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/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