diff options
Diffstat (limited to 'linux-2.4.x/fs/jffs2/pushpull.h')
| -rw-r--r-- | linux-2.4.x/fs/jffs2/pushpull.h | 68 |
1 files changed, 37 insertions, 31 deletions
diff --git a/linux-2.4.x/fs/jffs2/pushpull.h b/linux-2.4.x/fs/jffs2/pushpull.h index dba10f3..c0c2a91 100644 --- a/linux-2.4.x/fs/jffs2/pushpull.h +++ b/linux-2.4.x/fs/jffs2/pushpull.h @@ -1,42 +1,21 @@ /* * JFFS2 -- Journalling Flash File System, Version 2. * - * Copyright (C) 2001 Red Hat, Inc. + * Copyright (C) 2001, 2002 Red Hat, Inc. * - * Created by David Woodhouse <dwmw2@cambridge.redhat.com> + * Created by David Woodhouse <dwmw2@infradead.org> * - * The original JFFS, from which the design for JFFS2 was derived, - * was designed and implemented by Axis Communications AB. + * For licensing information, see the file 'LICENCE' in this directory. * - * The contents of this file are subject to the Red Hat eCos Public - * License Version 1.1 (the "Licence"); you may not use this file - * except in compliance with the Licence. You may obtain a copy of - * the Licence at http://www.redhat.com/ - * - * Software distributed under the Licence is distributed on an "AS IS" - * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. - * See the Licence for the specific language governing rights and - * limitations under the Licence. - * - * The Original Code is JFFS2 - Journalling Flash File System, version 2 - * - * Alternatively, the contents of this file may be used under the - * terms of the GNU General Public License version 2 (the "GPL"), in - * which case the provisions of the GPL are applicable instead of the - * above. If you wish to allow the use of your version of this file - * only under the terms of the GPL and not to allow others to use your - * version of this file under the RHEPL, indicate your decision by - * deleting the provisions above and replace them with the notice and - * other provisions required by the GPL. If you do not delete the - * provisions above, a recipient may use your version of this file - * under either the RHEPL or the GPL. - * - * $Id: pushpull.h,v 1.5 2001/09/23 10:04:15 rmk Exp $ + * $Id: pushpull.h,v 1.10 2004/11/16 20:36:11 dwmw2 Exp $ * */ #ifndef __PUSHPULL_H__ #define __PUSHPULL_H__ + +#include <linux/errno.h> + struct pushpull { unsigned char *buf; unsigned int buflen; @@ -44,9 +23,36 @@ struct pushpull { unsigned int reserve; }; -void init_pushpull(struct pushpull *, char *, unsigned, unsigned, unsigned); -int pushbit(struct pushpull *pp, int bit, int use_reserved); -int pushedbits(struct pushpull *pp); + +static inline void init_pushpull(struct pushpull *pp, char *buf, unsigned buflen, unsigned ofs, unsigned reserve) +{ + pp->buf = buf; + pp->buflen = buflen; + pp->ofs = ofs; + pp->reserve = reserve; +} + +static inline int pushbit(struct pushpull *pp, int bit, int use_reserved) +{ + if (pp->ofs >= pp->buflen - (use_reserved?0:pp->reserve)) { + return -ENOSPC; + } + + if (bit) { + pp->buf[pp->ofs >> 3] |= (1<<(7-(pp->ofs &7))); + } + else { + pp->buf[pp->ofs >> 3] &= ~(1<<(7-(pp->ofs &7))); + } + pp->ofs++; + + return 0; +} + +static inline int pushedbits(struct pushpull *pp) +{ + return pp->ofs; +} static inline int pullbit(struct pushpull *pp) { |