4 * Wireshark - Network traffic analyzer
5 * By Gerald Combs <gerald@wireshark.org>
6 * Copyright 1998 Gerald Combs
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.
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.
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.
23 #ifndef __WSUTIL_SIGN_EXT_H__
24 #define __WSUTIL_SIGN_EXT_H__
28 /* sign extension routines */
31 ws_sign_ext32(guint32 val, int no_of_bits)
33 if (val & (1 << (no_of_bits-1)))
34 val |= (-1 << no_of_bits);
40 ws_sign_ext64(guint64 val, int no_of_bits)
42 if (val & (G_GINT64_CONSTANT(1) << (no_of_bits-1)))
43 val |= (G_GINT64_CONSTANT(-1) << no_of_bits);
50 ws_sign_ext64(guint64 val, int no_of_bits)
52 gint64 sval = (val << (64 - no_of_bits));
54 return (guint64) (sval >> (64 - no_of_bits));
58 #endif /* __WSUTIL_SIGN_EXT_H__ */