libarchive/archive_read_format.3

.\" Copyright (c) 2003-2011 Tim Kientzle
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.\" $FreeBSD: head/lib/libarchive/archive_read.3 191595 2009-04-27 20:13:13Z kientzle $
.\"
.Dd March 19, 2011
.Dt archive_read_format 3
.Os
.Sh NAME
.Nm archive_read_support_format_all ,
.Nm archive_read_support_format_ar ,
.Nm archive_read_support_format_cpio ,
.Nm archive_read_support_format_empty ,
.Nm archive_read_support_format_iso9660 ,
.Nm archive_read_support_format_mtree,
.Nm archive_read_support_format_raw,
.Nm archive_read_support_format_tar ,
.Nm archive_read_support_format_zip
.Nd functions for reading streaming archives
.\"
.Sh SYNOPSIS
.In archive.h
.Ft int
.Fn archive_read_support_format_all "struct archive *"
.Ft int
.Fn archive_read_support_format_ar "struct archive *"
.Ft int
.Fn archive_read_support_format_cpio "struct archive *"
.Ft int
.Fn archive_read_support_format_empty "struct archive *"
.Ft int
.Fn archive_read_support_format_iso9660 "struct archive *"
.Ft int
.Fn archive_read_support_format_mtree "struct archive *"
.Ft int
.Fn archive_read_support_format_raw "struct archive *"
.Ft int
.Fn archive_read_support_format_tar "struct archive *"
.Ft int
.Fn archive_read_support_format_zip "struct archive *"
.\"
.Sh DESCRIPTION
.Bl -tag -compact -width indent
.It Xo
.Fn archive_read_support_format_all ,
.Fn archive_read_support_format_ar ,
.Fn archive_read_support_format_cpio ,
.Fn archive_read_support_format_empty ,
.Fn archive_read_support_format_iso9660 ,
.Fn archive_read_support_format_mtree ,
.Fn archive_read_support_format_tar ,
.Fn archive_read_support_format_zip
.Xc
Enables support---including auto-detection code---for the
specified archive format.
For example,
.Fn archive_read_support_format_tar
enables support for a variety of standard tar formats, old-style tar,
ustar, pax interchange format, and many common variants.
For convenience,
.Fn archive_read_support_format_all
enables support for all available formats.
Only empty archives are supported by default.
.It Fn archive_read_support_format_raw
The
.Dq raw
format handler allows libarchive to be used to read arbitrary data.
It treats any data stream as an archive with a single entry.
The pathname of this entry is
.Dq data ;
all other entry fields are unset.
This is not enabled by
.Fn archive_read_support_format_all
in order to avoid erroneous handling of damaged archives.
.El
.\" .Sh EXAMPLE
.Sh RETURN VALUES
These functions return
.Cm ARCHIVE_OK
on success, or
.Cm ARCHIVE_FATAL .
.\"
.Sh ERRORS
Detailed error codes and textual descriptions are available from the
.Fn archive_errno
and
.Fn archive_error_string
functions.
.\"
.Sh SEE ALSO
.Xr tar 1 ,
.Xr libarchive 3 ,
.Xr archive_read_data 3 ,
.Xr archive_read_filter 3 ,
.Xr archive_read_set_options 3 ,
.Xr archive_util 3 ,
.Xr tar 5
.Sh BUGS
Many traditional archiver programs treat
empty files as valid empty archives.
For example, many implementations of
.Xr tar 1
allow you to append entries to an empty file.
Of course, it is impossible to determine the format of an empty file
by inspecting the contents, so this library treats empty files as
having a special
.Dq empty
format.