forked from osmocom/wireshark
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
/* type_util.c
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* Types utility routines
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include "type_util.h"
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/*
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* guint64 to gdouble conversions taken from gstutils.c of GStreamer project
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*
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* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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* 2002 Thomas Vander Stichele <thomas@apestaart.org>
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*
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* gstutils.h: Header for various utility functions
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*
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* GNU GPL v2
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*
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*/
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/* work around error C2520: conversion from unsigned __int64 to double
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* not implemented, use signed __int64
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*
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* These are implemented as functions because on some platforms a 64bit int to
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* double conversion is not defined/implemented.
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*/
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gdouble
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type_util_guint64_to_gdouble(guint64 value)
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{
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if (value & G_GUINT64_CONSTANT (0x8000000000000000))
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return (gdouble) ((gint64) value) + (gdouble) 18446744073709551616.;
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else
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return (gdouble) ((gint64) value);
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}
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guint64
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type_util_gdouble_to_guint64(gdouble value)
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{
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if (value < (gdouble) 9223372036854775808.) /* 1 << 63 */
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return ((guint64) ((gint64) value));
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value -= (gdouble) 18446744073709551616.;
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return ((guint64) ((gint64) value));
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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