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

   Copyright (C) 2004, 2005, 2006 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, write to the Free Software Foundation,

   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

#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)

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 bool base64_decode (const char *restrict in, size_t inlen,

			   char *restrict out, size_t *outlen);

extern bool base64_decode_alloc (const char *in, size_t inlen,

				 char **out, size_t *outlen);

#endif /* BASE64_H */