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1 office 1 /* type_util.c
2 * Types utility routines
3 *
4 * Wireshark - Network traffic analyzer
5 * By Gerald Combs <gerald@wireshark.org>
6 * Copyright 1998 Gerald Combs
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22  
23 #include "config.h"
24  
25 #include "type_util.h"
26  
27 /*
28 * guint64 to gdouble conversions taken from gstutils.c of GStreamer project
29 *
30 * GStreamer
31 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
32 * 2000 Wim Taymans <wtay@chello.be>
33 * 2002 Thomas Vander Stichele <thomas@apestaart.org>
34 *
35 * gstutils.h: Header for various utility functions
36 *
37 * GNU GPL v2
38 *
39 */
40  
41 /* work around error C2520: conversion from unsigned __int64 to double
42 * not implemented, use signed __int64
43 *
44 * These are implemented as functions because on some platforms a 64bit int to
45 * double conversion is not defined/implemented.
46 */
47  
48 gdouble
49 type_util_guint64_to_gdouble(guint64 value)
50 {
51 if (value & G_GUINT64_CONSTANT (0x8000000000000000))
52 return (gdouble) ((gint64) value) + (gdouble) 18446744073709551616.;
53 else
54 return (gdouble) ((gint64) value);
55 }
56  
57 guint64
58 type_util_gdouble_to_guint64(gdouble value)
59 {
60 if (value < (gdouble) 9223372036854775808.) /* 1 << 63 */
61 return ((guint64) ((gint64) value));
62  
63 value -= (gdouble) 18446744073709551616.;
64 return ((guint64) ((gint64) value));
65 }
66  
67 /*
68 * Editor modelines - http://www.wireshark.org/tools/modelines.html
69 *
70 * Local Variables:
71 * c-basic-offset: 2
72 * tab-width: 8
73 * indent-tabs-mode: nil
74 * End:
75 *
76 * ex: set shiftwidth=2 tabstop=8 expandtab:
77 * :indentSize=2:tabSize=8:noTabs=true:
78 */