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// -*- C++ -*-
//=============================================================================
/**
* @file Codecs.h
*
* $Id$
*
* @author Krishnakumar B <kitty@cs.wustl.edu>
*
* Codecs is a generic wrapper for various encoding and decoding
* mechanisms. Currently it includes Base64 content transfer-encoding as
* specified by RFC 2045, Multipurpose Internet Mail Extensions (MIME) Part
* One: Format of Internet Message Bodies.
*
*/
//=============================================================================
#ifndef ACE_CODECS_H
#define ACE_CODECS_H
#include /**/ "ace/pre.h"
#include "ace/ACE_export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Basic_Types.h"
#include "ace/Global_Macros.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class ACE_Base64
*
* @brief Encode/Decode a stream of bytes according to Base64 encoding.
*
* This class provides methods to encode or decode a stream of bytes
* to/from Base64 encoding. It doesn't convert the input stream to a
* canonical form before encoding.
*
*/
class ACE_Export ACE_Base64
{
public:
//@{
/**
* Encodes a stream of bytes to Base64 data
*
* @param input Binary data in byte stream.
* @param input_len Length of the byte stream.
* @param output_len Length of the encoded Base64 byte stream.
* @return Encoded Base64 data in byte stream or NULL if input data cannot
* be encoded.
*/
static ACE_Byte* encode (const ACE_Byte* input,
const size_t input_len,
size_t* output_len);
/**
* Decodes a stream of Base64 to bytes data
*
* @param input Encoded Base64 data in byte stream.
* @param output_len Length of the binary byte stream.
* @return Binary data in byte stream or NULL if input data cannot
* be encoded.
*/
static ACE_Byte* decode (const ACE_Byte* input,
size_t* output_len);
/**
* Return the length of the encoded input data
*
* @param input Encoded Base64 data in byte stream.
* @return Length of the encoded Base64 data.
*
*/
static size_t length (const ACE_Byte* input);
//@}
protected:
// Prevent default construction.
ACE_Base64 (void) {}
private:
// Preventing copying and assignment.
ACE_Base64 (ACE_Base64 const &);
ACE_Base64 & operator= (ACE_Base64 const &);
/// Initialize the tables for encoding/decoding.
static void init (void);
private:
/// Alphabet used for decoding i.e decoder_[alphabet_[i = 0..63]] = i
static ACE_Byte decoder_[];
/// Alphabet used to check valid range of encoded input i.e
/// member_[alphabet_[0..63]] = 1
static ACE_Byte member_[];
/// Boolean to denote whether initialization is complete
static bool init_;
};
ACE_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /* ACE_CODECS_H */
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