this cleaned up functions and global constants and hid them away in to their header and source files

tarfunc.h

@@ -0,0 +1,26 @@
+/* this header file contains function declarations used parsing a tar file
+ *
+ * by Marcel Nowicki (github@epenis.de | github.com/blindi0815)
+ */
+
+#include <fstream>
+
+
+#ifndef TARSTATS___TARFUNC_H
+#define TARSTATS___TARFUNC_H
+namespace tar {
+// checks if a valid modern tar file - ustar
+    bool validTar(std::istream &file);
+
+// checks if a 512byte block consist only of 0 or \0
+    bool eof(const char *buf);
+
+// gets size of an item in bytes. assumes octal encoding.
+    uint64_t getitemsize(const char *buf);
+
+// gets type of an item
+    std::string getitemtype(char &n);
+}
+
+
+#endif //TARSTATS___TARFUNC_H