char const* nsmp_field_unpack(
    char const *const start_ptr,
    nsmp_type const type,
    nsmp_packet_field *const field
) {
    int size;
    char const *ptr = start_ptr;
    field->type = type;

    if(field->type != nsmp_string) {
        size = nsmp_type_size[type]
    } else {
            nsmp_packet_field len;
            ptr = nsmp_field_upack(ptr, nsmp_uint16, &len);
            size = *(uint16_t *) len.val;
            free(len.val);
    }
    field->val = malloc(size);

    switch(field->type) {
        case nsmp_string:
            strcpy((char *) field->val, ptr);
            break;
        case nsmp_int8:
        case nsmp_uint8:
            *(uint8_t *) field->val = *(uint8_t *) ptr;
            break;
        case nsmp_int16:
        case nsmp_uint16:
            *(uint16_t *) field->val = ntohs(*(uint16_t *) ptr);
            break;
        case nsmp_int32:
        case nsmp_uint32:
        case nsmp_float:
            *(uint32_t *) field->val = ntohl(*(uint32_t *) ptr);
            break;
    }

    ptr += size;
    return ptr;
}