//https://en.wikipedia.org/wiki/Base64
std::string base64Encode(const std::vector<char>& byteData);
std::vector<char> base64Decode(std::string & const inputString);
std::string Cbase64Dlg::base64Encode(const std::vector<char>& byteData)
{
const std::string codes = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
std::string base64String;
int b;
for (size_t i = 0; i < byteData.size(); i = i+3)
{
b = (byteData[i] & 0xFC) >> 2;
base64String.push_back(codes[b]);
b = (byteData[i] & 0x03) << 4;
if (i + 1 < byteData.size())
{
b |= (byteData[i + 1] & 0xF0) >> 4;
base64String.push_back(codes[b]);
b = (byteData[i + 1] & 0x0F) << 2;
if (i+2 < byteData.size())
{
b |= (byteData[i + 2] & 0xC0) >> 6;
base64String.push_back(codes[b]);
b = byteData[i + 2] & 0x3F;
base64String.push_back(codes[b]);
}
else
{
base64String.push_back(codes[b]);
base64String.append("=");
}
}
else
{
base64String.push_back(codes[b]);
base64String.append("==");
}
}
return base64String;
}
std::vector<char> Cbase64Dlg::base64Decode(std::string & const inputString)
{
static std::string codes = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
std::vector<char> decoded;
if (inputString.length() % 4 != 0)
{
return std::vector<char>();
}
//The ratio of output bytes to input bytes is 4:3
int outLen = (inputString.length() * 3 / 4);
size_t pos = inputString.find_first_of('=');
if (pos != std::string::npos)
{
decoded.resize(outLen - (inputString.length() - pos));
}
else
{
decoded.resize(outLen);
}
int j = 0;
int b[4] = {};
const char* p = inputString.c_str();
while(p && *p && j < outLen)
{
bool valid = false;
for (int i=0; p && i < 4; ++i)
{
size_t pos = codes.find_first_of(*p++);
if ( pos != std::string::npos)
{
b[i] = pos;
}
}
if (j < outLen)
{
decoded[j++] = (byte) ((b[0] << 2) | (b[1] >> 4));;
if (j < outLen && b[2] < 64)
{
decoded[j++] = (byte) ((b[1] << 4) | (b[2] >> 2));
if (j < outLen && b[3] < 64)
{
decoded[j++] = (byte) ((b[2] << 6) | b[3]);
}
}
}
}
return decoded;
}
void Cbase64Dlg::OnBnClickedButton1()
{
char myints[] = "ABC&&&&&&&&&&";
std::vector<char> byte (myints, myints + sizeof(myints) / sizeof(char) );
std::string value = base64Encode(byte);
std::cout << value << std::endl;
std::vector<char>decode = base64Decode(value);
}
base64 encoding
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