--- /dev/null
+#ifndef __LIB_USTAR_H
+#define __LIB_USTAR_H
+
+/* Support for the standard Posix "ustar" format. See the
+ documentation of the "pax" utility in [SUSv3] for the the
+ "ustar" format specification. */
+
+#include <stdbool.h>
+
+/* Type of a file entry in an archive.
+ The values here are the bytes that appear in the file format.
+ Only types of interest to Pintos are listed here. */
+enum ustar_type
+ {
+ USTAR_REGULAR = '0', /* Ordinary file. */
+ USTAR_DIRECTORY = '5', /* Directory. */
+ USTAR_EOF = -1 /* End of archive (not an official value). */
+ };
+
+/* Size of a ustar archive header, in bytes. */
+#define USTAR_HEADER_SIZE 512
+
+bool ustar_make_header (const char *file_name, enum ustar_type,
+ int size, char header[USTAR_HEADER_SIZE]);
+const char *ustar_parse_header (const char header[USTAR_HEADER_SIZE],
+ const char **file_name,
+ enum ustar_type *, int *size);
+
+#endif /* lib/ustar.h */