1/* base64.h -- Encode binary data using printable characters.
2 Copyright (C) 2004-2006, 2009-2013 Free Software Foundation, Inc.
3 Written by Simon Josefsson.
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 BASE64_H
19# define BASE64_H
20
21/* Get size_t. */
22# include <stddef.h>
23
24/* Get bool. */
25# include <stdbool.h>
26
27# ifdef __cplusplus
28extern "C" {
29# endif
30
31/* This uses that the expression (n+(k-1))/k means the smallest
32 integer >= n/k, i.e., the ceiling of n/k. */
33# define BASE64_LENGTH(inlen) ((((inlen) + 2) / 3) * 4)
34
35struct base64_decode_context
36{
37 unsigned int i;
38 char buf[4];
39};
40
41extern bool isbase64 (char ch) _GL_ATTRIBUTE_CONST;
42
43extern void base64_encode (const char *restrict in, size_t inlen,
44 char *restrict out, size_t outlen);
45
46extern size_t base64_encode_alloc (const char *in, size_t inlen, char **out);
47
48extern void base64_decode_ctx_init (struct base64_decode_context *ctx);
49
50extern bool base64_decode_ctx (struct base64_decode_context *ctx,
51 const char *restrict in, size_t inlen,
52 char *restrict out, size_t *outlen);
53
54extern bool base64_decode_alloc_ctx (struct base64_decode_context *ctx,
55 const char *in, size_t inlen,
56 char **out, size_t *outlen);
57
58#define base64_decode(in, inlen, out, outlen) \
59 base64_decode_ctx (NULL, in, inlen, out, outlen)
60
61#define base64_decode_alloc(in, inlen, out, outlen) \
62 base64_decode_alloc_ctx (NULL, in, inlen, out, outlen)
63
64# ifdef __cplusplus
65}
66# endif
67
68#endif /* BASE64_H */
69