61 lines
2.1 KiB
C
61 lines
2.1 KiB
C
/* base32.h -- Encode binary data using printable characters.
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Copyright (C) 2004-2006, 2009-2022 Free Software Foundation, Inc.
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Adapted from Simon Josefsson's base64 code by Gijs van Tulder.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#ifndef BASE32_H
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# define BASE32_H
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/* Get idx_t. */
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# include <idx.h>
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/* Get bool. */
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# include <stdbool.h>
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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 BASE32_LENGTH(inlen) ((((inlen) + 4) / 5) * 8)
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struct base32_decode_context
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{
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int i;
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char buf[8];
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};
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extern bool isbase32 (char ch) _GL_ATTRIBUTE_CONST;
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extern void base32_encode (const char *restrict in, idx_t inlen,
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char *restrict out, idx_t outlen);
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extern idx_t base32_encode_alloc (const char *in, idx_t inlen, char **out);
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extern void base32_decode_ctx_init (struct base32_decode_context *ctx);
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extern bool base32_decode_ctx (struct base32_decode_context *ctx,
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const char *restrict in, idx_t inlen,
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char *restrict out, idx_t *outlen);
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extern bool base32_decode_alloc_ctx (struct base32_decode_context *ctx,
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const char *in, idx_t inlen,
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char **out, idx_t *outlen);
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#define base32_decode(in, inlen, out, outlen) \
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base32_decode_ctx (NULL, in, inlen, out, outlen)
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#define base32_decode_alloc(in, inlen, out, outlen) \
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base32_decode_alloc_ctx (NULL, in, inlen, out, outlen)
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#endif /* BASE32_H */
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