webpack/lib/util/StringXor.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

class StringXor {
	constructor() {
		this._value = undefined;
	}

	/**
	 * @param {string} str string
	 * @returns {void}
	 */
	add(str) {
		const len = str.length;
		const value = this._value;
		if (value === undefined) {
			const newValue = (this._value = Buffer.allocUnsafe(len));
			for (let i = 0; i < len; i++) {
				newValue[i] = str.charCodeAt(i);
			}
			return;
		}
		const valueLen = value.length;
		if (valueLen < len) {
			const newValue = (this._value = Buffer.allocUnsafe(len));
			let i;
			for (i = 0; i < valueLen; i++) {
				newValue[i] = value[i] ^ str.charCodeAt(i);
			}
			for (; i < len; i++) {
				newValue[i] = str.charCodeAt(i);
			}
		} else {
			for (let i = 0; i < len; i++) {
				value[i] = value[i] ^ str.charCodeAt(i);
			}
		}
	}

	toString() {
		const value = this._value;
		return value === undefined ? "" : value.toString("latin1");
	}

	updateHash(hash) {
		const value = this._value;
		if (value !== undefined) hash.update(value);
	}
}

module.exports = StringXor;