Extractor for a custom archvie format hidden in a firmware blob

Extractor.java

import java.io.*;

public class Extractor {
  public static void main(String[] args) {
    if (args.length != 2) {
      System.out.println("Specify a file and output dir!");
    } else {
      File in = new File(args[0]);
      File out = new File(args[1]);
      
      extract(in, out);
    }
  }
  
  private static void extract(File inFile, File out) {
    try {
      DataInputStream in = new DataInputStream(new FileInputStream(inFile));
        byte[] filenameBytes = new byte[60];
      while (in.available() > 0) {
        int nameLen = in.read(filenameBytes);
        char[] chars = new char[nameLen];
        for (int i = 0; i < nameLen; i++) {
          if (filenameBytes[i] == 0) {
            break;
          }
          chars[i] = (char)filenameBytes[i];
        }
        String name = new String(chars).trim();
        
        int length = in.readInt();
        
        extractFile(out, name, length, in);
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  
  private static void extractFile(File outDir, String name, int length, DataInputStream in) throws IOException {
    File outFile = new File(outDir, name);
    makeDirs(outFile);
    System.out.println("Extracting " + name + " to " + outFile.getPath());
    OutputStream out = new FileOutputStream(outFile);
    byte[] buff = new byte[length];
    int read = in.read(buff);
    if (read != length) {
      System.err.println("Number of read bytes did not match header!");
    }
    out.write(buff);
    out.close();
  }
  
  private static void makeDirs(File file) {
    String path = file.getPath();
    int idx = path.lastIndexOf('/');
    if (idx != -1) {
      File dir = new File(path.substring(0, idx + 1));
      dir.mkdirs();
    }
  }
}