Variable Byte Code(sample)

gistfile1.java

import gnu.trove.TByteArrayList;
import java.util.Arrays;


public class VariableByte {
	public static byte[] encode(int[] numbers) {
		TByteArrayList result = new TByteArrayList(numbers.length * 4);
		TByteArrayList buf = new TByteArrayList();
		for(int number : numbers){
			buf.clear();
			int num = number;
			while (true) {
				byte b = (byte)(num % 128);
				buf.insert(0, b);
				num = num >> 7;     
				if(num <= 0){
					break;
				}
			}
			byte last = (byte)(buf.get(buf.size() - 1) + (byte)0x80);
			buf.set(buf.size() - 1, last);
			result.add(buf.toNativeArray());
		}
		return result.toNativeArray();
	}

	public static int[] decode(byte[] encoded){
		int[] buf = new int[encoded.length];
		int num = 0;
		int index = 0;
		for(int i = 0 ; i < encoded.length ; i++){
			byte b = encoded[i]; 
			if (b >= 0) {       
				num = (num << 7) + b;
			} else {             
				buf[index++] = (num << 7) + (byte)(b - (byte)0x80);   
				num = 0;            
			}
		}
		return Arrays.copyOfRange(buf, 0, index);
 	}

	public static void main(String[] args)  {
		int[] numbers = new int[args.length];
		System.out.println("origin size:" + (numbers.length * 4));
		for(int i = 0 ; i < args.length ; i++){
			numbers[i] = Integer.parseInt(args[i]);
			System.out.print(numbers[i] + " ");
		}
		System.out.println();
		byte[] encoded = encode(numbers);
	
		System.out.println("encoded size:" + (encoded.length));
		for(int i = 0 ; i < encoded.length ; i++){
			System.out.print(encoded[i] + " ");
			if(encoded[i] >= 0){
				System.out.print(" ");
			}else{
				System.out.print(" / ");
			}
		}
		System.out.println();
	
		int[] decoded = decode(encoded);
	
		System.out.println("decoded size:" + (decoded.length * 4));
		for(int i = 0 ; i < decoded.length ; i++){
			System.out.print(decoded[i] + " ");
		}
		System.out.println();
	}
}