/* * JFFS2 -- Journalling Flash File System, Version 2. * * Copyright (C) 2001, 2002 Red Hat, Inc. * * Created by David Woodhouse <dwmw2@infradead.org> * * For licensing information, see the file 'LICENCE' in this directory. * * $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;	unsigned int ofs;	unsigned int reserve;};  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){	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__ */