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GB2312UTF8

utf-8 and gb2312 converter

此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.gf.qytechs.cn/scripts/450973/1091107/GB2312UTF8.js 

  1. // ==UserScript==
  2. // @name         GB2312UTF8
  3. // @namespace    ucdrs.superlib.net
  4. // @version      1.0
  5. // @description  utf-8 and gb2312 converter
  6. // @license      copyright http://freecode-freecode.blogspot.com/2008/11/how-to-gbkgb2312-and-utf-8-encoding.html, mod by https://gist.github.com/19317362/a1d8e40bfb6587463d4d
  7. // ==/UserScript==
  8.  
  9. GB2312UTF8  = {
  10.   Dig2Dec : function(s){
  11.       var retV = 0;
  12.       if(s.length == 4){
  13.           for(var i = 0; i < 4; i ++){
  14.               retV += eval(s.charAt(i)) * Math.pow(2, 3 - i);
  15.           }
  16.           return retV;
  17.       }
  18.       return -1;
  19.   } ,
  20.  
  21.   Hex2Utf8 : function(s){
  22.      var retS = "";
  23.      var tempS = "";
  24.      var ss = "";
  25.      if(s.length == 16){
  26.          tempS = "1110" + s.substring(0, 4);
  27.          tempS += "10" +  s.substring(4, 10);
  28.          tempS += "10" + s.substring(10,16);
  29.          var sss = "0123456789ABCDEF";
  30.          for(var i = 0; i < 3; i ++){
  31.             retS += "%";
  32.             ss = tempS.substring(i * 8, (eval(i)+1)*8);
  33.             retS += sss.charAt(this.Dig2Dec(ss.substring(0,4)));
  34.             retS += sss.charAt(this.Dig2Dec(ss.substring(4,8)));
  35.          }
  36.          return retS;
  37.      }
  38.      return "";
  39.   } ,
  40.  
  41.   Dec2Dig : function(n1){
  42.       var s = "";
  43.       var n2 = 0;
  44.       for(var i = 0; i < 4; i++){
  45.          n2 = Math.pow(2,3 - i);
  46.          if(n1 >= n2){
  47.             s += '1';
  48.             n1 = n1 - n2;
  49.           }
  50.          else
  51.           s += '0';
  52.       }
  53.       return s;
  54.   },
  55.  
  56.   Str2Hex : function(s){
  57.       var c = "";
  58.       var n;
  59.       var ss = "0123456789ABCDEF";
  60.       var digS = "";
  61.       for(var i = 0; i < s.length; i ++){
  62.          c = s.charAt(i);
  63.          n = ss.indexOf(c);
  64.          digS += this.Dec2Dig(eval(n));
  65.       }
  66.       return digS;
  67.   },
  68.  
  69.   GB2312ToUTF8 : function(s1){
  70.     var s = escape(s1);
  71.     var sa = s.split("%");
  72.     var retV ="";
  73.     if(sa[0] != ""){
  74.       retV = sa[0];
  75.     }
  76.     for(var i = 1; i < sa.length; i ++){
  77.       if(sa[i].substring(0,1) == "u"){
  78.         //alert(this.Str2Hex(sa[i].substring(1,5)));
  79.         retV += this.Hex2Utf8(this.Str2Hex(sa[i].substring(1,5)));
  80.   if(sa[i].length){
  81.     retV += sa[i].substring(5);
  82.   }
  83.       }
  84.       else{
  85.      retV += unescape("%" + sa[i]);
  86.   if(sa[i].length){
  87.     retV += sa[i].substring(5);
  88.   }
  89.    }
  90.     }
  91.     return retV;
  92.   },
  93.  
  94.   UTF8ToGB2312 : function(str1){
  95.         var substr = "";
  96.         var a = "";
  97.         var b = "";
  98.         var c = "";
  99.         var i = -1;
  100.         i = str1.indexOf("%");
  101.         if(i==-1){
  102.           return str1;
  103.         }
  104.         while(i!= -1){
  105.     if(i<3){
  106.                 substr = substr + str1.substr(0,i-1);
  107.                 str1 = str1.substr(i+1,str1.length-i);
  108.                 a = str1.substr(0,2);
  109.                 str1 = str1.substr(2,str1.length - 2);
  110.                 if(parseInt("0x" + a) & 0x80 == 0){
  111.                   substr = substr + String.fromCharCode(parseInt("0x" + a));
  112.                 }
  113.                 else if(parseInt("0x" + a) & 0xE0 == 0xC0){ //two byte
  114.                         b = str1.substr(1,2);
  115.                         str1 = str1.substr(3,str1.length - 3);
  116.                         var widechar = (parseInt("0x" + a) & 0x1F) << 6;
  117.                         widechar = widechar | (parseInt("0x" + b) & 0x3F);
  118.                         substr = substr + String.fromCharCode(widechar);
  119.                 }
  120.                 else{
  121.                         b = str1.substr(1,2);
  122.                         str1 = str1.substr(3,str1.length - 3);
  123.                         c = str1.substr(1,2);
  124.                         str1 = str1.substr(3,str1.length - 3);
  125.                         var widechar = (parseInt("0x" + a) & 0x0F) << 12;
  126.                         widechar = widechar | ((parseInt("0x" + b) & 0x3F) << 6);
  127.                         widechar = widechar | (parseInt("0x" + c) & 0x3F);
  128.                         substr = substr + String.fromCharCode(widechar);
  129.                 }
  130.      }
  131.      else {
  132.       substr = substr + str1.substring(0,i);
  133.       str1= str1.substring(i);
  134.      }
  135.               i = str1.indexOf("%");
  136.         }
  137.  
  138.         return substr+str1;
  139.   }
  140. };

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