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node_modules/webpack/lib/util/StringXor.js

@@ -0,0 +1,55 @@
+/*
+	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;