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
ascii85_encode_len(long len)16 ascii85_encode_len(long len)
17 {
18 	return DIV_ROUND_UP(len, 4);
19 }
20 
21 static inline const char *
ascii85_encode(u32 in,char * out)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
39