struct asn1_specification {
	uint8_t len;
	uint8_t elem[1];
};




asn1_error_t asn1_decode(uint8_t *asn1_data, size_t asn1_len, asn1_obj_t *objs, size_t *objs_ret, struct asn1_specification *spec){
	uint8_t *asn1_current = asn1_data;			// set current to start of data to decode
	uint8_t *asn1_end = asn1_current + asn1_len;
	if(*asn1_current == 0) asn1_current++;
	size_t i;

	for(i = 0; asn1_current < asn1_end; i++){		// loop until iter count hit. Break manually if done.
		asn1_obj_t *node_o = &objs[i];
		uint8_t spec_tag_form = (spec == NULL) ? 0 : spec->elem[i];
		uint8_t tag = *asn1_current++;
		//node_o->tag = (*asn1_current++) & 0b11111;		// get numeric tag id
		uint8_t byte_2nd = *asn1_current++;	// get byte 2. Can be size or can be size of size
		node_o->len = 0;
		if((byte_2nd>>7) & 1){			// if bit 7 of byte is set, this is a size word length
			uint8_t size_len = byte_2nd & 0x7f;
			if(size_len > 3) return ASN1_ARCH_BAD_LEN;			// due to device limits, seq len limited to u24.
			rmemcpy((uint8_t*)&node_o->len, asn1_current, size_len);
			asn1_current += size_len;
		}
		else									// else, this is a size byte
			node_o->len = byte_2nd;

		// pull out tag with associated flags
		node_o->tag = tag & 0b11111;
		node_o->f_constr = (tag>>5 & 1);
		node_o->f_class = (tag>>6 & 0b11);

		// retrieve data addr and length
		node_o->data = asn1_current;
		asn1_current += node_o->len;

		// if the constructed flag is set, this element may contain other encoded types
		if((node_o->f_constr) || (spec_tag_form == 1)){
			size_t node_interior_len;
			if(asn1_decode(node_o->data, node_o->len, node_o, &node_interior_len, NULL) == ASN1_OK){
				i--;
				i += node_interior_len;
			}
		}

	}
	*objs_ret = i;
	if (spec != NULL) {if(i != spec->len) return ASN1_SPEC_MISMATCH;}
	return ASN1_OK;
}