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76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/* base64.h -- Encode binary data using printable characters.
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Copyright (C) 2004-2006, 2009-2023 Free Software Foundation, Inc.
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Written by Simon Josefsson.
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(NB: I modified the original GPL boilerplate here to LGPLv2+. This
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is because of the weird way that gnulib uses licenses, where the
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real license is covered in the modules/X file. The real license
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for this file is LGPLv2+, not GPL. - RWMJ)
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef BASE64_H
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# define BASE64_H
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/* Get size_t. */
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# include <stddef.h>
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/* Get bool. */
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# include <stdbool.h>
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# ifdef __cplusplus
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extern "C" {
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# endif
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/* This uses that the expression (n+(k-1))/k means the smallest
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integer >= n/k, i.e., the ceiling of n/k. */
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# define BASE64_LENGTH(inlen) ((((inlen) + 2) / 3) * 4)
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struct base64_decode_context
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{
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unsigned int i;
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char buf[4];
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};
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extern bool isbase64 (char ch);
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extern void base64_encode (const char *restrict in, size_t inlen,
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char *restrict out, size_t outlen);
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extern size_t base64_encode_alloc (const char *in, size_t inlen, char **out);
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extern void base64_decode_ctx_init (struct base64_decode_context *ctx);
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extern bool base64_decode_ctx (struct base64_decode_context *ctx,
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const char *restrict in, size_t inlen,
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char *restrict out, size_t *outlen);
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extern bool base64_decode_alloc_ctx (struct base64_decode_context *ctx,
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const char *in, size_t inlen,
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char **out, size_t *outlen);
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#define base64_decode(in, inlen, out, outlen) \
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base64_decode_ctx (NULL, in, inlen, out, outlen)
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#define base64_decode_alloc(in, inlen, out, outlen) \
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base64_decode_alloc_ctx (NULL, in, inlen, out, outlen)
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# ifdef __cplusplus
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}
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# endif
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#endif /* BASE64_H */
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