archive_write_blocksize (3)

Leading comments

Copyright (c) 2003-2011 Tim Kientzle
All rights reserved.

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1. Redistributions of source code must retain the above copyright
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(The comments found at the beginning of the groff file "man3/archive_write_blocksize.3".)

NAME

archive_write_get_bytes_per_block archive_write_set_bytes_per_block archive_write_get_bytes_in_last_block archive_write_set_bytes_in_last_block - functions for creating archives

LIBRARY

Streaming Archive Library (libarchive, -larchive)

SYNOPSIS

In archive.h Ft int Fn archive_write_get_bytes_per_block struct archive * Ft int Fn archive_write_set_bytes_per_block struct archive * int bytes_per_block Ft int Fn archive_write_get_bytes_in_last_block struct archive * Ft int Fn archive_write_set_bytes_in_last_block struct archive * int

DESCRIPTION

Fn archive_write_set_bytes_per_block

Sets the block size used for writing the archive data. Every call to the write callback function, except possibly the last one, will use this value for the length. The default is to use a block size of 10240 bytes. Note that a block size of zero will suppress internal blocking and cause writes to be sent directly to the write callback as they occur.

Fn archive_write_get_bytes_per_block

Retrieve the block size to be used for writing. A value of -1 here indicates that the library should use default values. A value of zero indicates that internal blocking is suppressed.

Fn archive_write_set_bytes_in_last_block

Sets the block size used for writing the last block. If this value is zero, the last block will be padded to the same size as the other blocks. Otherwise, the final block will be padded to a multiple of this size. In particular, setting it to 1 will cause the final block to not be padded. For compressed output, any padding generated by this option is applied only after the compression. The uncompressed data is always unpadded. The default is to pad the last block to the full block size (note that Fn archive_write_open_filename will set this based on the file type). Unlike the other ``set'' functions, this function can be called after the archive is opened.

Fn archive_write_get_bytes_in_last_block

Retrieve the currently-set value for last block size. A value of -1 here indicates that the library should use default values.

RETURN VALUES

Fn archive_write_set_bytes_per_block and Fn archive_write_set_bytes_in_last_block return ARCHIVE_OK on success, or ARCHIVE_FATAL

Fn archive_write_get_bytes_per_block and Fn archive_write_get_bytes_in_last_block return currently configured block size Po -1 indicates the default block size Pc , or ARCHIVE_FATAL

ERRORS

Detailed error codes and textual descriptions are available from the Fn archive_errno and Fn archive_error_string functions.

SEE ALSO

tar(1), libarchive(3), archive_write_set_options3, cpio(5), mtree(5), tar(5)