A fast C++ Hexconverter-Class using a Lookuptable (for ANSI and lowercase only)

HexConverter.cpp

class HexConv {
public:
	HexConv() {
		// Setup HexTable
		for (char i = 0; i < 10; i++)
			m_HexTable[i] = i + '0';

		for (char j = 0; j < 6; j++) {
			m_HexTable[j + 10] = j + 'a';
			m_HexTable[j + ('a' - '0')] = j + ('0' + 10);
		}
	}

	void BinToHex(    //
		void*  pData, // Data to be converted
		size_t nData, // Size of Data
		char*  sz     // Target String to Fill
	) const {
		for (unsigned int i = 0; i < nData; i++) {
			sz[i * 2] = m_HexTable[((unsigned char*)pData)[i] >> 4];
			sz[(i * 2) + 1] = m_HexTable[((unsigned char*)pData)[i] & 0xf];
		}
		sz[nData * 2] = '\0';
	}
	void HexToBin( //
		char* sz,  // String to be converted
		void* pOut // Target array to fill
	) const {
		while (*sz != '\0'
			*(*(unsigned char**)&pOut)++ = ((m_HexTable[*sz++ - '0'] - '0') << 4) + (m_HexTable[*sz++ - '0'] - '0');
	}

private:
	char m_HexTable[('a' - '0') - 1];
};