/* base64.h -- Encode binary data using printable characters.

   Copyright (C) 2004-2006, 2009-2012 Free Software Foundation, Inc.

   Written by Simon Josefsson.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 2, or (at your option)

   any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, see <http://www.gnu.org/licenses/>.  */

#ifndef BASE64_H

# define BASE64_H

/* Get size_t. */

# include <stddef.h>

/* Get bool. */

# include <stdbool.h>

/*! 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

{

  unsigned int i;

  char buf[4];

};

extern bool isbase64 (char ch);

extern void base64_encode (const char *restrict in, size_t inlen,

                           char *restrict out, size_t outlen);

extern size_t base64_encode_alloc (const char *in, size_t inlen, char **out);

extern void base64_decode_ctx_init (struct base64_decode_context *ctx);

extern bool base64_decode_ctx (struct base64_decode_context *ctx,

                               const char *restrict in, size_t inlen,

                               char *restrict out, size_t *outlen);

extern bool base64_decode_alloc_ctx (struct base64_decode_context *ctx,

                                     const char *in, size_t inlen,

                                     char **out, size_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)

#endif /* BASE64_H */