/*
 *   Copyright 2003-2004 The Apache Software Foundation.
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */

/*
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * The apr_vsnprintf/apr_snprintf functions are based on, and used with the
 * permission of, the  SIO stdio-replacement strx_* functions by Panos
 * Tsirigotis <panos@alumni.cs.colorado.edu> for xinetd.
 */

/*
 * @file apr_base64.h
 * @brief APR-UTIL Base64 Encoding
 */
#ifndef APR_BASE64_H
#define APR_BASE64_H

/*#include "apu.h"*/
/*#include "apr_general.h"*/

#define APU_DECLARE(x) x

#ifdef __cplusplus
extern "C" {
#endif

/*
 * @defgroup APR_Util_Base64 Base64 Encoding
 * @ingroup APR_Util
 */

/* Simple BASE64 encode/decode functions.
 * 
 * As we might encode binary strings, hence we require the length of
 * the incoming plain source. And return the length of what we decoded.
 *
 * The decoding function takes any non valid char (i.e. whitespace, \0
 * or anything non A-Z,0-9 etc as terminal.
 * 
 * plain strings/binary sequences are not assumed '\0' terminated. Encoded
 * strings are neither. But probably should.
 *
 */

/*
 * Given the length of an un-encrypted string, get the length of the 
 * encrypted string.
 * @param len the length of an unencrypted string.
 * @return the length of the string after it is encrypted
 */ 
APU_DECLARE(int) apr_base64_encode_len(int len);

/*
 * Encode a string using base64encoding.
 * On EBCDIC platforms, data will be converted to UTF-8 prior to encoding. 
 * On non-EBCDIC platforms, data is encoded as-is.
 * @param coded_dst The destination string for the encoded string.
 * @param plain_src The original string in plain text - must be null terminated.
 * @return the length of the encoded string
 */ 
APU_DECLARE(int) apr_base64_encode(char * coded_dst, const char *plain_src);

/*
 * @param coded_dst The destination string for the encoded string.
 * @param plain_src The original string in plain text
 * @param len_plain_src The length of the plain text string
 * @return the length of the encoded string
 */ 
APU_DECLARE(int) apr_base64_encode_binary(char * coded_dst, 
                                        const unsigned char *plain_src,
                                        int len_plain_src);

/*
 * Determine the length of a plain text string given the encoded version
 * @param coded_src The encoded string
 * @return the length of the plain text string
 */ 
APU_DECLARE(int) apr_base64_decode_len(const char * coded_src);

/*
 * Decode a string to plain text
 * @param plain_dst The destination string for the plain text
 * @param coded_src The encoded string 
 * @return the length of the plain text string
 */ 
APU_DECLARE(int) apr_base64_decode(char * plain_dst, const char *coded_src);

/*
 * Decode an EBCDIC string to plain text
 * @param plain_dst The destination string for the plain text
 * @param coded_src The encoded string 
 * @return the length of the plain text string
 */ 
APU_DECLARE(int) apr_base64_decode_binary(unsigned char * plain_dst, 
                                        const char *coded_src);

/* @} */
#ifdef __cplusplus
}
#endif

#endif    /* !APR_BASE64_H */