java convert hex to binary method
/**
* Method receives String hexadecimal value and returns a String of a binary representation
* hexadecimal string format (ex.:"2FFA")
* Only works with positive hexadecimal values (16xF does not work)
* Uses 2 for loops (hex -> dec & dec -> bin)
*/
private static int[] parseHexBinary(String hex) {
String digits = "0123456789ABCDEF";
int[] binaryValue = new int[hex.length()*4];
long val = 0;
// convert hex to decimal
for(int i = 0; i < hex.length(); i++) {
char c = hex.charAt(i);
int d = digits.indexOf(c);
val = val*16 + d;
}
// convert decimal to binary
for(int i = 0; i < binaryValue.length; i++) {
binaryValue[i] = (int) (val%2);
val = val/2;
}
return binaryValue;
}