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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_EXTRACT 3
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.Os
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.Sh NAME
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.Nm archive_read_extract ,
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.Nm archive_read_extract2 ,
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.Nm archive_read_extract_set_progress_callback
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.Nd functions for reading streaming archives
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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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.Fo archive_read_extract
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.Fa "struct archive *"
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.Fa "struct archive_entry *"
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.Fa "int flags"
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.Fc
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.Ft int
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.Fo archive_read_extract2
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.Fa "struct archive *src"
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.Fa "struct archive_entry *"
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.Fa "struct archive *dest"
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.Fc
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.Ft void
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.Fo archive_read_extract_set_progress_callback
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.Fa "struct archive *"
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.Fa "void (*func)(void *)"
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.Fa "void *user_data"
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.Fc
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.Sh DESCRIPTION
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.Bl -tag -compact -width indent
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.It Fn archive_read_extract , Fn archive_read_extract_set_skip_file
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A convenience function that wraps the corresponding
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.Xr archive_write_disk 3
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interfaces.
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The first call to
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.Fn archive_read_extract
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creates a restore object using
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.Xr archive_write_disk_new 3
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and
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.Xr archive_write_disk_set_standard_lookup 3 ,
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then transparently invokes
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.Xr archive_write_disk_set_options 3 ,
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.Xr archive_write_header 3 ,
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.Xr archive_write_data 3 ,
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and
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.Xr archive_write_finish_entry 3
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to create the entry on disk and copy data into it.
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The
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.Va flags
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argument is passed unmodified to
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.Xr archive_write_disk_set_options 3 .
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.It Fn archive_read_extract2
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This is another version of
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.Fn archive_read_extract
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that allows you to provide your own restore object.
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In particular, this allows you to override the standard lookup functions
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using
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.Xr archive_write_disk_set_group_lookup 3 ,
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and
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.Xr archive_write_disk_set_user_lookup 3 .
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Note that
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.Fn archive_read_extract2
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does not accept a
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.Va flags
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argument; you should use
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.Fn archive_write_disk_set_options
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to set the restore options yourself.
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.It Fn archive_read_extract_set_progress_callback
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Sets a pointer to a user-defined callback that can be used
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for updating progress displays during extraction.
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The progress function will be invoked during the extraction of large
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regular files.
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The progress function will be invoked with the pointer provided to this call.
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Generally, the data pointed to should include a reference to the archive
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object and the archive_entry object so that various statistics
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can be retrieved for the progress display.
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.El
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.\"
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.Sh RETURN VALUES
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Most functions return zero on success, non-zero on error.
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The possible return codes include:
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.Cm ARCHIVE_OK
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(the operation succeeded),
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.Cm ARCHIVE_WARN
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(the operation succeeded but a non-critical error was encountered),
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.Cm ARCHIVE_EOF
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(end-of-archive was encountered),
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.Cm ARCHIVE_RETRY
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(the operation failed but can be retried),
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and
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.Cm ARCHIVE_FATAL
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(there was a fatal error; the archive should be closed immediately).
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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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.Sh SEE ALSO
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.Xr tar 1 ,
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.Xr libarchive 3 ,
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.Xr archive_read 3 ,
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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_format 3 ,
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.Xr archive_read_open 3 ,
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.Xr archive_read_set_options 3 ,
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.Xr archive_util 3 ,
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.Xr tar 5
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