| 1 | /* base64.h -- Encode binary data using printable characters.
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| 2 | Copyright (C) 2004-2006, 2009-2016 Free Software Foundation, Inc.
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| 3 | Written by Simon Josefsson.
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| 4 |
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| 5 | This program is free software; you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 3, or (at your option)
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| 8 | any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program; if not, see <http://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | #ifndef BASE64_H
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| 19 | # define BASE64_H
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| 20 |
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| 21 | /* Get size_t. */
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| 22 | # include <stddef.h>
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| 23 |
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| 24 | /* Get bool. */
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| 25 | # include <stdbool.h>
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| 26 |
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| 27 | # ifdef __cplusplus
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| 28 | extern "C" {
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| 29 | # endif
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| 30 |
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| 31 | /* This uses that the expression (n+(k-1))/k means the smallest
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| 32 | integer >= n/k, i.e., the ceiling of n/k. */
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| 33 | # define BASE64_LENGTH(inlen) ((((inlen) + 2) / 3) * 4)
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| 34 |
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| 35 | struct base64_decode_context
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| 36 | {
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| 37 | unsigned int i;
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| 38 | char buf[4];
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| 39 | };
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| 40 |
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| 41 | extern bool isbase64 (char ch) _GL_ATTRIBUTE_CONST;
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| 42 |
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| 43 | extern void base64_encode (const char *restrict in, size_t inlen,
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| 44 | char *restrict out, size_t outlen);
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| 45 |
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| 46 | extern size_t base64_encode_alloc (const char *in, size_t inlen, char **out);
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| 47 |
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| 48 | extern void base64_decode_ctx_init (struct base64_decode_context *ctx);
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| 49 |
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| 50 | extern bool base64_decode_ctx (struct base64_decode_context *ctx,
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| 51 | const char *restrict in, size_t inlen,
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| 52 | char *restrict out, size_t *outlen);
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| 53 |
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| 54 | extern bool base64_decode_alloc_ctx (struct base64_decode_context *ctx,
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| 55 | const char *in, size_t inlen,
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| 56 | char **out, size_t *outlen);
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| 57 |
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| 58 | #define base64_decode(in, inlen, out, outlen) \
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| 59 | base64_decode_ctx (NULL, in, inlen, out, outlen)
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| 60 |
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| 61 | #define base64_decode_alloc(in, inlen, out, outlen) \
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| 62 | base64_decode_alloc_ctx (NULL, in, inlen, out, outlen)
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| 63 |
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| 64 | # ifdef __cplusplus
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| 65 | }
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| 66 | # endif
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| 67 |
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| 68 | #endif /* BASE64_H */
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