123 lines
2.7 KiB
JavaScript
123 lines
2.7 KiB
JavaScript
import {
|
|
WordArray,
|
|
} from './core.js';
|
|
|
|
const swapEndian = word => ((word << 8) & 0xff00ff00) | ((word >>> 8) & 0x00ff00ff);
|
|
|
|
/**
|
|
* UTF-16 BE encoding strategy.
|
|
*/
|
|
export const 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
|
|
*
|
|
* const utf16String = CryptoJS.enc.Utf16.stringify(wordArray);
|
|
*/
|
|
stringify(wordArray) {
|
|
// Shortcuts
|
|
const { words, sigBytes } = wordArray;
|
|
|
|
// Convert
|
|
const utf16Chars = [];
|
|
for (let i = 0; i < sigBytes; i += 2) {
|
|
const 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
|
|
*
|
|
* const wordArray = CryptoJS.enc.Utf16.parse(utf16String);
|
|
*/
|
|
parse(utf16Str) {
|
|
// Shortcut
|
|
const utf16StrLength = utf16Str.length;
|
|
|
|
// Convert
|
|
const words = [];
|
|
for (let i = 0; i < utf16StrLength; i += 1) {
|
|
words[i >>> 1] |= utf16Str.charCodeAt(i) << (16 - (i % 2) * 16);
|
|
}
|
|
|
|
return WordArray.create(words, utf16StrLength * 2);
|
|
},
|
|
};
|
|
export const Utf16 = Utf16BE;
|
|
|
|
/**
|
|
* UTF-16 LE encoding strategy.
|
|
*/
|
|
export const 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
|
|
*
|
|
* const utf16Str = CryptoJS.enc.Utf16LE.stringify(wordArray);
|
|
*/
|
|
stringify(wordArray) {
|
|
// Shortcuts
|
|
const { words, sigBytes } = wordArray;
|
|
|
|
// Convert
|
|
const utf16Chars = [];
|
|
for (let i = 0; i < sigBytes; i += 2) {
|
|
const 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
|
|
*
|
|
* const wordArray = CryptoJS.enc.Utf16LE.parse(utf16Str);
|
|
*/
|
|
parse(utf16Str) {
|
|
// Shortcut
|
|
const utf16StrLength = utf16Str.length;
|
|
|
|
// Convert
|
|
const words = [];
|
|
for (let i = 0; i < utf16StrLength; i += 1) {
|
|
words[i >>> 1] |= swapEndian(utf16Str.charCodeAt(i) << (16 - (i % 2) * 16));
|
|
}
|
|
|
|
return WordArray.create(words, utf16StrLength * 2);
|
|
},
|
|
};
|