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2 - 1 
#define	g2byte(x)	(((x)[1]<<8) + (x)[0])		/* little-endian */
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#define	g3byte(x)	(((x)[2]<<16) + ((x)[1]<<8) + (x)[0])
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#define	g4byte(x)	(((x)[3]<<24) + ((x)[2]<<16) + ((x)[1]<<8) + (x)[0])
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/* big endian */
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#define	b4byte(x)	(((x)[0]<<24) + ((x)[1]<<16) + ((x)[2]<<8) + (x)[3])
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#define	b8byte(x)	(((vlong)b4byte(x)<<32) | (u32int)b4byte((x)+4))
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enum
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{
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	OPERM	= 0x3,		/* mask of all permission types in open mode */
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	Nram	= 512,
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	Maxbuf	= 8192,		/* max buffer size */
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};
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typedef struct Fid Fid;
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typedef struct Ram Ram;
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struct Fid
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{
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	short	busy;
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	short	open;
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	short	rclose;
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	int	fid;
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	Fid	*next;
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	char	*user;
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	Ram	*ram;
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};
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struct Ram
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{
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	char	busy;
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	char	open;
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	char	replete;
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	Ram	*parent;	/* parent directory */
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	Ram	*child;		/* first member of directory */
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	Ram	*next;		/* next member of file's directory */
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	Qid	qid;
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	long	perm;
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	char	*name;
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	ulong	atime;
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	ulong	mtime;
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	char	*user;
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	char	*group;
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	vlong addr;
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	void *data;
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	vlong	ndata;
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};
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enum
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{
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	Pexec =		1,
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	Pwrite = 	2,
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	Pread = 	4,
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	Pother = 	1,
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	Pgroup = 	8,
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	Powner =	64,
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};
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typedef struct idmap {
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	char	*name;
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	int	id;
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} Idmap;
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typedef struct fileinf {
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	char	*name;
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	vlong	addr;
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	void	*data;
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	vlong	size;
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	int	mode;
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	int	uid;
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	int	gid;
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	long	mdate;
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} Fileinf;
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extern	ulong	path;		/* incremented for each new file */
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extern	Ram	*ram;
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extern	char	*user;
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extern	Idmap	*uidmap;
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extern	Idmap	*gidmap;
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extern	int	replete;
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extern	int	blocksize;
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void	error(char*);
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void	*erealloc(void*, ulong);
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void	*emalloc(ulong);
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char	*estrdup(char*);
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void	populate(char *);
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void	dotrunc(Ram*);
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void	docreate(Ram*);
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char	*doread(Ram*, vlong, long);
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void	dowrite(Ram*, char*, long, long);
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int	dopermw(Ram*);
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Idmap	*getpass(char*);
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char	*mapid(Idmap*,int);
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Ram	*poppath(Fileinf fi, int new);
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Ram	*popfile(Ram *dir, Fileinf fi);
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void	popdir(Ram*);
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Ram	*lookup(Ram*, char*);