/*
  * 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(const unsigned char *buf, unsigned int nbytes);