next easing of PIChunkStream::extract()

libs/main/core/pichunkstream.h

@@ -67,8 +67,10 @@ public:
 	//! Add data to this chunk strean with ID "id" and value "data"
 	template <typename T> PIChunkStream & add(int id, const T & data) {*this << ChunkConst<T>(id, data); return *this;}
 
-	//! Extract %PIByteArray from "data" and set it current stream. Returns if has data to read.
-	bool extract(PIByteArray & data);
+	//! Extract %PIByteArray from "data" and set it current stream.
+	//! If "read_all" then call \a readAll() after extract.
+	//! Returns if has data to read.
+	bool extract(PIByteArray & data, bool read_all = false);
 
 	void setSource(const PIByteArray & data);
 	void setSource(PIByteArray * data);