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extmod/moductypes: Implement buffer protocol. 

This is required to write structures to files, pass to FFI functions,
etc.
This commit is contained in:
Paul Sokolovsky 2015-10-26 01:02:27 +03:00
parent 79f404a287
commit 393d0c1679
1 changed files with 13 additions and 0 deletions
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13
extmod/moductypes.c
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@ -556,6 +556,18 @@ STATIC mp_obj_t uctypes_struct_subscr(mp_obj_t self_in, mp_obj_t index_in, mp_ob
}
}
STATIC mp_int_t uctypes_get_buffer(mp_obj_t self_in, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
(void)flags;
mp_obj_uctypes_struct_t *self = self_in;
mp_uint_t max_field_size = 0;
mp_uint_t size = uctypes_struct_size(self->desc, &max_field_size);
bufinfo->buf = self->addr;
bufinfo->len = size;
bufinfo->typecode = BYTEARRAY_TYPECODE;
return 0;
}
/// \function addressof()
/// Return address of object's data (applies to object providing buffer
/// interface).
@ -592,6 +604,7 @@ STATIC const mp_obj_type_t uctypes_struct_type = {
.make_new = uctypes_struct_make_new,
.attr = uctypes_struct_attr,
.subscr = uctypes_struct_subscr,
.buffer_p = { .get_buffer = uctypes_get_buffer },
};
STATIC const mp_map_elem_t mp_module_uctypes_globals_table[] = {