Function ZL_getHeaderSize 

pub unsafe extern "C" fn ZL_getHeaderSize(
    src: *const c_void,
    srcSize: usize,
) -> ZL_Report

@brief Gets the size of the OpenZL header.

Useful to determine header overhead.

@param src Source compressed data @param srcSize Size of source data @return Header size in bytes, or error code

@note This is a temporary function, not guaranteed to remain in future versions