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+/*
+ * FTP SERVER FOR ESP8266/ESP32
+ * based on FTP Serveur for Arduino Due and Ethernet shield (W5100) or WIZ820io (W5200)
+ * based on Jean-Michel Gallego's work
+ * modified to work with esp8266 SPIFFS by David Paiva (david@nailbuster.com)
+ * modified to work with esp8266 LitteFS by Daniel Plasa dplasa@gmail.com
+ * Also done some code reworks and all string contants are now in flash memory 
+ * by using F(), PSTR() ... on the string literals.  
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef FTP_SERVER_H
+#define FTP_SERVER_H
+
+/*******************************************************************************
+ **                                                                            **
+ **                       DEFINITIONS FOR FTP SERVER/CLIENT                    **
+ **                                                                            **
+ *******************************************************************************/
+#include "FTPCommon.h"
+#define FTP_SERVER_VERSION "0.9.3-20200526"
+
+class FTPServer : public FTPCommon
+{
+public:
+  // contruct an instance of the FTP server using a
+  // given FS object, e.g. SPIFFS or LittleFS
+  FTPServer(FS &_FSImplementation);
+
+  // starts the FTP server with username and password,
+  // either one can be empty to enable anonymous ftp
+  void begin(const String &uname, const String &pword);
+
+  // stops the FTP server
+  void stop();
+
+  // set the FTP server's timeout in seconds
+  void setTimeout(uint16_t timeout = FTP_TIME_OUT * 60);
+
+  // needs to be called frequently (e.g. in loop() )
+  // to process ftp requests
+  void handleFTP();
+
+private:
+  enum internalState
+  {
+    cInit = 0,
+    cWait,
+    cCheck,
+    cUserId,
+    cPassword,
+    cLoginOk,
+    cProcess,
+
+    tIdle,
+    tRetrieve,
+    tStore
+  };
+
+  void iniVariables();
+  void disconnectClient(bool gracious = true);
+  int8_t processCommand();
+  virtual void closeTransfer();
+  void abortTransfer();
+
+  virtual int8_t dataConnect();
+
+  String getPathName(const String &param, bool includeLast = false);
+  String getFileName(const String &param, bool fullFilePath = false);
+  String makeDateTimeStr(time_t fileTime);
+  int8_t readChar();
+  void updateTimeout(uint16_t timeout);
+
+  // server specific
+  bool dataPassiveConn = true; // PASV (passive) mode is our default
+  String _FTP_USER;            // usename
+  String _FTP_PASS;            // password
+  uint32_t command;            // numeric command code of command sent by the client
+  String cmdLine;              // command line as read from client
+  String cmdString;            // command as textual representation
+  String parameters;           // parameters sent by client
+  String cwd;                  // the current directory
+  String rnFrom;               // previous command was RNFR, this is the source file name
+
+  internalState cmdState, // state of ftp control connection
+      transferState;      // state of ftp data connection
+
+  uint32_t millisEndConnection;
+};
+
+#endif // FTP_SERVER_H