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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_WRITE_BLOCKSIZE 3
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.Os
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.Sh NAME
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.Nm archive_write_get_bytes_per_block ,
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.Nm archive_write_set_bytes_per_block ,
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.Nm archive_write_get_bytes_in_last_block ,
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.Nm archive_write_set_bytes_in_last_block
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.Nd functions for creating 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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.Fn archive_write_get_bytes_per_block "struct archive *"
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.Ft int
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.Fn archive_write_set_bytes_per_block "struct archive *" "int bytes_per_block"
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.Ft int
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.Fn archive_write_get_bytes_in_last_block "struct archive *"
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.Ft int
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.Fn archive_write_set_bytes_in_last_block "struct archive *" "int"
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.Sh DESCRIPTION
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.Bl -tag -width indent
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.It Fn archive_write_set_bytes_per_block
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Sets the block size used for writing the archive data.
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Every call to the write callback function, except possibly the last one, will
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use this value for the length.
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The default is to use a block size of 10240 bytes.
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Note that a block size of zero will suppress internal blocking
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and cause writes to be sent directly to the write callback as they occur.
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.It Fn archive_write_get_bytes_per_block
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Retrieve the block size to be used for writing.
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A value of -1 here indicates that the library should use default values.
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A value of zero indicates that internal blocking is suppressed.
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.It Fn archive_write_set_bytes_in_last_block
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Sets the block size used for writing the last block.
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If this value is zero, the last block will be padded to the same size
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as the other blocks.
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Otherwise, the final block will be padded to a multiple of this size.
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In particular, setting it to 1 will cause the final block to not be padded.
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For compressed output, any padding generated by this option
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is applied only after the compression.
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The uncompressed data is always unpadded.
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The default is to pad the last block to the full block size (note that
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.Fn archive_write_open_filename
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will set this based on the file type).
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Unlike the other
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.Dq set
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functions, this function can be called after the archive is opened.
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.It Fn archive_write_get_bytes_in_last_block
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Retrieve the currently-set value for last block size.
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A value of -1 here indicates that the library should use default values.
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.El
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.\" .Sh EXAMPLE
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.Sh RETURN VALUES
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.Fn archive_write_set_bytes_per_block
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and
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.Fn archive_write_set_bytes_in_last_block
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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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.Pp
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.Fn archive_write_get_bytes_per_block
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and
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.Fn archive_write_get_bytes_in_last_block
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return currently configured block size
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.Po
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.Li -1
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indicates the default block size
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.Pc ,
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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_write_set_options 3 ,
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.Xr libarchive 3 ,
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.Xr cpio 5 ,
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.Xr mtree 5 ,
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.Xr tar 5
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