added windows version of vpcd driver

based on Fabio Ottavi's UMDF Driver for a Virtual Smart Card Reader, see
http://www.codeproject.com/Articles/134010/An-UMDF-Driver-for-a-Virtual-Smart-Card-Reader

virtualsmartcard/win32/vpcd/memory.cpp

@@ -0,0 +1,103 @@
+#include "memory.h"
+
+bool getBuffer(IWDFIoRequest *pRequest, BYTE **buffer, SIZE_T *bufferLen)
+{
+	IWDFMemory *inmem=NULL;
+
+	if (!pRequest || !buffer || !bufferLen) {
+		OutputDebugString(L"wrong arguments");
+		return false;
+	}
+
+	pRequest->GetInputMemory(&inmem);
+	if (inmem==NULL) {
+		OutputDebugString(L"GetInputMemory failed");
+		return false;
+	} else {
+		SIZE_T size;
+		void *data=inmem->GetDataBuffer(&size);
+		if (*bufferLen < size) {
+			BYTE *p = (BYTE *) realloc(*buffer, size);
+			if (!p) {
+				OutputDebugString(L"realloc failed");
+				inmem->Release();
+				return false;
+			}
+			*buffer = p;
+		}
+
+		memcpy(*buffer, data, size);
+		(*bufferLen) = size;
+
+		inmem->Release();
+		return true;
+	}
+}
+
+void completeWithBuffer(IWDFIoRequest* pRequest,BYTE *result,int inSize) {
+	IWDFMemory *outmem=NULL;
+	pRequest->GetOutputMemory (&outmem);
+	if (outmem==NULL) {
+		OutputDebugString(L"GetOutputMemory failed");
+        pRequest->Complete(HRESULT_FROM_WIN32(ERROR_GEN_FAILURE));
+	}
+	else {
+		outmem->CopyFromBuffer(0,result,inSize);
+		outmem->Release();
+        pRequest->CompleteWithInformation(0,(SIZE_T)inSize);
+	}
+}
+
+void completeWithString(IWDFIoRequest* pRequest,char *result,int outSize) {
+	IWDFMemory *outmem=NULL;
+	pRequest->GetOutputMemory (&outmem);
+	if (outmem==NULL) {
+		OutputDebugString(L"GetOutputMemory failed");
+        pRequest->Complete(HRESULT_FROM_WIN32(ERROR_GEN_FAILURE));
+	}
+	else {
+		int size=min(outSize,(int)strlen(result)+1);
+		outmem->CopyFromBuffer(0,result,size);
+		outmem->Release();
+        pRequest->CompleteWithInformation(0,(SIZE_T)size);
+	}
+}
+void completeWithInteger(IWDFIoRequest* pRequest,DWORD result) {
+	IWDFMemory *outmem=NULL;
+	pRequest->GetOutputMemory (&outmem);
+	if (outmem==NULL) {
+		OutputDebugString(L"GetOutputMemory failed");
+        pRequest->Complete(HRESULT_FROM_WIN32(ERROR_GEN_FAILURE));
+	}
+	else {
+		outmem->CopyFromBuffer(0,&result,sizeof(result));
+		outmem->Release();
+        pRequest->CompleteWithInformation(0,sizeof(result));
+	}
+}
+
+bool getInteger(IWDFIoRequest *pRequest, DWORD *integer)
+{
+	IWDFMemory *inmem=NULL;
+
+	if (!pRequest || !integer) {
+		OutputDebugString(L"wrong arguments");
+		return false;
+	}
+
+	pRequest->GetInputMemory(&inmem);
+	if (inmem==NULL) {
+		OutputDebugString(L"GetInputMemory failed");
+		return false;
+	} else {
+		SIZE_T size;
+		void *data=inmem->GetDataBuffer(&size);
+		if (size != sizeof(*integer)) {
+			OutputDebugString(L"not enough memory failed");
+			return false;
+		}
+		*integer=*(DWORD *)data;
+		inmem->Release();
+		return true;
+	}
+}