mirror of
https://github.com/MidnightCommander/mc
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236 lines
6.6 KiB
C
236 lines
6.6 KiB
C
/* Declarations for the tarfs.
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Copyright (C) 1995 The Free Software Foundation
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Written by: 1995 Jakub Jelinek
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#if 0
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#include "testpad.h"
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#else
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#define NEEDPAD
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#endif
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#include <sys/types.h>
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/* major() and minor() macros (among other things) defined here for hpux */
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#ifdef hpux
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#include <sys/mknod.h>
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#endif
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/*
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* Header block on tape.
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*
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* I'm going to use traditional DP naming conventions here.
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* A "block" is a big chunk of stuff that we do I/O on.
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* A "record" is a piece of info that we care about.
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* Typically many "record"s fit into a "block".
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*/
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#define RECORDSIZE 512
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#define NAMSIZ 100
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#define TUNMLEN 32
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#define TGNMLEN 32
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#define SPARSE_EXT_HDR 21
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#define SPARSE_IN_HDR 4
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struct sparse {
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char offset[12];
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char numbytes[12];
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};
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struct sp_array {
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int offset;
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int numbytes;
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};
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union record {
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char charptr[RECORDSIZE];
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struct header {
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char arch_name[NAMSIZ];
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char mode[8];
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char uid[8];
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char gid[8];
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char size[12];
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char mtime[12];
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char chksum[8];
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char linkflag;
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char arch_linkname[NAMSIZ];
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char magic[8];
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char uname[TUNMLEN];
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char gname[TGNMLEN];
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char devmajor[8];
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char devminor[8];
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/* these following fields were added by JF for gnu */
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/* and are NOT standard */
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char atime[12];
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char ctime[12];
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char offset[12];
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char longnames[4];
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#ifdef NEEDPAD
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char pad;
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#endif
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struct sparse sp[SPARSE_IN_HDR];
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char isextended;
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char realsize[12]; /* true size of the sparse file */
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/* char ending_blanks[12];*//* number of nulls at the
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end of the file, if any */
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} header;
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struct extended_header {
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struct sparse sp[21];
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char isextended;
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} ext_hdr;
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};
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/* The checksum field is filled with this while the checksum is computed. */
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#define CHKBLANKS " " /* 8 blanks, no null */
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/* The magic field is filled with this if uname and gname are valid. */
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#define TMAGIC "ustar " /* 7 chars and a null */
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/* The linkflag defines the type of file */
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#define LF_OLDNORMAL '\0' /* Normal disk file, Unix compat */
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#define LF_NORMAL '0' /* Normal disk file */
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#define LF_LINK '1' /* Link to previously dumped file */
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#define LF_SYMLINK '2' /* Symbolic link */
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#define LF_CHR '3' /* Character special file */
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#define LF_BLK '4' /* Block special file */
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#define LF_DIR '5' /* Directory */
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#define LF_FIFO '6' /* FIFO special file */
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#define LF_CONTIG '7' /* Contiguous file */
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/* Further link types may be defined later. */
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/* Note that the standards committee allows only capital A through
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capital Z for user-defined expansion. This means that defining something
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as, say '8' is a *bad* idea. */
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#define LF_DUMPDIR 'D' /* This is a dir entry that contains
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the names of files that were in
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the dir at the time the dump
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was made */
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#define LF_LONGLINK 'K' /* Identifies the NEXT file on the tape
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as having a long linkname */
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#define LF_LONGNAME 'L' /* Identifies the NEXT file on the tape
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as having a long name. */
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#define LF_MULTIVOL 'M' /* This is the continuation
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of a file that began on another
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volume */
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#define LF_NAMES 'N' /* For storing filenames that didn't
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fit in 100 characters */
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#define LF_SPARSE 'S' /* This is for sparse files */
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#define LF_VOLHDR 'V' /* This file is a tape/volume header */
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/* Ignore it on extraction */
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/*
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* Exit codes from the "tar" program
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*/
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#define EX_SUCCESS 0 /* success! */
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#define EX_ARGSBAD 1 /* invalid args */
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#define EX_BADFILE 2 /* invalid filename */
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#define EX_BADARCH 3 /* bad archive */
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#define EX_SYSTEM 4 /* system gave unexpected error */
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#define EX_BADVOL 5 /* Special error code means
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Tape volume doesn't match the one
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specified on the command line */
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/*
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* We default to Unix Standard format rather than 4.2BSD tar format.
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* The code can actually produce all three:
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* f_standard ANSI standard
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* f_oldarch V7
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* neither 4.2BSD
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* but we don't bother, since 4.2BSD can read ANSI standard format anyway.
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* The only advantage to the "neither" option is that we can cmp our
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* output to the output of 4.2BSD tar, for debugging.
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*/
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#define f_standard (!f_oldarch)
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#ifndef TAR_NAMES
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struct tarfs_inode;
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struct tarfs_entry {
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int has_changed;
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long header_offset; /* -1 if not in stored in archive */
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int header_size;
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struct tarfs_entry *next_in_dir;
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struct tarfs_entry *dir;
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long extended_offset; /* -1 if not present */
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int extended_size;
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char *name;
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struct tarfs_inode *inode;
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};
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struct tarfs_archive;
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struct tarfs_inode {
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int has_changed;
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int is_open;
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nlink_t nlink;
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struct tarfs_entry *first_in_subdir; /* only used if linkflag == L_DIR */
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struct tarfs_entry *last_in_subdir;
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long data_offset;
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char *local_filename;
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ino_t inode; /* This is inode # */
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dev_t dev; /* This is an internal identification of the tar archive */
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struct tarfs_archive *archive; /* And this is an archive structure */
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dev_t rdev;
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int std; /* 0 if old Unix inode */
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umode_t mode;
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uid_t uid;
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gid_t gid;
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int size;
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time_t mtime;
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char linkflag;
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char *linkname;
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time_t atime;
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time_t ctime;
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};
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struct tarfs_archive {
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char *name;
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struct stat tarstat;
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int is_gzipped;
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dev_t rdev;
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ino_t __inode_counter;
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struct tarfs_entry *root_entry;
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struct tarfs_entry *current_dir;
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struct tarfs_archive *next;
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long current_tar_position;
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int fd;
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int fd_usage; /* Zero means fd is invalid, otherwise is number of
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pseudofiles that have the archive open */
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char *tmpname; /* For case of is_gzipped == 2 */
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/* This part is only for gzipped archives: (growable buffers) */
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union record *block_first;
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int count_first; /* In records */
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union record **block_ptr;
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int count_blocks; /* In blocks */
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union record *current_record; /* position when reading */
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};
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/* This constant determines how many RECORDSIZE blocks are in one growing
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chunk */
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#define TAR_GROWING_CHUNK_SIZE 64
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enum {
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tar_normal,
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targz_growing,
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tar_uncompressed_local
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};
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#endif /* ! TAR_NAMES */
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