base64.h

/*
 * Copyright (C) 2014 Hochschule für Angewandte Wissenschaften Hamburg (HAW)
 * Copyright (C) 2014 Martin Landsmann <Martin.Landsmann@HAW-Hamburg.de>
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#include <stddef.h> /* for size_t */
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define BASE64_SUCCESS                (0)  
#define BASE64_ERROR_BUFFER_OUT       (-1) 
#define BASE64_ERROR_BUFFER_OUT_SIZE  (-2) 
#define BASE64_ERROR_DATA_IN          (-3) 
#define BASE64_ERROR_DATA_IN_SIZE     (-4) 

static inline size_t base64_estimate_decode_size(size_t base64_in_size)
{
    return (((base64_in_size + 3) / 4) * 3);
}

static inline size_t base64_estimate_encode_size(size_t data_in_size)
{
    return (4 * ((data_in_size + 2) / 3));
}

int base64_encode(const void *data_in, size_t data_in_size,
                  void *base64_out, size_t *base64_out_size);

int base64url_encode(const void *data_in, size_t data_in_size,
                     void *base64_out, size_t *base64_out_size);

int base64_decode(const void *base64_in, size_t base64_in_size,
                  void *data_out, size_t *data_out_size);
 
#ifdef __cplusplus
}
#endif