diff --git a/dbms/include/DB/Core/ErrorCodes.h b/dbms/include/DB/Core/ErrorCodes.h
index ac8f3dcf89b..ee18904589c 100644
--- a/dbms/include/DB/Core/ErrorCodes.h
+++ b/dbms/include/DB/Core/ErrorCodes.h
@@ -46,9 +46,6 @@ namespace ErrorCodes
 		TOO_LESS_ARGUMENTS_FOR_FUNCTION,
 		UNKNOWN_ELEMENT_IN_AST,
 		CANNOT_PARSE_DATE,
-		TOO_SMALL_SIZE_COMPRESSED,
-		TOO_LARGE_SIZE_COMPRESSED,
-		CANNOT_DECOMPRESS_CORRUPTED_DATA,
 	};
 }
 
diff --git a/dbms/include/DB/IO/CompressedInputStream.h b/dbms/include/DB/IO/CompressedInputStream.h
new file mode 100644
index 00000000000..34f0659d38c
--- /dev/null
+++ b/dbms/include/DB/IO/CompressedInputStream.h
@@ -0,0 +1,74 @@
+#ifndef DBMS_COMMON_COMPRESSED_INPUT_STREAM_H
+#define DBMS_COMMON_COMPRESSED_INPUT_STREAM_H
+
+#include <istream>
+#include <ostream>
+#include <vector>
+
+#include <Poco/BufferedStreamBuf.h>
+
+#include <DB/IO/CompressedStream.h>
+
+
+namespace DB
+{
+
+
+/** Аналогично Poco::InflatingStreamBuf, но используется библиотека QuickLZ,
+  * а также поддерживается только istream.
+  */
+class DecompressingStreamBuf : public Poco::BufferedStreamBuf
+{
+public:
+	DecompressingStreamBuf(std::istream & istr);
+
+	/** прочитать целиком один сжатый блок данных;
+	  */
+	void getChunk(std::vector<char> & res);
+
+protected:
+	int readFromDevice(char * buffer, std::streamsize length);
+
+private:
+	size_t pos_in_buffer;
+	std::istream * p_istr;
+	std::vector<char> uncompressed_buffer;
+	std::vector<char> compressed_buffer;
+	std::vector<char> scratch;
+
+	/** Читает и разжимает следующий кусок сжатых данных. */
+	void readCompressedChunk();
+};
+
+
+/** Базовый класс для CompressedInputStream; содержит DecompressingStreamBuf
+  */
+class DecompressingIOS : public virtual std::ios
+{
+public:
+	DecompressingIOS(std::istream & istr);
+	DecompressingStreamBuf * rdbuf();
+
+protected:
+	DecompressingStreamBuf buf;
+};
+
+
+/** Разжимает данные, сжатые с помощью алгоритма QuickLZ.
+  */
+class CompressedInputStream : public DecompressingIOS, public std::istream
+{
+public:
+	CompressedInputStream(std::istream & istr);
+	int close();
+
+	/** прочитать целиком один сжатый блок данных
+      */
+	void getChunk(std::vector<char> & res);
+};
+
+
+}
+
+
+#endif
diff --git a/dbms/include/DB/IO/CompressedOutputStream.h b/dbms/include/DB/IO/CompressedOutputStream.h
new file mode 100644
index 00000000000..fb673020dfd
--- /dev/null
+++ b/dbms/include/DB/IO/CompressedOutputStream.h
@@ -0,0 +1,66 @@
+#ifndef DBMS_COMMON_COMPRESSED_OUTPUT_STREAM_H
+#define DBMS_COMMON_COMPRESSED_OUTPUT_STREAM_H
+
+#include <istream>
+#include <ostream>
+#include <vector>
+
+#include <Poco/BufferedStreamBuf.h>
+
+#include <quicklz/quicklz_level1.h>
+
+#include <DB/IO/CompressedStream.h>
+
+
+namespace DB
+{
+
+
+/** Аналогично Poco::DeflatingStreamBuf, но используется библиотека QuickLZ,
+  * а также поддерживается только ostream.
+  */
+class CompressingStreamBuf : public Poco::BufferedStreamBuf
+{
+public:
+	CompressingStreamBuf(std::ostream & ostr);
+	~CompressingStreamBuf();
+	int close();
+
+protected:
+	int writeToDevice(const char * buffer, std::streamsize length);
+
+private:
+	std::ostream * p_ostr;
+	std::vector<char> compressed_buffer;
+	std::vector<char> scratch;
+};
+
+
+/** Базовый класс для CompressedOutputStream; содержит CompressingStreamBuf
+  */
+class CompressingIOS : public virtual std::ios
+{
+public:
+	CompressingIOS(std::ostream & ostr);
+	CompressingStreamBuf * rdbuf();
+
+protected:
+	CompressingStreamBuf buf;
+};
+
+
+/** Сжимает всё с помощью алгоритма QuickLZ блоками не более DBMS_COMPRESSING_STREAM_BUFFER_SIZE.
+  * Для записи последнего блока, следует вызвать метод close().
+  */
+class CompressedOutputStream : public CompressingIOS, public std::ostream
+{
+public:
+	CompressedOutputStream(std::ostream & ostr);
+	int close();
+};
+
+
+}
+
+
+#endif
diff --git a/dbms/include/DB/IO/CompressedReadBuffer.h b/dbms/include/DB/IO/CompressedReadBuffer.h
index cb373eeddac..7d10e334a62 100644
--- a/dbms/include/DB/IO/CompressedReadBuffer.h
+++ b/dbms/include/DB/IO/CompressedReadBuffer.h
@@ -4,16 +4,12 @@
 #include <vector>
 #include <algorithm>
 
-#include <snappy.h>
+#include <quicklz/quicklz_level1.h>
 
 #include <DB/Core/Exception.h>
 #include <DB/Core/ErrorCodes.h>
 #include <DB/IO/ReadBuffer.h>
-#include <DB/IO/VarInt.h>
-
-
-/// Если сжатый кусок больше 1GB - значит ошибка
-#define DB_COMPRESSED_BUFFER_MAX_COMPRESSED_SIZE 0x40000000
+#include <DB/IO/CompressedStream.h>
 
 
 namespace DB
@@ -25,39 +21,54 @@ private:
 	ReadBuffer & in;
 
 	std::vector<char> compressed_buffer;
+	std::vector<char> decompressed_buffer;
+	char scratch[QLZ_SCRATCH_DECOMPRESS];
+
+	size_t pos_in_buffer;
 
 public:
 	CompressedReadBuffer(ReadBuffer & in_)
-		: in(in_)
+		: in(in_),
+		compressed_buffer(QUICKLZ_HEADER_SIZE),
+		pos_in_buffer(0)
 	{
 	}
 
+	/** Читает и разжимает следующий кусок сжатых данных. */
+	void readCompressedChunk()
+	{
+		in.readStrict(&compressed_buffer[0], QUICKLZ_HEADER_SIZE);
+
+		size_t size_compressed = qlz_size_compressed(&compressed_buffer[0]);
+		size_t size_decompressed = qlz_size_decompressed(&compressed_buffer[0]);
+
+		compressed_buffer.resize(size_compressed);
+		decompressed_buffer.resize(size_decompressed);
+
+		in.readStrict(&compressed_buffer[QUICKLZ_HEADER_SIZE], size_compressed - QUICKLZ_HEADER_SIZE);
+		
+		qlz_decompress(&compressed_buffer[0], &decompressed_buffer[0], scratch);
+
+		pos_in_buffer = 0;
+	}
+
 	bool next()
 	{
-		if (in.eof())
-			return false;
+		if (pos_in_buffer == decompressed_buffer.size())
+		{
+			if (in.eof())
+				return false;
 
-		size_t size_compressed = 0;
-		readVarUInt(size_compressed, in);
-		if (size_compressed == 0)
-			throw Exception("Too small size_compressed", ErrorCodes::TOO_SMALL_SIZE_COMPRESSED);
-		if (size_compressed > DB_COMPRESSED_BUFFER_MAX_COMPRESSED_SIZE)
-			throw Exception("Too large size_compressed", ErrorCodes::TOO_LARGE_SIZE_COMPRESSED);
+			readCompressedChunk();
+		}
+	
+		size_t bytes_to_copy = std::min(decompressed_buffer.size() - pos_in_buffer,
+			static_cast<size_t>(DEFAULT_READ_BUFFER_SIZE));
+		std::memcpy(working_buffer.begin(), &decompressed_buffer[pos_in_buffer], bytes_to_copy);
 
-		compressed_buffer.resize(size_compressed);
-		in.readStrict(&compressed_buffer[0], size_compressed);
-
-		size_t size_decompressed = 0;
-		if (!snappy::GetUncompressedLength(&compressed_buffer[0], size_compressed, &size_decompressed))
-			throw Exception("Cannot decompress corrupted data", ErrorCodes::CANNOT_DECOMPRESS_CORRUPTED_DATA);
-		
-		internal_buffer.resize(size_decompressed);
-
-		if (!snappy::RawUncompress(&compressed_buffer[0], size_compressed, &internal_buffer[0]))
-			throw Exception("Cannot decompress corrupted data", ErrorCodes::CANNOT_DECOMPRESS_CORRUPTED_DATA);
-
-		working_buffer = Buffer(working_buffer.begin(), working_buffer.begin() + size_decompressed);
+		pos_in_buffer += bytes_to_copy;
 		pos = working_buffer.begin();
+		working_buffer = Buffer(working_buffer.begin(), working_buffer.begin() + bytes_to_copy);
 
 		return true;
 	}
@@ -65,6 +76,4 @@ public:
 
 }
 
-#undef DB_COMPRESSED_BUFFER_MAX_COMPRESSED_SIZE
-
 #endif
diff --git a/dbms/include/DB/IO/CompressedStream.h b/dbms/include/DB/IO/CompressedStream.h
new file mode 100644
index 00000000000..1c1e0e55eff
--- /dev/null
+++ b/dbms/include/DB/IO/CompressedStream.h
@@ -0,0 +1,11 @@
+#ifndef DBMS_COMMON_COMPRESSING_STREAM_DEFINES_H
+#define DBMS_COMMON_COMPRESSING_STREAM_DEFINES_H
+
+/** Общие для CompressingStream.h и DecompressingStream.h дефайны */
+
+#define DBMS_STREAM_BUFFER_SIZE 4096
+#define DBMS_COMPRESSING_STREAM_BUFFER_SIZE 1048576
+#define QUICKLZ_ADDITIONAL_SPACE 400
+#define QUICKLZ_HEADER_SIZE 9
+
+#endif
diff --git a/dbms/include/DB/IO/CompressedWriteBuffer.h b/dbms/include/DB/IO/CompressedWriteBuffer.h
index f1f70a343f9..0e0a5019f03 100644
--- a/dbms/include/DB/IO/CompressedWriteBuffer.h
+++ b/dbms/include/DB/IO/CompressedWriteBuffer.h
@@ -1,10 +1,10 @@
 #ifndef DBMS_COMMON_COMPRESSED_WRITEBUFFER_H
 #define DBMS_COMMON_COMPRESSED_WRITEBUFFER_H
 
-#include <snappy.h>
+#include <quicklz/quicklz_level1.h>
 
 #include <DB/IO/WriteBuffer.h>
-#include <DB/IO/VarInt.h>
+#include <DB/IO/CompressedStream.h>
 
 
 namespace DB
@@ -15,7 +15,9 @@ class CompressedWriteBuffer : public WriteBuffer
 private:
 	WriteBuffer & out;
 
-	std::vector<char> compressed_buffer;
+	char compressed_buffer[DBMS_COMPRESSING_STREAM_BUFFER_SIZE + QUICKLZ_ADDITIONAL_SPACE];
+	char scratch[QLZ_SCRATCH_COMPRESS];
+
 	size_t compressed_bytes;
 
 public:
@@ -23,18 +25,15 @@ public:
 
 	void next()
 	{
-		compressed_buffer.resize(snappy::MaxCompressedLength(pos - working_buffer.begin()));
-		size_t compressed_size = 0;
-		snappy::RawCompress(
+		size_t compressed_size = qlz_compress(
 			working_buffer.begin(),
+			compressed_buffer,
 			pos - working_buffer.begin(),
-			&compressed_buffer[0],
-			&compressed_size);
+			scratch);
 
-		DB::writeVarUInt(compressed_size, out);
-		out.write(&compressed_buffer[0], compressed_size);
+		out.write(compressed_buffer, compressed_size);
 		pos = working_buffer.begin();
-		compressed_bytes += compressed_size + DB::getLengthOfVarUInt(compressed_size);
+		compressed_bytes += compressed_size;
 	}
 
 	/// Объём данных, которые были сжаты
diff --git a/dbms/src/IO/CompressedInputStream.cpp b/dbms/src/IO/CompressedInputStream.cpp
new file mode 100644
index 00000000000..5a8edfe8e2c
--- /dev/null
+++ b/dbms/src/IO/CompressedInputStream.cpp
@@ -0,0 +1,116 @@
+#include <algorithm>
+
+#include <quicklz/quicklz_level1.h>
+
+#include <DB/IO/CompressedInputStream.h>
+
+
+namespace DB
+{
+
+
+DecompressingStreamBuf::DecompressingStreamBuf(std::istream & istr)
+	: Poco::BufferedStreamBuf(DBMS_STREAM_BUFFER_SIZE, std::ios::in),
+	pos_in_buffer(0),
+	p_istr(&istr),
+	compressed_buffer(QUICKLZ_HEADER_SIZE),
+	scratch(QLZ_SCRATCH_DECOMPRESS)
+{
+}
+
+
+void DecompressingStreamBuf::getChunk(std::vector<char> & res)
+{
+	readCompressedChunk();
+	pos_in_buffer = uncompressed_buffer.size();
+	res.resize(pos_in_buffer);
+	memcpy(&res[0], &uncompressed_buffer[0], pos_in_buffer);
+}
+
+
+void DecompressingStreamBuf::readCompressedChunk()
+{
+	/// прочитаем заголовок
+	p_istr->read(&compressed_buffer[0], QUICKLZ_HEADER_SIZE);
+
+	if (!p_istr->good())
+		return;
+
+	size_t size_compressed = qlz_size_compressed(&compressed_buffer[0]);
+	size_t size_decompressed = qlz_size_decompressed(&compressed_buffer[0]);
+
+	compressed_buffer.resize(size_compressed);
+	uncompressed_buffer.resize(size_decompressed);
+
+	/// считаем остаток сжатого блока
+
+	p_istr->read(&compressed_buffer[QUICKLZ_HEADER_SIZE], size_compressed - QUICKLZ_HEADER_SIZE);
+
+	if (!p_istr->good())
+		return;
+
+	/// разжимаем блок
+	qlz_decompress(&compressed_buffer[0], &uncompressed_buffer[0], &scratch[0]);
+}
+
+
+int DecompressingStreamBuf::readFromDevice(char * buffer, std::streamsize length)
+{
+	if (length == 0 || !p_istr)
+		return 0;
+
+	size_t bytes_processed = 0;
+
+	while (bytes_processed < static_cast<size_t>(length))
+	{
+		if (pos_in_buffer == uncompressed_buffer.size())
+		{
+			readCompressedChunk();
+			pos_in_buffer = 0;
+
+			if (!p_istr->good())
+			{
+				p_istr = 0;
+				return bytes_processed;
+			}
+		}
+
+		size_t bytes_to_copy = std::min(
+			uncompressed_buffer.size() - pos_in_buffer,
+			static_cast<size_t>(length) - bytes_processed);
+		
+		memcpy(buffer + bytes_processed, &uncompressed_buffer[pos_in_buffer], bytes_to_copy);
+		pos_in_buffer += bytes_to_copy;
+		bytes_processed += bytes_to_copy;
+	}
+
+	return static_cast<int>(length);
+}
+
+
+DecompressingIOS::DecompressingIOS(std::istream & istr)
+	: buf(istr)
+{
+	poco_ios_init(&buf);
+}
+
+
+DecompressingStreamBuf * DecompressingIOS::rdbuf()
+{
+	return &buf;
+}
+
+
+CompressedInputStream::CompressedInputStream(std::istream & istr)
+	: DecompressingIOS(istr),
+	std::istream(&buf)
+{
+}
+
+
+void CompressedInputStream::getChunk(std::vector<char> & res)
+{
+	buf.getChunk(res);
+}
+
+}
diff --git a/dbms/src/IO/CompressedOutputStream.cpp b/dbms/src/IO/CompressedOutputStream.cpp
new file mode 100644
index 00000000000..9877dbcac65
--- /dev/null
+++ b/dbms/src/IO/CompressedOutputStream.cpp
@@ -0,0 +1,74 @@
+#include <algorithm>
+
+#include <DB/IO/CompressedOutputStream.h>
+
+
+namespace DB
+{
+
+
+CompressingStreamBuf::CompressingStreamBuf(std::ostream & ostr)
+	: Poco::BufferedStreamBuf(DBMS_COMPRESSING_STREAM_BUFFER_SIZE, std::ios::out),
+	p_ostr(&ostr),
+	compressed_buffer(DBMS_COMPRESSING_STREAM_BUFFER_SIZE + QUICKLZ_ADDITIONAL_SPACE),
+	scratch(QLZ_SCRATCH_COMPRESS)
+{
+}
+
+
+CompressingStreamBuf::~CompressingStreamBuf()
+{
+	close();
+}
+
+
+int CompressingStreamBuf::close()
+{
+	sync();
+	return 0;
+}
+
+
+int CompressingStreamBuf::writeToDevice(const char * buffer, std::streamsize length)
+{
+	if (length == 0 || !p_ostr)
+		return 0;
+
+	size_t compressed_size = qlz_compress(
+		buffer,
+		&compressed_buffer[0],
+		length,
+		&scratch[0]);
+
+	p_ostr->write(&compressed_buffer[0], compressed_size);
+	return static_cast<int>(length);
+}
+
+
+CompressingIOS::CompressingIOS(std::ostream & ostr)
+	: buf(ostr)
+{
+	poco_ios_init(&buf);
+}
+
+
+CompressingStreamBuf * CompressingIOS::rdbuf()
+{
+	return &buf;
+}
+
+
+CompressedOutputStream::CompressedOutputStream(std::ostream & ostr)
+	: CompressingIOS(ostr),
+	std::ostream(&buf)
+{
+}
+
+
+int CompressedOutputStream::close()
+{
+	return buf.close();
+}
+
+
+}
diff --git a/dbms/src/IO/tests/compressed_buffer.cpp b/dbms/src/IO/tests/compressed_buffer.cpp
new file mode 100644
index 00000000000..6a249ffa438
--- /dev/null
+++ b/dbms/src/IO/tests/compressed_buffer.cpp
@@ -0,0 +1,112 @@
+#include <string>
+
+#include <iostream>
+#include <sstream>
+#include <fstream>
+
+#include <Poco/Stopwatch.h>
+
+#include <DB/Core/Types.h>
+#include <DB/IO/WriteBufferFromOStream.h>
+#include <DB/IO/ReadBufferFromIStream.h>
+#include <DB/IO/CompressedWriteBuffer.h>
+#include <DB/IO/CompressedReadBuffer.h>
+#include <DB/IO/WriteHelpers.h>
+#include <DB/IO/ReadHelpers.h>
+#include <DB/IO/CompressedInputStream.h>
+#include <DB/IO/CompressedOutputStream.h>
+
+
+int main(int argc, char ** argv)
+{
+	try
+	{
+		size_t n = 10000000;
+		Poco::Stopwatch stopwatch;
+	
+		{
+			std::ofstream ostr("test1");
+			DB::WriteBufferFromOStream buf(ostr);
+			DB::CompressedWriteBuffer compressed_buf(buf);
+
+			stopwatch.restart();
+			for (size_t i = 0; i < n; ++i)
+			{
+				DB::writeIntText(i, compressed_buf);
+				DB::writeChar('\t', compressed_buf);
+			}
+			stopwatch.stop();
+			std::cout << "Writing done (1). Elapsed: " << static_cast<double>(stopwatch.elapsed()) / 1000000 << std::endl;
+		}
+
+		{
+			std::ofstream ostr("test2");
+			DB::CompressedOutputStream compressed_ostr(ostr);
+			DB::WriteBufferFromOStream compressed_buf(compressed_ostr);
+
+			stopwatch.restart();
+			for (size_t i = 0; i < n; ++i)
+			{
+				DB::writeIntText(i, compressed_buf);
+				DB::writeChar('\t', compressed_buf);
+			}
+			stopwatch.stop();
+			std::cout << "Writing done (2). Elapsed: " << static_cast<double>(stopwatch.elapsed()) / 1000000 << std::endl;
+		}
+
+		{
+			std::ifstream istr("test1");
+			DB::ReadBufferFromIStream buf(istr);
+			DB::CompressedReadBuffer compressed_buf(buf);
+			std::string s;
+
+			stopwatch.restart();
+			for (size_t i = 0; i < n; ++i)
+			{
+				size_t x;
+				DB::readIntText(x, compressed_buf);
+				compressed_buf.ignore();
+				
+				if (x != i)
+				{
+					std::stringstream s;
+					s << "Failed!, read: " << x << ", expected: " << i;
+					throw DB::Exception(s.str());
+				}
+			}
+			stopwatch.stop();
+			std::cout << "Reading done (1). Elapsed: " << static_cast<double>(stopwatch.elapsed()) / 1000000 << std::endl;
+		}
+
+		{
+			std::ifstream istr("test2");
+			DB::CompressedInputStream compressed_istr(istr);
+			DB::ReadBufferFromIStream compressed_buf(compressed_istr);
+			std::string s;
+
+			stopwatch.restart();
+			for (size_t i = 0; i < n; ++i)
+			{
+				size_t x;
+				DB::readIntText(x, compressed_buf);
+				compressed_buf.ignore();
+				
+				if (x != i)
+				{
+					std::stringstream s;
+					s << "Failed!, read: " << x << ", expected: " << i;
+					throw DB::Exception(s.str());
+				}
+			}
+			stopwatch.stop();
+			std::cout << "Reading done (2). Elapsed: " << static_cast<double>(stopwatch.elapsed()) / 1000000 << std::endl;
+		}
+	}
+	catch (const DB::Exception & e)
+	{
+		std::cerr << e.what() << ", " << e.message() << std::endl;
+		return 1;
+	}
+
+	return 0;
+}
diff --git a/utils/compressor/test.sh b/utils/compressor/test.sh
index 117c90a4919..672ba0dc180 100755
--- a/utils/compressor/test.sh
+++ b/utils/compressor/test.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
 
-./compressor < compressor > compressor.snp
-./compressor -d < compressor.snp > compressor2
+./compressor < compressor > compressor.qlz
+./compressor -d < compressor.qlz > compressor2
 cmp compressor compressor2 && echo "Ok." || echo "Fail."