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int x2i(char *s)
{
 int x = 0;
 for(;;) {
   char c = *s;
   if (c >= '0' && c <= '9') {
      x *= 16;
      x += c - '0';
   }
   else if (c >= 'A' && c <= 'F') {
      x *= 16;
      x += (c - 'A') + 10;
   }
   else if (c >= 'a' && c <= 'f') {
      x *= 16;
      x += (c - 'a') + 10;
    }
   else break;
   s++;
 }
 return x;
}

void explode(String s, String delimiter, String arr[], int ARR_LEN) {
  // by timemage on #arduino/freenode
  unsigned part_begin = 0;
  for (size_t i = 0; i < ARR_LEN; ++i) {
    const auto delim_index = s.indexOf(delimiter, part_begin);
    const auto part_end    = (delim_index >= 0) ? delim_index : s.length();

    arr[i] = s.substring(part_begin, part_end);

    if (delim_index >= 0) {
      part_begin = delim_index + delimiter.length();
    }
  }
}


int pin2gpio(String in) {
  in.toUpperCase();
  if (in == "A0") return int(A0);
  if (in == "D0") return int(D0);
  if (in == "D1") return int(D1);
  if (in == "D2") return int(D2);
  if (in == "D3") return int(D3);
  if (in == "D4") return int(D4);
  if (in == "D5") return int(D5);
  if (in == "D6") return int(D6);
  if (in == "D7") return int(D7);
  if (in == "D8") return int(D8);
  return in.toInt();// fallback to gpio
}

String getContentType(String filename) { // convert the file extension to the MIME type
  if (filename.endsWith(".html")) return "text/html";
  else if (filename.endsWith(".css")) return "text/css";
  else if (filename.endsWith(".js")) return "application/javascript";
  else if (filename.endsWith(".ico")) return "image/x-icon";
  else if (filename.endsWith(".jpg")) return "image/jpeg";
  else if (filename.endsWith(".jpeg")) return "image/jpeg";
  else if (filename.endsWith(".txt")) return "text/plain";
  else if (filename.endsWith(".pdf")) return "application/pdf";
  else if (filename.endsWith(".png")) return "image/png";
  else if (filename.endsWith(".zip")) return "application/zip";
  else if (filename.endsWith(".ttf")) return "font/ttf";
  else if (filename.endsWith(".gif")) return "image/gif";
  else if (filename.endsWith(".mp3")) return "application/ogg";
  else if (filename.endsWith(".ogg")) return "application/ogg";
  else if (filename.endsWith(".mp4")) return "application/ogg";
  else if (filename.endsWith(".gz")) return "application/x-gzip";
  else if (filename.endsWith(".xml")) return "text/xml";
  else if (filename.endsWith(".svg")) return "text/svg+xml";
  return "application/octet-stream";
}

bool writefile(String filepath, String contents) {
  File file = SPIFFS.open(filepath, "w");
  if (!file) {
    return false;
  }
  int bytesWritten = file.print(String(contents));
  if (bytesWritten == 0) {
    return false;
  }
  file.close();
  return true;
}
String readfile(String filepath) {
  File file = SPIFFS.open(filepath, "r");
  if (!file) {
    return "";
  }
  String filecontents;
  while (file.available()) {
    filecontents += char(file.read());
  }
  file.close();
  return filecontents;
}

String fihr(int code, String text) { // format inline html response
  return "<body style=background:#000;color:#FFF;font-family:monospace><h1>"+String(code)+": "+text+" <a href=/>na koren spleti&scaron;&ccaron;a (/)<a/>"
  +"<button onclick=window.history.back();>nazaj</button></h1><hr><h2><i>"+program_ime+"/"+String(verzija[0])+"."+String(verzija[1])+"."+String(verzija[2])
  +"</i></h2></body>";
}


const int NTP_PACKET_SIZE = 48; // NTP time is in the first 48 bytes of message
byte packetBuffer[NTP_PACKET_SIZE]; //buffer to hold incoming & outgoing packets

time_t getNtpTime()
{
  IPAddress ntpServerIP; // NTP server's ip address

  while (Udp.parsePacket() > 0) ; // discard any previously received packets
  Serial.println("Transmit NTP Request");
  // get a random server from the pool
  WiFi.hostByName(ntpServerName, ntpServerIP);
  Serial.print(ntpServerName);
  Serial.print(": ");
  Serial.println(ntpServerIP);
  sendNTPpacket(ntpServerIP);
  uint32_t beginWait = millis();
  while (millis() - beginWait < 1500) {
    int size = Udp.parsePacket();
    if (size >= NTP_PACKET_SIZE) {
      Serial.println("Receive NTP Response");
      Udp.read(packetBuffer, NTP_PACKET_SIZE);  // read packet into the buffer
      unsigned long secsSince1900;
      // convert four bytes starting at location 40 to a long integer
      secsSince1900 =  (unsigned long)packetBuffer[40] << 24;
      secsSince1900 |= (unsigned long)packetBuffer[41] << 16;
      secsSince1900 |= (unsigned long)packetBuffer[42] << 8;
      secsSince1900 |= (unsigned long)packetBuffer[43];
      return secsSince1900 - 2208988800UL + timeZone * SECS_PER_HOUR;
    }
  }
  Serial.println("No NTP Response :-(");
  return 0; // return 0 if unable to get the time
}

// send an NTP request to the time server at the given address
void sendNTPpacket(IPAddress &address)
{
  // set all bytes in the buffer to 0
  memset(packetBuffer, 0, NTP_PACKET_SIZE);
  // Initialize values needed to form NTP request
  // (see URL above for details on the packets)
  packetBuffer[0] = 0b11100011;   // LI, Version, Mode
  packetBuffer[1] = 0;     // Stratum, or type of clock
  packetBuffer[2] = 6;     // Polling Interval
  packetBuffer[3] = 0xEC;  // Peer Clock Precision
  // 8 bytes of zero for Root Delay & Root Dispersion
  packetBuffer[12] = 49;
  packetBuffer[13] = 0x4E;
  packetBuffer[14] = 49;
  packetBuffer[15] = 52;
  // all NTP fields have been given values, now
  // you can send a packet requesting a timestamp:
  Udp.beginPacket(address, 123); //NTP requests are to port 123
  Udp.write(packetBuffer, NTP_PACKET_SIZE);
  Udp.endPacket();
}