diff --git a/bitparser.cpp b/bitparser.cpp
index fbd665d..b4f79bd 100644
--- a/bitparser.cpp
+++ b/bitparser.cpp
@@ -14,30 +14,33 @@ using namespace std;
 #endif
 
 BitParser::BitParser(string filename):
+	ConfigBitstreamParser(filename, ConfigBitstreamParser::BIN_MODE),
 	fieldA(), part_name(), date(), hour(),
-	design_name(), userID(), toolVersion(),
-	file_length(0), _filename(filename)
+	design_name(), userID(), toolVersion()
 {
-	bit_data = NULL;
 }
 BitParser::~BitParser() 
 {
-	if (bit_data != NULL)
-		free(bit_data);
 }
 
-int BitParser::parseField(unsigned char type, FILE *fd)
+int BitParser::parseField()
 {
+	int ret = 1;
 	short length;
 	char tmp[64];
 	int pos, prev_pos;
+
+	/* type */
+	uint8_t type;
+	_fd.read((char *)&type, sizeof(uint8_t));
+
 	if (type != 'e') {
-		fread(&length, sizeof(short), 1, fd);
+		_fd.read((char*)&length, sizeof(uint16_t));
 		length = ntohs(length);
 	} else {
 		length = 4;
 	}
-	fread(tmp, sizeof(unsigned char), length, fd);
+	_fd.read(tmp, sizeof(uint8_t)*length);
 #ifdef DEBUG
 	for (int i = 0; i < length; i++)
 		printf("%c", tmp[i]);
@@ -71,61 +74,39 @@ int BitParser::parseField(unsigned char type, FILE *fd)
 			hour = (tmp);
 			break;
 		case 'e': /* file size */
-			file_length = 0;
+			_bit_length = 0;
 			for (int i = 0; i < 4; i++) {
 #ifdef DEBUG
-				printf("%x %x\n", 0xff & tmp[i], file_length);
+				printf("%x %x\n", 0xff & tmp[i], _bit_length);
 #endif
-				file_length <<= 8;
-				file_length |= 0xff & tmp[i];
+				_bit_length <<= 8;
+				_bit_length |= 0xff & tmp[i];
 			}
 #ifdef DEBUG
-			printf("    %x\n", file_length);
+			printf("    %x\n", _bit_length);
 #endif
+			ret = 0;
 
 			break;
 	}
-	return length;
+	return ret;
 
 }
 int BitParser::parse()
 {
-	unsigned char *tmp_data;
-	FILE *fd = fopen(_filename.c_str(), "rb");
-	if (fd == NULL) {
-		cerr << "Error: failed to open " + _filename << endl;
-		return -1;
-	}
-
-	short length;
-	unsigned char type;
+	uint16_t length;
 	display("parser\n\n");
 
 	/* Field 1 : misc header */
-	fread(&length, sizeof(short), 1, fd);
+	_fd.read((char*)&length, sizeof(uint16_t));
 	length = ntohs(length);
-	display("%d\n", length);
-	fseek(fd, length, SEEK_CUR);
-	fread(&length, sizeof(short), 1, fd);
+	_fd.seekg(length, _fd.cur);
+
+	_fd.read((char*)&length, sizeof(uint16_t));
 	length = ntohs(length);
-	display("%d\n", length);
 
 	/* process all field */
-	fread(&type, sizeof(unsigned char), 1, fd);
-	display("Field 2 %c\n", type);
-	parseField(type, fd);
-	fread(&type, sizeof(unsigned char), 1, fd);
-	display("Field 3 %c\n", type);
-	parseField(type, fd);
-	fread(&type, sizeof(unsigned char), 1, fd);
-	display("Field 4 %c\n", type);
-	parseField(type, fd);
-	fread(&type, sizeof(unsigned char), 1, fd);
-	display("Field 5 %c\n", type);
-	parseField(type, fd);
-	fread(&type, sizeof(unsigned char), 1, fd);
-	display("Field 6 %c\n", type);
-	parseField(type, fd);
+	do {} while (parseField());
 
 	display("results\n\n");
 
@@ -134,46 +115,28 @@ int BitParser::parse()
 	cout << "part name   : " << part_name << endl;
 	cout << "date        : " << date << endl;
 	cout << "hour        : " << hour << endl;
-	cout << "file length : " << file_length << endl;
+	cout << "file length : " << _bit_length << endl;
 
 	/* rest of the file is data to send */
-	bit_data = (unsigned char *)malloc(sizeof(unsigned char) * file_length);
-	if (bit_data == NULL) {
-		cerr << "Error: data buffer malloc failed" << endl;
-		return -1;
-	}
-	tmp_data = (unsigned char *)malloc(sizeof(unsigned char) * file_length);
-	if (tmp_data == NULL) {
-		cerr << "Error: data buffer malloc failed" << endl;
+	int pos = _fd.tellg();
+	cout << pos + _bit_length << endl;
+	_fd.read((char *)&_bit_data[0], sizeof(uint8_t) * _bit_length);
+	if (_fd.gcount() != _bit_length) {
+		cerr << "Error: data read different to asked length ";
+		cerr << to_string(_fd.gcount()) << " " << to_string(_bit_length) << endl;
 		return -1;
 	}
 
-	int pos = ftell(fd);
-	cout << pos + file_length << endl;
-	size_t ret = fread(tmp_data, sizeof(unsigned char), file_length, fd);
-	if (ret != (size_t)file_length) {
-		cerr << "Error: data read different to asked length" << endl;
-		return -1;
+	for (int i = 0; i < _bit_length; i++) {
+		_bit_data[i] = reverseByte(_bit_data[i]);
 	}
 
-	for (int i = 0; i < file_length; i++) {
-		bit_data[i] = reverseByte(tmp_data[i]);
-	}
-
-	fclose(fd);
-	free(tmp_data);
-
 	return 0;
 }
 
-unsigned char *BitParser::getData()
+uint8_t BitParser::reverseByte(uint8_t src)
 {
-	return bit_data;
-}
-
-unsigned char BitParser::reverseByte(unsigned char src)
-{
-	unsigned char dst = 0;
+	uint8_t dst = 0;
 	for (int i=0; i < 8; i++) {
 		dst = (dst << 1) | (src & 0x01);
 		src >>= 1;
diff --git a/bitparser.hpp b/bitparser.hpp
index c276784..51926f2 100644
--- a/bitparser.hpp
+++ b/bitparser.hpp
@@ -2,17 +2,18 @@
 #define BITPARSER_H
 
 #include <iostream>
+#include <fstream>
 
-class BitParser {
+#include "configBitstreamParser.hpp"
+
+class BitParser: public ConfigBitstreamParser {
 	public:
 		BitParser(std::string filename);
 		~BitParser();
 		int parse();
-		unsigned char *getData();
-		int getLength() {return file_length;}
 
 	private:
-		int parseField(unsigned char type, FILE *fd);
+		int parseField();
 		unsigned char reverseByte(unsigned char c);
 		std::string fieldA;
 		std::string part_name;
@@ -21,9 +22,6 @@ class BitParser {
 		std::string design_name;
 		std::string userID;
 		std::string toolVersion;
-		int file_length;
-		unsigned char *bit_data;
-		std::string _filename;
 };
 
 #endif