logic: fixed application crash on windows if JVM tries to allocate too much memory by reducing the amount of allocated memory to the available size.

src/lib/utility/utilityWindows.cpp

@@ -0,0 +1,46 @@
+#include "utility/utilityWindows.h"
+
+#ifdef WIN32
+
+#include <Windows.h>
+
+unsigned long utility::getLargestByteSizeOfAllocatableMemory()
+{
+	MEMORY_BASIC_INFORMATION mbi;
+	unsigned long start = 0;
+	bool recording = false;
+	unsigned long freestart = 0, largestFreestart = 0;
+	__int64 free = 0, largestFree = 0;
+
+	while (true)
+	{
+		SIZE_T s = VirtualQuery((LPCVOID)start, &mbi, sizeof(mbi));
+		if (s != sizeof(mbi)) break;
+
+		if (mbi.State == MEM_FREE)
+		{
+			if (!recording) freestart = start;
+
+			free += mbi.RegionSize;
+			recording = true;
+		}
+		else
+		{
+			if (recording)
+			{
+				if (free > largestFree)
+				{
+					largestFree = free;
+					largestFreestart = freestart;
+				}
+			}
+			free = 0;
+			recording = false;
+		}
+		start += mbi.RegionSize;
+	}
+
+	return largestFree;
+}
+
+#endif // WIN32