95 lines
3.4 KiB
Java
95 lines
3.4 KiB
Java
// SPDX-License-Identifier: GPL-3.0-only
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/*
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* Prism Launcher - Minecraft Launcher
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* Copyright (C) 2022 TheKodeToad <TheKodeToad@proton.me>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Linking this library statically or dynamically with other modules is
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* making a combined work based on this library. Thus, the terms and
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* conditions of the GNU General Public License cover the whole
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* combination.
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*
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* As a special exception, the copyright holders of this library give
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* you permission to link this library with independent modules to
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* produce an executable, regardless of the license terms of these
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* independent modules, and to copy and distribute the resulting
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* executable under terms of your choice, provided that you also meet,
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* for each linked independent module, the terms and conditions of the
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* license of that module. An independent module is a module which is
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* not derived from or based on this library. If you modify this
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* library, you may extend this exception to your version of the
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* library, but you are not obliged to do so. If you do not wish to do
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* so, delete this exception statement from your version.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package org.prismlauncher.utils;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodType;
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import java.nio.charset.StandardCharsets;
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import org.prismlauncher.utils.logging.Log;
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/**
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* Uses Base64 with Java 8 or later, otherwise DatatypeConverter. In the latter
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* case, reflection is used to allow using newer compilers.
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*/
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public final class Base64 {
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private static boolean supported = true;
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private static MethodHandle legacy;
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static {
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try {
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Class.forName("java.util.Base64");
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} catch (ClassNotFoundException e) {
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try {
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Class<?> datatypeConverter = Class.forName("javax.xml.bind.DatatypeConverter");
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legacy = MethodHandles.lookup().findStatic(datatypeConverter, "parseBase64Binary",
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MethodType.methodType(byte[].class, String.class));
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} catch (ClassNotFoundException | NoSuchMethodException | IllegalAccessException e1) {
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Log.error("Base64 not supported", e1);
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supported = false;
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}
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}
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}
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/**
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* Determines whether base64 is supported.
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*
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* @return <code>true</code> if base64 can be parsed
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*/
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public static boolean isSupported() {
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return supported;
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}
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public static byte[] decode(String input) {
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if (!isSupported())
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throw new UnsupportedOperationException();
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if (legacy == null)
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return java.util.Base64.getDecoder().decode(input.getBytes(StandardCharsets.UTF_8));
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try {
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return (byte[]) legacy.invokeExact(input);
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} catch (Error | RuntimeException e) {
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throw e;
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} catch (Throwable e) {
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throw new Error(e);
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}
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}
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}
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