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diff --git a/tools/pe_bliss/entropy.h b/tools/pe_bliss/entropy.h
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+/*************************************************************************/
+/* Copyright (c) 2015 dx, http://kaimi.ru                                */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person           */
+/* obtaining a copy of this software and associated documentation        */
+/* files (the "Software"), to deal in the Software without               */
+/* restriction, including without limitation the rights to use,          */
+/* copy, modify, merge, publish, distribute, sublicense, and/or          */
+/* sell copies of the Software, and to permit persons to whom the        */
+/* Software is furnished to do so, subject to the following conditions:  */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+#pragma once
+#include <istream>
+#include "pe_base.h"
+
+namespace pe_bliss
+{
+class entropy_calculator
+{
+public:
+	//Calculates entropy for PE image section
+	static double calculate_entropy(const section& s);
+
+	//Calculates entropy for istream (from current position of stream)
+	static double calculate_entropy(std::istream& file);
+
+	//Calculates entropy for data block
+	static double calculate_entropy(const char* data, size_t length);
+
+	//Calculates entropy for this PE file (only section data)
+	static double calculate_entropy(const pe_base& pe);
+
+private:
+	entropy_calculator();
+	entropy_calculator(const entropy_calculator&);
+	entropy_calculator& operator=(const entropy_calculator&);
+
+	//Calculates entropy from bytes count
+	static double calculate_entropy(const uint32_t byte_count[256], std::streamoff total_length);
+};
+}