[]) {
@@ -63,11 +65,37 @@ static void qlit_equal_qobject_test(void)
     qobject_decref(qobj);
 }
 
+static void qobject_from_qlit_test(void)
+{
+    QObject *obj, *qobj = qobject_from_qlit(&qlit);
+    QDict *qdict;
+    QList *bee;
+
+    qdict = qobject_to_qdict(qobj);
+    g_assert_cmpint(qdict_get_int(qdict, "foo"), ==, 42);
+    g_assert_cmpstr(qdict_get_str(qdict, "bar"), ==, "hello world");
+    g_assert(qobject_type(qdict_get(qdict, "baz")) == QTYPE_QNULL);
+
+    bee = qdict_get_qlist(qdict, "bee");
+    obj = qlist_pop(bee);
+    g_assert_cmpint(qnum_get_int(qobject_to_qnum(obj)), ==, 43);
+    qobject_decref(obj);
+    obj = qlist_pop(bee);
+    g_assert_cmpint(qnum_get_int(qobject_to_qnum(obj)), ==, 44);
+    qobject_decref(obj);
+    obj = qlist_pop(bee);
+    g_assert(qbool_get_bool(qobject_to_qbool(obj)));
+    qobject_decref(obj);
+
+    qobject_decref(qobj);
+}
+
 int main(int argc, char **argv)
 {
     g_test_init(&argc, &argv, NULL);
 
     g_test_add_func("/qlit/equal_qobject", qlit_equal_qobject_test);
+    g_test_add_func("/qlit/qobject_from_qlit", qobject_from_qlit_test);
 
     return g_test_run();
 }