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authortoasted-nutbread <toasted-nutbread@users.noreply.github.com>2022-08-20 12:53:22 -0400
committerGitHub <noreply@github.com>2022-08-20 12:53:22 -0400
commitd3807d88ecf40b2c37ed31d823af038a091ffca0 (patch)
treecc79293c901c3274beecce0e9f5e9f35efcb9ec8 /ext/js/data/sandbox/array-buffer-util.js
parentcd0a6b60e2f910e497a5b72bee1a27a0d1c575d2 (diff)
ArrayBufferUtil (#2215)
* Rename StringUtil to ArrayBufferUtil * Update docs * Rename file string-util.js to array-buffer-util.js
Diffstat (limited to 'ext/js/data/sandbox/array-buffer-util.js')
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1 files changed, 76 insertions, 0 deletions
diff --git a/ext/js/data/sandbox/array-buffer-util.js b/ext/js/data/sandbox/array-buffer-util.js
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+/*
+ * Copyright (C) 2021-2022 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 ArrayBuffer utility functions.
+ */
+class ArrayBufferUtil {
+ /**
+ * Decodes the contents of an ArrayBuffer using UTF8.
+ * @param {ArrayBuffer} arrayBuffer The input ArrayBuffer.
+ * @returns {string} 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} arrayBuffer The input ArrayBuffer.
+ * @returns {string} 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} arrayBuffer The input ArrayBuffer.
+ * @returns {string} 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;
+ }
+ }
+
+ /**
+ * Converts a base64 string to an ArrayBuffer.
+ * @param {string} content The binary content string encoded in base64.
+ * @returns {ArrayBuffer} A new `ArrayBuffer` object corresponding to the specified content.
+ */
+ static base64ToArrayBuffer(content) {
+ const binaryContent = atob(content);
+ const length = binaryContent.length;
+ const array = new Uint8Array(length);
+ for (let i = 0; i < length; ++i) {
+ array[i] = binaryContent.charCodeAt(i);
+ }
+ return array.buffer;
+ }
+}