diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3e37c21f..1ef96b74 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,8 +2,8 @@ cmake_minimum_required(VERSION 3.0)
 cmake_policy(SET CMP0017 NEW) # need include() with .cmake
 project(PIP)
 set(PIP_MAJOR    3)
-set(PIP_MINOR    10)
-set(PIP_REVISION 3)
+set(PIP_MINOR    11)
+set(PIP_REVISION 0)
 set(PIP_SUFFIX   )
 set(PIP_COMPANY  SHS)
 set(PIP_DOMAIN   org.SHS)
diff --git a/libs/main/io_devices/pibinarylog.cpp b/libs/main/io_devices/pibinarylog.cpp
index 222e40f3..86d30b6c 100644
--- a/libs/main/io_devices/pibinarylog.cpp
+++ b/libs/main/io_devices/pibinarylog.cpp
@@ -60,6 +60,7 @@ PIBinaryLog::PIBinaryLog() {
 	setThreadedReadBufferSize(65536);
 #endif
 	is_started = is_indexed = is_pause = false;
+	create_index_on_fly                = false;
 	current_index                      = -1;
 	log_size                           = 0;
 	f_new_path                         = nullptr;
@@ -95,7 +96,6 @@ bool PIBinaryLog::openDevice() {
 	is_indexed           = false;
 	is_pause             = false;
 	index.clear();
-	index_pos.clear();
 	log_size = 0;
 	if (mode_ == ReadWrite) {
 		piCoutObj << "Error: ReadWrite mode not supported, use WriteOnly or ReadOnly";
@@ -162,7 +162,6 @@ bool PIBinaryLog::closeDevice() {
 	moveIndex(-1);
 	is_indexed = false;
 	index.clear();
-	index_pos.clear();
 	bool e   = isEmpty();
 	log_size = 0;
 	if (canWrite() && e) {
@@ -293,6 +292,11 @@ void PIBinaryLog::createNewFile(const PIString & path) {
 }
 
 
+void PIBinaryLog::setCreateIndexOnFly(bool yes) {
+	create_index_on_fly = yes;
+}
+
+
 void PIBinaryLog::setPause(bool pause) {
 	pausemutex.lock();
 	is_pause = pause;
@@ -313,12 +317,7 @@ int PIBinaryLog::writeBinLog(int id, const void * data, int size) {
 	}
 	if (is_pause) return 0;
 	logmutex.lock();
-	PIByteArray logdata;
-	logdata << id << size << (PISystemTime::current() - startlogtime) << PIMemoryBlock(data, size);
-	int res = file.write(logdata.data(), logdata.size());
-	file.flush();
-	write_count++;
-	log_size = file.size();
+	int res = writeRecord(id, PISystemTime::current() - startlogtime, data, size);
 	switch (split_mode) {
 	case SplitSize:
 		if (log_size > split_size) createNewFile();
@@ -341,13 +340,8 @@ int PIBinaryLog::writeBinLog(int id, const void * data, int size) {
 
 int PIBinaryLog::writeBinLog_raw(int id, const PISystemTime & time, const void * data, int size) {
 	if (size <= 0 || !canWrite()) return -1;
-	PIByteArray logdata;
-	logdata << id << size << time << PIMemoryBlock(data, size);
 	logmutex.lock();
-	int res = file.write(logdata.data(), logdata.size());
-	file.flush();
-	write_count++;
-	log_size = file.size();
+	int res = writeRecord(id, time, data, size);
 	logmutex.unlock();
 	if (res > 0)
 		return size;
@@ -359,7 +353,7 @@ int PIBinaryLog::writeBinLog_raw(int id, const PISystemTime & time, const void *
 PIByteArray PIBinaryLog::readBinLog(int id, PISystemTime * time, int * readed_id) {
 	if (!canRead()) return PIByteArray();
 	logmutex.lock();
-	BinLogRecord br = readRecord();
+	Record br = readRecord();
 	logmutex.unlock();
 	if (br.id == -1) {
 		piCoutObj << "End of BinLog file";
@@ -411,7 +405,7 @@ void PIBinaryLog::setHeader(const PIByteArray & header) {
 
 
 PIByteArray PIBinaryLog::getHeader() {
-	return binfo.user_header;
+	return index.info.user_header;
 }
 
 
@@ -421,7 +415,7 @@ ssize_t PIBinaryLog::readDevice(void * read_to, ssize_t max_size) {
 	if (!is_thread_ok && lastrecord.id > 0) return lastrecord.data.size();
 	if (!canRead()) return -1;
 	if (max_size <= 0 || read_to == 0) return -1;
-	BinLogRecord br;
+	Record br;
 	br.id = 0;
 	if (filterID.isEmpty()) {
 		br = readRecord();
@@ -476,12 +470,16 @@ bool PIBinaryLog::writeFileHeader() {
 	file.write(&sz, 4);
 	file.write(user_header);
 	file.flush();
+	if (create_index_on_fly) {
+		index.info.user_header = user_header;
+		index.info.path        = file.path();
+	}
 	return true;
 }
 
 
 bool PIBinaryLog::checkFileHeader() {
-	binfo.user_header.clear();
+	index.info.user_header.clear();
 	uchar read_sig[PIBINARYLOG_SIGNATURE_SIZE];
 	for (uint i = 0; i < PIBINARYLOG_SIGNATURE_SIZE; i++)
 		read_sig[i] = 0;
@@ -504,7 +502,7 @@ bool PIBinaryLog::checkFileHeader() {
 		uint32_t sz = 0;
 		file.read(&sz, 4);
 		if (sz > 0) {
-			binfo.user_header = file.read(sz);
+			index.info.user_header = file.read(sz);
 		}
 		return true;
 	}
@@ -515,15 +513,15 @@ bool PIBinaryLog::checkFileHeader() {
 }
 
 
-PIBinaryLog::BinLogRecord PIBinaryLog::readRecord() {
+PIBinaryLog::Record PIBinaryLog::readRecord() {
 	// piCoutObj << "readRecord pos =" << file.pos();
 	logmutex.lock();
 	PIByteArray ba;
-	BinLogRecord br;
+	Record br;
 	lastrecord.id = 0;
 	lastrecord.data.clear();
 	lastrecord.timestamp = PISystemTime();
-	ba.resize(sizeof(BinLogRecord) - sizeof(PIByteArray));
+	ba.resize(sizeof(Record) - sizeof(PIByteArray));
 	if (file.read(ba.data(), ba.size_s()) > 0) {
 		ba >> br.id >> br.size >> br.timestamp;
 	} else {
@@ -542,13 +540,55 @@ PIBinaryLog::BinLogRecord PIBinaryLog::readRecord() {
 		br.id = 0;
 	lastrecord = br;
 	if (br.id == 0) fileError();
-	moveIndex(index_pos.value(file.pos(), -1));
+	moveIndex(index.index_pos.value(file.pos(), -1));
 	logmutex.unlock();
 	//	piCoutObj << "readRecord done";
 	return br;
 }
 
 
+int PIBinaryLog::writeRecord(int id, PISystemTime time, const void * data, int size) {
+	PIByteArray logdata;
+	logdata << id << size << time << PIMemoryBlock(data, size);
+	if (create_index_on_fly) {
+		BinLogIndex bi;
+		bi.id        = id;
+		bi.data_size = size;
+		bi.pos       = file.pos();
+		bi.timestamp = time;
+		index.index << bi;
+		auto & rinfo(index.info.records[id]);
+		if (rinfo.count == 0) {
+			rinfo.id         = id;
+			rinfo.start_time = rinfo.end_time = time;
+			rinfo.minimum_size = rinfo.maximum_size = size;
+		} else {
+			rinfo.start_time   = piMin(rinfo.start_time, time);
+			rinfo.end_time     = piMax(rinfo.end_time, time);
+			rinfo.minimum_size = piMin(rinfo.minimum_size, size);
+			rinfo.maximum_size = piMax(rinfo.maximum_size, size);
+		}
+		++rinfo.count;
+		if (index.info.records_count == 0) {
+			index.info.start_time = index.info.end_time = time;
+		} else {
+			index.info.start_time = piMin(index.info.start_time, time);
+			index.info.end_time   = piMax(index.info.end_time, time);
+		}
+		++index.info.records_count;
+		is_indexed = true;
+	}
+	int ret = file.write(logdata.data(), logdata.size());
+	file.flush();
+	write_count++;
+	log_size = file.size();
+	if (create_index_on_fly) {
+		index.info.log_size = log_size;
+	}
+	return ret;
+}
+
+
 void PIBinaryLog::parseLog(PIFile * f, PIBinaryLog::BinLogInfo * info, PIVector<PIBinaryLog::BinLogIndex> * index) {
 	if (!info && !index) return;
 	if (info) {
@@ -596,16 +636,17 @@ void PIBinaryLog::parseLog(PIFile * f, PIBinaryLog::BinLogInfo * info, PIVector<
 	if (read_version == PIBINARYLOG_VERSION) {
 		uint32_t sz = 0;
 		f->read(&sz, 4);
-		if (sz > 0 && info) {
-			info->user_header = f->read(sz);
+		if (sz > 0) {
+			PIByteArray user_hdr = f->read(sz);
+			if (info) info->user_header = user_hdr;
 		}
 	}
 	PIByteArray ba;
-	BinLogRecord br;
+	Record br;
 	br.id           = 0;
 	br.size         = 0;
 	bool first      = true;
-	size_t hdr_size = sizeof(BinLogRecord) - sizeof(PIByteArray);
+	size_t hdr_size = sizeof(Record) - sizeof(PIByteArray);
 	ba.resize(hdr_size);
 	while (1) {
 		ba.resize(hdr_size);
@@ -690,7 +731,7 @@ bool PIBinaryLog::cutBinLog(const PIBinaryLog::BinLogInfo & src, const PIString
 		return false;
 	}
 	bool first = true;
-	BinLogRecord br;
+	Record br;
 	PISystemTime st;
 	PITimeMeasurer tm;
 	while (!slog.isEnd() && ((slog.pos() <= to) || to < 0)) {
@@ -746,7 +787,7 @@ bool PIBinaryLog::joinBinLogsSerial(const PIStringList & src,
 			dtime = lt;
 		}
 		tm.reset();
-		BinLogRecord br;
+		Record br;
 		PISystemTime st;
 		while (!slog.isEnd()) {
 			br = slog.readRecord();
@@ -787,12 +828,10 @@ bool PIBinaryLog::createIndex() {
 	llong cp = file.pos();
 	file.seekToBegin();
 	index.clear();
-	index_pos.clear();
-	parseLog(&file, &binfo, &index);
+	parseLog(&file, &index.info, &index.index);
+	index.makeIndexPos();
 	file.seek(cp);
-	is_indexed = !index.isEmpty();
-	for (uint i = 0; i < index.size(); i++)
-		index_pos[index[i].pos] = i;
+	is_indexed = !index.index.isEmpty();
 	logmutex.unlock();
 	return is_indexed;
 }
@@ -800,8 +839,8 @@ bool PIBinaryLog::createIndex() {
 
 int PIBinaryLog::posForTime(const PISystemTime & time) {
 	int ci = -1;
-	for (uint i = 0; i < index.size(); i++) {
-		if (time <= index[i].timestamp && (filterID.contains(index[i].id) || filterID.isEmpty())) {
+	for (uint i = 0; i < index.index.size(); i++) {
+		if (time <= index.index[i].timestamp && (filterID.contains(index.index[i].id) || filterID.isEmpty())) {
 			ci = i;
 			break;
 		}
@@ -814,12 +853,12 @@ void PIBinaryLog::seekTo(int rindex) {
 	//	piCoutObj << "seekTo";
 	logmutex.lock();
 	pausemutex.lock();
-	if (rindex < index.size_s() && rindex >= 0) {
-		file.seek(index[rindex].pos);
-		moveIndex(index_pos.value(file.pos(), -1));
+	if (rindex < index.index.size_s() && rindex >= 0) {
+		file.seek(index.index[rindex].pos);
+		moveIndex(index.index_pos.value(file.pos(), -1));
 		// double prev_pt = play_time;
-		play_time            = index[rindex].timestamp.toMilliseconds();
-		lastrecord.timestamp = index[rindex].timestamp;
+		play_time            = index.index[rindex].timestamp.toMilliseconds();
+		lastrecord.timestamp = index.index[rindex].timestamp;
 		if (play_mode == PlayRealTime) {
 			startlogtime = PISystemTime::current() - lastrecord.timestamp;
 		}
@@ -842,8 +881,8 @@ bool PIBinaryLog::seek(const PISystemTime & time) {
 
 bool PIBinaryLog::seek(llong filepos) {
 	int ci = -1;
-	for (uint i = 0; i < index.size(); i++) {
-		if (filepos <= index[i].pos && (filterID.contains(index[i].id) || filterID.isEmpty())) {
+	for (uint i = 0; i < index.index.size(); i++) {
+		if (filepos <= index.index[i].pos && (filterID.contains(index.index[i].id) || filterID.isEmpty())) {
 			ci = i;
 			break;
 		}
@@ -856,6 +895,27 @@ bool PIBinaryLog::seek(llong filepos) {
 }
 
 
+int PIBinaryLog::pos() const {
+	if (is_indexed) return current_index;
+	return -1;
+}
+
+
+PIByteArray PIBinaryLog::saveIndex() const {
+	if (!is_indexed) return PIByteArray();
+	return piSerialize(index);
+}
+
+
+bool PIBinaryLog::loadIndex(PIByteArray saved) {
+	if (!canRead() || saved.isEmpty()) return false;
+	index = piDeserialize<CompleteIndex>(saved);
+	index.makeIndexPos();
+	is_indexed = index.index.isNotEmpty();
+	return is_indexed;
+}
+
+
 PIString PIBinaryLog::constructFullPathDevice() const {
 	PIString ret;
 	ret += logDir() + ":" + filePrefix() + ":" + PIString::fromNumber(defaultID()) + ":";
@@ -928,3 +988,17 @@ void PIBinaryLog::propertyChanged(const char * s) {
 	split_count = property("splitRecordCount").toInt();
 	//	piCoutObj << "propertyChanged" << s << play_mode;
 }
+
+
+void PIBinaryLog::CompleteIndex::clear() {
+	info = BinLogInfo();
+	index.clear();
+	index_pos.clear();
+}
+
+
+void PIBinaryLog::CompleteIndex::makeIndexPos() {
+	index_pos.clear();
+	for (uint i = 0; i < index.size(); i++)
+		index_pos[index[i].pos] = i;
+}
diff --git a/libs/main/io_devices/pibinarylog.h b/libs/main/io_devices/pibinarylog.h
index f8cc21b7..9c1c8460 100644
--- a/libs/main/io_devices/pibinarylog.h
+++ b/libs/main/io_devices/pibinarylog.h
@@ -26,6 +26,7 @@
 #ifndef PIBINARYLOG_H
 #define PIBINARYLOG_H
 
+#include "pichunkstream.h"
 #include "pifile.h"
 
 //! \ingroup IO
@@ -54,6 +55,8 @@ public:
 		SplitCount /*! Separate files by records count */
 	};
 
+#pragma pack(push, 8)
+
 	//! \brief Struct contains information about all records with same ID
 	struct PIP_EXPORT BinLogRecordInfo {
 		BinLogRecordInfo() {
@@ -68,17 +71,6 @@ public:
 		PISystemTime end_time;
 	};
 
-	//! \brief Struct contains full information about Binary Log file and about all Records using map of \a BinLogRecordInfo
-	struct PIP_EXPORT BinLogInfo {
-		PIString path;
-		int records_count;
-		llong log_size;
-		PISystemTime start_time;
-		PISystemTime end_time;
-		PIMap<int, BinLogRecordInfo> records;
-		PIByteArray user_header;
-	};
-
 	//! \brief Struct contains position, ID and timestamp of record in file
 	struct PIP_EXPORT BinLogIndex {
 		int id;
@@ -87,6 +79,19 @@ public:
 		PISystemTime timestamp;
 	};
 
+#pragma pack(pop)
+
+	//! \brief Struct contains full information about Binary Log file and about all Records using map of \a BinLogRecordInfo
+	struct PIP_EXPORT BinLogInfo {
+		PIString path;
+		int records_count = 0;
+		llong log_size    = 0L;
+		PISystemTime start_time;
+		PISystemTime end_time;
+		PIMap<int, BinLogRecordInfo> records;
+		PIByteArray user_header;
+	};
+
 
 	//! Current \a PlayMode
 	PlayMode playMode() const { return play_mode; }
@@ -121,6 +126,9 @@ public:
 	//! Returns if rapid start enabled
 	bool rapidStart() const { return rapid_start; }
 
+	//! Returns if index creates while writing
+	bool createIndexOnFly() const { return create_index_on_fly; }
+
 	//! Create binlog file with Filename = path
 	void createNewFile(const PIString & path);
 
@@ -142,6 +150,9 @@ public:
 	//! If enabled BinLog \a ThreadedRead starts without delay for first record, i.e. first record will be readed immediately
 	void setRapidStart(bool enabled) { setProperty("rapidStart", enabled); }
 
+	//! Set index creation while writing
+	void setCreateIndexOnFly(bool yes);
+
 	//! Set play speed to "speed", default value is 1.0x
 	//! Also this function set \a playMode to \a PlayVariableSpeed
 	void setPlaySpeed(double speed) {
@@ -258,12 +269,12 @@ public:
 
 	//! Get binlog info \a BinLogInfo
 	BinLogInfo logInfo() const {
-		if (is_indexed) return binfo;
+		if (is_indexed) return index.info;
 		return getLogInfo(path());
 	}
 
 	//! Get binlog index \a BinLogIndex, need \a createIndex before getting index
-	const PIVector<BinLogIndex> & logIndex() const { return index; }
+	const PIVector<BinLogIndex> & logIndex() const { return index.index; }
 
 	//! Create index of current binlog file
 	bool createIndex();
@@ -284,10 +295,10 @@ public:
 	bool seek(llong filepos);
 
 	//! Get current record index (position record in file)
-	int pos() const {
-		if (is_indexed) return current_index;
-		return -1;
-	}
+	int pos() const;
+
+	PIByteArray saveIndex() const;
+	bool loadIndex(PIByteArray saved);
 
 	//! \handlers
 	//! \{
@@ -342,38 +353,89 @@ protected:
 	DeviceInfoFlags deviceInfoFlags() const override { return PIIODevice::Reliable; }
 
 private:
-	struct PIP_EXPORT BinLogRecord {
+	struct PIP_EXPORT Record {
 		int id;
 		int size;
 		PISystemTime timestamp;
 		PIByteArray data;
 	};
+	struct PIP_EXPORT CompleteIndex {
+		void clear();
+		void makeIndexPos();
+		BinLogInfo info;
+		PIVector<BinLogIndex> index;
+		PIMap<llong, int> index_pos;
+	};
+	BINARY_STREAM_FRIEND(CompleteIndex)
 
 	bool writeFileHeader();
 	bool checkFileHeader();
-	BinLogRecord readRecord();
+	Record readRecord();
+	int writeRecord(int id, PISystemTime time, const void * data, int size);
 	static void parseLog(PIFile * f, BinLogInfo * info, PIVector<BinLogIndex> * index);
 	void moveIndex(int i);
 	static PIString getLogfilePath(const PIString & log_dir, const PIString & prefix);
 
-	PIVector<BinLogIndex> index;
-	PIMap<llong, int> index_pos;
-	BinLogInfo binfo;
+	CompleteIndex index;
 
 	PlayMode play_mode;
 	SplitMode split_mode;
 	PIFile file;
-	BinLogRecord lastrecord;
+	Record lastrecord;
 	PISystemTime startlogtime, play_delay, split_time, pause_time;
 	mutable PIMutex logmutex, pausemutex;
 	double play_time, play_speed;
 	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;
+	bool is_started, is_thread_ok, is_indexed, rapid_start, is_pause, create_index_on_fly;
 	PIByteArray user_header;
 	std::function<PIString()> f_new_path;
 };
 
+
+BINARY_STREAM_WRITE(PIBinaryLog::BinLogInfo) {
+	PIChunkStream cs;
+	cs.add(1, v.path)
+		.add(2, v.records_count)
+		.add(3, v.log_size)
+		.add(4, v.start_time)
+		.add(5, v.end_time)
+		.add(6, v.records)
+		.add(7, v.user_header);
+	s << cs.data();
+	return s;
+}
+
+BINARY_STREAM_READ(PIBinaryLog::BinLogInfo) {
+	PIByteArray csba;
+	s >> csba;
+	PIChunkStream cs(csba);
+	while (!cs.atEnd()) {
+		switch (cs.read()) {
+		case 1: cs.get(v.path); break;
+		case 2: cs.get(v.records_count); break;
+		case 3: cs.get(v.log_size); break;
+		case 4: cs.get(v.start_time); break;
+		case 5: cs.get(v.end_time); break;
+		case 6: cs.get(v.records); break;
+		case 7: cs.get(v.user_header); break;
+		}
+	}
+	return s;
+}
+
+
+BINARY_STREAM_WRITE(PIBinaryLog::CompleteIndex) {
+	s << v.info << v.index;
+	return s;
+}
+
+BINARY_STREAM_READ(PIBinaryLog::CompleteIndex) {
+	s >> v.info >> v.index;
+	return s;
+}
+
+
 //! \relatesalso PICout \brief Output operator PIBinaryLog::BinLogInfo to PICout
 inline PICout operator<<(PICout s, const PIBinaryLog::BinLogInfo & bi) {
 	s.space();
diff --git a/libs/main/io_devices/pifile.cpp b/libs/main/io_devices/pifile.cpp
index 950dc208..0b4f0763 100644
--- a/libs/main/io_devices/pifile.cpp
+++ b/libs/main/io_devices/pifile.cpp
@@ -622,3 +622,18 @@ bool PIFile::applyFileInfo(const PIString & path, const PIFile::FileInfo & info)
 #endif
 	return true;
 }
+
+
+PIByteArray PIFile::readAll(const PIString & path, bool forceRead) {
+	PIFile f(path, PIIODevice::ReadOnly);
+	if (!f.isOpened()) return PIByteArray();
+	return f.readAll(forceRead);
+}
+
+
+int PIFile::writeAll(const PIString & path, const PIByteArray & data) {
+	PIFile f(path, PIIODevice::ReadWrite);
+	if (!f.isOpened()) return 0;
+	f.clear();
+	return f.write(data.data(), data.size_s());
+}
diff --git a/libs/main/io_devices/pifile.h b/libs/main/io_devices/pifile.h
index 0adc4d7b..8f373499 100644
--- a/libs/main/io_devices/pifile.h
+++ b/libs/main/io_devices/pifile.h
@@ -293,6 +293,14 @@ public:
 	//! \~russian Применяет параметры "info" к файлу или директории с путём "info".path
 	static bool applyFileInfo(const FileInfo & info) { return applyFileInfo(info.path, info); }
 
+	//! \~english Read all file content at path "path" to byte array and return it.
+	//! \~russian Читает всё содержимое файла по пути "path" и возвращает его как массив байтов.
+	static PIByteArray readAll(const PIString & path, bool forceRead = false);
+
+	//! \~english Clear file at path "path" and write "data", returns written bytes.
+	//! \~russian Очищает файл по пути "path", пишет туда "data" и возвращает количество записанных байт.
+	static int writeAll(const PIString & path, const PIByteArray & data);
+
 	//! \handlers
 	//! \{