What is the best way to deserialize the Byte Array in C++ which is in Big Endiaan format?

What is the best way to deserialize the Byte Array in C++ which is in Big
Endiaan format?

I am writing Byte Array value into a file using Java with Big Endian Byte
Order format.. Now I need to read that file from C++ program...
That Byte Array which I am writing into a file is made up of three Byte
Arrays as described below-
short employeeId = 32767;
long lastModifiedDate = "1379811105109L";
byte[] attributeValue = os.toByteArray();
I am writing employeeId , lastModifiedDate and attributeValue together
into a single Byte Array and that resulting Byte Array I am writing into a
file and then I will be having my C++ program which will retrieve that
Byte Array data from file and then deserialize it to extract employeeId ,
lastModifiedDate and attributeValue from it.
Below is my Java code which is writing Byte Array value into a file with
Big Endian format and it is working fine...
public class ByteBufferTest {
public static void main(String[] args) {
String text = "Byte Array Test For Big Endian";
byte[] attributeValue = text.getBytes();
long lastModifiedDate = 1289811105109L;
short employeeId = 32767;
int size = 2 + 8 + 4 + attributeValue.length; // short is 2 bytes,
long 8 and int 4
ByteBuffer bbuf = ByteBuffer.allocate(size);
bbuf.order(ByteOrder.BIG_ENDIAN);
bbuf.putShort(employeeId);
bbuf.putLong(lastModifiedDate);
bbuf.putInt(attributeValue.length);
bbuf.put(attributeValue);
bbuf.rewind();
// best approach is copy the internal buffer
byte[] bytesToStore = new byte[size];
bbuf.get(bytesToStore);
writeFile(bytesToStore);
}
/**
* Write the file in Java
* @param byteArray
*/
public static void writeFile(byte[] byteArray) {
try{
File file = new File("bytebuffertest");
FileOutputStream output = new FileOutputStream(file);
IOUtils.write(byteArray, output);
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
Now I need to retrieve Byte Array from that same file using the below C++
program and deserialize it to extract employeeId , lastModifiedDate and
attributeValue from it. I am not sure what is the best way on the C++
side. Below is the code I have got so far on C++ side-
int main() {
string line;
std::ifstream myfile("bytebuffertest", std::ios::binary);
if (myfile.is_open()) {
uint16_t employeeId;
uint64_t lastModifiedDate;
uint32_t attributeLength;
char buffer[8]; // sized for the biggest read we want to do
// read two bytes (will be in the wrong order)
myfile.read(buffer, 2);
// swap the bytes
std::swap(buffer[0], buffer[1]);
// only now convert bytes to an integer
employeeId = *reinterpret_cast<uint16_t*>(buffer);
cout<< employeeId <<endl;
// read eight bytes (will be in the wrong order)
myfile.read(buffer, 8);
// swap the bytes
std::swap(buffer[0], buffer[7]);
std::swap(buffer[1], buffer[6]);
std::swap(buffer[2], buffer[5]);
std::swap(buffer[3], buffer[4]);
// only now convert bytes to an integer
lastModifiedDate = *reinterpret_cast<uint64_t*>(buffer);
cout<< lastModifiedDate <<endl;
// read 4 bytes (will be in the wrong order)
myfile.read(buffer, 4);
// swap the bytes
std::swap(buffer[0], buffer[3]);
std::swap(buffer[1], buffer[2]);
// only now convert bytes to an integer
attributeLength = *reinterpret_cast<uint32_t*>(buffer);
cout<< attributeLength <<endl;
myfile.read(buffer, attributeLength);
// now I am not sure how should I get the actual attribute value
here?
//close the stream:
myfile.close();
}
else
cout << "Unable to open file";
return 0;
}
Can anybody take a look on C++ code and see what I can do to improve it as
I don't think so it is looking much efficient? Any better way to
deserialize the Byte Array and extract relevant information on the C++
side?
Thanks for the help..