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phoenix |
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright (C) 2001 Red Hat, Inc.
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*
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* Created by David Woodhouse <dwmw2@cambridge.redhat.com>
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*
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* The original JFFS, from which the design for JFFS2 was derived,
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* was designed and implemented by Axis Communications AB.
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*
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* The contents of this file are subject to the Red Hat eCos Public
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* License Version 1.1 (the "Licence"); you may not use this file
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* except in compliance with the Licence. You may obtain a copy of
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* the Licence at http://www.redhat.com/
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*
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* Software distributed under the Licence is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
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* See the Licence for the specific language governing rights and
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* limitations under the Licence.
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*
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* The Original Code is JFFS2 - Journalling Flash File System, version 2
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU General Public License version 2 (the "GPL"), in
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* which case the provisions of the GPL are applicable instead of the
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* above. If you wish to allow the use of your version of this file
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* only under the terms of the GPL and not to allow others to use your
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* version of this file under the RHEPL, indicate your decision by
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* deleting the provisions above and replace them with the notice and
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* other provisions required by the GPL. If you do not delete the
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* provisions above, a recipient may use your version of this file
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* under either the RHEPL or the GPL.
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*
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* $Id: pushpull.h,v 1.1.1.1 2004-04-15 01:11:08 phoenix Exp $
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*
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*/
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#ifndef __PUSHPULL_H__
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#define __PUSHPULL_H__
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struct pushpull {
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unsigned char *buf;
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unsigned int buflen;
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unsigned int ofs;
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unsigned int reserve;
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};
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void init_pushpull(struct pushpull *, char *, unsigned, unsigned, unsigned);
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int pushbit(struct pushpull *pp, int bit, int use_reserved);
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int pushedbits(struct pushpull *pp);
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static inline int pullbit(struct pushpull *pp)
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{
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int bit;
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bit = (pp->buf[pp->ofs >> 3] >> (7-(pp->ofs & 7))) & 1;
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pp->ofs++;
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return bit;
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}
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static inline int pulledbits(struct pushpull *pp)
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{
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return pp->ofs;
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}
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#endif /* __PUSHPULL_H__ */
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