dbms: added copyData function for Read/Write buffers.

dbms/include/DB/IO/copyData.h

@@ -0,0 +1,17 @@
+#ifndef DBMS_IO_COPY_DATA_H
+#define DBMS_IO_COPY_DATA_H
+
+#include <DB/IO/ReadBuffer.h>
+#include <DB/IO/WriteBuffer.h>
+
+
+namespace DB
+{
+
+/** Копирует данные из ReadBuffer в WriteBuffer
+  */
+void copyData(ReadBuffer & from, WriteBuffer & to);
+
+}
+
+#endif

dbms/src/IO/copyData.cpp

@@ -0,0 +1,16 @@
+#include <DB/IO/copyData.h>
+
+
+namespace DB
+{
+
+void copyData(ReadBuffer & from, WriteBuffer & to)
+{
+	while (!from.eof())
+	{
+		to.write(from.buffer().begin(), from.buffer().end() - from.buffer().begin());
+		from.position() = from.buffer().end();
+	}
+}
+	
+}