utf16.js

   1 if (typeof define !== 'function') { var define = require('amdefine')(module) }
   2
   3 define(function(require) {
   4
   5 var decode = function(array, string) {
   6     for (var i = 0, e = string.length; i != e; ++i) {
   7         var unit = string.charCodeAt(i);
   8         var part = unit & 0xfc00;
   9         if (part == 0xdc00)
  10             return null;
  11         else if (part != 0xd800)
  12             array.push(unit);
  13         else if (++i == e)
  14             return null;
  15         else {
  16             var next = string.charCodeAt(i);
  17             if ((next & 0xfc00) != 0xdc00)
  18                 return null;
  19             array.push(0x10000 | (unit & 0x03ff) << 10 | next & 0x03ff);
  20         }
  21     }
  22
  23     return array;
  24 };
  25
  26 var encode = function(array) {
  27     var units = [];
  28     for (var i = 0, e = array.length; i != e; ++i) {
  29         var point = array[i];
  30         if (point < 0x10000)
  31             units.push(point);
  32         else {
  33             point -= 0x10000;
  34             units.push(0xd800 | (0xffc00 & point) >> 10, 0xdc00 | 0x03ff & point);
  35         }
  36     } return String.fromCharCode.apply(String, units);
  37 };
  38
  39 return {
  40     decode: decode,
  41     encode: encode,
  42 };
  43
  44 });