1 files changed, 26 insertions, 0 deletions
diff --git a/libqpdf/QUtil.cc b/libqpdf/QUtil.cc
index 0ffc6e26..3ac467d4 100644
--- a/libqpdf/QUtil.cc
+++ b/libqpdf/QUtil.cc
@@ -141,6 +141,32 @@ QUtil::get_env(std::string const& var, std::string* value)
 #endif
 }
 
+time_t
+QUtil::get_current_time()
+{
+#ifdef _WIN32
+    // The procedure to get local time at this resolution comes from
+    // the Microsoft documentation.  It says to convert a SYSTEMTIME
+    // to a FILETIME, and to copy the FILETIME to a ULARGE_INTEGER.
+    // The resulting number is the number of 100-nanosecond intervals
+    // between January 1, 1601 and now.  POSIX threads wants a time
+    // based on January 1, 1970, so we adjust by subtracting the
+    // number of seconds in that time period from the result we get
+    // here.
+    SYSTEMTIME sysnow;
+    GetSystemTime(&sysnow);
+    FILETIME filenow;
+    SystemTimeToFileTime(&sysnow, &filenow);
+    ULARGE_INTEGER uinow;
+    uinow.LowPart = filenow.dwLowDateTime;
+    uinow.HighPart = filenow.dwHighDateTime;
+    ULONGLONG now = uinow.QuadPart;
+    return ((now / 10000000LL) - 11644473600LL);
+#else
+    return time(0);
+#endif
+}
+
 std::string
 QUtil::toUTF8(unsigned long uval)
 {