diff options
Diffstat (limited to 'meshmc/libraries/classparser/src/classparser.cpp')
| -rw-r--r-- | meshmc/libraries/classparser/src/classparser.cpp | 116 |
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 |