57 lines
1.6 KiB
JavaScript
57 lines
1.6 KiB
JavaScript
import { WordArray } from "./core.mjs";
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//#region src/enc-utf16.ts
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/**
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* Swaps endian of a word
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* @param word - The word to swap
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* @returns The word with swapped endian
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*/
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const swapEndian = (word) => word << 8 & 4278255360 | word >>> 8 & 16711935;
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/**
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* UTF-16 BE encoding strategy.
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*/
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const Utf16BE = {
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stringify(wordArray) {
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const { words, sigBytes } = wordArray;
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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 & 65535;
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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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parse(utf16Str) {
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const utf16StrLength = utf16Str.length;
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const words = [];
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for (let i = 0; i < utf16StrLength; i += 1) words[i >>> 1] |= utf16Str.charCodeAt(i) << 16 - i % 2 * 16;
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return WordArray.create(words, utf16StrLength * 2);
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}
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};
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/**
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* UTF-16 encoding strategy (defaults to UTF-16 BE).
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*/
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const Utf16 = Utf16BE;
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/**
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* UTF-16 LE encoding strategy.
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*/
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const Utf16LE = {
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stringify(wordArray) {
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const { words, sigBytes } = wordArray;
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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 & 65535);
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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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parse(utf16Str) {
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const utf16StrLength = utf16Str.length;
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const words = [];
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for (let i = 0; i < utf16StrLength; i += 1) words[i >>> 1] |= swapEndian(utf16Str.charCodeAt(i) << 16 - i % 2 * 16);
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return WordArray.create(words, utf16StrLength * 2);
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}
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};
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//#endregion
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export { Utf16, Utf16BE, Utf16LE };
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//# sourceMappingURL=enc-utf16.mjs.map
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