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489cae63 JC |
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/kernel.h> | |
12 | ||
13 | #define ASCII85_BUFSZ 6 | |
14 | ||
15 | static inline long | |
16 | ascii85_encode_len(long len) | |
17 | { | |
18 | return DIV_ROUND_UP(len, 4); | |
19 | } | |
20 | ||
21 | static inline const char * | |
22 | ascii85_encode(u32 in, char *out) | |
23 | { | |
24 | int i; | |
25 | ||
26 | if (in == 0) | |
27 | return "z"; | |
28 | ||
29 | out[5] = '\0'; | |
30 | for (i = 5; i--; ) { | |
31 | out[i] = '!' + in % 85; | |
32 | in /= 85; | |
33 | } | |
34 | ||
35 | return out; | |
36 | } | |
37 | ||
38 | #endif |