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ole32: Simplify stream creation, remove redundant comments.

This commit is contained in:
Nikolay Sivov 2011-12-13 00:43:24 +03:00 committed by Alexandre Julliard
parent 5f5d5e0c65
commit 5b533d82d2
1 changed files with 42 additions and 133 deletions
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175
dlls/ole32/hglobalstream.c
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@ -74,46 +74,6 @@ static inline HGLOBALStreamImpl *impl_from_IStream(IStream *iface)
return CONTAINING_RECORD(iface, HGLOBALStreamImpl, IStream_iface);
}
/***
* This is the destructor of the HGLOBALStreamImpl class.
*
* This method will clean-up all the resources used-up by the given HGLOBALStreamImpl
* class. The pointer passed-in to this function will be freed and will not
* be valid anymore.
*/
static void HGLOBALStreamImpl_Destroy(HGLOBALStreamImpl* This)
{
TRACE("(%p)\n", This);
/*
* Release the HGlobal if the constructor asked for that.
*/
if (This->deleteOnRelease)
{
GlobalFree(This->supportHandle);
This->supportHandle=0;
}
/*
* Finally, free the memory used-up by the class.
*/
HeapFree(GetProcessHeap(), 0, This);
}
/***
* This implements the IUnknown method AddRef for this
* class
*/
static ULONG WINAPI HGLOBALStreamImpl_AddRef(IStream* iface)
{
HGLOBALStreamImpl* This = impl_from_IStream(iface);
return InterlockedIncrement(&This->ref);
}
/***
* This implements the IUnknown method QueryInterface for this
* class
*/
static HRESULT WINAPI HGLOBALStreamImpl_QueryInterface(
IStream* iface,
REFIID riid, /* [in] */
@ -121,20 +81,11 @@ static HRESULT WINAPI HGLOBALStreamImpl_QueryInterface(
{
HGLOBALStreamImpl* This = impl_from_IStream(iface);
/*
* Perform a sanity check on the parameters.
*/
if (ppvObject==0)
return E_INVALIDARG;
/*
* Initialize the return parameter.
*/
*ppvObject = 0;
/*
* Compare the riid with the interface IDs implemented by this object.
*/
if (IsEqualIID(&IID_IUnknown, riid) ||
IsEqualIID(&IID_ISequentialStream, riid) ||
IsEqualIID(&IID_IStream, riid))
@ -142,25 +93,20 @@ static HRESULT WINAPI HGLOBALStreamImpl_QueryInterface(
*ppvObject = This;
}
/*
* Check that we obtained an interface.
*/
if ((*ppvObject)==0)
return E_NOINTERFACE;
/*
* Query Interface always increases the reference count by one when it is
* successful
*/
HGLOBALStreamImpl_AddRef(iface);
IStream_AddRef(iface);
return S_OK;
}
/***
* This implements the IUnknown method Release for this
* class
*/
static ULONG WINAPI HGLOBALStreamImpl_AddRef(IStream* iface)
{
HGLOBALStreamImpl* This = impl_from_IStream(iface);
return InterlockedIncrement(&This->ref);
}
static ULONG WINAPI HGLOBALStreamImpl_Release(
IStream* iface)
{
@ -168,7 +114,15 @@ static ULONG WINAPI HGLOBALStreamImpl_Release(
ULONG ref = InterlockedDecrement(&This->ref);
if (!ref)
HGLOBALStreamImpl_Destroy(This);
{
if (This->deleteOnRelease)
{
GlobalFree(This->supportHandle);
This->supportHandle = NULL;
}
HeapFree(GetProcessHeap(), 0, This);
}
return ref;
}
@ -598,14 +552,11 @@ static HRESULT WINAPI HGLOBALStreamImpl_Clone(
hr = CreateStreamOnHGlobal(This->supportHandle, FALSE, ppstm);
if(FAILED(hr))
return hr;
offset.QuadPart=(LONGLONG)This->currentPosition.QuadPart;
HGLOBALStreamImpl_Seek(*ppstm,offset,STREAM_SEEK_SET,&dummy);
offset.QuadPart = (LONGLONG)This->currentPosition.QuadPart;
IStream_Seek(*ppstm, offset, STREAM_SEEK_SET, &dummy);
return S_OK;
}
/*
* Virtual function table for the HGLOBALStreamImpl class.
*/
static const IStreamVtbl HGLOBALStreamImplVtbl =
{
HGLOBALStreamImpl_QueryInterface,
@ -624,62 +575,6 @@ static const IStreamVtbl HGLOBALStreamImplVtbl =
HGLOBALStreamImpl_Clone
};
/******************************************************************************
** HGLOBALStreamImpl implementation
*/
/***
* This is the constructor for the HGLOBALStreamImpl class.
*
* Params:
* hGlobal - Handle that will support the stream. can be NULL.
* fDeleteOnRelease - Flag set to TRUE if the HGLOBAL will be released
* when the IStream object is destroyed.
*/
static HGLOBALStreamImpl* HGLOBALStreamImpl_Construct(
HGLOBAL hGlobal,
BOOL fDeleteOnRelease)
{
HGLOBALStreamImpl* This;
This = HeapAlloc(GetProcessHeap(), 0, sizeof(HGLOBALStreamImpl));
if (This)
{
This->IStream_iface.lpVtbl = &HGLOBALStreamImplVtbl;
This->ref = 0;
/*
* Initialize the support.
*/
This->supportHandle = hGlobal;
This->deleteOnRelease = fDeleteOnRelease;
/*
* This method will allocate a handle if one is not supplied.
*/
if (!This->supportHandle)
{
This->supportHandle = GlobalAlloc(GMEM_MOVEABLE | GMEM_NODISCARD |
GMEM_SHARE, 0);
}
/*
* Start the stream at the beginning.
*/
This->currentPosition.u.HighPart = 0;
This->currentPosition.u.LowPart = 0;
/*
* Initialize the size of the stream to the size of the handle.
*/
This->streamSize.u.HighPart = 0;
This->streamSize.u.LowPart = GlobalSize(This->supportHandle);
}
return This;
}
/***********************************************************************
* CreateStreamOnHGlobal [OLE32.@]
*/
@ -688,22 +583,36 @@ HRESULT WINAPI CreateStreamOnHGlobal(
BOOL fDeleteOnRelease,
LPSTREAM* ppstm)
{
HGLOBALStreamImpl* newStream;
HGLOBALStreamImpl* This;
if (!ppstm)
return E_INVALIDARG;
newStream = HGLOBALStreamImpl_Construct(hGlobal,
fDeleteOnRelease);
This = HeapAlloc(GetProcessHeap(), 0, sizeof(HGLOBALStreamImpl));
if (!This) return E_OUTOFMEMORY;
if (newStream!=NULL)
{
return IUnknown_QueryInterface((IUnknown*)newStream,
&IID_IStream,
(void**)ppstm);
}
This->IStream_iface.lpVtbl = &HGLOBALStreamImplVtbl;
This->ref = 1;
return E_OUTOFMEMORY;
/* initialize the support */
This->supportHandle = hGlobal;
This->deleteOnRelease = fDeleteOnRelease;
/* allocate a handle if one is not supplied */
if (!This->supportHandle)
This->supportHandle = GlobalAlloc(GMEM_MOVEABLE|GMEM_NODISCARD|GMEM_SHARE, 0);
/* start at the beginning */
This->currentPosition.u.HighPart = 0;
This->currentPosition.u.LowPart = 0;
/* initialize the size of the stream to the size of the handle */
This->streamSize.u.HighPart = 0;
This->streamSize.u.LowPart = GlobalSize(This->supportHandle);
*ppstm = &This->IStream_iface;
return S_OK;
}
/***********************************************************************