py/dynruntime: Add mp_get_buffer.

Signed-off-by: Damien George <damien@micropython.org>

py/dynruntime.h

@@ -125,7 +125,8 @@ static inline void *m_realloc_dyn(void *ptr, size_t new_num_bytes) {
 #define mp_obj_get_int_truncated(o)         (mp_fun_table.native_from_obj(o, MP_NATIVE_TYPE_UINT))
 #define mp_obj_str_get_str(s)               (mp_obj_str_get_data_dyn((s), NULL))
 #define mp_obj_str_get_data(o, len)         (mp_obj_str_get_data_dyn((o), (len)))
-#define mp_get_buffer_raise(o, bufinfo, fl) (mp_fun_table.get_buffer_raise((o), (bufinfo), (fl)))
+#define mp_get_buffer(o, bufinfo, fl)       (mp_fun_table.get_buffer((o), (bufinfo), (fl)))
+#define mp_get_buffer_raise(o, bufinfo, fl) (mp_fun_table.get_buffer((o), (bufinfo), (fl) | MP_BUFFER_RAISE_IF_UNSUPPORTED))
 #define mp_get_stream_raise(s, flags)       (mp_fun_table.get_stream_raise((s), (flags)))
 #define mp_obj_is_true(o)                   (mp_fun_table.native_from_obj(o, MP_NATIVE_TYPE_BOOL))
 

py/nativeglue.c

@@ -328,7 +328,7 @@ const mp_fun_table_t mp_fun_table = {
     mp_obj_new_float_from_d,
     mp_obj_get_float_to_f,
     mp_obj_get_float_to_d,
-    mp_get_buffer_raise,
+    mp_get_buffer,
     mp_get_stream_raise,
     &mp_plat_print,
     &mp_type_type,

py/nativeglue.h

@@ -154,7 +154,7 @@ typedef struct _mp_fun_table_t {
     mp_obj_t (*obj_new_float_from_d)(double d);
     float (*obj_get_float_to_f)(mp_obj_t o);
     double (*obj_get_float_to_d)(mp_obj_t o);
-    void (*get_buffer_raise)(mp_obj_t obj, mp_buffer_info_t *bufinfo, mp_uint_t flags);
+    bool (*get_buffer)(mp_obj_t obj, mp_buffer_info_t *bufinfo, mp_uint_t flags);
     const mp_stream_p_t *(*get_stream_raise)(mp_obj_t self_in, int flags);
     const mp_print_t *plat_print;
     const mp_obj_type_t *type_type;