util.js

// http://www.onicos.com/staff/iz/amuse/javascript/expert/utf.txt

/* utf.js - UTF-8 <=> UTF-16 convertion
 *
 * Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp>
 * Version: 1.0
 * LastModified: Dec 25 1999
 * This library is free.  You can redistribute it and/or modify it.
 */

Utf8ArrayToStr = function(array) {
  var out, i, len, c;
  var char2, char3;

  out = "";
  len = array.length;
  i = 0;
  while(i < len) {
    c = array[i++];
    switch(c >> 4)
    {
      case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
      // 0xxxxxxx
      out += String.fromCharCode(c);
      break;
      case 12: case 13:
      // 110x xxxx   10xx xxxx
      char2 = array[i++];
      out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
      break;
      case 14:
      // 1110 xxxx  10xx xxxx  10xx xxxx
      char2 = array[i++];
      char3 = array[i++];
      out += String.fromCharCode(((c & 0x0F) << 12) |
      ((char2 & 0x3F) << 6) |
      ((char3 & 0x3F) << 0));
      break;
    }
  }

  return out;
}