decode.h

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// :mode=c++:
/*
decode.h - c++ wrapper for a base64 decoding algorithm

This is part of the libb64 project, and has been placed in the public domain.
For details, see http://sourceforge.net/projects/libb64
*/
#ifndef BASE64_DECODE_H
#define BASE64_DECODE_H

#include <iostream>

namespace base64
{
        extern "C"
        {
                #include "cdecode.h"
        }

        struct decoder
        {
                base64_decodestate _state;
                int _buffersize;

                decoder(int buffersize_in = 512)
                : _buffersize(buffersize_in)
                {
                        base64_init_decodestate(&_state);
                }

                int decode(char value_in)
                {
                        return base64_decode_value(value_in);
                }

                int decode(const char* code_in, const int length_in, char* plaintext_out)
                {
                        return base64_decode_block(code_in, length_in, plaintext_out, &_state);
                }

                void decode(std::istream& istream_in, std::ostream& ostream_in)
                {
                        base64_init_decodestate(&_state);
                        //
                        const int N = _buffersize;
                        char* code = new char[N];
                        char* plaintext = new char[N];
                        int codelength;
                        int plainlength;

                        do
                        {
                                istream_in.read((char*)code, N);
                                codelength = istream_in.gcount();
                                plainlength = decode(code, codelength, plaintext);
                                ostream_in.write((const char*)plaintext, plainlength);
                        }
                        while (istream_in.good() && codelength > 0);
                        //
                        base64_init_decodestate(&_state);

                        delete [] code;
                        delete [] plaintext;
                }
        };

} // namespace base64



#endif // BASE64_DECODE_H