STL Compatible Base64 Encoder

Environment: Any C++ compiler with STL support

This is compatible with STL base64 encoder.

It can encode/decode data from/to i(o)streams, streambufs, memory buffers, etc. Encoder uses iterator concept. Iterator must overload the *, ==, !=, and prefics ++ operators.

See encoder using:

1) Declare encoder

#include <base64.hpp>
int _State = 0;
base64<char> encoder; // base64 output/input in chars
                      // (may be wchar_t, …) or base64<> encoder;

2) Encode data form cin stream to output file

#include <iostream>
#include <fstream>

//
   …
//
// encode from cin

istream& istr = cin;
istreambuf_iterator<char> _From(istr.rdbuf());
istreambuf_iterator<char> _To(0);

//_From, _Last, _To may be any iterator class or pointers
// encode to output file
ofstream ostr(“test_out.txt”);
ostreambuf_iterator<char> _Out(ostr);

// Encode data with CRLF ta the end of line.
// You can use base64<>::noline() or base64<>::crlfsp()
// or other classes.
encoder.put(_From, _To, _Out, _State, base64<>::crlf());

3) Decode data form file stream to console output stream

// decode from file …
ifstream istr(“test_out.txt”);
istreambuf_iterator<char> _From(istr.rdbuf());
istreambuf_iterator<char> _To(0);

// … to console
ostreambuf_iterator<char> _Out(cout);
encoder.get(_From, _To, _Out, _State);

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