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+/*
+ * Copyright (C) 2021 Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ * Class containing generic string utility functions.
+ */
+class StringUtil {
+ /**
+ * Decodes the contents of an ArrayBuffer using UTF8.
+ * @param arrayBuffer The input ArrayBuffer.
+ * @returns A UTF8-decoded string.
+ */
+ static arrayBufferUtf8Decode(arrayBuffer) {
+ try {
+ return new TextDecoder('utf-8').decode(arrayBuffer);
+ } catch (e) {
+ return decodeURIComponent(escape(this.arrayBufferToBinaryString(arrayBuffer)));
+ }
+ }
+
+ /**
+ * Converts the contents of an ArrayBuffer to a base64 string.
+ * @param arrayBuffer The input ArrayBuffer.
+ * @returns A base64 string representing the binary content.
+ */
+ static arrayBufferToBase64(arrayBuffer) {
+ return btoa(this.arrayBufferToBinaryString(arrayBuffer));
+ }
+
+ /**
+ * Converts the contents of an ArrayBuffer to a binary string.
+ * @param arrayBuffer The input ArrayBuffer.
+ * @returns A string representing the binary content.
+ */
+ static arrayBufferToBinaryString(arrayBuffer) {
+ const bytes = new Uint8Array(arrayBuffer);
+ try {
+ return String.fromCharCode(...bytes);
+ } catch (e) {
+ let binary = '';
+ for (let i = 0, ii = bytes.byteLength; i < ii; ++i) {
+ binary += String.fromCharCode(bytes[i]);
+ }
+ return binary;
+ }
+ }
+}