add configBitstreamParser an base class for all bitstream file parser

configBitstreamParser.cpp

@@ -0,0 +1,28 @@
+#include <iostream>
+#include <stdint.h>
+#include <strings.h>
+
+#include "configBitstreamParser.hpp"
+
+using namespace std;
+
+ConfigBitstreamParser::ConfigBitstreamParser(string filename, int mode):
+			_filename(filename), _bit_length(0),
+			_file_size(0), _fd(filename,
+			ifstream::in | (ios_base::openmode)mode), _bit_data()
+{
+	if (!_fd.is_open()) {
+		cerr << "Error: fail to open " << _filename << endl;
+		throw std::exception();
+	}
+	_fd.seekg(0, _fd.end);
+	_file_size = _fd.tellg();
+	_fd.seekg(0, _fd.beg);
+
+	_bit_data.reserve(_file_size);
+}
+
+ConfigBitstreamParser::~ConfigBitstreamParser()
+{
+	_fd.close();
+}