enc-utf16.js 2.0 KB

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  1. /*
  2. CryptoJS v3.0.2
  3. code.google.com/p/crypto-js
  4. (c) 2009-2012 by Jeff Mott. All rights reserved.
  5. code.google.com/p/crypto-js/wiki/License
  6. */
  7. (function () {
  8. // Shortcuts
  9. var C = CryptoJS;
  10. var C_lib = C.lib;
  11. var WordArray = C_lib.WordArray;
  12. var C_enc = C.enc;
  13. /**
  14. * UTF-16 BE encoding strategy.
  15. */
  16. var Utf16 = C_enc.Utf16 = {
  17. /**
  18. * Converts a word array to a UTF-16 string.
  19. *
  20. * @param {WordArray} wordArray The word array.
  21. *
  22. * @return {string} The UTF-16 string.
  23. *
  24. * @static
  25. *
  26. * @example
  27. *
  28. * var utf16String = CryptoJS.enc.Utf16.stringify(wordArray);
  29. */
  30. stringify: function (wordArray) {
  31. // Shortcuts
  32. var words = wordArray.words;
  33. var sigBytes = wordArray.sigBytes;
  34. // Convert
  35. var utf16Chars = [];
  36. for (var i = 0; i < sigBytes; i += 2) {
  37. var codePoint = (words[i >>> 2] >>> (16 - (i % 4) * 8)) & 0xffff;
  38. utf16Chars.push(String.fromCharCode(codePoint));
  39. }
  40. return utf16Chars.join('');
  41. },
  42. /**
  43. * Converts a UTF-16 string to a word array.
  44. *
  45. * @param {string} utf16Str The UTF-16 string.
  46. *
  47. * @return {WordArray} The word array.
  48. *
  49. * @static
  50. *
  51. * @example
  52. *
  53. * var wordArray = CryptoJS.enc.Utf16.parse(utf16String);
  54. */
  55. parse: function (utf16Str) {
  56. // Shortcut
  57. var utf16StrLength = utf16Str.length;
  58. // Convert
  59. var words = [];
  60. for (var i = 0; i < utf16StrLength; i++) {
  61. words[i >>> 1] |= utf16Str.charCodeAt(i) << (16 - (i % 2) * 16);
  62. }
  63. return WordArray.create(words, utf16StrLength * 2);
  64. }
  65. };
  66. }());