1 | /* |
2 | * SPDX-License-Identifier: GPL-2.0 |
3 | * |
4 | * Copyright (c) 2008 Intel Corporation |
5 | * Copyright (c) 2018 The Linux Foundation. All rights reserved. |
6 | */ |
7 | |
8 | #ifndef _ASCII85_H_ |
9 | #define _ASCII85_H_ |
10 | |
11 | #include <linux/math.h> |
12 | #include <linux/types.h> |
13 | |
14 | #define ASCII85_BUFSZ 6 |
15 | |
16 | static inline long |
17 | ascii85_encode_len(long len) |
18 | { |
19 | return DIV_ROUND_UP(len, 4); |
20 | } |
21 | |
22 | static inline const char * |
23 | ascii85_encode(u32 in, char *out) |
24 | { |
25 | int i; |
26 | |
27 | if (in == 0) |
28 | return "z" ; |
29 | |
30 | out[5] = '\0'; |
31 | for (i = 5; i--; ) { |
32 | out[i] = '!' + in % 85; |
33 | in /= 85; |
34 | } |
35 | |
36 | return out; |
37 | } |
38 | |
39 | #endif |
40 | |