1/* Extended tar format from POSIX.1. 2 Copyright (C) 1992, 1996 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 Written by David J. MacKenzie. 5 6 The GNU C Library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 The GNU C Library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with the GNU C Library; if not, write to the Free 18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 19 02111-1307 USA. */ 20 21#ifndef _TAR_H 22#define _TAR_H 1 23 24/* A tar archive consists of 512-byte blocks. 25 Each file in the archive has a header block followed by 0+ data blocks. 26 Two blocks of NUL bytes indicate the end of the archive. */ 27 28/* The fields of header blocks: 29 All strings are stored as ISO 646 (approximately ASCII) strings. 30 31 Fields are numeric unless otherwise noted below; numbers are ISO 646 32 representations of octal numbers, with leading zeros as needed. 33 34 linkname is only valid when typeflag==LNKTYPE. It doesn't use prefix; 35 files that are links to pathnames >100 chars long can not be stored 36 in a tar archive. 37 38 If typeflag=={LNKTYPE,SYMTYPE,DIRTYPE} then size must be 0. 39 40 devmajor and devminor are only valid for typeflag=={BLKTYPE,CHRTYPE}. 41 42 chksum contains the sum of all 512 bytes in the header block, 43 treating each byte as an 8-bit unsigned value and treating the 44 8 bytes of chksum as blank characters. 45 46 uname and gname are used in preference to uid and gid, if those 47 names exist locally. 48 49 Field Name Byte Offset Length in Bytes Field Type 50 name 0 100 NUL-terminated if NUL fits 51 mode 100 8 52 uid 108 8 53 gid 116 8 54 size 124 12 55 mtime 136 12 56 chksum 148 8 57 typeflag 156 1 see below 58 linkname 157 100 NUL-terminated if NUL fits 59 magic 257 6 must be TMAGIC (NUL term.) 60 version 263 2 must be TVERSION 61 uname 265 32 NUL-terminated 62 gname 297 32 NUL-terminated 63 devmajor 329 8 64 devminor 337 8 65 prefix 345 155 NUL-terminated if NUL fits 66 67 If the first character of prefix is '\0', the file name is name; 68 otherwise, it is prefix/name. Files whose pathnames don't fit in that 69 length can not be stored in a tar archive. */ 70 71/* The bits in mode: */ 72#define TSUID 04000 73#define TSGID 02000 74#define TSVTX 01000 75#define TUREAD 00400 76#define TUWRITE 00200 77#define TUEXEC 00100 78#define TGREAD 00040 79#define TGWRITE 00020 80#define TGEXEC 00010 81#define TOREAD 00004 82#define TOWRITE 00002 83#define TOEXEC 00001 84 85/* The values for typeflag: 86 Values 'A'-'Z' are reserved for custom implementations. 87 All other values are reserved for future POSIX.1 revisions. */ 88 89#define REGTYPE '0' /* Regular file (preferred code). */ 90#define AREGTYPE '\0' /* Regular file (alternate code). */ 91#define LNKTYPE '1' /* Hard link. */ 92#define SYMTYPE '2' /* Symbolic link (hard if not supported). */ 93#define CHRTYPE '3' /* Character special. */ 94#define BLKTYPE '4' /* Block special. */ 95#define DIRTYPE '5' /* Directory. */ 96#define FIFOTYPE '6' /* Named pipe. */ 97#define CONTTYPE '7' /* Contiguous file */ 98 /* (regular file if not supported). */ 99 100/* Contents of magic field and its length. */ 101#define TMAGIC "ustar" 102#define TMAGLEN 6 103 104/* Contents of the version field and its length. */ 105#define TVERSION "00" 106#define TVERSLEN 2 107 108#endif /* tar.h */ 109