1/* base32.h -- Encode binary data using printable characters.
2   Copyright (C) 2004-2006, 2009-2014 Free Software Foundation, Inc.
3   Adapted from Simon Josefsson's base64 code by Gijs van Tulder.
4
5   This program is free software; you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 3, or (at your option)
8   any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program; if not, see <http://www.gnu.org/licenses/>.  */
17
18#ifndef BASE32_H
19# define BASE32_H
20
21/* Get size_t. */
22# include <stddef.h>
23
24/* Get bool. */
25# include <stdbool.h>
26
27/* This uses that the expression (n+(k-1))/k means the smallest
28   integer >= n/k, i.e., the ceiling of n/k.  */
29# define BASE32_LENGTH(inlen) ((((inlen) + 4) / 5) * 8)
30
31struct base32_decode_context
32{
33  unsigned int i;
34  char buf[8];
35};
36
37extern bool isbase32 (char ch);
38
39extern void base32_encode (const char *restrict in, size_t inlen,
40                           char *restrict out, size_t outlen);
41
42extern size_t base32_encode_alloc (const char *in, size_t inlen, char **out);
43
44extern void base32_decode_ctx_init (struct base32_decode_context *ctx);
45
46extern bool base32_decode_ctx (struct base32_decode_context *ctx,
47                               const char *restrict in, size_t inlen,
48                               char *restrict out, size_t *outlen);
49
50extern bool base32_decode_alloc_ctx (struct base32_decode_context *ctx,
51                                     const char *in, size_t inlen,
52                                     char **out, size_t *outlen);
53
54#define base32_decode(in, inlen, out, outlen) \
55        base32_decode_ctx (NULL, in, inlen, out, outlen)
56
57#define base32_decode_alloc(in, inlen, out, outlen) \
58        base32_decode_alloc_ctx (NULL, in, inlen, out, outlen)
59
60#endif /* BASE32_H */
61