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);


Download demo project - 5 Kb


  • whar_t support broken ?

    Posted by Legacy on 11/13/2003 12:00am

    Originally posted by: Vimal Earnest

    This is what I understood
    base64<char> encoder; //encode/decode 'char' type
    base64<wchar_t> encoder; //encode/decode 'wchar_t' type

    But the code given below doesn't work as expected

    int _State = 0;
    base64<wchar_t> encoder;
    wchar_t buff_in[6] = L"Hello";
    wchar_t buff_out[12] = {0};
    encoder.put(buff_in, buff_in+6, buff_out, _State, base64<>::crlf());
    int len = wcslen(buff_out);
    encoder.get(buff_out, buff_out+len, buff_in, _State);
    assert(wcscmp(buff_in, L"Hello") != 0);

    Is this a bug ?


  • Good class, but...

    Posted by Legacy on 08/28/2002 12:00am

    Originally posted by: Lionel Zhang

    in get(), shouldn't _To be incremented?

    i.e., should it look like

    // write to output 3 bytes
    *_To++ = (byte_t) _3to4.get_0();
    *_To++ = (byte_t) _3to4.get_1();
    *_To++ = (byte_t) _3to4.get_2();

    instead of

    *_To = (byte_t) _3to4.get_0();
    *_To = (byte_t) _3to4.get_1();
    *_To = (byte_t) _3to4.get_2();

    there are also a few other lines in get() that need ++

  • STL decode/Encode

    Posted by Legacy on 04/03/2002 12:00am

    Originally posted by: jyothi

    How to use ur code.I wanted to have c++ classes for encode and decode the base64 and quoted printable.
    Please help me out.

  • Base64 codec

    Posted by Legacy on 03/06/2002 12:00am

    Originally posted by: Fanzhe Cui

    This is great code. It does not depend on any platform.

  • STL Compatible Base64 Encoder - Excellent.

    Posted by Legacy on 01/26/2002 12:00am

    Originally posted by: James Pannozzi

    Excellent utilization of STL.

    Would it be easy to modify it to decode MHTML (.mht) into text and jpg images?

    Thanks again for interesting code.

    Ochen Xoposho!


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