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Convert between gb2312 and utf8 using javascript
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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); |
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