C++ Print a char* out as a hex dump

HexArrayToStr.cpp

static void HexArrayToStr(const char* data, size_t length, std::string& output) {
  const char* NIBBLE_TO_HEX = {"0123456789ABCDEF"};
  output.assign(length * 2 + 1, 0);
  char* buffer = output.data();
  for (size_t i = 0; i < length; i++) {
    int nibble = uint8_t(data[i]) >> 4;
    buffer[2 * i] = NIBBLE_TO_HEX[nibble];
    nibble = uint8_t(data[i]) & 0x0F;
    buffer[2 * i + 1] = NIBBLE_TO_HEX[nibble];
  }
}