blob: 26d590a6934d760cd68214b087febc055fe71e08 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
/*
* sign_ext.h
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __WSUTIL_SIGN_EXT_H__
#define __WSUTIL_SIGN_EXT_H__
#include <glib.h>
/* sign extension routines */
static inline guint32
ws_sign_ext32(guint32 val, int no_of_bits)
{
if (val & (1 << (no_of_bits-1)))
val |= (-1 << no_of_bits);
return val;
}
static inline guint64
ws_sign_ext64(guint64 val, int no_of_bits)
{
if (val & (G_GINT64_CONSTANT(1) << (no_of_bits-1)))
val |= (G_GINT64_CONSTANT(-1) << no_of_bits);
return val;
}
/*
static inline guint64
ws_sign_ext64(guint64 val, int no_of_bits)
{
gint64 sval = (val << (64 - no_of_bits));
return (guint64) (sval >> (64 - no_of_bits));
}
*/
#endif /* __WSUTIL_SIGN_EXT_H__ */
|
