gbase64.h

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//
// Copyright (C) 2001-2013 Graeme Walker <graeme_walker@users.sourceforge.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 3 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, see <http://www.gnu.org/licenses/>.
// ===

#ifndef G_BASE64_H
#define G_BASE64_H

#include "gdef.h"
#include "gexception.h"
#include <string>

namespace G
{
        class Base64 ;
}

class G::Base64 
{
public:
        G_EXCEPTION( Error , "base64 encoding error" ) ;

        static std::string encode( const std::string & s , const std::string & line_break ) ;

        static std::string encode( const std::string & s ) ;

        static std::string decode( const std::string & ) ;

        static bool valid( const std::string & ) ;

private:
        Base64() ;
        static inline g_uint32_t numeric( char c ) ;
        static inline void accumulate_8( g_uint32_t & n , std::string::const_iterator & , 
                std::string::const_iterator , int & ) ;
        static inline size_t hi_6( g_uint32_t n ) ;
        static inline void generate_6( g_uint32_t & n , int & i , std::string & result ) ;
        static inline char to_char( g_uint32_t n ) ;
        static inline size_t index( char c , bool & error ) ;
        static inline size_t accumulate_6( g_uint32_t & n , char c_in , int & , bool & error ) ;
        static inline g_uint32_t hi_8( g_uint32_t n ) ;
        static inline void generate_8( g_uint32_t & n , int & i , std::string & result ) ;
        static std::string decode( const std::string & s , bool & error ) ;
} ;

#endif