Index: fact/tools/pyscripts/sandbox/dneise/fact_compress/c++/readfits.cpp
===================================================================
--- fact/tools/pyscripts/sandbox/dneise/fact_compress/c++/readfits.cpp	(revision 14253)
+++ fact/tools/pyscripts/sandbox/dneise/fact_compress/c++/readfits.cpp	(revision 14259)
@@ -4,4 +4,9 @@
 #include <fstream>
 #include <vector>
+
+// I will use the fits class by TB for reading the interesting data from the files
+#define HAVE_ZLIB
+#include "fits"
+
 using namespace std;
 
@@ -9,10 +14,83 @@
 char * memblock;
 
-int main () {
-    
-    ifstream file ("a.fits", ios::in|ios::binary);
-    ofstream out ("bla.bin", ios::out|ios::binary|ios::trunc);
-    
-    if (file.is_open() && out.is_open())
+int main (int argc, char * argv[]) {
+    
+    if (argc < 3)
+    {
+        cout << "Usage: " << argv[0] << " data-file-name calib-file-name [ouput-file-name]" << endl;
+        cout << "" << endl;
+    }
+    
+    char * data_file_name = argv[1];
+    char * calib_file_name = argv[2];
+    char * out_file_name = 0;
+    if (argc == 4)
+    {
+        out_file_name = argv[3];
+    }
+    else
+    {
+        out_file_name = new char[strlen(data_file_name)+4];
+        strcpy(out_file_name, data_file_name);
+        strcpy(out_file_name+strlen(data_file_name),".fc");
+        out_file_name[strlen(data_file_name)+3] = 0;
+    }
+    
+    
+    
+    
+    //=========================================================================
+    // CALIBRATION CONSTANTS
+    //=========================================================================
+    fits * calib =new fits(calib_file_name);
+    calib->PrintKeys();
+    calib->PrintColums();
+    offset_mV = new float[]
+    
+    // I need the offset calibration constants from the calibration files
+    // they are stored as floats at a known position inside the calibration file...
+    long position_of_calibration_constants = 0x1000;
+    // The calibration constants are stored in units of pseudo-mV. 
+    // but I need them in ADC units
+    // I will first read offset_mV from the file, then multiply (or divide) 
+    // with the conversion factor 2000/4096.;
+    // then I will convert it to shorts.
+    // From that point on I will only use the shorts in *offset*, so I can
+    // free the memory for *offset_mV* already.
+    int size_of_offset = 1440*1024;
+    int size_of_offset_memblock = 1440*1024*sizeof(float);
+    float * offset_mV = new float[size_of_offset];
+    short * offset = new short[size_of_offset];
+    char * memblock = new char[size_of_offset_memblock];
+    
+    ifstream calib (calib_file_name, ios::in|ios::binary);
+    if ( !calib.is_open() )
+    {
+        cerr << "Could not open Calibration File:" << calib_file_name << ".. ABORT." << endl;
+        return 1;
+    }
+    else // file was opened, I can go on...
+    {
+        calib.seekg(position_of_calibration_constants, ios::beg);
+        calib.read(memblock, size_of_offset_memblock);
+        offset_mV = (float*)memblock;
+        for (int i=0; i<size_of_offset; i++)
+        {
+            // -0.5 is for rounding correctly negative integers.
+            // in all cases where it worked, the offset should be negative for FACT.
+            offset[i] = short(offset_mV / 2000. * 4096 - 0.5);
+        }
+    }
+    delete[] offset_mV;
+    delete[] memblock;
+    calib.close();
+    //=========================================================================
+    // END OF                CALIBRATION CONSTANTS
+    //=========================================================================
+    
+    
+    ifstream data (data_file_name, ios::in|ios::binary);
+    ofstream out (out_file_name, ios::out|ios::binary|ios::trunc);
+    if (data.is_open() && out.is_open())
     {
         // create our own header
@@ -23,15 +101,15 @@
         const int ascii_header_size = 0x2d00;
         char * memblock = new char [ascii_header_size];
-        file.read(memblock, ascii_header_size);
+        data.read(memblock, ascii_header_size);
         out.write(memblock, ascii_header_size);
         delete[] memblock;
         
         for ( int event_id = 0 ; event_id < 1000; event_id++)
-        //while ( file.good() )
+        //while ( data.good() )
         {
             // copy binary header to new file
             const int bin_header_size = 3390;
             char * memblock = new char [bin_header_size];
-            file.read(memblock, bin_header_size);
+            data.read(memblock, bin_header_size);
             out.write(memblock, bin_header_size);
             delete[] memblock;
@@ -47,5 +125,5 @@
                 unsigned char * sizes = new unsigned char [diff_size];
                 
-                file.read(memblock, data_size*sizeof(short) );
+                data.read(memblock, data_size*sizeof(short) );
                 
                 for ( int i = 0; i<diff_size; i++)
@@ -117,7 +195,6 @@
                         for (int j = 0; j<group_sizes[i]; j++)
                         {
-                            out.write( (char*)&(diffs[diff_index++]), 1);
+                            out.write( (short*)&(diffs[diff_index++]), 2);
                         }
-                        
                     }
                 }
@@ -131,8 +208,8 @@
         }
         cout << "finished with 1000 events." << endl;
-        long after_address = file.tellg();
-        file.seekg (0, ios::end);
-        long end = file.tellg();
-        file.seekg (after_address, ios::beg);
+        long after_address = data.tellg();
+        data.seekg (0, ios::end);
+        long end = data.tellg();
+        data.seekg (after_address, ios::beg);
         
         cout << "between last event and end:" << end - after_address << endl;
@@ -140,5 +217,5 @@
         const int rest_size = end-after_address;
         char * memblock2 = new char [rest_size];
-        file.read(memblock2, rest_size);
+        data.read(memblock2, rest_size);
         cout << "first char in memblock: " << int(memblock2[0]) << endl;
         char lastchar = memblock2[0];
@@ -156,5 +233,5 @@
         
         
-        file.close();
+        data.close();
         out.close();
   } //end of if file open