1 files changed, 158 insertions, 0 deletions
diff --git a/logic/minecraft/JarUtils.cpp b/logic/minecraft/JarUtils.cpp
new file mode 100644
index 00000000..59326aba
--- /dev/null
+++ b/logic/minecraft/JarUtils.cpp
@@ -0,0 +1,158 @@
+#include "logic/minecraft/JarUtils.h"
+#include <quazip.h>
+#include <quazipfile.h>
+#include <JlCompress.h>
+#include <QDebug>
+
+namespace JarUtils {
+
+bool mergeZipFiles(QuaZip *into, QFileInfo from, QSet<QString> &contained,
+				   std::function<bool(QString)> filter)
+{
+	QuaZip modZip(from.filePath());
+	modZip.open(QuaZip::mdUnzip);
+
+	QuaZipFile fileInsideMod(&modZip);
+	QuaZipFile zipOutFile(into);
+	for (bool more = modZip.goToFirstFile(); more; more = modZip.goToNextFile())
+	{
+		QString filename = modZip.getCurrentFileName();
+		if (!filter(filename))
+		{
+			qDebug() << "Skipping file " << filename << " from "
+						<< from.fileName() << " - filtered";
+			continue;
+		}
+		if (contained.contains(filename))
+		{
+			qDebug() << "Skipping already contained file " << filename << " from "
+						<< from.fileName();
+			continue;
+		}
+		contained.insert(filename);
+
+		if (!fileInsideMod.open(QIODevice::ReadOnly))
+		{
+			qCritical() << "Failed to open " << filename << " from " << from.fileName();
+			return false;
+		}
+
+		QuaZipNewInfo info_out(fileInsideMod.getActualFileName());
+
+		if (!zipOutFile.open(QIODevice::WriteOnly, info_out))
+		{
+			qCritical() << "Failed to open " << filename << " in the jar";
+			fileInsideMod.close();
+			return false;
+		}
+		if (!JlCompress::copyData(fileInsideMod, zipOutFile))
+		{
+			zipOutFile.close();
+			fileInsideMod.close();
+			qCritical() << "Failed to copy data of " << filename << " into the jar";
+			return false;
+		}
+		zipOutFile.close();
+		fileInsideMod.close();
+	}
+	return true;
+}
+
+bool createModdedJar(QString sourceJarPath, QString targetJarPath, const QList<Mod>& mods)
+{
+	QuaZip zipOut(targetJarPath);
+	if (!zipOut.open(QuaZip::mdCreate))
+	{
+		QFile::remove(targetJarPath);
+		qCritical() << "Failed to open the minecraft.jar for modding";
+		return false;
+	}
+	// Files already added to the jar.
+	// These files will be skipped.
+	QSet<QString> addedFiles;
+
+	// Modify the jar
+	QListIterator<Mod> i(mods);
+    i.toBack();
+    while (i.hasPrevious())
+	{
+		const Mod &mod = i.previous();
+		// do not merge disabled mods.
+		if (!mod.enabled())
+			continue;
+		if (mod.type() == Mod::MOD_ZIPFILE)
+		{
+			if (!mergeZipFiles(&zipOut, mod.filename(), addedFiles, noFilter))
+			{
+				zipOut.close();
+				QFile::remove(targetJarPath);
+				qCritical() << "Failed to add" << mod.filename().fileName() << "to the jar.";
+				return false;
+			}
+		}
+		else if (mod.type() == Mod::MOD_SINGLEFILE)
+		{
+			auto filename = mod.filename();
+			if (!JlCompress::compressFile(&zipOut, filename.absoluteFilePath(),
+										  filename.fileName()))
+			{
+				zipOut.close();
+				QFile::remove(targetJarPath);
+				qCritical() << "Failed to add" << mod.filename().fileName() << "to the jar.";
+				return false;
+			}
+			addedFiles.insert(filename.fileName());
+		}
+		else if (mod.type() == Mod::MOD_FOLDER)
+		{
+			auto filename = mod.filename();
+			QString what_to_zip = filename.absoluteFilePath();
+			QDir dir(what_to_zip);
+			dir.cdUp();
+			QString parent_dir = dir.absolutePath();
+			if (!JlCompress::compressSubDir(&zipOut, what_to_zip, parent_dir, true, addedFiles))
+			{
+				zipOut.close();
+				QFile::remove(targetJarPath);
+				qCritical() << "Failed to add" << mod.filename().fileName() << "to the jar.";
+				return false;
+			}
+			qDebug() << "Adding folder " << filename.fileName() << " from "
+						<< filename.absoluteFilePath();
+		}
+	}
+
+	if (!mergeZipFiles(&zipOut, QFileInfo(sourceJarPath), addedFiles, metaInfFilter))
+	{
+		zipOut.close();
+		QFile::remove(targetJarPath);
+		qCritical() << "Failed to insert minecraft.jar contents.";
+		return false;
+	}
+
+	// Recompress the jar
+	zipOut.close();
+	if (zipOut.getZipError() != 0)
+	{
+		QFile::remove(targetJarPath);
+		qCritical() << "Failed to finalize minecraft.jar!";
+		return false;
+	}
+	return true;
+}
+
+bool noFilter(QString)
+{
+	return true;
+}
+
+bool metaInfFilter(QString key)
+{
+	if(key.contains("META-INF"))
+	{
+		return false;
+	}
+	return true;
+}
+
+}