Independent reading and writing

- Separate pointers for reading and writing
- Overwrite read() and write() routines

include/buffer_obs_file.hpp

@@ -37,6 +37,9 @@ std::string format;
 std::string filename="";
 // File stream
 std::fstream file;
+// Read and writing position
+std::streampos readpos;
+std::streampos writepos;
 
 
 //
@@ -60,7 +63,10 @@ public: virtual int put(data_obs* data)=0;
 public: virtual int pop(data_obs* data)=0;
 /** Get last element and delete */
 public: virtual data_obs pop()=0;
-
+/** Read from file **/
+public: std::istream& read(char* s, std::streamsize n);
+/** Write to file **/
+public: std::ostream& write(const char* s, std::streamsize n);
 //
 // Private Methods
 //

src/buffer_obs_file.cpp

@@ -70,6 +70,33 @@ int buffer_obs_file::init() {
 
 }
 
+/********************************************************************************
+ *									 	*
+ * Read data from the buffer.					*
+ *										*
+ ********************************************************************************/
+std::istream& buffer_obs_file::read(char* s, std::streamsize n) {
+
+	file.seekg(readpos,file.beg);
+	readpos=file.tellg()+n;
+
+	return(file.read(s,n));
+
+}
+
+/********************************************************************************
+ *									 	*
+ * Write data to the buffer.					*
+ *										*
+ ********************************************************************************/
+std::ostream& buffer_obs_file::write(const char* s, std::streamsize n) {
+
+	file.seekg(writepos,file.beg);
+	writepos=file.tellg()+n;
+
+	return(file.write(s,n));
+
+}
 /********************************************************************************
  *										*
  * Create directories and open file		 	*
@@ -95,13 +122,19 @@ int buffer_obs_file::open(std::string filename) {
     }
     
     // Open new file
-    file.open(filename_full,std::ios::out | std::ios::app);
+    std::cerr << "OPEN FILE: " << filename_full << std::endl;
+    file.open(filename_full,std::ios::in | std::ios::out |
+    		                std::ios::app | std::ios::ate );
     if (!file.is_open()){
     	std::cerr << "Opening file failed: "
     			  << filename_full
 				  << std::endl;
     }
     
+    // Set reading and writing pos;
+    writepos=file.tellp();
+    readpos=0;
+
     // Set filename
     this->filename = filename;