import {
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WordArray,
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} from './core.js';
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const swapEndian = word => ((word << 8) & 0xff00ff00) | ((word >>> 8) & 0x00ff00ff);
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/**
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* UTF-16 BE encoding strategy.
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*/
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export const Utf16BE = {
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/**
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* Converts a word array to a UTF-16 BE string.
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*
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* @param {WordArray} wordArray The word array.
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*
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* @return {string} The UTF-16 BE string.
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*
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* @static
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*
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* @example
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*
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* const utf16String = CryptoJS.enc.Utf16.stringify(wordArray);
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*/
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stringify(wordArray) {
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// Shortcuts
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const { words, sigBytes } = wordArray;
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// Convert
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const utf16Chars = [];
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for (let i = 0; i < sigBytes; i += 2) {
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const codePoint = (words[i >>> 2] >>> (16 - (i % 4) * 8)) & 0xffff;
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utf16Chars.push(String.fromCharCode(codePoint));
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}
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return utf16Chars.join('');
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},
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/**
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* Converts a UTF-16 BE string to a word array.
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*
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* @param {string} utf16Str The UTF-16 BE string.
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*
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* @return {WordArray} The word array.
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*
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* @static
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*
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* @example
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*
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* const wordArray = CryptoJS.enc.Utf16.parse(utf16String);
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*/
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parse(utf16Str) {
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// Shortcut
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const utf16StrLength = utf16Str.length;
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// Convert
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const words = [];
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for (let i = 0; i < utf16StrLength; i += 1) {
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words[i >>> 1] |= utf16Str.charCodeAt(i) << (16 - (i % 2) * 16);
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}
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return WordArray.create(words, utf16StrLength * 2);
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},
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};
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export const Utf16 = Utf16BE;
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/**
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* UTF-16 LE encoding strategy.
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*/
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export const Utf16LE = {
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/**
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* Converts a word array to a UTF-16 LE string.
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*
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* @param {WordArray} wordArray The word array.
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*
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* @return {string} The UTF-16 LE string.
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*
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* @static
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*
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* @example
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*
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* const utf16Str = CryptoJS.enc.Utf16LE.stringify(wordArray);
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*/
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stringify(wordArray) {
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// Shortcuts
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const { words, sigBytes } = wordArray;
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// Convert
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const utf16Chars = [];
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for (let i = 0; i < sigBytes; i += 2) {
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const codePoint = swapEndian((words[i >>> 2] >>> (16 - (i % 4) * 8)) & 0xffff);
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utf16Chars.push(String.fromCharCode(codePoint));
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}
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return utf16Chars.join('');
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},
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/**
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* Converts a UTF-16 LE string to a word array.
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*
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* @param {string} utf16Str The UTF-16 LE string.
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*
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* @return {WordArray} The word array.
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*
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* @static
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*
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* @example
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*
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* const wordArray = CryptoJS.enc.Utf16LE.parse(utf16Str);
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*/
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parse(utf16Str) {
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// Shortcut
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const utf16StrLength = utf16Str.length;
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// Convert
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const words = [];
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for (let i = 0; i < utf16StrLength; i += 1) {
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words[i >>> 1] |= swapEndian(utf16Str.charCodeAt(i) << (16 - (i % 2) * 16));
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}
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return WordArray.create(words, utf16StrLength * 2);
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},
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};
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