1/* base64.h -- Encode binary data using printable characters.
2 Copyright (C) 2004-2006, 2009-2012 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 Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1, 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 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser 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/* 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 BASE64_LENGTH(inlen) ((((inlen) + 2) / 3) * 4)
30
31struct base64_decode_context
32{
33 unsigned int i;
34 char buf[4];
35};
36
37extern bool isbase64 (char ch) _GL_ATTRIBUTE_CONST;
38
39extern size_t base64_encode_alloc (const char *in, size_t inlen, char **out);
40
41extern void base64_decode_ctx_init (struct base64_decode_context *ctx);
42
43extern bool base64_decode_ctx (struct base64_decode_context *ctx,
44 const char *restrict in, size_t inlen,
45 char *restrict out, size_t *outlen);
46
47extern bool base64_decode_alloc_ctx (struct base64_decode_context *ctx,
48 const char *in, size_t inlen,
49 char **out, size_t *outlen);
50
51#define base64_decode(in, inlen, out, outlen) \
52 base64_decode_ctx (NULL, in, inlen, out, outlen)
53
54#define base64_decode_alloc(in, inlen, out, outlen) \
55 base64_decode_alloc_ctx (NULL, in, inlen, out, outlen)
56
57#endif /* BASE64_H */
58