Function croaring_sys::roaring_bitmap_portable_size_in_bytes

pub unsafe extern "C" fn roaring_bitmap_portable_size_in_bytes(
    ra: *const roaring_bitmap_t
) -> usize

How many bytes are required to serialize this bitmap (meant to be compatible with Java and Go versions). See format specification at https://github.com/RoaringBitmap/RoaringFormatSpec