1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright (C) 2001 Red Hat, Inc.
5 *
6 * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
7 *
8 * The original JFFS, from which the design for JFFS2 was derived,
9 * was designed and implemented by Axis Communications AB.
10 *
11 * The contents of this file are subject to the Red Hat eCos Public
12 * License Version 1.1 (the "Licence"); you may not use this file
13 * except in compliance with the Licence. You may obtain a copy of
14 * the Licence at http://www.redhat.com/
15 *
16 * Software distributed under the Licence is distributed on an "AS IS"
17 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
18 * See the Licence for the specific language governing rights and
19 * limitations under the Licence.
20 *
21 * The Original Code is JFFS2 - Journalling Flash File System, version 2
22 *
23 * Alternatively, the contents of this file may be used under the
24 * terms of the GNU General Public License version 2 (the "GPL"), in
25 * which case the provisions of the GPL are applicable instead of the
26 * above. If you wish to allow the use of your version of this file
27 * only under the terms of the GPL and not to allow others to use your
28 * version of this file under the RHEPL, indicate your decision by
29 * deleting the provisions above and replace them with the notice and
30 * other provisions required by the GPL. If you do not delete the
31 * provisions above, a recipient may use your version of this file
32 * under either the RHEPL or the GPL.
33 *
34 * $Id: pushpull.h,v 1.5 2001/09/23 10:04:15 rmk Exp $
35 *
36 */
37
38 #ifndef __PUSHPULL_H__
39 #define __PUSHPULL_H__
40 struct pushpull {
41 unsigned char *buf;
42 unsigned int buflen;
43 unsigned int ofs;
44 unsigned int reserve;
45 };
46
47 void init_pushpull(struct pushpull *, char *, unsigned, unsigned, unsigned);
48 int pushbit(struct pushpull *pp, int bit, int use_reserved);
49 int pushedbits(struct pushpull *pp);
50
pullbit(struct pushpull * pp)51 static inline int pullbit(struct pushpull *pp)
52 {
53 int bit;
54
55 bit = (pp->buf[pp->ofs >> 3] >> (7-(pp->ofs & 7))) & 1;
56
57 pp->ofs++;
58 return bit;
59 }
60
pulledbits(struct pushpull * pp)61 static inline int pulledbits(struct pushpull *pp)
62 {
63 return pp->ofs;
64 }
65
66 #endif /* __PUSHPULL_H__ */
67