Add 'meshmc/' from commit 'fad6a1066616b69d7f5fef01178efdf014c59537'

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

1 files changed, 116 insertions, 0 deletions

diff --git a/meshmc/libraries/classparser/src/classparser.cpp b/meshmc/libraries/classparser/src/classparser.cpp
new file mode 100644
index 0000000000..2dd4bdfba2
--- /dev/null
+++ b/meshmc/libraries/classparser/src/classparser.cpp
@@ -0,0 +1,116 @@
+/* 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/>.
+ *
+ *  This file incorporates work covered by the following copyright and
+ *  permission notice:
+ *
+ * Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "classfile.h"
+#include "classparser.h"
+
+#include <QFile>
+#include <archive.h>
+#include <archive_entry.h>
+#include <QDebug>
+
+namespace classparser
+{
+
+	QString GetMinecraftJarVersion(QString jarName)
+	{
+		QString version;
+
+		// check if minecraft.jar exists
+		QFile jar(jarName);
+		if (!jar.exists())
+			return version;
+
+		// open jar with libarchive
+		struct archive* a = archive_read_new();
+		archive_read_support_format_zip(a);
+		if (archive_read_open_filename(a, jarName.toUtf8().constData(),
+									   10240) != ARCHIVE_OK) {
+			archive_read_free(a);
+			return version;
+		}
+
+		// find and read Minecraft.class
+		QByteArray classData;
+		struct archive_entry* entry;
+		while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+			QString name = QString::fromUtf8(archive_entry_pathname(entry));
+			if (name == "net/minecraft/client/Minecraft.class") {
+				la_int64_t sz = archive_entry_size(entry);
+				if (sz > 0) {
+					classData.resize(sz);
+					archive_read_data(a, classData.data(), sz);
+				} else {
+					char buf[8192];
+					la_ssize_t r;
+					while ((r = archive_read_data(a, buf, sizeof(buf))) > 0)
+						classData.append(buf, r);
+				}
+				break;
+			}
+			archive_read_data_skip(a);
+		}
+		archive_read_free(a);
+
+		if (classData.isEmpty())
+			return version;
+
+		// parse Minecraft.class
+		try {
+			char* temp = classData.data();
+			qint64 size = classData.size();
+			java::classfile MinecraftClass(temp, size);
+			java::constant_pool constants = MinecraftClass.constants;
+			for (java::constant_pool::container_type::const_iterator iter =
+					 constants.begin();
+				 iter != constants.end(); iter++) {
+				const java::constant& constant = *iter;
+				if (constant.type != java::constant_type_t::j_string_data)
+					continue;
+				const std::string& str = constant.str_data;
+				qDebug() << QString::fromStdString(str);
+				if (str.compare(0, 20, "Minecraft Minecraft ") == 0) {
+					version = str.substr(20).data();
+					break;
+				}
+			}
+		} catch (const java::classfile_exception&) {
+		}
+
+		return version;
+	}
+} // namespace classparser