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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 | ||
070c4650 AS |
11 | #include <linux/math.h> |
12 | #include <linux/types.h> | |
489cae63 JC |
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 |