include/linux/ascii85.h

   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