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 |
28 | extern "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 | |
35 | struct base64_decode_context |
36 | { |
37 | unsigned int i; |
38 | char buf[4]; |
39 | }; |
40 | |
41 | extern bool isbase64 (char ch) _GL_ATTRIBUTE_CONST; |
42 | |
43 | extern void base64_encode (const char *restrict in, size_t inlen, |
44 | char *restrict out, size_t outlen); |
45 | |
46 | extern size_t base64_encode_alloc (const char *in, size_t inlen, char **out); |
47 | |
48 | extern void base64_decode_ctx_init (struct base64_decode_context *ctx); |
49 | |
50 | extern 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 | |
54 | extern 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 | |