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diff --git a/libdevcore/CommonIO.h b/libdevcore/CommonIO.h
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+++ b/libdevcore/CommonIO.h
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+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	cpp-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file CommonIO.h
+ * @author Gav Wood <i@gavwood.com>
+ * @date 2014
+ *
+ * File & stream I/O routines.
+ */
+
+#pragma once
+
+#include <sstream>
+#include <string>
+#include "Common.h"
+
+namespace dev
+{
+
+/// Retrieve and returns the contents of the given file as a std::string.
+/// If the file doesn't exist or isn't readable, returns an empty container / bytes.
+std::string contentsString(std::string const& _file);
+
+/// Write the given binary data into the given file, replacing the file if it pre-exists.
+/// Throws exception on error.
+/// @param _writeDeleteRename useful not to lose any data: If set, first writes to another file in
+/// the same directory and then moves that file.
+void writeFile(std::string const& _file, bytesConstRef _data, bool _writeDeleteRename = false);
+/// Write the given binary data into the given file, replacing the file if it pre-exists.
+inline void writeFile(std::string const& _file, bytes const& _data, bool _writeDeleteRename = false) { writeFile(_file, bytesConstRef(&_data), _writeDeleteRename); }
+inline void writeFile(std::string const& _file, std::string const& _data, bool _writeDeleteRename = false) { writeFile(_file, bytesConstRef(_data), _writeDeleteRename); }
+/// Converts arbitrary value to string representation using std::stringstream.
+template <class _T>
+std::string toString(_T const& _t)
+{
+	std::ostringstream o;
+	o << _t;
+	return o.str();
+}
+
+}