BYTE *pbMemory;
DWORD dwMemsize;
DWORD dwCurPos;
+
+ CRITICAL_SECTION lock; /* must be held when pbMemory or dwCurPos is accessed */
} StreamOnMemory;
static HRESULT WINAPI StreamOnMemory_QueryInterface(IStream *iface,
TRACE("(%p) refcount=%u\n", iface, ref);
if (ref == 0) {
+ This->lock.DebugInfo->Spare[0] = 0;
+ DeleteCriticalSection(&This->lock);
HeapFree(GetProcessHeap(), 0, This);
}
return ref;
if (!pv) return E_INVALIDARG;
+ EnterCriticalSection(&This->lock);
uBytesRead = min(cb, This->dwMemsize - This->dwCurPos);
memcpy(pv, This->pbMemory + This->dwCurPos, uBytesRead);
This->dwCurPos += uBytesRead;
+ LeaveCriticalSection(&This->lock);
+
if (pcbRead) *pcbRead = uBytesRead;
return S_OK;
void const *pv, ULONG cb, ULONG *pcbWritten)
{
StreamOnMemory *This = (StreamOnMemory*)iface;
+ HRESULT hr;
TRACE("(%p)\n", This);
if (!pv) return E_INVALIDARG;
- if (cb > This->dwMemsize - This->dwCurPos) return STG_E_MEDIUMFULL;
- if (cb) {
+ EnterCriticalSection(&This->lock);
+ if (cb > This->dwMemsize - This->dwCurPos) {
+ hr = STG_E_MEDIUMFULL;
+ }
+ else {
memcpy(This->pbMemory + This->dwCurPos, pv, cb);
This->dwCurPos += cb;
+ hr = S_OK;
+ if (pcbWritten) *pcbWritten = cb;
}
- if (pcbWritten) *pcbWritten = cb;
+ LeaveCriticalSection(&This->lock);
- return S_OK;
+ return hr;
}
static HRESULT WINAPI StreamOnMemory_Seek(IStream *iface,
{
StreamOnMemory *This = (StreamOnMemory*)iface;
LARGE_INTEGER NewPosition;
+ HRESULT hr=S_OK;
TRACE("(%p)\n", This);
+ EnterCriticalSection(&This->lock);
if (dwOrigin == STREAM_SEEK_SET) NewPosition.QuadPart = dlibMove.QuadPart;
else if (dwOrigin == STREAM_SEEK_CUR) NewPosition.QuadPart = This->dwCurPos + dlibMove.QuadPart;
else if (dwOrigin == STREAM_SEEK_END) NewPosition.QuadPart = This->dwMemsize + dlibMove.QuadPart;
- else return E_INVALIDARG;
+ else hr = E_INVALIDARG;
- if (NewPosition.u.HighPart) return HRESULT_FROM_WIN32(ERROR_ARITHMETIC_OVERFLOW);
- if (NewPosition.QuadPart > This->dwMemsize) return E_INVALIDARG;
- if (NewPosition.QuadPart < 0) return E_INVALIDARG;
- This->dwCurPos = NewPosition.u.LowPart;
+ if (SUCCEEDED(hr)) {
+ if (NewPosition.u.HighPart) hr = HRESULT_FROM_WIN32(ERROR_ARITHMETIC_OVERFLOW);
+ else if (NewPosition.QuadPart > This->dwMemsize) hr = E_INVALIDARG;
+ else if (NewPosition.QuadPart < 0) hr = E_INVALIDARG;
+ }
- if(plibNewPosition) plibNewPosition->QuadPart = This->dwCurPos;
- return S_OK;
+ if (SUCCEEDED(hr)) {
+ This->dwCurPos = NewPosition.u.LowPart;
+
+ if(plibNewPosition) plibNewPosition->QuadPart = This->dwCurPos;
+ }
+ LeaveCriticalSection(&This->lock);
+
+ return hr;
}
/* SetSize isn't implemented in the native windowscodecs DLL either */
pObject->pbMemory = pbBuffer;
pObject->dwMemsize = cbBufferSize;
pObject->dwCurPos = 0;
+ InitializeCriticalSection(&pObject->lock);
+ pObject->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": StreamOnMemory.lock");
+
+ if (InterlockedCompareExchangePointer((void**)&This->pStream, pObject, NULL))
+ {
+ /* Some other thread set the stream first. */
+ IStream_Release((IStream*)pObject);
+ return WINCODEC_ERR_WRONGSTATE;
+ }
- This->pStream = (IStream*)pObject;
return S_OK;
}