ascii 2 nativeトランスコード復号

 // 
function asciiHex2native(strAscii) {
  var output = "";
  var posFrom = 0;
  var posTo = strAscii.indexOf("\\x", posFrom);
  while (posTo >= 0) {
    output += strAscii.substring(posFrom, posTo);
    var s="";
    s=strAscii.substr(posTo, 4).replace("\\x","")
    var arr=s.split(""), n=arr.length,k=0, s=0
    for(var i=0;i<n;i++){
      k=n-i-1;
      var a=arr[i].toLocaleLowerCase();
      if(a=="a"){a=10;}
      else if(a=="b"){a=11;}
      else if(a=="c"){a=12;}
      else if(a=="d"){a=13;}
      else if(a=="e"){a=14;}
      else if(a=="f"){a=15;}
      s+=(a)*Math.pow(16,k);
    }
    output += String.fromCharCode(s);
    posFrom = posTo + 4;
    posTo = strAscii.indexOf("\\x", posFrom);
  }
  output+=strAscii.substring(posFrom);
  return ascii2native(output);
}

// ascii 
function ascii2native(strAscii) {
  var output = "";
  var posFrom = 0;
  var posTo = strAscii.indexOf("\\u", posFrom);
  while (posTo >= 0) {
    output += strAscii.substring(posFrom, posTo);
    output += toChar(strAscii.substr(posTo, 6));
    posFrom = posTo + 6;
    posTo = strAscii.indexOf("\\u", posFrom);
  }
  output += strAscii.substr(posFrom);
  return output;
}

function toChar(str) {
  if (str.substr(0, 2) != "\\u") return str;
  var code = 0;
  for (var i=2; i<str.length; i++) {
    var cc = str.charCodeAt(i);
    if (cc >= 0x30 && cc <= 0x39)
      cc = cc - 0x30;
    else if (cc >= 0x41 && cc <= 0x5A)
      cc = cc - 0x41 + 10;
    else if (cc >= 0x61 && cc <= 0x7A)
      cc = cc - 0x61 + 10;
       code <<= 4;
       code += cc;
  }

  if (code < 0xff) return str;
  return String.fromCharCode(code);
}

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