Test.java

import java.nio.ByteBuffer;
import java.util.*;

public class Test {

  private static byte[] encode(int c, String path) throws Exception {
    ByteBuffer buff = ByteBuffer.allocate(Integer.SIZE/8 + Character.SIZE/8 * path.length());
    buff
      .putInt(c)
      .asCharBuffer()
      .append(path);
    return buff.array();
  }

  private static void dump(byte[] bytes) throws Exception {
    ByteBuffer buff = ByteBuffer.wrap(bytes);
    int n    = buff.getInt();
    String p = buff.asCharBuffer().toString();
    System.out.format("%d - %s\n", n, p);
  }

  public static void main(String args[]) throws Exception {
    byte[] data = encode(100, "/foo/bar");
    dump(data);
  }

}

Bem da hora 0/