77 lines
2.6 KiB
JavaScript
77 lines
2.6 KiB
JavaScript
/*
|
|
* 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 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;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Converts a base64 string to an ArrayBuffer.
|
|
* @param content The binary content string encoded in base64.
|
|
* @returns 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;
|
|
}
|
|
}
|