Add 'meshmc/' from commit 'fad6a1066616b69d7f5fef01178efdf014c59537'

git-subtree-dir: meshmc
git-subtree-mainline: 934382c8a1ce738589dee9ee0f14e1cec812770e
git-subtree-split: fad6a1066616b69d7f5fef01178efdf014c59537

1 files changed, 189 insertions, 0 deletions

diff --git a/meshmc/launcher/java/JavaChecker.cpp b/meshmc/launcher/java/JavaChecker.cpp
new file mode 100644
index 0000000000..25978db8c2
--- /dev/null
+++ b/meshmc/launcher/java/JavaChecker.cpp
@@ -0,0 +1,189 @@
+/* SPDX-FileCopyrightText: 2026 Project Tick
+ * SPDX-FileContributor: Project Tick
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   MeshMC - A Custom Launcher for Minecraft
+ *   Copyright (C) 2026 Project Tick
+ *
+ *   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/>.
+ */
+
+#include "JavaChecker.h"
+
+#include <QFile>
+#include <QProcess>
+#include <QMap>
+#include <QDebug>
+
+#include "JavaUtils.h"
+#include "FileSystem.h"
+#include "Commandline.h"
+#include "Application.h"
+
+JavaChecker::JavaChecker(QObject* parent) : QObject(parent) {}
+
+void JavaChecker::performCheck()
+{
+	QString checkerJar =
+		FS::PathCombine(APPLICATION->getJarsPath(), "JavaCheck.jar");
+
+	QStringList args;
+
+	process.reset(new QProcess());
+	if (m_args.size()) {
+		auto extraArgs = Commandline::splitArgs(m_args);
+		args.append(extraArgs);
+	}
+	if (m_minMem != 0) {
+		args << QString("-Xms%1m").arg(m_minMem);
+	}
+	if (m_maxMem != 0) {
+		args << QString("-Xmx%1m").arg(m_maxMem);
+	}
+	if (m_permGen != 64) {
+		args << QString("-XX:PermSize=%1m").arg(m_permGen);
+	}
+
+	args.append({"-jar", checkerJar});
+	process->setArguments(args);
+	process->setProgram(m_path);
+	process->setProcessChannelMode(QProcess::SeparateChannels);
+	process->setProcessEnvironment(CleanEnviroment());
+	qDebug() << "Running java checker: " + m_path + args.join(" ");
+	;
+
+	connect(process.get(), SIGNAL(finished(int, QProcess::ExitStatus)), this,
+			SLOT(finished(int, QProcess::ExitStatus)));
+	connect(process.get(), SIGNAL(errorOccurred(QProcess::ProcessError)), this,
+			SLOT(error(QProcess::ProcessError)));
+	connect(process.get(), SIGNAL(readyReadStandardOutput()), this,
+			SLOT(stdoutReady()));
+	connect(process.get(), SIGNAL(readyReadStandardError()), this,
+			SLOT(stderrReady()));
+	connect(&killTimer, SIGNAL(timeout()), SLOT(timeout()));
+	killTimer.setSingleShot(true);
+	killTimer.start(15000);
+	process->start();
+}
+
+void JavaChecker::stdoutReady()
+{
+	QByteArray data = process->readAllStandardOutput();
+	QString added = QString::fromLocal8Bit(data);
+	added.remove('\r');
+	m_stdout += added;
+}
+
+void JavaChecker::stderrReady()
+{
+	QByteArray data = process->readAllStandardError();
+	QString added = QString::fromLocal8Bit(data);
+	added.remove('\r');
+	m_stderr += added;
+}
+
+void JavaChecker::finished(int exitcode, QProcess::ExitStatus status)
+{
+	killTimer.stop();
+	QProcessPtr _process = process;
+	process.reset();
+
+	JavaCheckResult result;
+	{
+		result.path = m_path;
+		result.id = m_id;
+	}
+	result.errorLog = m_stderr;
+	result.outLog = m_stdout;
+	qDebug() << "STDOUT" << m_stdout;
+	qWarning() << "STDERR" << m_stderr;
+	qDebug() << "Java checker finished with status " << status << " exit code "
+			 << exitcode;
+
+	if (status == QProcess::CrashExit || exitcode == 1) {
+		result.validity = JavaCheckResult::Validity::Errored;
+		emit checkFinished(result);
+		return;
+	}
+
+	bool success = true;
+
+	QMap<QString, QString> results;
+	QStringList lines = m_stdout.split("\n", Qt::SkipEmptyParts);
+	for (QString line : lines) {
+		line = line.trimmed();
+		// NOTE: workaround for GH-4125, where garbage is getting printed into
+		// stdout on bedrock linux
+		if (line.contains("/bedrock/strata")) {
+			continue;
+		}
+
+		auto parts = line.split('=', Qt::SkipEmptyParts);
+		if (parts.size() != 2 || parts[0].isEmpty() || parts[1].isEmpty()) {
+			continue;
+		} else {
+			results.insert(parts[0], parts[1]);
+		}
+	}
+
+	if (!results.contains("os.arch") || !results.contains("java.version") ||
+		!results.contains("java.vendor") || !success) {
+		result.validity = JavaCheckResult::Validity::ReturnedInvalidData;
+		emit checkFinished(result);
+		return;
+	}
+
+	auto os_arch = results["os.arch"];
+	auto java_version = results["java.version"];
+	auto java_vendor = results["java.vendor"];
+	bool is_64 = os_arch == "x86_64" || os_arch == "amd64";
+
+	result.validity = JavaCheckResult::Validity::Valid;
+	result.is_64bit = is_64;
+	result.mojangPlatform = is_64 ? "64" : "32";
+	result.realPlatform = os_arch;
+	result.javaVersion = java_version;
+	result.javaVendor = java_vendor;
+	qDebug() << "Java checker succeeded.";
+	emit checkFinished(result);
+}
+
+void JavaChecker::error(QProcess::ProcessError err)
+{
+	if (err == QProcess::FailedToStart) {
+		qDebug() << "Java checker has failed to start.";
+		qDebug() << "Process environment:";
+		qDebug() << process->environment();
+		qDebug() << "Native environment:";
+		qDebug() << QProcessEnvironment::systemEnvironment().toStringList();
+		killTimer.stop();
+		JavaCheckResult result;
+		{
+			result.path = m_path;
+			result.id = m_id;
+		}
+
+		emit checkFinished(result);
+		return;
+	}
+}
+
+void JavaChecker::timeout()
+{
+	// NO MERCY. NO ABUSE.
+	if (process) {
+		qDebug() << "Java checker has been killed by timeout.";
+		process->kill();
+	}
+}