xref: /openbmc/linux/include/linux/ascii85.h (revision 070c4650)
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
ascii85_encode_len(long len)17 ascii85_encode_len(long len)
18 {
19 	return DIV_ROUND_UP(len, 4);
20 }
21 
22 static inline const char *
ascii85_encode(u32 in,char * out)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