57a4b4f178
When querying an object that supports the buffer protocol, that object must now return a typecode (as per binary.[ch]). This does not have to be honoured by the caller, but can be useful for determining element size.
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
#include <assert.h>
|
|
#include <string.h>
|
|
#include "misc.h"
|
|
#include "mpconfig.h"
|
|
#include "qstr.h"
|
|
#include "obj.h"
|
|
#include "builtin.h"
|
|
#include "objtuple.h"
|
|
#include "binary.h"
|
|
|
|
#if MICROPY_ENABLE_MOD_STRUCT
|
|
|
|
STATIC char get_fmt_type(const char **fmt) {
|
|
char t = **fmt;
|
|
switch (t) {
|
|
case '!':
|
|
t = '>';
|
|
break;
|
|
case '@':
|
|
case '=':
|
|
case '<':
|
|
case '>':
|
|
break;
|
|
default:
|
|
return '@';
|
|
}
|
|
// Skip type char
|
|
(*fmt)++;
|
|
return t;
|
|
}
|
|
|
|
STATIC uint calcsize_items(const char *fmt) {
|
|
// TODO
|
|
return strlen(fmt);
|
|
}
|
|
|
|
STATIC mp_obj_t struct_calcsize(mp_obj_t fmt_in) {
|
|
const char *fmt = mp_obj_str_get_str(fmt_in);
|
|
char fmt_type = get_fmt_type(&fmt);
|
|
(void)fmt_type;
|
|
machine_uint_t size;
|
|
for (size = 0; *fmt; fmt++) {
|
|
int sz = mp_binary_get_size(*fmt);
|
|
// TODO
|
|
assert(sz != -1);
|
|
size += sz;
|
|
}
|
|
return MP_OBJ_NEW_SMALL_INT(size);
|
|
}
|
|
MP_DEFINE_CONST_FUN_OBJ_1(struct_calcsize_obj, struct_calcsize);
|
|
|
|
STATIC mp_obj_t struct_unpack(mp_obj_t fmt_in, mp_obj_t data_in) {
|
|
// TODO: "The buffer must contain exactly the amount of data required by the format (len(bytes) must equal calcsize(fmt))."
|
|
const char *fmt = mp_obj_str_get_str(fmt_in);
|
|
char fmt_type = get_fmt_type(&fmt);
|
|
uint size = calcsize_items(fmt);
|
|
mp_obj_tuple_t *res = mp_obj_new_tuple(size, NULL);
|
|
mp_buffer_info_t bufinfo;
|
|
mp_get_buffer_raise(data_in, &bufinfo);
|
|
byte *p = bufinfo.buf;
|
|
|
|
for (uint i = 0; i < size; i++) {
|
|
mp_obj_t item = mp_binary_get_val(fmt_type, *fmt++, &p);
|
|
res->items[i] = item;
|
|
}
|
|
return res;
|
|
}
|
|
MP_DEFINE_CONST_FUN_OBJ_2(struct_unpack_obj, struct_unpack);
|
|
|
|
STATIC const mp_map_elem_t mp_module_struct_globals_table[] = {
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_struct) },
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_calcsize), (mp_obj_t)&struct_calcsize_obj },
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_unpack), (mp_obj_t)&struct_unpack_obj },
|
|
};
|
|
|
|
STATIC const mp_obj_dict_t mp_module_struct_globals = {
|
|
.base = {&mp_type_dict},
|
|
.map = {
|
|
.all_keys_are_qstrs = 1,
|
|
.table_is_fixed_array = 1,
|
|
.used = sizeof(mp_module_struct_globals_table) / sizeof(mp_map_elem_t),
|
|
.alloc = sizeof(mp_module_struct_globals_table) / sizeof(mp_map_elem_t),
|
|
.table = (mp_map_elem_t*)mp_module_struct_globals_table,
|
|
},
|
|
};
|
|
|
|
const mp_obj_module_t mp_module_struct = {
|
|
.base = { &mp_type_module },
|
|
.name = MP_QSTR_struct,
|
|
.globals = (mp_obj_dict_t*)&mp_module_struct_globals,
|
|
};
|
|
|
|
#endif
|