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chenzhongchen27/gb2312-utf8-convert.js

Forked from fwolf/gb2312-utf8-convert.js
Created August 23, 2017 00:57
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Revisions

  1. @fwolf fwolf created this gist Feb 10, 2015.
    141 changes: 141 additions & 0 deletions gb2312-utf8-convert.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,141 @@
    http://freecode-freecode.blogspot.com/2008/11/how-to-gbkgb2312-and-utf-8-encoding.html

    GB2312UTF8 = {
    Dig2Dec : function(s){
    var retV = 0;
    if(s.length == 4){
    for(var i = 0; i < 4; i ++){
    retV += eval(s.charAt(i)) * Math.pow(2, 3 - i);
    }
    return retV;
    }
    return -1;
    } ,

    Hex2Utf8 : function(s){
    var retS = "";
    var tempS = "";
    var ss = "";
    if(s.length == 16){
    tempS = "1110" + s.substring(0, 4);
    tempS += "10" + s.substring(4, 10);
    tempS += "10" + s.substring(10,16);
    var sss = "0123456789ABCDEF";
    for(var i = 0; i < 3; i ++){
    retS += "%";
    ss = tempS.substring(i * 8, (eval(i)+1)*8);
    retS += sss.charAt(this.Dig2Dec(ss.substring(0,4)));
    retS += sss.charAt(this.Dig2Dec(ss.substring(4,8)));
    }
    return retS;
    }
    return "";
    } ,

    Dec2Dig : function(n1){
    var s = "";
    var n2 = 0;
    for(var i = 0; i < 4; i++){
    n2 = Math.pow(2,3 - i);
    if(n1 >= n2){
    s += '1';
    n1 = n1 - n2;
    }
    else
    s += '0';
    }
    return s;
    },

    Str2Hex : function(s){
    var c = "";
    var n;
    var ss = "0123456789ABCDEF";
    var digS = "";
    for(var i = 0; i < s.length; i ++){
    c = s.charAt(i);
    n = ss.indexOf(c);
    digS += this.Dec2Dig(eval(n));
    }
    return digS;
    },

    GB2312ToUTF8 : function(s1){
    var s = escape(s1);
    var sa = s.split("%");
    var retV ="";
    if(sa[0] != ""){
    retV = sa[0];
    }
    for(var i = 1; i < sa.length; i ++){
    if(sa[i].substring(0,1) == "u"){
    //alert(this.Str2Hex(sa[i].substring(1,5)));
    retV += this.Hex2Utf8(this.Str2Hex(sa[i].substring(1,5)));
    if(sa[i].length){
    retV += sa[i].substring(5);
    }
    }
    else{
    retV += unescape("%" + sa[i]);
    if(sa[i].length){
    retV += sa[i].substring(5);
    }
    }
    }
    return retV;
    },

    UTF8ToGB2312 : function(str1){
    var substr = "";
    var a = "";
    var b = "";
    var c = "";
    var i = -1;
    i = str1.indexOf("%");
    if(i==-1){
    return str1;
    }
    while(i!= -1){
    if(i<3){
    substr = substr + str1.substr(0,i-1);
    str1 = str1.substr(i+1,str1.length-i);
    a = str1.substr(0,2);
    str1 = str1.substr(2,str1.length - 2);
    if(parseInt("0x" + a) & 0x80 == 0){
    substr = substr + String.fromCharCode(parseInt("0x" + a));
    }
    else if(parseInt("0x" + a) & 0xE0 == 0xC0){ //two byte
    b = str1.substr(1,2);
    str1 = str1.substr(3,str1.length - 3);
    var widechar = (parseInt("0x" + a) & 0x1F) << 6;
    widechar = widechar | (parseInt("0x" + b) & 0x3F);
    substr = substr + String.fromCharCode(widechar);
    }
    else{
    b = str1.substr(1,2);
    str1 = str1.substr(3,str1.length - 3);
    c = str1.substr(1,2);
    str1 = str1.substr(3,str1.length - 3);
    var widechar = (parseInt("0x" + a) & 0x0F) << 12;
    widechar = widechar | ((parseInt("0x" + b) & 0x3F) << 6);
    widechar = widechar | (parseInt("0x" + c) & 0x3F);
    substr = substr + String.fromCharCode(widechar);
    }
    }
    else {
    substr = substr + str1.substring(0,i);
    str1= str1.substring(i);
    }
    i = str1.indexOf("%");
    }

    return substr+str1;
    }
    };

    test:
    GBK => UTF8:
    var utf8 = GB2312UTF8.GB2312ToUTF8("中文GB2312");

    UTF8 => GBK:
    GB2312UTF8.UTF8ToGB2312(utf8);