mc/vfs/tar.h

157 lines
4.7 KiB
C

/* Declarations for the tarfs.
Copyright (C) 1995 The Free Software Foundation
Written by: 1995 Jakub Jelinek
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#if 0
#include "testpad.h"
#else
#define NEEDPAD
#endif
#include <sys/types.h>
/* major() and minor() macros (among other things) defined here for hpux */
#ifdef hpux
#include <sys/mknod.h>
#endif
/*
* 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
#define SPARSE_EXT_HDR 21
#define SPARSE_IN_HDR 4
struct sparse {
char offset[12];
char numbytes[12];
};
struct sp_array {
int offset;
int numbytes;
};
union record {
char charptr[RECORDSIZE];
struct header {
char arch_name[NAMSIZ];
char mode[8];
char uid[8];
char gid[8];
char size[12];
char mtime[12];
char chksum[8];
char linkflag;
char arch_linkname[NAMSIZ];
char magic[8];
char uname[TUNMLEN];
char gname[TGNMLEN];
char devmajor[8];
char devminor[8];
/* these following fields were added by JF for gnu */
/* and are NOT standard */
char atime[12];
char ctime[12];
char offset[12];
char longnames[4];
#ifdef NEEDPAD
char pad;
#endif
struct sparse sp[SPARSE_IN_HDR];
char isextended;
char realsize[12]; /* true size of the sparse file */
/* char ending_blanks[12];*//* number of nulls at the
end of the file, if any */
} header;
struct extended_header {
struct sparse sp[21];
char isextended;
} ext_hdr;
};
/* The checksum field is filled with this while the checksum is computed. */
#define CHKBLANKS " " /* 8 blanks, no null */
/* The magic field is filled with this if uname and gname are valid. */
#define TMAGIC "ustar " /* 7 chars and a null */
/* The linkflag defines the type of file */
#define LF_OLDNORMAL '\0' /* Normal disk file, Unix compat */
#define LF_NORMAL '0' /* Normal disk file */
#define LF_LINK '1' /* Link to previously dumped file */
#define LF_SYMLINK '2' /* Symbolic link */
#define LF_CHR '3' /* Character special file */
#define LF_BLK '4' /* Block special file */
#define LF_DIR '5' /* Directory */
#define LF_FIFO '6' /* FIFO special file */
#define LF_CONTIG '7' /* Contiguous file */
/* Further link types may be defined later. */
/* Note that the standards committee allows only capital A through
capital Z for user-defined expansion. This means that defining something
as, say '8' is a *bad* idea. */
#define LF_DUMPDIR 'D' /* This is a dir entry that contains
the names of files that were in
the dir at the time the dump
was made */
#define LF_LONGLINK 'K' /* Identifies the NEXT file on the tape
as having a long linkname */
#define LF_LONGNAME 'L' /* Identifies the NEXT file on the tape
as having a long name. */
#define LF_MULTIVOL 'M' /* This is the continuation
of a file that began on another
volume */
#define LF_NAMES 'N' /* For storing filenames that didn't
fit in 100 characters */
#define LF_SPARSE 'S' /* This is for sparse files */
#define LF_VOLHDR 'V' /* This file is a tape/volume header */
/* Ignore it on extraction */
/*
* Exit codes from the "tar" program
*/
#define EX_SUCCESS 0 /* success! */
#define EX_ARGSBAD 1 /* invalid args */
#define EX_BADFILE 2 /* invalid filename */
#define EX_BADARCH 3 /* bad archive */
#define EX_SYSTEM 4 /* system gave unexpected error */
#define EX_BADVOL 5 /* Special error code means
Tape volume doesn't match the one
specified on the command line */
/*
* We default to Unix Standard format rather than 4.2BSD tar format.
* The code can actually produce all three:
* f_standard ANSI standard
* f_oldarch V7
* neither 4.2BSD
* but we don't bother, since 4.2BSD can read ANSI standard format anyway.
* The only advantage to the "neither" option is that we can cmp our
* output to the output of 4.2BSD tar, for debugging.
*/
#define f_standard (!f_oldarch)