Function EncodeBase64

src/OtherFunctions.cpp:446–538

wxString EncodeBase64(const char *pbBufferIn, unsigned int bufLen)
{
	wxString pbBufferOut;
	wxString strHeader;

	if( !strHeaderLine.IsEmpty() ) {
		strHeader = "-----BEGIN " + strHeaderLine + "-----";
		if( g_fUseCRLF ) {
			strHeader += "\r";
		}
		strHeader += "\n";
	}

	unsigned long nDiv = ((unsigned long)bufLen) / 3;
	unsigned long nRem = ((unsigned long)bufLen) % 3;
	unsigned int NewLineSize = g_fUseCRLF ? 2 : 1;

	// Allocate enough space in the output buffer to speed up things
	pbBufferOut.Alloc(
		strHeader.Len() * 2 +		// header/footer
		(bufLen * 4) / 3 + 1 +		// Number of codes
		nDiv           * NewLineSize +	// Number of new lines
		(nRem ? 1 : 0) * NewLineSize );	// Last line
	pbBufferOut = strHeader;

	unsigned long nChars = 0;
	const unsigned char *pIn = (unsigned char*)pbBufferIn;
	while( nDiv > 0 ) {
		pbBufferOut += to_b64[ (pIn[0] >> 2) & 0x3f];
		pbBufferOut += to_b64[((pIn[0] << 4) & 0x30) | ((pIn[1] >> 4) & 0xf)];
		pbBufferOut += to_b64[((pIn[1] << 2) & 0x3c) | ((pIn[2] >> 6) & 0x3)];
		pbBufferOut += to_b64[  pIn[2] & 0x3f];
		pIn += 3;
		nDiv--;
		nChars += 4;
		if( nChars >= g_nCharsPerLine && g_nCharsPerLine != 0 ) {
			nChars = 0;
			if( g_fUseCRLF ) {
				pbBufferOut += "\r";
			}
			pbBufferOut += "\n";
		}
	}
	switch( nRem ) {
	case 2:
		pbBufferOut += to_b64[ (pIn[0] >> 2) & 0x3f];
		pbBufferOut += to_b64[((pIn[0] << 4) & 0x30) | ((pIn[1] >> 4) & 0xf)];
		pbBufferOut += to_b64[ (pIn[1] << 2) & 0x3c];
		pbBufferOut += "=";
		nChars += 4;
		if( nChars >= g_nCharsPerLine && g_nCharsPerLine != 0 ) {
			nChars = 0;
			if( g_fUseCRLF ) {
				pbBufferOut += "\r";
			}
			pbBufferOut += "\n";
		}
		break;