# lv_utils.h (/api/misc/lv_utils_h)
Functions [#functions]
lv_utils_bsearch [#lv_utils_bsearch]
Searches base\[0] to base\[n - 1] for an item that matches \*key.
```c title=" " lineNumbers=1
void * lv_utils_bsearch(const void *key, const void *base, size_t n, size_t size, int(*cmp)(const void *pRef, const void *pElement))
```
Parameters
| Name | Type | Description |
| ------ | ------------------------------------------------ | ---------------------------------------------------------------------------------------------- |
| `key` | `const void *` | Pointer to item being searched for |
| `base` | `const void *` | Pointer to first element to search |
| `n` | | Number of elements |
| `size` | | Size of each element |
| `cmp` | `int(*)(const void *pRef, const void *pElement)` | Pointer to comparison function (see unicode\_list\_compare() as a comparison function example) |
**Returns:** `void *` — a pointer to a matching item, or NULL if none exists.
The function cmp must return negative if it's first argument (the search key) is less that it's second (a table entry), zero if equal, and positive if greater.
Items in the array must be in ascending order.
lv_draw_buf_save_to_file [#lv_draw_buf_save_to_file]
Save a draw buf to a file
```c title=" " lineNumbers=1
lv_result_t lv_draw_buf_save_to_file(const lv_draw_buf_t *draw_buf, const char *path)
```
Parameters
| Name | Type | Description |
| ---------- | ---------------------------------------------------------------- | ------------------------ |
| `draw_buf` | | pointer to a draw buffer |
| `path` | `const char *` | path to the file to save |
**Returns:** — LV\_RESULT\_OK: success; LV\_RESULT\_INVALID: error
lv_swap_bytes_32 [#lv_swap_bytes_32]
Reverse the order of the bytes in a 32-bit value.
```c title=" " lineNumbers=1
static uint32_t lv_swap_bytes_32(uint32_t x)
```
Parameters
| Name | Type | Description |
| ---- | --------------------------- | --------------- |
| `x` | | a 32-bit value. |
**Returns:** — the value `x` with reversed byte-order.
lv_swap_bytes_16 [#lv_swap_bytes_16]
Reverse the order of the bytes in a 16-bit value.
```c title=" " lineNumbers=1
static uint16_t lv_swap_bytes_16(uint16_t x)
```
Parameters
| Name | Type | Description |
| ---- | --------------------------- | --------------- |
| `x` | | a 16-bit value. |
**Returns:** — the value `x` with reversed byte-order.
Dependencies [#dependencies]