// Base64.h
//*********************************************************************
//* C_Base64 - a simple base64 encoder and decoder.
//*
//* Copyright (c) 1999, Bob Withers - bwit@pobox.com
//*
//* This code may be freely used for any purpose, either personal
//* or commercial, provided the authors copyright notice remains
//* intact.
//*********************************************************************
#ifndef __BASE64_H__
#define __BASE64_H__
#include <string>
const char fillchar = '=';
// 00000000001111111111222222
// 01234567890123456789012345
static std::string cvt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
// 22223333333333444444444455
// 67890123456789012345678901
"abcdefghijklmnopqrstuvwxyz"
// 555555556666
// 234567890123
"0123456789+/";
class Base64
{
public:
static std::string encode(std::string data);
static std::string decode(std::string data);
};
#endif
// Base64.cpp
//*********************************************************************
//* Base64 - a simple base64 encoder and decoder.
//*
//* Copyright (c) 1999, Bob Withers - bwit@pobox.com
//*
//* This code may be freely used for any purpose, either personal
//* or commercial, provided the authors copyright notice remains
//* intact.
//*********************************************************************
#include "base64.h"
using namespace std;
string Base64::encode(string data)
{
auto string::size_type i;
auto char c;
auto string::size_type len = data.length();
auto string ret;
for (i = 0; i < len; ++i)
{
c = (data[i] >> 2) & 0x3f;
ret.append(1, cvt[c]);
c = (data[i] << 4) & 0x3f;
if (++i < len)
c |= (data[i] >> 4) & 0x0f;
ret.append(1, cvt[c]);
if (i < len)
{
c = (data[i] << 2) & 0x3f;
if (++i < len)
c |= (data[i] >> 6) & 0x03;
ret.append(1, cvt[c]);
}
else
{
++i;
ret.append(1, fillchar);
}
if (i < len)
{
c = data[i] & 0x3f;
ret.append(1, cvt[c]);
}
else
{
ret.append(1, fillchar);
}
}
return(ret);
}
string Base64::decode(string data)
{
auto string::size_type i;
auto char c;
auto char c1;
auto string::size_type len = data.length();
auto string ret;
for (i = 0; i < len; ++i)
{
c = (char) cvt.find(data[i]);
++i;
c1 = (char) cvt.find(data[i]);
c = (c << 2) | ((c1 >> 4) & 0x3);
ret.append(1, c);
if (++i < len)
{
c = data[i];
if (fillchar == c)
break;
c = (char) cvt.find(c);
c1 = ((c1 << 4) & 0xf0) | ((c >> 2) & 0xf);
ret.append(1, c1);
}
if (++i < len)
{
c1 = data[i];
if (fillchar == c1)
break;
c1 = (char) cvt.find(c1);
c = ((c << 6) & 0xc0) | c1;
ret.append(1, c);
}
}
return(ret);
}