Source/base64.h

   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 */