1 files changed, 68 insertions, 0 deletions
diff --git a/wsutil/type_util.c b/wsutil/type_util.c
new file mode 100644
index 0000000..f98a1b1
--- /dev/null
+++ b/wsutil/type_util.c
@@ -0,0 +1,68 @@
+/* type_util.c
+ * Types utility routines
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <glib.h>
+
+#include "type_util.h"
+
+/*
+ * uint64_t to double conversions taken from gstutils.c of GStreamer project
+ *
+ * GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ *                    2000 Wim Taymans <wtay@chello.be>
+ *                    2002 Thomas Vander Stichele <thomas@apestaart.org>
+ *
+ * gstutils.h: Header for various utility functions
+ *
+ * GNU GPL v2
+ *
+ */
+
+/* work around error C2520: conversion from unsigned __int64 to double
+ * not implemented, use signed __int64
+ *
+ * These are implemented as functions because on some platforms a 64bit int to
+ * double conversion is not defined/implemented.
+ */
+
+double
+type_util_guint64_to_gdouble(uint64_t value)
+{
+  if (value & G_GUINT64_CONSTANT (0x8000000000000000))
+    return (double) ((int64_t) value) + (double) 18446744073709551616.;
+  else
+    return (double) ((int64_t) value);
+}
+
+uint64_t
+type_util_gdouble_to_guint64(double value)
+{
+  if (value < (double) 9223372036854775808.)   /* 1 << 63 */
+    return ((uint64_t) ((int64_t) value));
+
+  value -= (double) 18446744073709551616.;
+  return ((uint64_t) ((int64_t) value));
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local Variables:
+ * c-basic-offset: 2
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * ex: set shiftwidth=2 tabstop=8 expandtab:
+ * :indentSize=2:tabSize=8:noTabs=true:
+ */