binlog user header

lib/main/io_devices/pibinarylog.h

@@ -25,7 +25,7 @@
 
 #include "pifile.h"
 
-#define PIBINARYLOG_VERSION 0x31
+#define PIBINARYLOG_VERSION 0x32
 namespace __S__PIBinaryLog {
 static const uchar binlog_sig[] = {'B','I','N','L','O','G'};
 }
@@ -207,7 +207,12 @@ public:
 	//! Returns timestamp of last readed record
 	PISystemTime lastReadedTimestamp() const {return lastrecord.timestamp;}
 
-	
+	//!Set custom file header, you can get it back when read this binlog
+	void setHeader(const PIByteArray & header);
+
+	//!Get custom file header
+	PIByteArray getHeader();
+
 #ifdef DOXYGEN
 	//! Read one message from binlog file, with ID contains in "filterID" or any ID, if "filterID" is empty
 	int read(void *read_to, int max_size);
@@ -321,6 +326,7 @@ private:
 	llong split_size, log_size;
 	int write_count, split_count, default_id, current_index;
 	bool is_started, is_thread_ok, is_indexed, rapid_start, is_pause;
+	PIByteArray user_header, user_header_readed;
 };
 
 //! \relatesalso PICout \relatesalso PIBinaryLog::BinLogInfo \brief Output operator to PICout