py: Add mp_get_stream_raise to factor out check for stream methods.
diff --git a/py/stream.h b/py/stream.h
index b3958d3..0471777 100644
--- a/py/stream.h
+++ b/py/stream.h
@@ -37,6 +37,13 @@
MP_DECLARE_CONST_FUN_OBJ(mp_stream_seek_obj);
MP_DECLARE_CONST_FUN_OBJ(mp_stream_tell_obj);
+// these are for mp_get_stream_raise and can be or'd together
+#define MP_STREAM_OP_READ (1)
+#define MP_STREAM_OP_WRITE (2)
+#define MP_STREAM_OP_IOCTL (4)
+
+const mp_stream_p_t *mp_get_stream_raise(mp_obj_t self_in, int flags);
+
// Iterator which uses mp_stream_unbuffered_readline_obj
mp_obj_t mp_stream_unbuffered_iter(mp_obj_t self);