CustomStreamHandler typedef
CustomStreamHandler = Pointer<NativeFunction<ssize_t Function(Pointer<UnsignedChar> , Size, Pointer<Void> )> >
Implementation
typedef CustomStreamHandler = ffi.Pointer<
ffi.NativeFunction<
ssize_t Function(
ffi.Pointer<ffi.UnsignedChar>, ffi.Size, ffi.Pointer<ffi.Void>)>>;