Many additions and changes.

File.cpp

@@ -0,0 +1,43 @@
+#include "File.h"
+#include "Exception.h"
+
+namespace coreutils {
+   
+   File::File(std::string fileName, int mode, int authority) {
+      
+      this->fileName = fileName;
+      
+      struct stat status;
+      stat(fileName.c_str(), &status);
+      
+      buffer = NULL;
+      
+      setBufferSize(status.st_size);
+      
+      fd = open(fileName.c_str(), mode, authority);   
+      if(fd < 0) {
+         std::stringstream temp;
+         temp << "Error opening file " << fileName << ".";
+         throw Exception(temp.str(), __FILE__, __LINE__);
+      }
+   }
+   
+   File::~File() {
+      
+   }
+   
+   void File::setBufferSize(size_t size) {
+      buffer = (char *)realloc(buffer, size);
+      this->size = size;
+   }
+   
+   void File::read() {
+      size = ::read(fd, buffer, size);
+      setBufferSize(size);   
+   }
+   
+   void File::write(std::string data) {
+      ::write(fd, data.c_str(), data.length());
+   }
+   
+}