Function apr_base64_decode_binary 

pub unsafe extern "C" fn apr_base64_decode_binary(
    plain_dst: *mut c_uchar,
    coded_src: *const c_char,
) -> c_int

Decode an EBCDIC string to plain text @param plain_dst The destination string for the plain text @param coded_src The encoded string @return the length of the plain text string