1 files changed, 120 insertions, 0 deletions
diff --git a/zen/dll.h b/zen/dll.h
new file mode 100644
index 00000000..302a3ac8
--- /dev/null
+++ b/zen/dll.h
@@ -0,0 +1,120 @@
+// **************************************************************************
+// * This file is part of the FreeFileSync project. It is distributed under *
+// * GNU General Public License: http://www.gnu.org/licenses/gpl.html       *
+// * Copyright (C) 2008-2011 ZenJu (zhnmju123 AT gmx.de)                    *
+// **************************************************************************
+
+#ifndef DLLLOADER_H_INCLUDED
+#define DLLLOADER_H_INCLUDED
+
+#include <memory>
+#include <string>
+#include "scope_guard.h"
+#include "win.h" //includes "windows.h"
+
+namespace zen
+{
+/*
+Manage DLL function and library ownership
+   - thread safety: like built-in type
+   - full value semantics
+
+ Usage:
+      typedef BOOL (WINAPI *IsWow64ProcessFun)(HANDLE hProcess, PBOOL Wow64Process);
+      const zen::DllFun<IsWow64ProcessFun> isWow64Process(L"kernel32.dll", "IsWow64Process");
+      if (isWow64Process) ... use function ptr ...
+*/
+
+template <class Func>
+class DllFun
+{
+public:
+    DllFun() : fun(NULL) {}
+
+    DllFun(const wchar_t* libraryName, const char* functionName) :
+        hLibRef(new HMODULE(::LoadLibrary(libraryName)), deleter),
+        fun(*hLibRef ? reinterpret_cast<Func>(::GetProcAddress(*hLibRef, functionName)) : NULL) {}
+
+    operator Func() const { return fun; }
+
+private:
+    static void deleter(HMODULE* ptr) { if (*ptr) ::FreeLibrary(*ptr); delete ptr; }
+
+    std::shared_ptr<const HMODULE> hLibRef;
+    Func fun;
+};
+
+//if the dll is already part of the process space, e.g. "kernel32.dll" or "shell32.dll", we can use a faster variant:
+//NOTE: since the lifetime of the referenced library is *not* controlled, this is safe to use only for permanently loaded libraries like these!
+template <class Func>
+class SysDllFun
+{
+public:
+    SysDllFun() : fun(NULL) {}
+
+    SysDllFun(const wchar_t* systemLibrary, const char* functionName) :
+        fun(reinterpret_cast<Func>(::GetProcAddress(::GetModuleHandle(systemLibrary), functionName))) {}
+
+    operator Func() const { return fun; }
+
+private:
+    Func fun;
+};
+
+
+/*
+extract binary resources from .exe/.dll:
+
+-- resource.h --
+#define MY_BINARY_RESOURCE 1337
+
+-- resource.rc --
+MY_BINARY_RESOURCE RCDATA "filename.dat"
+*/
+std::string getResourceStream(const std::wstring& libraryName, size_t resourceId);
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+//---------------Inline Implementation---------------------------------------------------
+inline
+std::string getResourceStream(const wchar_t* libraryName, size_t resourceId)
+{
+    std::string output;
+    HMODULE module = ::LoadLibrary(libraryName);
+    if (module)
+    {
+        ZEN_ON_BLOCK_EXIT(::FreeLibrary(module));
+
+        const HRSRC res = ::FindResource(module, MAKEINTRESOURCE(resourceId), RT_RCDATA);
+        if (res != NULL)
+        {
+            const HGLOBAL resHandle = ::LoadResource(module, res);
+            if (resHandle != NULL)
+            {
+                const char* stream = static_cast<const char*>(::LockResource(resHandle));
+                if (stream)
+                {
+                    const DWORD streamSize = ::SizeofResource(module, res);
+                    output.assign(stream, streamSize);
+                }
+            }
+        }
+    }
+    return output;
+}
+}
+
+#endif // DLLLOADER_H_INCLUDED