Get the length of the metadata block at the current position. This
avoids reading the actual block data which can save time for large
blocks.
\param iterator A pointer to an existing initialized iterator.
\assert
\code iterator != NULL \endcode
\a iterator has been successfully initialized with
FLAC__metadata_simple_iterator_init()
\retval uint
The length of the metadata block at the current iterator position.
The is same length as that in the
<a href="http://flac.sourceforge.net/format.html#metadata_block_header">metadata block header</a>,
i.e. the length of the metadata body that follows the header.
Get the length of the metadata block at the current position. This avoids reading the actual block data which can save time for large blocks.
\param iterator A pointer to an existing initialized iterator. \assert \code iterator != NULL \endcode \a iterator has been successfully initialized with FLAC__metadata_simple_iterator_init() \retval uint The length of the metadata block at the current iterator position. The is same length as that in the <a href="http://flac.sourceforge.net/format.html#metadata_block_header">metadata block header</a>, i.e. the length of the metadata body that follows the header.