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ARCHIVE_WRITE_BLOCKSI... BSD Library Functions Manual
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ARCHIVE_WRITE_BLOCKSI...
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NAME
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archive_write_get_bytes_per_block,
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archive_write_set_bytes_per_block,
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archive_write_get_bytes_in_last_block,
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archive_write_set_bytes_in_last_block —
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functions for creating archives
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LIBRARY
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Streaming Archive Library
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(libarchive, -larchive)
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SYNOPSIS
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#include
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<archive.h>
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int
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archive_write_get_bytes_per_block(struct archive *);
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int
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archive_write_set_bytes_per_block(struct archive *,
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int bytes_per_block);
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int
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archive_write_get_bytes_in_last_block(struct archive *);
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int
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archive_write_set_bytes_in_last_block(struct archive *,
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int);
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DESCRIPTION
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archive_write_set_bytes_per_block()
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Sets the block size used for
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writing the archive data. Every call to the write callback
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function, except possibly the last one, will use this value
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for the length. The default is to use a block size of 10240
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bytes. Note that a block size of zero will suppress internal
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blocking and cause writes to be sent directly to the write
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callback as they occur.
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archive_write_get_bytes_per_block()
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Retrieve the block size to be
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used for writing. A value of -1 here indicates that the
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library should use default values. A value of zero indicates
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that internal blocking is suppressed.
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archive_write_set_bytes_in_last_block()
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Sets the block size used for
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writing the last block. If this value is zero, the last
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block will be padded to the same size as the other blocks.
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Otherwise, the final block will be padded to a multiple of
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this size. In particular, setting it to 1 will cause the
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final block to not be padded. For compressed output, any
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padding generated by this option is applied only after the
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compression. The uncompressed data is always unpadded. The
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default is to pad the last block to the full block size
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(note that archive_write_open_filename() will set
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this based on the file type). Unlike the other
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’’set’’ functions, this function can
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be called after the archive is opened.
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archive_write_get_bytes_in_last_block()
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Retrieve the currently-set
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value for last block size. A value of -1 here indicates that
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the library should use default values.
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RETURN VALUES
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archive_write_set_bytes_per_block()
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and archive_write_set_bytes_in_last_block() return
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ARCHIVE_OK on success, or ARCHIVE_FATAL.
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archive_write_get_bytes_per_block()
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and archive_write_get_bytes_in_last_block() return
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currently configured block size (
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-1 indicates the default block size ), or
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ARCHIVE_FATAL.
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ERRORS
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Detailed error codes and textual
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descriptions are available from the archive_errno()
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and archive_error_string() functions.
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SEE ALSO
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tar(1), libarchive(3),
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archive_write_set_options(3), cpio(5), mtree(5), tar(5)
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BSD
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February 2, 2012 BSD
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</body>
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</html>
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