OrcLib: TypeTraits: add TimeUtc<> strong type

src/OrcLib/CMakeLists.txt

@@ -577,6 +577,7 @@ set(SRC_INOUT_TEXT_FMT
     "Output/Text/Fmt/PartitionFlags.h"
     "Output/Text/Fmt/PartitionType.h"
     "Output/Text/Fmt/SYSTEMTIME.h"
+    "Output/Text/Fmt/TimeUtc.h"
     "Output/Text/Fmt/Fwd/ByteQuantity.h"
     "Output/Text/Fmt/Fwd/CryptoHashStreamAlgorithm.h"
     "Output/Text/Fmt/Fwd/error_code.h"
@@ -591,7 +592,8 @@ set(SRC_INOUT_TEXT_FMT
     "Output/Text/Fmt/Fwd/Partition.h"
     "Output/Text/Fmt/Fwd/PartitionFlags.h"
     "Output/Text/Fmt/Fwd/PartitionType.h"
-    "Output/Text/Fmt/Fwd/SYSTEMTIME.h")
+    "Output/Text/Fmt/Fwd/SYSTEMTIME.h"
+    "Output/Text/Fmt/Fwd/TimeUtc.h")
 
 source_group(In&Out\\Output\\Text\\Fmt FILES ${SRC_INOUT_TEXT_FMT})
 

src/OrcLib/Output/Text/Fmt/Formatter.h

@@ -25,3 +25,4 @@
 #include "Output/Text/Fmt/Fwd/PartitionType.h"
 #include "Output/Text/Fmt/Fwd/PartitionFlags.h"
 #include "Output/Text/Fmt/Fwd/SYSTEMTIME.h"
+#include "Output/Text/Fmt/Fwd/TimeUtc.h"

src/OrcLib/Output/Text/Fmt/Fwd/TimeUtc.h

@@ -0,0 +1,36 @@
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+//
+// Copyright © 2020 ANSSI. All Rights Reserved.
+//
+// Author(s): fabienfl (ANSSI)
+//
+
+#pragma once
+
+#include <string_view>
+
+#include <fmt/format.h>
+
+namespace Orc {
+namespace Traits {
+
+template <typename T>
+struct TimeUtc;
+
+}  // namespace Traits
+}  // namespace Orc
+
+template <typename T>
+struct fmt::formatter<Orc::Traits::TimeUtc<T>> : public fmt::formatter<std::string_view>
+{
+    template <typename FormatContext>
+    auto format(const Orc::Traits::TimeUtc<T>& time, FormatContext& ctx) -> decltype(ctx.out());
+};
+
+template <typename T>
+struct fmt::formatter<Orc::Traits::TimeUtc<T>, wchar_t> : public fmt::formatter<std::wstring_view, wchar_t>
+{
+    template <typename FormatContext>
+    auto format(const Orc::Traits::TimeUtc<T>& time, FormatContext& ctx) -> decltype(ctx.out());
+};

src/OrcLib/Output/Text/Fmt/TimeUtc.h

@@ -0,0 +1,69 @@
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+//
+// Copyright © 2020 ANSSI. All Rights Reserved.
+//
+// Author(s): fabienfl (ANSSI)
+//
+
+#pragma once
+
+#include "Output/Text/Fmt/Fwd/TimeUtc.h"
+
+#include <array>
+#include <string>
+
+#include <windows.h>
+
+#include "Utils/TypeTraits.h"
+#include "Output/Text/Fmt/Fwd/SYSTEMTIME.h"
+
+namespace Orc {
+namespace Text {
+
+inline auto FormatSystemTimeUtcA(const SYSTEMTIME& st)
+{
+    return fmt::format(
+        "{}-{:02}-{:02}T{:02}:{:02}:{:02}.{:03}Z",
+        st.wYear,
+        st.wMonth,
+        st.wDay,
+        st.wHour,
+        st.wMinute,
+        st.wSecond,
+        st.wMilliseconds);
+}
+
+inline auto FormatSystemTimeUtcW(const SYSTEMTIME& st)
+{
+    return fmt::format(
+        L"{}-{:02}-{:02}T{:02}:{:02}:{:02}.{:03}Z",
+        st.wYear,
+        st.wMonth,
+        st.wDay,
+        st.wHour,
+        st.wMinute,
+        st.wSecond,
+        st.wMilliseconds);
+}
+
+}  // namespace Text
+}  // namespace Orc
+
+template <typename T>
+template <typename FormatContext>
+auto fmt::formatter<Orc::Traits::TimeUtc<T>>::format(const Orc::Traits::TimeUtc<T>& time, FormatContext& ctx)
+    -> decltype(ctx.out())
+{
+    std::string s = Orc::Text::FormatSystemTimeUtcA(time);
+    return formatter<std::string_view>::format(s, ctx);
+}
+
+template <typename T>
+template <typename FormatContext>
+auto fmt::formatter<Orc::Traits::TimeUtc<T>, wchar_t>::format(const Orc::Traits::TimeUtc<T>& time, FormatContext& ctx)
+    -> decltype(ctx.out())
+{
+    std::wstring s = Orc::Text::FormatSystemTimeUtcW(time);
+    return formatter<std::wstring_view, wchar_t>::format(s, ctx);
+}

src/OrcLib/Utils/TypeTraits.h

@@ -386,5 +386,23 @@ struct Offset
     T value;
 };
 
+//
+// Strong type for UTC time
+//
+template <class T>
+struct TimeUtc
+{
+    using value_type = T;
+
+    TimeUtc(T quantity)
+        : value(quantity)
+    {
+    }
+
+    operator T&() { return value; }
+    operator T() const { return value; }
+    T value;
+};
+
 }  // namespace Traits
 }  // namespace Orc