Function appendHex

ThirdParty/jsoncpp/vtkjsoncpp/jsoncpp.cpp:4360–4362

}

static void appendHex(String& result, unsigned ch) {
  result.append("\\u").append(toHex16Bit(ch));
}

static String valueToQuotedStringN(const char* value, size_t length,
                                   bool emitUTF8 = false) {