Initial community commit

1 files changed, 175 insertions, 0 deletions

diff --git a/Src/devices/deviceObjectEnum.cpp b/Src/devices/deviceObjectEnum.cpp
new file mode 100644
index 00000000..e60b39d6
--- /dev/null
+++ b/Src/devices/deviceObjectEnum.cpp
@@ -0,0 +1,175 @@
+#include "main.h"
+#include "./deviceObjectEnum.h"
+#include <new>
+
+DeviceObjectEnum::DeviceObjectEnum() 
+	: ref(1), buffer(NULL), size(0), cursor(0)
+{
+}
+
+DeviceObjectEnum::~DeviceObjectEnum()
+{
+	if (NULL != buffer)
+	{
+		while(size--)
+		{
+			buffer[size]->Release();
+		}
+	}
+}
+
+HRESULT DeviceObjectEnum::CreateInstance(ifc_deviceobject **objects, 
+										size_t count, 
+										DeviceObjectEnum **instance)
+{
+	size_t index, size;
+	void *storage;
+	ifc_deviceobject *o;
+	DeviceObjectEnum *enumerator;
+	
+
+	if (NULL == instance) 
+		return E_POINTER;
+
+	*instance = NULL;
+
+	size = sizeof(DeviceObjectEnum) + (sizeof(ifc_deviceobject**) * count);
+	storage = calloc(1, size);
+	if (NULL == storage)
+		return E_OUTOFMEMORY;
+	
+	enumerator = new(storage) DeviceObjectEnum();
+	if (NULL == enumerator)
+	{
+		free(storage);
+		return E_FAIL;
+	}
+
+	enumerator->buffer = (ifc_deviceobject**)(((BYTE*)enumerator) + sizeof(DeviceObjectEnum));
+	
+	for (index = 0; index < count; index++)
+	{
+		o = objects[index];
+		if (NULL != o)
+		{
+			enumerator->buffer[enumerator->size] = o;
+			o->AddRef();
+			enumerator->size++;
+		}
+	}
+
+	*instance = enumerator;
+	return S_OK;
+}
+
+
+
+size_t DeviceObjectEnum::AddRef()
+{
+	return InterlockedIncrement((LONG*)&ref);
+}
+
+size_t DeviceObjectEnum::Release()
+{
+	if (0 == ref)
+		return ref;
+	
+	LONG r = InterlockedDecrement((LONG*)&ref);
+	if (0 == r)
+		delete(this);
+	
+	return r;
+}
+
+int DeviceObjectEnum::QueryInterface(GUID interface_guid, void **object)
+{
+	if (NULL == object) return E_POINTER;
+	
+	if (IsEqualIID(interface_guid, IFC_DeviceObjectEnum))
+		*object = static_cast<ifc_deviceobjectenum*>(this);
+	else
+	{
+		*object = NULL;
+		return E_NOINTERFACE;
+	}
+
+	if (NULL == *object)
+		return E_UNEXPECTED;
+
+	AddRef();
+	return S_OK;
+}
+
+HRESULT DeviceObjectEnum::Next(ifc_deviceobject **objects, size_t bufferMax, size_t *fetched)
+{
+	size_t available, copied, index;
+	ifc_deviceobject **source;
+
+	if (NULL == objects)
+		return E_POINTER;
+	
+	if (0 == bufferMax) 
+		return E_INVALIDARG;
+
+	if (cursor >= size)
+	{
+		if (NULL != fetched) 
+			*fetched = 0;
+
+		return S_FALSE;
+	}
+
+	available = size - cursor;
+	copied = ((available > bufferMax) ? bufferMax : available);
+	
+	source = buffer + cursor;
+	CopyMemory(objects, source, copied * sizeof(ifc_deviceobject*));
+    
+	for(index = 0; index < copied; index++)
+		objects[index]->AddRef();
+	
+	cursor += copied;
+
+	if (NULL != fetched) 
+		*fetched = copied;
+
+	return (bufferMax == copied) ? S_OK : S_FALSE;
+}
+
+HRESULT DeviceObjectEnum::Reset(void)
+{
+	cursor = 0;
+	return S_OK;
+}
+
+HRESULT DeviceObjectEnum::Skip(size_t count)
+{
+	cursor += count;
+	if (cursor > size)
+		cursor = size;
+	
+	return (cursor < size) ? S_OK : S_FALSE;
+}
+
+
+HRESULT DeviceObjectEnum::GetCount(size_t *count)
+{
+	if (NULL == count)
+		return E_POINTER;
+	
+	*count = size;
+
+	return S_OK;
+}
+
+#define CBCLASS DeviceObjectEnum
+START_DISPATCH;
+CB(ADDREF, AddRef)
+CB(RELEASE, Release)
+CB(QUERYINTERFACE, QueryInterface)
+CB(API_NEXT, Next)
+CB(API_RESET, Reset)
+CB(API_SKIP, Skip)
+CB(API_GETCOUNT, GetCount)
+END_DISPATCH;
+#undef CBCLASS
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