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.\" Copyright (c) 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_OPTIONS 3
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.Os
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.Sh NAME
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.Nm archive_read_set_filter_option ,
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.Nm archive_read_set_format_option ,
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.Nm archive_read_set_option ,
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.Nm archive_read_set_options
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.Nd functions controlling options for reading 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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.Ft int
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.Fo archive_read_set_filter_option
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.Fa "struct archive *"
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.Fa "const char *module"
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.Fa "const char *option"
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.Fa "const char *value"
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.Fc
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.Ft int
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.Fo archive_read_set_format_option
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.Fa "struct archive *"
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.Fa "const char *module"
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.Fa "const char *option"
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.Fa "const char *value"
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.Fc
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.Ft int
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.Fo archive_read_set_option
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.Fa "struct archive *"
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.Fa "const char *module"
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.Fa "const char *option"
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.Fa "const char *value"
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.Fc
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.Ft int
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.Fo archive_read_set_options
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.Fa "struct archive *"
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.Fa "const char *options"
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.Fc
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.Sh DESCRIPTION
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These functions provide a way for libarchive clients to configure
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specific read modules.
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.Bl -tag -width indent
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.It Xo
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.Fn archive_read_set_filter_option ,
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.Fn archive_read_set_format_option
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.Xc
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Specifies an option that will be passed to currently-registered
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filters (including decompression filters) or format readers.
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.Pp
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If
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.Ar option
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and
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.Ar value
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are both
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.Dv NULL ,
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these functions will do nothing and
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.Cm ARCHIVE_OK
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will be returned.
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If
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.Ar option
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is
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.Dv NULL
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but
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.Ar value
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is not, these functions will do nothing and
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.Cm ARCHIVE_FAILED
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will be returned.
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.Pp
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If
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.Ar module
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is not
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.Dv NULL ,
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.Ar option
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and
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.Ar value
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will be provided to the filter or reader named
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.Ar module .
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The return value will be that of the module.
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If there is no such module,
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.Cm ARCHIVE_FAILED
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will be returned.
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.Pp
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If
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.Ar module
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is
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.Dv NULL ,
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.Ar option
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and
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.Ar value
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will be provided to every registered module.
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If any module returns
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.Cm ARCHIVE_FATAL ,
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this value will be returned immediately.
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Otherwise,
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.Cm ARCHIVE_OK
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will be returned if any module accepts the option, and
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.Cm ARCHIVE_FAILED
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in all other cases.
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.\"
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.It Xo
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.Fn archive_read_set_option
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.Xc
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Calls
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.Fn archive_read_set_format_option ,
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then
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.Fn archive_read_set_filter_option .
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If either function returns
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.Cm ARCHIVE_FATAL ,
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.Cm ARCHIVE_FATAL
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will be returned
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immediately.
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Otherwise, greater of the two values will be returned.
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.\"
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.It Xo
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.Fn archive_read_set_options
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.Xc
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.Ar options
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is a comma-separated list of options.
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If
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.Ar options
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is
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.Dv NULL
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or empty,
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.Cm ARCHIVE_OK
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will be returned immediately.
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.Pp
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Calls
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.Fn archive_read_set_option
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with each option in turn.
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If any
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.Fn archive_read_set_option
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call returns
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.Cm ARCHIVE_FATAL ,
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.Cm ARCHIVE_FATAL
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will be returned immediately.
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.Pp
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Individual options have one of the following forms:
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.Bl -tag -compact -width indent
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.It Ar option=value
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The option/value pair will be provided to every module.
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Modules that do not accept an option with this name will ignore it.
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.It Ar option
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The option will be provided to every module with a value of
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.Dq 1 .
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.It Ar !option
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The option will be provided to every module with a NULL value.
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.It Ar module:option=value , Ar module:option , Ar module:!option
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As above, but the corresponding option and value will be provided
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only to modules whose name matches
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.Ar module .
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.El
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.El
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.\"
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.Sh OPTIONS
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.Bl -tag -compact -width indent
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.It Format iso9660
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.Bl -tag -compact -width indent
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.It Cm joliet
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Support Joliet extensions.
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Defaults to enabled, use
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.Cm !joliet
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to disable.
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.It Cm rockridge
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Support RockRidge extensions.
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Defaults to enabled, use
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.Cm !rockridge
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to disable.
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.El
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.It Format tar
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.Bl -tag -compact -width indent
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.It Cm compat-2x
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Libarchive 2.x incorrectly encoded Unicode filenames on
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some platforms.
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This option mimics the libarchive 2.x filename handling
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so that such archives can be read correctly.
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.It Cm hdrcharset
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The value is used as a character set name that will be
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used when translating filenames.
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.It Cm mac-ext
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Support Mac OS metadata extension that records data in special
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files beginning with a period and underscore.
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Defaults to enabled on Mac OS, disabled on other platforms.
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Use
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.Cm !mac-ext
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to disable.
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.It Cm read_concatenated_archives
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Ignore zeroed blocks in the archive, which occurs when multiple tar archives
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have been concatenated together. Without this option, only the contents of
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the first concatenated archive would be read.
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.El
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.El
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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 libarchive 3 ,
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.Xr archive_write_set_options 3 ,
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.Xr archive_read 3
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