Data URI sub-components.
Character set portion of the meta preamble. Starts with "charset=", or is undefined.
Extension portion of the meta preamble. Can be 'base64', or undefined.
Media type portion of the meta preamble. If undefined, assume "text/plain".
Meta data preamble of the data URI.
Index of the first character of the payload.
Original data URI that has been parsed.
Data URI sub-components.