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/* tar archive format definitions and functions */
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#define islink(lf)	(isreallink(lf) || issymlink(lf))
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#define isreallink(lf)	((lf) == Lflink)
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#define issymlink(lf)	((lf) == Lfsymlink1 || (lf) == Lfsymlink2)
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#define HOWMANY(a, size)	(((a) + (size) - 1) / (size))
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#define ROUNDUP(a, size)	(HOWMANY(a, size) * (size))
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#define TAPEBLKS(bytes)		HOWMANY(bytes, Tblock)
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enum {
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	Tblock = 512u,
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	Namesz = 100,
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	/* link flags */
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	Lfplain1 = '\0',
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	Lfplain2 = '0',
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	Lflink,
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	Lfsymlink1,
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	Lfchr,
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	Lfblk,
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	Lfdir,
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	Lffifo,
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	Lfcontig,
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	Lfsymlink2 = 's',
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};
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typedef struct {
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	char	name[Namesz];
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	char	mode[8];
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	char	uid[8];
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	char	gid[8];
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	char	size[12];
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	char	mtime[12];
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	char	chksum[8];
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	char	linkflag;
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	char	linkname[Namesz];
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} Header;
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typedef union {
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	uchar	dummy[Tblock];
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	Header;
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} Hblock;
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/* tarsub.c */
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char *thisnm, *lastnm;
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unsigned checksum(Hblock *hp);
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int	closeout(int outf, char *, int prflag);
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int	getdir(Hblock *, int in, vlong *);
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ulong	otoi(char *s);
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void	newarch(void);
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uvlong	passtar(Hblock *hp, int in, int outf, vlong bytes);
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void	putempty(int out);
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void	readtar(int in, char *buffer, long size);
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uvlong	writetar(int outf, char *buffer, ulong size);