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+ARCHIVE_WRITE_BLOCKSIZE(3) manual page 
+== 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 == 
+'''<nowiki>#include <archive.h></nowiki>''' 
+<br> 
+''int'' 
+<br> 
+'''archive_write_get_bytes_per_block'''(''struct archive *''); 
+<br> 
+''int'' 
+<br> 
+'''archive_write_set_bytes_per_block'''(''struct archive *'', ''int bytes_per_block''); 
+<br> 
+''int'' 
+<br> 
+'''archive_write_get_bytes_in_last_block'''(''struct archive *''); 
+<br> 
+''int'' 
+<br> 
+'''archive_write_set_bytes_in_last_block'''(''struct archive *'', ''int''); 
+== DESCRIPTION == 
+<dl> 
+<dt>'''archive_write_set_bytes_per_block'''()</dt><dd> 
+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. 
+</dd><dt>'''archive_write_get_bytes_per_block'''()</dt><dd> 
+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. 
+</dd><dt>'''archive_write_set_bytes_in_last_block'''()</dt><dd> 
+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 
+'''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. 
+</dd><dt>'''archive_write_get_bytes_in_last_block'''()</dt><dd> 
+Retrieve the currently-set value for last block size. 
+A value of -1 here indicates that the library should use default values. 
+</dd></dl> 
+== RETURN VALUES == 
+'''archive_write_set_bytes_per_block'''() 
+and 
+'''archive_write_set_bytes_in_last_block'''() 
+return 
+'''ARCHIVE_OK''' 
+on success, or 
+'''ARCHIVE_FATAL'''. 
+
+'''archive_write_get_bytes_per_block'''() 
+and 
+'''archive_write_get_bytes_in_last_block'''() 
+return currently configured block size 
+Po 
+```text
+-1 
+```
+indicates the default block size 
+Pc, 
+or 
+'''ARCHIVE_FATAL'''. 
+== ERRORS == 
+Detailed error codes and textual descriptions are available from the 
+'''archive_errno'''() 
+and 
+'''archive_error_string'''() 
+functions. 
+== SEE ALSO == 
+[[ManPageBsdtar1]], 
+[[ManPageibarchive3]], 
+[[ManPagerchiveriteetptions3]], 
+[[ManPageCpio5]], 
+[[ManPageMtree5]], 
+[[ManPageTar5]]