var tblEncodeString1= new Array
                        (
                            108,112,88,117,99,85,68,69,121,113,
                            81,51,106,111,70,80,77,74,86,104,
                            67,115,72,71,48,73,65,103,107,102,
                            49,110,114,83,98,82,50,100,54,75,
                            66,105,97,87,120,76,56,55,84,116,
                            79,109,52,78,118,89,57,53,119,101
                        );

  var tblEncodeString2= new Array
                        (
                            51,70,117,68,101,97,82,72,113,87,
                            76,88,108,104,99,71,106,115,121,56,
                            100,52,110,84,54,89,75,102,86,111,
                            109,67,85,66,116,53,78,120,119,118,
                            77,69,83,49,65,50,55,80,107,74,
                            112,79,98,105,57,114,73,48,103,81
                        );


function ExistsInBytes(b, s)
{

    for (var i=0; i<s.length; i++)
    {
      if(s[i]==parseInt(b,10))
        return i;
    }
    return -1;
}

function AdjustStringLen(s,len)
{
    if(s.length>=len)
        return s;
    var rc=new String;
    rc=s;
    while(rc.length<len)
    {
        rc = "0"+rc;
    }
    return rc;
}

function EncodeString(s)
{
    var rc="";
    
    if (s.length == 0)
        return rc;

    var i=0;
    var sb= new String;
    for (i = 0; i < s.length; i++)
    {
        var v=parseInt(s.charCodeAt(i).toString(16),16);
        if (v < 0x0FF)
        {          
            if (v == 90||v ==122)
            {
                sb+=String.fromCharCode(v);
                sb+="x";
                continue;
            }
            
            var nPos =ExistsInBytes(v, tblEncodeString1);
            if (nPos!=-1)
            {
                sb += String.fromCharCode(tblEncodeString2[nPos]);
                continue;
            }
            
            sb+="z"+AdjustStringLen(s.charCodeAt(i).toString(16),2);
        }
        else
        {
            sb+="Z" +AdjustStringLen(s.charCodeAt(i).toString(16).toUpperCase(),4) ;
        }
        
    }
    return sb;
}

function DecodeString(s)
{
    var rc=""
    if (s.length == 0)
        return rc;
    var sb = new String;
    var pos=0;
    while (pos < s.length)
    {
        var v=parseInt(s.charCodeAt(pos).toString(16),16);
        if (v != 90&&v!=122)
        {
            var nPos = ExistsInBytes(v, tblEncodeString2);
            if (nPos == -1)
                return "";
            sb+=String.fromCharCode(tblEncodeString1[nPos]);
            pos++;
        }
        else
        {
            if (s.charCodeAt(pos + 1) <=121  && s.charCodeAt(pos + 1) >= 103)  //'z' 'y'
            {
                sb+=String.fromCharCode(v);
                pos += 2;
                continue;
            }

            if (v == 122)//'z'
            {
                if (pos + 3 > s.Length)
                {
                    return "";
                }
                var v=parseInt(s.charAt(pos + 1),16)*16+parseInt(s.charAt(pos + 2),16);
                sb+=String.fromCharCode(v);
                pos += 3;
            }
            else
            {
                if (pos + 5 > s.Length)
                {
                    return "";
                }
                var value=parseInt(s.charAt(pos + 1),16) * 16 * 16 * 16 + parseInt(s.charAt(pos + 2),16) * 256 + parseInt(s.charAt(pos + 3),16) * 16 + parseInt(s.charAt(pos + 4),16);
                sb+=String.fromCharCode(value);
                pos += 5;
            }
            
        }
    }
    return sb;
}



function IntToStr(value,radix,len)
{ 
  var rc=value.toString(radix);
  for(i=0; i<len-rc.length;i++)
  {
    rc = "0"+rc;
  }
  return rc;
}

function EncodeStrings()
{
    var argv = EncodeStrings.arguments;
    var argc = EncodeStrings.arguments.length;
    var maxLen=0;
    var i=0;
    for(i=0; i<argc;i++)
    {
      if(argv[i].length>maxLen)
        maxLen = argv[i].length;
    }
    if(maxLen>0x0FFF)////×ÔÊÐí 0xFFF
      return "";
              
    var value = "";
    for (i = 0; i < argc; i++)
    {
        if(maxLen<100)
        {
          value += IntToStr(argv[i].length,10,2)+argv[i];
        }
        else
        {
          value += IntToStr(argv[i].length,16,3)+argv[i];
        }
    }
    
    var date = new Date();
    if (maxLen <= 99)
        value = "168"+IntToStr(date.getHours(),10,2)+IntToStr(date.getMinutes(),10,2) + value;    
    else if (maxLen > 99 && maxLen <= 0x0FF)
        value = "167"+IntToStr(date.getHours(),10,2)+IntToStr(date.getMinutes(),10,2) + value;    
    else
        value = "166"+IntToStr(date.getHours(),10,2)+IntToStr(date.getMinutes(),10,2) + value;    

    var amount = 0;
    for (i = 0; i < value.length; i++)
    {
       amount += value.charCodeAt(i);
    }
    amount = amount % 100;
    value += IntToStr(amount,10,2);
    return value;
    
}

function DecodeStrings(value)
{  
    if (value.Length < 12)
        return null;

    var s=value.substring(0,3);
    if ((s!="168")&&(s!="167")&&(s!="166"))
        return null;
        
    var nTag=0,nLen=2;
    if(s=="167")
        nTag = 1;
    else if (s=="166")
    {
        nLen = 3;
        nTag = 2;
    }
  
    var temp = value.substring(3, 7);
    
    if(isNaN(parseInt(temp)))
      return null;
 
    var amount = 0;
    var i=0;
    for (i = 0; i < value.length-2; i++)
    {
       amount += value.charCodeAt(i);
    }
    amount = amount % 100;
    if (value.substring(value.length - 2,value.length) != IntToStr(amount,10,2))
    {
        return null;
    }

    var arr = new Array();
    var count = 0;
    var mid = value.substring(7, value.length-2);
    while (true)
    {
        
        temp = mid.substring(0, nLen);
        var strlen = 0;
        if (nTag == 0)
            strlen = parseInt(temp);
        else//hex
            strlen = parseInt(temp,16);
            
        if(isNaN(strlen))
          return null;
        if (mid.length < nLen + strlen)
            return null;

        arr[count++] = mid.substring(nLen, strlen+nLen);
        if (mid.length > nLen + strlen)
        {
            mid = mid.substring(nLen + strlen,mid.length);
        }
        else
            break;

    }
    return arr;
  
}