pollymc/api/logic/minecraft/launch/ExtractNatives.cpp

/* Copyright 2013-2018 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 "ExtractNatives.h"
#include <minecraft/MinecraftInstance.h>
#include <launch/LaunchTask.h>

#include <quazip.h>
#include <quazipdir.h>
#include "MMCZip.h"
#include "FileSystem.h"
#include <QDir>

static QString replaceSuffix (QString target, const QString &suffix, const QString &replacement)
{
	if (!target.endsWith(suffix))
	{
		return target;
	}
	target.resize(target.length() - suffix.length());
	return target + replacement;
}

static bool unzipNatives(QString source, QString targetFolder, bool applyJnilibHack)
{
	QuaZip zip(source);
	if(!zip.open(QuaZip::mdUnzip))
	{
		return false;
	}
	QDir directory(targetFolder);
	if (!zip.goToFirstFile())
	{
		return false;
	}
	do
	{
		QString name = zip.getCurrentFileName();
		if(applyJnilibHack)
		{
			name = replaceSuffix(name, ".jnilib", ".dylib");
		}
		QString absFilePath = directory.absoluteFilePath(name);
		if (!JlCompress::extractFile(&zip, "", absFilePath))
		{
			return false;
		}
	} while (zip.goToNextFile());
	zip.close();
	if(zip.getZipError()!=0)
	{
		return false;
	}
	return true;
}

void ExtractNatives::executeTask()
{
	auto instance = m_parent->instance();
	std::shared_ptr<MinecraftInstance> minecraftInstance = std::dynamic_pointer_cast<MinecraftInstance>(instance);
	auto toExtract = minecraftInstance->getNativeJars();
	if(toExtract.isEmpty())
	{
		emitSucceeded();
		return;
	}
	auto outputPath  = minecraftInstance->getNativePath();
	auto javaVersion = minecraftInstance->getJavaVersion();
	bool jniHackEnabled = javaVersion.major() >= 8;
	for(const auto &source: toExtract)
	{
		if(!unzipNatives(source, outputPath, jniHackEnabled))
		{
			auto reason = tr("Couldn't extract native jar '%1' to destination '%2'").arg(source, outputPath);
			emit logLine(reason, MessageLevel::Fatal);
			emitFailed(reason);
		}
	}
	emitSucceeded();
}

void ExtractNatives::finalize()
{
	auto instance = m_parent->instance();
	QString target_dir = FS::PathCombine(instance->instanceRoot(), "natives/");
	QDir dir(target_dir);
	dir.removeRecursively();
}