GH-1047 parse world files and integrate MCEdit with world page

logic/minecraft/World.cpp

@@ -15,9 +15,16 @@
 
 #include <QDir>
 #include <QString>
+#include <QDebug>
 #include "World.h"
 #include <pathutils.h>
 
+#include "GZip.h"
+#include <sstream>
+#include <io/stream_reader.h>
+#include <tag_string.h>
+#include <tag_primitive.h>
+
 World::World(const QFileInfo &file)
 {
 	repath(file);
@@ -26,8 +33,117 @@ World::World(const QFileInfo &file)
 void World::repath(const QFileInfo &file)
 {
 	m_file = file;
-	m_name = file.fileName();
-	is_valid = file.isDir() && QDir(file.filePath()).exists("level.dat");
+	m_folderName = file.fileName();
+	QDir worldDir(file.filePath());
+	is_valid = file.isDir() && worldDir.exists("level.dat");
+	if(!is_valid)
+	{
+		return;
+	}
+
+	auto fullFilePath = worldDir.absoluteFilePath("level.dat");
+	QFile f(fullFilePath);
+	is_valid = f.open(QIODevice::ReadOnly);
+	if(!is_valid)
+	{
+		return;
+	}
+
+	QByteArray output;
+	is_valid = GZip::inflate(f.readAll(), output);
+	if(!is_valid)
+	{
+		return;
+	}
+	f.close();
+
+	auto read_string = [](nbt::value& parent, const char * name, const QString & fallback = QString()) -> QString
+	{
+		try
+		{
+			auto &namedValue = parent.at(name);
+			if(namedValue.get_type() != nbt::tag_type::String)
+			{
+				return fallback;
+			}
+			auto & tag_str = namedValue.as<nbt::tag_string>();
+			return QString::fromStdString(tag_str.get());
+		}
+		catch(std::out_of_range e)
+		{
+			// fallback for old world formats
+			return fallback;
+		}
+	};
+
+	auto read_long = [](nbt::value& parent, const char * name, const int64_t & fallback = 0) -> int64_t
+	{
+		try
+		{
+			auto &namedValue = parent.at(name);
+			if(namedValue.get_type() != nbt::tag_type::Long)
+			{
+				return fallback;
+			}
+			auto & tag_str = namedValue.as<nbt::tag_long>();
+			return tag_str.get();
+		}
+		catch(std::out_of_range e)
+		{
+			// fallback for old world formats
+			return fallback;
+		}
+	};
+
+	try
+	{
+		std::istringstream foo(std::string(output.constData(), output.size()));
+		auto pair = nbt::io::read_compound(foo);
+		is_valid  = pair.first == "";
+
+		if(!is_valid)
+		{
+			return;
+		}
+		std::ostringstream ostr;
+		is_valid = pair.second != nullptr;
+		if(!is_valid)
+		{
+			qDebug() << "FAIL~!!!";
+			return;
+		}
+
+		auto &val = pair.second->at("Data");
+		is_valid = val.get_type() == nbt::tag_type::Compound;
+		if(!is_valid)
+			return;
+
+		m_actualName = read_string(val, "LevelName", m_folderName);
+
+
+		int64_t temp = read_long(val, "LastPlayed", 0);
+		if(temp == 0)
+		{
+			QFileInfo finfo(fullFilePath);
+			m_lastPlayed = finfo.lastModified();
+		}
+		else
+		{
+			m_lastPlayed = QDateTime::fromMSecsSinceEpoch(temp);
+		}
+
+		m_randomSeed = read_long(val, "RandomSeed", 0);
+
+		qDebug() << "World Name:" << m_actualName;
+		qDebug() << "Last Played:" << m_lastPlayed.toString();
+		qDebug() << "Seed:" << m_randomSeed;
+	}
+	catch (nbt::io::input_error e)
+	{
+		qWarning() << "Unable to load" << m_folderName << ":" << e.what();
+		is_valid = false;
+		return;
+	}
 }
 
 bool World::replace(World &with)
@@ -37,7 +153,7 @@ bool World::replace(World &with)
 	bool success = copyPath(with.m_file.filePath(), m_file.path());
 	if (success)
 	{
-		m_name = with.m_name;
+		m_folderName = with.m_folderName;
 		m_file.refresh();
 	}
 	return success;
@@ -64,9 +180,9 @@ bool World::destroy()
 
 bool World::operator==(const World &other) const
 {
-	return is_valid == other.is_valid && name() == other.name();
+	return is_valid == other.is_valid && folderName() == other.folderName();
 }
 bool World::strongCompare(const World &other) const
 {
-	return is_valid == other.is_valid && name() == other.name();
+	return is_valid == other.is_valid && folderName() == other.folderName();
 }