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-libarchive-formats(3)  FreeBSD Library Functions Manual  libarchive-formats(3)
-
-NAME
-     libarchive-formats -- archive formats supported by the libarchive library
-
-DESCRIPTION
-     The libarchive(3) library reads and writes a variety of streaming archive
-     formats.  Generally speaking, all of these archive formats consist of a
-     series of ``entries''.  Each entry stores a single file system object,
-     such as a file, directory, or symbolic link.
-
-     The following provides a brief description of each format supported by
-     libarchive, with some information about recognized extensions or limita-
-     tions of the current library support.  Note that just because a format is
-     supported by libarchive does not imply that a program that uses
-     libarchive will support that format.  Applications that use libarchive
-     specify which formats they wish to support.
-
-   Tar Formats
-     The libarchive(3) library can read most tar archives.  However, it only
-     writes POSIX-standard ``ustar'' and ``pax interchange'' formats.
-
-     All tar formats store each entry in one or more 512-byte records.	The
-     first record is used for file metadata, including filename, timestamp,
-     and mode information, and the file data is stored in subsequent records.
-     Later variants have extended this by either appropriating undefined areas
-     of the header record, extending the header to multiple records, or by
-     storing special entries that modify the interpretation of subsequent
-     entries.
-
-     gnutar  The libarchive(3) library can read GNU-format tar archives.  It
-	     currently supports the most popular GNU extensions, including
-	     modern long filename and linkname support, as well as atime and
-	     ctime data.  The libarchive library does not support multi-volume
-	     archives, nor the old GNU long filename format.  It can read GNU
-	     sparse file entries, including the new POSIX-based formats, but
-	     cannot write GNU sparse file entries.
-
-     pax     The libarchive(3) library can read and write POSIX-compliant pax
-	     interchange format archives.  Pax interchange format archives are
-	     an extension of the older ustar format that adds a separate entry
-	     with additional attributes stored as key/value pairs.  The pres-
-	     ence of this additional entry is the only difference between pax
-	     interchange format and the older ustar format.  The extended
-	     attributes are of unlimited length and are stored as UTF-8 Uni-
-	     code strings.  Keywords defined in the standard are in all lower-
-	     case; vendors are allowed to define custom keys by preceding them
-	     with the vendor name in all uppercase.  When writing pax ar-
-	     chives, libarchive uses many of the SCHILY keys defined by Joerg
-	     Schilling's ``star'' archiver.  The libarchive library can read
-	     most of the SCHILY keys.  It silently ignores any keywords that
-	     it does not understand.
-
-     restricted pax
-	     The libarchive library can also write pax archives in which it
-	     attempts to suppress the extended attributes entry whenever pos-
-	     sible.  The result will be identical to a ustar archive unless
-	     the extended attributes entry is required to store a long file
-	     name, long linkname, extended ACL, file flags, or if any of the
-	     standard ustar data (user name, group name, UID, GID, etc) cannot
-	     be fully represented in the ustar header.	In all cases, the
-	     result can be dearchived by any program that can read POSIX-com-
-	     pliant pax interchange format archives.  Programs that correctly
-	     read ustar format (see below) will also be able to read this for-
-	     mat; any extended attributes will be extracted as separate files
-	     stored in PaxHeader directories.
-
-     ustar   The libarchive library can both read and write this format.  This
-	     format has the following limitations:
-	     o	 Device major and minor numbers are limited to 21 bits.  Nodes
-		 with larger numbers will not be added to the archive.
-	     o	 Path names in the archive are limited to 255 bytes.  (Shorter
-		 if there is no / character in exactly the right place.)
-	     o	 Symbolic links and hard links are stored in the archive with
-		 the name of the referenced file.  This name is limited to 100
-		 bytes.
-	     o	 Extended attributes, file flags, and other extended security
-		 information cannot be stored.
-	     o	 Archive entries are limited to 2 gigabytes in size.
-	     Note that the pax interchange format has none of these restric-
-	     tions.
-
-     The libarchive library can also read a variety of commonly-used exten-
-     sions to the basic tar format.  In particular, it supports base-256 val-
-     ues in certain numeric fields.  This essentially removes the limitations
-     on file size, modification time, and device numbers.
-
-     The first tar program appeared in Seventh Edition Unix in 1979.  The
-     first official standard for the tar file format was the ``ustar'' (Unix
-     Standard Tar) format defined by POSIX in 1988.  POSIX.1-2001 extended the
-     ustar format to create the ``pax interchange'' format.
-
-   Cpio Formats
-     The libarchive library can read a number of common cpio variants and can
-     write ``odc'' and ``newc'' format archives.  A cpio archive stores each
-     entry as a fixed-size header followed by a variable-length filename and
-     variable-length data.  Unlike tar, cpio does only minimal padding of the
-     header or file data.  There are a variety of cpio formats, which differ
-     primarily in how they store the initial header: some store the values as
-     octal or hexadecimal numbers in ASCII, others as binary values of varying
-     byte order and length.
-
-     binary  The libarchive library can read both big-endian and little-endian
-	     variants of the original binary cpio format.  This format used
-	     32-bit binary values for file size and mtime, and 16-bit binary
-	     values for the other fields.
-
-     odc     The libarchive library can both read and write this POSIX-stan-
-	     dard format.  This format stores the header contents as octal
-	     values in ASCII.  It is standard, portable, and immune from byte-
-	     order confusion.  File sizes and mtime are limited to 33 bits
-	     (8GB file size), other fields are limited to 18 bits.
-
-     SVR4    The libarchive library can read both CRC and non-CRC variants of
-	     this format.  The SVR4 format uses eight-digit hexadecimal values
-	     for all header fields.  This limits file size to 4GB, and also
-	     limits the mtime and other fields to 32 bits.  The SVR4 format
-	     can optionally include a CRC of the file contents, although
-	     libarchive does not currently verify this CRC.
-
-     Cpio first appeared in PWB/UNIX 1.0, which was released within AT&T in
-     1977.  PWB/UNIX 1.0 formed the basis of System III Unix, released outside
-     of AT&T in 1981.  This makes cpio older than tar, although cpio was not
-     included in Version 7 AT&T Unix.  As a result, the tar command became
-     much better known in universities and research groups that used Version
-     7.  The combination of the find and cpio utilities provided very precise
-     control over file selection.  Unfortunately, the format has many limita-
-     tions that make it unsuitable for widespread use.	Only the POSIX format
-     permits files over 4GB, and its 18-bit limit for most other fields makes
-     it unsuitable for modern systems.	In addition, cpio formats only store
-     numeric UID/GID values (not usernames and group names), which can make it
-     very difficult to correctly transfer archives across systems with dissim-
-     ilar user numbering.
-
-   Shar Formats
-     A ``shell archive'' is a shell script that, when executed on a POSIX-com-
-     pliant system, will recreate a collection of file system objects.	The
-     libarchive library can write two different kinds of shar archives:
-
-     shar    The traditional shar format uses a limited set of POSIX commands,
-	     including echo(1), mkdir(1), and sed(1).  It is suitable for
-	     portably archiving small collections of plain text files.	How-
-	     ever, it is not generally well-suited for large archives (many
-	     implementations of sh(1) have limits on the size of a script) nor
-	     should it be used with non-text files.
-
-     shardump
-	     This format is similar to shar but encodes files using
-	     uuencode(1) so that the result will be a plain text file regard-
-	     less of the file contents.  It also includes additional shell
-	     commands that attempt to reproduce as many file attributes as
-	     possible, including owner, mode, and flags.  The additional com-
-	     mands used to restore file attributes make shardump archives less
-	     portable than plain shar archives.
-
-   ISO9660 format
-     Libarchive can read and extract from files containing ISO9660-compliant
-     CDROM images.  It also has partial support for Rockridge extensions.  In
-     many cases, this can remove the need to burn a physical CDROM.  It also
-     avoids security and complexity issues that come with virtual mounts and
-     loopback devices.
-
-   Zip format
-     Libarchive can extract from most zip format archives.  It currently only
-     supports uncompressed entries and entries compressed with the ``deflate''
-     algorithm.  Older zip compression algorithms are not supported.
-
-   Archive (library) file format
-     The Unix archive format (commonly created by the ar(1) archiver) is a
-     general-purpose format which is used almost exclusively for object files
-     to be read by the link editor ld(1).  The ar format has never been stan-
-     dardised.	There are two common variants: the GNU format derived from
-     SVR4, and the BSD format, which first appeared in 4.4BSD.	Libarchive
-     provides read and write support for both variants.
-
-   mtree
-     Libarchive can read files in mtree(5) format. This format is not a true
-     archive format, but rather a description of a file hierarchy. When
-     requested, libarchive obtains the contents of the files described by the
-     mtree(5) format from files on disk instead.
-
-SEE ALSO
-     ar(1), cpio(1), mkisofs(1), shar(1), tar(1), zip(1), zlib(3), cpio(5),
-     mtree(5), tar(5)
-
-FreeBSD 6.0			April 27, 2004			   FreeBSD 6.0