Add missing MiscUtils.cpp

library/MiscUtils.cpp

@@ -0,0 +1,74 @@
+/*
+https://github.com/peterix/dfhack
+Copyright (c) 2009-2011 Petr Mrázek (peterix@gmail.com)
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any
+damages arising from the use of this software.
+
+Permission is granted to anyone to use this software for any
+purpose, including commercial applications, and to alter it and
+redistribute it freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must
+not claim that you wrote the original software. If you use this
+software in a product, an acknowledgment in the product documentation
+would be appreciated but is not required.
+
+2. Altered source versions must be plainly marked as such, and
+must not be misrepresented as being the original software.
+
+3. This notice may not be removed or altered from any source
+distribution.
+*/
+
+#include "Internal.h"
+#include "Export.h"
+#include "Core.h"
+#include "MiscUtils.h"
+
+
+
+#ifndef LINUX_BUILD
+    #include <Windows.h>
+#else
+    #include <sys/time.h>
+    #include <ctime>
+#endif
+
+#ifdef LINUX_BUILD // Linux
+uint64_t GetTimeMs64()
+{
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    uint64_t ret = tv.tv_usec;
+
+    // Convert from micro seconds (10^-6) to milliseconds (10^-3)
+    ret /= 1000;
+    // Adds the seconds (10^0) after converting them to milliseconds (10^-3)
+    ret += (tv.tv_sec * 1000);
+    return ret;
+}
+
+
+#else // Windows
+uint64_t GetTimeMs64()
+{
+    FILETIME ft;
+    LARGE_INTEGER li;
+
+    // Get the amount of 100 nano seconds intervals elapsed since January 1, 1601 (UTC)
+    // and copy it to a LARGE_INTEGER structure.
+    GetSystemTimeAsFileTime(&ft);
+    li.LowPart = ft.dwLowDateTime;
+    li.HighPart = ft.dwHighDateTime;
+
+    uint64_t ret = li.QuadPart;
+    // Convert from file time to UNIX epoch time.
+    ret -= 116444736000000000LL;
+    // From 100 nano seconds (10^-7) to 1 millisecond (10^-3) intervals
+    ret /= 10000;
+
+    return ret;
+}
+#endif