Function create_writeable_stream 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn create_writeable_stream(
    userdata: *mut c_void,
    write_fn: extern "C" fn(*mut c_void, *const u8, usize) -> usize,
    flush_fn: extern "C" fn(*mut c_void) -> i32,
    seek_fn: extern "C" fn(*mut c_void, i64, i32) -> u64,
) -> *mut WriteableStream

Available on crate features capi and encode only.

Create a writeable stream.