diff -r ea891871f481 -r bb5522e88ab2 misc/libphysfs/lzma/CPP/Windows/MemoryLock.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libphysfs/lzma/CPP/Windows/MemoryLock.cpp	Mon Apr 10 12:06:43 2017 -0400
@@ -0,0 +1,78 @@
+// Common/MemoryLock.cpp
+
+#include "StdAfx.h"
+
+namespace NWindows {
+namespace NSecurity {
+
+#ifndef _UNICODE
+typedef BOOL (WINAPI * OpenProcessTokenP)(HANDLE ProcessHandle, DWORD DesiredAccess, PHANDLE TokenHandle);
+typedef BOOL (WINAPI * LookupPrivilegeValueP)(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID  lpLuid);
+typedef BOOL (WINAPI * AdjustTokenPrivilegesP)(HANDLE TokenHandle, BOOL DisableAllPrivileges,
+    PTOKEN_PRIVILEGES NewState, DWORD BufferLength, PTOKEN_PRIVILEGES PreviousState,PDWORD ReturnLength);
+#endif
+
+#ifdef _UNICODE
+bool EnableLockMemoryPrivilege(
+#else
+static bool EnableLockMemoryPrivilege2(HMODULE hModule,
+#endif
+bool enable)
+{
+  #ifndef _UNICODE
+  if (hModule == NULL)
+    return false;
+  OpenProcessTokenP openProcessToken = (OpenProcessTokenP)GetProcAddress(hModule, "OpenProcessToken");
+  LookupPrivilegeValueP lookupPrivilegeValue = (LookupPrivilegeValueP)GetProcAddress(hModule, "LookupPrivilegeValueA" );
+  AdjustTokenPrivilegesP adjustTokenPrivileges = (AdjustTokenPrivilegesP)GetProcAddress(hModule, "AdjustTokenPrivileges");
+  if (openProcessToken == NULL || adjustTokenPrivileges == NULL || lookupPrivilegeValue == NULL)
+    return false;
+  #endif
+
+  HANDLE token;
+  if (!
+    #ifdef _UNICODE
+    ::OpenProcessToken
+    #else
+    openProcessToken
+    #endif
+    (::GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES, &token))
+    return false;
+  TOKEN_PRIVILEGES tp;
+  bool res = false;
+  if (
+    #ifdef _UNICODE
+    ::LookupPrivilegeValue
+    #else
+    lookupPrivilegeValue
+    #endif
+    (NULL, SE_LOCK_MEMORY_NAME, &(tp.Privileges[0].Luid)))
+  {
+    tp.PrivilegeCount = 1;
+    tp.Privileges[0].Attributes = enable ? SE_PRIVILEGE_ENABLED: 0;
+    if (
+      #ifdef _UNICODE
+      ::AdjustTokenPrivileges
+      #else
+      adjustTokenPrivileges
+      #endif
+      (token, FALSE, &tp, 0, NULL, NULL))
+      res = (GetLastError() == ERROR_SUCCESS);
+  }
+  ::CloseHandle(token);
+  return res;
+}
+
+#ifndef _UNICODE
+bool EnableLockMemoryPrivilege(bool enable)
+{
+  HMODULE hModule = LoadLibrary(TEXT("Advapi32.dll"));
+  if(hModule == NULL)
+    return false;
+  bool res = EnableLockMemoryPrivilege2(hModule, enable);
+  ::FreeLibrary(hModule);
+  return res;
+}
+#endif
+
+}}