I'm developing a JPEG decoder(I'm in the Huffman phase) and I want to write BinaryString's into a file. For example, let's say we've this:
String huff = "00010010100010101000100100";
I've tried to convert it to an integer spliting it by 8 and saving it integer represantation, as I can't write bits:
huff.split("(?<=\\G.{8})"))
int val = Integer.parseInt(str, 2);
out.write(val); //writes to a FileOutputStream
The problem is that, in my example, if I try to save "00010010" it converts it to 18 (10010), and I need the 0's.
And finally, when I read :
int enter;
String code = "";
while((enter =in.read())!=-1) {
code+=Integer.toBinaryString(enter);
}
I got :
Code = 10010
instead of:
Code = 00010010
Also I've tried to convert it to bitset and then to Byte[] but I've the same problem.
Your example is that you have the string "10010" and you want the string "00010010". That is, you need to left-pad this string with zeroes. Note that since you're joining the results of many calls to Integer.toBinaryString in a loop, you need to left-pad these strings inside the loop, before concatenating them.
while((enter = in.read()) != -1) {
String binary = Integer.toBinaryString(enter);
// left-pad to length 8
binary = ("00000000" + binary).substring(binary.length());
code += binary;
}