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113 lines
3.7 KiB
C
113 lines
3.7 KiB
C
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/* Extended tar format from POSIX.1.
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Copyright (C) 1992-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Written by David J. MacKenzie.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _TAR_H
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#define _TAR_H 1
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#include <features.h>
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/* A tar archive consists of 512-byte blocks.
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Each file in the archive has a header block followed by 0+ data blocks.
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Two blocks of NUL bytes indicate the end of the archive. */
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/* The fields of header blocks:
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All strings are stored as ISO 646 (approximately ASCII) strings.
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Fields are numeric unless otherwise noted below; numbers are ISO 646
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representations of octal numbers, with leading zeros as needed.
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linkname is only valid when typeflag==LNKTYPE. It doesn't use prefix;
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files that are links to pathnames >100 chars long can not be stored
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in a tar archive.
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If typeflag=={LNKTYPE,SYMTYPE,DIRTYPE} then size must be 0.
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devmajor and devminor are only valid for typeflag=={BLKTYPE,CHRTYPE}.
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chksum contains the sum of all 512 bytes in the header block,
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treating each byte as an 8-bit unsigned value and treating the
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8 bytes of chksum as blank characters.
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uname and gname are used in preference to uid and gid, if those
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names exist locally.
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Field Name Byte Offset Length in Bytes Field Type
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name 0 100 NUL-terminated if NUL fits
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mode 100 8
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uid 108 8
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gid 116 8
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size 124 12
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mtime 136 12
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chksum 148 8
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typeflag 156 1 see below
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linkname 157 100 NUL-terminated if NUL fits
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magic 257 6 must be TMAGIC (NUL term.)
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version 263 2 must be TVERSION
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uname 265 32 NUL-terminated
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gname 297 32 NUL-terminated
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devmajor 329 8
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devminor 337 8
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prefix 345 155 NUL-terminated if NUL fits
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If the first character of prefix is '\0', the file name is name;
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otherwise, it is prefix/name. Files whose pathnames don't fit in that
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length can not be stored in a tar archive. */
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/* The bits in mode: */
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#define TSUID 04000
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#define TSGID 02000
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#if defined __USE_XOPEN || !defined __USE_XOPEN2K
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# define TSVTX 01000
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#endif
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#define TUREAD 00400
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#define TUWRITE 00200
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#define TUEXEC 00100
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#define TGREAD 00040
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#define TGWRITE 00020
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#define TGEXEC 00010
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#define TOREAD 00004
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#define TOWRITE 00002
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#define TOEXEC 00001
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/* The values for typeflag:
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Values 'A'-'Z' are reserved for custom implementations.
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All other values are reserved for future POSIX.1 revisions. */
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#define REGTYPE '0' /* Regular file (preferred code). */
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#define AREGTYPE '\0' /* Regular file (alternate code). */
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#define LNKTYPE '1' /* Hard link. */
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#define SYMTYPE '2' /* Symbolic link (hard if not supported). */
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#define CHRTYPE '3' /* Character special. */
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#define BLKTYPE '4' /* Block special. */
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#define DIRTYPE '5' /* Directory. */
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#define FIFOTYPE '6' /* Named pipe. */
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#define CONTTYPE '7' /* Contiguous file */
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/* (regular file if not supported). */
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/* Contents of magic field and its length. */
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#define TMAGIC "ustar"
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#define TMAGLEN 6
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/* Contents of the version field and its length. */
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#define TVERSION "00"
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#define TVERSLEN 2
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#endif /* tar.h */
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