import java.io.*;

public class CopyBinFile {
  public static void main(String [] args) {
    if (args.length < 2) {
      System.err.println("Insufficient number of arguments!");
      return;
    }
    
    File readFile = new File(args[0]);
    File writeFile = new File(args[1]);
    
    if( !readFile.isFile() ) {
      System.err.println("Input file does not exist or is not a regular file!");
      return;
    }
    if( !readFile.canRead() ) {
      System.err.println("Input file is not readable!");
      return;
    }
    if( writeFile.exists() ) {
      System.err.println("Output file exists! Unable to overwrite.");
      return;
    }
    
    try {
      byte []buffer = new byte[2048];
      FileInputStream in = new FileInputStream(readFile);
      FileOutputStream out = new FileOutputStream(writeFile);
      int read_len;
      while( (read_len = in.read(buffer)) != -1 ) {
        out.write(buffer, 0, read_len);
      }
      out.close();
      in.close();
    } catch( IOException ex ) {
      ex.printStackTrace();
    }
  }
}