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

     2    Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.

     3    Written by Simon Josefsson.

     4 

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

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

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

     8    any later version.

     9 

    10    This program is distributed in the hope that it will be useful,

    11    but WITHOUT ANY WARRANTY; without even the implied warranty of

    12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    13    GNU General Public License for more details.

    14 

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

    16    along with this program; if not, write to the Free Software Foundation,

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

    18 

    19 #ifndef BASE64_H

    20 # define BASE64_H

    21 

    22 /* Get size_t. */

    23 # include <stddef.h>

    24 

    25 /* Get bool. */

    26 # include <stdbool.h>

    27 

    28 /* This uses that the expression (n+(k-1))/k means the smallest

    29    integer >= n/k, i.e., the ceiling of n/k.  */

    30 # define BASE64_LENGTH(inlen) ((((inlen) + 2) / 3) * 4)

    31 

    32 extern bool isbase64 (char ch);

    33 

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

    35 			   char *restrict out, size_t outlen);

    36 

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

    38 

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

    40 			   char *restrict out, size_t *outlen);

    41 

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

    43 				 char **out, size_t *outlen);

    44 

    45 #endif /* BASE64_H */