FreeBSD/Linux Kernel Cross Reference
sys/fs/jffs2/pushpull.h

     /*
      * JFFS2 -- Journalling Flash File System, Version 2.
      *
      * Copyright (C) 2001 Red Hat, Inc.
      *
      * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
      *
      * The original JFFS, from which the design for JFFS2 was derived,
      * was designed and implemented by Axis Communications AB.
     *
     * 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 $
     *
     */
    
    #ifndef __PUSHPULL_H__
    #define __PUSHPULL_H__
    struct pushpull {
            unsigned char *buf;
            unsigned int buflen;
            unsigned int ofs;
            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 int pullbit(struct pushpull *pp)
    {
            int bit;
    
            bit = (pp->buf[pp->ofs >> 3] >> (7-(pp->ofs & 7))) & 1;
    
            pp->ofs++;
            return bit;
    }
    
    static inline int pulledbits(struct pushpull *pp)
    {
            return pp->ofs;
    }
    
    #endif /* __PUSHPULL_H__ */

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