Thread: Base64 encoder

Hello.


Someone know if exist any API or any way to encode a ANSI string to Base64?


Thanks

Code:

CString Base64Encode(LPCTSTR src)
{
	if( !src )
		return( _T("") );

	int size = static_cast<int> (strlen( src ));
	CString out;
	LPSTR p = out.GetBuffer( size*4/3+5);

	for(int i=0; i<size; i+=3)
	{
		unsigned char b1=0, b2=0, b3=0, b4=0, b5=0, b6=0, b7=0;

		b1 = src[i];

		if(i+1<size)
			b2 = src[i+1];

		if(i+2<size)
			b3 = src[i+2];

		b4= b1>>2;
		b5= ((b1&0x3)<<4)|(b2>>4);
		b6= ((b2&0xf)<<2)|(b3>>6);
		b7= b3&0x3f;

		*p++= encode(b4);
		*p++= encode(b5);

		if(i+1<size) {
			*p++= encode(b6);
		} else {
			*p++= '=';
		}

		if(i+2<size) {
			*p++= encode(b7);
		} else {
			*p++= '=';
		}

	}
	*p = '\0';
	out.ReleaseBuffer();
	return( out );
}


// Base64 encode one byte
char CBasicAuth::encode(unsigned char u)
{
	if(u < 26)  return 'A' + u;
	if(u < 52)  return 'a' + (u - 26);
	if(u < 62)  return '0' + (u - 52);
	if(u == 62) return '+';

	return '/';
}

Not to also mention it appears to be MFC/Windows-specific C++.

I wrote one some time ago.
http://www.acc.umu.se/~onionkgt/stuff/base64.tar.gz