text: /* base64.h -- Encode binary data using printable characters.
     Copyright (C) 2004, 2005 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 Lesser General Public License as published by
     the Free Software Foundation; either version 2.1, 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 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, 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 */
  