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BT（BitTorrent）文件操作工具
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/*
 * Created on 2 juil. 2003
 *
 */
package net.javaw.util;

/**
 * @author Olivier
 * 
 */

import net.javaw.torrent.TOTorrent;
import net.javaw.torrent.TOTorrentException;

public class ByteFormatter
{
   public static String nicePrintTorrentHash(TOTorrent	torrent )
  {
  	return( nicePrintTorrentHash( torrent, false ));
  }
  
  public static String nicePrintTorrentHash(TOTorrent	torrent, boolean tight)
  {
	byte[]	hash;
	
	if ( torrent == null ){
		
		hash = new byte[20];
	}else{
		try{
			hash = torrent.getHash();
			
		}catch( TOTorrentException e ){
			
			e.printStackTrace();
			
			hash = new byte[20];
		}
	}

	return( nicePrint( hash, tight ));
  }

  public static String
  nicePrint(
  	String	str )
  {
  	return( nicePrint(str.getBytes(),true));
  }
  public static String nicePrint(byte[] data) {
	 return( nicePrint( data, false ));
   }
    
  public static String nicePrint(byte[] data, boolean tight) {
    if(data == null)
      return "";      
    String out = "";    
    for (int i = 0; i < data.length; i++) {
      out = out + nicePrint(data[i]);
      if (!tight && (i % 4 == 3))
        out = out + " ";
    }
    return out;
  }


  public static String nicePrint(byte b) {
    byte b1 = (byte) ((b >> 4) & 0x0000000F);
    byte b2 = (byte) (b & 0x0000000F);
    return nicePrint2(b1) + nicePrint2(b2);
  }


  public static String nicePrint2(byte b) {
    String out = "";
    switch (b) {
      case 0 :
        out = "0";
        break;
      case 1 :
        out = "1";
        break;
      case 2 :
        out = "2";
        break;
      case 3 :
        out = "3";
        break;
      case 4 :
        out = "4";
        break;
      case 5 :
        out = "5";
        break;
      case 6 :
        out = "6";
        break;
      case 7 :
        out = "7";
        break;
      case 8 :
        out = "8";
        break;
      case 9 :
        out = "9";
        break;
      case 10 :
        out = "A";
        break;
      case 11 :
        out = "B";
        break;
      case 12 :
        out = "C";
        break;
      case 13 :
        out = "D";
        break;
      case 14 :
        out = "E";
        break;
      case 15 :
        out = "F";
        break;
    }
    return out;
  }

  public static String
  encodeString(
  	byte[]		bytes )
  {
  	return( nicePrint( bytes, true ));
  }
  
  public static byte[]
  decodeString(
  	String		str )
  {
  	char[]	chars = str.toCharArray();
  	
  	int	chars_length = chars.length - chars.length%2;
  	
  	byte[]	res = new byte[chars_length/2];
  	
  	for (int i=0;i