diff --git a/qad/CMakeLists.txt b/qad/CMakeLists.txt
index a9e6ebb..210183b 100644
--- a/qad/CMakeLists.txt
+++ b/qad/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.0)
 cmake_policy(SET CMP0017 NEW) # need include() with .cmake
 project(qad)
 set(_QAD_MAJOR    1)
-set(_QAD_MINOR    6)
+set(_QAD_MINOR    7)
 set(_QAD_REVISION 0)
 set(_QAD_SUFFIX   )
 set(_QAD_COMPANY  SHS)
diff --git a/qad/utils/chunkstream.h b/qad/utils/chunkstream.h
index d1b7f3f..0ade48f 100644
--- a/qad/utils/chunkstream.h
+++ b/qad/utils/chunkstream.h
@@ -46,9 +46,15 @@ public:
 		int id;
 		T data;
 	};
-	template <typename T> static Chunk<T> chunk(int id, const T & data) {return Chunk<T>(id, data);}
+	template <typename T>
+	struct ChunkConst {
+		ChunkConst(int i, const T & d): id(i), data(d) {}
+		int id;
+		const T & data;
+	};
+	template <typename T> static ChunkConst<T> chunk(int id, const T & data) {return ChunkConst<T>(id, data);}
 
-	template <typename T> ChunkStream & add(int id, const T & data) {*this << Chunk<T>(id, data); return *this;}
+	template <typename T> ChunkStream & add(int id, const T & data) {*this << ChunkConst<T>(id, data); return *this;}
 
 	void setSource(const QByteArray & data);
 	void setSource(QDataStream & str);
@@ -88,6 +94,7 @@ private:
 	QMap<int, QByteArray> data_map;
 
 	template <typename T> friend ChunkStream & operator <<(ChunkStream & s, const ChunkStream::Chunk<T> & c);
+	template <typename T> friend ChunkStream & operator <<(ChunkStream & s, const ChunkStream::ChunkConst<T> & c);
 };
 
 template <typename T>
@@ -111,5 +118,26 @@ ChunkStream & operator <<(ChunkStream & s, const ChunkStream::Chunk<T> & c) {
 	}
 	return s;
 }
+template <typename T>
+ChunkStream & operator <<(ChunkStream & s, const ChunkStream::ChunkConst<T> & c) {
+	QByteArray ba;
+	QDataStream bas(&ba, QIODevice::WriteOnly);
+	bas.setVersion(QDataStream::Qt_4_8);
+	bas << c.data;
+	switch (s.version_) {
+	case ChunkStream::Version_1:
+		s.stream_ << c.id << ba;
+		break;
+	case ChunkStream::Version_2:
+		if (s.data_->isEmpty())
+			s.stream_ << uchar(uchar(s.version_) | 0x80);
+		ChunkStream::writeVInt(s.stream_, c.id);
+		ChunkStream::writeVInt(s.stream_, ba.size());
+		s.stream_.writeRawData(ba.data(), ba.size());
+		break;
+	default: break;
+	}
+	return s;
+}
 
 #endif // CHUNKSTREAM_H