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#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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