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