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/* base64.h -- Encode binary data using printable characters.
Copyright (C) 2004-2006, 2009-2024 Free Software Foundation, Inc.
Written by Simon Josefsson.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#ifndef BASE64_H
#define BASE64_H
/* This file uses _GL_INLINE_HEADER_BEGIN. */
#if !_GL_CONFIG_H_INCLUDED
#error "Please include config.h first."
#endif
/* Get idx_t. */
#include <idx.h>
/* Pacify GCC in isubase64. */
#if defined __GNUC__ && 4 < __GNUC__ + (3 <= __GNUC_MINOR__)
# pragma GCC diagnostic ignored "-Wtype-limits"
#endif
_GL_INLINE_HEADER_BEGIN
#ifndef BASE64_INLINE
# define BASE64_INLINE _GL_INLINE
#endif
#ifdef __cplusplus
extern "C" {
#endif
/* This uses that the expression (n+(k-1))/k means the smallest
integer >= n/k, i.e., the ceiling of n/k. */
#define BASE64_LENGTH(inlen) ((((inlen) + 2) / 3) * 4)
struct base64_decode_context
{
int i;
char buf[4];
};
extern signed char const base64_to_int[256];
BASE64_INLINE bool
isubase64 (unsigned char ch)
{
return ch < sizeof base64_to_int && 0 <= base64_to_int[ch];
}
BASE64_INLINE bool
isbase64 (char ch)
{
return isubase64 (ch);
}
extern void base64_encode (const char *restrict in, idx_t inlen,
char *restrict out, idx_t outlen);
extern idx_t base64_encode_alloc (const char *in, idx_t inlen, char **out);
/* Initialize decode-context buffer, CTX. */
BASE64_INLINE void
base64_decode_ctx_init (struct base64_decode_context *ctx)
{
ctx->i = 0;
}
extern bool base64_decode_ctx (struct base64_decode_context *ctx,
const char *restrict in, idx_t inlen,
char *restrict out, idx_t *outlen);
extern bool base64_decode_alloc_ctx (struct base64_decode_context *ctx,
const char *in, idx_t inlen,
char **out, idx_t *outlen);
#define base64_decode(in, inlen, out, outlen) \
base64_decode_ctx (NULL, in, inlen, out, outlen)
#define base64_decode_alloc(in, inlen, out, outlen) \
base64_decode_alloc_ctx (NULL, in, inlen, out, outlen)
#ifdef __cplusplus
}
#endif
_GL_INLINE_HEADER_END
#endif /* BASE64_H */
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