64 lines
1.4 KiB
JavaScript
64 lines
1.4 KiB
JavaScript
// -------------------------------------------------
|
|
// ------------------ UTF8 Helpers -----------------
|
|
// -------------------------------------------------
|
|
|
|
"use strict";
|
|
|
|
var UTF8 = {};
|
|
|
|
/** @constructor */
|
|
function UTF8StreamToUnicode() {
|
|
|
|
this.stream = new Uint8Array(5);
|
|
this.ofs = 0;
|
|
|
|
this.Put = function(key) {
|
|
this.stream[this.ofs] = key;
|
|
this.ofs++;
|
|
switch(this.ofs) {
|
|
case 1:
|
|
if (this.stream[0] < 128) {
|
|
this.ofs = 0;
|
|
return this.stream[0];
|
|
}
|
|
break;
|
|
|
|
case 2:
|
|
if ((this.stream[0]&0xE0) == 0xC0)
|
|
if ((this.stream[1]&0xC0) == 0x80) {
|
|
this.ofs = 0;
|
|
return ((this.stream[0]&0x1F)<<6) | (this.stream[1]&0x3F);
|
|
}
|
|
break;
|
|
|
|
case 3:
|
|
break;
|
|
|
|
case 4:
|
|
break;
|
|
|
|
default:
|
|
return -1;
|
|
//this.ofs = 0;
|
|
//break;
|
|
}
|
|
return -1;
|
|
};
|
|
}
|
|
|
|
function UnicodeToUTF8Stream(key)
|
|
{
|
|
if (key < 0x80) return [key];
|
|
if (key < 0x800) return [0xC0|((key>>6)&0x1F), 0x80|(key&0x3F)];
|
|
}
|
|
|
|
UTF8.UTF8Length = function(s)
|
|
{
|
|
var length = 0;
|
|
for(var i=0; i<s.length; i++) {
|
|
var c = s.charCodeAt(i);
|
|
length += c<128?1:2;
|
|
}
|
|
return length;
|
|
};
|