/* 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, 675 Mass Ave, Cambridge, MA 02139, USA. */ #if 0 #include "testpad.h" #else #define NEEDPAD #endif #include /* major() and minor() macros (among other things) defined here for hpux */ #ifdef hpux #include #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) #ifndef TAR_NAMES struct tarfs_inode; struct tarfs_entry { int has_changed; long header_offset; /* -1 if not in stored in archive */ int header_size; struct tarfs_entry *next_in_dir; struct tarfs_entry *dir; long extended_offset; /* -1 if not present */ int extended_size; char *name; struct tarfs_inode *inode; }; struct tarfs_archive; struct tarfs_inode { int has_changed; int is_open; nlink_t nlink; struct tarfs_entry *first_in_subdir; /* only used if linkflag == L_DIR */ struct tarfs_entry *last_in_subdir; long data_offset; char *local_filename; ino_t inode; /* This is inode # */ dev_t dev; /* This is an internal identification of the tar archive */ struct tarfs_archive *archive; /* And this is an archive structure */ dev_t rdev; int std; /* 0 if old Unix inode */ umode_t mode; uid_t uid; gid_t gid; int size; time_t mtime; char linkflag; char *linkname; time_t atime; time_t ctime; }; struct tarfs_archive { char *name; struct stat tarstat; int is_gzipped; dev_t rdev; ino_t __inode_counter; struct tarfs_entry *root_entry; struct tarfs_entry *current_dir; struct tarfs_archive *next; long current_tar_position; int fd; int fd_usage; /* Zero means fd is invalid, otherwise is number of pseudofiles that have the archive open */ char *tmpname; /* For case of is_gzipped == 2 */ /* This part is only for gzipped archives: (growable buffers) */ union record *block_first; int count_first; /* In records */ union record **block_ptr; int count_blocks; /* In blocks */ union record *current_record; /* position when reading */ }; /* This constant determines how many RECORDSIZE blocks are in one growing chunk */ #define TAR_GROWING_CHUNK_SIZE 64 enum { tar_normal, targz_growing, tar_uncompressed_local }; #endif /* ! TAR_NAMES */