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.\" Copyright (c) 2003-2011 Tim Kientzle
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd August 14, 2014
.Dt ARCHIVE_READ_FILTER 3
.Os
.Sh NAME
.Nm archive_read_support_filter_all ,
.Nm archive_read_support_filter_bzip2 ,
.Nm archive_read_support_filter_compress ,
.Nm archive_read_support_filter_gzip ,
.Nm archive_read_support_filter_lz4 ,
.Nm archive_read_support_filter_lzma ,
.Nm archive_read_support_filter_none ,
.Nm archive_read_support_filter_rpm ,
.Nm archive_read_support_filter_uu ,
.Nm archive_read_support_filter_xz ,
.Nm archive_read_support_filter_program ,
.Nm archive_read_support_filter_program_signature
.Nd functions for reading streaming archives
.\"
.Sh LIBRARY
Streaming Archive Library (libarchive, -larchive)
.Sh SYNOPSIS
.In archive.h
.Ft int
.Fn archive_read_support_filter_all "struct archive *"
.Ft int
.Fn archive_read_support_filter_bzip2 "struct archive *"
.Ft int
.Fn archive_read_support_filter_compress "struct archive *"
.Ft int
.Fn archive_read_support_filter_gzip "struct archive *"
.Ft int
.Fn archive_read_support_filter_lz4 "struct archive *"
.Ft int
.Fn archive_read_support_filter_lzma "struct archive *"
.Ft int
.Fn archive_read_support_filter_lzop "struct archive *"
.Ft int
.Fn archive_read_support_filter_none "struct archive *"
.Ft int
.Fn archive_read_support_filter_rpm "struct archive *"
.Ft int
.Fn archive_read_support_filter_uu "struct archive *"
.Ft int
.Fn archive_read_support_filter_xz "struct archive *"
.Ft int
.Fo archive_read_support_filter_program
.Fa "struct archive *"
.Fa "const char *cmd"
.Fc
.Ft int
.Fo archive_read_support_filter_program_signature
.Fa "struct archive *"
.Fa "const char *cmd"
.Fa "const void *signature"
.Fa "size_t signature_length"
.Fc
.\"
.Sh DESCRIPTION
.Bl -tag -compact -width indent
.It Xo
.Fn archive_read_support_filter_bzip2 ,
.Fn archive_read_support_filter_compress ,
.Fn archive_read_support_filter_gzip ,
.Fn archive_read_support_filter_lz4 ,
.Fn archive_read_support_filter_lzma ,
.Fn archive_read_support_filter_lzop ,
.Fn archive_read_support_filter_none ,
.Fn archive_read_support_filter_rpm ,
.Fn archive_read_support_filter_uu ,
.Fn archive_read_support_filter_xz
.Xc
Enables auto-detection code and decompression support for the
specified compression.
These functions may fall back on external programs if an appropriate
library was not available at build time.
Decompression using an external program is usually slower than
decompression through built-in libraries.
Note that
.Dq none
is always enabled by default.
.It Fn archive_read_support_filter_all
Enables all available decompression filters.
.It Fn archive_read_support_filter_program
Data is fed through the specified external program before being dearchived.
Note that this disables automatic detection of the compression format,
so it makes no sense to specify this in conjunction with any other
decompression option.
.It Fn archive_read_support_filter_program_signature
This feeds data through the specified external program
but only if the initial bytes of the data match the specified
signature value.
.El
.\"
.\". Sh EXAMPLE
.\"
.Sh RETURN VALUES
These functions return
.Cm ARCHIVE_OK
if the compression is fully supported,
.Cm ARCHIVE_WARN
if the compression is supported only through an external program.
.Pp
.Fn archive_read_support_filter_none
always succeeds.
.\"
.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 libarchive 3 ,
.Xr archive_read 3 ,
.Xr archive_read_data 3 ,
.Xr archive_read_format 3 ,
.Xr archive_read_format 3
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