static inline HRESULT writeroutput_query_for_stream(xmlwriteroutput *writeroutput)
{
HRESULT hr;
writeroutput_release_stream(writeroutput);
hr = IUnknown_QueryInterface(writeroutput->output, &IID_IStream, (void**)&writeroutput->stream);
if (hr != S_OK)
hr = IUnknown_QueryInterface(writeroutput->output, &IID_ISequentialStream, (void**)&writeroutput->stream);
return hr;
}
/*** IXmlWriter methods ***/
static HRESULT WINAPI xmlwriter_SetOutput(IXmlWriter *iface, IUnknown *output)
{
xmlwriter *This = impl_from_IXmlWriter(iface);
IXmlWriterOutput *writeroutput;
HRESULT hr;
TRACE("(%p)->(%p)\n", This, output);
if (This->output) {
writeroutput_release_stream(This->output);
IUnknown_Release(&This->output->IXmlWriterOutput_iface);
This->output = NULL;
This->bomwritten = FALSE;
This->indent_level = 0;
}
/* just reset current output */
if (!output) {
This->state = XmlWriterState_Initial;
return S_OK;
}
/* now try IXmlWriterOutput, ISequentialStream, IStream */
hr = IUnknown_QueryInterface(output, &IID_IXmlWriterOutput, (void**)&writeroutput);
if (hr == S_OK) {
if (writeroutput->lpVtbl == &xmlwriteroutputvtbl)
This->output = impl_from_IXmlWriterOutput(writeroutput);
else {
ERR("got external IXmlWriterOutput implementation: %p, vtbl=%p\n",
writeroutput, writeroutput->lpVtbl);
IUnknown_Release(writeroutput);
return E_FAIL;
}
}
if (hr != S_OK || !writeroutput) {
/* create IXmlWriterOutput basing on supplied interface */
hr = CreateXmlWriterOutputWithEncodingName(output, This->imalloc, NULL, &writeroutput);
if (hr != S_OK) return hr;
This->output = impl_from_IXmlWriterOutput(writeroutput);
}
This->state = XmlWriterState_Ready;
return writeroutput_query_for_stream(This->output);
}