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+// Copyright 2012 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// \file utils/units.hpp
+/// Formatters and parsers of user-friendly units.
+
+#if !defined(UTILS_UNITS_HPP)
+#define UTILS_UNITS_HPP
+
+#include "utils/units_fwd.hpp"
+
+extern "C" {
+#include <stdint.h>
+}
+
+#include <istream>
+#include <ostream>
+#include <string>
+
+namespace utils {
+namespace units {
+
+
+namespace {
+
+/// Constant representing 1 kilobyte.
+const uint64_t KB = int64_t(1) << 10;
+
+/// Constant representing 1 megabyte.
+const uint64_t MB = int64_t(1) << 20;
+
+/// Constant representing 1 gigabyte.
+const uint64_t GB = int64_t(1) << 30;
+
+/// Constant representing 1 terabyte.
+const uint64_t TB = int64_t(1) << 40;
+
+}  // anonymous namespace
+
+
+/// Representation of a bytes quantity.
+///
+/// The purpose of this class is to represent an amount of bytes in a semantic
+/// manner, and to provide functions to format such numbers for nice user
+/// presentation and to parse back such numbers.
+///
+/// The input follows this regular expression: [0-9]+(|\.[0-9]+)[GgKkMmTt]?
+/// The output follows this regular expression: [0-9]+\.[0-9]{3}[GKMT]?
+class bytes {
+    /// Raw representation, in bytes, of the quantity.
+    uint64_t _count;
+
+public:
+    bytes(void);
+    explicit bytes(const uint64_t);
+
+    static bytes parse(const std::string&);
+    std::string format(void) const;
+
+    operator uint64_t(void) const;
+};
+
+
+std::istream& operator>>(std::istream&, bytes&);
+std::ostream& operator<<(std::ostream&, const bytes&);
+
+
+}  // namespace units
+}  // namespace utils
+
+#endif  // !defined(UTILS_UNITS_HPP)