Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 125 insertions, 0 deletions

diff --git a/qobject/qlit.c b/qobject/qlit.c
new file mode 100644
index 000000000..be8332136
--- /dev/null
+++ b/qobject/qlit.c
@@ -0,0 +1,125 @@
+/*
+ * QLit literal qobject
+ *
+ * Copyright IBM, Corp. 2009
+ * Copyright (c) 2013, 2015, 2017 Red Hat Inc.
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *  Markus Armbruster <armbru@redhat.com>
+ *  Marc-André Lureau <marcandre.lureau@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+
+#include "qapi/qmp/qlit.h"
+#include "qapi/qmp/qbool.h"
+#include "qapi/qmp/qlist.h"
+#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)
+{
+    int i;
+
+    for (i = 0; lhs->value.qdict[i].key; i++) {
+        QObject *obj = qdict_get(qdict, lhs->value.qdict[i].key);
+
+        if (!qlit_equal_qobject(&lhs->value.qdict[i].value, obj)) {
+            return false;
+        }
+    }
+
+    /* Note: the literal qdict must not contain duplicates, this is
+     * considered a programming error and it isn't checked here. */
+    if (qdict_size(qdict) != i) {
+        return false;
+    }
+
+    return true;
+}
+
+static bool qlit_equal_qlist(const QLitObject *lhs, const QList *qlist)
+{
+    QListEntry *e;
+    int i = 0;
+
+    QLIST_FOREACH_ENTRY(qlist, e) {
+        QObject *obj = qlist_entry_obj(e);
+
+        if (!qlit_equal_qobject(&lhs->value.qlist[i], obj)) {
+            return false;
+        }
+        i++;
+    }
+
+    return !e && lhs->value.qlist[i].type == QTYPE_NONE;
+}
+
+bool qlit_equal_qobject(const QLitObject *lhs, const QObject *rhs)
+{
+    if (!rhs || lhs->type != qobject_type(rhs)) {
+        return false;
+    }
+
+    switch (lhs->type) {
+    case QTYPE_QBOOL:
+        return lhs->value.qbool == qbool_get_bool(qobject_to(QBool, rhs));
+    case QTYPE_QNUM:
+        return lhs->value.qnum ==  qnum_get_int(qobject_to(QNum, rhs));
+    case QTYPE_QSTRING:
+        return (strcmp(lhs->value.qstr,
+                       qstring_get_str(qobject_to(QString, rhs))) == 0);
+    case QTYPE_QDICT:
+        return qlit_equal_qdict(lhs, qobject_to(QDict, rhs));
+    case QTYPE_QLIST:
+        return qlit_equal_qlist(lhs, qobject_to(QList, rhs));
+    case QTYPE_QNULL:
+        return true;
+    default:
+        break;
+    }
+
+    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;
+}