diff --git a/sls_detector_calibration/jungfrauFileSLSReceiver.C b/sls_detector_calibration/jungfrauFileSLSReceiver.C
new file mode 100644
index 0000000..1647ce3
--- /dev/null
+++ b/sls_detector_calibration/jungfrauFileSLSReceiver.C
@@ -0,0 +1,162 @@
+//#include "jungfrauCommonHeader.h"
+
+#include <fstream>  // std::ifstream
+#include <stdint.h>  // uint16_t
+#include <ctime>  // clock
+#include <iomanip> // std::setprecision
+
+#include <time.h>
+#include <sys/time.h>
+
+class oneframe {
+
+public:
+    uint64_t frameNumber;
+    uint32_t expLength;
+    uint32_t packetNumber;
+    uint64_t bunchid;
+    uint64_t timestamp;
+    uint16_t modId;
+    uint16_t row;
+    uint16_t column;
+    uint16_t detSpec2;
+    uint32_t debug;
+    uint16_t roundRNumber;
+    uint8_t detType;
+    uint8_t version;
+    uint16_t detSpecx[32];
+    uint16_t imagedata[NCH];
+
+};
+
+class jungfrauFileSLS {
+
+ private:
+
+ public:
+  ifstream filebin; // file descriptor
+  oneframe thisframe;
+  long long int filebinSize; // need 64 bit
+  clock_t filebinStart;
+  clock_t filebinStop;
+  struct  timeval tss,tsss; //for timing
+
+  jungfrauFileSLS() { // constructor
+
+    cout << "jungfrauFile constructed" << endl;
+    //cout << "sizeof(thisframe) " << sizeof(thisframe) << endl;
+    //cout << "address of data array " <<  &(thisframe.imagedata)<< endl;
+
+  }
+  
+  uint16_t * getFrameDataHandle() {
+
+    return (uint16_t*)&(thisframe.imagedata);
+
+  }
+
+  bool readNextFrame() {
+ 
+    if (filebin.is_open()) {
+      if (!filebin.eof()) {
+	filebin.read(((char*)&thisframe),sizeof(thisframe));
+	
+	std::cout << std::fixed << std::setprecision(2)
+		  << "\r   [" << std::string(int(filebin.tellg()*10 / float(filebinSize)), '#')
+		  << std::string(10 + 1 - int(filebin.tellg()*10 / float(filebinSize)), ' ') 
+		  << "] " << 100 * filebin.tellg() / float(filebinSize) << "%";
+
+        if (filebin.good()) {return true;} // necessary to stop the frame 'after' the last frame returning true
+	else {
+	  filebinStop = clock();
+	  double elapsed_secs = double(filebinStop - filebinStart) / CLOCKS_PER_SEC;
+	  cout << " end of file reached in " << elapsed_secs << "s" << endl;
+	  return false;
+	}
+
+      } else {
+	filebinStop = clock();
+	double elapsed_secs = double(filebinStop - filebinStart) / CLOCKS_PER_SEC;
+	cout << " end of file reached in " << elapsed_secs << "s" << endl;
+	
+	return false;
+      }
+    } else {
+      cout << "file not open" << endl;
+      return false;
+    }
+
+  }
+
+  int currentFrameNumber() {
+ 
+    return int(thisframe.frameNumber);
+
+  }
+
+  uint64_t currentBunchID() {
+ 
+    return uint64_t(thisframe.bunchid);
+
+  }
+
+  /*****************/
+  /* VH 2022-05-05 */
+  /*****************/
+  uint64_t currentSCnumber() {
+
+    return ( ( thisframe.bunchid >> 8 )&0xf );
+
+  }
+  /*****************/
+  /* VH 2022-05-05 */
+  /*****************/
+
+  void rewind() {
+    if (filebin.is_open()) {
+      cout << "rewinding file" << endl;
+      filebin.clear();
+      filebin.seekg(0);
+    } else {
+      cout << "file was not open" << endl;
+    }
+  }
+
+  void open(char *fformat, int fileindex) {
+
+    char fname[1000];
+    sprintf(fname,fformat,fileindex);
+    cout << "file name " << fname << endl;
+    if (filebin.is_open()) {
+      cout << "WARNING: a file is already open" << endl;
+      cout << "WARNING: closing this file" << endl;
+      filebin.close();
+    }
+    cout << "opening file" << endl;
+    filebin.open((const char *)(fname), ios::in | ios::binary);
+    filebin.seekg(0,filebin.end);
+    filebinSize = filebin.tellg();
+    filebin.seekg(0,filebin.beg);
+    filebinStart = clock();
+  }
+
+  void close() {
+
+    if (filebin.is_open()) {
+      filebin.close();
+      cout << "closed file" << endl;
+    } else {
+      cout << "file was not open" << endl;
+    }
+
+  }
+
+  bool isOpen() {
+    if (filebin.is_open()) {
+      return true;
+    } else {
+      return false;
+    }
+  }
+
+};