dsound wrapper dll

dsound.c

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

#define enum_dsound(_helper) \
	_helper(DirectSoundCreate) \
	_helper(DirectSoundEnumerateA) \
	_helper(DirectSoundEnumerateW) \
	_helper(DllCanUnloadNow) \
	_helper(DllGetClassObject) \
	_helper(DirectSoundCaptureCreate) \
	_helper(DirectSoundCaptureEnumerateA) \
	_helper(DirectSoundCaptureEnumerateW) \
	_helper(GetDeviceID) \
	_helper(DirectSoundFullDuplexCreate) \
	_helper(DirectSoundCreate8) \
	_helper(DirectSoundCaptureCreate8)

#define x(y) static FARPROC fp##y;
enum_dsound(x)
#undef x

#define x(y) __declspec(naked) void y(void){_asm{jmp fp##y}}
enum_dsound(x)
#undef x

static HMODULE dsound;

BOOL APIENTRY DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) {
	if (fdwReason == DLL_PROCESS_ATTACH) {
		wchar_t origpath[MAX_PATH];
		GetSystemDirectory(origpath, MAX_PATH);
		wcscat_s(origpath, MAX_PATH, L"\\dsound.dll");
		dsound = LoadLibrary(origpath);
		if (!dsound) return FALSE;
#define x(y) fp##y = GetProcAddress(dsound,#y);
		enum_dsound(x)
#undef x
		/* Payload goes here */
	}
	else if (fdwReason == DLL_PROCESS_DETACH) {
		FreeLibrary(dsound);
	}
	return TRUE;
}

dsound.def

LIBRARY "dsound"
EXPORTS
	DirectSoundCreate				@1
	DirectSoundEnumerateA			@2
	DirectSoundEnumerateW			@3
	DllCanUnloadNow					@4 PRIVATE
	DllGetClassObject				@5 PRIVATE
	DirectSoundCaptureCreate		@6
	DirectSoundCaptureEnumerateA	@7
	DirectSoundCaptureEnumerateW	@8
	GetDeviceID						@9
	DirectSoundFullDuplexCreate		@10
	DirectSoundCreate8				@11
	DirectSoundCaptureCreate8		@12