enc-utf16.js

;(function (root, factory) {
	if (typeof exports === "object") {
		// CommonJS
		module.exports = exports = factory(require("./core"));
	}
	else if (typeof define === "function" && define.amd) {
		// AMD
		define(["./core"], factory);
	}
	else {
		// Global (browser)
		factory(root.CryptoJS);
	}
}(this, function (CryptoJS) {

	(function () {
	    // Shortcuts
	    var C = CryptoJS;
	    var C_lib = C.lib;
	    var WordArray = C_lib.WordArray;
	    var C_enc = C.enc;

	    /**
	     * UTF-16 BE encoding strategy.
	     */
	    var Utf16BE = C_enc.Utf16 = C_enc.Utf16BE = {
	        /**
	         * Converts a word array to a UTF-16 BE string.
	         *
	         * @param {WordArray} wordArray The word array.
	         *
	         * @return {string} The UTF-16 BE string.
	         *
	         * @static
	         *
	         * @example
	         *
	         *     var utf16String = CryptoJS.enc.Utf16.stringify(wordArray);
	         */
	        stringify: function (wordArray) {
	            // Shortcuts
	            var words = wordArray.words;
	            var sigBytes = wordArray.sigBytes;

	            // Convert
	            var utf16Chars = [];
	            for (var i = 0; i < sigBytes; i += 2) {
	                var codePoint = (words[i >>> 2] >>> (16 - (i % 4) * 8)) & 0xffff;
	                utf16Chars.push(String.fromCharCode(codePoint));
	            }

	            return utf16Chars.join('');
	        },

	        /**
	         * Converts a UTF-16 BE string to a word array.
	         *
	         * @param {string} utf16Str The UTF-16 BE string.
	         *
	         * @return {WordArray} The word array.
	         *
	         * @static
	         *
	         * @example
	         *
	         *     var wordArray = CryptoJS.enc.Utf16.parse(utf16String);
	         */
	        parse: function (utf16Str) {
	            // Shortcut
	            var utf16StrLength = utf16Str.length;

	            // Convert
	            var words = [];
	            for (var i = 0; i < utf16StrLength; i++) {
	                words[i >>> 1] |= utf16Str.charCodeAt(i) << (16 - (i % 2) * 16);
	            }

	            return WordArray.create(words, utf16StrLength * 2);
	        }
	    };

	    /**
	     * UTF-16 LE encoding strategy.
	     */
	    C_enc.Utf16LE = {
	        /**
	         * Converts a word array to a UTF-16 LE string.
	         *
	         * @param {WordArray} wordArray The word array.
	         *
	         * @return {string} The UTF-16 LE string.
	         *
	         * @static
	         *
	         * @example
	         *
	         *     var utf16Str = CryptoJS.enc.Utf16LE.stringify(wordArray);
	         */
	        stringify: function (wordArray) {
	            // Shortcuts
	            var words = wordArray.words;
	            var sigBytes = wordArray.sigBytes;

	            // Convert
	            var utf16Chars = [];
	            for (var i = 0; i < sigBytes; i += 2) {
	                var codePoint = swapEndian((words[i >>> 2] >>> (16 - (i % 4) * 8)) & 0xffff);
	                utf16Chars.push(String.fromCharCode(codePoint));
	            }

	            return utf16Chars.join('');
	        },

	        /**
	         * Converts a UTF-16 LE string to a word array.
	         *
	         * @param {string} utf16Str The UTF-16 LE string.
	         *
	         * @return {WordArray} The word array.
	         *
	         * @static
	         *
	         * @example
	         *
	         *     var wordArray = CryptoJS.enc.Utf16LE.parse(utf16Str);
	         */
	        parse: function (utf16Str) {
	            // Shortcut
	            var utf16StrLength = utf16Str.length;

	            // Convert
	            var words = [];
	            for (var i = 0; i < utf16StrLength; i++) {
	                words[i >>> 1] |= swapEndian(utf16Str.charCodeAt(i) << (16 - (i % 2) * 16));
	            }

	            return WordArray.create(words, utf16StrLength * 2);
	        }
	    };

	    function swapEndian(word) {
	        return ((word << 8) & 0xff00ff00) | ((word >>> 8) & 0x00ff00ff);
	    }
	}());


	return CryptoJS.enc.Utf16;

}));