package org.paneris.bibliomania.fti;

 import java.io.IOException;

 import java.io.OutputStream;

 /** 

  * A family of classes to pack numbers into as small a size as possible. 

  * Need to know: http://docs.oracle.com/javase/tutorial/java/nutsandbolts/op3.html

  * 

  * @author williamc

  * @since 2000-05-22

  */

 public abstract class Packer {

   /** Unsigned int from byte. */

   public static int uint(byte b) {

     return b >= 0 ? b : 256 + b;

   }

   private int numberLength;

   private int numberMax;

   /** 

    * 

    * @param numberLength number of bytes

    * @param numberMax maximum representable

    */

   protected Packer(int numberLength, int numberMax) {

     this.numberLength = numberLength;

     this.numberMax = numberMax;

   }

   public final int numberLength() {

     return numberLength;

   }

   public final int numberMax() {

     return numberMax;

   }

   public abstract int number(byte[] bytes, int off);

   public abstract Packer bigger();

   public abstract void write(OutputStream os, int number) throws IOException;

 }