unsigned int TXFMBase64::readBytes()

in xsec/transformers/TXFMBase64.cpp [100:187]

• 63 lines of code
• 20 McCabe index (conditional complexity)

unsigned int TXFMBase64::readBytes(XMLByte * const toFill, unsigned int maxToFill) {
	
	unsigned int ret, fill, leftToFill;

	ret = 0;					// How much have we copied?
	leftToFill = maxToFill;		// Still have to copy in entire thing

	while (ret != maxToFill && (m_complete == false || m_remaining > 0)) {
	
		if (m_remaining != 0) {

			// Copy anything remaining in the buffer to the output

			fill = (leftToFill > m_remaining ? m_remaining : leftToFill);
			memcpy(&toFill[ret], m_outputBuffer, fill);

			if (fill < m_remaining)
				memmove(m_outputBuffer, m_outputBuffer + fill, (m_remaining - fill));

			m_remaining -= fill;
			leftToFill -= fill;
			ret += fill;
		}

		// Now do some crypting

		if (m_complete == false && m_remaining == 0) {

			unsigned int sz = input->readBytes(m_inputBuffer, 1024);
		
			if (m_doDecode) {
				
				if (sz == 0) {
					m_complete = true;
					m_remaining = mp_b64->decodeFinish(m_outputBuffer, 2048);
				}
				else
					m_remaining = mp_b64->decode(m_inputBuffer, sz, m_outputBuffer, 2048);
			}
			else {

				if (sz == 0) {
					m_complete = true;
					m_remaining = mp_b64->encodeFinish(m_outputBuffer, 3072);
				}
				else
					m_remaining = mp_b64->encode(m_inputBuffer, sz, m_outputBuffer, 2048);
			}
		}

	}

	return ret;
#if 0
	unsigned int ret, fill;

	if (m_complete)
		return 0;

	fill = (maxToFill > 2000 ? 2000 : maxToFill);
	ret = 0;
	while (ret == 0 && !m_complete) {
	
		unsigned int sz = input->readBytes(m_base64Buffer, fill / 2);

		if (m_doDecode) {
			if (sz == 0)
				ret = mp_b64->decodeFinish((unsigned char *) toFill, maxToFill);
			else
				ret = mp_b64->decode(m_base64Buffer, sz, (unsigned char *) toFill, maxToFill);

			if (ret == 0)
				m_complete = true;
		}
		else {
			if (sz == 0) {
				ret = mp_b64->encodeFinish((unsigned char *) toFill, maxToFill);
				m_complete = true;
			}
			else 
				ret = mp_b64->encode(m_base64Buffer, sz, (unsigned char *) toFill, maxToFill);

		}
	}

	return ret;
#endif
}