diff --git a/libtar/tar.h b/libtar/tar.h
new file mode 100644
index 0000000..ddfef75
--- /dev/null
+++ b/libtar/tar.h
@@ -0,0 +1,108 @@
+/* Extended tar format from POSIX.1.
+   Copyright (C) 1992, 1996 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Written by David J. MacKenzie.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef	_TAR_H
+#define	_TAR_H	1
+
+/* A tar archive consists of 512-byte blocks.
+   Each file in the archive has a header block followed by 0+ data blocks.
+   Two blocks of NUL bytes indicate the end of the archive.  */
+
+/* The fields of header blocks:
+   All strings are stored as ISO 646 (approximately ASCII) strings.
+
+   Fields are numeric unless otherwise noted below; numbers are ISO 646
+   representations of octal numbers, with leading zeros as needed.
+
+   linkname is only valid when typeflag==LNKTYPE.  It doesn't use prefix;
+   files that are links to pathnames >100 chars long can not be stored
+   in a tar archive.
+
+   If typeflag=={LNKTYPE,SYMTYPE,DIRTYPE} then size must be 0.
+
+   devmajor and devminor are only valid for typeflag=={BLKTYPE,CHRTYPE}.
+
+   chksum contains the sum of all 512 bytes in the header block,
+   treating each byte as an 8-bit unsigned value and treating the
+   8 bytes of chksum as blank characters.
+
+   uname and gname are used in preference to uid and gid, if those
+   names exist locally.
+
+   Field Name	Byte Offset	Length in Bytes	Field Type
+   name		0		100		NUL-terminated if NUL fits
+   mode		100		8
+   uid		108		8
+   gid		116		8
+   size		124		12
+   mtime	136		12
+   chksum	148		8
+   typeflag	156		1		see below
+   linkname	157		100		NUL-terminated if NUL fits
+   magic	257		6		must be TMAGIC (NUL term.)
+   version	263		2		must be TVERSION
+   uname	265		32		NUL-terminated
+   gname	297		32		NUL-terminated
+   devmajor	329		8
+   devminor	337		8
+   prefix	345		155		NUL-terminated if NUL fits
+
+   If the first character of prefix is '\0', the file name is name;
+   otherwise, it is prefix/name.  Files whose pathnames don't fit in that
+   length can not be stored in a tar archive.  */
+
+/* The bits in mode: */
+#define TSUID	04000
+#define TSGID	02000
+#define TSVTX	01000
+#define TUREAD	00400
+#define TUWRITE	00200
+#define TUEXEC	00100
+#define TGREAD	00040
+#define TGWRITE	00020
+#define TGEXEC	00010
+#define TOREAD	00004
+#define TOWRITE	00002
+#define TOEXEC	00001
+
+/* The values for typeflag:
+   Values 'A'-'Z' are reserved for custom implementations.
+   All other values are reserved for future POSIX.1 revisions.  */
+
+#define REGTYPE		'0'	/* Regular file (preferred code).  */
+#define AREGTYPE	'\0'	/* Regular file (alternate code).  */
+#define LNKTYPE		'1'	/* Hard link.  */
+#define SYMTYPE		'2'	/* Symbolic link (hard if not supported).  */
+#define CHRTYPE		'3'	/* Character special.  */
+#define BLKTYPE		'4'	/* Block special.  */
+#define DIRTYPE		'5'	/* Directory.  */
+#define FIFOTYPE	'6'	/* Named pipe.  */
+#define CONTTYPE	'7'	/* Contiguous file */
+ /* (regular file if not supported).  */
+
+/* Contents of magic field and its length.  */
+#define TMAGIC	"ustar"
+#define TMAGLEN	6
+
+/* Contents of the version field and its length.  */
+#define TVERSION	"00"
+#define TVERSLEN	2
+
+#endif /* tar.h */