Re: Trying to understand some C/C++ code

Greetings all,

I am trying to understand a piece of C++ code that I am trying to port
to Java.

void Buffer::packInteger(int value){

  int netval = htonl(value); // convert to network order (big-endian)
  data = (char *) realloc(data, datalen + 4); //allocate datalen + 4
bytes to data

  char* temp = data + datalen; //temp is allocated a pointer to (data
+datalen) ?

  memcpy(temp, &netval, 4); // copy the first 4 bytes from netval to
temp;
  datalen += 4; //increment datalen by 4

 }
Now if I understood the comments in the code correctly, I can't seem
to understand how the integer called "value" is being packed even at
all in the code above!

My stab of the code above in Java is something like this -

public void packInteger(int value) {
                 //b is defined as byte b[ ] = new byte[4];
                b[0] = (byte) ((val >> 24) & 255);
                b[1] = (byte) ((val >> 16) & 255);
                b[2] = (byte) ((val >> 8) & 255);
                b[3] = (byte) (val & 255);