/*
  * Header file for public domain tar (tape archive) program.
  *
  * @(#)tar.h 1.20 86/10/29	Public Domain.
  *
  * Created 25 August 1985 by John Gilmore, ihnp4!hoptoad!gnu.
  *

  * $Id: is_tar.h,v 1.2 2007/02/11 00:41:13 tkojm Exp $ # checkin only

  */
 
 /*
  * Header block on tape.
  *
  * I'm going to use traditional DP naming conventions here.
  * A "block" is a big chunk of stuff that we do I/O on.
  * A "record" is a piece of info that we care about.
  * Typically many "record"s fit into a "block".
  */
 #define	RECORDSIZE	512
 #define	NAMSIZ	100
 #define	TUNMLEN	32
 #define	TGNMLEN	32
 
 union record {
 	char		charptr[RECORDSIZE];
 	struct header {
 		char	name[NAMSIZ];
 		char	mode[8];
 		char	uid[8];
 		char	gid[8];
 		char	size[12];
 		char	mtime[12];
 		char	chksum[8];
 		char	linkflag;
 		char	linkname[NAMSIZ];
 		char	magic[8];
 		char	uname[TUNMLEN];
 		char	gname[TGNMLEN];
 		char	devmajor[8];
 		char	devminor[8];
 	} header;
 };
 
 /* The magic field is filled with this if uname and gname are valid. */
 #define	TMAGIC		"ustar  "	/* 7 chars and a null */

 
 int is_tar(unsigned char *buf, unsigned int nbytes);