/*
 * Created on Nov 12, 2003
 * Created by Alon Rohter
 * Copyright (C) 2003-2004 Alon Rohter, All Rights Reserved.
 * Copyright (C) 2003, 2004, 2005, 2006 Aelitis, All Rights Reserved.
 * Modified for I2PSnarkXL by fwd
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * AELITIS, SAS au capital de 46,603.30 euros
 * 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
 *
 */
package org.i2p.i2psnarkxl.peermanager.utils;


import java.io.*;


/**
 * Used for identifying clients by their peerID.
 */
public class BTPeerIDByteDecoder {
    
    public static final String BYTE_ENCODING 		= "ISO-8859-1";
        /*final static boolean LOG_UNKNOWN;
         
        static{
                String	prop = System.getProperty("log.unknown.peerids");
         
                LOG_UNKNOWN = prop != null && prop.equals("1");
        }*/
    
    /**
     * Decodes the given peerID, returning an identification string.
     */
    public static String decode(byte[] peer_id) {
        String decoded = null;
        byte[] peerID = new byte[peer_id.length];
        System.arraycopy(peer_id, 0, peerID, 0, peer_id.length);
        
        //FileWriter log = null;
        //File logFile = FileUtil.getUserFile("identification.log");
        
        int iFirstNonZeroPos = 0;
        try {
            if( (decoded = decodeAzStyle( peerID, "AZ", "Azureus" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "BC", "BitComet" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "LT", "libtorrent (Rasterbar)" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "lt", "libTorrent (Rakshasa)" )) != null ) return decoded;
//      if( (decoded = decodeAzStyle( peerID, "AR", "Arctic Torrent" )) != null ) return decoded; //based on libtorrent but same peerid for different versions
            if( (decoded = decodeAzStyle( peerID, "TS", "TorrentStorm" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "MT", "MoonlightTorrent" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "XT", "XanTorrent" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "bk", "BitKitten (libtorrent)" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "CT", "CTorrent" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "SN", "ShareNET" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "BB", "BitBuddy" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "SS", "SwarmScope" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "BS", "BTSlave" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "BX", "BittorrentX" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "TN", "Torrent.NET" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "ZT", "ZipTorrent" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "SZ", "Shareaza" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "KT", "KTorrent" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "UT", "\u00B5Torrent" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "TR", "Transmission" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "CD", "CTorrent" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "RT", "Retriever" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "LP", "Lphant" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "PC", "CacheLogic" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "BR", "BitRocket" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "XX", "Xtorrent" )) != null ) return decoded;
            if( (decoded = decodeAzStyle( peerID, "FG", "FlashGet" )) != null ) return decoded;
            
            if( (decoded = decodeTornadoStyle( peerID, "T", "BitTornado" )) != null ) return decoded;
            if( (decoded = decodeTornadoStyle( peerID, "A", "ABC" )) != null ) return decoded;
            if( (decoded = decodeTornadoStyle( peerID, "O", "Osprey permaseed" )) != null ) return decoded;
            if( (decoded = decodeTornadoStyle( peerID, "R", "Tribler" )) != null ) return decoded;
            
            if( (decoded = decodeMainlineStyle( peerID, "M", "Mainline" )) != null ) return decoded;
            
            if( (decoded = decodeSimpleStyle( peerID, 0, "martini", "Martini Man" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "oernu", "BTugaXP" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "BTDWV-", "Deadman Walking" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "PRC.P---", "BitTorrent Plus! II" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "P87.P---", "BitTorrent Plus!" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "S587Plus", "BitTorrent Plus!" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 5, "Azureus", "Azureus 2.0.3.2" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "-G3", "G3 Torrent" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "-AR", "Arctic Torrent" )) != null ) return decoded; //no way to know the version (see above)
            if( (decoded = decodeSimpleStyle( peerID, 0, "-BF", "Bitflu" )) != null ) return decoded; //no way to know the version (see above)
            if( (decoded = decodeSimpleStyle( peerID, 4, "btfans", "SimpleBT" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "btuga", "BTugaXP" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 5, "BTuga", "BTugaXP" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "DansClient", "XanTorrent" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "Deadman Walking-", "Deadman" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "346-", "TorrentTopia" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "271-", "GreedBT 2.7.1" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 10, "BG", "BTGetit" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "OP", "Opera" )) != null ) return decoded;
            
            
            if( (decoded = decodeSimpleStyle( peerID, 0, "a00---0", "Swarmy" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "a02---0", "Swarmy" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 0, "T00---0", "Teeweety" )) != null ) return decoded;
            
            if( (decoded = decodeSimpleStyle( peerID, 0, "10-------", "JVtorrent" )) != null ) return decoded;
            
            if( (decoded = decodeSimpleStyle( peerID, 0, "LIME", "Limewire" )) != null ) return decoded;
            
            
            String burst = new String(peerID, 0, 5, BYTE_ENCODING);
            if( burst.equals( "Mbrst" ) ) {
                String major = new String(peerID, 5, 1, BYTE_ENCODING);
                String minor = new String(peerID, 7, 1, BYTE_ENCODING);
                String sub   = new String(peerID, 9, 1, BYTE_ENCODING);
                return "Burst! " + major + "." + minor + "." + sub;
            }
            
            String turbobt = new String(peerID, 0, 7, BYTE_ENCODING);
            if (turbobt.equals("turbobt")) {
                return "TurboBT " + new String(peerID, 7, 5, BYTE_ENCODING);
            }
            
            
            String btpd = new String( peerID, 0, 4, BYTE_ENCODING );
            if( btpd.equals( "btpd" ) ) {
                return "BT Protocol Daemon " + new String( peerID, 5, 3, BYTE_ENCODING );
            }
            
            
            //not 100% sure on this one
            String plus = new String(peerID, 0, 4, BYTE_ENCODING);
            if( plus.equals( "Plus" ) ) {
                String v1 = new String(peerID, 4, 1, BYTE_ENCODING);
                String v2 = new String(peerID, 5, 1, BYTE_ENCODING);
                String v3 = new String(peerID, 6, 1, BYTE_ENCODING);
                return "Plus! " + v1 + "." + v2 + "." + v3;
            }
            
            String xbt = new String(peerID, 0, 3, BYTE_ENCODING);
            if( xbt.equals( "XBT" ) ) {
                String v1 = new String(peerID, 3, 1, BYTE_ENCODING);
                String v2 = new String(peerID, 4, 1, BYTE_ENCODING);
                String v3 = new String(peerID, 5, 1, BYTE_ENCODING);
                return "XBT " + v1 + "." + v2 + "." + v3;
            }
            
            String bow = new String(peerID, 1, 3, BYTE_ENCODING);
            if( bow.equals( "BOW" ) ) {
                String version = new String(peerID, 4, 3, BYTE_ENCODING);
                return "BitsOnWheels " + version;
            }
            
            String exeem = new String(peerID, 0, 2, BYTE_ENCODING);
            if( exeem.equals( "eX" ) ) {
                String user = new String(peerID, 2, 18, BYTE_ENCODING);
                return "eXeem [" +user+ "]";
            }
            
            
            String shadow = new String(peerID, 0, 1, BYTE_ENCODING);
            if (shadow.equals("S")) {
                try {
                    if ( (peerID[6] == (byte)45) && (peerID[7] == (byte)45) && (peerID[8] == (byte)45) ) {
                        String name = "Shad0w ";
                        for (int i = 1; i < 3; i++) {
                            String v = new String(peerID, i, 1, BYTE_ENCODING);
                            name = name.concat( Integer.parseInt(v, 16) + "." );
                        }
                        String v = new String(peerID, 3, 1, BYTE_ENCODING);
                        name = name.concat( "" + Integer.parseInt(v, 16) );
                        return name;
                    }
                    
                    if (peerID[8] == (byte)0) {
                        String name = "Shad0w ";
                        for (int i = 1; i < 3; i++) {
                            name = name.concat(String.valueOf(peerID[i]) + ".");
                        }
                        name = name + String.valueOf(peerID[3]);
                        return name;
                    }
                } catch( Exception e ) {
                    /* NumberFormatException, for peerid like [S-----------A---$H-"] */
                }
            }
            
            String bitspirit = new String(peerID, 2, 2, BYTE_ENCODING);
            if (bitspirit.equals("BS")) {
                if (peerID[1] == (byte)0)  return "BitSpirit v1";
                if (peerID[1] == (byte)2)  return "BitSpirit v2";
            }
            
            String upnp = new String(peerID, 0, 1, BYTE_ENCODING);
            if (upnp.equals("U")) {
                if (peerID[8] == (byte)45) {
                    String version = new String(peerID, 1, 3, BYTE_ENCODING);
                    String name = "UPnP ";
                    for (int i = 0; i < 2; i++) {
                        name = name.concat(version.charAt(i) + ".");
                    }
                    name = name + version.charAt(2);
                    return name;
                }
            }
            
            
            String bitcomet = new String(peerID, 0, 4, BYTE_ENCODING);
            if (bitcomet.equals("exbc") || bitcomet.equals("FUTB") || bitcomet.equals("xUTB")) {
                String lord = new String(peerID, 6, 4, BYTE_ENCODING);
                String name;
                if ( lord.equals( "LORD" ) ) {
                    name = "BitLord ";
                    String versionNumber = String.valueOf(peerID[4]);
                    name = name.concat(versionNumber + ".");
                    if (versionNumber.equals( "0" )) { // still follows the old BitComet decoding
                        name = name.concat(String.valueOf(peerID[5]/10));
                        name = name.concat(String.valueOf(peerID[5]%10));
                    } else {
                        name = name.concat(String.valueOf(peerID[5]%10));
                    }
                    
                } else {
                    name = "BitComet ";
                    if ( bitcomet.equals("FUTB")) name = name.concat("Mod1 ");
                    if ( bitcomet.equals("xUTB")) name = name.concat("Mod2 ");
                    name = name.concat(String.valueOf(peerID[4]) + ".");
                    name = name.concat(String.valueOf(peerID[5]/10));
                    name = name.concat(String.valueOf(peerID[5]%10));
                }
                
                return name;
            }
            
            String rufus = new String(peerID, 2, 2, BYTE_ENCODING);
            if (rufus.equals("RS")) {
                String name = "Rufus ";
                name = name.concat(String.valueOf(peerID[0]) + ".");
                name = name.concat(String.valueOf(peerID[1]/10) + ".");
                name = name.concat(String.valueOf(peerID[1]%10));
                return name;
            }
            
            String mldonkey = new String(peerID, 1, 2, BYTE_ENCODING);
            if (mldonkey.equals("ML")) {
                String name = "mldonkey ";
                String v1 = new String(peerID, 3, 1, BYTE_ENCODING);
                String v2 = new String(peerID, 5, 1, BYTE_ENCODING);
                String v3 = new String(peerID, 7, 1, BYTE_ENCODING);
                return name + v1 + "." + v2 + "." + v3;
            }
            
            /*
            String robert = new String(peerID, 2, 11, BYTE_ENCODING);
            if (robert.equals("FUAnonymous")) {
                String name = "Robert ";
                name = name.concat(String.valueOf(peerID[0]) + ".");
                name = name.concat(String.valueOf(peerID[1]/10) + ".");
                name = name.concat(String.valueOf(peerID[1]%10));
                return name;
            }else if (robert.startsWith("FU")) {
                String name = "Robert (Fork) ";
                name = name.concat(String.valueOf(peerID[0]) + ".");
                name = name.concat(String.valueOf(peerID[1]/10) + ".");
                name = name.concat(String.valueOf(peerID[1]%10));
                return name;
            }
            */
            
             String robert = new String(peerID, 2, 11, BYTE_ENCODING);
            if (robert.equals("FUAnonymous")) {
                String name = "Robert ";
                name = name.concat(String.valueOf(peerID[0]) + ".");
                name = name.concat(String.valueOf(peerID[1]/10) + ".");
                name = name.concat(String.valueOf(peerID[1]%10));
                return name;
            }else if (robert.startsWith("FU")) {//todo: it is not a fork, it's a nickname!'
                String name = "Robert (Fork) ";
                name = name.concat(String.valueOf(peerID[0]) + ".");
                name = name.concat(String.valueOf(peerID[1]/10) + ".");
                name = name.concat(String.valueOf(peerID[1]%10));
                return name;
            }
       
       String robert2 = new String(peerID, 0, 3, BYTE_ENCODING);
       //Unknown 0[UFO---Anonymous@--D-]
       //Unknown 0[UFO---ahope-------+-]
            if (robert2.equals("UFO")) {
                String name = "Robert ";
                name = name.concat(String.valueOf(peerID[3]) + ".");
                name = name.concat(String.valueOf(peerID[4]/10) + ".");
                name = name.concat(String.valueOf(peerID[5]) );
                
                int iStartAtPos = 6;
                int iFirstZeroPos = peerID.length;                
                                
                try {
                    for (int i = iStartAtPos; i < peerID.length; i++) {
                        int b = (0xFF & peerID[i]);
                        if (b < 32 || b > 127){
                            iFirstZeroPos = i;
                            break;
                        }                            
                    }
                    String	nick = "";
                    nick = new String(peerID, iStartAtPos, iFirstZeroPos - iStartAtPos,
                            BYTE_ENCODING);
                    name = name + " [" + nick +"]";
                } catch (UnsupportedEncodingException ignore) {} catch (Exception e) {}
                
                return name;
            }
       
            String pyBit = new String(peerID, 0, 3, BYTE_ENCODING);
            if (pyBit.equals("-PB")) {//see MultiBt.py class MultiBt 
                //self.peerId = '-PB' + shortIntToBinary(versionDigits[0]) + shortIntToBinary(versionDigits[1]) +\ shortIntToBinary(versionDigits[2]) + generateRandomBinary(14)
                String name = "PyBit ";
                name = name.concat(String.valueOf(peerID[3]) + ".");
                name = name.concat(String.valueOf(peerID[4]) + ".");
                name = name.concat(String.valueOf(peerID[5]) );
                return name;
            }
            
            iFirstNonZeroPos = 20;
            for( int i=0; i < 20; i++ ) {
                if( peerID[i] != (byte)0 ) {
                    iFirstNonZeroPos = i;
                    break;
                }
            }
            
            
            //Shareaza check
            if( iFirstNonZeroPos == 0 ) {
                boolean bShareaza = true;
                for( int i=0; i < 16; i++ ) {
                    if( peerID[i] == (byte)0 ) {
                        bShareaza = false;
                        break;
                    }
                }
                if( bShareaza ) {
                    for( int i=16; i < 20; i++ ) {
                        if( peerID[i] != ( peerID[i % 16] ^ peerID[15 - (i % 16)] ) ) {
                            bShareaza = false;
                            break;
                        }
                    }
                    if( bShareaza )  return "Shareaza";
                }
            }
            
            
//      if( iFirstNonZeroPos == 8 ) {
            if( (decoded = decodeSimpleStyle( peerID, 16, "UDP0", "BitComet UDP" )) != null ) return decoded;
            if( (decoded = decodeSimpleStyle( peerID, 14, "HTTPBT", "BitComet HTTP" )) != null ) return decoded;
            
//      }
            
            byte three = (byte)3;
            if ((iFirstNonZeroPos == 9)
            && (peerID[9] == three)
            && (peerID[10] == three)
            && (peerID[11] == three)) {
                return "I2PSnark";
            }
            
            byte i2psnarkxl = (((3 + 7 + 10) * (1000 - 8)) / 992) - 17 + 8;
            if ((iFirstNonZeroPos == 9)
            && (peerID[9] == i2psnarkxl)
            && (peerID[10] == i2psnarkxl)
            && (peerID[11] == i2psnarkxl)) {
                return "XL";
            }
            if ((iFirstNonZeroPos == 12) && (peerID[12] == (byte)97) && (peerID[13] == (byte)97)) {
                return "Experimental 3.2.1b2";
            }
            if ((iFirstNonZeroPos == 12) && (peerID[12] == (byte)0) && (peerID[13] == (byte)0)) {
                return "Experimental 3.1";
            }
            if (iFirstNonZeroPos == 12) return "Mainline";
            
        } catch (Exception e) {
            e.printStackTrace();
            //Debug.out( "[" +new String( peerID )+ "]", e );
        }
        
        
        
        String sPeerID = getPrintablePeerID( peerID, iFirstNonZeroPos );
        
        
        return /*MessageText.getString("PeerSocket.unknown") + " " +*/ "Unknown " + iFirstNonZeroPos +"[" + sPeerID + "]";
    }
    
    
    
    private static String decodeAzStyle(byte[] id, String ident, String name) {
        try {
            if ((id[0] == (byte) 45) && (id[7] == (byte) 45)) {
                String decoded = new String(id, 1, 2, BYTE_ENCODING);
                if (decoded.equals(ident)) {
                    if (ident.equals("BC")) {
                        // 4.56
                        String v2 = parseOneByteVersionNumber(id, 4);
                        String v3 = parseOneByteVersionNumber(id, 5);
                        String v4 = parseOneByteVersionNumber(id, 6);
                        return name + " " + v2 + "." + v3 + v4;
                    }
                    if (ident.equals("KT")) {
                        // 3.4.5=[RD].6
                        String v2 = parseOneByteVersionNumber(id, 3);
                        String v3 = parseOneByteVersionNumber(id, 4);
                        String v4 = new String(id, 5, 1, BYTE_ENCODING);
                        String v5 = parseOneByteVersionNumber(id, 6);
                        return name
                                + " "
                                + v2
                                + "."
                                + v3
                                + (v4.equals("R") ? (" RC" + v5) : (v4.equals("D") ? " Dev"
                                : ""));
                    }
                    if (ident.equals("UT")) {
                        // 3.4.5
                        String v2 = parseOneByteVersionNumber(id, 3);
                        String v3 = parseOneByteVersionNumber(id, 4);
                        String v4 = parseOneByteVersionNumber(id, 5);
                        return name + " " + v2 + "." + v3 + "." + v4;
                    }
                    if (ident.equals("TR") || ident.equals("CD") || ident.equals("FG")) {
                        // 34.56
                        String v2 = new String(id, 3, 2, BYTE_ENCODING);
                        String v3 = new String(id, 5, 2, BYTE_ENCODING);
                        return name + " " + Integer.parseInt(v2) + "."
                                + Integer.parseInt(v3);
                    }
                    if (ident.equals("BR")) {
                        // 3.4(56)
                        String v2 = parseOneByteVersionNumber(id, 3);
                        String v3 = parseOneByteVersionNumber(id, 4);
                        String v4 = new String(id, 5, 2, BYTE_ENCODING);
                        return name + " " + v2 + "." + v3 + "(" + Integer.parseInt(v4)
                        + ")";
                    }
                    
                    if (ident.equals("XX")) {
                        // v1234
                        String v = new String(id, 3, 4, BYTE_ENCODING);
                        return name + " v" + Integer.parseInt(v);
                    }
                    
                    String v1 = parseOneByteVersionNumber(id, 3);
                    String v2 = parseOneByteVersionNumber(id, 4);
                    String v3 = parseOneByteVersionNumber(id, 5);
                    String v4 = parseOneByteVersionNumber(id, 6);
                    return name + " " + v1 + "." + v2 + "." + v3 + "." + v4;
                }
            }
        } catch (Exception e) {
            return null;
        }
        return null;
    }
    
    private static String decodeTornadoStyle( byte[] id, String ident, String name ) {
        try {
            if( (id[4] == (byte)45) && (id[5] == (byte)45) ) {
                if( (id[6] == (byte)45) && (id[7] == (byte)45) && (id[8] == (byte)45)) {
                    String decoded = new String( id, 0, 1, BYTE_ENCODING );
                    if( decoded.equals( ident ) ) {
                        String v1 = parseOneByteVersionNumber(id, 1);
                        String v2 = parseOneByteVersionNumber(id, 2);
                        String v3 = parseOneByteVersionNumber(id, 3);
                        return name + " " + v1 + "." + v2 + "." + v3;
                    }
                }
                
                if( (id[6] == (byte)48) ) {
                    String decoded = new String( id, 0, 1, BYTE_ENCODING );
                    if( decoded.equals( ident ) ) {
                        String v1 = parseOneByteVersionNumber(id, 1);
                        String v2 = parseOneByteVersionNumber(id, 2);
                        String v3 = parseOneByteVersionNumber(id, 3);
                        if(ident.equals("T")){
                            return name + " LM" + " " + v1 + "." + v2 + "." + v3;
                        } else {
                            return name +  " " + v1 + "." + v2 + "." + v3;
                        }
                    }
                }
            }
            if( (id[4] == (byte)48) && (id[5] == (byte)45) && (id[6] == (byte)45)  ) {
                String decoded = new String( id, 0, 1, BYTE_ENCODING );
                if( decoded.equals( ident ) ) {
                    return "TorrentFlux";
                }
            }
        } catch( Exception e ) {  return null;  }
        return null;
    }
    
    
    private static String decodeSimpleStyle( byte[] id, int start_pos, String ident, String name ) {
        try {
            String decoded = new String( id, start_pos, ident.length(), BYTE_ENCODING );
            if( decoded.equals( ident ) ) return name;
        } catch( Exception e ) {  return null;  }
        return null;
    }
    
    
    private static String decodeMainlineStyle( byte[] id, String ident, String name ) {
        try {
            
            // Mx-y-z--
            // where version = x.y.z
            if ( (id[2] == (byte)45) && (id[4] == (byte)45) && (id[6] == (byte)45) && (id[7] == (byte)45) ) {
                String decoded = new String( id, 0, 1, BYTE_ENCODING );
                if( decoded.equals( ident ) ) {
                    String v1 = new String( id, 1, 1, BYTE_ENCODING );
                    String v2 = new String( id, 3, 1, BYTE_ENCODING );
                    String v3 = new String( id, 5, 1, BYTE_ENCODING );
                    return name + " " + v1 + "." + v2 + "." + v3;
                }
            }
            // Mx-yy-z-
            // where version = x.yy.z
            if ( (id[2] == (byte)45) && (id[5] == (byte)45) && (id[7] == (byte)45) ) {
                String decoded = new String( id, 0, 1, BYTE_ENCODING );
                if( decoded.equals( ident ) ) {
                    String v1 = new String( id, 1, 1, BYTE_ENCODING );
                    String v2 = new String( id, 3, 2, BYTE_ENCODING );
                    String v3 = new String( id, 6, 1, BYTE_ENCODING );
                    return name + " " + v1 + "." + v2 + "." + v3;
                }
            }
        } catch( Exception e ) {  return null;  }
        return null;
    }
    
    
    
    protected static String
            getPrintablePeerID(
            byte[]		peer_id,
            int iStartAtPos ) {
        String	sPeerID = "";
        byte[] peerID = new byte[ peer_id.length ];
        System.arraycopy( peer_id, 0, peerID, 0, peer_id.length );
        
        try {
            for (int i = iStartAtPos; i < peerID.length; i++) {
                int b = (0xFF & peerID[i]);
                if (b < 32 || b > 127)
                    peerID[i] = '-';
            }
            sPeerID = new String(peerID, iStartAtPos, peerID.length - iStartAtPos,
                    BYTE_ENCODING);
        } catch (UnsupportedEncodingException ignore) {} catch (Exception e) {}
        
        return( sPeerID );
    }
    
    public static String parseOneByteVersionNumber(byte[] byteArray, int pos) {
        try {
            return ""
                    + Integer.parseInt(new String(byteArray, pos, 1,
                    BYTE_ENCODING), 36);
        } catch (Exception e) {
        }
        
        return "" + byteArray[pos];
    }
  /*
  public static void main(String[] args) {
        for (int i = 0; i < 26; i++) {
                System.out.println((char)('a' + i) + ":" + parseOneByteVersionNumber(new byte[] { (byte)('a' + i) }, 0));
        }
        }
   *
   */
}
