Add Win32FileTimeConverter (#3941)

Azure · Sep 21, 2022 · 14e4f52 · 14e4f52
1 parent b809bf9
commit 14e4f52
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Showing 2 changed files with 87 additions and 1 deletion.
diff --git a/sdk/core/azure-core/inc/azure/core/datetime.hpp b/sdk/core/azure-core/inc/azure/core/datetime.hpp
@@ -269,7 +269,7 @@ inline bool operator>=(std::chrono::system_clock::time_point const& tp, DateTime
 
 namespace Core { namespace _internal {
   /**
-   * @brief Provides convertion methods for POSIX time to an #Azure::DateTime.
+   * @brief Provides conversion methods for POSIX time to an #Azure::DateTime.
    *
    */
   class PosixTimeConverter final {
@@ -311,6 +311,51 @@ namespace Core { namespace _internal {
      */
     ~PosixTimeConverter() = delete;
   };
+
+  /**
+   * @brief Provides conversion methods for Win32 FILETIME to an #Azure::DateTime.
+   *
+   */
+  class Win32FileTimeConverter final {
+  public:
+    /**
+     * @brief Converts Win32 FILETIME to an #Azure::DateTime.
+     *
+     * @param win32Filetime The number of 100-nanoseconds since 1601-01-01.
+     * @return Calculated #Azure::DateTime.
+     */
+    static DateTime Win32FileTimeToDateTime(int64_t win32Filetime)
+    {
+      auto t = DateTime(1601) + Azure::_detail::Clock::duration(win32Filetime);
+      return DateTime(t);
+    }
+
+    /**
+     * @brief Converts a DateTime to Win32 FILETIME.
+     *
+     * @param dateTime The `%DateTime` to convert.
+     * @return The number of 100-nanoseconds since 1601-01-01.
+     */
+    static int64_t DateTimeToWin32FileTime(DateTime const& dateTime)
+    {
+      return std::chrono::duration_cast<Azure::_detail::Clock::duration>(dateTime - DateTime(1601))
+          .count();
+    }
+
+  private:
+    /**
+     * @brief An instance of `%Win32FileTimeConverter` class cannot be created.
+     *
+     */
+    Win32FileTimeConverter() = delete;
+
+    /**
+     * @brief An instance of `%Win32FileTimeConverter` class cannot be destructed, because no
+     * instance can be created.
+     *
+     */
+    ~Win32FileTimeConverter() = delete;
+  };
 }} // namespace Core::_internal
 
 } // namespace Azure
diff --git a/sdk/core/azure-core/test/ut/datetime_test.cpp b/sdk/core/azure-core/test/ut/datetime_test.cpp
@@ -895,3 +895,44 @@ TEST(DateTime, LeapYear)
   EXPECT_NO_THROW(static_cast<void>(DateTime(2021, 2, 28)));
   EXPECT_THROW(static_cast<void>(DateTime(2021, 2, 29)), std::invalid_argument);
 }
+
+TEST(DateTime, Win32FileTimeConverter)
+{
+  using namespace Azure::Core::_internal;
+
+  EXPECT_EQ(
+      Win32FileTimeConverter::DateTimeToWin32FileTime(
+          Win32FileTimeConverter::Win32FileTimeToDateTime(0)),
+      0);
+  EXPECT_EQ(
+      Win32FileTimeConverter::DateTimeToWin32FileTime(
+          Win32FileTimeConverter::Win32FileTimeToDateTime(1)),
+      1);
+  EXPECT_EQ(
+      Win32FileTimeConverter::DateTimeToWin32FileTime(
+          Win32FileTimeConverter::Win32FileTimeToDateTime(133080315699856412)),
+      133080315699856412);
+  EXPECT_EQ(
+      Win32FileTimeConverter::DateTimeToWin32FileTime(
+          Win32FileTimeConverter::Win32FileTimeToDateTime(2650467743995784569)),
+      2650467743995784569);
+
+  EXPECT_EQ(
+      Win32FileTimeConverter::Win32FileTimeToDateTime(0).ToString(
+          Azure::DateTime::DateFormat::Rfc3339, Azure::DateTime::TimeFractionFormat::AllDigits),
+      "1601-01-01T00:00:00.0000000Z");
+  EXPECT_EQ(
+      Win32FileTimeConverter::Win32FileTimeToDateTime(1).ToString(
+          Azure::DateTime::DateFormat::Rfc3339, Azure::DateTime::TimeFractionFormat::AllDigits),
+      "1601-01-01T00:00:00.0000001Z");
+  EXPECT_EQ(
+      Win32FileTimeConverter::Win32FileTimeToDateTime(133080315699856412)
+          .ToString(
+              Azure::DateTime::DateFormat::Rfc3339, Azure::DateTime::TimeFractionFormat::AllDigits),
+      "2022-09-19T03:26:09.9856412Z");
+  EXPECT_EQ(
+      Win32FileTimeConverter::Win32FileTimeToDateTime(2650467743995784569)
+          .ToString(
+              Azure::DateTime::DateFormat::Rfc3339, Azure::DateTime::TimeFractionFormat::AllDigits),
+      "9999-12-31T23:59:59.5784569Z");
+}