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/* This file is part of the OpenLB library
*
* Copyright (C) 2007 Jonas Latt
* E-mail contact: info@openlb.net
* The most recent release of OpenLB can be downloaded at
* <http://www.openlb.net/>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, 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 General Public License for more details.
*
* You should have received a copy of the GNU 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.
*/
/* Acknowledgment: The strategy adopted here to encode
* and decode Base64, and in particular the expression of the
* arrays Base64Encoder::enc64 and Base64Decoder::dec64,
* is inspired by the open source library b64 by Bob Trower,
* which is distributed with a MIT license at the address
* http://base64.sourceforge.net/b64.c
*/
#ifndef BASE64_H
#define BASE64_H
#include <iosfwd>
namespace olb {
template<typename T>
class Base64Encoder {
public:
Base64Encoder(std::ostream& ostr_, size_t fullLength_);
void encode(const T* data, size_t length);
private:
void fillOverflow(const unsigned char* charData, size_t charLength, size_t& pos);
void flushOverflow();
void writeSize();
void encodeBlock( const unsigned char* data);
void encodeUnfinishedBlock( const unsigned char* data, int length);
private:
static const char enc64[65];
private:
std::ostream& ostr;
size_t charFullLength;
size_t numWritten;
int numOverflow;
unsigned char overflow[3];
};
template<typename T>
class Base64Decoder {
public:
Base64Decoder(std::istream& istr_, size_t fullLength_);
void decode(T* data, size_t length);
private:
void flushOverflow(unsigned char* charData, size_t charLength, size_t& pos);
unsigned char getNext();
void decodeBlock(unsigned char* data);
private:
static const char dec64[82];
private:
std::istream& istr;
size_t charFullLength;
size_t numRead;
int posOverflow;
unsigned char overflow[3];
};
} // namespace olb
#endif
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