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 39