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-README for libarchive bundle.
-
-This distribution bundle includes the following components:
-
- * libarchive: a library for reading and writing streaming archives
- * tar: the 'bsdtar' program is a full-featured 'tar'
- replacement built on libarchive
- * cpio: the 'bsdcpio' program is a different interface to
- essentially the same functionality
- * examples: Some small example programs that you may find useful.
- * examples/minitar: a compact sample demonstrating use of libarchive.
- I use this for testing link pollution; it should produce a very
- small executable file on most systems.
- * contrib: Various items sent to me by third parties;
- please contact the authors with any questions.
-
-The top-level directory contains the following information files:
- * NEWS - highlights of recent changes
- * COPYING - what you can do with this
- * INSTALL - installation instructions
- * README - this file
- * configure - configuration script, see INSTALL for details.
-
-The following files in the top-level directory are used by the
-'configure' script:
-
- * Makefile.am, aclocal.m4, configure.ac
- - used to build this distribution, only needed by maintainers
- * Makefile.in, config.h.in
- - templates used by configure script
- * config.aux/* - auxiliary scripts used by build system
-
-Guide to Documentation installed by this system:
- * bsdtar.1 explains the use of the bsdtar program
- * bsdcpio.1 explains the use of the bsdcpio program
- * libarchive.3 gives an overview of the library as a whole
- * archive_read.3, archive_write.3, and archive_write_disk.3 provide
- detailed calling sequences for the read and write APIs
- * archive_entry.3 details the "struct archive_entry" utility class
- * archive_internals.3 provides some insight into libarchive's
- internal structure and operation.
- * libarchive-formats.5 documents the file formats supported by the library
- * cpio.5, mtree.5, and tar.5 provide detailed information about a
- variety of different archive formats, including hard-to-find details
- about modern cpio and tar variants.
-
-You should also read the copious comments in "archive.h" and the source
-code for the sample "bsdtar" program for more details. Please let me know
-about any errors or omissions you find.
-
-Currently, the library automatically detects and reads the following:
- * gzip compression
- * bzip2 compression
- * compress/LZW compression
- * GNU tar format (including GNU long filenames, long link names, and
- sparse files)
- * Solaris 9 extended tar format (including ACLs)
- * Old V7 tar archives
- * POSIX ustar
- * POSIX pax interchange format
- * POSIX octet-oriented cpio
- * SVR4 ASCII cpio
- * Binary cpio (big-endian or little-endian)
- * ISO9660 CD-ROM images (with optional Rockridge extensions)
- * ZIP archives (with uncompressed or "deflate" compressed entries)
- * GNU and BSD 'ar' archives
- * 'mtree' format
-
-The library can write:
- * gzip compression
- * bzip2 compression
- * POSIX ustar
- * POSIX pax interchange format
- * "restricted" pax format, which will create ustar archives except for
- entries that require pax extensions (for long filenames, ACLs, etc).
- * POSIX octet-oriented cpio
- * SVR4 "newc" cpio
- * shar archives
- * GNU and BSD 'ar' archives
-
-Notes about the library architecture:
-
- * This is a heavily stream-oriented system. There is no direct
- support for in-place modification or random access and no intention
- of ever adding such support. Adding such support would require
- sacrificing a lot of other features, so don't bother asking.
-
- * The library is designed to be extended with new compression and
- archive formats. The only requirement is that the format be
- readable or writable as a stream and that each archive entry be
- independent.
-
- * On read, compression and format are always detected automatically.
-
- * I've attempted to minimize static link pollution. If you don't
- explicitly invoke a particular feature (such as support for a
- particular compression or format), it won't get pulled in.
- In particular, if you don't explicitly enable a particular
- compression or decompression support, you won't need to link
- against the corresponding compression or decompression libraries.
- This also reduces the size of statically-linked binaries in
- environments where that matters.
-
- * On read, the library accepts whatever blocks you hand it.
- Your read callback is free to pass the library a byte at a time[1]
- or mmap the entire archive and give it to the library at once.
- On write, the library always produces correctly-blocked output.
-
- * The object-style approach allows you to have multiple archive streams
- open at once. bsdtar uses this in its "@archive" extension.
-
- * The archive itself is read/written using callback functions.
- You can read an archive directly from an in-memory buffer or
- write it to a socket, if you wish. There are some utility
- functions to provide easy-to-use "open file," etc, capabilities.
-
- * The read/write APIs are designed to allow individual entries
- to be read or written to any data source: You can create
- a block of data in memory and add it to a tar archive without
- first writing a temporary file. You can also read an entry from
- an archive and write the data directly to a socket. If you want
- to read/write entries to disk, there are convenience functions to
- make this especially easy.
-
- * Note: "pax interchange format" is really an extended tar format,
- despite what the name says.
-
-[1] Gzip and compress formats are identical in the first byte.
-For that reason, the first block must be at least two bytes if
-you have both of these formats enabled at read time. This is
-currently the only restriction on block size. (This restriction
-could be lifted by buffering the initial blocks prior to the
-compression tasting step, but it doesn't really seem worth the
-effort.)