#include <stdbool.h>

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Macros
#define	USTAR_HEADER_SIZE 512
	Size of a ustar archive header, in bytes. More...

Enumerations
enum	ustar_type { USTAR_REGULAR = '0' , USTAR_DIRECTORY = '5' , USTAR_EOF = -1 }
	Support for the standard Posix "ustar" format. More...

Functions
bool	ustar_make_header (const char *file_name, enum ustar_type, int size, char header[USTAR_HEADER_SIZE])
	Composes HEADER as a USTAR_HEADER_SIZE (512)-byte archive header in ustar format for a SIZE-byte file named FILE_NAME of the given TYPE. More...

const char *	ustar_parse_header (const char header[USTAR_HEADER_SIZE], const char *file_name, enum ustar_type , int *size)
	lib/ustar.h More...

Macro Definition Documentation

◆ USTAR_HEADER_SIZE

#define USTAR_HEADER_SIZE 512

Size of a ustar archive header, in bytes.

Definition at line 21 of file ustar.h.

Enumeration Type Documentation

◆ ustar_type

enum ustar_type

Support for the standard Posix "ustar" format.

See the documentation of the "pax" utility in [SUSv3] for the the "ustar" format specification. 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.

Enumerator
USTAR_REGULAR	Ordinary file.
USTAR_DIRECTORY	Directory.
USTAR_EOF	End of archive (not an official value).

Definition at line 13 of file ustar.h.

Function Documentation

◆ ustar_make_header()

bool ustar_make_header	(	const char *	file_name,
		enum ustar_type	type,
		int	size,
		char	header[USTAR_HEADER_SIZE]
	)

Composes HEADER as a USTAR_HEADER_SIZE (512)-byte archive header in ustar format for a SIZE-byte file named FILE_NAME of the given TYPE.

The caller is responsible for writing the header to a file or device.

If successful, returns true. On failure (due to an excessively long file name), returns false.

Definition at line 83 of file ustar.c.

References ASSERT, calculate_chksum(), ustar_header::chksum, file_name, ustar_header::gid, ustar_header::gname, ustar_header::magic, memset(), ustar_header::mode, ustar_header::mtime, ustar_header::name, printf(), ustar_header::size, snprintf(), strip_antisocial_prefixes(), strlcpy(), strlen(), ustar_header::typeflag, ustar_header::uid, ustar_header::uname, USTAR_DIRECTORY, USTAR_HEADER_SIZE, USTAR_REGULAR, and ustar_header::version.

Referenced by fsutil_append(), and write_header().

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◆ ustar_parse_header()

const char * ustar_parse_header	(	const char	header[USTAR_HEADER_SIZE],
		const char **	file_name,
		enum ustar_type *	type,
		int *	size
	)

lib/ustar.h

If successful, stores the archived file's name in *FILE_NAME (as a pointer into HEADER or a string literal), its type in *TYPE, and its size in bytes in *SIZE, and returns a null pointer. On failure, returns a human-readable error message.

Definition at line 182 of file ustar.c.

References ASSERT, calculate_chksum(), ustar_header::chksum, file_name, INT_MAX, is_all_zeros(), ustar_header::magic, memcmp(), ustar_header::name, NULL, parse_octal_field(), ustar_header::prefix, ustar_header::size, strip_antisocial_prefixes(), ustar_header::typeflag, USTAR_DIRECTORY, USTAR_EOF, USTAR_HEADER_SIZE, USTAR_REGULAR, and ustar_header::version.

Referenced by fsutil_extract().