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dependencies/libarchive-3.4.2/libarchive/archive_read_format.3
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dependencies/libarchive-3.4.2/libarchive/archive_read_format.3
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.\" Copyright (c) 2003-2011 Tim Kientzle
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 2, 2012
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.Dt ARCHIVE_READ_FORMAT 3
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.Os
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.Sh NAME
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.Nm archive_read_support_format_7zip ,
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.Nm archive_read_support_format_all ,
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.Nm archive_read_support_format_ar ,
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.Nm archive_read_support_format_by_code ,
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.Nm archive_read_support_format_cab ,
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.Nm archive_read_support_format_cpio ,
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.Nm archive_read_support_format_empty ,
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.Nm archive_read_support_format_iso9660 ,
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.Nm archive_read_support_format_lha ,
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.Nm archive_read_support_format_mtree ,
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.Nm archive_read_support_format_rar ,
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.Nm archive_read_support_format_raw ,
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.Nm archive_read_support_format_tar ,
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.Nm archive_read_support_format_xar ,
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.Nm archive_read_support_format_zip
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.Nd functions for reading streaming archives
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.\"
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.Sh LIBRARY
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Streaming Archive Library (libarchive, -larchive)
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.Sh SYNOPSIS
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.In archive.h
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.Ft int
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.Fn archive_read_support_format_7zip "struct archive *"
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.Ft int
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.Fn archive_read_support_format_all "struct archive *"
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.Ft int
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.Fn archive_read_support_format_ar "struct archive *"
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.Ft int
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.Fn archive_read_support_format_by_code "struct archive *" "int"
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.Ft int
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.Fn archive_read_support_format_cab "struct archive *"
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.Ft int
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.Fn archive_read_support_format_cpio "struct archive *"
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.Ft int
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.Fn archive_read_support_format_empty "struct archive *"
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.Ft int
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.Fn archive_read_support_format_iso9660 "struct archive *"
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.Ft int
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.Fn archive_read_support_format_lha "struct archive *"
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.Ft int
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.Fn archive_read_support_format_mtree "struct archive *"
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.Ft int
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.Fn archive_read_support_format_rar "struct archive *"
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.Ft int
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.Fn archive_read_support_format_raw "struct archive *"
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.Ft int
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.Fn archive_read_support_format_tar "struct archive *"
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.Ft int
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.Fn archive_read_support_format_xar "struct archive *"
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.Ft int
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.Fn archive_read_support_format_zip "struct archive *"
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.\"
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.Sh DESCRIPTION
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.Bl -tag -compact -width indent
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.It Xo
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.Fn archive_read_support_format_7zip ,
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.Fn archive_read_support_format_ar ,
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.Fn archive_read_support_format_cab ,
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.Fn archive_read_support_format_cpio ,
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.Fn archive_read_support_format_iso9660 ,
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.Fn archive_read_support_format_lha ,
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.Fn archive_read_support_format_mtree ,
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.Fn archive_read_support_format_rar ,
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.Fn archive_read_support_format_raw ,
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.Fn archive_read_support_format_tar ,
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.Fn archive_read_support_format_xar ,
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.Fn archive_read_support_format_zip
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.Xc
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Enables support---including auto-detection code---for the
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specified archive format.
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For example,
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.Fn archive_read_support_format_tar
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enables support for a variety of standard tar formats, old-style tar,
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ustar, pax interchange format, and many common variants.
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.It Fn archive_read_support_format_all
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Enables support for all available formats except the
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.Dq raw
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format (see below).
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.It Fn archive_read_support_format_by_code
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Enables a single format specified by the format code.
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This can be useful when reading a single archive twice;
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use
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.Fn archive_format
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after reading the first time and pass the resulting code
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to this function to selectively enable only the necessary
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format support.
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Note: In statically-linked executables, this will cause
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your program to include support for every format.
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If executable size is a concern, you may wish to avoid
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using this function.
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.It Fn archive_read_support_format_empty
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Enables support for treating empty files as empty archives.
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Because empty files are valid for several different formats,
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it is not possible to accurately determine a format for
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an empty file based purely on contents.
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So empty files are treated by libarchive as a distinct
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format.
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.It Fn archive_read_support_format_raw
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The
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.Dq raw
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format handler allows libarchive to be used to read arbitrary data.
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It treats any data stream as an archive with a single entry.
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The pathname of this entry is
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.Dq data ;
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all other entry fields are unset.
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This is not enabled by
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.Fn archive_read_support_format_all
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in order to avoid erroneous handling of damaged archives.
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.El
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.\" .Sh EXAMPLE
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.Sh RETURN VALUES
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These functions return
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.Cm ARCHIVE_OK
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on success, or
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.Cm ARCHIVE_FATAL .
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.\"
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.Sh ERRORS
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Detailed error codes and textual descriptions are available from the
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.Fn archive_errno
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and
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.Fn archive_error_string
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functions.
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.\"
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.Sh SEE ALSO
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.Xr tar 1 ,
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.Xr archive_read_data 3 ,
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.Xr archive_read_filter 3 ,
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.Xr archive_read_set_options 3 ,
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.Xr archive_util 3 ,
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.Xr libarchive 3 ,
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.Xr tar 5
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.Sh BUGS
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Many traditional archiver programs treat
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empty files as valid empty archives.
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For example, many implementations of
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.Xr tar 1
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allow you to append entries to an empty file.
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Of course, it is impossible to determine the format of an empty file
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by inspecting the contents, so this library treats empty files as
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having a special
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.Dq empty
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format.
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.Pp
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Using the
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.Dq raw
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handler together with any other handler will often work
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but can produce surprising results.
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